WO2024199088A1

WO2024199088A1 - Communication method and communication apparatus

Info

Publication number: WO2024199088A1
Application number: PCT/CN2024/083111
Authority: WO
Inventors: 刘显达; 刘鹍鹏; 蔡世杰
Original assignee: 华为技术有限公司
Priority date: 2023-03-27
Filing date: 2024-03-21
Publication date: 2024-10-03
Also published as: CN118714646A

Abstract

Disclosed in the present application are a communication method and a communication apparatus. The method comprises: a terminal device receiving indication information, wherein the indication information is used for indicating an activated CORESET, and the activated CORESET is a part or all of a configured CORESET. The terminal device performs blind detection on a PDCCH candidate associated with the activated CORESET. By means the present invention, a network device can adaptively adjust the number of symbols of the PDCCH blindly detected by the terminal device, so that the number of the PDCCH candidates for blind detection of PDCCH by the terminal device in a time unit is increased, thereby improving flexibility of PDCCH scheduling by the network device.

Description

A communication method and a communication device

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on March 27, 2023, with application number 202310307999.3 and application name “A communication method and communication device”, the entire contents of which are incorporated by reference in this application.

Technical Field

The present application relates to the field of mobile communication technology, and in particular to a communication method and a communication device.

Background Art

The physical downlink control channel (PDCCH) is used to carry the downlink control information (DCI) sent by the network device to the terminal device. The DCI sent by the network device will be on certain specific resources. The terminal device can know the location of the resource pool where the DCI is located. The actual resource location of the DCI needs to be determined by the terminal device through blind detection of the PDCCH carrying the DCI.

The terminal device performs blind detection on the PDCCH candidates associated with the set of physical resources carrying the DCI (i.e., the control resource set (CORESET)). For a CORESET, the number of symbols occupied by the PDCCH candidates associated with the CORESET can be independently configured. The network device configures the number of PDCCH symbols that the terminal device blindly detects. If the blind detection capability of the terminal device can detect more symbols than the configured number of symbols, then the actual blind detection capability of the terminal device is not used and the flexibility of PDCCH scheduling is low.

Summary of the invention

The present application provides a communication method and a communication device for improving the flexibility of PDCCH scheduling.

To achieve the above objectives, the embodiments of the present application provide the following solutions.

In a first aspect, an embodiment of the present application provides a communication method that can be performed by a first communication device, which may be a communication device or a communication device that can support the communication device to implement the functions required for the method, such as a chip system. The first communication device may be a terminal device or a unit or functional module inside the terminal device. For example, the first communication device is a chip set in the terminal device, or the first communication device is other components for implementing the functions of the terminal device. The method provided in the first aspect is described below by taking the first communication device as the terminal device itself as an example.

The communication method includes: a terminal device receives indication information, the indication information is used to indicate an activated CORESET, the activated CORESET is a part or all of the configured CORESETs, and the terminal device performs blind detection on a PDCCH candidate associated with the activated CORESET.

In an embodiment of the present application, the network device may indicate the activated CORESET to the terminal device. For example, the activated CORESET is a part or all of the configured CORESET. For example, the number of symbols occupied by the activated CORESET is less than or equal to the number of symbols occupied by the configured CORESET. The number of symbols occupied by the activated CORESET is also the number of symbols of the PDCCH blindly detected by the terminal device. Through this solution, the network device can adaptively adjust the number of PDCCH symbols blindly detected by the terminal device. Compared with different CORESET configurations with different PDCCH symbol numbers, the flexibility of the network device in scheduling the PDCCH can be improved, and the probability of failure of PDCCH scheduling can be reduced.

In a possible implementation, the indication information is used to indicate the activated CORESET, including: the indication information indicates the number of symbols N, where N is a positive integer. The symbols occupied by the activated CORESET are located within N symbols starting from the first position, and the first position is the starting position of the time slot where the indication information is located, or the first position is the time domain starting position of the indication information. N is the number of symbols of the PDCCH blindly detected by the terminal device, for example, N is 1 or 2 or 3. This scheme indicates the number of symbols of the blindly detected PDCCH to the terminal device by indicating N, thereby indirectly indicating the activated CORESET. Compared with configuring different numbers of PDCCH symbols for different CORESETs, it is more flexible.

In a possible implementation, the indication information is used to implicitly indicate the activated CORESET.

In a possible implementation, the activated CORESET takes effect at the first time unit. Exemplarily, the first time unit may be the time slot where the indication information is located, or the subframe where the indication information is located, or the frame where the indication information is located. Optionally, the first time unit may also be from The indication information starts from a plurality of time slots, subframes or frames. Further, the first time unit may also be a time period from the start of the indication information to the start of receiving the next indication information.

In a possible implementation, the time domain starting positions of the activated CORESETs are the same.

In a possible implementation, the indication information is DCI, the CORESET associated with the DCI occupies 1 symbol in the time domain, and the starting position of the DCI is the first symbol of the time slot where the DCI is located. Since the CORESET associated with the DCI occupies 1 symbol in the time domain, and the starting position of the DCI is the first symbol of the time slot where the DCI is located, the time domain position of the activated CORESET can be determined as early as possible, reducing the delay of subsequent blind detection of PDCCH.

In a possible implementation, the activated CORESET includes a first COEREST and a second COEREST, wherein the first COEREST is a CORESET associated with the indication information, and the number of symbols occupied by the second COEREST in the time domain is the N. Among them, the configured CORESET includes multiple CORESETs occupying different numbers of symbols. By configuring CORESETs occupying different numbers of symbols, this scheme enables the terminal device to blindly detect all PDCCH candidates associated with the CORESET of the corresponding number of symbols (i.e., N), so that the terminal device can blindly detect the most PDCCH candidates within the scope of blind detection capability, thereby improving the flexibility of scheduling PDCCH.

In a possible implementation, the activated CORESET includes the first CORESET and at least two CORESETs. The first CORESET is a CORESET associated with the indication information, and the number of symbols occupied by the at least two CORESETs in the time domain is less than or equal to N. The number of symbols occupied by the CORESET blindly detected by the terminal device may be more, for example, greater than N.

In a possible implementation, there are multiple CORESETs with different associated PDCCH candidate detection priorities in the activated CORESETs. It should be understood that the detection priority is used to determine whether to discard some PDCCH candidates with low detection priority when the number of PDCCH candidates to be detected exceeds the maximum number of PDCCH candidates that the terminal device can support.

In a possible implementation manner, the detection priority of the PDCCH candidates is determined according to the number of OFDM symbols of the CORESET.

In another possible implementation manner, the configuration information of each CORESET carries first indication information, where the first indication information is used to indicate the detection priority of the PDCCH candidates associated with the CORESET.

In a possible implementation, at least two CORESETs include a third CORESET and a fourth CORESET, the detection priority of the PDCCH candidates associated with the third CORESET is higher than the detection priority of the PDCCH candidates associated with the fourth CORESET, and the number of symbols occupied by the third CORESET in the time domain is greater than the number of symbols occupied by the fourth CORESET in the time domain. In this scheme, by configuring the detection priority of the PDCCH candidates associated with the CORESET, it can be ensured that the terminal device detects PDCCH candidates with a specific number of symbols, so that the terminal device can blindly detect the most PDCCH candidates within the scope of blind detection capability, thereby improving the flexibility of scheduling PDCCH. In a possible implementation, the number of PDCCH candidates associated with the activated CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect; or, the number of PDCCH candidates associated with the configured CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect.

In a possible implementation, the control channel elements (CCE) corresponding to multiple CORESETs occupying different numbers of symbols are non-overlapping CCEs if the following conditions are met: the transmission configuration indication (TCI), reference signal scrambling code and physical resource group (PRG) configurations associated with the multiple CORESETs are the same. In this scheme, the CCEs corresponding to the CORESETs occupying different numbers of symbols are recorded as a non-overlapping CCE. Even if the terminal device blindly detects multiple CORESETs overlapping in the time domain at the same time, the number of detectable CCEs can be fully utilized.

In a second aspect, an embodiment of the present application provides a communication method that can be performed by a second communication device, which can be a communication device or a communication device that can support the communication device to implement the functions required for the method, such as a chip system. The second communication device can be a network device or a unit or functional module inside the network device. For example, the first communication device is a chip set in the network device, or the second communication device is other components for implementing the functions of the network device. The method provided in the second aspect is described below by taking the second communication device as the network device itself as an example.

The communication method includes: a network device generates indication information and sends the indication information. The indication information is used to indicate an activated CORESET, and the activated CORESET is a part or all of the configured CORESETs.

In a possible implementation, the indication information is used to indicate an activated CORESET, including: the indication information indicates the number of symbols N, where N is a positive integer. The symbols occupied by the activated CORESET are located within N symbols starting from a first position, and the first position is the starting position of the time slot where the indication information is located, or the first position is the time domain starting position of the indication information.

In a possible implementation, the indication information is DCI, the CORESET associated with the DCI occupies 1 symbol in the time domain, and the starting position of the DCI is the first symbol of the time slot.

In a possible implementation, the activated CORESET includes a CORESET associated with the indication information and a second CORESET, the number of symbols occupied by the first CORESET in the time domain is the N, wherein the configured CORESET includes multiple CORESETs occupying different numbers of symbols. CORESET.

In a possible implementation, the activated CORESET includes the CORESET associated with the indication information and at least two CORESETs, and the number of symbols respectively occupied by the at least two CORESETs in the time domain is less than or equal to N.

In a possible implementation, the at least two CORESETs include a third CORESET and a fourth CORESET, the detection priority of the PDCCH candidates associated with the third CORESET is higher than the detection priority of the PDCCH candidates associated with the fourth CORESET, and the number of symbols occupied by the third CORESET in the time domain is greater than the number of symbols occupied by the fourth CORESET in the time domain.

In a possible implementation, the number of PDCCH candidates associated with the activated CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect; or the number of PDCCH candidates associated with the configured CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect.

In a possible implementation, the following conditions are met, and the CCEs corresponding to multiple CORESETs occupying different numbers of symbols are non-overlapping CCEs: the TCIs, reference signal scrambling codes, and PRG configurations associated with the multiple CORESETs are the same.

Regarding the technical effects brought about by the second aspect and its possible methods, reference may be made to the introduction of the technical effects of the corresponding implementation methods of the first aspect.

In a third aspect, an embodiment of the present application provides a communication method, which can be executed by both ends of the communication. The two ends of the communication can be a transmitting end and a receiving end, or internal units of the transmitting end and the receiving end, or an internal unit of the transmitting end and the receiving end, or an internal unit of the transmitting end and an internal unit of the receiving end. The internal unit of the transmitting end can be a chip or a functional module arranged at the transmitting end. The internal unit of the receiving end can be a chip or a functional module arranged at the receiving end. For the convenience of description, the method provided in the third aspect is described below by taking the transmitting end as the network device itself and the receiving end as the terminal device as an example.

Network device indication information, where the indication information is used to indicate an activated CORESET, where the activated CORESET is a part or all of the configured CORESETs;

The terminal device receives the indication information and performs blind detection on the PDCCH candidates associated with the activated CORESET.

In a fourth aspect, an embodiment of the present application provides a communication device, wherein the communication device has the function of implementing the behavior in the method instance of any aspect of the first aspect to the second aspect above, and the beneficial effects can be found in the description of the first aspect to the second aspect and will not be repeated here. For example, the communication device may be the first communication device in the first aspect, such as a terminal device. Alternatively, the communication device may be a device that can support the terminal device in the first aspect to implement the functions required by the method provided in the first aspect, such as a chip or a chip system. For another example, the communication device may also be the second communication device in the second aspect, such as a network device. Alternatively, the communication device may be a device that can support the network device in the second aspect to implement the functions required by the method provided in the first aspect, such as a chip or a chip system.

In one possible design, the communication device includes corresponding means or modules for executing the method of any aspect of the first aspect to the second aspect. For example, the communication device includes a processing unit (sometimes also referred to as a processing module or processor) and/or a transceiver unit (sometimes also referred to as a transceiver module or transceiver). These units (modules) can perform the corresponding functions in the method examples of any aspect of the first aspect to the second aspect above, and refer to the detailed description in the method examples for details, which will not be repeated here.

In a fifth aspect, an embodiment of the present application provides a communication device, which may be the communication device in the fourth aspect of the above embodiment, or a chip or chip system arranged in the communication device in the fourth aspect. The communication device includes a communication interface and a processor, and optionally, also includes a memory. The memory is used to store computer programs or instructions or data, and the processor is coupled to the memory and the communication interface. When the processor reads the computer program or instructions or data, the communication device executes the method performed by the network device or terminal device in the above method embodiment.

In a sixth aspect, an embodiment of the present application provides a communication device, the communication device comprising an input/output interface and a logic circuit. The input/output interface is used to input and/or output information. The logic circuit is used to execute the method described in any one of the first aspect to the second aspect.

In a seventh aspect, an embodiment of the present application provides a chip system, which includes a processor and may also include a memory and/or a communication interface, for implementing the method described in any of the first to second aspects. In a possible implementation, the chip system also includes a memory for storing a computer program. The chip system may be composed of a chip, or may include a chip and other discrete devices.

In an eighth aspect, an embodiment of the present application provides a communication system, wherein the communication system comprises the communication device for implementing the function of the first aspect in the fourth aspect and the communication device for implementing the function of the second aspect in the fourth aspect.

In a ninth aspect, the present application provides a computer-readable storage medium storing a computer program, which, when executed, implements the method in any of the first to second aspects described above.

In a tenth aspect, a computer program product is provided, the computer program product comprising: a computer program code, when the computer program code is run, the method in any of the above-mentioned first to second aspects is executed.

The beneficial effects of the fourth to tenth aspects and their implementations can refer to the description of the beneficial effects of the first to second aspects, or the first to second aspects and their implementations.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a network architecture applicable to an embodiment of the present application;

FIG2 is a schematic diagram of the configuration of a CORESET provided in an embodiment of the present application;

FIG3 is a schematic diagram of a CCE configuration provided in an embodiment of the present application;

FIG4 is a schematic diagram of an association between CORESET and SSS provided in an embodiment of the present application;

FIG5 is a schematic diagram of resources corresponding to DCCH candidates provided in an embodiment of the present application;

FIG6 is a schematic diagram of the blind detection capability used by a terminal device under different PDCCH symbols provided in an embodiment of the present application;

FIG7 is a schematic diagram of a flow chart of a communication method provided in an embodiment of the present application;

FIG8 is a schematic diagram of a CORESET with different numbers of DCI symbols associated with it according to an embodiment of the present application;

FIG9 is a schematic diagram of a PDCCH candidate priority detection according to an embodiment of the present application;

FIG10 is a schematic diagram of a structure of a communication device provided in an embodiment of the present application;

FIG. 11 is another schematic diagram of the structure of a communication device provided in an embodiment of the present application.

DETAILED DESCRIPTION

The technical solution provided by the embodiments of the present application can be applied to the fifth generation (5G) mobile communication system, or to the long term evolution (LTE) system, or can also be applied to the next generation mobile communication system, such as the 6G mobile communication system or other similar communication systems. Other similar communication systems include, for example, vehicle to everything (V2X), machine type communications (MTC), machine to machine (M2M), Internet of things (IoT) system or narrowband Internet of things (NB-IoT) system. IoT can be understood as IoT or wearable WiFi network based on wireless fidelity (WiFi). Wearable WiFi network refers to a WiFi network composed of a terminal device (such as a mobile phone) as a virtual access point and associated wearable devices.

FIG. 1 shows an exemplary architecture diagram of a communication system applicable to an embodiment of the present application, and the communication system may include a network device and at least one terminal device. As shown in FIG. 1, two terminal devices are taken as an example. The two terminal devices may be mobile terminal devices and/or any other suitable devices for communicating on a wireless communication system, and both may be wirelessly connected to the network device. Both terminal devices are capable of communicating with the network device. It should be noted that the number of terminal devices in FIG. 1 is only an example, and may be less or more. FIG. 1 is only a schematic diagram, and the communication system applicable to the embodiment of the present application may also include other devices, such as a core network device. The terminal device is connected to the network device wirelessly, and the network device is connected to the core network device wirelessly or wired. The core network device and the network device may be independent and different physical devices; or the functions of the core network device and the logical functions of the network device are integrated on the same physical device; or the functions of part of the core network device and the functions of part of the network device are integrated on the same physical device.

Network equipment is an access device for terminal equipment to access the mobile communication system wirelessly, including radio access network (RAN) equipment, such as base stations. Network equipment can also refer to equipment that communicates with terminal equipment at the air interface. Network equipment may include an evolved Node B in a long-term evolution LTE system or an advanced long-term evolution (LTE-A), which can be referred to as eNB or e-NodeB for short). eNB is a device deployed in a wireless access network that meets 4G standards and provides wireless communication functions for terminal equipment. The network device may also be a new radio controller (NR controller), a gNode B (gNB) in a 5G system, a centralized unit, a new wireless base station, a radio frequency remote module, a micro base station (also called a small station), a relay, a distributed unit, various forms of macro base stations, a transmission reception point (TRP), a transmission measurement function (TMF) or a transmission point (TP) or any other wireless access device, but the embodiments of the present application are not limited thereto. The network equipment may also include a radio network controller (RNC), a Node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (e.g., home evolved NodeB, or home Node B, HNB), a base band unit (BBU) or a remote radio unit (RRU), or a Wifi access point (AP), or a baseband pool (BBU pool) and RRU in a cloud radio access network (CRAN). The embodiments of the present application do not limit the specific technology and specific device form used by the network equipment. The network equipment may correspond to an eNB in a 4G system and to an eNB in a 5G system. Corresponding to gNB in the system.

In addition, the base station in the embodiment of the present application may include a centralized unit (CU) and a distributed unit (DU), and multiple DUs may be centrally controlled by one CU. CU and DU may be divided according to the protocol layer functions of the wireless network they possess, for example, the functions of the packet data convergence protocol (PDCP) layer and the protocol layers above are set in the CU, and the functions of the protocol layers below the PDCP, such as the radio link control (RLC) layer and the medium access control (MAC) layer, are set in the DU. It should be noted that this division of the protocol layer is only an example, and it can also be divided in other protocol layers. The radio frequency device can be remote and not placed in the DU, or it can be integrated in the DU, or part of it can be remote and part of it can be integrated in the DU, and the embodiment of the present application does not impose any restrictions. In addition, in some embodiments, the control plane (CP) and the user plane (UP) of the CU can also be separated and divided into different entities for implementation, namely the control plane CU entity (CU-CP entity) and the user plane CU entity (CU-UP entity). In this network architecture, the signaling generated by the CU can be sent to the terminal device through the DU, or the signaling generated by the UE can be sent to the CU through the DU. The DU can directly encapsulate the signaling through the protocol layer and transparently transmit it to the terminal device or CU without parsing it. In this network architecture, the CU is divided into a network device on the RAN side. In addition, the CU can also be divided as a network device on the core network (CN) side, and this application does not limit this.

In the embodiment of the present application, the network device is a device that can be used to implement the function of the network device, or it can be a device that can support the network device to implement the function, such as a chip system, which can be installed in the network device. The chip system can be composed of chips, or it can include chips and other discrete devices. In the embodiment of the present application, the technical solution provided by the embodiment of the present application is described by taking the device for implementing the function of the network device as the network device itself as an example.

Terminal equipment, also called terminal or terminal device, has wireless transceiver function and can send signals to network equipment or receive signals from network equipment. For example, terminal equipment includes user equipment (UE), access station, UE station, remote station, wireless communication equipment, or user device, chip, etc. The terminal device is used to connect people, objects, machines, etc., and can be widely used in various scenarios, such as including but not limited to the following scenarios: cellular communication, device-to-device communication (D2D), vehicle to everything (V2X), machine-to-machine/machine-type communications (M2M/MTC), IoT, virtual reality (VR), augmented reality (AR), industrial control, self driving, remote medical, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, drones, robots and other scenarios.

For example, the terminal device in the embodiment of the present application can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a VR terminal, an AR terminal, a wireless terminal in industrial control, a whole vehicle, a wireless communication module in the whole vehicle, a vehicle-mounted T-box (Telematics BOX), RSU, a wireless terminal in unmanned driving, a smart speaker in an IoT network, a wireless terminal device in telemedicine, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, or a wireless terminal device in a smart home, etc. As an example and not a limitation, in the embodiment of the present application, the terminal device can also be a wearable device. Wearable devices can also be called wearable smart devices or smart wearable devices, etc., which are a general term for the intelligent design of daily wearables using wearable technology and the development of wearable devices, such as glasses, gloves, watches, clothing and shoes.

The terminal device may also include a relay. Or it can be understood that anything that can communicate data with a base station can be considered a terminal device. The various terminal devices introduced above, if located on a vehicle (for example, placed in a vehicle or installed in a vehicle), can be considered as vehicle-mounted terminal devices, and vehicle-mounted terminal devices are also called on-board units (OBU). The terminal device of the present application may also be an on-board module, on-board module, on-board component, on-board chip or on-board unit built into the vehicle as one or more components or units. The vehicle can implement the method of the present application through the built-in on-board module, on-board module, on-board component, on-board chip or on-board unit.

In the embodiment of the present application, the terminal device is a device that can be used to implement the function of the terminal device, or it can be a device that can support the terminal device to implement the function, such as a chip system, which can be installed in the terminal device. For example, the terminal device can also be a vehicle detector. The chip system can be composed of chips, or it can include chips and other discrete devices. In the embodiment of the present application, the technical solution provided by the embodiment of the present application is described by taking the device for implementing the function of the terminal device as the terminal device itself as an example.

The embodiments of the present application involve blind detection of DCI, and blind detection of DCI is blind detection of PDCCH carrying DCI. To facilitate understanding of the technical solutions involved in the embodiments of the present application, firstly, a brief introduction is given to the relevant concepts and terms involved in the embodiments of the present application.

1) DCI blind detection, DCI is carried on the physical downlink control channel (PDCCH) sent by the network device to the terminal device. DCI can indicate the transmission parameters of the information to be sent by the network device to the terminal device, such as resource information. The DCI sent by the network device will be on certain specific resources. What the terminal device can know is the location of the resource pool where the DCI is located. The resource location where the DCI is actually sent needs to be determined by the terminal device blindly detecting the PDCCH carrying the DCI. DCI blind detection refers to performing DCI detection, channel estimation, and translation according to the DCI format and scrambling method on specific resources within a certain physical resource according to preset rules. In the embodiment of the present application, blind detection of DCI and blind detection of PDCCH can be replaced with each other.

2) Control resource set (CORESET), which is a set of physical resources that can be used to carry DCI. The terminal device can perform multiple blind detections of DCI within the CORESET configured by the network device to determine the actual resource location that carries the DCI.

The number of time domain symbols occupied by PDCCH in the time domain can be 1, 2 or 3. CORESET can occupy 1, 2 or 3 consecutive symbols in the time domain. The number of resource blocks (RBs) occupied by CORESET in the frequency domain is an integer multiple of 6, and the RBs occupied by CORESET can be indicated by a bitmap. CORESET is a resource within a continuous frequency domain resource. In the embodiment of the present application, a continuous frequency domain resource is also called a bandwidth part (BWP). For example, please refer to Figure 2, which is a configuration diagram of CORESET. In (a) of Figure 2, BWP (i.e., BWP1) occupies 18 RBs (i.e., RB0 to RB17) as an example. If the network device configures a CORESET including 12 RBs, the network device can indicate the RBs occupied by CORESET through 3 bits. For example, the first bit is used to indicate whether CORESET occupies RB0 to RB5, the second bit is used to indicate whether CORESET occupies RB5 to RB11, and the third bit is used to indicate whether CORESET occupies RB12 to RB17. For example, the value of the 3 bits is "110", indicating that CORESET1 occupies the first 12 RBs, namely RB0 to RB11.

It should be noted that (a) in FIG. 2 takes the case where the index of the first RB included in BWP1 is the same as the start index of the common resource block (CRB) as an example. The index of the first RB included in a BWP is also the start index of the BWP. In a possible scenario, the start index of the BWP configured by the network device for the terminal device may be offset from the start index of the CRB. In this case, the terminal device should also consider the offset when determining the CORESET configured by the network device. As shown in (b) in FIG. 2, the start index of the CRB is 0, and the offset between the start index of the BWP2 configured by the network device for the terminal device and the start index of the CRB is 5. Assuming that the CORESET configured by the network device for the terminal device occupies RB1' to RB6' in BWP2, the network device can indicate the RBs occupied by the CORESET through 46 bits. For example, these 46 bits are used to indicate whether the CORESET occupies RB6 to RB11. For example, if the value of the 46 bits is "010000....", it indicates that the CORESET occupies RB6 to RB11. Since the offset between the start index of BWP2 and the start index of CRB is 5, for the terminal device, CORESET2 can be determined as RB1' to RB6' in BWP2 based on the offset of 5 and RB6 to RB11 in CRB.

The network device may configure different CORESET identifiers for each CORESET in advance, so as to distinguish different CORESETs according to different CORESET identifiers. For example, taking CORESET including CORESET1 and CORESET2 as an example, the CORESET identifier of CORESET1 may be set to p1, and the CORESET identifier of CORESET2 may be set to p2.

3) CCE, which is the basic unit of PDCCH. One PDCCH occupies one or more CCEs. One CCE includes multiple resource element groups (REGs). The number of REGs corresponding to one CCE can be fixed. For example, 4 or 6. One REG occupies S consecutive subcarriers in the frequency domain, and/or T consecutive time domain symbols in the time domain. Where S is a natural number greater than 1. For example, one REG can occupy 12 consecutive subcarriers in the frequency domain and 1 time domain symbol in the time domain, where S=12 and T=1. In the embodiments of the present application, the time domain symbol and the symbol have the same meaning, and unless otherwise specified, the two can be replaced. The symbols in the embodiments of the present application include but are not limited to orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbols, sparse code multiplexing access (sparse code multiplexing access, SCMA) symbols, filtered orthogonal frequency division multiplexing (filtered orthogonal frequency division multiplexing, F-OFDM) symbols, and non-orthogonal multiple access (Non-Orthogonal multiple access, NOMA) symbols. The specific symbols can be determined based on actual conditions and will not be elaborated here.

CCE can be determined based on the physical resources occupied by CORESET. For example, please refer to Figure 3, which is a schematic diagram of CCE configuration. Figure 3 takes the example that CORESET occupies 24 RBs in the frequency domain and 1 OFDM symbol in the time domain. The CORESET shown in Figure 3 can be divided into 4 CCEs, and each CCE includes 6 consecutive REGs. These 4 are CCE0 to CCE3. Figure 3 takes the example that CORESET can be divided into 4 CCEs in a non-interleaved mapping manner. It is also possible to combine multiple non-continuous REGs into one CCE in an interleaved manner.

New radio (NR) defines the maximum number of non-overlapping CCEs that a UE can monitor in a timeslot. For example, Table 1 shows the maximum number of non-overlapping CCEs that a terminal device can monitor in a timeslot for different subcarrier spacings defined in NR release (Rel)-15.

Table 1

4) AL, which represents the number of time-frequency resources occupied by a PDCCH candidate. The value of AL is the number of CCEs used by a PDCCH. Quantity. The number of candidate PDCCHs for each aggregation level can be used to indicate the number of candidate positions where PDCCH may be sent with the current aggregation level. For example, taking the number of PDCCHs configured with aggregation level AL=2 as 4 as an example, it can be determined that the network device may send PDCCH at 4 PDCCH candidate positions, and the aggregation level of PDCCH at each candidate position is 2, that is, each candidate PDCCH occupies 2 CCEs. In the NR system, the candidate values of AL can be: {1,2,4,8,16}. Different PDCCH candidates can correspond to different AL values, thereby improving the scheduling flexibility of network devices. For example, when the transmission channel conditions are poor, the network device can use the PDCCH candidate corresponding to the larger AL value to send DCI to increase the reliability of DCI transmission. Conversely, the network device can use the PDCCH candidate corresponding to the smaller AL value to send DCI to save signaling overhead.

5) Search space set (SSS/SS set), which can be used to specify the blind detection behavior of the terminal device. Each search space set can be associated with a CORESET. The terminal device blindly detects DCI in the CORESET associated with the SSS. Each search space set is used to indicate the time domain location of the PDCCH. The configuration information of the search space set may include: the identifier of the SSS, the CORESET associated with the SSS, the monitoring occasion, or the aggregation level (AL). Among them, the identifier of the SSS is used to characterize the SSS. The SSS can specify the behavior of the terminal device to detect DCI. The terminal device can blindly detect DCI in the CORESET associated with the SSS according to the detection behavior defined by the SSS.

The detection timing is used by the terminal device to determine the moment of blind detection of DCI. The network device can indicate the moment of blind detection of DCI to the terminal device by configuring the detection period, offset and symbol position of SSS. For example, refer to Figure 4, which shows a schematic diagram of the association of CORESET and SSS. Figure 4 takes SSS1 and SSS2 associating CORESET1, and SSS3 associating CORESET2 as an example. The terminal device can determine the frequency domain position of detecting DCI according to the configuration information of CORESET1 at the DCI detection timing determined by SSS1 and SSS2 respectively, and determine the frequency domain position of detecting DCI according to the configuration information of CORESET2 at the DCI detection timing determined by SSS3.

6) PDCCH candidates are the basic granularity of DCI blind detection by terminal devices. Terminal devices need to detect PDCCH candidates for blind detection of DCI. One PDCCH candidate corresponds to one DCI blind detection or one DCI detection process (including operations such as parsing, decoding and judging information bits). The number of PDCCH candidates can represent the complexity of DCI detection by terminal devices or the overhead of DCI processing operations. Terminal devices with different capabilities can detect different maximum numbers of PDCCH candidates.

For example, Table 2 shows the maximum number of detected PDCCH candidates in a time slot and a serving cell for different subcarrier spacings.

Table 2

When the terminal device blindly detects DCI, it needs to determine the resources occupied by each PDCCH candidate under AL. For example, the terminal device can determine it based on the index value of the PDCCH candidate under AL, the CORESET associated with the SSS, the number of CCEs included in the CORESET, and other information. For example, please refer to Figure 5, which shows the resources corresponding to the PDCCH candidate. Figure 5 takes the CORESET including 8 CCEs as an example. Figure 5 shows the resource occupancy of the PDCCH candidates corresponding to AL=2 and AL=4 in the SSS associated with the CORESET on the CORESET. For example, AL=2, PDCCH candidate 1 occupies CCE0~CCE1, PDCCH candidate 2 occupies CCE2~CCE3, and PDCCH candidate 3 occupies CCE6~CCE7. For another example, PDCCH candidate 1 occupies CCE0~CCE3, and PDCCH candidate 2 occupies CCE4~CCE7.

7) Subcarrier: A subcarrier is the smallest granularity in the frequency domain. For example, in LTE, the subcarrier width of a subcarrier, also known as the subcarrier spacing, is 15kHz; in 5G, the subcarrier spacing may be 15kHz, 30kHz, 60kHz or 120kHz.

8) The terms "system" and "network" in the embodiments of the present application can be used interchangeably. In the embodiments of the present application, "multiple" can also be understood as "at least two". "At least one" can be understood as one or more, for example, one, two or more. For example, including at least one means including one, two or more, and there is no restriction on which ones are included. For example, including at least one of A, B and C, then A, B, C, A and B, A and C, B and C, or A, B and C can be included. "And/or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/", unless otherwise specified, generally indicates that the previously associated objects are in an "or" relationship.

Unless otherwise specified, ordinal numbers such as "first" and "second" mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the order, timing, priority or importance of multiple objects. For example, the second CORESET and the third CORESET are only used to distinguish different CORESETs, but not to limit the functions, priorities or importance of the two CORESETs.

When performing PDCCH blind detection, the terminal device can determine multiple The PDCCH blind detection timing is determined, and PDCCH blind detection is performed based on the PDCCH blind detection timing. For example, for a CORESET, the number of symbols occupied by the PDCCH candidates associated with the CORESET can be independently configured. In an embodiment of the present application, the number of symbols occupied by the PDCCH candidates can be referred to as the number of PDCCH symbols. The terminal device can perform blind detection of the PDCCH according to the configured number of PDCCH symbols.

If the number of configured PDCCH symbols is large, the terminal device uses more blind detection capabilities, and the power consumption of the terminal device is also large; at the same time, the resources used for data transmission will be reduced, and accordingly, the system throughput will be low. If the number of configured PDCCH symbols is small, the terminal device uses less blind detection capabilities, and the number of candidate PDCCHs for PDCCH blind detection by the terminal device in the time unit will also be reduced. The terminal device cannot detect the PDCCH in time, and the probability of failure in scheduling the physical downlink shared channel (PDSCH) is also high.

Therefore, it is proposed that the number of PDCCH symbols can be adaptively adjusted. For example, the network device can configure different numbers of PDCCH symbols through different CORESETs, so as to achieve the purpose of dynamically adjusting the number of PDCCH symbols. For example, different traffic volumes can correspond to different CORESETs, and different CORESETs can configure different numbers of PDCCH symbols. In this way, the network device configures a matching CORESSET according to the traffic volume of the terminal device. When the traffic volume is large, the number of configured PDCCH symbols is large; when the traffic volume is small, the number of configured PDCCH symbols is small, so as to maximize the system throughput.

For example, the number of PDCCH symbols corresponding to CORESET1 is 1, the number of PDCCH symbols corresponding to CORESET2 is 2, and the number of PDCCH symbols corresponding to CORESET3 is 3. If the traffic volume is large, the network device can configure CORESET3 to the terminal device; when the traffic volume is small, the network device can configure CORESET1 to the terminal device. For the terminal device, the number of symbols to be blindly detected can be determined according to the number of PDCCH symbols corresponding to the configured CORESET. In this way, when the traffic volume is small, the network device configures fewer PDCCH symbols for the terminal device, which can leave more available transmission resources for data transmission, thereby improving the throughput of the system.

As mentioned above, the terminal device has a strong blind detection capability, and accordingly, the terminal device can detect a large number of CCEs and PDCCH candidates. If the terminal device can actually detect a large number of PDCCH symbols blindly, but the network device configures a small number of PDCCH symbols for the terminal device, the number of PDCCH symbols actually blindly detected by the terminal device is less than the maximum number of PDCCH symbols that the terminal device can detect. The fewer the number of PDCCH candidates detected by the terminal device, the lower the flexibility of PDCCH scheduling provided by the network device, and the higher the probability of PDCCH conflicts between terminal devices. The number of PDCCH symbols actually blindly detected by the terminal device is less than the maximum number of PDCCH symbols that the terminal device can detect. It can be understood that the blind detection capability of the terminal device is not fully used, and the PDCCH candidates actually blindly detected by the terminal device are also part of the configured PDCCH candidates, that is, not all PDCCH candidates are blindly detected.

For example, see FIG6 , which shows the blind detection capability used by the terminal device under different PDCCH symbols. CORESET occupies 3 symbols. When the number of PDCCH symbols is 1, PDCCH occupies 1 symbol, and the remaining 2 symbols can be used to transmit data channels, such as PDSCH. The terminal device actually performs blind detection on 1 symbol. If the terminal device can actually detect 3 symbols, then the terminal device still has 2 symbols of detection capability that are not used. Similarly, when the number of PDCCH symbols is 2, the remaining 1 symbol can be used to transmit data channels, such as PDSCH. The terminal device actually performs blind detection on 2 symbols. If the terminal device can actually detect 3 symbols, then the terminal device still has 1 symbol of detection capability that is not used. When the number of PDCCH symbols is 3, the terminal device actually performs blind detection on 3 symbols. If the terminal device can actually detect 3 symbols, then the detection capability of the terminal device is exhausted. It can be seen that by configuring different numbers of PDCCH symbols through different CORESETs, there is a problem of low flexibility in PDCCH scheduling and a high probability of failure in PDCCH scheduling.

In view of this, a solution of an embodiment of the present application is provided. In an embodiment of the present application, a network device may indicate an activated CORESET to a terminal device, that is, a CORESET that needs blind detection. The terminal device performs blind detection on the PDCCH candidate associated with the activated CORESET. The number of PDCCH symbols corresponding to the activated CORESET may be 1, 2, or 3, so as to match the blind detection capability of the terminal device as much as possible, while improving the system throughput, so that the number of candidate PDCCHs for PDCCH blind detection by the terminal device in a time unit is as large as possible, so that the terminal device can detect the PDCCH in time, improve the flexibility of the network device in scheduling the PDCCH, and reduce the probability of PDCCH conflicts between terminal devices.

The solution provided by the embodiments of the present application is described below in conjunction with the accompanying drawings.

Please refer to Figure 7, which is a flowchart of a communication method provided in an embodiment of the present application. Figure 7 introduces the method from the perspective of the interaction between a network device and a terminal device. In the embodiment shown in Figure 7, the steps performed by the network device can be implemented by the network device itself, or by components in the network device (such as chips, processing units, or processors and other modules). For example, the network device can be the network device in Figure 1, or it can be a chip (system) in the network device in Figure 1. The steps performed by the terminal device can be implemented by the terminal device itself, or by components in the terminal device (such as chips, processing units, or processors and other modules). The terminal device can be the terminal device shown in Figure 1, or it can be a chip (system) in the terminal device in Figure 1. As shown in Figure 7, the communication method provided in an embodiment of the present application The process of the letter method includes the following steps.

S701. A network device sends indication information to a terminal device. The indication information is used to indicate an activated resource control set (CORESET). The activated CORESET is a part or all of a configured CORESET.

S702. The terminal device performs blind detection on the PDCCH candidates associated with the activated CORESET.

The activated CORESET is the CORESET that the terminal device performs blind detection on, which can also be understood as the terminal device performing blind detection of the PDCCH in the activated CORESET. The network device can indicate the activated CORESET to the terminal device through signaling. For example, the network device sends indication information to the terminal device, and correspondingly, the terminal device receives the indication information, which can indicate the activated CORESET.

For example, the activated CORESET may be part or all of the CORESETs configured for the terminal device. Alternatively, the number of symbols occupied by the activated CORESET is less than or equal to the number of symbols occupied by the configured CORESET. The network device can schedule the PDCCH more flexibly by indicating the activated CORESET to the terminal device. For example, if the traffic volume is small, the number of symbols occupied by the activated CORESET can be adaptively reduced, for example, the number of symbols occupied by the activated CORESET is 1 or 2. This can leave more resources for transmitting PDSCH, thereby improving system throughput. Alternatively, the network device can also configure an activated CORESET for the terminal device according to the blind detection capability of the terminal device. The terminal device has a strong blind detection capability, and the number of symbols occupied by the activated CORESET can be adaptively increased, thereby increasing the number of candidate PDCCHs for the terminal device to perform PDCCH blind detection in the time unit. This can increase the flexibility of the network device in scheduling PDCCH, enable the terminal device to detect PDCCH in time, and reduce the probability of failure of the network device in scheduling PDSCH.

The network device can indicate the activated CORESET to the terminal device by indicating the number of PDCCH symbols to the terminal device. For example, the network device sends indication information to the terminal device, and the indication information indicates the number of PDCCH symbols, or the indication information indicates the activated CORESET. Exemplarily, the indication information may indicate the number of symbols N, for example, the indication information includes N, and N is a positive integer. The symbols occupied by the activated CORESET are within N symbols starting from the first position. The first position is the starting position of the time slot where the indication information is located, or the first position is the time domain starting position of the indication information. The terminal device receives the indication information and can determine the time domain position of the activated CORESET according to the first position, that is, N symbols starting from the first position.

The indication information may be carried in DCI or other possible signaling. The network device may use a block code with a code rate of 1/16 modulated by quadrature phase shift keying (QPSK) to send the indication information. The embodiment of the present application does not limit the implementation method of the indication information indicating the activated CORESET.

For example, the indication information includes first information with a length of 1 bit, and different values of the 1 bit indicate different sizes of N. For example, the value of the 1 bit is "0", indicating N=2; the value of the 1 bit is "1", indicating N=3. Alternatively, the value of the 1 bit is "1", indicating N=2; the value of the 1 bit is "0", indicating N=3. When the terminal device does not receive the indication information within the preset time length, N=1 may be defaulted. Alternatively, the value of the 1 bit is "0", indicating N=1; the value of the 1 bit is "1", indicating N=2. Alternatively, the value of the 1 bit is "1", indicating N=1; the value of the 1 bit is "0", indicating N=2. If the terminal device does not receive the indication information within the preset time length, N=3 may be defaulted.

For another example, the indication information includes first information of 2 bits in length, and different values of the 2 bits indicate different sizes of N. For example, the 2-bit value "00" indicates N=1, the 1-bit value "01" indicates N=2, and the 10-bit value "2" indicates N=3.

In an embodiment of the present application, the indication information is indication information shared by multiple terminal devices. It can be understood that the activated CORESET indicated by the network device is at the cell level, which is valid for multiple terminal devices in the cell, and multiple terminal devices in the cell can jointly detect the indication information. For example, the indication information may also include second information, which indicates that the indication information is shared, or indicates that the indication information can be shared by multiple terminal devices. For another example, the indication information may be a DCI in a fixed format, which indicates that the DCI is shared or shared by multiple terminal devices.

In a possible implementation, the indication information may implicitly indicate the activated CORESET. For example, the indication information may indicate that the activated CORESET is effective at the first time unit. The first time unit may be the time slot where the indication information is located, or the subframe where it is located, or the frame where it is located. Optionally, the first time unit may also be multiple time slots, subframes or frames starting from the indication information. Further, the first time unit may also be the time period from the start of the indication information to the start of receiving the next indication information. Optionally, the time domain starting positions of the activated CORESETs are the same.

In a possible implementation, the indication information is carried in DCI, and the CORESET associated with the DCI occupies 1 symbol in the time domain, and the starting position of the DCI is the first symbol of the time slot where the DCI is located. It can also be understood that the DCI is mapped in the first symbol of a time slot. Since the terminal device needs to detect the DCI, it can determine the activated CORESET, and then perform blind detection of PDCCH/DCI in the activated CORESET. When the CORESET associated with the DCI carrying the indication information occupies 1 symbol in the time domain, and the starting position of the DCI is the first symbol of the time slot where it is located, the time domain position of the activated CORESET can be determined as early as possible, which can reduce the subsequent Blind detection of PDCCH delay For the convenience of description, the embodiment of the present application refers to the CORESET associated with the DCI as the first CORESET.

For example, see Figure 8, which shows that the CORESET associated with the DCI occupies different numbers of symbols. (a) in Figure 8 takes 1 symbol occupied by the first CORESET in the time domain as an example, (b) in Figure 8 takes 2 symbols occupied by the first CORESET in the time domain as an example, and (c) in Figure 8 takes 1 symbol occupied by the first CORESET in the time domain as an example. It can be seen from (a) in Figure 8 that when the first CORESET occupies 1 symbol in the time domain, the terminal device can determine the time domain position of the activated CORESET before the second symbol, and the PDCCH can be blindly detected as early as the second symbol. Similarly, as shown in (b) in Figure 8, when the first CORESET occupies 2 symbols in the time domain, the terminal device can determine the time domain position of the activated CORESET before the third symbol, and the PDCCH can be blindly detected as early as the third symbol. As shown in (c) of FIG8 , when the first CORESET occupies 3 symbols in the time domain, the terminal device can determine the time domain position of the activated CORESET after the third symbol, and blind detection of PDCCH can be performed as early as after the third symbol.

Usually, the PDCCH candidates associated with each CORESET are preconfigured. If N is less than the number of symbols occupied by the CORESET in the time domain, the blind detection capability of the terminal device may not be exhausted. For example, CORESET1 is associated with PDCCH candidate 1. The CORESET occupies 3 symbols in the time domain, and PDCCH candidate 1 also occupies 3 symbols in the time domain. If the indication information indicates N=1, that is, the activated CORESET occupies 1 symbol in the time domain. The terminal device performs blind detection on PDCCH1 candidate 1 on 1 symbol, that is, the terminal device does not perform blind detection on the remaining 2 PDCCH candidates. The PDCCH candidates actually blindly detected by the terminal device are some of the PDCCH candidates associated with the CORESET, which will increase the probability of failure of the network device to schedule PDCCH.

To this end, in an embodiment of the present application, the network device can configure specific PDCCH candidates for the terminal device according to the configured number of PDCCH symbols (ie, N) to ensure that the terminal device can blindly detect more PDCCH candidates within the blind detection capability range as much as possible.

As a possible implementation, multiple CORESETs occupying different numbers of symbols may be preconfigured. The activated CORESETs include a first CORESET and a second CORESET, and the number of symbols occupied by the second CORESET in the time domain is N. The terminal device detects the CORESET corresponding to the number of symbols by default according to N. For example, CORESET1, CORESET2, and CORESET3 are preconfigured. CORESET1 occupies 1 symbol in the time domain, CORESET2 occupies 2 symbols in the time domain, and CORESET3 occupies 3 symbols in the time domain. When the terminal device determines that N=1 according to the indication information, the terminal device blindly detects CORESET1 by default. It can be understood that the terminal device also needs to blindly detect the CORESET associated with the indication information (for example, called CORESET0). That is, N=1, the terminal device performs blind detection in CORESET0 and CORESET1 by default. Similarly, N=2, the terminal device performs blind detection in CORESET0 and CORESET2 by default. N=3, the terminal device performs blind detection in CORESET0 and CORESET3 by default. It can be seen that by configuring CORESETs occupying different numbers of symbols, the terminal device can blindly detect the CORESETs with the corresponding number of symbols (i.e., N), or the terminal device can blindly detect all PDCCH candidates associated with the CORESET corresponding to N, so that the terminal device can blindly detect the most PDCCH candidates within the scope of blind detection capability, thereby improving the flexibility of scheduling PDCCH.

The number of PDCCH candidates associated with the activated CORESET may exceed the maximum number of PDCCH candidates that the terminal device can detect; or, the number of PDCCH candidates associated with the configured CORESET may exceed the maximum number of PDCCH candidates that the terminal device can detect. In this case, the priority of the PDCCH candidates associated with the CORESET that the terminal device blindly detects can be specified. For example, the terminal device gives priority to blindly detect the PDCCH candidates associated with the CORESET that occupies a large number of symbols. In this way, even if the number of PDCCH candidates configured by the network device exceeds the maximum number of PDCCH candidates that can be detected within the blind detection capability of the terminal device, the terminal device can blindly detect the most PDCCH candidates within the blind detection capability, thereby improving the flexibility of scheduling PDCCH.

For example, the activated CORESET includes a first CORESET and at least two CORESETs, and the number of symbols respectively occupied by the at least two CORESETs in the time domain is less than or equal to N. The at least two CORESETs include a third CORESET and a fourth CORESET, and the detection priority of the PDCCH candidate associated with the third CORESET is higher than the detection priority of the PDCCH candidate associated with the fourth CORESET. The number of symbols occupied by the third CORESET in the time domain is greater than the number of symbols occupied by the fourth CORESET in the time domain.

For example, see FIG9 , which shows a schematic diagram of PDCCH candidate priority detection. FIG9 takes CORESET1, CORESET2, CORESET3 and CORESET4 as an example. Among them, CORESET1 is a CORESET associated with the indication information, and occupies 1 symbol in the time domain. CORESET2 occupies 1 symbol in the time domain, CORESET3 occupies 2 symbols in the time domain, and CORESET4 occupies 3 symbols in the time domain.

When N=1, the activated CORESETs include CORESET1 and CORESET2. The terminal device performs blind detection in CORESET1 and CORESET2.

When N=2, the activated CORESETs include CORESET1, CORESET2, and CORESET3, that is, the terminal device performs blind detection in the PDCCH candidates associated with CORESET1, CORESET2, and CORESET3 by default. It can be agreed that the detection priority of the PDCCH candidates associated with CORESET3 is higher than the priority of the PDCCH candidates associated with CORESET2. In this case, the terminal The device preferentially performs blind detection on the PDCCH candidates associated with CORESET3, that is, the terminal device preferentially blindly detects the PDCCH candidates on 2 symbols, so that more PDCCH candidates can be detected within the blind detection capability of the terminal device.

When N=3, the activated CORESETs include CORESET1, CORESET2, CORESET3, and CORESET4, that is, the terminal device performs blind detection in the PDCCH candidates associated with CORESET1, CORESET2, CORESET3, and CORESET4 respectively by default. It can be agreed that the detection priority of the PDCCH candidates associated with CORESET4 is higher than the priority of the PDCCH candidates associated with CORESET2 and CORESET3. In this case, the terminal device gives priority to blind detection on the PDCCH candidates associated with CORESET4, that is, the terminal device gives priority to blind detection of PDCCH candidates on 3 symbols, so that more PDCCH candidates can be detected within the blind detection capability of the terminal device.

As can be seen from Figure 9, although the number of PDCCH candidates configured by the network device exceeds the maximum number of PDCCH candidates that can be detected within the blind detection capability of the terminal device, by configuring the detection priority of the PDCCH candidates associated with the CORESET, it can be ensured that the terminal device detects PDCCH candidates with a specific number of symbols, so that the terminal device can blindly detect the most PDCCH candidates within the blind detection capability, thereby improving the flexibility of scheduling PDCCH.

It should be noted that in the example shown in FIG. 9 , the terminal device is required to simultaneously detect multiple CORESETs that overlap in the time domain. The CCE that the terminal device can blindly detect is currently specified to be a CCE that blindly detects CCEs belonging to different CORESETs (i.e., non-overlapping CCEs). Therefore, if non-overlapping CCEs refer to CCEs belonging to different CORESETs, then in FIG. 9 , the number of CCEs that the terminal device can actually detect is less than the maximum number of CCEs that can be detected within the blind detection capability range of the terminal device. To this end, in an embodiment of the present application, CCEs belonging to different multiple CORESETs are non-overlapping CCEs that satisfy the following conditions: the configurations of the transmission control indications TCI, reference signal scrambling codes, and PRGs associated with multiple CORESETs are the same. That is, when the configurations of the TCI, scrambling code ID, and PRG in the CORESET are the same, the CCEs of the CORESETs that occupy different numbers of symbols are only recorded as non-overlapping CCEs once.

In an embodiment of the present application, the network device indicates the activated CORESET to the terminal device. The activated CORESET can occupy 1 symbol, 2 symbols, or 3 symbols in the time domain, which can improve the system throughput. By configuring multiple CORESETs that occupy different numbers of symbols, the terminal device can detect fixed PDCCH candidates, and the number of candidate PDCCHs for blind detection of PDCCH by the terminal device in the time unit can be as large as possible, so that the terminal device can detect the PDCCH in time, improve the flexibility of the network device in scheduling PDCCH, and reduce the probability of PDCCH conflict between terminal devices. In addition, when the number of PDCCH candidates configured by the network device exceeds the maximum number of PDCCH candidates that can be detected within the blind detection capability of the terminal device, by configuring the priority of the PDCCH candidates associated with the CORESET that the terminal device blindly detects, the terminal device can blindly detect the most PDCCH candidates within the blind detection capability, thereby improving the flexibility of scheduling PDCCH.

In the embodiments provided by the present application, the method provided by the embodiments of the present application is introduced from the perspective of the interaction between the terminal device and the network device. The terminal device and the network device may include a hardware structure and/or a software module, and the above functions are implemented in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether a function of the above functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.

Figure 10 is a schematic block diagram of a communication device 1000 provided in an embodiment of the present application. The communication device 1000 may include a processing module 1010 and a transceiver module 1020. Optionally, a storage unit may be further included, which may be used to store instructions (codes or programs) and/or data. The processing module 1010 and the transceiver module 1020 may be coupled to the storage unit. For example, the processing module 1010 may read the instructions (codes or programs) and/or data in the storage unit to implement the corresponding method. The above-mentioned units may be independently arranged or partially or fully integrated.

In some possible implementations, the communication device 1000 can implement the behaviors and functions of the terminal device in the above method embodiments, for example, the method performed by the terminal device in the embodiment of FIG7. The communication device 1000 can be a terminal device, or a component (such as a chip or circuit) applied to a terminal device, or a chip or a chipset in the terminal device or a part of a chip used to perform the functions of the related methods.

For example, the transceiver module 1020 is used to receive indication information, where the indication information is used to indicate an activated CORESET, where the activated CORESET is a part or all of the configured CORESETs. The processing module 1010 is used to perform blind detection on PDCCH candidates associated with the activated CORESET.

As an optional implementation method, the indication information is used to indicate the activated CORESET, including: the indication information indicates the number of symbols N, N is a positive integer, and the symbols occupied by the activated CORESET are located within N symbols starting from a first position, and the first position is the starting position of the time slot where the indication information is located, or the first position is the time domain starting position of the indication information.

As an optional implementation, the indication information is used to implicitly indicate the activated CORESET.

In a possible implementation, the activated CORESET takes effect on the first time unit. For example, the first time unit may be The time slot, subframe or frame where the indication information is located. Optionally, the first time unit may also be a plurality of time slots, subframes or frames starting from the indication information. Further, the first time unit may also be a time period from the start of the indication information to the start of receiving the next indication information.

As an optional implementation, the time domain starting positions of the activated CORESETs are the same.

As an optional implementation manner, the indication information is DCI, the CORESET associated with the DCI occupies 1 symbol in the time domain, and the starting position of the DCI is the first symbol of the time slot where the DCI is located.

As an optional implementation method, the activated CORESET includes a first CORESET and a second CORESET, the first CORESET is the CORESET associated with the indication information, the number of symbols occupied by the second CORESET in the time domain is N, and the configured CORESET includes multiple CORESETs occupying different numbers of symbols.

As an optional implementation manner, the activated CORESET includes a first CORESET and at least two CORESETs, the first CORESET is the CORESET associated with the indication information, and the number of symbols respectively occupied by the at least two CORESETs in the time domain is less than or equal to N.

As an optional implementation method, at least two CORESETs include a third CORESET and a fourth CORESET, the detection priority of the PDCCH candidates associated with the third CORESET is higher than the detection priority of the PDCCH candidates associated with the fourth CORESET, and the number of symbols occupied by the third CORESET in the time domain is greater than the number of symbols occupied by the fourth CORESET in the time domain.

As an optional implementation, the number of PDCCH candidates associated with the activated CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect; or, the number of PDCCH candidates associated with the configured CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect.

As an optional implementation manner, the control channel elements CCE corresponding to multiple CORESETs occupying different numbers of symbols are non-overlapping CCEs, and the following conditions are met: the TCI, reference signal scrambling code and PRG configurations associated with the multiple CORESETs are the same.

In some possible implementations, the communication device 1000 can implement the behaviors and functions of the network device in the above method embodiments, for example, the method performed by the network device in the embodiment of FIG7. The communication device 1000 can be a network device, or a component (such as a chip or circuit) used in a network device, or a chip or chipset in a network device or a part of a chip used to perform related method functions.

For example, the processing module 1010 is used to generate indication information, where the indication information is used to indicate an activated CORESET, where the activated CORESET is a part or all of the configured CORESETs. The transceiver module 1020 is used to send the indication information.

As an optional implementation method, the indication information is used to indicate the activated CORESET, including: the indication information indicates N, N is a positive integer, and the symbols occupied by the activated CORESET are located within N symbols starting from a first position, and the first position is the starting position of the time slot where the indication information is located, or the first position is the time domain starting position of the indication information.

In a possible implementation, the activated CORESET takes effect on the first time unit. Exemplarily, the first time unit may be the time slot, subframe, or frame where the indication information is located. Optionally, the first time unit may also be a plurality of time slots, subframes, or frames starting from the indication information. Further, the first time unit may also be the time period from the start of the indication information to the start of receiving the next indication information.

As an optional implementation, the activated CORESET includes a first CORESET and a second CORESET, the first CORESET is a CORESET associated with the indication information, and the number of symbols occupied by the second CORESET in the time domain is N. The configured CORESET includes multiple CORESETs occupying different numbers of symbols.

As an optional implementation manner, the activated CORESET includes a first CORESET and at least two CORESETs, the first CORESET is a CORESET associated with indication information, and the number of symbols respectively occupied by the at least two CORESETs in the time domain is less than or equal to N.

As an optional implementation, the number of PDCCH candidates associated with the activated CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect; or the number of PDCCH candidates associated with the configured CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect. The maximum number of PDCCH candidates to be measured.

As an optional implementation manner, the following conditions are met, and the CCEs corresponding to multiple CORESETs occupying different numbers of symbols are non-overlapping CCEs: the TCIs, reference signal scrambling codes, and PRG configurations associated with the multiple CORESETs are the same.

When the communication device 1000 is a chip-type device or circuit, the transceiver module may be an input/output circuit and/or a communication interface; the processing module may be an integrated processor or microprocessor or integrated circuit.

Figure 11 is a schematic block diagram of a communication device 1100 provided in an embodiment of the present application. Among them, the communication device 1100 can be a terminal device, which can implement the functions of the terminal device in the method provided in the embodiment of the present application. Alternatively, the communication device 1100 can also be a device that can support the terminal device to implement the corresponding functions in the method provided in the embodiment of the present application. Alternatively, the communication device 1100 can be a terminal device, which can implement the functions of the network device in the method provided in the embodiment of the present application. Alternatively, the communication device 1100 can also be a device that can support the network device to implement the corresponding functions in the method provided in the embodiment of the present application. Among them, the communication device 1100 can be a chip system. In the embodiment of the present application, the chip system can be composed of a chip, or it can include a chip and other discrete devices. For specific functions, please refer to the description in the above method embodiment.

The communication device 1100 includes one or more processors 1101, which are used to implement or support the communication device 1100 to implement the functions of the terminal device or network device in the method provided in the embodiment of the present application. Please refer to the detailed description in the method example for details, which will not be repeated here. The processor 1101 may also be referred to as a processing unit or a processing module, which can implement certain control functions. The processor 1101 may be a general-purpose processor or a dedicated processor, etc. For example, it includes: a baseband processor, a central processing unit, an application processor, a modem processor, a graphics processor, an image signal processor, a digital signal processor, a video codec processor, a controller, a memory, and/or a neural network processor, etc. The baseband processor can be used to process communication protocols and communication data. The central processing unit can be used to control the communication device 1100, execute software programs and/or process data. Different processors can be independent devices or integrated in one or more processors, for example, integrated in one or more application-specific integrated circuits.

Optionally, the communication device 1100 includes one or more memories 1102 for storing instructions 1104, and the instructions can be executed on the processor 1101, so that the communication device 1100 performs the method described in the above method embodiment. The memory 1102 is coupled to the processor 1101. The coupling in the embodiment of the present application is an indirect coupling or communication connection between devices, units or modules, which can be electrical, mechanical or other forms, for information exchange between devices, units or modules. The processor 1101 may operate in conjunction with the memory 1102. At least one of the at least one memory may be included in the processor. It should be noted that the memory 1102 is not required, so it is illustrated by a dotted line in Figure 11.

Optionally, data may also be stored in the memory 1102. The processor and memory may be provided separately or integrated together. In an embodiment of the present application, the memory 1102 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), such as a random-access memory (RAM). The memory is any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in the embodiment of the present application may also be a circuit or any other device that can realize a storage function, for storing program instructions and/or data.

Optionally, the communication device 1100 may include instructions 1103 (sometimes also referred to as codes or programs), and the instructions 1103 may be executed on the processor so that the communication device 1100 executes the method described in the above embodiment. The processor 1101 may store data.

Optionally, the communication device 1100 may further include a transceiver 1105 and an antenna 1106. The transceiver 1105 may be referred to as a transceiver unit, a transceiver module, a transceiver, a transceiver circuit, a transceiver, an input/output interface, etc., and is used to implement the transceiver function of the communication device 1100 through the antenna 1106.

The processor 1101 and the transceiver 1105 described in the present application may be implemented in an integrated circuit (IC), an analog IC, a radio frequency integrated circuit (RFID), a mixed signal IC, an ASIC, a printed circuit board (PCB), or an electronic device. The communication device described in this article may be an independent device (e.g., an independent integrated circuit, a mobile phone, etc.), or may be a part of a larger device (e.g., a module that can be embedded in other devices). For details, please refer to the above description of the terminal device or terminal device, which will not be repeated here.

Optionally, the communication device 1100 may also include one or more of the following components: a wireless communication module, an audio module, an external memory interface, an internal memory, a universal serial bus (USB) interface, a power management module, an antenna, a speaker, a microphone, an input/output module, a sensor module, a motor, a camera, or a display screen, etc. It is understood that in some embodiments, the communication device 1100 may include more or fewer components, or some components may be integrated, or some components may be separated. These components may be implemented in hardware, software, or a combination of software and hardware.

It should be noted that the communication device in the above embodiments may be a terminal device (or network device), or a circuit, or a chip applied to a terminal device (or network device) or other combined devices, components, etc. having the above terminal device (or network device). When the communication device is a terminal device (or network device), the transceiver module may be a transceiver, which may include an antenna and a radio frequency circuit, etc., and the processing module may be a processor, such as a central processing unit (CPU). When the communication device is a component having the functions of the above terminal device (or network device), the transceiver module may be a radio frequency unit, and the processing module may be a processor. When the communication device is a chip system, the communication device can be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a CPU, a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD) or other integrated chips. The processing module can be a processor of the chip system. The transceiver module or the communication interface can be an input and output interface or an interface circuit of the chip system. For example, the interface circuit can be a code/data read and write interface circuit. The interface circuit can be used to receive code instructions (the code instructions are stored in a memory, can be read directly from the memory, or can be read from the memory through other devices) and transmit them to the processor; the processor can be used to run the code instructions to execute the method in the above method embodiment. For another example, the interface circuit may also be a signal transmission interface circuit between the communication processor and the transceiver.

The embodiment of the present application also provides a communication system, specifically, the communication system includes at least one terminal device and at least one network device. Exemplarily, the communication system includes a terminal device for implementing the relevant functions of Figure 7 and a network device for implementing the relevant functions of Figure 7. Please refer to the relevant description in the above method embodiment for details, which will not be repeated here.

A computer-readable storage medium is also provided in an embodiment of the present application, including instructions, which, when executed on a computer, enable the computer to execute the method executed by the terminal device or network device in FIG. 7 .

A computer program product is also provided in an embodiment of the present application, including instructions, which, when executed on a computer, enable the computer to execute the method executed by the terminal device or network device in FIG. 7 .

The embodiment of the present application provides a chip system, which includes a processor and may also include a memory, for implementing the functions of the terminal device or network device in the aforementioned method. The chip system may be composed of a chip, or may include a chip and other discrete devices.

In order to realize the functions of the communication device of Figures 10 to 11, the embodiment of the present application further provides a chip, including a processor, for supporting the communication device to realize the functions involved in the terminal device or network device in the above method embodiment. In one possible design, the chip is connected to a memory or the chip includes a memory, and the memory is used to store the necessary computer programs or instructions and data of the communication device.

It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

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

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

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

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

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the part of the technical solution of the present application that contributes essentially or the part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM), RAM, magnetic disks or optical disks.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

A communication method, comprising:

receiving indication information, where the indication information is used to indicate an activated control resource set CORESET, where the activated CORESET is a part or all of the configured CORESET;

Blind detection is performed on the physical downlink control channel PDCCH candidates associated with the activated CORESET.
The method according to claim 1, wherein the indication information is used to indicate the activated control resource set CORESET, including:

The indication information indicates the number of symbols N, the number of symbols of the activated CORESET is less than or equal to the N, and the N is a positive integer;

The PDCCH candidate associated with the activated CORESET is located within the N symbols starting from a first position, where the first position is the starting position of the time slot where the indication information is located, or the first position is the time domain starting position of the indication information.
The method as claimed in claim 2 is characterized in that the indication information is downlink control information DCI, the CORESET associated with the DCI occupies 1 symbol in the time domain, and the starting position of the DCI is the first symbol of the time slot where the indication information is located.
The method as claimed in claim 2 or 3 is characterized in that the activated CORESET includes a first CORESET and a second CORESET, the first CORESET is the CORESET associated with the indication information, the number of symbols occupied by the second CORESET in the time domain is the N, wherein the configured CORESET includes multiple CORESETs occupying different numbers of symbols.
The method according to claim 2 or 3 is characterized in that the activated CORESET includes a first CORESET and at least two CORESETs, the first CORESET is the CORESET associated with the indication information, and the number of symbols respectively occupied by the at least two CORESETs in the time domain is less than or equal to the N.
The method as claimed in claim 5, characterized in that the at least two CORESETs include a third CORESET and a fourth CORESET, the detection priority of the PDCCH candidate associated with the third CORESET is higher than the detection priority of the PDCCH candidate associated with the fourth CORESET, and the number of symbols occupied by the third CORESET in the time domain is greater than the number of symbols occupied by the fourth CORESET in the time domain.
The method as claimed in claim 6 is characterized in that the number of PDCCH candidates associated with the activated CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect; or, the number of PDCCH candidates associated with the configured CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect.
The method according to claim 1, characterized in that the control channel elements CCE corresponding to multiple CORESETs occupying different numbers of symbols are non-overlapping CCEs when the following conditions are met:

The configurations of the transmission control indication TCI, reference signal scrambling code and physical resource group PRG associated with the multiple CORESETs are the same.
A communication method, comprising:

Determine indication information, where the indication information is used to indicate an activated control resource set CORESET, where the activated CORESET is a part or all of the configured CORESET;

The indication information is sent.
The method according to claim 9, wherein the indication information is used to indicate the activated control resource set CORESET, including:

The indication information indicates the number of symbols N, the number of symbols of the activated CORESET is less than or equal to the N, and N is a positive integer;

The physical downlink control channel PDCCH candidate associated with the activated CORESET is located within the N symbols starting from the first position, and the first position is the starting position of the time slot where the indication information is located, or the first position is the time domain starting position of the indication information.
The method as claimed in claim 10 is characterized in that the indication information is downlink control information DCI, the CORESET associated with the DCI occupies 1 symbol in the time domain, and the starting position of the DCI is the first symbol of the time slot where the indication information is located.
The method according to claim 10 or 11 is characterized in that the activated CORESET includes a first CORESET and a second CORESET, the first CORESET is the CORESET associated with the indication information, the number of symbols occupied by the second CORESET in the time domain is the N, wherein the configured CORESET includes multiple CORESETs occupying different numbers of symbols.
The method according to claim 10 or 11, characterized in that the activated CORESET includes a first CORESET and at least two CORESETs, the first CORESET is the CORESET associated with the indication information, and the at least two CORESETs The number of symbols respectively occupied in the time domain is less than or equal to the N.
The method as claimed in claim 13, characterized in that the at least two CORESETs include a third CORESET and a fourth CORESET, the detection priority of the PDCCH candidate associated with the third CORESET is higher than the detection priority of the PDCCH candidate associated with the fourth CORESET, and the number of symbols occupied by the third CORESET in the time domain is greater than the number of symbols occupied by the fourth CORESET in the time domain.
The method as claimed in claim 14 is characterized in that the number of PDCCH candidates associated with the activated CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect; or, the number of PDCCH candidates associated with the configured CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect.
The method according to claim 9, characterized in that the control channel elements CCE corresponding to multiple CORESETs occupying different numbers of symbols are non-overlapping CCEs when the following conditions are met:

The configurations of the transmission control indication TCI, reference signal scrambling code and physical resource group PRG associated with the multiple CORESETs are the same.
A communication device, characterized in that it comprises a processing module and a transceiver module;

The transceiver module is used to receive indication information, where the indication information is used to indicate an activated control resource set CORESET, where the activated CORESET is a part or all of the configured CORESET;

The processing module is used to perform blind detection on the physical downlink control channel PDCCH candidates associated with the activated CORESET.
The apparatus according to claim 17, wherein the indication information is used to indicate an activated control resource set CORESET, and includes:

The indication information indicates the number of symbols N, the number of symbols of the activated CORESET is less than or equal to the N, and the N is a positive integer;

The PDCCH candidate associated with the activated CORESET is located within the N symbols starting from a first position, where the first position is the starting position of the time slot where the indication information is located, or the first position is the time domain starting position of the indication information.
The device as claimed in claim 18 is characterized in that the indication information is downlink control information DCI, the CORESET associated with the DCI occupies 1 symbol in the time domain, and the starting position of the DCI is the first symbol of the time slot where the indication information is located.
The device as described in claim 17 or 18 is characterized in that the activated CORESET includes a first CORESET and a second CORESET, the first CORESET is the CORESET associated with the indication information, the number of symbols occupied by the second CORESET in the time domain is the N, and the configured CORESET includes multiple CORESETs occupying different numbers of symbols.
The device as described in claim 17 or 18 is characterized in that the activated CORESET includes a first CORESET and at least two CORESETs, the first CORESET is the CORESET associated with the indication information, and the number of symbols respectively occupied by the at least two CORESETs in the time domain is less than or equal to the N.
The apparatus as described in claim 21 is characterized in that the at least two CORESETs include a third CORESET and a fourth CORESET, the detection priority of the PDCCH candidate associated with the third CORESET is higher than the detection priority of the PDCCH candidate associated with the fourth CORESET, and the number of symbols occupied by the third CORESET in the time domain is greater than the number of symbols occupied by the fourth CORESET in the time domain.
The apparatus as claimed in claim 21, characterized in that the number of PDCCH candidates associated with the activated CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect; or, the number of PDCCH candidates associated with the configured CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect.
The device according to claim 17, characterized in that the control channel elements CCE corresponding to multiple CORESETs occupying different numbers of symbols are non-overlapping CCEs when the following conditions are met:

The configurations of the transmission control indication TCI, reference signal scrambling code and physical resource group PRG associated with the multiple CORESETs are the same.
A communication device, characterized in that it comprises a processing module and a transceiver module;

The processing module is used to determine indication information, where the indication information is used to indicate an activated control resource set CORESET, where the activated CORESET is a part or all of the configured CORESET;

The transceiver module is used to send the indication information.
The apparatus according to claim 25, wherein the indication information is used to indicate an activated control resource set CORESET, including:

The indication information indicates the number of symbols N, the number of symbols of the activated CORESET is less than or equal to the N, and the N is a positive integer;

The physical downlink control channel PDCCH candidate associated with the activated CORESET is located within the N symbols starting from the first position, and the first position is the starting position of the time slot where the indication information is located, or the first position is the time domain starting position of the indication information.
The device as described in claim 26 is characterized in that the indication information is downlink control information DCI, the CORESET associated with the DCI occupies 1 symbol in the time domain, and the starting position of the DCI is the first symbol of the time slot where the indication information is located.
The device as described in claim 26 or 27 is characterized in that the activated CORESET includes a first CORESET and a second CORESET, the first CORESET is the CORESET associated with the indication information, the number of symbols occupied by the second CORESET in the time domain is the N, and the configured CORESET includes multiple CORESETs occupying different numbers of symbols.
The device as described in claim 26 or 27 is characterized in that the activated CORESET includes a first CORESET and at least two CORESETs, the first CORESET is the CORESET associated with the indication information, and the number of symbols respectively occupied by the at least two CORESETs in the time domain is less than or equal to the N.
The apparatus as described in claim 29, characterized in that the at least two CORESETs include a third CORESET and a fourth CORESET, the detection priority of the PDCCH candidate associated with the third CORESET is higher than the detection priority of the PDCCH candidate associated with the fourth CORESET, and the number of symbols occupied by the third CORESET in the time domain is greater than the number of symbols occupied by the fourth CORESET in the time domain.
The apparatus as described in claim 29 is characterized in that the number of PDCCH candidates associated with the activated CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect; or, the number of PDCCH candidates associated with the configured CORESET exceeds the maximum number of PDCCH candidates that the terminal device can detect.
The apparatus according to claim 25, wherein the control channel elements CCE corresponding to a plurality of CORESETs occupying different numbers of symbols are non-overlapping CCEs when the following conditions are met:

The configurations of the transmission control indication TCI, reference signal scrambling code and physical resource group PRG associated with the multiple CORESETs are the same.
A communication device, characterized in that the communication device includes a processor and a communication interface, the communication interface is used to receive signals from other communication devices outside the communication device and transmit them to the processor or to send signals from the processor to other communication devices outside the communication device; the processor is used to implement the method described in any one of claims 1 to 8 through a logic circuit or by executing code instructions, or the processor is used to implement the method described in any one of claims 9 to 16 through a logic circuit or by executing code instructions.
A chip system, characterized in that the chip system includes: a processor and an interface, the processor is used to call and run instructions from the interface, and when the processor executes the instructions, it implements the method as described in any one of claims 1-8, or implements the method as described in any one of claims 9-16.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 8 or the method according to any one of claims 9 to 16 is implemented.
A computer program product, characterized in that the computer program product comprises a computer program, and when the computer program is run on a computer, the computer is caused to execute the method as described in any one of claims 1 to 8, and the computer is caused to execute the method as described in any one of claims 9 to 16.