BACKGROUND

In a Long Term Evolution (LTE) system, a PDCCH is generally transmitted in a control area of the system. The control area of the system usually occupies the entire system bandwidth. The number of symbols occupied in a time domain is 1-4. The number of symbols may be notified to a terminal device by a Physical Control Format Indicator Channel (PCFICH).

In the technical discussion on New Radio (NR) of a 5th Generation (5G) system, the concept of a Control Resource Set (CORESET) is introduced. CORESET can configure frequency domain resources occupied by a PDCCH search space and the length of a time domain. For example, several Orthogonal Frequency Division Multiplexing (OFDM) symbols are occupied in terms of time, a network device may configure multiple CORESETs for a terminal device. A search space configured by the network device may be associated with a certain CORESET, and the position of time-frequency resources occupied by the search space can be determined by configuring relevant parameters for the search space.

SUMMARY

The disclosure relates to the field of communications, and more particularly, to a method for blind detection of a Physical Downlink Control Channel (PDCCH) and a terminal device.

A first aspect provides a method for blind detection of a PDCCH. The method may be implemented by a terminal device which has at least one search space comprising n UE-specific search spaces and m common search spaces. The method may include that: when the number of PDCCH blind detections in the at least one search space of the terminal device is greater than a maximum number of blind detections, the terminal device reduces the number of PDCCH blind detections in the n UE-specific search spaces included in the at least one search space, the reduced number of PDCCH blind detections in the at least one search space being less than or equal to the maximum number of blind detections, where n and m are integers greater than or equal to 0, and n and m are not 0 at the same time; and the terminal device performs a PDCCH blind detection in the at least one search space according to the reduced number of PDCCH blind detections in the at least one search space.

A second aspect provides a terminal device. The terminal device is configured to perform the method in the first aspect or any possible implementation of the first aspect. Specifically, the terminal device includes units configured to perform the method in the first aspect or any possible implementation of the first aspect.

A third aspect provides a terminal device. The terminal device includes a memory and a processor. The memory is configured to store an instruction. The processor is configured to execute the instruction stored in the memory, and when the processor executes the instruction stored in the memory, the processor is caused to perform the method in the first aspect or any possible implementation of the first aspect.

A fourth aspect provides a computer-readable medium that is configured to store a computer program. The computer program can include an instruction for performing the method in the first aspect or any possible implementation of the first aspect.

A fifth aspect provides a computer program product including an instruction. When a computer runs the instruction of the computer program product, the computer can perform the method for blind detection of a PDCCH in the first aspect or any possible implementation of the first aspect. Specifically, the computer program product may be run on the terminal device in the second aspect.

