Detecting method and transmitting method of physical downlink control channel, and corresponding equipments

Patent metadata

Field	Value
Publication number	US-12207265-B2
Application number	US-201917250935-A
Country	US
Kind code	B2
Filing date	Sep 30, 2019
Priority date	Sep 30, 2018
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

Abstract

A method includes performing blind detection on a PDCCH in at least one subframe or slot to acquire first downlink control information and second downlink control information; and performing uplink data transmission and downlink data transmission with a base station according to the acquired first downlink control information and second downlink control information, wherein the first downlink control information is one of downlink control information for uplink scheduling grant and downlink control information for downlink scheduling, and the second downlink control information is the other one of the downlink control information for uplink scheduling grant and the downlink control information for downlink scheduling, and wherein a location where a PDCCH carrying the second downlink control information is detected is associated with related information of the first downlink control information, or the first downlink control information and the second downlink control information are carried on the same PDCCH.

First claim

The invention claimed is:

1. A method performed by a user equipment (UE) in a communication system, the method comprising:
performing blind detection on a physical downlink control channel (PDCCH) in at least one subframe or slot to acquire first downlink control information and second downlink control information; and
performing uplink data transmission and downlink data reception with a base station according to the acquired first downlink control information and second downlink control information,
wherein the first downlink control information is one of downlink control information for uplink scheduling grant and downlink control information for downlink scheduling, and the second downlink control information is the other one of the downlink control information for the uplink scheduling grant and the downlink control information for the downlink scheduling,
wherein a location where a PDCCH carrying the second downlink control information is detected is associated with related information of the first downlink control information,
wherein the related information of the first downlink control information is at least one of an aggregation level of a PDCCH carrying the first downlink control information, a location of the PDCCH carrying the first downlink control information in a search subspace, or content in a specific field in the first downlink control information,
wherein when the first downlink control information and the second downlink control information are carried on the same one PDCCH, the first downlink control information and the second downlink control information are contained in third downlink control information, and performing blind detection on the PDCCH to acquire first downlink control information and second downlink control information comprises:
performing blind detection on the PDCCH based on a length of the third downlink control information in one subframe or slot, to acquire the third downlink control information; and
obtaining the first downlink control information and the second downlink control information, based on the acquired third downlink control information, and
wherein the third downlink control information only includes only one set of resource allocation fields for indicating the same resources used in uplink and downlink data transmissions.

2. The method of claim 1 ,
wherein the search subspace is a subspace in a UE-specific search space, and
wherein the content in the specific field is used for indicating an aggregation level of the PDCCH carrying the second downlink control information and/or a location of the PDCCH carrying the second downlink control information in the search subspace.

3. The method of claim 1 , wherein, when the first downlink control information and the second downlink control information are carried on different PDCCHs, the performing blind detection on the PDCCH to acquire first downlink control information and second downlink control information comprises:
detecting the PDCCH carrying the first downlink control information blindly in one subframe or slot to acquire the first downlink control information; and
performing blind detection on the PDCCH carrying the second downlink control information based on the related information of the first downlink control information in a subframe or slot used for transmitting the PDCCH carrying the second downlink control information, to acquire the second downlink control information,
wherein the one subframe or slot and the subframe or slot used for transmitting the PDCCH carrying the second downlink control information are the same one subframe or slot, or are different subframes or slots.

4. The method of claim 3 , wherein the performing blind detection on the PDCCH carrying the second downlink control information based on the related information of the first downlink control information comprises:
determining an aggregation level of the PDCCH carrying the second downlink control information and/or the location of the PDCCH carrying the second downlink control information in the search subspace based on the related information of the first downlink control information; and
performing blind detection on the PDCCH carrying the second downlink control information in a location, which is defined by the determined aggregation level and/or the location in the search subspace, in the subframe or slot used for transmitting the PDCCH carrying the second downlink control information, to acquire the second downlink control information.

5. The method of claim 4 , wherein the determining an aggregation level of the PDCCH carrying the second downlink control information and/or the location of the PDCCH carrying the second downlink control information in the search subspace based on the related information of the first downlink control information comprises:
determining the aggregation level of the PDCCH carrying the second downlink control information and/or the location of the PDCCH carrying the second downlink control information in the search subspace based on the content in the specific field in the first downlink control information; or
determining the aggregation level of the PDCCH carrying the second downlink control information and/or the location of the PDCCH carrying the second downlink control information in the search subspace based on the content in the specific field in the first downlink control information, and the aggregation level of the PDCCH carrying the first downlink control information and/or the location of the PDCCH carrying the first downlink control information in the search subspace; or
calculating the aggregation level of the PDCCH carrying the second downlink control information and/or the location of the PDCCH carrying the second downlink control information in the search subspace based on the aggregation level of the PDCCH carrying the first downlink control information and/or the location of the PDCCH carrying the first downlink control information in the search subspace, by using a location correlation function.

6. The method of claim 3 , wherein when the one subframe or slot and the subframe or slot used for transmitting the PDCCH carrying the second downlink control information are different subframes or slots, further comprising:
transmitting blind detection feedback information to a corresponding base station after performing blind detection on the PDCCH carrying the second downlink control information,
wherein when the PDCCH carrying the second downlink control information is detected, blind detection feedback information for indicating that the PDCCH carrying the second downlink control information is detected is transmitted to the corresponding base station, and
wherein when no PDCCH carrying the second downlink control information is detected in the subframe or slot used for transmitting the PDCCH carrying the second downlink control information, blind detection feedback information for indicating that no PDCCH carrying the second downlink control information is detected is transmitted to the corresponding base station.

7. The method of claim 1 ,
wherein the length of the third downlink control information includes a first length and a second length, and a length of unidirectional downlink control information includes the second length and a third length, wherein the first length is longer than the second length, and the second length is longer than the third length, or
wherein the length of the third downlink control information only includes a fourth length, and a length of unidirectional downlink control information only includes a fifth length, wherein the fourth length is longer than the fifth length.

8. A method performed by a base station in a communication system, the method comprising:
transmit

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lin Peng
• Su Di
• Yu Bin
• Qian Chen
• Zhang Chuang

Classifications

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L5/0094

  Indication of how sub-channels of the path are allocated · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title