Downlink Control Channel Transmission via CORESET Grouping
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Solution Overview
Problem
In LTE systems, terminals face challenges in detecting and receiving downlink control channels in allocated control resource sets (CORESETs) due to the lack of clear methods for handling multiple beams and varying scheduling information across different beams.
Innovation Solution
The method involves a base station allocating CORESET groups or PDCCH candidate groups to terminals, allowing them to detect and receive specific DCI formats within these groups, thereby enabling effective detection and reception of downlink control channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station sends DCI format with the same information on different beams or different scheduling information on different beams, then the sending reliability is enhanced, but the terminal detection complexity increases due to lack of clear method
Solution Approach 1:
The patent divides the control resource set into multiple beam-related CORESETs, where each CORESET corresponds to a specific beam direction. The terminal is configured to monitor multiple CORESETs simultaneously, with each CORESET containing PDCCH candidates for specific beam pair links. This segmentation allows the base station to transmit DCI on different beams while the terminal can systematically detect and receive the appropriate DCI based on configured beam information, resolving the contradiction between reliability enhancement and detection complexity.
2Reliability
If multiple beam pair links are monitored simultaneously, then robustness against beam pair link blocking is achieved, but the configuration and detection method becomes unclear
Solution Approach 1:
The patent implements preliminary configuration where the base station configures the terminal with multiple CORESETs and their corresponding beam pair link information before actual communication. The terminal stores this configuration information and uses it to determine which CORESETs to monitor and how to interpret the DCI formats. This preliminary setup eliminates the need for complex real-time configuration decisions during operation, achieving both robustness and operational clarity.
3Adaptability or versatility
If the terminal blindly detects DCI format, then flexibility is maintained, but detection efficiency decreases when multiple CORESETs are involved
Solution Approach 1:
The patent applies local quality by configuring different PDCCH candidate groups in different CORESETs with specific DCI format expectations. Instead of uniform blind detection across all CORESETs, the terminal is configured with beam-related information that indicates which DCI formats are expected in each CORESET. This allows the terminal to efficiently detect DCI by focusing on locally relevant formats in each CORESET while maintaining overall flexibility for different scheduling scenarios.
Data Source
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AI summary
Disclosed are a method and device for transmitting a downlink control channel. The method comprises: a terminal receives configuration information sent by a base station device, the configuration information comprising control resource set (CORESET) group information or PDCCH candidate group information in at least one CORESET allocated by the base station device to the terminal in a downlink control channel monitoring occasion; when the configuration information comprises the CORESET group information, the terminal determines at least one group of CORESETs from the configuration information, and detects and receives at most one piece of DCI from each group of CORESETs in the at least one group of CORESETs according to a specific DCI format expected by the terminal; when the configuration information comprises the PDCCH candidate group information in the at least one CORESET, the terminal determines at least one group of PDCCH candidates from the configuration information, and detects and receives at most one piece of DCI from each group of PDCCH candidates in the at least one group of PDCCH candidates according to the specific DCI format expected by the terminal.