Linking PDCCH Candidates Across Search Space Sets
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Solution Overview
Problem
Existing systems face challenges in effectively linking Physical Downlink Control Channel (PDCCH) candidates across two linked Search Space (SS) sets, particularly in configuring common parameters for PDCCH monitoring periodicity, number of candidates, and Downlink Control Information formats, which affects PDCCH repetition reliability.
Innovation Solution
A method is proposed where a wireless device configures two linked SS sets with a common set of parameters, including PDCCH monitoring periodicity, number of candidates, and DCI formats, and activates corresponding Control Resource Sets (CORESETs) with specific Transmission Configuration Indicator (TCI) states to link PDCCH candidates across slots and occasions, enabling intra-slot and inter-slot repetition in either Time Division Multiplexing (TDM) or Frequency Division Multiplexing (FDM) manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH candidates are linked across two linked Search Space sets with common parameters configuration, then PDCCH repetition reliability is improved, but the device complexity increases due to additional configuration and monitoring requirements
Solution Approach 1:
The patent divides the PDCCH monitoring function into two separate Search Space sets (first SS set and second SS set), each associated with different CORESETs. By segmenting the monitoring across multiple SS sets with common parameters configuration, the system achieves PDCCH repetition while distributing the complexity across modular components rather than concentrating it in a single complex structure.
Solution Approach 2:
The patent configures both Search Space sets with a common set of parameters (monitoring periodicity, number of candidates, DCI formats), making them functionally equivalent but spatially separated. This universal configuration allows the same monitoring parameters to be applied across multiple SS sets, simplifying the overall configuration management while enabling reliable repetition.
2Reliability
If PDCCH monitoring is performed in multiple slots and occasions, then detection reliability is improved, but the time consumption and monitoring overhead increase
Solution Approach 1:
The patent performs PDCCH monitoring in advance across multiple slots and occasions within the configured monitoring periodicity. By proactively monitoring in the first and second SS sets before data transmission is complete, the system ensures reliable detection of scheduling assignments and control information, allowing the UE to prepare for upcoming data transmissions.
Solution Approach 2:
The patent implements periodic PDCCH monitoring according to a configured monitoring periodicity parameter. The UE monitors PDCCH candidates at regular intervals across multiple slots in the first and second SS sets, creating a periodic monitoring pattern that balances detection reliability with time efficiency by not continuously monitoring but rather at optimized periodic intervals.
Data Source
AI summary
Systems and methods for linking Physical Downlink Control Channel (PDCCH) candidates are provided herein. In some embodiments, a method includes: receiving a configuration of a first and second Control Resource Set (CORESET) associated with a first and second Search Space (SS) set; determining that the first and second SS set are configured with a common set of parameters; activating the first and second CORESET with a first and second TCI state; linking a first PDCCH candidate in a first PDCCH monitoring occasion to a second PDCCH candidate in a second PDCCH monitoring occasion; receiving a PDCCH in the first PDCCH candidate and the PDCCH in the second PDCCH candidate; and detecting the PDCCH in the first and the second PDCCH candidates. Some embodiments might provide a simple way for linking PDCCH candidates in two SS sets to support both intra-slot and inter-slot PDCCH repetition in either TDM or FDM manner.