PDCCH Reliability via Linked Search Space Sets in Multi-TRP
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Solution Overview
Problem
In wireless communication systems, particularly in multi-TRP (multiple transmission and reception point) operations, the physical downlink control channel (PDCCH) reliability is limited due to its restricted duration, which affects the transmission efficiency and reliability of control information.
Innovation Solution
The method involves establishing linkages between search space sets and their corresponding PDCCH candidates, allowing for increased repetition and duration of PDCCH transmission, thereby enhancing reliability by increasing the number of symbols used for PDCCH transmission and accumulating more time and energy for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PDCCH transmission duration is extended to improve reliability, then the transmission reliability improves, but the device complexity increases due to multiple search space sets and linked PDCCH candidates
Solution Approach 1:
The PDCCH transmission is segmented into multiple search space sets (first search space set and second search space set), each containing multiple PDCCH candidates. This segmentation allows the transmission to be divided across different time resources, extending the overall duration and improving reliability through diversity while managing complexity through structured organization of the segmented components
Solution Approach 2:
The patent implements periodic PDCCH transmission across multiple search space sets with defined monitoring periods and offsets. By establishing periodic action patterns where linked search space sets are monitored at regular intervals, the system extends effective transmission duration and improves reliability through repeated opportunities for successful reception, while the periodic structure provides a manageable framework that controls device complexity
2Use of energy by moving object
If multiple linked search space sets are configured to increase PDCCH duration, then the transmission energy accumulation improves, but the monitoring complexity at the UE increases
Solution Approach 1:
The network configures linked search space sets where the linkage relationship provides implicit feedback to the UE about which search space sets are related. This feedback mechanism allows the UE to understand the monitoring requirements and energy accumulation pattern without complex explicit signaling, as the linkage configuration itself conveys the operational instructions for monitoring multiple search space sets
Solution Approach 2:
The network device performs preliminary configuration of the linked search space sets and linkage relationships before UE monitoring begins. By pre-establishing the configuration including the linkage between first and second search space sets, the UE receives ready-to-use monitoring parameters that simplify its operation, eliminating the need for complex real-time decisions about which search space sets to monitor and how to accumulate energy across them
Data Source
AI summary
Provided is a method for a user equipment (UE). The UE obtains a first control information from a network device. The first control information indicates a plurality of search space sets including a first search space set and a second search space set. The first search space set and the second search space set are linked. The first search space set includes a first physical downlink control channel (PDCCH) candidate for the first search space set and the second search space set includes a first PDCCH candidate for the second search space set. The first PDCCH candidate for the first search space set and the first PDCCH candidate for the second search space set are linked. The UE monitors PDCCH candidates based on the first control information.