Linked PDCCH Candidate Timing Rules for In-Sequence DCI
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing linked physical downlink control channel (PDCCH) candidates, particularly in determining the reference timing for changes or updates in downlink control information (DCI) across multiple PDCCH candidates, which can lead to inefficiencies and misalignment in communication scheduling.
Innovation Solution
Implementing reference timing rules that define the timing for changes or updates in DCI based on the association between sets of PDCCH candidates, ensuring that DCI is received and processed in-sequence, thereby aligning communication schedules and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple linked PDCCH candidates are used to carry DCI, then communication reliability is improved through redundancy, but timing ambiguity increases causing synchronization loss
Solution Approach 1:
The patent introduces a reference timing rule as an intermediary mechanism that mediates between the multiple PDCCH candidates and the UE timing interpretation. This rule acts as a mediator to resolve the timing ambiguity by establishing a clear reference point (based on first or last candidate timing) that all DCI interpretations must align with, thus maintaining synchronization while preserving the redundancy benefits of multiple candidates.
Solution Approach 2:
The patent changes the timing parameter interpretation by introducing reference timing rules that modify how the UE perceives time relative to the PDCCH candidates. By changing the reference frame from absolute timing to relative timing based on candidate ordering (first or last candidate), the system resolves timing ambiguity while maintaining the structural integrity of multiple linked candidates for reliability.
2Measurement precision
If reference timing rules are implemented to resolve timing ambiguity, then synchronization is improved, but system complexity increases
Solution Approach 1:
The patent segments the timing resolution problem by dividing the PDCCH candidates into ordered sequences (first candidate, last candidate) and applying different reference timing rules to different scenarios. This segmentation allows the complex timing resolution to be broken down into simpler, manageable cases that the UE can process systematically without requiring overly complex processing logic.
Solution Approach 2:
Instead of having the UE actively determine timing based on complex analysis of multiple candidates, the patent inverts the approach by pre-establishing reference timing rules that define timing based on the structure of the candidates themselves (first or last candidate timing). This inversion shifts the complexity from UE processing to network configuration, simplifying the UE's timing determination task.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may monitor for downlink control information (DCI) among a plurality of physical downlink control channel (PDCCH) candidates that are associated with each other, the plurality of PDCCH candidates including at least a first PDCCH candidate in a first transmission time period and a last PDCCH candidate in a second transmission time period. The UE may identify a reference timing rule based at least in part on the association between the plurality of PDCCH candidates, the reference timing rule indicating that a reference time is to be determined based at least in part on either the first transmission time period or the second transmission time period. The UE may determine the reference time based at least in part on the reference timing rule and communicate based at least in part on the reference time.