PDCCH Repetition BWP Switching Timing
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Solution Overview
Problem
Existing methods for multi-Transmission and Reception Point (TRP) deployment face challenges in reliably and robustly handling Physical Downlink Control Channel (PDCCH) repetition, particularly in time division multiplexing scenarios, where linked PDCCH candidates may not be fully utilized within the first 3 symbols of a slot for bandwidth part (BWP) switching, leading to unclear UE behavior and timing for transmission or reception.
Innovation Solution
The method involves monitoring and detecting downlink control information (DCI) across linked PDCCH candidates to determine active BWP changes, with specific timing adjustments based on the PDCCH candidates' positions within a slot, ensuring accurate UE behavior and transmission/reception timing by designating a reference PDCCH candidate and calculating a time duration for non-participation based on the DCI format's scheduling offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH repetition is enabled with linked PDCCH candidates for BWP switching, then reliability of control channel transmission is improved, but timing for UE behavior and transmission/reception becomes unclear
Solution Approach 1:
The patent establishes predetermined rules for UE behavior in advance: when a DCI format with BWP switching indication is detected in a first PDCCH candidate of a linked pair, the UE determines the time duration for non-transmission/non-reception based on the scheduling offset in the DCI format. This preliminary establishment of timing rules resolves the ambiguity about when the UE should switch BWP and when it should refrain from transmission or reception, thereby maintaining reliability while clarifying timing.
2Adaptability or versatility
If linked PDCCH candidates are used within the first 3 symbols of a slot, then BWP switching capability is improved, but the number of available candidates is limited
Solution Approach 1:
The patent extends the utility of PDCCH candidates beyond the traditional first 3 symbols constraint by allowing linked PDCCH candidates to span across symbol boundaries. Specifically, when the first PDCCH candidate is within the first 3 symbols, the UE can detect BWP switching indications and determine appropriate time durations, effectively utilizing candidates that may extend into later symbols. This dimensional extension in time domain resolves the limitation on candidate quantity while maintaining adaptability for BWP switching.
3Adaptability or versatility
If DCI format with scheduling offset is used for BWP switching, then flexibility in timing adjustment is improved, but complexity of UE behavior determination increases
Solution Approach 1:
The patent utilizes the scheduling offset parameter within the DCI format to dynamically adjust timing for BWP switching. When the UE detects a DCI format with a BWP switching indication in a first PDCCH candidate, it extracts the scheduling offset value and uses it to determine the time duration for non-transmission and non-reception. This parameter-based approach provides flexible timing adjustment while maintaining relatively simple UE behavior through standardized parameter interpretation.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer storage media for communication. A method comprises monitoring, at a terminal device, a first Physical Downlink Control Channel (PDCCH) candidate and a second PDCCH candidate, wherein the first PDCCH candidate and the second PDCCH candidate are linked for PDCCH repetition. The method further comprises in response to a predetermined condition being satisfied, detecting, from at least one of the first and second PDCCH candidates, downlink control information (DCI) comprising a bandwidth part (BWP) indicator field indicating an active BWP change.