UE Beam Switching Overlap Handling in 5G NR
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Solution Overview
Problem
Current 5G New Radio (NR) technology faces challenges in efficiently monitoring and receiving control resource sets (CORESET) and physical downlink shared channels (PDSCH) due to different transmission configuration indication (TCI) states, leading to overlapping and inefficient data channel reception.
Innovation Solution
A method where a user equipment (UE) determines if the TCI states for monitoring a CORESET and receiving PDSCH overlap, and if so, skips or partially receives the overlapping data channels, using a parameter like beamSwitchTime to manage beam switching and gap periods, thereby optimizing data reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE monitors CORESET and receives PDSCH in different TCI states simultaneously, then the system can support diverse transmission configurations and improve adaptability, but the processing complexity and overhead increase due to overlapping channel reception requirements
Solution Approach 1:
The patent implements dynamic beam switching by allowing the UE to switch between different TCI states based on timing relationships. The gap period mechanism enables the UE to dynamically transition between beam configurations (first TCI state for CORESET, second TCI state for PDSCH) when time conditions permit, while avoiding switching when overlap would occur. This dynamic adaptation resolves the contradiction by making the system flexible when possible but simplifying processing when conflicts arise.
2Reliability
If the UE receives all downlink data channels regardless of overlap, then complete data reception is ensured, but unnecessary decoding and HARQ-ACK reporting increase processing overhead and reduce efficiency
Solution Approach 1:
The patent applies partial action by having the UE selectively receive only non-overlapping portions of downlink data channels. When a PDSCH overlaps with a CORESET in the time domain, the UE performs partial reception - receiving and decoding only the non-overlapping portion of the PDSCH. This avoids the excessive action of receiving and processing entire overlapping channels, thereby improving processing efficiency while maintaining reliability for the received portion.
Solution Approach 2:
The patent extracts and removes the overlapping portion of downlink data channels from the reception process. When overlap is detected between CORESET and PDSCH, the UE identifies and excludes the overlapping time resources from PDSCH reception. This extraction principle eliminates unnecessary decoding operations on overlapping segments, reducing processing overhead while preserving complete reception of non-overlapping data portions.
3Loss of information
If the UE performs full reception of overlapping downlink data channels, then no data is lost, but the gap period for beam switching cannot be properly implemented, reducing beam switching accuracy
Solution Approach 1:
The patent implements partial reception of downlink data channels, receiving only the non-overlapping portions that fall outside the gap period. By accepting that some data portions (the overlapping parts during gap periods) will not be received, the system enables proper beam switching to occur during these gap periods. This partial action resolves the contradiction by prioritizing beam switching precision over complete data reception in overlapping scenarios.
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives a control resource set (CORESET) configuration indicating a CORESET, in a slot, in which a control signal is to be transmitted according to a first transmission configuration indication (TCI) state. The UE receives a downlink control information indicating that one or more downlink data channels are to be transmitted according to a second TCI state. The UE determines that the one or more downlink data channels overlap, in time domain, with the CORESET combined with a gap period. The UE performs reception of a smaller portion of the one or more downlink data channels.