5G UE Multi-TRP Capability Grouping for Overlapping PDSCH Handling
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Solution Overview
Problem
In 5G NR networks, user equipment (UE) faces challenges in handling overlapping physical downlink shared channel (PDSCH) transmissions and default beam selection, particularly when PDSCHs are scheduled with time offsets less than the beam switching time, leading to interference and inefficient resource utilization. Additionally, dynamic spectrum sharing with LTE signals can cause collisions between demodulation reference signals (DMRS) and cell-specific reference signals (CRS), resulting in interference.
Innovation Solution
The UE groups its capabilities for handling overlapping PDSCH transmissions into multiple groups and reports these capabilities to the gNB, determining a default beam for reception and shifting DMRS in dynamic spectrum sharing environments to minimize interference. This involves configuring the UE with a processor to handle multi-transmission/reception points (TRP) and transmitting capability information to the gNB, enabling better scheduling and interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PDSCH transmissions are scheduled with overlapping time-frequency resources to improve throughput, then network throughput is improved, but interference between transmissions increases and reception reliability deteriorates
Solution Approach 1:
The UE segments overlapping PDSCH transmissions into separate groups based on their time-frequency resource overlaps and TRP associations. Each group is handled with appropriate reception strategies, allowing the system to maintain high throughput by accepting multiple overlapping transmissions while managing interference through structured grouping and selection of reception methods.
2Adaptability or versatility
If PDSCH is scheduled with time offset less than beam switching time, then scheduling flexibility is improved, but beam switching cannot be completed leading to degraded reception quality
Solution Approach 1:
The UE determines the default beam in advance based on the lowest TCI codepoint from configured TCI codepoints before PDSCH reception. This preliminary beam selection ensures that even when PDSCH is scheduled with insufficient time offset for beam switching, the UE has a predetermined beam ready for reception, maintaining reception quality while allowing flexible scheduling.
3Productivity
If DMRS and CRS are transmitted simultaneously in DSS environment, then spectrum utilization is improved, but signal collision occurs causing interference
Solution Approach 1:
The system allows DMRS and CRS to coexist in the DSS environment, converting the potential harmful collision into a manageable scenario. The UE is configured to handle the interference between DMRS and CRS from same TRP by applying appropriate reception processing, thereby maintaining high spectrum utilization while mitigating the interference through configured handling mechanisms.
Data Source
AI summary
A user equipment (UE) is configured with multi-transmission and reception point (multi-TRP) operation. The UE groups capabilities of handling two overlapping physical downlink shared channel (PDSCH) transmissions into a plurality of groups, determining a UE capability of handling two overlapping PDSCH transmissions based on the plurality of groups and transmits the UE capability to a next generation nodeB (gNB) of a 5G new radio (NR) wireless network. The UE also determines if a demodulation reference signal (DMRS) of a physical downlink shared channel (PDSCH) transmission collides with a cell-specific reference signal (CRS) of a long term evolution (LTE) transmission and determines if the CRS originated from a same multi-transmission/reception point (TRP) as the DMRS.