Downlink Data Reception with TCI-Based CORESET Grouping for Directional LBT
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Solution Overview
Problem
The issue of over-protection due to Omni-directional Listen Before Talk (LBT) in unlicensed spectrum causes decreased spatial multiplexing efficiency in 3GPP 5G new radio (NR) networks, particularly in scenarios using beamforming on the millimeter wave band.
Innovation Solution
Implementing directional LBT and grouping control resource sets (CORESETs) based on Transmission Configuration Indicator (TCI) states to optimize downlink data reception by limiting PDCCH candidate monitoring to specific spatial regions and durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Omni-directional LBT is used in unlicensed spectrum, then fair coexistence with other wireless systems is achieved, but spatial multiplexing efficiency decreases
Solution Approach 1:
The patent segments the control resource sets into multiple groups based on TCI states, where each group corresponds to a specific spatial region or beam direction. This segmentation allows the UE to monitor only the relevant CORESET groups for directional LBT, rather than all CORESETs, thereby improving spatial multiplexing efficiency while maintaining fair coexistence through LBT
Solution Approach 2:
The patent applies local quality by associating different CORESET groups with different TCI states that represent different spatial characteristics. Each CORESET group is monitored with specific quality requirements based on its spatial region, allowing the system to optimize monitoring effort for directions where LBT success is more likely while still ensuring fair coexistence
2Reliability
If UE monitors all control resource sets, then no downlink data is missed, but processing overhead and power consumption increase
Solution Approach 1:
The patent divides the set of all CORESETs into multiple CORESET groups based on TCI state associations. The UE is configured to monitor only specific CORESET groups relevant to the current beam direction or spatial region, rather than all CORESETs. This segmentation reduces the number of PDCCH candidates the UE must decode, thereby reducing power consumption while maintaining reliable downlink data reception through the configured monitoring groups
3Reliability
If UE monitors all control resource sets, then no downlink data is missed, but processing complexity increases
Solution Approach 1:
The patent segments CORESETs into multiple groups based on TCI state associations, where each group corresponds to specific spatial regions or beam directions. The UE monitors only the configured CORESET groups rather than all CORESETs, reducing the number of PDCCH candidates to decode and process. This segmentation simplifies UE processing complexity while maintaining downlink data reception reliability through the configured monitoring groups
Solution Approach 2:
The patent changes the monitoring parameter from 'all CORESETs' to 'specific CORESET groups determined by TCI state associations'. This parameter change reduces the search space for PDCCH candidates and simplifies the UE's processing requirements while ensuring that all relevant downlink data can still be received through the configured CORESET groups
Data Source
AI summary
The present application relates to a method and apparatus for downlink data reception. one embodiment of the subject application provides a method, comprising: determining one or more control resource sets from a plurality of control resource sets in response to first Downlink Control Information (DCI) being received in at least one of the one or more control resource sets; and detecting second DCI only in the determined one or more control resource sets within a time duration.