SSB ID to Beam Mapping for 5G UE Power Reduction
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficient beam management and neighbor cells monitoring, leading to increased power consumption, configuration volume, and reduced UE sleep time durations.
Innovation Solution
The implementation of a systematic and semi-deterministic SSB beam sweeping pattern that maps SSB IDs to physical SSB beams based on two-dimensional azimuth and elevation angles, allowing UEs to prioritize and downselect relevant SSB beams for efficient beam management and neighbor cells monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional beam management procedures are used without systematic SSB ID mapping, then UEs must monitor all SSB beams exhaustively, but this increases power consumption and reduces UE sleep time
Solution Approach 1:
The patent segments the full set of SSB beams into multiple groups based on their spatial coverage (azimuth and elevation angle ranges). Each group is assigned a group ID, and UEs only need to monitor SSB beams within their relevant groups rather than all beams exhaustively. This segmentation enables UEs to reduce monitoring scope and save power while maintaining reliable beam management for their operational area.
Solution Approach 2:
The patent applies local quality by tailoring the beam monitoring requirements to each UE's specific operational characteristics. Each UE is configured with a subset of SSB beam groups relevant to its location and movement pattern, allowing customized monitoring behavior that optimizes power consumption for each user's specific needs rather than applying uniform monitoring to all UEs.
2Reliability
If comprehensive SSB beam monitoring is performed, then beam management coverage is complete, but configuration volume and processing complexity increase
Solution Approach 1:
The patent divides the complete set of SSB beams into manageable groups based on spatial coverage characteristics. Each group is identified by a group ID and associated with specific azimuth and elevation angle ranges. This segmentation reduces configuration volume by allowing the network to transmit only the relevant group IDs to UEs rather than providing detailed beam-level configurations for all beams, thereby simplifying the configuration while maintaining comprehensive coverage.
Solution Approach 2:
The patent makes the beam group configuration universal by using a standardized grouping approach that applies across different network deployments and UE types. The group-based ID mapping mechanism serves multiple functions: it enables power saving, reduces configuration complexity, and maintains beam management coverage simultaneously, making the solution broadly applicable without requiring deployment-specific customization.
3Measurement precision
If UEs continuously monitor all SSB beams, then beam tracking accuracy is maintained, but UE sleep time is reduced
Solution Approach 1:
The patent segments SSB beams into spatial groups and configures UEs to monitor only the groups relevant to their current and predicted operational area. This allows UEs to maintain accurate beam tracking for their relevant beams while skipping monitoring of irrelevant beams, thereby extending sleep time without sacrificing tracking accuracy for the UE's operational sector.
Solution Approach 2:
The patent applies preliminary action by having the network pre-configure and broadcast the SSB group ID mappings before UE connection establishment. This advance preparation enables UEs to immediately start monitoring only the relevant beam groups without requiring extensive initial scanning or configuration exchange, thus reducing the time UE needs to be awake during the connection setup phase while maintaining accurate beam tracking.
Data Source
AI summary
Aspects presented herein may improve beam management and neighbor cell(s) monitoring related characteristics on a UE side, which may include improved power consumption, configuration volume reduction, and more robust and efficient beam tracking procedures for UEs receiving and monitoring SSBs transmitted by a base stations. In one aspect, a UE is configured to apply an SSB IDs classification based on a systematic mapping configuration that maps a set of SSB IDs to a plurality of SSB beams of a network entity, each SSB beam of the plurality of SSB beams being associated with one SSB ID of the set of SSB IDs and covering a range of azimuth angles and a range of elevation angles. Based on the mapping configuration and the semi-deterministic SSB beams sweeping pattern, the UE may classify SSB IDs into different categories and prioritize and deprioritize measurements for one or more SSB IDs.