Beam-Specific Cell Quality Filtering for Mobility Reporting
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Solution Overview
Problem
Current cellular systems face challenges in determining cell quality for reporting criteria, particularly in beam-formed systems where averaging across an entire cell may not be suitable, and beam-specific measurement reporting is desired to address issues like intra-cell mobility and beam level mobility.
Innovation Solution
Implementing a method that performs beam-specific measurements, calculates cell quality levels based on these measurements, and configures user equipment to apply both layer 1 and higher layer filtering to determine when to trigger measurement reports, using beam-specific and cell-specific trigger information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam-specific measurement reporting is implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the cell coverage area into multiple beams, each with its own reference signals. The UE performs separate measurements on each beam's reference signals and reports beam-specific quality metrics. This segmentation enables precise beam-level measurements while managing complexity through structured reporting mechanisms that focus on relevant beam information rather than exhaustive cell-wide measurements.
Solution Approach 2:
The patent implements local quality assessment by having the UE measure and report quality metrics specific to individual beams rather than averaging across the entire cell. Each beam's reference signals are measured independently, allowing the network to identify and select the best beam for each UE based on local conditions, thereby improving measurement precision for beam-specific optimization.
2Area of stationary object
If multiple beams are used to cover cell area, then coverage area is improved, but loss of time increases due to sequential sweeping
Solution Approach 1:
The patent employs periodic beam sweeping where the access point sequentially activates different sets of beams in periodic sweeping blocks. Each sweeping block covers a portion of the cell area, and multiple sweeping blocks are used to cover the entire cell. This periodic action allows the system to maintain comprehensive coverage while organizing the time-consuming beam sweeping process into manageable periodic intervals.
Solution Approach 2:
The patent implements preliminary beam identification through reference signals transmitted in sweeping blocks before actual data transmission. The UE performs beam level detection and separation using these preliminary reference signals, identifying suitable beams in advance. This preliminary action reduces the time required during actual communication by pre-establishing beam selections based on reference signal measurements.
3Measurement precision
If beam-specific filtering is applied, then measurement precision is improved, but loss of time increases due to additional filtering operations
Solution Approach 1:
The patent applies partial filtering by performing beam-specific filtering operations only on beams that meet certain criteria or are of particular interest, rather than filtering all beams uniformly. The network can configure the UE to apply filtering selectively based on beam quality thresholds or specific reporting requirements, thereby reducing overall filtering processing time while maintaining precision for critical beam measurements.
Data Source
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AI summary
The disclosure relate to an apparatus comprising means for: performing (710) beam-specific measurements of a plurality of beams of at least one cell; filtering (720) the beam-specific measurements, wherein the filtering of the beam-specific measurements is a layer 1 filtering or a physical layer filtering; applying (750) a selection function to the filtered beam-specific measurements, wherein the selection function comprises at least one of an average of more than one best reference signal received power based on the filtered beam-specific measurements, or cell specific weighting; determining a cell level quality based on at least one result of the applying of the selection function; additionally filtering, at a higher layer, based on the determination of the cell level quality; and obtaining a cell-specific quality value based on the additional filtering at the higher layer, wherein the at least one cell, with a number of beams with quality levels above a predefined threshold quality, is ranked higher than another cell with a lower number of beams with quality levels above a predefined threshold quality.