Cell Reselection via Channel Load Evaluation in Unlicensed Spectrum
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Solution Overview
Problem
In wireless communication networks using unlicensed spectrum, user equipment (UE) faces challenges in efficiently selecting channels with low channel loads to avoid congestion and latency, as existing methods lack effective criteria for evaluating channel load and performing cell reselection.
Innovation Solution
The UE identifies channel loads for cells operating in unlicensed spectrum and performs cell reselection procedures, such as intra-frequency, inter-frequency, or inter-RAT reselection, based on threshold criteria, including signal level, cell quality, and cell load, to select cells with less than a threshold channel load, thereby reducing the likelihood of connecting to congested channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE performs cell reselection based on traditional criteria (signal level, cell quality) without channel load consideration, then the cell reselection procedure is simple, but the UE may connect to congested channels causing increased latency and reduced throughput
Solution Approach 1:
The patent applies preliminary action by having the UE evaluate channel load criteria before performing cell reselection. The UE identifies channel loads for candidate cells and uses this information to determine which cells to select, preventing connection to congested channels before the problem occurs. This advance evaluation of channel conditions allows the UE to avoid latency and throughput issues that would arise from connecting to busy channels.
2Reliability
If UE evaluates channel load for all candidate cells during reselection, then the UE can avoid congested channels, but the measurement and evaluation process becomes more complex and time-consuming
Solution Approach 1:
The patent applies local quality by having the UE evaluate channel load specifically for candidate cells that meet certain criteria rather than all possible cells. The UE focuses measurements on relevant candidate cells in the vicinity, assessing their individual channel load conditions to determine suitability for connection. This targeted approach improves paging reliability by avoiding congested cells while keeping measurement complexity manageable through selective evaluation.
3Loss of time
If UE uses channel load threshold criteria for cell reselection, then the UE can reduce latency by avoiding congested channels, but the reselection procedure requires additional thresholds and parameters
Solution Approach 1:
The patent applies parameter changes by introducing channel load as an additional evaluation parameter alongside traditional signal level and cell quality metrics. The UE compares channel load values against threshold criteria to determine whether to select a candidate cell. This parameter addition enables the UE to avoid congested channels and reduce latency, while the threshold-based approach keeps the implementation manageable by providing clear decision boundaries.
Data Source
AI summary
This disclosure provides systems, methods and apparatuses for channel load-based cell reselection procedures. In one aspect, a user equipment (UE) may identify a channel load and may perform a cell reselection procedure based on the channel load. For example, the UE may perform an intra-frequency cell reselection procedure, an inter-frequency cell reselection procedure, or an inter-radio access technology (RAT) cell reselection procedure.