Inter-frequency cell reselection parameter optimization
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Solution Overview
Problem
Wireless communication devices face inefficiencies in inter-frequency cell reselection procedures due to high power consumption and varying power availability, particularly in machine-type devices with different mobility levels, as they perform frequent measurements across multiple frequency bands even without inter-frequency handover opportunities.
Innovation Solution
The implementation of inter-frequency cell reselection parameters such as 'number of times to measure' (NTM), 'rest interval' (RI), and 'reselection candidate frequency set' (RCFS) to optimize the number of measurements and rest periods based on power levels and previous reselection success, allowing devices to dynamically adjust measurement frequency and prioritize power-saving strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless devices perform frequent inter-frequency measurements across multiple frequency bands, then cell reselection reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the measurement frequency adaptive rather than static. The system dynamically adjusts measurement parameters based on device state: mobile devices perform measurements more frequently while stationary devices perform fewer measurements. This resolves the contradiction by optimizing measurement frequency according to actual mobility conditions, maintaining reliability for mobile devices while reducing power consumption for stationary devices.
Solution Approach 2:
The patent changes key parameters (measurement frequency, number of frequency bands to measure) based on device mobility state. When a device is determined to be stationary, the system modifies measurement parameters to reduce the number of measurements and frequency bands monitored. This parameter adaptation directly addresses the contradiction by adjusting operational parameters to balance reliability requirements against power consumption constraints.
2Measurement precision
If wireless devices perform measurements across all available frequency bands, then measurement completeness is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the set of frequency bands into different groups based on priority and relevance. Instead of measuring all frequency bands uniformly, the system segments them into high-priority bands (measured frequently) and low-priority bands (measured less frequently or skipped). This segmentation maintains measurement completeness for critical bands while reducing overall complexity by excluding less important bands from frequent measurement cycles.
Solution Approach 2:
The patent implements partial action by performing measurements on only a subset of available frequency bands at any given time. Rather than exhaustively measuring all bands simultaneously, the system selects a partial set of bands based on current conditions, device capabilities, and priority criteria. This approach achieves sufficient measurement completeness for practical purposes while significantly reducing computational and processing complexity.
3Speed
If wireless devices perform inter-frequency measurements every DRX cycle, then response time to handover opportunities is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by scheduling measurements at specific intervals rather than continuously or at every DRX cycle. The system implements variable periodicity: mobile devices may measure at more frequent intervals while stationary devices use extended intervals between measurements. This periodic approach maintains adequate response time for handover opportunities while reducing average power consumption compared to continuous measurement at every DRX cycle.
Data Source
AI summary
A method, a device, and a non-transitory storage medium having instructions to store cell reselection parameters; select a first set of at least one of candidate frequency bands or candidate frequencies based on a first parameter of the cell reselection parameters that indicates candidate frequency bands or candidate frequencies from which can be selected for cell reselection; perform inter-frequency measurement; count a number of inter-frequency measurements performed; determine whether a cell reselection criteria has been satisfied based on one or more signal threshold values; select a new cell in response to a determination that the cell reselection criteria has been met; and determine whether to select a second set of at least one of one or more candidate frequency bands or one or more candidate frequencies indicated by the first parameter in response to a determination that the cell reselection criteria has not been met.