RedCap UE Measurement Prioritization for HD-FDD Uplink Collisions
Solution Overview
Problem
RedCap UEs face difficulties in communicating with wireless networks due to reduced capabilities, leading to potential interference and collisions with uplink transmissions when in proximity to neighboring cells with unsynchronized timing and frequency usage.
Innovation Solution
Implementing radio resource management prioritization by scheduling uplink transmissions to avoid collisions with SSB and CSI-RS measurements, including prioritizing SSB and CSI-RS related measurement symbols, and avoiding uplink transmissions during RSSI-based measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RedCap UE performs uplink transmissions without measurement prioritization, then uplink transmission continuity is maintained, but measurement accuracy deteriorates due to interference with reference signal measurements
Solution Approach 1:
The patent applies preliminary action by performing reference signal measurements (SSB/CSI-RS) before scheduling uplink transmissions. The UE identifies measurement opportunities in advance within SMTC windows and determines appropriate measurement timing, ensuring measurements are completed before uplink transmissions that could cause interference. This advance planning allows the UE to prioritize measurements without disrupting overall transmission continuity.
Solution Approach 2:
The patent implements dynamics by making the uplink transmission schedule adaptive based on measurement requirements. The UE dynamically adjusts transmission timing by applying measurement prioritization rules that temporarily suspend or delay uplink transmissions during SMTC windows when reference signal measurements are performed. This dynamic scheduling ensures measurement accuracy while maintaining overall system productivity through flexible resource allocation.
2Object-affected harmful factors
If RedCap UE schedules uplink transmissions without considering neighboring cell timing, then transmission scheduling simplicity is maintained, but interference with neighboring cells increases
Solution Approach 1:
The patent uses the SMTC window configuration as an intermediary mechanism to coordinate between serving cell and neighboring cell timing. The network provides SMTC window parameters that define measurement opportunities aligned with neighboring cell reference signal transmissions. The UE uses these pre-configured windows as a reference framework to schedule measurements and adjust uplink transmissions, simplifying the complexity by relying on network-provided timing guidance rather than requiring autonomous neighboring cell timing analysis.
3Measurement precision
If RedCap UE applies measurement prioritization during SMTC windows, then measurement accuracy is improved, but uplink transmission timing flexibility is reduced
Solution Approach 1:
The patent applies local quality by implementing measurement prioritization rules specifically within SMTC windows rather than across all uplink transmissions. The UE maintains normal transmission scheduling flexibility outside of SMTC windows while applying restrictive prioritization rules only during these defined measurement opportunities. This localized approach ensures measurement accuracy during critical SMTC windows while preserving overall transmission timing flexibility for non-critical periods.
Data Source
AI summary
Some aspects include an apparatus, method, and computer program product for radio resource management measurement prioritization for reduced capacity (RedCap) user equipment (UE). A RedCap UE may be use Half-Duplex Frequency Division Duplex (HD-FDD) for wireless communications. When performing communications with a network, the RedCap UE may make several measurements, including Reference Signal Received Power (RSRP), Signal to Interference and Noise Ratio (SINR), and Reference Signal Received Quality (RSRQ) measurements. To obtain these measurements, the RedCap UE may measure Synchronization Signal Block (SSB), Received Signal Strength Indicator (RSSI), and/or Channel State Information Reference Signal (CSI-RS) symbols. Difficulties may arise when a RedCap UE's serving cell signal timing is not synchronized with a neighboring cell. The RedCap UE may be configured to prioritize measurements over uplink transmissions. This prioritization may also include symbol buffers so that an overlap in uplink transmissions does not occur during a measurement.