FR2 UL Gap Configuration for Dynamic TDD Calibration
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Solution Overview
Problem
Current wireless communication systems, particularly those using time division duplex (TDD) with 5G NR, face challenges in enhancing Frequency Range 2 (FR2) coverage and signal quality due to limitations in power efficiency and system throughput, which are not adequately addressed by existing calibration methods.
Innovation Solution
The implementation of uplink (UL) gaps in wireless communication systems allows user equipment (UE) to perform calibration during designated periods, enabling power amplifier measurement, transceiver calibration, and adaptive transmit power management, thereby improving FR2 performance and overall system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UL gaps are implemented for UE calibration in FR2 TDD systems, then power efficiency and beamforming gains are improved, but system throughput and UL transmission continuity are reduced
Solution Approach 1:
The patent implements periodic UL gaps at predetermined intervals during which UE calibration is performed. This periodic approach allows the system to balance calibration needs with continuous data transmission, ensuring power efficiency improvements are achieved without permanently sacrificing throughput. The calibration occurs in scheduled bursts rather than continuously, minimizing impact on overall system productivity.
Solution Approach 2:
The patent performs UE calibration in advance during UL gaps before FR2 transmissions begin. By completing calibration activities beforehand, the system ensures optimal power amplifier performance and beamforming gains are established prior to data transmission, thereby improving power efficiency without requiring continuous calibration that would reduce throughput.
2Measurement precision
If UL gaps are implemented for UE calibration, then transceiver calibration accuracy is improved, but transmission time and latency are increased
Solution Approach 1:
The patent schedules UL gaps periodically rather than continuously, allowing calibration to be performed at optimal intervals. This ensures transceiver accuracy is maintained through regular calibration while minimizing the total time spent in calibration mode, thereby reducing the impact on transmission latency and maintaining high data throughput during active transmission periods.
3Reliability
If UL gaps are used for calibration, then beamforming gains are enhanced, but UL transmission continuity is disrupted
Solution Approach 1:
The patent implements UL gaps at predetermined periodic intervals to perform UE calibration that enhances beamforming gains. By confining calibration to specific periodic windows rather than continuous operation, the system maintains high beamforming reliability during calibration periods while ensuring uninterrupted UL transmission during data transfer periods, thus preserving transmission continuity overall.
4Power
If calibration is performed during UL gaps, then power amplifier performance is improved, but UL slot availability is reduced
Solution Approach 1:
The patent schedules UL gaps periodically to perform power amplifier calibration during specific predetermined intervals. This periodic approach allows the power amplifier to be calibrated at optimal intervals, improving its performance and efficiency, while ensuring that the majority of UL slots remain available for data transmission, thus minimizing the impact on overall UL slot availability and system productivity.
Data Source
AI summary
Systems and methods for implementing uplink (UL) gaps to facilitate user equipment (UE) calibration are disclosed herein. A UE determines one or more slot patterns of a slot configuration that is repeated during time division duplex (TDD) communication with a base station. The UE determines a UL gap periodicity (defining periods covering an integer number of repetitions of the slot configuration). The UE then performs UE calibration during one or more semi-persistently configured UL slots of a period of the UL gap periodicity that correspond to UL indication(s) in one or more of a common configuration, a dedicated configuration, and/or a slot format indication (SFI) downlink control information (DCI) for the slot pattern(s) of the slot configuration. Methods of identifying particular semi-persistently configured UL slots of a period to use for the UL gap are also discussed. UL slot indications from dynamic DCI are not used for UL gap purposes.