Adaptive Receive Gain Control for Mixed LTE-NR Subframes
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Solution Overview
Problem
In communication systems with different sub-carrier spacings, such as LTE and NR, the constant receive gain across the entire service scheduling unit leads to AGC mismatch, causing quantization errors in the latter segment of the LTE subframe when communicating with UE from different systems.
Innovation Solution
An adaptive gain control method that adjusts the receive gain based on the sub-carrier spacing and service scheduling units, allowing for one or multiple adaptive gain controls to ensure the received power remains within the quantization range of the ADC, using techniques like merging service scheduling units or filling virtual data to align power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant receive gain is used across the entire service scheduling unit, then the device complexity is reduced, but quantization errors occur in the latter segment of the LTE subframe when communicating with UE from different systems
Solution Approach 1:
The patent divides the service scheduling unit into multiple segments based on different sub-carrier spacing configurations. Each segment is assigned an appropriate receive gain level, allowing the system to handle mixed LTE and NR transmissions without quantization errors. The segmentation enables precise gain control for each transmission type while maintaining overall system complexity at acceptable levels.
Solution Approach 2:
The patent implements dynamic receive gain adjustment that adapts to the specific sub-carrier spacing and service scheduling unit type being processed. Rather than using a static gain value, the system dynamically selects and applies appropriate gain levels based on the transmission characteristics, eliminating quantization errors while maintaining manageable device complexity through automated adaptation.
2Reliability
If the time length of service scheduling unit is reduced to accommodate larger sub-carrier spacing, then the system can overcome Doppler frequency shift effects, but the receive gain adjusted in the front segment becomes unsuitable for the latter segment data
Solution Approach 1:
The patent applies preliminary gain adjustment at the beginning of each service scheduling unit segment, setting the receive gain before data reception based on the known sub-carrier spacing and timing characteristics. This preliminary action ensures that the gain is properly configured for each segment before signals are processed, preventing quantization errors that would otherwise occur due to the shortened time length.
Solution Approach 2:
The patent applies different receive gain levels to different local segments of the service scheduling unit based on their specific characteristics. Each segment (LTE or NR) receives a locally optimized gain setting tailored to its sub-carrier spacing and time length, ensuring high precision signal processing for each segment while accommodating the overall reduced time length structure.
Data Source
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AI summary
Embodiments of the present disclosure provide an adaptive gain control method and apparatus, a storage medium, and an electronic apparatus. Signals from second user equipment and third user equipment are received by means of first user equipment. The first user equipment uses a first subcarrier spacing and a first-type service scheduling unit to communicate with the second user equipment, and the first user equipment uses a second subcarrier spacing and a second-type service scheduling unit to communicate with the third user equipment. The signals comprise the first-type service scheduling unit and the second-type service scheduling unit. The first user equipment performs adaptive gain control on the signals one or more times.