Rx Beam Selection for PDSCH Reception in 5G FR2
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Solution Overview
Problem
In 5G NR Frequency Range 2 (FR2) systems, the beam management for receiver (Rx) beams is not optimal for physical downlink shared channel (PDSCH) reception, particularly due to subarray imbalances and differing co-channel interference patterns between synchronization signals and PDSCH, leading to suboptimal performance.
Innovation Solution
A communication apparatus and method that performs beam management by training an initial Rx beam, selecting alternative Rx beams based on performance indicators, and conducting a round-robin test to determine the best beam for improved PDSCH reception, ensuring better error rates and signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam management is performed using SSB or TRS for PDSCH reception, then the receiver beam can be optimized according to spatial correlation matrix, but the beam management result is not optimal for PDSCH reception in some scenarios
Solution Approach 1:
The patent changes the parameter being optimized from spatial correlation matrix (used in traditional beam management) to actual PDSCH reception performance metrics. The system monitors PDSCH reception quality indicators and uses these performance parameters to select the optimal Rx beam, rather than relying solely on spatial correlation from SSB/TRS measurements.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors PDSCH reception performance and uses this feedback to dynamically select the best Rx beam. The beam selection is adjusted based on actual reception quality feedback, creating a closed-loop system that adapts to changing channel conditions and interference patterns.
2Device complexity
If a single Rx beam is used for PDSCH reception, then the beam management process is simple, but the performance deteriorates when subarray imbalances or co-channel interference occur
Solution Approach 1:
The patent transforms the static single-beam approach into a dynamic multi-beam system. Instead of fixing one Rx beam, the system maintains multiple candidate beams and dynamically selects the optimal one based on real-time PDSCH reception performance. This dynamic adaptation allows the system to handle subarray imbalances and interference by switching to alternative beams when needed.
Solution Approach 2:
The system changes from a single-beam configuration to a multi-beam configuration, altering the fundamental parameter of beam quantity. By maintaining multiple Rx beams with different spatial characteristics, the system can select the most appropriate beam for current channel conditions, thereby improving reliability without excessive complexity.
3Reliability
If multiple Rx beams are tested using round-robin test, then the optimal beam can be selected based on actual PDSCH performance, but the testing and selection process becomes more complex
Solution Approach 1:
The patent implements periodic round-robin testing of multiple Rx beams to determine their relative performance. Instead of continuous complex optimization, the system periodically evaluates candidate beams in a systematic rotating sequence and selects the best performer. This periodic approach balances accuracy with manageable complexity by not requiring continuous re-evaluation.
Data Source
AI summary
A communication apparatus comprises a radio transceiver and a modem processor. The radio transceiver is configured to transmit or receive signals. The modem processor is coupled to the radio transceiver and configured to perform operations comprising: performing a beam management, to train a first receiver (Rx) beam; receiving a physical downlink shared channel (PDSCH) according to the first Rx beam; selecting at least one second Rx beam according to a scenario, if a first performance indicator of the first Rx beam is lower than a previous first performance indicator of the first Rx beam by a first threshold; determining at least one second performance indicator of the PDSCH according to a round-robin test; selecting a third Rx beam from the at least one second Rx beam according to the at least one second performance indicator; and receiving the PDSCH according to the third Rx beam.