Digital Beamforming for 5G Link Robustness
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Solution Overview
Problem
Millimeter wave frequency bands used in 5G NR communications are susceptible to rapid channel variations and free-space pathloss, leading to beam failure issues due to the need for precise alignment of directional antennas, which increases latency and affects control layer procedures like initial access and handover.
Innovation Solution
Implementing digital beamforming in wireless devices, which allows for simultaneous direction tuning of reception beams using lower resolution ADCs to reduce power consumption and maintain link quality without beam handover, activated when analog beamforming fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If highly directional antennas with beam forming are used to achieve sufficient link budget in mmWave frequency bands, then link robustness is improved, but latency increases and control layer procedures are affected
Solution Approach 1:
The system performs preliminary beam failure detection by monitoring signal quality metrics (RSRP, SINR) and maintains a history of beam failures. When a threshold number of failures occur, the system proactively switches to digital beamforming before complete link failure, avoiding the latency of reactive beam handover procedures.
Solution Approach 2:
The system dynamically switches between analog beamforming and digital beamforming modes based on real-time beam failure conditions. The processor selectively activates digital beamforming for specific antenna elements when beam failure is detected, creating a flexible hybrid beamforming system that adapts to channel conditions without requiring full beam handover.
2Reliability
If precise alignment of transmitter and receiver beams is performed using beam management operations, then link budget is improved, but latency increases
Solution Approach 1:
The system performs preliminary detection of beam failure conditions by monitoring signal quality metrics and maintaining a history of failures. This early detection allows the system to switch to digital beamforming before complete link failure occurs, avoiding the time-consuming beam management operations required for full beam realignment.
Solution Approach 2:
The system changes the beamforming mode parameter from analog to digital when beam failure conditions are detected. This parameter change allows the system to maintain beam alignment without requiring complete beam management operations, as digital beamforming can compensate for misalignment through signal processing rather than physical antenna switching.
3Use of energy by moving object
If hybrid beamforming with lower resolution ADCs is used, then power consumption is reduced, but reception capability may be insufficient under low signal strength conditions
Solution Approach 1:
The system dynamically adjusts the beamforming mode based on signal strength conditions. During normal operation, analog beamforming is used for power efficiency. When beam failure is detected, the system switches to digital beamforming for the affected antenna elements, providing enhanced reception capability only when needed while maintaining overall power efficiency.
Solution Approach 2:
The system applies digital beamforming selectively to specific antenna elements that experience beam failure, rather than switching all elements to digital mode. This localized application of digital beamforming provides enhanced reception capability only where needed, maintaining power efficiency for elements that are functioning properly with analog beamforming.
Data Source
AI summary
Embodiment methods for managing communication with a base station may include a wireless device determining whether a beam received from the base station can be successfully received using analog beamforming, determining whether the beam from the base station can be received using digital beamforming in response to determining that the beam received from the base station cannot be successfully received using analog beamforming, and receiving the beam using the digital beamforming in response to determining that the beam can be received using digital beamforming.