Beamforming Training With Sounding Bursts for mmWave Beam Alignment
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing higher frequency bands like mmWave spectrum for cellular networks due to increased path loss and the need for effective beamforming techniques to enhance coverage and capacity.
Innovation Solution
Implementing a method for user device beamforming training in wireless networks through periodic common control signaling and aperiodic downlink sounding bursts, allowing user equipment to determine and train optimal receive and transmit beams using a predetermined beam sweeping pattern and reciprocal channel properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming training is implemented in mmWave networks, then signal quality and coverage are improved, but device complexity and training overhead increase
Solution Approach 1:
The beamforming training process is segmented into distinct phases: initial beam acquisition using wide beams, followed by refined beam training using narrower beams. This segmentation allows the system to first establish basic connectivity with lower complexity requirements, then progressively improve signal quality through more sophisticated beamforming techniques only when needed.
Solution Approach 2:
The patent implements preliminary beam alignment using wide beams and basic beam sweeping before initiating complex beamforming training procedures. This preliminary action establishes an initial connection and identifies rough beam directions, preventing the system from immediately attempting complex training sequences and thereby reducing overall device complexity while maintaining signal quality.
2Reliability
If periodic common control signaling is transmitted via multiple beams, then coverage and reliability are improved, but network overhead and resource consumption increase
Solution Approach 1:
The system transmits periodic common control signaling through multiple beams in a periodic manner, where beams are sequentially activated according to a predetermined pattern. This periodic action ensures that all user equipment can receive control signaling regardless of their spatial position, improving reliability while managing network overhead through time-division multiplexing of beam transmissions.
Solution Approach 2:
The common control signaling transmitted via multiple beams serves multiple functions simultaneously: it provides system information to all user equipment, enables beamforming training, and establishes initial connectivity. This multi-functionality reduces the need for separate dedicated signaling channels, thereby improving reliability without proportionally increasing network overhead.
3Measurement precision
If aperiodic downlink sounding bursts are used for beam training, then beam alignment precision is improved, but transmission overhead and latency increase
Solution Approach 1:
The system performs preliminary beam alignment using periodic common control signaling and wide beams before initiating aperiodic downlink sounding bursts. This preliminary action narrows down the search space for optimal beam directions, allowing the subsequent sounding bursts to focus on refined beam training with fewer transmissions, thereby improving alignment precision while reducing overall training latency.
Solution Approach 2:
The patent implements dynamic triggering of aperiodic downlink sounding bursts based on channel conditions, user equipment requirements, and current beam alignment status. Rather than transmitting sounding bursts at fixed intervals, the system dynamically adjusts their occurrence, transmitting them only when improved beam alignment is needed, thus achieving high precision when necessary while minimizing transmission overhead and latency during stable conditions.
Data Source
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AI summary
A technique is provided for beamforming training, including: transmitting, by a network node, common control signaling via a plurality of beams periodically according to a predetermined beam sweeping pattern, and transmitting, via a set of one or more beams in each of one or more sequential time-domain resources, an aperiodic downlink sounding burst to at least one user device to allow the at least one user device to perform beamforming training.