Simultaneous Beam Sweeping for Wireless Device Training
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Solution Overview
Problem
Conventional beam training procedures for wireless devices with multiple antenna arrays require excessive overhead signaling, as each beam combination needs to be evaluated separately, leading to inefficient communication link establishment.
Innovation Solution
A method where a wireless device simultaneously sweeps through all beam combinations using one beam from each antenna array, determining the optimal combination based on reference signal measurements, thereby reducing the need for multiple transmissions of reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional beam training evaluates each beam combination separately with individual reference signal transmissions, then measurement precision is improved, but downlink overhead signaling increases
Solution Approach 1:
The patent merges multiple beam training operations into a single simultaneous sweep. The wireless device evaluates all beam combinations from multiple antenna arrays in one operation, combining what would traditionally require multiple separate reference signal transmissions into a single efficient process, thereby reducing downlink overhead while maintaining measurement accuracy
Solution Approach 2:
The patent implements continuous beam sweeping where the wireless device simultaneously sweeps through all beams from multiple antenna arrays without interruption. This continuous operation allows all beam combinations to be evaluated in one uninterrupted sequence, eliminating the need for repeated reference signal transmissions and reducing signaling overhead
2Adaptability or versatility
If multiple antenna arrays use multiple beams each for communication, then coverage and spatial multiplexing are improved, but beam training complexity increases
Solution Approach 1:
The patent introduces dynamic beam sweeping where the wireless device simultaneously switches through all beam combinations from multiple antenna arrays in a coordinated manner. This dynamic approach allows the system to adaptively evaluate all possible beam pairs without requiring complex static configuration, simplifying the training procedure while supporting multiple antenna arrays with multiple beams each
Solution Approach 2:
The patent segments the beam training process into independent simultaneous sweeps for each antenna array. Each antenna array's beams are swept through independently but simultaneously, allowing the complexity of evaluating all combinations to be divided into manageable parallel operations rather than requiring sequential evaluation of all pairs
3Measurement precision
If one CSI-RS is transmitted for every combination of WD RX beams, then measurement accuracy is improved, but transmission overhead increases
Solution Approach 1:
The patent merges the evaluation of all beam combinations into a single reference signal transmission event. Instead of transmitting separate CSI-RS for each beam combination, the system transmits one reference signal while the wireless device simultaneously sweeps through all its receiver beams, combining multiple measurements into one transmission and dramatically reducing reference signal overhead
Solution Approach 2:
The wireless device performs self-service by autonomously sweeping through all its receiver beams to evaluate multiple beam combinations against a single transmitted reference signal. This self-directed beam sweeping eliminates the need for the network to transmit multiple reference signals, as the device independently performs all necessary measurements using its own beam switching capability
Data Source
AI summary
There is provided mechanisms for beam training. A method is performed by a wireless device. The wireless device comprises at least two analog antenna arrays. Each of the at least two analog antenna arrays is configured to use at least two respective beams, one at a time. The method comprises sweeping through the beams for obtaining measurements of reference signals as transmitted by a network node by simultaneously using one beam from each analog antenna array such that beams from all the analog antenna arrays are simultaneously swept through for receiving the reference signals. The method comprises determining which combination of beams to use for communicating with the network node based on measurements of the reference signals as received for each beam and for each analog antenna array when sweeping through the beams. The combination of beams includes one beam from each antenna array.