Holographic-MIMO Field Indication for Faster 2D/3D Beam Selection
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Solution Overview
Problem
Existing wireless communication systems face high latency due to beam sweeping procedures when user equipment (UE) fails to determine whether it is in a near-field or far-field relative to a wireless device, leading to unnecessary sweeping of both sets of beams.
Innovation Solution
A UE receives an indication of the field type from a wireless device, allowing it to select between a first set of two-dimensional beams and a second set of three-dimensional beams based on the field type, reducing the need for sweeping both sets and thus decreasing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs beam sweeping over both sets of beams (2D and 3D) to ensure comprehensive coverage, then the reliability of beam selection is improved, but the latency associated with beam sweeping increases
Solution Approach 1:
The base station performs preliminary determination of the field type (near-field or far-field) based on UE location information before the beam sweeping procedure. This preliminary action allows the UE to pre-select the appropriate beam weight vector set, eliminating the need to sweep through both sets and thereby reducing beam sweeping latency while maintaining reliable beam selection.
2Adaptability or versatility
If the UE sweeps through a larger number of beams to cover all possible field types, then the adaptability of the system is improved, but the complexity of the beam sweeping procedure increases
Solution Approach 1:
The system dynamically adapts the beam sweeping configuration based on the determined field type. When the field type is identified as near-field, the UE uses 3D beam weight vectors; when far-field, the UE uses 2D beam weight vectors. This dynamic adaptation maintains system versatility across different field types while simplifying the actual beam sweeping procedure by eliminating unnecessary beams.
3Measurement precision
If the UE performs complete beam sweeping without field type information, then the measurement precision of beam selection is improved, but the productivity of the communication system decreases
Solution Approach 1:
The base station performs preliminary field type determination using UE location information before the beam sweeping procedure. This preliminary action enables the UE to select the appropriate beam weight vector set in advance, maintaining measurement precision by using the correct beam set while improving productivity by reducing the number of beams that need to be swept.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A wireless device (e.g., a base station) may transmit, to a user equipment (UE), an indication of a field type of a field between the UE and the wireless device. The indication of the field type may include one or more bits indicating the field type, a measure indicating a likelihood that the field type includes a first field type as compared to a second field type, an indication that the first type is the same as a second field type configured at the UE, or any combination thereof. The UE may select between a first set of beam weight vectors and a second set of beam weight vectors based on the field type. The UE may communicate, with the base station, a reference signal using a beam generated using a first beam weight vector from the selected set.