Beamforming Reciprocity Detection for 60 GHz Link Quality
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Solution Overview
Problem
In 60 GHz wireless communication systems, existing beamforming training protocols may assume beamforming reciprocity, leading to incorrect selection of receive sectors, resulting in low link quality or link failure when reciprocity is not present, especially in obstructed environments where reflective paths are used.
Innovation Solution
Implementing a reciprocity detection and utilization technique that includes a four-way handshake during beamforming training to determine if beamforming reciprocity exists, allowing devices to select reciprocal RX sectors only if reciprocity is confirmed, and performing additional training if not, to ensure optimal link quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming reciprocity is assumed in training protocols, then training efficiency is improved, but link quality deteriorates in non-reciprocal environments
Solution Approach 1:
The patent applies preliminary action by performing a reciprocity detection exchange before finalizing beamforming training. The initiator and responder exchange directional nulling feedback frames to detect whether beamforming reciprocity exists before committing to a training protocol, allowing the system to prepare appropriate receive sectors in advance based on the detected reciprocity condition.
Solution Approach 2:
The patent implements dynamics by making the beamforming training protocol adaptive based on detected reciprocity conditions. The system dynamically selects between different training approaches: using reciprocal assume sectors when reciprocity is detected, or performing full receive sector training when reciprocity is not detected, thereby optimizing both efficiency and reliability under different environmental conditions.
2Device complexity
If reciprocal RX sectors are selected without confirming reciprocity, then training complexity is reduced, but sector selection accuracy deteriorates
Solution Approach 1:
The patent applies feedback by implementing a reciprocity detection exchange where the initiator transmits directional nulling feedback frames and the responder provides directional nulling feedback in return. This mutual feedback mechanism allows both devices to confirm whether beamforming reciprocity exists before selecting receive sectors, ensuring sector selection accuracy is maintained while avoiding unnecessary full training procedures when reciprocity is present.
3Measurement precision
If full receive sector training is performed in all cases, then sector selection accuracy is maintained, but training time increases
Solution Approach 1:
The patent applies preliminary action by performing a quick reciprocity detection exchange before deciding whether to proceed with full receive sector training. This preliminary detection allows the system to avoid time-consuming full training procedures when reciprocity is present, while still maintaining accuracy by performing full training when reciprocity is not detected, thus optimizing the trade-off between training time and accuracy.
Solution Approach 2:
The patent implements dynamics by making the training process adaptive: the system dynamically adjusts the extent of training performed based on the detected reciprocity condition. When reciprocity is detected, the system uses the faster reciprocal training path; when not detected, it performs the more thorough receive sector training, thereby optimizing training time while maintaining accuracy requirements.
Data Source
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AI summary
Reciprocity detection and utilization techniques for beamforming training are described. In one embodiment, for example, an apparatus may comprise a station (STA) comprising logic, at least a portion of which is in hardware, the logic to perform an initiator transmit sector sweep (TXSS) to select an initiator transmit (TX) sector, perform a beamforming reciprocity test using the selected initiator TX sector, and determine whether to perform directional reception using a reciprocal initiator receive (RX) sector for the initiator TX sector based on an outcome of the beamforming reciprocity test. Other embodiments are described and claimed.