Reciprocity-Based Beamforming for Architecture-Aware UE
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Solution Overview
Problem
In wireless communications systems, there is a mismatch between the precoding scheme used by the base station and the demodulation mode or architecture at the user equipment (UE), leading to poor performance in wireless communications.
Innovation Solution
The described techniques involve signaling to coordinate a correlation between the precoding scheme used by the base station and the downlink signal demodulation mode used by the UE, where the UE transmits a capability message indicating its supported demodulation modes, and the base station precodes downlink signals based on this information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station uses a precoding scheme without knowing the UE's demodulation mode, then the base station can transmit downlink signals independently, but a mismatch occurs between the precoding scheme and the UE's demodulation mode, leading to poor communication performance
Solution Approach 1:
The UE feeds back its demodulation mode capability information to the base station through uplink signaling. This feedback mechanism enables the base station to adapt its precoding scheme to match the UE's actual demodulation capabilities, eliminating the mismatch and improving both communication efficiency and reliability
Solution Approach 2:
The base station performs preliminary actions by configuring the UE's demodulation mode before downlink signal transmission. By determining and configuring the appropriate demodulation mode in advance, the base station ensures that subsequent precoding operations are aligned with the UE's capabilities, preventing performance degradation
2Measurement precision
If the UE transmits SRS in full sounding configuration, then the UE can provide channel information for all antenna ports, but this may cause mismatch between the precoding scheme and the demodulation mode implemented at the UE
Solution Approach 1:
The patent segments the antenna ports into different groups or subsets, allowing the UE to transmit SRS for specific subsets rather than all antenna ports simultaneously. This segmentation enables the base station to apply different precoding schemes to different subsets, ensuring alignment with the UE's demodulation mode while maintaining measurement precision for the relevant ports
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may transmit, to a base station, a UE capability message indicating support for at least a first demodulation mode or a second demodulation mode. The first demodulation mode may correspond to a single demodulation procedure associated with a set of antenna ports at the UE, and the second demodulation mode may correspond to multiple demodulation procedures, each procedure associated with a respective subset of antenna ports at the UE. In some cases, the UE may flexibly switch between demodulation modes. The UE may receive, from the base station, one or more downlink signals via one or more downlink beams based on the indication of the first demodulation mode or the second demodulation mode. The UE may demodulate the one or more downlink signals based on the indicated (e.g., an active) demodulation mode.