Adaptive Beam Weight Generation for Multi-TRP Wireless Communications
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Solution Overview
Problem
In wireless communications, user equipment (UE) faces challenges in generating coherent adaptive beam weights for communications with multiple transmission reception points (TRPs) due to timing alignment errors (TAEs) and carrier frequency offsets (CFOs, which hinder effective beam weight generation and result in reduced communication quality.
Innovation Solution
The UE performs reference signal measurements using coordinated reference signals from multiple TRPs, calculates adaptive beam weights by co-phasing energy from these signals, and projects them onto a beam weight codebook to generate beams for communication, with TRPs providing coordination information to align time-frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE uses multiple TRPs for communication, then communication reliability is improved, but timing alignment errors and carrier frequency offsets deteriorate beam weight generation accuracy
Solution Approach 1:
The patent introduces coordination information as an intermediary element that mediates between multiple TRPs and the UE. This coordination information includes timing alignment error (TAE) and carrier frequency offset (CFO) values that are exchanged between TRPs to enable the UE to generate accurate adaptive beam weights despite the presence of multiple TRPs with different timing and frequency characteristics
Solution Approach 2:
The patent implements a feedback mechanism where TAE and CFO values are measured and reported back to enable correction. The coordination information containing these error values is fed back from TRPs to the UE, allowing the UE to compensate for timing and frequency misalignments when generating adaptive beam weights, thus resolving the contradiction between using multiple TRPs for reliability and maintaining beam weight accuracy
2Reliability
If the UE generates adaptive beam weights for multiple TRPs, then communication quality is improved, but system complexity increases
Solution Approach 1:
The patent makes the single antenna panel serve multiple functions by enabling it to communicate with multiple different TRPs using different adaptive beam weights. The same hardware infrastructure (single antenna panel) is made multi-functional through the use of coordination information and adaptive beam weight generation, avoiding the need for separate antenna panels for each TRP and thus reducing system complexity while maintaining communication quality
3Device complexity
If the UE uses a single antenna panel for multiple TRPs, then device simplicity is maintained, but coherent beam weight generation becomes difficult
Solution Approach 1:
The patent changes the parameters used for beam weight generation by incorporating TAE and CFO values into the adaptive beam weight calculation process. Instead of using only channel state information, the system modifies the beam weight generation parameters to include timing and frequency compensation factors, enabling coherent beam weight generation from a single antenna panel while maintaining device simplicity
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The described techniques provide for a user equipment (UE) to adaptively generate beam weights for use in communications with multiple transmission reception points (TRPs) at a single antenna panel of the UE. For example, the UE may perform reference signal measurements using coordinated reference signals from the multiple TRPs. The UE may use the reference signal measurements to generate and select adaptive beam weights. The UE may generate beams using the selected beam weights to receive and/or transmit signaling to or from the multiple TRPs at a single antenna panel of the UE. In some cases, the TRPs may indicate coordination information, such as timing alignment errors (TAEs) and carrier frequency offsets (CFOs), such that the UE may receive the reference signals and co-phase energy from the multiple TRPs at an antenna panel using a same set of time-frequency resources.