Wireless Apparatus Multi-TRP Beamforming via Segmented Channel Estimation
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Solution Overview
Problem
Existing wireless communication systems struggle to efficiently receive a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) from multiple transmission and reception points (TRPs) due to limitations in channel estimation and beamforming.
Innovation Solution
A wireless communication apparatus is designed to receive reference signals from multiple TRPs, estimate channels for multiple subcarriers, determine beamforming parameters based on channel capacity, and adjust the reception beam to optimize the reception of PDSCHs from multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a terminal receives reference signals from multiple TRPs and performs channel estimation for each, then the ability to receive PDSCH from multiple TRPs is improved, but the complexity of channel estimation and beamforming increases
Solution Approach 1:
The patent divides the channel estimation process into separate operations for each TRP. The terminal performs channel estimation for the first TRP using a first reference signal, and separately for the second TRP using a second reference signal. This segmentation allows the terminal to handle multiple TRPs independently, managing the complexity by treating each TRP as a separate entity rather than attempting to process all TRPs simultaneously as a single complex system.
Solution Approach 2:
The patent introduces a new dimension of TRP identification by using different physical layer signatures (such as different cyclic shifts or orthogonal cover codes) for reference signals from different TRPs. This dimensional differentiation allows the terminal to distinguish and process references from multiple TRPs without increasing the fundamental complexity of the estimation algorithm itself,而是 adding a new layer of identification.
2Reliability
If beamforming parameters are optimized for each TRP separately, then the reception quality of PDSCH from each TRP is improved, but the processing time and complexity increase
Solution Approach 1:
The patent performs channel estimation using reference signals before the actual PDSCH reception. By estimating the channel characteristics in advance using the transmitted reference signals from each TRP, the terminal prepares the necessary beamforming parameters beforehand. This preliminary action allows the terminal to have beamforming parameters ready when the PDSCH arrives, avoiding time-consuming optimization during the actual data reception phase.
3Reliability
If the terminal uses multiple reference signals from different TRPs for channel estimation, then the spatial diversity is improved, but the difficulty of distinguishing and processing these signals increases
Solution Approach 1:
The patent assigns different local qualities or characteristics to reference signals from different TRPs through the use of physical layer signatures. Each TRP's reference signal is modulated with a unique signature (such as a specific cyclic shift or orthogonal cover code), creating distinct local characteristics that allow the terminal to easily distinguish and process signals from different TRPs without confusion.
Data Source
AI summary
A wireless communication apparatus for supporting communication with multiple transmission and reception points (TRPs) includes a radio frequency integrated circuit (RFIC) configured to receive a first reference signal from a first TRP and a second reference signal from a second TRP, and processing circuitry configured to estimate channels of a plurality of subcarriers based on at least one of the first reference signal or the second reference signal, determine a beamforming parameter based on the estimated channels, the beamforming parameter being determined based on a capacity of an effective channel between the wireless communication apparatus and both the first TRP and the second TRP, and adjust a reception beam based on the beamforming parameter, and the RFIC being configured to receive a first physical downlink shared channel (PDSCH) from the first TRP through the adjusted reception beam, and receive a second PDSCH from the second TRP.