Beam Determination Using Reference Signal Sequences
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Solution Overview
Problem
In high-frequency millimeter wave and terahertz communications, the challenge of accurately and efficiently predicting and tracking beams is significant due to the high path loss and the need for narrow beam transmission.
Innovation Solution
A method and apparatus for determining a beam, where a terminal device receives beam indication information from a network device, which includes an associated reference signal identification sequence. This information allows the terminal device to determine the sending beam to be adopted by the network device or to determine its own sending beam, improving beam prediction and tracking efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If narrow beam transmission is used to deal with path loss in high-frequency communication, then transmission efficiency is improved, but beam prediction and tracking difficulty increases
Solution Approach 1:
The patent applies preliminary action by having the network device pre-determine and indicate a sequence of reference signal identifiers corresponding to multiple sending beams in advance. The terminal device uses these pre-indicated identifiers to determine receiving beams before actual data transmission occurs, enabling proactive beam alignment rather than reactive adjustment.
Solution Approach 2:
The patent introduces reference signal identifiers as an intermediary element that mediates between the network device's sending beams and the terminal device's receiving beams. These identifiers serve as a mapping key that simplifies the complex beam alignment process, allowing the terminal to determine appropriate receiving beams through identifier association rather than direct beam measurement and selection.
2Measurement precision
If beam indication information includes reference signal identification sequence, then beam determination accuracy is improved, but information processing complexity increases
Solution Approach 1:
The patent segments the beam indication process into distinct components: the network device determines a sequence of reference signal identifiers, each identifier corresponding to a specific sending beam. The terminal device processes these identifiers sequentially to determine receiving beams for different time periods or transmission occasions, breaking down the complex beam management into manageable discrete units.
Solution Approach 2:
The network device performs preliminary determination of the reference signal identifier sequence and transmits this information to the terminal in advance. This pre-computation and pre-indication approach transfers the computational burden to the network device, which has greater processing capabilities, while the terminal device benefits from simplified processing using the pre-provided identifier sequence.
Data Source
AI summary
A method for determining a beam includes receiving beam indication information sent by a network device. The beam indication information indicates an associated reference signal identification sequence within a specified time period; an associated reference signal identifier in the associated reference signal identification sequence indicates a sending beam to be adopted by the network device; or an associated reference signal identifier in the associated reference signal identification sequence is for the terminal device to determine a sending beam of the terminal device.