Uplink Beam Determination via Spatial QCL Indication
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Solution Overview
Problem
In LTE communications systems, terminals cannot determine the appropriate beam for uplink signal transmission, limiting uplink coverage improvement, whereas in new radio (NR) systems, terminals can use beamforming for uplink but only in specific scenarios, necessitating a method to determine the correct beam for uplink channel transmission in various communication scenarios.
Innovation Solution
A communication method where a terminal receives indication information from a network device, including an identifier of reference signals, and determines the correspondence between the resource used to send a channel and a reference signal with a spatial quasi co-location (QCL) relationship, allowing it to determine the beam for uplink channel transmission, applicable to both beam reciprocity and non-reciprocity scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beamforming technology is introduced on terminal side in NR system, then uplink coverage is improved, but terminal cannot determine the appropriate beam for uplink channel transmission in most communication scenarios
Solution Approach 1:
The patent introduces indication information as an intermediary carrier that conveys reference signal identifiers from the network device to the terminal. This intermediary mechanism enables the terminal to determine the appropriate beam for uplink channel transmission by receiving and processing the indication information, thereby resolving the beam determination capability issue while maintaining improved uplink coverage.
Solution Approach 2:
The patent establishes a feedback mechanism where the network device provides indication information containing reference signal identifiers to the terminal. The terminal uses this feedback to determine the spatial QCL relationship and select the appropriate beam for uplink transmission, enabling adaptive beam selection across various communication scenarios while maintaining coverage improvement.
2Measurement precision
If terminal determines beam based on spatial QCL relationship, then beam accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by having the network device pre-determine and indicate the reference signal identifier to the terminal before the terminal needs to transmit the uplink channel. The terminal then uses this pre-provided information to directly determine the spatial QCL relationship and select the beam, achieving accurate beam determination without complex real-time calculations, thus balancing accuracy with reduced processing complexity.
Data Source
AI summary
This application provides a communication method, a terminal, and a network device. The method includes: receiving, by a terminal, indication information from a network device, where the indication information includes an identifier of at least one reference signal; and determining, by the terminal, that there is a correspondence between a resource used to send a first channel and a first reference signal of the at least one reference signal, where the first channel is a channel to be transmitted by the terminal, and there is a spatial quasi co-location (QCL) relationship between a port of the first channel and a port of the first reference signal, or there is a spatial QCL relationship between a port of a demodulation reference signal of the first channel and a port of the first reference signal.