Secondary Cell Activation Through CSI-RS Beam Alignment
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Solution Overview
Problem
The current SCell activation mechanism in wireless communication systems fails to align transmit and receive beams for high frequency channel state information reference signals (CSI-RS), leading to activation failures.
Innovation Solution
A method where a terminal device reports receive beam direction information to a network device, allowing the network device to adjust the transmit beam direction of the CSI-RS resource, aligning it with the receive beam direction, thereby enabling valid CSI measurement and successful SCell activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current SCell activation mechanism is used, then the activation process is simple, but the transmit and receive beams of high frequency CSI-RS are misaligned causing activation failure
Solution Approach 1:
The terminal device performs receive beam sweeping before CSI measurement and reports the best receive beam direction to the network device in advance. This preliminary beam direction reporting enables the network device to configure the CSI-RS resource with the correct transmit beam direction before actual CSI measurement, ensuring beam alignment and preventing activation failure.
Solution Approach 2:
The terminal device feeds back receive beam direction information to the network device based on receive beam sweeping results. This feedback mechanism allows the network device to adjust and align the transmit beam direction of the CSI-RS resource with the terminal's receive beam direction, ensuring successful beam alignment for high frequency CSI-RS.
2Measurement precision
If beam sweeping is performed to align beams, then beam alignment accuracy is improved, but the activation time is extended
Solution Approach 1:
Beam sweeping and receive beam direction reporting are performed during the SCell configuration phase before activation. By completing beam alignment preparation in advance, the actual activation process only requires CSI measurement and reporting, significantly reducing the activation time while maintaining high beam direction accuracy.
Data Source
AI summary
A secondary cell activation method and an apparatus, the method including sending, by a terminal device, first indication information to a network device, where the first indication information indicates receive beam direction information of the terminal device, and where the receive beam direction information is associated with a channel state information reference signal (CSI-RS) resource for activating a secondary cell of the terminal device, receiving, by the terminal device, configuration information from the network device, where the configuration information configures the CSI-RS resource, and sending, by the terminal device, a first channel state information (CSI) report to the network device, where the first CSI report is obtained based on the CSI-RS resource, and where the first CSI report is used to activate the secondary cell.