Cross-Carrier Beam Application Time Determination
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Solution Overview
Problem
In new radio (NR) technologies, determining the application time of a cross-carrier indicated beam is challenging due to fast falling high-frequency channels, making it difficult for terminal devices to accurately receive beams corresponding to another carrier based on the first carrier.
Innovation Solution
A method involving a terminal device that receives downlink control information (DCI) on a physical downlink control channel (PDCCH) of a first carrier, sends indication information to indicate the receiving state, and determines the application time of the beam corresponding to a designated resource on a second carrier based on the sending time point of the indication information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam-based sending and receiving is used to ensure coverage area in high-frequency channels, then coverage reliability is improved, but the terminal device cannot accurately determine the application time of cross-carrier indicated beam
Solution Approach 1:
The terminal device sends HARQ feedback information to the network device, and the network device determines the application time of the indicated beam based on this feedback. This feedback mechanism enables accurate timing synchronization for cross-carrier beam indication, resolving the timing determination inaccuracy while maintaining coverage reliability through beam-based transmission
Solution Approach 2:
The HARQ feedback information acts as an intermediary signal between the terminal device and network device to convey timing information. The network device uses this intermediary feedback to calculate and determine the precise application time of the cross-carrier beam, solving the timing synchronization problem without compromising the beam-based coverage reliability
2Adaptability or versatility
If DCI on PDCCH of first carrier is used to indicate beam for second carrier, then cross-carrier beam indication is achieved, but terminal device cannot accurately determine application time
Solution Approach 1:
The terminal device sends HARQ feedback information to the network device, and the network device determines the application time of the indicated beam based on this feedback. This feedback mechanism enables accurate timing synchronization for cross-carrier beam indication, resolving the timing determination inaccuracy while maintaining coverage reliability through beam-based transmission
Solution Approach 2:
The terminal device sends HARQ feedback information in advance before the beam application time. The network device uses this preliminary feedback to determine the application time, allowing the system to pre-synchronize timing for cross-carrier beam indication and ensure accurate beam application
Data Source
AI summary
A method for determining an application time of a beam is performed by a terminal device. The method includes: receiving downlink control information (DCI) based on a physical downlink control channel (PDCCH) of a first carrier, wherein the DCI is configured to indicate a beam corresponding to a designated resource on a second carrier; sending indication information, wherein the indication information is configured to indicate a receiving state of the DCI; and determining an application time of the beam corresponding to the designated resource according to a sending time point of the indication information.