QCL Parameter Segmentation for Flexible Beam Switching
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Solution Overview
Problem
Current mobile communication systems face challenges in supporting high-speed data services due to resource shortages and the need for increased transfer rates, a large number of connection devices, very low end-to-end latency, and high energy efficiency, which existing techniques such as small cell enhancement and non-orthogonal multiple access do not adequately address.
Innovation Solution
A method for providing different quasi-co location (QCL) application times and defining delays in applying QCL indications in wireless communication systems, specifically through the use of transmission configuration indication (TCI) state information and physical downlink control channels (PDCCH) to manage beam switching and data transmission effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single QCL application time is used for all QCL parameters, then the system operation is simplified, but the system cannot provide different application times for different QCL parameters which is needed for flexibility in beam switching
Solution Approach 1:
The patent segments the QCL parameters into different groups (first QCL parameters and second QCL parameters) with different application times. The first QCL parameters (e.g., spatial parameters) use a first application time, while the second QCL parameters (e.g., delay spread, Doppler spread) use a second application time. This segmentation allows different timing treatments for different parameter types, providing flexibility while maintaining operational clarity.
Solution Approach 2:
The patent introduces dynamic timing behavior where the application time for QCL parameters is not fixed but depends on the parameter type. The system dynamically selects which application time to use based on whether the parameter is a spatial parameter or another type of QCL parameter, enabling adaptive beam switching strategies.
2Device complexity
If QCL indication is provided only in the current slot, then the timing is simplified, but beam switching cannot utilize historical indication information from previous slots
Solution Approach 1:
The patent applies preliminary action by allowing QCL indications to be provided in previous slots (latest slot prior to the current slot) and having those indications remain valid for beam switching. This enables the system to prepare beam configurations in advance and utilize historical indication information, improving data transmission efficiency without significantly increasing timing complexity.
3Adaptability or versatility
If RRC signaling and MAC CE reception are used without clear distinction, then the signaling mechanism is unified, but ambiguity arises in beam indication timing
Solution Approach 1:
The patent applies local quality by assigning different characteristics to different signaling mechanisms. RRC signaling is associated with the first QCL parameters and first application time, while MAC CE reception is associated with the second QCL parameters and second application time. This local differentiation eliminates timing ambiguity while preserving the flexibility of multiple signaling mechanisms.
Data Source
AI summary
The present specification provides a method for receiving data on the basis of quasi co-location (QCL) in a wireless communication system. More particularly, a data reception method performed by means of a terminal comprises the steps of: receiving transmission configuration indication (TCI) state information relating to at least one QCL indication with respect to a downlink reference signal (DL RS) from a base station by means of RRC signaling; receiving a physical downlink control channel (PDCCH), comprising downlink control information (DCI), on a first slot from the base station; and receiving a physical downlink shared channel (PDSCH) comprising data from the base station on the basis of one or more QCL indications. Therefore, the flexibility of the terminal during beam switching can be enhanced.