Carrier Aggregation Indication Using L1 Cell Measurements
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Solution Overview
Problem
Existing carrier aggregation technologies face inefficiencies in the activation and addition of secondary cells, leading to delays and interruptions in data transmission due to suboptimal synchronization and measurement procedures.
Innovation Solution
Implementing an L1 measurement-based method for carrier aggregation, where a terminal performs L1 measurements on candidate primary and secondary cells and reports the results to a network device, which then provides indication information for adding and/or activating these cells, thereby optimizing the LTM procedure to reduce delays in establishing multi-carrier CA or DC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional carrier aggregation methods are used for adding and activating secondary cells, then the network can establish multi-carrier CA or DC, but significant delays and interruptions occur in data transmission due to suboptimal synchronization and measurement procedures
Solution Approach 1:
The patent applies preliminary action by performing L1 measurements on candidate primary and secondary cells before the actual addition and activation process. The terminal measures reference signal received power (RSRP) and signal-to-interference-plus-noise ratio (SINR) of candidate cells in advance, so that when the network decides to add secondary cells, the measurement results are already available, significantly reducing the time required for cell addition and activation.
Solution Approach 2:
The patent merges the L1 measurement process with the carrier aggregation establishment process. By integrating the measurement of candidate cells into the same procedural flow as cell addition and activation, and by combining the measurement of multiple cells (primary and secondary) in parallel, the system achieves more efficient resource utilization and reduces overall establishment time.
2Productivity
If L1 measurements are performed on candidate primary and secondary cells simultaneously, then the time for establishing multi-carrier CA or DC is significantly shortened, but the terminal must perform measurements on multiple cells which increases measurement complexity
Solution Approach 1:
The patent segments the measurement process into distinct components: measuring the candidate primary cell and measuring candidate secondary cells are separate operations. This allows the terminal to manage complexity by handling measurements in organized segments rather than as a single complex task, while still performing them simultaneously to reduce total establishment time.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal reports L1 measurement results (RSRP and SINR values) back to the network device. This feedback loop allows the network to make informed decisions about which secondary cells to add and activate, optimizing the process while keeping the terminal's measurement tasks manageable through targeted measurement and reporting.
Data Source
AI summary
Provided is a method for indicating CA. The method is performed by a terminal. The method includes: receiving a radio resource control (RRC) reconfiguration message from a network device, wherein the RRC reconfiguration message is used to carry Layer 1 (L1)/Layer 2 (L2)-triggered mobility (LTM) candidate configuration information, wherein the LTM candidate configuration information is used to indicate a configuration of a candidate primary cell; performing an L1 measurement on the candidate primary cell, and on a primary secondary cell and/or a secondary cell associated with the candidate primary cell to acquire an L1 measurement report; reporting the L1 measurement report to the network device; and receiving first indication information from the network device based on the L1 measurement report, wherein the first indication information is used to instruct the terminal to add and/or activate the primary secondary cell and/or the secondary cell for carrier aggregation.