UE Timing Difference Reporting for Carrier Aggregation
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Solution Overview
Problem
In LTE-A systems, excessive timing differences between primary and secondary cells lead to inefficient carrier aggregation, causing the network to decode data from secondary cells as interference, and the UE may stop uplink transmission, making it difficult for the network to predict and manage timing differences effectively.
Innovation Solution
The UE transmits information about its supported timing differences to the network, allowing the network to configure carrier aggregation based on the UE's capabilities, thereby enabling efficient uplink transmission even when timing differences exceed predetermined thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network configures carrier aggregation without considering UE timing difference capabilities, then carrier aggregation can be established, but uplink transmission efficiency deteriorates when timing difference exceeds thresholds
Solution Approach 1:
The UE performs timing difference measurements and reports supported timing differences to the network in advance, before carrier aggregation configuration. This allows the network to predict and prevent timing difference issues before they occur, ensuring reliable uplink transmission while maintaining carrier aggregation efficiency.
Solution Approach 2:
The UE continuously monitors timing differences between primary and secondary cells and provides feedback to the network about supported timing differences. This feedback mechanism enables the network to adjust carrier aggregation configuration dynamically, maintaining both aggregation efficiency and transmission reliability.
2Device complexity
If the network uses fixed timing difference thresholds, then configuration is simple, but the system cannot adapt to different UE capabilities and band combinations
Solution Approach 1:
The system transitions from fixed timing difference thresholds to dynamic, UE-specific timing difference reporting. The UE reports its actual timing difference capabilities based on hardware characteristics and band combinations, allowing the network to configure carrier aggregation optimally for each UE while maintaining manageable complexity through standardized reporting procedures.
Solution Approach 2:
The invention changes the timing difference parameter from a fixed network-determined value to a UE-reported capability parameter. This allows the system to adapt to different UE capabilities and band combinations while maintaining configuration simplicity through standardized reporting mechanisms defined in the specification.
3Adaptability or versatility
If the UE supports larger timing differences, then carrier aggregation flexibility increases, but the UE must handle more complex timing synchronization requirements
Solution Approach 1:
The UE autonomously measures timing differences, determines its supported timing difference capabilities, and reports this information to the network without requiring complex network-side timing management. This self-service approach increases carrier aggregation flexibility while keeping UE timing synchronization complexity manageable through automated measurement and reporting.
Data Source
AI summary
The present invention provides a method for carrier aggregation performed by a terminal in a wireless communication system, the method comprising: transmitting information regarding timing difference; and receiving carrier aggregation setting information that is set by means of the information regarding timing difference, wherein the information regarding timing difference is information regarding the timing difference between a primary cell and a secondary cell that can be supported by the terminal.