Dynamic Processing Time Configuration for Carrier Aggregation Latency
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Solution Overview
Problem
In wireless communication systems, particularly in next-generation mobile communication systems like new radio access technology (NR) and LTE, there is a challenge in reducing packet data latency and efficiently managing multiple processing times or transmission time intervals (TTIs) during carrier aggregation, which affects uplink transmission efficiency.
Innovation Solution
The solution involves a method and apparatus that allow user equipment (UE) to operate with multiple processing times and support short TTIs in carrier aggregation, enabling efficient uplink transmission by coordinating data transmission across multiple nodes and reporting capability for shortened processing times, thereby optimizing TTI lengths and processing times for each carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a fixed UE processing time is assumed, then system complexity is reduced, but latency cannot be sufficiently reduced and adaptability to different numerologies is limited
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed UE processing time to a dynamic, flexible processing time that can be adjusted based on different numerologies and TTI lengths. The UE is configured with multiple processing times corresponding to different TTI lengths, allowing the system to adapt processing duration to specific transmission requirements, thereby reducing latency while managing complexity through structured configuration.
Solution Approach 2:
The patent implements parameter changes by introducing multiple processing time parameters (first processing time for first TTI length, second processing time for second TTI length) instead of a single fixed parameter. This allows the system to change processing time parameters according to different numerologies and transmission scenarios, enabling latency reduction while maintaining systematic control over the increased complexity.
2Adaptability or versatility
If multiple carriers are supported with the same TTI length, then device complexity is reduced, but adaptability to different numerologies and flexible TTI management is limited
Solution Approach 1:
The patent applies segmentation by dividing the carrier aggregation management into separate processing time configurations for different carriers. Each carrier can be independently configured with specific TTI lengths and corresponding processing times, allowing different numerologies to be supported across multiple carriers while managing complexity through structured, carrier-specific configuration rather than unified management.
Solution Approach 2:
The patent implements universality by creating a multi-functional processing time configuration system that can handle both same-TTI-length carriers and different-TTI-length carriers within a single framework. The UE is capable of supporting multiple processing times and applying them appropriately based on carrier-specific configurations, providing versatile adaptability while maintaining systematic control.
3Productivity
If longer processing time is used, then processing reliability is improved, but latency increases and uplink transmission efficiency decreases
Solution Approach 1:
The patent applies partial action by using different processing times for different carriers based on their specific requirements. Instead of uniformly applying the longest processing time across all carriers (which would ensure reliability but reduce efficiency), the system applies processing times proportionate to each carrier's TTI length and numerology, achieving sufficient reliability for each while maximizing overall uplink transmission efficiency.
Data Source
Figure 1~1(b)
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AI summary
A method by which a terminal supports a carrier aggregation and a short processing time in a wireless communication system, according to one embodiment of the present disclosure, comprises the steps of: reporting, to a base station, whether a terminal can support a short processing time when the carrier aggregation is configured; determining the processing time to be used by the terminal when a cross carrier aggregation is configured in the terminal; and performing an uplink transmission operation according to the determined processing time.