Gap Configuration for Multi-TTI Carrier Aggregation
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Solution Overview
Problem
Current measurement specifications in mobile communication systems do not adequately support operations with different Transmission Time Intervals (TTIs), leading to potential misunderstandings and inefficient measurements, especially when 4G and 5G systems with varying TTIs are used simultaneously.
Innovation Solution
A user apparatus with a gap control unit that sets a common gap period for carriers with different TTIs, allowing for appropriate communication interruptions during measurements, and a base station with a gap indication unit that transmits specific gap operations to align or differentiate gap settings based on TTI lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gap setting is applied to all component carriers in CA/DC, then device complexity is reduced, but measurement efficiency deteriorates when carriers have different TTIs
Solution Approach 1:
The patent divides the gap configuration into carrier-specific settings, allowing each component carrier to have its own gap parameters tailored to its TTI length. This segmentation enables the system to handle different TTI configurations (e.g., 4G and 5G carriers) independently, resolving the contradiction between simplified single-gap configuration and efficient multi-TTI measurement operations.
2Reliability
If gap duration is extended to accommodate measurements on carriers with longer TTIs, then measurement coverage is improved, but communication interruption time increases
Solution Approach 1:
The patent applies local quality by configuring gap durations specifically matched to each carrier's TTI characteristics. Carriers with longer TTIs receive appropriately extended gap durations, while carriers with shorter TTIs use shorter gaps. This localized optimization ensures adequate measurement coverage for each carrier type without unnecessarily extending interruption time across all carriers.
Solution Approach 2:
The system dynamically adjusts gap configurations based on the specific TTI lengths of active component carriers. When 4G and 5G carriers are aggregated, the gap settings are adapted to accommodate the longer 5G TTI requirements, while maintaining efficient shorter gaps for 4G carriers when appropriate, thus balancing measurement coverage with communication continuity.
3Speed
If gap configuration is optimized for 5G carriers with shorter TTIs, then measurement speed is improved, but measurement accuracy on 4G carriers with longer TTIs deteriorates
Solution Approach 1:
The patent implements dynamic gap configuration that adapts to the specific TTI characteristics of each component carrier. For 5G carriers with shorter TTIs, the system configures shorter gap durations that enable faster measurement cycles. For 4G carriers with longer TTIs, the system extends gap durations to ensure sufficient measurement time and accuracy. This dynamic adaptation resolves the contradiction between measurement speed and accuracy across different carrier types.
Data Source
AI summary
A user apparatus is provided. The user apparatus performs communications with a base station in a mobile communication system in which at least two carriers with different TTIs are used. The user apparatus includes a gap control unit configured to set a gap that is a period in which the user apparatus does not perform communications with the base station. The gap control unit sets a gap common to a gap set for one of the two carriers as a gap for the other of the two carriers.