5G NR Scheduling Requests for Scalable TTI Cell Activation
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Solution Overview
Problem
Existing mobile communication systems face challenges in efficiently managing cell activation/deactivation with scalable transmission time intervals (TTIs) and configuring per-frequency measurement periods, particularly in next-generation systems like 5G NR, which affect transmission latency and require improved methods for power headroom reporting and synchronization signal management.
Innovation Solution
Implementing methods for activating/deactivating cells with scalable TTIs, configuring per-frequency measurement periods, and supporting single-antenna terminals in a mobile communication system using cell aggregation, along with enhanced scheduling requests and new radio link monitoring operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If cell aggregation with scalable TTIs is implemented, then transmission latency is reduced and scheduling efficiency is enhanced, but device complexity and system configuration complexity increase
Solution Approach 1:
The patent segments the cell aggregation system into multiple independent cells, each with its own configurable TTI length. This allows different cells to operate with different TTIs (e.g., 1ms, 0.5ms, 0.25ms) independently, enabling flexible latency optimization without requiring complete system reconfiguration. Each cell can be activated or deactivated independently based on service requirements.
Solution Approach 2:
The patent implements dynamic TTI configuration where the base station can adjust TTI lengths of different cells based on real-time traffic conditions and service requirements. The system dynamically selects appropriate TTI values from a predefined set, allowing adaptation to varying latency demands while maintaining system stability through controlled reconfiguration procedures.
2Measurement precision
If per-frequency measurement periods are configured, then measurement precision is improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
The patent applies local quality by configuring measurement parameters specific to each frequency/cell rather than using uniform measurement settings across all frequencies. Each cell can have its own measurement period, reference signal configuration, and reporting settings optimized for its specific characteristics, improving measurement accuracy while avoiding unnecessary signaling for cells with identical configurations.
Solution Approach 2:
The patent implements a unified measurement framework that can handle both cell-specific and frequency-common measurement configurations. The measurement configuration message structure supports optional cell-specific parameters, allowing the system to use generic configurations when applicable (reducing signaling) while enabling detailed per-cell configuration when needed (improving precision).
Data Source
AI summary
A communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT) are provided. The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method and apparatus of activating/deactivating cells with scalable transmission time intervals (TTIs) is disclosed.


