Unified Flexible Frame Structure for 5G Radio Access Technology
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Solution Overview
Problem
Current 5G mobile telecommunications technologies face challenges in accommodating diverse deployment scenarios such as Rural and Urban Macro environments due to limitations in channel reciprocity, latency, and flexibility in radio access technology, particularly in high mobility scenarios and channel coherence times.
Innovation Solution
A unified and flexible frame structure for 5G radio access technology is introduced, featuring multiple partition types with unique numerologies, a common baseline sampling rate, and a multi-resolution frame schedule, enabling faster TDD switching, symbol-level reconfigurability, and higher UL sounding pilot periodicity, which supports channel reciprocity and high mobility scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a unified frame structure is used across all deployment scenarios, then device complexity is reduced, but adaptability to diverse scenarios (Rural, Urban Macro, Dense Urban, Indoor) deteriorates
Solution Approach 1:
The frame structure is segmented into multiple partition types (first partition type, second partition type, etc.), each optimized for specific deployment scenarios. The frame is divided into multiple slots, and each slot can be independently configured with different numerologies (subcarrier spacing, cyclic prefix length, symbol duration) to match channel conditions of different scenarios such as Rural, Urban Macro, Dense Urban, and Indoor environments.
Solution Approach 2:
The frame structure employs dynamic slot configuration where the number of slots per frame, slot duration, and numerology parameters can be dynamically adjusted based on deployment scenario requirements. This allows the system to adapt frame structures in real-time to match varying channel coherence times and mobility conditions across different scenarios.
2Loss of time
If longer slot durations are used, then latency is reduced for stable transmissions, but responsiveness to channel changes and mobility scenarios deteriorates
Solution Approach 1:
The frame structure is divided into multiple shorter slots instead of using a single long slot. Each slot can be independently configured with appropriate duration based on channel coherence time requirements. This segmentation allows the system to achieve low latency through shorter slot durations while maintaining overall transmission efficiency through proper slot aggregation and scheduling.
Solution Approach 2:
The system dynamically changes slot duration parameters and numerology configurations based on deployment scenario and channel conditions. For high mobility scenarios with short channel coherence times, shorter slot durations are used to enable frequent channel estimation and adaptation. For stable scenarios, longer slot durations can be used to reduce overhead and improve spectral efficiency.
3Speed
If faster TDD switching is implemented, then responsiveness to channel reciprocity changes is improved, but system complexity and synchronization requirements worsen
Solution Approach 1:
The TDD switching operates periodically with predefined uplink and downlink slot patterns. The frame structure includes periodic switching between uplink and downlink directions at slot boundaries, with switching periodicity aligned to channel coherence times. This periodic structure simplifies synchronization and control complexity compared to fully dynamic switching, while still achieving fast responsiveness to channel reciprocity changes.
Data Source
AI summary
Embodiments are disclosed for a new unified and flexible frame structure for 5G (5th generation) mobile telecommunications standard and related radio access technology (RAT). The disclosed embodiments use communication frames with multiple partition types and are able to span a wide range of 5G deployment scenarios in a flexible and scalable manner.