Adaptive TDD Frame Structure for Dynamic Traffic Scheduling
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Solution Overview
Problem
Modern wireless communications systems with fixed frame structures struggle to accommodate diverse traffic types with varying quality of service (QoS) requirements, particularly in terms of latency, leading to inefficient data transmission and increased interference.
Innovation Solution
The implementation of adaptive frame structures for time division duplex (TDD) systems, which allow for dynamic configuration of frame parameters such as sub-carrier spacing, TTI length, and cyclic prefix length, along with flexible switching types to accommodate different traffic types, enabling efficient communication in both uplink and downlink directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed frame structures are used for wireless communications, then resource allocation is simplified and interference is reduced, but the system cannot accommodate diverse traffic types with varying QoS requirements
Solution Approach 1:
The patent implements dynamic frame structure configuration where frame parameters (subcarrier spacing, TTI length, cyclic prefix length) can be adaptively adjusted based on traffic requirements. The system transitions from static fixed frames to dynamic configurable frames, allowing the same physical frame structure to serve multiple traffic types by modifying logical parameters rather than changing the fundamental device architecture.
Solution Approach 2:
The invention changes physical and logical parameters of the frame structure including subcarrier spacing, TTI length, and cyclic prefix length to accommodate different traffic types. By varying these parameters, the system can optimize performance for latency-sensitive traffic, throughput-oriented traffic, or interference-prone scenarios without requiring different hardware configurations.
2Loss of time
If fixed frame structures are used, then system simplicity is maintained, but latency performance deteriorates for diverse traffic types
Solution Approach 1:
The system dynamically adjusts frame parameters based on real-time traffic conditions and QoS requirements. For latency-sensitive traffic, the system can configure shorter TTI lengths and optimized subcarrier spacing to reduce transmission time, while maintaining longer parameters for other traffic types, thus achieving low latency without sacrificing overall system adaptability.
Solution Approach 2:
By changing frame structure parameters such as TTI length and subcarrier spacing, the system can optimize latency performance for specific traffic types. The patent enables parameter adaptation that directly impacts transmission time and processing delays, allowing the system to meet varying latency requirements across different service types.
3Productivity
If adaptive frame structures are implemented, then spectral efficiency and latency performance are enhanced, but system complexity increases
Solution Approach 1:
The patent implements dynamic frame structure adaptation that enhances spectral efficiency by optimizing resource allocation for current traffic conditions. The system dynamically configures frame parameters to match traffic patterns, improving spectrum utilization without requiring complex manual configuration management, as the adaptation is driven by automated network control based on observed traffic characteristics.
Solution Approach 2:
The invention utilizes parameter changes in frame structure to improve spectral efficiency. By adapting subcarrier spacing, TTI length, and cyclic prefix configurations based on traffic requirements, the system maximizes spectrum utilization. The complexity is managed through automated parameter selection algorithms that determine optimal configurations without requiring manual intervention for each parameter adjustment.
4Object-affected harmful factors
If fixed frame structures are used, then implementation is straightforward, but interference between different resources increases
Solution Approach 1:
The patent uses parameter changes in frame structure configuration to mitigate interference between different resources. By dynamically adjusting subcarrier spacing, TTI alignment, and cyclic prefix lengths based on traffic types and channel conditions, the system reduces inter-resource interference. The complexity of managing these parameters is offset by the interference reduction benefits, as automated algorithms select configurations that minimize harmful interactions between concurrent transmissions.
Data Source
AI summary
A time division duplex (TDD) scheduling interval communicating transmissions in a first direction may include one or more regions for communicating in a second direction, where the first direction is a transmit direction and the second direction is a receive direction, or vice versa. A radio frame may include TDD scheduling intervals with such regions and/or TDD scheduling intervals without such regions for wireless communication, and these TDD scheduling intervals may further be configured in accordance with different frame structure configurations, such as different scheduling interval lengths, subcarrier spacings or symbol durations.