LTE Downlink Subframe Configuration for High-Frequency Interference
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Solution Overview
Problem
LTE communications systems struggle to efficiently and flexibly support various network architectures, channel propagation conditions, and types of user equipment (UEs) due to increased Doppler spread and interference in high-frequency bands.
Innovation Solution
Implementing a base station and user equipment that utilize sub-physical and physical resource block pairs with reduced cyclic prefix lengths and increased subcarrier spacing, allowing for flexible subframe configurations and frequency band multiplexing to support diverse network architectures and UE types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high frequency bands are used to increase available spectrum, then network capacity increases, but channel propagation conditions deteriorate and interference increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple bandwidth parts (BWPs), each with different numerologies (subcarrier spacing, cyclic prefix length). This allows the system to divide the high-frequency spectrum into manageable segments that can be independently configured for different service types, mitigating the harsh propagation conditions by selecting appropriate segment configurations.
Solution Approach 2:
The patent changes key physical layer parameters (subcarrier spacing, cyclic prefix length, bandwidth) dynamically based on service requirements and channel conditions. By adjusting these parameters, the system can optimize performance across different frequency bands and propagation conditions, transforming the fixed-parameter limitation into a flexible adaptive system.
2Device complexity
If a fixed LTE frame structure is used, then system complexity is reduced, but adaptability to different network architectures and UE types is poor
Solution Approach 1:
The patent creates a universal frame structure that can serve multiple functions and scenarios. By introducing bandwidth parts with different numerologies within a single LTE frame, the system can simultaneously support heterogeneous networks (macro and small cells), different UE types (mobile and stationary), and various service requirements, all through one unified flexible framework.
Solution Approach 2:
The patent introduces dynamic configurability to the LTE frame structure through bandwidth part indicators and numerology selection. The system can dynamically adjust subcarrier spacing, cyclic prefix length, and bandwidth allocation based on real-time network conditions and service requirements, transforming the static frame structure into an adaptive system.
3Reliability
If standard LTE subcarrier spacing is used, then compatibility is maintained, but service delay increases under harsh channel conditions
Solution Approach 1:
The patent changes the subcarrier spacing parameter dynamically based on service requirements and channel conditions. By supporting multiple subcarrier spacing values (e.g., 15kHz, 30kHz, 60kHz) through different bandwidth parts, the system can reduce service delay for time-sensitive applications while maintaining standard compatibility for legacy services, effectively managing the time-compatibility trade-off.
Data Source
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AI summary
Embodiments of the present invention provide information sending and receiving methods and devices. The information sending method includes: determining, by a base station, a downlink subframe that is used to send first information to user equipment UE; and sending, by the base station, the first information to the UE by using the downlink subframe, where the downlink subframe is any one of a first subframe, a second subframe, or a third subframe, where the first subframe includes at least two sub-physical resource block pairs, the second subframe includes at least two physical resource block pairs, and the third subframe includes at least one sub-physical resource block pair and at least one physical resource block pair. According to the embodiments, an LTE communications system efficiently and flexibly supports various network architectures and various types of UEs.