Dynamic Subframe Configuration for LTE TDD Resource Adaptation
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Solution Overview
Problem
The existing 3GPP LTE TDD system struggles to dynamically adjust subframe configurations to effectively support both uplink-dominated and downlink-dominated services, resulting in inefficiencies with subframe waste, particularly in small cells and hotspots where service requirements change rapidly.
Innovation Solution
A wireless communication method where a base station sends configuration notification information to set radio frames with N−1 downlink subframes and one special subframe, and zero uplink subframes, allowing dynamic adjustment of subframe configurations to better match service requirements, and a terminal adjusts its configuration accordingly to enhance resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic subframes are used to support uplink-dominated services, then uplink transmission capability is improved, but downlink subframes become idle causing resource waste
Solution Approach 1:
The patent introduces a new subframe configuration (configuration 7) that allows dynamic switching between uplink and downlink modes. Specifically, subframes 1-9 can be dynamically configured as uplink or downlink subframes based on instantaneous service requirements, enabling the system to adapt to uplink-dominated services while minimizing resource waste through flexible reconfiguration
2Productivity
If dynamic subframes are used to support downlink-dominated services, then downlink transmission capability is improved, but uplink subframes become idle causing resource waste
Solution Approach 1:
The patent enables dynamic adaptation to downlink-dominated services by configuring subframes 1-9 as downlink subframes when needed. The base station can dynamically adjust the subframe configuration within radio frames 2-10 to match instantaneous service requirements, ensuring that downlink transmission capability is maximized while minimizing uplink subframe idle time
3Reliability
If traditional seven subframe configurations are used, then system compatibility is maintained, but flexibility to adapt to varying service requirements is limited
Solution Approach 1:
The patent introduces subframe configuration 7 as a universal configuration that can serve both uplink-dominated and downlink-dominated services. By allowing dynamic configuration of subframes 1-9 within radio frames 2-10, the system gains multi-functionality while maintaining compatibility with existing LTE TDD systems through the standardized radio frame structure
Solution Approach 2:
The patent enables dynamic change of subframe configuration parameters within radio frames 2-10 based on instantaneous service requirements. The base station can adjust the number and type of subframes (uplink, downlink, or special) in real-time, allowing the system to adapt to varying service demands while maintaining overall system compatibility
Data Source
AI summary
In one method, a base station sends configuration notification information to a terminal, so as to notify the terminal to set at least one radio frame meet a first subframe configuration, where the first subframe configuration includes N−1 downlink subframes, one special subframe, and zero uplink subframe. In another method, third radio frame configuration information is sent to a terminal, and second dynamic subframe indication information is sent to the terminal, so that at least one fourth radio frame is set to meet a third subframe configuration, or is set to meet a fourth subframe configuration, or at least one fifth radio frame is set to meet a fourth subframe configuration, where the third subframe configuration includes zero downlink subframe, zero special subframe, and N uplink subframes, and the fourth subframe configuration includes zero downlink subframe, one special subframe, and N−1 uplink subframes.