Dynamic TDD Configuration Adaptation for LTE Traffic
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Solution Overview
Problem
Current LTE TDD systems face inefficiencies in resource utilization due to the inability to dynamically adapt to instantaneous traffic situations, leading to suboptimal uplink/downlink configuration and increased power consumption in user equipment (UE) and base station operations.
Innovation Solution
A method and apparatus for dynamically determining the time division duplex (TDD) uplink/downlink configuration by examining configuration indication bits in received downlink subframes, allowing for adaptive configuration periods and reducing power consumption by explicitly indicating link directions in non-fixed subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If system information is sent at the interval of at least 640ms for TDD configuration, then backward compatibility with legacy systems is maintained, but dynamic adaptation to instantaneous traffic situations is lost
Solution Approach 1:
The patent transforms the static semi-static TDD configuration into a dynamic configuration mechanism. The eNB can now change the TDD configuration dynamically based on instantaneous traffic conditions by sending indication information in downlink control information, allowing the system to adapt flexibly without being constrained by fixed periodic updates or legacy compatibility requirements.
Solution Approach 2:
The patent changes the parameter of configuration update frequency from fixed periodic (at least 640ms) to dynamic on-demand based on traffic conditions. The system can update configurations immediately when traffic patterns change, transforming the time parameter from a rigid constraint to a flexible adaptive variable.
2Productivity
If semi-static uplink-downlink configurations are used, then device complexity is reduced, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent segments the TDD configuration into two parts: fixed semi-static configuration for legacy compatibility and dynamic configuration indicators for optimization. This segmentation allows the system to maintain simple baseline operations while adding dynamic control capabilities only where needed, improving resource utilization without overwhelming complexity.
Solution Approach 2:
The patent introduces a feedback mechanism where the eNB monitors instantaneous traffic conditions and sends indication information back to UEs about the optimal TDD configuration. This feedback loop enables continuous optimization of resource utilization based on actual traffic patterns, transforming the system from open-loop to closed-loop control.
3Use of energy by moving object
If UE monitors all subframes for PDCCH detection, then link direction detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by having the eNB send advance indication information about the TDD configuration in downlink control information before the UE needs to determine link direction. This allows the UE to prepare and configure its reception parameters in advance, reducing the need for continuous monitoring and lowering power consumption while maintaining detection accuracy.
Solution Approach 2:
The patent introduces downlink control information as an intermediary carrier that conveys TDD configuration indications to UEs. This intermediary mechanism allows the network to efficiently communicate configuration changes without requiring UEs to continuously monitor all subframes, thereby reducing UE power consumption while maintaining accurate link direction knowledge.
Data Source
AI summary
The invention allows dynamic TDD UL/DL configuration that is able to adapt to an instantaneous traffic situation. The values of at least one uplink/downlink configuration indication bit in a predetermined region in a received downlink time division duplex subframe of wireless data transmission are examined. A time division duplex uplink/downlink configuration for a predetermined configuration period is determined based on the examined values.