Dynamic TDD Configuration Signaling for Flexible Wireless Networks

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Solution Overview

Problem

Current wireless communication systems face limitations in flexibility and efficiency, particularly in dynamic Time-Division Duplexing (TDD) configuration reconfiguration, which leads to high costs and network disruptions due to long delays and the need for system-wide synchronization, making it difficult to adapt to instantaneous changes in traffic load.

Innovation Solution

The implementation of systems and methods for dynamic TDD UL/DL configuration signaling, allowing for multiple reference configurations to be signaled, enabling faster reconfiguration and adaptive subframe allocation without the need for system-wide changes, using combinations of RRC and PHY signaling to support flexible TDD UL/DL reconfiguration cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional TDD configuration reconfiguration is used, then system-wide synchronization is maintained, but reconfiguration delay increases and flexibility decreases

Engineering Contradiction:

ImproveTDD configuration flexibilityVSAvoidReconfiguration delay

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent segments the TDD configuration signaling into two parts: a first TDD configuration signaled through existing RRC signaling for legacy compatibility, and a second TDD configuration signaled through enhanced RRC or MAC CE for dynamic adaptation. This segmentation allows different parts of the system to operate at different speeds and with different levels of flexibility, resolving the contradiction between maintaining synchronization and enabling fast reconfiguration.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic TDD configuration capabilities where the TDD UL/DL configuration can be changed rapidly based on traffic conditions. The second TDD configuration allows dynamic adaptation without requiring system-wide synchronization changes, enabling the system to respond to instantaneous traffic load changes while maintaining backward compatibility with static configuration requirements.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If traditional TDD reconfiguration is implemented, then system stability is maintained, but adaptability to traffic changes deteriorates

Engineering Contradiction:

ImproveTraffic load adaptationVSAvoidSystem synchronization stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by allowing different UEs or different cell groups to have different TDD configurations (first and second TDD configurations) based on their specific traffic requirements. This enables localized adaptation to traffic conditions without disrupting the global system synchronization, as each UE can independently apply its configured TDD settings while the overall system maintains stable operation.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces an intermediary mechanism through the second TDD configuration that mediates between the stable first TDD configuration and the need for dynamic adaptation. This intermediary layer allows traffic-adaptive reconfiguration while buffering the impact on system-wide synchronization, thus maintaining stability while improving adaptability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If dynamic TDD reconfiguration is enabled, then communication efficiency improves, but device complexity increases

Engineering Contradiction:

ImproveCommunication efficiencyVSAvoidConfiguration management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-configuring multiple TDD configurations (first and second TDD configurations) before they are needed. The UE receives and stores these configurations in advance through RRC signaling, so when traffic conditions change, the UE can quickly switch between pre-configured options without complex real-time calculations, thereby improving communication efficiency while managing device complexity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent manages complexity by changing parameters in a controlled manner - introducing a second TDD configuration parameter that supplements the existing first TDD configuration. The UE handles complexity through parameter management (storing and switching between configuration sets) rather than structural complexity, allowing efficient dynamic adaptation while keeping the device architecture relatively simple.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9219595B2Systems and methods for configuration signaling

Publication Date: 2015.12.22 SHARP KK

AI summary

A User Equipment (UE) for receiving time-division duplexing (TDD) uplink/downlink (UL/DL) configurations is described. The UE includes a processor and instructions stored in memory that is in electronic communication with the processor. The UE receives a first TDD UL/DL configuration for a cell and secondary configuration information that includes at least a second TDD UL/DL configuration for the cell.