PDCCH-Based TDD Subframe Reconfiguration for Fast UL/DL Adaptation
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Solution Overview
Problem
TDD wireless communication systems face challenges in dynamically adapting to varying UL/DL traffic patterns and inter-cell interference in heterogeneous networks, leading to reduced system capacity and performance.
Innovation Solution
A dynamic TDD UL/DL reconfiguration scheme is implemented using physical layer signaling, where an eNB determines periodic reconfiguration windows and transmits TDD UL/DL commands via PDCCH, employing a TDD-RNTI for CRC scrambling to ensure fast and reliable adaptation of UL/DL allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TDD UL/DL reconfiguration is implemented dynamically, then system capacity and adaptability to traffic patterns improve, but signaling complexity and processing overhead increase
Solution Approach 1:
The patent implements dynamic TDD UL/DL reconfiguration by allowing the eNB to change the uplink-downlink allocation pattern in real-time based on actual traffic conditions. The system transitions from static, pre-configured TDD patterns to dynamic, on-demand reconfiguration, enabling the network to adapt to varying traffic demands while maintaining the benefits of TDD time-division multiplexing.
Solution Approach 2:
The patent employs preliminary action through the use of configured reconfiguration windows and periodic scheduling. The eNB pre-configures reconfiguration windows with specific timing information, and the UE is prepared in advance to expect and apply new TDD configurations within these windows. This preliminary setup reduces the complexity of real-time signaling by establishing predictable timing frameworks.
2Loss of time
If fast TDD UL/DL reconfiguration is implemented, then latency is reduced and system responsiveness improves, but processing time and computational resources increase
Solution Approach 1:
The patent implements periodic action through the use of recurring reconfiguration windows that occur at predetermined intervals. Instead of continuous monitoring and reconfiguration, the system uses periodic windows during which TDD changes are applied. This periodic approach reduces processing overhead by concentrating computational resources into specific time windows rather than continuous operation, while still providing timely adaptation to traffic changes.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that reconfiguration commands are applied continuously within the reconfiguration windows and that the TDD configuration remains active and operational. The system avoids idle periods between reconfiguration cycles, maintaining continuous service while managing processing resources efficiently through the structured window-based approach.
Data Source
AI summary
An apparatus for use in a wireless communication network, comprising a processing resource configured to determine a time interval for periodic time division duplex (TDD) Uplink/Downlink (UL/DL) reconfiguration windows, generate a UL/DL reconfiguration command to indicate a dynamic TDD UL/DL allocation change, and encode the UL/DL reconfiguration command in a physical downlink control channel (PDCCH) data, and a radio front end (RF) interface coupled to the processing resource and configured to cause the encoded UL/DL reconfiguration command to be transmitted to a first of a plurality of wireless user equipment (UEs) in a first of the UL/DL reconfiguration windows, wherein the encoded UL/DL reconfiguration command is transmitted via a PDCCH to provide a fast TDD UL/DL reconfiguration.