Dynamic TDD UL/DL Configuration HARQ Timing Continuity
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Solution Overview
Problem
Current LTE TDD systems face inefficiencies in radio resource utilization due to fixed UL/DL configurations, leading to issues with HARQ timing linkage disruptions during configuration changes, which affect both downlink and uplink transmissions.
Innovation Solution
The method involves dynamically reconfiguring TDD UL/DL configurations based on HARQ ACK/NACK indicators, allowing for flexible changes while maintaining HARQ timing continuity by limiting permissible configuration combinations and using adaptive PUSCH retransmissions to ensure seamless transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fixed UL/DL configurations are used in LTE TDD systems, then system stability is maintained, but radio resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements dynamic TDD UL/DL configuration changes, allowing the system to transition from fixed to adaptive configurations. The base station can dynamically adjust UL/DL configuration based on traffic conditions while maintaining HARQ timing relationships, thereby improving radio resource utilization efficiency without compromising system stability.
2Adaptability or versatility
If dynamic configuration changes are implemented, then configuration flexibility is improved, but HARQ timing linkage disruptions occur
Solution Approach 1:
The patent applies preliminary anti-action by pre-planning HARQ timing relationships before configuration changes. The system identifies permissible configuration combinations that maintain valid HARQ timing, and selects target configurations that do not disrupt existing HARQ processes, thereby preventing timing linkage disruptions before they occur.
Solution Approach 2:
The patent introduces configuration combination tables as intermediaries that map source configurations to permissible target configurations. These tables serve as mediators that ensure configuration changes maintain valid HARQ timing relationships, acting as a bridge between dynamic configuration needs and HARQ timing requirements.
3Productivity
If configuration changes are made to improve resource efficiency, then productivity increases, but transmission delays increase due to HARQ disruptions
Solution Approach 1:
The patent performs preliminary identification of permissible configuration combinations before actual configuration changes. By pre-determining which target configurations maintain valid HARQ timing relationships, the system avoids configuration changes that would cause HARQ disruptions and subsequent retransmissions, thereby preventing time loss.
Data Source
Figure 1A~1B
Figure 2
Figure 3~4
AI summary
Systems, methods, and apparatuses are directed to reconfiguring a time division duplex (TDD) uplink/downlink (UL/DL) configuration. A first TDD UL/DL configuration can be identified for a first radio frame. A second TDD UL/DL configuration can be identified for a second radio frame adjacent the first radio frame. The second TDD UL/DL configuration can be identified based, at least in part, on one or more subframes of the second TDD UL/DL configuration that can communicate hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) indicators for corresponding subframes of the first TDD UL/DL configuration.