HARQ-ACK Timing Management During UL-DL Reconfiguration
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and TD-LTE, the existing HARQ-ACK feedback timing and uplink scheduling timing are not effectively managed during uplink and downlink reconfiguration, leading to issues such as non-continuous operation of HARQ processes and unavailability of timing during configuration changes.
Innovation Solution
A method is provided for determining HARQ-ACK feedback timing and uplink scheduling timing during UL-DL reconfiguration, involving the use of specific timing tables and modules in user equipment (UE) to manage synchronous HARQ processes, including starting or terminating HARQ processes based on configuration changes, and adjusting timing to ensure continuous operation and correct data combination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing HARQ-ACK feedback timing and uplink scheduling timing are used during UL-DL reconfiguration, then the system maintains simple timing management, but HARQ processes cannot operate continuously and timing becomes unavailable during configuration changes
Solution Approach 1:
The patent applies dynamics by making the timing configuration adaptive to UL-DL reconfiguration events. The system dynamically switches between first timing (during reconfiguration) and second timing (after reconfiguration) based on the current configuration state, allowing HARQ processes to maintain continuous operation while adapting to changing UL-DL configurations without requiring completely new timing management schemes
Solution Approach 2:
The patent applies preliminary action by using a first timing configuration specifically designed for the reconfiguration period before transitioning to the second timing configuration. This pre-planned timing arrangement ensures that HARQ processes can operate continuously during the transition, preventing timing unavailability and ensuring smooth configuration changes without disrupting ongoing transmissions
2Productivity
If the number of HARQ processes is increased to support more UL subframes, then uplink capacity is improved, but the complexity of managing HARQ process continuity during configuration changes increases
Solution Approach 1:
The patent applies segmentation by dividing HARQ process management into distinct phases: reconfiguration phase (using first timing) and normal operation phase (using second timing). This segmentation allows the system to handle multiple UL HARQ processes efficiently by applying different timing rules to different phases, reducing the overall management complexity while maintaining high uplink capacity
Solution Approach 2:
The patent applies parameter changes by adjusting timing parameters (first timing vs. second timing) based on the UL-DL configuration state. When UL-DL reconfiguration occurs, the system changes the timing parameter to ensure continuous HARQ operation, allowing the system to support increased numbers of HARQ processes without proportionally increasing management complexity
Data Source
AI summary
The present invention provides a method for determining HARQ-ACK feedback timing and uplink scheduling timing, and for managing the synchronous uplink HARQ process during uplink and downlink reconfiguration. The method comprises: when uplink and downlink reconfiguration is performed, determining whether at least one HARQ-ACK feedback associated with the last frame of a previous uplink and downlink configuration cannot be transmitted in the first frame of a current uplink and downlink configuration; and when the HARQ-ACK feedback cannot be transmitted in the first frame of the current uplink and downlink configuration, the HARQ-ACK feedback follows a new timing determined by the previous and the current uplink and downlink configuration.