Downlink Semi-Persistent Scheduling HARQ Timing
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Solution Overview
Problem
Current wireless communication systems face limitations in flexibility and efficiency, particularly in managing downlink semi-persistent scheduling for hybrid automatic repeat request (HARQ) and retransmissions, which are crucial for meeting the latency and reliability requirements of ultra-reliable low-latency communications (URLLC) in 5G networks.
Innovation Solution
The implementation of downlink semi-persistent scheduling (SPS) mechanisms in user equipment (UE) and base stations, including advanced HARQ/retransmission designs, such as dynamic timing adjustments and redundancy version (RV) sequence management, to optimize resource allocation and conflict resolution in URLLC scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downlink semi-persistent scheduling is implemented for URLLC, then communication efficiency and flexibility are improved, but device complexity and scheduling management difficulty increase
Solution Approach 1:
The patent implements dynamic timing adjustments for HARQ retransmissions in downlink semi-persistent scheduling. The base station can dynamically modify the timing of retransmissions based on network conditions and URLLC requirements, allowing the system to adapt scheduling parameters in real-time rather than using fixed periodic schedules. This dynamic approach improves communication efficiency while managing complexity through controlled adaptability.
Solution Approach 2:
The patent employs parameter changes by allowing dynamic modification of HARQ timing parameters and redundancy version sequences. The base station can adjust timing offsets, retransmission intervals, and RV sequence selections based on current network state. This enables the system to optimize scheduling performance for URLLC by changing key parameters without fundamentally altering the semi-persistent scheduling framework, thus improving efficiency while containing complexity.
2Reliability
If dynamic timing adjustments and RV sequence management are implemented, then HARQ/retransmission management is improved, but processing complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring redundancy version sequences and timing parameters for HARQ retransmissions. The base station prepares multiple RV sequences and timing options in advance, so when retransmissions are needed, the system can quickly select from pre-prepared options rather than calculating everything in real-time. This preliminary preparation improves reliability by ensuring proper retransmission handling while reducing processing complexity during actual retransmission events.
Solution Approach 2:
The patent utilizes periodic action through the semi-persistent nature of the scheduling, where HARQ retransmissions follow periodic timing patterns once established. The system sets up periodic retransmission opportunities with configured timing relationships, creating predictable cycles for data transmission and retransmission. This periodic structure improves reliability through consistent timing while managing processing complexity by establishing regular, predictable schedules rather than requiring continuous real-time decision-making.
Data Source
AI summary
A user equipment (UE) is described. The UE includes receiving circuitry configured to receive system information comprising first information of first time domain resource assignment for a physical downlink shared channel (PDSCH). The receiving circuitry is also configured to receive a UE-specific radio resource control (RRC) signal comprising second information of second time domain resource assignment for a PDSCH. The receiving circuitry is also configured to perform, based on a detection of a physical downlink control channel (PDCCH), the PDSCH reception according to either the first information of the first time domain resource assignment or the second information of the second time domain resource assignment.