Terminal Device PDSCH Scheduling Timing Overlap Handling
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Solution Overview
Problem
Existing communication systems, particularly in LTE and NR, face challenges in efficiently managing the transmission and reception of PDSCH (Physical Downlink Shared Channel) due to complexities in scheduling and resource allocation.
Innovation Solution
The proposed solution involves a method for the terminal apparatus and base station apparatus to efficiently manage PDSCH transmission/reception by configuring serving cells for carrier aggregation, using dynamic scheduling and Semi-Persistent Scheduling (SPS), and ensuring proper timing requirements for PDCCH (Physical Downlink Control Channel) to effectively schedule PDSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic scheduling and Semi-Persistent Scheduling (SPS) are used for PDSCH transmission, then resource allocation flexibility and system adaptability are improved, but scheduling complexity and device complexity increase
Solution Approach 1:
The patent segments the scheduling mechanism into two distinct modes: dynamic scheduling for flexible resource allocation and Semi-Persistent Scheduling (SPS) for periodic traffic patterns. This segmentation allows the system to apply different scheduling strategies to different traffic types, improving overall flexibility while managing complexity through specialization.
Solution Approach 2:
The patent implements dynamic switching between scheduling modes based on traffic conditions and QoS requirements. The network can activate or deactivate SPS configurations dynamically, and switch between dynamic and semi-persistent scheduling based on real-time needs, making the system adaptable without permanently increasing complexity.
2Productivity
If multiple serving cells are configured for carrier aggregation, then system capacity and resource utilization are improved, but timing synchronization and scheduling coordination become more difficult
Solution Approach 1:
The patent applies universal timing reference principles across multiple serving cells in a carrier aggregation configuration. By establishing a common timing relationship framework that can be applied to any number of cells, the system achieves multi-cell coordination without proportionally increasing complexity. The same timing principles are reused across all aggregated cells.
Solution Approach 2:
The patent implements feedback mechanisms where the network monitors timing synchronization status across aggregated cells and adjusts scheduling decisions accordingly. This feedback loop enables the system to maintain timing coordination in multi-cell scenarios by detecting and correcting synchronization drift, managing complexity through active monitoring and adjustment.
3Reliability
If PDCCH timing requirements are strictly enforced for scheduling PDSCH, then transmission reliability is improved, but scheduling latency and time efficiency may worsen
Solution Approach 1:
The patent applies preliminary action by pre-configuring SPS resources and timing parameters in advance based on predicted traffic patterns and QoS requirements. This allows the system to prepare scheduling decisions beforehand, ensuring timing requirements are met without last-minute delays, thus maintaining reliability while reducing actual scheduling latency.
Solution Approach 2:
The patent dynamically adjusts timing parameters such as K0 (offset between PDCCH and PDSCH) based on current system conditions, buffer status, and QoS requirements. By changing these parameters adaptively rather than using fixed values, the system can optimize the balance between meeting timing requirements for reliability and minimizing scheduling latency for efficiency.
Data Source
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AI summary
A terminal apparatus includes a receiver configured to receive, in one downlink BWP of one serving cell, a first PDSCH corresponding to a configured downlink assignment, and a receiver configured to receive, in the one downlink BWP, downlink control information to be used to schedule a second PDSCH on a PDCCH, and, in the one downlink BWP, in a case that a duration of the first PDSCH corresponding to the configured downlink assignment overlaps a duration of the second PDSCH corresponding to the PDCCH, a first downlink symbol of the first PDSCH is expected to not be earlier than a first (next) downlink symbol at which a CP begins after a predetermined period of time after a last symbol of the PDCCH.