Dynamic PDSCH Repetition Aggregation for SPS Scheduling
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Solution Overview
Problem
Configuring semi-persistent scheduling (SPS) communications for physical downlink shared channels (PDSCH) in wireless systems is complex due to multiple configurations and dynamic signaling, leading to complexity in determining the number of repetitions.
Innovation Solution
Determine the number of PDSCH repetitions based on a rule that considers the priority between time domain resource allocation (TDRA) entries and configured repetition factors in SPS and PDSCH configurations, using DCI to dynamically indicate the number of repetitions or rely on aggregation factors when TDRA entries do not include the repetition number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple SPS configurations and dynamic signaling are used to configure PDSCH communications, then scheduling flexibility and reliability are improved, but the complexity of determining the number of repetitions increases
Solution Approach 1:
The patent introduces an intermediary rule that acts as a mediator between multiple SPS configurations and dynamic signaling. This rule systematically determines which configuration parameters take precedence in different scenarios, thereby resolving the complexity of determining repetition numbers while maintaining scheduling flexibility and reliability.
Solution Approach 2:
The patent dynamically changes the effective configuration parameters based on the relationship between SPS configurations and dynamic signaling. By conditionally selecting which parameters (aggregation factors, repetition numbers, etc.) are active in different scenarios, the system achieves both reliability and reduced determination complexity.
2Adaptability or versatility
If aggregation factors are configured in both PDSCH and SPS configurations, then scheduling flexibility is improved, but the complexity of determining the number of repetitions increases
Solution Approach 1:
The patent implements a dynamic mechanism where the effective aggregation factor is determined based on the presence and values of configuration parameters in both PDSCH and SPS configurations. The system dynamically selects which aggregation factor to use based on specific conditions, providing scheduling flexibility while managing configuration complexity through a systematic determination rule.
3Measurement precision
If TDRA entries are used to dynamically indicate repetition numbers, then scheduling accuracy is improved, but the complexity of handling multiple configurations increases
Solution Approach 1:
The patent applies preliminary action by pre-defining a set of rules that determine how TDRA entries interact with SPS configurations. These rules are established in advance and systematically guide the determination of repetition numbers, thereby improving scheduling accuracy while reducing the complexity of handling multiple configurations during actual operation.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described that support various configurations that enable repetitions of physical downlink shared channel (PDSCH) transmission according to a semi-persistent scheduling (SPS) configuration. A user equipment (UE) may receive downlink control information (DCI) associated with a PDSCH configuration and an SPS configuration. The UE may determine a number of PDSCH repetitions for a PDSCH transmission (e.g., an SPS PDSCH transmission) based on a rule associated with a priority between time domain resource allocation (TDRA) entries and configured repetition factors in an SPS configuration or a PDSCH configuration. The repetition number may be included in the TDRA entry, and the UE may receive a number of PDSCH repetitions based on a value of the PDSCH repetition number, or one instance of PDSCH may be received in each SPS period.