Deferred Semi-Persistent Scheduling Feedback Transmission
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Solution Overview
Problem
In wireless communications systems, semi-persistent scheduling feedback transmission often faces conflicts with other resources, leading to inefficiencies due to resource availability changes, particularly in scenarios where the likelihood of ACKs is high or subsequent uplink symbols are used for other information.
Innovation Solution
The implementation of on-demand transmission of deferred semi-persistent scheduling feedback, where user equipment (UE) receives control messages to temporarily override default configurations, allowing for non-deferral of feedback transmission when resources change, optimizing resource management by using second configurations based on traffic conditions and resource availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE defers feedback transmission when uplink symbol availability changes, then the feedback can be transmitted in available uplink resources, but the transmission time is delayed and resource utilization efficiency decreases
Solution Approach 1:
The patent applies dynamics by making the feedback transmission behavior changeable based on network conditions. The base station can dynamically indicate to the UE whether to defer feedback or not, allowing the system to adapt between reliability (deferring) and timeliness (not deferring) based on real-time resource availability and traffic conditions.
2Ease of operation
If the UE uses default configuration for feedback management, then the behavior is predictable and simple, but the system cannot adapt to changing network conditions and traffic patterns
Solution Approach 1:
The patent applies parameter changes by modifying the feedback management parameter (deferral behavior) based on network conditions. The base station changes the operational parameter of the UE from fixed default behavior to conditional behavior based on indicated network state, enabling adaptability while maintaining simplicity through base station control.
3Productivity
If the UE transmits feedback immediately when resources are available, then the throughput is maximized, but power consumption and processing overhead increase due to continuous monitoring and decision-making
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure and indicate the feedback management behavior before the actual transmission decision is needed. This allows the UE to follow predetermined instructions without continuously analyzing network conditions, reducing processing overhead and power consumption while maintaining optimal throughput.
4Productivity
If the base station provides detailed control messages for feedback management, then the resource allocation optimization is improved, but the signaling overhead and message complexity increase
Solution Approach 1:
The patent applies taking out by extracting only the essential control information needed for feedback management from the complete set of possible control parameters. The base station provides targeted indications specifically for feedback deferral behavior rather than comprehensive control messages, achieving optimization with minimal signaling overhead.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may be configured with a first configuration that the UE is to use for semi-persistent scheduling transmissions when availability of one or more uplink symbols in which the feedback is scheduled for transmission to a base station changes (e.g., due to a slot format change). The UE may be configured to defer transmission of the feedback until a subsequent uplink resource. The UE may receive, from the base station, an indication of a second configuration that the UE is to use for the semi-persistent scheduling transmissions when availability of one or more uplink symbols in which the feedback is scheduled for transmission to a base station changes. The UE may not defer transmission based on the second configuration.