HARQ Feedback Transmission in SPS Resources for XR Services
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing transmissions without corresponding grants for Extended Reality (XR) services, particularly in Semi-Persistent Scheduling (SPS) and Configured Grant (CG) transmissions, which affect system capacity and UE power consumption.
Innovation Solution
The implementation of procedures that allow User Equipments (UEs) to determine and transmit Hybrid Automatic Repeat Request (HARQ) feedback in different SPS resources and select UL resources based on configured grant occasions, enabling efficient resource allocation and aggregation across multiple SPS/CG configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple SPS configurations are configured for XR services, then system capacity is improved, but UE complexity increases due to needing to manage multiple configurations and resources
Solution Approach 1:
The patent segments the management of multiple SPS configurations by introducing a reference SPS configuration that serves as a template. Instead of managing all configurations independently, the UE uses the reference configuration to determine resource allocations for other configurations, reducing the management burden while maintaining support for multiple configurations to improve system capacity.
Solution Approach 2:
The reference SPS configuration serves multiple functions: it acts as a template for determining resources in other SPS configurations, provides a basis for HARQ feedback transmission decisions, and simplifies the UE's resource management algorithm. This multi-functionality reduces overall UE complexity while enabling efficient handling of multiple configurations.
2Ease of operation
If HARQ feedback is transmitted in the same SPS resource as the DL transmission, then feedback timing is simplified, but resource utilization efficiency decreases due to potential conflicts and wasted opportunities
Solution Approach 1:
The patent dynamically determines the HARQ feedback transmission resource based on the relationship between the current SPS resource and the reference SPS resource. When the SPS resource matches the reference configuration, feedback uses the associated UL resource; when it differs, feedback uses the UL resource associated with the reference configuration. This dynamic adaptation optimizes resource utilization while maintaining operational simplicity.
Solution Approach 2:
The reference SPS configuration acts as an intermediary that mediates between the current SPS resource and the UL resource for HARQ feedback. Instead of directly mapping current SPS resources to UL resources (which would be complex and conflict-prone), the reference configuration serves as an intermediate reference point that simplifies the mapping process and improves resource utilization efficiency.
3Reliability
If UE monitors all SPS resources for DL transmissions, then reception reliability is improved, but UE power consumption increases due to continuous monitoring requirements
Solution Approach 1:
The patent applies local quality by differentiating the monitoring behavior based on the specific SPS resource being evaluated. Instead of uniformly monitoring all SPS resources with equal intensity, the UE uses the reference SPS configuration to determine which resources require active monitoring for HARQ feedback transmission. This selective monitoring approach maintains reception reliability for critical resources while reducing power consumption by ignoring or passively monitoring non-critical resources.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for transmissions without corresponding grants. One method includes receiving a DL transmission in an SPS resource of a plurality of SPS resources within an SPS period corresponding to an SPS configuration of a plurality of SPS configurations; generating a HARQ feedback corresponding to the received DL transmission; determining an SPS reference corresponding to the DL transmission; and transmitting the HARQ feedback in an UL resource corresponding to the determined SPS reference, where the SPS reference includes a reference SPS configuration of the plurality of SPS configurations, a reference SPS resource (different than the SPS resource). of the plurality of SPS resources, or a combination thereof.