Configured Grant PUSCH Feedback for Unused Uplink Occasions
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Solution Overview
Problem
In wireless communications systems, configured grant physical uplink shared channel (CG-PUSCH) occasions often go unused due to insufficient data or resource conflicts, leading to inefficient resource utilization.
Innovation Solution
User equipment (UE) dynamically indicates unused CG-PUSCH occasions through uplink control information (UCI) messages, allowing the network to reallocate these resources for other signaling or devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE is pre-configured with a set of PUSCH occasions for transmitting uplink data, then the UE has guaranteed transmission opportunities, but the resources go to waste when the UE does not utilize all configured occasions
Solution Approach 1:
The UE provides feedback to the network by transmitting a UCI message that indicates which configured PUSCH occasions will be unused. This feedback mechanism allows the network to understand the UE's actual data transmission needs and adjust resource allocation accordingly, preventing resource waste while maintaining reliable transmission opportunities.
Solution Approach 2:
The system transitions from static resource allocation to dynamic resource indication. The UE dynamically indicates unused PUSCH occasions based on its current data buffer status, allowing the network to adapt resource allocation in real-time and optimize utilization without compromising the UE's guaranteed transmission opportunities.
2Reliability
If the network allocates multiple PUSCH occasions to a UE, then transmission reliability is improved, but resource utilization efficiency deteriorates when occasions remain unused
Solution Approach 1:
When the UE indicates that certain PUSCH occasions will be unused, the network recovers these resources by reallocating them to other UEs or purposes. This allows the system to maintain multiple configured occasions for reliability while actually utilizing the resources efficiently by discarding (not using) the occasions that would otherwise go waste and recovering them for other uses.
Solution Approach 2:
The configured PUSCH occasions serve multiple functions: they provide guaranteed transmission opportunities for the UE when needed, and when not needed, they can be reallocated to serve other UEs or purposes. This multi-functionality resolves the contradiction between maintaining reliable transmission opportunities and optimizing resource utilization efficiency.
3Productivity
If the UE transmits UCI messages indicating unused PUSCH occasions, then resource allocation efficiency is improved, but signaling overhead increases
Solution Approach 1:
The system extracts only the essential information needed for resource optimization - specifically, which PUSCH occasions will be unused - and transmits this compact indication through the UCI message. This extraction approach provides the network with sufficient information to reallocate resources efficiently without requiring extensive signaling about the UE's complete data status or transmission preferences.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receiving control signaling indicating an uplink configured grant including a set of physical uplink shared channel (PUSCH) transmission occasions. The UE may transmit a PUSCH message within a first PUSCH transmission occasion of the set of PUSCH transmission occasions. The UE may transmit an uplink control information (UCI) message indicating a second PUSCH transmission occasion of the set of PUSCH transmission occasions that will be unused by the UE, where the second PUSCH transmission occasion is based on a quantity of uplink traffic within a message buffer at the UE, the second PUSCH transmission occasion conflicting with a set of reserved resources, or both. The UE may then communicate with a network entity based on transmitting the UCI message, where the communicating includes refraining from transmitting messages within the second PUSCH transmission occasion.