UE Uplink Rescheduling in Next Available Slots After Resource Collisions
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Solution Overview
Problem
In wireless communication systems, uplink transmissions often face collisions due to overlapping resource allocations, leading to inefficiencies and dropped packets, particularly when higher-priority downlink transmissions occur, which current systems struggle to manage effectively.
Innovation Solution
A user equipment (UE) and network entity implement mechanisms to drop lower-priority uplink transmissions in a slot when they collide with higher-priority downlink transmissions, and reschedule the lower-priority transmissions in the next available slot based on an indication in the downlink grant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE retransmits the first uplink transmission in a next available slot, then packet delivery reliability is improved, but signaling overhead increases
Solution Approach 1:
The UE autonomously determines and executes retransmission in the next available slot without requiring network entity coordination or additional signaling messages, allowing the system to serve itself by eliminating the need for retransmission grants or acknowledgments from the network side
Solution Approach 2:
The patent extracts the retransmission control function from the network entity and relocates it to the UE, removing the need for network-side retransmission management signaling and allowing the UE to independently handle retransmission timing and resource selection
2Ease of operation
If the network entity manages retransmissions, then transmission control is improved, but energy consumption increases
Solution Approach 1:
The UE independently manages its own retransmission operations by autonomously selecting the next available slot based on local timing information, eliminating the need for continuous network entity involvement and reducing overall system energy consumption associated with control signaling
Solution Approach 2:
The UE pre-determines retransmission timing by identifying the next available slot in advance based on stored timing information from the original grant, allowing it to prepare and execute retransmission without real-time network coordination, thereby reducing energy-consuming control interactions
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network entity, a first downlink transmission associated with a first priority based at least in part on a first downlink grant. The UE may receive, from the network entity, a second downlink transmission associated with a second priority that is higher than the first priority. The UE may drop a first uplink transmission associated with the first downlink transmission based at least in part on the first uplink transmission and a second uplink transmission associated with the second downlink transmission being associated with colliding resources in a slot. The UE may transmit, to the network entity, the first uplink transmission in a next available slot based at least in part on an indication included in the first downlink grant. Numerous other aspects are described.