Configured Grant Timer Control for Intra-UE Multiplexing
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Solution Overview
Problem
Existing technologies face challenges in efficiently managing overlapping uplink grants in wireless communication systems, particularly in prioritizing and multiplexing data from different logical channels, which leads to resource conflicts and inefficient use of radio resources.
Innovation Solution
A method and system that allow a wireless device to pre-empt a transmission based on a later received overlapping grant, and to control a timer associated with a configured grant in the Hybrid Automatic Repeat Request (HARQ) process, enabling enhanced resource utilization and spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE waits for ConfiguredGrantTimer expiration before using pre-empted grants for new transmissions, then the HARQ process can complete its cycle, but resource utilization deteriorates due to unnecessary delays
Solution Approach 1:
The patent applies preliminary action by checking whether the pre-empted data has been successfully transmitted or multiplexed before the timer expires. If the data is confirmed to be transmitted/multiplexed, the UE can proactively stop the ConfiguredGrantTimer and reuse the grant for new transmissions without waiting for natural expiration, thus improving resource utilization while avoiding unnecessary delays
Solution Approach 2:
The patent implements feedback mechanisms where the UE monitors the transmission status of pre-empted data through HARQ acknowledgments and multiplexing outcomes. Based on this feedback, the UE dynamically decides whether to stop the ConfiguredGrantTimer early or let it expire naturally, optimizing the balance between resource utilization and transmission reliability
2Productivity
If the UE multiplexes pre-empted data onto the pre-empting grant, then spectral efficiency improves, but the HARQ process management becomes more complex
Solution Approach 1:
The patent applies merging by combining pre-empted data with the pre-empting grant transmission. When the UE multiplexes pre-empted data onto the pre-empting grant, it consolidates multiple data streams into a single transmission, improving spectral efficiency by utilizing the already-allocated radio resources more fully
Solution Approach 2:
The patent uses the ConfiguredGrantTimer as an intermediary mechanism to manage HARQ processes during multiplexing operations. The timer provides a structured way to track and manage the state of pre-empted grants, simplifying the complexity of HARQ process management by providing clear start/stop conditions based on multiplexing outcomes
3Reliability
If the UE supports multiple periodic URLLC flows with separate configured grants, then service reliability improves, but the number of overlapping grant scenarios increases
Solution Approach 1:
The patent applies segmentation by maintaining separate HARQ processes and ConfiguredGrantTimers for each periodic URLLC flow. This segmentation allows the UE to independently manage each grant and its associated timer, ensuring that reliability requirements for each service flow are met while providing clear, modular management of multiple overlapping grants
Solution Approach 2:
The patent uses parameter changes in the timer management logic to adapt to different grant overlapping scenarios. By dynamically starting or stopping ConfiguredGrantTimers based on pre-emption detection and multiplexing outcomes, the system adjusts its behavior to maintain reliability across multiple URLLC flows while managing the complexity of overlapping grants
Data Source
AI summary
According to certain embodiments, a method performed by a wireless device comprises receiving a first grant and a second grant from a network node. The first grant and the second grant are overlapping. The method comprises pre-empting a transmission for the first grant based on prioritizing a transmission for the second grant. The method comprises controlling a timer used in a hybrid automatic repeat request (HARQ) process associated with the first grant based on pre-empting the transmission for the first grant.