Configured Grant Timer Modification for NTN Uplink
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR networks with non-terrestrial networks (NTNs), the high round trip time (RTT) leads to challenges in receiving dynamic DCI scheduling transmissions or retransmissions for uplink transmission processes associated with configured grants, resulting in wasted resources due to the limitations of fallback DCI formats.
Innovation Solution
The method involves receiving a configured grant allocation for uplink transmission processes with a transmission process identifier, obtaining an indication that the network node uses a fallback DCI format, and modifying the uplink transmission process to optimize resource utilization, such as disabling the configured grant timer and allowing continuous use of CG resources for new and retransmission transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fallback DCI format is used for scheduling uplink transmissions in NTN, then device complexity is reduced, but resource utilization deteriorates due to inability to schedule retransmissions
Solution Approach 1:
The patent dynamically adjusts the configured grant timer based on whether fallback DCI format is detected. When fallback DCI is detected, the timer is disabled or extended, allowing the UE to continuously use CG resources for retransmissions without waiting for dynamic scheduling. This dynamic adaptation resolves the contradiction by maintaining simple fallback DCI format while optimizing resource utilization through timer modification.
Solution Approach 2:
The patent changes the parameter of the configured grant timer (disabling or extending it) when fallback DCI format is used. This parameter change allows the system to maintain the simplicity of fallback DCI format while improving resource utilization by enabling continuous use of configured grant resources for retransmissions in high RTT environments.
2Reliability
If configured grant timer is enabled for uplink transmission, then transmission reliability is improved through scheduled retransmissions, but latency increases in high RTT environments where retransmission scheduling is not possible
Solution Approach 1:
The patent prepares the system in advance by detecting whether fallback DCI format is being used and proactively disabling or extending the configured grant timer before retransmission opportunities are lost. This preliminary action prevents the latency issue from occurring in the first place, allowing continuous use of CG resources without waiting for unschedulable retransmissions in high RTT NTN environments.
3Adaptability or versatility
If dynamic DCI scheduling is used for uplink retransmissions, then resource allocation flexibility is improved, but productivity deteriorates in high RTT environments where retransmissions cannot be scheduled in time
Solution Approach 1:
The patent enables the UE to self-manage retransmissions by disabling the configured grant timer when fallback DCI is detected, allowing the UE to autonomously continue using CG resources without requiring timely dynamic DCI scheduling. This self-service approach resolves the contradiction by maintaining resource allocation flexibility while improving throughput in high RTT environments where dynamic scheduling is too slow.
Data Source
AI summary
Aspects described herein relate to receiving, from a network node, a first transmission for configuring a configured grant, wherein the configured grant allocates one or more resources associated with an uplink transmission process having a transmission process identifier, obtaining a first indication that the network node uses a fallback downlink control information (DCI) format, and modifying, based at least in part on obtaining the first indication and the transmission process identifier, the uplink transmission process. Other aspects relate to configuring a device for modifying the uplink transmission process, receiving uplink communications based on the modified uplink transmission process, and/or the like.