Wireless Device TA Validity Feedback for Configured Resource Release
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Solution Overview
Problem
In wireless communication networks, preconfigured uplink resources for small data transmission in the inactive state are often invalidated due to timing advance (TA) issues, leading to wasted resources, especially in high-frequency bands like FR2, where more resources are configured, and the network node lacks information about the validity of TA at the user equipment (UE).
Innovation Solution
A method where the wireless device evaluates the validity of the TA at a later time and sends an indication to the network node, allowing for earlier release of configured resources when they are not usable, thereby optimizing resource utilization by informing the network about TA validity or invalidity based on specific conditions such as resource configuration, beam changes, and timer settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If preconfigured uplink resources are allocated for small data transmission in inactive state, then data transmission efficiency is improved, but resource waste occurs when TA becomes invalid
Solution Approach 1:
The UE provides feedback to the network node about TA validity status by sending an indication message. This feedback mechanism allows the network to know when configured resources are no longer usable due to TA expiration, enabling timely resource release and avoiding waste while maintaining the benefit of preconfigured resources for active transmissions.
Solution Approach 2:
The network node preconfigures uplink resources and TA values for the UE before the UE enters inactive state. This preliminary configuration enables fast small data transmission without requiring connection setup, while the subsequent TA validity indication mechanism ensures resources are released when no longer needed.
2Reliability
If TA validation is performed at UE side, then transmission reliability is improved, but network node lacks information about TA validity
Solution Approach 1:
The UE validates TA locally before transmission to ensure reliability, and simultaneously provides feedback to the network node about the validation result through an indication message. This resolves the information asymmetry while maintaining transmission reliability through local validation.
3Device complexity
If configured resources are released only when timer expires, then resource management is simplified, but resource utilization efficiency decreases
Solution Approach 1:
Instead of relying solely on timer expiration, the UE actively reports TA validity status to the network. This feedback enables the network to release resources immediately when TA becomes invalid, improving resource utilization without significantly increasing management complexity since the reporting mechanism is already part of the communication protocol.
4Productivity
If more configured resources are allocated in FR2, then data transmission capacity is improved, but resource waste increases due to TA invalidity
Solution Approach 1:
The feedback mechanism works particularly important in FR2 where more resources are configured. By continuously monitoring TA validity and reporting to the network, the UE enables timely release of invalidated resources, ensuring that the high resource allocation in FR2 is fully utilized and not wasted due to TA expiration.
Data Source
AI summary
A method performed by a wireless device for handling configured resources for a data transmission to a network node in a wireless communications network is provided. When being in connected mobility state, the wireless device receives (201) a configuration from the network node at a first point in time, T1. The configuration is for resources for the data transmission. The wireless device enters (202) into inactive mobility state. When being in inactive mobility state, the wireless device deciding (203) whether or not a Timing Advance, TA, for the resources configured at T1 for the data transmission is valid at a second point in time, T2. The wireless device sends (204) an indication to the network node, indicating whether or not the TA for the resources configured for the data transmission at T1 is valid at a second point in time, T2, as decided.