NTN Uplink Resource Sharing for Reliable Early Data Transmission
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Solution Overview
Problem
Existing mobile communication systems in non-terrestrial networks (NTNs) face challenges in efficiently managing uplink resources for early data transmissions, particularly in scenarios where dedicated and shared resources are not optimally utilized, leading to inefficiencies and potential connection failures.
Innovation Solution
A wireless transmit/receive unit (WTRU) is configured to receive preconfigured uplink resource (PUR) configurations from NTN cells, allowing it to determine availability of dedicated or shared resources based on specific conditions, and selectively use these resources for early data transmissions (EDT) requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated PUR resources are allocated to WTRUs in NTN cells, then transmission reliability is improved, but resource utilization efficiency deteriorates due to idle dedicated resources
Solution Approach 1:
The patent enables dedicated PUR resources to serve dual purposes: dedicated resources for guaranteed reliable transmission and shared resources for efficient resource utilization. The WTRU can selectively switch between dedicated and shared resources based on availability, making the resource allocation system universally applicable to both reliability-critical and efficiency-critical scenarios
Solution Approach 2:
The patent introduces dynamic resource selection where the WTRU can adaptively choose between dedicated and shared PUR resources based on real-time conditions. The network can dynamically indicate resource availability through downlink messages, and the WTRU dynamically adjusts its transmission strategy accordingly, transforming static dedicated allocation into a dynamic hybrid allocation system
2Loss of energy
If shared PUR resources are used to improve resource utilization, then resource utilization efficiency is improved, but transmission reliability deteriorates due to contention and availability issues
Solution Approach 1:
The patent prepares fallback mechanisms in advance by configuring both dedicated and shared PUR resources before transmission needs arise. When shared resources are unavailable or contention occurs, the WTRU has pre-configured dedicated resources as a cushion to ensure reliable transmission, preventing transmission failures before they can impact service
Solution Approach 2:
The patent introduces a hybrid resource allocation mechanism that acts as an intermediary between dedicated and shared resources. The network controller mediates resource selection by indicating availability through downlink messages, and the WTRU uses this intermediate information to intelligently select the appropriate resource type, smoothing out the trade-off between reliability and efficiency
3Adaptability or versatility
If PUR configuration is provided from multiple NTN cells, then adaptability is improved, but device complexity increases due to configuration management
Solution Approach 1:
The patent inverts the traditional approach by having the network proactively indicate resource availability to the WTRU through downlink messages, rather than having the WTRU continuously monitor and query multiple cells for configuration information. This reversal simplifies the WTRU's configuration management burden while maintaining adaptability across multiple NTN cells
Data Source
AI summary
Systems, methods, devices, and instrumentalities are described herein related to configured (e.g., pre-configured) uplink resource sharing in non-terrestrial networks (NTNs). A wireless transmit/receive unit (WTRU) may be configured to receive a first preconfigured uplink resource (PUR) configuration from a first NTN cell. The first PUR configuration may indicate whether at least one resource is available on the first NTN cell and/or a second NTN cell. The WTRU may select the second NTN cell. The WTRU may receive a second PUR configuration from the second NTN cell. The second PUR configuration may include at least one of a dedicated PUR resource or a shared PUR resource. Based on the first PUR configuration and the second PUR configuration, the WTRU may determine whether a dedicated PUR resource is available. Based on a determination, the WTRU may transmit an early data transmission (EDT) request using the dedicated PUR resource.