NTN Uplink Resource Allocation for Conflict-Reduced Early Data Transmission
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Solution Overview
Problem
In non-terrestrial network (NTN) systems, the large coverage areas and long transmission delays pose challenges for efficient early data transmission (EDT) without random access procedures, leading to increased signaling overhead and power consumption.
Innovation Solution
A method for wireless communication that involves configuring multiple common pre-configured uplink resources (PURs) for terminal devices to perform contention-free or contention-based early data transmission (EDT) in NTN systems, using a unique wireless network temporary identifier (RNTI) to identify and reduce conflicts among devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple terminal devices perform RACH-less EDT via PUR in NTN systems, then signaling overhead and power consumption are reduced, but resource conflicts and transmission efficiency deteriorate due to large coverage areas and long transmission delays
Solution Approach 1:
The patent segments the large NTN coverage area into multiple smaller regions by introducing region identifiers. Terminal devices are assigned to specific regions, and each region has dedicated PUR resources. This segmentation reduces resource conflicts by limiting the number of devices sharing the same resources, thereby improving transmission efficiency while maintaining low power consumption through RACH-less EDT.
Solution Approach 2:
The patent implements preliminary actions by pre-configuring terminal devices with region identifiers and corresponding PUR resource information before data transmission. The network device pre-allocates resources based on device locations, allowing devices to directly transmit data without random access procedures. This preliminary configuration enables efficient resource utilization and reduces transmission delays in NTN environments.
2Productivity
If multiple terminal devices share common PUR resources for EDT, then resource utilization improves, but resource conflicts increase leading to transmission failures
Solution Approach 1:
The patent divides common PUR resources into region-specific resource pools, where each pool is associated with a particular geographic region identifier. Terminal devices in different regions use different PUR resources even though they share the same overall resource pool structure. This segmentation maintains high resource utilization while reducing conflicts by spatially separating device access to resources.
Solution Approach 2:
The patent introduces region identifiers as intermediaries between terminal devices and PUR resources. Instead of devices directly competing for resources, the region identifier mediates resource allocation by mapping devices to specific resource subsets. This intermediary mechanism enables efficient resource utilization across the network while preventing direct conflicts between devices in different regions.
3Speed
If RACH-less EDT is implemented in NTN systems, then access speed improves, but conflict resolution capability deteriorates due to lack of random access procedures
Solution Approach 1:
The patent performs preliminary conflict resolution by assigning unique region identifiers to terminal devices before data transmission. These identifiers are used to select dedicated PUR resources, preventing conflicts before they occur. This preliminary action maintains fast RACH-less EDT access while eliminating the need for post-conflict resolution procedures that would slow down transmission.
Solution Approach 2:
The patent enables terminal devices to self-select appropriate PUR resources based on their assigned region identifiers without requiring network coordination or random access procedures. Each device independently determines its transmission resources using the region identifier mapping, achieving both fast access speed and conflict-free transmission through self-service resource selection.
Data Source
AI summary
Provided are a method and apparatus for wireless communication. One example method includes: receiving, by a first terminal device in a non-terrestrial network (NTN), first information; determining, by the first terminal device, a first resource based on the first information, wherein the first resource is one of a plurality of common preconfigured uplink resources (PURs), and the plurality of common PURs are configured for data transmission in the NTN; and sending, by the first terminal device, first early data transmission (EDT) on the first resource