RRC Inactive Small Data Transmission with Threshold-Based Resource Selection
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Solution Overview
Problem
The challenge in wireless communication systems is to efficiently perform small data transmission (SDT) in a radio resource control (RRC) INACTIVE state while addressing latency and resource utilization, particularly in scenarios where the time gap between resources is critical.
Innovation Solution
A method and apparatus for SDT in RRC INACTIVE state, where a user equipment (UE) receives a message indicating a change in RRC state with resource information and a threshold, allowing data transmission based on the first available resource if the time gap is below the threshold, and ignoring earlier resources if the gap exceeds it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE uses the earliest available resource for SDT in RRC INACTIVE state, then the transmission latency is reduced, but resource conflicts and ambiguity between RACH and configured grants may occur
Solution Approach 1:
The patent introduces a time gap threshold parameter that changes the UE's resource selection behavior. When the time gap between the first resource (RACH) and second resource (configured grant) is smaller than the threshold, the UE selects the first resource; otherwise, it selects the second resource. This parameter-based decision mechanism resolves the contradiction by providing clear, condition-dependent resource allocation rules that reduce latency while preventing conflicts.
2Productivity
If the UE waits for configured grant resources, then resource utilization is optimized, but transmission delay increases
Solution Approach 1:
The patent implements a dynamic resource selection mechanism where the UE adapts its transmission resource choice based on the time gap condition. Rather than statically waiting for configured grants, the UE dynamically evaluates the time gap between RACH and configured grant resources, selecting RACH when the gap is small (prioritizing speed) and configured grants when the gap is large (prioritizing resource efficiency). This dynamic approach resolves the contradiction between resource utilization and transmission delay.
3Speed
If the UE always uses RACH for SDT, then transmission speed is improved, but resource waste occurs when configured grants are available
Solution Approach 1:
The patent uses the time gap threshold parameter to control when RACH should be used versus when configured grants should be used. When the time gap is below the threshold, RACH is selected for fast transmission; when the gap exceeds the threshold, configured grants are selected to avoid resource waste. This parameter-driven approach resolves the contradiction between transmission speed and resource efficiency by making the selection adaptive to actual resource availability conditions.
Data Source
AI summary
The present disclosure relates to a method of performing data transmission by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of receiving a message indicating a change of a Radio resource control (RRC) state from a RRC CONNECTED state to a RRC INACTIVE state, wherein the message includes information related to second resources and a threshold; and if a time gap between a current time and a first resource is smaller than the threshold, performing the data transmission in the RRC INACTIVE state based on the first resource with ignoring at least one of the second resources which is located earlier than the first resource.