Small Data Transmission Context Handling for Mobile Terminals
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Solution Overview
Problem
Current 5G mobile communication systems face challenges in efficiently supporting small data transmission while considering terminal mobility, particularly in scenarios where the terminal transitions to an inactive radio access state, requiring improved methods for data handling between base stations.
Innovation Solution
A method where a first base station sends a request for a terminal context to a second base station with an SDT indicator, and based on the response, either partial or entire context information is transferred, allowing for efficient uplink data transfer, even when the terminal context is not relocated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the terminal transitions to an inactive radio access state to save resources, then energy consumption is reduced and network resources are saved, but data transmission capability is lost and connectivity is interrupted
Solution Approach 1:
The patent segments data transmission into two types: small data transmission (SDT) that can occur in inactive state, and conventional data transmission that requires connected state. This segmentation allows the system to maintain connectivity for small data while saving resources for larger data transfers, resolving the contradiction between energy saving and connectivity reliability
Solution Approach 2:
The patent introduces dynamic state management where the terminal can flexibly transition between inactive and connected states based on data transmission needs. The base station dynamically adjusts its behavior by requesting terminal context information when SDT is detected, enabling the system to adapt connectivity status to actual transmission requirements rather than being locked into a single state
2Reliability
If the base station requests complete terminal context information to ensure reliable data transmission, then connectivity reliability is improved, but signaling overhead increases and processing time is extended
Solution Approach 1:
The patent extracts only the necessary terminal context information required for small data transmission when the base station requests context from the previous base station. Instead of transferring the complete terminal context, the system extracts and transmits only the essential information needed for SDT, reducing signaling overhead and processing complexity while maintaining transmission reliability
Solution Approach 2:
The patent applies partial action by requesting only the minimum necessary terminal context information rather than the complete context. The base station requests context specifically for SDT purposes, and the previous base station provides only the relevant partial information, avoiding the excessive action of transferring entire context data structures
3Reliability
If the base station maintains terminal context information to enable seamless data transmission during mobility, then connectivity is maintained, but storage resources and processing overhead are increased
Solution Approach 1:
The patent applies local quality by differentiating the treatment of terminal context information based on the type of data transmission. Complete terminal context is maintained and stored only when needed for conventional data transmission in connected state, while only minimal context information is retained for inactive state SDT operations. This selective storage approach reduces overall resource consumption while maintaining connectivity where required
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to an embodiment of the disclosure, a method of a first base station may be provided, the method comprising the steps of: receiving a radio resource control (RRC) resume message for small data transmission (SDT) from an RRC inactive terminal; transmitting a first message for requesting of a terminal context to a second base station, wherein the first message includes an SDT indicator; in case that the terminal context is not relocated for the SDT, receiving a second message including partial information of the entire context of the terminal, which is included in the second base station; and based on the partial information of the second message, transferring uplink data of the terminal to the second base station.