RNA Update Management During Small Data Transmission in 5G
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Solution Overview
Problem
Current 5G wireless communication systems face challenges in efficiently updating the Radio Access Network (RNA) during Small Data Transmission (SDT), particularly in managing timers like T380, which can lead to delayed RNA updates and affect system performance.
Innovation Solution
A method and apparatus for managing RNA updates during SDT by handling timer T380 expiration and initiating RRC connection resume procedures appropriately, ensuring timely RNA updates and maintaining system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If timer T380 is stopped during SDT procedure, then SDT can be performed without interruption, but RNA update is delayed causing outdated notification area information
Solution Approach 1:
The patent applies preliminary action by checking whether the SDT procedure is ongoing before stopping timer T380. The base station determines the SDT status in advance and only stops the timer when SDT is actively proceeding, preventing premature RNA updates that would interrupt SDT. This resolves the contradiction by proactively managing timer behavior based on SDT state.
Solution Approach 2:
The patent applies local quality by differentiating timer management based on local SDT procedure status. Instead of a uniform timer stopping rule, the base station applies selective timer stopping only in the specific local condition where SDT is ongoing, while allowing timer operation in other states. This localized approach maintains SDT continuity where needed while preserving RNA update timeliness elsewhere.
2Reliability
If timer T380 continues running during SDT, then RNA update remains timely, but SDT procedure may be interrupted causing transmission delays
Solution Approach 1:
The base station performs preliminary assessment of SDT procedure status before making timer stopping decisions. By checking whether SDT is ongoing in advance, the system can proactively protect SDT continuity by stopping the timer only when appropriate, rather than reacting after interruption occurs.
Solution Approach 2:
The patent applies dynamics by making the timer stopping behavior adaptive to the current SDT procedure state. The timer T380 dynamically changes its stopping behavior based on real-time SDT status - stopping when SDT is ongoing and continuing when it is not. This dynamic adjustment resolves the contradiction by flexibility rather than fixed rules.
3Reliability
If RNA update is triggered frequently, then notification area information remains current, but system overhead and signaling load increase
Solution Approach 1:
The patent applies local quality by making RNA update decisions location-specific based on whether the UE is currently undergoing SDT procedure in that cell. The base station evaluates local SDT status and only suppresses RNA update locally when SDT is actively proceeding in its coverage area. This localized suppression reduces unnecessary signaling overhead while maintaining RNA accuracy where SDT is not occurring.
Solution Approach 2:
The system applies self-service by having the base station autonomously determine whether to suppress RNA update based on its own knowledge of ongoing SDT procedures. The base station uses its internal state information about active SDT UEs to make intelligent update suppression decisions, reducing signaling overhead without external coordination while maintaining network accuracy.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a terminal in a wireless communication system is provided. The method may include: receiving, from a base station, a radio resource control (RRC) release message including a parameter indicating a timer that triggers a radio access network based notification area (RNA) update; transitioning to an RRC inactive state and starting the timer, based on the RRC release message; in case that criteria for small data transmission (SDT) are met while the timer is running, transmitting, to the base station, an RRC resume request message for the SDT, wherein the timer is not stopped when the RRC resume request message is transmitted; and in case that the timer expires while the SDT is ongoing, setting a variable indicating whether the RNA update is pending, to a true value.