RRC Re-Establishment Gating by SDT Timer in Inactive State
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Solution Overview
Problem
In wireless communication systems, particularly in the RRC_INACTIVE state, existing protocols trigger RRC connection re-establishment procedures when link problems occur during Small Data Transmission (SDT), which is not applicable and leads to inefficiencies.
Innovation Solution
A method is introduced where an RRC connection re-establishment procedure is determined based on the state of a first timer, only executing it when the timer is not running, thereby avoiding unnecessary re-establishments by considering conditions such as random access problems and radio link issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RRC connection re-establishment procedure is executed when link problems are detected during SDT, then connection reliability is improved, but device complexity and protocol overhead increase
Solution Approach 1:
The patent changes the state parameter by introducing a timer mechanism that transitions the system between two states: when the timer is running, re-establishment is suppressed; when the timer expires or is not running, re-establishment can proceed. This parameter-based control resolves the contradiction by dynamically adjusting the system's response to link problems based on the SDT context.
Solution Approach 2:
The timer acts as an intermediary mechanism between link problem detection and re-establishment execution. Instead of directly triggering re-establishment upon detecting link problems, the timer mediates the decision process, allowing the system to distinguish between transient issues during SDT and genuine connection failures requiring re-establishment.
2Stability of the object's composition
If RRC connection re-establishment procedure is executed during SDT, then connection stability is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the re-establishment procedure conditional rather than static. The system dynamically evaluates the timer state at the moment link problems are detected, allowing flexible response that adapts to the current SDT context. This dynamic approach maintains stability when appropriate while avoiding unnecessary re-establishment that would harm transmission efficiency.
3Reliability
If security is activated and DRB/SRB2 is established before SDT, then transmission reliability is improved, but the inability to execute re-establishment during SDT worsens connection recovery capability
Solution Approach 1:
The patent segments the connection management into distinct phases: the SDT phase where re-establishment is suppressed (timer running), and the normal phase where re-establishment is available (timer not running). This segmentation allows the system to optimize for SDT performance while preserving recovery capability when needed, resolving the contradiction between transmission reliability during SDT and connection recovery capability.
Data Source
AI summary
A method and user equipment (UE) configured for wireless communications. The UE is configured to receive information indicating a value of a first timer. The first timer is a timer related to small data transfer (SDT). The UE is configured to start the first timer based on a first message. The first message is used to request transmitting data through a data radio bearer (DRC) in a radio resource control (RRC) inactive state. The UE is configured to determine whether to execute an RRC connection re-establishment procedure based on at least a target condition being satisfied and a state of the first timer. The target condition is a condition in a condition set. The condition set comprises: receiving a random access problem indication from a master cell group (MCG) medium access control (MAC) and a state of at least a plurality of second timers.