RRC Connection Establishment Optimization in LTE User Equipment
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Solution Overview
Problem
Current LTE system RRC connection establishment procedures are inefficient due to unnecessary waiting times and missed calls resulting from lower layer failures like cell reselection and cell barring, as UE NAS procedures are delayed until specific timers expire, leading to aborted or pending service requests.
Innovation Solution
Implementing a method where the UE initiates RRC connection establishment procedures immediately upon completion of cell reselection or cell barring, and allows for reinitiation of service requests with higher priority causes, independent of pending procedures, and after completion of periodic TAU procedures, to optimize RRC connection establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE NAS waits for timer T3411 to expire before re-initiating NAS procedure after lower layer failure, then the system follows current specification requirements, but the UE experiences unnecessary waiting time and cannot access services even when cell reselection is completed much earlier
Solution Approach 1:
The patent applies preliminary action by checking whether the specific event (cell reselection or cell barring) has been completed before allowing NAS procedure re-initiation. Instead of passively waiting for timer expiration, the system proactively monitors event completion status and enables NAS procedures as soon as the blocking condition is resolved, thereby eliminating unnecessary waiting time while maintaining reliability
Solution Approach 2:
The patent implements feedback by continuously monitoring the status of lower layer events (cell reselection completion or cell barring release) and using this feedback information to control NAS procedure re-initiation. The RRC layer provides feedback to NAS about event completion status, enabling dynamic decision-making rather than rigid timer-based waiting
2Reliability
If UE NAS does not retransmit service request message when receiving failure message from RRC during service request procedure, then the current specification is followed, but the MT call is missed because the UE hangs up the call due to no answering
Solution Approach 1:
The patent applies preliminary action by pre-checking whether the specific event (cell reselection or cell barring) has been completed before determining NAS procedure re-initiation. When the event is completed, the system proactively retransmits the service request message with updated RRC connection establishment cause, rather than waiting for timer expiration or passive conditions
Solution Approach 2:
The patent implements dynamics by making the NAS procedure re-initiation behavior adaptive based on real-time event completion status. The system dynamically adjusts its behavior: if the specific event is completed, NAS re-initiates the procedure; if not completed, it waits. This dynamic approach replaces the static specification behavior, optimizing both reliability and timing
3Reliability
If UE performs access barring control function to limit access during cell barred event, then current specification requirements are met, but the RRC connection establishment is delayed or aborted even when the barring condition is temporarily resolved
Solution Approach 1:
The patent applies preliminary action by monitoring and detecting when the cell barring condition is resolved (specific event completion) before allowing RRC connection establishment to proceed. Instead of waiting for timer expiration, the system proactively checks event completion status and enables connection establishment as soon as the barring restriction is lifted, improving efficiency while maintaining access control reliability
Data Source
AI summary
A method of improving Radio Resource Control, abbreviated to RRC, connection establishment for an RRC layer of a user equipment in a wireless communication system, the method including when a specific event occurs during an RRC connection establishment procedure, initiating the RRC connection establishment procedure based on completion of the specific event.