RRC Re-establishment via Carrier Selection Policy
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Solution Overview
Problem
In LTE wireless systems, the existing methods for triggering Radio Resource Control (RRC) connection re-establishment after a failed radio access procedure are inefficient, leading to prolonged delays in radio link recovery, especially in Carrier Aggregation scenarios where multiple component carriers are involved.
Innovation Solution
The proposed method involves selecting the most suitable component carrier for the random access procedure based on path loss, Power Headroom Report, and time-frequency domain configuration, and if the maximum failure times are reached, initiating the RRC connection re-establishment on the primary or secondary component carriers, while avoiding repeated selection of failed carriers, and utilizing specific timers to determine when to trigger the re-establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing method for triggering RRC connection re-establishment is used after failed random access procedure, then the system maintains compatibility with standard protocols, but the radio link recovery delay is prolonged and recovery efficiency is reduced
Solution Approach 1:
The patent applies preliminary action by pre-configuring failure counters for each component carrier and proactively monitoring random access failure times. When the failure time on a component carrier reaches the maximum threshold, the system immediately triggers re-establishment on a different component carrier before complete link failure occurs, thereby reducing overall recovery delay while maintaining protocol compatibility
Solution Approach 2:
The patent segments the radio link recovery process by introducing per-component-carrier failure counters and independent failure time monitoring. Instead of treating all component carriers uniformly, the system divides the recovery mechanism into carrier-specific segments, allowing selective re-establishment on individual carriers based on their specific failure conditions, thus improving overall recovery efficiency
2Productivity
If random access procedure is repeatedly attempted on the same component carrier after failure, then the system maintains simple selection logic, but the recovery delay increases due to repeated failures
Solution Approach 1:
The patent implements feedback mechanisms by introducing failure counters that track random access failure times on each component carrier. When the failure counter reaches the maximum threshold, this feedback triggers the selection of an alternative component carrier for re-establishment, preventing repeated failures on the same carrier and thereby improving recovery speed while minimizing time loss
Data Source
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AI summary
The disclosure discloses a method for triggering Radio Resource Control (RRC) connection re-establishment, comprising: setting a random access policy for a UE, and further comprising: when the random access procedure initiated by the UE according to the set random access policy is failed, the RRC connection re-establishment procedure is triggered. The disclosure further discloses a device for triggering RRC connection re-establishment, comprising: a setting unit, an initiating unit, a determining unit and a triggering unit, wherein the setting unit is configured to setting a random access policy for a UE; the initiating unit is configured to initiating random access procedure according to the set random access policy; the determining unit is configured to determining whether the random access procedure initiated by the initiating unit is successful, and triggering the triggering unit if not; and the triggering unit is configured to triggering RRC connection re-establishment procedure. The technical solution of the disclosure is easy, and has the advantages of high inheritance of the related art, small delay, fast recovery of radio link and the like.