Inter-MeNB Handover SeNB Keep Indicator Skipping Random Access
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, the inter-master eNodeB (MeNB) handover process without secondary eNB (SeNB) change involves unnecessary random access procedures, leading to inefficient signaling and optimization challenges.
Innovation Solution
A method that skips the random access procedure to the SeNB by using a 'SeNB kept indicator' in the RRCConnectionReconfiguration message, allowing the UE to determine if the SeNB has been kept successfully during the inter-MeNB handover, thereby avoiding unnecessary synchronization with the SeNB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the random access procedure is performed to the SeNB during inter-MeNB handover, then the handover reliability is improved, but the handover latency and signaling overhead increase
Solution Approach 1:
The patent extracts and removes the random access procedure to SeNB from the inter-MeNB handover process when the SeNB is kept unchanged. By identifying that the random access to SeNB is unnecessary when SeNB remains the same, the procedure is eliminated, reducing handover latency and signaling overhead while maintaining reliability through alternative verification mechanisms.
Solution Approach 2:
The patent performs preliminary determination of whether SeNB will be kept before executing the handover procedure. By using the SeNB kept indicator to pre-assess the necessity of random access to SeNB, the system avoids performing unnecessary random access procedures, thereby reducing handover latency while ensuring reliability through proper conditional execution.
2Stability of the object's composition
If the random access procedure is performed to the SeNB during inter-MeNB handover, then the connection stability is improved, but the signaling overhead increases
Solution Approach 1:
The patent extracts and eliminates the unnecessary random access signaling to SeNB from the handover procedure. By removing this redundant signaling step when SeNB is kept unchanged, the overall signaling overhead is reduced while connection stability is maintained through alternative confirmation mechanisms and proper state management.
Solution Approach 2:
The patent performs preliminary assessment using the SeNB kept indicator to determine whether random access to SeNB is necessary before the handover executes. This preliminary action prevents unnecessary signaling overhead by conditionally executing the random access procedure only when actually needed, while still ensuring connection stability through proper verification.
3Productivity
If the SeNB kept indicator is used to skip random access procedure, then the handover efficiency is improved, but the complexity of handover management increases
Solution Approach 1:
The patent employs the SeNB kept indicator as a universal signaling mechanism that serves multiple functions: it indicates whether SeNB is kept, triggers the decision to skip or perform random access, and coordinates between source and target MeNBs. This multi-functional indicator simplifies overall handover management despite the conditional logic introduced.
Solution Approach 2:
The patent implements a feedback mechanism where the source MeNB sends the SeNB kept indicator to the target MeNB, which then uses this feedback information to decide whether to perform random access to SeNB. This feedback-based decision making improves handover efficiency by avoiding unnecessary procedures while the structured feedback loop keeps management complexity manageable.
Data Source
AI summary
In an inter-master eNB (MeNB) handover procedure without secondary eNB (SeNB) change, a user equipment (UE) receives a SeNB kept indicator indicating that a SeNB has been kept successfully from a source MeNB. Upon receiving the SeNB kept indicator, the UE determines that the SeNB has been kept successfully in the inter-MeNB handover without SeNB change, and skips the random access procedure to the SeNB.