LTE Handover Verification via Dedicated Preamble
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In conventional LTE mobile communication systems, 'PCI Confusion' occurs when a mobile station incorrectly handovers to a cell with the same Physical Cell ID as another cell, leading to data interference and communication disruptions, especially in environments with multiple small base stations or self-configured cells.
Innovation Solution
A handover method where the mobile station transmits specific identification information, such as C-RNTI or Dedicated RA Preamble, to the target cell, allowing the radio base station to verify and assign resources only if the information is valid for the intended cell, thereby preventing incorrect handovers and data interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station performs handover based on conventional LTE procedures without additional verification, then the handover process is simple and fast, but PCI confusion occurs causing data interference and communication disruptions
Solution Approach 1:
The patent applies preliminary action by having the mobile station transmit dedicated random access preamble information to the target base station before completing the handover procedure. This preliminary verification step prevents PCI confusion by ensuring the target cell properly recognizes the mobile station's identity before data transmission begins, thus avoiding data interference while maintaining procedure simplicity.
Solution Approach 2:
The patent implements feedback mechanisms where the target base station sends random access response messages to the mobile station, confirming successful reception and validation of the dedicated random access preamble. This feedback loop ensures accurate handover by verifying that the target cell correctly identifies the mobile station before establishing full communication, thereby preventing PCI confusion without significantly increasing complexity.
2Reliability
If the system uses conventional handover procedures, then the handover speed is fast, but data interference occurs due to PCI confusion in environments with multiple small base stations
Solution Approach 1:
The patent performs preliminary verification of the mobile station's identity by transmitting dedicated random access preamble information to the target base station before data transmission begins. This preliminary step prevents PCI confusion and ensures data transmission integrity, while the efficiency of the verification process minimizes impact on handover speed.
Solution Approach 2:
The patent extracts and verifies specific identification information (dedicated random access preamble) from the handover process. By separating this verification step from the main handover procedure, the system ensures data integrity through targeted verification without delaying the overall handover speed significantly.
3Reliability
If the radio base station assigns resources without verifying mobile station identification information, then resource assignment is fast, but communication disruptions occur due to incorrect handovers
Solution Approach 1:
The patent performs preliminary verification of mobile station identification information by transmitting dedicated random access preamble to the target base station before resource assignment. This preliminary action ensures communication stability by preventing incorrect handovers, while the verification process is designed to be efficient and minimize time loss.
Solution Approach 2:
The patent implements feedback mechanisms where the target base station verifies the mobile station's identification information and sends random access responses confirming successful verification before assigning resources. This feedback loop ensures communication stability by preventing incorrect handovers while maintaining efficient resource assignment timing.
Data Source
AI summary
A radio base station according to the present invention comprising the radio base station eNB#2 comprising a transmission unit 11 configured to transmit C-RNTI that can be used in the cell #2, to the radio base station eNB #1, in response to “HO Preparation (a handover preparation signal)” received from the radio base station eNB #1 that manages the cell #1, and a resource assignment unit 14 configured to notify a radio resource assigned to the mobile station UE by using C-RNTI included in “HO Complete”, when it is determined that C-RNTI included in “HO Complete” received from the mobile station UE that can be used in the cell #2.