Target Base Station Core Network Node Selection in LTE Handover
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE-based mobile communication systems, there is no mechanism for a target base station to select an appropriate core network node during handover, leading to increased signal load and transmission delay, especially when a mobile station moves across different areas.
Innovation Solution
The system enables a target base station to select a core network node based on information provided by the source base station or mobile station, including identifiers for the connected core network node and its area, allowing for optimal CN node selection during handover procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the target base station uses the default mechanism without CN node selection capability, then the handover procedure is simple to implement, but the signal load on CN nodes increases and transmission delay increases when mobile station moves across different areas
Solution Approach 1:
The source base station performs preliminary actions by determining the identifier of a suitable target CN node before handover execution, and includes this identifier in the handover request message sent to the target base station. This allows the target base station to directly use the pre-determined CN node identifier without needing complex selection algorithms, thus reducing transmission delay while keeping the procedure relatively simple.
2Loss of time
If the target base station selects CN node based on provided information, then transmission delay is reduced and communication quality is improved, but the device complexity and information processing requirements increase
Solution Approach 1:
The source base station acts as an intermediary that performs the complex CN node selection task. It determines the suitable target CN node identifier based on the mobile station's current serving CN node and area information, then provides this identifier to the target base station. This shifts the processing complexity from the target base station to the source base station, which is already engaged in handover coordination, thereby minimizing additional complexity while achieving reduced transmission delay.
3Reliability
If CN node switching frequency is reduced, then service interruptions are minimized, but the adaptability to mobile station movement across different areas may be reduced
Solution Approach 1:
The system implements feedback mechanisms where the source base station evaluates the mobile station's current serving CN node and area information to determine whether CN node switching is actually necessary. The handover request message includes the determined target CN node identifier only when switching is beneficial, allowing the system to adapt to mobile station movement while avoiding unnecessary CN node switches that would cause service interruptions. This feedback-driven approach balances service continuity with adaptability.
Data Source
AI summary
A mobile communication system in which a plurality of base stations and a plurality of core network nodes are distributed in a plurality of areas, wherein a source base station or a mobile station in a handover procedure of the mobile station transmits information for selecting a core network node to a target base station.