Mobile Station Context Storage for Heterogeneous Wireless Reconnection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In heterogeneous wireless communication systems, there is a challenge in ensuring seamless handover from pico cells to macro cells, particularly when mobile stations move quickly, leading to Radio Link Failures (RLF) and service interruptions due to insufficient time for handover and reconnection.
Innovation Solution
The solution involves storing system information of the first Base Station (BS) when handover occurs from a pico cell to a macro cell, and using this information to reconnect to the macro BS after an RLF, along with transmitting and updating context information to maintain continuous service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover is performed from macro cell to pico cell and then back to macro cell, then service continuity is maintained, but service interruption occurs due to insufficient time for re-handover when moving quickly
Solution Approach 1:
The macro base station stores context information of the mobile station in advance before handover to pico cell. When radio link failure occurs in pico cell, the mobile station can quickly reconnect to the macro base station using the pre-stored context information, eliminating the need for time-consuming context re-establishment procedures.
Solution Approach 2:
The macro base station acts as an intermediary by maintaining context information during the mobile station's connection to pico cell. This intermediary storage of context information enables rapid reconnection without requiring full handover procedures, thus reducing service interruption time.
2Productivity
If context information is discarded during handover from macro BS to pico BS, then pico BS manages resources efficiently, but reconnection time increases when returning to macro BS
Solution Approach 1:
The macro base station performs preliminary storage of context information before handover occurs. This advance preparation ensures that when the mobile station needs to return to the macro base station, the context information is already available, eliminating delays associated with re-establishing context.
3Measurement precision
If MS performs handover to pico cell with excellent channel state, then data service quality improves, but service interruption risk increases for real-time services like VoIP
Solution Approach 1:
The macro base station prepares and stores context information in advance as a cushion against potential radio link failures. This pre-prepared information acts as a safety buffer that enables rapid recovery when handover to pico cell fails, protecting real-time services from interruption.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An apparatus and method in a heterogeneous wireless communication system reconnect a Mobile Station (MS) to a previously connected cell upon occurrence of a Radio Link Failure (RLF) in a current cell when a portion of a coverage of the second cell is included in a coverage of the first cell. A Mobile Station (MS) stores system information of a first Base Station (BS) of a first cell when performing handover from the first cell to a second cell. When changed system information of the first BS is received from a second BS of the second cell, the MS updates the stored system information using the changed system information. And when detecting that a connection with the second cell is lost prior to a handover from the second cell, the MS performs reconnection to the first BS using the stored system information.