Small Cell Signaling Radio Bearer Handover for Radio Link Failure
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Solution Overview
Problem
Current methods for processing radio link failures in mobile communication systems with separated control and data planes are not suitable for scenarios involving coordinated work between macro cells and pico cells, leading to service interruptions and reduced network coverage.
Innovation Solution
A processing method that determines signaling radio bearer transmission connection interruptions between user equipment and macro base stations, receives configuration parameters, establishes a new signaling radio bearer, and notifies the user equipment to hand over the connection to the small cell, providing a temporary control plane to reduce service interruption time and ensure network continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a small cell is deployed to provide broadband data offload service with separated control and data planes, then network coverage and service capacity are improved, but service interruption occurs when radio link failure happens between user equipment and macro base station
Solution Approach 1:
The patent introduces a small cell as an intermediary entity between user equipment and macro base station. When radio link failure occurs between UE and eNodeB, the small cell acts as a temporary control plane anchor, receiving RRC messages from UE and forwarding them to eNodeB, thereby maintaining service continuity during the failure period.
Solution Approach 2:
The system pre-establishes the small cell infrastructure with control plane capabilities before radio link failure occurs. The small cell is configured to immediately take over control plane functions when needed, without requiring complex real-time decision-making or reconfiguration during the failure event.
2Device complexity
If conventional radio link failure processing is used in separated control and data plane scenarios, then implementation is simple, but service interruption time increases and network coverage is reduced
Solution Approach 1:
The small cell is pre-configured with control plane functions and RRC message handling capabilities before failure occurs. This preliminary setup allows immediate takeover of control plane responsibilities without complex real-time configuration or decision-making during the failure event.
Solution Approach 2:
The small cell serves as an intermediary that simplifies the failure recovery process by directly receiving and forwarding RRC messages between UE and eNodeB, avoiding complex reconfiguration procedures and reducing service interruption time.
3Productivity
If user equipment resides in pico cell for data transmission while maintaining macro cell control connection, then data service capacity increases, but radio link failure risk increases due to additional connection management
Solution Approach 1:
The patent segments the control plane and data plane functions. The macro base station handles control plane functions while the small cell handles data plane functions. This segmentation allows independent optimization of each plane and provides fallback mechanisms when one plane experiences failure.
Solution Approach 2:
The small cell acts as an intermediary for control plane messages when the direct UE-eNodeB connection fails. This intermediary role maintains control plane stability while allowing data transmission to continue through the small cell, thereby improving overall radio link stability.
Data Source
AI summary
The present invention provides a processing method for a radio link failure, a small cell and a mobile communication system. The method includes: determining, by a small cell, whether or not a signaling radio bearer transmission connection between a user equipment and a macro base station is interrupted; receiving, if the signaling radio bearer transmission connection is interrupted, signaling radio bearer configuration parameters sent by the macro base station, wherein the signaling radio bearer configuration parameters comprise an SRB identification, a radio link control layer configuration and a logic channel configuration; establishing a signaling radio bearer for the user equipment according to the signaling radio bearer configuration parameters; and notifying the user equipment to hand over the signaling radio bearer transmission connection to the signaling radio bearer established by the small cell. In the present invention, service interruption time of the UE is reduced and continuity of service is guaranteed.