UE SCell Configuration Indication in Dual Connectivity
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a need for efficient methods to configure and manage secondary cells (SCells) in dual connectivity scenarios, where user equipment (UE) must synchronize with multiple cells controlled by different eNodeBs, especially when non-ideal backhaul conditions exist, and there is a lack of standardized signaling for successful configuration indications.
Innovation Solution
A method where the user equipment (UE) receives configuration information from a primary cell (PCell), performs synchronization with a secondary cell (SCell), and transmits an indication of successful or failed configuration through specific RRC connection messages, such as RRC connection reconfiguration complete or re-establishment request messages, to manage dual connectivity and SCell changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual connectivity is implemented with multiple cells controlled by different eNodeBs, then network capacity and coverage are improved, but system complexity and synchronization difficulty increase
Solution Approach 1:
The patent introduces a master eNodeB as an intermediary that coordinates between the user equipment and secondary eNodeBs. The master eNodeB manages the RRC connection and facilitates synchronization procedures, reducing the complexity burden on the UE when dealing with multiple eNodeBs simultaneously.
Solution Approach 2:
The patent segments the connectivity management into primary and secondary components. The primary cell (PCell) handles essential control functions while secondary cells (SCells) provide additional capacity. This segmentation allows the system to manage multiple connections by dividing responsibilities between different cell types.
2Adaptability or versatility
If SCell configuration is performed without standardized indication signaling, then configuration flexibility is maintained, but configuration reliability and failure handling are insufficient
Solution Approach 1:
The patent implements feedback mechanisms where the UE sends indication messages to the network about SCell configuration status. These indications provide feedback on whether synchronization was successful, enabling the network to reliably track configuration state and take appropriate actions based on the feedback received.
Solution Approach 2:
The patent establishes preliminary indication signaling frameworks that prepare the system for potential configuration failures. By having predefined indication mechanisms in place before configuration issues arise, the system can quickly respond to synchronization failures without ad-hoc problem-solving, improving overall reliability.
3Adaptability or versatility
If synchronization procedure with SCell is performed, then communication capability is improved, but time and resource overhead increase
Solution Approach 1:
The patent performs preliminary configuration actions at the master eNodeB before actual SCell synchronization. By preparing configuration data and instructions in advance, the actual synchronization process at the UE can proceed more quickly without needing to request and process configuration details during the time-critical synchronization phase.
Solution Approach 2:
The patent enables the UE to autonomously perform synchronization procedures using pre-configured parameters. The UE independently executes the synchronization process with the SCell without requiring continuous network intervention, reducing the time overhead associated with network-coordinated synchronization procedures.
Data Source
AI summary
A method and apparatus for transmitting an indication in a wireless communication system is provided. A user equipment (UE) receives information on a configuration of a second cell from a first cell, performs a synchronization procedure with the second cell, and after the synchronization procedure is successfully performed, transmitting an indication, which indicates that the second cell is successfully configured, to the first cell. Accordingly, a radio resource control (RRC) connection reconfiguration complete message is transmitted after the synchronization procedure.