Wireless Device Random Access for Secondary Base Station Configuration
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Solution Overview
Problem
Current LTE systems face challenges in efficiently managing dual connectivity, where a user equipment (UE) connects to both a master eNB and a secondary eNB, as the secondary eNB is unaware when the UE has applied a new configuration, leading to potential delays in radio resource reconfiguration.
Innovation Solution
The UE initiates a random access procedure towards the secondary eNB after applying the new configuration, allowing the eNB to confirm the configuration change, thus eliminating the need for conservative activation time settings and reducing reconfiguration delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative activation time settings are used to ensure the UE receives the configuration before activation, then reliability of configuration application is improved, but reconfiguration delay increases
Solution Approach 1:
The patent implements a feedback mechanism where the UE sends a random access preamble to the secondary eNB after applying the new configuration. The secondary eNB detects this preamble and sends a random access response, providing feedback that confirms the configuration has been successfully applied. This feedback loop eliminates the need for conservative activation time settings while ensuring reliable configuration application.
Solution Approach 2:
The patent enables the UE to apply the new configuration immediately upon receipt without waiting for a predetermined activation time. The UE performs the configuration change in advance, before the network would traditionally activate it, and then notifies the network through the random access procedure. This preliminary action reduces reconfiguration delay while maintaining reliability through the feedback mechanism.
2Stability of the object's composition
If the secondary eNB waits for confirmation before activating new configuration, then configuration synchronization is improved, but reconfiguration delay increases
Solution Approach 1:
The patent inverts the traditional approach by having the UE initiate the confirmation process rather than the secondary eNB waiting passively. The UE applies the configuration and actively notifies the secondary eNB through a random access preamble. This inversion allows the secondary eNB to detect the configuration application immediately through random access detection, achieving both synchronization and reduced delay.
Solution Approach 2:
The patent enables the UE to self-verify and self-report the configuration application status. The UE independently determines when the configuration is applied and autonomously initiates the random access procedure to notify the network. This self-service approach eliminates the need for the secondary eNB to wait for confirmation while maintaining synchronization.
Data Source
AI summary
A method performed in a wireless device for handling connectivity to two network nodes. The method comprises receiving, from a first network node, a radio resource configuration message, the radio resource configuration message indicating a change in configuration of a connection towards a second network node; applying the change in configuration towards the second network node in response to the radio resource configuration message; and initiating a random access procedure towards the second network node after applying the change in configuration. The disclosure relates to corresponding wireless device, and to methods in network nodes, network nodes, computer programs and computer program products.