RAN Handover Configuration Segmentation for Lower Latency
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Solution Overview
Problem
Existing wireless communication systems experience longer latency and overhead during serving cell changes due to complete L2 and L1 resets during handovers, particularly in scenarios involving carrier aggregation and dual connectivity.
Innovation Solution
A method where a first node in the RAN communicates a second configuration to a UE, followed by a handover message to a second node or core network, and subsequently releases the second configuration, allowing for partial application of parameters before activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete L2 and L1 resets are performed during handover, then handover reliability is improved, but latency and overhead increase
Solution Approach 1:
The patent segments the handover configuration into two parts: (1) parameters that can be applied immediately without reset, and (2) parameters requiring L2/L1 reset. This segmentation allows the UE to apply beneficial configuration parameters immediately while deferring only those parameters that truly require reset, thereby reducing overall handover latency while maintaining reliability for critical functions.
Solution Approach 2:
The patent performs preliminary configuration of handover parameters before the actual handover execution. The UE receives and stores handover configuration parameters in advance, and applies those that do not require reset immediately upon receiving the handover command, before the L2/L1 reset occurs. This preliminary action reduces the time the UE needs to spend in the handover transition state.
2Stability of the object's composition
If complete L2 and L1 resets are performed during handover, then configuration consistency is improved, but overhead increases
Solution Approach 1:
The patent segments handover parameters into categories based on their reset requirements. By identifying and separating parameters that can be applied immediately from those requiring L2/L1 reset, the system maintains configuration consistency for critical parameters while avoiding unnecessary overhead from resetting parameters that don't require it. The segmentation enables selective application of configuration parameters.
Solution Approach 2:
The patent changes the state of configuration parameter application from all-at-once to selective timing. Parameters are changed based on their specific requirements: some are applied immediately upon receipt, while others are applied after L2/L1 reset. This parameter-based differentiation reduces overall overhead while maintaining necessary configuration consistency.
3Speed
If all configuration parameters are applied immediately, then handover speed is improved, but configuration conflicts may occur
Solution Approach 1:
The patent performs preliminary configuration by having the UE store and prepare handover parameters upon receiving the handover command, but delays application of parameters requiring L2/L1 reset until after the reset occurs. This preliminary preparation enables fast configuration of immediate parameters while ensuring correct timing for parameters that depend on reset, avoiding conflicts and maintaining reliability.
Solution Approach 2:
The patent introduces dynamic timing for parameter application based on each parameter's characteristics. Rather than a static all-or-nothing approach, the system dynamically determines when each parameter should be applied: immediately for some parameters and after L2/L1 reset for others. This dynamic approach optimizes handover speed while preventing configuration conflicts.
Data Source
AI summary
A first node of a RAN communicates with a UE in a first cell according to a first configuration; transmits, to the UE, a message including a second configuration for accessing a second cell subsequent to an activation command; subsequent to the transmitting and while the UE awaits the activation command, transmits a handover message to a second node of the RAN or a CN; and releases the second configuration.