Primary Cell L1/L2 Mobility With Preconfigured Handover Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in enabling seamless Layer 1 and Layer 2 mobility with low latency handovers, requiring RRC reconfiguration for cell changes, which can be inefficient and time-consuming.
Innovation Solution
A wireless transmit/receive unit (WTRU) performs L1/L2 switching of primary cells using L1/L2 mobility, with pre-configuration of common and specific configurations for candidate cells, allowing handovers without RRC reconfiguration by maintaining common configuration and applying specific configuration to target cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RRC reconfiguration is performed for handover, then handover reliability is improved, but handover latency increases and productivity decreases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple candidate PCells with their respective configurations before handover is needed. When handover is triggered, the WTRU can immediately switch to a pre-configured candidate cell without waiting for RRC reconfiguration, thus reducing handover latency while maintaining reliability through pre-validated configurations.
Solution Approach 2:
The patent segments the handover process into two parts: (1) pre-configuration of multiple candidate PCells with L1/L2 parameters, and (2) rapid switching among these candidates using L1/L2 indications. This segmentation allows the time-consuming configuration phase to be separated from the fast execution phase, reducing overall handover latency.
2Manufacturing precision
If RRC reconfiguration is performed for handover, then configuration accuracy is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent segments configuration management into common configuration (applicable to multiple candidate cells) and cell-specific configuration (for individual cells). This segmentation reduces the amount of configuration data that needs to be processed during handover, lowering device complexity while maintaining configuration accuracy through structured organization.
Solution Approach 2:
The patent performs preliminary configuration of candidate cells in advance, organizing configurations in a structured manner with common and cell-specific parts. This preliminary organization reduces the processing complexity during actual handover execution, as the WTRU only needs to select and apply pre-organized configurations rather than processing raw configuration data in real-time.
3Speed
If multiple candidate cell configurations are pre-configured, then handover speed is improved, but memory usage and device complexity increase
Solution Approach 1:
The patent merges common configuration elements across multiple candidate cells into a single shared configuration structure. Instead of storing duplicate common parameters for each candidate cell, the system maintains one common configuration that applies to all candidates, significantly reducing memory usage while enabling fast handover to multiple cells.
Solution Approach 2:
The common configuration structure serves multiple candidate cells simultaneously, making it a universal configuration that can be applied to any of the pre-configured candidate PCells. This multi-functionality reduces the total configuration data volume while maintaining the ability to perform fast handover to multiple different cells.
Data Source
AI summary
A wireless transmit/receive unit (WTRU) may perform L1/L2 switching of primary cells. In an approach, the WTRU configured with configuration information that is common to a multitude of candidate cells and separate configuration information that is specific to each candidate cell, may receive an LTM indication to handover (HO) to a particular candidate cell. Upon receiving the LTM indication to HO to the particular candidate cell, the WTRU may keep the common configuration information, release the separate configuration information specific to the serving cell and/or apply the separate configuration information specific to the target candidate cell.