Modular RRC Reconfiguration for Low-Latency Cell Handover

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Solution Overview

Problem

Conventional L3 and conditional handover methods in wireless communications suffer from latency due to delays in sending measurement reports and receiving target configurations, particularly in non-conditional handovers.

Innovation Solution

Implementing modular RRC reconfiguration methods that minimize overhead and ensure seamless handovers by pre-configuring target cells, reducing unnecessary data retransmissions and data loss during handover processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional L3 handover or conditional handover is used, then the network provides target cell configuration after measurement report, but handover latency increases due to delay in sending measurement report and receiving target configuration

Engineering Contradiction:

Improvehandover reliabilityVSAvoidhandover latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The network pre-configures multiple candidate target cells with complete RRC configurations in advance, before the WTRU actually needs to handover. This preliminary configuration storage eliminates the need for real-time configuration transmission during handover, directly reducing handover latency while maintaining reliable connection establishment

Inventive Principle:

Principle #10Preliminary action

2Reliability

If conventional handover with full RRC reconfiguration is used, then target cell configuration is provided, but RRC configuration overhead increases and unnecessary data retransmissions occur

Engineering Contradiction:

Improvehandover completionVSAvoidRRC configuration overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The RRC configuration is segmented into modular components: common parameters that remain unchanged across cells, and cell-specific parameters that differ. The WTRU stores and applies only the relevant cell-specific configurations during handover, avoiding transmission of redundant common parameters and reducing overall RRC configuration overhead

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The WTRU maintains stored copies of pre-configured target cell configurations in memory. During handover, the WTRU directly applies the copied configuration from storage rather than receiving and processing new configuration messages, eliminating unnecessary data retransmissions and reducing configuration overhead

Inventive Principle:

Principle #26Copying

Data Source

PatentUS20260067775A1Methods, architectures, apparatuses and systems for cell handover

Publication Date: 2026.03.05 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Procedures, methods, architectures, apparatuses, systems, devices, and computer program products for cell handover of a wireless transmit-receive unit, WTRU, and radio resource control, RRC, configuration overhead and/or data retransmission are reduced. An RRC reconfiguration data structure is rendered modular by splitting the data structure into configuration parts, e.g., CU, DU and cell-specific parts. One configuration can be provided per CU, one configuration per DU, and one configuration per cell. According to an embodiment, one candidate cell group configuration is provided for each potential SCG and for each potential MCG. Any part of the configuration may be provided with an ID. By using common building blocks and IDs, the WTRU may determine, based on the IDs of the source and target cell configurations, what the delta configuration is, and apply any necessary configurations and associated actions.