L1/L2 Triggered Mobility Resource Allocation for Fast Cell Switching

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing mobility and resource allocation in heterogeneous networks, particularly in 5G New Radio (NR) environments, leading to suboptimal performance and increased latency.

Innovation Solution

Implementing Layer 1 (L1) and Layer 2 (L2) triggered mobility mechanisms within the CU-DU architecture, which enable dynamic resource allocation and beam management for seamless handovers and improved network performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional mobility management methods are used in heterogeneous networks, then device compatibility is maintained, but network efficiency deteriorates and latency increases

Engineering Contradiction:

Improvenetwork efficiencyVSAvoidlatency

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent segments mobility management into Layer 1 (physical layer) and Layer 2 (MAC layer) triggered mechanisms, allowing independent optimization of each layer. L1 handles fast beam-level mobility while L2 handles cell-level mobility, enabling parallel processing and reducing overall latency while improving network efficiency through specialized handling of different mobility aspects

Inventive Principle:

Principle #1Segmentation

2Productivity

If Layer 1 and Layer 2 triggered mobility mechanisms are implemented, then mobility management efficiency is improved, but device complexity increases

Engineering Contradiction:

Improvemobility management efficiencyVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent introduces a MAC CE (Medium Access Control Control Element) as an intermediary mechanism that coordinates between Layer 1 and Layer 2 mobility triggers. This standardized intermediary simplifies the interaction complexity by providing a unified interface and message format, allowing complex multi-layer coordination through a structured intermediary layer rather than direct complex interactions

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If dynamic resource allocation is implemented for beam management, then network performance is improved, but resource allocation complexity increases

Engineering Contradiction:

Improvenetwork performanceVSAvoidresource allocation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic resource allocation where beam resources are allocated based on real-time L1/L2 trigger conditions rather than static pre-configuration. Resources are dynamically activated/deactivated based on mobility events, allowing the system to adapt resource allocation to actual network conditions and improve performance while maintaining manageable complexity through event-driven dynamics

Inventive Principle:

Principle #15Dynamics

4Loss of time

If fast handovers are enabled through L1/L2 triggering, then user experience is improved, but handover failure risk increases

Engineering Contradiction:

Improvehandover latencyVSAvoidhandover success rate

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The patent prepares target beam and cell resources in advance through L1/L2 triggered pre-configuration before actual handover execution. Beam resources are pre-allocated and validated, and target cell parameters are pre-synchronized, allowing fast handover execution without sacrificing reliability since the target state is already prepared and validated in advance

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20260075479A1Resource for Layer 1 or Layer 2 Triggered Mobility

Publication Date: 2026.03.12 KONINKLIJKE PHILIPS NV

AI summary

A wireless device receives, from a base station, a medium access control (MAC) control element (CE) for a layer 1 or layer 2 triggered mobility (LTM) cell switch from a first cell to a second cell and a resource of the second cell for an uplink transmission, by the wireless device, of a random access preamble.