Random Access Mobility Handling for Candidate Cell Reentry

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing mobility and random access procedures, particularly in heterogeneous networks with varying cell sizes and technologies, leading to suboptimal performance and resource utilization.

Innovation Solution

Implementing a random access procedure that adapts to mobility scenarios by utilizing multiple technologies and releases, including LTE and 5G, with enhanced protocol stacks and beam management techniques to optimize communication between wireless devices and base stations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional random access procedures are used in heterogeneous networks, then device compatibility is maintained, but access efficiency and network performance deteriorate due to suboptimal resource utilization

Engineering Contradiction:

Improverandom access efficiencyVSAvoidnetwork heterogeneity adaptation

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic random access procedures that adapt to mobility scenarios and network conditions. The system dynamically selects between different random access types (contention-based and contention-free) and adjusts parameters based on device mobility state, network load, and cell size, thereby improving access efficiency while maintaining adaptability to heterogeneous networks

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes key parameters of the random access procedure based on network conditions and device states. This includes adjusting preamble formats, selecting different random access resources, and modifying timing parameters to optimize performance for specific scenarios such as high mobility, low latency requirements, or resource-constrained environments

Inventive Principle:

Principle #35Parameter changes

2Reliability

If mobility management is enhanced with multiple technologies and releases, then communication performance improves, but system complexity increases due to protocol stack integration

Engineering Contradiction:

Improvemobility management performanceVSAvoidprotocol stack complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the protocol stack into distinct functional layers (RRC, MAC, PHY) with clearly defined responsibilities for mobility management. Each layer handles specific tasks independently, allowing for enhanced mobility performance through coordinated action across layers while managing complexity through modular design and clear interface definitions

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20260075657A1Random Access Procedure with Mobility

Publication Date: 2026.03.12 OFINNO LLC

AI summary

A method performed by a wireless device can include receiving a first physical downlink control channel (PDCCH) order initiating a first random access (RA) procedure for a candidate cell for layer-1 or layer-2 triggered mobility (LTM) procedure. The method can also include initializing a power ramping counter to a first value based on the first PDCCH order indicating initial preamble transmission. The method can additionally include receiving, after completing the first RA procedure, a second PDCCH order initiating a second RA procedure for the candidate cell. The method can also include, in response to receiving the second PDCCH order, initializing a preamble transmission counter. The method can further include incrementing the power ramping counter from the first value to a second value based on the second PDCCH order indicating preamble retransmission.