Distributed Unit Handover via Context Pre-loading
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Solution Overview
Problem
Wireless telecommunication networks face challenges in maintaining seamless communication when user equipment (UE) connects to different radios distributed geographically or operating at different frequency bands, leading to potential connectivity issues and inefficient handover processes.
Innovation Solution
A Distributed Unit (DU) controller (DUC) pre-loads context information onto candidate DUs, allowing for seamless handover by maintaining up-to-date context and traffic information, even before the UE attaches, thereby reducing connectivity interruptions and enhancing network robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If context information is transferred only after UE attachment to target DU, then network resource usage is optimized, but handover speed and service continuity are degraded
Solution Approach 1:
The patent applies preliminary action by transferring context information from the source DU to the target DU before the UE actually attaches to the target DU. The DUC identifies candidate DUs in advance and pre-loads them with necessary context information (UE capabilities, security parameters, QoS profiles), so that when handover is triggered, the target DU is already prepared and can immediately resume service without waiting for context transfer after attachment.
2Reliability
If context information is pre-loaded onto candidate DUs in advance, then handover seamless is improved, but network signaling overhead and processing load increase
Solution Approach 1:
The patent applies local quality by selectively pre-loading context information only onto DUs that are identified as candidates for a specific UE's handover, rather than universally pre-loading all DUs. The DUC assesses which DUs are potential targets based on UE location, signal quality, and load conditions, and only prepares those specific candidates. This localized approach ensures high reliability where needed while minimizing unnecessary processing complexity in other parts of the network.
Solution Approach 2:
The patent applies partial action by transferring only the essential context information needed for immediate handover execution, rather than transferring complete UE profiles. The pre-loaded context includes critical parameters for service continuity (security keys, QoS parameters, UE capabilities) but excludes less critical data, thus achieving seamless handover with reduced processing overhead.
3Adaptability or versatility
If multiple candidate DUs are prepared with context information, then handover robustness is improved, but network resource consumption increases
Solution Approach 1:
The patent applies dynamics by making the candidate DU selection and context pre-loading process adaptive rather than static. The DUC continuously monitors network conditions, UE mobility patterns, and signal quality metrics to dynamically identify which DUs should be prepared as candidates. This dynamic approach ensures that the right number of candidate DUs are prepared based on actual handover probability, improving adaptability while avoiding unnecessary resource consumption for low-probability scenarios.
Data Source
AI summary
A system described herein may provide a technique for the handover of a User Equipment (“UE”) from a first Distributed Unit (“DU”) of a wireless network to a second DU in a manner that minimizes or interruption of the delivery of traffic to the UE. When the UE is attached to a first DU, one or more second DUs may be identified as candidates for attachment to the UE. The one or more second DUs may be pre-loaded with context information and/or traffic for the UE. In some embodiments, a third mesh DU (“MDU”) may be identified as a candidate for attachment to a first MDU that is attached to a second MDU. The third MDU may be pre-loaded with context information and/or traffic for the first MDU.