Synchronizing L3 and L1 Measurements for Wireless Handover
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Solution Overview
Problem
Current methodologies for handling layer 3 (L3) handover and layer 1/layer 2 (L1/L2) Triggered Mobility (LTM) measurements in wireless networks operate independently, leading to potential failures and performance issues due to undesirable CU or DU switches.
Innovation Solution
A method and user equipment (UE) for synchronizing L3 and L1 measurements, where the UE receives L3 and LTM measurement reporting configurations, determines whether the measurements meet specific criteria, and transmits the reports to the appropriate network units, ensuring optimal handover decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If L3 and L1 measurements operate independently without synchronization, then each measurement procedure can function autonomously, but this leads to potential failures and performance issues due to undesirable CU or DU switches
Solution Approach 1:
The patent merges L3 and L1 measurement procedures by introducing a synchronization mechanism where the CU coordinates L3 measurement reporting with L1 measurement configurations. The CU receives L1 measurement reports from the DU and uses this information to make informed L3 handover decisions, combining the autonomous capabilities of both measurement types while ensuring they work together harmoniously to prevent failures.
2Adaptability or versatility
If L3 handover decision is made by CU and LTM decision is taken by DU without interdependence, then decision-making is distributed, but this complete independence poses a risk of failure due to undesirable switches
Solution Approach 1:
The patent implements a feedback loop where the CU receives L1 measurement reports from the DU and uses this feedback to make informed L3 handover decisions. The CU configures L3 measurement reporting based on L1 measurement states, and the DU provides continuous measurement feedback to the CU, ensuring that distributed decision-making remains coordinated and reliable.
Solution Approach 2:
The CU acts as an intermediary that coordinates between the DU's L1 measurements and the overall L3 handover decision-making process. The CU receives L1 measurement reports from the DU, processes this information, and uses it to configure L3 measurement reporting and make final handover decisions, mediating between the distributed components to ensure reliability.
3Adaptability or versatility
If L3 measurement reporting configuration and LTM measurement reporting configuration are received separately, then configuration flexibility is maintained, but coordination between measurements is lost
Solution Approach 1:
The patent applies preliminary action by having the CU configure L3 measurement reporting based on the current L1 measurement state before handover decisions are made. The CU proactively adjusts L3 measurement configurations according to L1 measurement reports, ensuring that both measurement types are coordinated from the outset rather than reacting to conflicts after they arise.
Data Source
AI summary
Handling layer 3 handover and layer 1/layer 2 Triggered Mobility (LTM) measurement in a wireless network is provided. The method performed by a user equipment (UE) includes receiving layer 3 measurement reporting configuration and LTM measurement reporting configuration from a centralized unit (CU) in the wireless network; determining layer 3 measurement for cell at the layer 1 of the UE based on the layer 3 measurement reporting configuration, and LTM measurement for cell at the layer 1 of the UE based on the LTM measurement reporting configuration; determining whether the layer 3 measurement meets layer 3 measurement reporting criteria, and whether the LTM measurement meets LTM measurement reporting criteria; and transmitting one of the layer 3 measurement to the CU, or the LTM measurement to a distributed unit (DU).