L1/L2 Triggered Mobility Control with Early Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing 5G wireless communication systems face challenges in managing increased communication traffic and require efficient mobility management between different base stations, particularly in inter-gNB-CU scenarios, leading to increased interruption times and lack of early synchronization support.
Innovation Solution
A method and apparatus for controlling Layer 1/Layer 2 Triggered Mobility (LTM) by transmitting an SN addition request message to a candidate SN, receiving an early synchronization configuration, and sending an SN modification request message to a source SN, along with a PDCCH order for contention-free random access, to facilitate seamless handovers between different base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing handover procedures are used in inter-gNB-CU scenarios, then mobility between base stations is achieved, but interruption time increases and early synchronization support is lost
Solution Approach 1:
The patent applies preliminary action by performing early synchronization where the target gNB-CU provides synchronization configuration information to the source gNB-CU before the handover is executed. This allows the UE to synchronize with the target cell in advance, reducing interruption time during the actual handover execution.
Solution Approach 2:
The patent uses the source gNB-CU as an intermediary to transfer early synchronization configuration information from the target gNB-CU to the UE. This intermediary mechanism enables the UE to obtain synchronization parameters before handover, facilitating smoother mobility transitions in inter-gNB-CU scenarios.
2Reliability
If existing handover procedures are used in inter-gNB-CU scenarios, then mobility between base stations is achieved, but early synchronization support is lacking
Solution Approach 1:
The patent implements preliminary action by establishing early synchronization mechanisms where synchronization configuration information is exchanged and prepared before the handover execution. This enables the system to adapt to inter-gNB-CU scenarios by providing synchronization support in advance, enhancing overall mobility management reliability.
3Productivity
If LTM is extended to inter-gNB-CU scenarios, then mobility efficiency is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by designing a handover mechanism that works both within single gNB-CU scenarios and across inter-gNB-CU scenarios. The early synchronization configuration information mechanism provides a unified solution that enhances mobility efficiency without requiring entirely separate procedures for different scenarios, thereby limiting the increase in system complexity.
Data Source
AI summary
Disclosed are a method and apparatus for controlling layer 1 (L1)/layer 2 (L2) triggered mobility (LTM) in a wireless communication system. In an LTM procedure, the master node (MN) transmits a secondary node (SN) addition request message to a candidate SN, receives an SN addition request acknowledge message including an early synchronization configuration from the candidate SN, and transmits an SN modification request message including the early synchronization configuration to a source SN in the LTM procedure.