Conditional PSCell Configuration for Low-Latency 5G Mobility
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Solution Overview
Problem
Existing systems face challenges in efficiently managing conditional primary cell group (PSCell) additions and changes in 5G NR networks, particularly in ensuring high reliability and minimal latency during handovers.
Innovation Solution
A system and method where a master node (MN) manages the configuration and execution of conditional PSCell addition or change (CPAC) procedures by sending requests and messages to secondary nodes (SNs) with defined conditions, allowing for efficient resource management and optimization of PSCell configurations based on measurement results and execution conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditional PSCell addition or change procedures are implemented to improve mobility reliability, then the number of signaling messages and coordination steps between network nodes increases, leading to higher system complexity
Solution Approach 1:
The patent implements conditional PSCell addition or change by pre-configuring candidate PSCells and their execution conditions before handover is needed. The source SN prepares candidate cells in advance, and the UE receives configurations with associated execution conditions. When conditions are met, the UE autonomously executes the handover to the pre-configured candidate PSCell, avoiding the need for extensive real-time signaling during the actual handover event.
Solution Approach 2:
The patent introduces a conditional execution mechanism as an intermediary between the source SN and target SN. Instead of direct real-time coordination between SNs during handover, the source SN sends candidate PSCell configurations with execution conditions to the UE. The UE acts as an intermediary that monitors conditions and autonomously triggers handover when appropriate, reducing the signaling burden on the network infrastructure.
2Reliability
If multiple candidate PSCells are configured with execution conditions to enhance mobility performance, then the configuration management and resource allocation overhead increases
Solution Approach 1:
The patent applies local quality by configuring different candidate PSCells with specific execution conditions tailored to local network conditions and UE capabilities. Each candidate PSCell configuration includes localized parameters such as measurement thresholds, event triggers, and condition-specific settings. This allows the system to optimize handover decisions based on local conditions without requiring global reconfiguration of all candidate cells.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting execution conditions based on measured quantities such as RSRP, RSRQ, and SINR. The source SN configures execution conditions with specific parameter thresholds, and the UE monitors these parameters in real-time. When parameters change and meet the configured conditions, the UE executes the handover. This allows flexible adaptation to changing radio conditions without requiring manual reconfiguration of candidate PSCells.
Data Source
AI summary
A master node (MN) may send a secondary node (SN) addition request message to a target SN with an indication of a maximum number of candidate PSCells that can be configured by the target SN. The MN may receive an SN addition request acknowledge message with at least one candidate PSCell configuration from the target SN in response to the SN addition request message. The MN may send, if data forwarding is needed, a data forwarding message with an indication that the data forwarding is for a CPAC based procedure to a source SN. The MN may send a RRC message to a wireless communication device including the at least one candidate PSCell configuration and one or more associated CPAC execution conditions.