Conditional Secondary Node Addition via Reused Handover Procedures
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Solution Overview
Problem
Current wireless communication systems, particularly in new radio (NR) technology, face challenges in efficiently managing secondary node additions and changes due to limitations in conditional handover procedures, which affect communication quality and latency in 5G networks.
Innovation Solution
The implementation of methods and apparatus for conditional secondary node (SN) addition and change by reusing conditional handover (CHO) procedures, where user equipment (UE), master nodes (MN), and secondary nodes (SN) communicate to identify and configure candidate cells based on execution criteria, optimizing handover processes to reduce latency and improve communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conditional handover procedures are reused for secondary node addition and change, then communication efficiency is improved and latency is reduced, but the complexity of managing candidate cells and execution criteria increases
Solution Approach 1:
The patent applies universality by enabling the conditional handover (CHO) procedure to serve multiple functions: it is reused not only for traditional handover scenarios but also for secondary node addition and change operations. This multi-functional approach allows the same CHO mechanism to handle diverse mobility and network configuration needs, improving communication efficiency while avoiding the need for separate specialized procedures for each scenario.
Solution Approach 2:
The patent implements preliminary action by identifying and configuring candidate cells in advance before actual handover or secondary node addition is needed. The network prepares execution criteria and candidate cell configurations beforehand, so when handover or SN addition is triggered, the process can execute immediately using pre-configured parameters, thereby reducing latency and improving communication efficiency.
2Measurement precision
If candidate cells are identified based on execution criteria, then handover accuracy is improved, but the time required for evaluation and selection increases
Solution Approach 1:
The patent applies preliminary action by pre-identifying candidate cells and configuring their execution criteria before handover is actually needed. The network evaluates and prepares multiple candidate cells in advance, storing their configurations and criteria. When handover is triggered, the UE can quickly match current conditions against pre-configured criteria, achieving both accurate selection and fast execution without real-time evaluation delays.
Solution Approach 2:
The patent implements segmentation by dividing the handover process into distinct phases: candidate cell identification, criteria configuration, and execution triggering. By segmenting the complex evaluation process, the system can perform detailed accuracy-based selection during the identification phase, then rapidly execute handover by simply matching pre-configured criteria during the triggering phase, thus resolving the contradiction between selection accuracy and execution speed.
Data Source
AI summary
Aspects of the present disclosure relate to wireless communications, and more particularly, to procedures for supporting conditional new radio (NR) secondary node (SN) addition and change by using conditional handover (CHO) procedures. A method that may be performed by a user equipment (UE) includes receiving, from a master node (MN), configuration information, identifying a set of candidate cells for a conditional addition or change of a SN for a the UE based on execution criteria, detecting the execution criteria is met for one of the candidate cells, and taking action to add or change to the candidate cell as an SN based on the detection.