UE SN RRC Message Handling During PSCell Change
Solution Overview
Problem
In New Radio (NR) systems with Multi-RAT Dual Connectivity, the network side cannot accurately control Primary Secondary Cell (PSCell) changes, leading to issues with processing Secondary Node Radio Resource Control (SN RRC) messages during PSCell changes, causing conflicts and increased hardware complexity and power consumption in User Equipment (UE).
Innovation Solution
The UE method involves stopping the reception of SN RRC messages from the source SN during PSCell changes and receiving and processing SN RRC messages from the source Master Node (MN), allowing the UE to ignore or respond to these messages based on their type, thereby avoiding conflicts and reducing hardware complexity and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continues to receive SN RRC messages from the source SN during PSCell change, then the network can maintain control, but conflicts occur and hardware complexity increases
Solution Approach 1:
The patent extracts the problematic SN RRC message reception function during PSCell change by introducing a flag mechanism. When PSCell change is detected, the UE stops receiving SN RRC messages from the source SN (extracting this function from normal operation), thereby avoiding conflicts and reducing the need for additional hardware capabilities while maintaining reliable network-controlled PSCell changes.
2Device complexity
If the UE stops receiving SN RRC messages during PSCell change, then conflicts are avoided, but network control accuracy may be affected
Solution Approach 1:
The patent implements feedback through the flag mechanism that tracks whether the UE has received SN RRC messages during PSCell change. The UE reports this status back to the network, allowing the network to adjust its behavior accordingly. This feedback loop maintains network control accuracy while avoiding the complexity of continuously filtering and processing SN RRC messages during the transition period.
3Loss of information
If additional RF channels are added to monitor SN RRC messages, then message reception is ensured, but power consumption increases
Solution Approach 1:
Instead of continuously monitoring SN RRC messages through additional RF channels, the patent employs periodic action by only receiving SN RRC messages at specific moments (when the PSCell change flag is not set). During PSCell change, the UE periodically checks the flag and only receives messages when appropriate, eliminating the need for continuous additional monitoring and reducing power consumption while maintaining information reception completeness.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Disclosed are a method, apparatus and device for processing an SN RRC message, and a storage medium, wherein same are applied to a communication system. The method comprises: an access network device sending configuration parameters of an RO, wherein the configuration parameters comprise: an offset value of a start position of a shared RO relative to a start position of an RO used for four-step random access, and the shared RO is an RO shared by the four-step random access and two-step random access; and a terminal receiving the configuration parameters of the RO, and determining, according to the configuration parameters of the RO, a frequency domain position of the shared RO. The present application realizes the flexible configuration of a shared RO at different frequency domain positions, thereby improving the flexibility of a configuration mode.