Cell Prioritization for RRC Inactive State Re-selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems lack efficient methods for prioritizing cell selection in next-generation networks, particularly for user equipment (UE) in a Radio Resource Control (RRC) inactive state, leading to suboptimal cell reselection processes.
Innovation Solution
The method involves assigning cell reselection priority levels to candidate cells based on their core network connection support, with cells supporting the 5G core network connection prioritized over those supporting only the Evolved Packet Core (EPC) network, and using offset values to adjust signal strength measurements accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cell reselection is performed without prioritization based on core network connection support, then the cell selection process is simple, but the network connectivity efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring priority levels for candidate cells based on their core network connection support capabilities before the cell reselection process. The UE receives and stores priority information from the network, then uses this pre-established priority data to efficiently select cells without performing complex real-time evaluations during reselection.
Solution Approach 2:
The patent implements parameter changes by introducing a priority level parameter that modifies the cell reselection criteria. Instead of using only traditional signal strength measurements, the system incorporates the priority parameter that reflects core network connection support, thereby changing the selection metric to optimize for network connectivity efficiency.
2Reliability
If UE selects candidate cells without considering core network connection support, then the selection criteria are simple, but the network connectivity performance deteriorates
Solution Approach 1:
The patent changes the cell selection parameter from solely signal strength-based criteria to a composite criterion that includes both signal strength and core network connection support priority. This parameter modification ensures that UEs reliably connect to cells with appropriate network support while maintaining a manageable selection process.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of priority information that is transmitted from the network to the UE. This intermediary data structure serves as a mediator between the complex network capabilities and the simple UE selection process, allowing UEs to make informed decisions without directly evaluating complex network parameters.
3Productivity
If offset values are added to signal strength measurements for 5G core network cells, then 5G cell selection is improved, but the measurement processing complexity increases
Solution Approach 1:
The patent applies parameter changes by introducing offset values that are added to or subtracted from signal strength measurements based on the core network connection type. This modification creates a biased measurement system that naturally favors 5G core network cells in the selection process while keeping the computational operation simple (basic arithmetic addition/subtraction).
Data Source
AI summary
A method for a user equipment (UE) for cell selection while the UE is in a radio resource control (RRC) Inactive state is provided. The method receives, via control signaling, a configuration indicating a target frequency carrier and a corresponding target core network (CN) type. The method then causes the UE to transition from an RRC Connected state to the RRC Inactive state based on the received configuration. While the UE is in the RRC Inactive state, the method selects a suitable cell among a plurality of suitable cells that are associated with the target frequency carrier. The method selects the suitable cell irrespective of the received target CN type.