Cell Selection Using Slice Assistance Information in 5G Networks
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Solution Overview
Problem
In 5G New Radio systems, terminals face low reliability when accessing cells due to uncertainty about network slice support, leading to potential failures in cell selection.
Innovation Solution
The method involves obtaining cell assistance information and slice assistance information to facilitate reliable cell selection, with the core network sending slice assistance information to terminals and access networks providing cell assistance information to help terminals choose suitable cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal performs cell selection without slice assistance information, then the cell selection process is simple, but the reliability of accessing the cell is low
Solution Approach 1:
The core network device performs preliminary action by determining slice assistance information that indicates which network slices are supported by access network devices before the terminal performs cell selection. This pre-prepared information is provided to the terminal in advance, enabling the terminal to make informed cell selection decisions without increasing its own complexity, thereby improving access reliability.
Solution Approach 2:
Slice assistance information acts as an intermediary that bridges the terminal and the access network devices. The core network device generates this intermediate information that translates network slice support capabilities into a format the terminal can use for cell selection, resolving the contradiction by adding a lightweight information layer without significantly increasing overall system complexity.
2Reliability
If the terminal uses slice assistance information for cell selection, then the access success rate improves, but the information processing requirement increases
Solution Approach 1:
The core network device extracts only the essential slice assistance information needed for cell selection from the complete network state, rather than providing all available information. This extracted information is sufficient for the terminal to perform reliable cell selection without overwhelming it with unnecessary data, thus improving access success rate while minimizing information processing requirements.
3Reliability
If the core network device provides slice assistance information to all terminals, then the overall network access reliability improves, but the network signaling overhead increases
Solution Approach 1:
The slice assistance information is designed to be universally applicable to multiple terminals simultaneously. The core network device determines and broadcasts this information in a manner that serves all terminals in the network, allowing the same information to improve access reliability for numerous terminals without proportionally increasing signaling overhead, as the information is shared rather than individually transmitted.
Data Source
AI summary
A cell selection method, a cell selection control method and a related device are provided. The cell selection method includes: obtaining cell assistance information of an access network; and performing a cell selection based on the cell assistance information and slice assistance information. The slice assistance information is used to assist in performing the cell selection.