Network Slice Priority Signaling for UE Cell Reselection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently selecting and reselecting access networks based on the mobility, idle, or inactive states of user equipment (UE) and the varying network slices and services requested, particularly in 5G and NR systems with separated mobility and session management entities.
Innovation Solution
The method involves receiving and transmitting information about network slices, including priority information, at the NAS layer to support efficient network selection and reselection by the UE, AMF, and base station, utilizing the NAS and AS layers for cell selection or reselection based on network slice information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network selection is performed without considering network slice information, then the selection process is simple and fast, but the service quality and resource allocation efficiency are poor
Solution Approach 1:
The patent applies preliminary action by having the base station transmit network slice information to the terminal in advance through system information blocks (SIB) or dedicated signaling before the terminal performs network selection. This allows the terminal to have network slice information available when making selection decisions, improving service quality without requiring complex real-time analysis during the selection process itself
Solution Approach 2:
The patent uses the base station as an intermediary that collects network slice information from the core network and makes it available to terminals. The base station acts as a mediator between the core network's slice management functions and the terminal's selection processes, enabling quality service delivery without directly complicating the terminal's selection logic
2Measurement precision
If the terminal continuously monitors all network parameters for optimal selection, then the selection accuracy is high, but the energy consumption and processing time increase
Solution Approach 1:
The patent extracts only the essential network slice information needed for selection decisions from the complete set of available network parameters. By focusing on specific slice-related parameters (such as slice identifiers, priority levels, and service type associations) rather than monitoring all possible network parameters, the terminal achieves sufficient selection accuracy with reduced processing time and lower energy consumption
3Adaptability or versatility
If the system supports multiple network slices with different priorities, then the service differentiation is improved, but the network selection complexity increases
Solution Approach 1:
The patent applies local quality by associating different priority levels and characteristics with specific network slices based on their service types (e.g., enhanced mobile broadband, ultra-reliable low-latency communication, massive machine-type communications). The terminal applies different selection criteria locally to different slices based on their priorities, enabling service differentiation while maintaining relatively simple overall selection logic through the use of priority-based filtering and matching rules
Data Source
AI summary
The present disclosure relates to a method for selecting a network by a terminal. The method may comprise receiving information about a network slice from a base station, wherein the information about the network slice includes at least one of information about a group of the network slice, information about priority of the network slice, and information about priority of the group of the network slice-; and performing cell selection or cell reselection based on the received information about the network slice.