Access Device Core Network Selection for LTE NR Coexistence
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Solution Overview
Problem
In scenarios where both LTE and NR systems coexist, existing methods cannot accurately determine which core network to connect a terminal device to, leading to challenges in network access.
Innovation Solution
An access device connects to at least two different core networks and determines the type of terminal device based on messages such as preamble sequences, RRC connection request messages, or RRC connection setup complete messages, containing indication information to identify the type of terminal device and subsequently connect it to the appropriate core network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an access device connects to multiple core networks to support both LTE and NR systems, then the system adaptability and service coverage are improved, but the complexity of determining the target core network increases
Solution Approach 1:
The terminal device performs preliminary classification by selecting and sending specific preamble sequences or including capability indication information in RRC messages before the access device needs to make the determination. This advance preparation eliminates the need for complex real-time analysis at the access device, resolving the contradiction between supporting multiple networks and maintaining simple determination logic.
Solution Approach 2:
The patent introduces indication information (such as specific preamble sequences or capability indication fields in RRC messages) as an intermediary carrier that conveys terminal device type information from the terminal to the access device. This intermediary mechanism simplifies the determination process by providing clear, pre-formatted classification data rather than requiring complex analysis of terminal characteristics.
2Ease of operation
If the access device uses prior-art methods to identify terminal devices, then the operation process is simple, but the precision of determining the target core network deteriorates
Solution Approach 1:
The patent uses different preamble sequences (analogous to different colors or markers) to represent different terminal device types or capability categories. The access device simply needs to identify which preamble sequence was sent to determine the terminal type and appropriate core network, maintaining operational simplicity while achieving precise identification through distinct, easily distinguishable signals.
Solution Approach 2:
The terminal device pre-classifies itself by selecting appropriate preamble sequences or preparing capability indication information before accessing the network. This preliminary action ensures that when the access device receives the message, it can immediately and accurately determine the terminal type without complex analysis, thus maintaining both operational simplicity and identification precision.
Data Source
AI summary
This application provides a network access method, an access device, and a terminal device. The access device is connected to at least two different types of core networks. When the terminal device is to connect to a core network, the terminal device sends, to the access device, a first message used to indicate a type of the terminal device. The access device determines the type of the terminal device based on the first message, and determines, based on the type of the terminal device, a target core network to be connected by the terminal device, so that the access device accurately connects the terminal device to the target core network.