Relay Slice Support Signaling for Accurate Allowed NSSAI
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Solution Overview
Problem
The success rate of requesting network slice services by terminal devices is low due to the core network device's inability to accurately determine if the access network side supports the requested slice service.
Innovation Solution
The communication method involves the second donor node sending information to the core network device indicating that the first relay node supports the first network slice, allowing the core network device to correctly determine that the access network side supports the service, thereby including the network slice identifier in the allowed NSSAI, improving the success rate of service requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the core network device determines network slice support based on tracking area information, then the determination process is simple, but the accuracy of determining whether the access network side supports the requested slice service is low
Solution Approach 1:
The donor node pre-determines whether the relay node supports the network slice before the terminal device makes a service request. The donor node sends indication information to the core network device in advance, allowing the core network device to accurately determine network slice support when processing the request, without adding complex real-time determination processes.
Solution Approach 2:
The donor node acts as an intermediary between the relay node and the core network device. It receives information about the relay node's network slice support capabilities and forwards this information to the core network device, enabling accurate determination of network slice support without requiring the core network device to directly assess the relay node's capabilities.
2Reliability
If the core network device uses the current tracking area to determine slice support, then the determination is quick, but it fails to account for relay nodes that support slices not available in their current tracking area
Solution Approach 1:
The donor node performs preliminary determination of the relay node's network slice support capabilities and sends this information to the core network device before the terminal device's service request is processed. This ensures the core network device has accurate information about which slices are supported, regardless of the current tracking area limitations.
Solution Approach 2:
The determination of network slice support is segmented into two independent parts: (1) the relay node's inherent slice support capabilities, and (2) the tracking area's slice availability. The donor node provides information about the first part, allowing the core network device to make accurate determinations that are not constrained by the second part.
Data Source
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AI summary
This application provides a communication method, including: A terminal device accessing a first relay node sends first information to a core network device, to request, from the core network device, a service corresponding to a first network slice. A second donor node sends second information to the core network device, to indicate to the core network device that the first relay node supports the first network slice, where the first network slice is not supported by a second TA, and a tracking area in which the terminal device is located is the second TA when a donor node of the first relay node is the second donor node. Correspondingly, when the core network device sends first allowed NSSAI to the terminal device based on indication of the second information, the first allowed NSSAI includes an identifier of the first network slice. In this method, because the core network device sends the first allowed NSSAI based on the network slice that is actually supported by the first relay node and that is indicated by the second information, a success rate of requesting the service of the first network slice by the terminal device is improved.