Terminal Device Restricted Service Access in 5G NPN
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Solution Overview
Problem
In 5G communication systems, particularly in Non-public Networks (NPNs), there is a challenge in controlling terminal devices to receive restricted services such as emergency communication and Public Warning System (PWS) services, especially when the network is in Stand-alone Non-public Network (SNPN) mode, as these services were not initially supported and require specific conditions to be met for service availability.
Innovation Solution
A method where terminal devices determine whether to use restricted services based on the network type supported by the cell, with specific conditions indicated by network device messages, allowing devices to assess their capability to initiate or receive emergency communication and PWS services only when the cell supports the necessary network features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal devices are allowed to access restricted services in SNPN mode, then service availability is improved, but network security and control are worsened
Solution Approach 1:
The patent applies preliminary action by having the network device broadcast capability indication information in advance before terminal devices attempt to access restricted services. The terminal devices check this pre-broadcast information (SNPN capability indication and restricted service indication) before initiating service access, preventing unauthorized access attempts before they occur.
Solution Approach 2:
The patent implements feedback through the network device broadcasting capability indication information that terminal devices use to determine whether to access restricted services. The terminal devices receive feedback from the network about their capability status and use this information to make informed decisions about service access, creating a controlled feedback loop.
2Adaptability or versatility
If terminal devices without NPN support or in non-SNPN mode can access restricted services, then service coverage is improved, but network control is worsened
Solution Approach 1:
The patent applies local quality by differentiating the service access rights of different terminal devices based on their specific capabilities and modes. Terminal devices are categorized into different groups (SNPN mode vs. non-SNPN mode, with or without NPN support) and are granted different access permissions accordingly, allowing precise local control over service availability for each device type.
Solution Approach 2:
The patent implements universality by creating a unified broadcast mechanism that serves multiple purposes: it informs terminal devices about SNPN capability, restricted service availability, and access conditions all in one broadcast message. This single broadcast mechanism handles multiple control functions for different terminal device types without requiring separate control mechanisms for each.
3Ease of operation
If capability indication information is broadcast for every cell, then terminal device decision-making is improved, but network overhead is worsened
Solution Approach 1:
The patent merges multiple control information elements into a single broadcast message structure. The capability indication information, SNPN capability indication, and restricted service indication are combined in one broadcast transmission, allowing terminal devices to make informed decisions without requiring multiple separate broadcast messages, thus reducing overall network overhead.
Data Source
AI summary
The present application relates to a restricted service processing method, a terminal device, a network device, a chip, a computer-readable storage medium, a computer program product, a computer program and a communication system. The method includes: a terminal device determines, on the basis of a network type supported by a cell, whether to use a restricted service provided by the cell, wherein the terminal device includes a first terminal device which supports an NPN function but is not in an SNPN mode, and/or a second terminal device which does not support the NPN function.