Restricted PDU Session Policy Control for Localized Service Access
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Solution Overview
Problem
Existing wireless communication systems lack mechanisms for a user equipment (UE) to request credentials for localized services on-demand from a hosting network, especially in areas where regular network connectivity is unavailable, and there is no standardized method for establishing a restricted PDU session for accessing such services.
Innovation Solution
A method and apparatus for policy control in a wireless communication system that allows a UE to transmit information representing a localized service to an access and mobility management function (AMF), receive policy information, and establish a PDU session request message based on this information, involving the AMF, session management function (SMF), and policy and control function (PCF) to facilitate access to localized services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE attempts to access localized services in areas where regular network connectivity is unavailable, then service availability is improved, but network security and access control may be compromised without proper credential verification mechanisms
Solution Approach 1:
The network performs preliminary authentication and credential verification before granting access to localized services. The AMF obtains credentials for the UE beforehand through the N1N interface, and validates these credentials during the PDU session establishment process, ensuring security is established before service access is permitted.
Solution Approach 2:
The AMF acts as an intermediary between the UE and the localized service network. It mediates the authentication process by obtaining credentials from the hosting network and validating them before allowing the UE to establish a restricted PDU session, thus securing access without preventing service availability.
2Ease of operation
If a standardized mechanism for on-demand credential acquisition is implemented, then user convenience is improved, but system complexity increases due to additional signaling and protocol requirements
Solution Approach 1:
The solution utilizes existing multi-functional network elements and interfaces. The AMF, which already performs mobility management and session management, is extended to also handle credential acquisition through the N1N interface. The PDU session establishment procedure is enhanced to include credential verification, reusing existing signaling pathways rather than creating entirely new protocols.
Solution Approach 2:
The UE autonomously initiates the credential acquisition process by including the localized service identifier in its registration request or PDU session establishment request. The network automatically processes the credential verification without requiring manual user intervention, making the system convenient to use while maintaining standardized procedures.
3Reliability
If a restricted PDU session is established for localized service access, then service security is improved, but session establishment time increases due to additional authentication steps
Solution Approach 1:
Credentials are obtained and validated in advance during the registration phase or before PDU session establishment. The AMF secures the credentials for the UE through the N1N interface beforehand, so that when the UE requests a restricted PDU session, the verification process is expedited, reducing the time penalty for enhanced security.
4Adaptability or versatility
If on-demand credential acquisition is enabled, then service accessibility in remote areas is improved, but network resource consumption increases due to additional signaling between network functions
Solution Approach 1:
The credential acquisition and verification process is extracted as a separate, standardized function performed through the N1N interface between the AMF and the hosting network. This modular approach allows credential management to be handled efficiently by dedicated network elements, reducing redundant signaling and optimizing network resource utilization while enabling broad service accessibility.
Data Source
AI summary
The disclosure provides a method and apparatus for policy control for a restricted protocol data unit (PDU) session in a wireless communication system supporting a localized service. According to an embodiment, a method performed by a user equipment (UE) in a wireless communication system supporting a localized service is provided, the method comprises transmitting, to an access and mobility management function (AMF) of a hosting network providing the localized service, a first message including information related to the localized service, receiving, from the AMF, a second message including policy information related to the localized service, the policy information including UE route selection policy (URSP) rules related to the localized service, and transmitting, a session management function (SMF) via the AMF, a PDU session request message including information representing the localized service, based on the policy information.