5G UE Service Request Paging Response Handling
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Solution Overview
Problem
In 5G mobile communication systems, the current network architecture is inadequate for handling simultaneous paging messages for both 3GPP and non-3GPP access types, leading to difficulties in determining whether a UE has responded to a paging message, especially when PDU sessions are not transferred to 3GPP access.
Innovation Solution
A method is proposed where a UE, registered in both 3GPP and non-3GPP access within the same PLMN, receives a paging message and initiates a service request procedure by transmitting a message with an empty list of allowed PDU sessions when none are to be reactivated over 3GPP access, using either a 1-bit or 2-bit scheme to indicate access types, allowing for efficient paging management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network transmits paging messages for both 3GPP and non-3GPP access types simultaneously, then the network can reach the UE through multiple access types, but the network cannot determine whether the UE has responded to the paging message
Solution Approach 1:
The Service Request message is segmented to include a separate Allowed PDU Session list that specifically identifies which PDU sessions should be transferred to 3GPP access. This segmentation allows the network to distinguish between PDU sessions that require 3GPP access transfer and those that do not, thereby enabling accurate determination of UE response status for paging messages.
Solution Approach 2:
The UE provides feedback to the network through the Service Request message by including the Allowed PDU Session list. This feedback mechanism allows the network to understand which PDU sessions the UE intends to transfer to 3GPP access, thereby resolving the uncertainty about UE response status when multiple paging messages are transmitted simultaneously.
2Measurement precision
If the UE includes a list of allowed PDU sessions in the service request message, then the network can determine which sessions to transfer to 3GPP access, but the message complexity increases
Solution Approach 1:
The Allowed PDU Session list within the Service Request message serves multiple functions: it identifies PDU sessions for transfer to 3GPP access, confirms UE response to paging messages, and provides session status information. This multi-functionality reduces the need for separate dedicated message structures, thereby managing complexity while maintaining precision.
3Loss of information
If the UE transmits a service request message with an empty list of allowed PDU sessions, then the network knows no PDU sessions are to be reactivated over 3GPP access, but additional signaling is required
Solution Approach 1:
The Service Request message is enhanced with local quality by including the Allowed PDU Session list that provides specific information about PDU session transfer intentions. This localized information quality improvement allows the network to make accurate decisions about PDU session reactivation without requiring additional separate signaling procedures, thereby reducing overall signaling time.
Data Source
AI summary
A disclosure in the present specification provides a method for user equipment initiating a service request procedure. The method includes a step of the UE receiving a paging message. The UE may be registered to both of a 3rd generation partnership project (3GPP) access and a non-3GPP access within the same PLMN. The paging message may include access type information that is used so as to indicate the non-3GPP access. The method may include a step of initiating a UE triggered service request procedure. The UE triggered service request procedure may be initiated by transmitting a service request message including a list of permitted protocol data unit (PDU) sessions. The service request message may include an empty list of the permitted PDU sessions if there is no PDU sessions that can be reactivated in the 3GPP access.