Non-3GPP PDU Session Handover via 3GPP Control Plane
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Solution Overview
Problem
User equipment (UE) experiences connection failures when trying to establish user-plane resources over 3GPP access networks after leaving the coverage area of non-3GPP access networks, leading to failed data packet reception and poor user experience.
Innovation Solution
A communications apparatus with a transceiver and processor that establishes 3GPP and non-3GPP PDU sessions, uses 5G Mobility Management protocol to reestablish user plane resources by sending service request messages over the 3GPP control plane, enabling handover of non-3GPP PDU sessions to 3GPP access networks when user-plane resources cannot be reestablished.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE tries to establish user-plane resources over 3GPP access network after leaving non-3GPP coverage, then connectivity can be maintained, but the connection establishment may fail leading to poor user experience
Solution Approach 1:
The patent implements dynamic connection management by allowing the UE to transition between CM-IDLE and CM-CONNECTED states in the 3GPP access network based on data reception needs. When downlink data is detected for a non-3GPP PDU session, the UE dynamically establishes user-plane resources over 3GPP access, and can release them when no longer needed, optimizing both reliability and resource efficiency
Solution Approach 2:
The patent changes the access network parameter from non-3GPP to 3GPP when the UE leaves non-3GPP coverage area. By modifying the access type parameter and establishing PDU sessions over 3GPP access network, the system maintains connectivity reliability while adapting to changing environmental conditions
2Adaptability or versatility
If the UE establishes both 3GPP and non-3GPP PDU sessions, then network versatility is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by enabling the UE to establish and manage both 3GPP PDU sessions and non-3GPP PDU sessions simultaneously. The same UE can maintain connectivity over different access networks (3GPP and non-3GPP) and switch between them based on availability, making the device universally adaptable to various network conditions without requiring separate dedicated systems for each access type
Solution Approach 2:
The patent uses the 3GPP access network as an intermediary to deliver data for non-3GPP PDU sessions when the UE is in CM-IDLE state. Instead of directly managing complex interactions between non-3GPP data packets and the UE, the system uses 3GPP user-plane resources as a mediator to transport the data, simplifying the overall session management architecture
Data Source
AI summary
A connection recovery method for recovering a connection between a communications apparatus and a data network includes: receiving a first message indicating a non-3GPP access from the 3GPP network device in a CM-IDLE state in the non-3GPP access network; transmitting a second message to the 3GPP network device via 5GMM protocol over 3GPP control plane to establish the user plane resources for the non-3GPP PDU session; receiving a third message indicating that the user plane resources cannot be reestablished; and transmitting to the 3GPP network device a service request message via the 5GMM protocol over the 3GPP Internet PDU session of 3GPP user plane to reestablish the user plane resources, or a PDU session establishment request message via 5GSM protocol over the 3GPP control plane to handover the non-3GPP PDU session from the non-3GPP access network to the 3GPP access network in response to the third message.