WTRU PDU Session Management for 5G IoT Resource Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face inefficiencies in managing PDU sessions during transitions between active and inactive states, particularly in 5G networks, leading to suboptimal resource allocation and increased latency due to the lack of efficient mechanisms for suspending and resuming user plane sessions.
Innovation Solution
A wireless transmit/receive unit (WTRU) sends a connection resume message to a radio access network (RAN) node to deactivate unnecessary PDU sessions, allowing for local release of user plane resources and potentially switching to another RAN node, thereby optimizing resource management and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the WTRU maintains all established PDU sessions during transition to inactive state, then session continuity is preserved, but network resources are wasted and latency increases
Solution Approach 1:
The patent segments the set of PDU sessions into two categories: active sessions that are maintained and inactive sessions that are released. The WTRU and network selectively preserve only those PDU sessions that are currently active, while releasing resources for inactive ones. This segmentation allows the system to maintain session continuity for active sessions while freeing network resources, directly resolving the contradiction between reliability and resource utilization.
2Loss of energy
If the WTRU releases user plane resources during inactive state, then resource utilization is optimized, but session resumption latency increases
Solution Approach 1:
The patent implements preliminary action by performing resource release during the transition to inactive state, before any resumption is needed. The WTRU and network proactively release user plane resources for inactive PDU sessions during the state transition, rather than waiting until resumption is required. This preliminary resource management reduces the time and complexity of resource re-establishment during resumption, thereby optimizing resource utilization without significantly increasing resumption latency.
3Adaptability or versatility
If the WTRU performs new registration procedure via another RAN node, then network mobility is improved, but signaling overhead and latency increase
Solution Approach 1:
The patent applies local quality by making the registration procedure selective rather than universal. Instead of requiring new registration for all PDU sessions when moving to a new RAN node, the system performs new registration only for specific PDU sessions that need to be re-established, while maintaining existing registrations for sessions that can be preserved. This localized approach to registration reduces overall signaling overhead while still enabling network mobility, directly addressing the contradiction between adaptability and device complexity.
Data Source
AI summary
A wireless transmit/receive unit (WTRU) may establish one or more protocol data unit (PDU) sessions via a radio access network (RAN) node. The WTRU may transition to an inactive state. The WTRU may send a connection resume message to a RAN node that indicates a request to resume the established plurality of PDU sessions via the RAN node. The WTRU may receive a message from the RAN node. For example, the RAN node may send a message indicating a subset of the plurality of PDU sessions that are available upon resuming a connection with the RAN node. The WTRU may deactivate at least one established PDU session of the plurality of PDU sessions based on the received message from the RAN node that indicates at least one established PDU session not being included in the subset of the plurality of PDU sessions that are available.