Adaptable PDU Session Modes for Low Latency and Power Saving
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in energy consumption and latency when establishing protocol data unit (PDU) sessions, particularly in transitions between different radio access technologies (RATs like 5G NR and LTE, due to always-on PDU sessions consuming unnecessary energy and non-always-on sessions introducing latency.
Innovation Solution
Adaptive PDU session management that allows a UE to dynamically switch between always-on and non-always-on modes based on energy-saving or low-latency preferences, using an adaptable PDU session technique to mimic always-on sessions when necessary and conserve energy by falling back to non-always-on sessions when energy is a priority.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If always-on PDU sessions are used, then latency is reduced, but energy consumption increases
Solution Approach 1:
The patent implements dynamic PDU session management where the UE can switch between always-on and non-always-on modes based on current energy mode preferences. The session management function dynamically adjusts the activation state of user plane connections, transitioning from static always-on configuration to adaptive dynamic control that responds to changing operational conditions.
Solution Approach 2:
The patent changes the operational parameters of PDU sessions by introducing an energy mode parameter that controls session behavior. When energy-saving mode is activated, the system modifies session parameters to use non-always-on PDU sessions, thereby adjusting the operational characteristics to balance latency and energy consumption based on current system state.
2Use of energy by moving object
If non-always-on PDU sessions are used, then energy consumption is reduced, but latency increases
Solution Approach 1:
The system dynamically adjusts PDU session activation based on real-time energy mode preferences. When energy-saving mode is enabled, the UE requests non-always-on PDU sessions that activate user plane connections only when needed, dynamically balancing energy savings against potential latency increases based on current operational requirements.
Solution Approach 2:
The patent implements preliminary configuration where the UE indicates its energy mode preference to the network before PDU session establishment. This allows the network to pre-configure appropriate session types (always-on or non-always-on) based on anticipated energy constraints, preventing latency issues by preparing the appropriate session mode in advance.
3Reliability
If UP connections are established for all active PDN connections, then connectivity reliability is improved, but energy consumption increases
Solution Approach 1:
The patent applies local quality by establishing user plane connections selectively for specific PDU sessions rather than uniformly for all PDN connections. The system determines which individual sessions require active connections based on energy mode preferences, applying different connection states to different sessions locally rather than globally, thereby maintaining necessary connectivity while reducing overall energy consumption.
Solution Approach 2:
The patent segments the PDN connections into individual PDU sessions with independent user plane connection management. Instead of establishing UP connections for all connections simultaneously, the system divides and manages each session's connectivity independently, allowing selective activation of connections based on specific session requirements and energy constraints.
Data Source
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AI summary
A user equipment (UE) determines that a protocol data unit (PDU) session comprises an adaptable PDU session. The UE determines whether a current energy mode of the UE comprises an energy-saving mode. In response to determining that the current energy mode of the UE comprises the energy-saving mode, the UE establishes the adaptable PDU session in a non-always-on mode; and in response to determining that the current energy mode of the UE does not comprise the energy-saving mode, the UE establishes the adaptable PDU session in an always-on mode. Further, the UE can initially establish a mode of a plurality of adaptable PDU sessions as the non-always-on mode, when connecting to a certain type of network.