WTRU Handover Prioritization for Energy-Saving Cell Reselection
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing WTRU mobility and cell reselection in energy savings networks, particularly in handling handovers when source cells enter energy-saving states, leading to inefficiencies and potential service disruptions.
Innovation Solution
The WTRU determines handover conditions based on source cell entering an energy-saving state and receives configuration information for prioritized handover candidates, allowing it to perform handovers to prioritized cells when conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the source cell enters an energy-saving state to reduce energy consumption, then energy efficiency is improved, but handover management becomes more complex and service continuity may be disrupted
Solution Approach 1:
The network configures the WTRU with handover candidate cells and execution conditions before the source cell enters the energy-saving state. This preliminary configuration allows the WTRU to autonomously execute handover when conditions are met, avoiding complex real-time coordination during the energy-saving transition.
Solution Approach 2:
The WTRU autonomously monitors source cell signals, evaluates handover conditions, and executes handover to candidate cells without continuous network intervention. This self-service mechanism reduces the complexity of network-side handover management while maintaining service continuity during energy-saving operations.
2Reliability
If the WTRU performs handover immediately when handover conditions are satisfied, then service continuity is improved, but unnecessary handovers may occur during energy-saving transitions
Solution Approach 1:
The network provides the WTRU with execution conditions that explicitly prevent handover during source cell energy-saving transitions. These preliminary constraints counteract the tendency to perform unnecessary handovers by embedding energy-saving awareness directly in the handover decision logic.
Solution Approach 2:
The WTRU continuously monitors source cell signal quality and compares it against configured thresholds and conditions. This feedback mechanism allows the WTRU to distinguish between genuine handover needs and temporary signal fluctuations during energy-saving operations, executing handover only when truly necessary.
3Adaptability or versatility
If multiple handover candidates are configured with different priorities, then handover selection flexibility is improved, but decision-making complexity increases
Solution Approach 1:
Each handover candidate cell is configured with specific priorities and conditions tailored to its characteristics. The WTRU evaluates candidates locally against these customized parameters, selecting the most appropriate target based on current conditions rather than using a uniform selection criterion.
Solution Approach 2:
The network pre-configures multiple handover candidates with their respective priorities and execution conditions before the WTRU needs to make a handover decision. This preliminary setup simplifies the real-time decision process by providing a ready-made ranked list of candidates with clear selection criteria.
Data Source
AI summary
Systems, methods, and instrumentalities are described herein for WTRU mobility and cell reselection in energy savings networks. Handover associated with network energy savings (NES) may be performed. A wireless transmit/receive unit (WTRU) may perform a handover from a source cell to a target cell, for example, based on determining that the source cell is entering an NES state and based on determining that a handover condition is satisfied. The WTRU may determine that the handover condition is satisfied but refrain from performing handover until a determination that the source cell is entering an NES state.