Semi-Idle Mobile Terminal Handover via Pre-Configured Candidate Cells
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Solution Overview
Problem
Mobile terminals often experience connection failures and degraded data throughput due to bad radio conditions at cell edges, leading to prolonged handover failures and increased power consumption, especially when network-provided DRX configurations are non-optimal.
Innovation Solution
Implementing semi-autonomous mobility and semi-idle states in mobile terminals, allowing for handover and cell changes without explicit handover signaling, based on radio conditions and triggers like RSRP/RSRQ measurements, reducing power consumption and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile terminal enters idle state after connection failure, then the mobile terminal can perform cell selection procedure, but the connection restoration time increases and data throughput degrades
Solution Approach 1:
The network pre-configures the mobile terminal with a list of candidate cells and handover parameters before connection failure occurs. When radio link failure happens, the terminal can immediately execute handover to a pre-selected candidate cell without performing full cell selection procedure, significantly reducing connection restoration time while maintaining reliability
2Reliability
If the mobile terminal performs conventional handover procedure with explicit signaling, then the handover can be network-controlled, but the signaling overhead increases and power consumption increases
Solution Approach 1:
The mobile terminal is empowered to autonomously execute handover to pre-configured candidate cells based on measurement triggers without requiring explicit handover commands from the network. The terminal independently monitors radio conditions, evaluates candidate cells, and performs handover autonomously, eliminating extensive signaling exchanges and reducing power consumption while maintaining handover reliability through pre-configured network parameters
3Use of energy by moving object
If the network provides DRX configuration, then the mobile terminal can reduce power consumption, but the configuration may be non-optimal leading to excessive power drain
Solution Approach 1:
The network pre-configures multiple DRX parameter sets and candidate cell information before the mobile terminal enters idle state. Based on pre-configured measurement triggers and radio condition evaluations, the terminal can select and apply the most appropriate DRX configuration for current conditions, ensuring optimal power savings without relying on potentially suboptimal network-provided single configuration
Data Source
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AI summary
In accordance with an example embodiment of the present invention, a method comprises determining measurement reporting trigger conditions of at least one of a configured cell, a configured frequency or a configured radio access technology; determining whether a threshold has been met based on the measurement reporting trigger conditions with respect to the at least one of the configured cell, the configured frequency or the configured radio access technology; and causing a handover to a candidate cell in an instance in which a threshold is satisfied. Related apparatus and computer program product are also described.