User Equipment Mobility State Reporting for Handover Optimization
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Solution Overview
Problem
In wireless communication systems, fast-moving user equipment (UE) in RRC idle mode transitions to connected mode without providing optimal neighbor cell reports, hindering network management of handovers.
Innovation Solution
The UE determines and reports its mobility state during RRC connection establishment, enabling the network to optimize measurement and reporting parameters based on the UE's speed, thereby improving handover management and service setup efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fast moving UE in idle mode transitions to connected mode without reporting mobility state, then the connection establishment is simple and quick, but the network cannot optimize measurement and reporting parameters for proper handover management
Solution Approach 1:
The UE determines its mobility state (idle, medium mobility, or high mobility) in advance during the connection establishment process by counting cell reselections within a time window, and includes this information in the RRCConnectionRequest or RRCConnectionSetupComplete message. This preliminary reporting allows the network to proactively configure appropriate measurement and handover parameters before the UE actually needs handover management, resolving the contradiction by preparing optimization data without delaying connection setup.
2Reliability
If the UE reports mobility state during connection establishment, then the network can optimize measurement reports and handover management, but the signaling overhead and processing complexity increase
Solution Approach 1:
The mobility state information is reported only when relevant to the current connection establishment, and the network uses this localized information to configure measurement parameters specifically tailored to that UE's mobility characteristics. The UE calculates cell reselection counts locally and reports only the determined mobility state category rather than raw measurement data, reducing signaling overhead while enabling targeted optimization of handover management for each UE's specific mobility pattern.
3Reliability
If the network configures frequent measurement reports for fast moving UEs, then handover management improves, but energy consumption and signaling overhead increase
Solution Approach 1:
The network dynamically adjusts measurement reporting frequency and parameters based on the UE's reported mobility state. For UEs in high mobility state, the network configures more frequent and comprehensive measurements with shorter reporting intervals. For idle or medium mobility UEs, the network uses standard or reduced measurement configurations. This dynamic adaptation ensures optimal handover management for fast-moving UEs while conserving energy and reducing signaling for slower UEs, resolving the contradiction through conditional configuration.
Data Source
AI summary
A user equipment UE reports its mobility state in signaling for establishing, re-establishing, or re-configuring a radio connection between the UE and a network access node. In one embodiment the reported mobility state is selected from among normal; medium and high. In another embodiment the reported mobility state informs of a number of cell changes the UE has performed within a predetermined evaluation period. The UE may also include an indication whether a hysteresis period for entering into a normal mobility state is running for the UE. The network configures the UE in dependence on the reported mobility state, such as setting a parameter for measuring or reporting neighbor cells (e.g., suspend a serving cell quality threshold as a condition for measuring/reporting; limit inter-frequency and/or inter-radio access technology reporting; set a shortest measurement, reporting gap; disable an event trigger; and/or set layer 3 filtering of measurement results for faster reporting).