LTE Mobility State Transmission via Source eNB Analysis
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Solution Overview
Problem
In LTE/LTE-Advanced systems, determining and transmitting the mobility state of User Equipment (UE) during connectivity is challenging, affecting handover decisions and load balancing in self-organization networks, leading to potential service disruptions and reduced customer satisfaction.
Innovation Solution
A method where a source eNB sends UE historical information, including the number and list of recently visited cells, to a target eNB to determine the UE's mobility state, allowing the target eNB to decide and set the corresponding mobility state, either by extracting this information from handover request messages or by the source eNB deciding and sending mobility state instructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE decides its own mobility state based on cell re-selection criteria, then the mobility state can be determined for idle state UEs, but the target eNB cannot acquire the mobility state information for connectivity state UEs during handover
Solution Approach 1:
The source eNB performs preliminary analysis of UE historical information (cell re-selection counts, movement patterns) before handover and pre-determines the mobility state. This preliminary action ensures the mobility state is ready and available when the handover occurs, eliminating information loss during the handover process.
Solution Approach 2:
The source eNB acts as an intermediary that collects and processes UE historical information, analyzes movement patterns, and transmits the determined mobility state to the target eNB. This intermediary role ensures accurate mobility state information is conveyed through the handover signaling without requiring the UE to directly provide this information.
2Reliability
If handover decisions are made without accurate mobility state information, then the handover process can proceed quickly, but handover success rate decreases and unnecessary handovers occur
Solution Approach 1:
The source eNB performs preliminary analysis of UE historical information and determines the mobility state before the handover is executed. This advance determination ensures that accurate mobility state information is available when the handover decision is made, improving handover success rate without adding delay during the actual handover execution.
Solution Approach 2:
The source eNB autonomously analyzes the UE's historical cell re-selection data and movement patterns to self-determine the mobility state, eliminating the need for additional UE measurements or reporting. This self-service approach provides reliable mobility state information without imposing extra time burden on the handover process.
3Measurement precision
If the source eNB sends detailed UE historical information to the target eNB, then the target eNB can accurately determine mobility state, but the signaling overhead and message size increase
Solution Approach 1:
The source eNB extracts only the essential mobility state information from the comprehensive UE historical data, separating the critical determination result from the detailed historical records. This extraction approach allows the target eNB to receive sufficient information for accurate mobility state determination while minimizing the message size by transmitting only the processed result rather than raw historical data.
Solution Approach 2:
The source eNB acts as an intermediary that processes the UE historical information and transmits only the essential mobility state determination result to the target eNB, rather than forwarding all detailed historical data. This intermediary processing reduces signaling overhead while ensuring the target eNB receives sufficient information for accurate mobility state assessment.
Data Source
AI summary
A method for transmitting a mobility state is provided in the present invention, the method includes: when an source evolved NodeB (eNB) performs a handover of a user equipment (UE) in a connectivity state, it sends the UE historical information to a target eNB; the target eNB decides a mobility state of the UE according to the UE historical information. Alternatively, when the source eNB performs a handover of the UE in a connectivity state, it decides the mobility state of the UE according to the UE historical information, sets the corresponding mobility state instruction information and sends it to the target eNB; the target eNB acquires the mobility state corresponding to the UE according to the received mobility state instruction information. A system for transmitting a mobility state is also provided in the present invention.