UE Mobility Report Editing for LTE Handover Optimization
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Solution Overview
Problem
In wireless communication networks, particularly in LTE-A, user equipment (UE) mobility information is often incomplete due to limitations in logging and editing cell reselection data, leading to suboptimal handover processes and inefficient resource allocation, especially in cases of ping-pong handovers and high mobility scenarios.
Innovation Solution
The UE is configured to log and edit mobility information by removing duplicate cell reselections and those with low Time of Stay (ToS) durations, and identifying and editing ping-pong handover sequences, thereby optimizing the mobility report sent to the E-UTRAN, ensuring more accurate mobility information is transmitted during transitions from RRC_IDLE to RRC_CONNECTED states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE logs all cell reselections in the mobility report, then the completeness of mobility information is improved, but the size of the mobility report increases and processing complexity increases
Solution Approach 1:
The patent extracts and removes unnecessary entries from the mobility report by identifying and eliminating duplicate cell reselections and ping-pong handover sequences. This extraction process maintains the essential mobility information while reducing the overall report size and processing complexity, directly resolving the contradiction between information completeness and processing complexity.
Solution Approach 2:
The patent performs preliminary processing of the mobility report before transmission by pre-identifying and removing duplicate entries and ping-pong sequences. This preliminary action reduces the data volume and processing requirements downstream, allowing the system to maintain information completeness while reducing complexity through advance data preparation.
2Measurement precision
If the UE includes all cell reselection data in the mobility report, then the accuracy of handover optimization is improved, but the transmission overhead increases
Solution Approach 1:
The patent extracts and removes redundant data elements (duplicate cell reselections and ping-pong handover sequences) from the mobility report. This extraction maintains the accuracy needed for handover optimization by preserving only the essential mobility information, thereby reducing transmission overhead while preserving measurement precision.
Solution Approach 2:
The patent discards redundant and unnecessary mobility report entries (duplicates and ping-pong sequences) while recovering and preserving the critical handover optimization information. This selective discarding reduces transmission overhead without compromising the accuracy required for effective handover decisions.
3Productivity
If the UE processes and edits mobility information locally, then the efficiency of resource allocation is improved, but the device complexity increases
Solution Approach 1:
The patent implements self-service by having the UE autonomously process, edit, and optimize its own mobility report without requiring extensive external intervention. The UE automatically identifies and removes duplicate entries and ping-pong sequences, enabling efficient resource allocation while the complexity is managed through standardized algorithms embedded in the device.
Solution Approach 2:
The patent performs preliminary processing of mobility information locally before transmission to the network. This preliminary action includes automatically identifying and removing redundant entries, which improves the efficiency of subsequent resource allocation while the processing complexity is contained within standardized pre-processing routines.
Data Source
AI summary
Disclosed herein are apparatuses, systems, and methods for creating and editing user equipment (UE) mobility information. During a radio resource control idle (RRC_IDLE) state, a plurality of cell reselections are logged into a mobility report, and each logged cell reselection includes a cell identification (Cell ID) and a Time of Stay (ToS) duration. The mobility report is edited to remove one or more logged cell reselections based, at least in part, on identifying logged cell reselections having duplicate Cell IDs and/or identifying logged cell reselections having a ToS duration lower than a threshold value. The edited mobility report is transmitted to an evolved Universal Terrestrial Radio Access Network (E-UTRAN) in response to the UE transitioning from the RRC_IDLE state to a radio resource control connected (RRC_CONNECTED) state.