Visited Cell History Logging for UE Speed Estimation
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Solution Overview
Problem
In LTE/LTE-A networks, there is a lack of solutions for the network to estimate the speed of user equipment (UE) as it moves through multiple cells, necessitating a method to accumulate and provide visited cell history to facilitate speed estimation.
Innovation Solution
The UE logs visited cell history, including identifiers and time information, and transmits this data to the network during RRC connection setup, with validity checks to ensure only relevant information is shared, allowing the network to estimate the UE's speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the network requests detailed visited cell history information from the UE, then the accuracy of speed estimation is improved, but the signaling overhead and network resource consumption increase
Solution Approach 1:
The patent extracts only the necessary visited cell history information (cell identifiers and time information) that is relevant for speed estimation, rather than transmitting all possible UE data. This selective extraction reduces signaling overhead while maintaining the accuracy needed for speed estimation.
Solution Approach 2:
The patent implements a balanced approach where the network requests a specific amount of visited cell history data - enough to accurately estimate UE speed but not so much as to create excessive signaling overhead. The network can control the extent of information requested based on its specific needs.
2Measurement precision
If the UE transmits complete visited cell history information, then the network can accurately estimate UE speed, but the UE's power consumption and processing burden increase
Solution Approach 1:
The UE extracts and transmits only the essential visited cell history elements (cell IDs and time information) required for speed estimation, avoiding the transmission of redundant data. This reduces the processing burden and power consumption while maintaining sufficient accuracy for the network's speed estimation needs.
Solution Approach 2:
The UE transmits a partial set of visited cell history information that is sufficient for speed estimation purposes. The UE does not transmit complete historical data but rather a curated subset that provides the necessary accuracy for network calculations.
3Measurement precision
If the network stores and processes extensive visited cell history data, then more accurate speed estimation can be achieved, but the network device complexity and storage requirements increase
Solution Approach 1:
The network extracts and processes only the critical elements of visited cell history data (cell identifiers and time information) needed for speed estimation. By focusing on these essential parameters rather than processing all possible UE data, the network reduces computational complexity and storage requirements while maintaining accurate speed estimation capability.
Data Source
AI summary
There is provided a method for transmitting an uplink message, the method performed by a user equipment (UE). The method may comprise: receiving, by the UE, a request about a visited cell history; transmitting, by the UE, in response to the request, the visited cell history. Here, the cell visited history may include an identifier of a visited cell, and time information corresponding to the visited cell.