OTDOA Cell Search List Comparison for Positioning Efficiency
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in positioning measurements due to mobile devices needing to search a large list of cells for observed time difference of arrival (OTDOA) observations, leading to increased power consumption, computation load, and time wastage.
Innovation Solution
A method and apparatus that compare the received search list of cells to a stored list, adjusting search ranges based on the comparison results, allowing for targeted OTDOA measurements by detecting positioning reference signals from selected cells, thereby reducing the need to search all cells in the list.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE blindly searches all cells in the search list to perform OTDOA measurements, then positioning measurement coverage is ensured, but power consumption and computation load increase significantly
Solution Approach 1:
The patent applies preliminary action by having the network pre-provide the UE with a search list of cells that are likely to be relevant for OTDOA measurements. This pre-filtering action reduces the number of cells the UE needs to search, thereby reducing power consumption while maintaining positioning coverage. The search list is prepared in advance by the network based on knowledge of cell locations and UE position, eliminating the need for the UE to perform exhaustive blind searches.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network acts as a mediator between the UE and the full cell list. The network provides a filtered search list that intermediates between the complete network cell inventory and the UE's measurement capabilities. This intermediary layer reduces the information processing burden on the UE while ensuring the UE receives appropriate cells for positioning measurements.
2Reliability
If the UE blindly searches all cells in the search list to perform OTDOA measurements, then positioning measurement coverage is ensured, but computation load and process load increase significantly
Solution Approach 1:
The network performs preliminary filtering of cells before providing the search list to the UE. This pre-computation action reduces the number of cells the UE needs to process, thereby reducing computation load and process load on the UE device while maintaining comprehensive positioning coverage through careful selection of relevant cells.
3Reliability
If the UE blindly searches all cells in the search list, then complete positioning data is collected, but time consumption increases
Solution Approach 1:
The network performs preliminary action by pre-compiling a search list of cells that are most relevant for the UE's positioning needs. This pre-filtering based on network knowledge of cell locations, UE position, and measurement requirements significantly reduces the time the UE needs to spend searching for positioning reference signals while ensuring that complete and accurate positioning data is collected from the most relevant cells.
Data Source
AI summary
A method for enhancing positioning measurement and a communications apparatus are disclosed. The method includes receiving an observed mobility difference of arrival (OTDOA) request and a search list of cells provided by a network at a second time point, comparing the received search list to a stored search list of cells which is received from the network at a first time point and stored in a database, searching at least one of the cells from the received search list by using different search ranges adjusted according to the comparison result, and storing the at least one of the cells in the database, and performing OTDOA measurements from the at least one of the cells. The corresponding communications apparatus includes a receiving module, a comparing module, a searching module, and a measuring module, configured to carry out the above-identified operations.