Wireless Terminal Measurement Restriction for Distant Cell Signal Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless telecommunications systems face challenges in accurately detecting cell-specific reference signals from distant base stations, which are unreliable for non-mobile assisted handover functionalities like location estimation due to high interference levels.
Innovation Solution
The system configures base stations to transmit positioning reference signals during positioning subframe intervals, while also transmitting cell-specific reference signals continuously, and imposes a measurement restriction on wireless terminals to measure cell-specific signals only during these intervals, leveraging the improved interference characteristics of positioning reference signals to enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell-specific reference signals are transmitted continuously by base stations, then the signals are always available for measurement, but the measurement accuracy deteriorates due to high interference levels from distant cells
Solution Approach 1:
The patent implements periodic transmission of positioning reference signals during specific positioning subframe intervals, rather than continuous transmission. This periodic action creates designated measurement opportunities where interference is reduced, allowing wireless terminals to accurately detect signals from distant base stations while maintaining overall signal availability through regular periodic occurrences
Solution Approach 2:
The patent segments the transmission timeline into regular subframes and designated positioning subframes. By dividing the continuous transmission into discrete intervals with specific purposes (regular communication vs. positioning measurement), the system enables targeted measurements during positioning subframes when interference characteristics are more favorable, while maintaining continuous service during other subframes
2Area of stationary object
If wireless terminals measure cell-specific reference signals from distant base stations, then location estimation coverage is improved, but measurement reliability deteriorates due to interference
Solution Approach 1:
By implementing periodic positioning subframes at regular intervals, the patent enables wireless terminals to periodically attempt measurements of distant base stations. This periodic opportunity structure allows terminals to accumulate measurement data from multiple positioning subframes, improving coverage area while maintaining reliability through repeated measurement attempts under favorable interference conditions
Solution Approach 2:
The patent configures positioning reference signal transmission in advance during designated positioning subframes, allowing wireless terminals to know beforehand when measurement opportunities will occur. This preliminary configuration enables terminals to prepare for measurements of distant cells at specific times when interference is reduced, expanding reliable coverage area without compromising measurement reliability
Data Source
AI summary
A telecommunications system is disclosed comprising a wireless switching center and plurality of base stations that are configured to transmit positioning reference signals. The base stations transmit the positioning reference signals in positioning subframe time intervals. Meanwhile, the base stations also transmit cell-specific reference signals continuously, including during the positioning subframe time intervals. In order to ensure that the wireless terminal measures those cell-specific reference signals during periods of lower interference, the base station imposes a measurement restriction on the wireless terminal, in regard to when it may measure a signal. As a result of utilizing the measurement restriction in this way, in combination with the improved interference characteristics of the positioning reference signals themselves, the ability of the wireless terminal to detect the cell-specific reference signals of more distant cells is improved. The improved signal measurements are then made available to functionalities such as location estimation.