Shared Cell Positioning via Transmission Point Identification
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Solution Overview
Problem
In wireless communication systems, positioning measurements in shared cells are inaccurate due to transmission points sharing the same cell identity, making it difficult to distinguish between signals from different transmission points, leading to large positioning errors based on cell identity alone.
Innovation Solution
The method involves obtaining and comparing results of additional radio measurements to determine the specific transmission point that transmitted the signal for positioning measurements, associating this information with the target device's identity and using it to improve positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple transmission points share the same cell identity in a shared cell, then coverage of synchronization and control channels is improved through signal combining, but positioning measurement accuracy deteriorates because signals from different transmission points cannot be distinguished
Solution Approach 1:
The patent segments the positioning measurement process by introducing additional measurement types (uplink timing measurements, downlink signal strength measurements) that can individually identify which transmission point transmitted the signal. This segmentation allows the system to separate the identification function from the positioning function, resolving the contradiction between signal combining and signal distinction.
Solution Approach 2:
The patent uses additional radio measurements as intermediary indicators to identify the transmitting transmission point. These intermediary measurements (such as uplink timing measurements or downlink signal strength measurements) serve as mediators that bridge the gap between the shared cell identity and the specific transmission point, enabling accurate positioning without requiring unique cell identities for each transmission point.
2Device complexity
If conventional positioning methods use only cell identity to identify transmission points, then device complexity is reduced, but positioning accuracy deteriorates due to inability to distinguish between multiple transmission points
Solution Approach 1:
The patent makes existing radio measurement mechanisms multi-functional by using them for both traditional radio resource management purposes and for transmission point identification in positioning scenarios. For example, uplink timing measurements and downlink signal strength measurements serve dual purposes: resource management and transmission point identification. This universality avoids adding complex new identification mechanisms while improving positioning accuracy.
Solution Approach 2:
The patent changes the parameters used for transmission point identification from relying solely on cell identity to incorporating additional measurement parameters such as timing measurements and signal strength measurements. By changing the identification parameters, the system can distinguish between transmission points sharing the same cell identity without significantly increasing device complexity.
Data Source
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AI summary
A method is implemented by a node in a wireless communication system (10). The method includes obtaining (110) the results of one or more first radio measurements performed on one or more first radio signals transmitted or received by geographically separated transmission points, TPs, (20) of a shared cell. The method also includes determining (120), using the obtained results and from among the TPs (20) that transmit second radio signals based on the same cell identity, the particular TP (20) that transmits the second radio signal on which a positioning measurement is performed for determining a target wireless communication device's position. The method finally entails using (130) information related to the determined TP (20) to perform one or more positioning tasks.