Mobile Terminal Positioning Method Selection
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Solution Overview
Problem
The existing location systems, such as those standardized by 3GPP, face significant processing burdens and resource wastage due to complex method selection processes and lack of consideration for environmental factors like GPS satellite observability, leading to inefficient positioning method choices, especially in environments where GPS signals are unavailable.
Innovation Solution
A location system and method where a mobile terminal with multiple location processors and wireless nodes selects a positioning method based on requested accuracy and capability information, allowing it to operate the appropriate processor for measurement data production, with a controlling node facilitating this selection through control messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the RNC selects positioning methods based on requested accuracy, then positioning accuracy is improved, but processing burden and network resource consumption increase
Solution Approach 1:
The patent extracts the positioning method selection function from the RNC and relocates it to the mobile terminal. The RNC only transmits the client's requested accuracy to the terminal, while the terminal independently selects the appropriate positioning method based on its capabilities and environmental conditions, significantly reducing the RNC's processing burden.
Solution Approach 2:
The mobile terminal performs self-service by autonomously selecting the positioning method that best suits its current situation. The terminal evaluates its own capability information and environmental factors (such as GPS satellite observability) to make the selection, eliminating the need for complex network-side decision-making.
2Measurement precision
If A-GPS is selected based on requested accuracy without considering environment, then positioning accuracy is improved, but network resources are wasted in GPS-unobservable environments
Solution Approach 1:
The patent applies local quality by making the positioning method selection adaptive to the terminal's local environmental conditions. The terminal considers factors such as GPS satellite observability in its specific location (e.g., underground shopping areas) and selects positioning methods appropriate for that local context, avoiding unnecessary A-GPS attempts in GPS-denied environments.
Solution Approach 2:
The terminal performs preliminary assessment of its capability information and environmental conditions before selecting a positioning method. By evaluating whether GPS satellites are observable and what positioning capabilities are available beforehand, the terminal avoids initiating positioning procedures that would fail and waste network resources.
3Adaptability or versatility
If multiple positioning methods are supported, then positioning adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamics by making the positioning method selection flexible and adaptive rather than fixed. The terminal dynamically evaluates its capability information and environmental conditions to select the most appropriate positioning method, allowing the system to adapt to changing conditions without requiring complex manual configuration.
Data Source
AI summary
In a mobile communication network, a controlling node receives capability information from a mobile terminal, indicating positioning methods supported by the mobile terminal and selectability of the positioning methods. In response to a location request message from a client terminal requesting the location information of a target mobile terminal, the controlling node transmits a first control message via a wireless node to the target mobile terminal, containing a copy of requested accuracy of the location information, if the capability information indicates that the target mobile terminal is capable of selecting positioning methods. The mobile terminal performs measurement according to a positioning method that satisfies the requested accuracy. Otherwise, the controlling transmits a second control message to the mobile terminal, specifying a positioning method. In this case, the mobile terminal performs measurement according to the specified positioning method.