Location Tracking in Mobile Networks via RAN-CN Synthesis
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Solution Overview
Problem
Current 4G mobile communication networks face challenges in efficiently tracking device locations across multiple radio access technologies (RATs) due to limited support for location tracking, high energy consumption, and increased signaling requirements, especially in future networks with diverse device types and high device densities.
Innovation Solution
A location management function apparatus and method that allows for three selectable tracking modes: RAN-assisted parallel local tracking, RAN-assisted complemented local tracking, and CN-independent local tracking, enabling concurrent or exclusive tracking by the core network and radio access network, reducing signaling and energy consumption by optimizing location reporting and tracking policies based on device characteristics and network capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CN-level location tracking using TAU procedure is used, then location tracking is achieved, but energy consumption and radio resource usage increase
Solution Approach 1:
The patent segments location tracking into two independent components: RAN-level tracking (performed by the radio access network using radio resource control beacons) and CN-level tracking (performed by the core network using TAU procedures). This segmentation allows the system to use RAN-level tracking for continuous location monitoring, reducing the frequency and intensity of CN-level tracking operations, thereby lowering UE energy consumption while maintaining reliable location tracking.
Solution Approach 2:
The patent introduces RAN-level tracking as an intermediary mechanism between the UE and the CN. Instead of direct CN-level tracking requiring full TAU procedures, the RAN acts as an intermediary that performs preliminary location tracking using beacons and reports to the CN only when necessary. This intermediary approach reduces the burden on UEs and optimizes energy consumption.
2Loss of energy
If RAN-level location tracking is implemented, then signaling overhead is reduced, but support across multiple RATs is limited
Solution Approach 1:
The patent implements a universal location tracking framework where the RAN-level tracking mechanism using RRC beacons is designed to be RAT-agnostic. The same RAN-level tracking approach can be applied across different radio access technologies (4G, 5G, Wi-Fi, etc.), providing multi-functionality and broad adaptability. The CN coordinates tracking policies across multiple RATs, ensuring consistent location tracking regardless of the specific RAT being used.
Solution Approach 2:
The patent employs dynamic tracking policies that can adapt to different RAT characteristics. The CN configures RAN-level tracking parameters dynamically based on the specific RAT being used, device capabilities, and network conditions. This dynamic approach allows the system to optimize tracking performance for each RAT while maintaining a unified location tracking framework.
3Ease of operation
If location tracking is performed in IDLE state, then device mobility is supported, but radio resources are consumed
Solution Approach 1:
The patent applies partial action by having the RAN perform location tracking using lightweight RRC beacons instead of full TAU procedures. This partial tracking approach provides sufficient location information for mobile devices in IDLE state without consuming excessive radio resources. The CN only initiates full TAU procedures when absolutely necessary, using RAN-level tracking for routine location updates.
Data Source
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AI summary
A communications system comprising a core network, a radio access network and at least one user equipment device, wherein: the core network is configured for communicating with the user equipment device to form a first estimate of the location of the user equipment device; the radio access network is configured for communicating with the user equipment device to form a second estimate of the location of the user equipment device; and the core network is configured for forming a third estimate of the location of the user equipment device by synthesising the first and second estimates.