Femtocell Location Encoding for VoIP Routing
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Solution Overview
Problem
Current VoIP networks are unable to forward location-sensitive calls made via femtocells, as these devices do not have fixed known locations, preventing accurate routing to appropriate operators based on the caller's geographic location.
Innovation Solution
Femtocells determine their location using sector identifiers and global positioning system (GPS) coordinates, allowing them to provide location information to mobile devices, which can then forward calls to the appropriate operator within the VoIP network based on this data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If femtocells are used as small form factor wireless base stations, then device flexibility and installation adaptability are improved, but location identification capability deteriorates because they do not have fixed known locations
Solution Approach 1:
The system performs preliminary location determination by having the femtocell acquire its location information before the call routing process. The femtocell determines its location using GPS or other location services and stores this information, so that when a call arrives, the location data is already ready for immediate use in routing decisions.
Solution Approach 2:
The patent introduces an intermediary mechanism where the femtocell acts as a mediator between the mobile device and the VoIP network. The femtocell determines its own location and provides this location information to the VoIP network, enabling the network to route calls appropriately without requiring fixed physical infrastructure.
2Measurement precision
If femtocells determine their location dynamically, then location accuracy for call routing is improved, but system complexity increases due to additional location determination mechanisms
Solution Approach 1:
The femtocell performs self-service by autonomously determining its own location using GPS or other location services without requiring external assistance from the VoIP network or mobile device. This self-determination mechanism, while adding some complexity to the femtocell itself, simplifies the overall system architecture by eliminating the need for complex network-based location tracking systems.
3Measurement precision
If location information is provided by femtocell, then call routing accuracy is improved, but information availability requirements increase
Solution Approach 1:
The femtocell determines and stores its location information in advance, ensuring that when a call arrives, the location data is immediately available for routing decisions. This preliminary preparation eliminates information availability issues and ensures consistent routing accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the routing of location-sensitive calls from mobile devices through femtocells to the correct operators, ensuring that calls, such as emergency or directory assistance calls, are handled by the appropriate service providers based on the caller's location, even when using femtocell networks.
Implementation Method 1
Femtocells determine their location using sector identifiers and global positioning system (GPS) coordinates
Data Source
AI summary
A device associated with a Voice over IP (VoIP) network receives a call from a mobile device. The device determines whether a sector identifier (ID) associated with the call includes a femtocell identifier. The device further determines a location identifier included in the sector ID when the sector ID includes the femtocell identifier. The device also identifies a recipient of the call based on the location identifier and forwards the call to the recipient.