Presence Database for Dual-Mode Call Cost Reduction
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Solution Overview
Problem
Users of dual-mode mobile terminals face challenges in seamlessly switching between cellular and wireless data network calls, often resulting in higher costs due to unawareness of dynamically assigned IP addresses or SIP URIs, leading to forced usage of expensive cellular calls instead of cost-effective VoIP calls.
Innovation Solution
A method is introduced where a dual-mode mobile terminal determines the second-mode identity of a called party by querying a database or presence service, allowing it to initiate a data network call using the obtained IP address or SIP URI, thereby facilitating a switch from a first-mode to a second-mode communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual-mode mobile terminal uses cellular network for calls, then call connectivity is ensured, but communication cost increases
Solution Approach 1:
The system performs preliminary actions by pre-establishing presence information databases that map cellular identifiers to VoIP identifiers before calls are needed. When a call is initiated, the system queries this pre-built database to determine the appropriate calling method, avoiding the need for real-time configuration decisions and enabling automatic selection of cost-effective VoIP calls when available.
Solution Approach 2:
The patent introduces an intermediary presence information database that acts as a mediator between the cellular network and VoIP network. This database stores mappings between cellular identifiers (MSISDN) and VoIP identifiers (SIP URI), allowing the mobile terminal to automatically translate call requests into the appropriate network protocol and route, thereby resolving the contradiction between ensuring call connectivity and minimizing communication costs.
2Loss of energy
If a dual-mode mobile terminal automatically switches to data network mode, then communication cost decreases, but system complexity increases
Solution Approach 1:
The mobile terminal performs self-service by automatically querying the presence information database to determine the optimal calling method without user intervention. The system independently resolves identifier mappings, selects between cellular and VoIP modes, and configures call parameters, thereby reducing the complexity burden on the user while achieving cost savings through automated intelligent decision-making.
Solution Approach 2:
The patent replaces manual mechanical configuration with automated electronic database querying and identifier translation. Instead of requiring users to manually configure mode switching or the system to perform complex real-time analysis, a pre-built presence information database provides instant lookup of mapping relationships, simplifying the automated decision-making process and reducing system complexity.
3Loss of energy
If the terminal queries presence information to determine second-mode identity, then call cost is reduced, but time consumption increases
Solution Approach 1:
The system performs preliminary action by pre-populating the presence information database with identifier mappings before calls are needed. This allows the database to provide instant lookup results during call setup, eliminating the need for real-time network queries or complex analysis, thereby reducing call setup time while maintaining cost savings through automated mode selection.
Data Source
AI summary
To facilitate establishment of connections between dual-mode mobile wireless devices within a local wireless data network, at a network gateway for the local wireless data network, receiving from a first dual-mode mobile wireless device following entry of the first dual-mode mobile wireless device to the local wireless data network a registration request, a first dual-mode mobile wireless device telephone directory number (DN), and a first dual-mode mobile wireless device session initiation protocol (SIP) uniform resource identifier (URI). A first device dynamic data network address is assigned to the first dual-mode mobile wireless device. The first device DN and the first device SIP URI are forwarded to a database for storage no that the first device SIP URI is associated with the first device DN in the database. The first dual-mode mobile wireless device is returned a network SIP URI for the wireless data network.