SRVCC Service Enablement Based on Access Network Coverage
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Solution Overview
Problem
Current telecommunications networks waste resources by maintaining state data for Single-Radio Voice Call Continuity (SRVCC) on terminals that cannot participate in SRVCC handovers due to lack of CS coverage, reducing network capacity and efficiency.
Innovation Solution
Implementing a system that determines terminal location and service availability, enabling or disabling SRVCC per-terminal or per-registration, allowing SRVCC only when supported, thereby reducing unnecessary resource reservations and network load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SRVCC service is maintained for all terminals, then service coverage is improved, but network resource waste increases due to state data maintenance for terminals without CS coverage
Solution Approach 1:
The patent applies local quality by determining service availability based on terminal location and access network type. SRVCC service is enabled only for terminals connected to PS networks with CS coverage availability, while terminals on LTE-only networks or without CS coverage have SRVCC disabled. This location-based service differentiation eliminates unnecessary state data maintenance for terminals that cannot perform SRVCC handovers, resolving the contradiction between broad service coverage and network resource efficiency
2Reliability
If SRVCC state data is maintained on all terminals, then service availability is improved, but network capacity is reduced due to increased load
Solution Approach 1:
The patent implements preliminary action by determining SRVCC service availability before establishing communication sessions. The network assesses terminal location, access network type, and CS coverage availability in advance, enabling SRVCC only for eligible terminals. This pre-screening mechanism ensures that SRVCC state data is maintained only when necessary, preserving network capacity while ensuring service availability for terminals that can actually utilize SRVCC handovers
Data Source
AI summary
In some examples, an anchoring network system (e.g., PCSCF) of a telecommunications network can receive first data requesting a network service (e.g., eSRVCC) from a network terminal (e.g., UE). The anchoring system can determine that the network service is not supported in an access network to which the terminal is connected. The anchoring system can determine second data that does not request the predetermined network service, and transmit the second data to a core network system (e.g., SCSCF). In some examples, an application server can retrieve location information (e.g., LAC) of the terminal and determine that the service is not supported based on the location information. In some examples, an anchoring network system can remove a network-service system (e.g., ATCF or SCCAS) from a signaling chain associated with the terminal. In some examples, the terminal can determine whether SRVCC is supported based on an attach result.