Network Sharing Handover via Source Identification for SRVCC
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Solution Overview
Problem
Current network sharing technologies lack defined behavior for handover from the circuit switched (CS) domain to LTE, leading to potential call failures and unnecessary roaming charges due to incorrect target network selection during single radio voice call continuity (SRVCC) procedures.
Innovation Solution
The method involves requesting handover of user equipment from a source network to a target network, providing or determining network identification to ensure seamless handover, particularly by passing the source network identification during packet-switched to circuit-switched or circuit-switched to circuit-switched handovers, thereby optimizing target network selection and avoiding call failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If network sharing is implemented without defined handover behavior from CS to LTE, then network flexibility and resource utilization are improved, but call continuity reliability deteriorates due to incorrect target network selection
Solution Approach 1:
The source network identification is determined and stored before the handover process begins. This preliminary action ensures that when handover is needed, the correct target network can be selected without delay or error, resolving the contradiction by preparing necessary information in advance that guarantees both network flexibility and call continuity reliability
Solution Approach 2:
The source network identification acts as an intermediary element that bridges the CS and LTE domains during handover. By passing this identification information between networks, the system enables correct target selection in the LTE network based on the original CS network context, ensuring reliable call continuity while maintaining network sharing flexibility
2Ease of operation
If handover procedures lack source network identification, then procedure simplicity is maintained, but target network selection accuracy deteriorates leading to call failures
Solution Approach 1:
The source network identification is determined and stored in advance during the initial CS call setup or previous handover. This preliminary determination eliminates the need for complex real-time identification processes during handover, maintaining procedural simplicity while ensuring accurate target network selection through the pre-captured identification information
Solution Approach 2:
The source network identification is copied and transmitted from the source network to the target network during handover. This copying mechanism preserves the essential identification information needed for accurate target selection without requiring complex real-time analysis, thus maintaining procedural simplicity while improving selection accuracy
3Adaptability or versatility
If incorrect target network is selected during handover, then network sharing capability is utilized, but unnecessary roaming charges occur and call reliability decreases
Solution Approach 1:
The source network identification provides feedback information to the target network, enabling it to make informed decisions about handover acceptance and target network selection. This feedback mechanism ensures that network sharing is utilized appropriately while preventing incorrect selections that would lead to roaming charges and call failures, thus maintaining both adaptability and reliability
Data Source
AI summary
Certain networks can operate using circuit switched infrastructure, while other networks may operate using infrastructure for the long term evolution (LTE) of the third generation partnership project (3GPP). Devices can operate across the boundaries of these networks. Thus, such devices as well as the networks may benefit from network sharing in reverse single radio voice call continuity. For example, a method may include requesting handover of a user equipment from a source network to a target network. The method may also include providing a network identification corresponding to the source network while requesting the handover. Alternatively, or in addition, a method may include requesting handover of a user equipment from a source network to a target network. The method may also include determining the target network based on a network identification received previously.