Network Access Apparatus IMS Voice Switching
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Solution Overview
Problem
User equipment (UE) fails to establish a voice service in an LTE network due to underlying chip support for IMS voice but lack of upper-layer service support, leading to unavailability of voice services when VoLTE technology is not deployed and CSFB is not supported.
Innovation Solution
A network access method and apparatus that determine a ready-to-switch-network user equipment based on IMS function support status and communication configuration parameters, sending a network switch indication to instruct the UE to access a voice service access network, such as a GERAN/UTRAN network, to ensure voice service availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continues to camp on the LTE network and prepares to implement VoLTE technology, then the UE can maintain network connectivity, but the UE cannot establish a voice bearer channel because the upper-layer service does not support IMS voice
Solution Approach 1:
The network side performs preliminary detection to identify UEs that are ready to switch networks based on their capability to establish IMS bearers. This preliminary identification allows the network to proactively manage network switching before voice service failures occur, resolving the contradiction by preventing the UE from remaining on an incompatible network configuration.
Solution Approach 2:
The network side sends network switching indications to identified UEs, creating a feedback loop that guides the UE to switch from LTE to GERAN/UTRAN networks. This feedback mechanism ensures that UEs with unsupported upper-layer services are redirected to appropriate networks, maintaining voice service availability while managing network access complexity.
2Loss of information
If the network side prompts the terminal that the network side supports the VoLTE technology, then the terminal receives accurate network capability information, but the terminal does not reselect a GERAN/UTRAN network because the underlying chip supports IMS voice
Solution Approach 1:
The network switching indication dynamically adjusts the UE's network selection behavior based on real-time assessment of the UE's actual capability to establish IMS bearers. This dynamic approach allows the network to override the UE's default preference for LTE network when the UE's upper-layer service cannot support IMS voice, resolving the contradiction between providing accurate network capability information and enabling appropriate network reselection adaptability.
3Measurement precision
If the UE cannot establish an IMS bearer in a preset period, then the network can identify the UE as having issues, but the UE remains stuck on the LTE network without proper voice service
Solution Approach 1:
The network side performs preliminary detection within a preset period to identify UEs that cannot establish IMS bearers. This preliminary action allows the network to proactively identify problematic UEs before they experience voice service failures, and immediately initiate network switching procedures, thereby resolving the contradiction by both precisely detecting UE capability issues and minimizing the time loss through immediate corrective action.
Data Source
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AI summary
The present invention relates to the field of wireless communications technologies, and discloses a network access method and apparatus, which are used to resolve a problem that a UE cannot use a voice service in an LTE network. The apparatus includes: a processor, configured to: when registration in a circuit switched domain fails, determine a ready-to-switch-network user equipment according to an IMS function support status of a user equipment UE, where the IMS function support status is used to indicate whether the user equipment supports IMS voice; and determine a target user equipment according to a communication configuration parameter of the ready-to-switch-network user equipment, where the communication configuration parameter is used to indicate a preferred service type of the ready-to-switch-network user equipment; and a transmitter, configured to send a network switch indication carrying a preset cause value to the target user equipment determined by the processor, where the network switch indication is used to instruct the target user equipment to access a voice service access network. The present invention is mainly applied to a mobile terminal access process.