Wireless Device ICS Operation Adaptation
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Solution Overview
Problem
Existing radio communication systems face challenges in operating IMS Centralized Services (ICS) and Dual Transfer Mode (DTM) capable wireless devices, particularly when the network is not DTM capable, leading to issues with call setup and supplementary service control, as well as the lack of defined protocols for mid-session services when packet access is lost.
Innovation Solution
A method and apparatus that enable a wireless device to detect network capabilities, adjust communication operations based on DTM availability, and provide indications to the network about its capabilities, using traditional 3GPP signaling or USSD tunneling when DTM is not available, ensuring seamless service operation by registering with the IMS home network and routing calls appropriately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the wireless device registers with the IMS home network to access services like PoC, OMA, and SIMPLE, then service availability is improved, but the network cannot detect that the device is in a non-DTM capable area, causing call operations to fail
Solution Approach 1:
The wireless device provides feedback to the network by including an indication in registration messages that it is in a non-DTM capable area. This feedback mechanism allows the network to adapt its service provisioning and routing decisions, preventing call operation failures while maintaining service availability.
Solution Approach 2:
The wireless device performs preliminary detection of DTM capability status before registering with the IMS home network. By detecting the non-DTM capable status in advance and communicating this to the network during registration, the system prevents future call operation failures rather than reacting to them after they occur.
2Adaptability or versatility
If the wireless device uses traditional 3GPP signaling or USSD tunneling when DTM is not available, then compatibility with non-DTM networks is improved, but mid-call supplementary service operations cannot be performed
Solution Approach 1:
The patent introduces an intermediary indication mechanism that communicates the device's capability status to the network. This intermediary information allows the network to mediate service provisioning, enabling supplementary services to be properly managed even when the device is operating in a non-DTM environment using traditional signaling methods.
3Reliability
If the wireless device loses packet access needed to control IMS centralized services, then basic circuit-switched communication is maintained, but no protocol is defined for mid-session services
Solution Approach 1:
The wireless device autonomously detects the loss of packet access and determines its capability status. It then provides self-generated indications to the network about its operational state, enabling the network to continue providing basic circuit-switched services while adapting to the device's reduced capability state without requiring complex additional protocols.
Data Source
AI summary
An apparatus, and an associated method, for facilitating communication operations with a wireless device that is ICS or DTM capable. Signaling protocols and apparatus are provided for operation of the wireless device when an ICS with the wireless device is ongoing, and the device leaves an area that provides for ICS as well as when the ICS can be provided using circuit-switched connections.