Apple Inc. (Cupertino, CA)

The call setup time can be improved with an apparatus, system or method. This method is performed using a device which establishes both first and second network connections. The second network manages voice calls that are circuit switched. The method involves receiving a call input to initiate a call. The method also determines if the device is equipped with a first feature that allows the call by using Internet Protocol (IP). If the device has been registered with the first feature, the method includes determining whether the timeouts to attempt previously attempted IP calls is greater than an acceptable threshold. If timeouts exceed the threshold, the method involves deregistering from the feature and then performing a circuit switching fallback (CSFB), procedure which involves a handover from the original network to a second network. This method allows for a circuit switched call to be executed.

A user equipment (UE) may be configured to establish a connection to at most one of networks or types of networks, as well as connecting to other UEs to carry out a range of different functionalities via the connection. As an example one example, the UE could connect to a first type of network (e.g. an long Term Evolution (LTE) network) to be able to communicate with a different UE via the network connection (e.g. the user of the UE can make a voice call or transmit an SMS to a user of another UE). To establish a connection with the additional UE, the UE may utilize a plurality of different calling apps. The calling application could make use of the circuit switched call or voice over Internet Protocol (IP), or voice over LTE (VoLTE) to establish a communication pathway to the other UE.

VoLTE calls can bring many benefits for both the service that is making the calls as well as the user who is making calls. For instance the VoLTE call can permit more data and/or voice to be sent within a certain time. Another example is that VoLTE calls could use less bandwidth than other VoIP calls. Another example is that the VoLTE call doesn’t depend on the legacy switched voice network. It is possible to use an IP Multimedia Subsystem (IMS), may be used to complete a VoLTE Call. If the IMS is not able to establish the call, the protocol utilized by UE is to register with IMS and use a fallback procedure to allow the call to be established using the circuit switched voice network (e.g. an a circuit-switched fallback process(CSFB). This can take a considerable amount of time and could alter the user’s experience. If the UE is in an location in which the IMS cannot establish connections (e.g. an unloaded IMS), the user could experience long setup time.

The examples are directed to an improvement in call setup time. The method is executed on an apparatus that is equipped to establish a primary network connection to a first network, and a second connection to a secondary network The second network is set up to conduct circuit switched voice calls. The method is based on receiving a call input in order to make a call. The method includes determining whether the device has been registered with an initial feature of the first network.The first feature is set to perform calls based on Internet Protocol (IP). The method determines if the number of timeouts permitted for calls that have been made previously based on the IP exceeds a threshold in the event that the device has been registered with the first feature. The method involves being removed from the first feature when the timeouts count exceeds the threshold. This procedure involves executing the circuit switched failback (CSFB), procedure which involves a handover between networks. This technique involves making the call as circuit switched calls.

The examples are directed to the creation of a device that reduces call’s setup time. The device consists of a transceiver as well as processor. The transceiver is configured to create a first network connection to a primary network and a secondnetwork connection to another network. The second network is designed to perform circuit switched voice calls. A call input is processed by the processor to make calls. The processor determines whether the device has been registered with a first feature ofthe first network. First, the feature is configured to allow calls via the Internet Protocol (IP). The processor reviews the device’s registration with the first feature in order to determine if number of timeouts permitted for calls previously made based on the IP exceeds a threshold. When the number of timeouts exceeds the threshold, the device removes it with the feature. The processor executes circuit switch fallback (CSFB), which includes transfer of the first network to the second. The call is handled by the processor in the form of the result of a circuit switch.

These exemplary embodiments address the issue of reducing call setup time. This method is carried out on a device that is able to create a first connection to a network that is a first one, and an additional connection to a second network, with the second network is used to conduct circuit switched voice calls. The method involves receiving an input from a call to perform calls. The method involves determining if the device has been registered to a first feature of the initial network, the primary feature configured to perform the call using an Internet Protocol (IP). The method determines whether the amount of timeouts permitted for calls that have been made previously based on the IP exceeds an amount that is acceptable when the device has been registered with the first feature. If the number of timeouts are greater than the threshold, the method is to remove the feature from registration and setting the delay timer. The delay timer blocks the device from being registered to the initial feature. This method includes the circuit switched failback (CSFB) method that involves a handover of the first network to its second network. The method also involves performing the call as an CSFB call. Once the call is circuit switched has been completed, the method involves connecting to the first networks. The method also checks whether the delay timer is in operation. The method prevents the device from registering with first feature when the delay timer is activated.

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