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Returning to first network from second network after premature termination of circuit switched fallback voice call

A circuit switching fallback and voice call technology, applied in network topology, electrical components, wireless communication, etc., can solve problems such as low data rate, extended call time period, battery power consumption, etc., achieve fast data rate, reduce battery power The effect of consumption and improvement of user experience

Active Publication Date: 2017-02-22
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lower data rates offered by legacy networks, the extended duration spent camping on legacy networks before returning to the LTE network in the event of premature call termination can adversely affect user experience
Furthermore, the signaling required to create a connection on a legacy network and perform measurements and reselect to an LTE network can consume additional battery power and cause signaling overhead from a network perspective
Additionally, the device may not be pageable during the time period when a connection is created on a legacy network and reselected to an LTE network, and thus may miss paging for an incoming call
As such, first camping on a legacy network and then reselecting to an LTE network in the event of premature call termination may result in an extended period of time in which the wireless device is not pageable and thus may result in additional call failures and missed calls

Method used

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  • Returning to first network from second network after premature termination of circuit switched fallback voice call
  • Returning to first network from second network after premature termination of circuit switched fallback voice call
  • Returning to first network from second network after premature termination of circuit switched fallback voice call

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Embodiment Construction

[0016] Reference will now be made in detail to representative embodiments illustrated in the accompanying drawings. It should be understood that the following description is not intended to limit the embodiments to one preferred embodiment. On the contrary, it is intended to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the described embodiments as defined by the appended claims.

[0017] figure 1 Overlapping coverage of fourth generation (4G) network 102 and legacy network 104 in communication system 400 is shown, according to some example embodiments. The 4G network 102 may be, for example, a network using a 4G RAT, such as an LTE RAT (eg, LTE, LTE-Advanced (LTE-A), and / or other current or future-developed LTE RATs), which may provide better performance than traditional networks such as 2G and 3G. Network faster data rate. However, 4G networks may not support voice calling. It should be understood that the 4G netw...

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Abstract

A method for returning to a first network from a second network after premature termination of a CSFB voice call is provided. The method can include a wireless communication device storing cell information for the first network while connected to the first network; participating in a CSFB procedure to transition to the second network in response to initiation of a voice call; and determining that the voice call has prematurely terminated. In response to premature termination of the voice call, the method can further include performing a scan for a first network cell based on stored cell information for up to a maximum scan time period; reselecting to a first network cell in an instance in which a first network cell is identified by the scan; and camping on the second network in an instance in which a first network cell is not identified by the scan.

Description

technical field [0001] Embodiments described in this disclosure relate generally to wireless communication techniques. More specifically, the present embodiment relates to returning from the second network to the first network after premature termination of a circuit switched fallback (CSFB) voice call. Background technique [0002] Cellular networks using newer radio access technology (RAT) systems such as Long Term Evolution (LTE) systems are being developed and deployed. Networks using these newer RATs typically support faster data rates than networks utilizing legacy RATs, including second-generation (2G) and third-generation (3G) RATs, such as the Universal System for Mobile Communications ( UMTS) network and Global System for Mobile communications (GSM) network. However, in some deployments, LTE and other new RATs may not fully support some services that can be handled by legacy networks. Therefore, LTE networks are often co-deployed in overlapping areas with legacy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/00
CPCH04W36/08H04W36/00224H04W36/02H04W48/16H04W84/042
Inventor 王志伟
Owner APPLE INC
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