VoLTE Call Establishment in TD and FDD LTE Networks

摘要

This application discloses various techniques for call establishment using voice-over LTE (VoLTE) in networks supporting time division (TD) and frequency division duplexed (FDD) LTE communication systems. Such techniques can include systems and methods for mobile-originated calls for a UE in a TD-LTE cell, systems and methods for mobile-terminated calls for a connected UE in a TD-LTE cell and systems and methods for mobile-terminated calls for an idle UE in a TD-LTE cell. These methods and systems can leverage component carriers from a carrier aggregating capable UE to facilitate more efficient and/or effective UE call establishment.

主权项

1. A method for making a mobile originated (MO) call by a mobile device in a time-division Long-Term Evolution (TD-LTE) wireless communication cell, the mobile device being voice over LTE (VoLTE) capable and carrier aggregation (CA) capable, with a plurality of component carrier (CC) chains, comprising:
performing an inter radio access technology (iRAT) measurement for a frequency division duplexed LTE (FDD-LTE) cell using fewer than all CC chains of the plurality of CC chains; receiving an indication for making the MO call; and if the FDD-LTE cell is available as indicated from the iRAT measurement:
attaching to the FDD-LTE cell; andusing VoLTE for making the MO call.