HANDOVER OF MULTIMODE USER EQUIPMENT BETWEEN RADIO ACCESS TECHNOLOGIES FOR REDUCED CALL SETUP TIME

• Main Author: RAMACHANDRAN SHYAMAL
• Format: Patent
• Language: English; Korean
• Published: 26.06.2013
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; WIRELESS COMMUNICATIONS NETWORKS

A communication system that employs Wireless Wide Area Networks (WWAN) of different Radio Access Technologies (RATs) ensures that simultaneous handover to 1×RTT and 1×EVDO is attempted only when warranted. The User Equipment (UE) that has multiple transceivers and is actively involved in a packet data session can be transferred from LTE to 1×EVDO. A criterion (e.g., cost, subscriber preference, operator preference, or network data traffic) can be used to determine when it is warranted to incur the setup delay time to perform simultaneous handover of both a voice connection and a packet data session. Conversely, if there is no active data session, generally the UE can be handed over only to 1×RTT for the voice/Short Message Service (SMS) call. In an aspect, the criterion can still dictate setting up simultaneously even for an active packet data session, such as for maintaining a time critical function of the device.