公开(公告)号：US20180084401A1

公开(公告)日：2018-03-22

申请号：US15592980

申请日：2017-05-11

Applicant: APPLE INC.

Inventor： Gahima S. MBONYE ,  Vijay VENKATARAMAN ,  Srinivasan NIMMALA ,  Thanigaivelu ELANGOVAN ,  Abdul-Munem Al-KHUDAIRI ,  Anish K. GOYAL ,  Rafael L. RIVERA-BARRETO ,  Yifan ZHU ,  Ryan BOOTH ,  Lakshmi KAVURI ,  Venkateswara Rao MANEPALLI

IPC: H04W8/02 ,  H04W72/04 ,  H04W48/16

CPC classification number: H04W8/02 ,  H04W8/06 ,  H04W48/12 ,  H04W48/16 ,  H04W48/20 ,  H04W88/06

Abstract: A method performed by a station that includes receiving information from a cell of a Public Land Mobile Network (PLMN), determining whether the information indicates the cell supports circuit switched fallback (CSFB) voice calls, when the CSFB voice calls are not supported, determining whether at least one packet switched voice property of the station satisfies a predetermined condition and attaching to the cell of the PLMN when the predetermined condition is satisfied. A further method performed by a station connected to a PLMN that includes identifying cells of the PLMN available for the station to camp on, determining whether the station is capable of executing packet switched calls, when the station is not capable of executing packet switched calls, determining whether the identified cells have a neighbor cell that supports CSFB voice calls and prioritizing the cells that are identified as having neighbor cells that support CSFB voice calls.