公开(公告)号：US20190223091A1

公开(公告)日：2019-07-18

申请号：US16245483

申请日：2019-01-11

Applicant: MEDIATEK INC.

Inventor： Chien-Chun Huang-Fu ,  Hung Lin Chang

IPC: H04W48/18 ,  H04W48/14 ,  H04W76/15 ,  H04L27/26 ,  H04L5/00 ,  H04W72/12

CPC classification number: H04W48/18 ,  H04L5/0064 ,  H04L27/2666 ,  H04W48/14 ,  H04W72/1236 ,  H04W76/15

Abstract: A method of providing assistance information to improve the performance of Public Land Mobile Network (PLMN) selection is proposed. UE starts to perform PLMN selection procedure and searches for the first cell. The first cell can be an LTE cell or an NR cell served by a first base station. UE receives assistance information via system information broadcasted by the first base station. The assistance information comprises frequency band of NR/LTE cells, PLMN ID, subcarrier spacing (SCS) for NR cells, and RAT/system priority. UE then determines its PLMN/RAT preference, e.g., based on the availability of NR cells or LTE ENDC cells. Finally, UE continues the PLMN selection procedure searching for NR cell or LTE cell based on the assistance information.