公开(公告)号：US20190223221A1

公开(公告)日：2019-07-18

申请号：US16145788

申请日：2018-09-28

Applicant: MEDIATEK INC.

Inventor： Per Johan Mikael Johansson ,  Shiang Jiun Lin ,  Li-Chuan Tseng ,  Gilles Charbit

IPC: H04W74/08 ,  H04W76/27 ,  H04W76/19 ,  H04W68/02 ,  H04W72/04 ,  H04W88/02

CPC classification number: H04W74/0833 ,  H04W68/02 ,  H04W72/0453 ,  H04W76/00 ,  H04W76/19 ,  H04W76/27 ,  H04W88/023

Abstract: A method of high reliability and early data transmission (EDT) is proposed. EDT allows one uplink transmission (optionally) followed by one downlink data transmission during a random-access channel (RACH) procedure, which can reduce the signaling overhead and save UE power. To improve reliability, for uplink EDT, there would be different set of RACH reattempt parameters in the UE for different types of access. For downlink EDT, there would be an indication in the paging message to trigger whether the UE would use legacy RACH or not. Further, the configuration for PRACH resource for EDT can be independent to legacy PRACH resource configuration. Under certain conditions, UE can fallback to legacy RACH procedure for high reliability.