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1. (WO2017200735) BEAM AND SYMBOL SELECTION TO TRANSMIT RACH

Pub. No.:    WO/2017/200735    International Application No.:    PCT/US2017/030366
Publication Date: Fri Nov 24 00:59:59 CET 2017 International Filing Date: Tue May 02 01:59:59 CEST 2017
IPC: H04W 52/42
H04W 52/50
H04B 7/0408
Applicants: QUALCOMM INCORPORATED
Inventors: ISLAM, Muhammad Nazmul
LUO, Tao
SADIQ, Bilal
CEZANNE, Juergen
LI, Junyi
Title: BEAM AND SYMBOL SELECTION TO TRANSMIT RACH
Abstract:
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may identify a number of beam directions that satisfy a transmission power condition. The UE may select a beam direction for a random access signal by choosing one of the beam directions that satisfies additional criteria, such as transmitting a random access message at the next opportunity. The transmission power may be selected based on a target receive power and a path loss for the selected beam. In some cases, if the sum of the path loss for a beam direction and the target receive power exceeds a maximum transmission power by more than a predetermined amount, the random access signal will not be transmitted using that beam. In some cases, if a response to the random access is not received, a different beam direction may be selected, the transmission power may be increased, or both.