US 11,902,925 B2
Autonomous vehicle and control method thereof
Jeongin Kim, Seoul (KR); and Dongsun Lee, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 17/906,466
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed May 22, 2020, PCT No. PCT/KR2020/006676
§ 371(c)(1), (2) Date Sep. 15, 2022,
PCT Pub. No. WO2021/235575, PCT Pub. Date Nov. 25, 2021.
Prior Publication US 2023/0137019 A1, May 4, 2023
Int. Cl. H04W 56/00 (2009.01)
CPC H04W 56/0015 (2013.01) [H04W 56/0035 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A control method of a distributed antenna system (DAS) including a baseband modem comprises the steps of:
calculating frequency offsets for each RF path in the baseband modem; controlling an oscillator clock of a central unit (CU) on the basis of an average of the frequency offsets;
determining an operation mode of the baseband modem;
controlling oscillator clocks of each distributed unit (DU) on the basis of the frequency offsets for each RF path when the operation mode of the baseband modem is a tracking mode; and
transmitting the oscillator clock of the central unit (CU) to each distributed unit (DU) when the operation mode of the baseband modem is an acquisition mode,
wherein in the tracking mode, oscillator clock errors of each distributed unit (DU) are individually controlled to have different values, and in the acquisition mode, the oscillator clock errors of each distributed unit (DU) are commonly controlled to have the same value.