公开(公告)号：US10470143B2

公开(公告)日：2019-11-05

申请号：US15919622

申请日：2018-03-13

Applicant: QUALCOMM INCORPORATED

Inventor： Michael Corley ,  Arvind Vardarajan Santhanam ,  Scott Hoover ,  Aamod Khandekar ,  Subramanya Rao ,  Prabhu Kandasamy ,  Alexandre Pierrot

IPC: H04W56/00 ,  H04W4/46 ,  H04B1/7073 ,  H04W72/04 ,  H04B1/7083 ,  G08G1/16 ,  H04W4/44 ,  H04W72/08

Abstract: A method for communication includes obtaining a timing signal from a timing synchronization reference source, computing a system frame number (SFN)—direct frame number (DFN) offset, creating a timing fingerprint using the timing signal and the SFN-DFN offset, the timing fingerprint also comprising additional timing information, entering the timing fingerprint into a database, continually updating the timing fingerprint, determining whether the timing signal remains within a threshold, if the timing signal exceeds the threshold, iterating the timing fingerprint, verifying the timing fingerprint to determine whether there is a timing inconsistency between a most recent timing fingerprint and current time, if the timing fingerprint is verified, using the SFN-DFN offset to derive current DFN timing to decode a sidelink control information (SCI) communication, and if the SCI communication is decoded, using the timing signal for communicating over a sidelink communication channel.

公开(公告)号：US11357015B2

公开(公告)日：2022-06-07

申请号：US16228200

申请日：2018-12-20

Applicant: QUALCOMM Incorporated

Inventor： Cheol Hee Park ,  Ashish Shankar Iyer ,  Arvind Vardarajan Santhanam ,  Hongsan Sheng ,  Subramanya Rao ,  Feng Lu ,  Santosh Kumar Rongala ,  Li Sheng ,  Yuanbo Wang

IPC: H04W72/08 ,  H04W24/08 ,  H04W4/40 ,  H04L43/16 ,  H04B17/318 ,  H04W72/04

Abstract: Aspects of the present disclosure implement techniques that allow a vehicle performing V2X communications to provide more accurate S-RSSI measurements and CBR calculations for use in channel selection and congestion control. Techniques may include measuring a sidelink received signal strength indicator (S-RSSI) for each of a plurality of sub-channels, determining one or more signal impairment adjustment factors based on the S-RSSI for each of the plurality of sub-channels, calculating a channel busy ratio (CBR) for the plurality of sub-channels based on the one or more signal impairment adjustment factors, and initiating communication with at least one of the plurality of sub-channels based on at least the CBR.

公开(公告)号：US11140641B2

公开(公告)日：2021-10-05

申请号：US16596619

申请日：2019-10-08

Applicant: QUALCOMM Incorporated

Inventor： Cheol Hee Park ,  Feng Lu ,  Arvind Vardarajan Santhanam ,  Subramanya Rao ,  Sivaramakrishna Veerepalli ,  Cheng Tan ,  Sean Vincent Maschue ,  Ashish Shankar Iyer ,  Giridhar Ramakrishnan ,  Yax Patel ,  Srinivasan Rajagopalan

IPC: H04W56/00 ,  H04W4/40 ,  H04W84/00 ,  H04W80/02

Abstract: Aspects directed towards synchronizing out of coverage (OOC) vehicle-to-everything (V2X) communications are disclosed. In one example, a scheduled entity detects a loss of a synchronization signal associated with a V2X communication by detecting when a timing uncertainty value or error value is greater than a threshold value. Packet timing information is then received in response to the loss of the synchronization signal from at least one user equipment (UE) synchronized with the synchronization signal. The scheduled entity then maintains the V2X communication by performing a timing adjustment based on the packet timing information.

公开(公告)号：US20200313706A1

公开(公告)日：2020-10-01

申请号：US16778664

申请日：2020-01-31

Applicant: QUALCOMM Incorporated

Inventor： Kapil Gulati ,  Junyl Li ,  Tien Viet Nguyen ,  Subramanya Rao ,  Sudhir Kumar Baghel

IPC: H04B1/10 ,  H04B17/318 ,  H04W72/04 ,  H04L1/18

Abstract: Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may receive one or more transmissions from one or more UEs in a first slot, including a first transmission from a second UE. The first UE may receive the first transmission using a receiver configured with a first gain and may decode the first transmission. The UE may determine a correspondence (e.g., a temporal correlation) between the first slot and a second slot and may configure the receiver with a second gain at the beginning of the second slot based on the correspondence. The UE may determine that a total received signal power in the second slot is associated with the total received signal power in the first slot. The UE may decode one or more transmissions in the second slot based on the receiver having the second gain at the beginning of the slot.