Qualcomm Incorporated

Giridhar Ramakrishnan

Cheol Hee Park

Arvind Vardarajan Santhanam

Sivaramakrishna Veerepalli

Ralph Akram Gholmieh

Feng Chen

Feng Lu

Srinivasan Rajagopalan

Subramanya P Rao

Ashish Shankar Iyer

Sean Vincent Maschue

Cheng Tan

Hamza Ijaz Abbasi

Jintao Hou

Yax Patel

Certain aspects of the present disclosure provide techniques for collision mitigation in sidelink. A method that may be performed by a user equipment (UE) includes measuring channel busy ratio (CBR), estimating a number of UEs using the channel, estimating a congestion level based on the CBR and the estimated number of UEs. A method that may be performed by a sidelink UE includes determining a semi-persistent scheduling (SPS) resource reservation including first subframes, determining second subframes for generated packet transmission, determining to skip transmission in the second subframes, listening during the second subframes for another sidelink UE's transmission, and determining whether to reselect resources. Another method includes listening during a first subframe for another sidelink UE's transmission, detecting the transmission collides with a scheduled transmission resource for the sidelink UE based on an amount of frequency resource overlap, and determining to reselect resources.

Packet collision mitigation in sidelink

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.

Cellular vehicle-to-everything out of coverage synchronization

Growing community of inventors

San Diego, CA, United States of America

Giridhar Ramakrishnan