2 results about "Frame Relay" patented technology

A vehicle-mounted communication system includes: a plurality of vehicle-mounted devices; and a relay device, wherein a first vehicle-mounted device of the vehicle-mounted devices transmits a frame addressed to a second vehicle-mounted device of the vehicle-mounted devices to the relay device, the frame being a frame for transmission and reception of information between the first vehicle-mounted device and the second vehicle-mounted device, and the relay device determines whether or not relay of the frame to the second vehicle-mounted device is permissible based on a result of comparison between a required safety level and a system safety level, the required safety level being a level of safety required for communication between the first vehicle-mounted device and the second vehicle-mounted device, the system safety level being at least based on function safety levels of the first vehicle-mounted device and the second vehicle-mounted device regarding safety of a vehicle.

The present disclosure relates to communication range extension using a relay in a wireless LAN system. According to an embodiment of the present disclosure, provided is a method comprising the steps in which: a relay station (STA) receives a first beacon frame from an access point (AP); the relay STA transmits, to an end STA, a second beacon frame including relay transmission notification and at least a portion of information included in the first beacon frame, wherein the relay transmission notification indicates that a frame including the relay transmission notification is transmitted by the relay STA; the relay STA relays one or more frames for association between the AP and the end STA on the basis of the transmission of the second beacon frame including the relay transmission notification; and the relay STA relays data transmission between the AP and the end STA after the AP and the end STA are associated with each other.