Page 22 - Use cases and requirements for the vehicular multimedia networks - Focus Group on Vehicular Multimedia (FG-VM)

7.2.3 Characteristics of the VMN connectivity

The VMN could have the following characteristics:
1) Be available on a connected vehicle (or/and autonomous vehicle).
2) Includes a connectivity layer allowing services to seamlessly use multiple bearers and
protocols (satellite, cellular, short range / broadcast, streaming, download). That connectivity
layer is usable by various sub-systems and services such as infotainment, maps or ADAS.
3) The VMS may connect to one or more communication networks, in particular:
– 3G/4G/5G cellular networks.
– Low Earth Orbit (LEO) bi-directional communication networks (e.g., [Starlink],
[Oneweb], [HongYan], [Hong Yun]).
– Satellites (e.g., L Band Broadcast) with both broadcast and bi-directional
communications.
– Short range networks such as DSRC (e.g., IEEE 802.11p; 802.11bd), C-V2X
(e.g., LTE-V (3GPP TS36.321), 5G PC5 (3GPPTR 38.885)).
– Terrestrial broadcast networks (e.g., FM, DAB, HD radio, CDR, DTMB, DVB-T2 and
upcoming FeMBMS).
Further, the following scenarios should be envisaged for VMN:
– The vehicle drives away from the coverage area of the wireless local area network (WLAN),
but access to services continue to be available via cellular network or satellite network.
– The vehicle drives away from the coverage area of the cellular network, but access to services
continue to be available via satellite communication.
– The vehicle drives away from the coverage area of the satellite network, but access to services
continue to be available via cellular communication (e.g., entering an underground parking).
– The vehicle drives away from the coverage area of the mobile network in a region where
satellite broadcasting systems are not deployed, but access to service continue to be available
via terrestrial broadcast communication.
– The VMS may prefer that large downloads such as map updates and security updates be
performed only on higher bandwidth network such as WLAN.
– Network connectivity may be billed to the driver, or it may be billed to the vehicle
manufacturer. In either case, the driver/manufacturer may want to limit types of data
transmitted over higher-cost networks. For example, diagnostic data can be uploaded at a
later time when WLAN is available, whereas safety related information may be downloaded
via any means available.
– The VMS may receive indicators over a broadcast network (e.g., radio data system (RDS)
program identifier) and connect to a server over a cellular or short-range data connection to
download metadata about the program [radiodns].

– The VMS may transmit/receive multimedia information such as image/video, voice and
broadcast messages (such as emergency messages received and retransmitted to nearby
vehicles) through wireless short-range communication networks (e.g., DSRC, C-V2X).

7.2.4 Requirements – VMS connectivity
CR1: The VMS should be designed to allow access via multiple communication networks.

CR2: The VMS may connect via multiple communication networks simultaneously.
CR3: The VMS may provide seamless handoffs between communication networks.

CR4: The VMS shall be inclusive of both bi-directional and broadcast communication networks.

12 FGVM-01R1 (2019)