TMC - Wide Area Broadcast

Description:

This solution is used within Australia, Canada, the E.U. and the U.S.. It combines standards associated with TMC with those for C-X: Wide Area Broadcast. The TMC standards include upper-layer standards required to support multi-modal information services to the vehicle. The C-X: Wide Area Broadcast standards include lower-layer standards that support one entity broadcasting information to all wireless devices over an area that covers at least a metropolitan area without any expectation of acknowledgement or response; security is provided by the upper-layers.

Comm Profile: C-X: Wide Area Broadcast

Level	Doc #	Standard	Description
Access		WAW Broadcast Alternatives	A set of alternative standards that describes various types of wide-area wireless broadcast mechanisms.
Mgmt		Proprietary	A proprietary mechanism to provide services for this layer.
Security		Proprietary	A proprietary mechanism to provide services for this layer.
TransNet		Proprietary	A proprietary mechanism to provide services for this layer.

Data Profile: TMC

Level	Doc #	Standard	Description
Facilities	ISO 14819-1	ISO 14819-1 RDS-TMC Protocol	ISO 14819-1 describes the ALERT-C protocol concept and message structure used to achieve densely coded messages to be carried in the RDS-TMC feature.
ITS Application Entity	ISO 14819-2	ISO 14819-2 RDS-TMC Codes	ISO 14819-1 describes the ALERT-C protocol concept and message structure used to achieve densely coded messages to be carried in the RDS-TMC feature. ISO 14819-2:2013 defines the Events List to be used in coding those messages.
ITS Application Entity	ISO 14819-3	ISO 14819-3 RDS-TMC Location Ref	ISO 14819-3 sets out ways of specifying places and positions in traffic and travel information messages, including RDS-TMC messages (the Radio Data System - Traffic Message Channel). It primarily addresses the needs of RDS-TMC ALERT-C messages which are already being implemented. However, the modular approach used is intended to facilitate future extension of the location referencing rules to other traffic and travel messaging systems.
Security	ISO 14819-6	ISO 14819-6 RDS-TMC Encryption	ISO 14819-6 establishes a method of encrypting certain elements of the ALERT-C coded data carried in the RDS-TMC type 8A data group, such that without application by a terminal or receiver of an appropriate keys, the information conveyed is virtually worthless. The specification also describes considerations for service providers wishing to introduce an encrypted RDS-TMC service, migrating from either a ""free-to-air"" service based on public ""Location Tables"" or a commercial service based on a proprietary location table.

Readiness Description:

One significant or possibly a couple minor issues. For existing deployments, the chosen solution likely has identified security or management issues not addressed by the communications solution. Deployers should consider additional security measures, such as communications link and physical security as part of these solutions. They should also review the management issues to see if they are relevant to their deployment and would require mitigation. For new deployments, the deployment efforts should consider a path to addressing these issues as a part of their design activities. The solution does not by itself provide a fully secure implementation without additional work.