Intelligent transport system message control method and arrangement

A method for message control in a cooperative intelligent transport system, the method comprising:

• receiving, at an on-board unit, a transmission restriction control message, said transmission restriction control message comprising:
• i) a restriction instruction to be applied by said on-board unit and ii) validity information indicating a condition under which the restriction instruction is valid, wherein the restriction instruction comprises transmitter type information specifying one or more transmitter node types to which the restriction instruction applies;
• determining whether or not said on-board unit satisfies the condition;
• and
• as a result of determining that said on-board unit satisfies the condition, adapting transmissions from said on-board unit of messages according to said restriction instruction.

A node configured for communication with on-board units in a cooperative intelligent transport system, wherein said node is configured to:

• create a transmission restriction control message comprising:
• i) a restriction instruction to be applied by an on-board unit and ii) validity information indicating a condition under which the restriction instruction is valid, wherein the restriction instruction comprises transmitter type information specifying one or more transmitter node types to which the restriction instruction applies;
• and
• broadcast said transmission restriction control message.

An on-board unit of a cooperative intelligent transport system, wherein said on-board unit is configured to:

• receive a transmission restriction control message, said transmission restriction control message comprising:
• i) a restriction instruction to be applied by said on-board unit and ii) validity information indicating a condition under which the restriction instruction is valid, wherein the restriction instruction comprises transmitter type information specifying one or more transmitter node types to which the restriction instruction applies;
• determine whether or not said on-board unit fulfils said validity information;
• and
• adapt, if said on-board unit fulfils said validity information, transmissions from said on-board unit of messages according to said restriction instruction.