Method of transmitting messages
To provide a method of transmitting messages, using a transmission protocol having time-slots, that allows the messages to be transmitted in a flexible way, it is proposed that each message has a message identifier assigned to it, that the messages are placed in order in a queue, and that the queue has a set of slot identifiers assigned to it.
1. A method of transmitting messages using a transmission protocol having time-slots, characterized in that each message has a message identifier assigned to it, the method comprising:
placing the messages in order in a queue, the queue having a set of slot identifiers assigned to it; and
in response to one of the set of slot identifiers assigned to the queue becoming available, transmitting the next message in the queue using the one of the set of slot identifiers, wherein the set of time slot identifiers are used to transmit messages in dynamic time slots of the transmission protocol.
2. A method as claimed in claim 1 , characterized in that the queue is handled by a first-in-first-out (FIFO) method.
3. A method as claimed in claim 1 , characterized in that a lapsing time is assigned to each message.
4. A method as claimed in claim 1 , characterized in that messages are transmitted between a plurality of nodes, or a host, on a network.
5. A method as claimed in claim 1 , characterized in that the messages are transmitted in accordance with the FlexRay protocol.
6. A method as claimed in claim 1 , characterized in that a number of messages (M) are transmitted with a number of time-slots (N), where M>N.
7. Use of the method as claimed in claim 1 in automotive engineering.
8. The method of claim 1 , wherein:
the set of slot identifiers assigned to the queue includes a plurality of slot identifiers.
9. The method of claim 1 , wherein:
the transmission protocol includes N time-slots; and
the set of slot identifiers assigned to the queue includes M identifiers, where 0<M<N.
10. The method of claim 1 , wherein transmitting the next message in the queue includes transmitting the message with the message identifier assigned to the message, in a time slot identified by the one of the set of slot identifiers.
11. The method of claim 10 , further including receiving the transmitted message, and using the message identifier to identify the message independently from the time slot in which the message is transmitted.
12. A method of transmitting messages between a plurality of nodes on a network using a transmission protocol having time-slots, characterized in that each message has a message identifier assigned to it, the method comprising:
for each of one or more of the nodes:
assigning a respective set of time-slot identifiers to a queue of the node;
placing the messages received at the node in order in a queue; and
in response to a time-slot corresponding to one of the respective set of time-slot identifiers becoming available, transmitting the next message in the queue using the one of the respective sets of time-slot identifiers, wherein the set of time slot identifiers are used to transmit messages in dynamic time slots of the transmission protocol.
13. The method of claim 12 , further comprising, for at least one of the plurality of nodes, assigning a message identifier to a respective time slot and corresponding time-slot identifier; and
in response to receiving a message having said message identifier, transmitting the message using the time-slot corresponding to the message identifier.
14. The method of claim 13 , wherein:
the transmission protocol is the FlexRay protocol;
the respective set of time slot identifiers corresponding to the one or more of the nodes are used to transmit messages in dynamic time slots of the FlexRay protocol; and
the time-slot identifier corresponding to the at least one of the one or more nodes is used to transmit messages in a static time slot of the FlexRay protocol.
15. The method of claim 12 , wherein transmitting the next message includes transmitting the message identifier assigned to the message.
16. The method of claim 12 , wherein transmitting the next message in the queue includes transmitting the message with the message identifier assigned to the message, in a time slot identified by the one of the set of slot identifiers.
17. The method of claim 16 , further including receiving the transmitted message, and using the message identifier to identify the message independently from the time slot in which the message is transmitted.