System and Method for Secure Wakeup in a Communication System

11) A system of transmitting a wakeup code from a first node to a second node, said system comprising:

• a first node, wherein the first node comprises a wakeup transmitter of the first node and a second communication transceiver of the first node;
• a second node, wherein the second node comprises a wakeup receiver of the second node and a second communication transceiver of the second node;
• wherein the wakeup transmitter of the first node is configured to transmit a predetermined wakeup code to the wakeup receiver of the second node using a first communication link;
• wherein a second communication transceiver of the first node and/or a second communication transceiver of the second node is configured to establish a protocol for future wakeup codes periodically between the first node and the second node using a second communication link;
• wherein the second communication link is provided between the second communication transceiver of the first node and the second communication transceiver of the second node;
• wherein the second communication transceiver of the first node and/or the second communication transceiver of the second node is configured to update the wakeup code based on at least one of:
• the protocol for future wakeup codes, a first function of time defined by the protocol for future wakeup codes, a second function of number of wakeups defined by the protocol for future wakeup codes;
• the second node is configured to compare the wakeup code received by the second node with a template wakeup code derived from the protocol for future wakeup codes;
• and
• the receiver is configured to wake up if the wakeup code received by the second node matches the template wakeup code;
• the receiver is configured to sleep if the code received by the second node does not match the template wakeup code.