Pedestrian safety communication system and method
A method at a power-limited computing station for communicating in an intelligent transport system, the method including operating the computing station in one of a non-critical radio operating state and a safety-critical radio operating state; receiving a trigger at the computing station; determining whether the trigger should cause the computing station to transition a radio operating state; and if the trigger should cause the computing station to transition the radio operating state, changing the radio operating state to the other of the non-critical radio operating state and the safety-critical radio operating state.
1. A method at a power-limited computing station for communicating in an intelligent transport system, the method comprising:
operating the computing station in one of a non-critical radio operating state and a safety-critical radio operating state, the safety-critical radio operating state having shorter sleep cycles to provide lower latency than the non-critical radio operating state for communications with one or more components of the intelligent transport system;
receiving a trigger at the computing station, the trigger including a wake-up radio signal comprising on-off-keying (OOK) signals;
determining whether the trigger should cause the computing station to transition a radio operating state;
when the trigger should cause the computing station to transition the radio operating state, changing the radio operating state to the other of the non-critical radio operating state and the safety-critical radio operating state; and
when the radio operating state is changed to the safety-critical radio operating state, transmitting a signal indicating that the radio operating state is the safety-critical radio operating state.
2. The method of claim 1 , wherein the non-critical radio operating state consumes less power resources but has a higher response latency than the safety-critical radio operating state.
3. The method of claim 1 , wherein the trigger includes a Bluetooth Low Energy signal received at the computing station.
4. The method of claim 1 , wherein the trigger is relayed from a vehicle or other computing station in the intelligent transport system using an infrastructure element.
5. The method of claim 1 , wherein the trigger includes one or more messages of the type of a Cooperative Awareness Message, a Personal Safety Message, or a Basic Safety message.
6. The method of claim 1 , wherein the changing to the safety-critical radio operating state causes a second radio to be activated on the computing station.
7. The method of claim 6 , wherein the second radio is a safety radio for intelligent transportation systems.
8. The method of claim 1 , wherein the changing to the non-critical radio operating state causes a radio on the computing station to use discontinuous reception.
9. The method of claim 1 , wherein the determining uses information from local sensors on the computing station in conjunction with the trigger.
10. The method of claim 1 , wherein the trigger is a message from a cellular base station providing an indication that the computing station is entering or leaving a geofenced area.
11. The method of claim 1 , wherein the determining ignores the trigger when the computing station is within a vehicle.
12. The method of claim 1 , wherein the determining ignores the trigger when the computing station is in a different plane from a transmitter that sent the trigger.
13. The method of claim 1 , wherein the determining differs based on time of day.
14. A power-limited computing station for communicating in an intelligent transport system, the computing station comprising:
a processor; and
a communications subsystem,
wherein the computing station is configured to:
operate in one of a non-critical radio operating state and a safety-critical radio operating state, the safety-critical radio operating state having shorter sleep cycles to provide lower latency than the non-critical radio operating state for communications with one or more components of the intelligent transport system;
receive a trigger at the computing station, the trigger including a wake-up radio signal comprising on-off-keying (OOK) signals;
determine whether the trigger should cause the computing station to transition a radio operating state;
when the trigger should cause the computing station to transition the radio operating state, change the radio operating state to the other of the non-critical radio operating state and the safety-critical radio operating state; and
when the radio operating state is changed to the safety-critical radio operating state, transmit a signal indicating that the radio operating state is the safety-critical radio operating state.
15. The computing station of claim 14 , wherein the non-critical radio operating state consumes less power resources but has a higher response latency than the safety-critical radio operating state.
16. The computing station of claim 14 , wherein the trigger includes a Bluetooth Low Energy signal received at the computing station.
17. The computing station of claim 14 , wherein the trigger is relayed from a vehicle or other computing station in the intelligent transport system using an infrastructure element.
18. The computing station of claim 14 , wherein the trigger includes one or more messages of the type of a Cooperative Awareness Message, a Personal Safety Message, or a Basic Safety message.
19. The computing station of claim 14 , wherein the computing station is configured to change to the safety-critical radio operating state by causing a second radio to be activated on the computing station.
20. The computing station of claim 19 , wherein the second radio is a safety radio for intelligent transportation systems.
21. The computing station of claim 14 , wherein the computing station is configured to change to the non-critical radio operating state by causing a radio on the computing station to use discontinuous reception.
22. The computing station of claim 14 , wherein the computing station is configured to determine using information from local sensors on the computing station in conjunction with the trigger.
23. The computing station of claim 14 , wherein the trigger is a message from a cellular base station providing an indication that the computing station is entering or leaving a geofenced area.
24. The computing station of claim 14 , wherein the computing station is configured to determine by ignoring the trigger when the computing station is within a vehicle.
25. The computing station of claim 14 , wherein the computing station is configured to determine by ignoring the trigger when the computing station is in a different plane from a transmitter that sent the trigger.
26. The computing station of claim 14 , wherein the computing station is configured to determine based on time of day.
27. A non-transitory computer readable medium containing instruction code, which, when executed by a processor of computing station, allow for communication in an intelligent transport system, the instruction code causing the computing station to:
operate in one of a non-critical radio operating state and a safety-critical radio operating state, the safety-critical radio operating state having shorter sleep cycles to provide lower latency than the non-critical radio operating state for communications with one or more components of the intelligent transport system;
receive a trigger at the computing station, the trigger including a wake-up radio signal comprising on-off-keying (OOK) signals;
determine whether the trigger should cause the computing station to transition a radio operating state;
when the trigger should cause the computing station to transition the radio operating state, change the radio operating state to the other of the non-critical radio operating state and the safety-critical radio operating state; and
when the radio operating state is chanted to the safety-critical radio operating state, transmit a signal indicating that the radio operating state is the safety-critical radio operating state.