Secure multicast/broadcast ranging
Methods performed by a first device. The methods include transmitting a first ranging poll to a plurality of second devices, receiving a polling response message from each of at least a first subset of the second devices, determining a propagation delay for each of the received polling response messages and determining a distance to each of the first subset of the second devices based on at least the respective propagation delays. The methods further include receiving a ranging poll from a second device, wherein the ranging poll is one of a multicast transmission or a broadcast transmission, determining a type of response to be transmitted to the second device based on at least a capability of the first device and transmitting a response of the determined type to the second device.
1. A method, comprising:
at a first device:
transmitting a first ranging poll to a plurality of second devices, wherein the first ranging poll includes one of an identification of a type of ranging operation, a number of ranging rounds to be performed, a duration of a ranging round, a number of response slots, a ranging round counter, a pointer to a next ranging poll, an indication of whether the polling response messages are scheduled, a slot assignment for the polling response messages or a maximum number of attempts for each polling response message;
receiving a polling response message from each of at least a first subset of the second devices;
determining a respective propagation delay for each of the received polling response messages; and
determining a respective distance to each of the first subset of the second devices based on at least the respective propagation delays.
2. The method of claim 1 , further comprising:
transmitting a second ranging poll to the plurality of second devices;
receiving a time stamp response message from each of at least a second subset of the second devices; and
determining a respective distance to each of the second subset of the second devices based on at least the respective time stamp response message.
3. The method of claim 1 , further comprising:
transmitting a pre-poll message including ranging configuration information to the plurality of second devices.
4. The method of claim 1 , further comprising:
transmitting time stamp information to the plurality of second devices.
5. The method of claim 1 , wherein the first device and the plurality of second devices are communicatively coupled via an ultra-wideband (UWB) network.
6. The method of claim 1 , wherein the transmitting the first ranging poll to the plurality of second devices is a broadcast transmission, wherein the first device and each of the plurality of second devices share a common key to exchange station-to-station messages.
7. The method of claim 1 , wherein the transmitting the first ranging poll to the plurality of second devices is a multicast transmission based on the first device including information corresponding to a number of the plurality of second devices and an identity of each of the plurality of secondary devices.
8. A device, comprising:
a transceiver configured to transmit a first ranging poll to a plurality of second devices and receive a polling response message from each of at least a first subset of the second devices, wherein the first ranging poll includes one of an identification of a type of ranging operation, a number of ranging rounds to be performed, a duration of a ranging round, a number of response slots, a ranging round counter, a pointer to a next ranging poll, an indication of whether the polling response messages are scheduled, a slot assignment for the polling response messages or a maximum number of attempts for each polling response message; and
a processor configured to determine a respective propagation delay for each of the received polling response messages and determine a respective distance to each of the first subset of the second devices based on at least the respective propagation delays.
9. The device of claim 8 , wherein the transceiver is further configured to transmit a second ranging poll to the plurality of second devices and receive a time stamp response message from each of at least a second subset of the second devices, wherein the processor is further configured to determine a respective distance to each of the second subset of the second devices based on at least the respective time stamp response message.
10. The device of claim 8 , wherein the first device and the plurality of second devices are communicatively coupled via an ultra-wideband (UWB) network.
11. The device of claim 8 , wherein the transmitting the first ranging poll to the plurality of second devices is a broadcast transmission, wherein the first device and each of the plurality of second devices share a common key to exchange station-to-station messages.
12. The device of claim 8 , wherein the transmitting the first ranging poll to the plurality of second devices is a multicast transmission based on the first device including information corresponding to a number of the plurality of second devices and an identity of each of the plurality of secondary devices.
13. The device of claim 8 , wherein the transceiver is further configured to transmit a pre-poll message including ranging configuration information to the plurality of second devices.
14. The device of claim 8 , wherein the transceiver is further configured to transmit time stamp information to the plurality of second devices.
15. A processor of a first device configured to perform operations comprising:
transmitting a first ranging poll to a plurality of second devices, wherein the first ranging poll includes one of an identification of a type of ranging operation, a number of ranging rounds to be performed, a duration of a ranging round, a number of response slots, a ranging round counter, a pointer to a next ranging poll, an indication of whether the polling response messages are scheduled, a slot assignment for the polling response messages or a maximum number of attempts for each polling response message;
receiving a polling response message from each of at least a first subset of the second devices;
determining a respective propagation delay for each of the received polling response messages; and
determining a respective distance to each of the first subset of the second devices based on at least the respective propagation delays.
16. The processor of claim 15 , wherein the operations further comprise:
transmitting a second ranging poll to the plurality of second devices;
receiving a time stamp response message from each of at least a second subset of the second devices; and
determining a respective distance to each of the second subset of the second devices based on at least the respective time stamp response message.
17. The processor of claim 15 , wherein the operations further comprise:
transmitting a pre-poll message including ranging configuration information to the plurality of second devices.
18. The processor of claim 15 , wherein the first device and the plurality of second devices are communicatively coupled via an ultra-wideband (UWB) network.
19. The processor of claim 15 , wherein the transmitting the first ranging poll to the plurality of second devices is one of (i) a broadcast transmission, wherein the first device and each of the plurality of second devices share a common key to exchange station-to-station messages or (ii) a multicast transmission based on the first device including information corresponding to a number of the plurality of second devices and an identity of each of the plurality of secondary devices.
20. The processor of claim 15 , wherein the operations further comprise:
transmitting time stamp information to the plurality of second devices.