Co-existence of millimeter wave communication and radar
Various aspects of the disclosure relate to co-existence of millimeter wave (mmW) communication and radar. In some aspects, a device that supports mmW communication and radar operations may determine whether or when to conduct radar operations based on information obtained about a nearby mmW network. For example, prior to sending radar signals, the device may monitor for mmW communication signals. As another example, the device may send at least one mmW communication signal to reserve a communication medium for subsequent radar operations. As yet another example, the device may conduct radar operations during idle or allocated time periods defined by the mmW network.
1. An apparatus for communication, the apparatus supporting a millimeter wave communication and a radar operation, and the apparatus comprising:
an interface configured to obtain millimeter wave communication information from another apparatus, wherein the obtained millimeter wave communication information comprises information related to a first millimeter wave channel used for the millimeter wave communication between the apparatus and the another apparatus; and
a processing system configured to control the radar operation at the apparatus for at least transmission of radar signals based on a type of the millimeter wave communication information obtained from the another apparatus,
wherein the control of the radar operation comprises determining whether or when to perform the radar operation at the apparatus according to the type of the obtained millimeter wave communication information,
wherein a determination of whether or when to perform the radar operation is performed after the millimeter wave communication information is obtained from the another apparatus, to avoid interference between the millimeter wave communication and the radar operation, and
wherein the radar operation and the millimeter wave communication co-exist in a same frequency band.
2. The apparatus of claim 1 , wherein:
the millimeter wave communication information comprises a base station signaling detected on the first millimeter wave channel; and
the control of the radar operation comprises electing to use a second millimeter wave channel for the radar operation after the obtaining of the millimeter wave communication information comprising the base station signaling detected on the first millimeter wave channel.
3. The apparatus of claim 1 , wherein:
the millimeter wave communication information indicates that a basic service set was detected on the first millimeter wave channel; and
the control of the radar operation comprises electing to use a second millimeter wave channel for the radar operation after the obtaining of the millimeter wave communication information that indicates that the basic service set was detected on the first millimeter wave channel.
4. The apparatus of claim 1 , wherein:
the millimeter wave communication information comprises control allocation signaling; and
the control of the radar operation comprises determining whether the control allocation signaling indicates that a channel can be used for the radar operation and commencing the radar operation if the channel can be used for the radar operation.
5. The apparatus of claim 1 , wherein:
the millimeter wave communication information comprises clear channel assessment information; and
the control of the radar operation comprises determining whether the clear channel assessment information indicates that a channel can be used for the radar operation and commencing the radar operation if the channel can be used for the radar operation.
6. The apparatus of claim 1 , wherein:
the millimeter wave communication information comprises a network allocation vector; and
the control of the radar operation comprises delaying the radar operation for a period of time based on the network allocation vector.
7. The apparatus of claim 1 , wherein:
the millimeter wave communication information comprises a sleep period advertised by a millimeter wave device; and
the control of the radar operation comprises conducting the radar operation during the sleep period.
8. The apparatus of claim 1 , wherein:
the millimeter wave communication information comprises a communication interval advertised by a millimeter wave device; and
the control of the radar operation comprises conducting the radar operation during a period of time indicated by the communication interval.
9. The apparatus of claim 8 , wherein the communication interval comprises a beacon time interval.
10. The apparatus of claim 1 , wherein:
the millimeter wave communication information comprises an allocation period; and
the control of the radar operation comprises conducting the radar operation during a period of time indicated by the allocation period.
11. The apparatus of claim 1 , wherein the processing system is further configured to control the millimeter wave communication at the apparatus.
12. The apparatus of claim 1 , wherein:
the millimeter wave communication information comprises spatial information; and
the control of the radar operation comprises using the spatial information to avoid radar in at least one direction and allow radar in at least one other direction.
13. An apparatus for communication in a network, the apparatus supporting a millimeter wave communication and a radar operation, and the apparatus comprising:
an interface configured to output, before a radar scan is started, at least one millimeter wave communication signal for transmission on a channel to inform other plurality of apparatuses in the network regarding an ongoing transmission of at least one radar signal; and
a processing system configured to commence the radar operation on the channel at the apparatus after the at least one millimeter wave communication signal is output, to avoid interference between the millimeter wave communication and the radar operation, wherein the radar operation comprises the interface outputting the at least one radar signal for the transmission on the channel,
wherein the radar operation and the millimeter wave communication co-exist in a same frequency band.
14. The apparatus of claim 13 , wherein the at least one millimeter wave communication signal comprises at least one control allocation signal.
15. The apparatus of claim 13 , wherein the at least one millimeter wave communication signal comprises a request-to-send or a clear to send.
16. The apparatus of claim 13 , wherein the at least one millimeter wave communication signal comprises a clear-to-send-to-self.
17. The apparatus of claim 13 , wherein the at least one millimeter wave communication signal comprises a directional multi-gigabit clear-to-send.
18. The apparatus of claim 13 , wherein the at least one millimeter wave communication signal comprises at least one training signal.
19. The apparatus of claim 13 , wherein the at least one millimeter wave communication signal comprises a sector sweep frame.
20. The apparatus of claim 13 , wherein the at least one millimeter wave communication signal comprises a short sector sweep frame.
21. The apparatus of claim 13 , wherein the at least one millimeter wave communication signal is for transmission via a directed mode.
22. The apparatus of claim 13 , wherein the at least one millimeter wave communication signal is for transmission via an omni-directional mode.