Systems and methods to synchronize wireless devices in the presence of a FMCW radio altimeter
First Claim
1. A wireless device network, the network comprising:
- a plurality of device nodes that share a radio frequency spectrum using time-division multiple accesses;
a network synchronizing device in wireless communication with the plurality of device nodes, the network synchronizing device coupled to a timeslot allocation function, wherein the timeslot allocation function allocates to the network synchronizing device an allocated timeslot from a frame of timeslots on a first designated synchronization channel within the radio frequency spectrum;
wherein the network synchronizing device broadcasts an arbitrary timeslot synchronization beacon to the plurality of device nodes on the first designated synchronization channel in the allocated timeslot, wherein the arbitrary timeslot synchronization beacon is arbitrary in that the allocated timeslot from the frame of timeslots for broadcasting of the arbitrary timeslot synchronization beacon is delinked from any periodicity;
wherein the arbitrary timeslot synchronization beacon comprises a Sync Timeslot identifier that indicates which timeslot of the frame of timeslots the arbitrary timeslot synchronization beacon was transmitted in, and a Sync Time indicator that includes a time that the arbitrary timeslot synchronization beacon was transmitted.
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Abstract
Systems and methods to synchronize wireless device nodes in the presence of a FMCW radio altimeter are provided. In one embodiment, a wireless device network comprises: a plurality of device nodes that share a radio frequency spectrum using time-division multiple accesses; a network synchronizing device in wireless communication with the plurality of device nodes, the network synchronizing device coupled to a timeslot allocation function, wherein the timeslot allocation function allocates to the network synchronizing device a timeslot on a first designated synchronization channel within the radio frequency spectrum; wherein the network synchronizing device broadcasts an arbitrary timeslot synchronization beacon to the plurality of device nodes on the first designated synchronization channel in the timeslot; wherein the arbitrary timeslot synchronization beacon comprises a Sync Timeslot identifier that identifies the timeslot, and a Sync Time indicator that includes a time that the arbitrary timeslot synchronization beacon was transmitted.
68 Citations
20 Claims
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1. A wireless device network, the network comprising:
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a plurality of device nodes that share a radio frequency spectrum using time-division multiple accesses; a network synchronizing device in wireless communication with the plurality of device nodes, the network synchronizing device coupled to a timeslot allocation function, wherein the timeslot allocation function allocates to the network synchronizing device an allocated timeslot from a frame of timeslots on a first designated synchronization channel within the radio frequency spectrum; wherein the network synchronizing device broadcasts an arbitrary timeslot synchronization beacon to the plurality of device nodes on the first designated synchronization channel in the allocated timeslot, wherein the arbitrary timeslot synchronization beacon is arbitrary in that the allocated timeslot from the frame of timeslots for broadcasting of the arbitrary timeslot synchronization beacon is delinked from any periodicity; wherein the arbitrary timeslot synchronization beacon comprises a Sync Timeslot identifier that indicates which timeslot of the frame of timeslots the arbitrary timeslot synchronization beacon was transmitted in, and a Sync Time indicator that includes a time that the arbitrary timeslot synchronization beacon was transmitted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A network synchronizing device for a wireless system network, the device comprising:
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a wireless radio interface; and a processor coupled to a memory; wherein based on a clock signal from a Master Wireless Clock, the processor maintains a Master Timeslot Counter that indicates a current timeslot of a current wireless system frame, and a Master Slot Time Clock that defines starting and ending edges of the current timeslot; wherein the processor is configured to receive a timeslot allocation from a Wireless Timeslot Allocation Function that indicates an allocated timeslot from a frame of timeslots in which it is permitted to transmit an arbitrary timeslot synchronization beacon on a first designated synchronization channel; wherein when the allocated timeslot occurs, the processor transmits, via the wireless radio interface, the arbitrary timeslot synchronization beacon, the arbitrary timeslot synchronization beacon comprising a Sync Timeslot identifier that identified which timeslot of the frame of timeslots the arbitrary timeslot synchronization beacon was transmitted in as indicated by the Master Timeslot Counter and a Sync Time indicator that indicates a time that the arbitrary timeslot synchronization beacon was transmitted; wherein the arbitrary timeslot synchronization beacon is arbitrary in that the allocated timeslot from the frame of timeslots for broadcasting of the arbitrary timeslot synchronization beacon is delinked from any periodicity. - View Dependent Claims (11)
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12. A method for synchronizing a wireless network sharing a radio spectrum with a radio altimeter, the method comprising:
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receiving a time divisional multiple access (TDMA) timeslot allocation for a first frequency channel, wherein the first frequency channel comprises a frequency spectrum periodically shared with a radio altimeter signal; and transmitting an arbitrary timeslot synchronization beacon (ATSB) during an allocated timeslot from a frame of timeslots indicated by the timeslot allocation, wherein the arbitrary timeslot synchronization beacon includes a sync timeslot identifier that indicates which timeslot of the frame of timeslots the arbitrary timeslot synchronization beacon was transmitted in, and a sync time indicator identifying a time the arbitrary timeslot synchronization beacon is transmitted; wherein the arbitrary timeslot synchronization beacon is arbitrary in that the allocated timeslot from the frame of timeslots for broadcasting of the arbitrary timeslot synchronization beacon is delinked from any periodicity. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification