Synchronization in a wireless node
AssigneeHewlett-Packard Development Company, L.P.
InventorsRaul Hernan Etkin, Jung Gun Lee
Life of this patent
Estimating the term…
Abstract
A wireless node clock is periodically synchronized with a wireless access point clock. The wireless access point clock is globally synchronized with other access points in a network. Failure of the access point is detected. A search is performed for a beacon signal of a neighboring wireless access point that is associated with the network. The neighboring access point also has a globally synchronized clock. The wireless node clock is synchronized with the globally synchronized clock of the neighboring wireless access point.
Claims20
A method, comprising:
- periodically synchronizing a wireless node clock for a wireless node with a primary wireless access point clock, wherein the primary wireless access point clock is globally synchronized with other access points in a network;
- detecting a failure of the primary access point;
- searching for a beacon signal of a neighboring wireless access point associated with the network, the neighboring wireless access point having a globally synchronized clock;
- and
- synchronizing the node clock with the globally synchronized clock of the neighboring wireless access point.
A wireless node, comprising:
- a receiver to wirelessly receive clock synchronization signals from a wireless access point (AP) on a receiving channel;
- an AP failure detection module to detect failure of a primary wireless AP;
- the receiver, in response to detecting failure of the primary wireless AP, to automatically change the receiving channel to receive clock synchronization signals from a neighboring wireless AP;
- and
- a synchronization module to synchronize a node clock with a neighboring wireless AP clock if failure of the primary wireless AP is detected.
A wireless access point, comprising:
- a clock synchronized to other access point clocks on a network;
- and
- a transmitter to transmit timing synchronization beacons to one or more nodes that are outside a Basic Service Set (BSS) associated with the access point.
A method, comprising:
- a wireless node detecting failure of a primary wireless access point having a globally synchronized clock for a network;
- searching for a beacon signal of a neighboring wireless access point associated with the network, the neighboring wireless access point having a globally synchronized clock;
- and
- receiving from neighboring wireless access point a beacon having a wireless protocol time synchronization function (TSF) timestamp generated with reference to the globally synchronized clock;
- sampling sensory data on the wireless node;
- tagging the sensory data with the TSF timestamp, the tagged sensory data to be processed by an external entity based on the TSF timestamp to reflect synchronization with the global clock.
Dependencies are inferred from the claim text.