Method for proximity detection in a wireless communication network
First Claim
1. A method for proximity detection in a wireless communication network, the method comprising:
- assigning, by a ranging node, a current group comprising a plurality of target nodes;
sub-dividing, by the ranging node, the current group into two or more sub-groups;
transmitting a first ranging request from the ranging node to a first plurality of target nodes within a first sub-group;
receiving responses to the first ranging request, from one or more of the first plurality of target nodes, at the ranging node, wherein the received responses comprise at least one identical response frame; and
determining a proximity range of at least one target node closest to the ranging node, wherein response from a target node has an earliest time of arrival of the received responses at the ranging node.
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Abstract
A method for proximity detection in a wireless communication network. A node attempts to determine the proximity of the closest neighboring node by transmitting a ranging request. Other nodes respond, and the first node to receive and respond to the request will have the shortest response time and thus will be the closest node. Exact ranges can be determined by applying Time-Of-Arrival (TOA) techniques to node response times. To further avoid collisions, one or more frames of the response messages can be same, making the multiple responses appear as multi-path. The group of responders can be narrowed and individual groups probed in a search pattern until the single nearest node is known or range of the nearest node is known. The ranging node may then use ordinary unicast mechanisms to probe this node, or begin scanning the groups again, or interleave the two mechanisms as desired.
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Citations
16 Claims
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1. A method for proximity detection in a wireless communication network, the method comprising:
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assigning, by a ranging node, a current group comprising a plurality of target nodes; sub-dividing, by the ranging node, the current group into two or more sub-groups; transmitting a first ranging request from the ranging node to a first plurality of target nodes within a first sub-group; receiving responses to the first ranging request, from one or more of the first plurality of target nodes, at the ranging node, wherein the received responses comprise at least one identical response frame; and determining a proximity range of at least one target node closest to the ranging node, wherein response from a target node has an earliest time of arrival of the received responses at the ranging node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification