Detecting wireless interlopers

• US 8,161,528 B2
• Filed: 10/07/2003
• Issued: 04/17/2012
• Est. Priority Date: 10/07/2003
• Status: Active Grant

• Current Assignee: XR Communications, LLC
• Original Assignee: XR Communications, LLC
• Inventors: Crilly, William J. Jr.
• Primary Examiner(s): POWERS, WILLIAM S
• Application Number:
  US10/680,965
• Publication Number:
  US 20050075070A1
• Time in Patent Office: 3,115 Days
• Field of Search: 726/23, 726/3
• US Class Current: 726/3
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements

Abstract

In an exemplary apparatus implementation, an apparatus includes: at least one processor; and one or more media including processor-executable instructions that are capable of being executed by the at least one processor, the processor-executable instructions adapted to direct the apparatus to perform actions including: monitoring at least one signal characteristic for multiple signals that relate to a single source address; and detecting a wireless interloper if a discrepancy is determined to exist with regard to the monitored at least one signal characteristic for the multiple signals. In an exemplary access station implementation, an access station is capable of ascertaining at least one signal characteristic for multiple signals, is configured to detect a wireless interloper with regard to a particular address by analyzing the ascertained at least one signal characteristic for the multiple signals, and is adapted to counter the detected wireless interloper.

Claims

1. An apparatus comprising

at least one processor;

at least one antenna array for transceiving a plurality of communication beams;

one or more media comprising processor-executable instructions that are capable of being executed by said at least one processor, the processor-executable instructions adapted to direct the apparatus to perform steps comprising;

receiving a plurality of communication beam packets via at least one communication beam with said antenna array, each communication beam packet comprising a single source address;

monitoring at least one received-signal-characteristic, representative of propagated arrivals at a single antenna array, for a plurality of said packets that relate to a single source address; and

detecting a wireless interloper if a discrepancy is determined to exist with regard to said at least one received-signal-characteristic relating to a single source address propagated to said single antenna array of the apparatus.

2. An apparatus according to claim 1 wherein the detecting step is performed without requiring additional receiving, monitoring, detecting, or location-triangulating assistance from other apparatus nodes in a network.

3. An apparatus according to claim 1 wherein the monitoring step for a plurality of packets related to a single source address comprises:

logging and updating at least one received-signal-characteristic selected from the group comprising;

arrival delay, arrival direction, offset in arrival directions for multipath, carrier frequency offset, and direction-indexed path signal strength.

4. An apparatus according to claim 3 using a histogram to represent the quantized distribution of at least one received signal characteristic.

5. An apparatus according to claim 4 wherein the height of a histogram bin indicates the number of occurrences that a quantized received-signal-characteristic falls into that bin.

6. An apparatus according to claim 5 wherein a binned occurrence is removed when it ages beyond a preset limit.

7. An apparatus according to claim 1 wherein the detecting step further comprises:

detecting whether the distribution of one or more received-signal-characteristics monitored over a first plurality of packets is commensurate with that monitored over a second plurality of packets and whether said second plurality of packets is not identical to said first plurality of packets.

8. An apparatus according to claim 1 wherein the detecting step further comprises:

determining whether a bi-modal distribution appears, responsive to an alarm threshold, when one or more of said received-signal-characteristics are monitored over a plurality of packets.

9. An apparatus according to claim 1 wherein the processor-executable instructions are adapted to cause the apparatus to perform the further step of:

if a wireless interloper is detected in the detecting action, countering the interloper.