Wireless local area network receiver and associated method

• US 9,699,680 B2
• Filed: 06/27/2014
• Issued: 07/04/2017
• Est. Priority Date: 03/31/2006
• Status: Active Grant

• Current Assignee: Zebra Technologies Corporation
• Original Assignee: ZIH Corp. (Zebra Technologies Corporation)
• Inventors: Wisherd, David S.
• Primary Examiner(s): NGO, RICKY QUOC
• Assistant Examiner(s): Samuel, Dewanda
• Application Number:
  US14/318,237
• Publication Number:
  US 20150117422A1
• Time in Patent Office: 1,103 Days
• Field of Search: 370339, 370501, 370492
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A wireless local area network (WLAN) includes a server and receiver, which includes a radio frequency (RF) front-end circuit that receives wireless signals from the mobile nodes within the WLAN and detects baseband signals. A signal waveform detector edge detects a signal waveform and generates a trigger signal indicative of the modulation type, data format and time-of-arrival (TOA) information of a desired signal to be captured. A baseband processor receives the trigger signal from the signal waveform detector and captures the desired signal. A system controller is connected to the baseband processor and configures the baseband processor for processing the desired signal and obtaining message data and signal metrics that are transferred to the system controller to be communicated outbound from the receiver as a client to the server.

Claims

1. A wireless local area network comprising:

a server;

a real time location system receiver including a radio frequency front-end circuit to receive wireless signals from mobile nodes of the wireless local area network;

a first processor configured to process the received signals and to obtain message data and signal metrics including time-of-arrival information;

a wireless local area network access point comprising a second processor and circuitry configured to;

provide connections to the wireless local area network for a plurality of wireless devices; and

send the message data and the signal metrics to the server; and

a switch coupled to the real time location receiver, the wireless local area network access point, and a plurality of antennas, the switch configured to select one of the real time location system receiver and the wireless local area network access point for a radio frequency transmission.

2. The wireless local area network of claim 1 wherein the real time location system receiver receives signals in at least a first frequency band and the wireless local area network access point receives signals in a second frequency band.

3. The wireless local area network of claim 1 further comprising a time-of-arrival processor that generates a time stamp for the received signal.

4. The wireless local area network of claim 3 wherein the time-of-arrival processor is configured to:

process time-of-arrival information when the real time location system receiver is implemented in a group of networked nodes;

determine first-to-arrive signals based on a common network timing signal; and

perform differentiation of the first-to-arrive signals to locate a desired wireless node.

5. The wireless local area network of claim 1 wherein the real time location system receiver comprises an active antenna system of the wireless local area network access point.

6. The wireless local area network of claim 4 wherein the wireless local area network access point is configured with the active antenna system.

7. An apparatus in a wireless local area network, comprising:

a real time location system receiver;

a wireless local area network access point; and

a switch coupled to the real time location system receiver, the wireless local area network access point, and a plurality of antennas, the switch configured to select one of the real time location system receiver and the wireless local area network access point for a radio frequency transmission;

the real time location system receiver comprising;

a radio frequency front-end circuit to receive wireless signals from mobile nodes within the wireless local area network; and

a first processor configured to process the received signals and to obtain message data and signal metrics including time-of arrival in formation;

the wireless local area network access point comprising a second processor and circuitry configured to;

provide connections to the wireless local area network for a plurality of wireless devices; and

send the message data and signal metrics to a server.

8. The apparatus of claim 7 wherein the real time location system receiver receives signals in at least a first frequency band and the wireless local area network access point receives signals in a second frequency band.

9. The apparatus of claim 7 further comprising a time-of-arrival processor configured to generate a time stamp for the received signal.

10. The apparatus of claim 7 wherein said time-of-arrival processor is configured to:

process time-of-arrival information when the apparatus is implemented in a group of networked nodes;

determine first-to-arrive signals based on a common network timing signal; and

perform differentiation of the first-to-arrive signals to locate a desired wireless node.

11. The apparatus of claim 7 wherein the real time location system receiver comprises an active antenna system of the wireless local area network access point.

12. The apparatus of claim 11 wherein the active antenna system is configured in place of a passive antenna.

13. A method of communicating within a wireless local area network, the method comprising:

receiving, at a real time location system receiver, wireless signals transmitted from mobile nodes within the wireless local area network;

processing, by a processor of the real time location system receiver, the received signals to obtain message data and signal metrics, the message data and signal metrics including time-of-arrival information; and

transmitting, by a wireless local area network access point, the message data and signal metrics to a server in the wireless local area network;

wherein the real time location system receiver and wireless local area network access point are comprised in a same device, and the real time location system receiver and the wireless local area network access point are each coupled to a switch of the device, the switch configured to select one of the real time location system receiver and the wireless local area network access point for a radio frequency transmission.

14. The method of claim 13 wherein signals are received in multiple frequency bands and the real time location system receiver receives signals in at least a first frequency band and the wireless local area network access point receives signals in a second frequency band.

15. The method of claim 13 further comprising generating a time stamp for the received signal.

16. The method of claim 15 further comprises processing time-of-arrival information and determining a first-to-arrive signal based on a common timing signal and performing differentiation of the first-to-arrive signals to locate a desired wireless node.

17. The method of claim 13 wherein the real time location system receiver comprises an active antenna system of the wireless local area network access point.

18. The method of to claim 17 wherein the active antenna system is configured in place of a passive antenna.