Power line communication-based local hotspot with wireless power control capability

• US 9,736,789 B2
• Filed: 12/21/2012
• Issued: 08/15/2017
• Est. Priority Date: 02/22/2011
• Status: Expired due to Fees

• Current Assignee: Asoka USA Corporation (Asoka)
• Original Assignee: Asoka USA Corporation (Asoka)
• Inventors: Xia, Mingyao, Grubel, Eric, Castellano, Dan
• Primary Examiner(s): Phan, Hai
• Assistant Examiner(s): Yu, Royit
• Application Number:
  US13/725,144
• Publication Number:
  US 20130182588A1
• Time in Patent Office: 1,698 Days
• Field of Search: 340 737, 455 634, 455101, 455423-424, 455446-448, 455456, 370254, 370338, 370464
• CPC Class Codes: G01D 2204/12 Determination or prediction of behaviour, e.g. likely power consumption or unusual usage patterns
• CPC Class Codes: H02J 13/00002 characterised by monitoring
• CPC Class Codes: H02J 13/00009 using pulsed signals
• CPC Class Codes: H02J 13/00012 using an auxiliary transmission line
• CPC Class Codes: H02J 13/00028 involving the use of Internet protocols
• CPC Class Codes: H04W 52/245 taking into account received signal strength
• CPC Class Codes: Y02B 90/20 Smart grids as enabling technology in buildings sector smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/30 State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge
• CPC Class Codes: Y04S 20/30 Smart metering, e.g. specially adapted for remote reading
• CPC Class Codes: Y04S 40/121 using the power network as support for the transmission

Abstract

A method and a system for providing wireless communication facility with low interference between multiple wireless devices providing hotspot wireless coverage within a local area of an integrated enterprise or integrated home environment is disclosed. The sensor devices implementing hotspots are connected to a local area network (LAN) based on power line communication (PLC) and enabled with wireless power output control capability, allowing the coverage of area of each sensor device to be adjusted. The power output control is by a switch which allows the power output to be increased and decreased depending on coverage required and the output of the nearest hotspot. The power output level is indicated on the sensor by LEDs to enable resetting and adjustment. The use of power control and elimination of coverage overlap allow multiple hotspots to be used for achieving good connectivity while reducing interferences and noise within hotspots during connection and use.

Claims

1. A wireless hotspot sensor system comprising:

a plurality of wireless hotspot sensors distributed over an area corresponding to a local area network (LAN);

wherein each of the wireless hotspot sensors is enabled to transmit a radio frequency output signal in at least an axial direction outward from the corresponding wireless hotspot sensor, wherein the corresponding radio frequency output signal has a directional power lobe defined in the axial direction, wherein the directional power lobe has an adjustable radio frequency output power level;

wherein each of the wireless hotspot sensors includes a switch for adjusting the radio frequency output power level of the corresponding directional power lobe, and a power level indicator for monitoring the radio frequency output power level of the corresponding directional power lobe;

wherein each of the wireless hotspot sensors are interconnected using a power line communication (PLC) network within the LAN;

wherein the wireless hotspot sensors are spatially separated from each other, and are enabled to simultaneously transmit a common output signal over a common radio frequency spectrum to provide wireless coverage in the LAN;

wherein each of the wireless hotspot sensors is enabled to adjust the corresponding radio frequency output power level responsive to activation of the corresponding switch;

wherein each of the wireless hotspot sensors is further configured to indicate the current corresponding radio frequency output power level through the corresponding power level indicator; and

wherein the radio frequency output power level of each of the wireless hotspot sensors is enabled to provide effective wireless area coverage within the LAN while eliminating or reducing wireless interference and fading due to a first directional power lobe of a first wireless hotspot sensor of the wireless hotspot sensors interfering with a second directional power lobe of a second wireless hotspot sensor of the wireless hotspot sensors, transmitting on the same radio frequency on the LAN.

2. The wireless hotspot sensor system of claim 1, wherein:

the first wireless hotspot sensor is adjusted to transmit at a first radio frequency power level;

the second wireless hotspot sensor is adjusted to transmit at a second radio frequency output power level; and

the first radio frequency power level is different from the second radio frequency output power level.

3. The wireless hotspot sensor system of claim 2,

wherein the first directional power lobe and the second directional power lobe overlap when operated at a maximum power level;

and

wherein the first radio frequency output power level and the second radio frequency output power level are adjusted to values that reduce an overlap of the first directional power lobe and the second directional power lobe.

4. The wireless hotspot sensor system of claim 3, wherein the first and second wireless hotspot sensors are located in adjacent rooms.

5. The wireless hotspot sensor system of claim 1, wherein the plurality of wireless hotspot sensors are adjusted to improve area coverage within the LAN.

6. The wireless hotspot sensor system of claim 1, wherein the wireless hotspot sensors are configured to provide any of communication or streaming of media through the PLC.

7. The wireless hotspot sensor system of claim 1, wherein the switch on each wireless hotspot sensor is a toggle switch, which when pressed, advances the power level by one power level setting.

8. The wireless hotspot sensor system of claim 1, wherein the power level indicator on each wireless hotspot sensor comprises a plurality of LED'"'"'s, each LED of the plurality of LED'"'"'s having an “

on”

or “

off”

state; and

wherein the radio frequency power level is indicated based on the combination of states of the plurality of LED'"'"'s.

9. A method comprising:

distributing a plurality of wireless hotspot sensors over an area corresponding to a wireless local area network (LAN), wherein each of the wireless hotspot sensors is enabled to transmit a radio frequency output signal, in at least an axial direction outward from the corresponding wireless hotspot sensor, wherein the corresponding radio frequency output signal has a directional power lobe defined in the axial direction, wherein the directional power lobe has an adjustable radio frequency output power level, wherein each of the wireless hotspot sensors includes a switch for adjusting a radio frequency output power level of the corresponding directional power lobe, and a power level indicator for monitoring the radio frequency output power level of the corresponding directional power lobe, wherein the wireless hotspot sensors are spatially separated from each other;

interconnecting each of the wireless hotspot sensors using a power line communication (PLC) network within the LAN;

simultaneously transmitting a common radio frequency output signal from each of the wireless hotspot sensors over a common radio frequency spectrum to provide wireless coverage within the LAN; and

for each of the wireless hotspot sensors, activating the corresponding switch to adjust the radio frequency output power level of the transmitted radio frequency output signal, wherein the current transmitted radio frequency output power level is indicated by the corresponding power level indicator, to provide effective wireless area coverage within the LAN while eliminating or reducing wireless interference and fading due to a first directional power lobe of a first wireless hotspot sensor of the wireless hotspot sensors interfering with a second directional power lobe of a second wireless hotspot sensor of the wireless hotspot sensors, transmitting on the same radio frequency on the LAN.

10. The method of claim 9, wherein adjusting the radio frequency output power level of the corresponding directional power lobe of each corresponding wireless hotspot sensor comprises:

if the corresponding wireless hotspot sensor is in an “

off”

state, setting the radio frequency output power level of the corresponding directional power lobe to a lowest power setting;

determining whether or not coverage is adequate;

determining whether or not there are problem areas of fading or interference; and

responsive to determining that coverage is adequate, leaving the radio frequency output power level at the current level.

11. The method of claim 10, wherein determining whether or not coverage is adequate comprises:

selecting a plurality of locations within the wireless LAN area where coverage is required; and

for each location of the plurality of locations determining whether a received output signal generated by the corresponding wireless hotspot sensor is sufficient to enable data transactions to succeed;

wherein determining whether the received output signal is sufficient to enable data transactions to succeed comprises using a wireless transmitter-receiver to perform any of;

attempting to perform a data transaction, and responsive to the data transaction succeeding, determining that the coverage at said each location is adequate;

or

measuring signal strength of the received signal, comparing the output signal strength against a signal strength threshold, and responsive to determining that the signal strength is above the signal strength threshold, determining that the coverage at said each location is adequate.

12. The method of claim 10, wherein adjusting the radio frequency output power level of the corresponding directional power lobe of each corresponding wireless hotspot sensor further comprises:

responsive to determining that coverage is not adequate and that there are no problem areas of fading or interference, increasing the output power level for each wireless hotspot sensor.

13. The method of claim 12, wherein adjusting the radio frequency output power level of the corresponding directional power lobe of each corresponding wireless hotspot sensor further comprises:

determining whether or not increasing the output power level has resulted in areas of interference or fading; and

responsive to determining that increasing the transmitted radio frequency power level has resulted in areas of interference or fading, decreasing the transmitted radio frequency output power level to a previous level.

14. The method of claim 12, wherein adjusting the transmitted radio frequency output power level of the corresponding directional power lobe of each wireless hotspot sensor further comprises:

determining whether or not the increasing the transmitted radio frequency output power level has resulted in areas of interference or fading;

responsive to determining that increasing the transmitted radio frequency output power level has not resulted in areas of interference or fading;

further determining whether or not the transmitted radio frequency output power level has reached the highest power level;

responsive to determining that the transmitted radio frequency output power level has reached the highest power level, leaving the transmitted radio frequency output power level at the highest power level; and

responsive to determining that the transmitted radio frequency output power level has not reached the highest power level, repeating the method of claim 10 with the current power level.

15. The method of claim 9, wherein the wireless hotspot sensors provide connectivity for any of communication or streaming of media through the PLC.

16. A method comprising:

distributing a plurality of wireless hotspot sensors over an area corresponding to a wireless local area network (LAN), wherein each of the wireless hotspot sensors is enabled to transmit a radio frequency output signal in at least an axial direction outward from the corresponding wireless hotspot sensor, wherein the corresponding radio frequency output signal has a directional power lobe defined in the axial direction, wherein the directional power lobe has an adjustable radio frequency output power level, wherein each of the wireless hotspot sensors includes a switch for adjusting a radio frequency output power level for the corresponding directional power lobe, and a power level indicator for monitoring the radio frequency output power level of the corresponding directional power lobe, wherein each of the wireless hotspot sensors are spatially separated from each other;

interconnecting each of the wireless hotspot sensors using a power line communication (PLC) network within the wireless LAN;

simultaneously transmitting a common radio frequency output signal from each of the wireless hotspot sensors over a common radio frequency spectrum to provide wireless coverage within the wireless LAN;

obtaining a first set of data including locations within the wireless LAN of fading and interference of a first directional power lobe generated by a particular wireless hotspot sensor in the presence of adjacent wireless hotspot sensors that are simultaneously transmitting on the common radio frequency;

based on the first set of data, using the switch on the particular wireless hotspot sensor to adjust the radio frequency output power level of the corresponding transmitted output signal;

obtaining a subsequent set of data including locations within the wireless LAN of fading and interference of a second directional power lobe generated by the particular wireless hotspot sensor after the adjustment is made;

based on the second set of data, using the switch on the particular wireless hotspot sensor to adjust the radio frequency output power level of the corresponding transmitted output signal; and

repeating the method for each of the other wireless hotspot sensors to provide effective wireless area coverage within the wireless LAN while eliminating or reducing wireless interference and fading due to the first directional power lobe interfering with the second directional power lobe, on the common radio frequency on the wireless LAN.

17. The method of claim 16 wherein the wireless hotspot sensors receive power and data through the PLC.

18. The method of claim 16 wherein the locations within the wireless LAN area of fading and interference is determined by:

selecting a plurality of locations within the wireless LAN area where coverage is required;

for each location of the plurality of locations determining whether a radio frequency output signal generated by the corresponding wireless hotspot sensor is sufficient to enable data transactions to succeed;

wherein determining whether a radio frequency output signal is sufficient to enable data transactions to succeed comprises using a wireless transmitter-receiver to perform at least one of;

attempting to perform a pre-determined data transaction, and responsive to the data transaction failing, determining that said each location is a location of fading and interference;

or

measuring a signal strength of a received output signal, comparing the output signal strength against a pre-determined threshold, and responsive to determining that the signal strength is below the pre-determined threshold, determining that said each location is a location of fading and interference.