Wireless local area network for use in neighborhoods

• US 4,792,946 A
• Filed: 04/07/1987
• Issued: 12/20/1988
• Est. Priority Date: 04/07/1987
• Status: Expired due to Fees

• Current Assignee: Spectrum Electronics Incorporated
• Original Assignee: Spectrum Electronics Incorporated
• Inventors: Mayo, Scott T.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Chin, Wellington
• Application Number:
  US07/035,447
• Time in Patent Office: 623 Days
• Field of Search: 370/94, 370/95, 370/86, 370/85, 370/88, 455/33, 455/56, 340/825.05
• US Class Current: 370/245
• CPC Class Codes: G08B 25/009 Signalling of the alarm condition to a substation whose identity is signalled to a central station, e.g. relaying alarm signals in order to extend communication range
• CPC Class Codes: G08B 25/045 with sensing devices and central station in a closed loop, e.g. McCullough loop
• CPC Class Codes: G08B 25/10 using wireless transmission systems G08B25/009 takes precedence
• CPC Class Codes: H04L 12/42 Loop networks
• CPC Class Codes: H04W 40/02 Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 40/24 Connectivity information management, e.g. connectivity discovery or connectivity update
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A local area network for digital information transmission to and from each of a plurality of building units in an area, such as homes in a neighborhood is provided, wherein all connections between units are wireless. Each unit is provided with and fm transceiver station, which is connected with an electrical system in said unit, such as a security system or a power distribution system in such a way that information can be gathered from said system and commands delivered to said system. Each transceiver is adapted to operate at a power level and on a frequency which does not require an FCC license. Each transceiver includes programmable means adapted to cause said transceiver to recognize transmission specifically addressed to it by other stations in the network, and to cause said transceiver to generate and send transmissions specifically addressed to other transceivers in the network. Thus, the transceivers on the network are serially linked in a loop, and commands for the system in any building unit and data from any system in any building unit may be passed from unit to unit about the loop in either of two directions.

Claims

1. A local area network for digital information transmission to and from each of a plurality of building units in an area, wherein all network interconnections between any of said plurality of units and any other of said plurality of units are wireless and employ no cables, said network comprising a plurality of transceiver stations, one each being located at each of said plurality of units, each said transceiver station including:

radio transmitter means adapted to transmit information in digital form, and further adapted to selectively address said transmitted information to at least either of two proximately located other transceiver stations of said plurality, said transmitter means being operable in a frequency range and at a sufficiently low maximum power level as to be normally and lawfully utilizable without an FCC license;

radio receiver means adapted to receive transmissions of information in digital form, and further adapted to specifically recognize such transmissions selectively addressed to said receiver means from at least either two proximately located other transceiver stations of said plurality;

interface means interconnecting said transceiver means with at least one electrical system associated with said unit of said plurality where said transceiver station is located and adapted to accept data from said system and deliver commands to said system;

first means interposed between said interface means and said radio transmitter means and adapted to modulatingly convey said data from said interface means to said radio transmitter means; and

second means interposed between said first interface means and said radio receiver means and adapted to demodulatingly convey said commands from said radio receiver means to said interface means;

programmable control means adapted to cause said transmitter means to recognizably and selectively retransmit data and commands received by said receiver means in a predeterminable manner;

whereby said plurality of transceiver stations may be serially linked in a loop; and

further whereby commands for any of said systems and data from any of said systems may be passed from station to station about the loop in either of two directions.

2. A local area network as in claim 1, wherein a predetermined one of said plurality of transceiver stations is selected to act as a local control station for the network, said predetermined transceiver station further including means for generating commands addressed to any of the other transceiver stations of said plurality and means for retrievably storing data recognizably received from any of the other transceiver stations of said plurality.

3. A local area network as in claim 1, further comprising means interconnecting a remote control station with any of said transceiver stations of said plurality and adapted to transmit to said remote control station data from any of said plurality of transceiver stations and further adapted to receive from said remote control station commands addressed to any of said plurality of transceiver stations.

4. A local area network as in either of claims 2 or 3 further comprising verification means for periodically assessing the integrity of the network by ascertaining the operability of each transceiver station therein, said verifccation means including means for generating a status command addressed to a first transceiver station among the serially linked plurality of stations in the loop, means within said first station and within each other transceiver station in the network for directing said radio transmitter means therein to address said status command to the next downstream transceiver station in the loop and re-transmit said command thereto, means within said first transceiver station and within each other transceiver station for recognizing when said next downstream station fails to re-transmit said status command, means within said first transceive station and within each other transceiver station for generating a fault signal upon recognizing the failure of said next downstream station to re-transmit said status command, means within said each other transceiver station for directing said radio transmitter means therein to address said fault signal to the next upstream transceiver station in the loop and to transmit said signal thereto, and means within said first transceiver station for directing said fault signal back to said means for generating a status command, and means within said generating means for recognizing, storing, and acting upon said fault signal.

5. A local area network as in claim 4 wherein said means for generating a status command is located within said local control station, and said first transceiver station is said local control station.

6. A local area network as in claim 4 wherein said means for generating a status command is located within said remote central station, and said first transceiver station is said any of said transceiver stations associated with said remote central station via said means interconnecting.

22. A local area network as in any of claims 1, 7 or 13, wherein said receiver means further comprises means for scanning a preselected set of frequencies, said transmitter means further comprises means for transmitting on any of said set of preselected frequencies, and said programmable control means is further adapted to determine the one frequency of said preselected set of frequencies at which said transmitter means may transmit at any given point in time.

7. A local area security network for wirelessly interconnecting the individual security systems of a plurality of homes in a neighborhood and for transmission in digital form to and from each said home information concerning security system alarm conditions and other information, and network comprising a plurality of transceiver stations, one each being located at each of said plurality of homes, each said transceiver station including:

radio transmitter means adapted to transmit information in digital form, and further adapted to selectively address said transmitted information to at least either of two proximately located other transceiver stations of said plurality, said transmitter means being operable in a frequency range and at a sufficiently low maximum power level as to be normally and lawfully utilizable without an FCC license;

radio receiver means adapted to receive transmissions of information in digital form, and further adapted to specifically recognize such transmissions selectively addressed to said receiver means from at least either of two proximately located other transceiver stations of said plurality;

interface means interconnecting said transceiver means with the individual home security system associated with said home of said plurality where said transceiver station is located and adapted to recognizably accept information concerning alarm conditions from said system and deliver alarm termination commands to said system;

first means interposed between said interface means and said radio transmitter means and adapted to modulatingly convey said alarm condition information from said interface means to said radio transmitter means;

second means interposed between said interface means and said radio receiver means and adapted to demodulatingly convey said alarm termination commands from said receiver means to said interface means;

programmable control means adapted to cause said transmitter means to recognizably and selectively retransmit said alarm condition information and said alarm termination commands received by said receiver means in a predeterminable manner; and

indicator means adapted to recognizably and selectively indicate the existence of an alarm condition in the security system of any other home of said plurality;

whereby said plurality of transceiver stations may be serially linked in a loop; and

whereby alarm condition information and alarm termination commands may be passed from station to station about the loop in either of two directions; and

further whereby an alarm condition in any security system of said plurality of homes can be selectively and recognizably indicated in at least one other of said plurality of homes.

8. A local area security network as in claim 7, wherein a predetermined one of said plurality of transceiver stations is selected to act as a local control station for the security network, said predetermined transceiver station further including means for generating alarm termination commands addressed to any of the other transceiver stations of said plurality and means for retrievably storing information concerning alarm conditions recognizably received from any of the other transceiver stations of said plurality.

9. A local area security network as in claim 7, further comprising means interconnecting a remote control station with any of said transceiver stations of said plurality and adapted to transmit to said remote control station information concerning said alarm conditions from any of said plurality of transceiver stations and further adapted to receive from said remote control station alarm termination commands addressed to any of said plurality of transceiver stations.

10. A local area security network as in either of claims 8 or 9 furthrr comprising verification means for periodically assessing the integrity of the network by ascertaining the operability of each transceiver station therein, said verification means including means for generating a status command addressed to a first transceiver station among the serially linked plurality of stations in the loop, means within said first station and within each other transceiver station in the network for directing said radio transmitter means therein to address said status command to the next downstream transceiver station in the loop and re-transmit said command thereto, means within said first transceiver station and within each other transceiver station for recognizing when said next downstream station fails to re-transmit said status command, means within said first transceiver station and within each other transceiver station for generating a fault signal upon recognizing the failure of said next downstream station to re-transmit said status command, means within said each other transceiver station for directing said radio transmitter means therein to address said fault signal to the next upstream transceiver station in the loop and to transmit said signal thereto, and means within said first transceiver station for directing said fault signal back to said means for generating a status command, and means within said generating means for recognizing, storing, and acting upon said fault signal.

11. A local area security network as in claim 10 wherein said means for generating a status command is located within said local control station, and said first transceiver station is said local control station.

12. A lccal area security network as in claim 10 wherein said means for generating a status command is located within said remote control station via said means interconnecting.

13. A local area utility service network for wirelessly interconnecting the individual utility distribution systems of a plurality of homes in a neighborhood and for transmission in digital form to and from each said home information concerning utility usage and other information, said network comprising a plurality of transceiver stations, one each being located at each of said plurality of homes, each said transceiver station including:

ratio transmitter means adapted to transmit information in digital form, and further adapted to selectively address said transmitted information to at least either of two proximately located other transceiver stations of said plurality, said transmitter means being operable in a frequency range and at a sufficiently low maximum power level as to be normally and lawfully utilizable without an FCC license;

radio receiver means adapted to receive transmissions of information in digital form, and further adapted to specifically recognize such transmissions selectively addressed to said receiver means from at least either of two proximately located other transceiver stations of said plurality;

interface means nnterconnecting said transceiver means with at least one utility distribution system associated with said home of said plurality where said transceiver station is located and adapted to recognizably accept information concerning utility usage from said system and deliver appliance enabling and disenabling commands to said system;

first means interposed between said interface means and said radio transmitter means and adapted to modulatingly convey said utility usage information from said interface means to said transmitter means;

second means interposed between said interface means and said radio receiver means and adapted to demodulatingly convey said appliance enabling and disenabling commands from said receiver means to said interface means; and

programmable control means adapted to cause said transmitter means to recognizable and selectively retransmit said utility usage information and said appliance enabling and disenabling commands received by said receiver means in a predetermined manner;

whereby said plurality of transceiver stations may be serially linked in a loop; and

whereby utility usage information and appliance enabling and disenabling commands may be passed from station to station about the loop in either of two directions.

14. A local area utility service network as in claim 13, wherein a predetermined one of said plurality of transceiver stations is selected to act as a local control station for the network, said predetermined transceiver station further including means for generating appliance enabling and disenabling commands addressed to any of the other transceiver stations of said plurality and means for retrievably storing information regarding utility usage recognizably received from any of the other transceiver stations of said plurality.

15. A local area network as in claim 13, further comprising means interconnecting a remote control station with any of said transceiver stations of said plurality and adapted to transmit to said remote control station information regarding utility usage from any of said plurality of transceiver stations and further adapted to receive from said remote control station commands addressed to any of said plurality of transceiver stations.

16. A local area network as in either of claims 14 or 15 further comprising verification means for periodically assessing the integrity of the utility service network by ascertaining the operability of each transceiver station therein, said verification means including means for generating a status command addressed to a frrst transceiver station among the serially linked plurality of stations in the loop, means within said first station and within each other transceiver station in the network for directing said radio transmitter means therein to address said status command to the next downstream transceiver station in the loop and re-transmit said command thereto, means within said first transceiver station and within each other transceiver station for recognizing when said next downstream station fails to re-transmit said status command, means within said first transceiver station and within each other transceiver station for generating a fault signal upon recognizing the failure of said next downstream station to re-transmit said status command, means within said each other transceiver station for directing said radio transmitter means therein to address said fault signal to the next upstream transceiver station in the loop and to transmit said signal thereto, and means within said first transceiver station for directing said fault signal back to said means for generating a status command, and means within said generating means for recognizing, storing, and acting upon said fault signal.

17. A local area security network as in claim 16 wherein said means for generating a status command is located within said local control station, and said first transceiver station is said local control station.

18. A local area security network as in claim 16 wherein said means for generating a status command is located within said remote control station via said means interconnecting.

19. A local area network as in any of claims 3, 9 or 15, wherein said means interconnecting a remote control station with any of said transceiver stations of said plurality of further comprises a higher power, licensed, two-way radio transceiver of a predetermined frequency range and mode of modulation operatively associated with said any of said transceiver stations of said plurality.

20. A local area network as in any of claims 3, 9 or 15, wherein said means interconnecting a remote control station with any of said transceiver stations of said plurality further comprises a modem interconnected between said any of said transceiver stations of said plurality of and a telephone line associated with the building unit at which said any of said transceiver stations is located.

21. A local area network as in any of claims 3, 9 or 15, wherein said means interconnecting a remote control station with said any of said transceiver stations of said plurality of further comprises a plurality of modems, one each interconnected between each said transceiver station of said plurality of and the telephone line associated with the building unit where said transceiver station is located, and wherein said programmable control means included within said any of said transceiver stations is further adapted to transmittably and selectively command the utilization of any of said plurality of modems as said means interconnecting.

23. A local area network as in any of claims 2, 8 or 14, wherein said transceiver station selected to act as a local control station further comprises second transmitter means and second receiver means adapted to transmit and receive signals of at least one second frequency other than that utilized by said network, and further programmable control means adapted to cause said second transmitter means and said second receiver means to respectively transmit, receive and retransmit data and commands at said second frequency, whereby the local control stations of a plurality of adjacent locl area networks may be serially linked in a loop.