Source: http://www.google.nl/patents/US20060227739
Timestamp: 2018-01-17 17:41:23
Document Index: 685443073

Matched Legal Cases: ['art 1963', 'art 1981', 'art 1984', 'art 1985', 'art 1987', 'art 1990', 'art 1989', 'art 1991', 'art 1989', 'art 1987', 'art 1987', 'art 1990', 'art 1990', 'art 1993', 'art 1994', 'art 1994', 'art 1993', 'art 2002', 'art 2004']

Patent US20060227739 - Wireless personal local area network - Google Patenten
A transceiver apparatus for creating a wireless personal local area network between a computer terminal and one or more peripheral devices. A separate transceiver is connected to the computer terminal and to each peripheral device. The transceivers can be connected to the terminal or peripheral device...http://www.google.nl/patents/US20060227739?utm_source=gb-gplus-sharePatent US20060227739 - Wireless personal local area network
Publicatienummer US20060227739 A1
Aanvraagnummer US 11/419,565
Publicatiedatum 12 okt 2006
Aanvraagdatum 22 mei 2006
Prioriteitsdatum 25 mei 1990
Ook gepubliceerd als US6359872, US20030128685, US20030193905, US20040090945, US20060209777, US20060215591, US20090296677, US20090303920
Publicatienummer 11419565, 419565, US 2006/0227739 A1, US 2006/227739 A1, US 20060227739 A1, US 20060227739A1, US 2006227739 A1, US 2006227739A1, US-A1-20060227739, US-A1-2006227739, US2006/0227739A1, US2006/227739A1, US20060227739 A1, US20060227739A1, US2006227739 A1, US2006227739A1
Uitvinders Ronald Mahany, Alan Bunte, Ronald Luse, Guy West, Charles Gollnick
Oorspronkelijke patenteigenaar Mahany Ronald L, Bunte Alan G, Luse Ronald E, West Guy J, Gollnick Charles D
Patentcitaties (99), Verwijzingen naar dit patent (7), Classificaties (43), Juridische gebeurtenissen (3)
US 20060227739 A1
10. A network device for operating in a communication system that includes a main communication network and a radio network, the network device comprising:
transmit circuitry configured to transmit signals on the main network and to transmit signals on the radio network; and
receive circuitry configured to receive signals from the main network and to receive signals from the radio network;
wherein the network device is operable to serve as a master device on the radio network.
11. The network device of claim 10 wherein the transmit circuitry comprises first transmit circuitry configured to transmit signals on the main network and second transmit circuitry configured to transmit radio signals on the radio network, and wherein the receiver circuitry comprises first receive circuitry configured to receive signals from the main network and second receive circuitry configured to receive radio signals from the radio network.
12. The network device of claim 11 wherein the second transmit circuitry and the second receive circuitry are operable to serve as master devices on the radio network.
13. The network device of claim 12 wherein the second transmit circuitry and the second receive circuitry are also operable to serve as slave devices on the radio network.
14. The network device of claim 10 further comprising a processor operable to control the communications of the transmit circuitry and the receive circuitry with the radio network.
15. The network device of claim 14 wherein the processor is operable to control the communications of the transmit circuitry and the receive circuitry with the main network.
16. The network device of claim 10 wherein the network device is a mobile device.
17. The network device of claim 10 wherein the main communication network comprises a radio network.
18. The network device of claim 17 wherein the network device is operable to function as a slave device on the main communication network.
19. The network device of claim 17 wherein the main communication network has a longer range than the radio network.
20. The network device of claim 17 wherein the network device is configured to communicate with the main network according to a first communication protocol and to communicate with the radio network according to a second communication protocol independent of the first communication protocol.
21. The network device of claim 17 wherein the network device is configured to communicate with the main network using a first operating band and to communicate with the radio network using a second operating band different than the first operating band.
22. The network device of claim 10 wherein the network device is also operable to participate as a slave device on the radio network.
23. The network device of claim 10 wherein the network device is a handheld device configured to be operated while being held in a hand of a user.
24. The network device of claim 10 wherein the network device is portable.
25. The network device of claim 10, further comprising a keyboard.
26. The network device of claim 10, further comprising a graphical display.
27. The network device of claim 10 wherein the network device is operable to manage communications of a second network device participating on the radio network.
28. The network device of claim 10 wherein the network device is operable to synchronize communications of a second network device participating on the radio network.
29. The network device of claim 10 wherein the network device is operable to manage communications of a second network device, that participates on the radio network, with the main network.
30. The network device of claim 10 wherein the network device is operable to facilitate communications of a second network device, that participates on the radio network, with the main network.
31. The network device of claim 10 wherein the network device is operable to manage communications of a second network device participating on the radio network with a third network device participating on the radio network.
32. The network device of claim 10 wherein the network device is an integrated circuit.
33. The network device of claim 10 wherein the transmit circuitry is configured to transmit spread spectrum signals on the radio network and the receive circuitry is configured to receive spread spectrum signals from the radio network.
34. The network device of claim 17 wherein the transmit circuitry is configured to transmit spread spectrum signals on the main network utilizing a first spreading code and to transmit spread spectrum signals on the radio network utilizing a second spreading code and wherein the receive circuitry is configured to receive spread spectrum signals from the main network utilizing the first spreading code and to receive spread spectrum signals from the radio network utilizing a second spreading code.
35. A network device for operating in a communication system that includes a first radio network and a second radio network having a shorter range than the first radio network, the network device comprising:
wherein the network device is operable to serve as a master device on the second radio network.
36. The network device of claim 35 wherein the transmit circuitry comprises first transmit circuitry configured to transmit signals on the first network and second transmit circuitry configured to transmit signals on the second radio network, and wherein the receiver circuitry comprises first receive circuitry configured to receive signals from the first radio network and second receive circuitry configured to receive radio signals from the second radio network.
37. The network device of claim 36 wherein the second transmit circuitry and the second receive circuitry are operable to serve as master devices on the second radio network.
38. The network device of claim 37 wherein the second transmit circuitry and the second receive circuitry are also operable to serve as slave devices on the second radio network.
39. The network device of claim 35 further comprising a processor operable to control the communications of the transmit circuitry and the receive circuitry with the second radio network.
40. The network device of claim 39 wherein the processor is operable to control the communications of the transmit circuitry and the receive circuitry with the first radio network.
41. The network device of claim 35 wherein the network device is a mobile device.
42. The network device of claim 35 wherein the network device is operable to function as a slave device on the first radio network.
43. The network device of claim 35 wherein the network device is configured to communicate with the first radio network according to a first communication protocol and to communicate with the second radio network according to a second communication protocol independent of the first communication protocol.
44. The network device of claim 35 wherein the network device is configured to communicate with the first radio network using a first operating band and to communicate with the second radio network using a second operating band different than the first operating band.
45. The network device of claim 35 wherein the network device is also operable to participate as a slave device on the second radio network.
46. The network device of claim 35 wherein the network device is a handheld device configured to be operated while being held in a hand of a user.
47. The network device of claim 35 wherein the network device is portable.
48. The network device of claim 35, further comprising a keyboard.
49. The network device of claim 35, further comprising a graphical display.
50. The network device of claim 35 wherein the network device is operable to manage communications of a second network device participating on the second radio network.
51. The network device of claim 35 wherein the network device is operable to synchronize communications of a second network device participating on the second radio network.
52. The network device of claim 35 wherein the network device is operable to manage communications of a second network device, that participates on the second radio network, with the first radio network.
53. The network device of claim 35 wherein the network device is operable to facilitate communications of a second network device, that participates on the second radio network, with the first radio network.
54. The network device of claim 35 wherein the network device is operable to manage communications of a second network device participating on the second radio network with a third network device participating on the second radio network.
55. The network device of claim 35 wherein the network device is an integrated circuit.
56. The network device of claim 35 wherein the network device comprises a PCMCIA card containing the transmit circuitry and the receive circuitry.
57. The network device of claim 35 wherein the transmit circuitry is configured to transmit spread spectrum signals on the second radio network and the receive circuitry is configured to receive spread spectrum signals from the second radio network.
58. The network device of claim 35 wherein the transmit circuitry is configured to transmit spread spectrum signals on the first radio network utilizing a first spreading code and to transmit spread spectrum signals on the second radio network utilizing a second spreading code and wherein the receive circuitry is configured to receive spread spectrum signals from the first radio network utilizing the first spreading code and to receive spread spectrum signals from the second radio network utilizing a second spreading code.
59. A communication system comprising:
a first radio network;
a second radio network having a shorter range than the first network; and
a mobile network device operable to communicate with the first radio network and operable to communicate with the second radio network;
the mobile network device being operable to participate as a slave device on the first radio network and operable to participate as a master device on the second radio network.
60. The communication system of claim 59 wherein the mobile network device comprises a processor operable to control the communications of the mobile network device with the first and second radio networks.
61. The communication system of claim 59 wherein the mobile network device comprises a radio transceiver configured to communicate with both the first and second radio networks.
62. The communication system of claim 61 wherein the radio transceiver comprises a single radio unit configured to communicate with both the first and second radio networks.
63. The communication system of claim 61 wherein the radio transceiver comprises:
a second radio unit configured to communicate with the second radio network.
64. The communication system of claim 59 wherein the mobile network device is also operable to participate as a slave device on the second network.
65. The communication system of claim 59 wherein the mobile network device comprises:
a first radio transceiver configured to communicate with the first radio network; and
a second radio transceiver configured to communicate with the second radio network, the second radio transceiver being operable to serve as a master device on the second network.
66. The communication system of claim 65 wherein the mobile network device comprises a processor operable to control the communications of the second radio transceiver with the second radio network.
67. The communication system of claim 66 wherein the processor is operable to control the communications of the first radio transceiver with the first radio network.
68. The communication system of claim 65 wherein the second radio transceiver is also operable to serve as a slave device on the second network.
69. The communication system of claim 59 wherein the mobile network device comprises radio transmitter circuitry configured to transmit radio signals to the first and second radio networks and radio receiver circuitry configured to receive radio signals from the first and second radio networks.
70. The communication system of claim 69 wherein the radio transmitter circuitry comprises a first radio transmitter configured to transmit a radio signal to the first radio network and a second radio transmitter configured to transmit a radio signal to the second radio network, and wherein the radio receiver circuitry comprises a first radio receiver configured to receive a radio signal from the first radio network and a second radio receiver configured to receive a radio signal from the second radio network.
71. The communication system of claim 59 wherein the mobile network device comprises:
a first radio transmitter configured to transmit a radio signal to the first radio network;
a first radio receiver configured to receive a radio signal from the first radio network;
a second radio transmitter configured to transmit a radio signal to the second radio network; and
a second radio receiver configured to receive a radio signal from the second radio network.
72. The communication system of claim 71 wherein the second radio transmitter and the second radio receiver are operable to serve as master devices on the second network.
73. The communication system of claim 71 wherein the mobile network device comprises a processor operable to control the communications of the second transmitter and the second receiver with the second radio network.
74. The communication system of claim 73 wherein the processor is operable to control the communications of the first transmitter and the first receiver with the first radio network.
75. The communication system of claim 72 wherein the second radio transmitter and the second radio receiver are also operable to serve as a slave devices on the second network.
76. The communication system of claim 59 wherein the mobile network device is operable to participate as a slave device on the first radio network while participating as a master device on the second radio network.
77. The communication system of claim 59 wherein the mobile network device is a handheld device configured to be operated while being held in a hand of a user.
78. The communication system of claim 59 wherein the mobile network device is portable.
79. The communication system of claim 59 wherein the mobile network device comprises a keyboard.
80. The communication system of claim 59 wherein the mobile network device comprises a graphical display.
81. The communication system of claim 59 wherein the mobile network device is operable to manage communications of a second network device participating on the second radio network.
82. The communication system of claim 59 wherein the mobile network device is operable to synchronize communications of a second network device participating on the second radio network.
83. The communication system of claim 59 wherein the mobile network device is operable to manage communications of a second network device, that participates on the second radio network, with the first radio network.
84. The communication system of claim 59 wherein the mobile network device is operable to facilitate communications of a second network device, that participates on the second radio network, with the first radio network.
85. The communication system of claim 59 wherein the mobile network device is operable to manage communications of a second network device participating on the second radio network with a third network device participating on the second radio network.
86. The communication system of claim 59 wherein the first radio network operates according to a first communication protocol and the second radio network operates according to a second communication protocol independent of the first communication protocol.
87. The communication system of claim 59 wherein the first radio network employs a first operating band and the second radio network employs a second operating band different than the first operating band.
88. The communication system of claim 59 wherein the mobile network device is managed by the first radio network.
89. The communication system of claim 59 wherein the communications of the mobile network device with the first radio network are synchronized to the first radio network.
90. The communication system of claim 59 wherein access by the mobile network device to the first radio network device is managed by one or more base stations of the first radio network.
The present application is a continuation of application Ser. No. 08/959,432 filed Oct. 28, 1997, now (U.S. Pat. No. ______ issued Mar. 19, 2002), which is a continuation of U.S. application Ser. No. 08/500,977 filed Apr. 4, 1996, (now U.S. Pat. No. 5,682,379 issued Oct. 28, 1997), which is the U.S. national stage entry of PCT Application No. PCT/US93/12628 filed Dec. 23, 1993, (published as WO94/15413 on Jul. 7, 1994). The Application No. PCT/US93/12628 claims priority to U.S. application Ser. No. 08/027,140 filed Mar. 5, 1993 (now U.S. Pat. No. 5,602,854 issued Feb. 11, 1997), and Ser. No. 07/997,693 filed Dec. 23, 1992 (now abandoned). Said application Ser. No. 08/500,977 is a continuation in part of said application Ser. No. 08/027,140, which is a continuation in part of said application Ser. No. 07/997,693, which is a continuation-in-part of application Ser. No. 07/982,292 filed Nov. 27, 1992, (now abandoned)
Computer terminals and peripheral devices are now used in practically every aspect of life. Computer terminals come in all shapes and sizes and vary greatly in terms of function, power and speed. Additionally, the number of peripheral devices which can be attached to the computer terminals is increasing. Many peripheral devices exist such as printers, modems, graphics scanners, text scanners, code readers, magnetic card readers, external monitors, voice command interfaces, external storage devices, and so on.
In addition, such large scale systems are designed for long range RF communication and often required either a licensed frequency or must be operated using spread spectrum technology. Thus, these radios are typically cost prohibitive, prove too large for convenient use with personal computers and small peripheral devices, and require a great deal of transmission energy utilization
The present invention solves many of the problems inherent The mobile network device participates as a slave to the first network pursuant to the first protocol and as a master to the second network pursuant to the second protocol, and resolves conflicts between the first and second protocols in communication systems having devices which use battery power. The present invention relates generally to local area networks and, more specifically, to a communication system for maintaining connectivity between devices on networks which have different operating parameters while limiting the power drain of battery powered devices.
FIG. 1 a illustrates a warehouse environment incorporating a communication network which maintains communication connectivity between the various network devices according to the present invention.
FIG. 3 is a block diagram illustrating the functionality of RF transceivers built in accordance with the present invention. FIG. 4 is a diagrammatic illustration of an alternate embodiment of the personal microLAN shown in FIG. 2.
FIG. 1 a illustrates a warehouse environment incorporating a communication network which maintains communication connectivity between the various network devices according to the present invention. Specifically, a worker utilizes a computer terminal 7 and a code reader 9 to collect data such as identifying numbers or codes on warehoused goods, such as the box 10. As the numbers and codes are collected, they are forwarded through the network to a host computer 11 for storage and cross-referencing. In addition, the host computer 11 may, for example, forward cross-referenced information relating to the collected numbers or codes back through the network for display on the terminal 7 or for printing on a printer 13. Similarly, the collected may be printed from the computer terminal 7 directly to the printer 13. Other exemplary communication pathways supported by the present invention include messages exchanged between the computer terminal 7 and other computer terminals (not shown) or the host computer 11.
Network devices that are mobile or remote (i.e., cannot be directly connected to the backbone LAN 19) are fitted with RF transceivers. To guarantee that such a network device will be able to directly communicate with at least one of the base stations 15 and 17, the fitted transceiver is selected to yield approximately the same transmission power as do the base stations 15 and 17. However, not all mobile or remote network devices require a direct RF link to the base stations 15 and 17, and some may not require any link at all. Instead, communication is generally localized to a small area and, as such, only requires relatively lower power, short range transceivers. The devices which participate in the localized, short range communication, form what is termed herein a “microLAN”. For example, the interaction between peripheral devices such as the printer 13, modem 23, and code reader 9 with the terminal 7 provide a justification for a microLAN configuration.
As briefly described above, in any microLAN, the participating devices (“microLAN devices”) need not all possess the transceiver capability to reach the main communication network. However, at least one microLAN device needs to have that capability to maintain overall network connectivity.
Similarly, if the truck 33 is used for service purposes, the truck 33 leaves the dock in the morning with the addresses and directions of the service destinations, technical manuals, and service notes which have been selectively downloaded from the host computer via the main network and microLAN to the storage terminal 31. Upon pulling out of range of the microLAN network in the dock, the storage terminal 31 and the computer terminal 7 automatically form an independent, detached microLAN. At each service address, the driver collects information using the terminal 7 either as the data is collected if within microLAN transmission range of the storage terminal 31, or as soon as the terminal 7 comes within range. Through the detached microLAN network such information is available on the computer terminal. Upon returning to the dock, as soon as the independent microLAN formed between the storage terminal 31 and the computer terminal 7 come within microLAN range of the microLAN devices on the dock, the detached microLAN automatically merges with the dock's microLAN (becomes “attached”), and the storage terminal 31 automatically transfers the service information to the host computer 11 which uses the information for billing and in formulating the service destinations which will be automatically downloaded the next day.
In addition, if the computer terminal 7 reaches a predetermined low battery threshold level, the terminal 7 will attempt to pass the burden of providing main network access to other microLAN backup devices. If no backup device exists in the current microLAN, the computer terminal 7 may refuse all high power transmissions to the main communication network Alternatively, the computer terminal 7 may either refuse predetermined select types of requests, or prompt the operator before performing any transmission to the main network. However, the computer terminal 7 may still listen to the communications from the main communication network and inform microLAN members of waiting messages.
In particular, the transceiver 110 contains a radio unit 112 which attaches to an attached antenna 113. The radio unit 112 used in microLAN slave devices need only provide reliable low power transmissions, and are designed to conserve cost, weight and size. Potential microLAN master devices not only require the ability to communicate with microLAN slave devices, but also require higher power radios to also communicate with the main network. Thus, potential microLAN master devices and other non-microLAN slave devices might contain two radio units 112 (or two transceivers 110)—one serving the main network and the other serving the microLAN network—else only contain a single radio unit to service both networks.
In embodiments where cost and additional weight is not an issue, a dual radio unit configuration for potential microLAN master devices provides several advantages. For example, simultaneous transceiver operation is possible by choosing a different operating band for each radio. In such embodiments, a 2.4 GHz radio is included for main network communication while a 27 MHz radio supports the microLAN network. MicroLAN slave devices receive only the 27 MHz radio, while the non-potential microLAN participants from the main network are fitted with only the 2.4 GHz radios. Potential microLAN master devices receive both radios. The low power 27 MHz microLAN radio is capable of reliably transferring information at a range of approximately 40 to 100 feet asynchronously at 19.2 K BPS. An additional benefit of using the 27 MHz frequency is that it is an unlicensed frequency band. The 2.4 GHz radio provides sufficient power (up to 1 Watt) to communicate with other main network devices. Many different frequency choices could also be made such as the 900 MHz band, etc.
FIG. 5 is a block diagram illustrating a channel access algorithm used by microLAN slave devices in according to the present invention. At a block 181, when a slave device has a message to send, it waits for an idle sense message to be received from the microLAN master device at a block 183. When an idle sense message is received, the slave device executes a back-off protocol at a block 187 by in an attempt to avoid collisions with other slave devices waiting to transmit. Basically, instead of permitting every slave device from repeatedly transmitting immediately after an idle sense message is received, each waiting slave is required to first wait for a pseudo-random time period before attempting a transmission. The pseudo-random back-off time period is generated and the waiting takes place at a block 187. At a block 189, the channel is sensed to determine whether it is clear for transmission. If not, a branch is made back to the block 183 to attempt a transmission upon receipt of the next idle sense message. If the channel is still clear, at a block 191, a relatively small “request to send” type packet is transmitted indicating the desire to send a message. If no responsive “clear to send” type message is received from the master device, the slave device assumes that a collision occurred at a block 193 and branches back to the block 183 to try again. If the “clear to send” message is received, the slave device transmits the message at a block 195.
FIG. 6 a is a timing diagram of the protocol used according to the present invention illustrating a typical communication exchange between a microLAN master device having virtually unlimited power resources and a microLAN slave device. Time line 201 represents communication activity by the microLAN master device while time line 203 represents the corresponding activity by the microLAN slave device. The master periodically transmits an idle sense message 205 indicating that it is available for communication or that it has data for transmission to a slave device. Because the master has virtually unlimited power resources, it “stays awake” for the entire time period 207 between the idle sense messages 205. In other words, the master does not enter a power conserving mode during the time periods 207.
The slave device uses a binding protocol (discussed below with regard to FIG. 6 c) to synchronize to the master device so that the slave may enter a power conserving mode and still monitor the idle sense messages of the master to determine if the master requires servicing. For example, referring to FIG. 6 a, the slave device monitors an idle sense message of the master during a time period 209, determines that no servicing is required, and enters a power conserving mode during the time period 211. The slave then activates during a time period 213 to monitor the next idle sense message of the master. Again, the slave determines that no servicing is required and enters a power conserving mode during a time period 215. When the slave activates again during a time period 217 to monitor the next idle sense message, it determines from a “request to send” type message from the master that the master has data for transmission to the slave. The slave responds by sending a “clear to send” type message during the time period 217 and stays activated in order to receive transmission of the data. The master is thus able to transmit the data to the slave during a time period 219. Once the data is received by the slave at the end of the time period 221, the slave again enters a power conserving mode during a time period 223 and activates again during the time period 225 to monitor the next idle sense message.
More specifically, FIG. 8 is a block diagram which illustrates a protocol 301 used by a destination microLAN device and a corresponding protocol 303 used by a source microLAN device to adjust the data rate and possibly the power level for future transmission between the two devices. At a block 311, upon receiving a transmission from a source device, the destination device identifies a range value at a block 313. In a low cost embodiment, the range value is identified by considering the received signal strength indications (RSSI) of the incoming transmission. Although RSSI circuitry might be placed in all, microLAN radios, the added expense may require that only microLAN master devices receive the circuitry. This would mean that only microLAN master devices would perform the function of the destination device. Other ranging values might also be calculated using more expensive techniques such as adding GPS (Global Position Service) circuitry to both radios. In such an embodiment, the range value transmitted at the block 313 would consist of the GPS position of the destination microLAN device. Finally, after identifying the range value at the block 313, the destination device subsequently transmits the range value to the slave device from which the transmission was received.
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Internationale classificatie H04L1/00, H04L29/06, H04B7/005, H04L12/28, H04W64/00, H04W92/02, H04W74/08, H04W88/06, H04W84/18, H04W88/10
Coöperatieve classificatie H04L69/18, H04L1/0032, H04W52/367, H04W52/287, G08C2201/20, H04W88/10, H04W28/10, H04W84/10, H04W48/18, H04L1/0002, H04W64/00, H04W52/267, H04W84/12, H04W84/18, H04W74/0808, H04W74/08, H04W52/343, H04W88/06, H04W92/02, H04L1/0025, H04W52/346, H04W88/16, H04W52/50
Europese classificatie H04L1/00A9N, H04W64/00, H04L1/00A1M, H04L1/00A9A, H04L1/00A1, H04W88/16, H04W88/06, H04W52/34L, H04W92/02