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`UNITED STATES DEPARTMENT OF COMMERCE
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`United States Patent and Trademark Office
`
`February 22, 2001 '
`
`THIS IS TO CERTIFY THAT ANNEXED HERETO IS A TRUE COPY FROM
`
`THE RECORDS OF THE UNITED STATES PATENT AND TRADEMARK
`
`OFFICE OF THOSE PAPERS OF THE BELOW IDENTIFIED PATENT
`
`APPLICATION THAT MET THE REQUIREMENTS TO BE GRANTED A
`FILING DATE UNDER 35 USC 111.
`
`APPLICATION NUMBER: 09/541,529
`
`FILING DATE: April 03, 2000
`
`PRIORITY DOCUMENT
`SUBMITTED OR TRANSMITTED IN
`COMPLIANCE WITH
`RULE 17.1(a) OR (13)
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`”EQJM'EQDW’EEESE: Emmg Emma
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`UNITED STATES DEPARTMENT OF COMMERCE
`
`United States Patent and Trademark Office
`
`February 22, 2001 '
`
`THIS IS TO CERTIFY THAT ANNEXED HERETO IS A TRUE COPY FROM
`
`THE RECORDS OF THE UNITED STATES PATENT AND TRADEMARK
`
`OFFICE OF THOSE PAPERS OF THE BELOW IDENTIFIED PATENT
`
`APPLICATION THAT MET THE REQUIREMENTS TO BE GRANTED A
`FILING DATE UNDER 35 USC 111.
`
`APPLICATION NUMBER: 09/541,529
`
`FILING DATE: April 03, 2000
`
`PRIORITY DOCUMENT
`SUBMITTED OR TRANSMITTED IN
`COMPLIANCE WITH
`RULE 17.1(a) OR (13)
`
`.
`
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`~ LIE/COMMISSIONER 0F PATENTS AND TRADEMARKS
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`E. BURNETT
`
`Certifying Officer
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`"PATENT APPLICATION
`DOCKET NO. 1000-0188
`
`IN THE UNITED STATES PATENT AND TRADEMARK OFFICE
`
`93
`
`Box PATENT APPLICATION
`Assistant Commissioner for Patents
`Washington, DC. 20231
`
`
` Date ochposit ............ April 3, 2000 .
`"EXPRESS MAIL" Mailing Label Ne..... H142104548US ...........
`
`.................
`
`Sir:
`
`TRANSMITTAL LETTER
`
`Transmitted herewith for filing is the patent application of
`
`Inventor(s):
`
`LaurentMarchand
`
`For:
`
`AD-HOC NETWORK AND GATEWAY
`
`Enclosed are:
`
`
`
`Thirty-two (321 pages of Patent Specification and C1aim(s).
`
`
`
`
`
`
`
`HEM Form PTO—1595 and an assignment of the invention to Telefonaktiebolaget LM Ericsson
` A check in the amount of $990.00 to cover the filing fee.
`DREW An Information Disclosure Citation (Form PTO-1449) with
`
`Three (3) sheets of drawings.
`
`31911131).
`
`A check in the amount of $M to cover the assignment recordation fee.
`
`A Combined Declaration and Power of Attorney.
`
`cited references.
`
`2
`
`
`
`The filing fee has been calculated as shown below:
`
`(Col. 2)
`(Col. 1)
`,
`
`FOR: NO. EXTRA NO. FILED
`
`
`PATENT APPLICATION
`DOCKET NO. 1000—0188
`
`SMALL ENTITY‘
`
`OTHER THAN A
`
`SMALL ENTITY
`
`
`$690
`$ 690
`XXXXUX
`memo:
`28 - 20 =
`
`
`__
`
`x 18=
`
`BASIC FEE
`TOTAL CLAIMS
`
`5 - 3 =
`
`$ 144
`
` INDBP CLAIMS
`
`
`
`* Ifthe difference in Col. 1 is less than zero, enter "0" in C01. 2.
`
`i: Please charge my Deposit Account No.
`fee. A duplicate copy of this sheet is enclosed.
`
`in the amount of $
`
`for the filing
`
`The Commissioner is hereby authorized to charge payment of the following fees associated
`with this communication or credit any overpayment to Deposit Account No. 03-1130 . A
`duplicate copy of this sheet is enclosed.
`
`Any additional filing fees required under 37 CFR 1.16.
`
`Any patent application processing fees under 37 CFR 1.17.
`
`The Commissioner is hereby authorized to charge payment of the following fees during the
`pendency of this application or credit any oveipayment to Deposit Account No. 03—11301
`A duplicate copy of this sheet is enclosed.
`
`Any patent application processing fees under 37 CFR 1.17.
`
`|:I The issue fee set in 37 CFR 1.18 at or before mailing of the Notice of Allowance,
`pursuant to 37 CFR1.311(b).
`
`3
`
`
`
`PATENT APPiICATION
`DOCKET NO. 1000-0188
`
`/
`
`Any filing fees under 37 CFR 1.16 for presentation of extra claims.
`
`Respectfully submitted,
`
`Dated:_/fl’£’_b__3.,_£9£°_.___ M
`Steven W. Smith
`
`Reg. No. 36,684
`
`SMITH & DANAMRAJ, RC.
`12900 Preston Road, Suite 1200, LB-15
`Dallas, Texas 75230-1328
`(972) 720-1202, ext. 228
`
`
`
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`4
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`PATENT APPLICATION
`DOCKET NO. 1000-0188
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`'EXPRESS MAIL" Mfil'mglabel No..... EIl42104548US ..........
`
`Date ofDepoIiI ....... Agni 3. 2000 ...........................
`
`AD—HOC NETWORK AND GATEWAY
`
`
`
`
`BACKGROUND OF THE INVENTION
`
`Technical Field of the Invention
`This invention relates to telecommunication systems and, more
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`particularly, to an ad-hoc network and a gateway that provides an interface
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`between external wireless IP networks and devices in the ad-hoc network.
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`Description ofRelated Art
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`Around the world, people are connecting more than ever. Cellular
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`phones, personal digital assistants (PDAs), and Intemet-enabled computers
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`are commonplace in both businesses and homes. Even where a formal
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`network is not recognized, users want their devices to communicate, and
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`they want easy access to the services made possible by network
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`technology. For example, there are networks in the home connecting
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`audio/visual equipment such as televisions and stereo equipment to home
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`office computers. There are also devices to control networks such as
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`security surveillance systems and temperature-control thermostats.
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`A problem arises in today's’ environment because traditional
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`networks are much too complex to set up, expand, and manage. For
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`example, adding hardware or software to an office environment usually
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`requires a network administrator to load drivers and configure systems.
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`Even in a home environment, connecting all of the components of a home
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`entertainment system can be a daunting task for the average consumer.
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`Networks today are also too brittle and inflexible. 'A slight change in a
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`network can cause havoc that can be extremely difficult to fix. From the
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`consumer‘s perspective, what is needed is a simple way to connect digital
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`devices into impromptu, expandable networks for immediate access to a
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`wide variety of services.
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`New technologies are being developed to make it easier to network
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`multiple devices. Bluetooth, for example, is a wireless communication
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`technology for data and voice. It is based on a low-cost short-range radio
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`link that operates in the unlicensed ISM band at 2.4 GHz. Bluetooth is a
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`layer 1 (physical layer) and layer 2 (data link layer) technology that allows
`one universal short-range radio linkto replace manyproprietary cables that
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`are currentlyrequired to connect one device to another. The physical layer
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`provides transmission of signals and the activation and deactivation of
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`physical connections, while the data link layer may include signal
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`. synchronization, error correction, sequencing, and flow control. This layer
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`may also provide a data transmission link across one or seVeral physical
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`connections. Bluetooth, however, does not have any knowledge of the
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`upper level network, transport, session, or application layers.
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`The Bluetooth wireless technology allows users to make effortless,
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`wireless, and instant connections between various communication devices
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`such as mobile phones and desktop and laptop computers. Transfer of
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`both voice and data is real-time, and the transmission mode provides
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`security of data and protection from interference. A small chipset is
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`utilized to implement Bluetooth radio technology in a communican'on
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`device. Two power levels are provided, a lower power level that is
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`sufl'icient to cover the area within a single room, and a higher power level
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`that can cover a medium range such as within a home. Each chipset
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`includes software controls and identity coding that ensure that only those
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`devices preset by the user can communicate over the radio link.
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`A Piconet consists of a collection of devices connected via
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`Bluetooth technology in an ad-hoc fashion. A Piconet may comprise as
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`few as two connected devices, such as a computer and a printer, and may
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`comprise as many as eight connected devices (a “master” device and
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`. seven “slave” devices). Both point-to-point and point-to-multipoint
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`connections are supported. When first establishing a Piconet, one device
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`acts as a master and the other devices act as slaves for the duration of the
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`Piconet network establishment. Thereafter, the devices behave as peer
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`units. All devices in the same Piconet have priority synchronization, but
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`other devices 'can be set to enter at any time. Multiple independent and
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`non-synchronized Piconets form a Scatternet.
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`A JINI system is a Java‘technology-centered, distributed software
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`system designed for simplicity, flexibility, and federation. The .TJNI
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`architecture provides mechanisms for machines or programs to enter into
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`a federation where each machine or program offers resources to other
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`members of the federation and uses resources as needed. The design of
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`the DN1 architecture exploits the ability to move Java programming
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`language code fi‘om machine to machine, and it unifies, under the notion
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`of a service, the user, the sofiware, and the hardware components of the
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`machines themselves.
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`JINI connection technology simplifies the processes ofestablishing,
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`configuring, and controlling a network. From the user‘s perspective, JINT
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`technology makes connecting to new levels of services as simple as
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`turning on a light switch.
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`From the traditional service provider's
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`perspective, JlNI connection software simplifies delivery and management
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`of services. When a PC connects to aLocal Area Network (LAN), for
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`example, it uses an IP multicast mechanism to find a server. The server
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`then assigns an IP address to the PC and provides the address of a IlNI
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`Lookup Service (LUS). The LUS contains a list of available services
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`provided by other devices on the network. The LUS is also used by the
`PC to publish the services that it can provide to other devices on the
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`network.’ Services are invoked by transferring a small amount of code
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`written, for example, in Java code. Devices announce not only value-
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`added services, but also their attributes and capabilities to the network.
`JINI technology “communities” are resilient, and adapt very quickly to
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`changes as users come and go.
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`The Session Initiation Protocol (SIP) is an application-layer control
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`protocol that can establish, modify, and terminate sessions or calls. These
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`multimedia sessions include multimedia conferences, distance learning,
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`Internet telephony, and similar applications. H. 323 is another call control
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`protocol for IP telephony defined by the International Telecommunications
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`Union (ITU).
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`Utilizing existing technologies, the following scenario can be
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`realized. A user creates an ad hoc network based on Bluetooth technology
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`(i.e., a Bluetooth Piconet). There are three Bluetooth devices in the
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`Piconet: a third generation Internet Protocol (3G IP) mobile telephone, a
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`Personal Digital Assistant (PDA), and a multimedia laptop computer. The
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`mobile phone is the master unit, and the PDA and laptop are slaves to the
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`mobile phone. Neither the PDA nor the laptop have a cellular radio
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`modem or call control client software (H.323 or SIP) installed. Thus,
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`neither the PDA nor the laptop know anything about the cellular IP
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`network. Therefore, a problem arises when the user wants to establish a
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`video call from his laptop.
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`Today, the only way to solve this problem is to insure that each
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`device contains ;a cellular radio modem, a Bluetooth chipset, and a call
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`control client. Bluetooth radio units and baseband are very inexpensive
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`when compared to cellular radio modems.
`Consequently,
`it
`is
`inappropriate, expensive, and cumbersome to install a cellular radio
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`modern in every device in the Bluetooth Piconet. Furthermore, loading the
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`right call control mechanism (H.323 or SIP client) into a PDA or laptop,
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`requires the user to have a higher level of technical knowledge regarding
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`the characteristics of the 3G wireless Internet network.
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`Additionally, it is inefficient from the resource point of view to
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`require loading a call control client such as H.323 (about 4 MB) in
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`multiple devices on the Piconet. Moreover, even if every device had its
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`own cellular radio modem and call control client, the IP address scheme
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`in the Piconet will certainly be different than the addressing scheme as
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`currently used in wireless IP networks such as the General Packet Radio
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`Service (GPRS).
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`There are no known prior art teachings of a solution to the
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`deficiencies and shortcomings discussed above.
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`It would be
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`advantageous, therefore, to have an ad-hoe network that can be efficiently,
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`easily, and inexpensively established for a plurality of devices, and a
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`gateway that provides access through the ad-hoc network to external
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`wireless IP networks. The present invention provides such a network and
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`gateway.
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`SUMMARY OF THE JNVENTION
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`In one aspect, the present invention is a gateway for an ad—hoc
`
`network that provides a call-control interface between an external wireless
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`Internet Protocol (11’) network and devices in the ad—hoc network. The
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`gateway includes a first interface toward the ad—hoc network that
`establishes the gateway as a call-control server for client devices in the ad-
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`hoc network, and a second interface toward the wireless 1? network that
`
`establishes the gateway as a call-control client for a server in the wireless
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`IP network. The ad-hoc network may be a Bluetooth Piconet, and the
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`gateway is preferably implemented in a mobile phone. The first interface
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`may include a private IP address recognized in the Piconet while the
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`second interface may include a public I? address recognized in the
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`wireless IP network.
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`In another aspect, the present invention is a Bluetooth Piconet
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`comprising a plurality of devices having Bluetooth chipsets, the devices
`
`being linked by a wireless 1? network based on Bluetooth technology.
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`The Piconet also includes a IINI Lookup Service (LUS) for making
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`services available to the plurality of devices in the Piconet, and a gateway
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`which may be implemented in a mObfle phone that provides a call-control
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`interface between an external wireless IP network and the devices in the
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`Piconet.
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`In another aspect, the present invention is an integrated network
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`comprising a wireless IP network and a Bluetooth Piconet. The wireless
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`IP network includes a call-control server and a Home Subscriber Server
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`(HS 3) that stores location information for mobile subscribers, and stores
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`bearer capabilities and application capabilities for IP devices registered
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`with the network. The Bluetooth Piconet includes a plurality of devices
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`having Bluetooth chipsets that are linked by a Bluetooth radio link. The
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`Piconet also includes a JlNi LUS for maldng services available to the
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`plurality of devices in the Piconet, and a gateway that provides a call-
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`control interfacc between the wireless [P netwm'k and the devices in the
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`Piconet.
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`BRIEF DESCRIPTION OF THE DRAWDIGS
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`The invention will be better understood and its numerous objects
`
`and advantages will become more apparent to those skilled in the art by
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`reference to the following dram’ngs, in conjunction with the accompanying
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`Specification, in which:
`
`FIG. 1 (Prior Art) is an illustrative drawing ofan existing Bluetooth
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`ad—hoc network;
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`FIG. 2 is an illustrative drawing "illustrating a protocol stack for a
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`Bluetooth Piconet that has been extended into an IP wireless LAN
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`implementing JlNl and Java technologies in accordance with the teachings
`
`of the present invention;
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`FIG. 3 is an illustrative drawing of an ad—hoc network utilizing
`
`Bluetooth, IP, and JINI technologies in accordance with the teachings of
`
`the present invention to enable the use of a gateway mobile phone; and
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`FIG. 4 is a simplified functional block diagram of a connection
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`between a laptop computer and a mobile phone utilizing the ad-hoc
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`network of FIG. 3.
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`DETAILED DESCRIPTION OF EMBODIMENTS
`
`The present invention relies on several technologies. First, a
`
`wireless IP network is established between devices utilizing Bluetooth
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`technology. Then, JlNI (Java) technology is utilized to publish and share
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`services between the devices, and to establish a client/server relationship
`
`between the devices and one ofthe devices having a cellular radio modem
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`and a call control client. Finally SIP and/or H.323 are utilized to
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`implement the call control client. The use of SIP is preferred, but the
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`invention may utilize H.323 technology as well.
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`FIG. 1 is an illustrative drawing of an existing Bluetooth ad-hoc
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`network 10. A laptop computer 11, a printer 12, and an office telephone
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`PATENT APPLICATION
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`13 are each equipped with a Bluetooth chipset that enables them to
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`communicate over the Bluetooth radio link 14. The office phone must
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`contain an H.323 or SIP client connected via Asychronous Digital
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`Subscriber Line (ADSL) or cable modem.
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`FIG. 2 is an illustrative drawing illustrating a protocol stack for a
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`Bluetooth Piconet that has been extended into an IP wireless LAN
`implementing Jll‘iI andJavatechnologies in accordance withthe teachings
`
`of the present invention. The layers include a physical layer 15 and a link
`
`layer 16 which, together, are provided in the present invention by the
`
`Bluetooth Piconet. On tap of that, a network transport layer 17 is
`
`implemented using the Internet Protocol (IP). After an operating system
`
`layer 18, a Java technology layer 19 and a JINI technology layer 20
`
`implement the JlNI technology providing the capability for an application
`
`21 to discover, join, and download services 22 from a JlNI LUS.
`
`In the present invention, a mobile phone is equipped with a
`
`Bluetooth chipset.
`
`Thus, the mobile phone can simultaneously be
`
`connected to a cellular network and to an ad—hoc Buletooth Piconet.
`
`Additionally, the Piconet is extended into an IP wireless LAN in order to
`
`utilize JINI technology for the sharing of services between devices in the
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`Piconet. Moreover, the mobile phone includes an interface/Application
`
`Programming Interface (API) which is an abstraction of a SIP and/or
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`H.323 call control client. Just prior to execution, this API is downloaded
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`to the Bluetooth device involved in an external Wireless call in order to
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`have the device behave as a slave device toward the mobile phone which
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`is the master. The API is downloaded only to the device involved in the
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`call since the other Bluetooth devices that are not making the call do not
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`need this particular code. The present invention also anticipates the fact
`
`that many consumer products will be modified to provide multimedia and
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`telephony capabilities. Multimedia laptOp computers, for example, will
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`soon contain microphones, speakers, and video cameras. PDAs will also
`
`have similar features and potentially act as hands-free phones, etc.
`
`FIG. 3 is an illustrative drawing of an ad-hoc network 30 utilizing
`
`Bluetooth, IP, and IlNI technologies in accordance with the teachings of
`
`the present invention to enable the use of a gateway mobile phone. A
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`laptop computer 31, printer 32, and mobile phone 33 are all Bluetooth-
`
`compliant and IINI/Java—capable, enabling ILNI APIs to be transported
`
`between the devices utilizing the Bluetooth radio link 34.
`
`The present invention positions the mobile phone 33 as a gateway
`
`between the ad—hoc network and a 3G wireless 1? network 35 such as the
`
`General Packet Radio Service (GPRS) network. The mobile phone
`
`receives IP packets from the GPRS network through its public IP address,
`
`and forwards the received packets to the private IP address of the
`
`destination device in the Picouet. It also translates in the other direction
`
`for data going out of the Piconet to the GPRS network. With this
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`invention, any Bluetooth-compliant device in a Piconet that is multimedia
`
`capable is able to establish a call as long as one of the devices in the
`
`Piconet (e.g., the mobile phone) contains a cellular radio modem and a call
`
`control client, and is connected to the Wireless IP network. The cellular
`
`radio modem may be, for example, a Wideband Code Division Multiple
`Access (WCDMA) modem, an EDGE radio access modem, orequivalent.
`
`Any Bluetooth-compliant device entering into the Piconet utilizes IlNI
`
`technology in order to discover and publish lookup services that the device
`
`can receive or offer to other devices in the Piconet.
`
`FIG. 4 is a simplified fiJnctional block diagram of a connection
`
`between two devices such as the laptop computer 3 l and the mobile phone
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`33 utilizing the ad—hoc network ’30 of FIG. 3. The present invention
`
`establishes three new interfaces or Application Programming Interfaces
`
`(APIs) between the slave device placing the call and the master mobile
`
`phone, and enhances the H.323 and/or SIP clients in the mobile phone to
`
`act as a server application. The interfaces are preferably implemented as
`
`JINI services. The first interface/AH is an abstraction of a SIP and/or
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`H.323 call control client 41. This interface enables any of the Bluetooth
`
`devices on the Piconet to behave as a slave device toward the mobile
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`phone which is the master. This allows the establishment ofvoice calls in
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`a simple fashion regardless ofthe call control mechanism supported in the
`
`mobile phone or network. The second interface/AH is a SIP client 42
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`PATENT APPLICATION
`DOCKET NO. 1000-0188
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`which enables the use of the full SIP client capabilities. The SIP client
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`interfaces via SIP signaling with a SIP proxy server 43 in the 3G wireless
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`IP network: The third interface/API is an H.323 client 44 which enables
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`the use ofthe full H.323 client capabilities. The H.323 client interfaces via
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`H.323 signaling with an H.323 gatekeeper 45.
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`Utilizing the IN Lookup Service (LUS) 46, the gateway mobile
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`phone 33 must "publish" inthe Bluetooth Piconet, the call control services
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`that it ofiers. The other Bluetooth devices on the Piconet perform an add-
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`in protocol called “discovery and join” to locate the LUS and upload all
`ofits services’ interfaces, including the call control services. The H.323
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`and/or SIP clients in the mobile phone are enhanced to behave as a server
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`application in order for Bluetooth compliant devices to talk to other
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`devices that contain a SIP and/or an H.323 client.
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`In addition to defining a set of protocols for discovery, join, and
`lookup, JINI technology also defines a leasing and transactionmechanism
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`to provide resilience in a dynamic networked environment.
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`The
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`technology and services architecture is powerful enough to support a fully
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`distributed system on a network of workstations, while small enough to
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`build a community of devices out of simple devices such as home
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`entertainment devices or mobile phones.
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`Devices in a network employing .TlNI technology may be tied
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`together using Java Remote Method Invocation (RN11). By using the Java
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`PATENT APPLICATION
`DOCKET NO. 10000188
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`programming language, a JINI connection architecture is secure. The
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`discovery and join protocols, as well as the lookup service depend on the
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`ability to move Java objects, including their code, between Java virtual
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`machines.
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`,
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`Alternatively, JLNI call control APIs may be transmitted to and from
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`the call control server in the mobile phone with the Internet Inter-ORB
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`Protocol (HOP). An ORB is an Object Request Broker utilized in the
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`Common Object Request Broker Architecture (CORBA). CORBA is a
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`strategy, a set of specifications, an infrastructure, and a set of tools that
`enables reusable programming objects to be used by many applications in
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`a platform-independent manner. The architecture provides general
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`services and request and response capabilities at a low level, independent
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`of the upper level architecture.
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`The distribution of a variety of
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`prognnnnfinglanguagesissuppofled.
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`Fixed telecommunications protocols such as ANSL4] or SS7 have
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`a problem when a new parameter is added to an existing message, or a
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`new message is added because existing applications may not be able to
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`handle the changes. The applications then do not work when a node in the
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`network is updated with the latest revision of the protocol. As noted
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`above, the present invention overcomes this problem by using a solution
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`that is more closely aligned with the approach developed by the computer
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`industry. The solution is more API-centric in that, rather than defining a
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`PATENT APPLICATION
`DOCKET NO. 1000-0188
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`large set of protocols, an API is published toward an application, and the
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`application uses the API as a client. Of course, the API, which may be a
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`small piece of Java code, is’ transmitted as messages over the wire; but
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`rather than having a large number of distinct messages, the present
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`invention uses a call control client such as a SIP client in the mobile phone
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`that can only generate a few generic messages such as Get, Send, Receive,
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`etc.
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`In the present invention, a JINI call control API 47 is published by
`
`the mobile phone 33 and enables the applications 21 in the laptop and
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`other devices in the Piconet to make use of the facilities of, for example,
`
`the SIP client 42 in the mobile phone. The IINI call control API is an
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`abstraction of both SIP and H.323 since at this time it is not known
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`whether SIP or H.323 will be the accepted standard. Once a stande is
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`determined, the API may be constructed as an abstraction of one or the
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`other, or an equivalent call control protocol.
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`Assuming that the preferred standard is SIP, when the user desires
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`to send a call, he is actually instructing the mobile phone to send a SIP
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`INVITE message, which is the initial SIP message to establish a call. The
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`mobile phone, regardless of Whether it supports Sfl’ or H.323 generates
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`the right sequence of messages to SIP the call. This approach is
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`substantially simpler than the direct utilization of these protocols, and it
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`decouples all the applications from the underlying infrastructure.
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`its:
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`PATENT APPLICATION
`DOCIGET NO. 1000-0188
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`Many useful network activities are possible with the network
`
`architecture of the present invention. For example, a user with a
`
`Bluetooth-compliant mobile phone may walk into a room that has a printer
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`and a laptop computer, both of which are also Bluetooth-compliant.
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`However, in this example, there is no WCDMA or EDGE radio access
`
`modem in the lapt0p. Regardless ofthis fact, with the present invention,
`
`he can still print a file hour the laptop on the printer, and can also establish
`
`a voice or video call from the laptop. Today, the user would have to
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`purchase a 8]? client and install the SIP client in the laptop in order to do
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`so. Since installing the SIP client involves configtning the laptop to get a
`
`static or dynamic IP address, and many other specialized tasks, it is
`
`beyond the capability of most consumers.
`
`In the present invention, the laptop uses the mobile phone as a
`
`gateway toward the wireless IP network. When all these Bluetooth
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`devices are located within approximately 10 meters of each other for a low
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`power Bluetooth Piconet, or within approximately 100 meters of each
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`other for a high power Bluetooth Piconet, the mobile phone connects to the
`
`Bluetooth Piconet as well as to the wireless network. At that point, all of
`
`the devices on the Piconet publish the services they can provide to the
`
`other devices through the JINI LUS. If a visitor with a communication
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`device such as a PDA comes to the office location and wants to send some
`
`e—mail, but does not have a connection, he may register with the Piconet
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`PATENT APPLICATION
`DOCKET NO. 1000-0188
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`and use the call control client that the host’s mobile phone is providing.
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`He can then send and receive his e—mail through the host’s mobile phone.
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`A password may be required to a'ccess the services available in the
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`Piconet.
`
`The services menu on the laptop indicates all services available on
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`the Piconet. When the user places a call fiom the laptop, the SIP client in
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`the mobile phone sends an API to the laptop that is used to route the call
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`through the mobile phone to the wireless IP network. The SIP client in the
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`mobile phone behaves as a server application for the Piconet, and another
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`API is downloaded to the laptop in order to connect to the server. The
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`phone acts as a server application toward the laptop, and acts as a client
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`and gateway toward the wireless IP network.
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`In the preferred embodiment, the mobile phone has two IP
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`addresses: apublic IP address recognized by the wireless IP network such
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`as an external GPRS network, and a private IP address recognized by the
`other devices on the Piconet. The use of private 1? addresses on the
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`Piconet is beneficial in two ways. First, security is enhanced on the
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`Piconet since outside entities do not know the private IP address of each
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`device and therefore cannot gain direct access to those devices. Second,
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`the use of private IP addresses helps with the problem of the depletion of
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`public IP address.
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`PATENT APPLICATION I
`DOCKET NO. 1000-0188
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`The mobile phone has a radio access modem and a Bluetooth
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`chipset, so it has two interfaces. The two physical interfaces may appear
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`with the same logical IP address, but this is not preferred since the other
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`Bluetooth devices would then require public 113 addresses as well.
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`In the wireless 1? network 35, the existence of the laptop 31 is not
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`known. The only IP address that is known is the public IP address of the
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`mobile phone 33 which is published in the wireless IP network. All
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`incoming IP packets toward the mobile phone that are targeted toward the
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`laptop application 21 are received on the public IP address of the mobile
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`phone and are then pushed to the private IP address of the appropriate
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`device (the laptop) on the Bluetooth Piconet.
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`Several potential problems involving public and private IP addresses
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`are resolved by the API that is sent fiom the SIP client in the mobile phone
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`to the laptop. First, the use ofprivate IP addresses in public IP networks
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`can cause problems since the assignment of private IP addresses is not
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`controlled at a higher level, and duplicate private IP addresses can be
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`assigned to difi‘erent parties.
`In the present invention, the public IP
`address of the mobile phone is used for communications in the public
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`network. An additional problem may arise ifa National Access Translator
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`(NAT), as proposed by the Internet Engineering Task Force (IETF), is
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`used in an attempt to overcome the problem of duplicate private IP
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`addresses. The NAT device temporarily provides a networked device with
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`PATENT APPLICATION
`DOCIQET NO. 1000-0188
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`a global public IP address when the device desires to communicate outside
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`ofits private network. However, in real-time applications] such as Voice-
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`over-IP (VoIP), the IP addresses of the parties are contained in the
`payload itselfin addition to the packet headers. The situation may arise,
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`therefore, when the NAT device changes the source IP address in the
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`header to a temporary public I? address, but the payload still identifies the
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`source IP address as the private IP address. Thus, there is an IP address
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`mismatch that creates problems for real—time applications such as VoIP.
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`In the present invention, the API ensures that this mismatch does not
`OCCUI.
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`The invention is not limited to wireless office applications, but has
`
`many other potential uses. For example, a user may have a Bluetooth-
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`compliant screen phone in his house, and the phone is connected to a cable
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`modem. When he enters his house with his Bluetooth-compliant mobile
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`'
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`phone, the mobile phone recognizes that there is already a Bluetooth
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`device on the Piconet that enables the user to place calls. The mobile
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`phone may then disconnect from the external wireless network while
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`remaining connected to the Bluetooth Piconet. Thereafier, if the user
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`places a call with his mobile phone fiom within his house, the mobile
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`phone behaves as a cordless phone that is linked to the screen phone as a
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`base unit. Therefore, the call goes through the screen phone that is
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`connected to the cable or DSL modem. Thus, the Piconet enables the call
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`PATENT APPLICATION
`DOCKET NO. 1000-0188
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`to be placed inthe most cost-eifective manner. Upon exiting the houise,
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`the mobile phone loses the Bluetooth connection and re-connccts to the
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`external wireless network.
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`'
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`The mobile phone may connect to multiple independent Piconets
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`since each Piconet is limited to eight devices on the network. This
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`configuration requires that the mobile phone
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