United States Patent [191
`Van den Heuvel et al.
`
`I 111111111111111111111111111111111111 IIIII IIIHlllll lllll lillll Ill lllll 1111
`US005301359A
`[111 Patent Number:
`[45) Date of Patent:
`
`5,301,359
`Apr. S, 1994
`
`[54) BULLETIN BOARD RESOURCE FOR
`COMMUNICATION SYSTEM ACCESS
`
`(75)
`
`Inventors: Anthony P. Van den Heuvel,
`Parkland, Fla.; Richard A. Comroe,
`Dundee, Ill.; Arun Sobti, Wheaton,
`Ill.; Anthony J. Sarli, Jr.,.Palatine,
`Ill.
`(73) Assignee: Motorola, Inc., Schaumburg, Ill.
`[21) Appl. No.: 76,924
`[22) Filed:
`Mar. 9, 1993
`
`Related U.S. Application Data
`[63) Continuation of Ser. No. 344,176, Apr. 27, 1989, aban(cid:173)
`doned.
`Int. CI.5 ............•.•.........................•...... H04Q 7/00
`(51)
`[52) U.S. CI . .................................. 45S/S6.1; 455/54.1;
`455/33.1; 455/34.1
`[58) Field of Search ................... 455/33, 54, 56, 9, 88,
`455/854, 156, 34.1, 2, 56.l, 15, 33.1, 38.4, 54.1,
`54.2; 340/825.44; 370/95.2, 95.1; 379/59, 60;
`358/85
`
`[56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`4,251,805 2/1981 Moore et al. ...................... 370/95.2
`4,633,509 12/1986 Scheiner! .............................. 455/38
`
`4,736,453 4/1988 Schloemer ............................ 455/67
`4,748,681 5/1988 Schmidt ............................. 370/95.1
`4,850,033 7/1989 Eizenhofer et al. .................. 455/56
`4,876,738 10/1989 Selby ..................................... 379/59
`4,905,301 2/1990 Krolopp et al .................... 455/34.1
`5,003,629 3/1991 Ness-Cohn et al. ............... 455/56.1
`5,058,199 10/1991 Grube ................................ 455/54.2
`5,125,103 6/1992 Grube et al ........................ 455/33.1
`
`FOREIGN PATENT DOCUMENTS
`2750071 5/1979 Fed. Rep. of Germany .
`
`OTHER PUBLICATIONS
`Tellabs Advertisement; Telephony Oct. 1980, p. 2.
`
`Primary Examiner-Edward L. Coles, Sr.
`Assistant Examiner-Jill Jackson
`Attorney, Agent, or Firm-Steven G. Parmelee; Susan L.
`Lukasik
`
`ABSTRACT
`[57)
`A bulletin board communication resource provides a
`message to communication units regarding available
`communication systems in a particular geographic area.
`The bulletin board resource also supports registration of
`the communication unit with one or more of these sys(cid:173)
`tems as selected by the communication unit.
`
`24 Claims, 2 Drawing Sheets
`
`__ __._ ___ 104
`COMMUNICATION
`UNIT
`
`_ _ ......_ __ 201
`PAGING ~~ ON-SITE FIXED
`TRANSMITTER
`EQUIPMENT
`
`204
`
`203
`
`208
`
`206
`
`202
`
`REPEATER
`
`RESOURCE
`CONTROLLER
`
`~._.. BULLETIN BOARD
`CONTROLLER
`207
`
`Ex.1023
`APPLE INC. / Page 1 of 7
`
`

`

`U.S. Patent
`
`Apr. 5, 1994
`
`Sheet 1 of 2
`
`5,301,359
`
`101
`SYSTEM 1
`
`102
`SYSTEM 2
`
`104
`
`COMMUNICATION
`UNIT
`
`F IG.1
`
`--------
`
`COMMUNICATION
`UNIT
`
`104
`
`, - - - . . . _ _ - - I 2 01
`PAGING
`---~ ON-SITE FIXED
`TRANSMITTER
`EQUIPMENT
`
`204
`
`208
`
`206
`
`202 lo---''---'---,
`REPEATER
`
`RESOURCE . . - . - . i BULLETIN BOARD
`CONTROLLER
`CONTROLLER
`._ ___ .. 207 ._ ____ _.
`
`FIG.2
`
`Ex.1023
`APPLE INC. / Page 2 of 7
`
`

`

`U.S. Patent
`
`Apr. 5, 1994
`
`Sheet 2 of 2
`
`5,301,359
`
`301
`
`b-
`
`TRANSCEIVER
`No. 1
`
`j
`
`/ 302
`SIGNAL
`-
`- PROCESSING UNIT
`
`·~
`
`I' 307
`
`I' 306
`
`-
`
`-
`
`OUTPUT
`UNIT
`
`301
`
`303"'
`~
`
`-
`
`'
`
`TRANSCEIVER -
`
`No. 2
`
`301
`
`304"'
`\.
`-
`
`t
`TRANSCEIVER
`No. 3
`
`104
`
`308,
`
`Ir
`
`CONTROLLER
`
`-
`
`F IG.3
`
`/309
`
`/311
`
`DISPLAY I
`INPUT I
`
`:
`
`F IG.4
`309 - - - - - - - - - - - - - - ,
`PAGING
`SMR TRUNKING
`('\ni sT·r·r·
`l. i c.
`vi\~-
`
`401
`
`F IG.5 A
`
`503
`I
`
`501
`I
`
`BULLETIN
`BOARD
`OUTBOUND
`
`501
`
`I ? MENU
`
`COMMUNICATION
`UNIT OUTBOUND
`
`F IG.5 B
`I REGISTRATION I
`
`502
`I
`
`REQUEST
`
`Ex.1023
`APPLE INC. / Page 3 of 7
`
`

`

`1-
`
`5,301,359
`
`2
`FIG. 2 comprises a block diagram depiction of the
`invention as configured in a multi-system environment;
`FIG. 3 comprises a block diagram depiction of a
`portion of a communication unit;
`FIG. 4 comprises a detailed depiction of a display for
`the communication unit; and
`FIGS. SA and SB comprise timing diagrams of bulle(cid:173)
`tin board resource signalling.
`
`BULLETIN BOARD RESOURCE FOR
`COMMUNICATION SYSTEM ACCESS
`
`This is a continuation of application Ser. No. 5
`07/344,176, filed Apr. 27, 1989 and now abandoned.
`
`TECHNICAL FIELD
`This invention relates generally to RF communica(cid:173)
`tion systems, and particularly to methodologies that 10
`allow a communication unit to access more than one
`type of communication system.
`
`25
`
`BACKGROUND ART
`RF communication systems in many varied forms are 15
`well understood in the art. For example, wide area low
`bandwidth systems (such as paging systems) typically
`provide one way communications on relatively narrow
`channels at relatively low bit rates (such as 1200 bps).
`Medium area systems, such as SMR trunking, provide 20
`more functionality over a more limited geographic area
`and rely in part upon a higher bit rate (such as 3600 bps)
`to support necessary data communications. Limited
`coverage high bandwidth systems are also known, and
`typically require the use of much higher bandwidth
`channels (such as 200 kHz to 2 MHz) and much higher
`bit rates (such as 270 kbps to 1.6 mbps). Examples of
`such systems are digital cellular communications sys(cid:173)
`tems as envisioned pursuant to the GSM program, and 30
`the digital electronic cordless telephone (DECT) pro(cid:173)
`gram intended for on-site applications.
`As is known in the art, these systems are collectively
`similar in that each communication supported by these
`communication systems necessarily includes an RF 35
`wireless communication link.
`These and other systems are, or will soon be, found in
`numerous locations throughout the world, and often in
`overlapping configurations. That is to say, in a given
`metropolitan area, a particular communication user may 40
`have theoretical access to a plurality of communication
`systems. Since these communication systems tend to
`have differing operating characteristics, however, such
`as differing bit rates, bandwidths, signalling protocols,
`registration requirements and the like, in practice a 45
`single user will only be able to access such multiple
`systems by obtaining multiple communication units that
`are each compatible with one of the systems. For-exam(cid:173)
`ple, to obtain benefit of only some of the RF services
`available in his area, a user may equip his automobile 50
`with a mobile cellular telephone, one or more land
`mobile radios (to allow access to one or more trunked
`or conventional land mobile systems), and a mobile data
`terminal to allow exchange of data. In addition, the user
`may himself carry a pager.
`The necessity of obtaining, maintaining, and operat(cid:173)
`ing all of this equipment to gain access to only a few of
`the RF communication services offered in a particular
`area is undesirable. A need exists for a communication
`unit that can readily access more than one type of com- 60
`munication system, and for an infrastructure that will
`accommodate such a communication unit to afford
`access to the differing communication systems.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`FIG. 1 comprises a generalized geographic depiction
`of an area having multiple, but differing, communica(cid:173)
`tion systems;
`
`BEST MODE FOR CARRYING OUT THE
`INVENTION
`In FIG. 1, the invention is perhaps more readily ex-
`plained by presuming a geographic setting that includes
`three differing RF communication systems; system 1
`(101), system 2 (102), and system 3 (103). System 1 (101)
`may be, for example, a wide area paging service that
`covers a relatively wide geographic area with a rela(cid:173)
`tively simple grade of selective call one-way service.
`System 2 (102) may be, for example, an SMR 800 MHz
`RF communication system wherein two-way voice
`(and/or data) communications are supported within a
`somewhat smaller geographic area through appropri(cid:173)
`ately allocated RF frequency resources. Lastly, system
`3 (103) may be, for example, an on-site RF communica(cid:173)
`tion system that makes use of a wide bandwidth high bit
`rate configuration to provide a wide functionality capa-
`bility over a relatively limited geographic area (such as
`within a building or over a business campus).
`A communication unit (104) (which may be either a
`mobile or portable unit) may be found at various times
`in different geographic locations, and hence within
`range of various combinations of RF service availabil-
`ity. For example, in the geographic position depicted in
`FIG. 1, the communi~ation unit (104) could have access
`to either system 1 (101) or system 2 (102).
`In FIG. 2, system 1 (101) includes generally one or
`more paging transmitters (201), system 2 (102) includes
`a plurality of repeaters (202) and a resource controller
`(203) to at least partially control allocation of the re(cid:173)
`peaters amongst users, and system 3 (103) includes ap(cid:173)
`propriate on-site fixed equipment (204) to facilitate sup-
`port of its services, all as in accordance with well under(cid:173)
`stood prior art technique. In addition, pursuant to this
`invention, a bulletin board controller (206) couples to
`the infrastructure (201, 203, and 204) for each of the
`systems (101, 102, and 103), through an appropriate
`communication link (207) (which link may be any ap(cid:173)
`propriate medium of information exchange, including
`temporary or dedicated landlines, or RF links). So
`linked, the bulletin board controller (206) can provide
`information to the various systems, such as registration
`information as described below. In addition, the bulletin
`board controller (206) can receive information from the
`various systems, such as current functionality, loading,
`55 and other information pertinent to the current availabil(cid:173)
`ity of the individual systems and their services.
`The bulletin board controller (206) also includes an
`independent RF link (208) by which the bulletin board
`controller (206) can transmit and receive pertinent in(cid:173)
`formation regarding access to the various communica(cid:173)
`tion systems, also as described below.
`In FIG. 3, the communication unit (104) appears in
`more detail.
`The communication unit (104) includes one or more
`65 appropriate antennas (not shown), and antenna switches
`(not shown) to control coupling of this antenna (or
`antennas) as well understood in the art. This structure
`then couples (301) to a plurality of transceivers
`
`Ex.1023
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`

`

`30
`
`3
`(302-304). In this embodiment, each transceiver is capa(cid:173)
`ble of accommodating the particular operating charac(cid:173)
`teristics of a particular communication system, includ(cid:173)
`ing bandwidth, bit rate, and the like. (It would of course
`be possible, in an appropriate embodiment, to provide a 5
`single transceiver that would have sufficiently variable
`operating characteristics as to allow the transceiver to
`be appropriately configured to operate in satisfactory
`conjunction with any of the differing operating charac(cid:173)
`teristics of the various communication systems.) The 10
`outputs of the transceivers (302,-304) then couple to an
`appropriate signal processing unit (306), which itself
`couples to an appropriate output unit (307). For exam(cid:173)
`ple, if voice messages are received, the signal processing
`unit (306) can appropriately recover and process these 15
`signals and the output unit (307) can render these signals
`audible. If data signals are received, the signal process(cid:173)
`ing unit (306) can appropriately decode the message and
`provide the recovered message to the output unit (307),
`which may include a graphic display to allow the data 20
`to be displayed and read.
`The transceiver outputs also couple to an appropriate
`controller (308) such as a microprocessor satisfactory to
`the application. The controller (308) itself couples to a
`display unit (309) and an input unit (311). So configured, 25
`an operator can provide appropriate input control infor(cid:173)
`mation to the controller via the input (311), and the
`controller (308) can provide output information in an
`appropriate form via the display (309) for benefit of the
`operator.
`So configured, the controller (308) can control which
`of the transceivers (302-304) operates in the communi:
`cation unit (104) and can additionally function to de(cid:173)
`code at least some of the signals received by the trans(cid:173)
`ceivers and provide information to an operator via the 35
`display (309) regarding such decoded information.
`Operation of the system may now be described. The
`bulletin board controller (206) transmits on a bulletin
`board outbound communication resource, such as a
`dedicated RF frequency. (Preferably, this outbound 40
`resource will be substantially universally standardized
`for this particular function to enable rapid acquisition of
`the bulletin board resource by a communication unit. In
`the alternative, the particular outbound resource used
`by a particular bulletin board controller may be one of 45
`a number of resources that are dedicated to and stan(cid:173)
`dardized for transmission of bulletin board information.
`As a lessor desirable alternative, this resource may sim(cid:173)
`ply be a dedicated resource for a particular geographic
`area, and the communication unit would be required to 50
`locate this resource either through an appropriate scan
`mechanism or by direction of the operator).
`In FIG. Sa, this outbound bulletin board resource
`would include a transmission from the bulletin board
`controller (206), from time to time, of a menu message 55
`(501). This menu message (501) would include informa(cid:173)
`tion regarding available communication systems. This
`information could include information regarding identi(cid:173)
`fication of the service itself (i.e., wide area paging ser(cid:173)
`vice, SMR service, on-site service, cellular service, 60
`encrypted voice service, data capability, community
`repeater access, and the like), control resource informa(cid:173)
`tion and/or specific interface protocols (if any), unusual
`operating parameter information that the communica(cid:173)
`tion unit might be configured to conform information 65
`(such as frequencies, frequency pairing, channel spac(cid:173)
`ing, deviation tolerances, TDM time frame and slot
`information, and the like), cost information, and other
`
`5,301,359
`
`4
`pertinent information as may be appropriate to a partic(cid:173)
`ular system, including access availability.
`The communication unit (104), upon locating the
`outbound bulletin board resource, receives the menu
`message (501) and appropriately processes it to recover
`the above indicated information. The communication
`unit (104) can then provide for selection of one or more
`of the available servi¢es, either on an automatic basis or
`by direct operator intervention. Having selected the
`appropriate system or systems desired, the communica(cid:173)
`tion unit (104) can source a registration request message
`(502) (FIG. Sb) on a bulletin board inbound resource
`that is associated with the bulletin board outbound re(cid:173)
`source (this could be accomplished, for example, by
`paired frequencies, dedicated time slots in a single chan(cid:173)
`nel system, or with a simpler contention based single
`channel resource).
`The bulletin board controller (206) receives the regis(cid:173)
`tration request (502) and provides for appropriate regis(cid:173)
`tration of the communication unit (104) with the com(cid:173)
`munication systems as selected by the communication
`unit (104). In this embodiment, the bulletin board con(cid:173)
`troller (206) then transmits a registration grant (503) to
`the communication unit (104) to acknowledge the regis(cid:173)
`tration request (502) and to indicate communication
`system access as requested has been granted. The com(cid:173)
`munication unit (104) can then select the transceiver
`appropriate to the system and service selected, and
`begin operation as a communication entity within the
`selected system using the information provided by the
`bulletin board resource.
`If desired, the communication unit (104) can occa(cid:173)
`sionally use its unselected transceivers to briefly moni(cid:173)
`tor other available systems, the identities of which are
`known to the communication unit (104) due to the menu
`message (501). By this mechanism, the communication
`unit (104) can occasionally determine the availability
`status, due to its geographic location, of the various
`systems located within the geographic area governed
`by the bulletin board controller (206). With this infor(cid:173)
`mation, the communication unit (104) can alter its own
`system status automatically on a prioritized basis as
`more desired systems become available due to move(cid:173)
`ment of the communication system (104) throughout
`the area, or the availability of the other systems can
`simply be made known to the operator.
`In FIG. 4, one embodiment of the communication
`unit provides a display (309) that includes an alphanu(cid:173)
`meric display of the systems that are indicated in the
`menu message. For example, in the description noted
`above, the bulletin board controller (206) would indi(cid:173)
`cate availability of three systems, the paging system
`(101), the SMR trunking system (102), and the on-site
`system (103). All three systems could be displayed to
`provide the operator with information regarding_ gen(cid:173)
`eral availability of these systems. The paging and SMR
`trunking systems are displayed in bold lettering to pro(cid:173)
`vide notice that both systems are currently within range
`of the communication unit (104) and that either could be
`selected by the unit. The on-site system, although noted
`on the display as generally available in the area, is de(cid:173)
`picted in non-boldface characters to indicate that the
`on-site system is not currently accessible to the commu(cid:173)
`nication unit (104), in this case because of geographic
`range limitations.
`The display may also include an appropriate indicia
`(401) of the system or systems that have been selected
`by the communication unit (104) and with which the
`
`Ex.1023
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`

`

`20
`
`5
`communication unit (104) has been registered via the
`bulletin board controller (206). In FIG. 4, this indicator
`(401) provides notice that the communication unit (104)
`currently functions as a trunked land mobile radio oper-
`ating within the SMR trunking system (102).
`What is claimed is:
`1. A method of providing communication system
`access for a 2-way wireless radio frequency (RF) com(cid:173)
`munication unit as between at least two RF communica(cid:173)
`tion systems, wherein the at least two RF communica- 10
`tion systems are independent of one another, and
`wherein each communication supported by the at least
`two RF communication systems necessarily includes an
`RF wireless communication link, comprising the steps
`of:
`A) monitoring, by the 2-way wireless RF communi(cid:173)
`cation unit, an RF bulletin board resource to obtain
`information regarding each of the at least two RF
`communication systems;
`B) transmitting to the 2-way wireless RF communica(cid:173)
`tion unit on the RF bulletin board resource regis(cid:173)
`tration information of at least one of the at least
`two RF communication systems.
`2. The method of claim 1 wherein the at least two RF 25
`communication systems have differing operating char(cid:173)
`acteristics.
`3. The method of claim 1 wherein the RF bulletin
`board resource is substantially independent of all of the
`at least two RF communication systems.
`4. The method of claim 1 wherein the step of moni(cid:173)
`toring includes obtaining the information in the form of·
`a data message.
`S. The method of claim 1 wherein the step of trans(cid:173)
`mitting includes transmitting the information as a data 35
`message.
`6. The method of claim 1 wherein the information
`monitored and the information transmitted is monitored
`and transmitted as data messages.
`7. The method of claim 1 and further including the 40
`step of:
`C) receiving on the RF bulletin board resource infor(cid:173)
`mation regarding acknowledgment of the registra(cid:173)
`tion information.
`8. The method of claim 7 and further comprising the 45
`step of:
`D) beginning communications operation on at least
`one of the at least two RF communications systems
`for which registration information was transmitted.
`9. The method of claim 1 wherein the monitoring
`information obtained in the monitoring step includes at
`least identification information of the at least two RF
`communication systems.
`10. The method of claim 9 wherein the step of moni- 55
`tqring includes the step of:
`Al) displaying at least part of the identification infor(cid:173)
`mation.
`11. A method of providing to a 2-way wireless radio
`frequency (RF) communication unit information re- 60
`garding communication system capabilities for at least a
`first and second RF communication systems, wherein
`the first and second RF communication systems are
`independent from one another and have differing oper(cid:173)
`ating characteristics, and wherein each communication 65
`supported by the first and second RF communication
`systems necessarily includes an RF wireless communi(cid:173)
`cation link, comprising the steps of:
`
`30
`
`50
`
`5,301,359
`
`5
`
`15
`
`6
`A) monitoring an RF bulletin board resource that is
`independent of both the first and second RF com(cid:173)
`munication systems;
`B) receiving information on the RF bulletin board
`resource regarding at least the first and second RF
`communication systems.
`12. A method of enabling a 2-way wireless radio
`frequency (RF) communication unit, comprising the
`steps of:
`A) locating, via the 2-way wireless RF communica(cid:173)
`tion unit, an RF bulletin board resource that trans(cid:173)
`mits information regarding a plurality of indepen(cid:173)
`systems,
`dent available RF communication
`wherein each communication supported by the at
`least two RF communication systems necessarily
`includes an RF wireless communication link;
`B) receiving the information;
`C) selecting, via the 2-way wireless RF communica(cid:173)
`tion unit, at least one desired RF communication
`system from said plurality of independent available
`RF communication systems.
`13. The method of claim 12 wherein the RF bulletin
`board resource is substantially independent of the avail(cid:173)
`able RF communication systems.
`14. The method of claim 12 wherein the step of re(cid:173)
`ceiving the information includes the step of:
`Bl) providing a display related at least in part to at
`least some of the information.
`15. The method of claim 12 wherein the step of select(cid:173)
`ing includes the step of:
`Cl) providing a display providing information relat(cid:173)
`ing to the at least one RF desired communication
`system.
`16. The method of claim 12 wherein the step of re(cid:173)
`ceiving the information includes the step of providing a
`display of at least some of the information, and wherein
`the step of selecting includes a step of providing a dis(cid:173)
`play regarding the at least one desired RF communica(cid:173)
`tion system.
`17. A method of enabling a 2-way wireless radio
`frequency (RF) communication unit, comprising:
`A) locating an RF bulletin board resource that trans(cid:173)
`mits information regarding a plurality of indepen(cid:173)
`systems,
`available RF communication
`dent
`wherein each communication supported by the at
`least two RF communication systems necessarily
`includes an RF wireless communication link;
`B) receiving the information;
`C) selecting at least one desired RF communication
`system, wherein the step of selecting includes a
`step of transmitting a request to operate on the at
`least one desired RF communication system.
`18. The method of claim 12 wherein the step of select(cid:173)
`ing further includes the step of receiving an acknowl(cid:173)
`edgment of a request to operate on the at least one
`desired RF communication system.
`19. The method of claim 18 wherein the step of select(cid:173)
`ing further includes the step of locating the desired RF
`communication system and beginning operation as an
`RF communication unit within that RF communication
`system.
`20. The method of claim 12 and including the further
`the steps of:
`D) determining that the desired RF communication
`system is unavailable;
`E) repeating from step A.
`21. A 2-way wireless radio frequency (RF) communi(cid:173)
`cation unit capable of compatibly operating in a plural-
`
`Ex.1023
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`

`7
`ity of RF communication systems that have different
`operating characteristics from one another, wherein
`each communication supported by the at least two RF
`communication systems necessarily includes an RF
`wireless communication link, the 2-way wireless RF
`communication unit comprising:
`A) transceiver means for allowing the 2-way wireless
`RF communication unit to transceive on at least
`some RF communication resources;
`B) control means for controlling the transceiver
`means by selectively;
`i) causing the transceiver means to communicate
`on an RF bulletin board resource to obtain infor(cid:173)
`mation regarding available RF communication
`systems that are independent from one another;
`ii) causing the transceiver means to communicate
`on the RF bulletin board resource to select at
`least one of the available RF communication
`systems; and
`iii) causing the transceiver means to communicate 20
`on an RF communication resource associated
`with said selected at least one of said available
`RF communication systems.
`22. The 2-way wireless RF communication unit of
`claim 21 wherein the 2-way wireless RF communica- 25
`tion unit further includes display means responsive to
`
`8
`the control means for displaying at least some informa(cid:173)
`tion regarding said available RF communication sys(cid:173)
`tems.
`23. The 2-way wireless RF communication unit of
`5 claim 22 wherein the display means further displays
`information regarding said selected at least one of said
`available RF communication systems.
`24. A method for providing communication system
`access for a 2-way wireless radio frequency (RF) com-
`10 munication unit as between at least two RF communica(cid:173)
`tion systems, wherein the at least two RF communica(cid:173)
`tion systems are independent of one another and the at
`least two RF communication systems provide one or
`more RF communications service, and wherein each
`IS communication supported by the at least two RF com(cid:173)
`munication systems necessarily includes an RF wireless
`communication link, comprising the steps of:
`A) monitoring an RF bulletin board resource to ob(cid:173)
`tain information regarding at least one of the one or
`more RF communication services offered by each
`of the at least two RF communication systems;
`B) transmitting on the RF bulletin board resource
`registration information for at least one RF com(cid:173)
`munication service of the at least two RF commu-
`
`5,301,359
`
`nication systems . •
`
`30
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`Ex.1023
`APPLE INC. / Page 7 of 7
`
`