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`OFFICE
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`TRANSMITTAL LETTERTOTHE UNITED STATES DESIGNED/ELECTED OFFICE
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`(DOIEOIUS) CONCERNING A FILING UNDER 35 U.S.C. 371
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`U.S. ”Tactic/.008(ifknown,see37 CFR1.5)
`959
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`INTERNATIONAL APPLICATION No.
`PCTIEP01I09258
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`INTERNATIONAL FILING DATE
`AUGUST 3, mm
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`INTERNATIONAL APPLICATION No.
`PCT/EP01I09258
`
`JC‘I3 Rec’d PCT/FTC 0 4 APR 2062
`ATTORNEY'S DOCKET NUMBER
`PHDE 000238
`
`17 [XI The following fees are submitted:
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`"
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`PHDE000238
`
`"
`
`‘°
`
`5/1”?)
`
`1
`
`I 0 ,1 U 89 9 5 9
`
`.1013 Rec'd PCT/PTO 0 4 APR mm
`29.03.2002
`
`Method, network and control station for the two-way alternate control of radio systems of
`different standards in the same frequency band
`
`The invention relates to a method of alternate control of radio systems of
`different standards in the same frequency band.
`
`,5
`
`
`
`20
`
`A radio system for wireless transmission of information is allowed to use
`
`transmission power only in accordance with standards. The national regulation authority
`determines on what fiequ‘encies with what transmission power and in accordance with what
`. radio interface standard a radio system is allowed to transmit. For this purpose there is
`
`/‘
`
`provided for so—termed ISM fiequency bands (Industrial Scientific Medical) that radio
`
`systems transmit in the same frequency band in accordance with different radio interface
`
`standards. An example of this is the US radio system IEEE802.1 la and the European ETSI
`BRAN HiperLAN/Z. The two radio systems transmit in the same frequency bands between
`5.5 GHz and 5.875 GHz with approximately the same radio transmission method, but
`different transmission protocols.
`
`In the event of interference, method were standardized for an active switching
`. to another frequency within the permitted frequency band, for controlling transmission power
`and for the adaptive coding and modulation to reduce interference. Radio systems of
`wideband LANs of the radio interface standards ETSI BRAN HiperLAN/2 and IEEE802.1 la
`utilize the same radio transmission method, a 64-carrier OFDM method and an adaptive
`modulation and coding. About the same modulation and coding methods (Link Adaptation,
`LA) are defined for the two standards.
`
`The Medium Access Control (MAC) of the two systems is totally different.
`
`ETSI BRAN HiperLAN/2 utilizes a centrally controlled reservation-based method in which a
`
`radio station takes over the role of a central instance co-ordinating the radio resources. This
`
`central radio station (Access Point, AP) which may be an access point to the wide area
`
`25
`
`network, periodically signals every 2 ms the MAC frame structure from the AP and the
`
`associated stations if required.
`
`The IEEE802.11a standard describes a CSMA/CA (Carrier Sense Multiple
`Access/Collision Avoidance) method not based on reservations, in which all the radio
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`‘
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`PHDE00023 8
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`m
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`2
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`29.03.2002
`
`stations listen in on the medium and assume that the channel is unused for a minimum
`
`duration (Short InterFrame Space, SIFS) before 802.11a—MAC frames, thus user data
`
`packets, are transmitted if necessary. The method is highly suitable for self-organizing ad hoc
`
`networks, but requires positive acknowledgements of all the packets. Measures supporting
`
`5
`
`service quality (Point Coordination Function PCF) in addition allow the support of
`
`multimedia applications. Fig. 2 shows by way of example the sequence for media access in
`
`accordance with IEEE802.1 la. In accordance with a variant of the standard a station is to
`
`then transmit an RTS packet (Ready To Send) and wait for a CTS packet (Clear To Send)
`
`from the addressed station before it is allowed to transmit user data. All the other stations in
`the radio coverage area set a time monitoring (Network Allocation Vector, NAV) and do not
`
`transmit until the addressed station has sent an acknowledgement (ACKnowledge, ACK).
`
`Wideband LANs in accordance with the HiperLAN/2 and 802.113 standards
`
`will operate in the same frequency band in the future between 5.15 and 5.825 GHz. The
`
`Wideband LANs work with Transmitter Power Control (TPC), it is true, with adaptive radio
`
`transmission methods and the Dynamic Frequency Selection (DFS) to minimize the
`
`alternating interfering effects, these methods, however, do not make optimum use and
`
`spreading possible of the radio channels over the stations which transmit in accordance with
`
`different standards. The guarantee of the service quality necessary for the multimedia
`
`applications is impossible in the case of interference caused by their own stations or stations
`
`of outside systems. In case of alternating interference, systems do not work efficiently and
`occupy a frequency channel even at low transmission rates.
`
`10
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`
`
`
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`It is an object of the invention to provide a method, a wireless network and a
`
`control station which make efficient use of radio transmission channels possible.
`
`25
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`This object is achieved for the method in accordance with the invention by an
`
`interface control protocol method for a radio system, which system comprises at least a
`
`frequency band provided for the alternate use of a first and a second radio interface standard,
`
`the radio system comprising stations which operate in accordance with a first radio interface
`
`standard and/or a second radio interface standard, respectively, a control station being
`
`30
`
`provided which controls the alternate use of the frequency band.
`
`The invention is based on the idea of providing a comprehensive standard
`
`exchange of implicit or explicit control information in systems that have the same radio
`
`transmission methods but different radio transmission protocols. This makes a simple and
`
`efficient use possible of a radio channel Via a plurality of radio interface standards.
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`“
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`PHDE000238
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`3
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`29.03.2002
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`The radio system comprises one or more stations. The stations may be, for
`
`example, computers of a wireless local area network. These stations may be arranged, for
`
`example, only for operation in accordance with a first er second radio interface standard. But
`
`it is also possible for stations to operate in accordance with both the first and the second radio
`interface standard.
`
`5
`
`A first number of stations preferably forms a Wireless local area network in
`
`accordance with a first radio interface standard and a second number of stations forms a
`
`wireless network in accordance with a second radio interface standard. The first radio
`
`interface standard may be, for example, the HiperLAN/2 standard and the second radio
`
`10
`
`interface standard may be the IEEE802.1 1a standard.
`
`For these two standards is reserved the frequency band from 5.15 GHz to
`
`5.825 GHZ.
`
`In accordance with the invention a control station is provided which controls
`
`the alternate use of the common frequency band of the two radio interface standards.
`
`The control station is preferably a station that may operate in accordance with
`
`both the first and the second radio interface standard.
`
`The control of the alternate use of the common frequency band may be
`
`effected in various ways. For example, it is possible to provide certain predefinable time
`
`intervals for the use of the first and second radio interface standard and allocate the frequency
`band alternately to the first radio interface standard and then to the second radio interface
`
`standard in a kind of time-division multiplex mode.
`
`
`
`However, it is advantageous to effect the allocation by means of adaptive
`
`protocols. The common radio channel can then be utilized more effectively particularly when
`
`the demand for transmission capacity in accordance with the first and the second radio
`interface standard varies.
`
`25
`
`In the advantageous embodiment of the invention as claimed in claim 2, the
`
`control station is provided, on the one hand, for controlling the access to the frequency band
`for stations operating in accordance with the first radio interface standard. If the first radio
`
`interface standard is, for example, the HiperLAN/2 standard, the control station performs the
`
`30
`
`function of the central controller (Access Point AP) in accordance with this standard. In that
`
`case the stations of the HiperLAN/Z standard send a request for capacity to the control station
`
`and the control station allocates transmission capacity to each respective station.
`
`On the other hand, the control station is provided in an advantageous
`
`embodiment of the invention as claimed in claim 2 for releasing the common frequency band
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`t
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`PHDE00023 8
`v
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`4
`
`29.03.2002
`
`for access by stations operating in accordance With the second radio interface standard, if
`
`stations operating in accordance with the first radio interface standard do not request access
`
`to the frequency band. In this advantageous embodiment of the invention the first radio
`
`interface standard is given priority over the second radio interface standard in this manner.
`
`5
`
`The release of the common frequency band for the second radio interface standard may be
`
`effected, for example, explicitly by the sending of control information to the stations of the
`second radio interface standard.
`
`Alternatively, it is possible, for example, that the point coordinator provided in
`
`accordance with the IEEE802.1 1a standard operates as the central control station and controls
`
`10
`
`the alternate access of stations of the first and second radio interface standard to the common
`
`
`
`frequency band. In this advantageous embodiment of the invention the point coordinator
`
`could for example periodically render the common frequency band available to another radio
`
`interface standard, for example, to the HiperLAN/2 standard.
`
`In the advantageous embodiment as claimed in claim 3, the control is effected
`
`in that the control station determines the respective duration in which the stations operating in
`
`accordance with the second radio interface standard can utilize the common frequency band.
`
`Determining the duration may advantageously be effected as claimed in claim 4 in that the
`
`control station sends a broadcast signal which informs the stations of a time period in which
`
`the frequency band can be used by stations operating in accordance with the second radio
`interface standard.
`
`It is an advantage of the invention that when radio systems are operated in
`
`phases in which no information is sent or received by a radio station in accordance with a
`
`first radio interface standard, the additional sending of information in accordance With
`
`another radio interface standard becomes possible, so that the access to the radio channel can
`
`25
`
`be controlled by competing radio systems.
`
`It is then possible for a first radio station operating in accordance with a first
`
`radio interface standard to additionally carry out certain functions described in a second radio
`
`interface standard, while the first radio station or a coordinating filrther radio station that
`
`transmits in accordance with the first radio interface standard determines the beginning and
`
`30
`
`duration of the phase that may be used by the first station for transmission in accordance with
`
`the second radio interface standard.
`
`Depending on the radio interface standard, beginning and duration can be
`
`defined only approximately, while the respective standards are violated regularly or from
`
`time to time. The first station may preferably end the phase during which it transmits in
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`PHDE00023 8
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`“
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`5
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`29.03.2002
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`accordance with the second radio interface standard, while disregarding resulting interference
`
`in stations operating in accordance with the second radio interface standard.
`
`The first radio station may, in addition to functions in accordance with the
`
`second radio interface standard, also carry out functions that cause radio systems working in
`accordance with the second radio interface standard or radio systems working in accordance
`
`5
`
`with the first radio interface standard to interpret the radio channel as interfered and occupy
`another radio channel for its own operation.
`
`The efficient common use of a radio channel by different radio systems may
`be achieved via a suitable control protocol method. Such a radio interface control protocol
`10 method enables a first station of a radio system working in accordance with the first radio
`
`interface standard to control the access times to the radio channel by other stations. For this
`
`purpose this first station then has to carry out functions described in another, second radio
`
`interface standard in addition to the functions laid down by its own first radio interface
`
`standard at times at which stations working in accordance with the first radio interface
`
`standard do not send and do not expect information in accordance with the standard from the
`
`first station, while the first station or a further station determines the duration for which the
`
`first station is allowed to transmit in accordance with the second radio interface standard. The
`
`duration of the operation in accordance with the second radio interface standard need not be
`
`determined exactly but may also be determined approximately. A transmission in accordance
`
`with the first radio interface standard can provide that the first station terminates the use of
`
`the radio interface in accordance with the second radio interface standard without taking
`resulting interference into account in stations that send in accordance with the second radio
`interface standard.
`
`
`
`The object of the invention is achieved for the network by a wireless network
`
`25
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`that has at least one frequency band that is provided for the alternate use by a first and a
`
`second radio interface standard, while the wireless network comprises stations that work in
`
`accordance with the first and/or the second radio interface standard, a control station being
`
`provided which controls the alternate use of the frequency band.
`
`30
`
`Several examples of embodiment of the invention will be further explained
`below with reference to the drawing in the Figs. 1 to 3, in which:
`
`Fig. 1 shows the frame structure in accordance with the ETSI BRAN
`
`HiperLAN/2 standard,
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`‘
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`PHDEO 0023 8
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`Fig. 2 gives a diagrammatic representation of the access to a radio channel in
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`6
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`29.03.2002
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`systems in accordance with the IEEE802.11a standard, and
`
`Fig. 3 shows two Wireless local area networks in accordance with a first and a
`
`second radio interface standard.
`
`Fig. 1 shows the structure of the HiperLAN/Z-MAC frame.
`
`Fig. 2 diagrammatically shows the media access in systems working in
`accordance with the radio interface standard IEEE802.11a.
`
`In a HiperLAN/2 system the central controller can be controlled via the
`
`10
`,
`
`Access Point (AP) which periodically generates the MAC frame and then transmits the data
`ofthe broadcast phase to individually control the service quality (packet delay sending rate
`and so on) of individual links.
`
`
`
`Transmission in Figs. 1 and 2 with respect to the associated standards is
`
`understood to mean that a HiperLAN/2 AP in a partially unused downlink, uplink and direct-
`
`mode phase could dispense with sending useless (dummy) information and giving 802.11-
`
`systems no opportunity to observe an unused channel for a period of time SIFS and starting
`the run as shown in Fig. 2. The AP could readily regain the control in which the transmission
`
`in accordance with the HiperLan/2 standard does not suppress the broadcast phase, but
`
`transmission takes place. Likewise, the function PCF of the 802.11 standard could be used to
`
`occasionally render the radio channel available to HiperLAN/2 systems with a time limit
`
`(periodically).
`
`The altemate control of radio systems of different standards, which control is
`
`proposed here and discussed with respect to an example of the wideband LANs ETSI BRAN
`
`HiperLAN/2 and IEEE802.11a, may guarantee in a heterogeneous environment in which
`
`25
`
`various radio systems simultaneously transmit very close together in the same spectrum, a
`decentrally controlled adaptivity relative to the transmission capacity available in the
`
`respective systems for the management of the respective current traffic supply, of the
`
`required service quality and of the environment of use. When the integrated controller in
`
`accordance with the invention is used, different radio systems may be made compatible in the
`way that they constructively coexist in the same frequency band and then can provide
`
`30
`
`services that require a high service quality. The radio spectrum is clearly used more
`
`efficiently; without the implementation of the new method this is only possible with
`respective exclusively used radio channels.
`
`Fig. 3 diagrammatically shows two wireless local area networks.
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`PHDE000238
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`7
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`29.03.2002
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`U1
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`10
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`
`
`25
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`A first wireless local area network comprises three stations 10, 11 and 12.
`
`These three stations 10, 11 and 12 work in accordance with the first radio interface standard
`
`A, for example, in accordance with the HiperLAN/2 standard.
`
`A second wireless local area network includes four stations 14, 15, 16 and 17.
`
`These four stations 14, 15, 16 and 17 work in accordance with the second radio interface
`
`standard B, for example, in accordance with the IEEE802.11a standard.
`
`The stations may be, for example, computers which include a radio interface.
`
`The communication between the individual stations is effected in a wireless fashion, for
`example, by radio.
`
`For Wireless local area networks in accordance with the HiperLAN/2 and
`IEEE802.11a standards the frequency band is comprised between 5.15 GHz and 5.825 GHz.
`
`A central control station 13 is provided which controls the alternate access by
`the first wireless network and the second Wireless network to the common frequency band.
`This may be effected in an advantageous manner in that the station 13 sends a
`broadcast message to the stations 14 to 17 of the IEEE802.1 la standard when the stations 10
`
`I
`
`to 12 do not need transmission capacity. This broadcast message preferably contains time
`information which informs the stations 14 to 17 of the IEEE802.11 standard how long they
`are allowed to utilize the common frequency band. During this time the control station 13 can
`also carry out functions in accordance with the IEEE802.11a standard, for example, also be
`used for data transmission in accordance with the IEEE802.1 1a standard.
`
`If the stations 10 to 12 of the first wireless network are HiperLAN/2 stations,
`the control station 13 preferably also operates as the central control station (Access Point) of
`the HiperLAN/2 network and co—ordinates its radio resources. In HiperLAN/2 systems it is
`planned beforehand at what time the stations are allowed to send. For this purpose the
`HiperLAN/2 systems have a central controller (Access Point, AP) which receives the
`
`requests for capacity from the various stations and assigns capacity accordingly. The central
`control station 13 is preferably also provided for carrying out the function of the access point
`of the HiperLAN/2 standard. The central control station 13 then periodically signals every 2
`ms the MAC frame structure in accordance with the requirements of the individual stations of
`
`30
`
`the HiperLAN/2 network.
`
`Alternatively, it is also possible, however, in HiperLAN/2 systems for the
`function of the access point and the function of the alternating control of the access to the
`
`common frequency band by the first wireless network and the second Wireless network to be
`
`realized in separate stations. In that case, however, with respect to the duration in which the
`
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`‘
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`PHDE00023 8
`
`8
`
`29.03.2002
`
`frequency band can be utilized by the first or second radio interface standard a data exchange
`
`is necessary between these separate stations.
`
`Alternatively, it is possible, for example, for the point co—ordinator provided in
`
`accordance with the IEEES 02.11 standard to operate as a central control station and to
`
`5
`
`control the alternate access to the common frequency band by stations of the first and second
`
`radio interface standards. In this embodiment the point co-ordinator would, for example,
`
`periodically render the common frequency band available to another radio interface standard,
`
`for example, to the HiperLAN/2 standard.
`
`
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`a
`
`PHDE00023 8
`
`CLAIMS:
`
`9
`
`29.03.2002
`
`1.
`
`An interface-control protocol method for a radio system which has at least one
`
`frequency band that is provided for the alternate use by a first and a second radio interface
`
`standard, the radio system comprising stations which operate in accordance with a first radio
`
`interface standard and/or a second radio interface standard, a control station being provided
`
`,5
`
`which controls the alternate use of the frequency band.
`
`2.
`
`A method as claimed in claim 1, characterized in that the control station
`
`controls the access to the frequency band for stations working in accordance with the first
`
`radio interface standard and in that the control station renders the frequency band available
`
`for access by the stations working in accordance with the second radio interface standard if
`
`stations working in accordance with the first radio interface standard do not request access to
`
`the frequency band.
`
`3.
`
`A method as claimed in claim 1, characterized in that the control station
`
`determines the respective duration in which the stations working in accordance with the
`
`second radio interface standard are allowed to utilize the frequency band.
`
`
`
`4.
`
`A method as claimed in claim 1, characterized in that the control station sends
`
`a broadcast signal informing the stations of a time duration in which the frequency band can
`
`20
`
`be used by stations working in accordance with the second radio interface standard.
`
`5.
`
`A method as claimed in claim 3, characterized in that the duration of operation
`
`in accordance with the first and second radio interface standards is laid down only
`
`approximately while the respective standards are violated regularly or from time to time.
`
`25
`
`6.
`
`A method as claimed in claim 1, characterized in that the control station
`
`terminates the use of the radio interface in accordance with the second radio interface
`
`standard by transmitting in accordance with the first radio interface standard, without taking
`
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`‘
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`PHDE00023 8
`
`account of resulting interference in stations working in accordance with the second radio
`interface standard.
`
`10
`
`29.03.2002
`
`7.
`
`A method as claimed in claim 1, characterized in that the control station
`
`5
`
`controls the access to the frequency band by stations working in accordance with the first
`
`radio interface standard and in that duration and type of control of the radio interface in
`
`accordance with the second radio interface standard is determined by a further station and
`transmitted to the control station.
`
`10
`
`8.
`
`A method as claimed in claim 1, characterized in that the control station, in
`
`addition to functions in accordance with the second radio interface standard, also carries out
`
`functions which cause radio systems in accordance with the second radio interface standard
`
`to interpret the radio channel as interfered and to seize another radio channel for its own
`
`
`
`operation.
`
`9.
`
`A method as claimed in claim 1, characterized in that the control station also
`
`carries out functions which cause radio systems in accordance with the first radio interface
`
`standard to interpret the radio channel as interfered and to seize another radio channel for its
`
`own operation.
`
`10.
`
`A wireless network comprising at least one frequency band provided for the
`
`alternate use by a first and a second radio interface standard, the wireless network comprising
`stations which work in accordance with a first radio interface standard and/or in accordance
`
`with a second radio interface standard, a control station being provided which controls the
`
`25
`
`alternate use of the frequency band.
`
`11.
`
`A control station for a wireless network, the control station being provided for
`
`controlling the alternate use of a frequency band by stations which work in accordance with a
`
`first radio interface standard and stations which work in accordance with a second radio
`interface standard.
`
`30
`
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`,
`
`‘ ~
`
`PHDE000238
`
`ABSTRACT:
`
`11
`
`29.03.2002
`
`The invention relates to an interface-control protocol method for a radio
`
`system, which has at least one frequency band provided for the two-way alternate utilization
`
`of a first and a second radio interface standard. The radio system comprises a number of
`
`stations, which each fimction in accordance with a first radio interface standard and/or in
`
`5
`
`accordance with a second radio interface standard, in which a control station is provided that
`
`controls the two-way alternate utilization of the frequency band.
`
`Fig. 3
`
`
`
`Ex. 1002 / Page 13 of 293
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`Ex. 1002 / Page 13 of 293
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`

`

`0 l g 8 g 9 5 g
`INVENTORIBERNHARD WALKE ETAL
`Attorney Dockfl: PHDE 000238
`Title : METHOD, NETWORK AND CONTROL SYSTEM FOR THE TWO-WAY ALTERNATE CONTROL OF
`RADIO SYSTEMS OF DIFFERENT STANDARDS IN THE SAME FREQURNCY BAND
`Comm: Russell Gross 914) 333-963}
`
`1/3
`
`DirectLink,UplinkPhases
`
`
`
`BroadcastPhase
`
`MACFrame
`
`an
`
`EEu
`
`.0<2
`
`MACFrame
`
`Zeit
`
`
`
`
`
`
`
`Access Downlink,
`
`Random
`
`FIG.1
`
`Ex. 1002 / Page 14 of 293
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`Ex. 1002 / Page 14 of 293
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`

`

`INVENTOR: BERNHARD WALKE ET AL
`MW @12957:2 \x’il‘
`Attorney Docket: PHDE 000238
`Tide : METHOD, NETWORK AND CONTROL SYSTEM FOR THE TWO-WAY ALTERNATE CONTROL OF
`RADIO SYSTEMS OF DIFFERENT STANDARDS IN THE SAME FREQURNCY BAND
`Conan: Russell Gross 914) 333-9631
`
`‘<u
`v!
`
`2/3
`
`(D
`3
`
`&C
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`6Q
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`ELL.
`
`E(D
`
`(D
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`________
`
`sendende
`
`Funkstation
`
`empfangendeFunkstation
`
`
`
`sendendenStation
`
`
`
`Funkstationnaheder
`
`
`
`
`
`FunkstationenderempfangendenaheStation
`
`Ex. 1002 / Page 15 of 293
`ERICSSON v. UNILOC
`
`D
`NAV
`
`f’Lfi>cn<
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`.Q)
`'CC
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`(I)
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`Z a
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`Sendepause.
`
`Ex. 1002 / Page 15 of 293
`ERICSSON v. UNILOC
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`

`

`:6
`f‘
`7’
`__
`m ,1:
`\
`if I? f ,3 ‘3 3‘) Q 9 5 9
`INVENTORzfiERNHARD WALKE ETAL
`“J z. /
`AmmeyDocket: PHDE 000238
`Title; : METHOD. NETWORK AND CONTROL SYSTEM FORTH'E. TWOJVAY ALTERNATE CONTROL OF
`RADIO SYSTEMS OF DIFFERENT STANDARDS IN THE SAME FREQUENCY BAND
`Contact: Russell Gross 914) 333-9631
`
`3/3
`
`10
`
`12
`
`
`
`17
`
`FIG. 3
`
`Ex. 1002 / Page 16 of 293
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`Ex. 1002 / Page 16 of 293
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`

`

`‘
`
`;
`
`,
`
`ATTORNEYS DOCKET
`‘ COMBINED DECLARATION FOR PATENT APPLICATION AND POWER OF ATTORNEY
`NUMBER
`,5 (includes Reference to PCT International Applications)
`
`L PHDE000238 US
`
`s As a below named inventor, I her