`
`«a JK Patent Application «GB «2282 730 isA
`
`(21) Application No 9320814.8
`
`(22) Date of Filing 08.10.1993
`
`(71) Applicant(s)
`Nokia Telecommunications OY
`
`(Incorporated in Finland)
`
`Makkylan Puistotie 1, SF-02600 Espoo,Finland
`
`Nokia Mobile Phones Limited
`
`(Incorporated in Finland)
`
`P.O. Box 86, SF-24101 Salo, Finland
`
`(72)
`
`Inventor(s)
`John Byrne
`Teuvo Jarvela
`Sanna Maenpaa
`
`
`
`(43) Date of A Publication 12.04.1995
`
`(51)
`
`INTCL®
`HO040 7/38
`
`(52) UKCL(Edition N)
`H4L LOSC L1H10 L1H3
`
`(56) Documents Cited
`GB 2225512 A
`
`WO 93/16560 A
`
`(58)
`
`Field of Search
`UK CL (Edition L) H4K KYX KY¥4 KY4D KY4D14 KY4D8
`KY4P , H4L LDSD
`INT CL’ Ho40 7/04
`ONLINE : WPI
`
`(74) Agent and/or Address for Service
`Frank B Dehn & Co
`Imperial House, 15-19 Kingsway, LONDON,
`WC2B 6UZ, United Kingdom
`
`(54) Handover procedure in a dual-mode telecommunication network
`
`(57) A dual mode terminal 20 comprises a combined mobile station 21 and a cordless telephone 22 and may
`communicate with both a base station of a mobile radio system and a basestation of the cordless telephone
`system. In a terminal initiated handover of a call from the cordless telephone system to a base station of the
`mobile radio system, the cordless telephone part obtains from the mobile station measurements of received
`signal strengths of the mobile system basestations in the neighborhood. These are forwardedvia a base
`station of the cordless telephone system to the mobile exchangeof the mobile system in a handover request
`message. The mobile exchange selects a suitable base station for handover based on the measurements and
`informs the mobile station part of the terminal about the identity of the selected base station via the cordless
`telephonepart.
`
` CONTROL
`
`22
`
`
`
`
`UNIT
`
`FIG. 2
`
`The print reflects an assignment of the application under the provisions of Section 30 of the Patents Act 1977.
`
`
`
`VO0€&Z£72822AD
`
`SAMSUNG 1069
`SAMSUNG1069
`SAMSUNG v. SMART MOBILE
`SAMSUNG v. SMART MOBILE
`IPR2022-01004
`IPR2022-01004
`
`1
`
`
`
`Tz
`
`
`
`—
`DECT = CJ
`
`
`PUBLIC
`
`FP
`
`OFFICE
`
`RADIO
`INTERFACE
`
`os
`
`GSM/
`DECT
`
`DUAL MODE
`Tz TERMINAL
`PUBLIC
`
`2
`
`
`
`22
`
` CONTROL
`
`UNIT
`
`FIG. 2
`
`1)IMM_
`
`INFO REQ
`
`2) DM_H/O REQ
`
`a
`
`3)
`
`H/O REQ
`_FH/O ACK
`\_OM HO CMD 5)
`
`MM INFO ACCEPT I=§
`|| pays INFO
`|
`| 0lwo COM
`
`7)_HIO ACCESS
`
`°
`
`4)
`
`FIG. 3
`
`3
`
`
`
`1
`
`2282730
`
`10
`
`ED
`
`20
`
`Dual mode subscriber terminal and a handover procedure of
`
`the dual mode subscriber terminal
`
`in a mobile telecom-
`
`munication network
`
`The invention relates to a mobile telecommunica-
`
`tions system including a fixed network comprising mobile
`exchanges, base stations for mobile stations, and cordless
`telephone base stations connected to and under control of
`said mobile
`exchanges.
`In particular,
`the
`present
`
`invention relates to a method for performing handover from
`the cordless telephone base stations to base stations for
`mobile stations.
`
`Conventional cordless telephones operate as an ex-
`tension to the Public Switched Telephone Network (PSTN). A
`cordless telephone system consists of a portable handset
`and a base station (a fixed part) connected to PSTN. The
`
`first cordless telephone systems were analog systems, such
`as CT1. Recently digital cordless telephone systems, such
`as CT2 and DECT (Digital European Cordless Telephone) have
`been intreduced. When a cordless telephone is a subscriber
`
`of PSTN,
`
`a cordless telephone is accessed by dialing the
`
`fixed subscriber
`telephone number associated with the
`connection to which the base station is connected. Also
`
`the subscriber has access to the PSTN only via the home
`
`base station. In CT2 and DECT, also a telepoint service is
`introduced, whereby subscriber to the service can make
`calls away from home via a public base station. Also a
`
`common air interface for cordless telephones was introdu-
`
`ced to facilitate roaming between systems and so to impro-
`
`30
`
`ve service coverage for the use.
`
`dless
`
`There has also been a proposal to combine a cor-
`telephone
`system with
`a
`cellular mobile
`
`telecommunications system to further improve the roaming
`
`35
`
`the mobility
`capabilities by means of utilization of
`control of
`the cellular network. When combined with the
`
`4
`
`
`
`the
`the roaming of
`systems,
`mobile telecommunications
`cordless telephone handsets within the cordless telephone
`systems
`is
`fully supported. However,
`the
`cordless
`
`is not
`telephone handset
`to utilize the more
`able
`extensive
`radio coverage
`of
`the supporting cellular
`network or to perform handover to or from the cellular
`network. This disadvantage is due to several reasons.
`
`of cordless te-
`the radio interfaces
`Firstly,
`lephone systems and the mobile radio systems are usually
`
`incompatible.
`the handover procedures are different. In
`Secondly,
`cordless
`telephone systems,
`the handover procedure is
`usually
`initiated by
`the
`portable
`terminal. More
`particularly, when a cordless telephone terminal considers
`it necessary to change from one base station to another,
`
`the terminal scans the frequency band and selects the
`appropriate base station for the handover.
`In most of the
`mobile telephone systems the handover is controlled by the
`network. The mobile station only measures the quality of
`
`the radio connection and forwards the measuring results to
`the
`fixed network. One cf
`the networn elements,
`for
`
`example a mobile exchange, makes a decision for handover
`on the basis of the obtained information.
`
`It is an object of the invention =5 provide a sub-
`th
`
`communicating with both a
`terminal capable cf
`scriber
`fixed part of a cordless telephone system and a base sta-
`
`tion of the mobile radio system.
`
`It is a further object of the invention to provide
`
`a method for performing handover from a fixed part of a
`
`cordless telephone system to a hase station of a mobile
`telecommunications system.
`
`One aspect of the invention is,
`in a mobile tele-
`communications system including a fixed network comprising
`mobile exchanges, first base stations connected to said
`mobile exchanges, and second base stations of a cordless
`
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`5
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`
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`telephone system, said second base stations being connec-
`ted to and under control of said mobile exchanges, dual
`mode subscriber terminals having a mobile station part for
`radio communication with said first base stations and a
`
`cordless telephone part for radio communication with said
`second base stations;
`a method for performing handover
`from one of said second base stations to one of said first
`
`base stations, comprising the steps of
`
`measuring field strengths of
`
`said first base
`
`stations at said mobile station part of said dual mode
`terminal and storing measurement results,
`
`detecting low quality of connection between one of
`
`said second base stations and said cordless telephone part
`of said dual mode terminal during an on-going call,
`
`obtaining the stored measurement results from said
`
`mobile station part
`
`to said cordless telephone part of
`
`said dual mode terminal,
`
`sending a message including said obtained measure-
`ment results and terminal
`identity to said one of said
`
`second base stations by said cordless telephone part of
`said dual mode terminal,
`
`sending a handover request message from said one of
`said second base stations to one of said mobile exchanges
`in response to receipt of said message including said
`
`request message
`handover
`said
`results,
`Measurement
`including said terminal
`identity and said measurement
`results,
`
`selecting one of said first base stations on the
`
`basis of said measurement results,
`
`sending a handover command message to said one of
`said second base stations from said one of said mobile
`
`exchanges, said message including the information of said
`
`selected one of said first base stations,
`sending a message to said cordless telephone part
`of said dual mode terminal
`from said one of said second
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`
`
`
`base stations, said message including information of said
`
`selected one of said first base stations,
`
`forwarding said information of said selected one of
`said first base stations to said mobile station part from
`said cordless telephone part of said dual mode terminal,
`establishing a connection between said mobile sta-
`tion part of said dual mode terminal and said selected one
`of said first base stations,
`
`releasing said connection between said cordless
`telephone part of said dual mode terminal and said one of
`said second base stations.
`
`Another aspect of the invention is a mobile tele-
`communications system including a fixed network comprising
`mobile exchanges, first base stations connected to said
`mobile exchanges and second base stations of a cordless
`telephone
`system,
`said
`second
`base
`stations
`being
`connected to and under control of said mobile exchanges; a
`
`dual mode subscriber terminal comprising
`
`a mobile station part for radio communication with
`
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`20
`
`said first base stations,
`
`a cordless telephone part for radio communication
`with said second base stations,
`
`means for measuring field strengths of said first
`base stations at said mobile staticn part of said dual
`
`mode terminal and storing measurement results,
`
`means for monitoring quality of connection between
`said second base
`stations
`and
`said cordless
`
`one of
`
`telephone part of said dual mode terminal during an on-
`going call,
`
`means for requesting said stored measurement re-
`sults from said mobile station part
`to said cordless te-
`
`lephone part of said dual mode terminal
`detecting low quality of said connection,
`means for sending a message including said obtained
`measurement results and a terminal identity to said one of
`
`in response to
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`7
`
`
`
`said second base stations from said cordless telephone
`part of said dual mode terminal,
`means for receiving a message at said cordless te-
`lephone part of said dual mode terminal
`from said one of
`said
`second
`base
`staticns,
`said message
`including
`information on the one of said first base stations which
`
`is selected for handover,
`
`means for forwarding said information of said se-
`lected one of said first base stations to said mobile
`
`from said cordless telephone part of said
`station part
`Qual mode terminal so as to establish a connection between
`
`said mobile station part of said dual mode terminal and
`said selected one of said first base stations.
`
`In the invention, a dual mode terminal is utilized,
`
`in which a mobile station of a mobile radio system and a
`
`cordless telephone are combined. This xind of terminal can
`have a connection with both a base station of
`the mobile
`
`radio system and a fixed part of
`
`the cordless telephone
`
`system. Handover
`
`in the case of
`
`this dual mode terminal
`
`can imply the transfer of a call from a fixed part of the
`cordless telephone system to a base station of the mobile
`radio system. As noted before,
`the primary problem in this
`concept is that two systems utilizing different handover
`principles
`are
`combined.
`In
`the
`cordless
`telephone
`
`systems,
`
`such as DECT, handover is a terminal controlled
`
`procedure and the terminal will make a decision when the
`
`such as
`In the mobile radio system,
`is needed.
`handover
`GSM,
`the network will always decide when to perform a
`handover.
`
`In the present
`
`invention the cordless telephone
`
`part of the dual mode terminal will initiate the handover
`procedure from a cordless telephone system to a mobile
`radio system, when the cordless telephone part of the dual
`
`mode terminal recognizes that the quality of connection is
`getting worse and the mobile radio system could offer a
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`8
`
`
`
`better connection. In order to carry out a proper handover
`procedure,
`the cordless telephone part obtains from the
`mobile station part of
`the terminal measurement results
`relating to received signal strength of the mobile system
`base stations in the neighborhood. The cordless telephone
`part of the terminal forward these measurement results via
`a fixed part of
`the cordless telephone system to the
`mobile exchange of the mobile system in a handover request
`message. The mobile exchange selects a proper base station
`for a handover and informs the cordless telephone part of
`the terminal about
`the identity of
`the selected base
`station via the fixed part of the cordless telephone sys-
`
`tem. The cordless telephone part of the terminal forwards
`
`the base station to the mobile station
`the identity of
`part of the terminal which initiates an establishment of a
`connection with the selected base station. After the esta-
`
`blishment of the connection is completed the mobile stati-
`on part informs the cordless telephone part about the mat-
`
`ter and the latter releases the radio path of the cordless
`
`the invention allows a terminal
`telephone system. Thus,
`initiated handover from a cordless telephone system to a
`mobile system which utilizes a network initiated handover
`
`procedure.
`
`The description of the preferred embodiments of the
`invention will now be made with reference to the attached
`
`in which
`drawings,
`Figure 1 shows a general diagram of a mobile radio
`system which supports a cordless telephone systems,
`Figure 2
`shows a general diagram of a dual mode
`subscriber terminal according the invention, and
`Figure 3
`is a signalling diagram for the handover
`method according to the invention.
`
`In the following the invention will be described
`using digital cellular radio system known as GSM (Groupes
`Speciale Mobile) as an example of the mobile radio system
`
`i5
`
`20
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`25
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`30
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`35
`
`9
`
`
`
`and DECT (Digital European Cordless Telephone) as an exam-
`
`the invention
`ple of cordless telephone systems. However,
`is not
`intended to be restricted to these systems. The
`invention may be applied to any mobile radio system.
`of
`Figure
`1
`shows
`the
`functional
`environment
`GSM/DECT dual mode terminal.
`In figure 1, both base stati-
`
`ons BSS of GSM system and fixed parts FP of DECT system
`are connected to the GSM mobile exchange MSC. One of the
`
`DECT fixed parts FP is shown to be connected to the
`private branch exchange PBX which is further connected to
`
`PSTN
`the MSC. The MSC may be connected to other MSC:s,
`(Public Switched Telephone Network) or
`ISDN (Integrated
`Services Data Network). The MSC is also connected to the
`
`visitor location register VLR, which is a data base main-
`taining subscriber files on the subscribers visiting in
`the area of the MSC, and to a home location register HLR
`which is a data base maintaining subscriber files on all
`
`the
`
`subscribers
`
`in the
`
`system,
`
`and
`
`further
`
`to an
`
`identity
`authentication center AC and to an equipment
`register EIR. For more detailed description of the cpe-
`ration and structure of GSM system, a reference is made to
`
`GSM specifications and to a book "The GSM system for mobi-
`
`le communication", M. Mouly and M. Pautet, Palaiseau,
`France,
`ISBN:2 9507190-0-7.
`
`Figure 2
`
`shows a general view of a SSM/DECT dual
`
`mode subscriber terminal according to the invention. The
`terminal 20 consists of a GSM mobile station part MS 21
`and a DECT portable terminal part PP 22. The GSM part of
`the dual mode terminal MS is used when communicating with
`GSM base stations. The DECT part PP of
`the dual mode
`terminal is used when communicating with DECT fixed parts
`FP. Both MS and PP include all
`the necessary equipment,
`such
`as
`radio
`transceivers,
`for
`signalling
`and
`communicating over the respective radio interface.
`It is
`normally advantageous to embody at
`least
`some functions
`
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`
`
`such as display, keyboard, power supply,
`and circuits,
`etc., by means cf a common circuitry.
`In Fig. 2, a common
`control unit 23 is connected to MS and PP parts of
`the
`dual mode terminal for controlling the operation thereof.
`The GSM network provides a full mobility management
`support for the cordless telephone systems connected to
`it. Thus,
`the GSM network maintains files on the cordless
`
`telephone subscribers and the current location thereof and
`is therefore able to route the calls addressed to the cor-
`
`diess telephone to their current locations. Basically,
`
`the
`
`cordless telephone subscribers are handled in a similar
`
`manner with the ordinary GSM subscribers.
`Thus,
`the dual mode terminal according to the in-
`vention is capable of communicating with both GSM base
`stations and DECT base stations (fixed parts) FP. Con-
`
`sequently, a dual mode
`
`terminal should also be able to
`
`roam anywhere in the system. However, problems are encoun-
`
`(or vice ver-
`tered when the handover from DECT fixed part
`sa)
`is required, since in the DECT system handover
`is a
`ct
`Os
`terminal controlled procedure and
`the terminal will make a
`decision when the handover
`is needed.
`In the GSM system
`
`network will always decide when to perform a handover.
`An example of
`the handover precedure according to
`the invention from DECT fixed part to the GSM base s
`
`will be described in the following with reference to figu-
`
`it is assumed that the cordless telephone
`re 3. Firstly,
`part PP of
`the dual mode terminal has a DECT connection
`
`and an on-going call via fixed part FP of the DECT system.
`The mobile station part MS of
`the dual mode
`terminal is
`simultaneously measuring
`the
`signal
`strength of
`the
`neighboring GSM base stations and stores the measurement
`results.
`
`In step 1 of Figure 3, when detecting durirg the
`call that the quality of connection is getting worse,
`the
`PP will start a handover procedure from the DECT system to
`
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`
`
`the GSM system. Firstly,
`the PP will request
`the stored
`measurement results from the MS part of the terminal. Af-
`ter obtaining the measurement results the handover proce-
`dure is initiated by sending a MM INFO REQuest message ac-
`cording to the DECT common interface specification (DECT
`CI)
`from the PP part of
`the terminal
`to the DECT fixed
`part FP. This message will carry the obtained measurement
`results in IWU-TO-IWU parameter. The message includes also
`
`a portable identity.
`In step 2 of the figure 3, when the DECT fixed part
`FP receives the MM-INFO-REQ message from PP part of
`the
`
`dual mode terminal, it will send a DM H/O REQuired message
`
`to the mobile exchange MSC.
`according to DSS.1+ protocol
`The DSS.1+ protocol
`is the DSS.1 protocol enhanced with
`mobility management. This message includes the following
`information elements: Portable identity, a Cause field in-
`cluding information of the dual mode handover, and IWU-TO-
`IWU parameter including the measurement results.
`In step 3 of figure 3,
`the MSC receives the measu-
`rement results in the DM H/QO REQ message from DECT fixed
`ty a-
`
`part FP. MSC decides on the basis of
`
`the measurement
`
`sults to which GSM base station BSS it should periorm
`handover. The MSC sends a H/O REQ message according
`specification GSM 08.08 to a base staticn ESS
`it
`
`ctoyOoww
`
`ou fn
`
`h
`
`to indicate that the dual mcde ter-
`selected for handover,
`minal is to be handed over to that GSM base staticn BSS.
`
`In step 4 of the figure 3, H/O ACK message accor-
`ding to the specification GSM 08.08 is sent
`from the se-
`
`lected GSM base station BSS
`to the MSC. This message
`indicates that
`the request
`to support a handover at
`the
`selected BSS can be supported by this BSS. The message
`further indicates to which radio channel
`the dual mode
`
`terminal should be directed.
`
`In step 5 of figure 3,
`
`the MSC sends a DM H/O CMD
`
`message according to DSS.1+ protocol
`
`to the DECT fixed
`
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`part FP to indicate that a handover procedure is availa-
`
`ble. Also the information of the selected GSM base station
`
`BSS is included. Thus the message includes the following
`information elements:
`a portable identity and a BSS
`
`identity.
`In step 6 the DECT fixed part FP sends to the cor-
`dless telephone part PP of the dual mode terminal a MM
`INFO ACCEPT message according to DECT CI. This message
`includes information cf the selected GSM base station BSS
`
`where handover should be done. Thus, this message includes
`
`the following information elements:
`
`IWU-TO-IWU parameter,
`
`including a BSS identity and a H/O reference.
`In step 7 the cordless telephone part PP delivers
`the identity of the selected GSM base station BSS to the
`mobile station part MS of the dual mode terminal and the
`mobile
`station part MS
`sends
`a H/O ACCESS message
`according to the specification GSM 04.08 to the selected
`GSM base station BSS.
`
`In step 8, when the selected GSM base station BSS
`receives the H/O ACCESS message from the mobile station
`ct
`par
`MS it will respond with a PHYS INFO message according
`
`to the specification GSM 04.58 to the mobile station part
`MS in order to stop sending cf access bursts from the MS
`and to activate the physical channels for the connection.
`
`In step 9 the mobile station part of the dual mode
`terminal
`sends a H/O COMPLETE message according to the
`specification GSM 08.08 to the MSC to indicate that
`the
`
`mobile station part MS of the dual mode terminal has suc-
`cessfully accessed the selected GSM base station BSS. The
`mobile station part MS of
`the dual mode
`terminal will
`inform the cordless telephone part PP of the terminal that
`
`the handover is completed and the cordless telephone part
`of the terminal can release the former DECT connection.
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`Claims
`
`1.
`
`In a mobile telecommunications system including
`
`a fixed network comprising mobile exchanges, first base
`
`stations connected to said mobile exchanges and second
`
`base stations of a cordless telephone system, said second
`base stations being connected to and under control of said
`mobile exchanges, dual mode subscriber terminals having a
`mobile station part
`for
`radio communication with said
`first base stations and a cordless telephone part
`for
`radio communication with said second base stations;
`a
`
`method for performing handover
`
`from one of said second
`
`base
`
`stations
`
`to one of
`
`said first base
`
`stations,
`
`comprising the steps of
`measuring the field strengths of said first base
`
`stations at said mobile station part of said dual mode
`
`terminal and storing measurement results,
`
`detecting low quality of connection between one of
`
`said second base stations and said cordless telephone part
`
`of said dual mode terminal during an on-going call,
`
`obtaining the stored measurement results from said
`mobile station part by said cordless telephone part of
`said dual mode terminal,
`
`sending a message including said obtained measure-
`
`ment results and a terminal
`
`identity to said one of said
`
`second base stations from said cordless telephone part of
`
`said dual mode terminal,
`
`sending a handover request message from said one of
`
`said second base stations to one of said mobile exchanges
`in response to receipt of said message including said
`measurement
`results,
`said
`handover
`request message
`including said terminal
`identity and said measurement
`results,
`selecting one of said first base stations on the
`
`basis of said measurement results,
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`12
`
`sending a handover command message to said one of
`said second base stations from said one of said mobile
`
`exchanges, said message including the information of said
`
`selected one of said first base stations,
`
`sending a message to said cordless telephone part
`of said dual mode terminal
`from said one of said second
`
`base stations, said message including information of said
`
`selected one of said first base stations,
`
`forwarding said information of said selected one of
`said first base stations to said mobile station part via
`said cordless telephone part of said dual mode terminal,
`establishing a connection between said mobile sta-
`tion part of said dual mode terminal and said selected one
`
`of said first base stations,
`
`releasing said connection between said cordless
`telephone part of said dual mode terminal and said one of
`said second base stations.
`
`2. A method according to claim 1, comprising furt-
`
`her steps of
`sending a handover request message to said selected
`one of said ‘first base stations
`from said one cf said
`
`mobile exchanges to indicate that said dual mode terminal
`
`is to be handed over to said selected bas]= station,
`
`10
`
`15
`
`20
`
`25
`
`from
`sending a handover acknowledcement message
`said selected one of said first base stations to said one
`
`of the mobile exchanges, said message indicating the radio
`channel
`to which
`the dual mode
`terminal
`should be
`
`directed.
`
`30
`
`35
`
`3. A method according to claim 1 or 2, wherein said
`step of establishing a connection comprises the steps of
`sending a handover access message from said mobile
`
`station part of said dual mode terminal
`
`to said selected
`
`one of said first base stations,
`
`sending an acknowledgement message te said mobile
`
`station part
`
`from said selected one of said first base
`
`15
`
`15
`
`
`
`13
`
`stations,
`
`sending a handover completed message to said selec-
`ted one of said first base stations from said mobile
`
`station part,
`
`sending a handover completed message from said se-
`lected one of said first base stations to said one of said
`
`mobile exchanges.
`4.
`In a mobile telecommunications system including
`
`a fixed network comprising mobile exchanges, first base
`
`Stations connected to said mobile exchanges, and second
`base stations of a cordless telephone system, said second
`base stations being connected to and under control of said
`mobile
`exchanges;
`a
`dual mode
`subscriber
`terminal
`comprising
`a mobile station part for radio communication with
`
`said first base stations,
`
`a cordless telephone part for radio communication
`with said second base stations,
`
`means
`
`for measuring the field strengths of said
`
`first base stations at said mobile station part of said
`
`dual mode terminal and storing measurement results,
`
`one
`
`of
`
`means for monitoring quality of connection between
`the
`second base
`stations
`and
`said cordless
`
`telephone part of said dual mode terminal during an on-
`going call,
`re-
`means for requesting said stored measurement
`sults from said mobile station part
`to said cordless te-
`
`terminal
`lephone part of said dual mode
`detecting low quality of said connection,
`means for sending a message including said obtained
`measurement results and a terminal identity to said one of
`said second base stations from said cordless telephone
`part of said dual mode <erminal,
`
`in response to
`
`LO
`
`L5
`
`20
`
`25
`
`30
`
`35
`
`means for receiving a message at said cordless te-
`lephone part of said dual mode terminal
`from said one of
`
`16
`
`16
`
`
`
`- 14 -
`
`said second base stations, said message including
`information on the one of said first base stations which
`
`is selected for handover,
`
`means for forwarding said information of said
`selected one of said first base stations to said mobile
`
`station part from said cordless telephone part of said
`dual mode terminal so as to establish a connection
`
`between said mobile station part of said dual mode
`terminal and said selected one of said first base
`
`10
`
`stations.
`
`S.
`A method for performing handover from one base
`station to another in a mobile telecommunications system
`
`15
`
`substantially as hereinbefore described with reference to
`the accompanying drawings.
`
`A dual mode subscriber terminal substantially as
`6.
`hereinbefore described with reference to the accompanying
`drawings.
`
`17
`
`17
`
`
`
`
`Application number
`Patents Act 1977
`GB 9320814.8
`E niner’s report to the Comptroller under Section 17
`
`(The Search report)
`
`
`Search Examiner
`Relevant Technical Fields
`N W HALL
`
`(i) UK Cl (Ed.L)
`
`H4K (KYX, KY4, 4D, 4D8, 4D14, 4P); H4L
`(LDSD)
`
`(ii) Int Cl (Ed.5)
`
`H04Q 7/04
`
`Databases (see below)
`(i) UK Patent Office collections of GB, EP, WO and USpatent
`specifications.
`
`
`
`
`8 DECEMBER 93
`
`
`Date of completion of Search
`
`
`
`Documents considered relevant
`
`following a search in respect of
`Claims :-
`1-6
`
`(ii) On-line: WPI
`
`Categories of documents
`
`X:
`
`Y:
`
`Documentindicating lack of novelty or of inventive step.
`
`Documentindicating lack of inventive step if combined with
`one or more other documents of the same category.
`
`Pr:
`
`E:
`
`Document published on or after the declared priority date
`but before the filing date of the present application.
`
`Patent document published on or afler, but with priority date
`earlier than, the filing date of the present application.
`
`A:
`
`Documentindicating technological background and/or state
`of the art.
`
`&:
`
`Meinber of the same patent family; corresponding docunicat
`
`Category
`
`Identity of document and relevant passages
`
`Relevant to
`claim(s)
`
`GB 2225512 A
`
`(MOTOROLA)
`
`WO 93/16560 Al
`
`(MOTOROLA)
`
`Databases:The UK Patent Office database comprises classified collections of GB. EP, WO and US patent specifications as outlined periodicallyin the Official J---rnitl
`(Patents). The on-line databases considered for searchare also listed periodically in the Oficial Journal (Patents).
`
`TS - 1532
`
`Page 1 of |
`
`18
`
`18
`
`
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