FI100936B - Device for method of connection in mobile communication systems during battery replacement of mobile telephones - Google Patents

Device for method of connection in mobile communication systems during battery replacement of mobile telephones Download PDF

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Publication number
FI100936B
FI100936B FI954713A FI954713A FI100936B FI 100936 B FI100936 B FI 100936B FI 954713 A FI954713 A FI 954713A FI 954713 A FI954713 A FI 954713A FI 100936 B FI100936 B FI 100936B
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FI
Finland
Prior art keywords
network
connection
mobile station
message
mobile phone
Prior art date
Application number
FI954713A
Other languages
Finnish (fi)
Swedish (sv)
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FI954713A0 (en
FI954713A (en
Inventor
Jari Schroderus
Esa Lauri
Matti Sangi
Hannu Hietalahti
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Nokia Mobile Phones Ltd
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Application filed by Nokia Mobile Phones Ltd filed Critical Nokia Mobile Phones Ltd
Priority to FI954713 priority Critical
Priority to FI954713A priority patent/FI100936B/en
Publication of FI954713A0 publication Critical patent/FI954713A0/en
Publication of FI954713A publication Critical patent/FI954713A/en
Application granted granted Critical
Publication of FI100936B publication Critical patent/FI100936B/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers; Analogous equipment at exchanges
    • H04M1/72Substation extension arrangements; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selecting
    • H04M1/725Cordless telephones
    • H04M1/72502Cordless telephones with one base station connected to a single line
    • H04M1/72505Radio link set-up procedure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02Power saving arrangements
    • H04W52/0209Power saving arrangements in terminal devices
    • H04W52/0261Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0296Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level switching to a backup power supply
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/10Techniques for reducing energy consumption in wireless communication networks according to the Radio Access Technology [RAT]
    • Y02D70/12Techniques for reducing energy consumption in wireless communication networks according to the Radio Access Technology [RAT] in 3rd Generation Partnership Project [3GPP] networks
    • Y02D70/122Techniques for reducing energy consumption in wireless communication networks according to the Radio Access Technology [RAT] in 3rd Generation Partnership Project [3GPP] networks in 2nd generation [2G] networks

Description

100936

Method for maintaining an established connection in a mobile communication system during battery replacement of a mobile station - Anordning för förvarande av förbin-delse i mobilkommunikationssystem under batteriersättning av mobilteleappa-rat 5

The invention relates to maintaining the established connection in the mobile communication system during the battery exchange of the mobile station.

10 Mobile devices are increasingly very compact battery-powered handsets. Although the trend is towards the most low-power devices, and although the operation of the devices has been developed to save as much battery power as possible, running out of batteries during use is still a common occurrence. This is, of course, also influenced by the fact that the aim is also to make the batteries as compact as possible, which means that their energy storage capacity must be compromised. The situation is most embarrassing for the user when the batteries run out during an important call and a battery change leads to disconnection.

Current mobile devices are designed so that battery replacement can be performed very quickly, in a matter of seconds, if the battery unit to be replaced is easily and quickly available. Thus, a battery replacement would not, in other words, interfere with a call or data connection if it could be performed without the connection being disconnected. In some mobile communication systems, rapid battery replacement may be performed as part of their normal operation to ensure that the connection is maintained when the radio-25 connection is temporarily lost. One such system is the Nordic NMT 900, the activities of which are discussed in more detail below. The Battery Replacement option is then based on the fact that on both the mobile device and the network side, the operation includes time control, within which the connection in the network is maintained and the temporarily lost radio connection can be restored, for example due to heavy shadows. The mobile device must then have such a function; t that it is able to return to or reconnect to the radio connection after a power failure due to battery replacement.

In the case described above, the battery is replaced without the mobile device having a function specifically defined for it and without the network being aware of what the loss of the radio connection is. Solutions specially developed for battery replacement to maintain a connection are also known in the art, one of which is disclosed in GB patent application 2 240 010. The contact information of the current connection is stored in that mobile station when an alarm is received when the battery is low. However, when the mobile station stops transmitting a monitoring signal during the battery replacement, the base station maintains the connection in the network for a predetermined time. If the battery change is performed within this time, the mobile station re-establishes the connection between it and the base station using the contacts stored in it. The disadvantage of this solution is, firstly, that it requires a rather large change in the operation of the mobile communication device. In the preferred embodiment disclosed in the publication, the mobile communication device has a separate processor for this operation and the functions built around it. Its disadvantage is also that on the side of the network 10 it is not known in this case that a battery replacement is involved. The operation on the network side must therefore be defined in such a way that the connection is maintained in the network up to the base station for a certain predetermined time after the reception of the monitoring signal of the mobile station has ceased. This time must therefore be set relatively short, and it is not certain that the battery will be replaced within 15 years.

DE-A-40 01 412 discloses a solution in connection with a cordless telephone system which makes it possible to eliminate the latter of the above-mentioned problems. The cordless phone automatically sends a specific character to the base station when the battery is removed. The base station then maintains the connection thereafter and begins to send connection establishment information to the wireless telephone on the same channel as the connection. It does this for a period of time, and if the battery is replaced during that time, the cordless phone will return to operation, it will immediately receive the necessary connection information and will be able to reconnect to the base station and the downlink it maintains.

In the NMT 900 system, the possibility to maintain the established connection during battery replacement is based on the operation of the mobile station, which is essentially in accordance with the above-mentioned publication GB-A 2 240 010. At the beginning of the call, the mobile phone always saves 30 in the so-called EPROM memory. cellular state information, which includes e.g. traffic area code and channel code. A 5-6 second time control has been implemented in the mobile phone, within the framework of which the connection from the mobile phone to the base station can be disconnected and still return to the previous connection by means of the data stored in the EPROM memory. Correspondingly, a time control of about 10 seconds is used on the base station side, during which the connection is kept from the network to the base station, even if the connection to the mobile phone is lost.

Using this mode, the battery can be replaced in the phone without losing the connection established within the 5-6 second time control. This solution has the disadvantages identified in the review of GB-A 2 240 010 above.

3,100936

The method according to the invention for maintaining a connection to or from a mobile station in a communication network, which can be divided into a radio connection between a mobile station and a network and in a network during battery exchange, is characterized by comprising the steps of: - signaling a first message to the network, indicates a forthcoming battery change, - in response to the first message, the connection is maintained in the network, 10 - the connection between the mobile station and the network is disconnected and a battery change is performed, - the mobile station signals a second message to the network stating that the battery change is complete and re-start signaling.

15

The method according to the invention is based on signaling between a mobile station and a network. In a preferred embodiment of the method according to the invention, the mobile station first sends a message to the network informing about an upcoming battery change. The network acknowledges the message with a response message, and then the connection between the mat-20 and the network is disconnected in the normal way and by proper signaling. The difference to normal operation is that the network is aware that the reason for disconnection is a battery change and that the connection from the network to the mobile station is to be re-established after a while. Thus, the network consciously keeps other connection resources on the network still reserved for the connection over the usual 25 time control applied when the connection is lost. After the battery exchange, the Kim returns to operation, it signals a message to the network, after which the connection between the network and the mobile station is re-established in the normal way and by means of a proper signal exchange between the mobile station and the network.

In another embodiment of the invention, a battery replacement message informs the network of an upcoming battery replacement and allows the radio connection between the mobile station and the network to be disconnected during the battery replacement. The information required to re-establish the radio connection has previously been stored in the mobile station. In response to the battery replacement message received, the network maintains the connection from the radio connection 35 onwards and retains the readiness to re-establish the radio connection. After replacing the batteries, the radio connection is re-established from the mobile station.

4,100936

In a preferred embodiment of the invention, the signaling indicating the replacement and end of the battery is implemented using messages and signaling procedures already defined in the system. New activity and additional attributes for messages are only needed to a small extent in implementation. For example, in the GSM system-5, which is a primary application of the invention, the implementation of the method requires only relatively minor changes and additions to the operation on both the mobile station and the network side.

The advantage of the method according to the invention over the known methods is that the battery replacement situation can be completely managed without being dependent on the time control deadlines otherwise set in the system for connection loss situations. A battery replacement function can be defined in the mobile station, and the method according to the invention is performed automatically when the user selects this function from the user interface menu. A time can be set aside for battery replacement, within which it can be easily and safely performed. As the implementation of the method does not require major changes in the operation of the network, it is easily supported by network operators. Since the method is based on the exchange of messages between the mobile station and the network, at the same time information is naturally obtained as to whether the network supports the method or not. Further, the implementation of the method in a mobile station does not preclude an attempt to replace the battery and maintain the connection within the normal operation and time control of the system if the network does not support the method of the invention.

This application uses the definition of "a traffic connection to or from a mobile station in a communications network that can be divided into a radio-to-network connection between a mobile station and a network and a connection in a network." This means that the traffic connection established in the communication network can be divided, for example, in such a way that the connection between the mobile station and the network is only a radio connection between the mobile station and the network, i.e. between a base station in the network, and on the other hand, for example, such that the connection between the mobile station and the network is a connection from the mobile station 30 to the mobile switching center or the base station controller. In all cases, connection in the network means all other connection resources in the mobile network and possibly in another network which, together with the connection between the mobile station in question and the network in question, form said traffic connection. A traffic connection is typically a call connection established between a subscriber using a mobile station 35 and another subscriber, a subscriber of a fixed or mobile network. The established connection can also be a data connection.

5,100936

The invention and its various embodiments will be described in more detail below with reference to the accompanying drawings, in which: Fig. 1 is a flow chart generally illustrating an implementation of the method 5 according to the invention, Fig. 2 is a schematic diagram generally illustrating the method and associated signaling, Figs. ) and 3 (b) are signaling diagrams illustrating signaling according to the method of the invention, Fig. 4 is a signaling diagram illustrating an embodiment of the method according to the invention.

Figure 1 shows a flow chart of a possible implementation of the method according to the invention. The normal operation of the mobile station is to give an alarm to the user 15 when only a small part of the battery charge remains. When the low battery alarm comes on while a call or data connection is active, the method according to the invention can be applied to maintain the connection over battery replacement. In a preferred embodiment of the invention, battery replacement can be selected from the on-call menu of the mobile station user interface in step 2 of the flowchart of Figure 1.

In this case, in step 3, the mobile station signals to the network a message indicating an upcoming battery replacement. The action that triggers the method can, of course, be more than a selection using a menu. It can be a specific key action, or it can be implemented to happen automatically. Since the method according to the invention is based on signaling between a mobile station and a network, it only works if the network with which the mobile station communicates supports the method. The battery replacement signaling message and its transmission method are preferably implemented so that if the network in step 4 does not support the method, in step 5 it responds with a status message indicating that it did not understand the transmitted message and otherwise ignores the message. The application of the method then ends in step 12 30 here. Such a functional definition is advantageous to ensure compatibility with existing network implementations and to allow the battery replacement function to be implemented in networks as an option. If the network supports the battery replacement function in step 4, it responds to the battery replacement message in step 6 with an acknowledgment. The connection between the mobile station and the network is then disconnected in step 7, preferably using the normal Signa-35 creation procedure. At the same time, however, the network, which is now aware that a battery change is being performed in that mobile station, keeps other connection resources reserved for the connection. The network can also provide information about the cause of the interruption to the other party of the connection. In step 8, the user performs the battery replacement. Upon completion of the battery exchange 6 100936, in step 9, the mobile station signals to the network a message that initiates signaling to re-establish the connection between the network and the mobile station. In step 10, the network and the mobile station continue signaling to re-establish the connection. The signaling of steps 9 and 10 may be a completely normal sig-5 signaling of the ice system, which starts automatically when the mobile station becomes active after battery replacement. The signaling options are discussed in more detail below. In step 11, the connection between the network and the mobile station is re-established, and the operation continues with the stored connection normally.

The signaling and connection diagram of Figure 2 illustrates the operation according to the method of the invention. The mobile station MS of the subscriber A is connected to the subscriber B via the network MN. The connection consists of a connection 21 between the mobile station MS and the network MN and a connection 22 in the network, which here means all other connection resources between subscribers A and B. When the battery change occurs, the mobile station MS 15 notifies the network MN with a message 23, which the network MN acknowledges with a message 24. The signaling between the mobile station MS and the network MN then continues to disconnect them, ending with a message 26, which may be a message that the network and the mobile station the disconnection between is completed. Connection 21 is now disconnected, but other connection resources 22 in the network are still kept 20 reserved. Block 27 surrounded by a dashed line indicates that battery replacement has been performed. When the battery replacement is completed, the mobile station MS sends a message 28 to the network, and then the signaling between the mobile station MS and the network MN to establish a connection between them resumes, ending with the signaling message 29. The connection 21 is now re-established. connection between subscribers A and B maintained over battery replacement.

Figures 3 (a) and 3 (b) are signaling diagrams showing generally the signaling essentially part of the method according to the invention. The signaling according to the invention is started by a message 31 from the mobile station MS informing the network MN of a battery change 30. The network MN acknowledges this message with a message 32. Now *: the network MN is aware that a battery change is being performed in this mobile station and the mobile station is aware that the network supports battery change. Thereafter, the connection between the network and the mobile station is disconnected or disconnected, and the user performs the battery replacement as shown in block 33. After the battery change 35, the mobile station MS starts signaling to re-establish the connection by saying 34, which at the same time notifies the network MN that the battery change in that mobile station has been completed. The message 34 indicating the end of the battery replacement may be a request to reconnect, and the network MN may respond with a message 35 indicating that the request has been accepted.

Figure 3 (b) shows signaling in the case where the network does not support the battery replacement function. In this case, the network MN responds to the battery replacement message 31 with a status message 36 indicating that it did not understand the message it received. The mobile station and its user are now aware that the battery cannot be replaced in such a way that the connection is maintained.

In the following, alternatives for implementing the method according to the invention in a GSM mobile communication system or PCN and DCN signaling systems with similar signaling, which are the primary applications of the method according to the invention, will be considered. The signal diagram of Figure 4 shows a possible implementation. In it, the battery change message 41 is a DISC message informing the disconnection of the CC sublayer of the L3 layer, i.e. the call control sublayer 15, which is new to the system specifications that the reason for the disconnection is defined as a battery change. This message type includes a reason field that does not yet have all possible values. A new value is now applied to the autumn field, which means replacing the battery. The network MN responds with an acknowledgment message 42, which is a discharge message with the value of the cause-20 field as well as the value indicating the battery replacement. The connections between the mobile station MS and the network MN are now disconnected according to the normal signaling procedure in all signaling layers. Once the user has performed the battery replacement as indicated by block 43, the subsequent signaling to reconnect between the network and the mobile station may then be initiated, for example, by a normal • 25 location update. When the mobile station MS is switched on again, it can automatically send a channel request message 44, which starts the location update. After the network MN has sent the location update termination message 45, the mobile station has re-registered with the network via its IMSI. The network MN, where other connection resources are reserved waiting, starts re-establishing connections between the network and the mobile station by saying 46, where | again, the value of the heart rate field is the value indicating the battery replacement. The connection between the network and the mobile station is then re-established by conventional signaling, which ends with a message 47 by which the mobile station indicates that a connection has been established and which is acknowledged by the network MN by a message 48.

In the above option, the reconnection between the network and the mobile station is performed from the network. In the network, the mobile station ID IMSI is known in the mobile switching center of the traffic area in question, to which is added 35 8 100936 information that the mobile station in question is being replaced by a battery. When the mobile switching center receives the IMSI of the mobile telephone in connection with the location update after the battery change, it starts to establish a connection from the waiting connection on the network to the mobile station. In order to establish the connection again in the network relatively simply, the mobile station must remain in the same mobile network and in the same traffic area, i.e. in the area of the same mobile switching center, during the battery change. In any case, the implementation must take into account the possibility that the connection from the network to the mobile phone will not be re-established, and therefore a reasonable time limit must be set for maintaining the connection in the network. If the mobile station has had time to move to another traffic area during the battery change, or if the connection from the network to the mobile station is not possible for any other reason, the connection to the network will also be disconnected after the deadline. Thus, the implementation requires the network, first, to associate battery exchange information with a particular IMSI. At the same time, the network must ensure that the connection terminating at the mobile station in question is only disconnected between the network and the mobile station and that other connection resources in the network are kept reserved for this connection. The network must still associate a connection resource reservation with that particular IMSI, and when information about re-registering that IMSI becomes available, reconnect to that mobile station, reconnect it to the connection resources considered reserved on the network, and then return to that mobile station (IMSI) and connection. normal operation. This implementation thus requires some definition and implementation of new activities online.

The method according to the invention can also be implemented in such a way that the connection between the network and the mobile station is re-established by the mobile station. In this case, it follows from the user's action initiating the battery replacement operation, e.g. selection from a menu, that the mobile station stores the status data of active connections and other necessary information, e.g. information about a pairing of 30 pairs, in the non-volatile memory. The mobile station then sends a battery replacement message to the network. The message could be, for example, the IMSI DETACH of the MM layer with new additional information to be defined for this purpose, or a new L3 message. This message is needed primarily because the network then allows the user more time 35 to replace the battery in the event of a radio disconnection than is available in the system under normal time control associated with the disconnection. The network may not be required to perform other battery replacement activities, but it may also, for example, provide information to the other party about the cause of the outage on the basis of a battery replacement message. The battery replacement message shall also be defined in such a way that if the network does not support the battery replacement function and does not understand the message, it shall respond to the message with a status message indicating that there is no support for battery replacement. When the power is turned on after the battery replacement, the mobile station recognizes that it is a battery replacement during a call or data connection and requests that the connection be re-established. In this way, the radio connection that was lost due to battery replacement is re-established. With the exception of the radio connection, all other resources have remained reserved for this connection at all times, so re-establishing the radio connection is sufficient to re-establish the connection.

10

Embodiments of the invention have been described above, to which the invention is by no means limited in any way but may vary to the extent permitted by the appended claims.

Claims (11)

10 100936
1. For the purpose of upgrading and communication between a mobile phone and a mobile phone, the communication between the mobile phone and the mobile phone (21) is interconnected by radio communication between the mobile phone and the mobile phone. Medan batterict byts i mobiltele- 25 fonen, kännetecknat av att det omfattar steg i vilka: - a mobile phone (MS) signalerar account nätet (MN) ett första meddelande (23) som aviserar kommande batteribyte, - som Respons päd första meddelandet (23) up to a maximum of 22 (i), 30. a (21) mobile phone and battery (27) is used, att äteruppkoppla förbindelse (21) mellan mobil telefonen och nätet. 35
A method for maintaining a traffic connection to or from a mobile station in a communication network, which can be divided into a radio connection 5 (21) between the mobile station and the network and a connection (22) in the network during battery replacement, comprising the steps of: - mobile station (MS) ) signals to the network (MN) a first message (23) indicating 10 upcoming battery replacement, - in response to the first message (23) the connection (22) in the network is maintained, - the connection (21) between the mobile station and the network is disconnected and a battery exchange (27) is performed , the mobile station (MS) signals to the network (MN) a second message (28) indicating that the battery exchange has been completed and starts signaling to re-establish the connection (21) between the mobile station and the network.
2. A patent according to claim 1, which can be used on a mobile phone and a clear genome is not copied with a normal signaling procedure. 12 100936
A method according to claim 1, characterized in that the connection between the mobile station and the network is disconnected by disconnecting it using a normal signaling procedure.
3. A patent according to claim 1, which comprises a mobile phone and a radioactive source according to a mobile phone and a mobile phone. 5 4. The first of the present invention claims, including the position and means (44) of said positioning device for the mobile telephone.
A method according to claim 1, characterized in that the connection between the mobile station and the network is disconnected by disconnecting the radio connection between the mobile station and the network. 25
Method according to one of the preceding claims, characterized in that the second message is a message (44) initiating the location update procedure of the mobile station.
5. A method according to claim 3, further comprising the method of claim 10 and the method (34) of replacing the radio source.
A method according to claim 3, characterized in that the second message is a message (34) requesting the re-establishment of the radio connection.
6. The present invention provides for the use of patented data, including data on the use of data processing on mobile phones and on the basis of data. 15
Method according to one of the preceding claims, characterized in that the data 35 required to re-establish the connection between the mobile station and the network are stored in the network.
7. The first of these claims is set forth in claims 1-5, which comprise data on the use of data transmission on a mobile phone and a mobile phone. 20 8. The application of a patent for the use of a patent, including the use of a signaling device and a signaling device, or of a single signaling device.
Method according to one of Claims 1 to 5, characterized in that the data required for re-establishing the connection between the mobile station and the network are stored in the mobile station. 100936 n
Method according to one of the preceding claims, characterized in that the first message is a signaling message containing a heart rate field, in which the value of the heart rate field indicates a battery change.
9. An application for a patented mobile phone, comprising a mobile phone (MS) with a mobile phone in the GSM system.
Method according to one of the preceding claims, characterized in that the mobile station (MS) is a mobile station of the GSM system.
Method according to claim 9, characterized in that the first message is an L3 layer signaling message (41).
Method according to claim 9, characterized in that the first message is an IMSI_DETACH message with additional information indicating the battery replacement and the second message is an IMSI_ATTACH message. 20
10. A method according to claim 9, further comprising a signaling device and a signaling device (41) on an L3 planet. 30
11. A patent according to claim 9, which relates to the use of an IMSI DETACH device and to an additional battery life and to an IMSI ATTACH access device.
FI954713A 1995-10-04 1995-10-04 Device for method of connection in mobile communication systems during battery replacement of mobile telephones FI100936B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FI954713 1995-10-04
FI954713A FI100936B (en) 1995-10-04 1995-10-04 Device for method of connection in mobile communication systems during battery replacement of mobile telephones

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI954713A FI100936B (en) 1995-10-04 1995-10-04 Device for method of connection in mobile communication systems during battery replacement of mobile telephones
PCT/FI1996/000504 WO1997013385A1 (en) 1995-10-04 1996-09-25 A method for maintaining a connection in a mobile communication system during a battery change in a mobile communication device
AU69905/96A AU6990596A (en) 1995-10-04 1996-09-25 A method for maintaining a connection in a mobile communication system during a battery change in a mobile communication device

Publications (3)

Publication Number Publication Date
FI954713A0 FI954713A0 (en) 1995-10-04
FI954713A FI954713A (en) 1997-04-05
FI100936B true FI100936B (en) 1998-03-13

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FI954713A FI100936B (en) 1995-10-04 1995-10-04 Device for method of connection in mobile communication systems during battery replacement of mobile telephones

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FI (1) FI100936B (en)
WO (1) WO1997013385A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5011424B2 (en) 2009-08-06 2012-08-29 アイシン・エィ・ダブリュ株式会社 In-vehicle terminal device and wireless connection program for in-vehicle terminal device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5036532A (en) * 1989-08-03 1991-07-30 Motorola, Inc. Portable telephone with power source/mode change during calls
JP2503284B2 (en) * 1989-12-28 1996-06-05 松下電器産業株式会社 Line holding device
DE4001412A1 (en) * 1990-01-19 1991-07-25 Bosch Gmbh Robert Cordless telephone with circuit signalling battery replacement - has base station prevents transmission of noise to subscriber loop until mobile appts. is reactivated
FI923979A0 (en) * 1992-09-04 1992-09-04 Nokia Mobile Phones Ltd En med battery fungerande mobiltelefon.

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FI954713A0 (en) 1995-10-04
AU6990596A (en) 1997-04-28
FI100936B1 (en)
FI954713D0 (en)
FI954713A (en) 1997-04-05

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