GB2296631A - Digital mobile communication system - Google Patents
Digital mobile communication system Download PDFInfo
- Publication number
- GB2296631A GB2296631A GB9526570A GB9526570A GB2296631A GB 2296631 A GB2296631 A GB 2296631A GB 9526570 A GB9526570 A GB 9526570A GB 9526570 A GB9526570 A GB 9526570A GB 2296631 A GB2296631 A GB 2296631A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cell station
- public
- connection
- mode
- private
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/105—PBS [Private Base Station] network
Abstract
A digital mobile terminal 201 is operable in two modes. When a call is to be set up, i.e. an off-hook signal is detected, the terminal first attempts to communicate in a private mode with a private base station 203. If this fails, i.e. no connection is made within a time period set by a timer, then the terminal switches to a public mode. The terminal attempts to communicate with a public base station 202 in a public mode until another time period expires. In this way, cheaper rate calls are always attempted first even if a user forgets to change the position of a mode change switch from receiving calls in the public cellular system. <IMAGE>
Description
DIGITAL MOBILE COMMUNICATION SYSTEM
The present invention generally relates to a digital mobile communication system comprising public cell stations and private cell stations, and in particular to a digital mobile terminal and a method for making a connection of the digital mobile terminal to either a public or private cell station.
Recently, a digital telephone system known as a personal handy phone system (PHS) has been provided with public cell stations intended for use outdoors in addition to private cell etations intended for home use, A public cell station is connected to an ISDN public line and a private cell station to a subscriber line. A mobile telephone terminal is generally provided with a manual mode switch which manually changes the operation mode of the mobile telephone terminal between a public mode and a private mode. When carrying it outdoors, a user sets the manual mode switch to the position of public mode which allows the mobile telephone terminal to make a connection to the nearest public cell station. When at home, the user sets the manual mode switch to the position of private mode, allowing it to make a connection to the private cell station.
However, in cases where a public cell station is located in the vicinity of the user's home, the respective radio zones of the private cell station and the public cell station are possibly overlapped, allowing the mobile telephone terminal to make a connection to both the pubic and the private cell stations.
Since a charge is different between public and subscriber connect services, as of now, the subscriber connect service has a smaller charge, the user will set the manual mode switch to the position of the private mode. In this case, when the manual mode switch is carelessly set to the public mode, the public connect service will be charged by the amount of connect time to the user's account without higher knowing.
Features of a digital mobile terminal and a connection method to be described below, as an example, are that a careless connection of the digitial mobile terminal which is located within the overlapped area of radio zones provided by the private cell station installed in the user's home and the public cell station near the home is less likely to occur than with previous arrangements, and that it is possible automatically to make a connection of the digital mobile terminal to either the private cell station or the public cell station with more reliability.
A digital mobile terminal to be described below by way of example automatically switches between a public mode and a private mode with giving one a higher priority. More specifically, when in the public mode, the digital mobile terminal is forced into the private mode by off-hook and then starts a predetermined calling sequence to the private cell station. If a connection to the private cell station fails, the digital mobile terminal automatically switches into the public mode and then makes a call to the public cell station.
An aspect of one arrangement to be described below as an example is that an operation mode of the digital mobile terminal is detected which is one of a public mode and a private mode. The public mode causes the digital mobile terminal to operate for connection to the public cell station, and the private mode causes the digital mobile terminal to operate for connection to the private cell station.
When a calling request occurs due to a user operation is detected in a state that the digital mobile terminal is in the public mode, the digital mobile terminal is forced to switch to the private mode. Therefore, a first connection to the private cell station is requested according to the private mode. If the first connection to the private cell station fails, the digital mobile terminal switches from the private mode to the public mode and then requests a second connection to the public cell station according to the public mode.
The first connection to the private cell station may be requested according to the private mode when a timer is reset for a predetermined timer value. If the timer reaches the predetermined timer value without receiving a control signal from the private cell station, the digital mobile terminal is forced to switch to the public mode.
Furthermore, the second connection to the public cell station may be requested according to the public mode when the timer is reset for the predetermined timer value. And the digital mobile terminal stops calling if the timer reaches the predetermined timer value without receiving a control signal from the public cell station.
Arrangements illustrative of the present invention will now be described, by way of example, with reference to the accompanying drawings in which:
Fig. 1 is a block diagram showing the functional configuration of a digital cordless telephone terminal,
Fig. 2 is a schematic diagram showing an operation of the digital cordless telephone terminal located in the overlapped areas of the radio zones provided by the public cell station and the private cell station,
Fig. 3 is a flowchart showing a connection procedure of the digital cordless telephone terminal which is in the public mode, and
Fig. 4 is a flowchart showing a connection procedure of the digital cordless telephone terminal which is in the private mode.
Referring to Fig. 1, a cordless telephone terminal according to the present invention is mainly comprised of a RF (radio frequency) system 10, a baseband system 11 and a control system 12. The RF system 10 i9 comprised of an antenna 101, an antenna switch 102, a RF receiver 103, a RF transmitter 104 and a frequency synthesizer 105. The antenna 101 is connected to the antenna switch 102 which is in turn connected to the RF receiver 103 and the RF transmitter 104. The RF receiver 103 converts a
RF received signal into a baseband received signal and outputs it to the baseband system 11. The RF transmitter 104 converts a baseband transmitting signal received from the baseband system 11 into a RF transmitting signal and outputs it to the antenna 101 through the antenna switch 102.The frequency synthesizer 105 supplies variable reference frequencies to the RF receiver 103 and the RF transmitter 104, respectively, and changes the receiving frequency and the transmitting frequency in accordance with a frequency control signal.
The baseband system 11 is comprised of a demodulator 106, a channel encoder and decoder (CODEC) 107 including a TDMAXTDD control circuit, a modulator 108 and a speech CODEC 109. The baseband received signal is demodulated by the demodulator 106 and then is decoded by the channel CODEC 107 and the speech CODEC 109 into a received speech signal which is reproduced by the speaker 110. On the other hand, the microphone 111 generates a transmitting speech signal which is encoded by the speech CODEC 109 and the channel CODEC 107. The channel-coded transmitting signal is modulated by the modulator 108 into the baseband transmitting signal which is output to the RF transmitter 104 of the RF system 10. The channel CODEC 107 outputs the frequency control signal to the frequency synthesizer 105 and outputs a timing control signal to the RF system 10 for transmission and reception timing control.
The operations of the EF system 10 and the baseband system 11 are controlled by the control system 12. The control system 12 is comprised of a processor 112, a memory 113, a mode-switch timer 114, and a controller 115 for a display 116 and a keypad 117.
The memory 113 previously stores private setting data, public setting data, an identification number (ID), an identification number of the private cell station (private CS-ID) and an identification number of the public cell station (public
CS-ID). The private setting data is comprised of transmitting and receiving frequency data and other necessary data for a private-mode operation including a connection establishment to the private cell station. The public setting data is comprised of transmitting and receiving frequency data and other necessary data for a public-mode operation including a connection establishment to the public cell station. The processor 112 selects one of the private setting data and the public setting data according to the position of the mode setting key of the keypad 117 and a connection procedure as mentioned later.The private
CS-ID is used to check whether a received acknowledgment includes the same ID number at the time of connection to the private cell station. Similarly, the public CS-ID is used to check whether a received acknowledgment includes the same ID number at the time of connection to the public cell station.
The mode-switch timer 114 is reset and started by the processor 112 and outputs a time-out signal to the processor 112 when a predetermined maximum time interval has elapsed.
Receiving the time-out signal from the mode-switch timer 114, the processor 112 switches an operation mode of the telephone terminal front the private mode to the public mode or from the public mode to a stop mode, which will be described in detail later.
Furthermore, the processor 112 performs calling/called and connection procedures by controlling the RP system 10 and the baseband system 11.
Referring to Fig. 2, the mobile telephone terminal 201 as shown in Fig. 1 is taken with the user, the public cell station 202 is installed outdoors, and the private cell station 203 is placed in the user's house. The public cell station 202 is connected to the ISDN public line 204 and the private cell station 203 to the subscriber line 205. In Fig. 2, it is assumed that the public cell station 202 is in the vicinity of the users house and there is an overlapped area E3 of the radio zone El of a public cell station 202 and the radio zone E2 of a private cell station 203.
In such a situation, when located in the overlapped area
E3, the mobile telephone terminal 201 can make a connection to both the public cell station 202 and the private cell station 203.
According to the embodiment of the present invention, a higher priority is given to a connection to the private cell station 203 because the charge of a private connection service through the subscriber line 205 is generally smaller than that of a public connection service through the public line 204 at the present time.
More specifically, when calling, the processor 112 performs a private connection procedure according to the private setting data stored in the memory 113 even if the mode setting key of the keypad 117 is set to the public-mode position. Needless to say, the higher priority will be given to a smaller-charge service of the private and public connection services. The calling operations of the mobile telephone terminal will be described in detail hereinafter.
Referring to Fig. 3, it is assumed that the mode setting key of the keypad 117 is set to the public-mode position and the processor 112 are performing an intermittent receiving operation in the public mode (S10). When the user presses an off-hook function key for calling (S11), an operation mode of the mobile telephone terminal is forced into the private mode by the processor 112 (S12). More specifically, when the off-hook key is pressed, the processor 112 reads the private CS-ID and the private setting data from the memory 113 and sets the RF system 10 and the baseband system 11 according to those data. In other words, the operation mode of the telephone terminal switches from the public mode to the private mode and thereby the frequency of a control channel also switches to a predetermined frequency for connection to the private cell station.
After switching to the private mode, the processor 112 controls the channel CODEC 107 of the baseband system 11 to transmit a call request to the private cell station when starting the mode-switch timer 114 set for the predetermined maximum time interval (S13). At the same time, the destination number input by the dialing keys of the keypad 117 is displayed on the LCD 116.
After that, the processor 112 waits for an acknowledgment from the private cell station (514-518). More specifically, when receiving a control signal (S14), the processor 112 checks whether a source identification number included in the received control signal is identical to the private CS-ID (515). If not identical, the waiting steps (S14-S18) are repeatedly executed until the private CS-ID is received (YES of S15) or the mode-switch timer 114 exceeds the predetermined maximum time interval (YES of S1B).
When receiving the private CS-ID (YES of Si 5), the processor 112 controls the baseband system 11 so as to take well-known steps for connection establishment (S16) and a telephone communication is started through the private cell station (S17). In other words, in this embodiment, a higher priority is given to the private mode because, as of now, the private connection service has a smaller charge than the public connection service. Therefore, even if the mobile telephone terminal is performing the public-mode receiving operation with the mode setting key setting to the public-mode position, the calling steps are started with the private mode.
On the other hand, if the mode-switch timer 114 exceeds the predetermined maximum time interval (YES of S18), the operation mode of the telephone terminal switches from the private mode to the public mode (S19) and thereby the frequency of a control channel also switches to a predetermined frequency for connection to the public cell station.
After switching to the public mode, the processor 112 controls the channel CODEC 107 of the baseband system 11 to transmit a call request to the public cell station when starting the mode-switch timer 114 set for the predetermined maximum time interval (820). After that, the processor 112 waits for an acknowledgment from the public cell station (S21-S25). More specifically, when receiving a control signal (S21), the processor 112 checks whether a source identification number included in the received control signal is identical to the public CS-ID (S22).
If not identical, the waiting steps (S21-S25) are repeatedly executed until the public CS-ID is received (YES of S22) or the mode-switch timer 114 exceeds the predetermined maximum time interval (YES of S25).
When receiving the public CS-ID (YES of S22), the processor 112 controls the baseband system 11 so as to take well-known steps for connection establishment (S23) and a telephone communication is started through the public cell station (S24).
If the mode-switch timer 114 exceeds the predetermined maximum time interval (YES of 525), the processor 112 stops calling (S26) and returns to the intermittent receiving operation in the public mode.
Referring to Fig. 4, it is assumed that the mode setting key of the keypad 117 is set to the private-mode position and the processor 112 are performing an intermittent receiving operation in the private mode (S30). When the user presses an off-hook function key for calling (S31), the processor 112 controls the channel CODEC 107 of the baseband system 11 to transmit a call request to the private cell station when starting the mode-switch timer 114 set for the predetermined maximum time interval (S32).
At the same time, the destination number input by the dialing keys of the keypad 117 is displayed on the LCD 116. After that, the processor 112 waits for an acknowledgment from the private cell station (S33-537). More specifically, when receiving a control signal (S33), the processor 112 checks whether a source identification number included in the received control signal is identical to the private CS-ID (S34). If not identical, the waiting steps (S33-S34) are repeatedly executed until the private
CS-ID is received (YES of S34) or the mode-switch timer 114 exceeds the predetermined maximum time interval (YES of S37).
When receiving the private CS-ID (YES of S34), the processor 112 controls the baseband system 11 so as to take well-known steps for connection establishment (sox5) and a telephone communication is started through the private cell station (S36).
On the other hand, if the mode-switch timer 114 exceeds the predetermined maximum time interval (YES of S37), the processor 112 stops calling (S38) and returns to the intermittent receiving operation in the private mode.
Alternatively, in cases where the mode setting key of the keypad 117 is set to the private-mode position and the processor 112 are performing an intermittent receiving operation in the private mode, the processor 112 may allow the mode-switch timer 114 to stop working. In other words, the calling procedure may continue to be performed until the user stops the calling procedure by pressing an on-hook key.
While there has been described what is at present considered to be preferred embodiment of the invention, it will be understood that various modifications may be made therein. For instance, the present invention may be applied to the data transmission of facsimile machines, computers and the likes. It is intended to cover in the appended claims all such modifications as fall within the scope of the protection sought by the appended claims.
Claims (8)
1. A method for providing a connection between a digital mobile terminal and one of a public cell station and a private cell station, said public cell station being located outdoors which is connected to a public communication line, and said private cell station being located indoors which is connected to a subscriber line, said method comprising the steps of::
a) detecting an operation mode of said digital mobile terminal, said operation mode being one of a public mode and a private mode, said public mode causing said digital mobile terminal to operate for connection to said public cell station, and said private mode causing said digital mobile terminal to operate for connection to said private cell station; b) detecting a calling request in said operation mode, said calling request occurring due to a user operation;
c) switching said digital mobile terminal to said private mode when said calling request is detected in said public mode;
d) requesting a first connection to said private cell station according to said private mode;
e) switching said digital mobile terminal to said public mode when said first connection to said private cell station fails; and
f) requesting a second connection to said public cell station according to said public mode.
2. The method according to claim 1, wherein:
said step (d) comprises a step of requesting said first connection to said private cell station according to said private mode when resetting a timer for a predetermined timer value; and
said step (e) comprises the steps of:
waiting for a control signal from said private cell station; and
switching said digital mobile terminal to said public mode when said timer reaches said predetermined timer value without receiving said control signal from said private cell station.
3. The method according to claim 1, further comprising a step of:
g) stopping calling when said second connection to said public cell station fails.
4. The method according to claim 3, wherein:
said step (f) comprises a step of requesting said second connection to said public cell station according to said public mode when resetting a timer for a predetermined timer value; and
said step (g) comprises a step of:
waiting for a control signal from said public cell station; and
stopping calling when said timer reaches said predetermined timer value without receiving said control signal from said public cell station.
5. A method for providing a connection between a digital mobile terminal and one of a first cell station and a second cell station, said first cell station being connected to a first communication line, said second cell station being connected to a second communication line which has a smaller connection service charge then said first communication line, said method comprising the steps of::
a) detecting an operation mode of said digital mobile terminal, said operation mode being one of a first operation mode and a second operation mode, said first operation mode causing said digital mobile terminal to operate for connection to said first cell station, and said second operation mode causing said digital mobile terminal to operate for connection to said second cell station; b) detecting a calling request in said operation mode, said calling request occurring due to a user operation;
c) switching said digital mobile terminal to said second operation mode when said calling request is detected in said first operation mode;
d) requesting a first connection to said second cell station according to said second operation mode;;
e) switching said digital mobile terminal to said first operation mode when said first connection to said second cell station fails; and
f) requesting a second connection to said first cell station according to said first operation mode.
6. A method for providing a connection between a digital mobile terminal and one of a first cell station and a second cell station, said first cell station being connected to a first communication line, said second cell station being connected to a second communication line, said method comprising the steps of::
a) detecting an operation mode of said digital mobile terminal, said operation mode being one of a first operation mode and a second operation mode, said first operation mode causing said digital mobile terminal to operate for connection to said first cell station, said second operation mode causing said digital mobile terminal to operate for connection to said second cell station, and said first operation mode having a higher priority than said second operation mode; b) detecting a calling request in said operation mode, said calling request occurring due to a user operation;
c) switching said digital mobile terminal to said first operation mode when said calling request is detected in a state that said digital mobile terminal is in said second operation mode;;
d) requesting a first connection to said first cell station according to said first operation mode so as to establish said first connection between said digital mobile terminal and said first cell station;
e) switching said digital mobile terminal to said second operation mode when said first connection to said first cell station fails; and
f) requesting a second connection to said second cell station according to said second operation mode so as to establish said second connection between said digital mobile terminal and said second cell station.
7. A method for providing a connection between a digital mobile terminal and one of a public cell station and a private cell station, substantially as described herein with
reference to any one of the accompanying drawings.
8. An apparatus for providing a connection between a digital mobile terminal and one of a public cell station and
a private cell station, substantially as described herein with
reference to any one of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33747694A JPH08186876A (en) | 1994-12-28 | 1994-12-28 | Digital cordless telephone set and connection system therefor |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9526570D0 GB9526570D0 (en) | 1996-02-28 |
| GB2296631A true GB2296631A (en) | 1996-07-03 |
| GB2296631B GB2296631B (en) | 1996-11-27 |
Family
ID=18309010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9526570A Expired - Fee Related GB2296631B (en) | 1994-12-28 | 1995-12-28 | Digital mobile comunication system |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH08186876A (en) |
| CN (1) | CN1071981C (en) |
| GB (1) | GB2296631B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2297461B (en) * | 1995-01-25 | 1998-06-24 | Matsushita Electric Ind Co Ltd | Wireless telephone apparatus |
| WO2000010349A1 (en) * | 1998-08-17 | 2000-02-24 | Telefonaktiebolaget Lm Ericsson (Publ) | System and method of implementing a private charge rate in a radio telecommunications network |
| GB2358995A (en) * | 1999-09-22 | 2001-08-08 | Simoco Int Ltd | Mobile radio unit with means to switch automatically between communications networks after a predetermined number of call requests are refused, fail or finish |
| GB2365261A (en) * | 2000-07-18 | 2002-02-13 | Nokia Mobile Phones Ltd | Network selection in a mobile telecommunications system |
| DE10205720A1 (en) * | 2002-02-12 | 2003-08-21 | Condat Ag | Wireless digital communication method using protocol stacks for mobile radio standard, by providing mobile switching center with base station controllers that communicate with multiple networks |
| GB2409610A (en) * | 2003-12-23 | 2005-06-29 | Nec Technologies | Network acquisition in accordance with one of a plurality of radio access technologies |
| EP1684537A1 (en) | 2005-01-24 | 2006-07-26 | Research In Motion Limited | Cell-phone operation giving increased full service in manual/select mode |
| US7317913B2 (en) | 2005-01-24 | 2008-01-08 | Research In Motion Limited | Cell-phone operation giving increased full service in manual/select mode |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100627105B1 (en) * | 1997-12-30 | 2007-01-19 | 엘지전자 주식회사 | Method for Combining Cordless Phone and Portable Phone using Repeater Loaded into Car |
| DE69921344T2 (en) | 1999-07-16 | 2006-02-09 | Mitsubishi Denki K.K. | END DEVICE FOR MOBILE COMMUNICATION |
| KR20030068726A (en) * | 2002-02-16 | 2003-08-25 | 엘지전자 주식회사 | Radio access network selection/reselection method in multi-mode terminal |
| KR100513022B1 (en) * | 2002-09-10 | 2005-09-05 | 삼성전자주식회사 | Method of using common data location register of public network and private network private in wireless highspeed data system |
| CN100466777C (en) * | 2005-01-14 | 2009-03-04 | 英华达（南京）科技有限公司 | Method of switching communication module in communication devices |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2225512A (en) * | 1988-09-23 | 1990-05-30 | Motorola Inc | Cellular cordless telephone |
| GB2257337A (en) * | 1991-01-15 | 1993-01-06 | Ericsson Ge Mobile Communicat | Conserving power in hand held mobile telephones during a receiving mode of operation |
| EP0563898A2 (en) * | 1992-03-31 | 1993-10-06 | Casio Computer Co., Ltd. | Portable radio telephone and method for selecting radio channel of cheap fee |
| GB2269723A (en) * | 1992-07-17 | 1994-02-16 | Sagem | Mobile radiotelephony combining cellular and local cordless systems |
| GB2284964A (en) * | 1993-12-17 | 1995-06-21 | Nec Corp | Radiotelephone operable on a plurality of radio systems |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9013605D0 (en) * | 1990-06-18 | 1990-08-08 | Stc Plc | Mobile communications |
| JP3252524B2 (en) * | 1992-03-31 | 2002-02-04 | カシオ計算機株式会社 | Mobile phone and wireless channel setting method |
| RU2107992C1 (en) * | 1992-09-23 | 1998-03-27 | Сименс АГ | Handover method for mobile subscribers of mobile radio network |
| JPH06276144A (en) * | 1993-03-17 | 1994-09-30 | Mitsubishi Electric Corp | Digital cordless telephone system |
-
1994
- 1994-12-28 JP JP33747694A patent/JPH08186876A/en active Pending
-
1995
- 1995-12-28 CN CN95113186A patent/CN1071981C/en not_active Expired - Fee Related
- 1995-12-28 GB GB9526570A patent/GB2296631B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2225512A (en) * | 1988-09-23 | 1990-05-30 | Motorola Inc | Cellular cordless telephone |
| GB2257337A (en) * | 1991-01-15 | 1993-01-06 | Ericsson Ge Mobile Communicat | Conserving power in hand held mobile telephones during a receiving mode of operation |
| EP0563898A2 (en) * | 1992-03-31 | 1993-10-06 | Casio Computer Co., Ltd. | Portable radio telephone and method for selecting radio channel of cheap fee |
| GB2269723A (en) * | 1992-07-17 | 1994-02-16 | Sagem | Mobile radiotelephony combining cellular and local cordless systems |
| GB2284964A (en) * | 1993-12-17 | 1995-06-21 | Nec Corp | Radiotelephone operable on a plurality of radio systems |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2297461B (en) * | 1995-01-25 | 1998-06-24 | Matsushita Electric Ind Co Ltd | Wireless telephone apparatus |
| WO2000010349A1 (en) * | 1998-08-17 | 2000-02-24 | Telefonaktiebolaget Lm Ericsson (Publ) | System and method of implementing a private charge rate in a radio telecommunications network |
| US6097937A (en) * | 1998-08-17 | 2000-08-01 | Telefonaktiebolaget Lm Ericsson (Publ) | System and method of implementing a private charge rate in a radio telecommunications network |
| GB2358995A (en) * | 1999-09-22 | 2001-08-08 | Simoco Int Ltd | Mobile radio unit with means to switch automatically between communications networks after a predetermined number of call requests are refused, fail or finish |
| GB2365261A (en) * | 2000-07-18 | 2002-02-13 | Nokia Mobile Phones Ltd | Network selection in a mobile telecommunications system |
| EP1175119A3 (en) * | 2000-07-18 | 2002-06-05 | Nokia Corporation | Network selection in a mobile telecommunications system |
| DE10205720A1 (en) * | 2002-02-12 | 2003-08-21 | Condat Ag | Wireless digital communication method using protocol stacks for mobile radio standard, by providing mobile switching center with base station controllers that communicate with multiple networks |
| GB2409610A (en) * | 2003-12-23 | 2005-06-29 | Nec Technologies | Network acquisition in accordance with one of a plurality of radio access technologies |
| GB2409610B (en) * | 2003-12-23 | 2005-11-23 | Nec Technologies | Cellular network acquisition method and apparatus |
| EP1684537A1 (en) | 2005-01-24 | 2006-07-26 | Research In Motion Limited | Cell-phone operation giving increased full service in manual/select mode |
| US7317913B2 (en) | 2005-01-24 | 2008-01-08 | Research In Motion Limited | Cell-phone operation giving increased full service in manual/select mode |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2296631B (en) | 1996-11-27 |
| CN1071981C (en) | 2001-09-26 |
| GB9526570D0 (en) | 1996-02-28 |
| JPH08186876A (en) | 1996-07-16 |
| CN1135153A (en) | 1996-11-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20031228 |