CN100461779C - Dual port wireless modem for circuit switched and packet switched data transfer - Google Patents
Dual port wireless modem for circuit switched and packet switched data transfer Download PDFInfo
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- CN100461779C CN100461779C CNB2005100053546A CN200510005354A CN100461779C CN 100461779 C CN100461779 C CN 100461779C CN B2005100053546 A CNB2005100053546 A CN B2005100053546A CN 200510005354 A CN200510005354 A CN 200510005354A CN 100461779 C CN100461779 C CN 100461779C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
- H04W28/14—Flow control between communication endpoints using intermediate storage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
Abstract
A dual port external wireless modem is disclosed. According to one embodiment, the external wireless modem receives command and control information over a primary serial port, and real-time data over a secondary serial port. The primary serial port is further configured to receive packet switched data, such as short message service messages, while the secondary serial port is configured to receive circuit switched data. An RF transceiver in the wireless modem modulates data and control received over the respective serial ports, preferably using a GSM protocol stack. According to an embodiment, the circuit switched and packet switched data received at the wireless modem can be simultaneously transmitted by the RF transceiver without interrupting the circuit switched data transfer, thereby avoiding a context switch and a loss of throughput.
Description
The application be that September 20, application number in 2000 are 00813084.1 the applying date, denomination of invention divides an application for the application of " being used for the dual port wireless modem that circuit conversion and packet-switched data are transmitted ".
Technical field
Present invention relates in general to radio modem, particularly relate to the dual port wireless modem of a kind of treatment circuit conversion and packet-switched data.
Background technology
In existing external wireless modulator-demodulator, radio modem is configured to connect single external device (ED), particularly connects single external device (ED) through single serial port.When hope uses radio modem to communicate, data and control signal receive through single serial port, and modulate through radio modem, so that utilize wireless protocols that data and control signal are transmitted by air interface such as GSM.
For example, Fig. 1 shows known external wireless modulator-demodulator 100.Radio modem 100 comprises: a microprocessor 104; A read-only memory (" ROM ") 112; A random access memory (" RAM ") 108 is used to keep the run-time variable of microprocessor 104; With a RF transceiver 116, be used to modulate and receive and arrive and from the data and the control signal of air interface 128.Because radio modem 100 is external components, therefore a single serial port 120 is set, it is linked to radio modem 100 on the external equipment communicatedly through the physical communication circuit such as a serial cable usually.
A shortcoming of known external wireless modulator-demodulator is all will pass through identical serial port 120 with all communications of terminal equipment.For example, perhaps, specific terminal equipment is thirsted for by the Circuit-Switched Data of a specific remote equipment (below be called " CSD ") is called out and carried out real-time data communication, if for a certain reason, this remote equipment need send to remote equipment with non-real-time data suddenly, then terminal equipment must replace non-real-time data and real time data in some way, is sent to radio modem 100 then.
Though non-real-time data and real time data alternately can on terminal equipment, not cause tangible problem, problem can appear on the radio modem 100.Its reason is, when the more effective multicomponent data transmission of common process, such as Short Message Service (below be called " SMS ") message, rather than CSD transmits, when sending non-real-time data, in fact radio modem must carry out the linguistic context conversion between non-real-time data and the real time data.
For the microprocessor with finite computational abilities and resource, when a judgement of changing between transfer mode will cause the interruption of real time data stream, the influence that the linguistic context of memory resource is changed may be very tangible.
For example, Fig. 2 shows a known treatment of conversion between transfer mode in the radio modem (linguistic context).In step 204, the single serial port 120 of initialization.In step 208, for example, by sending or cause the terminal equipment of one " ATDTxxxxxxx " order that will receive at radio modem 100, CSD of initialization calls out.Order in the step 208 will make radio modem 100 dial the number (" xxxxxxx "), and connect remote equipment through RF transceiver 116.Remote equipment is with " CONNECTxxxx " signal of loopback, and in step 212, radio modem 100 receives this signal, calls out thereby set up a CSD.
In step 216, beginning is through the data passes of radio modem 100-data are delivered to remote equipment from terminal equipment.In step 220, will carry out periodic polls to determine whether radio modem 100 receives a SMS order of terminal equipment.If received the SMS order, then the CSD of cracked ends serial port 120 transmits in step 232, and in step 236 initialization SMS data passes.In step 240, the SMS data passes takes place through the RF transceiver.
In step 244, carry out a check to determine whether the SMS data passes is finished.If this transmission is not finished, then should handle and continue step 240.Otherwise, in step 248, receive an order through serial line interface 100, for example " ATO " makes wave point 100 turn back to the linguistic context conversion of CSD pattern.Then, this is handled and continues step 216, restarts CSD and transmits.
After step 220,, whether finish to determine that CSD calls out if neither one SMS message is then carried out a check in step 224.Usually, when the CSD calling has finished, receive one " ATH " order through serial port 120.Do not finish if CSD calls out, then handle and continue step 216.Otherwise, continue treatment step 228, in this step, finish CSD and call out and abort process.
Use above-mentioned radio modem and processing to have some shortcomings at real-time oversight or in controling environment.For example, radio modem can be set in school's bus and can present real time video image through serial port 120.An alert if can appear in this school's bus.When alert if occurs, when serial port 120 is fed, interrupt this real time data stream in alert if, thereby important real time information is lost.
In addition, perhaps people also wish, for example via carrying out the SMS message that CSD calls out, receive non-real-time data by radio modem 100.Under the present configuration condition of radio modem, before calling out by termination, CSD can not carry out the reception of SMS data.
In the real time data transmission was critical environment, perhaps in not wishing very much to interrupt the environment that CSD transmits, present radio modem 100 had some significant disadvantages.Mainly be, the channel between radio modem 100 and the terminal equipment has two inconsistent patterns (CSD or SMS), and they may consume the processing resource of radio modem and interrupt critical real time communication.
Summary of the invention
The invention discloses a kind of dual-port external wireless modulator-demodulator.According to an embodiment, radio modem comprises: microprocessor; A read-only memory that connects this microprocessor; A random access memory that connects this microprocessor, this random access memory comprises a buffer; The RF transceiver of a connection microprocessor, this RF transceiver are configured to operate to send and to receive wireless signal with microprocessor; And the two-port serial port of a connection microprocessor, this two-port serial port has one first serial port and one second serial port, this first serial port is configured to receive and is used for the data that Circuit-Switched Data transmits, and this second serial port is configured to receive the data that are used for the packet-switched data transmission.
According to one embodiment of present invention, read-only memory comprises a wireless protocols storehouse, a command analyzer and a data router; Wherein the command analyzer inspection is through the order and the control signal of the reception of first serial port, data router will be sent to through the data that first serial port receives and be used for the transmission buffer that transmits through the RF transceiver, to receive data through second serial port and be sent to the RF transceiver, and the data that the RF transceiver is received are sent to first serial port.
The invention also discloses the method for operation dual-port external wireless modulator-demodulator and a computer readable medium of maintenance foregoing.
Description of drawings
Fig. 1 shows a kind of known radio modem.
Fig. 2 is the flow chart of the known treatment method of radio modem.
Fig. 3 shows an embodiment of dual port wireless modem.
Fig. 4 is the block diagram of dual port wireless modem.
Fig. 5 shows a wireless protocols storehouse, comprises the functional unit of dual port wireless modem.
Fig. 6 is the flow chart that shows a processing method of dual port wireless modem.
Embodiment
Fig. 3 shows a block diagram of dual-port external wireless modulator-demodulator 300.According to this embodiment, radio modem 300 comprises: a microprocessor 304; A RAM308 who is used for the storage running time data; A ROM312 is used to store persistant data, such as, can carry out object code; With a RF transceiver 316, it preferably is configured to transmit and receive data with circuit conversion and packet switched pattern.RAM308, ROM312 are connected microprocessor 304 communicatedly with RF transceiver 316.
In case radio modem 300 receives data, so just through air interface 332, for example, GSM or GPRS agreement are selected the transmission route to RF transceiver 316.Below, in conjunction with Fig. 4 the further details of data analysis and Route Selection being described, Fig. 4 is the block diagram of dual-port external wireless modulator-demodulator 300.
Two-port serial driver 404 handles the input transfer of autonomous serial port 324 and time serial port 328.When receiving data, these data are at first checked by AT command analyzer 408.Iff being to transmit order and control signal through main serial port 324, AT command analyzer 408 only needs to check the signal of autonomous serial port 324 so.Yet, if the AT order also can also need to check time serial port 328 when second serial port 328 transmits.According to an embodiment, AT command analyzer 408 only monitors the order of the limited quantity on time serial port 328.For example, AT command analyzer 408 can monitor the order that is used for " time-out " or " interruption " signal.Yet the AT command group can be extended to and comprise a newer command " AT～S2PORT=[value] ", and wherein " 0 " forbids time serial port 328, and " 1 " starts time serial port 328.
Data transmission to suitable transmission region is finished by data router 412.Data router 412 is distinguished real time data and non-real-time data, perhaps distinguishes Circuit-Switched Data and packet-switched data--such as the packet-switched data of SMS.If the real time data of receiving so just directly is sent to RF transceiver 316 with it.Yet if receive non-real-time data, such as SMS, these data are queued in non-real-time data buffer 416 zones of RAM308 or an equivalent region of RF transceiver 316.
Fig. 5 shows a wireless protocols storehouse 500.The basic module of gsm protocol storehouse 500 is known technology normally.For example, the basic software assembly of gsm protocol storehouse 500 can have been bought from different sale merchants, for example, can communicate by letter with other from the CONDAT Datensystem Gmblt of the debisSystemhaus of Berlin, Germany, German Hannover with selling the merchant and buy.According to an embodiment, gsm protocol storehouse 500 can be implemented in the various logic device or implement in the computer readable code of being carried out by the existing part of an embedded microprocessor of radio modem.Yet shown protocol stack 500 is different from existing radio modem storehouse, and it comprises above-mentioned AT command analyzer 408 and data router 412.
Various aspects of the present invention preferably are implemented as the software code that comprises AT command interface 504.For example, AT command interface 504 comprises AT command analyzer 408, and it monitors the serial port that is used for the AT order from terminal equipment.According to a judgement of AT command interface, order or be transferred to MN interface 512, perhaps be transferred to another algorithm of microprocessor 304.Others of the present invention are embodied in physical layer 540, and it preferably controls RF transceiver 316 and management transmission buffer 416.From the input data of far end device, for example SMS message can be handled by physical layer 540, is sent to gsm protocol storehouse 500 then, is used for the further processing of AT command analyzer 408.
Suitably the remainder of wireless protocols storehouse 500 is carried out the generality explanation now.Mobile network's man-machine interface (MN) 512 (for example receives data, data from AT command interface 504), and these data are sent to suitable information service--for example, a Short Message Service (SMS) 516, call out control service (CC) 520 for one, or Additional Services (SS) 524.Registration element 508 will provide necessary information about data and GSM network for mobile management layer 528.Each data flow of layer 508,516,520 and 524 arrives and from mobile management layer (MM) 528.
528 foundation of mobile management layer, maintenance and release are connected with the GSM network.Data and control from mobile management layer 528 are transmitted to radio resource (RR) 532.Radio resource 532 is set up and being connected an of base station of GSM network through the wave point (for example, the RF transceiver 120) that is used to call out relevant signaling and Traffic Channel.
What connect radio resource 532 is physical (L1) 540.Physical layer 540 is handled the signaling and the Traffic Channel of directly being correlated with from the calling of radio resource layer 532, and handles the data that send from data link (L2) 536.
Fig. 6 shows the computer readable medium that is used for that is stored among the ROM312, and such as the particular flow sheet that can carry out object code, this flow process is carried out by the combination of radio modem 300 or microprocessor 304, two-port serial port 320 and RF transceiver 316.Usually, before carrying out, computer readable medium is moved to the execute store zone from ROM312, for example, the reserve part of ROM308.
In step 604, the main serial port 324 of initialization two-port serial port 320 and time serial port 328.Usually, comprise command string is sent to serial port 320, with the operating parameter of specified modulation demodulator operation.For example, appointment is used for the baud of each serial port, the number and the parity check option of data bit.Certainly, these numerical value can be according to the data throughputs of the type of the terminal equipment that appends to radio modem 300 and RF transceiver 316 and are changed.
In step 608, on main serial port 324, receive an indication and will carry out the control signal that CSD calls out.In step 612, " ATDTxxxxxxx " order utilizes RF transceiver 316 that radio modem is linked on the far end device.Radio modem will receive " CONNECT baud " signal from far end device usually, be established to indicate a circuit.Should " CONNECT baud " can be repeated, turn back to terminal equipment through first or second serial line interface.
In step 616, Circuit-Switched Data passes out between present radio modem and the far end device.According to an aspect of the present invention, radio modem 300 is through the Circuit-Switched Data of time serial port 328 receptions from terminal equipment.In step 620, RF transceiver 316 preferably utilizes gsm protocol to be modulated at real time data or the Circuit-Switched Data that receives on the two-port serial port 320.
When Circuit-Switched Data was ongoing, master's one serial port 324 of radio modem 300 carried out poll clearly, perhaps waits for the interrupt signal from terminal equipment.In step 624, shown is, for Short Message Service (or " SMS ") information order is checked main serial port 324.If receive a SMS order, handle so and proceed to step 628, otherwise, handle proceeding to step 640.
In step 628, analyze the SMS order, this order and SMS message data are separated.As selection, subsequent message can comprise the SMS data.In step 632, be stored in the transmission buffer from the data of SMS message, be used for the transmission of RF transceiver 316 subsequently.When RF transceiver 316 can be worked, the SMS data are sent to far end device in step 636.It should be noted that transmission can be directly, perhaps can have of short duration delay.According to an embodiment, RF transceiver 316 sends the SMS data simultaneously, still, compares with real time data or CSD, and it is to send through a frequency of separating (or channel).
In step 640, carry out a check, whether finish with the data passes that is identified for SMS or CSD transmission.For example, if data passes is finished, and " ATH " or " AT～S2PORTO " order detected by AT command analyzer 408, and radio modem makes one to interrupt or pause command is sent by RF transceiver 316 so.Otherwise, shown in connector 644, handle to proceed to step 616, in this step, call out at step 624 continuous unbroken CSD to 636 term of execution and to be continued.
Advantage of the present invention is, when the external wireless modem receives packet-switched data Perhaps during the SMS data when (from terminal device or external device (ED)), Circuit-Switched Data The real-time transmission of calling or data can not interrupted yet. The second, the dual serial port, rather than A serial port can be effectively transmits and receive data and orders through the RF transceiver. Have so following benefit, allow the hard real time data and the low strap that monitor through a serial port Wide warning trigger event communicates through second serial port simultaneously, perhaps by the second serial end Mouth receives. Another advantage is more than one external device (ED) can be linked to wireless-modulated Demodulator. At last, although with respect to the outgoing traffic from the terminal device to the far end device, Described above-mentioned explanation of the present invention, still, opposite situation is namely from the far end device to the end The data service of end equipment (perhaps just in time being the external wireless modem) also can according to In fact similar mode takes place. When looking back specific description and accompanying drawing, will be appreciated that this A little and other advantage.
Claims (24)
1. radio modem comprises:
Microprocessor;
Read-only memory, described read-only memory communication ground connects described microprocessor, with storage code;
Random access memory, described random access memory communication ground connects described microprocessor, with the data of storage running time;
Radio-frequency (RF) transceiver, described radio-frequency (RF) transceiver communication ground connects described microprocessor, operates to send wireless signal; And
Communication ground connects the dual-port of described microprocessor, described dual-port has to first port of terminal equipment with to second port of described terminal equipment, described first port is used to receive the data that real time data is transmitted that are used for from described terminal equipment, and described second port is used for receiving simultaneously the data that non-real-time data transmits that are used for from described terminal equipment; And
Transmission buffer, described transmission buffer communication ground connects described microprocessor and described second port, so that storage described is used for the data that non-real-time data transmits by described second port from what described terminal equipment received before the described data that are used for the non-real-time data transmission of transmission.
2. radio modem according to claim 1, wherein, the described real time data data packets transmitted that is used for is drawn together the data that are used for the Circuit-Switched Data transmission, the wherein said non-real-time data data packets transmitted that is used for is drawn together the data that are used for the packet-switched data transmission, and, wherein said radio-frequency (RF) transceiver be used to transmit the described data that are used for the Circuit-Switched Data transmission and described be used for data that packet-switched data transmits the two.
3. radio modem according to claim 1 and 2, further comprise data router, described data router is used for the described data that are used for the non-real-time data transmission are routed to described transmission buffer, and the described data that are used for the real time data transmission are routed to are different from described transmission buffer part.
4. radio modem according to claim 3, wherein, described data router is routed to described radio-frequency (RF) transceiver with the described data that are used for the real time data transmission.
5. radio modem according to claim 4, wherein, described data router is the part of wireless protocols storehouse.
6. radio modem according to claim 1 and 2, wherein, described random access memory comprises described transmission buffer.
7. radio modem according to claim 1 and 2, wherein, described transmission buffer is included in the described radio-frequency (RF) transceiver.
8. radio modem according to claim 1 and 2, wherein, described first and second ports comprise serial port.
9. radio modem according to claim 1 and 2, wherein, described radio modem comprises the external wireless modulator-demodulator that is positioned at described terminal equipment outside.
10. radio modem according to claim 1 and 2, wherein, described dual-port comprises the RS-232 communication chip.
11. radio modem according to claim 1 and 2 further comprises the wireless protocols storehouse that is selected from gsm protocol storehouse and GPRS protocol stack, and wherein said non-real-time data transmission comprises the Short Message Service data passes.
12. a method that wirelessly sends data comprises:
From the device receiving real-time data that is connected with radio modem communication ground;
Utilize described radio modem to transmit described real time data;
When the real time data transmission taking place and receive described real time data simultaneously, be used for the data that non-real-time data transmits from the described device reception that is connected with radio modem communication ground at described radio modem place;
The described data that are used for the non-real-time data transmission of storage are used for subsequent transmission in transmission buffer; And
After postponing, utilize described radio modem to transmit the described data that non-real-time data transmits that are used for.
13. method according to claim 12, wherein, the described real time data data packets transmitted that is used for is drawn together the data that are used for the Circuit-Switched Data transmission, and the wherein said non-real-time data data packets transmitted that is used for is drawn together the data that are used for the packet-switched data transmission.
14. method according to claim 12, wherein, further comprise the described data that are used for the non-real-time data transmission are routed to described transmission buffer, and under not by the situation of described transmission buffer, described real time data is routed to radio-frequency (RF) transceiver.
15. according to each described method in the claim 12 to 14, wherein, the described data that described transmission is used for the non-real-time data transmission are to finish not interrupting transmitting under the situation of described real time data.
16. according to each described method in the claim 12 to 14, wherein, described transmission real time data comprises uses the agreement that is selected from GSM and GPRS, and, wherein transmit the described non-real-time data data packets transmitted that is used for and draw together execution Short Message Service data passes.
17. a device that is used to send radiofrequency signal comprises:
Radio-frequency (RF) transceiver is used for sending and receiving wireless signal;
Be coupled to the two-port serial port of described radio-frequency (RF) transceiver, described two-port serial port has to the main serial port of terminal equipment with to the inferior serial port of described terminal equipment, described serial port is used to receive the data that Circuit-Switched Data transmits that are used for from described terminal equipment, and described main serial port is used for receiving simultaneously the data that packet-switched data is transmitted that are used for from described terminal equipment;
Transmit buffer is coupled to described two-port serial port; And
Data router, described data router are used for and will arrive described transmission buffer by the data pilot that main serial port receives, and will arrive described radio-frequency (RF) transceiver by the data pilot that described serial port receives.
18. device according to claim 17 also comprises the read-only memory that is coupled to described radio-frequency (RF) transceiver, described read-only memory comprises wireless protocols storehouse and command analyzer.
19. device according to claim 18, wherein, described command analyzer is used to check order and the control signal that receives by described main serial port.
20. device according to claim 19, wherein, described command analyzer is used for monitoring described serial port at described order and control signal, wherein, described data router is used for the execute store that described order and control signal from described serial port pass to random access memory is handled.
21. device according to claim 18 also comprises the random access memory that is coupled to described radio-frequency (RF) transceiver.
22. according to each described device in the claim 17 to 21, wherein, described two-port serial port is used for receiving simultaneously by the Circuit-Switched Data of described serial port and order and control signal by described main serial port.
23. according to each described device in the claim 17 to 21, wherein, described two-port serial port is used to utilize described radio-frequency (RF) transceiver to keep described Circuit-Switched Data transmission and also utilizes described radio-frequency (RF) transceiver to send described packet-switched data transmission simultaneously.
24. according to each described device in the claim 17 to 21, wherein, described wireless protocols storehouse comprises the gsm protocol storehouse, wherein, described packet-switched data transmission comprises the Short Message Service data passes.
Applications Claiming Priority (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/400,623 | 1999-09-20 | ||
| US09/400,623 US6363335B1 (en) | 1999-09-20 | 1999-09-20 | Communications bridge for circuit switched data transfer simulation |
| US44402099A | 1999-11-19 | 1999-11-19 | |
| US09/444,044 | 1999-11-19 | ||
| US09/444,020 | 1999-11-19 | ||
| US09/444,044 US6697421B1 (en) | 1999-11-19 | 1999-11-19 | Operator independent, transparent wireless modem management |
| US09/524,767 | 2000-03-14 | ||
| US09/524,767 US7197330B1 (en) | 2000-03-14 | 2000-03-14 | Dual port wireless modem for circuit switched and packet switched data transfer |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00813084 Division CN1193293C (en) | 1999-09-20 | 2000-09-20 | Dual port wireless modem for circuit switched and packet switched data transfer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1677963A CN1677963A (en) | 2005-10-05 |
| CN100461779C true CN100461779C (en) | 2009-02-11 |
Family
ID=27503453
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00813084 Expired - Fee Related CN1193293C (en) | 1999-09-20 | 2000-09-20 | Dual port wireless modem for circuit switched and packet switched data transfer |
| CNB2005100053546A Expired - Fee Related CN100461779C (en) | 1999-09-20 | 2000-09-20 | Dual port wireless modem for circuit switched and packet switched data transfer |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00813084 Expired - Fee Related CN1193293C (en) | 1999-09-20 | 2000-09-20 | Dual port wireless modem for circuit switched and packet switched data transfer |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP4755375B2 (en) |
| CN (2) | CN1193293C (en) |
| AU (1) | AU4019501A (en) |
| GB (1) | GB2373413B (en) |
| WO (1) | WO2001022193A2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7197330B1 (en) | 2000-03-14 | 2007-03-27 | Intel Corporation | Dual port wireless modem for circuit switched and packet switched data transfer |
| US6697421B1 (en) | 1999-11-19 | 2004-02-24 | Intel Corporation | Operator independent, transparent wireless modem management |
| DE102006046187A1 (en) * | 2006-09-29 | 2008-04-03 | Infineon Technologies Ag | Data communication method for data processing device i.e. personal computer, involves extracting data from data packets and providing data in packets of one type with format according to data communication protocol for device |
| CN102170618A (en) * | 2010-02-26 | 2011-08-31 | 国际商业机器公司 | Short message processing method and equipment |
| CN102301756B (en) * | 2011-07-13 | 2015-04-08 | 华为终端有限公司 | Method and device used for communication |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5619508A (en) * | 1993-01-08 | 1997-04-08 | Multi-Tech Systems, Inc. | Dual port interface for a computer-based multifunction personal communication system |
| US5778024A (en) * | 1996-02-01 | 1998-07-07 | Qualcomm Incorporated | Dual-mode communications processor |
| US5809415A (en) * | 1995-12-11 | 1998-09-15 | Unwired Planet, Inc. | Method and architecture for an interactive two-way data communication network |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100302924B1 (en) * | 1996-12-20 | 2001-09-22 | 포만 제프리 엘 | Improvements in data communications |
| JPH11251998A (en) * | 1998-02-27 | 1999-09-17 | Hitachi Ltd | Communication equipment |
-
2000
- 2000-09-20 AU AU40195/01A patent/AU4019501A/en not_active Abandoned
- 2000-09-20 WO PCT/US2000/025682 patent/WO2001022193A2/en active Application Filing
- 2000-09-20 CN CN 00813084 patent/CN1193293C/en not_active Expired - Fee Related
- 2000-09-20 GB GB0204100A patent/GB2373413B/en not_active Expired - Fee Related
- 2000-09-20 JP JP2001525496A patent/JP4755375B2/en not_active Expired - Fee Related
- 2000-09-20 CN CNB2005100053546A patent/CN100461779C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5619508A (en) * | 1993-01-08 | 1997-04-08 | Multi-Tech Systems, Inc. | Dual port interface for a computer-based multifunction personal communication system |
| US5809415A (en) * | 1995-12-11 | 1998-09-15 | Unwired Planet, Inc. | Method and architecture for an interactive two-way data communication network |
| US5778024A (en) * | 1996-02-01 | 1998-07-07 | Qualcomm Incorporated | Dual-mode communications processor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1677963A (en) | 2005-10-05 |
| WO2001022193A3 (en) | 2001-08-09 |
| JP2003510865A (en) | 2003-03-18 |
| GB0204100D0 (en) | 2002-04-10 |
| GB2373413B (en) | 2004-01-07 |
| CN1193293C (en) | 2005-03-16 |
| WO2001022193A2 (en) | 2001-03-29 |
| JP4755375B2 (en) | 2011-08-24 |
| GB2373413A (en) | 2002-09-18 |
| AU4019501A (en) | 2001-04-24 |
| CN1382275A (en) | 2002-11-27 |
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