CA1317348C - Location based adaptive radio control - Google Patents
Location based adaptive radio controlInfo
- Publication number
- CA1317348C CA1317348C CA000610392A CA610392A CA1317348C CA 1317348 C CA1317348 C CA 1317348C CA 000610392 A CA000610392 A CA 000610392A CA 610392 A CA610392 A CA 610392A CA 1317348 C CA1317348 C CA 1317348C
- Authority
- CA
- Canada
- Prior art keywords
- radio
- location
- adjusting
- channel
- determining
- 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.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
- H04W52/283—Power depending on the position of the mobile
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
- H04M1/6041—Portable telephones adapted for handsfree use
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
LOCATION-BASED ADAPTIVE RADIO CONTROL
Abstract of the Disclosure A method (200) and apparatus (100) is provided for a radio having adjustable operating parameters to adjust at least one such adjustable operating parameter based on the current location of the radio. Operating parameters which may be so adjusted include, but are not limited to, the following: transmitting power, operating channel, operating band, modulation type, modulation index, frequency deviation, squelch setting, channel spacing, control channel (for trunked communications), noise blanker characteristic, and receive bandwidth.
Abstract of the Disclosure A method (200) and apparatus (100) is provided for a radio having adjustable operating parameters to adjust at least one such adjustable operating parameter based on the current location of the radio. Operating parameters which may be so adjusted include, but are not limited to, the following: transmitting power, operating channel, operating band, modulation type, modulation index, frequency deviation, squelch setting, channel spacing, control channel (for trunked communications), noise blanker characteristic, and receive bandwidth.
Description
~ 3 ~
LOCATION-BASED ADAPTIVE RADIO CONTROL
Backqround of the Invention This invention pertains to radios.
Two-way radios have a number of operating parameters including, but not limited to, transmitting power, operating frequencies (channel), operating band, modulation type, modulation index, frequency deviation, squelch setting, channel spacing, control channel (for trunked communications), noise blanker characteristic, and receive bandwidth. Of these parameters, some are fixed, while others may be, to some degree, variable.
One example of a parameter which is usually, but not 2 always, fixed is the modulation type, such as FM or AM.
One example of a parameter which is usually, but not always, varlable i9 the operating frequancy or frequencies (channel).
At a given time, it may be desirabla to ad~ust the operating parameters in response to the current operating environment to obtain optimum performance. For example, it may be desirable to minimize interference to other users.
A significant factor in determining the current 3~ optimum operating parameters is the geographic location of the radio. As an example, a particular radio operating in a densely-populated area, such as downtown - 2 ~ ?~ CM-00239N
Los Angeles, California must contend with, among other factor~, a relatively large number of other radios using the same frequency spectrum. As a result, the available frequencies (channels) may be limited. Alss, the radio must limit its transmitting power to avoid interfering with neighboring users. On the other hand, if this identical radio were located in the middle of a sparsely-populated area, such as Death Valley, California, it would contend with few (if any) other radios using the same frequency spectrum. A~ a result, more channels are available and the transmitting power may be increased to achieve greater range without interfering with neighboring users.
For radios which are fixed in location, that is, non-mobile, usually there are few parameters, if any, which need to be varied during day-to-day operation. This is because the operating environment is relatively constant for the radio which is due, to a large extent, to the fact that the location of the radio is fixed.
For radios whose location is not fixed (that is, mobile), on the other hand, it is desirable for operating parameters to be ad;usted whenever a change in the location of the radio causes the operating environment to change. For example, using our above example, if a mobile radio initially selects an operating freguency band and transmit power while it is located in downtown Los Angeles, the radio may need to periodically adjust (change) these freguency band and power settings as its location constantly changes during the course of its journey from the downtown area to a final destination of Death Valley. Moreover, it also may be advantageGus to change other operating parameters during the course of such a journey.
Another situation where a mobile radio might need to adjust operating parameters based on its location arises in trunked radio systems. In such systems, many subscriber units share a fixed (and typically smaller) _ 3 _ ~ s~ ?3 CM-00239N
number of communication channels. In such systems, a common control station uses a control channel to allocate the shared channels amongst the subscriber units. When a subscriber wishes to place a call, it first tunes to the control channel and transmits a channel request message to the control station. Upon receipt of this message (and assuming an idle channel is available) the control station reserves, or assigns, an idle channel for the call. The control station then transmits the channel assignment information to the requesting subscriber via the control channel. Upon receipt of this channel assignment message, the requesting subscriber unit tunes to the assigned channel and procaeds to place its call.
A possible scenario which might arise in such trunked systems is a mobile subscriber unit which travels in geographic region A served by trunked system A with associated control channel A, and which mobile subscriber unit also travels in region B served by trunked system B
with associated control channel B. With present trunked radio ystems, no convenient mechanism exists to allow the subscriber unit to easily and readily change from one trunked system to another when travelling in this way.
In general, then, it is desirable for a mobile radio to have the ability to change operating parameters based on its current location. Given this fact, the question arisQs of how to effect the desired changes in the operating parameters. While it is obvious the human operator could manually adjust the operating parameters to obtain optimum performance, this could also prove to be risky. This is because, due to human error, the operator may be mistaken as to either the present location of the radio, or the current optimum operating parameters for the present location of the radio, or both.
~ 3 ~. ~ c ~ , CM-00239N
SummarY of the Invention Therefore, it is an object of the present invention to vary one or more operating parameters of a mobile radio automatically, and without human intervention, based on the location o~ the radio.
According to the invention, a method is provided, and an apparatus described, whereby one or more operating parameters of a mobile radio may be varied automatically, and without human intervention, based on the location of the radio.
Brief DescriPtion of the Drawinqs Fig. 1 depicts the location-based adaptive radio control arrangement.
Fig. 2 depicts a flow diagram illustrating the steps of the invention.
Detailed Descri~tion of the Invention The invention may be used with any location determining device or system (101), such as LORAN, satellite global positioning systems, or dead reckoning, and with any mobile radio having adjustable operating parameters. Such location determining systems are well understood and need not be described here in any further detail. (In the context of this invention, "mobile"
refers to a non-fixed location radio, and includes both vehicle mounted and personally carried radios.) The invention (100) is shown in Fig. 1.
Switch 1 (102) is arranged to select the operating frequency band of the radio. When switch 1 is in position designated "A", the radio operates on the 800 MHz band (103). When switch 1 is in the position designated "B", the radio operates on the 30 MHz band (104).
- 5 - ~ rls~ CM-00239N
Switch 2 (105) is arranged to select the output power level of the transmitter. When switch 2 is in the position designated "A", the output power is 10 Watts (106). When switch 2 is in the position designated "B", the output power is lO0 Watts (107).
Switch 3 (108) is arranged to select the control channel oP the radio. When switch 3 is in the position designated "A", the control channel selected is channel A
(109). When switch 3 is in position designated "B", the control channel selected is channel B (110).
The mobile radio (120) is equipped with a location determining device (101) which, ln turn, is arranged to control the position of switch l (102), switch 2 (105), and switch 3 (108). In this embodiment, the location determining device (lOl) is capable of determining whether the radio is located in location A
(the urban area) or location B (the rural area).
When the location determining device (lOl) determines the radio i9 located in location A, it causes switch l (102) to reside in position "A", thereby causing the radio to operate on the 800 MHz band. Also when the location determining device (lOl~ determines the radio is located in location A, it causes switch 2 (105) to resids in position ''Atl, thereby causing the radio to transmit at lO Watts power output. Finally, when the location determining device (lOl) determines the radio i5 located in location A, it causes switch 3 (108) to also reside in position "A", thereby causing the radio to use channel A
as a control channel.
When the location determining device ~lOl) determines the radio is located in location B, it causes switch l (102) to reside in position "B", thcreby causin~
the radio to operate on the 30 MHz band. Also when the location determining device (lOl) determines the radio is located in location B, it causes switch 2 (105) to reside in position "B", thereby causing the radio to transmit at lO0 Watts power output. Finally, when the location -- 6 - 3 3 ~ CM-00239N
determining device (101) determines the radio is located in location B, it causes switch 3 (108) to reside in position "B", thereby causing the radio to use channel B
as a control channel.
Fig. 2 shows the flow diagram (200) of the steps of the invention.
The process starts with the radio determining its location (201). If the radio determines it is located in a first predetermined location, such a~ location A (the urban area), the radio operates on the 800 MHz band (202), adjusts the transmitter to 10 Watts of output power (203), and uses channel A as a control channel (204). The radio then returns (220) to its initial determining step (201), and makes a new determination of its location.
In this embodiment, if the radio determines it is located in location B (the rural area), the radio operates on the 30 MHz band (212), adjusts it~
transmitter to 100 Watts o~ output power (213), and uses channel B as a control channel (214). The radio then returns (220) to its initial determining step (201), and makes a new determination of its location.
LOCATION-BASED ADAPTIVE RADIO CONTROL
Backqround of the Invention This invention pertains to radios.
Two-way radios have a number of operating parameters including, but not limited to, transmitting power, operating frequencies (channel), operating band, modulation type, modulation index, frequency deviation, squelch setting, channel spacing, control channel (for trunked communications), noise blanker characteristic, and receive bandwidth. Of these parameters, some are fixed, while others may be, to some degree, variable.
One example of a parameter which is usually, but not 2 always, fixed is the modulation type, such as FM or AM.
One example of a parameter which is usually, but not always, varlable i9 the operating frequancy or frequencies (channel).
At a given time, it may be desirabla to ad~ust the operating parameters in response to the current operating environment to obtain optimum performance. For example, it may be desirable to minimize interference to other users.
A significant factor in determining the current 3~ optimum operating parameters is the geographic location of the radio. As an example, a particular radio operating in a densely-populated area, such as downtown - 2 ~ ?~ CM-00239N
Los Angeles, California must contend with, among other factor~, a relatively large number of other radios using the same frequency spectrum. As a result, the available frequencies (channels) may be limited. Alss, the radio must limit its transmitting power to avoid interfering with neighboring users. On the other hand, if this identical radio were located in the middle of a sparsely-populated area, such as Death Valley, California, it would contend with few (if any) other radios using the same frequency spectrum. A~ a result, more channels are available and the transmitting power may be increased to achieve greater range without interfering with neighboring users.
For radios which are fixed in location, that is, non-mobile, usually there are few parameters, if any, which need to be varied during day-to-day operation. This is because the operating environment is relatively constant for the radio which is due, to a large extent, to the fact that the location of the radio is fixed.
For radios whose location is not fixed (that is, mobile), on the other hand, it is desirable for operating parameters to be ad;usted whenever a change in the location of the radio causes the operating environment to change. For example, using our above example, if a mobile radio initially selects an operating freguency band and transmit power while it is located in downtown Los Angeles, the radio may need to periodically adjust (change) these freguency band and power settings as its location constantly changes during the course of its journey from the downtown area to a final destination of Death Valley. Moreover, it also may be advantageGus to change other operating parameters during the course of such a journey.
Another situation where a mobile radio might need to adjust operating parameters based on its location arises in trunked radio systems. In such systems, many subscriber units share a fixed (and typically smaller) _ 3 _ ~ s~ ?3 CM-00239N
number of communication channels. In such systems, a common control station uses a control channel to allocate the shared channels amongst the subscriber units. When a subscriber wishes to place a call, it first tunes to the control channel and transmits a channel request message to the control station. Upon receipt of this message (and assuming an idle channel is available) the control station reserves, or assigns, an idle channel for the call. The control station then transmits the channel assignment information to the requesting subscriber via the control channel. Upon receipt of this channel assignment message, the requesting subscriber unit tunes to the assigned channel and procaeds to place its call.
A possible scenario which might arise in such trunked systems is a mobile subscriber unit which travels in geographic region A served by trunked system A with associated control channel A, and which mobile subscriber unit also travels in region B served by trunked system B
with associated control channel B. With present trunked radio ystems, no convenient mechanism exists to allow the subscriber unit to easily and readily change from one trunked system to another when travelling in this way.
In general, then, it is desirable for a mobile radio to have the ability to change operating parameters based on its current location. Given this fact, the question arisQs of how to effect the desired changes in the operating parameters. While it is obvious the human operator could manually adjust the operating parameters to obtain optimum performance, this could also prove to be risky. This is because, due to human error, the operator may be mistaken as to either the present location of the radio, or the current optimum operating parameters for the present location of the radio, or both.
~ 3 ~. ~ c ~ , CM-00239N
SummarY of the Invention Therefore, it is an object of the present invention to vary one or more operating parameters of a mobile radio automatically, and without human intervention, based on the location o~ the radio.
According to the invention, a method is provided, and an apparatus described, whereby one or more operating parameters of a mobile radio may be varied automatically, and without human intervention, based on the location of the radio.
Brief DescriPtion of the Drawinqs Fig. 1 depicts the location-based adaptive radio control arrangement.
Fig. 2 depicts a flow diagram illustrating the steps of the invention.
Detailed Descri~tion of the Invention The invention may be used with any location determining device or system (101), such as LORAN, satellite global positioning systems, or dead reckoning, and with any mobile radio having adjustable operating parameters. Such location determining systems are well understood and need not be described here in any further detail. (In the context of this invention, "mobile"
refers to a non-fixed location radio, and includes both vehicle mounted and personally carried radios.) The invention (100) is shown in Fig. 1.
Switch 1 (102) is arranged to select the operating frequency band of the radio. When switch 1 is in position designated "A", the radio operates on the 800 MHz band (103). When switch 1 is in the position designated "B", the radio operates on the 30 MHz band (104).
- 5 - ~ rls~ CM-00239N
Switch 2 (105) is arranged to select the output power level of the transmitter. When switch 2 is in the position designated "A", the output power is 10 Watts (106). When switch 2 is in the position designated "B", the output power is lO0 Watts (107).
Switch 3 (108) is arranged to select the control channel oP the radio. When switch 3 is in the position designated "A", the control channel selected is channel A
(109). When switch 3 is in position designated "B", the control channel selected is channel B (110).
The mobile radio (120) is equipped with a location determining device (101) which, ln turn, is arranged to control the position of switch l (102), switch 2 (105), and switch 3 (108). In this embodiment, the location determining device (lOl) is capable of determining whether the radio is located in location A
(the urban area) or location B (the rural area).
When the location determining device (lOl) determines the radio i9 located in location A, it causes switch l (102) to reside in position "A", thereby causing the radio to operate on the 800 MHz band. Also when the location determining device (lOl~ determines the radio is located in location A, it causes switch 2 (105) to resids in position ''Atl, thereby causing the radio to transmit at lO Watts power output. Finally, when the location determining device (lOl) determines the radio i5 located in location A, it causes switch 3 (108) to also reside in position "A", thereby causing the radio to use channel A
as a control channel.
When the location determining device ~lOl) determines the radio is located in location B, it causes switch l (102) to reside in position "B", thcreby causin~
the radio to operate on the 30 MHz band. Also when the location determining device (lOl) determines the radio is located in location B, it causes switch 2 (105) to reside in position "B", thereby causing the radio to transmit at lO0 Watts power output. Finally, when the location -- 6 - 3 3 ~ CM-00239N
determining device (101) determines the radio is located in location B, it causes switch 3 (108) to reside in position "B", thereby causing the radio to use channel B
as a control channel.
Fig. 2 shows the flow diagram (200) of the steps of the invention.
The process starts with the radio determining its location (201). If the radio determines it is located in a first predetermined location, such a~ location A (the urban area), the radio operates on the 800 MHz band (202), adjusts the transmitter to 10 Watts of output power (203), and uses channel A as a control channel (204). The radio then returns (220) to its initial determining step (201), and makes a new determination of its location.
In this embodiment, if the radio determines it is located in location B (the rural area), the radio operates on the 30 MHz band (212), adjusts it~
transmitter to 100 Watts o~ output power (213), and uses channel B as a control channel (214). The radio then returns (220) to its initial determining step (201), and makes a new determination of its location.
Claims (7)
1. A method for adjusting a radio comprising the steps of:
in said radio:
(a) determining said radio's location; and, (b) responsive to said determination, automatically adjusting at least one variable operating parameter.
in said radio:
(a) determining said radio's location; and, (b) responsive to said determination, automatically adjusting at least one variable operating parameter.
2. A method for adjusting a radio, comprising the steps of:
in said radio:
(a) determining when said radio is located within a predetermined region; and, (b) responsive to said determination, automatically adjusting at least one variable operating parameter.
in said radio:
(a) determining when said radio is located within a predetermined region; and, (b) responsive to said determination, automatically adjusting at least one variable operating parameter.
3. A method for adjusting a radio, comprising the steps of:
in said radio:
(a) determining which of several predetermined regions said radio is located within; and, (b) responsive to said determination, automatically adjusting at least one variable operating parameter.
in said radio:
(a) determining which of several predetermined regions said radio is located within; and, (b) responsive to said determination, automatically adjusting at least one variable operating parameter.
4. A method for adjusting a radio, comprising the steps of:
(a) determining said radio's distance from at least one predetermined fixed point; and, (b) responsive to said determination, automatically adjusting at least one variable operating parameter.
(a) determining said radio's distance from at least one predetermined fixed point; and, (b) responsive to said determination, automatically adjusting at least one variable operating parameter.
5. A radio having adjusting means, said adjusting means comprising:
means for determining said radio's location; and, means responsive to said determining means for automatically adjusting at least one variable operating parameter.
means for determining said radio's location; and, means responsive to said determining means for automatically adjusting at least one variable operating parameter.
6. A radio having adjusting means, said adjusting means comprising:
means for determining when said radio is located within a predetermined region; and, means responsive to said determining means for automatically adjusting at least one variable operating parameter.
means for determining when said radio is located within a predetermined region; and, means responsive to said determining means for automatically adjusting at least one variable operating parameter.
7. A radio having adjusting means, said adjusting means comprising:
means for determining which of several predetermined regions said mobile radio is located within; and, means responsive to said determining means for automatically adjusting at least one variable operating parameter.
means for determining which of several predetermined regions said mobile radio is located within; and, means responsive to said determining means for automatically adjusting at least one variable operating parameter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US25352988A | 1988-10-05 | 1988-10-05 | |
| US253,529 | 1988-10-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1317348C true CA1317348C (en) | 1993-05-04 |
Family
ID=22960653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000610392A Expired - Fee Related CA1317348C (en) | 1988-10-05 | 1989-09-06 | Location based adaptive radio control |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN1041676A (en) |
| AU (1) | AU4187789A (en) |
| CA (1) | CA1317348C (en) |
| IL (1) | IL91148A0 (en) |
| WO (1) | WO1990004293A1 (en) |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2681200A1 (en) * | 1991-09-05 | 1993-03-12 | Snecma | METHOD AND DEVICE FOR THE SIMULTANEOUS TRANSMISSION OF INFORMATION BETWEEN MOBILE AND RECEPTION STATION. |
| EP0544095B1 (en) * | 1991-11-25 | 2000-03-01 | Motorola, Inc. | Reduced interference through frequency partitioning in cellular comunnication systems |
| GB2271917B (en) * | 1992-02-06 | 1996-07-03 | Motorola Inc | Dual system cellular cordless radiotelephone apparatus and method |
| CA2105710A1 (en) * | 1992-11-12 | 1994-05-13 | Raymond Joseph Leopold | Network of hierarchical communication systems and method therefor |
| FI92782C (en) * | 1993-02-09 | 1994-12-27 | Nokia Mobile Phones Ltd | Grouping mobile phone settings |
| US5444868A (en) * | 1993-03-23 | 1995-08-22 | Ericsson Ge Mobile Communications Inc. | Modular mobile radio system |
| US5594947A (en) * | 1994-03-10 | 1997-01-14 | Motorola, Inc. | Method for providing alternate communication services based on geographic location |
| DE4426183C1 (en) * | 1994-07-23 | 1995-10-19 | Ant Nachrichtentech | Directional radio system for point-to-multipoint connections |
| JP3538907B2 (en) * | 1994-08-19 | 2004-06-14 | セイコーエプソン株式会社 | Broadcast wave receiver for mobile |
| US5666649A (en) * | 1994-09-01 | 1997-09-09 | Ericsson Inc. | Communications system having variable system performance capability |
| US6091954A (en) * | 1994-09-01 | 2000-07-18 | Telefonaktiebolaget Lm Ericsson | Channel assignment in enhanced fixed-plan mobile communications systems |
| US5579306A (en) * | 1994-09-01 | 1996-11-26 | Ericsson Inc. | Time and frequency slot allocation system and method |
| GB2323245A (en) * | 1997-03-14 | 1998-09-16 | Nokia Mobile Phones Ltd | Mobile phone |
| US6070085A (en) | 1997-08-12 | 2000-05-30 | Qualcomm Inc. | Method and apparatus for controlling transmit power thresholds based on classification of wireless communication subscribers |
| US6118995A (en) * | 1998-06-01 | 2000-09-12 | Motorola, Inc. | Subscriber unit and method for updating a function value |
| FR2782866A1 (en) * | 1998-08-31 | 2000-03-03 | Canon Europa Nv | Local radio link parameter adaptation device for office equipment communication, modifies link parameters in response to sensed proximity of equipment user |
| DE69935696T2 (en) * | 1998-08-31 | 2007-12-27 | Canon Europa N.V. | Adaptation of the radio transmission parameters of a wireless communication system |
| US6334059B1 (en) * | 1999-01-08 | 2001-12-25 | Trueposition, Inc. | Modified transmission method for improving accuracy for e-911 calls |
| DE10033135C2 (en) * | 2000-07-07 | 2002-05-23 | Microcom Gmbh | Procedure for automatic frequency switching in mobile radio |
| US6856807B1 (en) | 2000-09-07 | 2005-02-15 | Ericsson Inc. | Method to control the update frequency of a positioning device by a mobile terminal |
| KR100376582B1 (en) * | 2000-11-27 | 2003-03-17 | 에스케이 텔레콤주식회사 | Channel switching method for packet transmission in IMT-2000 system |
| US6701157B2 (en) * | 2001-06-27 | 2004-03-02 | Harris Corporation | Transmitter circuit architecture and method for reducing in-band noise in point to multipoint communication systems |
| US8977284B2 (en) | 2001-10-04 | 2015-03-10 | Traxcell Technologies, LLC | Machine for providing a dynamic data base of geographic location information for a plurality of wireless devices and process for making same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3906166A (en) * | 1973-10-17 | 1975-09-16 | Motorola Inc | Radio telephone system |
| DE3214155A1 (en) * | 1982-04-17 | 1983-10-20 | Blaupunkt-Werke Gmbh, 3200 Hildesheim | LOCAL BROADCAST RECEIVER, LIKE AUTORADIO OR THE LIKE. |
| US4550443A (en) * | 1982-11-12 | 1985-10-29 | Motorola, Inc. | Method and apparatus for dynamically selecting transmitters for communications between a primary station and remote stations of a data communications system |
| DE3607687A1 (en) * | 1986-03-08 | 1987-09-10 | Philips Patentverwaltung | METHOD AND CIRCUIT ARRANGEMENT FOR SWITCHING A RADIO CONNECTION INTO ANOTHER RADIO CELL OF A DIGITAL RADIO TRANSMISSION SYSTEM |
-
1989
- 1989-07-28 IL IL91148A patent/IL91148A0/en unknown
- 1989-08-14 AU AU41877/89A patent/AU4187789A/en not_active Abandoned
- 1989-08-14 WO PCT/US1989/003452 patent/WO1990004293A1/en unknown
- 1989-09-06 CA CA000610392A patent/CA1317348C/en not_active Expired - Fee Related
- 1989-09-27 CN CN89107518A patent/CN1041676A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO1990004293A1 (en) | 1990-04-19 |
| AU4187789A (en) | 1990-05-01 |
| IL91148A0 (en) | 1990-03-19 |
| CN1041676A (en) | 1990-04-25 |
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| Date | Code | Title | Description |
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| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20020506 |