AU774000B2 - Apparatus and methods for adapting mobile unit to wireless LAN - Google Patents
Apparatus and methods for adapting mobile unit to wireless LAN Download PDFInfo
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- AU774000B2 AU774000B2 AU58375/99A AU5837599A AU774000B2 AU 774000 B2 AU774000 B2 AU 774000B2 AU 58375/99 A AU58375/99 A AU 58375/99A AU 5837599 A AU5837599 A AU 5837599A AU 774000 B2 AU774000 B2 AU 774000B2
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- mobile unit
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Description
S F Ref: 485037
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT
ORIGINAL
Name and Address of Applicant: Actual Inventor(s): Address for Service: Invention Title: Symbol Technologies, Inc.
One Symbol Plaza Holtsville New York 11742 UNITED STATES OF AMERICA John Hughes, Gurpreet Singh Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia Apparatus and Methods for Adapting Mobile Unit to Wireless LAN r The following statement is a full description of this invention, best method of performing it known to me/us:including the 5845 -1-
SPECIFICATION
APPARATUS AND METHODS FOR ADAPTING MOBILE UNIT TO WIRELESS
LAN
CROSS-REFERENCE TO RELATED APPLICATIONS This application is related to copending U.S. Patent Application Serial No.
08/747,034, entitled "Power-Saving Arrangement and Method for Mobile Units in o0 Communications Network", filed October 27, 1995, now U.S. Patent No. 6.002,918, herein expressly incorporated by reference.
BACKGROUND OF THE INVENTION S 15 1. Field of the Invention The invention relates to data communication systems, and more particularly to a wireless local area network (LAN) communication system in which mobile units associate with stationary access points having communications characteristics defined by 20 the particular country in which the LAN is installed.
2. The Backround Art 2. The Background Art [R\LBQ]02162doc:mx SYM-0665 A wireless LAN may be implemented by remote mobile units (mobile units) that send messages to and receive messages from base stations or Stationary Access Points (Stationary Access Points) using wireless infrared or radio communication links. Each Stationary Access Point covers a limited area, so a typical network may have several Stationary Access Points.
One protocol that may be used is the IEEE 802.11 Standard which is a standard that defines physical and data link layers for wireless local networks. The standard defines, among other things, the wireless LAN medium access control (MAC) and physical (PHY) layer specifications.
For a message to be transmitted, a mobile unit first becomes associated with an Stationary Access Point. Association refers to the process of synchronizing a mobile unit S with an Stationary Access Point for communication, and is initiated by the mobile unit.
The mobile unit first listens to the broadcasts over the airwaves and determines which Stationary Access Points are within range of the mobile unit, and then requests association with a particular Stationary Access Point according to certain criteria. At any S point in time, a mobile unit is typically associated with only one Stationary Access Point.
A single Stationary Access Point can be associated with multiple mobile units.
-3- With the ever-growing global market, it is common for users to travel from country to country. A problem therefore occurs, in that one country may allocate a different portion of the frequency spectrum to wireless communications than another country. Additionally, different countries may have different regulations regarding power output of wireless communications. These allocations and regulations may prevent a mobile unit which is designed for use in one country from working (or being allowed to work) in another country.
What is needed, then, is a system and method for allowing a mobile unit to meet regulatory requirements and adapt to and communicate with Stationary Access Points io having different communication characteristics.
BRIEF DESCRIPTION OF THE INVENTION The present invention relates to an apparatus and method for automatically
V.
0' adapting a mobile unit to communication requirements of a particular country or s15 geographic region. An aspect of the present invention provides a method for operating a wireless data communications network including a mobile unit and one or more access points, wherein the method includes the steps of: receiving in the mobile unit announcement messages broadcast by one or more of the access points, each of said •ego "message having a unique frequency characteristic associated with the geographic location •ego of the access point from which it was sent; determining, in said mobile unit, an allowable co°"i frequency set in the geographic region associated with the access point from which each of said messages was sent; and adjusting the frequency set of the mobile unit to send messages on said allowable frequency set. Other operating characteristics may be adjusted in a similar fashion.
[R:\L1BQ]02162.doc:mxl -3a- Another aspect of the present invention provides a method for operating a mobile unit, the mobile unit designed for use in a wireless network and located in a geographic region, the method comprising the steps of: scanning the frequency spectrum until an announcement message from an access point is detected; examining the frequency characteristics of said announcement message; comparing said frequency characteristics with a table in memory; determining the geographic region by matching said frequency characteristics with a geographic region listed in said table, said table also listing a frequency range for each geographic region; and adjusting the operating frequency range of the mobile unit to correspond with said frequency range corresponding to the geographic region.
A further aspect of the present invention provides a mobile unit for use in a 'wireless data communications network including one or more access points, wherein the frequency set of the mobile unit may be modified and the mobile unit includes: a receiver which receives in the mobile unit announcement messages broadcast by one or more of the access points, each of said messages having a unique frequency characteristic associated with the geographic location of the access point from which it was sent; 4 *444 a processing unit, which determines an allowable frequency set in the geographic S4 region associated with the access point from which each of said messages was sent; and a frequency set adjuster, which adjusts the frequency set to send messages on said allowable frequency set.
A still further aspect of the present invention provides a mobile unit for use in a wireless network, the mobile unit located in a geographic region and including: [R:\LIBQ]02162.doc:mxl -4a frequency scanner, which scans the frequency spectrum until an announcement message from an access point is detected; a frequency characteristics detector, which examines the frequency characteristics of said announcement message; a comparator, which compares said frequency characteristics with a table in memory; a determiner, which determines the geographic region by matching said frequency characteristics with a geographic region listed in said table, said table also listing a frequency range for each geographic region; and a frequency adjuster, which adjusts the operating frequency range of the mobile unit to correspond with said frequency range corresponding to the geographic region.
BRIEF DESCRIPTION OF THE DRAWING FIGURES FIG. 1 is a block diagram showing a wireless network architecture.
FIG. 2 is a flow diagram illustrating a method for operating a wireless data communications network according to a presently preferred embodiment of the present 9 S: invention.
DETAILED DESCRIPTION OF THE INVENTION Those of ordinary skill in the art will realize that the following description of the present invention is illustrative only and not in any way limiting. Other embodiments of the invention will readily suggest themselves to such skilled persons.
FIG. 1 is a block diagram showing a wireless network architecture. Host 10 is connected to Stationary Access Point 12 and Stationary Access Point 14. Stationary [R:\LIBQ]02162.doc:mxl SYM-0665 Access Point 12 handles wireless communications within area 16, and Stationary Access Point 14 handles communications within area 18. As shown in FIG. 1, therefore, Stationary Access Point 12 is in communication range of mobile unit 20 and mobile unit 22, and Stationary Access Point 14 is in communication range of mobile unit 20 and mobile unit 24. Mobile unit 20 is in communication range of either Stationary Access Point 12 or Stationary Access Point 14, although mobile unit 20 preferably only communicates with one of them at a time.
In one scenario, mobile unit 20 associates with an Stationary Access Point, for example Stationary Access Point 12, and thereafter communicates with Stationary Access Point 12 to transmit messages to the host or to other mobile units. If mobile unit 20 is associated with Stationary Access Point 12, mobile unit 20 could transmit a message to .ooo mobile unit 22 via Stationary Access Point 12, or to mobile unit 24 via Stationary Access Point 12, host 10, and Stationary Access Point 14.
In a preferred embodiment of the invention, a grouping of hosts and/or mobile units make up a wireless local area network (LAN).
Systems similar to the one depicted in FIG. 1 are found throughout the world.
Each system, however, typically has different operating parameters in each country.
SYM-0665 According to a preferred embodiment of the present invention, a mobile unit is designed which may operate at a variety of different frequencies. The range of frequencies should be large enough to encompass some of the frequencies available for wireless communications in each country or geographic region in which the mobile unit may operate. Additionally, the mobile unit is designed to operate at a variety of different power settings, again with the range of power settings large enough to encompass at least some allowable power settings in each country in which the mobile unit may operate.
These features allow the mobile unit to operate in a variety of different countries or geographic regions.
Furthermore, the mobile unit is designed to automatically configure itself for use in individual countries or geographic regions. This may be accomplished by running a program or method contained in either software or hardware within the mobile unit. FIG.
2 is a flow diagram illustrating the method according to a preferred embodiment of the 15 present invention. At step 50, the mobile unit scans the frequency spectrum, listening fobi announcement messages broadcast by access points. This may encompass tuning to each available frequency an announcement message from a nearby access point is received.
The announcement message will have a frequency characteristic that is unique to a S particular geographic region or country.
SYM-0665 At step 52, the frequency characteristics of the received announcement message are compared with a table or equivalent data structure contained in memory. The table may contain a listing of the breakdown of the frequency spectrum for all the different available countries or geographic regions. It also may list regulations on power output or other regulations important to the functioning of the mobile unit. At step 54, a matching country or geographic region is found. At this point, the mobile unit has determined what country or geographic region in which it is operating. At step 56; the mobile unit adjusts its operating frequency range to correspond to the country or geographic region in which it is operating. It may also alter other operating characteristics, such as power output and modulation type, in accordance with the regulations listed in the table or other data structure corresponding to the country in which the unit is located.
After the geographic region frequency and power settings (and any other operating characteristics) have been adapted for use in the country or geographic region in which 15 the unit is located, the mobile unit operates similarly to a conventional mobile unit.
Some regulations require that the regulations themselves be displayed to the user.
Normally, these regulations would be placed on the outer surface of a unit capable of S transmitting in the country. However, since the unit of the present invention may be capable of transmission in many different countries, this may not be feasible. Therefore, SYM-0665 the unit may be configured such that, after the unit has determined the country in which it is located, the proper regulatory information is displayed to the user.
Referring back to FIG. 1, Stationary Access Point 12, Stationary Access Point 14, and host 10 may be implemented in hardware or software or a combination of hardware and software. Mobile unit 22, mobile unit 20 and mobile unit 24 may be implemented as programmable processor-based units executing software modules. An embodiment of the process performed by the software modules is described below. In one embodiment, mobile units 20, 22 and 24 are hand-held data-gathering units.
The contents of U.S. Patent No. 5,029,183 to Tymes, and U.S. Patent No.
5,668,803 to Tymes et al., both assigned to Symbol Technologies, Inc., are hereby S incorporated by reference herein. These patents show systems in which methods and apparatus consistent with the principles of the present invention may be practiced. Each 15 patent describes a system in which hand-held data-gathering mobile units communicate via wireless link with Stationary Access Points, similar to the system shown in FIG. 1.
In another embodiment of the present invention, the mobile unit may be configured so that the user must verify the country in which they are located. For example, if the mobile unit determines through looking at the table that it is currently SYM-0665 located in Switzerland, a message may appear on a display screen on the mobile unit saying "You are in Switzerland. Is this correct? The user may then be required to confirm that they are indeed in Switzerland before the mobile unit reconfigures its settings to comply with Swiss standards. This reduces the chance of the unit mistakenly configuring itself to specific characteristics which may violate certain regulations.
In another embodiment of the present invention, a Global Positioning System (GPS) locator may be built into the mobile unit, allowing the unit to verify its location instead of or in addition to requiring confirmation from the user. This feature also reduces the chance of the unit mistakenly configuring itself to specific characteristics which may violate certain regulations.
4. In another embodiment of the present invention, the multiple geographic region i: feature (the feature embodied by the above methods) may be enabled or disabled by a 15 user. When the feature is disabled, the mobile unit merely attempts to establish communication using a communication setting for a particular geographic region. This setting may be, for example, a default setting or the setting in use at the time the mobile -oooo unit was last turned off.
While embodiments and applications of this invention have been shown and SYM-0665 described, it would be apparent to those skilled in the art that many more modifications than mentioned above are possible without departing from the inventive concepts herein.
The invention, therefore, is not to be restricted except in the spirit of the appended claims.
Claims (44)
1. A method for operating a wireless data communications network including a mobile unit and one or more access points, wherein the method includes the steps of: receiving in the mobile unit announcement messages broadcast by one or more of the access points, each of said messages having a unique frequency characteristic associated with the geographic location of the access point from which it was sent; determining, in said mobile unit, an allowable frequency set in the geographic region associated with the access point from which each of said messages was sent; and adjusting the frequency set of the mobile unit to send messages on said allowable frequency set. *e
2. The method of claim 1, wherein said determining step includes the steps of: comparing said unique frequency characteristics of said messages to a table stored in memory, said table containing a listing of various allowable frequency sets for corresponding to different geographic regions; matching said unique frequency characteristics to a single geographic region in the .ooooi table; and referring to said allowable frequency set corresponding to said single geographic region.
3. The method of claim 2, wherein said table further includes a listing of various SYM-0665 allowable power output levels corresponding to different geographic regions.
4. The method of claim 3, further including the steps of: referring to said allowable power output levels corresponding to said single geographic region; and adjusting the power output level of the mobile unit to operate within said allowable power output levels.
The method of claim 2, wherein said table further includes a listing of various regulations corresponding to different geographic regions.
6. The method of claim 5, further including the step of: displaying said regulations corresponding to the geographic region in which the unit is located to a user.
7. The method of claim 6, further including the steps of: *"referring to said regulations corresponding to said single geographic region; and adjusting the operating characteristics of the mobile unit to comply with said regulations.
8. The method of claim 1, wherein the mobile units are hand-held data gathering S units.
9. The method of claim 1, further including the steps of: sending a message to a user to verify that said geographic region that the mobile SYM-0665 unit determines is associated with said access point is correct; and transmitting only if said user verifies that said geographic region that the mobile unit determinds is associated with said access point is correct.
10. The method of claim 1, further including the steps of: utilizing a Global Positioning System locator to verify the geographic region in which the mobile unit is located; and transmitting only if said Global Positioning System locator verifies that said geographic region that the mobile unit determines is associated with said access point is correct.
11. The method of claim 1, wherein a user may disable the feature which executes the method.
12. A method for operating a mobile unit, the mobile unit designed for use in a S wireless network and located in a geographic region, the method comprising the steps of: :.'":scanning the frequency spectrum until an announcement message from an access point is detected; examining the frequency characteristics of said announcement message; comparing said frequency characteristics with a table in memory; determining the geographic region by matching said frequency characteristics with a geographic region listed in said table, said table also listing a frequency range for each S: geographic region; and adjusting the operating frequency range of the mobile unit to correspond with said frequency range corresponding to the geographic region. SYM-0665
13. The method of claim 12, wherein said table further includes a listing of various allowable power output levels corresponding to each geographic region.
14. The method of claim 13, further including the step of adjusting the power output level of the mobile unit to correspond with said allowable power output levels corresponding to the geographic region.
The method of claim 12, wherein said table further includes a list of various regulations corresponding to each geographic region.
16. The method of claim 15, further including the step of: displaying said regulations corresponding to the geographic region in which the unit is located to a user.
17. The method of claim 15, further including the step of adjusting the operating characteristics of the mobile unit to correspond with said regulations corresponding to the geographic region.
18. The method of claim 12, wherein the mobile unit is a hand-held data gathering unit.
19. The method of claim 12, further including the steps of: sending a message to a user to verify that the geographic region determined by the mobile unit is correct; and SYM-0665 transmitting only if said user verifies that the geographic region determined by the mobile unit is correct.
The method of claim 12, further including the steps of: utilizing a Global Positioning System locator to verify the geographic region in which the mobile unit is located; transmitting only if said Global Positioning Sensor locator verifies that the geographic region determined by the mobile unit is equivalent to the geographic region in which the mobile unit is located.
21. The method of claim 12, wherein a user may disable the feature which executes the method.
22. A mobile unit for use in a wireless data communications network including one or more access points, wherein the frequency set of the mobile unit may be modified and the S mobile unit includes: receiver which receives in the mobile unit announcement messages broadcast by one or more of the access points, each of said messages having a unique frequency characteristic associated with the geographic location of the access point from which it was sent; a processing unit, which determines an allowable frequency set in the geographic region associated with the access point from which each of said messages was sent; and a frequency set adjuster, which adjusts the frequency set to send messages on said allowable frequency set. SYM-0665
23. The mobile unit of claim 22, wherein said processing unit includes: a comparator, which compares said unique frequency characteristics of said messages to atable stored in memory, said table containing a listing of various allowable frequency sets for corresponding to different geographic regions; a matcher, which matches said unique frequency characteristics to a single geographic region in the table; and a first reader, which refers to said allowable frequency set corresponding to said single geographic region.
24. The mobile unit of claim 23, wherein said table further includes a listing of various allowable power output levels corresponding to different geographic regions.
The mobile unit of claim 24, wherein the power output level of the mobile unit may be adjusted and the mobile unit includes: "1 a second reader, which refers to said allowable power output levels corresponding to said single geographic region; and a power output level adjuster, which adjusts the power output level of the mobile unit to operate within said allowable power output levels.
26. The mobile unit of claim 23, wherein said table further includes a listing of various regulations corresponding to different geographic regions.
27. The mobile unit of claim 26, further including a display, which displays said regulations corresponding to the geographic region in which the unit is located to a user. SYM-0665
28. The mobile unit of claim 26, wherein the operating characteristics of the mobile unit may be adjusted and the mobile unit includes: a third reader, which refers to said regulations corresponding to said single geographic region; and an operating characteristics adjuster, which adjusts the operating characteristics of the mobile unit to comply with said regulations.
29. The mobile unit of claim 22, wherein the mobile unit is a hand-held data gathering unit. The mobile unit of claim 22, further including: a display; a display transmitter, which sends a message to the display so that a user may T5 verify that said geographic region that the mobile unit determines is associated with the S access point is correct; and a wireless transmitter, which transmits only if said user verifies that said geographic region that the mobile unit determines is associated with said access point is correct.
S
31. The mobile unit of claim 22, further including: a Global Positioning System locator, which verifies the geographic region in which the mobile unit is located; and a wireless transmitter, which transmits only if said Global Positioning System locator verifies that said geographic region that the mobile unit determines is associated SYM-0665 with said access point is correct.
32. The mobile unit of claim 22, wherein a user may disable the multiple geographic region feature.
33. A mobile unit for use in a wireless network, the mobile unit located in a geographic region and including: a frequency scanner, which scans the frequency spectrum until an announcement message from an access point is detected; a frequency characteristics detector, which examines the frequency characteristics of said announcement message; a comparator, which compares said frequency characteristics with a table in memory; a determiner, which determines the geographic region by matching said frequency "15 characteristics with a geographic region listed in said table, said table also listing a frequency range for each geographic region; and a frequency adjuster, which adjusts the operating frequency range of the mobile unit to correspond with said frequency range corresponding to the geographic region.
34. The mobile unit of claim 33, wherein said table further includes a listing of eeeee S: various allowable power output levels corresponding to each geographic region.
35. The mobile unit of claim 33, further including a power output adjuster, which adjusts the power output level of the mobile unit to correspond with said allowable power output levels corresponding to the geographic region. SYM-0665
36. The mobile unit of claim 33, wherein said table further includes a list of various regulations corresponding to each geographic region.
37. The mobile unit of claim 36, further including a display, which displays said regulations corresponding to the geographic region in which the unit is located to a user.
38. The mobile unit of claim 36, further including an operating characteristics adjuster, which adjusts the operating characteristics of the mobile unit to correspond with said regulations corresponding to the geographic region.
39. The mobile unit of claim 33, wherein the mobile unit is a hand-held data gathering unit.
The mobile unit of claim 33, further including: a display; a display transmitter, which sends a message to said display so that a user may verify that the geographic region determined by the mobile unit is correct; and a wireless transmitter, which transmits only if said user verifies that the geographic region determined by the mobile unit is correct.
41. The mobile unit of claim 33, further including: a Global Positioning System locator, which verifies the geographic region in which the mobile unit is located; and a wireless transmitter, which transmits only if said Global Positioning Sensor locator verifies that the geographic region determined by the mobile unit is equivalent to the geographic region in which the mobile unit is located.
42. The mobile unit of claim 33, wherein a user may disable the multiple geographic region feature.
43. A method for operating a wireless data communications network substantially as described herein with reference to Figs. 1 and 2 of the drawings.
44. A method for operating a mobile unit substantially as described herein with reference to Figs. 1 and 2 of the drawings. A mobile unit substantially as described herein with reference to Figs. 1 and 2 of the drawings. "DATED this Ninth Day of November, 1999 Symbol Technologies, Inc. t. Patent Attorneys for the Applicant 20 SPRUSON FERGUSON 0o 0• [R.\LIBU]I 5072.doc:mxl
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU58375/99A AU774000B2 (en) | 1999-11-09 | 1999-11-09 | Apparatus and methods for adapting mobile unit to wireless LAN |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU58375/99A AU774000B2 (en) | 1999-11-09 | 1999-11-09 | Apparatus and methods for adapting mobile unit to wireless LAN |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU5837599A AU5837599A (en) | 2001-05-10 |
| AU774000B2 true AU774000B2 (en) | 2004-06-10 |
Family
ID=3743691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU58375/99A Expired AU774000B2 (en) | 1999-11-09 | 1999-11-09 | Apparatus and methods for adapting mobile unit to wireless LAN |
Country Status (1)
| Country | Link |
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| AU (1) | AU774000B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5613204A (en) * | 1994-12-22 | 1997-03-18 | Bell Atlantic Mobile Systems, Inc. | Beacon system for roaming cellular stations |
| GB2308946A (en) * | 1995-12-22 | 1997-07-09 | Spectronics Micro Syst Ltd | Channel Allocation for Registering in a Cellular Radio Network |
| US5930710A (en) * | 1996-03-07 | 1999-07-27 | Telefonaktiebolaget L M Ericsson | Control/pilot channel reselection between cells belonging to different registration areas |
-
1999
- 1999-11-09 AU AU58375/99A patent/AU774000B2/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5613204A (en) * | 1994-12-22 | 1997-03-18 | Bell Atlantic Mobile Systems, Inc. | Beacon system for roaming cellular stations |
| GB2308946A (en) * | 1995-12-22 | 1997-07-09 | Spectronics Micro Syst Ltd | Channel Allocation for Registering in a Cellular Radio Network |
| US5930710A (en) * | 1996-03-07 | 1999-07-27 | Telefonaktiebolaget L M Ericsson | Control/pilot channel reselection between cells belonging to different registration areas |
Also Published As
| Publication number | Publication date |
|---|---|
| AU5837599A (en) | 2001-05-10 |
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| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |