Apparatus and method for wireless local area networks of different countries
Described are apparatus and methods for adapting a mobile unit to communication requirements of a particular country or geographic region. A wireless local area network communications system may include access points and remote terminals. Remote terminals may use country-specific information in messages from an access point to adapt to the communications requirements of the country in which the access point is operating. The country-specific information may be in a broadcast transmission or a message sent in reply to a remote terminal probe message. The country-specific information may include operating requirements such as channel information, power information, country name, modulation information, etc.
1. A universal remote terminal for use in wireless local area networks in a plurality of geographic areas, the terminal comprising circuitry configured to:
scan to find a communications channel carrying a communication for a nearby wireless local area network having particular communications specifications for operating in a particular geographic area;
send a probe communications message on the communications channel in response to finding the communications channel when scanning, the probe message including country-specific information for operating on the wireless local area network; and
adapt to that geographic area's communication specifications based on information specific to the geographic area received by the universal remote terminal in response to the probe message.
2. The universal remote terminal of claim 1 , wherein the remote terminal is mobile and handheld, and the remote terminal comprises wireless-network-interface resources comprising the circuitry.
3. The universal remote terminal of claim 1 , wherein the remote terminal is a desktop personal computer having wireless-network-interface resources comprising the circuitry.
4. The universal remote terminal of claim 1 , wherein the circuitry that is configured to scan is configured to scan frequencies for a broadcast transmission.
5. The universal remote terminal of claim 4 , wherein the circuitry that is configured to scan is configured to scan for the broadcast transmission when the terminal seeks to associate with a new access point.
6. The universal remote terminal of claim 1 , for use in wireless local area networks in which an access point comprises a transmitter, wherein:
the circuitry that is configured to scan is configured to scan a plurality of channels to receive a broadcast transmission when seeking to associate with a new access point;
the circuitry is configured to receive the broadcast transmission on one of the channels; and
the circuitry that is configured to send the probe communications message is configured to send the probe communications message requesting information specific to a geographic area on the one channel in response to receiving the broadcast transmission.
7. The universal remote terminal of claim 6 , wherein the circuitry is configured to scan channels on which the terminal is operable.
8. The universal remote terminal of claim 1 , wherein the circuitry is configured to include a database of communications specifications for a plurality of geographic areas.
9. The universal remote terminal of claim 1 , wherein the circuitry is configured to receive the information specific to the geographic area on that geographic area's communications specification for the transmitter.
10. The universal remote terminal of claim 9 , wherein the circuitry is configured to receive the information specific to the geographic area on a particular set of frequency channels on which wireless local area networks in that geographic area are to operate.
11. The universal remote terminal of claim 9 , wherein the circuitry is configured to:
be operable on a plurality of channels; and
receive information specific to a geographic area on a particular subset of the plurality of channels on which wireless local area networks in that geographic area are to operate.
12. The universal remote terminal of claim 1 , wherein the remote terminal uses spread spectrum communications and the circuitry is configured to receive information specific to a geographic area on variable parameters in spread spectrum communications.
13. The universal remote terminal of claim 1 , wherein the geographic areas include different countries.
14. A method for use in a remote terminal for use in wireless local area networks in a plurality of geographic countries, the method comprising:
scanning to find a communications channel carrying a communication for a nearby wireless local area network having particular communications specifications for operating in a particular geographic area;
sending a probe communications message on the communication channel in response to finding the communications channel when scanning, the probe message including country-specific information for operating on the wireless local area network; and
adapting to that geographic area's communication specifications based on information specific to the geographic area received by the universal remote terminal in response to the probe message.
15. The method of claim 14 , wherein the remote terminal is a mobile handheld remote terminal and the adapting occurs at the mobile handheld remote terminal.
16. The method of claim 14 , wherein the remote terminal is a desktop personal computer and the adapting occurs at the desktop personal computer.
17. The method of claim 14 , wherein the scanning comprises scanning for a broadcast transmission.
18. The method of claim 14 , wherein the scanning comprises scanning for a communication that is from an access point when the remote terminal seeks to associate with a new access point.
19. The method of claim 14 , wherein:
the scanning comprises scanning to receive a broadcast transmission from an access point when seeking to associate with a new access point; and
the sending comprises sending a probe message requesting information specific to a geographic area in response to receiving the broadcast transmission.
20. The method of claim 19 , wherein:
the scanning comprises scanning a plurality of channels to receive the broadcast transmission on one of the channels; and
the sending comprises sending the probe message on the one channel on which the broadcast transmission was received.
21. The method of claim 14 , further comprising including a database of communications specifications for a plurality of geographic areas at the remote terminal.
22. The method of claim 14 , wherein the information specific to the geographic area is on that geographic area's communications specification from the transmitter.
23. The method of claim 21 , wherein the information specific to the geographic area includes information on a particular set of frequency channels on which wireless local area networks in that geographic area are to operate.
24. The method of claim 23 , comprising:
using a plurality of channels to communicate in different geographic areas; and
the information specific to the geographic area includes information on a particular subset of the plurality of channels on which wireless local area networks in that geographic area are to operate.
25. The method of claim 14 , wherein the information specific to the geographic area includes information on variable parameters in spread spectrum communications.