Method and apparatus for scanning existing networks in TVWS
A method and an apparatus for scanning existing networks in TV White Space are disclosed. For scanning existing networks at a station to operate as an unlicensed device in a regulatory domain where a licensed device and the unlicensed device are permitted to operate, the method comprises: receiving a white space map (WSM) comprising information for available channels to be used for the unlicensed device to operate a wireless local area network (WLAN) operation and maximum transmission powers allowed for each of the available channels from an enabling station, wherein the enabling station is a station determining the available channels at its location using its own geographic location identification and a regulatory database access capability; and scanning the existing networks on the available channels identified within the received WSM.
1. A method of scanning existing networks at a first station in a communication system, the method comprising:
receiving, by a first station, a white space map (WSM) comprising information for available channels and maximum transmission powers allowed for each of the available channels from a second station, the WSM being generated by the second station based on information from a database; and
scanning, by the first station, the existing networks on the available channels identified within the received WSM,
wherein scanning the existing networks comprises:
transmitting a probe request frame to an access point (AP) responding station of a basic service set (BSS) on a specific channel among the available channels identified by the received WSM, and
receiving a probe response frame comprising another WSM from the responding station, and
wherein the scanning is a process for determining if there is a network, among the existing networks, to which the first station can be connected.
2. The method of claim 1 , wherein:
the first station is a dependent station;
the second station is an enabling station; and
the dependent station is a station receiving the information for the available channels from the enabling station that enables the operation of the dependent station.
3. The method of claim 2 , further comprising:
receiving, at the dependent station, an updated WSM from the enabling station or a dependent AP station,
wherein the dependent station scan the existing networks on the available channels identified within the updated WSM.
4. The method of claim 1 , wherein the first station operates only within the available channels identified by the WSM.
5. The method of claim 1 , wherein the WSM is received via one of beacon frame, a probe response frame, and a white space map announcement frame.
6. The method of claim 1 , further comprising receiving a frame comprising an updated WSM from the second station.
7. An apparatus for scanning existing networks in a communication system, the apparatus comprising a first station, comprising:
a transceiver configured to receive a white space map (WSM) comprising information for available channels and maximum transmission powers allowed for each of the available channels from a second station, the WSM being generated by the second station based on information from a database; and
a processor configured to control scanning the existing networks on the available channels identified within the received WSM,
wherein the processor is configured to control the transceiver to:
transmit a probe request frame to an access point (AP) station of a basic service set (BSS) on a specific channel among the available channels identified by the received WSM, and
receive a probe response frame comprising another WSM from the responding station, and
wherein the scanning is a process for determining if there is a network among the existing networks that the first station can be connected.
8. The apparatus of claim 7 , wherein:
the apparatus is configured to operate as a dependent station;
the second station is an enabling station; and
the dependent station is a station receiving the information for the available channels from the enabling station that enables the operation of the dependent station.
9. The apparatus of claim 8 , wherein the processor is further configured to scan the existing networks on the available channels identified within an updated WSM, when the transceiver receives the updated WSM from the enabling station.
10. The apparatus of claim 7 , wherein the processor is configured to control the apparatus to operate only within the available channels identified by the WSM.
11. The apparatus of claim 7 , wherein the WSM is received via one of beacon frame, a probe response frame, and a white space map announcement frame.
12. The apparatus of claim 7 , wherein the processor is further configured to control the transceiver to receive, from the second station, a frame comprising an updated WSM.