Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2006-04-04
2006-04-04
Trost, William (Department: 2683)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S432200, C342S455000, C342S018000, C342S196000
Reexamination Certificate
active
07024188
ABSTRACT:
The invention discloses a method for use in a wireless communications system with a plurality of broadcasting nodes, comprising the step of enabling one node in the system to function as a central node in said system and letting said node enable measurements on at least one frequency in a frequency band used by the system. Said measurements are carried out to detect if said at least one frequency is being utilized by a transmitter foreign to the system. Preferably, the measurement is enabled by means of the node transmitting a message to other nodes in the system, said message being a message pre-defined within the system as a message prohibiting all nodes from transmitting during a certain interval, said message being transmitted after the system has been detected by the node to be silent during a predefined interval between frame transmissions from the nodes in the system.
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Kerry et al.; “Liaison Statement on the Compatibility Between IEEE 802. 11a and Radars in the Radiolocation and Radionavigation Service in the 520-5350 MHz and 5470-5725 MHz Bands”; IEEE 802 AD Hoc Regulatory [Online], Jan. 17, 2001, pp. 1-6m XO002180310.
Johansson Fredrik
Khun-Jush Jamshid
Larsson Peter
Lindskog Jan
Pauli Mathias
Doan Kiet
Telefonaktiebolaget L M Ericsson (publ)
Trost William
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