Radio communication system employing spectral reuse transceivers
First Claim
1. A method of conducting communications between respective transceivers of a communication network using a selected portion of a prescribed communication bandwidth containing a plurality of sub-bandwidth communication channels, said method comprising the steps of:
- (a) monitoring said prescribed communication bandwidth for the presence of communication activity on said sub-bandwidth communication channels, and identifying those ones of said sub-bandwidth communication channels which are absent communication activity as clear channels available for use by said respective transceivers; and
(b) causing said respective transceivers to conduct communications therebetween using selected ones of said clear channels identified in step (a) and processing identifications of clear channels within a modulated filter bank containing an inverse fast Fourier transform operator and a polyphase filter, and deriving therefrom a plurality of carrier frequencies respectively corresponding to said selected ones of said clear channels;
wherein said communication network contains a master site transceiver and a plurality of remote site transceivers, and wherein communications within said network are between said master site transceiver and said remote site transceivers; and
wherein step (a) comprises the steps of;
(a1) causing said master site transceiver to transmit a prescribed message that is detectable by each of said remote site transceivers and, in response to said prescribed message, causing each remote site transceiver to monitor said prescribed communication bandwidth for effective communication activity on said sub-bandwidth communication channels, and to identify which of said sub-bandwidth communication channels appear to said each remote site transceiver to be absent effective communication activity and thereby constitute clear channels available for use,(a2) causing each remote site transceiver to transmit to said master site transceiver a message identifying clear channels identified thereby in step (a1), and(a3) causing said master site transceiver to broadcast to each of said remote site transceivers a communication control message containing an aggregate identification of clear channels based upon clear channel identifying messages transmitted by said remote site transceivers to said master site transceiver in step (a2).
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0 Petitions
Accused Products
Abstract
A spectral reuse transceiver-based communication system conducts communications between a master site and a plurality of remote sites using a selected portion of a communication bandwidth containing a plurality of sub-bandwidth channels. Each remote site transceiver monitors the communication bandwidth for activity on the sub-bandwidth channels, and informs a master site transceiver which sub-bandwidth communication channels are absent communication activity and therefore constitute clear channels. The master site transceiver compiles an aggregate list of clear channels from all the remote sites and then broadcasts the aggregate list to the remote sites. The master site and a remote site then conduct communications therebetween by frequency-hopping and/or orthogonal frequency multiplexing among the clear channels using an a priori known PN sequence.
70 Citations
18 Claims
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1. A method of conducting communications between respective transceivers of a communication network using a selected portion of a prescribed communication bandwidth containing a plurality of sub-bandwidth communication channels, said method comprising the steps of:
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(a) monitoring said prescribed communication bandwidth for the presence of communication activity on said sub-bandwidth communication channels, and identifying those ones of said sub-bandwidth communication channels which are absent communication activity as clear channels available for use by said respective transceivers; and (b) causing said respective transceivers to conduct communications therebetween using selected ones of said clear channels identified in step (a) and processing identifications of clear channels within a modulated filter bank containing an inverse fast Fourier transform operator and a polyphase filter, and deriving therefrom a plurality of carrier frequencies respectively corresponding to said selected ones of said clear channels; wherein said communication network contains a master site transceiver and a plurality of remote site transceivers, and wherein communications within said network are between said master site transceiver and said remote site transceivers; and wherein step (a) comprises the steps of;
(a1) causing said master site transceiver to transmit a prescribed message that is detectable by each of said remote site transceivers and, in response to said prescribed message, causing each remote site transceiver to monitor said prescribed communication bandwidth for effective communication activity on said sub-bandwidth communication channels, and to identify which of said sub-bandwidth communication channels appear to said each remote site transceiver to be absent effective communication activity and thereby constitute clear channels available for use,(a2) causing each remote site transceiver to transmit to said master site transceiver a message identifying clear channels identified thereby in step (a1), and (a3) causing said master site transceiver to broadcast to each of said remote site transceivers a communication control message containing an aggregate identification of clear channels based upon clear channel identifying messages transmitted by said remote site transceivers to said master site transceiver in step (a2). - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for conducting communications between respective sites of a communication network using a selected portion of a prescribed communication bandwidth containing a plurality of sub-bandwidth communication channels, said system comprising:
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a master site transceiver and a plurality of remote site transceivers, each remote site transceiver being operative to monitor said prescribed communication bandwidth for the presence of communication activity on said sub-bandwidth communication channels, and to inform said master site transceiver which of said sub-bandwidth communication channels are absent communication activity and therefore constitute clear channels available for use by said system;
wherein each of said master site transceiver and said remote site transceivers is operative to couple identifications of selected ones of said clear channels to a modulated filter bank containing an inverse fast Fourier transform operator and a polyphase filter so as to derive therefrom a plurality of carrier frequencies respectively corresponding to said selected ones of said clear channels;said master site transceiver being operative to compile an aggregate list of clear channels identified by said plurality of remote site transceivers and to transmit a message to said plurality of remote site transceivers containing information representative of said aggregate list of clear channels; and wherein said master site transceiver and a remote site transceiver are operative to conduct communications therebetween using said selected ones of said clear channels contained in said aggregate list. - View Dependent Claims (8, 9, 10, 11)
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12. A method of conducting communications between transceivers of a communication network, using a selected portion of a prescribed communication bandwidth containing a plurality of sub-bandwidth communication channels, said method comprising the steps of:
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(a) at a master site transceiver, transmitting a clear channel assessment message that is detectable by each of remote site transceivers; (b) at each remote site transceiver, receiving said clear channel assessment message and, in response thereto, scanning said prescribed communication bandwidth for effective communication activity on said sub-bandwidth communication channels, and identifying which of said sub-bandwidth communication channels appear to said each remote site transceiver to be absent effective communication activity and thereby constitute clear channels available for use; (c) at each remote site transceiver, transmitting a message to said master site transceiver containing information from which said clear channels may be identified at said master site transceiver and coupling identifications of selected ones of said clear channels identified to a modulated filter bank containing an inverse fast Fourier transform operator and a polyphase filter, and deriving therefrom a plurality of carrier frequencies respectively corresponding to said selected ones of said clear channels; (d) at said master site transceiver receiving messages transmitted from remote sites in step (c), compiling an aggregate list of clear channels as identified in said received messages, and transmitting to each remote site transceiver a clear channel usage message representative of said aggregate list; and (e) causing said master site and a remote site transceiver to conduct communications therebetween using said selected ones of said clear channels of said aggregate list. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification