Jamming-resistant wireless transmission of security data

Abstract

A jamming-resistant method and system transmit security data through a wireless telecommunication network from a first station to a second station remote from the first station. Prior to transmission, common access channels of the wireless telecommunication network are determined. The security data are then transmitted from the first station to the second station through a plurality of the common access channels of the wireless telecommunication network. The security data may be transmitted from the first station to the second station without receiving local access parameters from the wireless telecommunication network at the time of transmission.

What is claimed is:  
     
         1 . A jamming-resistant method for transmitting security data through a wireless telecommunication network from a first station to a second station remote from said first station, comprising: 
 determining, prior to transmission, common access channels of the wireless telecommunication network; and    transmitting the security data from the first station to the second station through a plurality of said common access channels of the wireless telecommunication network.    
     
     
         2 . A jamming-resistant method as defined in  claim 1 , wherein the security data are transmitted from the first station to the second station without receiving local access parameters from the wireless telecommunication network at the time of transmission.  
     
     
         3 . A jamming-resistant method as defined in  claim 1 , comprising: 
 detecting a security-breach event; and    transmitting the security data from the first station to the second station through the plurality of common access channels in response to detection of the security-breach event.    
     
     
         4 . A jamming-resistant method as defined in  claim 1 , comprising: 
 detecting the presence of a jammer proximate the first station, said jammer producing an emission interfering with transmission from the wireless telecommunication network to prevent said transmission from the network to reach the first station; and    transmitting the security data from the first station to the second station through the plurality of common access channels in response to detection of the presence of a jammer.    
     
     
         5 . A jamming-resistant method as defined in  claim 1 , wherein transmitting the security data comprises sending from the first station an autonomous registration frame to the plurality of common access channels of the wireless telecommunication network.  
     
     
         6 . A jamming-resistant method as defined in  claim 3 , wherein the wireless telecommunication network is an AMPS network, and wherein the jamming-resistant method further comprises: 
 prior to detection of a security-breach event: 
 receiving AMPS parameters from the wireless telecommunication network;  
 updating the received AMPS parameters; and  
 keeping in memory the updated AMPS parameters; and  
   after detection of a security breach event: 
 storing the last updated AMPS parameters; and  
 sending an autonomous registration frame to the wireless telecommunication network through the plurality of common access channels of the network selected in relation to the last updated AMPS parameters.  
   
     
     
         7 . A jamming-resistant method as defined in  claim 6 , further comprising: 
 determining, in relation to the last updated AMPS parameters, a first common access channel and a last common access channel defining a range of access channels including said plurality of common access channels.    
     
     
         8 . A jamming-resistant method as defined in  claim 5 , wherein transmitting the security data from the first station to the second station comprises inserting the security data in the autonomous registration frame and transmitting said autonomous registration frame to the second station through the wireless telecommunication network.  
     
     
         9 . A jamming-resistant method as defined in  claim 8 , wherein the autonomous registration frame comprises a mobile identification number, and transmitting the security data through the plurality of common access channels comprises transmitting successive sets of security data respectively inserted in successive autonomous registration frames through the plurality of common access channels using a rotation of a plurality of mobile identification numbers in the successive autonomous registration frames.  
     
     
         10 . A jamming-resistant method as defined in  claim 1 , wherein transmitting the security data through the plurality of common access channels comprises using a plurality of access channel carriers for transmitting said security data through the plurality of common access channels, respectively.  
     
     
         11 . A jamming-resistant method as defined in  claim 8 , wherein transmitting the security data through the plurality of common access channels comprises: 
 assigning at least one slave mobile identification number to the first station;    encoding information by means of said at least one slave mobile identification number; and    inserting said at least one encoded, slave mobile identification number in the autonomous registration frame.    
     
     
         12 . A jamming-resistant method as defined in  claim 8 , comprising: 
 inserting in the autonomous registration frame a station identification number corresponding to the second station, and    transmitting the autonomous registration frame to the second station through the wireless telecommunication network in response to the station identification number.    
     
     
         13 . A jamming-resistant method as defined in  claim 12 , wherein transmitting the autonomous registration frame to the second station comprises transmitting the autonomous registration frame to the second station through a Cellemetry virtual network.  
     
     
         14 . A jamming-resistant method as defined in  claim 1 , wherein transmitting the security data through the plurality of common access channels comprises sending from the first station a random access channel sequence to the wireless telecommunication network.  
     
     
         15 . A jamming-resistant method as defined in  claim 14 , wherein the wireless telecommunication network uses a plurality of fundamental frequency carriers each having first and second time slots, and wherein sending the random access channel sequence comprises sending the random access channel sequence through the first time slot of the fundamental frequency carriers.  
     
     
         16 . A jamming-resistant method as defined in  claim 15 , further comprising inserting in the random access channel sequence a random number identifying the first station.  
     
     
         17 . A jamming-resistant method as defined in  claim 15 , further comprising: 
 liberating the second time slot of the fundamental frequency carriers of the wireless telecommunication network in response to reception of the random access channel sequence; and    transmitting from the first station to the second station a second sequence including the security data through the second time slot of the fundamental frequency carriers.    
     
     
         18 . A jamming-resistant method as defined in  claim 17 , further comprising inserting in the second sequence a random number identifying the first station.  
     
     
         19 . A jamming-resistant system for transmitting security data through a wireless telecommunication network from a first station to a second station remote from said first station, wherein the wireless telecommunication network comprises common access channels, and wherein the jamming-resistant system comprises: 
 a transmitter of the security data from the first station to the second station through a plurality of said common access channels of the wireless telecommunication network.    
     
     
         20 . A jamming-resistant system as defined in  claim 19 , wherein the transmitter comprises means for transmitting the security data from the first station to the second station without receiving local access parameters from the network at the time of transmission.  
     
     
         21 . A jamming-resistant system as defined in  claim 19 , comprising a detector of a security-breach event, wherein the transmitter is responsive to said detection of the security-breach event for transmitting the security data from the first station to the second station through the plurality of common access channels.  
     
     
         22 . A jamming-resistant system as defined in  claim 19 , comprising a detector of the presence of a jammer proximate the first station, said jammer producing an emission interfering with transmission from the network to prevent said transmission from the network to reach the first station, wherein the transmitter is responsive to detection of the presence of a jammer for transmitting the security data from the first station to the second station through the plurality of common access channels.  
     
     
         23 . A jamming-resistant system as defined in  claim 19 , wherein the transmitter comprises means for sending from the first station an autonomous registration frame to the plurality of common access channels of the wireless telecommunication network.  
     
     
         24 . A jamming-resistant system as defined in  claim 21 , wherein the wireless telecommunication network is an AMPS network, and wherein the jamming-resistant system further comprises: 
 prior to detection of a security-breach event: 
 means for receiving AMPS parameters from the network;  
 means for updating the received AMPS parameters; and  
 a memory for storing the updated AMPS parameters; and  
   after detection of a security-breach event: 
 a memory for storing the last updated AMPS parameters; and  
 means for sending an autonomous registration frame to the network through the plurality of common access channels of the network selected in relation to the last updated AMPS parameters.  
   
     
     
         25 . A jamming-resistant system as defined in  claim 24 , further comprising: 
 a processor for determining, in relation to the last updated AMPS parameters, a first common access channel and a last common access channel defining a range of access channels including said plurality of common access channels.    
     
     
         26 . A jamming-resistant system as defined in  claim 23 , wherein the transmitter comprises means for inserting the security data in the autonomous registration frame and transmitting said autonomous registration frame to the second station through the wireless telecommunication network.  
     
     
         27 . A jamming-resistant system as defined in  claim 23 , wherein the autonomous registration frame comprises a mobile identification number, and the transmitter comprises means for transmitting successive sets of security data respectively inserted in successive autonomous registration frames through the plurality of common access channels using a rotation of a plurality of mobile identification numbers in the successive autonomous registration frames.  
     
     
         28 . A jamming-resistant system as defined in  claim 19 , wherein the transmitter comprises means for transmitting said security data through the plurality of common access channels using respective access channel carriers.  
     
     
         29 . A jamming-resistant method as defined in  claim 23 , wherein the transmitter comprises: 
 means for assigning at least one slave mobile identification number to the first station;    means for encoding information by means of said at least one slave mobile identification number; and    means for inserting said at least one encoded, slave mobile identification number in the autonomous registration frame.    
     
     
         30 . A jamming-resistant system as defined in  claim 26 , comprising: 
 means for inserting in the autonomous registration frame a station identification number corresponding to the second station, and    means for transmitting the autonomous registration frame to the second station through the wireless telecommunication network in response to the station identification number.    
     
     
         31 . A jamming-resistant system as defined in  claim 30 , wherein the autonomous registration frame is transmitted to the second station through a Cellemetry virtual network.  
     
     
         32 . A jamming-resistant system as defined in  claim 19 , wherein the transmitter comprises means for sending from the first station a random access channel sequence to the wireless telecommunication network.  
     
     
         33 . A jamming-resistant system as defined in  claim 32 , wherein the network uses a plurality of fundamental frequency carriers each having first and second time slots, and wherein the random access channel sequence is sent through the first time slot of the fundamental frequency carriers.  
     
     
         34 . A jamming-resistant system as defined in  claim 33 , further comprising means for inserting in the random access channel sequence a random number identifying the first station.  
     
     
         35 . A jamming-resistant method as defined in  claim 33 , further comprising: 
 means for liberating the second time slot of the fundamental frequency carriers in response to reception of the random access channel sequence; and    means for transmitting from the first station to the second station a second sequence including the security data through the second time slot of the fundamental frequency carriers.    
     
     
         36 . A jamming-resistant system as defined in  claim 35 , further comprising means for inserting in the second sequence a random number identifying the first station.