Wireless communications approach
DCFirst Claim
1. A method for providing communications between mobile stations, the method comprising the steps of:
- selecting a first portion of a radio frequency (RF) band to carry communications between a first mobile station and a second mobile station;
the first mobile station transmitting a first request signal on a first sub-portion of the first portion of the RF band directly to the second mobile station to request a communication session between the first mobile station and the second mobile station;
the first mobile station receiving a first acknowledge signal directly from the second mobile station on a second sub-portion of the first portion of the RF band to acknowledge the first request signal;
establishing, in response to receiving the first acknowledge signal, a direct communication session between the first mobile station and the second mobile station on the first portion of the RF band;
the first mobile station receiving from the second mobile station a public encryption key generated using a private encryption key associated with the second mobile station;
the first mobile station generating a message containing a common encryption key (Ckey);
the first mobile station encrypting the message using the public encryption key to generate an encrypted message; and
the first mobile station providing the encrypted message to the second mobile station so that the second mobile station may decrypt the encrypted message using the private encryption key and extract the Ckey;
wherein, messages exchanged between the first and second mobile stations are encrypted using the Ckey.
3 Assignments
Litigations
1 Petition
Accused Products
Abstract
An approach for providing communications between mobile stations involves establishing a direct, digital communication link between mobile stations. A first mobile station determines a portion of a radio frequency (RF) band to carry communications between the first mobile station and a second mobile station. The first mobile station sends a request signal on the portion of the RF band to the second mobile station to request communications between the first mobile station and the second mobile station. The second mobile station transmits, in response to receiving the request signal, an acknowledge signal on the portion of the RF band directly to the first mobile station to acknowledge the request signal. The first mobile station establishes, in response to the acknowledge signal, a direct communications link between the first mobile station and the second mobile station.
83 Citations
8 Claims
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1. A method for providing communications between mobile stations, the method comprising the steps of:
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selecting a first portion of a radio frequency (RF) band to carry communications between a first mobile station and a second mobile station;
the first mobile station transmitting a first request signal on a first sub-portion of the first portion of the RF band directly to the second mobile station to request a communication session between the first mobile station and the second mobile station;
the first mobile station receiving a first acknowledge signal directly from the second mobile station on a second sub-portion of the first portion of the RF band to acknowledge the first request signal;
establishing, in response to receiving the first acknowledge signal, a direct communication session between the first mobile station and the second mobile station on the first portion of the RF band;
the first mobile station receiving from the second mobile station a public encryption key generated using a private encryption key associated with the second mobile station;
the first mobile station generating a message containing a common encryption key (Ckey);
the first mobile station encrypting the message using the public encryption key to generate an encrypted message; and
the first mobile station providing the encrypted message to the second mobile station so that the second mobile station may decrypt the encrypted message using the private encryption key and extract the Ckey;
wherein, messages exchanged between the first and second mobile stations are encrypted using the Ckey. - View Dependent Claims (2, 3, 4, 5, 6)
the first mobile station transmitting a second request signal on the first sub-portion of the first portion of the RF band directly to a third mobile station to request a communication session between the first mobile station, the second mobile station and the third mobile station, the first mobile station receiving a second acknowledge signal directly from the third mobile station on the second sub-portion of the first portion of the RF band to acknowledge the second request signal, and establishing, in response to receiving the second acknowledge signal, a direct communication session between the first mobile station, the second mobile station and the third mobile station on the first portion of the RF band, the first mobile station receiving from the third mobile station a second public encryption key generated using a private encryption key associated with the third mobile station; the first mobile station encrypting the unencrypted message using the second public encryption key to generate a second encrypted message;
the first mobile station providing the second encrypted message to the third mobile station so that the third mobile station may decrypt the encrypted message using the private encryption key and extract the Ckey; and
wherein, messages exchanged between the first, second and third mobile stations are encrypted using the Ckey.
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3. The method as recited in claim 1, further comprising the steps of
selecting a second portion of the RF band to carry communications between a third mobile station and a fourth mobile station, transmitting a second request signal on a first sub-portion of the second portion of the RF band directly to the fourth mobile station to request a second communication session between the third mobile station and the fourth mobile station, receiving a second acknowledge signal on a second sub-portion of the second portion of the RF band to acknowledge the second request signal, and establishing, in response to receiving the second acknowledge signal, a direct second communication session between the third mobile station and the fourth mobile station on the second portion of the RF band. -
4. The method as recited in claim 1, further comprising the steps of communicating using a frequency division multiple access/time division multiple access communication protocol and the first portion of the RF band is a circuit.
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5. The method as recited in claim 1, wherein the step of establishing a direct communication session between the first mobile station and the second mobile station data includes
assigning a third sub-portion of the first portion of the RF band for carrying data from the first mobile station to the second mobile station, assigning a fourth sub-portion of the first portion of the RF band for carrying data from the second mobile station to the first mobile station, and transmitting a communication ready signal on the first sub-portion of the first portion of the RF band directly to the second mobile station. -
6. The method as recited in claim 1, wherein
the method further comprises the step of examining a plurality of portions of the RF band to identify a set of one or more portions that are available for use, and the step of selecting a first portion of a radio frequency (RF) band includes the first mobile station selecting a first portion from the set of one or more portions that are available for use.
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7. A wireless communication system comprising:
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a first mobile station; and
a second mobile station;
wherein the first mobile station is configured to select a first portion of a radio frequency (RF) band to carry communications between the first mobile station and the second mobile station, transmit a first request signal on a first sub-portion of the first portion of the RF band directly to the second mobile station to request communications between the first mobile station and the second mobile station, the first acknowledge signal on a second sub-portion of the first portion of the RF band directly to the first mobile station to acknowledge the first request signal.
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8. A first communications device configured to communicate securely with a second communications device by:
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generating a message containing a common encryption key (Ckey);
encrypting the message using a public encryption key associated with the second communications device to generate an encrypted message;
transmitting the encrypted message to the second communications device so that the second communications device may decrypt the encrypted message using a private encryption key used to generate the public encryption key and extract the Ckey; and
wherein, one or more other messages exchanged between the first and second communications devices are encrypted using the Ckey.
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Specification