Method for transmitting an encryoption number in a communication system and a communication system
First Claim
1. A method for transmitting an encryption number in a communication system (1) comprising mobile terminals (MT1-MT4) and at least a first access point (AP1) and a second access point (AP2), the method comprising the steps of:
- defining a set of encryption keys, selecting at each said access point (AP1, AP2) from said set of encryption keys one to be used at a time for encrypting information to be transmitted between said access point (AP1, AP2) and mobile terminal (MT1-MT4), transmitting from the access point (AP1, AP2), at intervals, data about the encryption key selected at the time, setting up a data transmission connection between a mobile terminal (MT1-MT4) and the first access point (AP1) for the transmission of information, and performing a handover, whereby a data transmission connection is set up between the second access point (AP2) and the mobile terminal (MT1-MT4), characterized in that in the method, in connection with the handover, information is transmitted to the mobile terminal (MT1-MT4) about the encryption key selected at the second access point (AP2).
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Abstract
The invention relates to a method for transmitting an encryption number in a communication system (1) comprising mobile terminals (MT1-MT4) and at least a first access point (AP1) and a second access point (AP2). The method comprises the steps of defining a set of encryption keys, selecting at each said access point (AP1, AP2) from said set of encryption keys one to be used at a time for encrypting information to be transmitted between said access point (AP1, AP2) and mobile terminal (MT1-MT4), transmitting from the access point (AP1, AP2), at intervals, data about the encryption key selected at the time, setting up a data transmission connection between a mobile terminal (MT1-MT4) and the first access point (AP1) for the transmission of information, and performing a handover, whereby a data transmission connection is set up between the second access point (AP2) and the mobile terminal (MT1-MT4). In the method, a handover is performed, wherein a data transmission connection is set up between the second access point (AP2) and the mobile terminal (MT1-MT4). In the method, in connection with the handover, information is also transmitted to the mobile terminal (MT1-MT4) about the encryption key selected at the second access point (AP2).
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Citations
15 Claims
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1. A method for transmitting an encryption number in a communication system (1) comprising mobile terminals (MT1-MT4) and at least a first access point (AP1) and a second access point (AP2), the method comprising the steps of:
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defining a set of encryption keys, selecting at each said access point (AP1, AP2) from said set of encryption keys one to be used at a time for encrypting information to be transmitted between said access point (AP1, AP2) and mobile terminal (MT1-MT4), transmitting from the access point (AP1, AP2), at intervals, data about the encryption key selected at the time, setting up a data transmission connection between a mobile terminal (MT1-MT4) and the first access point (AP1) for the transmission of information, and performing a handover, whereby a data transmission connection is set up between the second access point (AP2) and the mobile terminal (MT1-MT4), characterized in that in the method, in connection with the handover, information is transmitted to the mobile terminal (MT1-MT4) about the encryption key selected at the second access point (AP2). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A mobile communication system (1) comprising mobile terminals (MT1-MT4), at least a first access point (AP1) and a second access point (AP2);
- a set of encryption keys being defined in the communication system (1);
the access point (AP1, AP2) comprising means for selected from said set of encryption keys one at a time to be used for encryption of information to be transmitted between said access point (AP1, AP2) and mobile terminal (MT1-MT4), and means for transmitting information about the encryption key selected at the time at intervals from the access point (AP1, AP2);
the communication system (1) also comprising means for setting up a data transmission connection between the mobile terminal (MT1-MT4) and the first access point (AP1) for the transmission of information, and means for executing a handover and setting up a data transmission connection between the second access point (AP2) and the mobile terminal (MT1-MT4), characterized in that the mobile communication system (1) also comprises means for transmitting information about the encryption key selected at the second access point (AP2) to the mobile terminal (MT1-MT4) in connection with the handover. - View Dependent Claims (10, 11, 12, 13, 14, 15)
- a set of encryption keys being defined in the communication system (1);
Specification