Method of frequency synchronization in a wireless communications system and configuration for implementing the method
First Claim
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1. A frequency-synchronizing method in a wireless communications system, which comprises:
- communicating between a mobile unit and a stationary base station over a defined number of frequencies;
transmitting a message containing a code identifying the base station during a time slot within a time frame;
deriving a key from the identification code;
specifying a defined number of different, unique frequency sequences each containing all the frequencies of the defined number of frequencies;
assigning one of the frequency sequences to the key and selecting the one frequency sequence with the key; and
consecutively changing to the frequencies contained in the assigned frequency sequence in the defined sequence by the base station and the associated mobile unit.
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Abstract
The wireless communications system synchronizes the current frequency and permits communication under the DECT protocol between a mobile unit and a fixed base station with rapid and frequent changes in frequency, as defined for example in the ADCT protocol. For this purpose a key is derived from the identification code transmitted by the base station. Lists containing random or pseudo-random frequency sequences are specified, and one of the lists is selected depending on the key transmitted, and the corresponding frequencies are used for the frequency change.
12 Citations
9 Claims
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1. A frequency-synchronizing method in a wireless communications system, which comprises:
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communicating between a mobile unit and a stationary base station over a defined number of frequencies;
transmitting a message containing a code identifying the base station during a time slot within a time frame;
deriving a key from the identification code;
specifying a defined number of different, unique frequency sequences each containing all the frequencies of the defined number of frequencies;
assigning one of the frequency sequences to the key and selecting the one frequency sequence with the key; and
consecutively changing to the frequencies contained in the assigned frequency sequence in the defined sequence by the base station and the associated mobile unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification