Communication environment with plurality of radio systems
First Claim
1. A communication environment with a plurality of radio systems, a radio system of the plurality of radio systems comprising a radio station, the radio station comprising:
- checking means for checking, prior to transmission of a useful signal, whether a certain sub-frequency range in a predefined frequency range is free for a selected size of a propagation area, transmitting means for transmitting at random instants, if the certain sub-range is free, at least two pulses restricted to the certain sub-frequency range, the radio station being configured to avoid collisions with another radio system belonging to the communication environment by detecting whether the other radio system has seized the certain sub-frequency range in an overlapping radio propagation area at the same time, the other radio system, for the purpose of collision avoidance, being configured to also transmit at random instants at least two pulses, and said transmitting means transmitting, if the certain sub-frequency range is free and no collision is detected, useful signals restricted to the certain sub-frequency range.
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Accused Products
Abstract
In a communication environment with a number of radio systems a radio station in one of the radio systems seizes a sub-frequency range in a predetermined frequency range. Prior to each transmission of a useful signal, the one radio station checks whether a given sub-frequency range in the predetermined frequency range is free for a selected size of a propagation area. If the given sub-frequency range is free, the radio station transmits at random instants at least two pulses with a transmission range that is substantially restricted to the given sub-frequency range and avoids collisions with another radio system belonging to the communication environment by detecting whether the other radio system has seized the sub-frequency range in an overlapping radio propagation area at the same time. If the given sub-frequency range is free for the selected size of the radio propagation area and no collision with the other radio system is detected, the radio station transmits useful signals restricted to the given sub-frequency range.
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Citations
11 Claims
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1. A communication environment with a plurality of radio systems, a radio system of the plurality of radio systems comprising a radio station, the radio station comprising:
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checking means for checking, prior to transmission of a useful signal, whether a certain sub-frequency range in a predefined frequency range is free for a selected size of a propagation area, transmitting means for transmitting at random instants, if the certain sub-range is free, at least two pulses restricted to the certain sub-frequency range, the radio station being configured to avoid collisions with another radio system belonging to the communication environment by detecting whether the other radio system has seized the certain sub-frequency range in an overlapping radio propagation area at the same time, the other radio system, for the purpose of collision avoidance, being configured to also transmit at random instants at least two pulses, and said transmitting means transmitting, if the certain sub-frequency range is free and no collision is detected, useful signals restricted to the certain sub-frequency range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A radio station for use in a communication environment with a plurality of radio systems, the radio station comprising:
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checking means for checking, prior to each transmission of a useful signal, whether a certain sub-frequency range in a predefined frequency range is free for a selected size of a propagation area, transmitting means for transmitting at random instants, if the certain sub-frequency range is free, at least two pulses restricted to the certain sub-frequency range, the radio station being configured to avoid collisions with another radio system belonging to the communication environment by detecting whether the other radio system has seized the certain sub-frequency range in an overlapping radio propagation area at the same time, the other radio system, for the purpose of collision avoidance, being configured to also transmit at random instants at least two pulses, and said transmitting means transmitting, if the certain sub-frequency range is free and no collision is detected, useful signals restricted to the certain sub-frequency range.
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11. A method of seizing a sub-frequency range in a predefined frequency range the method comprising:
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prior to each transmission of a useful signal, checking in a radio system belonging to a communication environment whether a certain sub-frequency range in a predefined frequency range is free for a selected size of a propagation area, if the certain sub-range is free, transmitting in the radio system at random instants at least two pulses restricted to the certain sub-frequency range and avoiding in the radio system of collisions with another radio system belonging to the communication environment by detecting whether the other radio system has seized the certain sub-frequency range in an overlapping radio propagation area at the same time, also transmitting in the other radio system, for the purpose of collision avoidance, at random instants at least two pulses, and if the certain sub-frequency range is free and no collision is detected, transmitting useful signals restricted to the certain sub-frequency range.
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Specification