Adaptive splatter control
First Claim
1. A method for adaptively controlling the amount of splatter as received at a base station and caused by a mobile radio having a given set of transmission parameters including a maximum allowable deviation, a given amount of transmitter output power, and a modulation limiting bandwidth, the method comprising the steps of:
- sampling and storing a plurality of received signal strength values in the mobile radio related to an angle modulated signal received from the base station so as to derive a processed value from said plurality of stored values of received signal strength;
comparing said processed value of received signal strength from the above step against at least one predetermined threshold value established for a given set of transmission parameters; and
modifying at least one transmission parameter in the mobile radio if said processed value of received signal strength exceeds said at least one predetermined threshold value.
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Abstract
An improved arrangement and method for use in a radio communication system is disclosed which makes possible mobile radio channel assignments on narrower channel spacings with a minimum amount of adjacent channel interference or splatter occurring at an included base station receiver. In a first embodiment, the mobile radios modify at least one transmission parameter, such as maximum allowable deviation, a given amount of transmitter output power, and a modulation limiting bandwidth, if a processed value of receive signal strength exceeds at least one predetermined threshold value. The processed value of receive signal strength is taken from a plurality of sampled and stored receive signal strength values in the mobile radio. By determining that the processed value of receive signal strength exceeds a predetermined threshold value, the mobile radio is able to adaptively control the amount of splatter caused at the base station, thus keeping the amount of splatter within acceptable levels.
In a second embodiment, the improved arrangement and method incorporated in a mobile radio progressively adapts the transmission parameters upon determining that the processed value of receive signal strength exceeds a first, a second, and a third threshold value to effect reduced maximum allowable deviation only, reduce the maximum allowable deviation and power output only, or to reduce the maximum allowable deviation, power output, and modulation limiting bandwidth upon exceeding one, two, or all of these threshold values.
Moreover, in each of these embodiments, the base station includes apparatus and a method for compensating the level and bandwidth of recovered audio by sensing the relative level of received signal strength in the base station receiver.
54 Citations
51 Claims
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1. A method for adaptively controlling the amount of splatter as received at a base station and caused by a mobile radio having a given set of transmission parameters including a maximum allowable deviation, a given amount of transmitter output power, and a modulation limiting bandwidth, the method comprising the steps of:
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sampling and storing a plurality of received signal strength values in the mobile radio related to an angle modulated signal received from the base station so as to derive a processed value from said plurality of stored values of received signal strength; comparing said processed value of received signal strength from the above step against at least one predetermined threshold value established for a given set of transmission parameters; and modifying at least one transmission parameter in the mobile radio if said processed value of received signal strength exceeds said at least one predetermined threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system providing adaptive control of transmission parameters to reduce splatter as received at a base station and caused by an angle modulated transmitter in mobile radios operating on a limited number of channels, the system comprising:
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a plurality of mobile radio means having control means and each including; means for sampling and storing a plurality of received signal strength values in said mobile radio means related to an angle modulated signal from the base station so as to derive a processed value from said plurality of stored values of received signal strength; means for comparing said processed value of received signal strength against at least one predetermined threshold value established for a given set of transmission parameters; and means for modifying at least one transmission parameter in the mobile radio if said processed value of received signal strength exceeds said at least one predetermined threshold value; and base station means for communicating with said plurality of mobile radio means via the limited number of channels. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. In a trunked radio communication system having a central base station and a plurality of mobile radios utilizing angle modulated signals, an improved mobile radio comprising:
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controllably tuned transceiver means for communicating via any of a limited number of channels to the base station; control means, coupled to said controllably tuned transceiver means, for automatically controlling the operation of said transceiver means, and including; means for sampling and storing a plurality of signal strength values related to an angle modulated signal received by the mobile radio which derives a processed value from said plurality of stored values of signal strength; means for comparing said processed value of received signal strength against at least one predetermined threshold value established for a given set of transmission parameters; and means for modifying at least one transmission parameter in the mobile radio if said processed value of received signal strength exceeds said at least one predetermined threshold value. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. In a trunked radio communications system having a plurality of mobile radios and a base station utilizing angle modulated signals, an improved base station comprising:
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means for sampling and storing a plurality of signal strength values in said base station related to an angle modulated signal from a mobile radio so as to derive a processed value from said plurality of stored values of received signal strength; means for comparing said processed value of received signal strength against at least one established threshold value; and means for adjusting a level of audio gain in the base station radio upon sensing that a signal strength received from a mobile radio exceeds said at least one established threshold level. - View Dependent Claims (39)
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40. A mobile radio having adaptive splatter control, comprising in combination:
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receiving means for receiving a radio signal; transmitting means for transmitting a radio signal; means for sampling and storing a plurality of signal strength values related to a received signal from said receiving means so as to derive a processed value from said plurality of stored signal strength values; means for comparing a processed value of received signal strength against at least one predetermined threshold value; and
means for modifying at least one transmission parameter in the mobile radio if said processed value of received signal strength exceeds said at least one predetermined threshold value. - View Dependent Claims (41)
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42. A method for adaptively controlling the amount of splatter as received at a base station and caused by a mobile radio having a given set of transmission parameters, the method comprising the steps of:
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sampling received signal strength in the mobile radio related to a signal received from the base station; and modifying at least one of said transmission parameters in the mobile radio in response to said received signal strength. - View Dependent Claims (43, 44)
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45. A method for adaptively controlling the amount of splatter as received at a base station and caused by a mobile radio having a given set of transmission parameters, the method comprising the steps of:
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sampling received signal strength in the mobile radio related to a signal received from the base station so as to derive a processed value from said received signal strength; comparing said processed value of received signal strength from the above step against at least one predetermined threshold value established for a given set of transmission parameters; and modifying at least one of said transmission parameters in the mobile radio in response to said received signal strength comparison.
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46. A mobile radio havign adaptive splatter control, comprising in combination:
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receiving means for receiving a radio signal; transmitting means for transmitting a radio signal; means for sampling signal strength related to a received signal from said receiving means; and means for modifying at least one of said transmission parameters in the mobile radio in response to said received signal strength.
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47. A method for adaptively controlling the amount of splatter as received at a base station and caused by a mobile radio having a given set of transmission parameters, the method comprising the steps of:
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sampling, within the mobile radio, a received signal strength caused by a transmission from the base station; and modifying, within the mobile radio, at least two of said transmission parameters in the mobile radio in response to said received signal strength. - View Dependent Claims (48, 49)
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50. A method for adaptively controlling the amount of splatter as received at a base station and caused by a mobile radio having a given set of transmission parameters, the method comprising the steps of:
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sampling received signal strength in the mobile radio related to a signal received from the base station so as to derive a processed value from said received signal strength; comparing said processed value of received signal strength from the above step against at least one predetermined threshold value established for a given set of transmission parameters; and modifying at least two of said transmission parameters in the mobile radio in response to said received signal strength comparison.
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51. A mobile radio having adaptive splatter control, comprising in combination:
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receiving means for receiving a radio signal; transmitting means for transmitting a radio signal; means for sampling signal strength related to a received signal from said receiving means; and means for modifying at least two of said transmission parameters in the mobile radio in response to said received signal strength.
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Specification