Multiple access handling in a cellular communications system
First Claim
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1. A method of operating a cellular system, wherein a mobile station transmits a mobile generated transmission which is received by at least two base stations, said method comprising the steps of:
- measuring the signal strength of the received mobile generated transmission;
sending the mobile generated transmission and the measured signal strength of the mobile generated transmission to a processing means from the at least two base stations;
storing in a memory the respective mobile generated transmissions and measured signal strengths received from the at least two base stations within a predetermined time period; and
determining which of the mobile generated transmissions to accept based on time of receipt by the processing means and the stored signal strengths of the mobile generated transmissions, wherein the step of determining comprises the steps of;
comparing signal strengths to yield a difference value;
if the difference value is greater than or equal to a predetermined threshold, accepting the mobile generated transmission having the strongest relative signal strength; and
if the difference value is below the predetermined threshold, accepting one of the received mobile generated transmissions according to a predetermined priority order.
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Abstract
A method and apparatus for use in a cellular mobile radio telephone system for determining which of one of several mobile generated transmissions received in a mobile switching center, sent from the same mobile station via more than one base station, should be accepted. A determination is made based on the relative signal strengths of the signals received by the base stations and by the relative time of occurrence of the mobile generated transmissions.
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Citations
28 Claims
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1. A method of operating a cellular system, wherein a mobile station transmits a mobile generated transmission which is received by at least two base stations, said method comprising the steps of:
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measuring the signal strength of the received mobile generated transmission; sending the mobile generated transmission and the measured signal strength of the mobile generated transmission to a processing means from the at least two base stations; storing in a memory the respective mobile generated transmissions and measured signal strengths received from the at least two base stations within a predetermined time period; and determining which of the mobile generated transmissions to accept based on time of receipt by the processing means and the stored signal strengths of the mobile generated transmissions, wherein the step of determining comprises the steps of; comparing signal strengths to yield a difference value; if the difference value is greater than or equal to a predetermined threshold, accepting the mobile generated transmission having the strongest relative signal strength; and if the difference value is below the predetermined threshold, accepting one of the received mobile generated transmissions according to a predetermined priority order. - View Dependent Claims (2, 3, 4)
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5. A method
of operating a cellular system, wherein a mobile station transmits a mobile generated transmission which is received by at least two base stations, said method comprising the steps of: -
measuring the signal strength of the received mobile generated transmission; sending the mobile generated transmission and the measured signal strength of the mobile generated transmission to a processing means from the at least two base stations; processing a first received mobile generated transmission from one of the at least two base stations, the processing comprising the steps of; storing in a memory the respective mobile generated transmissions and measured signal strengths received from the at least two base stations within a predetermined time period, wherein the step of storing comprises storing the received mobile generated transmission and the identity of the mobile station, the signal strength, and the time of receipt of the mobile generated transmission by the processing means; and determining which of the mobile generated transmissions to accept based on time of receipt by the processing means and the stored signal strengths of the mobile generated transmissions, wherein the step of determining comprises the steps of; comparing the signal strength of a subsequent mobile generated transmission received from a second one of the at least two base stations within the predetermined time period with the stored transmission signal strength and determining a difference value; if the difference value is greater than or equal to a predetermined threshold and the signal strength of the subsequent transmission is greater than the stored signal strength, then terminating the processing of the processed mobile generated transmission, and storing the identity of the mobile station, signal strength, and time of receipt of the subsequent mobile generated transmission. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method of operating a cellular system, wherein a mobile station transmits a mobile generated transmission which is received by at least two base stations, said method comprising the steps of:
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processing the mobile generated transmission received first from one of the base stations; storing the identification of the base station from which the processed mobile generated transmission originated and the signal strength of the processed mobile generated transmission; comparing the signal strength of a subsequent mobile generated transmission received from another base station to the signal strength of the processed mobile generated transmission to yield a difference value; obtaining a compensated difference value by adding, to the difference value, a compensation value stored relative to the base stations from which the processed mobile generated transmission and the subsequent mobile generated transmission are received; when the compensated difference value is greater than or equal to a predetermined threshold amount, terminating the processed mobile generated transmission, processing the subsequent mobile generated transmission having the greater signal strength, and storing the identification of the base station from which the subsequent processed mobile generated transmission originated and the signal strength of the subsequent processed mobile generated transmission; and repeating the comparing, terminating and subsequent processing and storing steps for further mobile generated transmissions received during a set time period. - View Dependent Claims (12)
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13. A method for use in a cellular radio telephone system for determining which mobile generated transmission, received by a processing means from at least two base stations receiving a single mobile generated transmission, should be accepted by the processing means, the method comprising the steps of:
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(a) in the mobile station; (1) scanning a plurality of control channels over which messages are broadcast by a plurality of base stations to determine relative signal strengths of the messages; (2) sending a mobile generated transmission over a selected one of said plurality of control channels, the mobile generated transmission being received by the at least two base stations; (b) in the at least two base stations; (1) measuring the signal strength of the received mobile generated transmission; (2) sending the mobile generated transmission and the measured signal strength of the received mobile generated transmission to the processing means; (c) in the processing method; (1) storing in a memory the respective mobile generated transmissions and measured signal strengths received from the at least two base stations within a predetermined period of time; and (2) determining which of the received mobile generated transmissions to accept based on the time of receipt in the processing means and the relative signal strengths of the mobile generated transmissions, and wherein the step of determining comprises the steps of; comparing the signal strengths of the stored transmissions to yield a difference value; if the difference value is greater than or equal to a predetermined threshold, accepting the mobile generated transmission having the highest relative signal strength; and if the difference value is below the predetermined threshold, accepting one of the received mobile generated transmissions according to a predetermined priority order. - View Dependent Claims (14, 15, 16, 17)
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18. A method for use in a cellular radio telephone system for determining which mobile generated transmission, received by a processing means from at least two base stations receiving a single mobile generated transmission, should be accepted by the processing means, the method comprising the steps of:
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(a) in the mobile station; (1) scanning a plurality of control channels over which messages are broadcast by a plurality of base stations to determine relative signal strengths of the messages; (2) sending a mobile generated transmission over a selected one of said plurality of control channels, the mobile generated transmission being received by the at least two base stations; (b) in the at least two base stations; (1) measuring the signal strength of the received mobile generated transmission; (2) sending the mobile generated transmission and the measured signal strength of the received mobile generated transmission to the processing means; (c) in the processing means; (1) processing a first received mobile generated transmission from one of the at least two base stations, the processing comprising the steps of; (i) storing in a memory the respective mobile generated transmission and measured signal strengths received from the at least two base stations within the predetermined period of time, the step of storing comprising storing the received mobile generated transmission and the identity of the mobile station, the signal strength, and the time of receipt of the mobile generated transmission by the processing means; and (ii) determining which of the received mobile generated transmissions to accept based on the time of receipt in the processing means and the relative signal strengths of the mobile generated transmissions; wherein the step of determining comprises the steps of; comparing the signal strength of a subsequent mobile generated transmission received from a second one of the at least two base stations within the predetermined time period with the stored transmission signal strength and determining a difference value; if the difference value is greater than or equal to a predetermined threshold and the signal strength of the subsequent transmission is greater than the stored signal strength, then terminating the processing of the processed mobile generated transmission, and storing the identity of the mobile station, signal strength, and time of receipt of the subsequent mobile generated transmission. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. A method for use in a cellular radio telephone system for determining which mobile generated transmission, received by processing means from at least two base stations receiving a single mobile generated transmission, should be accepted by the processing means, said method comprising the steps of:
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(a) in the mobile station; (1) scanning a plurality of control channels over which messages are broadcast by a plurality of base stations to determine relative signal strengths of the messages; (2) sending a mobile generated transmission over a selected one of said plurality of control channels, said mobile generated transmission being received by the at least two base stations; (b) in the at least two base stations; (1) measuring the signal strength of the received mobile generated transmission; (2) sending the mobile generated transmission and the measured signal strength of the received mobile generated transmission to the processing means; (c) in the processing means; (1) authorizing the at least two base stations from which mobile generated transmissions are received initiated by the same mobile station within a predetermined time interval to assign a voice channel to the mobile station; (d) in the at least two base stations; (1) assigning a voice channel to the mobile station and transmitting a verification signal to the mobile station; (2) receiving a signal from the mobile station on the assigned voice channel, the signal comprising a verification signal; (3) if the verification signal on the assigned voice channel is the same as that transmitted to the mobile station, measuring the signal strength of the signal received from the mobile station on the assigned voice channel and transmitting the signal and the signal strength thereof to the processing means; (e) in the processing means; (1) adding a compensation value to the signal strength of the received signals, based on which two of the at least two base stations have transmitted; and (2) accepting the mobile generated transmission from the base station whose signal on the voice channel has the strongest or second strongest compensated signal strength.
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27. A system for processing multiple mobile generated transmissions in a cellular system, said cellular system having at least one mobile unit, at least two base stations and at least one processing means, said system comprising:
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means, provided in said mobile unit, for scanning signals transmitted by such base stations on at least one base to mobile control channel and selecting one of said base stations for access; means, provided in said mobile unit, for transmitting said mobile generated transmissions over a control channel of the selected base station; means, provided in said at least two base stations, for receiving said transmitted mobile generated transmission and for sending said received mobile generated transmissions to said processing means; and means, provided in said processing means, for selecting one of several mobile generated transmissions received from at least two base stations for processing based on the time of receipt of the mobile generated transmission and the relative signal strength of the mobile to base signal associated with the mobile generated transmissions, said means comprising; memory means for storing the mobile generated transmissions which occur within a predetermined time period, identities of the mobile stations sending the mobile generated transmissions, signal strength of the mobile generated transmissions measured at the time of receipt of the mobile generated transmission by the respective base stations; means for measuring the signal strengths of the mobile generated transmissions; first comparing means for comparing the stored signal strengths of the transmissions to yield a difference value; second comparing means for comparing the difference value to a predetermined threshold; wherein said means for selecting is responsive to said second comparing means to select a mobile generated transmission having the strongest relative signal strength when the difference value is greater than or equal to the predetermined threshold and accept another one of the received mobile generated transmissions according to a predetermined priority order when the difference value is below the predetermined threshold. - View Dependent Claims (28)
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Specification