Method and apparatus for transmitting and receiving signals using two classes of channels
First Claim
1. A method for transmitting and receiving signals at a base station with an antenna array in a cellular communication system, comprising the steps of:
- dividing available communication channels into a plurality of classes;
transmitting signals to a plurality of mobile stations in a first class of channels with a wide antenna lobe created by said antenna array, wherein said first class of channels is used to transmit broadcast information to an entire cell and to receive initial access signals from mobile stations, said first class of channels is also used for enabling mobile stations to measure the downlink signal strength transmitted from adjacent base stations and is used for handover access during handovers between base stations;
determining position of a first mobile station from signals received from said first mobile station;
transmitting signals to said first mobile station in a second class of channels with a narrow antenna lobe created by said antenna array when the position of said mobile is determined; and
receiving signals from said first mobile station with adjustable lobe widths on both channel classes.
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Abstract
A method and apparatus for transmitting and receiving signals in a base station with an antenna array in a cellular communication system. The available communication channels are divided into a plurality of classes. The base station transmits signals to the mobile station in a first class of channels in a wide antenna lobe. The position of a mobile station can then be determined from signals received at the base station from the mobile station. After the position of the mobile station has been determined, the base station can transmit signals to and receive signals from the mobile station in a second class channel with a narrow antenna lobe.
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Citations
21 Claims
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1. A method for transmitting and receiving signals at a base station with an antenna array in a cellular communication system, comprising the steps of:
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dividing available communication channels into a plurality of classes; transmitting signals to a plurality of mobile stations in a first class of channels with a wide antenna lobe created by said antenna array, wherein said first class of channels is used to transmit broadcast information to an entire cell and to receive initial access signals from mobile stations, said first class of channels is also used for enabling mobile stations to measure the downlink signal strength transmitted from adjacent base stations and is used for handover access during handovers between base stations; determining position of a first mobile station from signals received from said first mobile station; transmitting signals to said first mobile station in a second class of channels with a narrow antenna lobe created by said antenna array when the position of said mobile is determined; and receiving signals from said first mobile station with adjustable lobe widths on both channel classes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A communication system with at least one base station having an antenna array, comprising;
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means for transmitting signals from a base station to a plurality of mobile stations on a plurality of classes of channels; means for receiving signals from a plurality of mobile stations at a base station on a plurality of classes of channels; means for determining a position of a mobile station from said received signals, wherein said base station transmits signals in a first class of channels with a wide antenna lobe created by said antenna array and said base station transmits signals in a second class of channels with a narrow antenna lobe created by said antenna array when the position of said mobile station has been determined, wherein said first class of channels is used to transmit broadcast information to an entire cell and to receive initial access signals from mobile stations, said first class of channels is also used for enabling mobile stations to measure the downlink signal strength transmitted from adjacent base stations and is used for handover access during handovers between base stations. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification