Forward link transmission mode for CDMA cellular communications system using steerable and distributed antennas
First Claim
1. A cellular communications system comprising:
- a mobile station;
a broadcast antenna system;
a first forward link transmission mode unit, coupled to said broadcast antenna system, for broadcasting a pilot channel used as a reference for channel estimating by said mobile station to enable decoding of a dedicated traffic channel by said mobile station;
a narrow lobe antenna system;
a second forward link transmission mode unit, coupled to said narrow lobe antenna system, for broadcasting information used by the mobile station for decoding the dedicated traffic channel without depending on the pilot channel; and
a transmission mode controller for selectively coupling data broadcasted within the dedicated traffic channel to one of said first forward link transmission mode unit and said second forward link transmission mode unit.
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Accused Products
Abstract
A DS-CDMA cellular system is provided that employs two forward link transmission modes in parallel. A conventional transmission mode broadcasts a pilot channel that can be used by a conventional mobile station to estimate and detect a dedicated traffic channel. The second transmission mode transmits (via a sectorized or narrow lobe antenna system) all information required by a new generation mobile station to estimate and detect a traffic channel dedicated to that mobile station. Consequently, DS-CDMA system operators can introduce the use of adaptive array antenna systems or distributed antenna systems with new generation mobile stations, without terminating the use of the conventional mobile stations.
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Citations
30 Claims
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1. A cellular communications system comprising:
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a mobile station; a broadcast antenna system; a first forward link transmission mode unit, coupled to said broadcast antenna system, for broadcasting a pilot channel used as a reference for channel estimating by said mobile station to enable decoding of a dedicated traffic channel by said mobile station; a narrow lobe antenna system; a second forward link transmission mode unit, coupled to said narrow lobe antenna system, for broadcasting information used by the mobile station for decoding the dedicated traffic channel without depending on the pilot channel; and a transmission mode controller for selectively coupling data broadcasted within the dedicated traffic channel to one of said first forward link transmission mode unit and said second forward link transmission mode unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A forward link transmission method for use in a cellular communications system, comprising the steps of:
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selectively coupling data broadcasted within a dedicated traffic channel to one of a first forward link transmission mode unit and a second forward link transmission mode unit; responsive to coupling the dedicated traffic channel to the first forward link transmission mode unit; broadcasting a pilot channel from a broadcast antenna system coupled to said first forward link transmission mode unit; receiving said pilot channel at a mobile station; estimating a channel phase using the received pilot channel; and decoding the dedicated traffic channel using the estimated channel phase; and responsive to coupling the dedicated traffic channel to the said second forward link transmission mode unit; broadcasting information from a narrow lobe antenna system coupled to said second forward link transmission mode unit; receiving said information at said mobile station; and decoding the dedicated traffic channel using the received information without depending on the pilot channel. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A forward link transmission system for connecting a mobile station to a cellular communications system, said forward link transmission system further comprising:
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a broadcast antenna system; a first forward link transmission mode unit, coupled to said broadcast antenna system, for broadcasting a pilot channel used as a reference for channel estimating by said mobile station to enable decoding of a dedicated traffic channel by said mobile station; a narrow lobe antenna system; a second forward link transmission mode unit, coupled to said narrow lobe antenna system, for broadcasting information used by the mobile station for decoding the dedicated traffic channel without depending on the pilot channel; and a transmission mode controller for selectively coupling data broadcasted within the dedicated traffic channel to one of said first forward link transmission mode unit and said second forward link transmission mode unit. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A forward link transmission method for use in a cellular communications system, comprising:
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selectively coupling data associated with a traffic channel to one of a first forward link transmission mode unit and a second forward link transmission mode unit; responsive to coupling the traffic channel data to the first forward link transmission mode unit, transmitting from a broadcast antenna system coupled to said first forward link transmission unit a pilot channel to be used for channel estimating by a mobile station to enable the mobile station to decode the traffic channel; and responsive to coupling the traffic channel to the second forward link transmission mode unit, transmitting from a narrow lobe antenna system coupled to said second forward link transmission unit information with which a mobile station can decode the traffic channel without depending on the pilot channel.
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30. A forward link transmission system for connecting mobile stations to a cellular communications network, comprising:
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a broadcast antenna system; a narrow lobe antenna system; a first forward link transmission mode unit having an input and an output; a second forward link transmission mode unit having an input and an output; a transmission mode controller for selectively coupling data associated with a traffic channel to one of said input of said first forward link transmission mode unit and said input of said second forward link transmission mode unit; said output of said first forward link transmission mode unit coupled to said broadcast antenna system for transmitting a pilot channel to be used for channel estimating by a mobile station to enable the mobile station to decode the traffic channel; and said output of said second forward link transmission mode unit coupled to said narrow lobe antenna system for transmitting information with which a mobile station can decode the traffic channel without depending on the pilot channel.
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Specification