Flexible two-way telecommunication system
First Claim
1. A method for transmitting and receiving signals between a primary station and a plurality of secondary stations in a single downlink frame, said method comprising the steps of:
- a) receiving first signals at said primary station from said secondary stations on an uplink;
b) estimating the quality of each of said received uplink signals at said primary station;
c) individually selecting modulation and coding schemes at said primary station in accordance with said estimated signals received on said uplinks for each of said secondary stations;
d) modulating second signals according to selected modulation and coding schemes for each of said secondary stations; and
e) transmitting said selectively modulated and coded second signals to each of said secondary stations on a single downlink frame, said downlink frame including a frame structure having a header for said frame and a data burst for each modulated second signal for each secondary station, said header providing information enabling each secondary station to locate its respective data burst within the frame structure.
8 Assignments
0 Petitions
Accused Products
Abstract
A flexible two-way telecommunications system is disclosed having geographically distributed primary stations whose coverage areas define contiguous cells. Secondary stations are capable of roaming between and within the coverage areas of the primary stations. Downlink communications from the primary stations use TDMA transmission and uplink transmissions from the secondary stations use CDMA/TDMA transmissions. Data packets transmitted on the downlink are modulated to suit the quality of the link between the primary station and the addressed secondary station. A header applied to the downlink transmission includes information about the location of the respective data packets relative to a reference point and the modulation scheme applied to each data packet.
101 Citations
22 Claims
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1. A method for transmitting and receiving signals between a primary station and a plurality of secondary stations in a single downlink frame, said method comprising the steps of:
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a) receiving first signals at said primary station from said secondary stations on an uplink;
b) estimating the quality of each of said received uplink signals at said primary station;
c) individually selecting modulation and coding schemes at said primary station in accordance with said estimated signals received on said uplinks for each of said secondary stations;
d) modulating second signals according to selected modulation and coding schemes for each of said secondary stations; and
e) transmitting said selectively modulated and coded second signals to each of said secondary stations on a single downlink frame, said downlink frame including a frame structure having a header for said frame and a data burst for each modulated second signal for each secondary station, said header providing information enabling each secondary station to locate its respective data burst within the frame structure. - View Dependent Claims (2, 3, 4, 5)
received signal strength indication;
bit rate;
bit error rate; and
end-to-end delay.
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3. A method as claimed in claim 1, wherein said transmitting step includes downlink transmissions that comprise time frames, where each time frame includes a header having indicia indicating the transmission characteristics and timing of each data burst in the time frame.
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4. A method as claimed in claim 1, wherein said transmitting step includes downlink transmissions that are TDMA.
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5. A method as claimed in claim 1, wherein said receiving step includes uplink transmissions that are CDMA and/or TDMA.
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6. A two-way telecommunication system including a primary station and at least one secondary station, each station capable of receiving and transmitting signals, said system comprising:
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a) means at said primary station for receiving first signals one or more secondary stations on an uplink;
b) means for estimating the quality of each of said received first signals at said primary station;
c) means for individually selecting modulation and coding schemes at said primary station in accordance with said estimated first signals received on said uplink for each of said secondary stations;
d) means for modulating second signals according to selected modulation and coding schemes for each of said secondary stations; and
e) means at said primary station for transmitting said selectively modulated and coded second signals to each of said secondary stations on a single downlink frame, said downlink frame including a frame structure having a header for said frame and a data burst for each modulated second signal for each secondary station, said header providing information enabling each secondary station to locate its respective data burst within the frame structure. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification