Flexible two-way telecommunication system
First Claim
1. A method of transmitting a signal between a primary station and a secondary station, each said station comprising transceiving means and control means, at least the control means of the primary station being capable of determining the quality of a signal received on an uplink, characterised by modulating a signal to be transmitted on a downlink and by selecting the characteristics of the transmission in response to information concerning the quality of the uplink and/or downlink.
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Accused Products
Abstract
A flexible two-way telecommunications system comprises a plurality of geographically distributed primary stations (PS1 to PS3) whose coverage areas (CA1 to CA3) define contiguous cells. Secondary stations (SS1 to SS3) are capable of roaming between and within the coverage areas of the primary stations. Downlink communications from the primary stations comprise TDMA transmission and uplink transmissions from the secondary stations comprise 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.
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Citations
22 Claims
- 1. A method of transmitting a signal between a primary station and a secondary station, each said station comprising transceiving means and control means, at least the control means of the primary station being capable of determining the quality of a signal received on an uplink, characterised by modulating a signal to be transmitted on a downlink and by selecting the characteristics of the transmission in response to information concerning the quality of the uplink and/or downlink.
- 6. A two-way telecommunications system comprising a primary station and at least one secondary station comprising transceiving means, the primary station comprising transmitting means for transmitting signals on a downlink, receiving means for receiving signals transmitted by the transceiving means of the secondary station on an uplink and control means, said control means including means for determining the quality of a signal received by the receiving means from the uplink and means for modulating a signal to be transmitted on the downlink, said modulating means selecting the characteristics of the uplink and/or downlink transmission in response to information obtained concerning the quality of the uplink and/or downlink.
Specification