Method and apparatus for improved single cell adaption due to change in environment
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsHenrik Asplund, Mathias Riback, Bo Goransson
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Abstract
A communication method for use in a wireless communications network is proposed, said method comprising the steps of—monitoring at least one property representative of the channel variability in time and/or frequency, for each of at least two channels in the cell, used to communicate with said at least two user terminals; —using the result of the monitoring to control, by a control node in the network or in one of the user terminals, the communication in the cell. The control of the communication may include artificially inducing time selectivity and/or frequency selectivity or selecting an operating mode for the cell.
Claims27
A communication method for use in a wireless communications network comprising at least one cell in which a base station is arranged to communicate with at least one user terminal through a wireless interface, said method comprising:
- monitoring at least one property representative of the channel variability in time and/or frequency, for at least one channel in the cell used to communicate with said at least one user terminal;
- using the result of the monitoring to control, the communication in the cell;
- wherein the control of the communication in the cell includes artificially inducing time selectivity and/or frequency selectivity in the communication in said at least one channel in the cell by choosing one or more antenna weight functions for a plurality of transmit antennas;
- transmitting one or more pilot signals over the transmit antennas for use by a receiver in estimating conditions of the at least one channel, wherein a number of unique pilot signals transmitted is less than a number of transmit antennas used;
- and
- transmitting a common signal over said at least one channel using the transmit antennas, wherein the common signal is weighted in accordance with the chosen antenna weight functions.
A control unit for transmitting in a wireless telecommunications network comprising at least one cell in which a base station is arranged to communicate with at least one user terminal through a wireless interface comprising
- means for monitoring at least one property representative of the channel variability in time and/or frequency, for at least one channel in the cell used to communicate with said at least one user terminal;
- control means for controlling the communication in the cell using the result of the monitoring, wherein the control means is arranged to induce artificially time selectivity and/or frequency selectivity for the at least one channel by choosing one or more antenna weight functions for a plurality of transmit antennas;
- means for transmitting one or more pilot signals over the transmit antennas for use by a receiver in estimating conditions of the at least one channel, wherein a number of unique pilot signals transmitted is less than a number of transmit antennas used;
- and
- means for transmitting a common signal over said at least one channel using the transmit antennas, wherein the common signal is weighted in accordance with the chosen antenna weight functions.
A wireless communication network comprising:
- a base station operable to communicate with at least one user terminal through a wireless interface, the base station comprising a control unit, the control unit comprising:
- means for monitoring at least one property representative of the channel variability in time and/or frequency, for at least one channel in the cell used to communicate with said at least one user terminal;
- control means for controlling the communication in the cell using the result of the monitoring, wherein the control means is arranged to induce artificially time selectivity and/or frequency selectivity for the at least one channel;
- and
- that the control means is further arranged to artificially induce time selectivity and/or frequency selectivity in said at least one channel in the cell by choosing one or more antenna weight functions for a plurality of transmit antennas;
- means for transmitting one or more pilot signals over the transmit antennas for use by a receiver in estimating conditions of the at least one channel, wherein a number of unique pilot signals transmitted is less than a number of transmit antennas used;
- and
- means for transmitting a common signal over said at least one channel using the transmit antennas, wherein the common signal is weighted in accordance with the chosen antenna weight functions.
Dependencies are inferred from the claim text.