Methods, devices and systems of supporting discontinuous operation in communication systems using vectoring
Methods, devices and techniques are disclosed where vectoring is adapted to lines becoming inactive and active, for example in a discontinued operation. In some embodiments, the vectoring is modified based on already present coefficients.
1. A device arranged to transmit data in a discontinuous operation network, the device configured to:
transmit on any of a plurality of lines symbols corresponding to the data during a transmission opportunity of a time division duplex (TDD) frame;
transmit on any one of the plurality of lines in a discontinuous operation mode quiet or idle symbols when no data is available for transmission on that one of the plurality of lines;
perform crosstalk reduction of the plurality of lines in a vectored group using a crosstalk reduction circuit; and
update precoding coefficients for crosstalk reduction based on precoding coefficients used for a previous crosstalk reduction in case of a change of composition of the vectored group in the discontinuous operation mode.
2. The device of claim 1 , comprising a crosstalk precoder to perform the crosstalk reduction by precompensating crosstalk prior to transmitting signals via the lines of the vectored group.
3. The device of claim 1 , wherein the device is configured to perform the crosstalk reduction in a case, where only a subset of the lines are active.
4. The device of claim 3 , wherein the crosstalk reduction is based on crosstalk reduction coefficients for a case where all of the lines are active.
5. The device of claim 1 , wherein the device is configured to use precoder coefficients of a disabled line to estimate an effect on crosstalk without the disabled line.
6. The device of claim 1 , wherein the device is arranged as a distribution point.
7. The device of claim 1 , wherein the device is configured to modify bits or gains during discontinuous operation based on which lines are transmitting and which are not.
8. The device of claim 1 , wherein the device is configured to transmit the quiet symbols during discontinuous operation with zero power.
9. A method to transmit data in a discontinuous operation network, the method comprising:
transmitting on any of a plurality of lines symbols corresponding to the data during a transmission opportunity of a time division duplex (TDD) frame;
transmitting on any one of the plurality of lines in a discontinuous operation mode quiet or idle symbols when no data is available for transmission on that one of the plurality of lines;
performing crosstalk reduction of the plurality of lines in a vectored group using a crosstalk reduction circuit; and
updating precoding coefficients for crosstalk reduction based on precoding coefficients used for a previous crosstalk reduction in case of a change of composition of the vectored group in the discontinuous operation mode.
10. The method of claim 9 , further comprising performing the crosstalk reduction in a case, where only a subset of the lines are active.
11. The method of claim 10 , wherein the crosstalk reduction act is based on crosstalk reduction coefficients for a case where all of the lines are active.
12. The method of claim 9 , further comprising estimating an effect on crosstalk using precoder coefficients of a disabled line.
13. The method of claim 9 , further comprising modifying bits or gains during discontinuous operation based on which lines are transmitting and which are not.
14. The method of claim 9 , further comprising transmitting the quiet or idle symbols during discontinuous operation with zero power.