LINE GROUPING FOR CROSSTALK AVOIDANCE
According to embodiments, crosstalk avoidance in a data transmission system is based on separating lines of the data transmission system at least into a first group, a second group, and a third group. Transmissions on lines of the first group are controlled to occur at different times than transmissions on lines of the second group. Transmissions on lines of the third group are allowed to occur at the same time with transmissions on the lines of the first group or with transmissions on the lines of the second group.
1 - 23 . (canceled)
24 . A method for crosstalk avoidance in a data transmission system, the method comprising:
separating lines of the data transmission system at least into a first group, a second group, and a third group;
controlling transmissions on lines of the first group to occur at different times than transmissions on lines of the second group;
controlling transmissions on lines of the third group to occur at the same time with transmissions on the lines of the first group; and
controlling transmissions on the lines of the third group to occur at the same time with transmissions on the lines of the second group.
25 . The method according to claim 24 , comprising:
configuring at least a first time interval and a second time interval which does not overlap the first time interval;
assigning transmissions on the lines of the first group to the first time interval;
assigning transmissions on the lines of the second group to the second time interval;
assigning transmissions on the lines of the third group to the first time interval; and
assigning transmissions on the lines of the third group to the second time interval.
26 . The method according to claim 25 , comprising:
discontinuing the lines of the first group in the second time interval; and
discontinuing the lines of the second group in the first time interval.
27 . The method according to claim 26 , comprising:
controlling a transmitter and crosstalk cancelation coefficients of a discontinued line for enhancing received signal power of one or more lines of the third group.
28 . The method according to claim 24 , comprising:
for each of the lines, determining a line length; and
according to the determined line lengths, separating the lines into the first group, the second group, and the third group.
29 . The method according to claim 28 , comprising:
estimating the line length during a startup sequence for joining the line to the data transmission system; and
depending on the estimated line length, assign the line to the first group, the second group, or the third group.
30 . The method according to claim 28 ,
wherein the lines of the third group have longer line lengths than the lines of the first group and the lines of the second group.
31 . The method according to claim 24 , comprising:
assigning frequencies to at least some lines of the first group and/or of the second group which are different from frequencies assigned to the lines of the third group.
32 . The method according to claim 30 , comprising:
assigning frequencies to at least some lines of the first group and/or of the second group which are higher than frequencies assigned to the lines of the third group.
33 . The method according to claim 24 , comprising:
configuring a first crosstalk cancelation group comprising the lines of the first group and the lines of the third group;
configuring a second crosstalk cancelation group comprising the lines of the second group and the lines of the third group;
wherein crosstalk cancelation is limited to consideration of lines of the same crosstalk cancelation group.
34 . The method according to claim 33 , comprising:
in crosstalk cancelation, ignoring mutual crosstalk couplings for some lines of the first group and/or for some lines of the second group.
35 . The method according to claim 24 , comprising:
separating the lines into the first group, the second group, the third group, and a fourth group, wherein the lines of the fourth group are not subject to crosstalk cancelation.
36 . The method according to claim 35 , comprising:
for each of the lines, estimating a crosstalk strength indicator; and
depending on the crosstalk strength indicator, assigning some of the lines to the fourth group.
37 . The method according to claim 24 , comprising:
constructing codes for channel estimation which are the same for the lines of the first group and the lines of the second group.
38 . The method according to claim 24 ,
wherein the data transmission system is based on a Vectoring Digital Subscriber Line technology.
39 . A device for a data transmission system, the device comprising at least one processor configured to:
separate lines of the data transmission system at least into a first group, a second group, and a third group;
control transmissions on lines of the first group to occur at different times than transmissions on lines of the second group;
control transmissions on lines of the third group to occur at the same time with transmissions on the lines of the first group; and
control transmissions on the lines of the third group to occur at the same time with transmissions on the lines of the second group.
40 . The device according to claim 39 , wherein the at least one processor is configured to:
for each of the lines, determine a line length; and
according to the determined line lengths, separate the lines into the first group, the second group, and the third group.
41 . The device according to claim 39 , wherein the at least one processor is configured to:
estimate the line length during a startup sequence for joining the line to the data transmission system; and
depending on the estimated line length, assign the line to the first group, the second group, or the third group.
42 . The device according to claim 39 ,
wherein the lines of the third group have longer line lengths than the lines of the first group and the lines of the second group.
43 . The device according to claim 42 , wherein the at least one processor is configured to:
assign frequencies to at least some lines of the first group and/or of the second group which are higher than frequencies assigned to the lines of the third group.
44 . A data transmission system, comprising:
a plurality of lines; and
at least one device configured to:
separate lines of the data transmission system at least into a first group, a second group, and a third group;
control transmissions on lines of the first group to occur at different times than transmissions on lines of the second group;
control transmissions on lines of the third group to occur at the same time with transmissions on the lines of the first group; and
control transmissions on the lines of the third group to occur at the same time with transmissions on the lines of the second group.
45 . The data transmission system according to claim 44 ,
wherein the at least one device is a distribution point of a fibre to the curb or fibre to the building system based on a Vectoring Digital Subscriber Line technology.
46 . The data transmission system according to claim 44 ,
wherein the at least one device is a processor of a distribution point of a fibre to the curb or fibre to the building system based on a Vectoring Digital Subscriber Line technology.
47 . The device according to claim 39 ,
wherein the device is a processor of a distribution point of a fiber to the curb or fiber to building system based on a Vectoring Digital Subscriber Line technology.