Systems and methods for DOCSIS profile management
A profile optimizing method is provided for a downstream channel transmission of active subcarriers to user devices. The method includes steps of receiving channel measurement data from each user device for each subcarrier, calculating a maximum bit-loading value for each user device per subcarrier, grouping the user devices into a plurality of clusters based on a proximity of the maximum bit-loading values of a first user device to those of a second user device within the particular cluster, assigning each user device within the particular cluster to a single cluster profile. A plurality of single cluster profiles for the plurality of clusters forms a set of cluster profiles. The method further includes steps of determining a channel capacity ratio for the set of cluster profiles, and combining at least two single profiles of the set of cluster profiles into a coalesced profile pair.
1. A transmission system for transmitting a plurality of active subcarriers over a channel, the plurality of active subcarriers including a first profile having a first number of carrier subgroup segments corresponding to particular modulation order, respectively, the system comprising:
a modem termination system (MTS) configured to support a second number of modulation profiles fewer than the first number;
a plurality of modems in operable communication with the modem termination system; and
a profile management unit configured to (i) identify all carrier subgroup segments in the first profile, (ii) calculate a capacity loss value for each possible pairing of a carrier subgroup segment with an immediately adjacent segment in the first profile, the immediately adjacent segment having a different modulation order than the carrier subgroup segment with which the immediately adjacent segment is paired, (iii) determine which adjacent segment pair has a minimum capacity loss among the possible carrier subgroup segment pairings in the first profile, (iv) merging the adjacent segment pair having the minimum capacity loss, (v) generating a second profile for the plurality of active subcarriers, wherein the second profile includes one fewer segment than the first profile.
2. The transmission system of claim 1 , wherein the MTS comprises the profile management unit.
3. The transmission system of claim 1 , wherein the MTS comprises at least one of a cable modem termination system, an optical network terminal, an optical line terminal, a network termination unit, and a satellite termination unit.
4. The transmission system of claim 1 , wherein the plurality of modems comprise one or more of a cable modem, an optical network unit, a digital subscriber line unit/modem, and a satellite modem.
5. The transmission system of claim 1 , wherein the second profile has a lower resolution than the first profile.
6. The transmission system of claim 1 , wherein the first and second profiles correspond to an orthogonal frequency-division multiplexing or an orthogonal frequency-division multiple access profile definition.
7. The transmission system of claim 1 , further comprising a step of recalculating, for each possible pairing of the merged adjacent segment pair with a remaining adjacent segment pair, a merged capacity loss value.
8. The transmission system of claim 7 , wherein the profile management unit is further configured to perform multiple iterations until the second profile is reduced to a target number of segments.
9. The transmission system of claim 8 , wherein the profile management unit further comprises a memory, and is further configured to store the results of each of the multiple iterations in the memory.
10. The transmission system of claim 9 , wherein the results of each of the multiple iterations are stored within a memorization list configured for sequential updating to remove stored values from segments merged in a previous iteration.