Scrambling identifiers for wireless communication systems

A method of assigning scrambling identifiers, the method comprising:

• selecting a number of user equipments to include in a group based on one or more of a number of user equipments in a system, a number of transmission layers, or a number of supported orthogonal ports for demodulation reference signals;
• dividing a plurality of user equipments in groups, wherein the groups comprise the group and a second group;
• assigning, by a baseband unit, a first scrambling identifier to each user equipment of the group, such that the first scrambling identifier is the same for each of the user equipments of the group;
• and
• assigning, by the baseband unit, a second scrambling identifier to each of the user equipments of the group, such that the second scrambling identifier is different for each of the user equipments of the group.

A network system comprising:

• a baseband unit comprising at least one processor and storing instructions, wherein the instructions, when executed by the at least one processor, cause the baseband unit to:
• assign a first scrambling identifier to each user equipment of a plurality of groups of user equipments and a second scrambling identifier to each of the user equipments of the plurality of groups, such that (i) the first scrambling identifier is the same for each of the user equipments of a first group of the plurality of groups, (ii) the second scrambling identifier is different for each of the user equipments of the first group, (iii) the first scrambling identifier is the same for each of the user equipments of a second group of the plurality of groups (iv) the second scrambling identifier is different for each of the user equipments of the second group, and (v) the first scrambling identifier for each of the user equipments of the second group is different than the first scrambling identifier for each of the user equipments of the first group, wherein the user equipments of the first group are co-scheduled with user equipments of the second group;
• select one of the first scrambling identifier or the second scrambling identifier as a selected identifier for a particular user equipment of the first group;
• and
• generate a demodulation reference signal sequence based on the selected identifier;
• and
• one or more radio units in communication with the baseband unit, the one or more radio units configured to wirelessly transmit a demodulation reference signal to the particular user equipment of the first group, the demodulation reference signal being associated with the demodulation reference signal sequence.

A baseband system comprising:

• a centralized unit comprising circuitry programmed to:
• assign a first scrambling identifier to each user equipment of a group of user equipments and a second scrambling identifier to each of the user equipments of the group, such that (i) the first scrambling identifier is the same for each of the user equipments of the group and (ii) the second scrambling identifier is different for each of the user equipments of the group;
• and
• assign a first scrambling identifier to each user equipment of a second group of user equipments and a second scrambling identifier to each of the user equipments of the second group, such that (i) the first scrambling identifier is the same for each of the user equipments of the second group, (ii) the second scrambling identifier is different for each of the user equipments of the second group, and (iii) the first scrambling identifier for each of the user equipments of the second group is different than the first scrambling identifier for each of the user equipments of the group;
• and
• a distributed unit in communication with the centralized unit, the distributed unit comprising circuitry programmed to select a particular scrambling identifier for each of the user equipments of the group,
• wherein the user equipments of the group are co-scheduled with user equipments of the second group.