DMRS with Shortened Scheduling

A method in a wireless device of a wireless communication network, the wireless device operable to receive radio transmissions scheduled separately per sub-subframe (SSF), the method comprising:

• receiving a first demodulation reference signal (DMRS) mapped to one or more first resource elements in a first SSF, the one or more first resource elements associated with a first set of one or more antenna ports;
• receiving a radio transmission precoded in accordance with the first DMRS;
• and
• wherein a subframe comprises the first SSF and a second SSF, the second SSF comprises a DMRS mapped to one or more second resource elements in the second SSF, the one or more second resource elements associated with the first set of one or more antenna ports.

A network node operable to separately schedule radio transmissions per sub-subframe (SSF), the network node comprising a processor operable to:

• map a first demodulation reference signal (DMRS) to one or more first resource elements in a first SSF, the one or more first resource elements associated with a first set of one or more antenna ports;
• map a second DMRS to one or more second resource elements in a second SSF, the one or more second resource elements associated with the first set of one or more antenna ports, and a precoding of the second DMRS differs from a precoding of the first DMRS;
• schedule a first radio transmission during the first SSF precoded in accordance with the first DMRS;
• schedule a second radio transmission during the second SSF precoded in accordance with the second DMRS;
• and
• transmit the scheduled first and second radio transmissions.

A wireless device operable to receive radio transmissions scheduled separately per sub-subframe (SSF), the wireless device comprising a processor operable to:

• receive a first demodulation reference signal (DMRS) mapped to one or more first resource elements in a first SSF, the one or more first resource elements associated with a first set of one or more antenna ports;
• and
• receive a radio transmission precoded in accordance with the first DMRS;
• and
• wherein a subframe comprises the first SSF and a second SSF, the second SSF comprises a DMRS mapped to one or more second resource elements in the second SSF, the one or more second resource elements associated with the first set of one or more antenna ports.