Demodulation reference signal based modulation and coding scheme determination in downlink allocation

A method, comprising:

• transmitting, by a first device comprising a processor, a first transmission to a second device via a downlink channel using downlink resource blocks scheduled for the first transmission, wherein the first transmission utilizes a first modulation and coding scheme (MCS) and comprises a demodulation reference signal (DMRS), and wherein the downlink resource blocks comprise less than a full bandwidth part associated with the second device;
• receiving, by the first device, a second transmission from the second device in response to the transmitting of the first transmission, wherein the second transmission comprises first channel quality data, indicative of a first channel quality of the downlink channel as estimated by the second device over the downlink resource blocks based on the DMRS, and a hybrid automatic repeat request (HARQ) data corresponding to the first transmission;
• adjusting, by the first device, the first MCS based on the channel quality data, resulting in a second MCS to be applied to a third transmission to the second device;
• transmitting, by the first device, a fourth transmission to the second device, the fourth transmission comprising a channel state information reference signal (CSI-RS) and occupying the full bandwidth part associated with the second device;
• and
• receiving, by the first device, a fifth transmission from the second device in response to the transmitting of the fourth transmission, wherein the fifth transmission comprises second channel condition data, indicative of a second condition of the downlink channel as estimated by the second device over the full bandwidth part associated with the second device based on the CSI-RS.

A non-transitory machine-readable medium comprising computer executable instructions that, when executed by a processor of a Node B, facilitate performance of operations, the operations comprising:

• transmitting a first message to a mobile device via a physical downlink shared channel using a first modulation and coding scheme (MCS) and downlink resource blocks scheduled for the first message, the first message comprising a demodulation reference signal (DMRS), wherein the downlink resource blocks comprise less than a full bandwidth part associated with the mobile device;
• receiving a second message from the mobile device via an uplink communication channel in response to the first message, wherein the second message comprises first channel condition data, associated with a first condition of the physical downlink shared channel as observed by the mobile device over the downlink resource blocks based on the DMRS, and an acknowledgement (ACK)/negative acknowledgement (NACK) indicator corresponding to the first message;
• determining a second MCS to be applied to a third message to be transmitted to the mobile device by modifying the first MCS based on the channel condition data;
• transmitting a fourth message to the mobile device, the fourth transmission comprising a channel state information reference signal (CSI-RS) and occupying the full bandwidth part associated with the mobile device;
• and
• receiving a fifth message from the mobile device in response to the fourth message, wherein the fifth message comprises second channel condition data, indicative of a second condition of the physical downlink shared channel as observed by the mobile device over the full bandwidth part associated with the mobile device based on the CSI-RS.