US-12627443-B2 - Demodulation reference signal based modulation and coding scheme determination in downlink allocation

Abstract

Demodulation reference signal (DMRS) based modulation and coding scheme (MCS) determination in downlink allocation is described herein. A method as described herein can include transmitting, by a first device comprising a processor, a first transmission to a second device via a downlink channel, wherein the first transmission utilizes a first MCS and comprises a DMRS; 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 channel quality data, indicative of a channel quality of the downlink channel as estimated by the second device based on the DMRS, and a hybrid automatic repeat request (HARQ) data corresponding to the first transmission; and 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.

Inventors

• Eran Goldstein
• Ilya Portnik
• Jayaram Venguduswamy Srinivasan

Assignees

• DELL PRODUCTS L.P.

Dates

Publication Date

20260512

Application Date

20230317

Claims (20)

1. 1 . Network equipment, comprising: a memory that stores executable components; and a processor that executes the executable components stored in the memory, wherein the executable components comprise: a transmitter component that conducts a first transmission to a user equipment (UE) via a downlink communication channel using a first modulation and coding scheme (MCS) and downlink resource blocks scheduled for the first transmission, the first transmission comprising a demodulation reference signal (DMRS), wherein the downlink resource blocks comprise less than a full bandwidth part associated with the UE; a receiver component that receives a second transmission from the UE via an uplink communication channel in response to the first transmission, the second transmission comprising first channel condition data, indicative of a first condition of the downlink communication channel as observed by the UE over the downlink resource blocks based on the DMRS, and a hybrid automatic repeat request (HARQ) indicator corresponding to the first transmission; and a parameter adjustment component that determines a second MCS to be applied to a third transmission to the UE by modifying the first MCS based on the channel condition data, wherein the transmitter component further conducts a fourth transmission to the UE, the fourth transmission comprising a channel state information reference signal (CSI-RS) and occupying the full bandwidth part associated with the UE, and wherein the receiver component further receives a fifth transmission from the UE, the fifth transmission comprising second channel condition data, indicative of a second condition of the downlink communication channel as observed by the UE over the full bandwidth part associated with the UE based on the CSI-RS.
2. 2 . The network equipment of claim 1 , wherein the executable components further comprise: a configuration component that transmits, prior to the first transmission, an instruction to the UE to provide the channel condition data with the HARQ indicator, wherein the receiver component receives the second transmission in further response to the instruction.
3. 3 . The network equipment of claim 2 , wherein the configuration component receives, from the UE, an indication of a capability of the UE to determine the channel condition data based on the DMRS, and wherein the configuration component transmits the instruction in response to receiving the indication.
4. 4 . The network equipment of claim 2 , wherein the instruction comprises a reporting frequency, and wherein the instruction causes the UE to provide the channel condition data based on DMRSs, comprising the DMRS, as provided in first transmissions, comprising the first transmission and selected from transmissions to the UE according to the reporting frequency.
5. 5 . The network equipment of claim 1 , wherein the transmitter component conducts the first transmission based on a first channel condition metric associated with the downlink communication channel, and wherein the executable components further comprise: a channel evaluation component that compares the first channel condition metric to a second channel condition metric that is based on the channel condition data received via the receiver component, wherein the parameter adjustment component determines the second MCS in response to a deviation between the first channel condition metric and the second channel condition metric being at least a first threshold amount.
6. 6 . The network equipment of claim 5 , wherein the transmitter component conducts the first transmission using first time-frequency resources, and wherein the executable components further comprise: a scheduling component that, in response to the deviation between the first channel condition metric and the second channel condition metric being at least a second threshold amount that is greater than the first threshold amount, assigns the third transmission to second time-frequency resources that are not the first time-frequency resources.
7. 7 . The network equipment of claim 1 , wherein the HARQ indicator is an acknowledgement, and wherein the third transmission is distinct from the first transmission.
8. 8 . The network equipment of claim 1 , wherein the HARQ indicator is a negative acknowledgement, and wherein the third transmission is a re-transmission of the first transmission.
9. 9 . The network equipment of claim 4 , wherein the instruction causes the UE to provide the channel condition data based on each N-th DMRS of the DMRSs as provided in the first transmissions, and wherein N is a number greater than zero and defined based on the reporting frequency.
10. 10 . The network equipment of claim 1 , wherein: the transmitter component conducts fourth transmissions, comprising the fourth transmission, to the UE at intervals of a period; and the receiver component receives second transmissions, comprising the second transmission, in response to first transmissions, comprising the first transmission, in which the CSI-RS is not present.
11. 11 . 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.
12. 12 . The method of claim 11 , further comprising: transmitting, prior to the transmitting of the first transmission, an instruction message to the second device to provide the channel quality data with the HARQ data, wherein the receiving of the second transmission is in further response to the transmitting of the instruction message.
13. 13 . The method of claim 12 , wherein the instruction message indicates a reporting frequency, and wherein the instruction message causes the second device to provide the channel quality data based on DMRSs, comprising the DMRS, as provided in first transmissions, comprising the first transmission and selected from transmissions to the second device according to the reporting frequency.
14. 14 . The method of claim 11 , wherein the transmitting of the first transmission is based on a first channel quality associated with the downlink channel, and wherein the method further comprises: comparing, by the first device, the first channel quality to a second channel quality that is based on the channel quality data received from the second device; and determining, by the first device, the second MCS in response to a difference between the first channel quality and the second channel quality being at least a first threshold amount.
15. 15 . The method of claim 14 , wherein the first transmission is assigned to first time-frequency resources, and wherein the method further comprises: assigning, by the first device in response to the difference between the first channel quality and the second channel quality being at least a second threshold amount that is greater than the first threshold amount, the third transmission to second time-frequency resources that are not the first time-frequency resources.
16. 16 . The method of claim 11 , wherein the HARQ data comprises an acknowledgement, and wherein the third transmission is distinct from the first transmission.
17. 17 . The method of claim 11 , wherein the HARQ data comprises a negative acknowledgement, and wherein the third transmission is a re-transmission of the first transmission.
18. 18 . 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.
19. 19 . The non-transitory machine-readable medium of claim 18 , wherein the operations further comprise: transmitting, prior to a time at which the first message is transmitted, an instruction to the mobile device, the instruction directing the mobile device to provide the channel condition data with the ACK/NACK indicator, wherein the receiving of the second message is in further response to the instruction.
20. 20 . The non-transitory machine-readable medium of claim 18 , wherein the first message is transmitted via first time-frequency resources and based on a first channel quality associated with the physical downlink shared channel, and wherein the operations further comprise: comparing the first channel quality to a second channel quality that is based on the channel condition data received from the mobile device; determining, in response to a deviation between the first channel quality and the second channel quality being at least a first threshold amount, the second MCS; and assigning, in response to the deviation being at least a second threshold amount that is larger than the first threshold amount, the third message to second time-frequency resources that are not the first time-frequency resources.

Description

BACKGROUND In a wireless communication network, such as a Fifth Generation (5G) New Radio (NR) network, a user equipment (UE) can initiate access by decoding a Synchronization Signal Block (SBB), which contains basic information to enable the UE to proceed with System Information Block (SIB) decoding followed by a Physical Random Access Channel (PRACH) transmission and attach procedure to attach the UE to the network. Once the attach is completed, channel condition information can be used to identify proper parameters, such as a modulation and coding scheme (MCS), rank indicator (RI), and precoding matrix indicator (PMI) for effective data traffic. For instance, based on the channel condition, a base station scheduler can select resource blocks and transmission parameters for a UE (e.g., MCS, RI, and PMI), which can then be used by a corresponding gNode B (gNB) to initiate data traffic. SUMMARY The following summary is a general overview of various embodiments disclosed herein and is not intended to be exhaustive or limiting upon the disclosed embodiments. Embodiments are better understood upon consideration of the detailed description below in conjunction with the accompanying drawings and claims. In an implementation, network equipment is described herein. The network equipment can include a memory that stores executable components and a processor that executes the executable components stored in the memory. The executable components can include a transmitter component that conducts a first transmission to a user equipment via a downlink communication channel using a first modulation and coding scheme (MCS), the first transmission including a demodulation reference signal (DMRS). The executable components can further include a receiver component that receives a second transmission from the user equipment via an uplink communication channel in response to the first transmission. The second transmission can include channel condition data, indicative of a condition of the downlink communication channel as observed by the user equipment based on the DMRS, and a hybrid automatic repeat request (HARQ) indicator corresponding to the first transmission. The executable components can additionally include a parameter adjustment component that determines a second MCS to be applied to a third transmission to the user equipment by modifying the first MCS based on the channel condition data. In another implementation, a method is described herein. The method can include transmitting, by a first device including a processor, a first transmission to a second device via a downlink channel, where the first transmission utilizes a first MCS and includes a DMRS. The method can also include receiving, by the first device, a second transmission from the second device in response to the transmitting of the first transmission. The second transmission can include channel quality data, indicative of a channel quality of the downlink channel as estimated by the second device based on the DMRS, and a hybrid automatic repeat request (HARQ) data corresponding to the first transmission. The method can further include 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. In an additional implementation, a non-transitory machine-readable medium including computer executable instructions is described herein. The instructions, when executed by a processor of a Node B, can facilitate performance of operations including transmitting a first message to a mobile device via a physical downlink shared channel using a first MCS, the first message including a DMRS; receiving a second message from the mobile device via an uplink communication channel in response to the first message, where the second message includes channel condition data, associated with a condition of the physical downlink shared channel as observed by the mobile device based on the DMRS, and an acknowledgement (ACK)/negative acknowledgement (NACK) indicator corresponding to the first message; and 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. DESCRIPTION OF DRAWINGS Various non-limiting embodiments of the subject disclosure are described with reference to the following figures, wherein like reference numerals refer to like parts throughout unless otherwise specified. FIG. 1 is a block diagram of a system that facilitates DMRS-based channel estimation and transmission adjustment in a communication system in accordance with various implementations described herein. FIG. 2 is a block diagram depicting an example implementation of the Node B shown in FIG. 1. FIG. 3 is a block diagram depicting an example implementation of the user equipment (UE) shown in FIG. 1. FIG. 4 is a block diagram of a system that facilitates UE configuration for DMRS-based channel est