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US-12627533-B2 - Demodulation reference signal based channel estimation for adjusting or stopping retransmission

US12627533B2US 12627533 B2US12627533 B2US 12627533B2US-12627533-B2

Abstract

Demodulation reference signal (DMRS) based channel estimation, e.g., for adjusting and/or stopping retransmissions, is described herein. A method as described herein can include receiving, by a device comprising a processor, a first transmission that is transmitted to the device by network equipment via a downlink channel, wherein the first transmission comprises a DMRS; estimating, by the device, a channel quality associated with the downlink channel based on the DMRS, resulting in an estimated channel quality; and transmitting, by the device to the network equipment via an uplink channel, a second transmission, the second transmission comprising channel quality data indicative of the estimated channel quality and hybrid automatic repeat request data corresponding to the first transmission.

Inventors

  • Ilya Portnik
  • Eran Goldstein
  • Jayaram Venguduswamy Srinivasan

Assignees

  • DELL PRODUCTS L.P.

Dates

Publication Date
20260512
Application Date
20230317

Claims (20)

  1. 1 . A user 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 receiver component that receives a first transmission, transmitted by network equipment to the user equipment via a downlink communication channel and using 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 user equipment; a channel estimation component that estimates a first condition of the downlink communication channel using the downlink resource blocks and based on the DMRS, resulting in a first estimated channel condition; and a channel reporting component that transmits a second transmission to the network equipment via an uplink communication channel, the second transmission comprising first channel condition data indicative of the first estimated channel condition and a hybrid automatic repeat request (HARQ) indicator corresponding to the first transmission, wherein the receiver component further receives a third transmission from the network equipment via the downlink communication channel, the third transmission comprising a channel state information reference signal (CSI-RS) and occupying the full bandwidth part associated with the user equipment, wherein the channel estimation component further estimates a second condition of the downlink communication channel over the full bandwidth part associated with the user equipment based on the CSI-RS, resulting in a second estimated channel condition, and wherein the transmitter component further transmits a fourth transmission to the network equipment, the fourth transmission comprising second channel condition data indicative of the second estimated channel condition.
  2. 2 . The user equipment of claim 1 , wherein the uplink communication channel is an uplink data channel, and wherein the second transmission further comprises a data payload directed to the network equipment.
  3. 3 . The user equipment of claim 1 , wherein the uplink communication channel is an uplink control channel, wherein the first channel condition data is represented using a defined number of bits, and wherein the defined number of bits is defined by a format of the uplink control channel.
  4. 4 . The user equipment of claim 1 , wherein the executable components further comprise: a configuration component that receives, from the network equipment, an instruction to provide the first channel condition data, wherein the channel estimation component estimates the first condition of the downlink communication channel based on the DMRS in response to the configuration component receiving the instruction.
  5. 5 . The user equipment of claim 4 , wherein the configuration component transmits, to the network equipment, an indication of a capability of the user equipment to estimate the first condition of the downlink communication channel based on the DMRS, and wherein the configuration component receives the instruction in response to transmitting of the indication.
  6. 6 . The user equipment of claim 4 , wherein the instruction comprises a reporting frequency, wherein the channel estimation component estimates the first condition of the downlink communication channel based on DMRSs, comprising the DMRS, as provided in first transmissions, comprising the first transmission and selected from transmissions from the network equipment to the user equipment according to the reporting frequency, and wherein the channel reporting component transmits the first channel condition data to the network equipment via second transmissions, comprising the second transmission, to the network equipment.
  7. 7 . The user equipment of claim 6 , wherein the channel estimation component estimates the first condition of the downlink communication channel based on each N-th DMRS of the DMRSs provided in the first transmissions, and wherein N is a number greater than zero and defined based on the reporting frequency.
  8. 8 . The user equipment of claim 1 , wherein the HARQ indicator is an acknowledgement, wherein the receiver component further receives a fifth transmission from the network equipment in response to the network equipment receiving the acknowledgement, and wherein the fifth transmission is adjusted relative to the first transmission based on the channel condition data.
  9. 9 . The user equipment of claim 1 , wherein the HARQ indicator is a negative acknowledgement, wherein the receiver component further receives a re-transmission of the first transmission from the network equipment in response to the network equipment receiving the negative acknowledgement, and wherein the re-transmission is adjusted relative to the first transmission based on the first channel condition data.
  10. 10 . The user equipment of claim 1 , wherein: the receiver component receives third transmissions, comprising the third transmission, from the network equipment at intervals of a period; and the channel estimation component estimates first conditions of the downlink communication channel, comprising the first condition, in response to the receiver component receiving first transmissions, comprising the first transmission, in which the CSI-RS is not present.
  11. 11 . A method, comprising: receiving, by a device comprising a processor, a first transmission that is transmitted to the device by network equipment via a downlink channel and using downlink resource blocks scheduled for the first transmission, wherein the first transmission comprises a demodulation reference signal (DMRS), and wherein the downlink resource blocks comprise less than a full bandwidth part associated with the device; estimating, by the device, a first channel quality associated with the downlink channel based on the DMRS and using the downlink resource blocks, resulting in a first estimated channel quality; transmitting, by the device to the network equipment via an uplink channel, a second transmission, the second transmission comprising first channel quality data indicative of the first estimated channel quality and hybrid automatic repeat request data corresponding to the first transmission; receiving, by the device, a third transmission from the network equipment via the downlink channel, the third transmission comprising a channel state information reference signal (CSI-RS) and occupying the full bandwidth part associated with the device; estimating, by the device, a second channel quality associated with the downlink channel over the full bandwidth part associated with the device based on the CSI-RS, resulting in a second estimated channel quality; and transmitting, by the device, a fourth transmission to the network equipment, the fourth transmission comprising second channel quality data indicative of the second estimated channel quality.
  12. 12 . The method of claim 11 , wherein the uplink channel is an uplink data channel, and wherein the second transmission further comprises a data payload directed to the network equipment.
  13. 13 . The method of claim 11 , wherein the uplink channel is an uplink control channel, and wherein the first channel quality data comprises a number of data bits, the number of data bits being defined based on a format of the uplink control channel.
  14. 14 . The method of claim 11 , further comprising: receiving, by the device from the network equipment, a configuration message instructing the device to provide the first channel quality data, wherein the estimating of the first channel quality is in response to the receiving of the configuration message.
  15. 15 . The method of claim 14 , further comprising: transmitting, by the device to the network equipment, an indication of a capability of the device to estimate the first channel quality associated with the downlink channel based on the DMRS, wherein the receiving of the request is in response to the transmitting of the indication.
  16. 16 . A non-transitory machine-readable medium comprising computer executable instructions that, when executed by a processor of a mobile device, facilitate performance of operations, the operations comprising: receiving a first transmission from a Node B via a physical downlink shared channel using 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 mobile device; estimating a first channel condition associated with the physical downlink shared channel based on the DMRS and using the downlink resource blocks, resulting in a first estimated channel condition; transmitting, to the Node B via a physical uplink channel, a second transmission, wherein the second transmission comprises first channel condition data associated with the first estimated channel condition and an acknowledgement/negative acknowledgement indicator corresponding to the first transmission; receiving a third transmission from the Node B via the physical downlink shared channel, the third transmission comprising a channel state information reference signal (CSI-RS) and occupying the full bandwidth part associated with the mobile device; estimating a second channel condition associated with the physical downlink shared channel over the full bandwidth part associated with the mobile device based on the CSI-RS, resulting in a second estimated channel condition; and transmitting a fourth transmission to the Node B, the fourth transmission comprising second channel condition data indicative of the second estimated channel condition.
  17. 17 . The non-transitory machine-readable medium of claim 16 , wherein the physical uplink channel is a physical uplink shared channel, and wherein the second transmission further comprises a data payload.
  18. 18 . The non-transitory machine-readable medium of claim 16 , wherein the physical uplink channel is a physical uplink control channel, and wherein the operations further comprise: embedding the first channel condition data into a data field of the second transmission, the data field being of a size that is defined based on a format of the physical uplink control channel.
  19. 19 . The non-transitory machine-readable medium of claim 16 , wherein the operations further comprise: receiving a configuration message from the Node B instructing the mobile device to provide the first channel condition data, wherein the estimating of the first channel condition is in response to the receiving of the configuration message.
  20. 20 . The non-transitory machine-readable medium of claim 19 , wherein the configuration message is a first configuration message, and wherein the operations further comprise: transmitting a second configuration message to the Node B, the second configuration message indicating a capability of the mobile device to estimate the first channel condition associated with the physical downlink shared channel based on the DMRS, wherein the receiving of the first configuration message is in response to the transmitting of the second configuration message.

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, a user equipment is described herein. The user 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 receiver component that receives a first transmission, transmitted by network equipment to the user equipment via a downlink communication channel, the first transmission including a demodulation reference signal (DMRS). The executable components can also include a channel estimation component that estimates a condition of the downlink communication channel based on the DMRS, resulting in an estimated channel condition. The executable components can further include a channel reporting component that transmits a second transmission to the network equipment via an uplink communication channel, the second transmission including channel condition data indicative of the estimated channel condition and a hybrid automatic repeat request (HARQ) indicator corresponding to the first transmission. In another implementation, a method is described herein. The method can include receiving, by a device including a processor, a first transmission that is transmitted to the device by network equipment via a downlink channel, where the first transmission comprises a DMRS. The method can additionally include estimating, by the device, a channel quality associated with the downlink channel based on the DMRS, resulting in an estimated channel quality. Further, the method can include transmitting, by the device to the network equipment via an uplink channel, a second transmission, the second transmission including channel quality data indicative of the estimated channel quality and hybrid automatic repeat request data corresponding to the first transmission. 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 mobile device, can facilitate performance of operations including receiving a first transmission from a Node B via a physical downlink shared channel, the first transmission including a DMRS; estimating a channel condition associated with the physical downlink shared channel based on the DMRS, resulting in an estimated channel condition; and transmitting, to the Node B via a physical uplink channel, a second transmission, wherein the second transmission includes channel condition data associated with the estimated channel condition and an acknowledgement/negative acknowledgement indicator corresponding to the first transmission. 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 estimation in accordance with various implementations described herein. FIGS. 5-7 are messaging flow diagrams depicting various example procedures that can be performed by a Node B and a UE in accordance with various implementations described herein. FIG. 8 is a block diagram of a system that facilitates transmission adjustment according to DMRS-based feedback in accordance with various implementations described h