US 12,010,056 B2Granted

Demodulation reference signal (DMRS) sequence signaling

AssigneeQUALCOMM Incorporated

InventorsAnantha Krishna Karthik Nagarajan, Jun Ma, Morteza Soltani, Xiaoxia Zhang, Iyab Issam Sakhnini, Wooseok Nam, Tao Luo, Peter Gaal, Juan Montojo

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Abstract

Certain aspects of the present disclosure provide techniques for demodulation reference signal (DMRS) sequence selection. One aspect provides a method for wireless communication by a first wireless node. The method generally includes selecting a type of DMRS sequence to be used for communication with a second wireless node based on a signal quality associated with the communication, receiving a message having the type of DMRS sequence, and performing channel estimation based on the DMRS sequence using the message.

Claims30

Dependent claims

An apparatus for wireless communication by a first wireless node, comprising one or more processors coupled to a memory and configured to:

select a type of demodulation reference signal (DMRS) sequence to be used for communication with a second wireless node based on a signal quality associated with the communication;
generate a message having the type of DMRS sequence;
and
transmit the message to the second wireless node,
wherein the one or more processors are configured to:
determine a modulation and coding scheme (MCS) to be used for the communication with the second wireless node and select the type of DMRS sequence based on the MCS, wherein the selected type of DMRS sequence comprises a pseudo-noise (PN) sequence when the MCS is a first MCS and the selected type of DMRS sequence comprises a Zadoff-Chu (ZC) sequence when the MCS is a second MCS, the second MCS having a higher order than the first MCS;
or
select the type of DMRS sequence based on a mapping between one or more candidate MCSs and one or more candidate DMRS sequence types;
or
select a length of the DMRS sequence based at least in part on a Doppler spread associated with the communication.

7 more elements

An apparatus for wireless communication by a first wireless node, comprising one or more processors coupled to a memory and configured to:

select a type of demodulation reference signal (DMRS) sequence to be used for communication with a second wireless node based on a signal quality associated with the communication;
receive, from the second wireless node, a message having the type of DMRS sequence;
and
perform channel estimation based on the type of DMRS sequence using the message,
wherein the one or more processors are configured to:
determine a modulation and coding scheme (MCS) to be used for the communication with the second wireless node and select the type of DMRS sequence based on the MCS, wherein the selected the type of DMRS sequence comprises a pseudo-noise (PN) sequence when the MCS is a first MCS and the selected the type of DMRS sequence comprises a Zadoff-Chu (ZC) sequence when the MCS is a second MCS, the second MCS having a higher order than the first MCS;
or
select the type of DMRS sequence based on a mapping between one or more candidate MCSs and one or more candidate DMRS sequence types;
or
select a length of the DMRS sequence based at least in part on a Doppler spread associated with the communication.

7 more elements

A method for wireless communication by a first wireless node, comprising:

selecting a type of demodulation reference signal (DMRS) sequence to be used for communication with a second wireless node based on a signal quality associated with the communication;
generating a message having the type of DMRS sequence;
and
transmitting the message to the second wireless node,
wherein the method further comprises:
determining a modulation and coding scheme (MCS) to be used for the communication with the second wireless node and selecting the type of DMRS sequence based on the MCS, wherein the selected type of DMRS sequence comprises a pseudo-noise (PN) sequence when the MCS is a first MCS and the selected type of DMRS sequence comprises a Zadoff-Chu (ZC) sequence when the MCS is a second MCS, the second MCS having a higher order than the first MCS;
or
selecting the type of DMRS sequence based on a mapping between one or more candidate MCSs and one or more candidate DMRS sequence types;
or
selecting a length of the DMRS sequence based at least in part on a Doppler spread associated with the communication.

7 more elements

A method for wireless communication by a first wireless node, comprising:

selecting a type of demodulation reference signal (DMRS) sequence to be used for communication with a second wireless node based on a signal quality associated with the communication;
receiving, from the second wireless node, a message having the type of DMRS sequence;
and
performing channel estimation based on the DMRS sequence using the message,
wherein the method further comprises:
determining a modulation and coding scheme (MCS) to be used for the communication with the second wireless node and selecting the type of DMRS sequence based on the MCS, wherein the selected the type of DMRS sequence comprises a pseudo-noise (PN) sequence when the MCS is a first MCS and the selected the type of DMRS sequence comprises a Zadoff-Chu (ZC) sequence when the MCS is a second MCS, the second MCS having a higher order than the first MCS;
or
selecting the type of DMRS sequence based on a mapping between one or more candidate MCSs and one or more candidate DMRS sequence types;
or
selecting a length of the DMRS sequence based at least in part on a Doppler spread associated with the communication.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/453,814Filed 5 Nov 2021 · us provisional application
Priority: 25 Jan 2021
Published: US 2022/0239427 A128 Jul 2022
Granted: 11 Jun 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04L 5/0048
Arrangements for allocating sub-channels of the transmission path: allocation of pilot signals, i.e. of signals known to the receiver
H04L 5/0051
Allocation of pilot signals, i.e. of signals known to the receiver: of dedicated pilots, i.e. pilots destined for a single user or terminal
H04L 5/006
Allocation criteria: quality of the received signal, e.g. BER, SNR, water filling
H04L 5/0094
Signalling for the administration of the divided path, e.g. signalling of configuration information: indication of how sub-channels of the path…

Family

Application63/141,330Us provisional application · filed 25 Jan 2021
US 2022/0239427 A1Pre-grant publication · published 28 Jul 2022
US 12,010,056 B2This patent

From the US filing history. Foreign family members aren’t listed.

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