Reference signal parameter modification for improved channel estimation in wireless communication systems

1 . A method for wireless communication, comprising:

receiving, by a first communication node from a second communication node, a Radio Resource Control (RRC) message comprising at least one parameter of a reference signal;

receiving, by the first communication node from the second communication node, a Downlink Control Information (DCI) format message or a Medium Access Control (MAC) message that is configured to cause the first communication node to modify the at least one parameter of the reference signal included in the RRC message;

modifying the at least one parameter of the reference signal based on the Downlink Control Information (DCI) format message or the Medium Access Control (MAC) message; and

transmitting, after the modifying of the at least one parameter of the reference signal, by the first communication node to the second communication node, the reference signal,

wherein at least one modified parameter comprises a time-domain position of a first symbol of the reference signal and a number of repeated transmissions of the first reference signal, and

wherein the first communication node is a wireless device and the second communication node is a network node.

2 . The method of claim 1 , wherein an indication corresponding to the number of repeated transmissions is signaled in the DCI message or the MAC message, and the indication comprises a number of times (M) the reference signal is repeated within a predetermined time period or repeated consecutively over available OFDM symbols, wherein M is an integer that is greater than one.

3 . The method of claim 1 , wherein the reference signal comprises a periodic reference signal, and wherein an indication corresponding to the number of repeated transmissions is signaled in the DCI message or the MAC message, and the indication comprises a number of times (K) the reference signal is repeated in each period in N consecutive periods, and wherein K and N are positive integers.

4 . The method of claim 1 , wherein an indication corresponding to the number of repeated transmissions is signaled in the DCI message or the MAC message, and the indication comprises a time interval of the reference signal between adjacent transmissions.

5 . The method of claim 1 , wherein an indication corresponding to the number of repeated transmissions is signaled in the DCI message or the MAC message, and the indication comprises a number of times (K) the reference signal is repeated in a time slot.

6 . The method of claim 1 , wherein the reference signal is a sounding reference signal (SRS), a demodulation reference signal (DMRS) or a phase tracking reference signal (PTRS).

7 . A method for wireless communication, comprising:

transmitting, by a second communication node to a first communication node, a Radio Resource Control (RRC) message comprising at least one parameter of a reference signal;

transmitting, by the second communication node to the first communication node, a Downlink Control Information (DCI) format message or a Medium Access Control (MAC) message that is configured to cause the first communication node to modify the at least one parameter of the reference signal included in the RRC message;

receiving, by the second communication node from the first communication node, the reference signal,

wherein before the receiving of the reference signal, at least one parameter of the reference signal has been modified as the at least one modified parameter by the first communication node, based on the Downlink Control Information (DCI) format message or the Medium Access Control (MAC) message,

wherein at least one modified parameter comprises a time-domain position of a first symbol of the reference signal, and a number of repeated transmissions of the reference signal; and

performing a channel estimation operation based on the reference signal, and

wherein the first communication node is a wireless device and the second communication node is a network node.

8 . The method of claim 7 , wherein an indication corresponding to the number of repeated transmissions is signaled in the DCI message or the MAC message, and the indication comprises a number of times (M) the reference signal is repeated within a predetermined time period or repeated consecutively over available OFDM symbols, wherein M is an integer that is greater than one.

9 . The method of claim 7 , wherein the reference signal comprises a periodic reference signal, and wherein an indication corresponding to the number of repeated transmissions is signaled in the DCI message or the MAC message, and the indication comprises a number of times (K) the reference signal is repeated in each period in N consecutive periods, and wherein K and N are positive integers.

10 . The method of claim 7 , wherein an indication corresponding to the number of repeated transmissions is signaled in the DCI message or the MAC message, and the indication comprises a time interval of the reference signal between adjacent transmissions.

11 . The method of claim 7 , wherein an indication corresponding to the number of repeated transmissions is signaled in the DCI message or the MAC message, and the indication comprises a number of times (K) the reference signal is repeated in a time slot.

12 . The method of claim 7 , wherein the reference signal is a sounding reference signal (SRS), a demodulation reference signal (DMRS) or a phase tracking reference signal (PTRS).

13 . A method for wireless communication, comprising:

receiving, by a multiple-input multiple-output (MIMO) first communication node from a second communication node, a Radio Resource Control (RRC) message comprising configuration parameters of a second reference signal associated with a first reference signal, wherein the configuration parameters include an identifier of the second reference signal and an indication that the second reference signal repeats at least a portion of the first reference signal;

receiving, by the MIMO first communication node from the second communication node, a Downlink Control Information (DCI) format message or a Medium Access Control (MAC) message that is configured to cause the MIMO first communication node to modify at least one of the configuration parameters of the second reference signal included in the RRC message;

modifying at least one of the configuration parameters of the second reference signal as at least one modified parameter based on the Downlink Control Information (DCI) format message or the Medium Access Control (MAC) message;

transmitting, after the modifying of the at least one of the configuration parameters of the second reference signal, by the multiple-input multiple-output (MIMO) first communication node to the second communication node, the first reference signal and the second reference signal,

wherein the first reference signal and the second reference signal are transmitted from a common antenna port to enable a joint channel estimation operation,

wherein the at least one modified parameter comprises an indication whether the second reference signal is being repeated with respect to the first reference signal, a number of repetitions of the second reference signal, and a time-domain position of a first symbol of the second reference signal with respect to the first reference signal, and

wherein the MIMO first communication node is a wireless device and the second communication node is a network node.

14 . The method of claim 13 , wherein the first reference signal is a sounding reference signal (SRS), a demodulation reference signal (DMRS) or a phase tracking reference signal (PTRS).

15 . A method for wireless communication, comprising:

transmitting, by a second communication node to a multiple-input multiple-output (MIMO) first communication node, a Radio Resource Control (RRC) message comprising configuration parameters of a second reference signal associated with a first reference signal, wherein the configuration parameters include an identifier of the second reference signal and an indication that the second reference signal repeats at least a portion of the first reference signal;

transmitting, by the second communication node to the MIMO first communication node, a Downlink Control Information (DCI) format message or a Medium Access Control (MAC) message that is configured to cause the MIMO first communication node to modify at least one of the configuration parameters of the second reference signal included in the RRC message;

receiving, by the second communication node from the multiple-input multiple-output (MIMO) first communication node, the first reference signal and the second reference signal,

wherein the first reference signal and the second reference signal are configured to be transmitted from a common antenna port to enable a joint channel estimation operation,

wherein before the receiving of the first reference signal and the second reference signal, at least one of the configuration parameters of the second reference signal has been modified as at least one modified parameter by the first communication node, based on the Downlink Control Information (DCI) format message, or the Medium Access Control (MAC) message, and

wherein the at least one modified parameter comprises an indication whether the second reference signal is being repeated with respect to the first reference signal, a number of repetitions of the second reference signal, and a time-domain position of a first symbol of the second reference signal with respect to the first reference signal; and

performing, based on the first reference signal and the second reference signal, the joint channel estimation operation, and

wherein the MIMO first communication node is a wireless device and the second communication node is a network node.

16 . The method of claim 15 , wherein the first reference signal is a sounding reference signal (SRS), a demodulation reference signal (DMRS) or a phase tracking reference signal (PTRS).