CN111953625A

CN111953625A - Communication method and device

Info

Publication number: CN111953625A
Application number: CN201910413516.1A
Authority: CN
Inventors: 费永强; 谢信乾; 郭志恒; 程型清
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2020-11-17
Also published as: WO2020233370A1

Abstract

The application relates to a communication method and a device, wherein the communication method comprises the following steps: sending DCI to a terminal device, wherein the DCI is only used for indicating the terminal device to send a first reference signal; receiving the first reference signal indicated by the DCI from the terminal device. In the embodiment of the application, the first reference signal does not need to be sent together with the data, and then when the network device has a requirement, the terminal device can send the first reference signal to the network device independently, so that the flexibility of sending the first reference signal is improved. Because the first reference signal is sent more flexibly, the terminal device can send the first reference signal to the network device for multiple times, and the network device can also receive the first reference signal from the terminal device for multiple times, so that the accuracy of the network device in channel estimation on the terminal device is improved by enhancing the coverage of the first reference signal.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communication method and device.

Background

In a wireless communication system, such as a New Radio (NR) communication system, information exchanged between a terminal device and a base station is carried through a physical channel. Uplink data sent by the terminal device is usually carried through a Physical Uplink Shared Channel (PUSCH); uplink control information transmitted by the terminal device is usually carried through a Physical Uplink Control Channel (PUCCH). In addition, the terminal device may also transmit a reference signal, and the base station may estimate channel responses or channel qualities of the terminal device on different frequencies by receiving the reference signal from the terminal device.

At present, a terminal device transmits a reference signal and uplink data together, so that the terminal device can transmit the reference signal only when the uplink data is transmitted. When the terminal device is located in a deep coverage area such as a basement or a cell edge, a wireless signal transmitted by the terminal device will be very weak when reaching the base station, and the base station needs to transmit more reference signals through the terminal device to perform more accurate channel estimation. However, uplink data sent by the terminal device to the base station is generally not too much, so that the base station cannot obtain enough reference signals, and the base station estimates the uplink channel of the terminal device according to fewer reference signals, which may cause the estimation result to be inaccurate. If the estimation of the uplink channel of the terminal device by the base station is not accurate enough, demodulation and the like of the uplink data are affected, so that the base station is likely to fail to correctly obtain the uplink data sent by the terminal device. Therefore, how to improve the accuracy of uplink channel estimation of the base station to the terminal device is a problem that needs to be solved at present.

Disclosure of Invention

The embodiment of the application provides a communication method and device, which are used for improving the accuracy of uplink channel estimation of a terminal device by a network device.

In a first aspect, a first communication method is provided, the method including: sending DCI to a terminal device, wherein the DCI is only used for indicating the terminal device to send a first reference signal; receiving the first reference signal indicated by the DCI from the terminal device.

The method may be performed by a first communication device, which may be a communication apparatus or a communication device, such as a system-on-a-chip, capable of supporting the communication apparatus to implement the functionality required for the method. Illustratively, the communication device is a network device.

In this embodiment of the present application, the network device may only instruct to transmit the first reference signal through the DCI, and the terminal device may transmit the first reference signal to the network device after receiving the DCI, so that the first reference signal does not need to be transmitted together with the data, and when the network device has a requirement, the terminal device may independently transmit the first reference signal to the network device, thereby improving flexibility of transmitting the first reference signal. Because the first reference signal is sent more flexibly, the terminal device can send the first reference signal to the network device for multiple times, and the network device can also receive the first reference signal from the terminal device for multiple times, so that the accuracy of the network device in channel estimation on the terminal device is improved by enhancing the coverage of the first reference signal.

With reference to the first aspect, in a possible implementation manner of the first aspect, the DCI includes a first field; wherein the content of the first and second substances,

when the value of the first field is a first value, the DCI is only used for indicating the terminal equipment to send a first reference signal; or the like, or, alternatively,

and when the value of the first field belongs to a first range, the DCI is only used for indicating the terminal equipment to send the first reference signal.

The DCI may instruct the terminal device to transmit the first reference signal only through the included first field, and other fields included in the DCI may also indicate other information, which may improve utilization of the DCI. The first field may enable DCI to only indicate the terminal device to transmit the first reference signal through one value, so that other values of the first field may also indicate other contents, or the DCI may also enable DCI to only indicate the terminal device to transmit the first reference signal through a plurality of values (a first range), which is beneficial to improving a fault tolerance mechanism of the terminal device.

With reference to the first aspect, in a possible implementation manner of the first aspect, the first field is an MCS field.

Currently, some states of the MCS field are not utilized, that is, some states are not used for indicating the MCS, so the embodiments of the present application may utilize these states to cause the DCI to instruct only the terminal device to transmit the first reference signal. The invalid state of the MCS field is utilized, the utilization rate of the field is improved, a new field does not need to be added in the DCI, and the performance reduction caused by the change of the format of the DCI can be avoided.

With reference to the first aspect, in a possible implementation manner of the first aspect, the first range includes at least two of the following values: 11100, 11101, 11110, or 11111.

The above values are values corresponding to several invalid states of the MCS field, and thus the first range may include at least two of the above values, thereby utilizing the invalid states of the MCS field.

With reference to the first aspect, in one possible embodiment of the first aspect, the first value is 11100, 11101, 11110, or 11111.

Similarly, the above values are values corresponding to several invalid states of the MCS field, and therefore the first value may be one of the above values, so as to utilize the invalid state of the MCS field.

With reference to the first aspect, in a possible implementation manner of the first aspect, different values of the first field correspond to different initial phase determination manners, and the determination manner of the initial phase of the sequence of the first reference signal, which is carried on a time domain symbol in which the first reference signal is sent, corresponds to a value of the first field.

The value of the first field can only indicate the terminal device to send the first reference signal, and can also indicate the determination mode of the initial phase of the sequence of the first reference signal, so that the meaning indicated by the first field is richer.

With reference to the first aspect, in a possible implementation manner of the first aspect, the first reference signal is carried in at least two slots, and initial phases of sequences of the first reference signal carried by the at least two slots are the same or different.

The initial phases of the sequences are the same, so that the two sequences can be considered to be the same, and therefore, by making the initial phases of the sequences on different OFDM symbols the same, the sequences carried by different OFDM symbols can be made the same, and by making the initial phases of the sequences on different OFDM symbols different, the sequences carried by different OFDM symbols can be made different.

With reference to the first aspect, in a possible implementation manner of the first aspect, the initial phases of the sequences of the first reference signals carried by the at least two slots are the same, and the determining includes: determining an initial phase of a sequence of the first reference signal in the at least two slots according to an index of a first slot of the at least two slots and an index of a first time domain symbol in the first slot, the first slot being a predefined slot of the at least two slots.

The first time slot may be a predefined time slot, for example, the first time slot is predefined as a first time slot of the at least two time slots, or as a last time slot of the at least two time slots, or as another time slot of the at least two time slots except for the first time slot and the last time slot, and the like, and may be specifically specified by a protocol or configured by a network device. The first time domain symbol may be a predefined time domain symbol, for example, the first time domain symbol is predefined as a first time domain symbol in the first time slot, or as a last time domain symbol in the first time slot, or as a first time domain symbol in the first time slot for carrying a sequence of the first reference signal, or may also be any one time domain symbol in the first time slot, and so on, and may specifically be predefined by a protocol, or configured by a network device. It can be seen that in this initial phase determination mode, the sequences of the first reference signal carried by the time domain symbols in at least two slots used for transmitting the first reference signal are all the same. Therefore, if such an initial phase determination manner is adopted, the sequences of the first reference signals carried by the time domain symbols where the first reference signals transmitted at one time are located can be made to be the same. The network device may combine the sequences of the first reference signals carried by the four time domain symbols of the time slot 0 and the time slot 1, and then perform channel estimation according to the combined signals. The channel estimation mode is beneficial to reducing noise and improving the accuracy of channel estimation.

With reference to the first aspect, in a possible implementation manner of the first aspect, the initial phases of the sequences of the first reference signals carried by the at least two slots are different, and the determining includes: determining an initial phase of a sequence of the first reference signal in the first slot according to an index of a first slot of the at least two slots and an index of a first time domain symbol in the first slot.

The first time domain symbol may be a predefined time domain symbol, for example, the first time domain symbol is predefined as a first time domain symbol in a time slot, or a last time domain symbol in the time slot, or a first time domain symbol in the time slot for carrying a sequence of the first reference signal, or may also be any one time domain symbol in the time slot, and so on, and may specifically be predefined by a protocol, or configured by a network device. Since the "first slot" in this initial phase determination mode may be any one of at least two slots, the first time domain symbol may not be "predefined" for a certain slot, but may be applicable for all slots. For example, the first time domain symbol is the first time domain symbol in a slot, then if the first slot is slot 0, the first time domain symbol is the first time domain symbol in slot 0, and if the first slot is slot 1, the first time domain symbol is the first time domain symbol in slot 1. It can be seen that in this initial phase determination mode, the sequence of the first reference signal carried by the time domain symbol in one time slot is the same, and the sequence of the first reference signal carried by different time slots may be different. Therefore, if such an initial phase determination manner is adopted, the sequences of the first reference signals carried by the time domain symbols in one slot can be made identical. The network device may combine the sequences of the first reference signals carried by the two time domain symbols of the time slot 0, perform channel estimation according to the combined signals, combine the sequences of the first reference signals carried by the two time domain symbols of the time slot 1, perform channel estimation according to the combined signals, and combine the two channel estimation results. The channel estimation mode is beneficial to reducing noise and improving the accuracy of channel estimation.

With reference to the first aspect, in a possible implementation manner of the first aspect, the DCI further includes one or more of a time domain resource allocation resource field, a frequency domain resource allocation resource field, or a transmission power control command field, where,

the time domain resource allocation field is used for indicating the time domain resources occupied by the first reference signal;

the frequency domain resource allocation field is used for indicating the frequency domain resources occupied by the first reference signal;

the transmission power control command field is used for indicating the transmission power of the first reference signal.

The time domain resource allocation resource field, the frequency domain resource allocation resource field, and the transmission power control command field are originally time frequency resources and transmission power used for indicating the PUSCH scheduled by the DCI.

With reference to the first aspect, in a possible implementation manner of the first aspect, the method further includes: and sending RRC signaling to the terminal equipment, wherein the RRC signaling is used for indicating one or more of time domain resources, frequency domain resources and sending power occupied by the first reference signal.

The time-frequency resource or the transmission power of the first reference signal and the like can also be configured semi-statically through the RRC signaling instead of being indicated by the DCI, so that the DCI does not need to indicate excessive information, and the terminal equipment only needs to transmit the first reference signal according to the resource configured by the RRC signaling.

With reference to the first aspect, in a possible implementation manner of the first aspect, the DCI format is DCI format 0_0 or DCI format 0_ 1.

Of course, these two DCI formats are only examples, and the embodiments of the present application do not limit the DCI formats.

In a second aspect, a second communication method is provided, the method comprising: receiving Downlink Control Information (DCI), wherein the DCI is only used for indicating terminal equipment to send a first reference signal; and the terminal equipment transmits the first reference signal according to the DCI.

The method may be performed by a second communication device, which may be a communication apparatus or a communication device capable of supporting a communication apparatus to implement the functions required by the method, such as a system-on-a-chip. Illustratively, the communication device is a terminal device.

With reference to the second aspect, in a possible implementation manner of the second aspect, the DCI is not used for scheduling data.

With reference to the second aspect, in a possible implementation manner of the second aspect, the DCI includes a first field; wherein the content of the first and second substances,

With reference to the second aspect, in a possible implementation manner of the second aspect, the first field is an MCS field.

With reference to the second aspect, in a possible implementation manner of the second aspect, the first range includes at least two of the following values: 11100, 11101, 11110, or 11111.

With reference to the second aspect, in one possible embodiment of the second aspect, the first value is 11100, 11101, 11110, or 11111.

With reference to the second aspect, in a possible implementation manner of the second aspect, different values of the first field correspond to different initial phase determination manners, and the method further includes: and determining a determination mode of an initial phase of the sequence of the first reference signal carried on a time domain symbol for transmitting the first reference signal according to the value of the first field.

With reference to the second aspect, in a possible implementation manner of the second aspect, the first reference signal is carried in at least two time slots, and initial phases of sequences of the first reference signal carried by the at least two time slots are the same or different.

With reference to the second aspect, in a possible implementation manner of the second aspect, the initial phases of the sequences of the first reference signals carried by the at least two timeslots are the same, and the determining includes: determining an initial phase of a sequence of the first reference signal in the at least two slots according to an index of a first slot of the at least two slots and an index of a first time domain symbol in the first slot, the first slot being a predefined slot of the at least two slots.

With reference to the second aspect, in a possible implementation manner of the second aspect, the initial phases of the sequences of the first reference signals carried by the at least two timeslots are different, and the determining includes: determining an initial phase of a sequence of the first reference signal in the first slot according to an index of a first slot of the at least two slots and an index of a first time domain symbol in the first slot.

With reference to the second aspect, in a possible implementation manner of the second aspect, the method further includes one or any combination of the following:

determining the time domain resource occupied by the first reference signal according to the time domain resource allocation field included in the DCI;

determining the frequency domain resources occupied by the first reference signal according to the frequency domain resource allocation field included in the DCI; or the like, or, alternatively,

and determining the transmission power of the first reference signal according to a transmission power control command field included in the DCI.

With reference to the second aspect, in one possible implementation manner of the second aspect, the method further includes: and receiving RRC signaling from the network equipment, and determining one or more of time domain resources, frequency domain resources and transmission power occupied by the first reference signal according to the RRC signaling.

With reference to the second aspect, in a possible implementation manner of the second aspect, the format of the DCI is DCI format 0_0 or DCI format 0_ 1.

With regard to the technical effects of the second aspect or of various possible embodiments of the second aspect, reference may be made to the introduction to the technical effects of the respective embodiments of the first aspect or of the first aspect.

In a third aspect, a first communication device is provided, for example, the first communication device as described above. The communication device is configured to perform the method of the first aspect or any possible implementation manner of the first aspect. In particular, the communication device may comprise means, for example comprising a processing means and a transceiver means, for performing the method of the first aspect or any possible implementation manner of the first aspect. Illustratively, the communication device is a communication apparatus. Illustratively, the communication device is a network device. Wherein the content of the first and second substances,

the processing module is configured to determine DCI, where the DCI is only used to instruct the terminal device to transmit a first reference signal;

the transceiver module is configured to send the DCI to a terminal device, where the DCI is only used to instruct the terminal device to send a first reference signal;

the transceiver module is further configured to receive the first reference signal indicated by the DCI from the terminal device.

With reference to the third aspect, in a possible implementation manner of the third aspect, the DCI includes a first field; wherein the content of the first and second substances,

With reference to the third aspect, in a possible implementation manner of the third aspect, the first field is an MCS field.

With reference to the third aspect, in a possible implementation manner of the third aspect, the first range includes at least two of the following values: 11100, 11101, 11110, or 11111.

With reference to the third aspect, in a possible implementation manner of the third aspect, the first value is 11100, 11101, 11110, or 11111.

With reference to the third aspect, in a possible implementation manner of the third aspect, different values of the first field correspond to different initial phase determination manners, and the determination manner of the initial phase of the sequence of the first reference signal, which is carried on a time domain symbol in which the first reference signal is sent, corresponds to a value of the first field.

With reference to the third aspect, in a possible implementation manner of the third aspect, the first reference signal is carried in at least two time slots, and initial phases of sequences of the first reference signal carried by the at least two time slots are the same or different.

With reference to the third aspect, in a possible implementation manner of the third aspect, the initial phases of the sequences of the first reference signals carried by the at least two timeslots are the same, and the determining includes: determining an initial phase of a sequence of the first reference signal in the at least two slots according to an index of a first slot of the at least two slots and an index of a first time domain symbol in the first slot, the first slot being a predefined slot of the at least two slots.

With reference to the third aspect, in a possible implementation manner of the third aspect, initial phases of the sequences of the first reference signals carried by the at least two timeslots are different, and the determining includes: determining an initial phase of a sequence of the first reference signal in the first slot according to an index of a first slot of the at least two slots and an index of a first time domain symbol in the first slot.

With reference to the third aspect, in a possible implementation manner of the third aspect, the DCI further includes one or more of a time domain resource allocation resource field, a frequency domain resource allocation resource field, or a transmission power control command field, where,

With reference to the third aspect, in a possible implementation manner of the third aspect, the transceiver module is further configured to send, to the terminal device, an RRC signaling, where the RRC signaling is used to indicate one or more of a time domain resource, a frequency domain resource, and a transmission power occupied by the first reference signal.

With reference to the third aspect, in a possible implementation manner of the third aspect, the format of the DCI is DCI format 0_0 or DCI format 0_ 1.

With regard to the technical effects of the third aspect or of various possible embodiments of the third aspect, reference may be made to the introduction of the technical effects of the respective embodiments of the first aspect or of the first aspect.

In a fourth aspect, a second communication device is provided, for example the communication device is the first communication device as described above. The communication device is configured to perform the method of the second aspect or any possible implementation manner of the second aspect. In particular, the communication device may comprise means for performing the method of the second aspect or any possible implementation manner of the second aspect, for example comprising a processing means and a transceiver means. Illustratively, the communication device is a communication apparatus. Illustratively, the communication device is a terminal device. Wherein the content of the first and second substances,

the receiving and sending module is used for receiving DCI, and the DCI is only used for indicating terminal equipment to send a first reference signal;

the processing module is configured to determine that the DCI only instructs a terminal device to transmit a first reference signal;

the transceiver module is further configured to transmit the first reference signal according to the DCI.

With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, the DCI is not used for scheduling data.

With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, the DCI includes a first field; wherein the content of the first and second substances,

With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, the first field is an MCS field.

With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, the first range includes at least two of the following values: 11100, 11101, 11110, or 11111.

With reference to the fourth aspect, in one possible implementation manner of the fourth aspect, the first value is 11100, 11101, 11110, or 11111.

With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, different values of the first field correspond to different initial phase determination manners, and the processing module is configured to determine, according to the value of the first field, a determination manner of an initial phase of a sequence of the first reference signal carried on a time domain symbol in which the first reference signal is sent.

With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, the first reference signal is carried in at least two time slots, and initial phases of sequences of the first reference signal carried by the at least two time slots are the same or different.

With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, the initial phases of the sequences of the first reference signals carried by the at least two timeslots are the same, and the determining includes: determining an initial phase of a sequence of the first reference signal in the at least two slots according to an index of a first slot of the at least two slots and an index of a first time domain symbol in the first slot, the first slot being a predefined slot of the at least two slots.

With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, the initial phases of the sequences of the first reference signals carried by the at least two timeslots are different, and the determining includes: determining an initial phase of a sequence of the first reference signal in the first slot according to an index of a first slot of the at least two slots and an index of a first time domain symbol in the first slot.

With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, the processing module is further configured to perform one or any combination of the following:

With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, the transceiver module is further configured to receive an RRC signaling from the network device, and determine one or more of a time domain resource, a frequency domain resource, and a transmission power occupied by the first reference signal according to the RRC signaling.

With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, the format of the DCI is DCI format 0_0 or DCI format 0_ 1.

With regard to the technical effects of the fourth aspect or of various possible embodiments of the fourth aspect, reference may be made to the introduction to the technical effects of the second aspect or of the respective embodiments of the second aspect.

In a fifth aspect, a third communication device is provided, for example a first communication device as described above. The communication device comprises a processor and a transceiver coupled to each other for implementing the method as described in the first aspect or in the various possible designs of the first aspect. Illustratively, the communication means is a chip provided in the communication device. Illustratively, the communication device is a network device. Wherein, the transceiver is implemented by an antenna, a feeder, a codec, etc. in the communication device, for example, or, if the communication device is a chip disposed in the communication device, the transceiver is, for example, a communication interface in the chip, and the communication interface is connected with a radio frequency transceiving component in the communication device to implement transceiving of information by the radio frequency transceiving component. Wherein the content of the first and second substances,

the processor is configured to determine DCI, where the DCI is only used to instruct the terminal device to transmit a first reference signal;

the transceiver is configured to send the DCI to a terminal device, where the DCI is only used to instruct the terminal device to send a first reference signal;

the transceiver is further configured to receive the first reference signal indicated by the DCI from the terminal device.

With reference to the fifth aspect, in a possible embodiment of the fifth aspect, the DCI includes a first field; wherein the content of the first and second substances,

With reference to the fifth aspect, in a possible implementation manner of the fifth aspect, the first field is an MCS field.

With reference to the fifth aspect, in a possible implementation manner of the fifth aspect, the first range includes at least two of the following values: 11100, 11101, 11110, or 11111.

With reference to the fifth aspect, in one possible embodiment of the fifth aspect, the first value is 11100, 11101, 11110, or 11111.

With reference to the fifth aspect, in a possible implementation manner of the fifth aspect, different values of the first field correspond to different initial phase determination manners, and the determination manners of the initial phase of the sequence of the first reference signal, which are carried on a time domain symbol in which the first reference signal is sent, correspond to the values of the first field.

With reference to the fifth aspect, in a possible implementation manner of the fifth aspect, the first reference signal is carried in at least two time slots, and initial phases of sequences of the first reference signal carried by the at least two time slots are the same or different.

With reference to the fifth aspect, in a possible implementation manner of the fifth aspect, the initial phases of the sequences of the first reference signals carried by the at least two timeslots are the same, and the determining includes: determining an initial phase of a sequence of the first reference signal in the at least two slots according to an index of a first slot of the at least two slots and an index of a first time domain symbol in the first slot, the first slot being a predefined slot of the at least two slots.

With reference to the fifth aspect, in a possible implementation manner of the fifth aspect, the initial phases of the sequences of the first reference signals carried by the at least two slots are different, and the determining includes: determining an initial phase of a sequence of the first reference signal in the first slot according to an index of a first slot of the at least two slots and an index of a first time domain symbol in the first slot.

With reference to the fifth aspect, in a possible implementation manner of the fifth aspect, the DCI further includes one or more of a time domain resource allocation resource field, a frequency domain resource allocation resource field, or a transmission power control command field, wherein,

With reference to the fifth aspect, in a possible implementation manner of the fifth aspect, the transceiver is further configured to send, to the terminal device, an RRC signaling, where the RRC signaling is used to indicate one or more of a time domain resource, a frequency domain resource, and a transmission power occupied by the first reference signal.

With reference to the fifth aspect, in a possible implementation manner of the fifth aspect, the format of the DCI is DCI format 0_0 or DCI format 0_ 1.

With regard to the technical effects of the fifth aspect or of various possible embodiments of the fifth aspect, reference may be made to the introduction to the technical effects of the respective embodiments of the first aspect or of the first aspect.

In a sixth aspect, a fourth communication device is provided, for example, the fourth communication device as described above. The communication device comprises a processor and a transceiver coupled to each other for implementing the method as described in the second aspect or in the various possible designs of the second aspect. Illustratively, the communication means is a chip provided in the communication device. Illustratively, the communication device is a terminal device. Wherein, the transceiver is implemented by an antenna, a feeder, a codec, etc. in the communication device, for example, or, if the communication device is a chip disposed in the communication device, the transceiver is, for example, a communication interface in the chip, and the communication interface is connected with a radio frequency transceiving component in the communication device to implement transceiving of information by the radio frequency transceiving component. Wherein the content of the first and second substances,

the transceiver is used for receiving DCI, and the DCI is only used for indicating terminal equipment to transmit a first reference signal;

the processor is configured to determine that the DCI only instructs a terminal device to transmit a first reference signal;

the transceiver is further configured to transmit the first reference signal according to the DCI.

With reference to the sixth aspect, in a possible implementation manner of the sixth aspect, the DCI is not used for scheduling data.

With reference to the sixth aspect, in one possible implementation of the sixth aspect, the DCI includes a first field; wherein the content of the first and second substances,

With reference to the sixth aspect, in a possible implementation manner of the sixth aspect, the first field is an MCS field.

With reference to the sixth aspect, in a possible implementation manner of the sixth aspect, the first range includes at least two of the following values: 11100, 11101, 11110, or 11111.

With reference to the sixth aspect, in one possible embodiment of the sixth aspect, the first value is 11100, 11101, 11110, or 11111.

With reference to the sixth aspect, in a possible implementation manner of the sixth aspect, different values of the first field correspond to different initial phase determination manners, and the processor is configured to determine, according to the value of the first field, a manner for determining an initial phase of a sequence of the first reference signal carried on a time domain symbol in which the first reference signal is sent.

With reference to the sixth aspect, in a possible implementation manner of the sixth aspect, the first reference signal is carried in at least two time slots, and initial phases of sequences of the first reference signal carried by the at least two time slots are the same or different.

With reference to the sixth aspect, in a possible implementation manner of the sixth aspect, the initial phases of the sequences of the first reference signals carried by the at least two timeslots are the same, and the determining includes: determining an initial phase of a sequence of the first reference signal in the at least two slots according to an index of a first slot of the at least two slots and an index of a first time domain symbol in the first slot, the first slot being a predefined slot of the at least two slots.

With reference to the sixth aspect, in a possible implementation manner of the sixth aspect, the initial phases of the sequences of the first reference signals carried by the at least two timeslots are different, and the determining manner includes: determining an initial phase of a sequence of the first reference signal in the first slot according to an index of a first slot of the at least two slots and an index of a first time domain symbol in the first slot.

With reference to the sixth aspect, in a possible implementation manner of the sixth aspect, the processor is further configured to perform one or any combination of the following:

With reference to the sixth aspect, in a possible implementation manner of the sixth aspect, the transceiver is further configured to receive an RRC signaling from the network device, and determine one or more of a time domain resource, a frequency domain resource, and a transmission power occupied by the first reference signal according to the RRC signaling.

With reference to the sixth aspect, in a possible implementation manner of the sixth aspect, the DCI format is DCI format 0_0 or DCI format 0_ 1.

With regard to the technical effects of the sixth aspect or of various possible embodiments of the sixth aspect, reference may be made to the introduction to the technical effects of the second aspect or of the respective embodiments of the second aspect.

In a seventh aspect, a fifth communication device is provided. The communication device may be the first communication device in the above method design. Illustratively, the communication means is a chip provided in the communication device. Illustratively, the communication device is a network device. The communication device includes: a memory for storing computer executable program code; and a processor coupled with the memory. Wherein the program code stored by the memory comprises instructions that, when executed by the processor, cause the fifth communication device to perform the method of the first aspect or any one of the possible implementations of the first aspect.

Wherein, the fifth communication device may further include a communication interface, which may be a transceiver in the network device, for example, implemented by an antenna, a feeder, a codec, etc. in the communication device, or, if the fifth communication device is a chip disposed in the network device, the communication interface may be an input/output interface of the chip, for example, an input/output pin, etc.

In an eighth aspect, a sixth communications apparatus is provided. The communication device may be the second communication device in the above method design. Illustratively, the communication means is a chip provided in the communication device. Illustratively, the communication device is a terminal device. The communication device includes: a memory for storing computer executable program code; and a processor coupled with the memory. Wherein the program code stored by the memory comprises instructions which, when executed by the processor, cause the sixth communication device to perform the method of the second aspect or any one of the possible embodiments of the second aspect.

Wherein the sixth communication means may further comprise a communication interface, which may be a transceiver in the terminal device, for example, implemented by an antenna, a feeder, a codec, etc. in the communication means, or, if the sixth communication means is a chip provided in the terminal device, the communication interface may be an input/output interface of the chip, for example, an input/output pin, etc.

A ninth aspect provides a communication system, which may include the first communication apparatus of the third aspect, the third communication apparatus of the fifth aspect, or the fifth communication apparatus of the seventh aspect, and include the second communication apparatus of the fourth aspect, the fourth communication apparatus of the sixth aspect, or the sixth communication apparatus of the eighth aspect.

A tenth aspect provides a computer storage medium having stored therein instructions that, when executed on a computer, cause the computer to perform the method of the first aspect or any one of the possible designs of the first aspect.

In an eleventh aspect, there is provided a computer storage medium having instructions stored thereon, which when run on a computer, cause the computer to perform the method as set forth in the second aspect or any one of the possible designs of the second aspect.

In a twelfth aspect, there is provided a computer program product comprising instructions stored thereon, which when run on a computer, cause the computer to perform the method of the first aspect or any one of the possible designs of the first aspect.

In a thirteenth aspect, there is provided a computer program product comprising instructions stored thereon, which when run on a computer, cause the computer to perform the method of the second aspect described above or any one of the possible designs of the second aspect.

In the embodiment of the application, the first reference signal does not need to be sent together with data, and then when the network device has a requirement, the terminal device can send the first reference signal to the network device independently, so that the flexibility of sending the first reference signal is improved. Because the first reference signal is sent more flexibly, the terminal device can send the first reference signal to the network device for multiple times, and the network device can also receive the first reference signal from the terminal device for multiple times, so that the accuracy of the network device in channel estimation on the terminal device is improved by enhancing the coverage of the first reference signal.

Drawings

Fig. 1 is a diagram illustrating that a terminal device occupies one OFDM symbol in one slot to transmit a DMRS;

fig. 2 is a schematic view of an application scenario according to an embodiment of the present application;

fig. 3 is a flowchart of a communication method according to an embodiment of the present application;

fig. 4 is a schematic diagram of DMRS sequences carried by two slots;

fig. 5 is a schematic diagram illustrating that the sequences of first reference signals carried by one timeslot are the same in the embodiment of the present application;

fig. 6 is a schematic diagram illustrating that the sequences of first reference signals carried by multiple timeslots are the same in the embodiment of the present application;

fig. 7 is a schematic diagram of a terminal device making a decision according to DCI in the embodiment of the present application;

fig. 8 is a schematic diagram of a terminal device transmitting a PUSCH or a first reference signal according to DCI scheduling in an embodiment of the present application;

fig. 9 is a schematic block diagram of a terminal device provided in an embodiment of the present application;

fig. 10 is another schematic block diagram of a terminal device provided in an embodiment of the present application;

fig. 11 is a schematic block diagram of a network device provided in an embodiment of the present application;

fig. 12 is another schematic block diagram of a network device provided by an embodiment of the present application;

fig. 13 is a schematic block diagram of a communication device provided in an embodiment of the present application;

fig. 14 is another schematic block diagram of a communication device provided by an embodiment of the present application;

fig. 15 is a further schematic block diagram of a communication device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

1) Terminal equipment, including devices that provide voice and/or data connectivity to a user, may include, for example, handheld devices with wireless connection capability or processing devices connected to wireless modems. The terminal device may communicate with a core network via a Radio Access Network (RAN), exchanging voice and/or data with the RAN. The terminal device may include a User Equipment (UE), a wireless terminal device, a mobile terminal device, a device-to-device communication (D2D) terminal device, a vehicle-to-all (V2X) terminal device, a machine-to-machine/machine-type communication (M2M/MTC) terminal device, an internet of things (IoT) terminal device, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile station), a remote station (remote station), an access point (access point, AP), a remote terminal (remote), an access terminal (access terminal), a user terminal (user terminal), a user agent (user), or user equipment (user equipment). For example, mobile telephones (or so-called "cellular" telephones), computers with mobile terminal equipment, portable, pocket, hand-held, computer-included mobile devices, and the like may be included. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. Also included are constrained devices, such as devices that consume less power, or devices that have limited storage capabilities, or devices that have limited computing capabilities, etc. Examples of information sensing devices include bar codes, Radio Frequency Identification (RFID), sensors, Global Positioning Systems (GPS), laser scanners, and the like.

By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable equipment can also be called wearable smart device or intelligent wearable equipment etc. is the general term of using wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets, smart helmets, smart jewelry and the like for monitoring physical signs.

The various terminal devices described above, if located on a vehicle (e.g., placed in or installed in the vehicle), may be considered to be vehicle-mounted terminal devices, which are also referred to as on-board units (OBUs), for example.

2) Network equipment, for example, including Access Network (AN) equipment, such as a base station (e.g., AN access point), may refer to equipment in AN access network that communicates with wireless terminal equipment over one or more cells over AN air interface, or access network equipment in one type of V2X technology is a Road Side Unit (RSU), for example. The base station may be configured to interconvert received air frames and Internet Protocol (IP) packets as a router between the terminal device and the rest of the access network, which may include an IP network. The RSU may be a fixed infrastructure entity supporting the V2X application and may exchange messages with other entities supporting the V2X application. The access network device may also coordinate attribute management for the air interface. For example, the access network device may include an evolved Node B (NodeB or eNB or e-NodeB) in a Long Term Evolution (LTE) system or an advanced long term evolution (LTE-a) system, or may also include a next generation Node B (gNB) in a fifth generation mobile communication technology (5G) NR system, or may also include a Centralized Unit (CU) and a Distributed Unit (DU) in a Cloud access network (Cloud RAN) system, which is not limited in the embodiments of the present application.

Of course, the network device may also include a core network device, but since the technical solution provided in the embodiment of the present application mainly relates to an access network device, hereinafter, unless otherwise specified, the "network device" described hereinafter refers to the access network device.

3) "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

And, unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing a plurality of objects, and do not limit the sequence, timing, priority, or importance of the plurality of objects. For example, the first information and the second information are only for distinguishing different signaling, and do not indicate the difference in content, priority, transmission order, importance, or the like of the two information.

Having described some of the concepts related to the embodiments of the present application, the following describes features of the embodiments of the present application.

In a wireless communication system, such as an NR communication system, information exchanged between a terminal device and a base station is carried over a physical channel. Uplink data sent by the terminal device is usually carried through a PUSCH; the uplink control information sent by the terminal device is usually carried through the PUCCH. In addition, the terminal device may also transmit a reference signal, and the base station may estimate channel responses or channel qualities of the terminal device on different frequencies by receiving the reference signal from the terminal device.

In wireless communication, for some deep coverage scenarios, such as cell edge, basement, etc., the path loss of wireless signal propagation is very severe. In this case, coverage enhancement means need to be considered, which is particularly important for uplink transmission. Since the transmission power of the terminal device is often low, for example 23dBm, which is much lower than the transmission power of the base station (for example, a base station with a bandwidth of 20MHz and a typical transmission power of 46dBm), this will result in a very weak signal transmitted by the terminal device in a deep coverage scenario reaching the base station. The base station estimates the uplink channel of the terminal device according to the reference signal from the terminal device, and if the base station cannot receive the reference signal from the terminal device or the received reference signal from the terminal device has weak strength, the channel estimation result of the base station may be inaccurate. If the channel estimation result of the base station is inaccurate, the demodulation of the uplink data from the terminal equipment by the base station is seriously affected, so that the base station is likely to fail to correctly receive the data signal sent by the terminal equipment.

In the NR system, a base station mainly receives a demodulation reference signal (DMRS) from a terminal device to perform channel estimation on an uplink channel of the terminal device. Taking an example that a terminal device sends a PUSCH in one slot (slot), generally, one slot includes 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the terminal device may send the DMRS on 1 to 4 OFDM symbols of the slot, and send uplink data on the remaining OFDM symbols. Here, at most, the terminal device may occupy 4 OFDM symbols of one slot to transmit the DMRS, and as to which OFDM symbols are occupied, specific provisions are currently made.

For example, referring to fig. 1, a schematic diagram of transmitting DMRS for one OFDM symbol in one slot occupied by a terminal device is shown. First, the base station schedules the terminal apparatus by Downlink Control Information (DCI), and the terminal apparatus receives the DCI and then transmits a PUSCH to the base station. It can be seen that the terminal device occupies the 3 rd OFDM symbol in one slot to transmit DMRS, that is, the OFDM symbol represented by the hatched area in fig. 1, and the other OFDM symbols in the slot are all used to transmit uplink data.

In one scheduling performed by the base station, from the time domain, the terminal device may be scheduled to transmit in one time slot, or may be scheduled to transmit in multiple consecutive time slots. In one time slot, the terminal device may be scheduled to transmit using all OFDM symbols, or may be scheduled to transmit using a part of OFDM symbols therein, and fig. 1 illustrates an example in which the terminal device is scheduled to transmit using all OFDM symbols in one time slot. Specifically, which OFDM symbols the terminal device transmits the DMRS in depends on the configuration of the terminal device by the base station.

In the NR system, the format (format) of DCI that schedules a terminal device to transmit PUSCH mainly includes DCI format 0_0 and DCI format 0_ 1. Taking DCI format 0_0 as an example, the DCI of DCI format 0_0 includes fields that can refer to table 1:

TABLE 1

In addition, there are other data scheduling methods in the NR system in addition to the scheduling by DCI. For example, the base station may configure a transmission resource for the terminal device through Radio Resource Control (RRC) signaling without performing scheduling through DCI (configured grant) or a method called grant free, and then, if the terminal device needs to transmit uplink data, the terminal device may transmit the uplink data according to the resource configured by the RRC signaling, without the base station scheduling the terminal device through DCI.

However, in both transmission by DCI dynamic scheduling and transmission by configuration grant, the terminal device needs to transmit uplink data together with DMRS when transmitting DMRS. Then, the terminal device can only transmit the reference signal when there is uplink data transmission. Generally, uplink data sent by the terminal device to the base station is not too much, so that the base station cannot obtain more reference signals. In a deep coverage scenario, a signal sent by the terminal device is likely to be very weak when reaching the base station, and at this time, the base station estimates an uplink channel of the terminal device according to fewer reference signals, which is likely to make an estimation result inaccurate. If the estimation of the base station on the uplink channel of the terminal device is not accurate enough, the demodulation of the uplink data and the like may be affected, so that the terminal device may not correctly obtain the uplink data sent by the terminal device. Therefore, how to improve the accuracy of uplink channel estimation of the base station to the terminal device is a problem that needs to be solved at present.

In view of this, the technical solutions of the embodiments of the present application are provided. In this embodiment of the application, the network device may only transmit the first reference signal through the DCI indication, and the terminal device may only transmit the first reference signal to the network device after receiving the DCI, so that the first reference signal does not need to be transmitted together with the data. Because the first reference signal is sent more flexibly, the terminal device can send the first reference signal to the network device for multiple times, the network device can also receive the first reference signal from the terminal device for multiple times, the network device estimates the uplink channel of the terminal device according to more first reference signals, and the accuracy of channel estimation is improved. Therefore, the embodiment of the application enhances the communication performance of the terminal equipment under deep coverage by improving the accuracy of the network equipment for channel estimation of the terminal equipment.

The technical solution provided in the embodiment of the present application may be applied to a fourth generation mobile communication technology (4G) 4G system, such as an LTE system, or may be applied to a 5G system, such as an NR system, or may also be applied to a next generation mobile communication system or other similar communication systems, which is not limited specifically.

A network architecture applied in the embodiment of the present application is described below, please refer to fig. 2.

Fig. 2 includes a network device and a terminal device, and the terminal device is connected to one network device. Of course, the number of terminal devices in fig. 2 is only an example, and in practical applications, the network device may provide services for a plurality of terminal devices. The network device in fig. 2, and each of a part of the plurality of terminal devices or all of the plurality of terminal devices may implement the technical solution provided by the embodiment of the present application. In addition, the terminal device in fig. 2 is a mobile phone as an example, but is not limited to this in practical application.

The network device in fig. 2 is, for example, an access network device, such as a base station, or may also be a device such as an RSU. The base station may correspond to different devices in different systems, for example, the base station may correspond to an eNB in a 4G system, and may correspond to a gNB in a 5G system. Of course, the technical solution provided in the embodiment of the present application may also be applied to a future mobile communication system, and therefore, the network device in fig. 2 may also correspond to an access network device in the future mobile communication system.

The technical scheme provided by the embodiment of the application is described below with reference to the accompanying drawings.

The embodiment of the present application provides a first communication method, please refer to fig. 3, which is a flowchart of the method. In the following description, the method is applied to the network architecture shown in fig. 2 as an example. In addition, the method may be performed by two communication apparatuses, for example, a first communication apparatus and a second communication apparatus, where the first communication apparatus may be a network device or a communication apparatus capable of supporting the network device to implement the functions required by the method, or the first communication apparatus may be a terminal device or a communication apparatus capable of supporting the terminal device to implement the functions required by the method, and may of course be other communication apparatuses such as a system on chip. The same applies to the second communication apparatus, which may be a network device or a communication apparatus capable of supporting the network device to implement the functions required by the method, or a terminal device or a communication apparatus capable of supporting the terminal device to implement the functions required by the method, and of course, other communication apparatuses such as a system on a chip may also be used. The implementation manners of the first communication device and the second communication device are not limited, for example, the first communication device may be a network device, the second communication device is a terminal device, or both the first communication device and the second communication device are network devices, or both the first communication device and the second communication device are terminal devices, or the first communication device is a network device, and the second communication device is a communication device capable of supporting the terminal device to implement the functions required by the method, and so on. The network device is, for example, a base station.

For convenience of introduction, in the following, the method is performed by a network device and a terminal device as an example, that is, the first communication apparatus is a network device and the second communication apparatus is a terminal device as an example. Since the present embodiment is applied to the network architecture shown in fig. 3 as an example, the network device described below may be a network device in the network architecture shown in fig. 2, and the terminal device described below may be a terminal device in the network architecture shown in fig. 2.

S31, the network equipment determines DCI, and the DCI is only used for indicating the terminal equipment to send the first reference signal.

The first reference signal may be a DMRS, or the DMRS may also have another name, or the first reference signal may also be another reference signal, for example, a Sounding Reference Signal (SRS), and the like.

In addition, in the embodiment of the present application, the DCI is only used to instruct the terminal device to transmit the first reference signal, and it may also be described that the DCI is used to instruct the terminal device to transmit the first reference signal independently of the uplink data, or the transmission of the first reference signal is unrelated to the transmission of the uplink data. That is, the DCI is used only for scheduling the first reference signal and is not used for scheduling uplink data.

As an optional implementation manner of the DCI, in this embodiment of the present application, the DCI may be a DCI dedicated to schedule the first reference signal. It can be understood that the format of the DCI is designed in the embodiment of the present application, for example, referred to as a first format, and as long as the network device transmits the DCI in the first format, the DCI is only used to instruct the terminal device to transmit the first reference signal. In this case, after receiving the DCI, the terminal device does not need to perform operations such as excessive parsing on the DCI, and only needs to recognize that the DCI format is the first format, and thus it can be determined that the DCI is only used for instructing the terminal device to transmit the first reference signal, which is relatively simple.

For example, the network device may indicate/configure a first Radio Network Temporary Identity (RNTI) for the terminal device, and the network device may scramble a Cyclic Redundancy Check (CRC) of the DCI in the first format using the first RNTI, and then the network device may transmit the scrambled DCI in the first format. When the terminal device receives a piece of DCI and passes the CRC check of the DCI using the first RNTI, the terminal device may determine that the received DCI is the DCI of the first format, and thus may further determine that the first reference signal needs to be transmitted according to the DCI of the first format.

As another optional implementation of DCI, in the embodiment of the present application, the DCI may also multiplex an existing DCI. In the current NR system, the DCI format used for scheduling the terminal device to perform uplink transmission mainly includes DCI format 0_0 and DCI format 0_1, for example, the DCI in the embodiment of the present application may use DCI of DCI format 0_0 or DCI of DCI format 0_ 1. Or the DCI in the embodiment of the present application may also multiplex currently existing DCIs of other formats, which is not limited specifically.

For example, the DCI may instruct only the terminal device to transmit the first reference signal by a value of the first field. For example, when the value of the first field is the first value, the DCI is only used to instruct the terminal device to transmit the first reference signal, or when the value of the first field belongs to the first range, the DCI is only used to instruct the terminal device to transmit the first reference signal. The first field may be, for example, a Modulation and Coding Scheme (MCS) field in the DCI, or may be another field in the DCI, and the MCS field is taken as an example below.

The DCI in the embodiment of the present application uses DCI of DCI format 0_0 or DCI of DCI format 0_1 as an example. Whether DCI of DCI format 0_0 or DCI of DCI format 0_1, the MCS field is included therein. In DCI, the length of the MCS field is 5 bits (bit), and the 5 bits may be "00000", "00001", "00010", … … "," 11110 "," 11111 ". The 5 bits can have 32 values at most, namely 32 states at most. According to the configuration of some RRC signaling, the terminal device may use 29 states "00000" to "11100" to indicate different combinations of modulation orders and coding rates, or may use 28 states "00000" to "11011" to indicate different combinations of modulation orders and coding rates.

Take the example of using 28 states "00000" to "11011" of the MCS field to indicate different modulation order and coding rate combinations. The terminal device may determine, according to the state of 5 bits in the MCS field included in the received DCI, the modulation order and the coding rate corresponding to the state by looking up table 2.

TABLE 2

For example, when the status of 5 bits indicated by the MCS field is 2 (i.e., 5 bits are 00010), the corresponding modulation order is 2 and the coding rate is 193/1024, as can be seen from table lookup 2.

It can be seen that in table 2, there are several invalid states, for example, the 4 states 28-31 labeled "reserved" in table 2 (i.e., 11100, 11101, 11110, and 11111 for 5 bits) are invalid states. And 11100, 11101, 11110, 11111, and these 4 values may be referred to as reserved values, or as reserved states or invalid states, which may be understood as values or states that are not used to indicate MCS.

Table 2 is an example in which 28 states of "00000" to "11011" using the MCS field indicate different combinations of modulation orders and coding rates, and if 29 states of "00000" to "11100" using the MCS field indicate different combinations of modulation orders and coding rates, there are 3 invalid states, that is, 3 states of 11101, 11110, and 11111 corresponding to 5 bits are invalid. And 11101, 11110, 11111, these 3 values may all be referred to as reserved values.

Accordingly, embodiments of the present application contemplate that these reserved values of the MCS field may be utilized such that the DCI only instructs the terminal device to transmit the first reference signal. For example, if the DCI only indicates that the terminal device transmits the first reference signal by taking the value of the first field as the first value, the first value may be a 5-bit value corresponding to an unused state (invalid state) in the MCS field, or the first value may be one of the reserved values in the MCS field. As can be seen from the foregoing description, the reserved value of the MCS field may include one of the following or any combination thereof: 11100. 11101, 11110 or 11111, the first value may be one of them. For example, if the 28 states of "00000" to "11011" of the MCS field indicate different modulation order and coding rate combinations, the reserved value includes one or more of 11100, 11101, 11110, or 11111; alternatively, if 29 states of "00000" to "11100" of the MCS field indicate different modulation order and coding rate combinations, the reserved value includes one or more of 11101, 11110, or 11111.

For example, if the 28 states of "00000" to "11011" using the MCS field indicate different modulation orders and coding rate combinations, the first value may be "11100", "11101", "11110", or "11111"; alternatively, if 29 states of "00000" to "11100" using the MCS field indicate different modulation order and coding rate combinations, the first value may be "11101", "11110", or "11111". For example, if the first value is "11111", if the MCS field included in the DCI takes a value of "11111", it indicates that the DCI is only used to indicate transmission of the first reference signal.

Take the example that the first field is the MCS field. The value of the MCS field is the first value, so that the DCI only indicates the terminal equipment to send the first reference signal, the invalid state of the MCS field is utilized to achieve the purpose of indicating the terminal equipment to send the first reference signal, the utilization rate of the field state is improved, no field is added in the DCI, and the DCI demodulation performance reduction caused by the addition of the DCI load is avoided.

Or the DCI only instructs the terminal device to transmit the first reference signal by making the value of the first field belong to a first range, the first range may include values corresponding to one or more unused states (invalid states) in the MCS field, or the first range may include one or more reserved values of the MCS field. For example, if the 28 states of "00000" to "11011" using the MCS field indicate different modulation orders and coding rate combinations, the first range may include one or more of "11100", "11101", "11110", or "11111"; alternatively, if 29 states of "00000" to "11100" of the MCS field indicate different modulation orders and coding rate combinations, the first range may include one or more of "11101", "11110", or "11111". For example, if the first range includes "11101", "11110" and "11111", then if the value of the MCS field included in the DCI is any one of "11101", "11110" or "11111", it indicates that the DCI is only used to indicate that the first reference signal is transmitted.

Take the example that the first field is the MCS field. The value of the MCS field belongs to the first range to enable the DCI to only indicate the terminal equipment to send the first reference signal, the invalid state of the MCS field can be utilized, and the MCS field can take a plurality of values to enable the DCI to only indicate the terminal equipment to send the first reference signal, so that the mode is flexible.

Of course, the first field may not multiplex the MCS field, but multiplex other fields in the DCI, and then the first value may correspond to the value of the other fields, or the first range may correspond to the range formed by the values of the other fields. Or, the first field may also be a field added in the multiplexed existing DCI, and is not limited specifically, for example, a 1-bit field may be added in DCI format 0_0 or DCI format 0_1, where a value of the 1 bit is 0 or 1 to distinguish whether the DCI schedules PUSCH transmission or first reference signal transmission.

Generally, the network device does not need to modulate or encode or decode the reference signal sent by the terminal device, and therefore the MCS field generally has no practical indication meaning for sending the reference signal, and therefore, the embodiment of the present application multiplexes the invalid state indication in the MCS field to only send the first reference signal, which not only improves the utilization rate of the field state, but also ensures that the use of the invalid state of the MCS field does not cause errors in modulation and coding.

In addition, currently in the NR system, the DMRS transmitted by the terminal device may be generated by a Gold sequence, and when a polynomial of the Gold sequence used to generate the DMRS is fixed, a specific DMRS sequence is determined by an initial phase C_initAnd (4) determining. For the transmission of PUSCH, a DMRS sequence carried by a certain OFDM symbol in a certain slot is determined according to an index (index) of the slot in a radio frame and an index of the OFDM symbol in the slot. In particular, the initial phase C of the DMRS sequence_initCan be determined by equation 1:

wherein the content of the first and second substances,

is the index of the time slot in which the DMRS is positioned in a radio frame, l is the index of the OFDM symbol in which the DMRS is positioned in the time slot,

number of time domain symbols included for one slot, n_SCIDParameters configured for higher layers, for example taking values of 0 or 1,

configured for higher layersParameters, for example, take values between 0 and 65535, mod representing the modulo operation. In the embodiment of the present application, the time domain symbol is an OFDM symbol as an example. It can be seen that the initial phase of the DMRS sequence is determined by an index of a slot in which the DMRS is located in one radio frame, and an index of an OFDM symbol in which the DMRS is located in the slot. This also means that the DMRS sequences carried in different slots or different OFDM symbols are different.

Referring to fig. 4, a diagram of DMRS sequences carried by two slots is shown. In both slot 0 and slot 1, DMRS sequences are carried by OFDM symbol 3 and OFDM symbol 10, in fig. 4, OFDM symbol 3 of slot 0 is filled with a vertical line, OFDM symbol 10 of slot 0 is filled with "/", OFDM symbol 3 of slot 1 is filled with "\\", and OFDM symbol 10 of slot 1 is filled with a horizontal line. Through different filling manners of the 4 OFDM symbols, it is indicated that DMRS sequences carried by the 4 OFDM symbols are different.

If the DMRS sequences carried by different OFDM symbols are different, the network device may not simply combine the DMRS sequences carried by different OFDM symbols when performing channel estimation according to the DMRS, but may only perform channel estimation according to the DMRS sequence carried by each OFDM symbol, and then combine the results of each channel estimation, which may result in noise amplification and is not favorable for noise cancellation. In view of this, the embodiments of the present application provide that the sequences of the first reference signals carried by different time domain symbols may be the same. For example, the sequences of the first reference signals carried by the time domain symbols included in one time slot may be the same, or the sequences of the first reference signals carried by the time domain symbols included in a plurality of time slots may be the same. If the sequences of the first reference signals carried by the two time domain symbols are the same and the channel between the terminal device and the network device changes slowly, the network device can combine the sequences of the first reference signals carried by the two time domain symbols and perform channel estimation according to the combined signals, which is helpful to reduce noise and improve the accuracy of channel estimation. In the embodiment of the present application, the time domain symbol may be an OFDM symbol.

Then, as an alternative implementation, the first value may indicate, in addition to only transmitting the first reference signal, a determination manner of an initial phase of a sequence of the first reference signal carried on each time domain symbol used for transmitting the first reference signal. Or, different values of the first field may correspond to different initial phase determination manners, and the determination manner of the initial phase of the sequence of the first reference signal carried on the time domain symbol in which the first reference signal is sent corresponds to the value of the first field. After receiving the DCI, the terminal device may determine, according to a value of the first field, a manner of determining an initial phase of a sequence of the first reference signal carried on a time domain symbol in which the first reference signal is transmitted.

In the embodiment of the present application, the first reference signal is carried in at least two time slots, and the initial phases of the sequences of the first reference signal carried by the at least two time slots are the same or different. Since the initial phases of the sequences are the same, the two sequences can be considered to be the same, and therefore, by making the initial phases of the sequences on different OFDM symbols the same, the sequences carried by different OFDM symbols can be made the same, and by making the initial phases of the sequences on different OFDM symbols different, the sequences carried by different OFDM symbols can be made different.

In this embodiment of the present application, the determining manner of the initial phase may include one of a first initial phase determining manner, a second initial phase determining manner, or a third initial phase determining manner.

1. First, an initial phase determination method.

If the initial phase of the sequence of the first reference signal carried on each time domain symbol used for transmitting the first reference signal is determined separately, the first initial phase determining manner may be to determine the initial phase of the sequence of the first reference signal carried on each time domain symbol according to an index of a time slot in which each time domain symbol used for transmitting the first reference signal is located in a radio frame and an index of the first time domain symbol in the time slot in which each time domain symbol is located. The first time domain symbol may be a predefined time domain symbol, for example, the first time domain symbol is predefined as a first time domain symbol in a time slot, or a last time domain symbol in the time slot, or a first time domain symbol in the time slot for carrying a sequence of the first reference signal, or may also be any one time domain symbol in the time slot, and so on, and may specifically be predefined by a protocol, or configured by a network device.

For example, the slot for transmitting the first reference signal includes slot 0 and slot 1, and the first reference signal is transmitted through OFDM symbol 3 and OFDM symbol 10 in both slot 0 and slot 1. Then in slot 0 the first OFDM symbol carrying the first reference signal is OFDM symbol 3 and in slot 1 the first OFDM symbol carrying the first reference signal is symbol 3. Then, the sequence of the first reference signal carried by the OFDM symbol 3 of the slot 0 may be determined according to the index (for example, the index is 0) of the slot 0 in the radio frame and the index (for example, the index is 3) of the OFDM symbol 3 in the slot 0, the sequence of the first reference signal carried by the OFDM symbol 10 of the slot 0 may be determined according to the index (for example, the index is 0) of the slot 0 in the radio frame and the index (for example, the index is 3) of the OFDM symbol 3 in the slot 0, the sequence of the first reference signal carried by the OFDM symbol 3 of the slot 1 may be determined according to the index (for example, the index is 1) of the slot 1 in the radio frame and the index (for example, the index is 3) of the OFDM symbol 3 in the slot 1, and the sequence of the first reference signal carried by the OFDM symbol 10 of the slot 1 may be determined according to the index (for example, the index is 1) of the slot 1, And the index of OFDM symbol 3 in slot 1 (e.g., index 3). It can be seen that the initial phase of the sequence of the first reference signal carried by the OFDM symbol 3 of the slot 0 and the initial phase of the sequence of the first reference signal carried by the OFDM symbol 10 of the slot 0 are determined in the same manner, the initial phase of the sequence of the first reference signal carried by the OFDM symbol 3 of the slot 1 and the initial phase of the sequence of the first reference signal carried by the OFDM symbol 10 of the slot 1 are determined in the same manner, which means that the initial phases of the sequences of the OFDM symbol 3 of the slot 0 and the first reference signal carried by the OFDM symbol 10 are the same, and the initial phases of the sequences of the OFDM symbol 3 of the slot 1 and the first reference signal carried by the OFDM symbol 10 are the same.

Reference may be made to fig. 5. In fig. 5, the OFDM symbol 3 and the OFDM symbol 10 of the slot 0 are filled with horizontal lines, and the OFDM symbol 3 and the OFDM symbol 10 of the slot 1 are filled with "/", which means that the initial phases of the sequences of the first reference signals carried by the OFDM symbol 3 and the OFDM symbol 10 of the slot 0 are the same, and the initial phases of the sequences of the first reference signals carried by the OFDM symbol 3 and the OFDM symbol 10 of the slot 1 are the same.

It can be seen that in the first initial phase determination mode, the sequences of the first reference signals carried by the time domain symbols in one slot are the same. As used herein, a time domain symbol in a slot refers to a time domain symbol used for carrying a first reference signal in the slot, and the number of time domain symbols used for carrying the first reference signal in a slot may be one or more. It is also possible, whether for the network device or the terminal device, to determine not the initial phase of the sequence of first reference signals carried on each time domain symbol used for transmitting the first reference signals, respectively, but the initial phase of the sequence of first reference signals carried on each time slot used for transmitting the first reference signals. That is, for each time slot used for transmitting the first reference signal, the initial phase of the sequence of the first reference signal carried by each time domain symbol in one time slot may only need to be determined once, because the initial phases of the sequences of the first reference signals carried by each time domain symbol in one time slot are all the same, the initial phase of the sequence of the first reference signal only needs to be determined for one time slot. If this is the case, the first initial phase determination may also be described as determining the initial phase of the sequence of the first reference signal in the first slot based on the index of the first slot of the at least two slots and the index of the first time domain symbol in the first slot.

The first time domain symbol may be a predefined time domain symbol, for example, the first time domain symbol is predefined as a first time domain symbol in a time slot, or a last time domain symbol in the time slot, or a first time domain symbol in the time slot for carrying a sequence of the first reference signal, or may also be any one time domain symbol in the time slot, and so on, and may specifically be predefined by a protocol, or configured by a network device. Since the "first slot" in the first initial phase determination mode may be any one of at least two slots, the first time domain symbol may not be "predefined" for a certain slot, but may be applicable for all slots. For example, the first time domain symbol is the first time domain symbol in a slot, then if the first slot is slot 0, the first time domain symbol is the first time domain symbol in slot 0, and if the first slot is slot 1, the first time domain symbol is the first time domain symbol in slot 1.

For example, if the slot used for transmitting the first reference signal includes slot 0 and slot 1, the initial phase of the sequence of the first reference signal carried in slot 0 may be determined according to the index of slot 0 in the radio frame and the index of the first time domain symbol in slot 0. And the initial phase of the sequence of the first reference signal carried by slot 0, that is, the initial phase of the sequence of the first reference signal carried by each time domain symbol of the sequence for carrying the first reference signal in slot 0. The initial phase of the sequence of the first reference signal carried by slot 1 may be determined according to the index of slot 1 in the radio frame and the index of the first time domain symbol in slot 1. And the initial phase of the sequence of the first reference signal carried by the time slot 1, that is, the initial phase of the sequence of the first reference signal carried by each time domain symbol of the sequence for carrying the first reference signal in the time slot 1. With continued reference to fig. 5, in fig. 5, the initial phase of the sequence of the first reference signal carried by OFDM symbol 10 and OFDM symbol 3 of slot 0 is the same, and the initial phase of the sequence of the first reference signal carried by OFDM symbol 10 and OFDM symbol 3 of slot 1 is the same.

Therefore, if the first initial phase determination method is adopted, the sequences of the first reference signals carried by the OFDM symbols in one slot can be made identical. The network device may combine the sequences of the first reference signals carried by the two OFDM symbols of the time slot 0, perform channel estimation according to the combined signals, combine the sequences of the first reference signals carried by the two OFDM symbols of the time slot 1, perform channel estimation according to the combined signals, and combine the two channel estimation results. The channel estimation mode is beneficial to reducing noise and improving the accuracy of channel estimation.

2. Second initial phase determination.

If the initial phase of the sequence of the first reference signal carried on each time domain symbol used for transmitting the first reference signal is determined separately, the second initial phase determination manner may be that the initial phase of the sequence of the first reference signal carried on each time domain symbol used for transmitting the first reference signal is determined according to an index of a slot in which the first time domain symbol carrying the first reference signal is located in a radio frame and an index of the slot in which the first time domain symbol carrying the first reference signal is located. The first time domain symbol may be a predefined time domain symbol, for example, the first time domain symbol is predefined as a first time domain symbol carrying the first reference signal, or as a last time domain symbol carrying the first reference signal, or as another time domain symbol except the first time domain symbol and the last time domain symbol carrying the first reference signal, and the like, and may specifically be predefined by a protocol, or configured by a network device.

For example, the slot for transmitting the first reference signal includes slot 0 and slot 1, and the first reference signal is transmitted through OFDM symbol 3 and OFDM symbol 10 in both slot 0 and slot 1. Then in slot 0 and slot 1, the first OFDM symbol carrying the first reference signal is OFDM symbol 3 of slot 0. Then, the sequence of the first reference signal carried by the OFDM symbol 3 of the slot 0 may be determined according to the index (for example, the index is 0) of the slot 0 in the radio frame and the index (for example, the index is 3) of the OFDM symbol 3 in the slot 0, the sequence of the first reference signal carried by the OFDM symbol 10 of the slot 0 may be determined according to the index (for example, the index is 0) of the slot 0 in the radio frame and the index (for example, the index is 3) of the OFDM symbol 3 in the slot 0, the sequence of the first reference signal carried by the OFDM symbol 3 of the slot 1 may be determined according to the index (for example, the index is 0) of the slot 0 in the radio frame and the index (for example, the index is 3) of the OFDM symbol 3 in the slot 0, and the sequence of the first reference signal carried by the OFDM symbol 10 of the slot 1 may be determined according to the index (for example, the index is 0) of the slot 0, And the index of OFDM symbol 3 in slot 0 (e.g., index 3). It can be seen that the initial phase of the sequence of the first reference signal carried by the OFDM symbol 3 of the slot 0, the initial phase of the sequence of the first reference signal carried by the OFDM symbol 10 of the slot 0, the initial phase of the sequence of the first reference signal carried by the OFDM symbol 3 of the slot 1, and the initial phase of the sequence of the first reference signal carried by the OFDM symbol 10 of the slot 1 are determined in the same manner, which means that the initial phase of the sequence of the first reference signal carried by the OFDM symbol 3 of the slot 0, the initial phase of the sequence of the first reference signal carried by the OFDM symbol 10 of the slot 0, the initial phase of the sequence of the first reference signal carried by the OFDM symbol 3 of the slot 1, and the initial phase of the sequence of the first reference signal carried by the OFDM symbol 10 of the slot 1 are all the same.

Reference may be made to fig. 6. In fig. 6, OFDM symbol 3 of slot 0, OFDM symbol 10 of slot 0, OFDM symbol 3 of slot 1 and OFDM symbol 10 of slot 1 are all filled with "/", which means that the initial phases of the sequences of the first reference signal carried by OFDM symbol 3 of slot 0, OFDM symbol 10 of slot 0, OFDM symbol 3 of slot 1 and OFDM symbol 10 of slot 1 are all the same.

It can be seen that in the second initial phase determination mode, the sequences of the first reference signal carried by the time domain symbols in at least two slots used for transmitting the first reference signal are all the same. As used herein, the time domain symbols in the at least two slots refer to the time domain symbols in the at least two slots for carrying the first reference signal, and the number of the time domain symbols in the at least two slots for carrying the first reference signal may be one or more. It is also possible, whether for the network device or the terminal device, to determine the initial phase of the sequence of first reference signals carried on each time domain symbol used for transmitting the first reference signals, respectively, but to determine the initial phase of the sequence of first reference signals carried on at least two time slots used for transmitting the first reference signals. That is, for at least two slots used for transmitting the first reference signal, the initial phase of the sequence of the first reference signal carried by each time domain symbol in the at least two slots may only need to be determined once, because the initial phase of the sequence of the first reference signal carried by each time domain symbol in the at least two slots is the same, the initial phase of the sequence of the first reference signal only needs to be determined uniformly for the at least two slots. If this is the case, the second initial phase determination manner can also be described as determining the initial phase of the sequence of the first reference signal in the at least two slots according to the index of the first slot of the at least two slots and the index of the first time domain symbol in the first slot, the first slot being a predefined slot of the at least two slots.

The first time slot may be a predefined time slot, for example, the first time slot is predefined as a first time slot of the at least two time slots, or as a last time slot of the at least two time slots, or as another time slot of the at least two time slots except for the first time slot and the last time slot, and the like, and may be specifically specified by a protocol or configured by a network device. The first time domain symbol may be a predefined time domain symbol, for example, the first time domain symbol is predefined as a first time domain symbol in the first time slot, or as a last time domain symbol in the first time slot, or as a first time domain symbol in the first time slot for carrying a sequence of the first reference signal, or may also be any one time domain symbol in the first time slot, and so on, and may specifically be predefined by a protocol, or configured by a network device.

For example, the slots for transmitting the first reference signal include slot 0 and slot 1, and the first slot is slot 0. The initial phase of the sequence of the first reference signal carried by slot 0 may be determined according to the index of slot 0 in the radio frame and the index of the first time domain symbol in slot 0. And the initial phase of the sequence of the first reference signal carried by slot 0, that is, the initial phase of the sequence of the first reference signal carried by each time domain symbol of the sequence for carrying the first reference signal in slot 0. The initial phase of the sequence of the first reference signal carried in slot 1 may be determined according to the index of slot 0 in the radio frame and the index of the first time domain symbol in slot 0. And the initial phase of the sequence of the first reference signal carried by the time slot 1, that is, the initial phase of the sequence of the first reference signal carried by each time domain symbol of the sequence for carrying the first reference signal in the time slot 1. In this regard, with continued reference to fig. 6, in fig. 6, the initial phase of the sequence of the first reference signal carried by OFDM symbol 3 of slot 0, OFDM symbol 10 of slot 0, OFDM symbol 3 of slot 1, and OFDM symbol 10 of slot 1 is the same.

Therefore, if the second initial phase determination method is adopted, the sequences of the first reference signals carried by the OFDM symbols where the first reference signals transmitted at one time are located can be made to be the same. The network device may combine the sequences of the first reference signals carried by the four OFDM symbols of the time slot 0 and the time slot 1, and then perform channel estimation according to the combined signals. The channel estimation mode is beneficial to reducing noise and improving the accuracy of channel estimation.

3. And a third initial phase determination mode.

A third initial phase determination method needs to determine an initial phase of a sequence of the first reference signal carried on each time domain symbol used for transmitting the first reference signal. The third initial phase determining method may be that the initial phase of the sequence of the first reference signal carried on each time domain symbol is determined according to an index of the time slot in which each time domain symbol for transmitting the first reference signal is located in the radio frame and an index of the time slot in which each time domain symbol is located.

For example, the slot for transmitting the first reference signal includes slot 0 and slot 1, and the first reference signal is transmitted through OFDM symbol 3 and OFDM symbol 10 in both slot 0 and slot 1. Then, the sequence of the first reference signal carried by the OFDM symbol 3 of the slot 0 may be determined according to the index (for example, the index is 0) of the slot 0 in the radio frame and the index (for example, the index is 3) of the OFDM symbol 3 in the slot 0, the sequence of the first reference signal carried by the OFDM symbol 10 of the slot 0 may be determined according to the index (for example, the index is 0) of the slot 0 in the radio frame and the index (for example, the index is 10) of the OFDM symbol 10 in the slot 0, the sequence of the first reference signal carried by the OFDM symbol 3 of the slot 1 may be determined according to the index (for example, the index is 1) of the slot 1 in the radio frame and the index (for example, the index is 3) of the OFDM symbol 3 in the slot 1, and the sequence of the first reference signal carried by the OFDM symbol 10 of the slot 1 may be determined according to the index (for example, the index is 1) of the slot 1, And the index of the OFDM symbol 10 in slot 1 (e.g., 10).

Reference may be made to fig. 4 for this. In fig. 4, the OFDM symbol 3 of slot 0 is filled with a vertical line, the OFDM symbol 10 of slot 0 is filled with "/", the OFDM symbol 3 of slot 1 is filled with "\\", and the OFDM symbol 10 of slot 1 is filled with a horizontal line. Through different filling modes of the 4 OFDM symbols, the sequences of the first reference signals carried by the 4 OFDM symbols are different from each other.

This approach is similar to the approach of determining the initial phase of the DMRS sequence according to equation 1 as described above, and the sequence of the first reference signal determined by this initial phase determination approach is different for the sequences of the first reference signals carried by different OFDM symbols.

For example, when the channel condition of the terminal device changes slowly (for example, when the moving speed of the terminal device is slow, the channel condition may change slowly), the first initial phase determining manner or the second initial phase determining manner may be used, so that the sequences of the first reference signals carried by the plurality of OFDM symbols are the same, and the network device may combine the sequences of the first reference signals carried by the plurality of OFDM symbols and then perform channel estimation uniformly, which is beneficial to reducing noise, and because the channel condition of the terminal device changes slowly, the accuracy of channel estimation is not substantially reduced. If the channel condition of the terminal device changes faster (for example, if the moving speed of the terminal device is faster, the channel condition may change faster), a third initial phase determination method may be used to make the sequences of the first reference signals carried by different OFDM symbols different, so that the network device may perform channel estimation for the sequence of the first reference signal carried by each OFDM symbol, respectively, to improve the accuracy of channel estimation. And by using the third initial phase determination mode, if the interference between the sequence of the first reference signal carried by one OFDM symbol and the other sequences transmitted by the neighboring cell is strong, but because the sequences of the first reference signals carried by different OFDM symbols are different, the interference between the sequence of the first reference signal carried by other OFDM symbols and the sequence transmitted by the neighboring cell may be reduced or eliminated, so that the interference of the terminal device to the neighboring cell can be randomized, the interference of the neighboring cell can be reduced, and the better cross-correlation performance with the reference signals of other terminal devices in the same cell can be ensured as much as possible.

If the value of the first field needs to indicate the determination manner of the initial phase in addition to the transmission of only the first reference signal, it is applicable to the case where the value of the first field belongs to the first range. For example, the first range may include a plurality of values, and the first field may indicate that only the first reference signal is transmitted through any one value of the first field, and may indicate a corresponding initial phase determination manner through a different value in the first range. Or, if the value of the first field indicates that only the first reference signal is transmitted and the determination manner of the initial phase needs to be indicated, the method may also be applied to a case where the value of the first field is the first value, that is, if the value of the first field is the first value, the determination manner of the initial phase may also be indicated in addition to indicating that only the first reference signal is transmitted. Of course, if the value of the first field is the first value, the value of the first field may also only indicate that only the first reference signal is transmitted, and is not used for indicating the determination manner of the initial phase, in this case, the DCI may not need to indicate the determination manner of the initial phase, the terminal device may determine the initial phase of the sequence of the first reference signal in an existing manner, or in this case, the determination manner of the initial phase may be predefined by a protocol or configured by the network device.

The value of the first field is used to indicate which initial phase determination method is as above, and may be configured by the network device, or specified by a protocol, etc. Alternatively, the first value may indicate one of the three determination manners, and may also indicate other determination manners, which is not limited specifically, as long as the indicated determination manner can determine the initial phase of the sequence of the first reference signal carried on each time domain symbol used for transmitting the first reference signal.

For example, the first value is 11111 to indicate the first initial phase determination method, the first value is 11110 to indicate the second initial phase determination method, and the first value is 11101 to indicate the third initial phase determination method. Of course, this is merely an example, and the embodiment of the present application is not limited to the correspondence between the first value and the corresponding initial phase determination manner.

Generally, if the first initial phase determination method or the second initial phase determination method is used, a plurality of consecutive sequences of the same first reference signal can be simply subjected to energy combination detection, and the method is suitable for a scene with slow moving speed and slow channel change of the terminal device. The sequences of different first reference signals cannot be simply and directly energy-combined, but interference of the terminal equipment to the neighboring cell can be randomized, and the first reference signals of other terminal equipment in the same cell can also have better cross-correlation performance. In the embodiment of the application, the network device can indicate the first reference signal more flexibly by using a determination mode of a sequence when the terminal device is indicated to only send the first reference signal by using a plurality of different invalid states, and the terminal device can be indicated to use a proper sending mode in the process of sending only the first reference signal according to actual needs.

S32, the network device sends the DCI to the terminal device, the terminal device receives the DCI from the network device, and the DCI is only used for indicating the terminal device to send the first reference signal.

And S33, the terminal equipment sends the first reference signal according to the DCI.

If the DCI is the DCI of the first format provided in the embodiment of the present application, after receiving the DCI, the terminal device may determine that the DCI is the DCI of the first format, and the DCI is only used for scheduling the first reference signal and is not used for scheduling the uplink data. The terminal device may send the first reference signal to the network device according to the DCI scheduling, and at this time, the first reference signal may be sent to the network device alone without being sent together with the uplink data.

Or, if the DCI is a DCI multiplexing an existing format, and the DCI only indicates the terminal device to transmit the first reference signal through the first field, after the terminal device receives the DCI, the terminal device may determine a value of the first field included in the DCI, and if the value of the first field is the first value or the value of the first field belongs to the first range, the terminal device may determine that the DCI is only used for scheduling the first reference signal and is not used for scheduling uplink data. The terminal device may send the first reference signal to the network device according to the DCI scheduling, and at this time, the first reference signal may be sent to the network device alone without being sent together with the uplink data.

Take the example that the first field is the MCS field. In this embodiment, when the terminal device receives the DCI, it needs to determine, according to a state of an MCS field (or a value of the MCS field) included in the DCI, whether to schedule the terminal device to perform ordinary PUSCH transmission or to schedule only the terminal device to perform transmission of the first reference signal. Taking DCI format 0_0, for example, by taking the value of the first field as the first value, so that the DCI only instructs the terminal device to transmit the first reference signal, where the first value is "11111" and the first reference signal is DMRS, the logical behavior of the terminal device may refer to fig. 7.

That is, after receiving the DCI in DCI format 0_0, the terminal device determines whether the DCI schedules the PUSCH normally or schedules the terminal device to transmit only the DMRS according to the value of the MCS field included in the DCI. Wherein, if one of the MCS fields belongs to one of 00000-11011, the terminal equipment determines that the PUSCH is normally transmitted; or if the value of the MCS field belongs to one of 11101-11110, the terminal equipment determines that the DCI is invalid; alternatively, if 11111 is one of the MCS fields, the terminal device determines to transmit only the DMRS. Here, the example is that 28 states of "00000" to "11011" using the MCS field indicate different modulation orders and coding rate combinations.

The embodiment of the application multiplexes invalid state indication in the MCS field and only transmits the first reference signal, thereby improving the utilization rate of the field state. Moreover, the reference signal is generally transmitted without modulation and coding, so the MCS field generally has no indication meaning for the transmission of the reference signal, and the use of the MCS field in the embodiment of the present application does not cause modulation and coding errors. In addition, the technical scheme of the embodiment of the application does not add extra bit number in the DCI, so that the demodulation performance of the DCI can be ensured as much as possible, and the complexity of a system can not be increased.

In addition, if the terminal device determines that the DCI only indicates transmission of the first reference signal, the terminal device may further determine at least one of a time domain resource, a frequency domain resource, or a transmission power of the first reference signal for transmitting the first reference signal. For example, time domain resources for transmitting the first reference signal may be determined, or frequency domain resources for transmitting the first reference signal may be determined, or transmission power of the first reference signal may be determined, or time domain resources for transmitting the first reference signal, frequency domain resources, and transmission power of the first reference signal may be determined, or time domain resources for transmitting the first reference signal and transmission power of the first reference signal may be determined, or frequency domain resources and frequency domain resources for transmitting the first reference signal may be determined, and so on.

As an alternative embodiment, the terminal device may determine at least one of the time domain resource, the frequency domain resource, or the transmission power of the first reference signal for transmitting the first reference signal according to other fields included in the DCI except for the first field. The fields included in the DCI for determining the time-frequency resource of the first reference signal may include one or more of a time-domain resource allocation field, a frequency hopping indicator field, or an UL/SUL carrier indicator field. The field included in the DCI for determining the transmission power of the first reference signal may include a transmission power control command field. For example, the terminal device may perform one or more of the following operations:

if the DCI includes the time domain resource allocation field, the terminal device may determine, according to the time domain resource allocation field included in the DCI, a time domain resource occupied by the first reference signal; if the DCI includes the frequency domain resource allocation field, the terminal device may determine, according to the frequency domain resource allocation field included in the DCI, a frequency domain resource occupied by the first reference signal; if the DCI comprises the frequency hopping marking field, the terminal equipment can determine whether the first reference signal carries out frequency hopping transmission according to the frequency hopping marking field contained in the DCI; if the DCI includes the UL/SUL carrier indication field, the terminal device may determine whether the first reference signal is transmitted on the UL carrier or the SUL carrier according to the UL/SUL carrier indication field included in the DCI; if the DCI includes the transmission power control command field, the terminal device may determine the transmission power of the first reference signal according to the transmission power control command field included in the DCI. If the frequency hopping indication field indicates that the first reference signal needs to be sent in a frequency hopping manner, the terminal device may send the first reference signal using a specific time-frequency pattern in a sending process according to a predefined rule.

Referring to fig. 8, the terminal device may transmit PUSCH or first reference signal according to the scheduling of DCI. If the value of the MCS field of the DCI received by the terminal equipment is one of 00000-11100, the terminal equipment determines that the PUSCH is normally transmitted, and determines time-frequency resources for transmitting the PUSCH, the transmission power of the PUSCH and the like according to other fields included in the DCI; on the other hand, if the value of the MCS field of the DCI received by the terminal device is 11111, the terminal device determines to transmit only the first reference signal (here, the first value is 11111 as an example), and determines the time domain resource, the frequency domain resource, the transmission power of the first reference signal, and the like of the first reference signal according to other fields included in the DCI. Fig. 8 illustrates an example in which both the PUSCH and the first reference signal are transmitted in a frequency hopping manner. In fig. 8, the OFDM symbol plotted in the horizontal line represents an OFDM symbol carrying PUSCH, and the OFDM symbol plotted "/" represents an OFDM symbol carrying first reference signal.

When normal PUSCH transmission is scheduled, the time domain resource allocation field, the frequency hopping indication field and the UL/SUL carrier indication field can be used for indicating time-frequency resources of the PUSCH, and the transmission power control command field can be used for indicating the sending power of the PUSCH. In this embodiment, if the DCI instructs the terminal device to transmit only the first reference signal, these fields and the related indication method may be multiplexed to indicate one or more of the time domain resources, the frequency domain resources, or the transmission power of the first reference signal, and the terminal device may determine one or more of the time domain resources, the frequency domain resources, or the transmission power according to the fields included in the DCI. By processing in this way, on one hand, the indication of the time-frequency resource and the transmission power of the first reference signal becomes flexible, and the semi-static configuration can be performed according to the DCI dynamic indication instead of only through the RRC signaling; on the other hand, the same indication modes of time-frequency resources and transmission power are ensured when the first reference signal is only transmitted and the PUSCH is normally scheduled, and the realization complexity of the network equipment and the terminal equipment is favorably reduced.

Or, the terminal device may not determine the time-frequency resource and/or the transmission power of the first reference signal according to the DCI. For example, the network device may determine the time domain resource, the frequency domain resource, or the transmission power of the first reference signal according to the RRC signaling, and if the network device does not indicate the time domain resource of the first reference signal according to the RRC signaling, the terminal device may not determine the time domain resource of the first reference signal according to the RRC signaling. When the terminal device receives DCI only for instructing transmission of the first reference signal, one or more of time domain resources, frequency domain resources, or transmission power of the first reference signal may be determined according to the configuration of RRC signaling. For example, the time domain resource of the first reference signal may be determined, or the frequency domain resource of the first reference signal may be determined, or the transmission power of the first reference signal may be determined, or the time domain resource and the frequency domain resource of the first reference signal may be determined, or the time domain resource and the transmission power of the first reference signal may be determined, or the frequency domain resource, the frequency domain resource and the transmission power of the first reference signal may be determined, or the time domain resource, the frequency domain resource and the transmission power of the first reference signal may be determined.

In this way, the network device configures, in a semi-static manner, resources occupied by the first reference signal when only the first reference signal is transmitted, and the network device may not indicate the resources of the first reference signal in the DCI. Then the network device may set all fields (one or more of the time domain resource allocation field, the frequency hopping flag field, the UL/SUL carrier indication field, or the transmission power control command field) in the DCI for indicating resources to be "1" or all fields to be "0", and after the terminal device receives the DCI, if it is determined that the fields are all 0 or all 1, it may be determined that the DCI is received correctly, otherwise, it may be that the DCI is received incorrectly (including a transmission error or a demodulation error, etc.), which is equivalent to enhancing the error correction performance of the terminal device.

After the terminal device determines the time domain resource, the frequency domain resource or the transmission power of the first reference signal according to the manner described above, the first reference signal may be transmitted according to the determined information, and then the network device may receive the first reference signal from the terminal device. After receiving the first reference signal, the network device may perform channel estimation on an uplink channel of the terminal device according to the first reference signal, or may perform other operations.

In addition, the network device may send other DCI to the terminal device in addition to the DCI sent to the terminal device through S32, where the other DCI may schedule the terminal device to send PUSCH to the network device, or send other reference signals, and the terminal device may also send corresponding information to the network device according to the other DCI, which is not limited herein.

In the above introduction process, if the DCI multiplexes the DCI with the existing format, the DCI multiplexed with the DCI format 0_0 is taken as an example, and it can be clear to those skilled in the art that the technical solution provided in the embodiment of the present application is also applicable to the DCI with the DCI format 0_1 or the DCI with other existing formats.

The embodiment of the application enables decoupling of transmission data and a reference signal, namely, the data and the reference signal can be respectively transmitted. The network device can separately instruct the terminal device to transmit the first reference signal through the DCI to enhance the channel estimation performance without relying on only the DMRS in the PUSCH for channel estimation. For example, in a deep coverage scenario, the network device may instruct only the terminal device to transmit the first reference signal multiple times, so that the network device may obtain more first reference signals to improve the accuracy of channel estimation. By the method provided by the embodiment of the application, the network equipment can flexibly instruct the terminal equipment to send the first reference signal on the basis of not changing the length and the format of the existing DCI, and the channel estimation performance of the network equipment is improved, so that the coverage performance of a communication system is improved, and the method is low in complexity and high in feasibility.

The following describes an apparatus for implementing the above method in the embodiment of the present application with reference to the drawings. Therefore, the above contents can be used in the subsequent embodiments, and the repeated contents are not repeated.

Fig. 9 is a schematic block diagram of a communication device 900 provided in an embodiment of the present application. Illustratively, the communication device 900 is, for example, a terminal device 900. The terminal device 900 comprises a processing module 910 and a transceiver module 920. Among other things, the processing module 910 may be configured to perform all operations performed by the terminal device in the embodiment shown in fig. 3 except transceiving operations, such as determining that the received DCI is only used to instruct the terminal device to transmit the first reference signal, and/or other procedures for supporting the techniques described herein. The transceiving module 920 may be used to perform all transceiving operations performed by the terminal device in the embodiment illustrated in fig. 3, e.g., S32 and S33, and/or other processes for supporting the techniques described herein.

A transceiver module 920, configured to receive downlink control information DCI, where the DCI is only used to instruct a terminal device 900 to transmit a first reference signal;

a processing module 910, configured to determine that the DCI only instructs the terminal device 900 to transmit the first reference signal;

a transceiving module 920, configured to transmit the first reference signal according to the DCI.

As an optional embodiment, the DCI is not used for scheduling data.

As an optional embodiment, the DCI includes a first field; wherein the content of the first and second substances,

when the value of the first field is a first value, the DCI is only used to instruct the terminal device 900 to transmit a first reference signal; or the like, or, alternatively,

As an optional implementation manner, the first field is an MCS field.

As an optional implementation manner, the first range includes at least two of the following values:

11100；

11101；

11110; or the like, or, alternatively,

11111。

as an alternative embodiment, the first value is 11100, 11101, 11110, or 11111.

As an optional implementation manner, different values of the first field correspond to different initial phase determination manners, and the processing module 910 is configured to:

and determining a determination mode of an initial phase of the sequence of the first reference signal carried on a time domain symbol for transmitting the first reference signal according to the value of the first field.

As an optional implementation manner, the first reference signal is carried in at least two time slots, and the initial phases of the sequences of the first reference signals carried by the at least two time slots are the same or different.

As an optional implementation manner, the initial phases of the sequences of the first reference signals carried by the at least two timeslots are the same, and the determining manner includes:

determining an initial phase of a sequence of the first reference signal in the at least two slots according to an index of a first slot of the at least two slots and an index of a first time domain symbol in the first slot, the first slot being a predefined slot of the at least two slots.

As an optional implementation manner, the initial phases of the sequences of the first reference signals carried by the at least two timeslots are different, and the determining manner includes:

determining an initial phase of a sequence of the first reference signal in the first slot according to an index of a first slot of the at least two slots and an index of a first time domain symbol in the first slot.

As an optional implementation, the processing module 910 is further configured to:

As an optional implementation manner, the transceiver module 920 is further configured to receive an RRC signaling from the network device, and determine one or more of a time domain resource, a frequency domain resource, and a transmission power occupied by the first reference signal according to the RRC signaling.

As an optional implementation manner, the format of the DCI is DCI format 0_0 or DCI format 0_ 1.

It should be understood that the processing module 910 in the embodiments of the present application may be implemented by a processor or a processor-related circuit component, and the transceiver module 920 may be implemented by a transceiver or a transceiver-related circuit component.

As shown in fig. 10, an embodiment of the present application further provides a communication device 1000. Illustratively, the communication device 1000 is, for example, a terminal device 1000. The terminal device 1000 includes a processor 1010, a memory 1020 and a transceiver 1030, wherein the memory 1020 stores instructions or programs and the processor 1010 is configured to execute the instructions or programs stored in the memory 1020. When the instructions or programs stored in the memory 1020 are executed, the processor 1010 is configured to perform the operations performed by the processing module 910 in the above embodiments, and the transceiver 1030 is configured to perform the operations performed by the transceiver module 920 in the above embodiments.

It should be understood that the terminal device 900 or the terminal device 1000 according to the embodiment of the present application may correspond to the terminal device in the embodiment shown in fig. 3, and operations and/or functions of each module in the terminal device 900 or the terminal device 1000 are respectively for implementing the corresponding flow in the embodiment shown in fig. 3, and are not described herein again for brevity.

Fig. 11 is a schematic block diagram of a communication device 1100 provided in an embodiment of the present application. Illustratively, the communication device 1100 is, for example, a network device 1100. Network device 1100 includes a processing module 1110 and a transceiver module 1120. Processing module 1110 may be used, among other things, to perform all operations performed by a network device in the embodiment shown in fig. 3 except transceiving operations, e.g., S31, and/or other processes for supporting the techniques described herein. The transceiving module 1120 may be configured to perform all transceiving operations performed by a network device in the embodiment illustrated in fig. 3, e.g., S32 and S33, and/or other processes to support the techniques described herein.

A processing module 1110, configured to determine DCI, where the DCI is only used to instruct the terminal device to transmit a first reference signal;

a transceiver module 1120, configured to send the DCI to a terminal device, where the DCI is only used to instruct the terminal device to send a first reference signal;

a transceiver module 1120 further configured to receive the first reference signal indicated by the DCI from the terminal device.

As an optional embodiment, the DCI is not used for scheduling data.

As an optional implementation manner, the first field is an MCS field.

11100；

11101；

11110; or the like, or, alternatively,

11111。

as an alternative embodiment, the first value is 11100, 11101, 11110, or 11111.

As an optional implementation manner, different values of the first field correspond to different initial phase determination manners, and the determination manner of the initial phase of the sequence of the first reference signal carried on the time domain symbol in which the first reference signal is sent corresponds to the value of the first field.

As an optional embodiment, the DCI further includes one or more of a time domain resource allocation resource, a frequency domain resource allocation resource, or a transmission power control command field, wherein,

As an optional implementation manner, the transceiver module 1120 is further configured to send, to the terminal device, an RRC signaling, where the RRC signaling is used to indicate one or more of a time domain resource, a frequency domain resource, and a transmission power occupied by the first reference signal.

It is understood that the processing module 1110 in the embodiments of the present application may be implemented by a processor or a processor-related circuit component, and the transceiver module 1120 may be implemented by a transceiver or a transceiver-related circuit component.

As shown in fig. 12, an embodiment of the present application further provides a communication device 1200. Illustratively, the communication device 1200 is, for example, a network device 1200. The network device 1200 comprises a processor 1210, a memory 1220 and a transceiver 1230, wherein the memory 1220 stores instructions or programs and the processor 1210 is configured to execute the instructions or programs stored in the memory 1220. When the instructions or programs stored in the memory 1220 are executed, the processor 1210 is configured to perform the operations performed by the processing module 1110 in the above embodiments, and the transceiver 1230 is configured to perform the operations performed by the transceiver module 1120 in the above embodiments.

It should be understood that the network device 1100 or the network device 1200 according to the embodiment of the present application may correspond to the network device in the embodiment shown in fig. 3, and operations and/or functions of the respective modules in the network device 1100 or the network device 1200 are respectively for implementing the corresponding flows in the embodiment shown in fig. 3, and are not described herein again for brevity.

The embodiment of the application also provides a communication device, and the communication device can be terminal equipment or a circuit. The communication apparatus may be used to perform the actions performed by the terminal device in the method embodiment shown in fig. 3 described above.

When the communication apparatus is a terminal device, fig. 13 shows a simplified structural diagram of the terminal device. For easy understanding and illustration, in fig. 13, the terminal device is exemplified by a mobile phone. As shown in fig. 13, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used for processing communication protocols and communication data, controlling the terminal equipment, executing software programs, processing data of the software programs and the like. The memory is used primarily for storing software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user. It should be noted that some kinds of terminal devices may not have input/output devices.

When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs baseband signals to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signals and sends the radio frequency signals to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data. For ease of illustration, only one memory and processor are shown in FIG. 13. In an actual end device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in this embodiment.

In the embodiment of the present application, the antenna and the radio frequency circuit having the transceiving function may be regarded as a transceiving unit of the terminal device, and the processor having the processing function may be regarded as a processing unit of the terminal device. As shown in fig. 13, the terminal device includes a transceiving unit 1310 and a processing unit 1320. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. A processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, or the like. Alternatively, a device for implementing the receiving function in the transceiving unit 1310 may be regarded as a receiving unit, and a device for implementing the transmitting function in the transceiving unit 1310 may be regarded as a transmitting unit, that is, the transceiving unit 1310 includes a receiving unit and a transmitting unit. A transceiver unit may also sometimes be referred to as a transceiver, transceiving circuitry, or the like. A receiving unit may also be referred to as a receiver, a receiving circuit, or the like. A transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc.

It should be understood that the transceiving unit 1310 is configured to perform the transmitting operation and the receiving operation on the terminal device side in the method embodiment shown in fig. 3, and the processing unit 1320 is configured to perform other operations besides the transceiving operation on the terminal device side in the method embodiment shown in fig. 3.

For example, in one implementation, the transceiving unit 1310 is configured to perform transceiving steps on the terminal device side in the embodiment shown in fig. 3, e.g., S32 and S33, and/or other processes for supporting the techniques described herein. A processing unit 1320, configured to perform other operations besides the transceiving operation on the terminal device side in the embodiment shown in fig. 3, for example, a step of determining that the DCI is only used for instructing the terminal device to transmit the first reference signal, and/or other procedures for supporting the techniques described herein.

When the communication device is a chip, the chip includes a transceiver unit and a processing unit. The transceiver unit can be an input/output circuit and a communication interface; the processing unit is a processor or a microprocessor or an integrated circuit integrated on the chip.

When the communication device in the embodiment of the present application is a terminal device, reference may be made to the device shown in fig. 14. As an example, the device may perform functions similar to processor 1010 of FIG. 10. In fig. 14, the apparatus includes a processor 1410, a transmit data processor 1420, and a receive data processor 1430. The processing module 910 in the above embodiments may be the processor 1410 in fig. 14, and performs corresponding functions; the transceiver module 920 in the above embodiments may be the transmission data processor 1420, and/or the reception data processor 1430 in fig. 14.

Although fig. 14 shows a channel encoder and a channel decoder, it is understood that these blocks are not limitative and only illustrative to the present embodiment.

Fig. 15 shows another form of the present embodiment. The processing device 1500 includes modules such as a modulation subsystem, a central processing subsystem, and peripheral subsystems. The communication device in this embodiment may serve as a modulation subsystem therein. In particular, the modulation subsystem may include a processor 1503 and an interface 1504. The processor 1503 performs the functions of the processing module 910, and the interface 1504 performs the functions of the transceiver module 920. As another variation, the modulation subsystem includes a memory 1506, a processor 1503, and a program stored in the memory 1506 and executable on the processor, and the processor 1503 executes the program to implement the method of the terminal device side in the method embodiment shown in fig. 3. It should be noted that the memory 1506 may be non-volatile or volatile, and may be located within the modulation subsystem or within the processing device 1500, as long as the memory 1506 is connected to the processor 1503.

The embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, can implement the process related to the terminal device in the embodiment shown in fig. 3 and provided by the foregoing method embodiment.

Embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, can implement the process related to the network device in the embodiment shown in fig. 3 and provided by the foregoing method embodiments.

An embodiment of the present application further provides a computer program product containing instructions, where the instructions, when executed, perform the method on the terminal device side in the method embodiment shown in fig. 3.

Embodiments of the present application further provide a computer program product containing instructions, where the instructions, when executed, perform the method on the network device side in the method embodiment shown in fig. 3.

It should be understood that the processor mentioned in the embodiments of the present application may be a Central Processing Unit (CPU), and may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It will also be appreciated that the memory referred to in the embodiments of the application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

It should be noted that when the processor is a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, the memory (memory module) is integrated in the processor.

It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific implementation of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the embodiments of the present application, and all the changes or substitutions should be covered by the scope of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, comprising:

sending DCI to a terminal device, wherein the DCI is only used for indicating the terminal device to send a first reference signal;

receiving the first reference signal indicated by the DCI from the terminal device.

2. The method of claim 1, wherein the DCI further comprises one or more of a time domain resource allocation resource field, a frequency domain resource allocation resource field, or a transmission power control command field, wherein,

3. A method of communication, comprising:

receiving Downlink Control Information (DCI), wherein the DCI is only used for indicating terminal equipment to send a first reference signal;

and the terminal equipment transmits the first reference signal according to the DCI.

4. The method of any of claims 1 to 3, wherein the DCI is not used for scheduling data.

5. The method according to any one of claims 1 to 4, wherein the DCI comprises a first field; wherein the content of the first and second substances,

6. The method of claim 5, wherein the first field is a Modulation and Coding Strategy (MCS) field.

7. The method of claim 5 or 6, wherein the first range comprises at least two of the following values:

11100；

11101；

11110; or the like, or, alternatively,

11111。

8. the method of claim 6 or 7, wherein the first value is 11100, 11101, 11110, or 11111.

9. The method according to any one of claims 5 to 8, wherein different values of the first field correspond to different initial phase determination modes, and the method further comprises:

10. The method of claim 9, wherein the first reference signal is carried in at least two time slots, and wherein the initial phases of the sequences of the first reference signal carried by the at least two time slots are the same or different.

11. The method according to claim 10, wherein the initial phases of the sequences of the first reference signals carried by the at least two slots are the same, and wherein the determining comprises:

12. The method of claim 10, wherein the initial phases of the sequences of the first reference signals carried by the at least two slots are different, and wherein the determining comprises:

13. The method according to any one of claims 3 to 12, further comprising one or any combination of the following:

14. A communication device, comprising:

a processor configured to determine DCI, the DCI being only used to instruct the terminal device to transmit a first reference signal;

a transceiver, configured to send the DCI to a terminal device, where the DCI is only used to instruct the terminal device to send a first reference signal;

15. The communications device of claim 14, wherein the DCI further comprises one or more of a time domain resource allocation resource field, a frequency domain resource allocation resource field, or a transmission power control command field, wherein,

16. A communication device, comprising:

a transceiver for receiving DCI, wherein the DCI is only used for instructing a terminal device to transmit a first reference signal;

a processor configured to determine that the DCI only instructs a terminal device to transmit a first reference signal;

17. The communications device of any one of claims 14 to 16, wherein said DCI is not used for scheduling data.

18. The apparatus according to any one of claims 14 to 17, wherein the DCI comprises a first field; wherein the content of the first and second substances,

19. The communications device of claim 18, wherein the first field is a Modulation and Coding Strategy (MCS) field.

20. The communication device according to claim 18 or 19, wherein the first range comprises at least two of the following values:

11100；

11101；

11110; or the like, or, alternatively,

11111。

21. a communication device as claimed in claim 18 or 19, wherein the first value is 11100, 11101, 11110 or 11111.

22. The communication device according to any one of claims 18 to 21, wherein different values of the first field correspond to different initial phase determination manners, and the processor is further configured to determine, according to the value of the first field, a determination manner for an initial phase of a sequence of the first reference signal carried on a time domain symbol in which the first reference signal is transmitted.

23. The communications device of claim 22, wherein the first reference signal is carried in at least two time slots, and wherein the initial phases of the sequences of the first reference signal carried by the at least two time slots are the same or different.

24. The communications device of claim 23, wherein the initial phases of the sequences of the first reference signals carried by the at least two timeslots are the same, and wherein the determining comprises:

25. The communications device of claim 23, wherein the initial phases of the sequences of the first reference signals carried by the at least two timeslots are different, and wherein the determining comprises:

26. The communication device of any of claims 16 to 25, wherein the processor is further configured to perform one or any combination of the following:

27. A computer-readable storage medium, characterized in that it stores a computer program which, when run on a computer, causes the computer to perform the method of any of claims 1, 2, 4-12, or causes the computer to perform the method of any of claims 3-13.

28. A chip system, comprising:

a memory: for storing instructions;

a processor configured to call and execute the instructions from the memory, so that a communication device installed with the chip system executes the method according to any one of claims 1, 2, and 4 to 12, or so that the communication device executes the method according to any one of claims 3 to 13.