Communication method and apparatus

Abstract

The present application provides a communication method and apparatus. Although a DMRS symbol carries single-carrier data, the single-carrier data and a DMRS sequence carried therein are frequency division multiplexed, which is conducive to improving spectral efficiency. However, whether a terminal uses this feature depends on terminal capabilities. The solution provided in the present application allows for a network device to indicate to a terminal whether a reference symbol carries single-carrier data or does not carry single-carrier data, which is conducive to differentiated processing of reference symbols by terminals with different capabilities, and optimizing transmission performance.

Description

Communication method and apparatus

[0001] The present application claims priority from the Chinese patent application No. 202411366077.0 filed on September 27, 2024, and entitled "Communication method and apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of communication technology, in particular to a communication method and apparatus. BACKGROUND

[0003] In a communication system, the data signal sent by the sending end can be received by the receiving end after passing through the transmission channel. The data signal will change in the transmission channel (such as the data signal will superimpose noise, fading, etc.), so there is a difference between the data signal received by the receiving end and the data signal sent by the sending end. In order to accurately restore the data signal sent by the sending end, the receiving end needs to know what changes the data signal has undergone in the transmission process, therefore, the reference signal (RS) is introduced.

[0004] The reference signal is a known signal, which can be transmitted together with the data signal in the transmission channel. The receiving end can estimate the changes of the data signal transmitted together with the reference signal in the transmission channel by comparing the difference between the received reference signal and the actual reference signal, so as to restore the received data signal to the data signal sent by the sending end. In addition, the reference signal can also be used for channel quality measurement, obtaining the weight of analog beamforming or sensing the target, etc.

[0005] Usually, the reference signal and the data signal are sent in a time division multiplexing manner, that is, the reference signal and the data signal are sent through different symbols. In order to improve the spectral efficiency, it is proposed that the symbol carrying the reference signal also carries the data signal, specifically, the reference signal and the data signal occupy different frequency domain resources. This way will make the peak to average power ratio (PAPR) of the transmitted signal higher, resulting in lower transmission power of the transmitted signal, which affects the coverage. SUMMARY

[0006] Through analysis, it is found that the RS symbol carrying the RS sequence also carries single carrier data, where the carried single carrier data and the RS sequence are frequency division multiplexed, which is beneficial to improve the spectral efficiency. However, whether the terminal uses this feature is related to the capability of the terminal.

[0007] To this end, the application provides a communication method and device. The network device can instruct the terminal to carry single-carrier modulated first data in the reference symbol or not to carry single-carrier modulated first data, which is beneficial to differentiating the processing of the reference symbol for terminals with different capabilities, so as to improve the spectral efficiency or communication capacity.

[0008] The technical solutions provided by the application are described below.

[0009] In a first aspect, the application provides a communication method, which can be executed by a first device. In the application, the first device can refer to the first device itself, or a component in the first device, such as a processor, a circuit, a logic module, software, a chip, or a chip system, etc., which is used to realize all or part of the functions of the first device. For example, the first device is a terminal. The possible forms of the terminal will be described later, which will not be expanded here.

[0010] In the method, the first device receives first information sent by a second device, the first information indicating that a reference symbol carries first data, or the first information indicating that the reference symbol does not carry the first data, wherein the first data is single-carrier modulated. In this way, it is beneficial to differentiate the processing of the reference symbol for terminals with different capabilities, and to support differentiated terminals. For example, it is beneficial to support terminals that carry first data in the reference symbol, and to carry first data in the reference symbol. For example, it is beneficial to support terminals that do not support the reference symbol carrying first data, and do not carry first data in the reference symbol.

[0011] For example, the second device is a wireless access device. The possible forms of the wireless access device will be described later, which will not be expanded here.

[0012] The reference symbol (or RS symbol) can be a symbol where the RS sequence is located. As an example, the RS sequence can be a demodulation reference signal (DMRS) sequence, a sounding reference signal (SRS) sequence, a tracking reference signal (TRS) sequence, or a channel state information reference signal (CSI-RS) sequence. Correspondingly, the reference symbol can be a DMRS symbol, an SRS symbol, a TRS symbol, or a CSI-RS symbol.

[0013] In a possible implementation of the first aspect, in the method, the first device further processes the reference symbol after receiving the first information. In the application, the processing of the reference symbol by the first device can include transmitting the reference symbol or receiving the reference symbol by the first device. Based on the first information indicating that the reference symbol carries the first data, the reference symbol processed by the first device can carry the first data, and based on the first information indicating that the reference symbol does not carry the first data, the reference symbol processed by the first device can not carry the first data.

[0014] In a possible implementation manner of the first aspect, the reference symbol carrying the first data can include that the reference symbol carries an RS sequence and the first data, the RS sequence does not overlap with the frequency domain resource occupied by the first data, or in other words, the RS sequence is frequency division multiplexed with the first data.

[0015] In a possible implementation manner of the first aspect, the reference symbol not carrying the first data can include that the reference symbol does not carry data, or the reference symbol carries data using non-single carrier modulation (such as multi-carrier modulation).

[0016] In a possible implementation manner of the first aspect, in the method, before receiving the first information sent by the second device, the first device sends second information to the second device, the second information indicates a first condition, the first condition is a condition that one or more parameters are satisfied, the one or more parameters are parameters related to processing service data by the first device, the service data includes the first data, and the first condition is related to a first capability. In the present application, the first capability includes that the reference symbol carries the first data.

[0017] In the present application, the first condition being related to the first capability can be understood as that the satisfaction of the first condition is related to whether the first device supports the first capability or the satisfaction of the first condition is related to whether the reference symbol carries the first data.

[0018] In the present application, the "satisfaction of the first condition" can be replaced by "whether the first condition is satisfied", and "whether the first device supports the first capability" can be replaced by "whether the first device supports processing the reference symbol carrying the first data" or "whether the first device supports the reference symbol carrying the first data".

[0019] In a possible implementation manner of the first aspect, when the first condition is satisfied, the first device supports the first capability.

[0020] In a possible implementation manner of the first aspect, when the first condition is not satisfied, the first device does not support the first capability. In the present application, the first condition not being satisfied can be understood as that all or part of the one or more parameters do not satisfy the first condition.

[0021] By the above implementation, the second device can determine whether the reference symbol carries the first data based on the second information sent by the first device, and further determine the first information. For example, for the first device, when the one or more parameters satisfy the first condition, the first device supports the first capability, or when the one or more parameters satisfy the first condition, the first device expects the reference symbol to carry the first data to improve the spectral efficiency or the communication capacity. The first device sends the second information to the second device, and the second information indicates the first condition. The second device receives the second information sent by the first device, and can obtain the first condition. The second device determines whether the reference symbol carries the first data based on the obtained first condition. For example, if the parameters actually involved in the transmission of the service data between the second device and the first device satisfy the first condition, the reference symbol carries the first data, and therefore, the first message indicates that the reference symbol carries the first data; if the parameters actually involved in the transmission of the service data between the second device and the first device do not satisfy the first condition, the reference symbol does not carry the first data, and therefore, the first message indicates that the reference symbol does not carry the first data.

[0022] In a possible implementation of the first aspect, the service data further includes the second data, the second data occupies different time domain resources from the reference symbol, and the second data is modulated by using single carrier modulation. In other words, the second data is carried in a data symbol, and the data symbol and the reference symbol are different time domain symbols.

[0023] In a possible implementation of the first aspect, the first device processes the data symbol in addition to processing the reference symbol.

[0024] In a possible implementation of the first aspect, a peak-to-average power ratio (PAPR) of the reference symbol is not higher than a PAPR of the data symbol.

[0025] The pin, the number of the reference symbols, a time domain resource overhead of the reference symbols, or a bandwidth for transmitting the service data.

[0026] In a possible implementation, the first device processes a number of RS symbols, where a is a positive integer.

[0027] In a possible implementation, the first device processes a number of RS symbols and a number of data symbols, and a time domain resource overhead of the reference symbols is where a and b are positive integers.

[0028] In a possible implementation, the one or more parameters include a modulation order of the second data. In this way, when the first capability is supported, the PAPR of the RS symbol does not exceed the PAPR of the data symbol carrying the second data, and / or a certain capacity gain is obtained by using the RS symbol to carry the first data.

[0029] In a possible implementation, the one or more parameters comprise: a modulation and coding scheme (MCS) of the second data. In this way, it can be guaranteed that the PAPR of the RS symbol does not exceed the PAPR of the data symbol carrying the second data and / or a certain capacity gain is obtained by carrying the first data with the RS symbol when the first capability is supported.

[0030] In a possible implementation, the one or more parameters comprise: a Zadoff-Chu (ZC) sequence root of the RS sequence. In this way, it can be guaranteed that the PAPR of the RS symbol does not exceed the PAPR of the data symbol carrying the second data when the first capability is supported.

[0031] In a possible implementation, the one or more parameters comprise: an overhead of the RS sequence. In this way, it can be guaranteed that the PAPR of the RS symbol does not exceed the PAPR of the data symbol carrying the second data when the first capability is supported.

[0032] In a possible implementation, the one or more parameters comprise: a modulation order of the second data, a Zadoff-Chu (ZC) sequence root of the RS sequence. In this way, it can be guaranteed that the PAPR of the RS symbol does not exceed the PAPR of the data symbol carrying the second data and / or a certain capacity gain is obtained by carrying the first data with the RS symbol when the first capability is supported.

[0033] In a possible implementation, the one or more parameters comprise: a modulation and coding scheme (MCS) of the second data, a Zadoff-Chu (ZC) sequence root of the RS sequence. In this way, it can be guaranteed that the PAPR of the RS symbol does not exceed the PAPR of the data symbol carrying the second data and / or a certain capacity gain is obtained by carrying the first data with the RS symbol when the first capability is supported.

[0034] In a possible implementation, the one or more parameters comprise: a modulation order of the second data, an overhead of the RS sequence, a bandwidth for transmitting the service data. In this way, it can be guaranteed that the PAPR of the RS symbol does not exceed the PAPR of the data symbol carrying the second data and / or a certain capacity gain is obtained by carrying the first data with the RS symbol when the first capability is supported.

[0035] In a possible implementation, the one or more parameters comprise: a modulation and coding scheme (MCS) of the second data, an overhead of the RS sequence, a bandwidth for transmitting the service data. In this way, it can be guaranteed that the PAPR of the RS symbol does not exceed the PAPR of the data symbol carrying the second data and / or a certain capacity gain is obtained by carrying the first data with the RS symbol when the first capability is supported.

[0036] In a possible implementation, the one or more parameters comprise: a modulation order of the second data, a Zadoff-Chu (ZC) sequence root of the RS sequence, an overhead of the RS sequence. In this way, it can be guaranteed that the PAPR of the RS symbol does not exceed the PAPR of the data symbol carrying the second data and / or a certain capacity gain is obtained by carrying the first data with the RS symbol when the first capability is supported.

[0037] In a possible implementation, the one or more parameters comprise: a modulation and coding scheme (MCS) of the second data, a Zadoff-Chu (ZC) sequence root of the RS sequence, an overhead of the RS sequence. In this way, it can be guaranteed that the PAPR of the RS symbol does not exceed the PAPR of the data symbol carrying the second data and / or a certain capacity gain is obtained by carrying the first data with the RS symbol when the first capability is supported.

[0038] In a possible implementation, the one or more parameters comprise: a modulation order of the second data, a modulation and coding scheme (MCS) of the second data, a Zadoff-Chu (ZC) sequence root of the RS sequence, an overhead of the RS sequence. In this way, it can be guaranteed that the PAPR of the RS symbol does not exceed the PAPR of the data symbol carrying the second data and / or a certain capacity gain is obtained by carrying the first data with the RS symbol when the first capability is supported.

[0039] In a possible implementation, the one or more parameters comprise: a modulation order of the second data, a modulation and coding scheme (MCS) of the second data, a Zadoff-Chu (ZC) sequence root of the RS sequence, an overhead of the RS sequence, or a bandwidth for transmitting the service data. In this way, it can be guaranteed that the PAPR of the RS symbol does not exceed the PAPR of the data symbol carrying the second data and / or a certain capacity gain is obtained by carrying the first data with the RS symbol when the first capability is supported.

[0040] In a possible implementation, the one or more parameters comprise: a quantity of the reference symbols. In this way, a certain capacity gain is obtained by carrying the first data with the RS symbol.

[0041] In a possible implementation, the one or more parameters comprise: a time-domain resource overhead of the reference symbols. In this way, a certain capacity gain is obtained by carrying the first data with the RS symbol.

[0042] In a possible implementation, the one or more parameters comprise: a quantity of the reference symbols, a time-domain resource overhead of the reference symbols. In this way, a certain capacity gain is obtained by carrying the first data with the RS symbol.

[0043] In a possible implementation, the first condition is a condition that one or more parameters satisfy, and the first condition is a threshold corresponding to the one or more parameters.

[0044] In a possible implementation, the first condition includes a plurality of second conditions, and each second condition is only related to one parameter.

[0045] For example, the one or more parameters include a modulation order of the second data and a Zadoff-Chu (ZC) sequence root of the RS sequence. The first condition includes two second conditions. A first second condition corresponds to a threshold of the ZC sequence root of the RS sequence, and is irrelevant to the modulation order of the second data. A second second condition corresponds to a threshold of the modulation order of the second data, and is irrelevant to the ZC sequence root of the RS sequence.

[0046] In a possible implementation, the first condition includes a plurality of second conditions, and at least one second condition is related to the one or more parameters.

[0047] For example, the one or more parameters include a modulation order of the second data and a Zadoff-Chu (ZC) sequence root of the RS sequence and an overhead of the RS sequence. The first condition includes one second condition. The second condition is a threshold of the ZC sequence root. The threshold is related to the modulation order of the second data and the overhead of the RS sequence.

[0048] For another example, the first condition includes two second conditions. A first second condition is a threshold of the modulation order of the second data, and is irrelevant to the ZC sequence root of the RS sequence and the overhead of the RS sequence. A second second condition is a threshold of the ZC sequence root. The threshold is related to the modulation order of the second data and the overhead of the RS sequence.

[0049] The above only exemplarily lists several possible combinations of different parameters included in the one or more parameters, and other combinations of different parameters can be included in the one or more parameters in actual applications, which are not listed one by one here.

[0050] In a possible implementation of the first aspect, in the method, the first device sends third information to the second device before receiving the first information sent by the second device, and the third information indicates a capability of the first device.

[0051] In a possible implementation, the third information indicates whether the first device supports pi / 2-binary phase shift keying (BPSK).

[0052] In a possible implementation, the third information indicates whether the first device supports a first processing manner, where the first processing manner is used to reduce the PAPR of the reference symbol. Possible types of the first processing manner will be described below by way of example, which will not be described here. In a possible implementation, the third information indicates whether the first device supports pi / 2-binary phase shift keying (BPSK) and / or the first processing manner.

[0053] By the above implementation, it is beneficial for the second device to determine whether the reference symbol carries the first data based on the third information sent by the first device, and further determine the first message. For example, when the second device cannot obtain the third message, or can obtain the third message but the third message indicates that the first device cannot support the first processing manner, the first device determines that the reference symbol does not carry the data, and further the first message indicates that the reference symbol does not carry the first data. When the second device can obtain the third message, and the third message indicates that the first device supports the first processing manner, for example, the first processing manner is to make the modulation order of the first data lower than the modulation order of the second data and / or reduce the EPRE of the first data. It should be understood that by making the modulation order of the first data lower than the modulation order of the second data and / or reducing the EPRE of the first data, the PAPR of the reference symbol can be limited to not exceed the PAPR of the data symbol carrying the second data. At this time, based on the third message, the second device determines that the reference symbol carries the first data, and the modulation order of the first data is lower than the modulation order of the second data and / or the EPRE of the first data is reduced, and accordingly, the first message indicates that the reference symbol carries the first data.

[0054] For another example, the first device supports pi / 2-BPSK (it should be understood that the modulation order of pi / 2-BPSK is 1), and also supports the first processing manner, where the first processing manner is to make the modulation order of the first data lower than the modulation order of the second data and / or reduce the EPRE of the first data. Through the third message, the second device knows that the first device supports pi / 2-BPSK and the first processing manner. When the modulation order of the second data is 2 or more, the second device can determine a reference symbol design scheme: the reference symbol carries the first data using the pi / 2-BPSK sequence, that is, the first processing manner is used to ensure that the PAPR of the reference symbol does not exceed the PAPR of the data symbol carrying the second data. Accordingly, the first message indicates that the reference symbol carries the first data.

[0055] For example, the first device does not support pi / 2-BPSK but supports the first processing manner, wherein the first processing manner is to lower the modulation order of the first data than the modulation order of the second data and / or to lower the EPRE of the first data. In this case, the second device knows that the first device does not support pi / 2-BPSK but supports the first processing manner through the third message. When the modulation order of the second data is 2, the second device knows that the PAPR of the reference symbol cannot be lowered by lowering the modulation order of the first data to 1. Thus, when the modulation order of the second data is 2, the second device determines that the reference symbol does not carry the first data, and accordingly, the first message indicates that the reference symbol does not carry the first data. When the modulation order of the second data is 4 or above, the second device determines that the reference symbol carries the first data, wherein the modulation order of the first data is not 1 and is lower than the modulation order of the second data and / or the EPRE of the first data is lowered, and accordingly, the first message indicates that the reference symbol carries the first data. In this case, the first information can indicate that the reference symbol carries the first data to lower the peak-to-average power ratio (PAPR) of the reference symbol.

[0056] In a possible implementation of the first aspect, the third information is related to the first capability.

[0057] In a possible implementation of the first aspect, the third information is related to the first capability, which can be understood as that the first device supports the first capability when the first device processes the service data in the manner indicated by the third information.

[0058] In a possible implementation of the first aspect, the third information is related to the first capability, which can be understood as that the first device can not support the first capability when the first device does not process the service data in the manner indicated by the third information. As described above, the manner indicated by the third information includes pi / 2-BPSK and / or the first processing manner.

[0059] In this application, "related" can be replaced by "relevant" or "associated" and the like. The first device processing the service data can be understood as that the first device processes the reference symbol and / or processes the data symbol.

[0060] In a possible implementation of the first aspect, in the method, the first device sends fourth information to the second device before receiving the first information sent by the second device, and the fourth information indicates that the first capability is supported or not supported.

[0061] In this way, the second device can determine whether the first device supports the first capability based on the fourth information sent by the first device, and then determine the first information according to whether the first device has the first capability. For example, when the first device does not support the first capability, the first information can indicate that the reference symbol carries the first data, so as to avoid the first device from failing to transmit service data. For example, when the first device supports the first capability, the first information can indicate that the reference symbol does not carry the first data.

[0062] In a possible implementation of the first aspect, the first information is carried by at least one of the following: downlink control information (DCI), a radio resource control (RRC) message, or a medium access control control element (MAC-CE).

[0063] In a second aspect, the present application provides a communication method, which can be performed by a second device. In the present application, the "second device" can refer to the second device itself, or a component in the second device, such as a processor, a circuit, a logic module, software, a chip, or a chip system, which is used to implement all or part of the functions of the second device. For example, the second device is a wireless access device. Possible forms of the wireless access device will be described later, which will not be expanded here.

[0064] In the method, the second device sends first information to the first device, where the first information indicates that a reference symbol carries first data, or the first information indicates that the reference symbol does not carry the first data, and the first data is modulated by using a single carrier. In this way, the terminals with different capabilities can be differentiated in processing the reference symbol, and terminals with different capabilities can be supported. For example, the terminal that supports the reference symbol carrying the first data can carry the first data in the reference symbol. For example, the terminal that does not support the reference symbol carrying the first data can not carry the first data in the reference symbol.

[0065] The first information or the content indicated by the first information can be understood with reference to the related content of the first aspect. For example, the reference symbol carrying the first data can include that the reference symbol carries a RS sequence and the first data, and the reference symbol not carrying the first data can include that the reference symbol does not carry data, or the reference symbol carries data modulated by using a non-single carrier (such as a multi-carrier). For example, in a possible implementation, the RS sequence can be a demodulation reference signal (DMRS) sequence, a sounding reference signal (SRS) sequence, a tracking reference signal (TRS) sequence, or a channel state information reference signal (CSI-RS) sequence. Correspondingly, the reference symbol can be a DMRS symbol, an SRS symbol, a TRS symbol, or a CSI-RS symbol. For example, in a possible implementation, the first information is carried by at least one of the following: downlink control information (DCI), a radio resource control (RRC) message, or a medium access control control element (MAC-CE).

[0066] In a possible implementation of the second aspect, the second device receives second information sent by the first device before sending the first information to the first device.

[0067] The second information or the content indicated by the second information can be understood with reference to the related content of the first aspect.

[0068] For example, in a possible implementation of the second aspect, the second information indicates a first condition, the first condition is a condition that one or more parameters satisfy, the one or more parameters are parameters related to processing service data by the first device, the service data includes the first data, and the first condition is related to a first capability, the first capability includes that the reference symbol carries the first data.

[0069] For example, in a possible implementation of the second aspect, the one or more parameters include at least one of a modulation order of second data, a modulation and coding scheme (MCS) of the second data, a Zadoff-Chu (ZC) sequence root of the RS sequence, an overhead of the RS sequence, a number of the reference symbols, a time domain resource overhead of the reference symbols, or a bandwidth for transmitting the data. The service data and the second data can be understood with reference to the related content in the first aspect, for example, the second data is carried in the data symbol, and the service data includes the first data carried in the reference symbol and the second data carried in the data symbol.

[0070] In a possible implementation of the second aspect, the second device receives third information sent by the first device before sending the first information to the first device.

[0071] The third information or the content indicated by the third information can be understood with reference to the related content of the first aspect. For example, the third information indicates a capability of the first device.

[0072] In a possible implementation of the second aspect, the second device receives fourth information sent by the first device before sending the first information to the first device, the fourth information indicates whether to support a first capability or not, and the first capability includes that the reference symbol carries the first data.

[0073] In a possible implementation of the second aspect, the first information is determined based on at least one of a plurality of information, the plurality of information includes channel quality, the second information, the third information, and the fourth information.

[0074] For example, based on the second device not receiving any of the second information, the third information or the fourth information before sending the first information to the first device, the second device can determine the first information according to the channel quality. The channel quality can be a quality of a first channel used for transmitting the service data.

[0075] For example, based on the second device receiving the target information before sending the first information to the first device, the second device can determine the first information according to at least one of the channel quality and the target information. The target information can include at least one of the second information, the third information or the fourth information introduced above.

[0076] In a possible implementation of the second aspect, the first information is determined based on at least one of the plurality of information, which can be understood as that when a first target condition is met, the first information indicates that the reference symbol carries the first data. The first target condition can include at least one of the following:

[0077] The second device receives the second information sent by the first device, and one or more parameters meet a first condition indicated by the second information;

[0078] The second device receives the third information sent by the first device, and the first device processes the service data in a manner indicated by the third information;

[0079] The second device receives the fourth information sent by the first device, and the fourth information indicates that the first capability is supported; or

[0080] The channel quality meets a channel quality condition.

[0081] In this application, the channel quality is a quality of a channel used for transmitting the service data.

[0082] In a possible implementation of the second aspect, the first information is determined based on at least one of the plurality of information, which can be understood as that when a second target condition is met, the first information indicates that the reference symbol does not carry the first data. The second target condition can be determined based on at least one of the plurality of information introduced above. The second target condition can include at least one of the following:

[0083] The second device does not receive the second information sent by the first device;

[0084] The second device receives the second information sent by the first device, and all or a part of one or more parameters do not meet a first condition indicated by the second information;

[0085] The second device does not receive the third information sent by the first device;

[0086] The second device receives the third information sent by the first device, and the first device processes the service data in a manner indicated by the third information;

[0087] The second device does not receive the fourth information sent by the first device;

[0088] The second device receives the fourth information sent by the first device, and the fourth information indicates that the first capability is not supported; or,

[0089] The channel quality does not satisfy the channel quality condition.

[0090] In a possible implementation of the second aspect, the first information is determined based on at least one of the multiple types of information, and it can be understood that the first information indicates that the reference symbol carries the first data when a third target condition is satisfied. The third target condition can include at least one of the following: the first device supports the first capability, or the channel quality satisfies the channel quality condition.

[0091] In a possible implementation of the second aspect, the first information is determined based on at least one of the multiple types of information, and it can be understood that the first information indicates that the reference symbol does not carry the first data when a fourth target condition is satisfied. The fourth target condition can include at least one of the following: the first device does not support the first capability, or the channel quality does not satisfy the channel quality condition.

[0092] In a possible implementation of the second aspect, the second device determines that the first device supports the first capability when a fifth target condition is satisfied. The fifth target condition can include at least one of the following:

[0093] The second device receives the second information sent by the first device, and one or more parameters satisfy a first condition indicated by the second information;

[0094] The second device receives the third information sent by the first device, and the first device processes the service data in a manner indicated by the third information;

[0095] The second device receives the fourth information sent by the first device, and the fourth information indicates that the first capability is supported.

[0096] In a possible implementation of the second aspect, the second device determines that the first device does not support the first capability when a sixth target condition is satisfied. The sixth target condition can include at least one of the following:

[0097] The second device does not receive the second information sent by the first device;

[0098] The second device receives the second information sent by the first device, and all or a part of one or more parameters do not satisfy a first condition indicated by the second information;

[0099] The second device does not receive the third information sent by the first device;

[0100] The second device receives the third information sent by the first device, and the first device processes the service data in a manner indicated by the third information;

[0101] The second device does not receive the fourth information sent by the first device;

[0102] The second device receives the fourth information sent by the first device, and the fourth information indicates that the first capability is not supported.

[0103] In a third aspect, a communication apparatus is provided. The communication apparatus includes a transceiver. Optionally, the communication apparatus can further include a processing unit.

[0104] In a possible implementation manner of the third aspect, the communication apparatus is configured to perform the method in the first aspect or any implementation manner of the first aspect. Specifically, the transceiver can be configured to perform the sending operation and / or the receiving operation performed by the first device, and the processing unit is configured to perform the internal processing operation performed by the first device. For example, the transceiver is configured to receive the first information sent by the second device, and the processing unit is configured to process the first information, for example, to determine whether the reference symbol carries the first data according to the first information.

[0105] In a possible implementation manner of the third aspect, the communication apparatus is configured to perform the method in the second aspect or any implementation manner of the second aspect. Specifically, the transceiver can be configured to perform the sending operation and / or the receiving operation performed by the second device, and the processing unit is configured to perform the internal processing operation performed by the second device. For example, the processing unit is configured to determine the first information, and the transceiver is configured to send the first information to the first device.

[0106] In a fourth aspect, a communication apparatus is provided. The communication apparatus includes at least one processor configured to execute a computer program stored in a memory to implement the method in the first aspect and any implementation manner of the first aspect, or the processor is configured to execute the computer program stored in the memory to implement the method in the second aspect and any implementation manner of the second aspect.

[0107] Optionally, the communication apparatus further includes the memory. The at least one processor and the memory are coupled.

[0108] In a fifth aspect, the present application provides a chip, comprising a processor, the processor and a memory are coupled, the memory is used to store a computer program, the processor is used to execute the computer program stored in the memory to implement the method in the first aspect and any possible implementation manner of the first aspect, or the processor is used to execute the computer program stored in the memory to implement the method in the second aspect and any possible implementation manner of the second aspect.

[0109] In a sixth aspect, the present application provides a computer readable storage medium, which stores a computer program or instructions, when the computer program or instructions are executed by a processor, the method in the first aspect and any possible implementation manner of the first aspect is executed or the method in the second aspect and any possible implementation manner of the second aspect is executed.

[0110] In a seventh aspect, the present application provides a computer program product comprising instructions which, when executed on a computer, cause the method in the first aspect and any possible implementation manner of the first aspect to be executed or the method in the second aspect and any possible implementation manner of the second aspect to be executed.

[0111] In an eighth aspect, the present application provides a communication system, comprising a first device used to execute the method in the first aspect and any possible implementation manner of the first aspect, and a second device used to execute the method in the second aspect and any possible implementation manner of the second aspect.

[0112] The beneficial effects of the third aspect to the eighth aspect can refer to the beneficial effects of the first aspect to the second aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0113] FIG. 1A is a schematic diagram of an architecture of an orthogonal frequency division multiplexing (OFDM) system;

[0114] FIG. 1B is a schematic diagram of an architecture of a discrete fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) system;

[0115] FIG. 1C is a schematic diagram of an input / output power curve of a power amplifier;

[0116] FIG. 1D is a schematic diagram of a double-symbol demodulation reference signal (DMRS) Type 1;

[0117] FIG. 1E is a schematic diagram of a dual-symbol DMRS Type 2;

[0118] FIG. 1F is a schematic diagram of resource occupation of data and DMRS in one resource block (RB);

[0119] FIG. 1G is a schematic diagram of resource occupation of data and DMRS in one RB;

[0120] FIG. 1H is a schematic diagram of frequency division multiplexing of reference sequence and data using single carrier modulation;

[0121] FIG. 1I schematically shows FDM of Δ = 3 and Δ = 4, respectively;

[0122] FIG. 2 is a schematic diagram of a communication system architecture provided by the present application;

[0123] FIG. 3 is a schematic diagram of a communication method provided by the present application;

[0124] FIG. 4 schematically shows PAPR of a DMRS sequence alone;

[0125] FIG. 5 schematically shows PAPR of a DMRS symbol when DMRS overhead (OH) is 1 / 2, 1 / 3, 1 / 4, 1 / 6;

[0126] FIG. 6 schematically shows a FDM + time division multiplexing (TDM) scheme;

[0127] FIG. 7 schematically shows a scheme of reducing modulation order of frequency- divided data and / or reducing EPRE;

[0128] FIG. 8 shows a schematic diagram of a simplified terminal structure;

[0129] FIG. 9 shows a schematic diagram of a simplified RAN node structure. DETAILED DESCRIPTION

[0130] Before introducing the technical solutions of the present application, the related technical terms involved in the present application are explained and described. It can be understood that these explanations and descriptions are for the purpose of making the present application easier to understand, and should not be regarded as limiting the scope of protection required by the present application.

[0131] 1. Orthogonal frequency division multiplexing (OFDM)

[0132] OFDM is a multi-carrier modulation (MCM) technique. Its core principle is to divide the channel into several orthogonal sub-channels and perform narrowband modulation and transmission on each sub-channel to reduce interference between them. Figure 1A illustrates an example of an OFDM system architecture. In Figure 1A, the data sequence at the transmitting end undergoes sequential processing including serial-to-parallel (S / P), subcarrier mapping, N-point inverse discrete fourier transform (IDFT), parallel-to-serial (P / S), cyclic prefix (CP), and digital-to-analog converter (DAC) before being transmitted as a radio frequency (RF) signal. This signal then reaches the receiving end after transmission through the channel. Accordingly, the signal received by the receiver can be processed sequentially through analog-to-digital converter (ADC), cyclic prefix removal, serial-to-parallel conversion, N-point discrete Fourier transform (DFT), subcarrier demapping / equalization, and parallel-to-serial conversion to obtain the above data sequence.

[0133] Taking a data sequence of S(kM), S(kM+1), ..., S(kM+M-1) as an example, serial-to-parallel conversion can transform the data sequence into an M-dimensional data block, such as S k =[S(kM),S(kM+1),…,S(kM+M-1)] T Where k is the OFDM symbol number, [] T This indicates transpose. S can be achieved through subcarrier mapping. k The M data carried modulate N of the N subcarriers. sc N subcarriers, of which N sc =M, the rest (NN) sc The subcarriers can be understood as being modulated by data 0. After subcarrier mapping, an N-dimensional data vector X can be obtained. k X k After N-point IDFT and parallel-to-serial conversion, a set of N complex time-domain sampling points x can be obtained. k (0),x k (1),…,x k (N-1).

[0134] After parallel-to-serial conversion, the transmitter can insert a guard interval at the start of each OFDM symbol, such as adding a CP at the start of an OFDM symbol, to eliminate inter-symbol interference (ISI) caused by multipath propagation (a phenomenon in which a radio signal takes two or more paths to reach the receiver). Let x k (n) be an example, the transmitter can copy the last G samples of x k (n) and attach them at the start of x k (n) to obtain the time-domain OFDM signal That is, an OFDM symbol contains valid data x k (n) and a CP, which can be regarded as redundant data.

[0135] Correspondingly, after receiving the OFDM signal, the receiver can demodulate the OFDM signal by inverse processing. For example, if time and frequency synchronization can be obtained and the length of the cyclic prefix is sufficient, the receiver can obtain a data block containing N samples without any ISI after performing a de-cyclic prefix operation (such as removing the first G samples of the received signal), and the data block can be equivalent to an OFDM symbol x k convolved with the channel impulse response. Subsequently, the receiver can convert the time-domain convolution into a frequency-domain point multiplication by DFT, and then complete channel equalization with low complexity by using a frequency-domain single-tap equalizer.

[0136] It can be understood that the above data sequence is a sequence obtained after modulating a data signal, so S k may include modulation symbols and / or redundant signal samples. The modulation symbols, which can also be referred to as modulation signals, can be obtained by modulating a (coded) bit stream. The redundant signal samples can include phase tracking reference signal (PTRS) samples, demodulation reference signals, tone reservation signals, and the like.

[0137] It can be understood that if N sc represents the number of subcarriers in the transmission bandwidth, then N sc may be equal to M, and N sc may be greater than M. For example, in this application, a sequence expansion can be performed on S k of length M, and it is assumed that the length of the expanded sequence is equal to N sc .

[0138] 2、Discrete Fourier Transform Spreading OFDM (DFT-s-OFDM)

[0139] DFT-s-OFDM technology is also known as single-carrier OFDM technology or linear precoding OFDM technology, which is a single-carrier technology based on OFDM waveform, and can also be understood as a modulation mode for realizing single-carrier waveform by using multiple carriers. The difference between DFT-s-OFDM and OFDM is that the sending end can perform DFT before performing subcarrier mapping, and through this operation, the DFT-s-OFDM signal can have single-carrier characteristics. Correspondingly, the receiving end can perform IDFT after performing de-subcarrier mapping. For example, FIG. 1B shows a schematic diagram of the architecture of a DFT-s-OFDM system. In FIG. 1B, the data sequence can be sent out in the form of a radio frequency signal after being processed by the sending end in sequence through serial-parallel conversion, M-point DFT, subcarrier mapping, N-point IDFT, parallel-serial conversion, adding a cyclic prefix, and digital-to-analog conversion. After channel transmission, the signal reaches the receiving end. Correspondingly, the signal received by the receiving end can be processed in sequence through analog-to-digital conversion, de-cyclic prefix, serial-parallel conversion, N-point DFT, de-subcarrier mapping, M-point IDFT, and parallel-serial conversion to obtain the above-mentioned data sequence. Among them, the M-dimensional data block S k The modulation symbols and / or the redundant signal sampling points can be included. The modulation symbols can be obtained by modulating the (encoded) bit stream. The redundant signal sampling points can include PTRS sampling points, unique words, zeros, etc.

[0140] 3、Modulation mode

[0141] The data sequence in the above-mentioned FIG. 1A and FIG. 1B is obtained after modulation. In specific applications, there are various modulation modes, for example, the modulation modes include pulse amplitude modulation (PAM), frequency shift keying (FSK), phase shift keying (PSK), BPSK, Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (QAM), Amplitude Phase Shift Keying (APSK), Offset Quadrature Amplitude Modulation (OQAM), etc. Among them, QSPK can also be referred to as 4QAM.

[0142] For example, the i-th bit b(i) in the bit stream can be mapped into the i-th BPSK symbol d(i) according to the following relationship:

[0143] For example, the i-th bit b(i) in the bit stream can be mapped into the i-th BPSK symbol d(i) according to the following relationship: For example, the i-th bit b(i) in the bit stream can be mapped into the i-th BPSK symbol d(i) according to the following relationship: For example, the i-th bit b(i) in the bit stream can be mapped into the i-th BPSK symbol d(i) according to the following relationship: As can be seen from the above mapping relationship, adjacent two symbols in the symbol sequence have a phase jump of 90 degrees.

[0144] For example, the 2i-th bit b(2i) and the 2i+1-th bit b(2i+1) in the bit stream can be mapped into the i-th QPSK symbol d(i) according to the following relationship:

[0145] For example, the 4i-th bit b(4i), the 4i+1-th bit b(4i+1), the 4i+2-th bit b(4i+2) and the 4i+3-th bit b(4i+3) in the bit stream can be mapped into the i-th 16QAM symbol d(i) according to the following relationship:

[0146] ​​​It should be understood that the above are only some examples of mapping bits in a bitstream to symbols. In specific applications, there can also be other mapping relationships / realizations / methods. Taking BPSK modulation as an example, the i-th bit b(i) in the bitstream can also be mapped to the i-th BPSK symbol d(i) according to the following relationship: where ε is a constant.

[0147] 4. Nonlinear characteristics of a power amplifier (PA)

[0148] Before a signal is transmitted through an antenna, the signal power is boosted by a power amplifier. Generally, the behavior of a power amplifier is described by the amplitude modulation-amplitude modulation (AM-AM) characteristics of the power amplifier. For example, FIG. 1C shows an AM-AM curve of a power amplifier, which describes the functional relationship between the output power of the power amplifier and its input power. Within a linear region, the output power of the power amplifier increases linearly with the input power, that is, the gain of the power amplifier (e.g., the ratio of the output power of the power amplifier to the input power) remains unchanged, or the slope of the AM-AM curve remains unchanged. As the input power continues to increase, the power amplifier enters a nonlinear region, and the output power no longer increases linearly with the input power, the gain of the power amplifier is compressed, and the slope of the AM-AM curve decreases. When the saturation output power is reached, the output power of the power amplifier no longer increases with the input power, and the slope of the AM-AM curve is 0. As can be seen, within the nonlinear region, the power amplifier has nonlinear characteristics.

[0149] Such nonlinear characteristics of the power amplifier can cause in-band distortion and out-of-band distortion of the transmitted signal. Among them, the in-band distortion mainly manifests as distortion in amplitude and phase, which can deteriorate the signal demodulation / detection performance. The out-of-band distortion mainly manifests as signal spectrum expansion / regeneration, which can increase the interference to adjacent channel users. Therefore, in order to alleviate the nonlinear effects of the power amplifier, the power of the input signal can be appropriately reduced, such as input power backoff (IBO) or output power backoff (OBO), so that the power amplifier works as much as possible within the linear region, which is a method at the expense of reducing the efficiency of the power amplifier.

[0150] 5. Peak to average power ratio (PAPR)

[0151] PAPR is the ratio of the peak power to the average power of a signal in a period of time. The unit of PAPR can be dB. For example, if the peak power of a signal x(t) in the period of t0~t1is The average power of the signal x(t) is The PAPR of the signal satisfies the following relationship:

[0152] It can be understood that a communication signal (such as an OFDM signal or a DFT-s-OFDM signal) is a random signal, and its average power can be regarded as a fixed value, and its peak power is indeed a random variable. Therefore, the PAPR of the communication signal is also a random variable. In statistics, the value of a random signal at a certain time is often described by a probability density function. Therefore, in the communication industry, engineers often use a complementary cumulative distribution function (CCDF) curve to describe the PAPR, for example, the probability that the instantaneous power exceeds the average power by xx dB is yy, or the proportion of time that the instantaneous power exceeds the average power by xx dB is yy. Specifically, it can be described by the following relationship:

[0153] Where P(·) represents probability.

[0154] It can be understood that the higher the PAPR of the input signal of the power amplifier, the greater the range of input power fluctuation, and the more power value needs to be backed off to ensure that the input / output signal is in the linear region. Therefore, designing a signal with low PAPR can reduce the input / output power backoff of the power amplifier, improve the signal transmission power, and improve the signal coverage.

[0155] Single-carrier signals have much lower PAPR than multi-carrier signals. For example, the PAPR of a DFT-s-OFDM signal with single-carrier characteristics is much lower than that of an OFDM signal. Under the same power amplifier, a DFT-s-OFDM signal can provide greater output power and higher power amplifier efficiency, thereby achieving the purpose of improving coverage and reducing energy consumption.

[0156] 6、Port

[0157] Port can also be called antenna port, which is a logical concept. One antenna port can correspond to one physical transmitting antenna or multiple physical transmitting antennas. In both cases, the receiver of the terminal does not decompose the signal from the same antenna port. Because from the perspective of the terminal, whether the channel is formed by a single physical transmitting antenna or combined by multiple physical transmitting antennas, the reference signal (RS) corresponding to the antenna port defines the antenna port, for example, the DMRS port corresponding to the de-modulation reference signal (DMRS). The terminal can obtain the channel estimation of the antenna port according to the reference signal. Each antenna port corresponds to a time / frequency resource grid and has its own reference signal. One antenna port is one channel, and the terminal performs channel estimation and data demodulation according to the reference signal corresponding to the antenna port.

[0158] 7. Reference signal

[0159] The reference signal is a known signal, also known as a pilot, which can be provided by the sending end to the receiving end. Because the information may change (noise, fading, etc.) in the transmission channel, it may cause the received information to be different from the sent information. In order to accurately restore the correct information, it is necessary to understand which changes the information has undergone in the transmission process, so the reference signal (RS) is introduced.

[0160] The sending end and the receiving end agree on a known signal (denoted as RS) in advance. The RS is transmitted together with the information to be sent in the transmission channel. After receiving the signal (denoted as RS'), the receiving end can understand the changes of the information in the transmission channel by comparing the difference between RS and RS', perform channel characteristic estimation, and obtain the channel characteristic H. According to the channel characteristic H, the received information can be restored to the correct sent information.

[0161] The reference signal can be used for channel estimation, channel sounding, or target perception, etc. According to the transmission direction, the reference signal can be divided into uplink reference signal and downlink reference signal.

[0162] The uplink reference signal refers to a signal sent by a terminal to a RAN node, for example, the uplink reference signal includes a DMRS or a sounding reference signal (SRS), etc. The uplink reference signal can be used for uplink channel estimation (such as coherent demodulation and detection of the RAN node or for calculating precoding), uplink channel quality measurement or target sensing. The downlink reference signal refers to a signal sent by the RAN node to the terminal, for example, the downlink reference signal includes a DMRS or a channel state information reference signal (CSI-RS) or a tracking reference signal (TRS), etc. The downlink reference signal can be used for downlink channel estimation, downlink channel measurement or target sensing.

[0163] It can be understood that the reference signal mentioned in the present application can be any of the above reference signals, that is, the method provided by the present application can be applied to any of the above reference signals. In order to better understand the method provided by the present application, the following embodiments of the present application will be described by taking the DMRS as an example. First, the related concepts of DMRS are briefly described below.

[0164] When considering space division multiplexing, that is, simultaneously transmitting multiple data streams, the data streams occupy the same time-frequency resources and different spatial resources. The spatial resources are divided into "layers", each layer corresponds to a data stream and is mapped to a logical "antenna port". Each antenna port corresponds to a time-frequency resource grid and has a corresponding DMRS, that is, the time-frequency resource grid carries both the DMRS and the service data, so that the receiving end can perform channel estimation and coherent demodulation of the service data. In order to ensure the quality of channel estimation, the DMRSs on different antenna ports are orthogonal in the frequency domain or code domain.

[0165] In the time domain, the DMRS can occupy 1 symbol or 2 symbols, so the DMRS can be divided into single-symbol DMRS and double-symbol DMRS. In the frequency domain, according to the maximum number of antenna ports supported, the DMRS can be divided into Type 1 and Type 2. For Type 1, the DMRS is comb-shaped in the frequency domain, and the DMRS ports can be divided into two code division multiplexing (CDM) groups, and the ports within the group are code division multiplexed. For example, a single-symbol DMRS supports a maximum of 4 antenna ports, which are divided into two CDM groups {1000, 1001} and {1002, 1003}; a double-symbol DMRS supports a maximum of 8 antenna ports, which are divided into two CDM groups {1000, 1001, 1004, 1005} and {1002, 1003, 1006, 1007}.

[0166] For example, FIG. 1D shows the time-frequency resource occupied by double-symbol DMRS Type 1. In time direction, one slot contains 14 symbols (e.g., symbol 0-symbol 13) under normal cyclic prefix. In frequency direction, one RB contains 12 subcarriers (e.g., subcarrier 0-subcarrier 11). One resource element (RE) corresponds to 1 symbol in time direction and 1 subcarrier in frequency direction. In FIG. 1D, one antenna port has 6 REs in one RB for transmitting DMRS. In the time-frequency resource grid corresponding to 1 symbol and 1 RB, the first CDM group occupies even-indexed subcarriers, e.g., subcarrier 0, subcarrier 2, subcarrier 4, subcarrier 6, subcarrier 8 and subcarrier 10, and the second CDM group occupies odd-indexed subcarriers, e.g., subcarrier 1, subcarrier 3, subcarrier 5, subcarrier 7, subcarrier 9 and subcarrier 11. In FIG. 1D, symbol 0 and symbol 1 can represent PDCCH respectively, and symbol 4-symbol 13 can represent PDSCH or PUSCH respectively.

[0167] Compared with Type 1, Type 2 can reduce the frequency domain density of DMRS. At this time, one antenna port has 4 REs in one RB for transmitting DMRS. For Type 2, DMRS ports can be divided into three CDM groups, and ports in a group are multiplexed by code division. For example, single-symbol DMRS supports a maximum of 6 antenna ports, which are divided into {1000, 1001}, {1002, 1003} and {1004, 1005} three CDM groups. Double-symbol DMRS supports a maximum of 12 antenna ports, which are divided into {1000, 1001, 1006, 1007}, {1002, 1003, 1008, 1009} and {1004, 1005, 1010, 1011} three CDM groups.

[0168] For example, FIG. 1E shows the time-frequency resource occupied by double-symbol DMRS Type 2. In the time-frequency resource grid corresponding to 1 symbol and 1 RB, the first CDM group occupies subcarriers with indexes 0, 1, 6 and 7, the second CDM group occupies subcarriers with indexes 2, 3, 8 and 9, and the third CDM group occupies subcarriers with indexes 4, 5, 10 and 11. In FIG. 1E, symbol 0 and symbol 1 can represent PDCCH respectively, and symbol 4-symbol 13 can represent PDSCH or PUSCH respectively.

[0169] From the above description, it can be seen that for a single CDM group or a single port, whether it is Type 1 or Type 2, it occupies part of the subcarriers in one RB. Taking FIG. ID as an example, the subcarrier indexes occupied by port 1000 are 0, 2, 4, 6, 8, and 10. In order to describe whether the subcarriers in 1 RB that do not carry DMRS are empty or carry data (such as whether they carry a physical downlink shared channel (PDSCH)), the communication system defines a parameter "number of DMRS CDM groups without data". Under different number of DMRS CDM groups without data, the function description of the subcarriers in 1 RB can be as shown in Table 1.

[0170] Table 1

[0171] In the communication system, if the subcarriers are empty, the power allocated to the empty subcarriers can be superimposed on the DMRS sequence. For example, for type 1, the indexes of the subcarriers occupied by port 1000 are 0, 2, 4, 6, 8, and 10, that is, these subcarriers carry DMRS sequences, and if the number of DMRS CDM groups without data = 2, the power superimposition mode is that the DMRS sequence power is increased by 1 times (or 3 dB), which is beneficial to improve the channel estimation performance.

[0172] In addition, the communication system also defines the concepts of DMRS energy per resource element (EPRE), PDSCH EPRE, and physical uplink shared channel (PUSCH) EPRE, and gives the ratio of PDSCH / PUSCH EPRE to DMRS EPRE, which is related to the number of DMRS CDM groups without data, as shown in Table 2.

[0173] Table 2

[0174] If the resource pattern occupied by DMRS and PDSCH is as shown in FIG. 1F, the PDSCH EPRE is the same as the DMRS EPRE, and thus the ratio of the two is 1, i.e. 0 dB. If the resource pattern occupied by DMRS and PDSCH is as shown in FIG. 1G, the PDSCH EPRE is 0.5 times the DMRS EPRE, and thus the ratio of the two is 0.5, i.e. -3 dB.

[0175] In some embodiments, e.g. in NR, PUSCH supports two waveforms: OFDM waveform and DFT-s-OFDM waveform. PDSCH supports OFDM waveform, but does not support DFT-s-OFDM waveform. Table 3 shows the relationship between the number of DMRS CDM groups without data and the waveform under different DMRS types.

[0176] Table 3

[0177] As can be seen from Table 3, when the OFDM waveform is used, the DMRS sequence and data are allowed to be frequency division multiplexed (FDM), and when the DFT-s-OFDM waveform is used, the DMRS sequence and data are not allowed to be FDM.

[0178] It is pointed out here that in NR, when the OFDM waveform is used, the DMRS sequence is a sequence of QPSK symbols. In addition, when the PUSCH uses the DFT-s-OFDM waveform, the DMRS sequence is generated based on a base sequence, and type 1 DMRS is supported. In some embodiments, when the data uses modulation and the length of the base sequence is greater than or equal to 30, the base sequence is obtained by performing DFT on the sequence.

[0179] Since when the DFT-s-OFDM waveform is used, the related art does not allow the DMRS symbol to carry data, this way will result in low spectral efficiency. Therefore, it is proposed that the DMRS symbol carries single-carrier data, wherein the single-carrier data and the DMRS sequence are frequency division multiplexed.

[0180] As shown in FIG. 1H, the reference sequence and the data using single-carrier modulation are allowed to be frequency division multiplexed. For example, the subcarriers carry the DFT or DFT spread result of the sequence of pi / 2-BPSK / QPSK / QAM symbols. Optionally, the DMRS sequence can also use other low-PAPR sequences other than the QPSK symbol sequence, such as the Zadoff-Chu (ZC) sequence. Some specific implementations of this concept are described below.

[0181] It is assumed that pilots are uniformly inserted in the frequency domain resource with density (or overhead) 1 / Δ, i.e., there is a pilot every (Δ-1) subcarriers. Single carrier data is placed on the other remaining subcarriers. For DMRS type 1, pilots are uniformly inserted in the frequency domain resource with density 1 / 2, i.e., there is a pilot every 1 subcarrier, while data is placed in between the pilots. FIG. II schematically shows FDM for Δ = 3 and Δ = 4.

[0182] It should be appreciated that, in the case of satisfying the density 1 / Δ, the pilots can also be placed in the form of pilot blocks. Each pilot block contains pilots. The distance between two adjacent pilot blocks is For example, DMRS type 2, as can be seen in conjunction with FIG. IE, the DMRS density is 1 / 3, and for a single port, it contains 2 pilot blocks in one RB. Each pilot block contains 2 pilots. The distance between two pilot blocks is 6. For example, DMRS port 1000 occupies subcarriers 0, 1, 6, 7 of one RB. Subcarriers 0 and 1 form pilot block 1, and subcarriers 6 and 7 form pilot block 2. It should be appreciated that uniformly placing pilots is beneficial for obtaining better channel estimation performance, while placing pilots in the form of pilot blocks is beneficial for enhancing multi-user multiplexing capability. It is assumed that the subcarrier index in the transmission bandwidth starts from 0, and the subcarrier index corresponding to the 0th pilot subcarrier is denoted as δ, where δ is an integer in the set It should be appreciated that in the schemes shown in FIG. IF, FIG. 1G, and FIG. II, δ = 0.

[0183] The use of the scheme shown in FIG. 1H is limited. For example, the limitation can be explained from the perspective of PAPR. When the PUSCH contains multiple symbols, in this multi-symbol scenario, it is required that the PAPR of the DMRS symbol should not be higher than that of the data symbol (carrying only data, such as other symbols in FIG. IF or FIG. 1G except the second symbol). If this requirement is not met, the DMRS symbol will have a larger OBO than the data symbol, and if the loss of this additional OBO exceeds the spectral efficiency or capacity gain brought by the DMRS symbol carrying data, the DMRS symbol will not be allowed to carry data in this case. It should be appreciated that if the UE supports DMRS symbol PAPR reduction processing, the use scenario of the DMRS symbol carrying data is more. In addition, the limitation can also be explained from the perspective of UE processing complexity. It should be appreciated that allowing the DMRS symbol to carry data will increase the processing complexity of the UE, such as the DFT used when processing the data carried in the DMRS symbol and the DFT used when processing the data symbol are different, so the UE can not support the DMRS symbol carrying data due to complexity.

[0184] In summary, although allowing single-carrier data and reference signal frequency division multiplexing is beneficial to improve spectral efficiency, whether the terminal uses this feature is related to the capability of the terminal.

[0185] To this end, the present application provides a communication method. It is proposed according to the UE capability to determine whether to do DMRS sequence and single-carrier data frequency division multiplexing, or in other words, according to the UE capability, the application of reference signal and single-carrier data FDM is differentiated.

[0186] The method provided by the present application can be used in various communication systems. For example, the communication system can be a universal mobile telecommunications system (UMTS) system, a long term evolution (LTE) system, a 5th generation (5G) communication system, a wireless fidelity (WiFi) system, a 3rd generation partnership project (3GPP) related communication system, a communication system evolved after 5G or a system integrated with multiple systems, etc., without limitation. Among them, 5G can also be referred to as new radio (NR), a communication system evolved after 5G or a future communication system, such as a 6th generation mobile communication system. The present application can also be applied to device to device (D2D) communication, vehicle-to-everything (V2X) communication, machine to machine (M2M) communication, machine type communication (MTC), and internet of things (IoT) communication system or other communication systems. The method provided by the present application will be described below taking the communication system 1000 shown in FIG. 2 as an example. FIG. 2 is only a schematic diagram and does not constitute a limitation on the applicable scenarios of the technical solutions provided by the present application.

[0187] As shown in FIG. 2, it is an architecture schematic diagram of the communication system 1000 provided by the present application. In FIG. 2, the communication system 1000 includes a RAN 100. The RAN 100 includes at least one RAN node (such as 110a and 110b in FIG. 2, collectively referred to as 110) and at least one terminal (such as 120a-120j in FIG. 2, collectively referred to as 120). The RAN 100 can also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in FIG. 2), etc. The terminal 120 is connected to the RAN node 110 in a wireless manner.

[0188] The RAN 100 can be a 3GPP related cellular system, e.g., a 4G, 5G mobile communication system, or a future evolution system. The RAN 100 can also be an open radio access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a WiFi system. The RAN 100 can also be a communication system that combines two or more of the above systems.

[0189] The RAN node 110, which can also be referred to as an access network device, RAN entity, network device, or access node, etc., forms part of the communication system, and is configured to facilitate wireless access to the communication system by terminals. The plurality of RAN nodes 110 in the communication system 1000 can be of the same type or of different types.

[0190] In one possible scenario, the RAN node can be a base station. The base station can cover a wide range of various names or be replaced by various names such as: Node B, evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master eNodeB (MeNB), secondary eNodeB (SeNB), multi standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, base band unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. in a broad sense. The base station can be a macro base station, micro base station, relay node, donor node or the like, or a combination thereof. The base station can also refer to a communication module, modem or chip used in the aforementioned equipment or device. The base station can also be a mobile switching center and a device assuming the function of a base station in D2D, V2X, M2M communication, a network side device in 6G network, a device assuming the function of a base station in future communication system, etc. The base station can support networks of the same or different access technologies. The present application does not limit the specific technology and specific equipment form adopted by the RAN node.

[0191] The base station can be fixed or mobile. For example, a helicopter or a drone can be configured to act as a mobile base station, and one or more cells can move according to the location of the mobile base station. In other examples, the helicopter or the drone can be configured to serve as a device communicating with another base station.

[0192] In another possible scenario, a terminal is assisted by multiple RAN nodes to implement wireless access, and different RAN nodes respectively implement part of functions of a base station. Specifically, a RAN node can be a central unit (CU), a distributed unit (DU), or a radio unit (RU), etc. For example, a CU can complete functions of a radio resource control (RRC) layer and functions of a packet data convergence protocol (PDCP) layer of a base station. The CU can also complete functions of a service data adaptation protocol (SDAP) layer. A DU can complete functions of a radio link control (RLC) layer and functions of a medium access control (MAC) layer of a base station. The DU can also complete functions of part of a physical layer or all of a physical layer. An RU can be used to implement functions of transceiving radio frequency signals. The CU and the DU can be separately arranged, or can be included in the same network element, for example, a baseband unit (BBU). The RU can be included in a radio frequency device or a radio frequency unit, for example, included in a remote radio unit (RRU), an active antenna processing unit (AAU), or a remote radio head (RRH). In addition, the CU can be further divided into a CU-control plane (CP) and a CU-user plane (UP).

[0193] In different systems, the CU (or CU-CP and CU-UP), the DU, or the RU can also have different names, but those skilled in the art can understand their meanings. For example, in an ORAN system, the CU can also be referred to as an O-CU (open CU), the DU can also be referred to as an O-DU, the CU-CP can also be referred to as an O-CU-CP, the CU-UP can also be referred to as an O-CU-UP, and the RU can also be referred to as an O-RU. For the convenience of description, the CU, the CU-CP, the CU-UP, the DU, and the RU are taken as examples for description in this application. Any one of the CU (or the CU-CP, the CU-UP), the DU, and the RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0194] The terminal 120 is a device with wireless transceiving function. The terminal can also be referred to as a terminal device, which can be a user equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device. The terminal device can be a device that provides voice / data connectivity to a user, such as a handheld device with wireless connection function, a vehicle-mounted device, etc. Currently, some examples of the terminal are: a mobile phone, a tablet computer, a notebook computer, a palm computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in autonomous driving, a wireless terminal in emote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved public land mobile network (PLMN), etc. The embodiments of the present application are not limited thereto. In vehicle-to-everything (V2X) communication, a communication terminal carried by a vehicle is a terminal device, and a road side unit (RSU) can also be a terminal device. A communication terminal carried by a drone can also be regarded as a terminal device. The terminal can also be other devices with terminal functions, for example, the terminal can also be a device that plays a terminal function in device-to-device (D2D) communication.

[0195] By way of example, and without limitation, a terminal in the present application can be a wearable device. A wearable device can also be referred to as a wearable smart device, which is a general term for devices that apply wearable technology to the design and development of smart wearables, such as glasses, gloves, watches, clothing, and shoes, etc. A wearable device is a portable device that is directly worn on the body or integrated into the clothes or accessories of a user. For example, a wearable device is not only a hardware device, but also a device that realizes powerful functions through software support and data interaction and cloud interaction. Broadly, a wearable smart device includes devices with full functions and large sizes that can realize complete or partial functions without relying on a smart phone, such as smart watches or smart glasses, and devices that focus on a certain type of application function and need to be used in cooperation with other devices, such as smart phones, such as various types of smart wristbands and smart jewelry for monitoring vital signs.

[0196] In the present application, a terminal can be a terminal in an internet of things (IoT) system, which is an important part of future information technology development, and its main technical feature is to connect objects through communication technology and network to realize the intelligent network of man-machine interconnection and object-object interconnection. The terminal in the present application can be a terminal in machine type communication (MTC).

[0197] The terminal of the present application can be a vehicle-mounted module, a vehicle-mounted module group, a vehicle-mounted component, a vehicle-mounted chip, an on-board unit (OBU), or a telematics box (T-BOX) built into a vehicle as one or more components or units, and the vehicle can implement the method of the present application through the built-in vehicle-mounted module, vehicle-mounted module group, vehicle-mounted component, vehicle-mounted chip, on-board unit, or T-BOX. The terminal can also be a whole vehicle device. Therefore, the present application can be applied to the Internet of Vehicles, such as V2X, long term evolution vehicle (LTE-V), vehicle to vehicle (V2V), etc.

[0198] The RAN node and the terminal can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on the water surface; and can also be deployed on airplanes, balloons, and satellites in the air. The present application does not limit the scenarios in which the RAN node and the terminal are located.

[0199] It can be understood that the communication system 1000 shown in FIG. 2 is merely used for example and is not used to limit the technical solutions of the present application. It should be understood by those skilled in the art that, in the actual implementation process, the communication system 1000 can also include other devices, and the number of RAN nodes and terminals can also be determined according to the specific needs, and is not limited.

[0200] The method provided by the present application will be described below with reference to the drawings. It can be understood that, in the present application, the RAN node and / or the terminal can perform part or all of the steps in the present application, and these steps are only examples, and the present application can also perform other steps or variations of various steps. In addition, the various steps can be performed in different orders presented in the present application, and it is possible that not all steps in the present application are performed.

[0201] It can be understood that the RAN node and the terminal are taken as an example to illustrate the method in the method provided by the present application below, but the present application does not limit the execution subject of the interaction. For example, the RAN node in the method provided by the embodiments of the present application can also be a chip, a chip system, or a processor supporting the RAN node to implement the method, and can also be a logical node, a logical module or software capable of implementing all or part of the functions of the RAN node; the terminal in the method provided by the present application below can also be a chip, a chip system, or a processor supporting the terminal to implement the method, and can also be a logical node, a logical module or software capable of implementing all or part of the functions of the terminal.

[0202] As shown in FIG. 3, a communication method provided by the present application can include S301-S303.

[0203] S301, the terminal sends a first message to the RAN node, and correspondingly, the RAN node receives the first message sent by the terminal;

[0204] As introduced before, the first device can send second information to the second device. In the present application, the first device can be a terminal, and the second device can be a wireless access device (for example, a RAN node). Optionally, the first message includes the second information. The second information can be understood with reference to the related content before. For example, the second information indicates a first condition, and the first condition is related to a first capability. The first capability includes that the reference symbol carries the first data, and the first data adopts single carrier modulation.

[0205] As introduced above, the first device can send the third information to the second device. Optionally, the first message comprises the third information. The third information can be understood with reference to the related content above. For example, the third information indicates a capability of the first device, or the third information indicates whether the first device supports pi / 2-binary phase shift keying (BPSK), or the third information indicates whether the first device supports the first processing manner.

[0206] As introduced above, the first device can send the fourth information to the second device. Optionally, the first message comprises the fourth information. The fourth information can be understood with reference to the related content above. For example, the fourth information indicates whether the first capability is supported or not.

[0207] Optionally, the first message comprises at least two of the second information, the third information or the fourth information.

[0208] The application does not limit the manner in which the terminal sends the first message. For example, the terminal can encapsulate the first message in the same data frame. Alternatively, the terminal can encapsulate the first message in multiple data frames, and the second information, the third information or the fourth information can be encapsulated in the same or different data frames.

[0209] S302, the RAN node sends a second message to the terminal, and correspondingly, the terminal receives the second message sent by the RAN node;

[0210] As introduced above, the first device receives the first information sent by the second device, and correspondingly, the second device sends the first information to the first device. The second message can comprise the first information. The first information can be understood with reference to the related content above. For example, the first information indicates that the reference symbol carries the first data, or the first information indicates that the reference symbol does not carry the first data, wherein the first data adopts single carrier modulation.

[0211] The RAN node can determine the first information according to the first message, and then send the second message. In this way, it is beneficial for the RAN node to determine whether the reference symbol carries the first data based on the first message sent by the terminal. Possible implementation manners of the RAN node determining the first information according to the first message will be introduced hereinafter, which will not be described here.

[0212] Step S301 is an optional step. For example, in some examples, the terminal can not send the first message to the RAN node, and correspondingly, the RAN node does not determine the first information according to the first message sent by the terminal. As an example, the RAN node can be pre-configured with the first message corresponding to the terminal, and determine the first information according to the pre-stored first message. Alternatively, as an example, the RAN node can obtain the subscription information of the terminal from a core network element, and the subscription information of the terminal comprises the first message.

[0213] The second message comprises the first information. It can be understood that the second message carries the first information. The application does not limit the type of the second message. Optionally, the second message is a downlink control information (DCI), a radio resource control (RRC) message, or a medium access control control element (MAC-CE).

[0214] Optionally, the second message can also comprise other information. For example, the other information can comprise scheduling information. Hereinafter, the second message is taken as an example of also comprising scheduling information.

[0215] The application does not limit the manner in which the RAN node sends the second message. For example, the terminal can encapsulate the second message in the same data frame. Alternatively, the terminal can encapsulate the second message in multiple data frames, and the first information and the other information can be encapsulated in the same or different data frames.

[0216] S303. The terminal processes the reference symbol and the data symbol according to the second message.

[0217] The terminal processing the reference symbol and the data symbol can comprise the terminal sending the reference symbol and the data symbol, or receiving the reference symbol and the data symbol.

[0218] Optionally, based on the first information indicating that the reference symbol carries the first data, the reference symbol processed by the terminal according to the second message can carry the first data, and correspondingly, the service data processed by the terminal can comprise the first data in the reference symbol and the second data in the data symbol. As introduced previously, the second data is modulated by using a single carrier. Optionally, based on the first information indicating that the reference symbol does not carry the first data, the reference symbol processed by the terminal according to the second message can not carry the first data, and correspondingly, the service data processed by the terminal can comprise the second data in the data symbol.

[0219] The terminal can process the reference symbol and the data symbol on the time-frequency resource scheduled by the RAN node for the terminal. The time-frequency resource can be used for communication between the terminal and the RAN node, or used for communication between the terminal and other devices (such as other terminals) other than the RAN node.

[0220] S303 is an optional step. The application does not limit the terminal processing the reference symbol and the data symbol according to the second message after receiving the second message. In some examples, the terminal can process the reference symbol according to the second message after receiving the second message. Optionally, based on the first information indicating that the reference symbol carries the first data, the reference symbol processed by the terminal according to the second message can carry the first data. Optionally, based on the first information indicating that the reference symbol does not carry the first data, the reference symbol processed by the terminal according to the second message can not carry the first data.

[0221] Hereinafter, a possible implementation manner of the RAN node determining the first information is introduced.

[0222] The RAN node can determine the first information according to one or more information, and then send the second message to the terminal. The one or more information can include at least one of the information in the first message, and / or other information than the first message. For example, the other information can include a channel quality. The channel quality can be a quality of a first channel used for transmitting the service data.

[0223] In some examples, the first information indicates that the reference symbol carries the first data when a first target condition is satisfied. The first target condition can include at least one of: the RAN node receives the second information sent by the terminal, and one or more parameters satisfy a first condition indicated by the second information; the RAN node receives third information sent by the terminal, and the terminal supports processing the service data in a manner indicated by the third information; the RAN node receives fourth information sent by the terminal, and the fourth information indicates that the first capability is supported; or a channel quality satisfies a channel quality condition.

[0224] As introduced before, the first condition is related to the first capability, which includes that the reference symbol carries the first data. The first condition being related to the first capability can be understood as that whether the first condition is satisfied is related to whether the first device supports the first capability or whether the reference symbol carries the first data.

[0225] As introduced before, the one or more parameters can include a modulation order of the second data, which can be understood as that the first capability is related to the modulation order of the second data. For example, when the modulation order of the second data is greater than a modulation order of a modulation scheme (such as 16QAM and above), the terminal supports the first capability. Optionally, the first condition indicated by the second information includes a threshold of the modulation order. After the RAN node receives the second information and determines the threshold of the modulation order indicated by the second information, if the subsequently scheduled PUSCH uses a modulation scheme with a modulation order greater than the threshold (such as 16QAM and above), the RAN node sends the first information to the terminal to indicate that the reference symbol carries the first data in addition to sending the PUSCH scheduling information (including time-frequency resources, etc.) to the terminal. If the subsequently scheduled PUSCH uses a modulation scheme with a modulation order lower than the threshold (such as QPSK), the RAN node sends the first information to the terminal to indicate that the reference symbol carries the first data in addition to sending the PUSCH scheduling information (including time-frequency resources, etc.) to the terminal.

[0226] As introduced above, the one or more parameters comprise MCS of the second data, which can be understood as the first capability is related to the MCS. For example, the terminal supports the first capability when the MCS of the second data is greater than a certain threshold (which can be denoted as PuschDmrsFdmThld). Optionally, the first condition indicated by the second information comprises the threshold of the MCS. After the RAN node receives the second information and determines the threshold of the MCS indicated by the second information, if the MCS index of the subsequently scheduled PUSCH is greater than PuschDmrsFdmThld, the RAN node sends the first information to the terminal to indicate that the reference symbol carries the first data in addition to sending the PUSCH scheduling information (including time-frequency resources, etc.) to the terminal. If the MCS index of the subsequently scheduled PUSCH is less than PuschDmrsFdmThld, the RAN node sends the first information to the terminal to indicate that the reference symbol does not carry the first data in addition to sending the PUSCH scheduling information (including time-frequency resources, etc.) to the terminal.

[0227] The effect of the first capability and the modulation order or MCS of the second data is introduced below.

[0228] First, the effect is analyzed from the perspective of demodulation gain. The reference symbol carrying the first data enables more REs to be used for transmitting data, which can reduce the code rate (CR) under a given load (or the amount of information bits to be transmitted). Given a certain degree of code rate reduction, such as the code rate when using the first capability being 0.9 times the code rate when not using the first capability, the higher the modulation order of the second data or the greater the MCS index, the greater the demodulation gain brought by the code rate reduction.

[0229] Consider that the transmission bandwidth is 270 RBs, the PUSCH includes two symbols, one of which is a DMRS symbol (type 1 DMRS) and the other is a data symbol. Table 4 below shows the demodulation signal-to-noise ratio (block error rate is 10%, and the channel is a tapped delay line-C with a delay spread of 220 ns) gain brought by using the reference symbol to carry the first data under different MCS indexes. The MCS table is referred to 3GPP TS 38.214 6.1.4.1-1.

[0230] Table 4

[0231] As can be seen from Table 4, the greater the MCS index value, the greater the gain brought by using the reference symbol to carry the first data.

[0232] Next, the effect is analyzed from the PAPR perspective. Because the lower the modulation order, the lower the PAPR of the data symbol using the DFT-s-OFDM waveform, such as the PAPR of the 16QAM DFT-s-OFDM signal is lower than that of the QPSK DFT-s-OFDM signal. The lower the modulation order (or the lower the PAPR of the data symbol), the more difficult it is to ensure that the PAPR of the DMRS symbol does not exceed that of the data symbol, i.e., the use scenario of the DMRS symbol carrying the first data is more limited.

[0233] As introduced above, optionally, the one or more parameters include a Zadoff-Chu (ZC) sequence root of the reference signal sequence (or RS sequence). It can be understood that the DMRS sequence can use the ZC sequence, and in this case, the first capability is related to the Zadoff-Chu (ZC) sequence root of the reference signal sequence. The following formula gives the M ZC Implementation of long DMRS sequence:

[0234] where N ZC is the largest prime number less than M ZC , and q is the root of the ZC sequence, which is coprime with N ZC , and mod represents the modulo operation, such as 5 mod 2 = 1. The value of q can be calculated by some higher-layer parameters. The higher-layer parameters include nPUSCH-Identity, the state (‘enabled’ or ‘disabled’) of group hopping and sequence hopping, etc.

[0235] Looking at the PAPR of the DMRS sequence or the DMRS symbol carrying only the DMRS sequence, it is related to q. Considering M ZC = 72, FIG. 4 shows the PAPR of the DMRS sequence. It can be seen that the PAPR changes with the value of q.

[0236] Because applying the first capability will worsen the PAPR, i.e., the PAPR of the DMRS symbol carrying the DMRS sequence and the first data in the FDM manner is worse than that of the DMRS symbol carrying only the DMRS sequence. Thus, if the PAPR of the DMRS symbol carrying only the DMRS sequence is already comparable to or worse than that of the data symbol, the first capability cannot be applied, otherwise the PAPR of the DMRS symbol will be higher than that of the data symbol.

[0237] One way to determine which values of q will produce DMRS sequences with low PAPR is to first calculate wherein d is an integer that minimizes the absolute value of y, and if the absolute value of y is between a threshold 1 and a threshold 2 (threshold 2 is greater than threshold 1), the q value is considered to generate a DMRS sequence with low PAPR. The q values that generate a DMRS sequence with low PAPR form a set.

[0238] Thus, the terminal and / or the RAN node can determine whether to apply the first capability based on the q value. For example, when the value of the Zadoff-Chu sequence root of the reference signal sequence in the second information belongs to the set, the terminal supports the first capability. Alternatively, the first condition indicated by the second information includes the set of q values for which the terminal supports the first capability. After the RAN node receives the second information and determines the set of q values for which the terminal indicated by the second information supports the first capability, if the q value used by the subsequently scheduled PUSCH belongs to the set of q values reported by the terminal, the RAN node sends the first information to the terminal in addition to the PUSCH scheduling information (including time-frequency resources, etc.) to indicate the use of the first capability; if the q value used by the subsequently scheduled PUSCH does not belong to the set of q values reported by the terminal, the RAN node sends the first information to the terminal in addition to the PUSCH scheduling information (including time-frequency resources, etc.) to indicate the non-use of the first capability.

[0239] As introduced above, the one or more parameters include the overhead of the reference signal sequence. It can be understood that the first capability is related to the overhead (OH) of the reference signal sequence. The overhead of the reference signal sequence can also be referred to as the density of the reference signal sequence.

[0240] The lower the DMRS density, the more difficult it is to ensure that the PAPR of the DMRS symbol is not higher than the PAPR of the data symbol. For example, the DMRS sequence is generated based on the ZC sequence, and q = 1, the first data uses QPSK DFT-s-OFDM waveform, and the transmission bandwidth is 270 RBs. Figure 5 shows the PAPR of the DMRS symbol when the DMRS overhead is 1 / 2, 1 / 3, 1 / 4, and 1 / 6. It can be seen that as the OH decreases, the PAPR of the DMRS symbol becomes worse.

[0241] Based on this, optionally, the first condition indicated by the second information can include a threshold of overhead of a reference signal sequence (such as DMRS). After the RAN node receives the second information and determines the threshold of overhead of DMRS indicated by the second information, if the overhead of DMRS in the subsequently scheduled PUSCH is greater than or equal to the DMRS overhead value threshold, the RAN node sends the first information to the terminal in addition to issuing the PUSCH scheduling information (including time-frequency resources, etc.) to the terminal, and the first information indicates the use of the first capability. If the overhead of DMRS in the subsequently scheduled PUSCH is less than or equal to the DMRS overhead value threshold, the RAN node sends the first information to the terminal in addition to issuing the PUSCH scheduling information (including time-frequency resources, etc.) to the terminal, and the first information indicates not to use the first capability.

[0242] It should be understood that the reported DMRS overhead value threshold can also be related to the modulation order corresponding to the first data. For example, the lower the modulation order corresponding to the first data, the lower the DMRS overhead value threshold. For example, if the modulation order corresponding to the first data is 1, the DMRS overhead value threshold can be 1 / 3. If the modulation order corresponding to the first data is 2, the overhead value threshold can be 1 / 2.

[0243] As introduced in the foregoing, optionally, the one or more parameters include the number of reference symbols or the time domain resource overhead of reference symbols, which can be understood as being related to the first capability and the number of reference symbols or the time domain resource overhead of reference symbols.

[0244] Assuming that the PUSCH contains a DMRS symbols and b data symbols, the DMRS symbol overhead is Assuming that the code rate is c when Type 1 is considered and the first capability is not used, the lowest code rate when the first capability is used is “Lowest” is because the modulation order corresponding to the first data can be less than or equal to the modulation order corresponding to the second data.

[0245] Analysis It can be seen that it decreases with the increase of a, that is, the larger a is, the higher the code rate reduction ratio achieved by using the first capability is. Therefore, the demodulation signal-to-noise ratio gain obtained by using the first capability is greater.

[0246] Thus, the first capability is used when the number of DMRS symbols or the overhead of DMRS symbols exceeds a threshold. Optionally, the first condition indicated by the second information comprises a threshold of the overhead of reference symbols (e.g., DMRS symbols). After the RAN node receives the second information and determines the threshold of the overhead of DMRS symbols indicated by the second information, if the overhead of DMRS symbols in the subsequently scheduled PUSCH is greater than or equal to the reported threshold of the overhead of DMRS symbols, the RAN node sends the first information to the terminal in addition to the PUSCH scheduling information (including time-frequency resources, etc.) to the terminal, and the first information indicates that the first capability is used. If the overhead of DMRS symbols in the subsequently scheduled PUSCH is less than or equal to the reported threshold of the overhead of DMRS symbols, the RAN node sends the first information to the terminal in addition to the PUSCH scheduling information (including time-frequency resources, etc.) to the terminal, and the first information indicates that the first capability is not used.

[0247] As introduced above, the one or more parameters comprise a channel quality. It can be understood that the first capability is related to the channel quality. The channel quality can be quantified by, for example, a signal-to-interference-and-noise ratio (SINR) at the receiving end. For example, the channel quality can be quantified by a reference signal received power (RSRP) at the receiving end. For another example, the channel quality can be quantified by a reference signal received quality (RSRQ) at the receiving end. For example, a small SINR indicates a poor channel quality, and a large SINR indicates a good channel quality. If the channel has a large multipath delay spread, the channel is highly frequency-selective, and the SINR is small, in order to ensure the channel estimation quality, the DMRS sequence cannot be FDMed with the first data, but power boosting is performed on the DMRS sequence, and the power boosting degree is given in Table 2. Correspondingly, the first capability is used when the channel quality satisfies a channel quality condition. For example, the channel quality condition can be a threshold of the channel quality (e.g., the SINR). If the channel quality of the subsequently scheduled PUSCH satisfies the threshold of the channel quality, the RAN node sends the first information to the terminal in addition to the PUSCH scheduling information (including time-frequency resources, etc.) to the terminal, and the first information indicates that the first capability is used. If the channel quality of the subsequently scheduled PUSCH does not satisfy the threshold of the channel quality, the RAN node sends the first information to the terminal in addition to the PUSCH scheduling information (including time-frequency resources, etc.) to the terminal, and the first information indicates that the first capability is not used.

[0248] As introduced above, the third information indicates the capability of the terminal. Optionally, the capability of the terminal comprises whether the terminal supports a first processing manner, wherein the first processing manner is used to reduce the PAPR of the reference symbols. The third information indicates the first processing manner, which can be understood as that the first capability is related to the first processing manner or the capability of the terminal to reduce the PAPR. The first processing manner is introduced below.

[0249] To reduce the PAPR, FDM can be combined with time division multiplexing (TDM), which is referred to as FDM+TDM scheme hereinafter. Correspondingly, the first processing manner can include the FDM+TDM scheme. One FDM+TDM implementation is shown in FIG. 6. Sequence 1 {a k} can be understood as a time-domain DMRS sequence, and sequence 2 {b k} can be understood as a time-domain data sequence. Alternatively, sequence 1 can be understood as a time-domain data sequence, and sequence 2 can be understood as a time-domain DMRS sequence. As can be seen from FIG. 6, sequence 1 and sequence 2 appear at different time, i.e., so-called TDM.

[0250] It is pointed out here that in some scenarios where the first data is carried in some DMRS symbols, introducing TDM can be a necessary option to make the PAPR of the DMRS symbol not higher than the PAPR of the data symbol. For example, the data symbol adopts a pi / 2-BPSK DFT-s-OFDM waveform, and in the case of FDM of the DMRS sequence and the single-carrier data, in order to make the PAPR of the DMRS symbol not higher than the PAPR of the data symbol, the following condition needs to be met: TDM is used, the time-domain DMRS sequence is a pi / 2-BPSK sequence, and the time-domain data sequence is also a pi / 2-BPSK sequence.

[0251] Using TDM will shorten the length of the time-domain DMRS sequence on the basis of FDM. For example, the transmission bandwidth is x RBs, and DMRS type 1 is considered, and the length of the frequency-domain DMRS sequence corresponds to x / 2 RBs. Using TDM can make the length of the time-domain DMRS sequence correspond to x / 4 RBs (corresponding to the scheme in FIG. 6), or even lower.

[0252] The disadvantages brought by shortening the length of the time-domain DMRS sequence are introduced below. For example, shortening the length of the time-domain DMRS sequence can deteriorate the correlation (such as cross-correlation) of the sequence, and further cause the anti-interference (such as the same-frequency interference between different cells) capability to decrease. For example, if the time-domain DMRS sequence is a pi / 2-BPSK sequence, shortening the length of the time-domain DMRS sequence will cause the flatness of the frequency-domain DMRS sequence to deteriorate, and the channel estimation performance to deteriorate.

[0253] In addition to shortening the length of the time-domain DMRS sequence, using TDM will also shorten the number of effective symbols carried by the DMRS symbol. For example, still considering DMRS type 1, the number of effective symbols carried corresponds to x / 4 RBs. If x is small, the amount of data carried is also small, and the capacity is not significantly improved, so the first capability will not be used.

[0254] Based on the above two aspects, in the FDM+TDM scheme, the transmission bandwidth cannot be too small. Therefore, as introduced above, one or more parameters including the bandwidth of the transmitted service data can be understood as being related to the transmission bandwidth. For example, when the transmission bandwidth is greater than a threshold (e.g., denoted as TransBWThld), the terminal can support the first capability. Optionally, the first condition indicated by the second information includes the TransBWThld. After the RAN node receives the second information and determines the TransBWThld indicated by the second information, if the transmission bandwidth corresponding to the subsequently scheduled PUSCH is greater than or equal to the TransBWThld, the RAN node sends the first information to the terminal in addition to the PUSCH scheduling information (including time-frequency resources, etc.) to the terminal, and the first information indicates the use of the first capability. If the transmission bandwidth corresponding to the subsequently scheduled PUSCH is less than the TransBWThld, the RAN node sends the first information to the terminal in addition to the PUSCH scheduling information (including time-frequency resources, etc.) to the terminal, and the first information indicates the non-use of the first capability.

[0255] To reduce the PAPR, the terminal can reduce the modulation order corresponding to the first data to be lower than the modulation order of the second data in the data symbol, as shown in FIG. 7. Correspondingly, the first processing mode can include a scheme of reducing the modulation order corresponding to the first data. For example, referring to FIG. 7, data 1 (i.e., the first data) adopts pi / 2-BPSK modulation, and data 2 (i.e., the second data) adopts QPSK modulation; or data 1 adopts QPSK modulation, and data 2 adopts 16QAM. Note that pi / 2-BPSK modulation is not supported by all terminals. Therefore, the terminal can report whether it supports pi / 2-BPSK modulation, or in other words, the capability of the terminal indicated by the third information can include whether the terminal supports pi / 2-BPSK. If the terminal supports pi / 2-BPSK, data 2 can use the scheme of reducing the modulation order corresponding to the first data to reduce the PAPR of the DMRS symbol when adopting QPSK modulation. If the terminal does not support pi / 2-BPSK, data 2 cannot use the scheme of reducing the modulation order corresponding to the first data to reduce the PAPR of the DMRS symbol when adopting QPSK modulation.

[0256] Because the modulation order of data 1 is lower than that of data 2, the demodulation signal-to-noise ratio threshold of data 1 is lower than that of data 2. Thus, the transmission power of data 1 can be reduced, i.e., the energy per RE (EPRE) of data 1 is reduced, under the condition that data 1 does not become a bottleneck of demodulation performance. In the case that the total energy of DMRS symbols (the sum of energy on all REs) is unchanged, the EPRE of the first data is reduced while the EPRE of the DMRS sequence is increased, i.e., the DMRS sequence is power boosted.

[0257] The above describes that the first data in the DMRS and the second data in the data symbol can use different modulation orders. Further, the data can also use different code rates, i.e., the bits carried by the first data and the bits carried by the second data come from different codewords.

[0258] In summary, based on the PAPR reduction scheme shown in FIG. 7, the terminal needs to have the capability of simultaneously performing two modulation schemes. When two codewords are used, the capability of simultaneously processing two codewords is also required.

[0259] To reduce the PAPR, the terminal can also perform other schemes, and the terminal and the RAN node can predefine the PAPR reduction scheme, such as forming a table (as shown in Table 5), and then reporting the supported method in the form of an index value. Table 5 schematically shows the PAPR reduction method predefined based on the index value.

[0260] Table 5

[0261] Ten low-PAPR methods are listed in Table 5, and the index value can be represented by a 4-bit field. For example, index value 0 corresponds to 0000, and index value 9 is represented by 1001. The first processing mode can include at least one method in Table 5.

[0262] In some examples, when the second target condition is met, the first information indicates that the reference symbol does not carry the first data. The second target condition can include at least one of the following: the RAN node does not receive the second information sent by the terminal; the RAN node receives the second information sent by the terminal, and all or part of the one or more parameters do not meet the first condition indicated by the second information; the RAN node does not receive the third information sent by the terminal; the RAN node receives the third information sent by the terminal, and the terminal does not process the service data in the manner indicated by the third information; the RAN node does not receive the fourth information sent by the terminal; the RAN node receives the fourth information sent by the terminal, and the fourth information indicates that the first capability is not supported; or, the channel quality does not meet the channel quality condition.

[0263] In some examples, the first information indicates that the reference symbol carries the first data when a third target condition is satisfied. The third target condition can comprise at least one of: the terminal supporting the first capability, or, the channel quality satisfying a channel quality condition.

[0264] In some examples, the first information indicates that the reference symbol does not carry the first data when a fourth target condition is satisfied. The fourth target condition can comprise at least one of: the terminal not supporting the first capability, or, the channel quality not satisfying the channel quality condition.

[0265] The present application does not limit the manner in which the RAN node determines that the terminal supports the first capability. In some examples, the RAN node determines that the terminal supports the first capability when a fifth target condition is satisfied. The fifth target condition can comprise at least one of: the RAN node receiving second information sent by the terminal, and one or more parameters satisfying first conditions indicated by the second information; the RAN node receiving third information sent by the terminal, and the terminal processing service data in a manner indicated by the third information; the RAN node receiving fourth information sent by the terminal, and the fourth information indicating that the first capability is supported.

[0266] The present application does not limit the manner in which the RAN node determines that the terminal does not support the first capability. In some examples, the RAN node determines that the terminal does not support the first capability when a sixth target condition is satisfied. The sixth target condition can comprise at least one of: the RAN node not receiving second information sent by the terminal; the RAN node receiving second information sent by the terminal, and all or a part of one or more parameters not satisfying first conditions indicated by the second information; the RAN node not receiving third information sent by the terminal; the RAN node receiving third information sent by the terminal, and the terminal not processing service data in a manner indicated by the third information; the RAN node not receiving fourth information sent by the terminal; the RAN node receiving fourth information sent by the terminal, and the fourth information indicating that the first capability is not supported.

[0267] It should be understood that, for the PDSCH, in future communication systems, it can also support a low-PAPR DFT-s-OFDM waveform, and support FDM of a DMRS sequence and single-carrier data. Thus, in the scheme provided by the present application, the PUSCH can also be replaced by the PDSCH.

[0268] The foregoing introduces the communication apparatus provided by the third aspect of the present application. The communication apparatus can comprise a transceiver unit, and optionally, the communication apparatus can further comprise a processing unit.

[0269] Optionally, the communication apparatus can be configured to perform the steps or procedures performed by the terminal in the example shown in FIG. 3, the transceiver can be configured to perform the steps of sending and / or receiving performed by the terminal, and the processor can be configured to perform the internal operations or actions performed by the terminal. For example, the transceiver can be configured to perform S301 and S302, and the processor can be configured to perform S303. Details can be referred to the related description in the foregoing method example.

[0270] Optionally, the communication apparatus can be configured to perform the steps or procedures performed by the RAN node in the example shown in FIG. 3, the transceiver can be configured to perform the steps of sending and / or receiving performed by the RAN node, and the processor can be configured to perform the internal operations or actions performed by the RAN node. For example, the transceiver can be configured to perform S302 and S301. Details can be referred to the related description in the foregoing method example.

[0271] In the present application, the internal operations or actions can be operations other than the sending operations and the receiving operations in the flowchart of the communication method, for example, the steps described in the rectangular boxes in the flowchart.

[0272] The foregoing also introduces the communication apparatus provided in the fourth aspect of the present application. The communication apparatus includes at least one processor, and the at least one processor is configured to execute a computer program stored in a memory, so that the processor implements the steps performed by the terminal or the RAN node in the example shown in FIG. 3.

[0273] The foregoing also introduces the chip (or chip apparatus or chip system) provided in the fifth aspect of the present application. The chip includes a processor, which is configured to invoke a computer program or computer instructions in a memory, so that the processor performs the steps or procedures performed by the terminal or the RAN node in the example shown in FIG. 3. Optionally, the processor is coupled to the memory through an interface.

[0274] In the present application, the processor mentioned in any place can be a general central processor, a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the method provided in any of the foregoing embodiments. The memory mentioned in any of the foregoing places can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM), etc.

[0275] The foregoing also introduces a computer-readable storage medium provided by the sixth aspect of the present application, which includes computer instructions that, when executed on a computer, cause the computer to perform the steps or processes performed by the terminal or the RAN node in the example shown in FIG. 3.

[0276] The foregoing also introduces a computer program product provided by the seventh aspect of the present application, which includes computer instructions that, when executed on a computer, cause the computer to perform the steps or processes performed by the terminal or the RAN node in the example shown in FIG. 3.

[0277] The foregoing also introduces a communication system provided by the eighth aspect of the present application, which includes all or part of the devices in the example shown in FIG. 3. For example, the communication system is shown in FIG. 2.

[0278] In the present application, the processing unit can be implemented by at least one processor or processor-related circuit. Specifically, the processor can include a modem chip, or a SoC chip or a SIP chip containing a modem core. The transceiving unit can be implemented by a transceiver or transceiver-related circuit. The transceiving unit can also be referred to as a communication module or a communication interface. The storage module can be implemented by at least one memory.

[0279] Optionally, in the present application, when the communication apparatus is a circuit or chip responsible for communication functions, such as a modem chip or a SoC chip or a SIP chip containing a modem core, the functions of the processing unit can be implemented by the circuit system including one or more processors or processing cores in the above-mentioned chip. The functions of the transceiving unit can be implemented by the interface circuit or data transceiving circuit on the above-mentioned chip.

[0280] In the present application, when the communication apparatus is a terminal, FIG. 8 shows a simplified structural schematic diagram of a terminal. As shown in FIG. 8, the terminal includes a processor, a memory, and a transceiver. The memory can store computer program codes, and the transceiver includes a transmitter 831, a receiver 832, a radio frequency circuit (not shown in the figure), an antenna 833, and an input and output device (not shown in the figure).

[0281] The processor is mainly used for processing communication protocols and communication data, controlling the terminal, executing software programs and processing data of software programs, etc. The memory is mainly used for storing software programs and data. The radio frequency circuit is mainly used for conversion between baseband signals and radio frequency signals and processing of radio frequency signals. The antenna is mainly used for transceiving radio frequency signals in the form of electromagnetic waves. The input and output device can include a touch screen, a display screen, or a keyboard, etc. The input and output device is mainly used for receiving data input by a user and outputting data to the user. It should be noted that some types of terminals can not have an input and output device.

[0282] When data needs to be sent, the processor performs baseband processing on the data to be sent, and outputs a baseband signal to the radio frequency circuit. Then, the radio frequency circuit performs radio frequency processing on the baseband signal, and sends a radio frequency signal in the form of an electromagnetic wave through an antenna. When data is sent to the terminal, the radio frequency circuit receives a radio frequency signal through the antenna. The radio frequency circuit converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. For ease of illustration, only one memory, one processor, and one transceiver are shown in FIG. 8. In an actual terminal product, there can be one or more processors and one or more memories. The memory can also be referred to as a storage medium or a storage device, etc. The memory can be arranged independently of the processor, or can be integrated with the processor, and the embodiments of the present application do not limit this.

[0283] In the embodiments of the present application, the antenna and the radio frequency circuit with transceiving functions can be regarded as a transceiving unit of the terminal, and the processor with processing functions can be regarded as a processing unit of the terminal.

[0284] As shown in FIG. 8, the terminal includes a processor 810, a memory 820, and a transceiver 830. The processor 810 can also be referred to as a processing unit, a processing board, a processing unit, or a processing device, etc. The transceiver 830 can also be referred to as a transceiving unit, a transceiver, or a transceiving device, etc.

[0285] Optionally, the devices in the transceiver 830 for implementing the receiving function and / or the sending function are regarded as a transceiving unit. The transceiver can also be referred to as a transceiver, a transceiving module, or a transceiving circuit, etc. at times.

[0286] The processor 810 is configured to perform the processing actions of the terminal side in the example shown in FIG. 3. The transceiver 830 is configured to perform the transceiving actions of the terminal in the example shown in FIG. 3. It should be understood that FIG. 8 is only an example and the terminal including the transceiving unit and the processing unit described above can not depend on the structure shown in FIG. 8.

[0287] When the communication apparatus 800 is a chip, the chip includes a processor, a memory, and a transceiver. The transceiver can be an input / output circuit or a communication interface. The processor can be a processing unit integrated on the chip or a microprocessor or an integrated circuit. The sending operation of the terminal in the method embodiments can be understood as the output of the chip, and the receiving operation of the terminal in the method embodiments can be understood as the input of the chip.

[0288] In the present application, when the communication apparatus is a RAN node, for example, a gNB or a base station, FIG. 9 shows a simplified base station structure diagram. The base station includes a 910 part, a 920 part, and a 930 part.

[0289] The 910 part is mainly used for baseband processing and controlling the base station, etc. The 910 part is usually the control center of the base station and can be referred to as a processor, which is used to control the base station to perform the processing operations of the access network device side in the above method embodiments.

[0290] The 920 part is mainly used for storing computer program codes and data.

[0291] The 930 part is mainly used for transceiving radio frequency signals and converting radio frequency signals and baseband signals. The 930 part can be referred to as a transceiving unit, a transceiving module, a transceiver, a transceiving circuit, or a transceiver, etc. The transceiving module of the 930 part can also be referred to as a transceiver, etc., which includes an antenna 933 and a radio frequency circuit (not shown in the figure), wherein the radio frequency circuit is mainly used for radio frequency processing. Optionally, the devices in the 930 part used to realize the receiving function can be regarded as a receiver, and the devices used to realize the sending function can be regarded as a transmitter, that is, the 930 part includes a receiver 932 and a transmitter 931. The receiver can also be referred to as a receiving unit, a receiver, or a receiving circuit, etc., and the transmitter can be referred to as a sending module, a transmitter, or a sending circuit, etc.

[0292] The 910 part and the 920 part can include one or more single boards, and each single board can include one or more processors and one or more memories. The processor is used to read and execute the program in the memory to realize the baseband processing function and the control of the base station. If there are multiple single boards, the single boards can be interconnected to enhance the processing capability. As an optional implementation, multiple single boards can also share one or more processors, or multiple single boards can share one or more memories, or multiple single boards can share one or more processors at the same time.

[0293] For example, in an implementation, the transceiving module of the 930 part is used to perform the transceiving-related processes performed by the RAN node side in the example shown in FIG. 3. The processor of the 910 part is used to perform the processing-related processes performed by the RAN node side in the example shown in FIG. 3.

[0294] It should be understood that FIG. 9 is only an example and not a limitation, and the network device including the processor, the memory, and the transceiver described above can not depend on the structure shown in FIG. 9.

[0295] When the communication device 900 is a chip, the chip includes a transceiver, a memory, and a processor. The transceiver can be an input-output circuit, a communication interface; the processor is an integrated processor on the chip, or a microprocessor, or an integrated circuit. The sending operation of the RAN node in the above method embodiments can be understood as the output of the chip, and the receiving operation of the RAN node in the above method embodiments can be understood as the input of the chip.

[0296] Those skilled in the art can clearly understand that the explanation and beneficial effects of the related content in any of the above-provided devices can refer to the corresponding method embodiments provided above for the convenience and brevity of description, and will not be repeated here.

[0297] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0298] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0299] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0300] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially make contributions or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various program code storage media.

[0301] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A communication method applied to a first device, characterized in that, The method comprises: receiving first information sent by a second device, the first information indicating that a reference symbol carries first data, or the first information indicating that the reference symbol does not carry the first data, wherein the first data adopts single-carrier modulation.

2. The method of claim 1, wherein, The reference symbol carrying the first data comprises that the reference symbol carries a reference signal sequence, and the reference signal sequence does not overlap with frequency domain resources occupied by the first data.

3. The method according to claim 1 or 2, characterized in that, Before receiving the first information sent by the second device, the method further comprises: sending second information to the second device, the second information indicating a first condition, the first condition being a condition that one or more parameters are satisfied, the one or more parameters being parameters related to processing service data by the first device, the service data comprising the first data, the first condition being related to a first capability, the first capability comprising that the reference symbol carries the first data.

4. The method of claim 3, wherein, The one or more parameters comprise at least one of the following: a modulation order of second data, a modulation and coding scheme (MCS) of the second data, a Zadoff-Chu (ZC) sequence root of the reference signal sequence, an overhead of the reference signal sequence, a number of the reference symbols, a time domain resource overhead of the reference symbols, or a bandwidth for transmitting the service data, wherein the service data comprises the second data, the second data adopts single-carrier modulation, and the second data occupies different time domain resources from the reference symbol.

5. The method according to any one of claims 1-4, characterized in that, Before receiving the first information sent by the second device, the method further comprises: sending third information to the second device, the third information indicating whether to support pi / 2-binary phase shift keying (BPSK) and / or indicating a first processing manner, wherein the first processing manner is used to reduce a peak-to-average power ratio (PAPR) of the reference symbol.

6. The method according to any one of claims 1-5, characterized in that, Before receiving the first information sent by the second device, the method further comprises: sending fourth information to the second device, the fourth information indicating that a first capability is supported or not supported, the first capability comprising that the reference symbol carries the first data.

7. The method according to any one of claims 1 to 6, characterized in that, The reference symbol comprises a demodulation reference signal (DMRS), a sounding reference signal (SRS), a tracking reference signal (TRS), or a channel state information reference signal (CSI-RS).

8. The method according to any one of claims 1-7, characterized in that, The first information is carried by at least one of the following: downlink control information (DCI), a radio resource control (RRC) message, or a medium access control (MAC) control element (CE). 9.A communication method applied to a second device, the method comprising: The method comprises: sending first information to a first device, the first information indicating that a reference symbol carries first data, or the first information indicating that the reference symbol does not carry the first data, wherein the first data adopts single-carrier modulation.

10. The method of claim 9, wherein, The reference symbol carrying the first data comprises that the reference symbol carries a reference signal sequence, and the reference signal sequence does not overlap with frequency domain resources occupied by the first data.

11. The method according to claim 9 or 10, characterized in that, Before sending the first information to the first device, the method further comprises: receiving second information sent by the first device, the second information indicating a first condition, the first condition being a condition that one or more parameters are satisfied, the one or more parameters being parameters related to processing of service data by the first device, the service data including the first data, the first condition being related to a first capability, the first capability including that the reference symbol carries the first data.

12. The method of claim 11, wherein, The one or more parameters include at least one of: a modulation order of second data, a modulation and coding scheme (MCS) of the second data, a Zadoff-Chu (ZC) sequence root of the reference signal sequence, an overhead of the reference signal sequence, a number of the reference symbols, a time domain resource overhead of the reference symbols, or a bandwidth for transmitting the data, wherein the service data includes the second data, the second data is modulated by using a single carrier, and the second data and the reference symbol occupy different time domain resources.

13. The method according to any one of claims 9-12, characterized in that, Before sending the first information to the first device, the method further includes: receiving third information sent by the first device, the third information indicating whether pi / 2-binary phase shift keying (BPSK) is supported and / or indicating a first processing manner, wherein the first processing manner is used to reduce a peak-to-average power ratio (PAPR) of the reference symbol.

14. The method according to any one of claims 9-13, characterized in that, Before sending the first information to the first device, the method further includes: receiving fourth information sent by the first device, the fourth information indicating whether a first capability is supported or not, the first capability including that the reference symbol carries the first data.

15. The method according to any one of claims 9-14, characterized in that, The first information is determined based on at least one of: channel quality, the second information, the third information, or the fourth information.

16. A communications device, characterized by A module for performing the method of any one of claims 1-8 or 9-15.

17. A communications device, characterized by At least one processor configured to execute computer programs or instructions to implement the method of any one of claims 1-8 or 9-15.

18. The communication apparatus according to claim 17, wherein Further comprising a memory storing the computer programs or instructions.

19. A chip, characterized by A processor configured to invoke the computer programs or instructions in the memory to cause the processor to perform the method of any one of claims 1-8 or 9-15.

20. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer programs or instructions, which, when executed by a communication device, implement the method of any one of claims 1-8 or 9-15.

21. A computer program product, characterised in that, A computer program or instructions, which, when executed by a computer, implement the method of any one of claims 1-8 or 9-15.

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