Communication method and device

Abstract

The invention provides a communication method and device, and relates to the technical field of communication. In the communication method, a network device may directly indicate an index of a power scaling factor to a terminal device, a first index associated with the first power scaling factor, the first power scaling factor being a ratio of a transmission power of first data to a transmission power of a first DMRS, the terminal device may directly determine the power scaling factor based on the index, and the power scaling factor being a ratio of the transmission power of the first data to the transmission power of the first DMRS. According to the invention, a novel mode for determining the power scaling factor is provided, so that the power scaling factor is accurately indicated, and the communication efficiency between the network device and the terminal device is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication method and device. Background Art

[0002] The power scaling factor of the demodulation reference signal (DMRS) can be used for channel estimation when demodulating physical channels such as the physical downlink shared channel (PDSCH). Both DMRS and data can be mapped on the physical channel. The power scaling factor of DMRS represents the ratio of the power of data sent by the network side to the power of DMRS sent. The power scaling factor of DMRS is generally determined based on downlink control information (DCI).

[0003] With the continuous evolution of standards, more communication scenarios have gradually emerged, and how to determine the power scaling factor of DMRS needs further study. Summary of the invention

[0004] An embodiment of the present application provides a communication method and apparatus for providing a way to indicate a power scaling factor of a DMRS, which can more accurately indicate the power scaling factor in different communication scenarios.

[0005] In the first aspect, an embodiment of the present application provides a communication method, which can be executed by a first terminal device. The first terminal device can be a terminal device, or a software module or a hardware module (such as a chip) in a terminal device, or it can also be a device with the same function as the terminal device. The first terminal device is, for example, a mobile phone, a vehicle-mounted device, or an Internet of Things device. The embodiment of the present application does not limit the specific implementation method of the first terminal device. The method includes: receiving first information from a first network device, the first information is used to indicate a first index of a first power scaling factor, and the first index is associated (or corresponds) to the first power scaling factor. In this way, after the first terminal device receives the first information, it can obtain the first power scaling factor.

[0006] It should be understood that the first index is the index of the first power scaling factor, and the first index is also called the number, serial number or identifier of the first power scaling factor, etc., and there is no limitation on this. The power scaling factor may also be referred to as the scaling factor for short. The first power scaling factor is the ratio between the transmit power of the first data (which may be referred to as the first power) and the transmit power of the first DMRS (which may be referred to as the second power). The first power is, for example, the power of the first network device to send the first data to the first terminal device, and the second power is, for example, the power of the first network device to send the first DMRS to the first terminal device. The first data and the first DMRS are associated (or correspond), for example, the first data and the first DMRS are both mapped on physical channels such as PDSCH. The first information is, for example, proprietary signaling or DCI, etc., and there is no limitation on this in the embodiments of the present application.

[0007] In the embodiment of the present application, the power scaling factor can be directly associated with the index, and the first network device can directly indicate the first index of the first power scaling factor to the first terminal device, so that the first terminal device can directly obtain the first power scaling factor according to the first index, and provide a mechanism for determining the power scaling factor. Since the first index directly indicates the first power scaling factor, the power scaling factor can be indicated more accurately, which is conducive to the application of the embodiment of the present application in more communication scenarios. Moreover, in the embodiment of the present application, the first terminal device does not need to perform a lot of processing and calculation, which is conducive to simplifying the process of the first terminal device determining the first power scaling factor.

[0008] In one possible embodiment, the method further includes: determining the first power scaling factor associated with the first index from second information, wherein the second information includes multiple indexes and multiple power scaling factors, each of the multiple indexes is associated with a power scaling factor among the multiple power scaling factors, and the multiple indexes include the first index.

[0009] It should be understood that the second information may be preconfigured or predefined in the first terminal device, for example, it may be preconfigured or predefined in the first terminal device through a protocol, or the second information may be received from the first network device, or the second information may be determined by negotiation between the first network device and the first terminal device, and the embodiment of the present application does not specifically limit this. The second information may be in a variety of forms, such as a table form.

[0010] In the above implementation, the first terminal device can search the power scaling factor associated with the first index from the second information based on the first index. That is, the first terminal device can obtain the first power scaling factor through one search, and the method for obtaining the first power scaling factor is relatively simple.

[0011] In one possible implementation, the multiple power scaling factors include -4.39dB, -4.26dB, -4.19dB, -3.98dB, -3.83dB, -3.68dB, -3.52dB, -3.36dB, -3.27dB, -3.19dB, -2.83dB, -2.73dB, -2.63dB, -2.43dB, -2.22dB, -2.00dB, -1.96dB, - At least one of 1.76dB, -1.51dB, -1.38dB, -1.25dB, -0.97dB, -0.79dB, -0.67dB, -0.51dB, -0.35dB, -0.30dB, 0.38dB, 0.58dB, 0.79dB, 1.24dB, 1.25dB, 1.76dB, 2.34dB, 3.01dB, 4.26dB, 4.77dB, and 6.02dB. Optionally, the multiple power scaling factors also include 0dB, -3dB, and -4.77dB. It should be understood that the multiple power scaling factors can be regarded as part or all of the power scaling factors in the set of possible values ​​of the first power scaling factor.

[0012] In the above implementation, more values ​​of multiple power scaling factors are available, including power scaling factors for more communication scenarios, which makes the implementation applicable to more communication scenarios. On the one hand, it can solve the problem that the use of existing power scaling factors in new communication scenarios may lead to normal communication failure. On the other hand, when demodulating data, more reliable demodulation can be performed based on more accurate power scaling factors.

[0013] In a possible implementation, the method further includes: receiving third information from the first network device, the third information being used to indicate a configuration type of the first DMRS, and the first power scaling factor being also associated with the configuration type of the first DMRS. It should be understood that the first DMRS configuration type is, for example, DMRS type1 or DMRStype2, etc. Optionally, the second information also includes a configuration type of the DMRS associated with each power scaling factor in the plurality of power scaling factors.

[0014] In the above implementation, the first terminal device may determine the configuration type of the first DMRS based on the instruction of the first network device, so that the first terminal device can determine the first power scaling factor based on the first index and the configuration type of the first DMRS.

[0015] In a possible implementation, when the configuration type of the first DMRS is the first configuration type, the first index is carried in K bits of the first information; when the configuration type of the first DMRS is the second configuration type, the first index is carried in L bits of the first information; wherein the first configuration type is different from the second configuration type, L and K are both positive integers, and the value of L is greater than the value of K. Optionally, the number of ports supported by the first configuration type is less than the number of ports supported by the second configuration type. wherein the first configuration type is, for example, DMRS type1, and the second configuration type is, for example, DMRS type2.

[0016] In the above implementation, if the configuration type of the first DMRS is different, the first index can be carried by different numbers of bits in the first information, thereby realizing a mechanism of using a dynamic number of bits to carry the first index, improving the flexibility of carrying the first index, and being able to minimize the number of bits occupied by the first index in the first information.

[0017] In one possible implementation, the multiple power scaling factors are divided into a first category of power scaling factors and a second category of power scaling factors, wherein the first category of power scaling factors includes the multiple power scaling factors, and the second category of power scaling factors includes 0dB, -3.01dB and -4.77dB; when the first power scaling factor belongs to the first category of power scaling factors, the first index is carried in the first field of the first information; or, when the first power scaling factor belongs to the second category of power scaling factors, the first index is carried in the second field of the first information; wherein the first field is different from the second field.

[0018] In the above implementation, different fields in the first information may be used to indicate the indexes of different types of power scaling factors, thereby increasing the flexibility of indicating the first index. Moreover, this approach can relatively reduce the modification of the first field of the first information.

[0019] In a possible implementation, the first type of power scaling factor includes: a power scaling factor in a first case, wherein the first DMRS and the DMRS of the second terminal device occupy the same time domain resources, and the first data and the data of the second terminal device occupy (completely) different time domain resources; and / or, a power scaling factor in a second case, wherein the first DMRS and the DMRS of at least two second terminal devices occupy the same time domain resources, and the first data and the data of a part of the at least two second terminal devices occupy exactly the same time domain resources, and the first data and the data of another part of the at least two second terminal devices occupy completely different time domain resources. The first case can be regarded as a transmission DMRS in a single user (SU) time division multiplexing scenario that shares the same DMRS symbol.

[0020] In the above implementation, power scaling factors for more situations such as the first situation and the second situation are introduced, and the method provided in the above implementation can be applied to indicate the power scaling factors in these situations, that is, the above implementation has good applicability.

[0021] In one possible implementation, the second type of power scaling factor includes: a power scaling factor in a third case, wherein the first DMRS and the DMRS of the second terminal device occupy (completely) different time domain resources, and the first data and the data of the second terminal device occupy (completely) different time domain resources; and / or a power scaling factor in a fourth case, wherein the first DMRS and the DMRS of the second terminal device occupy the same time domain resources, and the first data and the data of the second terminal device occupy the same time domain resources.

[0022] It should be understood that the third case may be regarded as a transmission DMRS in a SU scenario, and the fourth case may be regarded as a transmission DMRS in a multi-user (MU) scenario.

[0023] In the above implementation, the third case and the fourth case are existing scenarios for transmitting DMRS, that is, the method provided in the above implementation can be applied to indicate the power scaling factors in these cases, and can be compatible with indicating the power scaling factors corresponding to the existing scenarios.

[0024] In a possible implementation, the method further includes: receiving fourth information from the first network device, the fourth information being used to indicate a first parameter, wherein the first power scaling factor is also associated with the first parameter, and the first parameter is the number of CDM groups of the first DMRS that does not carry the first data.

[0025] It should be understood that the CDM group of the first DMRS that does not carry the first data can be understood as a CDM group that does not carry data in the CDM group of the first DMRS.

[0026] In one possible implementation, the value of the first parameter is 2, and the CDM group of the first DMRS that does not carry the first data includes a first CDM group and a second CDM group; when the first DMRS only occupies the first CDM group and the second CDM group is not occupied, the first power scaling factor is half of the ratio of the number of first ports to the number of second ports; or, when the first DMRS only occupies the first CDM group and the second CDM group is occupied, the first power scaling factor is the ratio of the number of first ports to the number of second ports; or, when the first DMRS only occupies the first CDM gourp and the second CDM group, the first power scaling factor is the ratio of the first product to the first sum; wherein, the first port number is the number of occupied ports in the first CDM group, the second port number is the number of ports occupied by the first data, the first product is the product of the first port number and the third port number, the first sum is the sum of the first port number and the third port number, and the third port number is the number of occupied ports in the second CDM group.

[0027] In a possible implementation manner, the value of the first parameter is 3, and the CDM group of the first DMRS that does not carry the first data includes a first CDM group, a second CDM group, and a third CDM group; when the first DMRS only occupies the first CDM group, and the second CDM group and the third CDM group are not occupied, the first power scaling factor is one third of the ratio of the number of first ports to the number of second ports; or, when the first DMRS only occupies the first CDM group, and the second CDM group is occupied, and the third CDM group is not occupied, the first power scaling factor is two thirds of the ratio of the number of first ports to the number of second ports; or, when the first DMRS only occupies the first CDM group, and the second CDM group and the third CDM group are both occupied, the first power scaling factor is the ratio of the number of first ports to the number of second ports; or, when the first DMRS occupies the first CDM gourp and the second CDM group, and the third CDM group is not occupied, the first power scaling factor is two thirds of the ratio of the first product to the first sum; or, when the first DMRS only occupies the first CDM gourp and the second CDM group group, and the third CDM group is occupied, the first power scaling factor is the ratio of the first product to the first sum; or, when the first DMRS occupies the first CDM gourp, the second CDM group and the third CDM group, the first power scaling factor is the sum of the second product, the third product and the fourth product; wherein the first number of ports is the number of occupied ports in the first CDM group, the second number of ports is the number of ports occupied by the first data, the first product is the product of the first number of ports and the third number of ports, the first sum is the sum of the first number of ports and the third number of ports, the second product is the product of the first number of ports, the third number of ports and the fourth number of ports, the third product is the product of the first number of ports and the third number of ports, the fourth product is the product of the third number of ports and the fourth number of ports, the third number of ports is the number of occupied ports in the second CDM group, and the fourth number of ports is the number of occupied ports of the third CDM group.

[0028] In a second aspect, an embodiment of the present application provides a communication method, which can be executed by a first network device, such as a network device or a software or hardware module (such as a chip) in a network device. The first network device is specifically, for example, a chip, a central unit (CU) or a distributed unit (DU) in an access network device. The method includes: sending first information to a first terminal device, the first information is used to indicate a first index of a first power scaling factor, the first index is associated with the first power scaling factor, the first power scaling factor is a ratio of a first power to a second power, the first power is a transmission power of the first data, and the second power is a transmission power of a first demodulation reference signal DMRS.

[0029] In one possible implementation, the first power scaling factor is a power scaling factor associated with the first index in second information, wherein the second information includes multiple indexes and multiple power scaling factors, each of the multiple indexes is associated with a power scaling factor among the multiple power scaling factors, and the multiple indexes include the first index.

[0030] In one possible implementation, the multiple power scaling factors include -4.39dB, -4.26dB, -4.19dB, -3.98dB, -3.83dB, -3.68dB, -3.52dB, -3.36dB, -3.27dB, -3.19dB, -2.83dB, -2.73dB, -2.63dB, -2.43dB, -2.22dB, -2.00dB, -1.96dB, - At least one of 1.76dB, -1.51dB, -1.38dB, -1.25dB, -0.97dB, -0.79dB, -0.67dB, -0.51dB, -0.35dB, -0.30dB, 0.38dB, 0.58dB, 0.79dB, 1.24dB, 1.25dB, 1.76dB, 2.34dB, 3.01dB, 4.26dB, 4.77dB, and 6.02dB.

[0031] In a possible implementation manner, the multiple power scaling factors further include 0 dB, -3 dB and -4.77 dB.

[0032] In a possible implementation, the method further includes: sending third information to the first terminal device, where the third information is used to indicate a configuration type of the first DMRS, and the first power scaling factor is also associated with the configuration type of the first DMRS.

[0033] In one possible implementation, when the configuration type of the first DMRS is a first configuration type, the first index is carried in K bits of the first information; or, when the configuration type of the first DMRS is a second configuration type, the first index is carried in L bits of the first information; wherein the first configuration type is different from the second configuration type, and the value of L is greater than the value of K.

[0034] In one possible implementation, the multiple power scaling factors are divided into a first category of power scaling factors and a second category of power scaling factors, wherein the first category of power scaling factors includes the multiple power scaling factors, and the second category of power scaling factors includes 0dB, -3.01dB and -4.77dB; when the first power scaling factor belongs to the first category of power scaling factors, the first index is carried in the first field of the first information; or, when the first power scaling factor belongs to the second category of power scaling factors, the first index is carried in the second field of the first information; wherein the first field is different from the second field.

[0035] In one possible implementation, the first type of power scaling factors includes: a power scaling factor in a first case, wherein the first DMRS and the DMRS of the second terminal device occupy the same time domain resources, and the first data and the data of the second terminal device occupy (completely) different time domain resources; and / or a power scaling factor in a second case, wherein the first DMRS and the DMRS of at least two second terminal devices occupy the same time domain resources, and the first data and the data of a part of the at least two second terminal devices occupy exactly the same time domain resources, and the first data and the data of another part of the at least two second terminal devices occupy completely different time domain resources.

[0036] In one possible implementation, the second type of power scaling factor includes: a power scaling factor in a third case, wherein the first DMRS and the DMRS of the second terminal device occupy (completely) different time domain resources, and the first data and the data of the second terminal device occupy (completely) different time domain resources; and / or a power scaling factor in a fourth case, wherein the first DMRS and the DMRS of the second terminal device occupy the same time domain resources, and the first data and the data of the second terminal device occupy the same time domain resources.

[0037] In a possible implementation manner, the method further includes: sending the second information to the first terminal device.

[0038] In a possible implementation, the method further includes: sending fourth information to the first terminal device, the fourth information being used to indicate a first parameter, wherein the first power scaling factor is also associated with the first parameter, and the first parameter is the number of CDM groups of the first DMRS that does not carry the first data.

[0039] In a possible implementation, the value of the first parameter is 1, and the CDM group of the first DMRS that does not carry the first data includes the first CDM group; when the first DMRS only occupies the first CDM group, the first power scaling factor is the ratio of the number of first ports to the number of second ports, wherein the number of first ports is the number of occupied ports in the first CDM group, and the number of second ports is the number of ports occupied by the first data.

[0040] In one possible implementation, the value of the first parameter is 2, and the CDM group of the first DMRS that does not carry the first data includes a first CDM group and a second CDM group; when the first DMRS only occupies the first CDM group and the second CDM group is not occupied, the first power scaling factor is half of the ratio of the number of first ports to the number of second ports; or, when the first DMRS only occupies the first CDM group and the second CDM group is occupied, the first power scaling factor is the ratio of the number of first ports to the number of second ports; or, when the first DMRS only occupies the first CDM gourp and the second CDM group, the first power scaling factor is the ratio of the first product to the first sum; wherein, the first port number is the number of occupied ports in the first CDM group, the second port number is the number of ports occupied by the first data, the first product is the product of the first port number and the third port number, the first sum is the sum of the first port number and the third port number, and the third port number is the number of occupied ports in the second CDM group.

[0041] In a possible implementation manner, the value of the first parameter is 3, and the CDM group of the first DMRS that does not carry the first data includes a first CDM group, a second CDM group, and a third CDM group; when the first DMRS only occupies the first CDM group, and the second CDM group and the third CDM group are not occupied, the first power scaling factor is one third of the ratio of the number of first ports to the number of second ports; or, when the first DMRS only occupies the first CDM group, and the second CDM group is occupied, and the third CDM group is not occupied, the first power scaling factor is two thirds of the ratio of the number of first ports to the number of second ports; or, when the first DMRS only occupies the first CDM group, and the second CDM group and the third CDM group are both occupied, the first power scaling factor is the ratio of the number of first ports to the number of second ports; or, when the first DMRS occupies the first CDM gourp and the second CDM group, and the third CDM group is not occupied, the first power scaling factor is two thirds of the ratio of the first product to the first sum; or, when the first DMRS only occupies the first CDM gourp and the second CDM group group, and the third CDM group is occupied, the first power scaling factor is the ratio of the first product to the first sum; or, when the first DMRS occupies the first CDM gourp, the second CDM group and the third CDM group, the first power scaling factor is the sum of the second product, the third product and the fourth product; wherein the first number of ports is the number of occupied ports in the first CDM group, the second number of ports is the number of ports occupied by the first data, the first product is the product of the first number of ports and the third number of ports, the first sum is the sum of the first number of ports and the third number of ports, the second product is the product of the first number of ports, the third number of ports and the fourth number of ports, the third product is the product of the first number of ports and the third number of ports, the fourth product is the product of the third number of ports and the fourth number of ports, the third number of ports is the number of occupied ports in the second CDM group, and the fourth number of ports is the number of occupied ports of the third CDM group.

[0042] In a third aspect, an embodiment of the present application provides a communication method, which can be implemented by a first terminal device. The implementation method of the first terminal device can refer to the content of the first terminal device in the first aspect above, and the repeated parts are not listed again. The method includes: receiving fifth information from a first network device, the fifth information indicating a value of a first power scaling factor, the value of the first power scaling factor is -4.39dB, -4.26dB, -4.19dB, -3.98dB, -3.83dB, -3.68dB, -3.52dB, -3.36dB, -3.27dB, -3.19dB, -2.83dB, -2.73dB, -2.63dB, -2.43dB, -2.22dB B. -2.00dB, -1.96dB, -1.76dB, -1.51dB, -1.38dB, -1.25dB, -0.97dB, -0.79dB, -0.67dB, -0.51dB, -0.35 dB, -0.30dB, 0.38dB, 0.58dB, 0.79dB, 1.24dB, 1.25dB, 1.76dB, 2.34dB, 3.01dB, 4.26dB, 4.77dB or 6.02dB.

[0043] In the embodiment of the present application, the first network device can directly indicate the value of the power scaling factor to the first terminal device, so that the first terminal device can directly obtain the first power scaling factor, which is conducive to more accurate indication of the first power scaling factor and can also simplify the process of determining the power scaling factor by the first terminal device. In addition, the first power scaling factor may have more values, so that the embodiment of the present application can be applied to more communication scenarios.

[0044] In a fourth aspect, an embodiment of the present application provides a communication method, which can be executed by a first network device. The implementation method of the first network device can refer to the content of the first network device in the second aspect above, and the repeated parts are not listed again. The method includes: sending fifth information to the first terminal device, the fifth information indicating the value of the first power scaling factor, the value of the first power scaling factor is -4.39dB, -4.26dB, -4.19dB, -3.98dB, -3.83dB, -3.68dB, -3.52dB, -3.36dB, -3.27dB, -3.19dB, -2.83dB, -2.73dB, -2.63dB, -2.43dB, -2.22dB B. -2.00dB, -1.96dB, -1.76dB, -1.51dB, -1.38dB, -1.25dB, -0.97dB, -0.79dB, -0.67dB, -0.51dB, -0.35 dB, -0.30dB, 0.38dB, 0.58dB, 0.79dB, 1.24dB, 1.25dB, 1.76dB, 2.34dB, 3.01dB, 4.26dB, 4.77dB or 6.02dB.

[0045] In a fifth aspect, an embodiment of the present application provides a communication device, which may be the first terminal device in the first aspect above, or a software module or a hardware module (such as a chip) configured in the first terminal device, or a device capable of implementing the functions of the first terminal device. The communication device includes corresponding means (means) or modules for executing the first aspect or any optional implementation method above. For example, the communication device includes a transceiver module (sometimes also referred to as a transceiver unit), and a processing module (sometimes also referred to as a processing unit).

[0046] For example, the transceiver module is used to receive first information from the first network device under the control of the processing module, where the first information is used to indicate a first index of the first power scaling factor, and the first index is associated with (or corresponds to) the first power scaling factor.

[0047] Optionally, the above-mentioned communication device can also execute any possible implementation method in the first aspect above, which will not be listed again here.

[0048] In a sixth aspect, an embodiment of the present application provides a communication device, which may be the first network device in the second aspect above, or a software module or hardware module (such as a chip) configured in the first network device, or a device capable of implementing the functions of the first network device. The communication device includes corresponding means or modules for executing the second aspect or any optional implementation. For example, the communication device includes a transceiver module (sometimes also referred to as a transceiver unit), and a processing module (sometimes also referred to as a processing unit).

[0049] For example, the transceiver module is used to send first information to the first terminal device under the control of the processing module, where the first information is used to indicate a first index of the first power scaling factor, and the first index is associated with (or corresponds to) the first power scaling factor.

[0050] Optionally, the above-mentioned communication device can also execute any possible implementation method in the second aspect above, which will not be listed again here.

[0051] In a seventh aspect, an embodiment of the present application provides a communication device, which may be the first terminal device in the third aspect above, or a software module or a hardware module (such as a chip) configured in the first terminal device, or a device capable of implementing the functions of the first terminal device. The communication device includes corresponding means (means) or modules for executing the third aspect or any optional implementation. For example, the communication device includes a transceiver module (sometimes also referred to as a transceiver unit), and a processing module (sometimes also referred to as a processing unit).

[0052] For example, the transceiver module is used to receive fifth information from the first network device under the control of the processing module, where the fifth information indicates a value of a first power scaling factor, where the value of the first power scaling factor is -4.39dB, -4.26dB, -4.19dB, -3.98dB, -3.83dB, -3.68dB, -3.52dB, -3.36dB, -3.27dB, -3.19dB, -2.83dB, -2.73dB, -2.63dB, -2.43dB, -2.22dB, -2.00dB, -1.96dB, -1.76dB, -1.51dB, -1.38dB, -1.25dB, -0.97dB, -0.79dB, -0.67dB, -0.51dB, -0.35dB, -0.30dB, 0.38dB, 0.58dB, 0.79dB, 1.24dB, 1.25dB, 1.76dB, 2.34dB, 3.01dB, 4.26dB, 4.77dB, or 6.02dB.

[0053] Optionally, the above-mentioned communication device can also execute any possible implementation method in the third aspect above, which will not be listed again here.

[0054] In an eighth aspect, an embodiment of the present application provides a communication device, which may be the first network device in the fourth aspect above, or a software module or hardware module (such as a chip) configured in the first network device, or a device capable of implementing the functions of the first network device. The communication device includes corresponding means (means) or modules for executing the fourth aspect or any optional implementation. For example, the communication device includes a transceiver module (sometimes also referred to as a transceiver unit), and a processing module (sometimes also referred to as a processing unit).

[0055] For example, the transceiver module is used to send fifth information to the first terminal device under the control of the processing module, and the fifth information indicates the value of the first power scaling factor, and the value of the first power scaling factor is -3.98dB, -3.52dB, -1.76dB, 1.24dB or 3.01dB.

[0056] Optionally, the above-mentioned communication device can also execute any possible implementation method of the fourth aspect above, which will not be listed again here.

[0057] In the ninth aspect, an embodiment of the present application provides a communication device, comprising a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices outside the communication device and transmit them to the processor or send signals from the processor to other communication devices outside the communication device, and the processor is used to implement a method as described in any one of the first aspect, the second aspect, the third aspect or the fourth aspect through a logic circuit or executing code instructions.

[0058] In the specific implementation process, the communication device may be a chip, and the processor may be a transistor, a gate circuit, a trigger, and various logic circuits, etc. The embodiment of the present application does not limit the specific implementation method of the processor.

[0059] In one implementation, the communication device may be a wireless communication device, that is, a computer device supporting wireless communication functions. Specifically, the wireless communication device may be a terminal such as a smart phone, or a wireless access network device such as a base station.

[0060] In another implementation, the communication device may be a part of a wireless communication device, such as an integrated circuit product such as a system chip or a communication chip. The system chip may also be referred to as a system on chip (SoC), or simply as an SoC chip. The communication chip may include a baseband processing chip and a radio frequency processing chip. The baseband processing chip is sometimes also referred to as a modem or a baseband chip. The radio frequency processing chip is sometimes also referred to as a radio frequency transceiver or a radio frequency chip. In a physical implementation, some or all of the chips in the communication chip may be integrated inside the SoC chip. For example, the baseband processing chip is integrated in the SoC chip, and the radio frequency processing chip is not integrated with the SoC chip. The interface circuit may be a radio frequency processing chip in a wireless communication device, and the processor may be a baseband processing chip in a wireless communication device. The interface circuit may be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip or the chip system. The processor may also be embodied as a processing circuit or a logic circuit.

[0061] In the tenth aspect, an embodiment of the present application provides a communication device, comprising: a processor, the processor is coupled to a memory, the memory is used to store instructions, when the instructions are executed by the processor, the communication device executes any one of the methods described in the first aspect, the second aspect, the third aspect or the fourth aspect above.

[0062] In the eleventh aspect, an embodiment of the present application provides a computer program product comprising instructions, which, when executed by a communication device, enables the communication device to execute any of the methods described in the first aspect, the second aspect, the third aspect or the fourth aspect above.

[0063] In the twelfth aspect, an embodiment of the present application provides a computer-readable storage medium, in which a computer program or instruction is stored. When the computer program or instruction is executed by a communication device, the method described in any one of the first aspect, second aspect, third aspect or fourth aspect above is executed.

[0064] In a thirteenth aspect, an embodiment of the present application provides a chip system, the chip system comprising: a processor and an interface. The processor is used to call and run instructions from the interface, and when the processor executes the instructions, the method described in any one of the first aspect, the second aspect, the third aspect, or the fourth aspect is implemented.

[0065] In the fourteenth aspect, an embodiment of the present application provides a computer-readable storage medium, which is used to store computer programs or instructions. When the computer-readable storage medium is executed, it implements the method described in any one of the first, second, third or fourth aspects above.

[0066] In a fifteenth aspect, an embodiment of the present application provides a computer program product comprising instructions, which, when executed on a computer, implements the method described in any one of the first, second, third or fourth aspects above.

[0067] Regarding the beneficial effects of any technical solution in the above-mentioned second to fifteenth aspects, reference can be made to the beneficial effects discussion of the corresponding technical solution in the first or third aspect, and the repeated parts will not be listed here. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 A schematic diagram of a communication system applicable to an embodiment of the present application;

[0069] Figure 2 A schematic diagram of resource configuration for transmitting DMRS provided in an embodiment of the present application;

[0070] Figure 3 A schematic diagram of another resource configuration for transmitting DMRS provided in an embodiment of the present application;

[0071] Figure 4 A schematic diagram of resource configuration for transmitting DMRS provided in another embodiment of the present application;

[0072] Figure 5 A schematic diagram of another resource configuration for transmitting DMRS provided in an embodiment of the present application;

[0073] Figure 6 A schematic diagram of a communication method provided in an embodiment of the present application;

[0074] Figure 7 A schematic diagram of resources under DMRS Type 1 provided in an embodiment of the present application;

[0075] Figure 8 A schematic diagram of resources under DMRS Type 2 provided in an embodiment of the present application;

[0076] Fig. 9 A resource diagram of a DMRS and data provided in an embodiment of the present application;

[0077] Fig.10 Another resource diagram of DMRS and data provided in an embodiment of the present application;

[0078] Fig.11 A resource diagram of another DMRS and data provided in an embodiment of the present application;

[0079] Fig.12 Another resource diagram of DMRS and data provided in an embodiment of the present application;

[0080] Fig.13 Another resource diagram of DMRS and data provided in an embodiment of the present application;

[0081] Fig.14 Another resource diagram of DMRS and data provided in an embodiment of the present application;

[0082] Fig.15 A schematic diagram of another communication method provided in an embodiment of the present application;

[0083] Fig.16 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0084] Fig.17 A schematic diagram of the structure of another communication device provided in an embodiment of the present application;

[0085] Fig.18 A schematic diagram of the structure of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0086] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0087] In the embodiments of the present application, the number of nouns, unless otherwise specified, means "singular noun or plural noun", that is, "one or more". "At least one" means one or more, and "plural" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. For example, A / B means: A or B. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c means: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0088] In addition, the terms "including" and "having" mentioned in the embodiments of the present application are not exclusive. For example, a process, method, system, product or device including a series of steps or modules is not limited to the listed steps or modules, and may also include steps or modules that are not listed.

[0089] The solution provided in the embodiment of the present application can be applied to any communication system (or network) including a terminal device and a network device. The device involved in the embodiment of the present application may be a certain device, a software module in the device, or a hardware module (such as a chip) in the device. For example, the device for realizing the function of the terminal device may be a network device, or a device that can support the terminal device to realize the function, such as a chip system, which can be installed in the terminal device. In the technical solution provided in the embodiment of the present application, the device for realizing the function of the terminal device is a terminal device as an example for description. And, the device for realizing the function of the network device may be a network device, or a device that can support the network device to realize the function, such as a chip system, which can be installed in the network device. In the technical solution provided in the embodiment of the present application, the device for realizing the function of the network device is a network device as an example for description.

[0090] Please refer to Figure 1 , is a schematic diagram of a communication system applicable to an embodiment of the present application. The communication system includes at least one network device and at least one terminal device. Any network device in the at least one network device can communicate with the at least one terminal device. Optionally, any two terminal devices in the at least one terminal device can also communicate with each other. Figure 1 In the description, it is taken that at least one terminal device includes four terminal devices, namely a first terminal device, a second terminal device, a third terminal device and a fourth terminal device, and at least one network device includes one network device, namely a first network device, as an example.

[0091] A terminal device is a device with wireless transceiver functions. The terminal device can be a fixed device, a mobile device, a handheld device, a wearable device, a vehicle-mounted device, or a wireless device built into the above device (for example, a communication module or a chip system, etc.). The terminal device is used to connect people, objects, machines, etc., and can be widely used in various scenarios, such as but not limited to the following scenarios: cellular communication, device-to-device communication

[0092] The terminal equipment of the scenarios such as device-to-device (D2D), vehicle to everything (V2X), machine-to-machine / machine-type communications (M2M / MTC), Internet of Things (IoT), virtual reality (VR), augmented reality (AR), industrial control, self-driving, remote medical, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, drone, robot, etc. The terminal equipment may sometimes be referred to as user equipment (UE), terminal, access station, UE station, remote station, wireless communication equipment, or user device, mobile station (MS), subscriber unit, cellular phone, smart phone, car, tablet computer, smart speaker, train detector or gas station sensor, etc. The terminal device can be used to collect data, receive control information and downlink data from network equipment, send electromagnetic waves, or transmit uplink data to network equipment, etc., one or more of the above.

[0093] The first network device includes, for example, an access network element (or, referred to as an access network node), and / or a core network element (or, referred to as a core network node). The access network element is a device with a wireless transceiver function, which is used to communicate with the terminal device. The access network element includes, but is not limited to, a base station (BTS, Node B, eNodeB / eNB, or gNodeB / gNB) in the above-mentioned communication system, a transmission reception point (TRP), a base station of subsequent evolution of 3GPP, an access node in a wireless fidelity (WiFi) system, a wireless relay node, a wireless backhaul node, a satellite or a drone, etc. The base station can be: a macro base station, a micro base station, a pico base station, a small station, a relay station, etc. Multiple base stations can support the networks of the same access technology mentioned above, or they can support the networks of different access technologies mentioned above. The base station can include one or more co-sited or non-co-sited transmission and receiving points. The access network element may also be a wireless controller, a centralized unit (CU), also referred to as a convergence unit, and / or a distributed unit (DU) in a cloud radio access network (C(R)AN) scenario. The access network element may also be a server, a wearable device, or a vehicle-mounted device. For example, the access network element in the vehicle to everything (V2X) technology may be a road side unit (RSU). The following describes the access network element taking a base station as an example. The multiple access network elements in the communication system may be base stations of the same type or different types. The base station may communicate with a terminal device or communicate with the terminal device through a relay station. The terminal device may communicate with multiple base stations in different access technologies.

[0094] In a possible architecture of an access network device, the access network device includes a centralized unit (central unit, CU), and / or a distributed unit (distributed unit, DU). CU and DU can be understood as a division of the access network device from a logical function perspective. Among them, CU and DU can be physically separated or deployed together, and the embodiment of the present application does not specifically limit this. A CU can be connected to a DU, or multiple DUs can share a CU. The division of CU and DU can be divided according to the protocol stack, and one possible way is to deploy the radio resource control (radio resource control, RRC), service data adaptation protocol stack (service data adaptation protocol, SDAP) and packet data convergence protocol (packet data convergence protocol, PDCP) layer in the CU, and the remaining radio link control (radio link control, RLC) layer, media access control (media access control, MAC) layer and physical layer in the DU. In the embodiment of the present application, the division of CU and DU according to the above-mentioned protocol stack is not completely limited, and there may be other division methods, such as division according to service type.

[0095] The access network device in the embodiment of the present application may also refer to a centralized unit control plane (CU-CP) node or a centralized unit user plane (CU-UP) node, or include CU-CP and CU-UP. Among them, CU-CP is responsible for the control plane functions, mainly including RRC and PDCP-C. PDCP-C is mainly responsible for encryption and decryption, integrity protection, data transmission, etc. of the control plane data. CU-UP is responsible for user plane functions, mainly including SDAP and PDCP-U. Among them, SDAP is mainly responsible for processing the data of the core network and mapping the flow to the bearer. PDCP-U is mainly responsible for encryption and decryption, integrity protection, header compression, sequence number maintenance, data transmission, etc. of the data plane.

[0096] In different systems, CU (including CU-CP or CU-UP) or DU may have different names, but those skilled in the art can understand their meanings. For example, in an open radio access network (O-RAN) system, CU may also be called O-CU (open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, and CU-UP may also be called O-CU-UP.

[0097] The core network element is used to implement at least one of the functions of mobility management, data processing, session management, policy and billing. The names of the devices that implement the core network functions in systems with different access technologies may be different, and the embodiments of the present application do not limit this. Taking the 5G system as an example, the core network element includes: access and mobility management function (AMF), session management function (SMF) or user plane function (UPF), etc.

[0098] Below Figure 1 Taking the communication system shown as an example, the method of indicating the power scaling factor of DMRS based on DCI on the network side mentioned in the background technology is introduced.

[0099] The network device can indicate the antenna port corresponding to the DMRS currently scheduled by the terminal device through the value of the antenna port (antenna port(s)) field in the DCI. The antenna port corresponding to the DMRS can be referred to as the DMRS port (DMRSport). The terminal device can determine the antenna port corresponding to the terminal device and the number of code division multiplexing groups (number of code division multiplexing group CDM group(s) without data) where the DMRS symbol is located based on the value of the antenna port field and the pre-stored first table. CDM group(s) is obtained by dividing different DMRS ports in the frequency domain. The DMRS ports in the same CDM group are extended in the time and frequency domain using orthogonal cover codes (orthogonal cover code, OCC), so as to ensure the orthogonality on different ports. In the following, CDM group(s) is simply described as CDM groups. The symbols mentioned in the embodiments of the present application are, for example, orthogonal frequency division multiplexing (OFDM) symbols.

[0100] The first table includes multiple antenna ports, the number of CDM groups corresponding to each antenna port in the multiple ports, and the number of CDM groups that do not carry data transmission. The following takes the configuration type of DMRS as DMRS type 1 as an example to introduce the first table. Please refer to Table 1, which is an example of the first table.

[0101] Table 1

[0102]

[0103]

[0104] As shown in Table 1 above, when the value of the antenna port field is equal to 0, the DMRS port (s) index is 0, thereby determining that the antenna port is 1000 + 0 (ie, 1000), and the number of CDM groups that do not carry data is 1. When the value of the antenna port field is equal to 1, the DMRS port (s) index is 1, thereby determining that the antenna port is 1000 + 1 (ie, 1001), and the number of CDM groups that do not carry data is 1, and so on.

[0105] The terminal device can determine the power scaling factor corresponding to the DMRS based on the number of CDM groups that do not carry data and the second table. The second table includes the number of multiple CDM groups that do not carry data and the power scaling factor corresponding to the number of each CDM group that does not carry data. Please refer to Table 2 for an example of the second table.

[0106] Table 2

[0107]

[0108] As shown in Table 2 above, when the number of CDM groups that do not carry data is 1 and the DMRS configuration type is DMRS configuration type 1, the power scaling factor is 0dB. When the number of CDM groups that do not carry data is 2 and the DMRS configuration type is DMRS configuration type 1, the power scaling factor is -3dB. When the number of CDM groups that do not carry data is 3 and the DMRS configuration type is DMRS configuration type 1, there is no power scaling factor in this case. In Table 2, "-" indicates that there is no power scaling factor.

[0109] When the number of CDM groups that do not carry data is 1 and the DMRS configuration type is DMRS type 2, the power scaling factor is 0dB. When the number of CDM groups that do not carry data is 2 and the DMRS configuration type is DMRS configuration type 2, the power scaling factor is -3dB. When the number of CDM groups that do not carry data is 3 and the DMRS configuration type is DMRS type 1, the power scaling factor is -4.77dB.

[0110] It can be seen that the terminal device needs to parse the antenna port field in the DCI and perform a joint search based on the first table and the second table to determine the power scaling factor, which makes the method of determining the power scaling factor more cumbersome. With the continuous emergence of new communication scenarios, it is even more necessary to consider optimizing the method of indicating the power scaling factor.

[0111] In view of this, an embodiment of the present application provides a communication method, in which a network device (such as a first network device) may send a first message to a terminal device (such as a first terminal device), and the first information may be used to directly indicate an index (such as a first index) of a power scaling factor (such as a first power scaling factor). In this way, the first terminal device may directly determine the first power scaling factor based on the first index, providing a new way to indicate the power scaling factor. Since the first index directly indicates the first power scaling factor, accurate indication of the power scaling factor in different communication scenarios is achieved, which is beneficial to improving communication quality. Moreover, in this method, since the first terminal device does not need to jointly search for the power index factor based on multiple tables, the process of determining the power scaling factor can be simplified.

[0112] Combine the following Figures 2 to 5 The schematic diagram of resource configuration for transmitting DMRS is shown, and an example is given of possible resource configurations of DMRS of multiple terminal devices involved in the embodiments of the present application. Figures 2 to 5 The example in which the terminal device is taken as UE is introduced. Figures 2 to 5 The UE1 to UE4 involved can refer to Figure 1 The first terminal device to the fourth terminal device.

[0113] Figure 2 A resource configuration for transmitting DMRS is illustrated, for example, a resource configuration for transmitting DMRS in a single user (SU) scenario. In the SU scenario, DMRSs of different UEs occupy different time domain resources, and data of different UEs also occupy different time domain resources. For ease of distinction, the SU scenario is referred to as the third scenario (or the third scenario) hereinafter.

[0114] like Figure 2 As shown, the DMRS of UE1 occupies symbol 0 of a time slot, and the data of UE1 occupies symbols 1 and 2 of the time slot. The DMRS of UE2 occupies symbol 3 of the time slot, and the data of UE2 occupies symbols 4 and 5 of the time slot. The DMRS of UE3 occupies symbol 6 of a time slot, and the data of UE3 occupies symbols 7 and 8 of the time slot. The DMRS of UE4 occupies symbol 9 of a time slot, and the data of UE4 occupies symbols 10 and 11 of the time slot. Among them, symbol 0, symbol 3, symbol 6 and symbol 9 can be regarded as DMRS symbols.

[0115] Figure 3 Another resource configuration for transmitting DMRS is illustrated, for example, resource configuration for transmitting DMRS in a multi-user (MU) scenario. In the MU scenario, DMRSs of different UEs occupy exactly the same time domain resources, and data of different UEs also occupy exactly the same time domain resources. For ease of distinction, the MU scenario is referred to as the fourth scenario or the fourth scenario below.

[0116] like Figure 3 As shown, the DMRSs of UE1 to UE4 all occupy symbol 0 of a time slot, and the data of UE1 to UE4 all occupy symbols 1 and 2 of the time slot.

[0117] Figure 4 Another resource configuration for transmitting DMRS is illustrated, for example, the resource configuration of DMRS in the SU time division scenario sharing the same DMRS symbol. In the SU time division scenario sharing the same DMRS symbol, the DMRS of different UEs occupy the same time domain resources (wherein different UEs may occupy different DMRS ports), and the data of different UEs also occupy completely different time domain resources. For the sake of distinction, the SU time division scenario sharing the same DMRS symbol is referred to as the first case or the first case below.

[0118] like Figure 4 As shown, the DMRSs of UE1 to UE4 all occupy symbol 0 of a time slot. The data of UE1 occupies symbols 3 and 4 of the time slot. The data of UE2 occupies symbols 5 and 6 of the time slot. The data of UE3 occupies symbols 7 and 8 of the time slot. The data of UE4 occupies symbols 9 and 10 of the time slot.

[0119] Figure 5 FIG. 4 illustrates another resource configuration for transmitting DMRS. Figure 5 As shown in FIG. 1 , DMRSs of different UEs occupy the same time domain resources (different UEs may occupy different DMRS ports), and data of different UEs occupy different time domain resources. The fact that data of different UEs occupy different time domain resources can be understood as the fact that data of a certain UE occupies the same time domain resources as data of some of the remaining UEs, and occupies different time domain resources from data of another part of the remaining UEs. Figure 5 The scenario shown is called the second case or situation 2.

[0120] like Figure 5As shown, the DMRS of UE1 to UE4 all occupy symbol 0 of a time slot. The data of UE1 and the data of UE2 both occupy symbol 3 of the time slot, that is, the data of UE1 and the data of UE2 occupy the same time domain resources. The data of UE3 occupies symbol 4 of the time slot, and the data of UE4 occupies symbol 5 of the time slot, that is, the data of UE1 and the data of UE3 occupy different time domain resources, and the data of UE1 and the data of UE4 also occupy different time domain resources.

[0121] The following describes the method provided by the embodiments of the present application in conjunction with the accompanying drawings. In the accompanying drawings corresponding to the various embodiments of the present application, all steps indicated by dotted lines are optional steps. Also, the first terminal device involved in the various embodiments of the present application is, for example, Figure 1 the first terminal device concerned, or Figures 2 to 5 Any of the UEs involved, and the second terminal device, for example Figure 1 the second terminal device concerned, or Figures 2 to 5 In addition, if the technical solutions provided in the embodiments of the present application are applied to other communication systems, the name and / or function of the device may be changed, and there is no limitation on this.

[0122] Please refer to Figure 6 , which is a schematic diagram of a communication method provided in an embodiment of the present application. Figure 6 Multiple steps from S601 to S607 are illustrated, and each step is introduced below.

[0123] S601: A first network device sends second information to a first terminal device. Correspondingly, the first terminal device receives the second information from the first network device.

[0124] The second information may be preconfigured or predefined in the first network device, for example, it may be a protocol preconfigured or predefined in the first network device. Alternatively, the second information may be determined by negotiation between the first network device and the first terminal device. Alternatively, the second information may be determined by the first network device itself. The embodiment of the present application does not specifically limit the manner in which the first network device determines the second information.

[0125] Optionally, the second information may be carried (or carried) in radio resource control (RRC) signaling, for example, the second information may be carried in a second parameter of the RRC. The second parameter is, for example, a newly added parameter in the RRC, such as the DMRS scaling factor (dmrs-scalingfactor) in the DMRS downlink configuration (DMRS-DownlinkConfig) IE. The maximum number of power scaling factors supported by the first network device may be determined by a third parameter in the RRC, such as the maximum DMRS scaling factor (maxNrofdmrs-scalingfactor) parameter. Alternatively, the second information may be carried in proprietary signaling. The embodiment of the present application does not limit the signaling that carries the second information.

[0126] The second information may include a plurality of indices and a plurality of power scaling factors. Each index in the plurality of indices is associated with (or corresponds to) a power scaling factor in the plurality of power scaling factors. Any index in the plurality of indices may be considered as an index of a power scaling factor.

[0127] The power scaling factor may be expressed in decibel form. In this case, the multiple power scaling factors may include, for example, -4.39 decibels (dB), -4.26dB, -4.19dB, -3.98dB, -3.83dB, -3.68dB, -3.52dB, -3.36dB, -3.27dB, -3.19dB, -2.83dB, -2.73dB, -2.63dB, -2.43dB, -2.22dB, -2.00dB, - At least one of 1.96dB, -1.76dB, -1.51dB, -1.38dB, -1.25dB, -0.97dB, -0.79dB, -0.67dB, -0.51dB, -0.35dB, -0.30dB, 0.38dB, 0.58dB, 0.79dB, 1.24dB, 1.25dB, 1.76dB, 2.34dB, 3.01dB, 4.26dB, 4.77dB, 6.02dB. Optionally, the multiple power scaling factors also include 0dB, -3dB and -4.77dB.

[0128] Alternatively, the power scaling factor may also be directly expressed in fractional form. In this case, multiple power scaling factors may include, for example, at least one of 2, 1, 3, 4, 1, 1 / 3, 3 / 2, 1 / 2, 3 / 4, 4 / 5, 2 / 3, 6 / 5, 12 / 7, 3 / 5, 12 / 11, 6 / 7, 12 / 17, 4 / 7, 2 / 5, 1 / 4, 15 / 4, 15 / 6, 9 / 8, 2 / 5, 4 / 9, 1 / 3, 1, 4 / 3, 2, and 1 / 3. The decibel value of the same power scaling factor may be equal to 10*lgx, where x represents the fractional value of the power scaling factor. For example, 2 / 5 corresponds to -3.98dB, -3.52dB corresponds to 4 / 9, -1.76dB corresponds to 1 / 3, 0dB corresponds to 1, 1.24dB corresponds to 4 / 3, 3.01dB corresponds to 2, and -4.77dB corresponds to 1 / 3.

[0129] It should be understood that the embodiments of the present application do not limit the expression form of the power scaling factor. The power scaling factor can be expressed in decimal form, fractional form, or logarithmic form, and the embodiments of the present application do not limit this. And the embodiments of the present application are in decibels, and the power scaling factor is expressed with two decimal places after the decimal point. In fact, the dB value corresponding to the power scaling factor can be retained to an integer, one decimal place, two decimal places, or other, and the embodiments of the present application do not limit the value accuracy of the power scaling factor.

[0130] For example, please refer to Table 3, which is an example of second information provided in an embodiment of the present application.

[0131] Table 3

[0132] index Power scaling factor (dB) 0 -4.77 1 -3.98 2 -3.52 3 -3.01 4 -1.76 5 0 6 1.24 (optional) 7 3.01 (optional)

[0133] Table 3 above is a plurality of multiple indices including eight indices 0 to 7, and the plurality of power scaling factors include -4.77dB, -3.98dB, -3.52dB, -3.01dB, -1.76dB, 0dB, 1.24dB and 3.01dB. Index 0 is associated with a power scaling factor of -4.77dB, index 1 is associated with a power scaling factor of -3.98dB, index 2 is associated with a power scaling factor of -3.52dB, index 3 is associated with a power scaling factor of -3.01dB, index 4 is associated with a power scaling factor of -1.76dB, index 5 is associated with 0dB, index 6 is associated with 1.24dB, and index 7 is associated with 3.01dB.

[0134] The power scaling factors noted as "optional" in Table 3 are optional. This is because in actual communications, reducing the DMRS power will damage the channel estimation performance, thereby affecting the communication transmission. Therefore, compared to reducing the DMRS power, the first network device can reduce part of the data transmission power and compensate this part of the power to the DMRS. Therefore, reducing the DMRS power by the power scaling factor is an optional operation.

[0135] In a possible implementation, the second information may also include a configuration type of DMRS associated (or corresponding) to each power scaling factor in a plurality of power scaling factors. The configuration type of DMRS may include, for example, a first configuration type and a second configuration type. The first configuration type is different from the second configuration type. For example, the configuration type of DMRS may be divided according to the maximum number of DMRS ports supported by DMRS, for example, the number of DMRS ports supported by the second configuration type is greater than the number of DMRS ports supported by the first configuration type. For example, the first configuration type is, for example, DMRS Type 1, and the second configuration type is, for example, DMRS Type 2.

[0136] For example, DMRS Type 1 supports configuration of up to 4 orthogonal ports when using a single DMRS symbol and up to 8 orthogonal ports when using a double DMRS symbol; DMRS Type 2 supports configuration of up to 6 orthogonal ports when using a single DMRS symbol and up to 12 orthogonal ports when using a double DMRS symbol. Alternatively, DMRS Type 1 supports configuration of up to 8 ports and DMRS Type 2 supports configuration of up to 12 ports.

[0137] Please refer to Figure 7 , is a schematic diagram of resources under DMRS Type 1 provided in an embodiment of the present application. Figure 7 As shown, a single symbol can be divided into CDM group0 and CDM group1, CDM group0 corresponds to DMRS port P0 or P1, and CDM group1 corresponds to DMRS port P2 or P3. A double symbol is divided into CDM group0 and CDM group1, CDM group0 corresponds to DMRS port P0, P1, P4 or P5, and CDM group1 corresponds to DMRS port P2, P3, P6 or P7.

[0138] Please refer to Figure 8 , is a schematic diagram of resources under DMRS Type 2 provided in an embodiment of the present application. Figure 8As shown, a single symbol can be divided into CDM group0, CDM group1 and CDM group2, CDM group0 corresponds to DMRS port P0 or P1, CDM group1 corresponds to DMRS port P2 or P3, and CDM group2 corresponds to DMRS port P4 or P5. Double symbols are divided into CDM group0, CDM group1 and CDM group3, CDM group0 corresponds to DMRS port P0, P1, P6 or P7, CDM group1 corresponds to DMRS port P2, P3, P8 and P9, and CDM group1 corresponds to DMRS port P4, P5, P10 or P11.

[0139] Alternatively, the first configuration type is DMRS e-Type 1, and the second configuration type may also be, for example, e-Type 2. DMRS e-Type 1 supports a maximum configuration of 16 ports, and DMRS e-Type 2 supports a maximum configuration of 24 ports. It should be understood that with the continuous evolution of the standard, there may be multiple configuration types for DMRS, and the embodiments of the present application do not specifically limit this.

[0140] Please refer to Table 4, which is an example of second information provided in an embodiment of the present application.

[0141] Table 4

[0142]

[0143] As shown in Table 4 above, the multiple indexes include eight indexes from 0 to 7, and the multiple power scaling factors include -4.77dB, -3.98dB, -3.52dB, -3.01dB, -1.76dB, 0dB, 1.24dB and 3.01dB. In the first configuration type, index 0 is associated with a power scaling factor of -3.01dB, index 1 is associated with a power scaling factor of -1.76dB, index 2 is associated with a power scaling factor of 0dB, index 3 is associated with a power scaling factor of 3.01dB, and indexes 4 to 7 are not associated with power scaling factors, which are indicated by "-" in Table 4.

[0144] Under the second configuration type, index 0 is associated with a power scaling factor of -4.77dB, index 1 is associated with a power scaling factor of -3.98dB, index 2 is associated with a power scaling factor of -3.52dB, index 3 is associated with a power scaling factor of -3.01dB, index 4 is associated with a power scaling factor of -1.76, index 5 is associated with a power scaling factor of 0dB, index 6 is associated with 1.24dB, and index 7 is associated with 3.01dB.

[0145] The power scaling factors noted as "optional" in Table 4 are optional.

[0146] Optionally, the power scaling factor may be associated with the number of CDM groups of the DMRS that do not carry data. The number of CDM groups of the DMRS that do not carry data includes 1, 2, 3, and the like.

[0147] Please refer to Table 5, which is an example of second information provided in an embodiment of the present application.

[0148] Table 5

[0149]

[0150] Please refer to Table 6, which is an example of second information provided in an embodiment of the present application. Different from Table 5, Table 6 uses indexes for consecutive numbering.

[0151] Table 6

[0152]

[0153] The power scaling factors noted as "optional" in Tables 5 and 6 are optional.

[0154] As shown in Tables 5 and 6 above, the multiple indexes include three indexes from 1 to 3, and the multiple power scaling factors include -4.77dB, -3.98dB, -3.52dB, -3.01dB, -1.76dB, 0dB, 1.24dB and 3.01dB.

[0155] As shown in Tables 5 and 6 above, the number of CDM groups of DMRS that do not carry data is 1, the configuration type of DMRS is the first configuration type, and the resource configuration of DMRS is the same as the third case above (as shown in the above Figure 2 ) or the fourth case (as above Figure 3 ), the corresponding power scaling factor is 0dB. When the number of CDM groups of DMRS that do not carry data is 2, the configuration type of DMRS is the first configuration type, and the resource configuration of DMRS is as in the third or fourth case above, the corresponding power scaling factor is -3dB. When the number of CDM groups of DMRS that do not carry data is 3, the configuration type of DMRS is the first configuration type, and the resource configuration of DMRS is as in the third or fourth case above, there is no corresponding power scaling factor.

[0156] The number of CDM groups of the DMRS that does not carry data is 1, the configuration type of the DMRS is the second configuration type, and the resource configuration of the DMRS is the same as the third case above (as in the above Figure 2 ) or the fourth case (as above Figure 3), the corresponding power scaling factor is 0dB. When the number of CDM groups of DMRS that do not carry data is 2, the configuration type of DMRS is the second configuration type, and the resource configuration of DMRS is as in the third or fourth case above, the corresponding power scaling factor is -3dB. When the number of CDM groups of DMRS that do not carry data is 3, the configuration type of DMRS is the second configuration type, and the resource configuration of DMRS is as in the third or fourth case above, the corresponding power scaling factor is -4.77dB.

[0157] The number of CDM groups of the DMRS that does not carry data is 1, the configuration type of the DMRS is the first configuration type, and the resource configuration of the DMRS is the same as the first case above (as in the above Figure 4 ) or the second case (as mentioned above Figure 5 ), the corresponding power scaling factor is 3.01dB. When the number of CDM groups of DMRS that do not carry data is 2, the configuration type of DMRS is the first configuration type, and the resource configuration of DMRS is as in the first or second case above, the corresponding power scaling factor is -1.76dB, 0dB or 3.01dB. When the number of CDM groups of DMRS that do not carry data is 3, the configuration type of DMRS is the first configuration type, and the resource configuration of DMRS is as in the third or fourth case above, there is no corresponding power scaling factor.

[0158] When the number of CDM groups of DMRS that do not carry data is 1, the configuration type of DMRS is the second configuration type, and the resource configuration of DMRS is as in the first or second case described above, the corresponding power scaling factor is 0dB. When the number of CDM groups of DMRS that do not carry data is 3.01dB, -1.76dB or 0dB, the configuration type of DMRS is the second configuration type, and the resource configuration of DMRS is as in the first or second case described above, the corresponding power scaling factor is -3dB. When the number of CDM groups of DMRS that do not carry data is 3, the configuration type of DMRS is the second configuration type, and the resource configuration of DMRS is as in the first or second case described above, the corresponding power scaling factor is -3.98dB, -3.52dB, -3.01dB, -1.76dB, 0dB, 1.25dB or 3.01dB.

[0159] It should be understood that Tables 3 to 6 are examples of the second information and do not limit the form and specific content of the second information.

[0160] In S601, the example of the first network device sending the second information to the first terminal device is used for introduction. In fact, the first network device and the first terminal device may also be pre-configured or pre-defined with the second information. For example, the first network device and the first terminal device may be pre-configured or pre-defined with the second information through a protocol. In this case, there is no need to perform step S601, that is, S601 is an optional step. Figure 6 Indicated by dotted line.

[0161] In a possible implementation, when the configuration type of the first DMRS is different, the multiple power scaling factors included in the second information may also be different. In other words, the multiple power scaling factors are associated with the configuration type of the first DMRS. In the embodiment of the present application, the DMRS corresponding to the first terminal device is taken as an example as the first DMRS. The DMRS corresponding to the terminal device may be, for example, a DMRS sent by the first network device to the first terminal device, and may also be regarded as a DMRS received by the first terminal device.

[0162] Optionally, the first DMRS is, for example, a front loaded (FL) DMRS or an additional (ADD) DMRS, and the present application does not limit the type of the first DMRS. FL DMRS is usually located in the first few symbols in a time slot and supports the configuration of 1 to 2 symbols; ADD DMRS is used to improve the accuracy of channel estimation in medium and high speed mobile scenarios.

[0163] Exemplarily, if the configuration type of the first DMRS is the first configuration type, then the multiple power scaling factors may include {-4.77, -3.98, -3.52, -3.01, -1.76, 0}; if the configuration type of the first DMRS is the second configuration type, then the multiple power scaling factors may include {-3.01, -1.76, 0}.

[0164] S602: The first network device sends third information to the first terminal device. Correspondingly, the first terminal device receives the third information from the first network device.

[0165] The second information and the third information may be carried in the same signaling, for example, the second information and the third information may be carried in RRC signaling, in which case the first network device sending the RRC signaling to the first terminal device is equivalent to sending the second information and the third information. Alternatively, the second information and the third information may also be carried in different signalings.

[0166] The third information indicates the configuration type of the first DMRS. For example, the third information indicates that the configuration type of the first DMRS is the first configuration type or the second configuration type. Optionally, the third information may also indicate the time domain resource configuration of the first DMRS. For example, the third information indicates the mapping method of the physical channel (such as PDSCH) mapped by the first DMRS, the starting symbol index and symbol length of the DMRS. The mapping method of the physical channel mapped by the first DMRS, the starting symbol index and symbol length of the DMRS are used to determine the time domain resource configuration of the first DMRS.

[0167] It should be understood that, when the configuration type of the first DMRS of the first terminal device is relatively fixed, or when the first terminal device has obtained the configuration type of the first DMRS, the first network device may not need to indicate the configuration type of the first DMRS to the first terminal device, that is, S602 is an optional step. Figure 6 Indicated by dotted line.

[0168] S603: The first network device sends fourth information to the first terminal device. Correspondingly, the first terminal device receives the fourth information from the first network device.

[0169] The fourth information may be carried in downlink control signaling (DCI) or other signaling. For example, the fourth information may be carried in the Antenna port(s) field of the DCI. The fourth information is used to indicate the first parameter. The first parameter is the number of CDM groups of the first DMRS that does not carry the first data. The first data may be data corresponding to (or associated with) the first DMRS, and the first data may be carried, for example, on a physical channel (such as PDSCH) mapped to the first DMRS. In other words, the first data and the first DMRS may be mapped on the same physical channel.

[0170] S604: The first network device sends first information to the first terminal device. Correspondingly, the first terminal device receives the first information from the first network device.

[0171] The first information may also be carried in DCI or other signaling, and the embodiment of the present application does not impose specific restrictions on this. The first information may indicate a first index of the first power scaling factor. Optionally, the first information and the fourth information may be carried in the same signaling, or in different signaling.

[0172] Exemplarily, the first network device may determine a first index of a first power scaling factor of the first terminal device, and carry the first index in the first information. For example, the first network device may determine a first index corresponding to the first power scaling factor based on the second information. The first index belongs to a power scaling factor among multiple indexes, and the first power scaling factor is a power scaling factor among multiple power scaling factors.

[0173] The manner in which the first network device indicates the first index may include any one of the following A1 to A5, which are respectively introduced below.

[0174] A1. N bits in the first information carry a first index. N is a positive integer, and the value of N is 3, for example.

[0175] In A1, the first network device uses a fixed number of bits to carry the first index, so that it is simpler for the first network device to carry the first index, and also simplifies the process of the first terminal device parsing the first information.

[0176] Optionally, the value of N bits is the first index. Taking the second information as the second information shown in Table 3 above as an example, the first network device determines that the first power scaling factor is 1.24dB, then the first network device determines the first index to be 6 based on Table 3 above, and therefore determines that N bits can be 110.

[0177] A2. When the configuration type of the first DMRS is the first configuration type, the first network device may use K bits in the first information to carry the first index, and when the configuration type of the first DMRS is the second configuration type, the first network device may use L bits in the first information to carry the first index. L and K are both positive integers, and the value of L is greater than the value of K. For example, the value of K is 2, and the value of L is, for example, 3.

[0178] Under A2, it is applicable to the case where the second information also includes the configuration type of the DMRS. For example, the second information can refer to the content of Table 4 above. If the configuration type of the first DMRS is the first configuration type, the first network device can determine to use 2 bits to carry the first index, and if the configuration type of the first DMRS is the second configuration type, the first network device can determine to use 3 bits to carry the first index.

[0179] In this manner, the first network device can dynamically use dynamic bits to indicate the first information, which can relatively save the number of bits occupied by the first information.

[0180] A3. When the first power scaling factor belongs to a first type of power scaling factor, the first index is carried in a first field of the first information, and when the first power scaling factor belongs to a second type of power scaling factor, the first index is carried in a second field of the second information. The first field and the second field are different.

[0181] The first type of power scaling factor includes the power scaling factor of the first case and / or the second case in which the resource configuration of the DMRS is included. The second type of power scaling factor includes the power scaling factor of the third case and / or the fourth case in which the resource configuration of the DMRS is included. The third method is applicable to the case where the second information also includes a CDM group of a DMRS that does not carry data.

[0182] Optionally, the first information is carried in the DCI, the first field may be the antenna port field in the DCI, and the second field may be, for example, a newly added field in the DCI.

[0183] A4. If the first power scaling factor belongs to the first category of power scaling factors, the first index may be carried in N bits of the first field of the first information. Alternatively, if the second category of power scaling factors belongs to the second category of power scaling factors, the first index may be carried in N bits of the second field of the first information.

[0184] A5. If the first power scaling factor belongs to the first category of power scaling factors, and the configuration type of the first DMRS is the first configuration type, then the first index may be carried in K bits of the first field of the first information. Alternatively, if the first power scaling factor belongs to the first category of power scaling factors, and the configuration type of the first DMRS is the second configuration type, then the first index may be carried in L bits of the first field of the first information. Alternatively, if the first power scaling factor belongs to the second category of power scaling factors, and the configuration type of the first DMRS is the first configuration type, then the first index may be carried in K bits of the second field of the first information. Alternatively, if the first power scaling factor belongs to the second category of power scaling factors, and the configuration type of the first DMRS is the second configuration type, then the first index may be carried in L bits of the second field of the first information. The method shown in A5 above can be regarded as a combination of the methods shown in A3 and A2.

[0185] It should be understood that the above A1 to A5 are examples of the way in which the first network device indicates the first index. In fact, there are many other ways to indicate the first index, which are not specifically limited in the embodiments of the present application.

[0186] In a possible implementation, the first network device may further indicate information of the port of the first DMRS to the first terminal device, for example, an index of the port of the first DMRS. For example, the first network device may indicate the port of the first DMRS through the Antenna port(s) field in the DCI.

[0187] S605. The first terminal device determines a first power scaling factor according to the first information.

[0188] The first terminal device may determine the first index based on the first information, and determine the first power scaling factor based on the first index. For example, the first terminal device determines the power scaling factor associated with (or corresponding to) the first index from the second information, wherein the power scaling factor associated with the first index is the first power scaling factor. The first terminal device may obtain the second information from the first network device, or may preconfigure or predefine the second information. The content of the second information may refer to the content of the second information discussed in S601 above, and will not be repeated here.

[0189] For example, if the second information is the second information shown in Table 3 above, and the value of the first index is 1, the first terminal device can determine that the first power scaling factor is -3.98dB. Alternatively, if the second information is the second information shown in Table 4 above, the value of the first index is 2, and the configuration type of the first DMRS is the first configuration type, then the first terminal device determines that the first power scaling factor is 0dB. Alternatively, if the second information is the second information shown in Table 5 above, and the first terminal device determines that the first information does not include the second field, then based on the first field, it can be determined that the first index is 2, and the configuration type of the first DMRS is the first configuration type, so the first power scaling factor can be determined to be -3dB.

[0190] Wherein, the manner in which the first network device indicates the first index is different, and the manner in which the first terminal device determines the first power scaling factor is also different, which are respectively introduced below.

[0191] B1. When the first network device indicates the first index in the manner shown in A1 above, the first terminal device may obtain the first index based on N bits in the first information.

[0192] Among them, at least two of the number of bits occupied by the first index in the first information, the starting bit position occupied by the first index in the first information, and the ending bit position occupied by the first index in the first information can be pre-configured or pre-defined in the first terminal device, or can be determined by negotiation between the first terminal device and the first network device.

[0193] B2. When the first network device indicates the first index in the manner shown in A2 above, if the configuration type of the first DMRS is the first configuration type, the first terminal device may determine the first index based on K bits in the first information. And, if the configuration of the first DMRS is the second configuration type, the first terminal device may determine the first index based on L bits in the first information. Optionally, the first terminal device may determine the configuration type of the first DMRS based on third information.

[0194] B3. When the first network device indicates the first index in the manner shown in A3 above, if the first information includes the first field, the first information does not include the second field or the second field is empty, then the first terminal device can obtain the first index based on the first field. If the first information includes the second field, the first information does not include the first field or the first field is empty, then the first terminal device can obtain the first index based on the second field.

[0195] B4. When the first network device indicates the first index in the manner shown in A4 above, if the first information includes the first field, the first information does not include the second field or the second field is empty, then the first terminal device can obtain the first index based on N bits of the first field. If the first information includes the second field, the first information does not include the first field or the first field is empty, then the first terminal device can obtain the first index based on N bits of the second field.

[0196] B5. In the case where the first network device indicates the first index in the manner shown in A5 above, if the first information includes the first field, the first information does not include the second field or the second field is empty, and the configuration type of the first DMRS is the first configuration type, then the first terminal device can obtain the first index according to the K bits in the first field of the first information. Alternatively, if the first information includes the first field, the first information does not include the second field or the second field is empty, and the configuration type of the first DMRS is the second configuration type, then the first terminal device can obtain the first index according to the L bits in the first field of the first information. Alternatively, if the first information includes the second field, the first information does not include the first field or the first field is empty, and the configuration type of the first DMRS is the first configuration type, then the first terminal device can obtain the first index according to the K bits in the second field of the first information. Alternatively, if the first information includes the second field, the first information does not include the first field or the first field is empty, and the configuration type of the first DMRS is the second configuration type, then the first terminal device can obtain the first index according to the L bits in the second field of the first information.

[0197] It should be understood that the above B1 to B5 are examples of how the first terminal device determines the first index. In fact, there are many other ways to indicate the first index, which are not specifically limited in the embodiments of the present application.

[0198] In a possible implementation, when the second information also includes the configuration type of DMRS, the first terminal device can directly determine the configuration type of the first DMRS from the second information based on the first index. In this case, there is no need for the network device to separately indicate the configuration type of the first DMRS to the first terminal device. Similarly, when the second information also includes the number of CDM groups of DMRS that do not carry data, the first terminal device can directly determine the number of CDM groups of the first DMRS that do not carry the first data from the second information based on the first index. In this case, there is no need for the network device to separately indicate the first parameter (i.e., the number of CDM groups of the first DMRS of the first data) to the first terminal device.

[0199] S606: The first network device sends a first PDSCH to the first terminal device. Correspondingly, the first terminal device receives the first PDSCH from the first network device.

[0200] In the embodiment of the present application, the mapping of the first DMRS to the first PDSCH is taken as an example. Under this assumption, the first PDSCH can carry the first DMRS and the first data.

[0201] S607. The first terminal device demodulates the first PDSCH based on the first power scaling factor.

[0202] The first terminal device can determine the actual power of receiving the first DMRS, and determine the power of receiving the first data based on the first power scaling factor and the actual power of receiving the first DMRS, and then equalize and demodulate the first data based on the power of receiving the first data.

[0203] In a possible implementation, the first power scaling factor may be preconfigured or predefined in the first network device, or may be determined by the first network device itself according to the relevant configuration of DMRS (such as DMRS occupied CDM group and DMRS port, etc.). The following describes the method for the first network device to determine the first power scaling factor in different situations.

[0204] C1, the first parameter (ie, the number of CDM groups of the first DMRS that do not carry the first data) is 1, and the CDM groups of the first DMRS that do not carry the first data include the first CDM group.

[0205] If the first DMRS only occupies the first CDM group, the first power scaling factor is the ratio of the first port number to the second port number. The first DMRS only occupies the first CDM group, indicating that the first DMRS does not occupy CDM groups other than the first CDM group. Among them, the first port number is the number of occupied ports in the first CDM group. And the second port number is the number of ports occupied by the first data. The number of occupied ports in a CDM group refers to the number of ports used in the CDM group, which may include the ports in the CDM group occupied by the first DMRS, and the ports in the CDM group occupied by other terminal devices (such as the second terminal device), etc.

[0206] For example, for the scenario where the number of CDM group(s) without data of DMRS Type 1 and which does not carry data is 1, the first data and the first DMRS multiplex the same symbol for transmission, the number of CDM groups to which the first data can be mapped to DMRS is 1, and a resource unit of the first DMRS, for example, a resource element (RE), supports a maximum of 2 orthogonal ports to be configured.

[0207] If the first data transmission is configured with one port, then there are two possible values ​​of the first power scaling factor, which are introduced below.

[0208] The first one, please refer to Fig. 9 , is a schematic diagram of DMRS and data resources provided in an embodiment of the present application. Fig. 9 As shown, the first DMRS of the first terminal device occupies one port of the first CDM group, and the first data occupies another port of the first CDM group, so the DMRS also includes a complete CDM group that is not occupied. For the first terminal device, each RE where the first DMRS is located corresponds to 2 ports, and each RE where the first data is located corresponds to 1 port. The power normalization coefficient (energy per resource elemen, EPRE) of the first DMRS is P DMRS =0.5, the normalized power P of the first data PDSCH =1, so the first power scaling factor 2, which means 3dB.

[0209] For the second type, please refer to Fig.10 , is a schematic diagram of DMRS and data resources provided in an embodiment of the present application. Fig.10As shown, the first terminal device occupies one port, the first DMRS occupies one port of the first CDM group, and the second CDM group is not occupied. For the first terminal device, each RE where the first DMRS is located corresponds to one port, and each RE where the first data is located corresponds to one port, so the normalized power P of the first DMRS is DMRS =1, the normalized power P of the first data PDSCH =1, so the first power scaling factor That is 0dB.

[0210] If two ports are configured for the first data transmission, then there is a possible value for the first power scaling factor, which is introduced below.

[0211] The first terminal device occupies 2 ports due to data multiplexing. Fig.11 , which is a resource diagram of DMRS and data provided in an embodiment of the present application. At this time, there may be two situations: one is that the two ports of the first terminal device are respectively occupied in two different CDM groups, and the other ports are occupied by the first data; the other situation is that the two ports of the first terminal device are occupied in the same CDM group, and the other CDM group is occupied by the first data. For the first terminal device, in these two situations, each RE where the first DMRS is located corresponds to two ports, and each RE where the first data is located corresponds to two ports. Therefore, in these two situations, the power normalization coefficients of each port of the first data and the first DMRS are equal, and the normalized power P of the first DMRS is equal to 0. DMRS =0.5, the normalized power of the first data is P PDSCH =0.5, so the first power scaling factor That is 0dB.

[0212] C2. The value of the first number is 2, and the CDM group of the first DMRS that does not carry the first data includes the first CDM group and the second CDM group.

[0213] C2-1. When the first DMRS occupies only the first CDM group and the second CDM group is not occupied, the first power scaling factor is half of the ratio of the number of first ports to the number of second ports.

[0214] C2-2. When the first DMRS only occupies the first CDM group and the second CDM group is occupied, the first power scaling factor is the ratio of the number of first ports to the number of second ports.

[0215] The second CDM group in C2-2 is occupied, which means that the second CDM group is occupied by the DMRS corresponding to other terminal devices (such as the second terminal device) or the first data.

[0216] C2-3. When the first DMRS occupies only the first CDM group and the second CDM group, the first power scaling factor is the ratio of the first product to the first sum. The first product is the product of the first port number and the third port number, the first sum is the sum of the first port number and the third port number, and the third port number is the number of occupied ports in the second CDM group.

[0217] For example, the number of CDM groups for DMRS Type 1 that do not carry data is 2, and the CDM groups that do not carry data specifically include a first CDM group and a second CDM group, which means that the first data does not multiplex the CDM group of DMRS.

[0218] If one port is configured for data transmission of UE1, the first power scaling factor may have the following three possible values, which are introduced below respectively.

[0219] The first type is that there is only the first terminal device, and the first DMRS occupies one port of the first CDM group, so the second CDM group is not occupied, so the power on the non-DMRS RE is superimposed on the first DMRS RE, so that the first DMRS EPRE of each port is twice the EPRE of the first data. Therefore, for the first terminal device, the normalized power P of the first DMRS is DMRS =2, the normalized power P of the first data PDSCH =1, so the first power scaling factor That is -3dB.

[0220] For the second type, please refer to Fig.12 , is a schematic diagram of DMRS and data resources provided in an embodiment of the present application. Fig.12 As shown, there are a first terminal device and a second terminal device, the first DMRS occupies a port of the first CDM group, and the DMRS of the second terminal device occupies a port of the second CDM group. Therefore, for the first terminal device, each RE where the first DMRS is located corresponds to one port, and each RE where the first data is located corresponds to one port. The normalized power P of the first DMRS is DMRS =1, PDSCH data normalized power P PDSCH =1, so the first power scaling factor That is 0dB.

[0221] The third type, please refer to Fig.13 , is a schematic diagram of DMRS and data resources provided in an embodiment of the present application. Fig.13 As shown, there are a first terminal device and a second terminal device, the first DMRS occupies one port of the first CDM group, and the DMRS of the second terminal device occupies one port of the first CDM group. Therefore, for the first terminal device, each RE where the first DMRS is located corresponds to 2 ports, and the RE where the first data is located corresponds to one port, so the normalized power P of the first DMRS is DMRS =1 / 2, PDSCH data normalized power P PDSCH =1, so the first power scaling factor That is 3dB.

[0222] If two ports are configured for data transmission of UE1, the first power scaling factor may have the following three possible values, which are introduced below respectively.

[0223] In the first case, the two ports of the first terminal device correspond to different CDM groups. Therefore, for the first terminal device, each RE where the first DMRS is located corresponds to one port, and each RE where the first data is located corresponds to two ports. The normalized power P of each port of the first DMRS is DMRS =1,1, the normalized power P of each port of the first data PDSCH =0.5,0.5, so the first scaling factor That is -3dB.

[0224] For the second type, please refer to Fig.14 , is a schematic diagram of DMRS and data resources provided in an embodiment of the present application. Fig.14 As shown in FIG. 1 , there are a first terminal device and a second terminal device. The first terminal device has two ports respectively occupied on different CDM groups, while the first terminal device has only one port. Therefore, the second terminal device and the first terminal device share the same CDM group. Therefore, for the first terminal device, half of each RE where the first DMRS is located corresponds to one port and the other half corresponds to two ports. Half of each RE where the first data is located corresponds to one port and the other half corresponds to two ports. Therefore, the normalized power P of the first DMRS is DMRS =1,0.5, normalized power of the first data So the first power scaling factor That is -3dB.

[0225] The third type is that there are a first terminal device and a second terminal device, each of which has two ports. For the first terminal device, each RE where the first DMRS is located corresponds to two ports, each RE where the first data is located corresponds to two ports, and the normalized power P of the first DMRS is DMRS =0.5,0.5, the normalized power P of the first data PDSCH =0.5,0.5, so the first power scaling factor That is 0dB.

[0226] C3, the value of the first parameter is 3, and the CDM group of the first DMRS that does not carry the first data includes the first CDM group, the second CDM group, and the third CDM group;

[0227] C3-1. When the first DMRS occupies only the first CDM group and the second CDM group and the third CDM group are not occupied, the first power scaling factor is one third of the ratio of the number of first ports to the number of second ports.

[0228] C3-2. When the first DMRS occupies only the first CDM group, the second CDM group is occupied, and the third CDM group is not occupied, the first power scaling factor is two-thirds of the ratio of the number of first ports to the number of second ports.

[0229] C3-3. When the first DMRS occupies only the first CDM group, and both the second CDM group and the third CDM group are occupied, the first power scaling factor is the ratio of the number of first ports to the number of second ports.

[0230] C3-4, when the first DMRS occupies the first CDM group and the second CDM group, and the third CDM group is not occupied, the first power scaling factor is two-thirds of the ratio of the first product to the first sum; or,

[0231] C3-5. When the first DMRS occupies only the first CDM group and the second CDM group, and the third CDM group is occupied, the first power scaling factor is the ratio of the first product to the first sum; or,

[0232] C3-6. When the first DMRS occupies the first CDM group, the second CDM group, and the third CDM group, the first power scaling factor is the sum of the second product, the third product, and the fourth product. The second product is the product of the first port number, the third port number, and the fourth port number, the third product is the product of the first port number and the third port number, the fourth product is the product of the third port number and the fourth port number, and the fourth port number is the number of ports occupied by the third CDM group.

[0233] By analogy, all possible situations of the first power scaling factor can be obtained. Optionally, correspondingly, the multiple power scaling factors may include some or all of the possible power scaling factors in C1-C3 above.

[0234] Please refer to Table 7 below, which is a possible power scaling factor under DMRS Type 1 provided in an embodiment of the present application.

[0235] Table 7

[0236]

[0237] Please refer to Table 8 below, which is a possible power scaling factor under DMRS Type 2 provided in an embodiment of the present application.

[0238] Table 8

[0239]

[0240]

[0241] Please refer to Table 9 below, which is a possible power scaling factor for DMRS eType 1 provided in an embodiment of the present application.

[0242] Table 9

[0243]

[0244]

[0245]

[0246] Please refer to Table 10 below, which is a possible power scaling factor for DMRS eType 2 provided in an embodiment of the present application.

[0247] Table 10

[0248]

[0249]

[0250]

[0251] Please refer to Table 11 below, which is a possible power scaling factor for DMRS eType2 provided in an embodiment of the present application.

[0252] Table 11

[0253]

[0254]

[0255]

[0256]

[0257]

[0258]

[0259] It should be understood that 1 port, 2 ports, etc. in Tables 7 to 11 above all refer to the number of ports configured for data transmission of UE1.

[0260] By analogy, the first network device may obtain possible values ​​of the first power scaling factor based on Tables 7 to 11, and the above-mentioned multiple power scaling factors may also belong to the power scaling factors shown in Tables 7 to 11.

[0261] In an embodiment of the present application, the first terminal device can directly determine the first power scaling factor based on the first index, which simplifies the process of determining the power scaling factor. In addition, the embodiment of the present application takes into account the value of the power scaling factor in the SU time-division scenario and other scenarios that share the same DMRS symbol, so that the method provided by the embodiment of the present application can be applied to more scenarios and has better universal adaptability. In addition, the embodiment of the present application also provides a specific method for determining the power scaling factor. For the SU time-division scenario that shares the same DMRS symbol, transmitting DMRS can solve the problem of non-standard transmission power that may cause normal communication in this case on the one hand, and on the other hand, when demodulating data, the network device or terminal device ensures the reliability of demodulation based on the DMRS power scaling factor and the estimated channel; for the SU time-division scenario that shares the same DMRS symbol, different SU users can share 1 DMRS symbol (occupying different ports), which can reduce the DMRS overhead on the basis of reducing the air interface transmission delay; further, under the same overhead, the data transmission performance can be effectively improved.

[0262] The embodiment of the present application also provides a communication method, in which the first network device can directly indicate the value of the first power scaling factor to the first terminal device, so that the first terminal device can directly determine the value of the first power scaling factor, simplifying the way of indicating the first power scaling factor. Fig.15 A schematic diagram of a communication method is shown to introduce the method. Fig.15 The two steps S1501 and S1502 are illustrated and are introduced below respectively.

[0263] S1501: The first network device sends fifth information to the first terminal device. Correspondingly, the first terminal device receives the fifth information from the first network device.

[0264] The fifth information may be carried in RRC signaling or DCI, for example, and the embodiment of the present application does not specifically limit this. For example, the fifth information carries a new parameter dmrs-scalingfactor in the DMRS-DownlinkConfig IE of the RRC signaling. The fifth information indicates the value of the first power scaling factor. The first power scaling factor includes -4.39 decibels (dB), -4.26dB, -4.19dB, -3.98dB, -3.83dB, -3.68dB, -3.52dB, -3.36dB, -3.27dB, -3.19dB, -2.83dB, -2.73dB, -2.63dB, -2.43dB, -2.22dB, -2.00dB, -1.96dB, -1. 76dB, -1.51dB, -1.38dB, -1.25dB, -0.97dB, -0.79dB, -0.67dB, -0.51dB, -0.35dB, -0.30dB, 0.38dB, 0.58dB, 0.79dB, 1.24dB, 1.25dB, 1.76dB, 2.34dB, 3.01dB, 4.26dB, 4.77dB or 6.02dB. Optionally, the first power scaling factor may also include 0dB, -3dB or -4.77dB.

[0265] Optionally, in the embodiment of the present application, the number of ports of the first terminal device for resources where data transmission is located, and the CDM group(s) that do not carry data may be fixed.

[0266] S1502. The first terminal device determines a first power scaling factor according to the fifth information.

[0267] Since the fifth information directly indicates the first power scaling factor, the first terminal device can directly obtain the first power scaling factor after parsing the fifth information.

[0268] Optionally, the first network device may also send a first PDSCH to the first terminal device, and the first terminal device may perform equalization and demodulation on the first data in the first PDSCH based on the first power scaling factor. The relevant contents of the first PDSCH and the first data may refer to the above text. Figure 6 The contents of the first PDSCH and the first data are discussed, and the repeated parts are not listed again.

[0269] In an embodiment of the present application, the first network device may directly indicate a power scaling factor to the first terminal device, thereby enabling accurate indication of the power scaling factor. In addition, since the first network device directly indicates the power scaling factor, the process of indicating the power scaling factor can be simplified to the greatest extent, and the process of the terminal device determining the first power scaling factor can be simplified. The solution provided in the embodiment of the present application may be applicable to situations where the antenna port configuration is relatively fixed during the scheduling process.

[0270] It is understandable that, in order to implement the functions in the above embodiments, the base station and the terminal include hardware structures and / or software modules corresponding to the execution of each function. It should be easily appreciated by those skilled in the art that, in combination with the units and method steps of each example described in the embodiments disclosed in this application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0271] The present application embodiment provides a communication device. Fig.16 , is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. These communication devices can be used to implement the functions of the first terminal device or the first network device in the above method embodiment, and thus can also achieve the beneficial effects of the above method embodiment. In the embodiment of the present application, the communication device can be as follows Figure 1 The first terminal device shown or Figure 2-Figure 5 Any UE1 involved may also be Figure 1 The first network device shown may also be a module (such as a chip) applied to the first terminal device or the first network device.

[0272] like Fig.16 As shown, the communication device 1600 includes a transceiver module 1610 and a processing module 1620. The communication device 1600 is used to implement the above Figure 6 or Fig.15 The function of the first terminal device or the first network device in.

[0273] In the first embodiment, the communication device 1600 is used to implement Figure 6 The functions of the first terminal device in the method embodiment are shown.

[0274] Exemplarily, the transceiver module 1610 may be used to receive the first information, and the processing module 1620 may be used to determine the first power scaling factor according to the first information. Optionally, the transceiver module 1610 may also be used to receive the second information, the third information, the fourth information and the PDSCH, and the processing module 1620 may also be used to demodulate the first PDSCH based on the first power scaling factor.

[0275] In the second embodiment, the communication device 1600 is used to implement Figure 6 The functions of the first network device in the method embodiment are shown.

[0276] Exemplarily, the transceiver module 1610 may send the first information under the control of the processing module 1620. Optionally, the transceiver module 1610 may also be used to send the second information, the third information, the fourth information, the PDSCH, and the like.

[0277] The specific contents of the relevant steps performed by the transceiver module 1610 and the processing module 1620 can be referred to in the previous text. Figure 6 The contents of the method embodiment shown are not listed here again.

[0278] In the third embodiment, the communication device 1600 is used to implement Fig.15 The functions of the first terminal device in the method embodiment are shown.

[0279] Exemplarily, the transceiver module 1610 may be used to receive fifth information, and the processing module 1620 may be used to determine the first power scaling factor according to the fifth information.

[0280] In the fourth embodiment, the communication device 1600 is used to implement Fig.15 The functions of the first network device in the method embodiment are shown.

[0281] Exemplarily, the transceiver module 1610 sends the fifth information under the control of the processing module 1620 .

[0282] The specific contents of the relevant steps performed by the transceiver module 1610 and the processing module 1620 can be referred to in the previous text. Fig.15 The contents of the method embodiment shown are not listed here again.

[0283] An embodiment of the present application also provides a communication device. Fig.17 The figure shows a schematic diagram of the structure of a communication device. Fig.17The communication device 1700 includes a processor 1710 and an interface circuit 1720. The processor 1710 and the interface circuit 1720 are coupled to each other. It is understood that the interface circuit 1720 can be a transceiver or an input-output interface. Optionally, the communication device 1700 may also include a memory for storing instructions executed by the processor 1710 or storing input data required by the processor 1710 to execute instructions or storing data generated after the processor 1710 executes instructions.

[0284] When the communication device 1700 is used to implement Fig.16 When the method is shown, the processor 1710 is used to implement the functions of the above-mentioned processing module 1620, and the interface circuit 1720 is used to implement the functions of the above-mentioned transceiver module 1610.

[0285] When the above communication device is a chip applied to a terminal device, the chip implements the functions of the terminal device (such as the first terminal device) in the above method embodiment. The chip receives information from other modules in the terminal device (such as a radio frequency module or an antenna), and the information is sent by the network device to the terminal device; or the chip sends information to other modules in the terminal device (such as a radio frequency module or an antenna), and the information is sent by the terminal device to the network device.

[0286] When the above-mentioned communication device is a module applied to a network device, the module implements the functions of the network device in the above-mentioned method embodiment. The module receives information from other modules in the network device (such as a radio frequency module or an antenna), and the information is sent by the terminal device to the network device; or, the module sends information to other modules in the network device (such as a radio frequency module or an antenna), and the information is sent by the network device to the terminal device. The module here can be a baseband chip of the network device, or it can be a DU or other module. The DU here can be a DU under an open radio access network (O-RAN) architecture, etc., and the embodiments of the present application do not specifically limit this.

[0287] The present application embodiment provides another example of a communication device, the communication device includes at least one processor and at least one memory, the at least one processor and the at least one memory are coupled, the at least one memory is used to store instructions, when the instructions are executed by the at least one processor, the communication device executes the method in the above embodiment. Take the communication device including a processor and a memory as an example, Fig.18 As shown, the communication device 1800 includes a processor 1810 and a memory 1820. The processor 1810 and the memory 1820 are coupled, and the memory 1820 stores instructions. When the instructions stored in the memory 1820 are executed by the processor 1810, the communication device 1800 executes the method executed by the network device in the above embodiment.

[0288] It is understood that the processor involved in each embodiment of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor. Also, the memory involved in each embodiment of the present application may include a volatile memory (volatile memory), such as a random access memory (RAM). The memory may also include a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory, a hard disk drive (HDD) or a solid state drive (SSD).

[0289] The method steps in each embodiment of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, register, hard disk, mobile hard disk, CD-ROM or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a base station or a terminal. The processor and the storage medium can also be present in a base station or a terminal as discrete components.

[0290] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed on a computer, the process or function described in the embodiment of the present application is executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device or other programmable device. The computer program or instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instruction may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server, data center, etc. that integrates one or more available media. The available medium may be a magnetic medium, for example, a floppy disk, a hard disk, a tape; it may also be an optical medium, for example, a digital video disc; it may also be a semiconductor medium, for example, a solid-state hard disk. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0291] The present application provides a chip system, which includes: a processor and an interface. The processor is used to call and run instructions from the interface. When the processor executes the instructions, any of the above communication methods is implemented, such as Figure 6 or Fig.15 The communication method described in any one of the above.

[0292] The embodiment of the present application provides a computer-readable storage medium, which is used to store a computer program or instruction. When the computer-readable storage medium is executed, any of the above communication methods is implemented, for example, Figure 6 or Fig.15 The communication method described in any one of the above.

[0293] The present application embodiment provides a computer program product including instructions, which, when executed on a computer, implements any of the above communication methods, for example, Figure 6 or Fig.15 The communication method described in any one of the above.

[0294] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0295] It is understood that the various numerical numbers involved in the various embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.

Claims

1. A communication method, characterized in that: include: Receive first information from a first network device, where the first information is used to indicate a first index of a first power scaling factor, where the first index is associated with the first power scaling factor, where the first power scaling factor is a ratio of a first power to a second power, where the first power is a transmission power of first data, and where the second power is a transmission power of a first demodulation reference signal DMRS.

2. The method according to claim 1, characterized in that: The method further comprises: Determine the first power scaling factor associated with the first index from second information, wherein the second information includes multiple indices and multiple power scaling factors, each of the multiple indexes is associated with a power scaling factor in the multiple power scaling factors, and the multiple indexes include the first index.

3. The method according to claim 2, characterized in that The plurality of power scaling factors include -4.39 dB, -4.26 dB, -4.19 dB, -3.98 dB, -3.83 dB, -3.68 dB, -3.52 dB, -3.36 dB, -3.27 dB, -3.19 dB, -2.83 dB, -2.73 dB, -2.63 dB, -2.43 dB, -2.22 dB, -2.00 dB, -1.96 dB, -1.76 dB. At least one of B, -1.51dB, -1.38dB, -1.25dB, -0.97dB, -0.79dB, -0.67dB, -0.51dB, -0.35dB, -0.30dB, 0.38dB, 0.58dB, 0.79dB, 1.24dB, 1.25dB, 1.76dB, 2.34dB, 3.01dB, 4.26dB, 4.77dB, and 6.02dB.

4. The method according to claim 3, characterized in that The multiple power scaling factors also include 0dB, -3dB and -4.77dB.

5. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: Third information is received from the first network device, where the third information is used to indicate a configuration type of the first DMRS, and the first power scaling factor is also associated with the configuration type of the first DMRS.

6. The method according to claim 5, characterized in that When the configuration type of the first DMRS is the first configuration type, the first index is carried in K bits of the first information; When the configuration type of the first DMRS is the second configuration type, the first index is carried in L bits of the first information; The first configuration type is different from the second configuration type, L and K are both positive integers, and the value of L is greater than the value of K.

7. The method according to any one of claims 2 to 4, characterized in that: The multiple power scaling factors are divided into a first type of power scaling factors and a second type of power scaling factors, wherein the first type of power scaling factors includes the multiple power scaling factors, and the second type of power scaling factors includes 0 dB, -3 dB and -4.77 dB; In the case where the first power scaling factor belongs to the first category of power scaling factors, the first index is carried in a first field of the first information; or, In the case where the first power scaling factor belongs to the second category of power scaling factors, the first index is carried in a second field of the first information; The first field is different from the second field.

8. The method according to claim 7, characterized in that The first type of power scaling factors include: a power scaling factor in a first case, wherein the first DMRS and the DMRS of the second terminal device occupy the same time domain resources, and the first data and the data of the second terminal device occupy different time domain resources; and / or, The power scaling factor in the second case, the second case is that the first DMRS and the DMRS of at least two second terminal devices occupy the same time domain resources, the first data and the data of a part of the second terminal devices among the at least two second terminal devices occupy the same time domain resources, and the first data and the data of another part of the second terminal devices among the at least two second terminal devices occupy different time domain resources.

9. The method according to claim 7 or 8, characterized in that: The second type of power scaling factors include: A power scaling factor in a third case, wherein the first DMRS and the DMRS of the second terminal device occupy different time domain resources, and the first data and the data of the second terminal device occupy different time domain resources; and / or, The power scaling factor in the fourth case is that the first DMRS and the DMRS of the second terminal device occupy the same time domain resources, and the first data and the data of the second terminal device occupy the same time domain resources.

10. The method according to any one of claims 2 to 4, characterized in that: The second information is preconfigured or predefined in the first terminal device; or, The second information is received from the first network device.

11. The method according to any one of claims 1 to 10, characterized in that: The method further comprises: Receive fourth information from the first network device, where the fourth information is used to indicate a first parameter, wherein the first power scaling factor is also associated with the first parameter, and the first parameter is the number of CDM groups of a first DMRS that does not carry the first data.

12. The method according to claim 11, characterized in that The value of the first parameter is 1, and the CDM group of the first DMRS that does not carry the first data includes the first CDM group; In the case where the first DMRS only occupies the first CDM group, the first power scaling factor is the ratio of the first port number to the second port number, wherein the first port number is the number of occupied ports in the first CDM group, and the second port number is the number of ports occupied by the first data.

13. The method according to claim 11, characterized in that The value of the first parameter is 2, and the CDM group of the first DMRS that does not carry the first data includes a first CDM group and a second CDM group; When the first DMRS occupies only the first CDM group and the second CDM group is not occupied, the first power scaling factor is half of the ratio of the number of first ports to the number of second ports; or, When the first DMRS occupies only the first CDM group and the second CDM group is occupied, the first power scaling factor is a ratio of the number of first ports to the number of second ports; or, In the case where the first DMRS occupies only the first CDM group and the second CDM group, the first power scaling factor is a ratio of the first product to the first sum; Among them, the first port number is the number of occupied ports in the first CDM group, the second port number is the number of ports occupied by the first data, the first product is the product of the first port number and the third port number, the first sum is the sum of the first port number and the third port number, and the third port number is the number of occupied ports in the second CDM group.

14. The method according to claim 11, characterized in that The value of the first parameter is 3, and the CDM group of the first DMRS that does not carry the first data includes a first CDM group, a second CDM group, and a third CDM group; When the first DMRS occupies only the first CDM group, and the second CDM group and the third CDM group are not occupied, the first power scaling factor is one third of the ratio of the number of first ports to the number of second ports; or, When the first DMRS occupies only the first CDM group, the second CDM group is occupied, and the third CDM group is not occupied, the first power scaling factor is two-thirds of the ratio of the number of first ports to the number of second ports; or, When the first DMRS occupies only the first CDM group, and the second CDM group and the third CDM group are both occupied, the first power scaling factor is a ratio of the number of first ports to the number of second ports; or, When the first DMRS occupies the first CDM group and the second CDM group, and the third CDM group is not occupied, the first power scaling factor is two-thirds of the ratio of the first product to the first sum; or, In a case where the first DMRS occupies only the first CDM group and the second CDM group, and the third CDM group is occupied, the first power scaling factor is a ratio of the first product to the first sum; or, In a case where the first DMRS occupies the first CDM group, the second CDM group and the third CDM group, the first power scaling factor is a sum of the second product, the third product and the fourth product; Among them, the first port number is the number of occupied ports in the first CDM group, the second port number is the number of ports occupied by the first data, the first product is the product of the first port number and the third port number, the first sum is the sum of the first port number and the third port number, the second product is the product of the first port number, the third port number and the fourth port number, the third product is the product of the first port number and the third port number, the fourth product is the product of the third port number and the fourth port number, the third port number is the number of occupied ports in the second CDM group, and the fourth port number is the number of occupied ports of the third CDM group.

15. A communication method, characterized in that: include: First information is sent to a first terminal device, where the first information is used to indicate a first index of a first power scaling factor, the first index is associated with the first power scaling factor, the first power scaling factor is a ratio of a first power to a second power, the first power is the transmission power of the first data, and the second power is the transmission power of a first demodulation reference signal DMRS.

16. The method according to claim 15, characterized in that The first power scaling factor is a power scaling factor associated with the first index in second information, wherein the second information includes multiple indexes and multiple power scaling factors, each of the multiple indexes is associated with a power scaling factor in the multiple power scaling factors, and the multiple indexes include the first index.

17. The method according to claim 16, characterized in that The plurality of power scaling factors include -4.39 dB, -4.26 dB, -4.19 dB, -3.98 dB, -3.83 dB, -3.68 dB, -3.52 dB, -3.36 dB, -3.27 dB, -3.19 dB, -2.83 dB, -2.73 dB, -2.63 dB, -2.43 dB, -2.22 dB, -2.00 dB, -1.96 dB, -1.76 dB. At least one of B, -1.51dB, -1.38dB, -1.25dB, -0.97dB, -0.79dB, -0.67dB, -0.51dB, -0.35dB, -0.30dB, 0.38dB, 0.58dB, 0.79dB, 1.24dB, 1.25dB, 1.76dB, 2.34dB, 3.01dB, 4.26dB, 4.77dB, and 6.02dB.

18. The method according to claim 17, characterized in that The multiple power scaling factors also include 0dB, -3dB and -4.77dB.

19. The method according to any one of claims 15 to 18, characterized in that: The method further comprises: Third information is sent to the first terminal device, where the third information is used to indicate a configuration type of the first DMRS, and the first power scaling factor is also associated with the configuration type of the first DMRS.

20. The method according to claim 19, characterized in that When the configuration type of the first DMRS is the first configuration type, the first index is carried in K bits of the first information; When the configuration type of the first DMRS is the second configuration type, the first index is carried in L bits of the first information; The first configuration type is different from the second configuration type, and the value of L is greater than the value of K.

21. The method according to any one of claims 16 to 18, characterized in that: The multiple power scaling factors are divided into a first type of power scaling factors and a second type of power scaling factors, wherein the first type of power scaling factors includes the multiple power scaling factors, and the second type of power scaling factors includes 0 dB, -3 dB and -4.77 dB; In the case where the first power scaling factor belongs to the first category of power scaling factors, the first index is carried in a first field of the first information; or, In the case where the first power scaling factor belongs to the second category of power scaling factors, the first index is carried in a second field of the first information; The first field is different from the second field.

22. The method according to claim 21, characterized in that The first type of power scaling factors include: a power scaling factor in a first case, wherein the first DMRS and the DMRS of the second terminal device occupy the same time domain resources, and the first data and the data of the second terminal device occupy different time domain resources; and / or, The power scaling factor in the second case, the second case is that the first DMRS and the DMRS of at least two second terminal devices occupy the same time domain resources, the first data and the data of a part of the second terminal devices among the at least two second terminal devices occupy the same time domain resources, and the first data and the data of another part of the second terminal devices among the at least two second terminal devices occupy different time domain resources.

23. The method according to claim 21 or 22, characterized in that The second type of power scaling factors include: A power scaling factor in a third case, wherein the first DMRS and the DMRS of the second terminal device occupy different time domain resources, and the first data and the data of the second terminal device occupy different time domain resources; and / or, The power scaling factor in the fourth case is that the first DMRS and the DMRS of the second terminal device occupy the same time domain resources, and the first data and the data of the second terminal device occupy the same time domain resources.

24. The method according to any one of claims 16 to 18, characterized in that: The method further comprises: The second information is sent to the first terminal device.

25. The method according to any one of claims 15 to 24, characterized in that: The method further comprises: Fourth information is sent to the first terminal device, where the fourth information is used to indicate a first parameter, wherein the first power scaling factor is also associated with the first parameter, and the first parameter is the number of CDM groups of the first DMRS that does not carry the first data.

26. The method according to claim 25, characterized in that The value of the first parameter is 1, and the CDM group of the first DMRS that does not carry the first data includes the first CDM group; In the case where the first DMRS only occupies the first CDM group, the first power scaling factor is the ratio of the first port number to the second port number, wherein the first port number is the number of occupied ports in the first CDM group, and the second port number is the number of ports occupied by the first data.

27. The method according to claim 25, characterized in that The value of the first parameter is 2, and the CDM group of the first DMRS that does not carry the first data includes a first CDM group and a second CDM group; When the first DMRS occupies only the first CDM group and the second CDM group is not occupied, the first power scaling factor is half of the ratio of the number of first ports to the number of second ports; or, When the first DMRS occupies only the first CDM group and the second CDM group is occupied, the first power scaling factor is a ratio of the number of first ports to the number of second ports; or, In the case where the first DMRS occupies only the first CDM group and the second CDM group, the first power scaling factor is a ratio of the first product to the first sum; Among them, the first port number is the number of occupied ports in the first CDM group, the second port number is the number of ports occupied by the first data, the first product is the product of the first port number and the third port number, the first sum is the sum of the first port number and the third port number, and the third port number is the number of occupied ports in the second CDM group.

28. The method according to claim 25, characterized in that The value of the first parameter is 3, and the CDM group of the first DMRS that does not carry the first data includes a first CDM group, a second CDM group, and a third CDM group; When the first DMRS occupies only the first CDM group, and the second CDM group and the third CDM group are not occupied, the first power scaling factor is one third of the ratio of the number of first ports to the number of second ports; or, When the first DMRS occupies only the first CDM group, the second CDM group is occupied, and the third CDM group is not occupied, the first power scaling factor is two-thirds of the ratio of the number of first ports to the number of second ports; or, When the first DMRS occupies only the first CDM group, and the second CDM group and the third CDM group are both occupied, the first power scaling factor is a ratio of the number of first ports to the number of second ports; or, When the first DMRS occupies the first CDM group and the second CDM group, and the third CDM group is not occupied, the first power scaling factor is two-thirds of the ratio of the first product to the first sum; or, In a case where the first DMRS occupies only the first CDM group and the second CDM group, and the third CDM group is occupied, the first power scaling factor is a ratio of the first product to the first sum; or, In a case where the first DMRS occupies the first CDM group, the second CDM group and the third CDM group, the first power scaling factor is a sum of the second product, the third product and the fourth product; Among them, the first port number is the number of occupied ports in the first CDM group, the second port number is the number of ports occupied by the first data, the first product is the product of the first port number and the third port number, the first sum is the sum of the first port number and the third port number, the second product is the product of the first port number, the third port number and the fourth port number, the third product is the product of the first port number and the third port number, the fourth product is the product of the third port number and the fourth port number, the third port number is the number of occupied ports in the second CDM group, and the fourth port number is the number of occupied ports of the third CDM group.

29. A communication device, characterized in that: The method comprises a module for executing the method according to any one of claims 1 to 14, or a module for executing the method according to any one of claims 15 to 28.

30. A communication device, characterized in that: It includes a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices outside the communication device and transmit them to the processor or send signals from the processor to other communication devices outside the communication device, and the processor is used to implement the method according to any one of claims 1 to 14 through a logic circuit or execute code instructions, or to implement the method according to any one of claims 15 to 28.

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