RU2801978C1 - Method for determining transmission mode and device - Google Patents

Abstract

FIELD: communications.

SUBSTANCE: method includes obtaining, by the terminal device, configuration indicator information, where the configuration indicator information contains one or more of DMRS indicator information, retransmission indicator information, or transmission configuration indicator information, determining a transmission mode based on the configuration indicator information, where the transmission mode is one or more of: a space division multiplexing mode, a frequency division multiplexing mode, or a time division multiplexing mode.

EFFECT: providing the ability to identify the transmission mode by the terminal to distinguish between multiple transmission modes in enhanced mobile broadband (eMBB) scenarios and ultra-reliable and low-latency communication (uRLLC) scenarios.

33 cl, 14 dwg, 10 tbl

Description

The technical field to which the invention belongs

Embodiments of the present application relate generally to the field of communication technologies and, in particular, to a transmission mode determination method and device.

State of the art

With the development of communication technologies, communication systems of the fifth generation (5 ^th -generation) appear (which are referred to as "new radio" (new radio, NR)). The 5G system includes three application scenarios: enhanced mobile broadband (eMBB), ultra-realiable and low-latency communication (uRLLC), and massive machine type communications (mMTC). ).

The uRLLC scenario currently uses retransmission to improve transmission reliability. The retransmission may be one or more retransmissions in the spatial domain, retransmission in the frequency domain, or retransmission in the time domain. Retransmission in the spatial domain is a multiplexing in the spatial domain (spatial domain multiplexing, SDM) and corresponds to one transmission mode. Frequency domain retransmission is frequency domain multiplexing (FDM) and corresponds to two transmission modes. Time domain retransmission is time domain multiplexing (TDM) and corresponds to two transmission modes. For the plurality of transmission modes in the eMBB scenario and the uRLLC scenario, how the terminal identifies the transmission mode used on the network side is a technical issue that needs to be addressed urgently.

Disclosure of the essence of the invention

Embodiments of the present application provide a method for determining the transmission mode and an apparatus for identifying the transmission mode used on the network side, so that the terminal side performs reception and processing based on the transmission mode.

The first aspect of embodiments of the present application provides a method for determining a transmission mode. The method includes:

obtaining configuration indicator information, the configuration indicator information being one or more of demodulation reference signal (DMRS) indicator information, retransmission indicator information, or transmission configuration indicator information; And

determining a transmission mode based on the configuration indicator information, where the transmission mode is one or more of: a space division multiplexing mode, a frequency division multiplexing mode, or a time division multiplexing mode.

The method provided in the first aspect of the embodiments of the present application may be performed by a terminal device, or may be performed by a component (eg, a processor, chip, or chip system) of the terminal device. The terminal device identifies, based on the configuration indicator information, the transmission mode used by the network device, and then can perform appropriate reception processing based on the transmission mode.

The DMRS indicator information may be used to indicate one or more DMRS port IDs, or may be used to indicate one or more DMRS port IDs and the number of code division multiplexing (CDM) groups without data.

In embodiments of the present application, DMRS indicator information can also be described as antenna port indicator information. The relationship between the DMRS Port Index and the Antenna Port Index is as follows: DMRS Port Index+1000=Antenna Port Index.

The retransmission pointer information is used to indicate a time domain retransmission parameter, or is used to indicate a first time domain retransmission parameter and a second time domain retransmission parameter, or is used to indicate a time domain retransmission parameter and a frequency domain retransmission parameter. or is used to indicate a frequency domain retransmission parameter, a first time domain retransmission parameter, and a second time domain retransmission parameter.

The transmission configuration indication (TCI) information is used to indicate the state of the TCI during transmission. The TCI information may be a TCI codepoint. In the case of multicast transmission, one TCI code point may indicate two or more TCI states. In an exemplary implementation, the configuration indicator information is retransmission indicator information, and the retransmission indicator information is used to indicate a time domain retransmission parameter. When the terminal device has received the configuration indicator information, that is, received the time domain retransmission parameter, the terminal device determines, based on the time domain retransmission parameter, that the transmission mode is a time division multiplexing mode. Thus, it is identified, using the obtained time domain retransmission parameter, that the transmission mode is a time division multiplexing mode. Conversely, when the terminal device has not received information indicating the configuration, that is, has not received the time domain retransmission parameter, the terminal device determines that the transmission mode cannot be a time division multiplexing mode, in other words, the transmission mode can be any of: a frequency division multiplexing mode, a space division multiplexing mode, or a combined mode from a frequency division multiplexing mode and a space division multiplexing mode.

In an exemplary implementation, after the transmission mode is identified as a time division multiplexing mode using the time domain retransmission parameter, it may be further identified whether the time division multiplexing mode is a first time division multiplexing mode or a second multiplexing mode with time division channels. The first time division multiplexing mode is a time division multiplexing mode in a slot block, and the second time division multiplexing mode is a time division multiplexing mode between slot blocks.

If the time domain retransmission parameter is the first time domain retransmission parameter, it can be determined that the time division multiplexing mode is the first time division multiplexing mode; or, if the time domain retransmission parameter is the second time domain retransmission parameter, it can be determined that the time division multiplexing mode is the second time division multiplexing mode.

If the time domain retransmission parameter includes a specific parameter of the first time division multiplexing mode, it can be determined that the time division multiplexing mode is the first time division multiplexing mode. For example, if the time domain retransmission parameter includes offset information, it can be determined that the time division multiplexing mode is the first time division multiplexing mode; or, if the time domain retransmission parameter does not include offset information, it can be determined that the time division multiplexing mode is the second time division multiplexing mode. The offset information may represent offset information about positions in the time domain of a plurality of physical downlink shared channels (PDSCHs).

In an exemplary implementation, the configuration indicator information is retransmission indicator information, and the retransmission indicator information is used to indicate a first time domain retransmission parameter and a second time domain retransmission parameter. When the terminal device has received the configuration indicator information, that is, obtained the first time domain retransmission parameter and the second time domain retransmission parameter, the terminal device determines based on the values of the first time domain retransmission parameter and the second time domain retransmission parameter, regardless on whether the transmission mode is a time division multiplexing mode. When the terminal device has not received the configuration information, that is, has not received the first time domain retransmission parameter and the second time domain retransmission parameter, the terminal device determines that the transmission mode is a frequency division multiplexing mode, a space division multiplexing mode or a combined mode from a frequency division multiplexing mode and a space division multiplexing mode.

Determining, based on the values of the first time domain retransmission parameter and the second time domain retransmission parameter, whether the transmission mode is a time division multiplexing mode may include: if the values of both the first time domain retransmission parameter, and the second time domain retransmission parameter is equal to the first predetermined value, and the second time domain retransmission parameter is equal to the first predetermined value, determining whether the transmission mode is a frequency division multiplexing mode, a space division multiplexing mode, or a combined mode from a frequency division multiplexing mode and a space division multiplexing mode; or, if one or both of the values of the first time domain retransmission parameter and the second time domain retransmission parameter are greater than the first predetermined value, determining that the transmission mode is a time division multiplexing mode. The first set value can be 1.

In an exemplary implementation, after the transmission mode is identified as a time division multiplexing mode using the first time domain retransmission parameter and the second time domain retransmission parameter, it may be further identified whether the transmission mode is the first time division multiplexing mode channels or a second time division multiplexing mode. The first time division multiplexing mode is a time division multiplexing mode in a slot block, and the second time division multiplexing mode is a time division multiplexing mode between slot blocks.

If the value of the first time domain retransmission parameter is equal to the first predetermined value, and the value of the second time domain retransmission parameter is greater than the first predetermined value, it is determined that the time division multiplexing mode is the second time division multiplexing mode; or, if the value of the second time domain retransmission parameter is equal to the first predetermined value, and the value of the first time domain retransmission parameter is greater than the first predetermined value, it is determined that the time division multiplexing mode is the first time division multiplexing mode; or, if the values of both the first time domain retransmission parameter and the second time domain retransmission parameter are greater than the first predetermined value, it is determined that the time division multiplexing mode is the combined mode from the first time division multiplexing mode and the second time division multiplexing mode.

When the time division multiplexing mode is identified, the space division multiplexing mode and the frequency division multiplexing mode can be identified based on the fact that the configuration indicator information is DMRS indicator information.

In an exemplary implementation, one or more DMRS port IDs are determined based on DMRS indicator information, and a transmission mode is determined based on one or more DMRS port IDs.

Method 1: If the number of CDM groups corresponding to one or more DMRS port IDs is equal to the second predetermined value, it is determined that the transmission mode is a frequency division multiplexing mode; or, if the number of CDM groups corresponding to one or more DMRS port IDs is equal to the third predetermined value, it is determined that the transmission mode is a space division multiplexing mode. The second set value may be 1, which corresponds to one CDM group.

Method 2: If one or more DMRS port IDs belong to the same CDM group, it is determined that the transmission mode is a frequency division multiplexing mode; or, if one or more DMRS port IDs do not belong to the same CDM group, it is determined that the transmission mode is a space division multiplexing mode.

Method 3: If the number of one or more DMRS port IDs is equal to the second predetermined value, it is determined that the transmission mode is a frequency division multiplexing mode; or, if the number of one or more DMRS port IDs is not equal to the second predetermined value, it is determined that the transmission mode is a space division multiplexing mode. The second set value may be 1, which corresponds to one CDM group. The third predetermined value may be 2, which corresponds to two CDM groups.

Method 4: If one or more DMRS port IDs are predetermined IDs, it is determined that the transmission mode is a frequency division multiplexing mode; or, if one or more DMRS port IDs are not predetermined IDs, it is determined that the transmission mode is a space division multiplexing mode. The given identifier can take the values [0], [1] or [0, 1].

The above four methods for determining the transmission mode based on one or more DMRS port IDs are used as examples and do not limit the embodiments of the present application.

In an exemplary implementation, the number of CDM groups is determined based on the DMRS indicator information, and the transmission mode is determined based on the number of CDM groups. If the number of CDM groups is equal to the second predetermined value, it is determined that the transmission mode is a frequency division multiplexing mode; or, if the number of CDM groups is equal to the third predetermined value, it is determined that the transmission mode is a space division multiplexing mode.

In an exemplary implementation, once the transmission mode is determined to be a frequency division multiplexing mode, it may be further identified whether the frequency division multiplexing mode is a first frequency division multiplexing mode or a second frequency division multiplexing mode. The first frequency division multiplexing mode is a frequency division multiplexing mode based on one codeword, and the second frequency division multiplexing mode is a frequency division multiplexing mode based on multiple codewords.

If a frequency domain retransmission parameter has been received, it is determined that the frequency division multiplexing mode is the second frequency division multiplexing mode; or, if the frequency domain retransmission parameter has not been received, it is determined that the frequency division multiplexing mode is the first frequency division multiplexing mode.

In an exemplary implementation, the configuration indicator information is retransmission indicator information, and the retransmission indicator information is used to indicate a time domain retransmission parameter. Based on the time domain retransmission parameter, it is determined that the transmission mode is a second time division multiplexing mode, where the second time division multiplexing mode is a time division multiplexing mode between slot blocks.

In an exemplary implementation, after the transmission mode is identified as the second time division multiplexing mode, the few remaining transmission modes may be identified based on the fact that the configuration indicator information is DMRS indicator information. The DMRS port information is determined based on the DMRS indicator information, and the remaining few transmission modes are determined based on the DMRS port information.

In an exemplary implementation, the DMRS port information includes one or more DMRS port IDs and the number of no data CDM groups, and is determined, based on the number of CDM groups corresponding to one or more DMRS port IDs and the number of no data CDM groups, that the mode transmission is a space division multiplexing mode, a frequency division multiplexing mode, or a first time division multiplexing mode. If it is determined that the transmission mode is a frequency division multiplexing mode, then it is determined, based on the CDM group group ID corresponding to one or more DMRS port IDs, that the transmission mode is the first frequency division multiplexing mode or the second frequency division multiplexing mode. frequency division of channels. The first time division multiplexing mode is a time division multiplexing mode in a slot block, the first frequency division multiplexing mode is a frequency division multiplexing mode based on one codeword, and the second frequency division multiplexing mode is a frequency division multiplexing mode with frequency division of channels based on multiple code words.

For example, if the number of CDM groups corresponding to one or more DMRS port IDs is equal to the third predetermined value, it is determined that the transmission mode is a space division multiplexing mode; if the number of CDM groups corresponding to one or more DMRS port IDs is equal to the second predetermined value, and the number of DMRS groups without data is equal to the second predetermined value, it is determined that the transmission mode is the first time division multiplexing mode, where the first time division multiplexing mode channel division is a time division multiplexing mode in a slot unit; or, if the number of CDM groups corresponding to one or more DMRS port IDs is equal to the second predetermined value, and the number of CDM groups is equal to the third predetermined value, it is determined that the transmission mode is a frequency division multiplexing mode. After it is determined that the transmission mode is a frequency division multiplexing mode, if the CDM group group identifier corresponding to one or more DMRS port IDs is the first identifier, it is determined that the transmission mode is the first frequency division multiplexing mode; or, if the CDM group group ID corresponding to one or more DMRS port IDs is the second ID, then it is determined that the transmission mode is the second frequency division multiplexing mode.

In an exemplary implementation, the configuration indicator information is DMRS indicator information and retransmission indicator information, and the retransmission indicator information is used to indicate a frequency domain retransmission parameter, a first time domain retransmission parameter, and a second time domain retransmission parameter. The retransmission indicator information may be represented as {a, b, c}. For example, a is a frequency domain retransmission parameter, b is a first time domain retransmission parameter, and c is a second time domain retransmission parameter.

The number of CDM groups is determined based on the DMRS indicator information, and the transmission mode is determined based on the number of CDM groups, the frequency domain retransmission parameter, the first time domain retransmission parameter, and the second time domain retransmission parameter. For example, if it is determined based on the DMRS indicator information that the number of CDM groups is two and the retransmission indicator information is {1, 1, 1}, it can be determined that the transmission mode is a space division multiplexing mode.

In an exemplary implementation, the configuration indicator information is DMRS indicator information, and the DMRS indicator information is used to indicate one or more of: DMRS port IDs, CDM group group ID, number of CDM groups, CDM group group ID with no data, or number of CDM groups with no data.

Determining the transmission mode based on the configuration indicator information includes: determining, based on the DMRS indicator information, that the transmission mode is one or more of: a space division multiplexing mode, a first frequency division multiplexing mode, a second frequency division multiplexing mode frequency division, a first time division multiplexing mode, or a second time division multiplexing mode.

The DMRS pointer information is used to indicate one or more DMRS port IDs, and different DMRS port IDs correspond to different transmission modes or correspond to different submodes of the same transmission mode.

The DMRS indicator information is used to indicate one or more DMRS port IDs, one or more DMRS port IDs belong to different CDM groups, and different CDM group IDs correspond to different transmission modes or correspond to different submodes of the same transmission mode.

The DMRS indicator information is used to indicate one or more DMRS port IDs, one or more DMRS port IDs belong to different CDM groups, and different numbers of CDM groups correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

The DMRS indicator information is used to indicate the CDM group group ID or the number of CDM groups; And

different CDM group IDs correspond to different transmission modes or correspond to different sub-modes of the same transmission mode; or

different number of CDM groups correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

The DMRS pointer information is used to indicate the CDM group group ID without data or the number of CDM groups without data; And

different number of CDM groups without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode; or

different CDM group IDs without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

The DMRS indicator information is used to indicate one or more DMRS port IDs and a blank CDM group ID or blank CDM group number; And

different combinations of the CDM group ID and the number of CDM groups without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode; or

different combinations of CDM group ID and CDM group ID without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

The DMRS indicator information is used to indicate the number of CDM groups and the group ID of the CDM group without data or the number of CDM groups without data; And

different combinations of the number of CDM groups and the number of CDM groups without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode; or

different combinations of the CDM group group ID and the number of CDMs without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

The DMRS indicator information is used to indicate the CDM group group ID and the CDM group group ID without data or the number of CDM groups without data; And

different combinations of CDM Group ID and CDM Group ID without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode; or

different combinations of the CDM group group ID and the number of CDMs without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

The DMRS pointer information includes a used value and a set value, and the used value is used to indicate one or more of: DMRS port IDs, a CDM group group ID, a CDM group number, a blank CDM group ID, or a blank CDM group ID; And

different values used correspond to different transmission modes or correspond to different sub-modes of the same transmission mode; or

different set values correspond to different transmission modes or correspond to different sub-modes of the same transmission mode; or

different combinations of the used value and the set value correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

In an exemplary implementation, the configuration indicator information is TCI information, and the TCI information is used to indicate the state of the TCI. If the number of TCI states is equal to the fourth predetermined value, it can be determined that the transmission mode is a frequency division multiplexing mode or a space division multiplexing mode; or, if the number of TCI states is greater than the fourth predetermined value, it can be determined that the transmission mode is a time division multiplexing mode. The fourth set value may be 2, which corresponds to two TCI states.

In an exemplary implementation, the configuration indicator information is TCI information and retransmission indicator information. The TCI information is used to indicate the state of the TCI. The retransmission pointer information is used to indicate a retransmission parameter in the time domain. Based on the number of TCI states and the time domain retransmission parameter, it is determined that the transmission mode is a time division multiplexing mode.

The second aspect of the embodiments of the present application provides a method for determining the transmission mode. The method includes:

if the configuration information has been received, obtaining transmission mode indicator information, where the transmission mode indicator information is used to indicate the transmission mode; And

determining a transmission mode based on the information of the transmission mode indicator.

The method provided in the second aspect of the embodiments of the present application may be performed by a terminal device, or may be performed by a component (eg, processor, chip, or system on a chip) of the terminal device. Dynamic switching between a specific uRLLC multi-station scenario and an eMBB multi-station scenario can be implemented using configuration information and transmission mode indicator information, and no additional indication overhead is required.

The configuration information may be considered as configuration information indicating a uRLLC scenario to distinguish between a multi-station uRLLC scenario and a multi-station eMBB scenario.

In an exemplary implementation, the configuration information may be used to indicate an exclusive feature of a multi-station uRLLC scenario, for example, to indicate that the terminal device may use a bit rate below a given bit rate, or to indicate that the terminal device uses a given modulation and coding scheme table. . The predetermined bit rate may be 120*1024 (Kbps), the predetermined modulation and coding scheme table may be the modulation and coding scheme table 3, and the bit rate below 120*1024 (Kbps) is only in table 3. Thus , the configuration information may be a newly defined radio network temporary identity (RNTI) or a field in the newly defined downlink control information (DCI). If the terminal device has detected the configuration information, the terminal device may assume that the current transmission scenario is a multi-station uRLLC scenario; or, if the terminal device has not detected the configuration information, the terminal device may assume that the current transmission scenario is an eMBB scenario with multiple stations.

In an exemplary implementation, configuration information related to an existing multi-station uRLLC scenario, such as modulation and coding scheme cell radio network temporary identity (MCS-C-TNTI), may be reused as configuration information. . If the terminal device has detected the MCS-C-RNTI, the terminal device may assume that the current transmission scenario is the multi-station uRLLC scenario; or, if the terminal device has not discovered the MCS-C-RNTI, the terminal device may assume that the current transmission scenario is an eMBB multi-station scenario.

In an exemplary implementation, the configuration information may be used to directly indicate that the current transmission scenario is a multi-station uRLLC scenario. If the terminal device has detected the configuration information, the terminal device may assume that the current transmission scenario is a multi-station uRLLC scenario; or, if the terminal device has not detected the configuration information, the terminal device may assume that the current transmission scenario is an eMBB scenario with multiple stations. Thus, the configuration information may be a newly defined RNTI or a field in a newly defined DCI.

In another possible implementation, the configuration information may be considered as configuration information indicating an eMBB scenario, for example, indicating an exclusive feature of a multi-station eMBB scenario, or indicating that configuration information related to an existing multi-station eMBB scenario is reused, or indicating that that the configuration information can be directly used to indicate that the current transmission scenario is an eMBB scenario with multiple stations.

The transmission mode indicator information may be carried in downlink control information radio resource control signaling. The transmission mode is one or more of: a space division multiplexing mode, a first frequency division multiplexing mode, a second frequency division multiplexing mode, a first time division multiplexing mode, or a second time division multiplexing mode. The first frequency division multiplexing mode is a frequency division multiplexing mode based on a single codeword, the second frequency division multiplexing mode is a frequency division multiplexing mode based on multiple codewords, the first time division multiplexing mode is a multiplexing mode time division multiplexing in a slot block, and the second time division multiplexing mode is a time division multiplexing mode between slot blocks.

The third aspect of the embodiments of the present application provides a communication device. The communications device may be a terminal device, a device within a terminal device, or a device that can be used in conjunction with a terminal device. The communication device has some or all of the functions of the terminal device in the exemplary method in the first aspect or in the second aspect. For example, a terminal device may have the functions of implementing some or all of the embodiments of the present application, or may have the functions of a separate implementation of any embodiment of the present application. The functions may be implemented in hardware, or may be implemented in hardware running corresponding software. The hardware or software includes one or more blocks or modules corresponding to the above functions.

In a possible implementation, the structure of the terminal device may include a processing unit and a transceiver unit. The processing unit is configured to support the terminal device in executing the respective functions in the above method. The transceiver unit is configured to maintain communication of the terminal device with another device. The terminal device may further include a storage unit. The storage unit is configured to be connected to the processing unit and the transceiver unit and stores the program instruction and data that are necessary for the terminal device.

In an implementation, the terminal device includes a processing unit and a transceiver unit.

The transceiver unit is configured to obtain configuration indicator information, where the configuration indicator information is one or more of: DMRS indicator information, retransmission indicator information, or transmission configuration indicator information.

The processing unit is configured to determine the transmission mode based on the configuration indicator information, where the transmission mode is one or more of: a space division multiplexing mode, a frequency division multiplexing mode, or a time division multiplexing mode.

For example, the processing unit may be a processor, the communication unit may be a transceiver, and the storage unit may be a memory.

In an implementation, the terminal device includes a processor and a transceiver.

The transceiver is configured to obtain configuration indicator information, where the configuration indicator information is one or more of: DMRS indicator information, retransmission indicator information, or transmission configuration indicator information.

The processor is configured to determine a transmission mode based on the configuration indicator information, where the transmission mode is one or more of: a space division multiplexing mode, a frequency division multiplexing mode, or a time division multiplexing mode.

In a particular implementation process, the processor may be configured to, for example, perform, but not limit, baseband processing; and the transceiver may be configured to, for example, perform, but not limit, RF receiving and sending. The above components may be located separately on the chips, independently of each other, or at least some or all of the components may be located on the same chip. For example, the processor may be further divided into an analog baseband processor and a digital baseband processor. The analog baseband processor and the transceiver may be integrated on the same chip, and the digital baseband processor may be located on an independent chip. With the continuous development of integrated circuit technology, more components can be integrated into the same chip. For example, a digital baseband processor and a plurality of application processors (such as, but not limited to, a graphics processor and a media processor) may be integrated on the same chip. Such a chip may be referred to as a system on a chip. Whether the components are located on different chips or integrated and placed on one or more chips usually depends on the specific performance requirements of the product. The specific implementation forms of the components are not limited to the embodiments of the present invention.

A fourth aspect of the embodiments of the present application provides a processor capable of performing the above methods. In the process of performing these methods, the process of sending the above information or data and the process of receiving the above information or data in the above methods can be understood as the process of outputting the above information or data by the processor and the process of receiving the above input information or data by the processor. In particular, when information or data is output, the processor outputs the information or data to the transceiver so that the transceiver transmits the information or data. In addition, after the information or data is output by the processor, other information or data processing may need to be performed before the information or data reaches the transceiver. Similarly, when the processor receives input or data, the transceiver receives the information or data and inputs the information or data to the processor. In addition, after the transceiver receives the information or data, other information or data processing may need to be performed before the information or data is input to the processor.

For example, based on the above principle, receiving the configuration information given in the above method can be considered as the transceiver inputting the received configuration information to the processor.

In this case, for operations such as transmitting, sending, and receiving that are processor-specific, if a specific statement is missing, or if the operations do not conflict with the actual function or internal logic of the operations in the respective descriptions, in a more general sense, the operations can be considered as operations, such as input, receive and output performed by the processor rather than operations such as transmit, send and receive directly performed by the RF circuit and antenna.

In a particular implementation, the processor may be a processor specifically configured to perform these methods, or a processor, such as a general purpose processor, configured to execute a computer instruction in memory to perform these methods. The memory may be non-volatile memory such as read only memory (ROM). The memory and processor may be integrated on the same chip, or they may be located separately on different chips. The type of memory and the arrangement of the memory and the processor are not limited in the embodiments of the present invention.

A fifth aspect of embodiments of the present application provides a system on a chip. The system-on-a-chip includes at least one processor and an interface, and is configured to support the terminal device in implementing functions in the first aspect or the second aspect, such as determining a transmission mode based on configuration indicator information.

In a possible implementation, the system on a chip further includes a memory. The memory is configured to store the program instruction and data required by the terminal device. A system on a chip may include a chip, or may include a chip and another discrete component.

A sixth aspect of the embodiments of the present application provides a computer-readable storage medium capable of storing a computer software instruction used by the aforementioned terminal device. The computer software instruction includes a program capable of executing the method according to the first aspect or the second aspect.

A seventh aspect of embodiments of the present application provides a computer program product including an instruction. When the computer program product is run on the computer, the computer is enabled to execute the method according to the first aspect or the second aspect.

An eighth aspect of the embodiments of the present application provides a computer program including an instruction. When the computer program is run on the computer, the computer is enabled to execute the method according to the first aspect or the second aspect.

Brief description of the drawings

Fig. 1 is a schematic representation of a network architecture in which an embodiment of the present application is applied;

fig. 2 is a schematic representation of another network architecture in which an embodiment of the present application is applied;

fig. 3a is a schematic representation of an example of a transmission in a space division multiplexing mode;

fig. 3b is a simplified diagram of a physical layer processing procedure in a space division multiplexing mode;

fig. 4a is a schematic representation of an example of a transmission in a frequency division multiplexing mode;

fig. 4b is a simplified diagram of a physical layer processing procedure in a first frequency division multiplexing mode;

fig. 4c is a simplified diagram of a physical layer processing procedure in a first frequency division multiplexing mode;

fig. 5a is a schematic representation of an example of a transmission in a first time division multiplexing mode;

fig. 5b is a schematic representation of an example of a transmission in a second time division multiplexing mode;

fig. 5c is a simplified diagram of a physical layer processing procedure in a time division multiplexing mode;

fig. 6 is a flowchart of a transmission mode determination method according to an embodiment of the present application;

fig. 7 is a flowchart of another transmission mode determination method according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application; And

fig. 9 is a schematic block diagram of a terminal device according to an embodiment of the present application.

Implementation of the invention

The technical solutions are described below with reference to the accompanying drawings according to embodiments of the present application. Unless otherwise indicated, "/" in the descriptions of embodiments of the present application represents an "or" relationship between associated objects. For example, A/B may be A or B. In the description of the present application, the term "multiple" means two or more than two, unless otherwise indicated. "At least one element (part) of the following" or a similar expression refers to any combination of these elements, including any combination of single elements (parts) or multiple elements (parts). For example, at least one element (part) of a, b, or c may be: a, b, c, ab, ac, bc, or abc, where a, b, and c may be singular or plural. In addition, in order to clearly describe the technical solutions in the embodiments of the present application, terms such as "first" and "second" are used in the embodiments of the present application in order to distinguish between technical features that have basically the same or similar functions and purposes. . One skilled in the art can understand that terms such as "first" and "second" do not limit the number or sequence of execution, and that terms such as "first" and "second" do not indicate a particular difference.

Embodiments of the present application can be applied to a Long Term Evolution (LTE) system and an NR system, and can be applied to a future communication system such as a future network or a sixth generation communication system. Embodiments of the present application can be applied to a device-to-device (D2D) communication system, a machine-to-machine (M2M) communication system, a vehicle-to-everything (V2X) communication system, etc. .P.

Communication methods in a V2X system are generally referred to as V2X communication. V2X communication is designed for high-speed devices such as vehicles and will be the core and key technology in the future for very high latency scenarios. For example, the scenario could be an intelligent vehicle, autonomous driving, or an intelligent transportation system. For example, V2X communication includes vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P), vehicle-to-vehicle (V2P), vehicle to network (V2N), etc. Communication between terminal devices in a V2X system is broadly referred to as lateral link (slidelink, SL) communication. In other words, the terminal in the present application may alternatively be a vehicle or a vehicle component used in a vehicle.

In FIG. 1 shows a schematic representation of a V2X system according to an embodiment of the present application. The schematic representation includes V2V communication, V2P communication and V2I/N communication.

As shown in FIG. 1, vehicles or vehicle components communicate with each other using a V2V system. The vehicle or vehicle component may broadcast information such as vehicle speed, direction of travel, specific location, and whether an adjacent vehicle has applied the emergency brake. The driver of a nearby vehicle can better know the traffic condition beyond the line of sight by getting the information, and thus can predict the risk state in advance and avoid it. The vehicle or vehicle component interacts with the roadside infrastructure using a V2I system, and the roadside infrastructure can provide various service information and data network access to the vehicle or vehicle component. Features such as non-stop tolling and in-vehicle entertainment greatly enhance smart transportation. A roadside infrastructure such as a road side unit (RSU) includes two types: a terminal device type RSU and a network type RSU. Since the RSUs are distributed on the roadside and the terminal unit type RSU is stationary, mobility does not need to be taken into account. A network device type RSU may provide time synchronization and resource scheduling for a vehicle or vehicle component that communicates with the network device. The vehicle or its component communicates with people using the V2P system. The vehicle or vehicle component interacts with the network using the V2N system. The network architecture and service scenario that are described in the embodiments disclosed in this application are intended to more clearly describe the technical solutions in the embodiments disclosed in this application, and do not represent a limitation of the technical solutions presented in the embodiments disclosed in this application. . A person skilled in the art may be aware that with the development of network architecture and the emergence of new service scenarios, the technical solutions presented in the embodiments disclosed in this application are also applicable to similar technical problems.

In FIG. 2 shows a schematic representation of another network architecture in which an embodiment of the present application is applied. The network architecture may include three network devices and one terminal device. The number of devices and types of devices shown in FIG. 2 are used as examples and do not limit the embodiments of the present application. In the actual application, one, two or more network devices and two or more terminal devices may be included. The network device may be configured to communicate with the terminal device via a wireless interface under the control of a network device controller (not shown). In some embodiments, the network device controller may be part of the core network, or may be integrated into the network device. The network device may be configured to transmit control information or user data to the core network via a backhaul interface. Network devices can also communicate directly or indirectly with each other through a backhaul interface.

In this embodiment of the present application, a network device can be any device having the function of a wireless transceiver, including, without limitation, a base station in an LTE system, a gNodeB (gNodeB or gNB) in an NR system, a transmission receiving point/transmission reception point, TRP) in the NR system, a base station to be further developed in 3GPP, an access node in a Wi-Fi system, a wireless relay node, a wireless transport network node, and the like. The base station may be a macro base station, a micro base station, a pico cell base station, a small cell, a relay station, a balloon station, and the like. A plurality of base stations may support the above networks with the same technology, or may support the above networks with different technologies. The base station may include one or more TRPs with a shared or non-shared site. In an implementation, the TRP may be a network device such as a base station, or may be an antenna panel, panel, or the like. base station. Alternatively, the network device may be a radio controller, a centralized unit (CU), and/or a distributed unit (DU) in a cloud radio access network (CRAN) scenario. Alternatively, the network device may be a server, a wearable device, a vehicle-mounted device, or the like. An example in which the network device is a base station is used for description below. The plurality of network devices may be base stations of the same type or base stations of different types. The base station may communicate with the terminal device or may communicate with the terminal device via a relay station.

The terminal device is a device having wireless receiving and sending functions and can be deployed on land, where the deployment includes deploying the device indoors or outdoors, a portable device, a wearable device, or a device mounted on a vehicle; can be placed on the water (for example, on a ship); or may be deployed in the air (eg by aircraft, balloon and satellite). The terminal device can be a mobile phone (mobile phone), a tablet computer (Pad), a computer with wireless receiving and sending functions, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control system, vehicle-mounted terminal device, wireless terminal in self driving system, wireless terminal in remote medical system, wireless terminal in smart grid, wireless a transport safety terminal, a smart city wireless terminal, a smart home wireless terminal, a wearable terminal device, and the like. The application scenario is not limited to the embodiments of the present application. A terminal device may also sometimes be referred to as a terminal, user equipment (UE), access terminal, vehicle-mounted terminal, industrial control system terminal, UE, UE, mobile station, mobile console, remote station, remote a terminal device, a mobile device, a UE agent, a UE device, and the like. The terminal device may be stationary or mobile.

To improve reliability, a common technique is to use channel diversity gain. Diversity gain includes channel diversity in at least one dimension, such as time domain, frequency domain, or space domain. Channel diversity gain refers to low channel correlation in at least one dimension, such as time domain, frequency domain, or spatial domain; or statistically independent characteristics that channels have at multiple transmission times in at least one dimension such as time domain, frequency domain, or space domain, so these independent channels can be used in the communication process, thereby reducing the impact of channel fading.

The channel diversity gain may be, for example, independent channel diversity gain of multiple stations. There may be a plurality of network devices in a network, and coordinated transmission, that is, a coordinated multi-station transmission technique, can be performed between the plurality of network devices. In the coordinated multi-station transmission technology, a terminal apparatus may be scheduled by a plurality of network apparatuses. For example, a plurality of network devices schedule a terminal device to receive a plurality of pieces of data. Thus, it is possible to improve the user's throughput and the user's perceived speed. Conversely, a terminal device may alternatively send data to a plurality of network devices, and a plurality of network devices may individually receive data and further combine data. Multiple network devices may be geographically different, so multiple independent links from multiple network devices have low correlation with a terminal device. Thus, the coordinated multi-station transmission technology can be applied to a scenario that has a relatively high requirement for communication reliability, so the system can use a low-correlation channel diversity gain.

At present, in the uRLLC scenario of the NR system, a plurality of retransmission methods based on the coordinated multi-station technology can be supported. The retransmission techniques can be classified into spatial domain, frequency domain, and time domain retransmission techniques. There are currently five retransmission methods. In this description, the five retransmission methods are referred to as transmission modes. The network device may send data to the terminal device using one or more transmission modes. The terminal device needs to identify the transmission mode used by the network device in order to perform appropriate reception and processing.

Embodiments of the present application provide a method for determining a transmission mode and an apparatus so that a terminal device can identify the transmission mode used by a network device in order to perform appropriate reception and processing. Embodiments of the present application can be used to distinguish between the plurality of transmission modes in the uRLLC scenario, and the plurality of transmission modes is not limited to the five current transmission modes. Embodiments of the present application may further be used to distinguish between a multi-station uRLLC scenario and a multi-station eMBB scenario.

The network architecture and service scenario that are described in the embodiments of the present application are intended to more clearly describe the technical solutions in the embodiments of the present application and do not represent a limitation of the technical solutions provided in the embodiments of the present application. A person skilled in the art may be aware that with the development of network architecture and the emergence of new service scenarios, the technical solutions presented in the embodiments of the present application are also applicable to similar technical problems.

Before the embodiments of the present application are described, the following is a first description of the names or terms used in the embodiments of the present application.

(1) Several transmission modes used in embodiments of the present application

1. Spatial multiplexing mode

SDM is a spatial domain retransmission mode and means that multiple TRPs transmit the same transport block together. TRP distributes blocks of data on the same frequency-time resource, and the blocks of data are mapped to different antenna ports. Thus, spatial diversity gain can be used.

Data is transferred from the media access control (MAC) layer to the physical layer in the form of one or more transport blocks (transport block, TB). One TB is sent from the MAC layer to the physical layer. The network device performs a channel coding process for each TB, performs rate matching on a transport block obtained after executing the channel coding process, and stores the transport block in a ring buffer. A codeword (CW) derived from a ring buffer based on a redundancy version (RV) can be considered an error-protected TV. After layer matching is performed for a codeword, the codeword is mapped to one or more data layers (abbreviated as layer), and each data layer corresponds to one actual data stream. The data stream at each layer is mapped to an antenna port through antenna port mapping. The process of mapping an antenna port may also be referred to as precoding, that is, the process of mapping a data stream at each layer to an antenna port using a precoding matrix. The precoded data stream is mapped to a physical time-frequency resource and converted to a signal. The signal is sent by the network device.

For example, in FIG. 3a shows a schematic representation of an example of a transmission in a space division multiplexing mode. In FIG. 3a, TRP 1 and TRP 2 schedule the same time frequency resource, and the scheduling unit in the time domain of the time frequency resource is a slot (slot) or a mini-slot (mini-slot). The antenna port used by TRP 1 to transmit the physical downlink shared channel (PDSCH) 1 is different from the antenna port used by TRP 2 to transmit PDSCH 2. The different antenna ports refer to the physical layer processing procedure as shown in fig. 3b. In FIG. 3b shows a simplified diagram of a physical layer processing procedure in a space division multiplexing mode.

In FIG. 3b, TRP 1 and TRP 2 transmit one transport block together, and TRP 1 or TRP 2 may perform a channel coding process and a rate matching process on the transport block. The channel coding process and the rate matching process are performed in a transport block, and CW is obtained based on one redundancy version. Then, in a layer matching process, the CW is mapped to two data layers, such as layer 0 and layer 1. The data stream in data layer 0 is mapped to antenna port 0 by antenna port mapping; and the data stream in layer 1 of the data layer is mapped to the antenna port 2 by mapping the antenna port. Resource matching is then performed with the data stream at antenna port 0 to receive PDSCH 1, and resource matching is performed with the data stream at antenna port 2 to obtain PDSCH 2. PDSCH 1 and PDSCH 2 are mapped to the same time-frequency resource. In addition, TRP 1 may send PDSCH 1 and TRP 2 may send PDSCH 2. PDSCH 1 carries half of the transport block information bits and PDSCH 2 carries the other half of the transport block information bits.

In another possible implementation, in the antenna port mapping process, the data stream at data layer layer 0 is mapped to CDM group 0 by antenna port mapping; and the data flow in layer 1 of the data link layer is mapped to CDM group 1 by mapping the antenna port. That is, for the SDM mode, in the antenna port mapping process, data streams in different data layers can be mapped to different CDM groups.

The SDM mode is similar to the multistation eMBB transmission mode. The SDM mode may also be referred to as scheme 1a (scheme 1a), a spatial multiplexing scheme, and the like.

2. Frequency division multiplexing mode

The FDM mode is a frequency domain retransmission mode and means that a plurality of TRPs jointly transmit the same transport block or a plurality of TRPs transmit every one transport block. The frequency domain resources scheduled by different TRPs are different, and the time domain resources scheduled by different TRPs are the same. During FDM transmission, one or more antenna ports may be used by multiple TRPs.

For example, in FIG. 4a shows a schematic representation of an example of a transmission in a frequency division multiplexing mode. As shown in FIG. 4a, the time domain resources scheduled by TRP 1 and TRP 2 are the same, and the frequency domain resources scheduled by TRP 1 and TRP 2 are different and do not overlap at all. Having two TRPs perform an FDM transmission is equivalent to each TRP scheduling half of the frequency domain resources. Thus, there is a power boost of 3 decibels (dB), and this is the main source of FDM gain.

The FDM mode can be divided into an FDM mode based on a single codeword and an FDM mode based on a plurality of codewords. A single codeword FDM is an FDM based on a single redundant version of a single codeword. Multiple Codeword FDM is an FDM based on multiple redundancy versions of multiple codewords.

To make it easier to distinguish between the embodiments of the present application, the single codeword FDM is referred to as the first FDM, and the multiple codeword FDM is referred to as the second FDM. The single codeword FDM mode may also be referred to as scheme 2a or the like, and the multiple codeword FDM mode may also be referred to as scheme 2b or the like.

For the first FDM mode, refer to FIG. 4b, which shows a simplified diagram of the physical layer processing procedure in the first frequency division multiplexing mode. In FIG. 4b, TRP 1 and TRP 2 transmit one transport block together, and TRP 1 or TRP 2 may perform a channel coding process and a rate matching process on the transport block. After performing the channel coding process and the rate matching process in the transport block, CW is obtained based on one redundancy version. The CW is then mapped to one or two data layers in a layer matching process. The CW is then mapped to one or two antenna ports in the antenna port mapping process. If CW is mapped to one data layer during layer matching, CW is mapped to one antenna port during antenna port mapping. If the CW is mapped to two data layers in the layer matching process, the CW is mapped to two antenna ports in the antenna port mapping process. Then, in a resource matching process, the CW is mapped to two parts of the frequency domain resources that do not overlap at all to obtain PDSCH 1 and PDSCH 2. PDSCH 1 carries half of the transport block information bits, and PDSCH 2 carries the other half of the transport block information bits. .

For the second FDM mode, refer to FIG. 4c, which shows a simplified diagram of the physical layer processing procedure in the second frequency division multiplexing mode. In FIG. 4c, TRP 1 and TRP 2 each transmit an identical transport block. After performing the channel coding process and the rate matching process in one transport block, CW is obtained based on redundancy version 0. After performing the channel coding process and the rate matching process in another transport block, a different CW is obtained based on redundancy version 1. The redundancy versions of the two CWs are different. Then, in a layer matching process, the two CWs are mapped to the same data layer. Then, in the antenna port mapping process, the two CWs are mapped to the same antenna port, for example, port 0. Then, in the resource mapping process, the two CWs are mapped to two parts of the frequency domain resources that do not overlap at all to obtain PDSCH 1 and PDSCH 2. PDSCH 1 and PDSCH 2 carry the information bits of the same transport block, but different redundant bits are added. The terminal device may merge the soft bits with the information to obtain the merge gain.

3. Time division multiplexing mode

The TDM mode is a time domain retransmission mode and means that each of the multiple TRPs transmits one transport block. The time domain resources scheduled by different TRPs do not overlap at all, and the frequency domain resources transmitted and scheduled by different TRPs are the same. In TDM mode, one or more antenna ports may be used by multiple TRPs during transmission. TDM uses low channel temporal correlation to improve transmission reliability.

The TDM mode can be divided into the TDM mode in a slot unit and the TDM mode between slot units. The slot block may be a slot or a mini-slot. One slot may include 14 symbols and may be designed to include a different number of symbols in the future. The number of symbols included in one mini slot is less than the number of symbols included in one slot. For example, one mini-slot may include two, six, or seven symbols. The symbol may be an orthogonal frequency division multiplexing (OFDM) symbol, a discrete Fourier transform orthogonal frequency division multiplexing (DFT-S-OFDM) symbol. or the like.

To make it easier to distinguish between embodiments of the present application, the TDM mode in a slot block is referred to as the first TDM mode, and the TDM mode between slot blocks is referred to as the second TDM mode. The slot block TDM mode may also be referred to as scheme 3, mini-slot based TDM mode, and the like. The inter-slot TDM mode may also be referred to as scheme 4, slot-based TDM mode, inter-slot TDM mode, and the like.

For example, in FIG. 5a shows a schematic representation of an example of transmission in the first time division multiplexing mode. In FIG. 5a, the frequency domain resources scheduled by TRP 1 and TRP 2 are the same, and all the time domain resources scheduled by TRP 1 and TRP 2 are located in slot n and do not overlap each other at all.

For example, in FIG. 5b shows a schematic representation of an example of transmission in the second time division multiplexing mode. In FIG. 5b, the frequency domain resources scheduled by TRP 1 and TRP 2 are the same, the time domain resource scheduled by TRP 1 is located in slot n, and the time domain resource scheduled by TRP 2 is located in slot n+1. The resources in the time domain are distinct and do not overlap at all.

In FIG. 5c shows a simplified diagram of a physical layer processing procedure in a time division multiplexing mode. In FIG. 5c, TRP 1 and TRP 2 each transmit an identical transport block. The channel coding process and the rate matching process are performed in the same transport block, and CW is obtained based on the redundancy version. The channel coding process and the rate matching process are performed in a different transport block, and a different CW is obtained based on the redundancy version. The redundancy versions of the two CWs may be the same or different. In FIG. 5c, for example, the redundancy versions of the two CWs are different. In the layer mapping process, two CWs are mapped to one or more data layers. In the antenna port mapping process, two CWs are mapped to one or more antenna ports. Finally, in the resource matching process, two PDSCHs are mapped to the same resource in the frequency domain, but transmitted at different times. Thus, the time domain resources of PDSCH 1 and PDSCH 2 are different.

In addition to the first TDM mode and the second TDM mode, the TDM mode may further include a combined transmission mode from the first TDM mode and the second TDM mode. In the combined transmission mode, PDSCH retransmission occupies both an in-slot symbol and an inter-slot symbol. In other words, the PDSCH is retransmitted both within a slot and between slots. For example, if the length of the time domain resource occupied by the PDSCH is two consecutive symbols, in one TRP 1 and TRP 2 retransmission process, the time domain resource occupied by the PDSCH may include the third, fourth, ninth, and tenth symbols in slot n and the third, fourth, ninth and tenth characters in slot n+1. The PDSCH on the ninth and tenth symbols in slot n is a repeat of the PDSCH on the third and fourth symbols in slot n. The PDSCH on the third and fourth symbols in slot n+1 is a repetition of the PDSCH on the third and fourth symbols in slot n between slots.

In the physical layer processing procedures for the above several transmission modes, the relationship between the antenna port index and the DMRS port index is as follows: antenna port index = DMRS port index + 1000.

It should be noted that the names of several of the aforementioned transmission modes are used as examples and do not limit the embodiments of the present application. Several of the aforementioned transmission modes may also have other names. Any other transmission modes whose technical entities or principles are the same or similar to those of several of the aforementioned transmission modes fall within the protection scope of embodiments of the present application.

It should be noted that after determining one or more transmission modes according to the embodiments presented in this application, the terminal device takes certain actions or interprets some parameters or parameter areas in a manner different from the prior art. Thus, when the terminal device performs the following behavior or interpretation, this can also be considered as determining the appropriate transmission mode by the terminal device. In other words, the process in which the terminal device determines the transmission mode may be reflected by the execution of the corresponding operation or the interpretation of some parameters or some parameter areas by the terminal device.

In SDM mode, the terminal device maps different TCI states to different CDM groups corresponding to different DMRS ports. For example, the terminal device may perform a one-to-one matching in ascending order of the CDM group identifiers. This operation implicitly indicates that the terminal device determines, in accordance with the method presented in the embodiments of the present application, that the transmission mode is the SDM mode.

In the first FDM mode, the terminal device maps different TCI states to different resources in the frequency domain. In addition, the terminal device performs one or more of the following operations:

1. Read the value of the redundancy version (RV) field in DCI. For example, reading may be performed in the manner described in Rel-15.

2. Get the corresponding RV based on the RV table. Data carried in different frequency domain resources use the same RV. For example, you can use the RV table in version 15 (Rel-15), and one RV table is given as the following table 0-1.

Table 0-1

Value of the redundancy version field Meaning to apply (Value of to be applied) 00 0 01 1 10 2 eleven 3

Any one or more of the above operations implicitly indicate that the terminal device determines, in accordance with the method presented in the embodiments of the present application, that the transmission mode is the first FDM mode.

In the second FDM mode, the terminal device maps different TCI states to different resources in the frequency domain. In addition, the terminal device performs one or more of the following operations:

1. Get RV based on RV table. A feature of the RV table is that each entry (entry) can indicate more than one RV. In this case, the terminal device associates different redundancy versions with different TCI states. The RV table is shown as the following tables 0-2 and 0-3, where value is one of RV {0, 2, 3, 1} and the sequence can be changed. For example, when the terminal device determines, in accordance with the method presented in the embodiments, that the transmission mode is the second FDM mode, the terminal device obtains more than one RV (for example, 0 and 2) from the RV table based on the value of the RV area in the DCI . In this case, the terminal device separately associates RV 0 and RV 2 with the first and second TCI states and performs the following operation, for example, performs soft combining of data carried on different resources in the frequency domain to which the TCI states are mapped.

Table 0-2

Reservation version id indicated by the DCI scheduling the PDSCH (rv _id indicated by the DCI scheduling the PDSCH) RV associated with the first TCI state, and RV associated with the second TCI state (RV associated with first TCI state, RV associated with second TCI state) Value 1 0.2 Value 2 0.3 Value 3 0, 1 Meaning 4 0, 0

Table 0-3

Reservation version id indicated by the DCI scheduling the PDSCH (rv _id indicated by the DCI scheduling the PDSCH) RV associated with the first TCI state, and RV associated with the second TCI state (RV associated with first TCI state, RV associated with second TCI state) Value 1 0.2 Value 2 0.3 Value 3 20 Meaning 4 thirty

2. Read the value of the reservation version field in DCI and take additional steps. For example, the RV derived from the RV field is used to indicate only the RV (similar to Rel-15) of one PDSCH (or the data transmitted on the frequency domain resource to which the PDSCHs are mapped), and the RV of the other PDSCH is RV 0 by default. In this case, the terminal device respectively associates the two RVs with the first and second TCI states and performs the following operation, for example, performs soft combining of data carried in different frequency domain resources to which the TCI states are mapped.

3. Use a new RV field, different from the RV field in Rel-15. The terminal device can directly obtain more than one RV from the new RV field, respectively, associate more than one RV with more than one TCI state, and then perform the following operation. Details are not described here.

Any one or more of the above operations implicitly indicate that the terminal device determines, in accordance with the method presented in the embodiments of the present application, that the transmission mode is the second FDM mode.

In the first TDM mode, the terminal device maps different TCI states to different resources in the time domain. In addition, the terminal device performs one or more of the following operations, for example:

1. The terminal device is limited to performing PDSCH transmission only within the current slot.

2. The terminal device performs X times PDSCH transmission in the current slot, where X may be 2 or 4. In this case, the terminal device sequentially maps different TCI states on X different time domain resources. A specific matching method may be one-to-one matching or round-robin matching. For example, if X=2, the TCI states associated with the two PDSCHs are {TCI state #1, TCI state #2}; if X is 4, the TCI states associated with the four PDSCHs are {TCI state #1, TCI state #2, TCI state #1, TCI state #2}.

3. The terminal device obtains the number A of repetitions in the time domain by reading a specific field or parameter, for example, a field indicating the number of repetitions or resource allocation in the time domain, and sequentially maps different TCI states to different resources in the time domain.

Any one or more of the above operations implicitly indicate that the terminal device determines, in accordance with the method presented in the embodiments of the present application, that the transmission mode is the first TDM mode.

In the second TDM mode, the terminal device maps different TCI states to different resources in the time domain. In addition, the terminal device performs one or more of the following operations, for example:

1. The terminal device is limited to performing PDSCH transmission only within N consecutive slots.

2. The terminal device obtains the number of B repetitions in the time domain by reading a specific field or parameter, for example, a field indicating the number of repetitions or resource allocation in the time domain, and sequentially maps different TCI states to B successive slots. There may be a plurality of mapping methods, for example, the mapping method may be the same as in the first TDM mode. It is not limited in this document.

3. The terminal device reads the pdsch-AggregationFactor RRC signaling indicating the number of transmission repetitions in the time domain in Rel-15 or a higher layer signaling having a similar function, and sequentially maps different TCI states to successive pdsch-AggregationFactor slots. The matching method is not limited. Any one or more of the above operations implicitly indicate that the terminal device determines, in accordance with the method presented in the embodiments of the present application, that the transmission mode is the second TDM mode.

(2) Transmission configuration indication (TCI)

TCI is a pointer field in dynamic control signaling and indicates the TCI state of each data transfer process. The dynamic control signaling may be downlink control information (DCI).

The TCI state is a field in DCI that is used to indicate the quasi-co-location (QCL) of the PDSCH antenna port, is used to configure the quasi-co-location relationship between one or two downlink reference signals and the DMRS PDSCH, and can be considered as a channel characteristic the current PDSCH transmission process. Thus, the terminal apparatus can learn the large scale channel ratio indicator information of the received PDSCH based on the TCI state, and further demodulate the data transmitted on the PDSCH based on the channel estimate. During PDSCH transmission in a coordinated multistation transmission scenario for a terminal device, different TRPs have different TCI states.

Based on the number of TCI states, a single-station transmission scenario and a multi-station transmission scenario can be distinguished. The TCI state is pointer information used to indicate the large scale parameter of the PDSCH. Thus, the maximum characteristic of a multicast scenario is to have multiple TRPs with completely different channel conditions, so channel diversity gain can be used. When there are multiple TCI states, the terminal device may consider that the current transmission scenario is a multi-station transmission scenario.

(3) Quasi-joint arrangement

The QCL is used to indicate that a plurality of resources have one or more of the same or similar communication capabilities. For example, if two antenna ports are co-located, then the coarse channel response for transmitting one signal through one antenna port can be derived from the coarse channel response for transmitting one signal through the other antenna port. The signals corresponding to the antenna ports that have the QCL ratio have the same parameter, or the parameter of one antenna port can be used to determine the parameter of another antenna port that has the QCL ratio with the antenna port, or two antenna ports have the same parameter or parameter difference between two antennas ports is less than the specified value. The parameter may include one or more of the following large-scale channel parameters: delay spread, Doppler spread, Doppler shift, average delay, and average gain, and a spatial diversity parameter ( spatial Rx parameter). The space diversity parameter may include one or more of: Angle of arrival (AoA), dominant angle of arrival (Dominant AoA), average angle of arrival (Average AoA), angle of departure (Angle of departure, AoD), channel correlation matrix, power angular spread spectrum with angle of arrival, average angle of arrival (Average AoD), power angular spread spectrum with angle of arrival, transmit channel correlation, receive channel correlation, transmit beamforming, receive beamforming, spatial correlation - channel diversity, a spatial filter or a spatial filtering parameter or a spatial diversity reception parameter, and the like.

In FIG. 3a, fig. 4a and fig. 5a The QCL sent by TRP 1 to the terminal device is different from the QCL sent by TRP 2 to the terminal device. The terminal device can know, based on different QCLs, that data is coming from different TRPs, so the terminal device can determine, based on a plurality of QCLs, that the current transmission scenario is a multistation transmission scenario.

(4) CDM group

A CDM group can also be described as a CDM antenna port group. Multiple antenna ports in a CDM group may use the same time frequency resource but use different code domain resources. The terminal device assumes that there is a QCL relationship between DMRS ports in the same CDM group. In other words, the channel state characteristics of the DMRS ports in the same CDM group are similar. This can be understood as that the DMRS ports belong to the same TRP, or it can be considered that data transmitted by antenna ports in the same CDM group can be received simultaneously.

It should be noted that DMRS ports of different TRPs are generally considered to have a non-QCL relationship, that is, a non-QCL relationship.

A DMRS CDM group can also be described as a DMRS CDM antenna port group, and is used to denote a CDM group to which a DMRS port for DMRS transmission belongs.

Based on the network architecture shown in FIG. 1 or fig. 2, the transmission mode determination method provided in the embodiments of the present application will now be described in detail. It should be noted that in the descriptions, the names of information or data exchanged between the terminal device and the network device are used as examples and do not limit the embodiments of the present application.

In FIG. 6 is a flowchart showing a transmission mode determination method according to an embodiment of the present application. The procedure may include, but is not limited to, the following steps.

Step 601: The network device sends configuration indicator information to the terminal device. Accordingly, the terminal device receives configuration indicator information from the network device.

The configuration indicator information is one or more of: DMRS indicator information, retransmission indicator information, or TCI information.

The network device may configure the DMRS indicator information for the terminal device and send the DMRS indicator information to the terminal device. The network device may send DMRS indicator information to the terminal device using dynamic control signaling, and the dynamic control signaling may be DCI. In other words, the DMRS pointer information may be carried in the DCI.

The DMRS pointer information may be a value (value) or an index (index), and may be used as an entry in a DMRS table to search the DMRS table for a DMRS parameter corresponding to the value. For example, the following table 1 is a DMRS table in Release 15, and the DMRS table is a DMRS table whose DMRS type is 1 and has one character. The DMRS table is used as an example and does not impose restrictions on the embodiments of the present application.

Table 1

value Number of CDM groups without data DMRS port 0 1 0 1 1 1 2 1 0, 1 3 2 0 4 2 1 5 2 2 6 2 3 7 2 0, 1 8 2 2, 3 9 2 0-2 10 2 0-3 eleven 2 0.2 12-15 Reserved Reserved

Table 1 is known to both the network device and the terminal device. In other words, the DMRS table is configured on both the network device and the terminal device. The terminal device can obtain, by looking up the table, two DMRS parameters corresponding to the value. The two DMRS parameters are, respectively, the number of CDM groups without data and the DMRS port. The number of CDM groups without data is the number of CDM DMRS groups without data (or the number of CDM DMRS groups without data) and is used for rate negotiation. The DMRS port is used to notify the DMRS port and CDM group that the terminal device is using. Table 1 lists the four DMRS port IDs: [0], [1], [2], and [3]. DMRS port [0] and DMRS port [1] belong to CDM group {0}, in other words, CDM group {0} includes DMRS port [0] and DMRS port [1]. DMRS port [2] and DMRS port [3] belong to CDM group {1}, in other words, CDM group {1} includes DMRS port [2] and DMRS port [3].

For example, the value indicated by the DMRS pointer information is 2, the terminal device can obtain, by table lookup, that the number of CDM groups without data is 1, and the DMRS ports are [0] and [1]. The two DMRS ports belong to the {0} CDM group. In another example, the value indicated by the DMRS pointer information is 11, the terminal device can obtain, by table lookup, that the number of CDM groups without data is 2, and the DMRS ports are [0] and [2]. The two DMRS ports respectively belong to CDM group {0} and CDM group {1}.

The DMRS pointer information may directly indicate the value in the DMRS table and further indirectly indicate one or more DMRS port IDs corresponding to the value, or indirectly indicate the CDM group corresponding to the value, or indirectly indicate the number of CDM groups with no data and one or more DMRS port IDs corresponding to the value. value. It can be understood that the DMRS indicator information is used to indicate one or more DMRS port IDs, or is used to specify one or more DMRS port IDs and a CDM group without data.

In an exemplary implementation, when the DMRS indicator information is used to indicate one or more DMRS port IDs, the DMRS indicator information may be used to distinguish between the SDM mode and the FDM mode. Thus, due to the physical layer processing characteristics of the SDM mode and the FDM mode, the two modes differ in one or more DMRS port IDs. Based on the physical layer processing procedure, at least two DMRS ports are used for SDM transmission, and the DMRS ports belong to different CDM groups; and one or more DMRS ports are used for transmission in the FDM mode, and transmission is limited to the execution of the procedure in the case where the maximum rank (rank) is 2. Thus, the SDM mode and the FDM mode are distinguished by one or more DMRS port IDs.

In an exemplary implementation, when the DMRS indicator information is used to indicate one or more DMRS port IDs and a CDM group without data, the DMRS indicator information may be used to distinguish between the SDM mode, the FDM mode, and the first TDM mode. Thus, the transmission mode corresponding to each value in Table 1 can be determined.

The network device may configure the retransmission indicator information for the terminal device and send the retransmission indicator information to the terminal device. The network device may send retransmission indicator information to the terminal device using higher layer signaling. The higher layer signaling may be, for example, radio resource control (RRC) signaling, that is, the retransmission indicator information is transmitted in RRC signaling.

In an exemplary implementation, the retransmission indicator information may be used to indicate a time domain retransmission parameter. Method 1: The time domain retransmission parameter is used to indicate the number of repetitions in the time domain, and may be an aggregation factor (AggregationFactor). The AggregationFactor may be used to distinguish TDM from other transmission modes. Method 2: The time domain retransmission parameter may be a PDSCH aggregation factor (pdsch-AggregationFactor), and the value of pdsch-AggregationFactor may be 2, 4, or 8. It indicates that retransmission is performed in consecutive pdsch-AggregationFactor slots. The pdsch-AggregationFactor parameter may be used to distinguish the second TDM mode from other transmission modes. Alternatively, the retransmission indicator information is further used to indicate a frequency domain retransmission parameter, and the frequency domain retransmission parameter is used to distinguish between the first FDM mode and the second FDM mode.

In an exemplary implementation, the retransmission indicator information may be used to indicate a first time domain retransmission parameter and a second time domain retransmission parameter. The first time domain retransmission parameter may be represented as a mini-slot aggregation factor (MiniSlotAggregationFactor), and the second time domain retransmission parameter may be represented as a slot aggregation factor (SlotAggregationFactor). The first time domain retransmission parameter and the second time domain retransmission parameter may be used to distinguish between the TDM mode and other transmission modes, and may be used to distinguish between the first TDM mode and the second TDM mode after the transmission mode is determined to be the TDM mode.

In an exemplary implementation, the retransmission indicator information may be used to indicate a frequency domain retransmission parameter, a first time domain retransmission parameter, and a second time domain retransmission parameter. In this case, the retransmission indicator information may be represented as {a, b, c}. For example, a is a frequency domain retransmission parameter, b is a first time domain retransmission parameter, and c is a second time domain retransmission parameter. Thus, the terminal apparatus can determine the transmission mode based on the retransmission indicator information and the number of CDM groups.

The network device may configure the TCI information for the terminal device and send the TCI information to the terminal device. The network device may send the DMRS indicator information to the terminal device using dynamic control signaling, and the DCI may be dynamic control signaling. In other words, the DMRS pointer information may be carried in the DCI. After the network device configures the TCI information and the DMRS pointer information for the terminal device, the network device may send the TCI information and the DMRS pointer information to the terminal device using the same DCI, or may send the TCI information and the DMRS pointer information to the terminal device, using different DCI.

The TCI information is used to indicate the state of the TCI during transmission. The TCI information may be a TCI codepoint, and one TCI codepoint corresponds to one or more TCI states. In the case of multicast transmission, one TCI code point may indicate two or more TCI states. If the TCI information indicates two or more TCI states, the terminal apparatus may determine that the current transmission scenario is a multi-station transmission scenario.

Step 602: The terminal device determines the transmission mode based on the configuration indicator information.

Before determining the transmission mode based on the configuration indicator information, the terminal apparatus may first determine whether the current transmission scenario is a multi-station transmission scenario. After determining that the current transmission scenario is a multi-station transmission scenario, the terminal apparatus determines the transmission mode based on the configuration indicator information.

Specifically, the terminal device can determine, based on the number of TCI states indicated by the TCI information, whether the current transmission scenario is a multi-station transmission scenario. If the number of TCI states is greater than or equal to 2, the terminal apparatus may determine that the current transmission scenario is a multi-station transmission scenario. The terminal apparatus may determine, based on the received QCL, whether the current transmission scenario is a multi-station transmission scenario. If a plurality of different QCLs are received, the terminal apparatus may determine that the current transmission scenario is a multi-station transmission scenario.

The terminal device obtains the configuration indicator information and determines the transmission mode based on the received configuration indicator information. That the terminal device determines the transmission mode based on various configuration indicator information is described below using the following several embodiments.

In Embodiment 1, the configuration indicator information is retransmission indicator information.

The retransmission indicator information may be used to indicate the time domain retransmission parameter, or may be used to indicate the first time domain retransmission parameter and the second time domain retransmission parameter, or may be used to indicate the frequency domain retransmission parameter, the first parameter retransmission in the time domain; and a second retransmission parameter in the time domain.

For the case where the retransmission indicator information is used to indicate the time domain retransmission parameter:

Method 1: The time domain retransmission parameter is used to indicate the number of repetitions in the time domain, and may be an AggregationFactor. After the terminal device determines that the current transmission scenario is a multi-station transmission scenario, if the terminal device has received the time domain retransmission parameter, it indicates that the network device has configured the time domain retransmission parameter for the terminal device. In this case, the terminal apparatus may determine that the transmission mode is the TDM mode. If the terminal device has not received the time domain retransmission parameter, this indicates that the network device has not configured the time domain retransmission parameter for the terminal device. In this case, the terminal device may determine that the transmission mode is the SDM mode, the FDM mode, or the combined mode of the SDM mode and the FDM mode. When the terminal device has not received the time domain retransmission parameter, the terminal device can distinguish between the SDM mode and the FDM mode based on the DMRS indicator information used to indicate one or more DMRS port IDs presented in Embodiment 2.

Method 2: The time domain retransmission parameter may be a pdsch-AggregationFactor indicating that the transmission is performed in consecutive slots of the pdsch-AggregationFactor. For example, if pdsch-AggregationFactor is 4, retransmission is performed in four consecutive slots. When the terminal device determines that the current transmission scenario is a multistation transmission scenario and the terminal device has received the time domain retransmission parameter, the terminal device can determine that the transmission mode is the second TDM mode, that is, the inter-slot block TDM mode. If the terminal device has not received the time domain retransmission parameter, the terminal device may determine that the transmission mode is one or more of the first TDM mode, SDM mode, or FDM mode. When the terminal device has not received the time domain retransmission parameter, the terminal device can distinguish between the first TDM mode, the SDM mode, and the FDM mode based on the DMRS indicator information used to indicate one or more DMRS port IDs and the number of CDM groups without data in option 3 implementation.

As for Method 1, after determining that the transmission mode is TDM mode, the terminal apparatus may further determine whether the TDM mode is the first TDM mode or the second TDM mode.

In an exemplary implementation, if the time domain retransmission parameter is the first time domain retransmission parameter, it can be determined that the time division multiplexing mode is the first time division multiplexing mode; or, if the time domain retransmission parameter is the second time domain retransmission parameter, it can be determined that the time division multiplexing mode is the second time division multiplexing mode. For example, the first time domain retransmission parameter may be represented as MiniSlotAggregationFactor and the second time domain retransmission parameter may be represented as SlotAggregationFactor.

In an exemplary implementation for the first TDM mode, the time domain retransmission parameter may include a specific first TDM mode parameter, and it is further determined that the transmission mode is the first TDM mode. For example, if the time domain retransmission parameter includes offset information, it can be determined that the transmission mode is the first TDM mode; or, if the time domain retransmission parameter does not include offset information, it may be determined that the transmission mode is the second TDM mode. The offset information may indicate offset information of locations in the time domain of the plurality of PDSCHs.

In an exemplary implementation, the time domain retransmission parameter represents the number of transmission repetitions, but does not indicate whether the transmission repetition number is the number of transmission repetitions in a slot or the number of transmission repetitions between slots. This may determine the terminal device based on other information. For example, the other information is a flag bit in RRC signaling carrying retransmission indicator information. For example, if the bit is set to "0", indicating that the number of transmission repetitions is the number of transmission repetitions within a slot, the terminal apparatus may determine that the transmission mode is the first TDM mode; or, if the bit is set to "1", indicating that the number of transmission repetitions is the number of transmission repetitions between slots, the terminal device may further indicate that the transmission mode is the second TDM mode. In another example, if the bit is set to "0", indicating that the number of transmission repetitions is the number of transmission repetitions between slots, the terminal device may determine that the transmission mode is the second TDM mode; or, if the bit is set to "1", indicating that the number of transmission repetitions is the number of transmission repetitions within the slot, the terminal apparatus may determine that the transmission mode is the first TDM mode. For example, the other information is the RRC {mini-slot, slot} additional signaling, and the RRC additional signaling is another part of the RRC signaling that is different from the RRC signaling carrying the retransmission pointer information. Additional signaling RRC {mini-slot, slot} indicates whether the number of transmission repetitions is the number of transmission repetitions within a slot or the number of transmission repetitions between slots. For example, if {1, 0} indicates that the number of transmission repetitions is the number of transmission repetitions in the slot, the terminal apparatus may determine that the transmission mode is the first TDM mode; or, if {0, 1} indicates that the number of transmission repetitions is the number of transmission repetitions between slots, the terminal apparatus may determine that the transmission mode is the second TDM mode. In another example, if {1, 0} indicates that the number of transmission repetitions is the number of transmission repetitions between slots, the terminal device may determine that the transmission mode is the second TDM mode; or, if {0, 1} indicates that the number of transmission repetitions is the number of transmission repetitions in the slot, the terminal apparatus may determine that the transmission mode is the first TDM mode. For the case where retransmission indicator information is used to indicate the first time domain retransmission parameter and the second time domain retransmission parameter, and the following conditions are used.

When the terminal device determines that the current transmission scenario is a multi-station transmission scenario, if the terminal device has not received the first time domain retransmission parameter and the second time domain retransmission parameter, that is, the network device has not configured the first time domain retransmission parameter, and the second time domain retransmission parameter for the terminal device, the terminal device may determine that the transmission mode is the SDM mode, the FDM mode, or the combined mode of the SDM mode and the FDM mode. If the terminal device has received the first time domain retransmission parameter and the second time domain retransmission parameter, but the value of the first time domain retransmission parameter and the value of the second time domain retransmission parameter are both equal to the first predetermined value, the terminal device may determine that the transmission mode is the SDM mode, the FDM mode, or the combined mode of the SDM mode and the FDM mode. If the terminal device has received the first time domain retransmission parameter and the second time domain retransmission parameter, and one or both of the value of the first time domain retransmission parameter and the value of the second time domain retransmission parameter, the transmission parameter is greater than the first predetermined value, the terminal device may determine that the transmission mode is the TDM mode.

After determining that the transmission mode is the TDM mode, the terminal apparatus may further determine whether the TDM mode is the first TDM mode or the second TDM mode. If the value of the first time domain retransmission parameter is equal to the first predetermined value, and the value of the second time domain retransmission parameter is greater than the first predetermined value, it can be determined that the time division multiplexing mode is the second TDM mode; if the value of the second time domain retransmission parameter is equal to the first predetermined value, and the value of the first time domain retransmission parameter is greater than the first predetermined value, it is determined that the time division multiplexing mode is the first TDM mode; or, if the values of both the first time domain retransmission parameter and the second time domain retransmission parameter are greater than the first predetermined value, it is determined that the time division multiplexing mode is the combined mode of the first TDM mode and the second TDM mode. The first set value can be 1.

The case in which retransmission pointer information is used to indicate the first time domain retransmission parameter and the second time domain retransmission parameter can be represented using the following Table 2. Table 2 shows an example in which the first set value is 1, the first time domain retransmission parameter is represented by MiniSlotAggregationFactor, and the second time domain retransmission parameter is represented by SlotAggregationFactor.

table 2

MiniSlotAggregationFactor SlotAggregationFactor Transfer mode Not configured Not configured SDM mode or FDM mode =1 =1 SDM mode or FDM mode >1 =1 First TDM mode =1 >1 Second TDM mode >1 >1 First TDM Mode + Second TDM Mode

"Not configured" in Table 2 indicates that the network device has not configured the first time domain retransmission parameter and the second time domain retransmission parameter for the terminal device, and the terminal device has not received the first time domain retransmission parameter and the second time domain retransmission parameter. transmissions in the time domain. The specific value ">1" in Table 2 may indicate the number of repetitions. For example, if MiniSlotAggregationFactor is 4, this indicates that retransmission is performed four times in one slot. In another example, if the SlotAggregationFactor is 4, this indicates that the retransmission is performed in four consecutive slots.

Alternatively, the first time domain retransmission parameter and the second time domain retransmission parameter may be represented as {x, y}. For example, x is the first retransmission parameter in the time domain, i.e., the number of retransmissions in the slot; and y is the second time domain retransmission parameter, that is, retransmission performed in y consecutive slots. If x>1 and y=1, the terminal device may determine that the transmission mode is the first TDM transmission mode; or, if x=1 and y>1, the terminal device may determine that the transmission mode is the second TDM transmission mode.

For the case where retransmission indicator information is used to indicate a frequency domain retransmission parameter, a first time domain retransmission parameter, and a second time domain retransmission parameter:

The retransmission pointer information may be represented as {a, b, c}. For example, a is a frequency domain retransmission parameter, that is, the number of frequency domain transmission repetitions; b is the first time domain retransmission parameter, that is, the number of transmission repetitions in a slot in the time domain; and c is the second time domain retransmission parameter, that is, the number of transmission repetitions between slots in the time domain. If there is no retransmission in the time domain or in the frequency domain, each value of a, b, and c may be 0 or 1. In this embodiment of the present application, 1 is used as an example.

When the terminal apparatus determines that the current transmission scenario is a multi-station transmission scenario, if the retransmission indicator information is {x, 1, 1}, where x is an integer greater than 1, such as x=2, the terminal apparatus may determine that the transmission mode is the second FDM mode. For example, if the retransmission indicator information is {1, 1, x}, the terminal apparatus may determine that the transmission mode is the second TDM mode. For example, if the retransmission indicator information is {1, x, 1}, the terminal apparatus may determine that the transmission mode is the first TDM mode.

During implementation of Embodiment 1 provided in the present application, the terminal device determines, based on the received retransmission indicator information, that the transmission mode is TDM mode, and no additional indicator information is required for the indication.

In Embodiment 2, the configuration indicator information is DMRS indicator information, and the DMRS indicator information may be used to indicate one or more DMRS port IDs.

When the terminal device determines that the current transmission scenario is a multi-station transmission scenario, the terminal device that has obtained the DMRS indicator information determines one or more DMRS port IDs based on the DMRS indicator information, that is, can search the DMRS table for one or more DMRS port IDs based on the specified value, and determines the transmission mode based on one or more DMRS port IDs. In this case, the terminal apparatus determines, based on one or more DMRS port IDs, whether the transmission mode is the FDM mode or the SDM mode.

The terminal device may determine the transmission mode based on one or more DMRS port IDs in the following four ways.

Method 1: If the number of CDM groups corresponding to one or more DMRS port IDs is equal to the second predetermined value, the terminal device can determine that the transmission mode is the FDM mode. If the number of CDM groups corresponding to one or more DMRS port IDs is equal to the third predetermined value, the terminal device can determine that the transmission mode is the SDM mode. The second set value may be 1, which corresponds to one CDM group. The third predetermined value may be 2, which corresponds to two CDM groups. For example, in Table 1, when the value is 9, the DMRS port IDs are [0, 1, 2] and correspond to two CDM groups, namely CDM group {0} and CDM group {1}. In this case, the terminal apparatus may determine that the transmission mode is the SDM mode. Similarly, when the value is 10 or 11, the terminal device may determine that the transmission mode is the SDM mode. As another example, in Table 1, when the value is 7, the DMRS port IDs are [0, 1] and correspond to one CDM group, namely the CDM group {0}. In this case, the terminal apparatus may determine that the transmission mode is the FDM mode.

Method 2: If one or more DMRS port IDs belong to the same CDM group, the terminal device can determine that the transmission mode is the FDM mode; or, if one or more DMRS port IDs do not belong to the same CDM group, the terminal device may determine that the transmission mode is the SDM mode. For example, in Table 1, when the value is 7, the DMRS port IDs are [0, 1] and belong to the same CDM group, namely the {0} CDM group. In this case, the terminal apparatus may determine that the transmission mode is the FDM mode. As another example, in Table 1, when the value is 9, the DMRS port IDs are [0, 1, 2] and belong to two CDM groups. In this case, the terminal apparatus may determine that the transmission mode is the SDM mode.

Method 3: If the number of one or more DMRS port IDs is equal to the second predetermined value, the terminal apparatus may determine that the transmission mode is the FDM mode; or, if the number of one or more DMRS port IDs is not equal to the second predetermined value, the terminal apparatus may determine that the transmission mode is the SDM mode. The second set value may be 1. For example, in table 1, when the value is 4, there is one DMRS port ID. In this case, the terminal apparatus may determine that the transmission mode is the FDM mode. As another example, in Table 1, when the value is 9, there are three DMRS port IDs. In this case, the terminal apparatus may determine that the transmission mode is the SDM mode.

Method 4: If one or more DMRS port IDs are predetermined IDs, the terminal device can determine that the transmission mode is the FDM mode; or, if one or more DMRS port IDs are not predetermined IDs, the terminal device may determine that the transmission mode is the SDM mode. The given identifier can take the values [0], [1] or [0, 1]. For example, in table 1, when the value is 1, 2, or 7, the DMRS port IDs are the given IDs. In this case, the terminal apparatus may determine that the transmission mode is the FDM mode. As another example, in Table 1, when the value is 9, 10, or 11, the DMRS port IDs further include another ID in addition to the given IDs. In this case, the terminal apparatus may determine that the transmission mode is the SDM mode.

The above four methods for determining the transmission mode based on one or more DMRS port IDs are used as examples and do not limit the embodiments of the present application.

In another exemplary implementation, the terminal device determines the number of CDM groups based on the DMRS indicator information, and determines the transmission mode based on the number of CDM groups. If the number of CDM groups is equal to the second predetermined value (eg, there is one CDM group), the terminal apparatus may determine that the transmission mode is the FDM mode; or, if the number of CDM groups is equal to the third predetermined value (eg, there are two CDM groups), the terminal device may determine that the transmission mode is the SDM mode. The difference between this method and the previous method 1 is that in the previous method 1, one or more DMRS port IDs are determined based on the value, and the number of CDM groups is determined based on the port ID, but in this method, the number of CDM groups is determined directly based on values.

After determining that the transmission mode is the FDM mode, the terminal apparatus may further determine whether the FDM mode is the first FDM mode or the second FDM mode. The terminal device receives the retransmission parameter in the frequency domain. If the terminal device has received the frequency domain retransmission parameter, the terminal device may determine that the transmission mode is the second FDM mode; or, if the terminal device has not received the frequency domain retransmission parameter, the terminal device may determine that the transmission mode is the first FDM mode. The frequency domain retransmission parameter and the time domain retransmission parameter may be transmitted together in RRC signaling. In other words, the retransmission indicator information carried in the RRC signaling may indicate a time domain retransmission parameter and a frequency domain retransmission parameter; or, the retransmission indicator information carried in the RRC signaling indicates a time domain retransmission parameter, and other information in the RRC signaling indicates a frequency domain retransmission parameter. Alternatively, the frequency domain retransmission parameter may be indicated using additional RRC signaling. For example, RRC signaling 1 indicates a time domain retransmission parameter and RRC signaling 2 indicates a frequency domain retransmission parameter.

It can be understood that in Embodiment 2, when DMRS is used to indicate one or more DMRS port IDs, the terminal device determines the transmission mode based on the third column in Table 1.

In Embodiment 3, the configuration indicator information is DMRS indicator information, and the DMRS indicator information is used to indicate one or more DMRS port IDs and the number of CDM groups without data.

The terminal device determines, based on the number of CDM groups corresponding to one or more DMRS port IDs and the number of CDM groups without data, that the transmission mode is a space division multiplexing mode, a frequency division multiplexing mode, or a first time division multiplexing mode. channel separation. If the terminal device has determined that the transmission mode is a frequency division multiplexing mode, then the terminal device determines, based on the CDM group group ID corresponding to one or more DMRS port IDs, that the transmission mode is the first frequency division multiplexing mode or the second frequency division multiplexing mode.

For example, if there are two CDM groups corresponding to one or more DMRS port IDs, the terminal device may determine that the transmission mode is the SDM mode; or, if there is one CDM group corresponding to one or more DMRS port IDs, and there is one CDM group with no data, the terminal device may determine that the transmission mode is the first TDM mode; or, if there is one CDM group corresponding to one or more DMRS port IDs, and there are two CDM groups with no data, the terminal apparatus may determine that the transmission mode is the FDM mode. After it is determined that the transmission mode is the FDM mode, if the CDM group group ID corresponding to one or more DMRS port IDs is the first ID, the terminal device can determine that the transmission mode is the first FDM mode; or, if the CDM Group Group ID corresponding to one or more DMRS Port IDs is the second ID, the terminal device can determine that the transmission mode is the second FDM mode. For example, if the CDM group group ID is {0}, the terminal device determines that the transmission mode is the first FDM mode; or, if the CDM group group ID is {1}, the terminal apparatus determines that the transmission mode is the second FDM mode. In another example, if the CDM Group Group ID is {1}, the terminal device determines that the transmission mode is the first FDM mode; or, if the CDM group group ID is {0}, the terminal device determines that the transmission mode is the second FDM mode.

Based on the above examples, the transmission mode corresponding to each value in Table 1 can be determined. See Table 3 below for details.

Table 3

Meaning
(value) Number of CDM groups without data DMRS port Transfer mode 0 1 0 First TDM mode 1 1 1 First TDM mode 2 1 0, 1 First TDM mode 3 2 0 First FDM Mode 4 2 1 First FDM Mode 5 2 2 Second FDM mode 6 2 3 Second FDM mode 7 2 0, 1 First FDM Mode 8 2 2, 3 Second FDM mode 9 2 0-2 SDM mode 10 2 0-3 SDM mode eleven 2 0.2 SDM mode 12-15 Reserved Reserved

In Table 3, if the CDM group group ID is {0}, the corresponding transmission mode is the first FDM mode; or, if the CDM Group ID is {1}, the corresponding transmission mode is the second FDM mode. In Table 3, each transmission mode has a corresponding entry in the DMRS table. For example, the first TDM mode, the first FDM mode, the second FDM mode, and the SDM mode can be distinguished using four entries {2, 7, 8, 11}.

Based on Table 3, if the transmission mode used by the network device is the SDM mode, the network device can configure the index (index) of the DMRS table whose DMRS type is 1 and which has one character as one of 9, 10, or 11, that is the DMRS indicator information is used to indicate the value 9 in Table 3 to implicitly notify the terminal device that the current transmission mode is the SDM mode. In another example, if the transmission mode used by the network device is the first FDM mode, the network device may configure the DMRS table index as one of {3, 4, 7} to implicitly notify the terminal device that the current transmission mode is the first mode. FDM.

It can be understood that in Embodiment 3, when DMRS is used to indicate one or more DMRS port IDs and the number of CDM groups without data, the terminal device determines the transmission mode based on the second column and the third column in Table 1.

During implementation of Embodiment 2 and Embodiment 3, which are provided in the present application, the terminal device distinguishes between SDM mode and FDM mode based on the received DMRS indicator information, and no additional indicator information is required for indication.

Option 3-1 Implementation

In Embodiment 3-1, a combination of one or more of: DMRS port IDs, CDM group group ID, number of CDM groups, no data CDM group group ID, or no data CDM group number is used to distinguish between different transmission modes. The group identifier for a CDM group in this specification may indicate a CDM group with data, and may be different from a CDM group without data. As described above, the transmission modes are classified into a space division multiplexing mode, a frequency division multiplexing mode, a time division multiplexing mode, and the like, which are referred to as different transmission modes in this description. In addition, each transmission mode may be further divided into sub-modes. For example, a frequency division multiplexing mode can be classified into a first frequency division multiplexing mode and a second frequency division multiplexing mode, and a time division multiplexing mode can be classified into a first time division multiplexing mode and a second multiplexing mode. time division channels, which in this description are referred to as different submodes of the same transmission mode.

Different transmission modes or different sub-modes of the same transmission mode may be distinguished in this embodiment according to one of the following rules or a combination of more than two rules:

(1) Different DMRS port IDs correspond to different transmission modes or correspond to different submodes of the same transmission mode.

(2) Different CDM group IDs correspond to different transmission modes or correspond to different sub-modes of the same transmission mode. The CDM Group Group ID may be specified directly, or may be obtained indirectly using DMRS Port IDs belonging to different CDM groups.

(3) Different number of CDM groups correspond to different transmission modes or correspond to different sub-modes of the same transmission mode. The number of CDM groups may be specified directly, or may be obtained indirectly using the DMRS port IDs belonging to different CDM groups.

(4) A different number of CDM groups without data corresponds to different transmission modes or corresponds to different sub-modes of the same transmission mode.

(5) Different CDM group IDs without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

A combination of the above rules can be:

(6) Different combinations of the CDM group ID and the number of CDM groups without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

(7) Different combinations of CDM Group ID and CDM Group ID without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

(8) Different combinations of the number of CDM groups and the number of CDM groups without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

(9) Different combinations of the number of CDM groups and the CDM group ID without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

(10) Different combinations of the number of CDM groups and one or more DMRS port IDs correspond to different transmission modes or correspond to different submodes of the same transmission mode.

(11) Different combinations of a CDM group ID and one or more DMRS port IDs correspond to different transmission modes or correspond to different submodes of the same transmission mode.

(12) Different combinations of the number of CDM groups and the CDM group ID correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

(13) Different combinations of CDM Group ID and CDM Group ID without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

(14) Different combinations of the CDM group group ID and the number of CDM groups without data correspond to different transmission modes or correspond to different sub-modes of the same transmission mode.

The above combinations are just examples. There may be another combination that can be used to distinguish between different transmission modes or different sub-modes corresponding to the same transmission mode. One or more DMRS port IDs, a CDM group group ID, a CDM group number, a blank CDM group ID, and a blank CDM group number may be directly or indirectly indicated using DMRS pointer information. In other words, as long as an indication can be given, one or more DMRS port IDs, CDM group group ID, number of CDM groups, CDM group ID without data, and number of CDM groups without data can be referred to as DMRS indicator information. Direct indication means that the parameter is indicated directly using the DMRS pointer information. An indirect specification means that a parameter can be obtained using another parameter. For example, the DMRS indicator information indicates one or more DMRS port IDs, and the CDM group group ID or the number of CDM groups can be obtained based on the one or more DMRS port IDs.

In an implementation, the DMRS pointer information is specified using an entry in the DMRS table. A DMRS table entry may also be referred to herein as an index or value of a DMRS table.

Thus, in this embodiment, it can be further used that the DMRS indicator information corresponds to different values, different transmission modes, or different sub-modes of the same transmission mode. Alternatively, a combination of one or more of different values corresponding to the DMRS indicator information, one or more DMRS port IDs, a CDM group group ID, a number of CDM groups, a CDM group ID without data, or a number of CDM group without data, may correspond to different transmission modes or correspond to different submodes of the same transmission mode.

Some reserved values in the values corresponding to the DMRS pointer information are not normally used to indicate the corresponding DMRS Port ID, CDM Group ID, CDM Group Count, Blank CDM Group ID, and Blank CDM Group Count, but may be used in the future. Reserved values that are not currently used but may be used in the future and some values that may be added in the future that are used to indicate DMRS configuration information are referred to as setpoints in this embodiment.

The terminal device determines, based on one or more of: DMRS port IDs, CDM group group ID, number of CDM groups, number of CDM groups corresponding to one or more DMRS port IDs, CDM group ID corresponding to one or more DMRS port IDs, and number of CDM groups without data, that the transmission mode is one or more of: a space division multiplexing mode, a first frequency division multiplexing mode, a second frequency division multiplexing mode, a first time division multiplexing mode, or a second mode where one or more DMRS port IDs, a CDM group group ID, a number of CDM groups, a number of CDM groups corresponding to one or more DMRS port IDs, a CDM group ID corresponding to one or more DMRS port IDs, and a number of groups CDMs without data are indicated in the DMRS pointer information.

With reference to specific implementations, the following describes how to distinguish between different transmission modes or how to distinguish between different sub-modes of the same transmission mode in accordance with rules (1)-(5) in the above examples. It should be noted that not all possible implementations are listed in this embodiment, and a person skilled in the art can obtain an equivalent implementation in accordance with the rules and listed implementations described in this specification.

For rule (3), a different number of CDM groups or a different number of CDM groups corresponding to one or more DMRS port IDs correspond to different transmission modes.

If there are two CDM groups corresponding to one or more DMRS port IDs, the corresponding default transmission mode is SDM. For example, in Table 3-1, the DMRS port IDs corresponding to values 9, 10, and 11 are [0-2], [0-3], and [0, 2], respectively. As described above, DMRS port [0] and DMRS port [1] belong to CDM group {0}, DMRS port [2] and DMRS port [3] belong to CDM group {1}, and the three DMRS port ID groups belong to CDM group {0} and CDM group {1}, that is, correspond to two CDM groups. The network device may send DMRS indicator information to the terminal device based on the correspondence between the number of 2 CDM groups and the transmission mode being the SDM mode, that is, one or more of 9, 10 and 11, to indicate the SDM mode to the terminal device. Upon receiving one or more of 9, 10, and 11, the terminal device may determine that the current transmission mode is the SDM mode.

In this document, the fact that the number of CDM groups equal to 2 corresponds to the SDM mode is used only as an example. That the number of CDM groups is 2 may alternatively indicate another transmission mode, such as the eMBB mode. Thus, for the values (values 9, 10, and 11 in Table 3-1) corresponding to the SDM mode/eMBB mode, since the two transmission modes have the same physical procedure, the network device can configure the value in the DMRS configuration information table as one of {9, 10, 11} to implicitly notify the terminal device that the current transmission mode is the uRLLC multistation SDM transmission mode or the eMBB multistation transmission mode.

If one or more DMRS port IDs correspond to one CDM group, the corresponding default transmission mode is a non-SDM mode. Any one rule or combination of rule (8), rule (9), rule (10), and rule (12) can be used to distinguish between different transmission modes or different sub-modes of the same transmission mode. An example is shown below.

There is one CDM group, and the first frequency division multiplexing mode, the second frequency division multiplexing mode, the first time division multiplexing mode, and the second time division multiplexing mode may be different from each other based on a combination of one or more of the following parameters: one or more DMRS port IDs, a CDM group group ID corresponding to one or more DMRS port IDs, and the number of CDM groups without data. It should be noted that in this case, the above four transmission modes are basically the same. Specifically, if there are N different parameter combinations, the above four transmission modes may correspond to any of the parameter combinations. This is not limited in the present application.

For example, when there is one CDM group, the first frequency division multiplexing mode, the second frequency division multiplexing mode, the first time division multiplexing mode, and the second time division multiplexing mode are different from each other based on the combination of the group group identifier CDM and number of CDM groups without data. For table 1, that is, the DMRS table, which has type DMRS=1 and which has one character in the current version (Release) 15, there are two values {1, 2} of the number of CDM groups without data, and there are two values {0, 1 } of the CDM group group identifier corresponding to one or more DMRS port identifiers, then there is a DMRS port [0] and a DMRS port [1] belong to the CDM group {0}, and a DMRS port [2] and a DMRS port [3] belong to the group {1}CDM. In Table 1, there are three combinations [1 0], [2 0], and [2 1] between the number of CDM groups with no data and the CDM group ID to which one or more DMRS port IDs belong. In this case, it is equivalent that the four transmission modes can correspond to any of the three combinations. The remaining transfer mode needs to be identified by an additional parameter or set value (eg, a reserved value or a value that can be added).

Based on the above examples, the transmission mode corresponding to each value in Table 1 can be determined. Refer to the following Table 3-1 for details. For Table 1, there are C ³ ₄ A ³ ₃ =24 cases of selection of the above four transmission modes. Only four cases are given as examples in the following table.

Table 3-1

value Number of CDM groups without data DMRS port Transfer Mode Scenario 1 Scenario 2 transmission mode 0 1 0 First/second TDM mode First/second FDM mode 1 1 1 First/second TDM mode First/second FDM mode 2 1 0, 1 First/second TDM mode First/second FDM mode 3 2 0 First FDM Mode First TDM mode 4 2 1 First FDM Mode First TDM mode 5 2 2 Second FDM mode Second TDM mode 6 2 3 Second FDM mode Second TDM mode 7 2 0, 1 First FDM Mode First TDM mode 8 2 2, 3 Second FDM mode Second TDM mode 9 2 0-2 SDM/eMBB mode SDM/eMBB mode 10 2 0-3 SDM/eMBB mode SDM/eMBB mode eleven 2 0.2 SDM/eMBB mode SDM/eMBB mode 12-15 Reserved Reserved (Optional) (Optional)

Table 3-1 (continued)

value Number of CDM groups without data DMRS port Transfer mode
scenario 3 Transfer mode
scenario 4 0 1 0 First FDM Mode 1 1 1 First FDM Mode 2 1 0, 1 First FDM Mode 3 2 0 Second FDM mode First/second FDM mode 4 2 1 Second FDM mode First/second FDM mode 5 2 2 First/second TDM mode First/second TDM mode 6 2 3 First/second TDM mode First/second TDM mode 7 2 0, 1 Second FDM mode First/second FDM mode 8 2 2, 3 First/second TDM mode First/second TDM mode 9 2 0-2 SDM/eMBB mode SDM/eMBB mode 10 2 0-3 SDM/eMBB mode SDM/eMBB mode eleven 2 0.2 SDM/eMBB mode SDM/eMBB mode 12-15 Reserved Reserved (Optional) (Optional)

The contents of Table 3-1 are described below.

1. One or more of the same transmission modes may correspond to different values in the DMRS table. One transmission mode corresponds to different values in the DMRS table (eg, the values in scenario 1 of the transmission mode are 3, 4, and 7). In other words, different values in the DMRS table may correspond to the same transmission mode. In this case, the network device may indicate to the terminal device that the value of the DMRS table whose DMRS type is 1 and which has one character is at least one of {3, 4, 7}, for example, indicate the value 3, the value 4, or the value 7 in Table 3-1, or specify the value 3 and value 4, specify the value 4 and value 7, or specify the value 3 and value 7, or specify the value 3, value 4 and value 7, to implicitly notify the terminal device that the current transmission mode is the first FDM mode. The present application does not limit that all of the above entries indicate the transmission modes shown in Table 3-1, and the above values are reserved for another transmission mode, such as a single-station transmission mode.

2. For the case where a plurality of DMRS pointer information pieces correspond to a plurality of the same transmission modes, for example, the values {0, 1, 2} in transmission mode scenario 1, since the number of values in the DMRS table is limited, the above values correspond to the first TDM mode, or second TDM mode. In this case, the transfer mode can be further identified in the following ways:

(1) An additional parameter DMRS is introduced. In this embodiment, different DMRS port identifiers may be used to further differentiate the values. For example, the first DMRS port ID corresponds to the first TDM mode and the second DMRS port ID corresponds to the second TDM mode, that is, the value 0 corresponds to the first TDM mode and the value 1 corresponds to the second TDM mode. Thus, the network device sends the DMRS indicator information, that is, the corresponding value, to the terminal device, so the terminal device can distinguish between the first TDM mode and the second TDM mode based on the received value. For transmission mode scenario 2, the value 0, value 1, and value 2 correspond to the first FDM mode or the second FDM mode. The first FDM mode and the second FDM mode can also be distinguished by using different DMRS port IDs. In this case, the principle is the same as for distinguishing between the first TDM mode and the second TDM mode, and the details will not be described again here.

(2) A different parameter or signaling is used to distinguish. First, RRC signaling can be used to distinguish between different sub-modes of the same transmission mode that need to be distinguished in the previous scenario, for example, the first TDM mode and the second TDM mode, or the first FDM mode and the second FDM mode. For example, the RRC signaling may be TransmissionScheme ENUMERATED {2a, 2b} or TransmissionScheme ENUMERATED {3, 4}. Second, discrimination may alternatively be performed based on whether a particular transmission mode parameter is configured or whether a particular transmission mode action is performed. For example, for the first TDM mode and the second TDM mode, if the RRC signaling is configured to represent the number of repetitions in the time domain (which is similar to pdsch-AggregationFactor in Rel-15), the current transmission mode is the second TDM mode in the case of multiple stations; if the information element (information element, IE RRC) pdsch-TimeDomainAllocationList is configured with an additional parameter, for example, a set of startSymbolAndLengths, or an additional parameter RRC RepetitionTimes is added, the current transmission mode is the first TDM mode. Similarly, for the first FDM mode and the second FDM mode, if a plurality of RVs are configured, or an action related to soft-combining is performed on the terminal device side, or a soft-combining capability is reported, the current transmission mode is the second FDM mode; otherwise, the current transmission mode is the first FDM mode. Other discrimination methods are also described in other embodiments of the present application, and the details are not repeated here.

(3) The set value of the DMRS indicator information is used to appropriately distinguish transmission modes. For example, a reserved value or a newly added value, or even a used value that was used to indicate DMRS configuration information but not used to indicate a transmission mode, is used to distinguish between the remaining transmission modes. For example, in transmission mode scenario 1, one or more reserved values may be used to indicate the first or second TDM mode, so the DMRS table may be used to distinguish between all eMBB multicast modes and all uRLLC multicast modes.

Table 3-1 shows four typical scenarios that use the above specification. The network device distinguishes between the FDM transmission mode and the TDM transmission mode based on the number of CDM groups without data. The number {1} and the number {2} respectively correspond to the FDM mode and the TDM mode. For example, the number {1} corresponds to the TDM mode, and the number {2} corresponds to the FDM mode. This is referred to as transmission mode scenario 1. In another example, the number {1} corresponds to the FDM mode and the number {2} corresponds to the TDM mode. This is recorded as transfer mode scenario 2. In addition, the first FDM mode and the second FDM mode differ depending on the use of a CDM group group ID corresponding to one or more DMRS port IDs. For example, if the DMRS ports corresponding to 3, 4, 5, 6, 7, and 8 respectively are [0], [1], [2], [3], [0, 1] and [2, 3], that is, the group identifiers of the respective CDM groups are {0}, {0}, {1}, {1}, {0}, and {1}, respectively, the corresponding FDM modes are the first FDM mode, the first FDM mode, respectively, a second FDM mode, a second FDM mode, a first FDM mode, and a second FDM mode. In other words, the values 3, 4, 5, 6, 7, and 8 respectively correspond to the first FDM mode, the first FDM mode, the second FDM mode, the second FDM mode, the first FDM mode, and the second FDM mode. Based on this, the network device indicates different values to the terminal device, and the terminal device can distinguish between the first FDM mode and the second FDM mode based on the values. For scenario 2, the values 3, 4, 5, 6, 7, and 8 respectively correspond to the first TDM mode, the first TDM mode, the second TDM mode, the second TDM mode, the first TDM mode, and the second TDM mode. The network device indicates to the terminal device different values for indicating the first TDM mode or the second TDM mode. This is similar to the previous cases and the details are not repeated.

For the case where the value 0, value 1, or value 2 corresponds to the first TDM mode or the second TDM mode (scenario 1), and the number of CDM groups without data is 1, the first TDM mode and the second TDM mode can be distinguished in three ways in description 2 of Table 3 -1. In scenario 2, the first FDM mode or the second FDM mode corresponding to the value 0, the value 1, or the value 2 is the same as the first FDM mode or the second FDM mode in the previous case, and details are not described again.

As shown in Table 3-1 (continued), for Scenario 3, a CDM Group Group ID corresponding to one or more DMRS Port IDs is used to distinguish between FDM mode and TDM mode. That is, the CDM group {0} corresponds to the FDM mode, and the CDM group {1} corresponds to the TDM mode; or CDM group {0} corresponds to TDM mode and CDM group {1} corresponds to FDM mode. In scenario 3, the first FDM mode and the second FDM mode or the first TDM mode and the second TDM mode differ depending on the use of the number of CDM groups without data. For example, five cases in which the DMRS ports corresponding to the values 0, 1, 2, 3, and 4 are [0], [1], [0, 1], [0], and [1] correspond to the group {0} CDM. The {0} CDM group corresponds to the FDM mode. In addition, the number of CDM groups without data corresponding to the values 0, 1 and 2 is {1} and corresponds to the first FDM mode. The number of CDM groups without data corresponding to 3 and 4 is {2} and corresponds to the second FDM mode. The network device sends the corresponding value to the terminal device. For example, if the value is one or more of 0, 1, and 2, the terminal device may determine that the corresponding transmission mode is the first FDM mode; or, if the value is one or more of 3 or 4, the terminal device may determine that the corresponding transmission mode is the second FDM mode.

For Scenario 4, the FDM mode and TDM mode also differ depending on the use of the CDM group group ID corresponding to one or more DMRS port IDs. That is, the CDM group {0} corresponds to the FDM mode, and the CDM group {1} corresponds to the TDM mode; or CDM group {0} corresponds to TDM mode and CDM group {1} corresponds to FDM mode. However, the sub-modes of FDM mode and TDM mode may not need to be distinguished depending on the number of CDM groups without data, that is, both FDM mode and TDM mode may correspond to the number of CDM group {2} without data. Each of the first FDM mode and the second FDM mode can correspond to three values (including the values 3, 4 and 7), each of the first TDM mode and the second TDM mode can correspond to three values (including the values 5, 6 and 8) and vice versa. In this case, the first FDM mode and the second FDM mode or the first TDM mode and the second TDM mode can be distinguished in three ways in description 2 of Table 3-1. In this document, the details are not re-described.

Alternatively, based on this method, for a value (which has a value of 0, 1, or 2 in this table) corresponding to the number of {1} CDM groups without data, only one of the TDM mode or the FDM mode can be allocated. That is, in Table 3-1, the FDM mode may correspond to six values (including the values 0, 1, and 2), and the TDM mode may correspond to three values; or the TDM mode may correspond to six values (including the values 0, 1 and 2), and the FDM mode may correspond to three values. In addition, in the case where the two modes correspond to different numbers of values, a mode in which the set value of the DMRS indicator information corresponds to a relatively small number of values can be used. For example, a reserved value is used, so the number of values corresponding to FDM mode and TDM mode are the same. For example, the FDM mode may correspond to six values (including the values 0, 1, 2, 3, 4, and 7) and the TDM mode may also correspond to six values (including the values 5, 6, 8, 12, 13, and 14) ; or the TDM mode may correspond to six values (including the values 0, 1, 2, 3, 4 and 7), and the FDM mode may also correspond to six values (including the values 5, 6, 8, 12, 13 and 14).

Similarly, the first FDM mode and the second FDM mode or the first TDM mode and the second TDM mode can be distinguished in three ways in description 2 of Table 3-1. In this document, the details are not re-described.

Similarly, when one or more DMRS port IDs correspond to one CDM group, the first frequency division multiplexing mode, the second frequency division multiplexing mode, the first time division multiplexing mode, and the second time division multiplexing mode may differ based on one or more DMRS port IDs and a CDM group group ID corresponding to one or more DMRS port IDs. In other words, for each given CDM group, different DMRS port IDs can be used to indicate different transmission modes.

Table 3-2

value Number of CDM groups without data DMRS port Transfer Mode Scenario 1 Scenario 2 transmission mode 0 1 0 First TDM mode First FDM Mode 1 1 1 First FDM Mode Second FDM mode 2 1 0, 1 First/second TDM mode First/second FDM mode 3 2 0 First TDM mode First FDM Mode 4 2 1 First FDM Mode Second FDM mode 5 2 2 Second TDM mode First TDM mode 6 2 3 Second FDM mode Second TDM mode 7 2 0, 1 First/second TDM mode First/second FDM mode 8 2 2, 3 First/second FDM mode First/second TDM mode 9 2 0-2 SDM/eMBB mode SDM/eMBB mode 10 2 0-3 SDM/eMBB mode SDM/eMBB mode eleven 2 0.2 SDM/eMBB mode SDM/eMBB mode 12-15 Reserved Reserved (Optional) (Optional)

Table 3-2 shows two typical scenarios that use the above specification method. For scenario 1, FDM mode and TDM mode are distinguished by DMRS port IDs, in particular, the 1st DMRS port ID and the 2nd DMRS port ID in each CDM group correspond respectively to TDM mode and FDM mode. In addition, the first FDM mode and the second FDM mode or the first TDM mode and the second TDM mode are different depending on the use of CDM group group IDs corresponding to the DMRS port IDs. For example, DMRS port ID [0] is the first DMRS port ID in CDM group {0} and is used to represent the first TDM mode; the DMRS port ID [1] is the second DMRS port ID in the CDM group {0} and is used to represent the first FDM mode; the DMRS port identifier [2] is the first DMRS port identifier in the CDM group {1} and is used to represent the second TDM mode; and the DMRS Port ID [3] is the second DMRS Port ID in the CDM group {1} and is used to represent the second FDM mode. In this case, the values 0, 1, 3, 4, 5, and 6 respectively correspond to the first TDM mode, the first FDM mode, the first TDM mode, the first FDM mode, the second TDM mode, and the second FDM mode. The network device may indicate the transmission modes of the terminal device by indicating different values to the terminal device. The terminal device may determine transmission modes based on various received values. In this document, that the first DMRS port ID in each CDM group corresponds to the TDM mode, and the second DMRS port ID in each CDM group corresponds to the FDM mode is only an example. Alternatively, the first DMRS port ID in each CDM group may correspond to the FDM mode, and the second DMRS port ID in each CDM group may correspond to the TDM mode.

For scenario 2, the FDM mode and the TDM mode are distinguished by the use of CDM group group IDs corresponding to one or more DMRS port IDs, in particular, CDM group {0} corresponds to FDM mode, and CDM group {1} corresponds to TDM mode. In addition, the first FDM mode and the second FDM mode or the first TDM mode and the second TDM mode differ depending on the use of one or more DMRS port IDs. For example, DMRS port ID [0] belongs to CDM group {0} and is used to represent the first FDM mode; the DMRS port ID [1] belongs to the CDM group {0} and is used to represent the second FDM mode; the DMRS port identifier [2] belongs to the CDM group {1} and is used to represent the first TDM mode; and the DMRS port ID [3] belongs to the CDM group {1} and is used to represent the second TDM mode.

In this case, the values 0, 1, 3, 4, 5, and 6 respectively correspond to the first FDM mode, the second FDM mode, the first FDM mode, the second FDM mode, the first TDM mode, and the second TDM mode. The network device may indicate the transmission modes of the terminal device by indicating different values to the terminal device. The terminal device may determine transmission modes based on various received values. In this document, that the CDM group {0} corresponds to the FDM mode and the CDM group {1} corresponds to the TDM mode is only an example. Alternatively, CDM group {0} may correspond to TDM mode, and CDM group {1} may correspond to FDM mode. That DMRS port ID 0 represents the first FDM mode and DMRS port ID 1 represents the second FDM mode is just an example. Alternatively, DMRS port ID 1 may represent the first FDM mode, and DMRS port ID 0 may represent the second FDM mode. That DMRS port ID 2 represents the first TDM mode and DMRS port ID 3 represents the second TDM mode is just an example. Alternatively, DMRS port identifier 3 may represent the first TDM mode, and DMRS port identifier 2 may represent the second TDM mode.

It can be understood that when the DMRS port IDs corresponding to the value 2, the value 7, and the value 8 represent two transmission modes, three methods in description 2 in Table 3-1 can be used to distinguish, and details will not be repeated here.

In Embodiment 3-1, the terminal device is notified with one or more of: DMRS port IDs, number of CDM groups, CDM group ID, number of CDM groups corresponding to one or more DMRS port IDs, CDM group ID corresponding to one or more DMRS port IDs, and the number of CDM groups without knowing that the transmission mode is one or more of the first frequency division multiplexing mode, the second frequency division multiplexing, the first time division multiplexing mode, or the second time division multiplexing mode channels.

In addition, the rule in this embodiment is also applicable to a DMRS table other than table 1 in the current release (Release) 15 or a new DMRS table that may appear in a later release (Release). The difference is that for a table other than Table 1, the number of combinations of the above various parameters presented in this embodiment may change. However, the network device can still distinguish between the space division multiplexing mode, the first frequency division multiplexing mode, the second frequency division multiplexing mode, the first time division multiplexing mode, and the second time division multiplexing mode in accordance with the above. rule.

For example, for table 3-3, that is, the DMRS table, character type=2, 1 in the current version (Release) 15, the terminal device can still distinguish between the first frequency division multiplexing mode, the second frequency division multiplexing mode multiplexing , a first time division multiplexing mode, and a second time division multiplexing mode based on the combination of the CDM group group ID corresponding to one or more DMRS port IDs and the number of CDM groups without data.

Table 3-3

value Number of CDM groups without data DMRS port Transfer Mode Scenario 1 Transfer Mode Scenario 1 0 1 0 1 1 1 2 1 0, 1 3 2 0 First FDM Mode First FDM Mode 4 2 1 First FDM Mode Second FDM mode 5 2 2 Second FDM mode First TDM mode 6 2 3 Second FDM mode Second TDM mode 7 2 0, 1 First FDM Mode First FDM Mode 8 2 2, 3 Second FDM mode First TDM mode 9 2 0-2 SDM/eMBB mode SDM/eMBB mode 10 2 0-3 SDM/eMBB mode SDM/eMBB mode eleven 3 0 First TDM mode First FDM Mode 12 3 1 First TDM mode Second FDM mode 13 3 2 Second TDM mode First TDM mode 14 3 3 Second TDM mode Second TDM mode 15 3 4 16 3 5 17 3 0, 1 First TDM mode Second FDM mode 18 3 2, 3 Second TDM mode Second TDM mode 19 3 4, 5 20 3 0-2 SDM/eMBB mode SDM/eMBB mode 21 3 3-5 SDM/eMBB mode SDM/eMBB mode 22 3 0-3 SDM/eMBB mode SDM/eMBB mode 23 2 0.2 SDM/eMBB mode SDM/eMBB mode 24-31 Reserved Reserved

For example, Table 3-3 shows two typical scenarios for different transmission modes. For scenario 1, a different number of CDM groups without data is used to distinguish between the FDM mode and the TDM mode, and the number of {2} and {3}, respectively, corresponds to the FDM mode and the TDM mode. In addition, the first FDM mode and the second FDM mode or the first TDM mode and the second TDM mode differ depending on the use of CDM group group IDs {0} and {1} corresponding to one or more DMRS port IDs. As for scenario 2, CDM group group IDs corresponding to one or more DMRS port IDs are used to distinguish between FDM mode and TDM mode. {0} and {1}, respectively, correspond to the FDM and TDM modes. In addition, the first FDM mode and the second FDM mode or the first TDM mode and the second TDM mode differ depending on the use of one or more DMRS port IDs. For Table 3-3, since the number of possible parameter combinations is greater than the number of transmission modes to be distinguished, the network device can distinguish all of the above transmission modes using the DMRS indicator information, and notify the terminal device of the current transmission mode by configuring the corresponding DMRS index.

During implementation of Embodiment 3-1 provided in the present application, DMRS indicator information is used to distinguish between SDM multiple mode, FDM multiple mode, TDM multiple mode, and eMBB multiple mode. The network device can send DMRS indicator information to the terminal device so as to indicate information such as the number of corresponding CDM groups without data and the DMRS port, in other words, the transmission mode can be implicitly specified, and additional indicator information is not required to specify, so it is possible reduce the number of indication overheads.

In all embodiments of the present application, the correspondence between different values and numbers of CDM groups without data and the correspondence between DMRS ports are only examples, and other correspondence may take place. This embodiment of the present application concerns how to use the number of CDM groups without data, one or more DMRS port IDs, the CDM group group ID corresponding to one or more DMRS port IDs, or how the number of CDM groups corresponds to different transmission modes, so the network device indicates the transmission mode to the terminal device, or the terminal device identifies the transmission mode. The value is only used to indicate the number of CDM groups with no data, is an implementation of the correspondence between DMRS ports, and should not impose any restrictions on embodiments of the present application.

In addition, it should be noted that there is no sequence to distinguish between different transmission modes and distinguish between different sub-modes of the same transmission mode. Any case where different transmission modes or different sub-modes of the same transmission mode can be distinguished according to the above rule should fall within the scope of the embodiments of the present application.

In Embodiment 4, the configuration indicator information is TCI information.

After the terminal device determines that the current transmission scenario is a multi-station transmission scenario, if the number of TCI states is equal to the fourth predetermined value, the terminal device may determine that the transmission mode is the FDM mode or the SDM mode; or, if the number of TCI states is greater than the fourth predetermined value, the terminal device may determine that the transmission mode is the TDM mode. The fourth set value may be 2, which corresponds to two TCI states.

In another possible implementation, after the terminal device determines that the current transmission scenario is a multi-station transmission scenario, if the number of TCI states is equal to the fourth predetermined value, the terminal device may determine that the transmission mode is the FDM mode or the SDM mode; or, if the number of TCI states is equal to the fifth predetermined value, the terminal apparatus may determine that the transmission mode is the TDM mode. The fourth set value may be 2, which corresponds to two TCI states. The fifth set value may be 4, which corresponds to four TCI states.

In Embodiment 5, the configuration indicator information is TCI information and retransmission indicator information.

In an exemplary implementation, the retransmission indicator information is used to indicate a time domain retransmission parameter. After the terminal apparatus determines that the current transmission scenario is a multi-station transmission scenario, the terminal apparatus obtains retransmission indicator information and the number of TCI states is greater than or equal to the fourth predetermined value. In this case, the terminal apparatus may determine that the transmission mode is the TDM mode.

In another possible implementation, the retransmission indicator information is used to indicate a first time domain retransmission parameter and a second time domain retransmission parameter. After the terminal apparatus determines that the current transmission scenario is a multi-station transmission scenario, the terminal apparatus obtains retransmission indicator information and the number of TCI states is greater than or equal to the fourth predetermined value. In this case, the terminal apparatus may determine that the transmission mode is the TDM mode. In addition, the terminal device can distinguish between the first TDM mode and the second TDM mode.

During implementation of Embodiment 5 provided in the present application, after receiving TCI information and retransmission indicator information, the terminal device determines the transmission mode without additional indicator information.

In Embodiment 6, the configuration indicator information is retransmission indicator information and DMRS indicator information, and the retransmission indicator information is used to indicate a frequency domain retransmission parameter, a first time domain retransmission parameter, and a second time domain retransmission parameter.

The retransmission pointer information may be represented as {a, b, c}. For example, a is a frequency domain retransmission parameter, that is, the number of frequency domain transmission repetitions; b is the first time domain retransmission parameter, that is, the number of transmission repetitions in a slot in the time domain; and c is the second time domain retransmission parameter, that is, the number of transmission repetitions between slots in the time domain.

In an exemplary implementation, after the terminal device determines that the current transmission scenario is a multi-station transmission scenario, the terminal device may determine the number of CDM groups included in the DMRS indicator information and may distinguish between an SDM mode and another transmission mode based on the number of CDM groups.

Example 1: If the number of CDM groups is 2, and the retransmission indicator information is {1, 1, 1}, the terminal device can determine that the transmission mode is the SDM mode; or, if the number of CDM groups is 2, and the terminal device has not received the retransmission indicator information, the terminal device may determine that the transmission mode is the SDM mode. Example 2: If the number of CDM groups is 1, and the retransmission indicator information is {1, 1, 1}, the terminal device can determine that the transmission mode is the first FDM mode; or, if the number of CDM groups is 1 and the terminal device has not received the retransmission indicator information, the terminal device may determine that the transmission mode is the first FDM mode. Example 3: If the number of CDM groups is 1 and the retransmission indicator information has a value other than {1, 1, 1}, the terminal device can determine that the transmission mode is the second FDM mode or TDM mode.

In an exemplary implementation, after the terminal device determines that the current transmission scenario is a multi-station transmission scenario, the terminal device may determine the number of CDM groups based on the DMRS indicator information, and may determine the transmission mode based on the number of CDM groups, the frequency domain retransmission parameter , a first time domain retransmission parameter, and a second time domain retransmission parameter.

For example, if the number of CDM groups is 2 and the retransmission indicator information is {1, x, 1} or {1, 1, x}, the terminal device can determine that the transmission mode is a combined mode from the TDM mode and the SDM mode. . Specifically, when the retransmission indicator information is {1, x, 1}, the transmission mode is the combined mode from the first TDM mode and the SDM mode; and when the retransmission indicator information is {1, 1, x}, the transmission mode is the combined mode from the second TDM mode and the SDM mode.

For example, if the number of CDM groups is 1 and the retransmission indicator information is {x, y, 1} or {x, 1, z}, the terminal device can determine that the transmission mode is a combined mode from the TDM mode and the FDM mode where x, y, z are integers greater than 1, x represents the number of transmission repetitions in the frequency domain, y represents the number of transmission repetitions within a slot, and z represents the number of transmission repetitions between slots. Specifically, when the retransmission indicator information is {x, y, 1}, the transmission mode is the combined mode from the first TDM mode and the second FDM mode; when the retransmission indicator information is {x, 1, z}, the transmission mode is the combined mode of the second TDM mode and the second FDM mode; and when the retransmission indicator information is {1, y, z}, the transmission mode is the combined mode from the first TDM mode and the second TDM mode.

During implementation of Embodiment 6 provided in the present application, after receiving the DMRS indicator information and the retransmission indicator information, the terminal device determines the transmission mode without additional indicator information.

In the embodiment shown in FIG. 6, when determining that the current transmission scenario is a multi-station transmission scenario, the terminal device determines the transmission mode based on the received configuration indicator information without additional indicator information, so the indication signaling overhead can be reduced.

In FIG. 7 is a flowchart showing another transmission mode determination method according to an embodiment of the present application. The procedure may include, but is not limited to, the following steps.

Step 701: The network device sends the configuration information to the terminal device. Accordingly, the terminal device receives the configuration information from the network device.

The configuration information may be considered as configuration information indicating a uRLLC scenario to distinguish between a multi-station uRLLC scenario and a multi-station eMBB scenario.

In a first possible implementation, the configuration information may be used to indicate that the terminal device may use a bit rate below a given bit rate, or be used to indicate that the terminal device is using a given modulation and coding scheme (MCS) table. The target bit rate may be 120*1024 (Kbps), the target MCS table may be modulation and coding scheme table 3, and the bit rate below 120*1024 (Kbps) is given in MCS table 3. Bit rate target bit rate (target bit rate).

Table 3 MCS can be represented as the following table 4, that is, the following table 4 is table 3 MCS.

Table 4

MCS Index Modulation Order Target bit rate*[1024] 0 2 thirty 1 2 40 2 2 50 3 2 64 4 2 78 5 2 99 6 2 120 7 2 157 8 2 193 9 2 251 10 2 308 eleven 2 379 12 2 449 13 2 526 14 2 602 15 4 340 16 4 378 17 4 434 18 4 490 19 4 553 20 4 616 21 6 438 22 6 466 23 6 517 24 6 567 25 6 616 26 6 666 27 6 719 28 6 772 29 2 Reserved thirty 4 31 6

Table 4 has six bit rates below 120*1024 (Kbps). The network device instructs the terminal device to use MCS table 3 to indicate that the current transmission script is a uRLLC script.

In a first possible implementation, the configuration information may be a newly defined radio network temporary identity (RNTI) or a field in a newly defined DCI. If the terminal device has detected the configuration information, the terminal device may assume that the current transmission scenario is a multi-station uRLLC scenario; or, if the terminal device has not detected the configuration information, the terminal device may assume that the current transmission scenario is an eMBB scenario with multiple stations.

In a second possible implementation, configuration information related to an existing uRLLC scenario with multiple stations, such as a modulation and coding scheme cell radio network temporary identity (MCS-C-TNTI), may be reused as information configuration. If the terminal device has detected the MCS-C-RNTI, the terminal device may assume that the current transmission scenario is a multi-station uRLLC scenario. If the terminal device has not received the MCS-C-RNTI, the terminal device may assume that the current transmission scenario is an eMBB scenario.

In a third possible implementation, the configuration information may be used to directly indicate that the current transmission scenario is a multi-station uRLLC scenario.

If the terminal device has detected the configuration information, the terminal device may assume that the current transmission scenario is a multi-station uRLLC scenario; or, if the terminal device has not detected the configuration information, the terminal device may assume that the current transmission scenario is an eMBB scenario with multiple stations. Thus, the configuration information may be a newly defined RNTI or a field in a newly defined DCI.

In another possible implementation, the configuration information may be considered as configuration information indicating an eMBB scenario, for example, indicating an exclusive feature of a multi-station eMBB scenario, or indicating that configuration information related to an existing multi-station eMBB scenario is being reused, indicating that the configuration information can be directly used to indicate that the current transmission scenario is an eMBB scenario with multiple stations.

Step 702: The network device sends the transmission mode indicator information to the terminal device. Accordingly, the terminal device receives transmission mode indicator information from the network device.

The transmission mode indicator information may be carried in DCI or RRC signaling. The transmission mode is one or more of: SDM transmission mode, FDM first transmission mode, FDM second transmission mode, TDM first transmission mode, or TDM second transmission mode.

For example, the transmission mode indicator information may be "SchemeSelection" in RRC signaling and is used to indicate the transmission mode. The transmission mode indicator information may include five parameters {1, 2, 3, 4, 5}, which respectively correspond to an SDM transmission mode, a first FDM transmission mode, a second FDM transmission mode, a first TDM transmission mode, or a second TDM transmission mode. . The transfer mode can be specified by specifying one of five options. The transmission mode indicator information may alternatively indicate the transmission mode using three bits. The specific way of specifying is not limited in this embodiment of the present application.

It should be noted that the sequence of step 701 and step 702 is not limited in this embodiment of the present application. For example, step 702 is performed before step 701, namely, the terminal device obtains the transmission mode indicator information from the received RRC signaling before obtaining the configuration information. It can be understood that there is a close relationship between configuration information and transmission mode indicator information.

Step 703: The terminal device determines the transmission mode based on the information of the transmission mode indicator.

After receiving the transmission mode indicator information, the terminal device directly determines, based on the transmission mode indicated in the transmission mode indicator information, the transmission mode used by the network device. In this case, the implementation is simple.

In an exemplary implementation, after the terminal device determines that the current transmission scenario is a multi-station uRLLC scenario, if the terminal device has successfully descrambled the physical downlink control channel (PDCCH) using the RNTI, the terminal device may determine the mode transmissions in uRLLC scenarios with multiple stations based on RNTI. The terminal device and the network device store mappings between different RNTIs and transmission modes in a multi-station uRLLC scenario. The terminal device can directly determine the current transmission mode of the network device based on the RNTI used to successfully descramble the PDCCH.

In the embodiment shown in FIG. 7, the terminal device can realize dynamic switching between the multi-station uRLLC scenario and the multi-station eMBB scenario based on the configuration information, and no additional indication overhead is required. After determining that the current transmission scenario is a multi-station uRLLC scenario, the terminal device determines the transmission mode in the multi-station uRLLC scenario based on the transmission mode indicator information. In this case, the implementation is simple.

In accordance with the method presented in the previous method embodiments, an embodiment of the present application further provides a corresponding communication device. The communication device includes a corresponding module capable of performing the above embodiment. A module may be software, hardware, or a combination of software and hardware.

The communications device may be a terminal device, a device within a terminal device, or a device that can be used in conjunction with a terminal device. In an embodiment, the communication device may include a transceiver unit and a processing unit.

In an exemplary implementation, the transceiver unit is configured to obtain configuration indicator information, where the configuration indicator information is one or more of: DMRS indicator information, retransmission indicator information, or transmission configuration indicator information; and the processing unit is configured to determine a transmission mode based on the configuration indicator information, where the transmission mode is one or more of: a space division multiplexing mode, a frequency division multiplexing mode, or a time division multiplexing mode.

Alternatively, the processing unit determines that the configuration indicator information is retransmission indicator information, and the retransmission indicator information is used to indicate a retransmission parameter in the time domain.

Alternatively, the processing unit is specifically configured to determine, based on the time domain retransmission parameter, that the transmission mode is a time division multiplexing mode.

Alternatively, the processing unit is specifically configured to: if the time domain retransmission parameter is the first time domain retransmission parameter, determining that the time division multiplexing mode is the first time division multiplexing mode; or, if the time domain retransmission parameter is the second time domain retransmission parameter, determining that the time division multiplexing mode is the second time division multiplexing mode; or, if the time domain retransmission parameter includes offset information, determining that the time division multiplexing mode is the first time division multiplexing mode; or, if the time domain retransmission parameter does not include offset information, determining that the time division multiplexing mode is the second time division multiplexing mode, where

the first time division multiplexing mode is a time division multiplexing mode in a slot block, and the second time division multiplexing mode is a time division multiplexing mode between slot blocks.

Alternatively, the processing unit determines that the configuration indicator information is retransmission indicator information, and the retransmission indicator information is used to indicate the first time domain retransmission parameter and the second time domain retransmission parameter; And

the processing unit is specifically configured to: if both the first time domain retransmission parameter and the second time domain retransmission parameter are equal to the first predetermined value, determining that the transmission mode is a space division multiplexing mode, a frequency division multiplexing mode channels or a combined mode from a space division multiplexing mode and a frequency division multiplexing mode; or, if one or both of the first time domain retransmission parameter and the second time domain retransmission parameter is greater than the first predetermined value, determining that the transmission mode is a time division multiplexing mode.

Alternatively, the processing unit is specifically configured to:

if the first time domain retransmission parameter is equal to the first predetermined value and the second time domain retransmission parameter is greater than the first predetermined value, determining that the time division multiplexing mode is the second time division multiplexing mode;

if the second time domain retransmission parameter is equal to the first predetermined value, and the first time domain retransmission parameter is greater than the first predetermined value, determining that the time division multiplexing mode is the first time division multiplexing mode; or

if both the first time domain retransmission parameter and the second time domain retransmission parameter are greater than the first predetermined value, determining that the time division multiplexing mode is the combined mode from the first time division multiplexing mode and the second time division multiplexing mode time division of channels, where

the first time division multiplexing mode is a time division multiplexing mode in a slot block, and the second time division multiplexing mode is a time division multiplexing mode between slot blocks.

Alternatively, if the transceiver unit has not received the configuration indicator information, the processing unit is further configured to determine that the transmission mode is a space division multiplexing mode, a frequency division multiplexing mode, or a combined mode from a spatial division multiplexing mode, and a frequency division multiplexing mode.

Alternatively, the processing unit determines that the configuration indicator information is DMRS indicator information; And

the processing unit is specifically configured to: determine one or more DMRS port IDs based on the DMRS indicator information, and determine a transmission mode based on the one or more DMRS port IDs.

Alternatively, the processing unit is specifically configured to:

if the number of CDM groups corresponding to one or more DMRS port IDs is equal to the second predetermined value, determining that the transmission mode is a frequency division multiplexing mode; or, if the number of CDM groups corresponding to one or more DMRS port IDs is equal to the third predetermined value, determining that the transmission mode is a space division multiplexing mode; or

if one or more DMRS port IDs belong to the same CDM group, determining that the transmission mode is a frequency division multiplexing mode; or, if one or more DMRS port IDs do not belong to the same CDM group, determining that the transmission mode is a space division multiplexing mode; or

if the number of one or more DMRS port IDs is equal to the second predetermined value, determining that the transmission mode is a frequency division multiplexing mode; or, if the number of one or more DMRS port IDs is not equal to the second predetermined value, determining that the transmission mode is a space division multiplexing mode; or

if one or more DMRS port IDs are predetermined IDs, determining that the transmission mode is a frequency division multiplexing mode; or, if one or more DMRS port IDs are not the given IDs, determining that the transmission mode is a space division multiplexing mode.

Alternatively, the processing unit determines that the configuration indicator information is DMRS indicator information; And

the processing unit is specifically configured to: determine the number of CDM groups based on the DMRS indicator information, and determine the transmission mode based on the number of CDM groups.

Alternatively, the processing unit is specifically configured to: if the number of CDM groups is equal to the second predetermined value, determining that the transmission mode is a frequency division multiplexing mode; or, if the number of CDM groups is equal to the third predetermined value, determining that the transmission mode is a space division multiplexing mode.

Alternatively, the processing unit is specifically configured to: if a frequency domain retransmission parameter has been obtained, determining that the frequency division multiplexing mode is the second frequency division multiplexing mode; or, if no frequency domain retransmission parameter has been obtained, determining that the frequency division multiplexing mode is the first frequency division multiplexing mode, where

the first frequency division multiplexing mode is a frequency division multiplexing mode based on one codeword, and the second frequency division multiplexing mode is a frequency division multiplexing mode based on multiple codewords.

Alternatively, the processing unit is specifically configured to: determine, based on the time domain retransmission parameter, that the transmission mode is a second time division multiplexing mode, where the second time division multiplexing mode is a time division multiplexing mode channels between slot blocks.

Alternatively, the processing unit determines that the configuration indicator information is DMRS indicator information; And

the processing unit is specifically configured to: determine the DMRS port information based on the DMRS indicator information, and determine the transmission mode based on the DMRS port information.

Alternatively, the processing unit determines that the DMRS port information includes one or more DMRS port IDs and the number of CDM groups without data; And

the processing unit is specially configured to:

determining, based on the number of CDM groups corresponding to one or more DMRS port IDs and the number of CDM groups without data, that the transmission mode is a spatial multiplexing mode, a frequency division multiplexing mode, or a first time division multiplexing mode, where the first the time division multiplexing mode is a time division multiplexing mode in the slot block; And

if the transmission mode is a frequency division multiplexing mode, determining, based on the group ID of the CDM group corresponding to one or more DMRS port IDs, that the transmission mode is the first frequency division multiplexing mode or the second frequency division multiplexing mode, where the first frequency division multiplexing mode is a frequency division multiplexing mode based on one codeword, and the second frequency division multiplexing mode is a frequency division multiplexing mode based on multiple codewords.

Alternatively, the processing unit determines that the configuration indicator information is DMRS indicator information and retransmission indicator information, and the retransmission indicator information is used to indicate a frequency domain retransmission parameter, a first time domain retransmission parameter, and a second retransmission parameter. in the time domain; And

the processing unit is specifically configured to: determine the number of CDM groups based on the DMRS indicator information, and determine the transmission mode based on the number of CDM groups, the frequency domain retransmission parameter, the first time domain retransmission parameter, and the second time domain retransmission parameter.

Alternatively, the processing unit determines that the configuration indicator information is transmission configuration indicator information, and the transmission configuration indicator information is used to indicate the state of the transmission configuration indicator; And

the processing unit is specially configured to:

if the number of states of the transmission configuration indicator is equal to the fourth predetermined value, determining that the transmission mode is a frequency division multiplexing mode or a space division multiplexing mode; or

if the number of states of the transmission configuration indicator is greater than the fourth predetermined value, determining that the transmission mode is a time division multiplexing mode.

Alternatively, the processing unit determines that the configuration indicator information is transmission configuration indicator information and retransmission indicator information, the transmission configuration indicator information is used to indicate the state of the transmission configuration indicator, and the retransmission configuration indicator information is used to indicate a retransmission parameter in time. areas; And

the processing unit is specifically configured to: determine, based on the number of states of the transmission configuration indicator and the time domain retransmission parameter, that the transmission mode is a time division multiplexing mode.

In an exemplary implementation, the processing unit is configured to: if the transceiver unit has received the configuration information, obtain transmission mode indicator information, where the transmission mode indicator information is used to indicate the transmission mode; and determining a transmission mode based on the information of the transmission mode indicator.

Alternatively, the transmission mode is one or more of: a space division multiplexing mode, a first frequency division multiplexing mode, a second frequency division multiplexing mode, a first time division multiplexing mode, or a second time division multiplexing mode, where

the first frequency division multiplexing mode is a frequency division multiplexing mode based on a single codeword, the second frequency division multiplexing mode is a frequency division multiplexing mode based on multiple codewords, the first time division multiplexing mode is a multiplexing mode time division multiplexing in a slot block, and the second time division multiplexing mode is a time division multiplexing mode between slot blocks.

Alternatively, the configuration information is used to indicate that the terminal device can use a bit rate lower than a given bit rate, or is used to indicate that the terminal device uses a given modulation and coding scheme table.

In FIG. 8 shows a schematic block diagram of a communication device 800. Communication device 800 may be a network device, may be a terminal device, may be a chip, system on a chip, processor, or the like that supports the network device in implementing the above method, or may be a chip, system on a chip, processor, or the like. that support the terminal device when implementing the above method. The device may be configured to implement the method described in the previous method embodiments. See the descriptions of the above method embodiments for details.

Communications device 800 may include one or more processors 801. Processor 801 may be a general purpose processor, a special purpose processor, or the like. For example, processor 801 may be a baseband processor or a central processing unit. The baseband processor may be configured to process the communication protocol and communication data. The CPU may be configured to: control a communication device (eg, a base station, baseband chip, terminal, terminal chip, DU, or CU), execute a program, and process software program data.

Alternatively, communication device 800 may include one or more memory devices 802. Memory 802 may store instruction 804, and that instruction may be executed in processor 801 such that device 800 performs the method described in previous method embodiments. Alternatively, memory 802 may additionally store data. The processor 801 and memory 802 may be located separately or may be combined together.

Alternatively, the communication device 800 may further include a transceiver 805 and an antenna 806. The transceiver 805 may be referred to as a transceiver unit, a transceiver machine, a transceiver circuit, a transceiver, or the like, and is configured to perform receive and send functions.

Communication device 800 is a terminal device. Processor 801 is configured to perform step 602 in FIG. 6 and step 703 in FIG. 7. The transceiver 805 is configured to perform step 601 in FIG. 6, step 701 and step 702 in FIG. 7. Alternatively, transceiver 805 and antenna 806 are configured to perform step 601 in FIG. 6, step 701 and step 702 in FIG. 7.

If the communication device 800 is a network device, the transceiver 805 is configured to perform step 601 in FIG. 6, step 701 and step 702 in FIG. 7. Alternatively, transceiver 805 and antenna 806 are configured to perform step 601 in FIG. 6, step 701 and step 702 in FIG. 7. In another embodiment, processor 801 may alternatively store instruction 803. Instruction 803 may be executed by the processor, so communication device 800 performs the method described in previous method embodiments.

In another additional design, the processor 801 may include a transceiver configured to implement receive and send functions. For example, a transceiver may be a transceiver circuit, an interface, or an interface circuit. A transceiver circuit, an interface, or an interface circuit configured to implement the receive and send functions may be separated or may be combined together. The transceiver circuit, interface or interface circuit may be configured to read and write code/data; or the transceiver circuit, the interface, or the interface circuit may be configured to transmit or carry a signal.

In another possible design, the communication device 800 may include a circuit, and in the above method embodiments, the circuit may perform a send function, a receive function, or a communication function.

The processor and transceiver described in this application can be implemented on an integrated circuit (integrated circuit, IC), analog IC, radio frequency integrated circuit RFIC, hybrid signal IC, application specific integrated circuit (ASIC), printed circuit board (printed circuit board, PCB), electronic device, etc. Alternatively, the processor and transceiver can be fabricated using various IC technologies, such as complementary metal oxide semiconductor (CMOS), nMetal-oxide-semiconductor (NMOS), semiconductor based on p-type metal oxide (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (BJT), bipolar CMOS (BiCMOS), silicon-germanium (SiGe) and gallium arsenide (GaAs).

The communication device in the previous embodiment may be a network device or a terminal device. However, the scope of the communication device described in the present application is not limited to this, and the structure of the communication device need not be limited to FIG. 8. The communication device may be an independent device or may be part of a relatively large device. For example, a communication device may be:

(1) an independent integrated circuit (IC), chip, system on a chip, or subsystem;

(2) a set including one or more ICs, where as an option, the IC set may further include a storage component configured to store data and instructions;

(3) ASIC, such as a modem (MSM);

(4) a module that can be embedded in another device;

(5) a receiver, a terminal, an intelligent terminal, a cellular phone, a wireless device, a handheld phone, a mobile device, an automobile device, a network device, a cloud device, an artificial intelligence device, or the like; And

(6) other devices.

In FIG. 9 shows a schematic block diagram of a terminal device 900. To simplify the description, FIG. 9 shows only the main components of the terminal device. As shown in FIG. 9, terminal device 900 includes a processor, a memory, a control circuit, an antenna, and an input/output device. The processor is mainly configured to: process the communication protocol and communication data, control the entire terminal, execute the software program, and process the data of the software program. Memory is mainly for storing software and data. The RF circuit is mainly configured to: perform conversion between the baseband signal and the RF signal, and process the RF signal. The antenna is generally configured to receive and send a radio frequency signal in the form of an electromagnetic wave. An input/output device, such as a touch screen, display, or keyboard, is generally configured to receive data entered by a user and output data to the user.

After the terminal device is turned on, the processor can read the software program in the memory unit, parse and execute the software program instruction, and process the software program data. When data is to be sent wirelessly, after performing baseband processing on the data to be sent, the processor outputs the baseband signal to the RF circuit. After processing the baseband signal, the RF circuit receives the RF signal and sends the RF signal out through the antenna as an electromagnetic wave. When data is transmitted to the terminal device, the RF circuit receives the RF signal through the antenna, further converts the RF signal into a baseband signal, and outputs the baseband signal to the processor; and the processor converts the baseband signal into data and processes the data.

To simplify the description in FIG. 9 shows only one memory and one processor. An actual terminal device may have multiple processors and multiple storage devices. A memory may also be referred to as a storage medium, storage device, or the like. This is not limited to this embodiment of the present invention.

In a further implementation, the processor may include a baseband processor and a central processing unit. The baseband processor is generally configured to process the communication protocol and communication data. The central processing unit is mainly configured to: control the entire terminal device, execute the program, and process the program data. The baseband processor and central processor functions are integrated into the processor shown in FIG. 9. One of ordinary skill in the art will understand that the baseband processor and the central processor may be independent processors and are connected to each other using technologies such as a bus. One skilled in the art would appreciate a terminal device may include a plurality of baseband processors to adapt to various network standards, a terminal device may include a plurality of CPUs to improve the processing capabilities of the terminal device, and components of the terminal device may be connected to each other. using different tires. A baseband processor can also be thought of as a baseband processing circuit or baseband processing chip. The central processing unit can also be thought of as a central processing unit circuit or a central processing unit chip. The communication protocol and communication data processing function may be built into the processor or may be stored in a memory unit as a program. The processor executes a program for realizing the baseband processing function.

A person skilled in the art may further appreciate that the various illustrative logical blocks and steps listed in the embodiments of the present application may be implemented using electronic hardware, computer software, or a combination thereof. Whether such a function is implemented in hardware or software depends on the particular application and overall system design requirements. A person skilled in the art may use various ways to implement the described functions for each particular application, but such an implementation should not be considered to be outside the scope of the embodiments of the present application.

The present application further provides a computer-readable storage medium. A computer-readable storage medium stores a computer program. When the computer program is executed by the computer, the function of any of the above method embodiments is implemented.

The present application further provides a computer program product. When the computer program product is executed by the computer, the function of any of the above method embodiments is implemented.

All or some of the above embodiments may be implemented in software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, all or some of the embodiments may be implemented as a computer program product. The computer program product includes one or more computer instructions. When computer instructions are downloaded and executed on a computer, procedures or functions are generated in whole or in part according to embodiments of the present application. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions may be stored on a computer-readable storage medium or may be transferred from one computer-readable storage medium to another computer-readable storage medium. For example, computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (for example, coaxial cable, fiber optic cable, or digital subscriber line). line, DSL)) or wirelessly (for example, via infrared waves, radio waves and microwaves). A computer-readable storage medium can be any usable storage medium accessible to a computer, or a data storage device, such as a server or data center, incorporating one or more usable storage media. The storage medium used can be a magnetic storage medium (for example, a floppy disk, hard disk or magnetic tape), an optical storage medium (for example, a high-density digital video disc (DVD)), a semiconductor storage medium (for example, a solid state drive (solid state disk, SSD)) or the like.

One of ordinary skill in the art will appreciate that the various reference numerals such as "first" and "second" are used here only to distinguish for the purpose of simplifying the description and are not used to limit the scope of the embodiments of the present application or to represent a sequence.

The correspondences given in the tables in this application may be configured or may be given. The information values in the tables are examples only and other values can be configured. This is not limited in the present application. When the mapping between the information and each parameter is configured, not all of the mappings shown in the tables need to be configured. For example, in the tables of this application, the correspondences shown in some rows may not be configured. As another example, appropriate changes and adjustments such as splitting and merging can be made based on the above tables. The names of the parameters shown in the headings of the previous tables may also have other names that can be understood by the communication device, and the values or representations of the parameters may also have other values or representations that can be understood by the communication device. The implementation of the above tables may use another data structure such as an array, queue, container, stack, linear table, pointer, linked list, tree, graph, structure, class, stack, or hash table.

As used herein, the term "set" can be understood to mean "define", "predetermine", "store", "prestore", "prenegotiate", "preconfigure", "fix" or "prerecord".

One skilled in the art may be aware that, in combination with the examples described in the embodiments disclosed herein, the blocks and steps of an algorithm may be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed by hardware or software depends on the particular application and design constraints of the technical solutions. A person skilled in the art can use different methods to implement the described functions for each particular application, but such an implementation should not be considered outside the scope of this application.

A person skilled in the art can clearly understand that for the purposes of convenient and concise description, the detailed operating processes of the above system, device, and unit refer to the corresponding processes in the above method embodiments, and the details are not repeated herein.

The above descriptions are only specific implementations of the present application, but are not intended to limit the scope of protection of the present application. Any variation or replacement easily recognized by one of skill in the art within the technical scope disclosed in this application should fall within the protection scope of this application. Thus, the scope of protection of the present application should be consistent with the scope of protection of the claims.

Claims (59)

1. A method for determining a transmission mode, comprising the steps of: generating configuration indicator information, wherein the configuration indicator information contains demodulation reference signal (DMRS) indicator information or retransmission indicator information and transmission configuration indicator information, the configuration indicator information is used to determine the transmission mode, and the transmission mode contains one of the space division multiplexing mode channels, frequency division multiplexing mode or time division multiplexing mode; And transmit configuration pointer information. 2. The method of claim 1, wherein the configuration indicator information contains DMRS indicator information; A using the configuration indicator information to determine the transmission mode comprises a sub-step of: using the DMRS indicator information to determine the number of code division multiplexing (CDM) groups, the number of CDM groups being used to determine the transmission mode. 3. The method of claim 2, wherein the step of using the number of CDM groups to determine the transmission mode comprises a sub-step of: it is determined if the number of CDM groups is the second predetermined value that the transmission mode is a frequency division multiplexing mode, if the number of CDM groups is the third predetermined value, that the transmission mode is a space division multiplexing mode. 4. The method of claim 3, wherein the second setpoint is 1. 5. The method according to claim 3 or 4, wherein the third setpoint is 2. 6. The method of claim 1, wherein the configuration indicator information comprises transmission configuration indicator information and retransmission indicator information, wherein the transmission configuration indicator information is used to indicate a state of the transmission configuration indicator, and the retransmission indicator information is used to indicate a retransmission parameter during time domain; wherein using the configuration indication information to determine the transmission mode comprises a sub-step of: determining if the number of transmission states of the transmission configuration indicator corresponding to the information of the transmission configuration indicator is greater than or equal to the fourth predetermined value, that the transmission mode is a time division multiplexing mode. 7. The method of claim 6 wherein the fourth setpoint is 2. 8. A method for determining a transmission mode, comprising the steps of: obtaining configuration indicator information, wherein the configuration indicator information contains demodulation reference signal (DMRS) indicator information or retransmission indicator information and transmission configuration indicator information; And determining a transmission mode based on the configuration indicator information, the transmission mode comprising one of a space division multiplexing mode, a frequency division multiplexing mode, and a time division multiplexing mode. 9. The method of claim 8, wherein the configuration indicator information contains DMRS indicator information; A the step of determining the transmission mode based on the configuration indicator information comprises a sub-step of: determining the number of code division multiplexing (CDM) groups based on the DMRS indicator information, and determining a transmission mode based on the number of CDM groups. 10. The method of claim 9, wherein the step of determining a transmission mode based on the number of CDM groups comprises a sub-step of: determining when the number of CDM groups is equal to the second predetermined value that the transmission mode is a frequency division multiplexing mode; or determining when the number of CDM groups is equal to the third predetermined value that the transmission mode is a space division multiplexing mode. 11. The method of claim 10, wherein the second setpoint is 1. 12. The method of claim 10 or 11, wherein the third setpoint is 2. 13. The method of claim 8, wherein the configuration indicator information comprises transmission configuration indicator information and retransmission indicator information, wherein the transmission configuration indicator information is used to indicate the state of the transmission configuration indicator, and the retransmission indicator information is used to indicate a retransmission parameter during time domain; wherein the step of determining the transmission mode based on the configuration indicator information comprises sub-steps of: determining if the number of transmission states of the transmission configuration indicator corresponding to the information of the transmission configuration indicator is greater than or equal to the fourth predetermined value, that the transmission mode is a time division multiplexing mode. 14. The method of claim 13 wherein the fourth setpoint is 2. 15. A communication device containing at least one processor and a transceiver, while the processor is configured to generate configuration indicator information, wherein the configuration indicator information contains demodulation reference signal (DMRS) indicator information or retransmission indicator information and transmission configuration indicator information, the configuration indicator information is used to determine the transmission mode, and the transmission mode contains one of the mode a space division multiplexing mode, a frequency division multiplexing mode, or a time division multiplexing mode; A the transceiver is configured to transmit configuration indicator information. 16. The communication device according to claim 15, wherein the configuration indicator information contains DMRS indicator information; A using configuration pointer information to determine the transfer mode includes: using the DMRS indicator information to determine the number of code division multiplexing (CDM) groups, wherein the number of CDM groups is used to determine the transmission mode. 17. The communications device of claim 16, wherein the number of CDM groups used to determine the transmission mode comprises: determining if the number of CDM groups is the second predetermined value that the transmission mode is a frequency division multiplexing mode, if the number of CDM groups is the third predetermined value, that the transmission mode is a space division multiplexing mode. 18. The communications device of claim 17, wherein the second setpoint is 1. 19. The communication device according to claim 17 or 18, wherein the third setpoint is 2. 20. The communication apparatus of claim 15, wherein the configuration indicator information comprises transmission configuration indicator information and retransmission indicator information, wherein the transmission configuration indicator information is used to indicate the state of the transmission configuration indicator, and the retransmission indicator information is used to indicate a retransmission parameter. in the time domain; wherein using the configuration indication information to determine the transmission mode comprises: determining if the number of transmission states of the transmission configuration indicator corresponding to the information of the transmission configuration indicator is greater than or equal to the fourth predetermined value, that the transmission mode is a time division multiplexing mode. 21. The communication device according to claim 20, wherein the fourth set value is 2. 22. A communication device containing at least one processor and a transceiver, while the transceiver is configured to obtain configuration indicator information, the configuration indicator information comprising demodulation reference signal (DMRS) indicator information or retransmission indicator information and transmission configuration indicator information; A the processor is configured to determine a transmission mode based on the configuration indicator information, wherein the transmission mode is one of: a space division multiplexing mode, a frequency division multiplexing mode, or a time division multiplexing mode. 23. The communication device according to claim 22, wherein the configuration indicator information contains DMRS indicator information; wherein the processor is configured to determine the number of code division multiplexing (CDM) groups based on the DMRS indicator information and determine the transmission mode based on the number of CDM groups. 24. The communications device of claim 23, wherein the processor is configured to: determining when the number of CDM groups is equal to the second predetermined value that the transmission mode is a frequency division multiplexing mode; or determining, when the number of CDM groups is equal to the third predetermined value, that the transmission mode is a space division multiplexing mode. 25. The communication device of claim 24, wherein the second set value is 1. 26. Communication device according to claim 10 or 11, wherein the third set value is 2. 27. The communication apparatus of claim 22, wherein the configuration indicator information comprises retransmission indicator information and transmission configuration indicator information, wherein the retransmission indicator information is used to indicate a time domain retransmission parameter, and the transmission configuration indicator information is used to indicate the state of the indicator. transmission configurations; wherein the processor is configured to: determine if the number of transmission states of the transmission configuration indicator corresponding to the information of the transmission configuration indicator is greater than or equal to a fourth predetermined value, that the transmission mode is a time division multiplexing mode. 28. The communication device according to claim 27, wherein the fourth set value is 2. 29. A communication device containing a processor and an interface, while the interface is configured to communicate, and the processor is configured to execute a computer program causing the implementation of the method according to any one of paragraphs. 1-14. 30. A communication device comprising a data storage device and a processor, the data storage device is configured to store a computer program, and the processor is configured to execute said computer program to implement the method according to any one of paragraphs. 1-14. 31. Communication device according to claim 29 or 30, characterized in that it is a system on a chip. 32. A computer-readable storage medium that stores a computer program that causes, when executed on a computer, the computer to execute the method according to any one of paragraphs. 1-14. 33. A communication system comprising a first communication device and a second communication device, wherein the first communication device is configured to implement the method according to any one of paragraphs. 1-7, and the second communication device is configured to implement the method according to any one of paragraphs. 8-14.