Information transmission method and communication apparatus

Abstract

An information transmission method and a communication apparatus. Uplink sub-band precoding information is indicated by means of two levels of DCIs. A first-level DCI on a PDCCH only needs to indicate one rate matching parameter. The rate matching parameter can be used for determining: whether there is a second-level DCI on a PDSCH, and the ratio of a resource occupied by a second DCI to a resource occupied by the PDSCH. The second-level DCI is used for indicating sub-band precoding information. During downlink data transmission, the sub-band precoding information can be optionally transmitted directly along with the PDSCH, and there is no need to additionally schedule a special PDSCH to transmit the second DCI. The indication overhead of the first-level DCI indicating whether there is the second-level DCI on the PDSCH and a specific resource mapping position is reduced, and the length of the first-level DCI is reduced, so that fewer communication resources are required to transmit the first-level DCI, thereby reducing the consumption of communication resources.

Description

Information transmission method and communication device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on October 27, 2023, with application number 2023114232198 and application name “Method and Communication Device for Information Transmission”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and more specifically, to an information transmission method and a communication device. Background Art

[0003] In an uplink multi-user multiple input multiple output (MU-MIMO) system, to suppress interference between users (terminal devices), the terminal device typically uses an uplink precoding matrix to preprocess the uplink data to be transmitted. Currently, the uplink precoding matrix used by the terminal device is indicated to the terminal device by the network.

[0004] In an uplink MU-MIMO system, the uplink precoding matrix indicated by the network device to the terminal device is the uplink precoding matrix corresponding to uplink resources with broadband granularity. Since the terminal device can also use uplink resources with subband (sub-bandwidth) granularity for uplink data transmission, the network device also needs to indicate the uplink precoding matrix corresponding to uplink resources with subband (sub-bandwidth) granularity to the terminal device.

[0005] When the network device indicates the uplink precoding matrix corresponding to the uplink resources with sub-band granularity to the terminal device, more communication resources need to be used to indicate the sub-band precoding information to the terminal device, resulting in serious consumption of communication resources.

[0006] Summary of the Invention

[0007] The present application provides a method and communication device for information transmission, which uses two-level DCI to indicate uplink subband precoding information. The first-level DCI on the PDCCH channel only needs to indicate a rate matching parameter, and the rate matching parameter can be used to determine: whether the second-level DCI on the PDSCH exists, and the ratio of the resources occupied by the second DCI to the resources occupied by the PDSCH. The second-level DCI is used to indicate subband precoding information. The indication overhead of the first-level DCI indicating whether the second-level DCI exists and the specific resource mapping location is reduced, and the length of the first-level DCI is reduced, so that fewer communication resources are required to send the first-level DCI, thereby reducing the consumption of communication resources.

[0008] In a first aspect, a method for information transmission is provided. The execution subject of the method can be a network device, or a chip, chip system, or processor that supports the network device to implement the method, or a logical node, logic module, or software that can implement all or part of the network device functions. The method includes: sending a first DCI, the first DCI being carried on a PDCCH channel, the first DCI including a first parameter, the first parameter being used to determine whether a second DCI on a PDSCH channel exists, or at least one of the resources occupied by the second DCI on the PDSCH, the second DCI including: information about an uplink precoding matrix corresponding to uplink resources with subband granularity; sending downlink data, sending downlink data and a second DCI, or sending the second DCI on the PDSCH channel.

[0009] The information transmission method provided in the first aspect uses two-level DCI (i.e., the first DCI and the second DCI) to indicate uplink precoding. When there is downlink data transmission (PDSCH), the indication information of the uplink subband precoding can be selected to be placed on the PDSCH for transmission together with the downlink data. The first DCI on the PDCCH only needs to dynamically indicate a rate matching parameter (first parameter). The rate matching parameter implicitly indicates the accompanying conditions, that is, it implicitly indicates whether the second-level DCI on the PDSCH exists and the resources occupied by the second DCI on the PDSCH (for example, the proportion of the second DCI resources to the available resources of the PDSCH, or the number of REs occupied by the second DCI on the PDSCH). The indication overhead of the first-level DCI indicating whether the second-level DCI exists and the specific resource mapping position is reduced, and the length of the first-level DCI is reduced, so that fewer communication resources are required to send the first-level DCI, thereby reducing the consumption of communication resources.

[0010] Exemplarily, the first parameter may be a rate matching parameter.

[0011] Exemplarily, the sub-band (sub-bandwidth) granularity may include, for example, RBG granularity, and the wideband granularity may include, for example, BWP granularity.

[0012] When the second DCI is transmitted on the PDSCH, the content transmitted (or carried) on the PDSCH includes: downlink data and the second DCI; or the second DCI. When the second DCI is not transmitted on the PDSCH, the content transmitted (or carried) on the PDSCH includes: downlink data.

[0013] In the case where the second DCI on the PDSCH exists, the first parameter is also used to determine: the resources occupied by the second DCI on the PDSCH. For example, the first parameter can be used to determine the proportion of the second DCI in the available resources on the PDSCH. Since the content originally transmitted on the PDSCH includes reference signals and downlink data, the PDSCH resources include: the sum of reference signal resources and downlink data transmission resources. The available resources on the PDSCH (PDSCH available resources) can be understood as the resources occupied by downlink data (i.e., downlink data transmission resources). If the second DCI on the PDSCH exists, the resources occupied by the second DCI are the resources for downlink data transmission, that is, the resources occupied by the second DCI are the PDSCH available resources.

[0014] In one possible implementation of the first aspect, the resource mapping mode and / or MCS of the second DCI are predefined or preconfigured. In this implementation, additional fields or signaling are not required in the first DCI to indicate the resource mapping mode and MCS of the second DCI, thereby further reducing the overhead of the first DCI.

[0015] In one possible implementation of the first aspect, a resource mapping method for the second DCI includes mapping starting from the first RE that does not contain a reference signal symbol on the PDSCH. In this implementation, the second DCI is relatively close to the reference signal, which can improve the accuracy of second DCI decoding and the efficiency of second DCI transmission.

[0016] Exemplarily, the reference signals on the PDSCH may include: DMRS, CSI-RS, etc.

[0017] In one possible implementation of the first aspect, when both the second DCI and downlink data are present on the PDSCH, the MCS of the second DCI is the same as the MCS of the downlink data transmitted on the PDSCH. This implementation facilitates rate matching between the second DCI and the downlink data on the PDSCH, reduces the complexity of rate matching between the second DCI and the downlink data on the PDSCH, and facilitates implementation.

[0018] In a possible implementation of the first aspect, downlink data on the PDSCH exists, and the second DCI on the PDSCH channel exists when the following conditions are met:

[0019] K PDSCH ≥O DCI ×α; or

[0020] Among them, α represents the first parameter, K PDSCH Indicates the number of source bits of downlink data on PDSCH, O DCIIndicates the number of source bits of the second DCI. In this implementation, when the second DCI is transmitted along with downlink data on the PDSCH, downlink data transmission on the PDSCH is not affected, thereby improving data transmission efficiency. Furthermore, the efficiency and accuracy of determining whether the second DCI is transmitted along with the PDSCH can be improved.

[0021] In a possible implementation of the first aspect, when downlink data and a second DCI are present on the PDSCH, the resources occupied by the second DCI on the PDSCH include: the number of REs occupied by the second DCI on the PDSCH, and the number of REs occupied by the second DCI on the PDSCH satisfies the following conditions:

[0022] S represents the number of REs occupied by the second DCI on PDSCH, M represents the number of REs available on PDSCH, α represents the first parameter, and K PDSCH Indicates the number of source bits of downlink data on PDSCH, O DCI Indicates the number of source bits of the second DCI. In this implementation, when the second DCI is transmitted along with downlink data on the PDSCH, downlink data transmission on the PDSCH is not affected, thereby improving data transmission efficiency. Furthermore, the efficiency and accuracy of determining the number of available REs occupied by the second DCI on the PDSCH can be improved.

[0023] In a possible implementation of the first aspect, when the value of the first parameter is the first value, the first value of the first parameter is used to indicate that the second DCI exists on the PDSCH channel and the PDSCH channel does not transmit, does not exist, or does not include downlink data.

[0024] In a possible implementation manner of the first aspect, when the value of the first parameter is not the first value, the value of the first parameter is used to indicate that downlink data is transmitted or included on the PDSCH channel.

[0025] Exemplarily, a mapping relationship or correspondence between the value of the first parameter and the transmission state of "no downlink data is carried on the PDSCH, only the second DCI is carried" may be configured or defined in advance. For example, when the value of the first parameter is configured or defined in advance as a first value, the transmission state is: no downlink data is carried on the PDSCH, only the second DCI is carried, and the second DCI includes subband precoding information.

[0026] Exemplarily, when the value of α is the first value, the resource mapping mode and / or MCS of the second DCI may also be predefined or preconfigured.

[0027] Exemplarily, when the value of α is the first value, the network device can map the second DCI on the PDSCH according to the mapping method of the resources of the second DCI and the MCS of the second DCI, so that the second DCI can be sent to the terminal device on the PDSCH, and the PDSCH does not include or transmit downlink data. The network device sends the second DCI on the PDSCH channel.

[0028] In the second aspect, a method for information transmission is provided, and the execution subject of the method can be a terminal device, or a chip, chip system, or processor that supports the terminal device to implement the method. The method includes: receiving a first DCI, the first DCI is carried on the PDCCH channel, the first DCI includes a first parameter, the first parameter is used to determine whether a second DCI exists on the PDSCH channel, or at least one of the resources occupied by the second DCI on the PDSCH, the second DCI includes: information of the uplink precoding matrix corresponding to the uplink resources with sub-band granularity; according to the first parameter, determine whether the second DCI exists on the PDSCH channel, or at least one of the resources occupied by the second DCI on the PDSCH; receive downlink data on the PDSCH channel, receive downlink data and the second DCI, or receive the second DCI.

[0029] The second aspect provides a method for information transmission. When downlink data is transmitted on the PDSCH, the uplink subband precoding indication information (i.e., the second-level DCI) and the downlink data can be received together on the PDSCH. The first-level DCI received on the PDCCH only needs to dynamically indicate a rate matching parameter (first parameter). The rate matching parameter implicitly indicates the accompanying conditions, i.e., implicitly indicates whether the second-level DCI on the PDSCH exists and the resources occupied by the second DCI on the PDSCH. The indication overhead of the first-level DCI indicating whether the second-level DCI exists and the specific resource mapping location is reduced, and the length of the first-level DCI is reduced, thereby requiring fewer communication resources to send the first-level DCI and reducing the consumption of communication resources.

[0030] When the second DCI is transmitted on the PDSCH, the content transmitted (or carried) on the PDSCH includes: downlink data and the second DCI; or the second DCI. When the second DCI is not transmitted on the PDSCH, the content transmitted (or carried) on the PDSCH includes: downlink data.

[0031] In a possible implementation manner of the second aspect, the resource mapping mode and / or MCS of the second DCI is predefined or preconfigured.

[0032] In a possible implementation manner of the second aspect, a resource mapping manner of the second DCI includes: mapping starting from the first RE that does not contain a reference signal symbol on the PDSCH.

[0033] In a possible implementation manner of the second aspect, when both the second DCI and downlink data on the PDSCH exist, the MCS of the second DCI is the same as the MCS of the downlink data transmitted on the PDSCH.

[0034] In a possible implementation of the second aspect, downlink data exists on the PDSCH, and the second DCI exists on the PDSCH channel when the following conditions are met:

[0035] K PDSCH ≥O DCI ×α; or

[0036] Among them, α represents the first parameter, K PDSCH Indicates the number of source bits of downlink data on PDSCH, O DCI Indicates the number of source bits of the second DCI.

[0037] In a possible implementation of the second aspect, when downlink data and a second DCI are present on the PDSCH, the resources occupied by the second DCI on the PDSCH include: the number of REs occupied by the second DCI on the PDSCH, and the number of REs occupied by the second DCI on the PDSCH satisfies the following conditions:

[0038] S represents the number of REs occupied by the second DCI on PDSCH, M represents the number of REs available on PDSCH, α represents the first parameter, and K PDSCH Indicates the number of source bits of downlink data on PDSCH, O DCI Indicates the number of source bits of the second DCI.

[0039] In a possible implementation of the second aspect, determining whether a second DCI exists on the PDSCH channel based on the first parameter includes: when the value of the first parameter is the first value, determining that the second DCI of the PDSCH channel exists, and the PDSCH channel does not transmit downlink data, that is, there is no downlink data transmission on the PDSCH channel.

[0040] In a possible implementation manner of the second aspect, when the value of the first parameter is not the first value, the value of the first parameter is used to indicate that downlink data is transmitted or included on the PDSCH channel.

[0041] In a possible implementation of the second aspect, the receiving of the second DCI on the PDSCH channel includes: demodulating the second DCI on the PDSCH channel according to the resource mapping method of the second DCI, the MCS of the second DCI, and the resources occupied by the second DCI on the PDSCH.

[0042] The technical effects corresponding to the second aspect and any possible implementation method of the second aspect can be found in the technical effects corresponding to the above-mentioned first aspect and any implementation method of the first aspect, and will not be repeated here.

[0043] In a third aspect, a communication device is provided, which includes: a module (for example, a processing module and an interface module) for executing each step in the above first aspect or any possible implementation of the first aspect. The device can be a network device, a chip, a chip system, or a processor in the network device, or a logical node, a logical module or software that can implement all or part of the functions of the network device.

[0044] In a fourth aspect, a communications device is provided, comprising at least one processor and memory, wherein the at least one processor is configured to execute the method of the first aspect or any possible implementation of the first aspect. The device may be a network device, a chip, a chip system, or a processor in a network device, or a logical node, a logical module, or software capable of implementing all or part of the network device's functions.

[0045] In a fifth aspect, a communication device is provided, comprising at least one processor and an interface circuit, wherein the at least one processor is configured to execute the method of the first aspect or any possible implementation of the first aspect. The device may be a network device, a chip, a chip system, or a processor in a network device, or a logical node, a logical module, or software capable of implementing all or part of the network device's functions.

[0046] In the sixth aspect, a communication device is provided, which includes: a module (for example, a processing module and an interface module) for executing each step in the above second aspect or any possible implementation of the second aspect. The device can be a terminal device, or a chip, chip system, or processor in the terminal device.

[0047] In a seventh aspect, a communication device is provided, comprising at least one processor and memory, wherein the at least one processor is configured to execute the method of the second aspect or any possible implementation of the second aspect. The device may be a terminal device, or a chip, chip system, or processor in the terminal device.

[0048] In an eighth aspect, a communication device is provided, comprising at least one processor and an interface circuit, wherein the at least one processor is configured to execute the method of the second aspect or any possible implementation of the second aspect. The device may be a terminal device, or a chip, chip system, or processor in the terminal device.

[0049] In a ninth aspect, a network device is provided, which includes the communication device provided in the third aspect, or the communication device provided in the fourth aspect, or the communication device provided in the fifth aspect.

[0050] In the tenth aspect, a terminal device is provided, which includes the communication device provided in the sixth aspect, or the terminal device includes the communication device provided in the seventh aspect, or the terminal device includes the communication device provided in the eighth aspect.

[0051] In the eleventh aspect, a computer program product is provided, which includes a computer program, which, when executed by a processor, is used to execute the method in the above first aspect or any possible implementation of the first aspect, or the method in the above second aspect or any possible implementation of the second aspect.

[0052] In the twelfth aspect, a computer-readable storage medium is provided, which stores a computer program. When the computer program is executed, it is used to execute the method in the above first aspect or any possible implementation of the first aspect, or the method in the above second aspect or any possible implementation of the second aspect.

[0053] In the thirteenth aspect, a chip is provided, which includes: a processor for calling and running a computer program from a memory, so that a communication device equipped with the chip executes: the method in the above first aspect or any possible implementation of the first aspect, or the method in the above second aspect or any possible implementation of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] FIG1 is a schematic diagram of a communication system provided in an embodiment of the present application to which the method provided in the present application can be applied.

[0055] Figure 2 is a schematic diagram of an example of a gNB-CU-CP and gNB-CU-UP separation architecture provided in an embodiment of the present application.

[0056] FIG3 is a schematic diagram of a wireless access network device (network device) provided in an embodiment of the present application.

[0057] Figure 4 is a schematic diagram of a control plane protocol layer structure between a network device and a terminal device provided in an embodiment of the present application.

[0058] FIG5 is a schematic flowchart of an information transmission method provided in an embodiment of the present application.

[0059] FIG6 is a schematic block diagram of a communication device according to an embodiment of the present application.

[0060] FIG7 is a schematic block diagram of another communication device provided in an embodiment of the present application.

[0061] FIG8 is a schematic block diagram of a communication device according to an embodiment of the present application.

[0062] FIG9 is a schematic block diagram of another communication device provided in an embodiment of the present application.

[0063] FIG10 is a schematic block diagram of a terminal device provided in an embodiment of the present application.

[0064] FIG11 is a schematic block diagram of a network device according to an embodiment of the present application. DETAILED DESCRIPTION

[0065] The technical solution in this application will be described below with reference to the accompanying drawings.

[0066] In the description of the embodiments of this application, unless otherwise specified, " / " represents or. For example, A / B can represent A or B. "And / or" in this article is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of this application, "plurality" means two or more than two.

[0067] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this embodiment, unless otherwise specified, "plurality" means two or more.

[0068] In an embodiment of the present application, a terminal device or a network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory). The operating system can be any one or more computer operating systems that implement business processing through processes, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. In addition, the embodiment of the present application does not specifically limit the specific structure of the execution subject of the method provided in the embodiment of the present application. As long as it is possible to communicate according to the method provided in the embodiment of the present application by running a program that records the code of the method provided in the embodiment of the present application, for example, the execution subject of the method provided in the embodiment of the present application can be a terminal device or a network device, or a functional module in the terminal device or the network device that can call a program and execute the program.

[0069] In addition, various aspects or features of the present application can be implemented as methods, devices or products using standard programming and / or engineering techniques. The term "product" as used in this application covers computer programs that can be accessed from any computer-readable device, carrier or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks or magnetic tapes, etc.), optical disks (e.g., compact discs (CDs), digital versatile discs (DVDs), etc.), smart cards and flash memory devices (e.g., erasable programmable read-only memories (EPROMs), cards, sticks or key drives, etc.). In addition, the various storage media described herein may represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and / or carrying instructions and / or data.

[0070] Multiple-user multiple input multiple output (MU-MIMO) systems achieve greater system capacity by simultaneously transmitting multiple spatial streams. To ensure the transmission performance of multiple spatial streams, precoding technology is an effective means of reducing interference between users and streams, thereby improving the signal-to-noise ratio at the receiver.

[0071] Precoding technology can be understood as: when the channel state is known, the transmitting device can use a precoding matrix that matches the channel to preprocess the transmitted signal, so that the precoded transmitted signal adapts to the channel, thereby improving transmission performance and receiving signal quality. For example, it can increase the signal to interference plus noise ratio (SINR).

[0072] In an uplink multi-MU MIMO system, to suppress interference between users, the terminal device usually needs to use an uplink precoding matrix to preprocess the uplink data to be transmitted. Currently, the uplink precoding matrix used by the terminal device is indicated to the terminal device by the network side.

[0073] In an uplink MU MIMO system, the uplink precoding matrix indicated by the network device to the terminal device is the uplink precoding matrix corresponding to uplink resources of broadband granularity. Broadband granularity includes, for example, bandwidth part (BWP) granularity.

[0074] For example, the protocol designs downlink control information (DCI) format 0_1 ​​(DCI format 0_1) for the uplink precoding matrix indication corresponding to broadband uplink resources. The 6-bit Transmitted Precoding Matrix Indicator (TPMI) field in DCI format 0_1 ​​is used to indicate to the user equipment (UE) the index of the precoding matrix to be used for its uplink transmission.

[0075] Because terminal devices can also use uplink resources with subband (subbandwidth) granularity for uplink data transmission, subband (subbandwidth) can be understood as dividing the broadband into multiple parts, each of which can be a subband or subbandwidth. Subband (subbandwidth) granularity can include, for example, resource block group (RBG) granularity. The network device also needs to indicate to the terminal device the uplink precoding matrix corresponding to the uplink resources with subband (subbandwidth) granularity.

[0076] For the network device to indicate to the terminal device the uplink precoding matrix corresponding to the uplink resources with sub-bandwidth granularity, one possible implementation method is to continue to use the indication method of broadband granularity and extend it to sub-band granularity indication. Specifically, a 6-bit TPMI indication subfield is allocated to each subband in the DCI to indicate the index of the uplink precoding matrix corresponding to the uplink resources with sub-bandwidth granularity. In other words, the 6-bit TPMI corresponding to each subband in the DCI indicates: the index of the precoding matrix that needs to be used on the subband when the UE transmits uplink.

[0077] Using this approach, on the one hand, because the number of subbands scheduled by the UE may change dynamically, the indication overhead (the length of the TPMI field) used to indicate the subband codebook in the DCI will also change dynamically, and thus the DCI length will also change dynamically. As the number of subbands increases, the DCI overhead (i.e., length) will also increase, requiring more communication resources to transmit the DCI, resulting in severe communication resource consumption. On the other hand, the non-fixed DCI overhead significantly increases the difficulty and complexity of UE blind DCI detection.

[0078] For the uplink precoding matrix corresponding to the uplink resources indicating the information subband granularity to the terminal device, another possible implementation method is to use two-level DCI to indicate the precoding information of the uplink subband granularity. The first-level DCI is transmitted on the physical downlink control channel (PDCCH), and the second-level DCI is transmitted on the physical downlink shared channel (PDSCH). All the precoding information of the uplink subband granularity is transmitted on the second-level DCI, and the first-level DCI indicates whether the second-level DCI exists and the resource mapping method of the second-level DCI. In this way, the overhead of the first-level DCI is guaranteed to be fixed, avoiding the blind detection pressure of the UE. The two-level DCI is highly flexible and can be used to indicate situations where the number of scheduled subbands in different time slots varies greatly.

[0079] However, using the above approach, the second-level DCI is transmitted on the PDSCH, a dedicated channel without downlink data transmission. Network equipment must use an additional PDCCH to schedule these PDSCH resources. Furthermore, the first-level DCI must indicate (e.g., using a single bit) whether the second-level DCI exists, and must indicate its resource location on the PDSCH and resource mapping method. This still incurs significant overhead for the first-level DCI, requiring more communication resources to transmit, resulting in significant resource consumption.

[0080] In view of this, the present application provides a method for information transmission, which indicates uplink subband precoding through two-level DCI. The first-level DCI on the PDCCH channel only needs to indicate a rate matching parameter, and the rate matching parameter can be used to determine: whether the second-level DCI on the PDSCH exists, and the ratio of the resources occupied by the second DCI to the resources occupied by the PDSCH. The second-level DCI is used to indicate subband precoding information. In other words, when there is downlink data transmission (PDSCH transmission), the subband precoding information can be directly transmitted with the PDSCH, and there is no need to schedule a special PDSCH channel to transmit the second DCI. In addition, the resource mapping method and MCS of the second-level DCI are predefined or preconfigured, and do not require the first-level DCI to indicate. The indication overhead of the first-level DCI indicating whether the second-level DCI exists and the specific resource mapping position is reduced, and the length of the first-level DCI is reduced, so that fewer communication resources are required to send the first-level DCI, reducing the consumption of communication resources.

[0081] To facilitate understanding of the embodiments of the present application, a communication system applicable to the embodiments of the present application is first briefly introduced with reference to FIG1 .

[0082] Exemplarily, FIG1 is a schematic diagram of a communication system to which the method provided in the present application can be applied. The communication system shown in FIG1 includes: a network device 110, a network device 120, and terminal devices 101 to 105. Terminal devices 101 to 103 are within the coverage of network device 110, and terminal devices 104 and 105 are within the coverage of network device 120. Any network device can transmit uplink and downlink data with one or more terminal devices. For example, uplink or downlink control information and data are transmitted through the Uu interface. For example, the transmitted signaling or data may include: a reference signal; DCI, uplink control information (UCI) transmitted on a physical uplink control channel (PUCCH), a radio resource control (RRC) message, uplink data (physical uplink shared channel (PUSCH)), downlink data PDSCH, etc.

[0083] For example, in the example shown in FIG1 , uplink data sent by terminal devices 101 and 102 can be received by network device 110. Uplink data sent by terminal device 105 can be received by network device 120. Uplink data sent by terminal devices 103 and 104 can be received jointly by network devices 110 and 120.

[0084] In the example shown in FIG1 , network devices 110 and 120 can send downlink information to terminal devices 101 to 105. The number of streams (also referred to as spatial streams, spatial layers, data streams, etc.) for uplink transmission from terminal devices 101 to 105 and the precoding matrix used for uplink transmission are calculated by the network device. Network devices 110 and 120 can use the method provided in the embodiments of the present application to indicate to at least one of terminal devices 101 to 105 the uplink precoding matrix corresponding to uplink resources with subband (subbandwidth) granularity.

[0085] Exemplarily, the communication system shown in Figure 1 can be a cellular system related to the Third Generation Partnership Project (3GPP), such as a Global System of Mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD), a Universal Mobile Telecommunication System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a 4G, 5G mobile communication system (including independent networking and non-independent networking), a New Radio (NR), or a future-oriented evolution system (such as a 6G mobile communication system), or an open access network (open RAN, O-RAN or ORAN), a cloud radio access network (cloud The present invention relates to a wireless radio access network (CRAN), a wireless fidelity (WiFi) system, or a communication system that integrates two or more of the above systems. The present invention does not limit this embodiment.

[0086] Optionally, in an embodiment of the present application, the network device may also be referred to as: access network device, wireless access network device, wireless access network (RAN) node, RAN entity or access node, etc., constituting a part of the communication system to help terminal devices achieve wireless access.

[0087] In one possible scenario, a network device can be any device with wireless transceiver capabilities. Examples include: traditional macro base stations (evolved node B, eNBs) in traditional Universal Mobile Telecommunications Systems (UMTS) and LTE communication systems; micro base stations (eNBs) in heterogeneous networks (HetNets); baseband processing units (BBUs) and remote radio units (RRUs) in distributed base station scenarios; baseband pool (BBU pool) RRUs in cloud radio access networks (CRANs); gNBs in future wireless communication systems, 3GPP-derived base stations, access nodes in WiFi systems, wireless relay nodes, wireless backhaul nodes, etc. For example, a base station can be: a macro base station, a micro base station, a pico base station, a small cell, a relay station, or a balloon station.

[0088] In another possible scenario, the network device may be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next-generation base station in a sixth-generation (6G) mobile communication system, a base station in a future mobile communication system, etc. Optionally, the network device may also be a relay node or a host node, or a wireless controller in a CRAN scenario. Optionally, the network device may also be an access network device in V2X technology, such as a road side unit (RSU). All or part of the functions of the network device in this application may also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (such as a cloud platform). The network device in this application may also be a logical node, logical module or software that can implement all or part of the functions of a wireless access network device.

[0089] In NR technology, a network device (e.g., gNB) can consist of a gNB Centralized Unit (CU) and one or more gNB Distributed Units (DU). The gNB-CU and gNB-DU are different logical nodes and can be deployed on different physical devices or on the same physical device.

[0090] Considering a separate control plane and user plane architecture, the gNB-CU can be further divided into a Centralized Unit-Control Plane (CU-CP) entity (also known as a CU-CP node) and a Centralized Unit-User Plane (CU-UP) entity (also known as a CU-UP node). The gNB-CU-CP is a control plane entity responsible for signaling control, while the gNB-CU-UP is a user plane entity responsible for data transmission for terminal devices. The gNB-CU-CP and gNB-CU-UP are connected via the E1 interface, the gNB-CU-CP and gNB-DU are connected via the F1-C interface, and the gNB-CU-UP and gNB-DU are connected via the F1-U interface. Figure 2 shows the architecture of a separate gNB-CU-CP and gNB-CU-UP.

[0091] The architecture shown in Figure 2 also has the following characteristics:

[0092] A gNB consists of one gNB-CU-CP, multiple gNB-CU-UPs, and multiple gNB-DUs.

[0093] A DU can only connect to one gNB-CU-CP;

[0094] A CU-UP can only connect to one gNB-CU-CP;

[0095] A DU can be connected to multiple gNB-CU-UPs under the control of the same CU-CP;

[0096] A CU-UP can be connected to multiple gNB-DUs under the control of the same CU-CP.

[0097] It should be understood that Figure 2 is merely illustrative and does not limit the gNB architecture. For example, in a CU-DU separation or CP-UP separation architecture, a gNB may include only one gNB-CU-UP, one gNB-CU-CP, and one gNB-DU, or may include more gNB-CU-UPs and gNB-DUs. This application does not impose any limitations on this.

[0098] In one possible scenario, for example, the network device may be the aforementioned CU, DU, CU-CP, or CU-UP. The CU and DU may be configured separately or included in the same network element, such as a BBU. The RU may be included in a radio frequency device or radio frequency unit, such as an RRU, an active antenna unit (AAU), or a remote radio head (RRH).

[0099] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in an open access network (open RAN, O-RAN or ORAN) system, CU may also be called O-CU (open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, this application takes CU, CU-CP, CU-UP, DU and RU as examples for description. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0100] For example, Figure 3 shows a schematic diagram of a radio access network device. As shown in Figure 3, the radio access network device includes one or more CUs, one or more DUs, and one or more radio units (RUs). For clarity, Figure 3 shows only one CU, DU, and RU. The CU is used to connect to the core network and one or more DUs. Optionally, the CU can have some of the core network's functions. The CU can include a CU-CP and a CU-UP.

[0101] The CU and DU can be configured according to the protocol layer functions of the wireless network they implement: for example, the CU is configured to implement the functions of the packet data convergence protocol (PDCP) layer and the protocol layers above it (such as the radio resource control (RRC) layer and / or the service data adaptation protocol (SDAP) layer, etc.); the DU is configured to implement the functions of the protocol layers below the PDCP layer (such as the radio link control (RLC) layer, the media access control (MAC) layer, and / or the physical (PHY) layer, etc.). For another example, the CU is configured to implement the functions of the protocol layers above the PDCP layer (such as the RRC layer and / or the SDAP layer), and the DU is configured to implement the functions of the PDCP layer and the protocol layers below it (such as the RLC layer, the MAC layer, and / or the PHY layer, etc.).

[0102] When a CU includes a CU-CP and a CU-UP, the CU-CP is used to implement the control plane functions of the CU, and the CU-UP is used to implement the user plane functions of the CU. For example, when the CU is configured to implement the functions of the PDCP layer, RRC layer, and SDAP layer, the CU-CP is used to implement the RRC layer functions and the control plane functions of the PDCP layer, and the CU-UP is used to implement the SDAP layer functions and the user plane functions of the PDCP layer.

[0103] The CU-CP can interact with network elements in the core network that implement control plane functions. The network elements in the core network that implement control plane functions can be access and mobility function network elements, such as the access and mobility management function (AMF) network element in the 5G system. The access and mobility function network element is responsible for mobility management in the mobile network, such as location update of terminal devices, registration network of terminal devices, and switching of terminal devices.

[0104] The CU-UP can interact with network elements in the core network that implement user plane functions. Network elements in the core network that implement user plane functions, such as the user plane function (UPF) in the 5G system, are responsible for forwarding and receiving data in terminal devices.

[0105] The above configuration of CU and DU is only an example, and the functions of CU and DU can also be configured as needed. For example, the CU or DU can be configured to have the functions of more protocol layers, or the CU or DU can be configured to have partial processing functions of the protocol layer. For example, some functions of the RLC layer and the functions of the protocol layers above the RLC layer are set in the CU, and the remaining functions of the RLC layer and the functions of the protocol layers below the RLC layer are set in the DU. For another example, the functions of the CU or DU can be divided according to the service type or other system requirements, such as by delay, and the functions whose processing time needs to meet the smaller delay requirement are set in the DU, and the functions that do not need to meet the delay requirement are set in the CU.

[0106] The DU and RU can work together to implement the functions of the PHY layer. A DU can be connected to one or more RUs. The functions of the DU and RU can be configured in various ways according to the design. For example, the DU is configured to implement the baseband function, and the RU is configured to implement the mid-RF function. For another example, the DU is configured to implement the high-layer functions in the PHY layer, and the RU is configured to implement the low-layer functions in the PHY layer or to implement the low-layer functions and the RF functions. The high-layer functions in the physical layer may include a part of the functions of the physical layer, which is closer to the MAC layer, and the low-layer functions in the physical layer may include another part of the functions of the physical layer, which is closer to the mid-RF side.

[0107] In the embodiments of the present application, the terminal device may also be referred to as a terminal, user equipment (UE), mobile station, mobile terminal, etc. The terminal can be widely used in various scenarios, such as D2D, V2X communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, etc. The terminal can be a mobile phone, tablet computer, computer with wireless transceiver function, wearable device, vehicle, drone, helicopter, airplane, ship, robot, robotic arm, smart home device, etc. The embodiments of the present application do not limit the device form of the terminal.

[0108] It should be understood that the communication system shown in FIG1 is merely exemplary and should not impose any limitations on the communication systems applicable to the embodiments of the present application. For example, the communication system shown in FIG1 may further include more or fewer terminal devices or network devices, and the network devices or terminal devices included in the communication system shown in FIG1 may be the various forms of network devices or terminal devices described above. The embodiments of the present application are not shown one by one in the figures.

[0109] The following is an exemplary description of the protocol stack structure between the terminal device and the network device.

[0110] The network equipment (also known as radio access network equipment) and terminal devices that communicate with each other have a peer-to-peer protocol layer structure. This protocol layer structure can include protocol layers such as the RRC layer, PDCP layer, RLC layer, MAC layer, and PHY layer. Each layer has a corresponding functional entity to perform its corresponding function. For example, the PDCP layer corresponds to the PDCP entity, and the RLC layer corresponds to the RLC entity. When the network equipment and terminal devices transmit data, the data needs to pass through each protocol layer on the network device and the terminal device in sequence and be processed accordingly at each layer.

[0111] FIG4 is a schematic diagram showing an example of a control plane (or signaling plane) protocol layer structure between a network device and a terminal device.

[0112] As shown in FIG4 , the control plane protocol layer structure between the network device and the terminal device may include functions of protocol layers such as the RRC layer, the PDCP layer, the RLC layer, the MAC layer, and the PHY layer.

[0113] RRC signaling interaction: The RRC layer of the network device is mainly used to send RRC signaling to the RRC layer (i.e., RRC layer entity) of the terminal device. The RRC layer of the terminal device is mainly used to parse the RRC signaling sent by the network device.

[0114] PDCP data exchange: The PDCP layer of a network device is primarily used to send data (e.g., PDCP SDUs) to the PDCP layer (i.e., PDCP layer entity) of a terminal device, or receive data (e.g., PDCP SDUs) sent by the PDCP layer (i.e., PDCP layer entity) of a terminal device. The PDCP layer of a terminal device is primarily used to send data packets (e.g., PDCP SDUs) to the PDCP layer (i.e., PDCP layer entity) of a network device, or receive data packets (e.g., PDCP SDUs) sent by the PDCP layer (i.e., PDCP layer entity) of a network device.

[0115] RLC signaling interaction: The RLC layer of the network device and the terminal device is used to send and receive RLC layer signaling.

[0116] MAC signaling interaction: The MAC layer of network devices and terminal devices is used to send and receive media access control element (MAC CE) signaling.

[0117] PHY signaling and data interaction: The PHY layer of network devices and terminal devices is used to send and receive uplink / downlink control signaling (such as PUCCH / PDCCH) and uplink / downlink data (such as PUSCH / PDSCH).

[0118] It should be understood that the structure of the protocol stack shown in Figure 4 is merely exemplary, and the functions or roles of each protocol layer are also exemplary descriptions and should not impose any restrictions on the functions of the protocol stack or protocol layer of the terminal device and network device provided in the embodiments of the present application.

[0119] The following describes the information transmission method provided by this application with reference to specific examples.

[0120] It should be understood that in the embodiments of the present application, the method is described by taking a network device and a terminal device as the execution subject of the execution method as an example. As an example and not a limitation, the terminal device in the present application may also be a chip, a chip system, or a processor that supports the terminal device to implement the method. The embodiments of the present application are not limited here. The network device in the present application may also be a chip, a chip system, or a processor that supports the network device to implement the method, or it may also be a logical node, a logical module, or software that can implement all or part of the network device functions.

[0121] The method provided in the present application is described in detail below in conjunction with Figure 5. Figure 5 is a schematic flowchart of a method for information transmission in an embodiment of the present application. This method 500 can be applied to the scenarios or communication architectures shown in Figures 1, 3 or 4, and of course can also be applied to other communication scenarios or communication architectures. The embodiments of the present application are not limited here.

[0122] As shown in Fig. 5 , the method 500 shown in Fig. 5 may include S510 to S550. Each step in the method 500 will be described in detail below with reference to Fig. 5 .

[0123] S510: A network device sends a first DCI to a terminal device. The first DCI is carried on a PDCCH channel. The first DCI includes a first parameter, which is used to determine whether a second DCI exists on a PDSCH or at least one of the resources occupied by the second DCI on the PDSCH. The second DCI includes information about an uplink precoding matrix corresponding to uplink resources at a sub-bandwidth (sub-band) granularity.

[0124] Correspondingly, the terminal device receives the first DCI.

[0125] Optionally, in the embodiment of the present application, "the second DCI exists on the PDSCH" may also mean: the second DCI exists on the PDSCH, or the second DCI is transmitted along the PDSCH channel. "The second DCI does not exist on the PDSCH" may also mean: the second DCI does not exist on the PDSCH, or the second DCI is not transmitted along the PDSCH channel.

[0126] Optionally, the information of the uplink precoding matrix corresponding to the uplink resources of the sub-bandwidth (sub-band) may also be referred to as uplink sub-bandwidth (sub-band) precoding information.

[0127] Optionally, in the embodiment of the present application, the first DCI may also be referred to as the first-level DCI, and the second DCI may also be referred to as the second-level DCI. The second DCI or the second-level DCI may also be referred to as control signaling, indication information, or other names. The embodiment of the present application is not limited here.

[0128] In the embodiment of the present application, the first parameter may be a rate matching parameter (for example, represented by α). The first parameter may be used to determine whether the second DCI exists on the PDSCH.

[0129] In some possible implementations of the present application, when the second DCI on the PDSCH exists, the first parameter is also used to determine: the resources occupied by the second DCI on the PDSCH. For example, the first parameter can be used to determine the proportion of the second DCI in the available resources on the PDSCH. It should be understood that since the content transmitted on the PDSCH includes reference signals and downlink data, the PDSCH resources include: the sum of reference signal resources and downlink data transmission resources. The available resources on the PDSCH (or also referred to as PDSCH available resources) can be understood as the resources occupied by downlink data (i.e., downlink data transmission resources). If the second DCI on the PDSCH exists, the resources occupied by the second DCI are the resources for downlink data transmission, that is, the resources occupied by the second DCI are the PDSCH available resources.

[0130] For example, the first parameter is used to determine the ratio of resource elements (REs) occupied by the second DCI to the total REs available for downlink data transmission on the PDSCH.

[0131] Of course, after the proportion of the second DCI in the available resources on the PDSCH is determined, the resources occupied by the second DCI on the PDSCH can be determined based on the proportion of the second DCI in the available resources on the PDSCH. For example, the number of REs occupied by the second DCI on the PDSCH can be determined based on the proportion of the second DCI in the available resources on the PDSCH.

[0132] Optionally, the first parameter may implicitly indicate the condition for whether the second DCI is on the path (i.e., the condition for determining whether the second DCI is on the path). For example, a mapping relationship or a corresponding relationship between the first parameter and the condition for determining whether the second DCI is on the path may be configured or defined in advance. Based on the first parameter and the mapping relationship, it is possible to determine which judgment condition is needed to determine whether the second DCI on the PDSCH exists, and then determine whether the second DCI on the PDSCH exists using the determined judgment condition. For example, the condition for determining whether the second DCI is on the path includes the following formula (1) or formula (2).

[0133] Optionally, in an embodiment of the present application, as a possible implementation method, this state of "the first parameter is included in the first DCI" can be used to indicate that the terminal device needs to determine whether the second DCI exists on the PDSCH.

[0134] In the embodiment of the present application, the second DCI includes: uplink subband precoding information, such as the index of the precoding matrix corresponding to the uplink subband. It is understandable that since the number of subbands scheduled by the terminal device may be multiple, the second DCI may include: precoding information for each of the multiple uplink subbands, such as the index of the precoding matrix corresponding to each uplink subband.

[0135] It should be understood that when the network device determines the uplink subband precoding information, it needs to determine it based on the channel quality between it and the terminal device. Therefore, before the network device determines the uplink subband precoding information (i.e., before generating the second DCI), the terminal device can send an uplink reference signal to the network device for the network device to measure the channel quality. After the network device obtains the channel quality measurement, it can determine the uplink subband precoding information based on the channel quality measurement result, i.e., generate or determine the second DCI.

[0136] It can be understood that no matter whether the second DCI exists on the PDSCH or not, the first DCI includes the first parameter.

[0137] Optionally, as a possible implementation, if the following formula (1) is satisfied, it can be determined that the second DCI exists on the PDSCH (satisfying the associated condition). PDSCH ≥O DCI ×α (1)

[0138] In formula (1), α represents the first parameter (for example, the rate matching parameter), K PDSCH Indicates the number of source bits of downlink data on PDSCH, O DCIIf the above formula (1) is satisfied, the second DCI exists on the PDSCH, that is, the second DCI is transmitted on the PDSCH channel.

[0139] In other words, if the following formula (2) is satisfied, it can also be determined that the second DCI exists on the PDSCH (satisfying the associated condition):

[0140] Formula (2) can be understood as follows: the ratio of the resources required (or occupied) by the second DCI to the available resources of PDSCH is less than or equal to 1. Available resources of PDSCH can be understood as the resources occupied by downlink data on PDSCH excluding reference signals. It may represent: the ratio of the second DCI to the available resources on the PDSCH, for example, the ratio of the second DCI to the number of available REs on the PDSCH.

[0141] It can be understood that formula (1) and formula (2) can be applied to the scenario where there is downlink data on the PDSCH, that is, downlink data is carried or transmitted on the PDSCH.

[0142] It should be understood that the content originally transmitted on the PDSCH includes: reference signals and downlink data. If the second DCI is transmitted on the PDSCH channel, a portion of the communication resources on the PDSCH used to transmit downlink data (i.e., the available resources on the PDSCH) needs to be allocated to transmit the second DCI. In other words, if the second DCI is transmitted on the PDSCH channel, the content transmitted on the PDSCH includes: reference signals, the second DCI, and downlink data. If the second DCI is not transmitted on the PDSCH channel, the content transmitted on the PDSCH includes: reference signals and downlink data.

[0143] For example, the reference signal transmitted (or carried) on the PDSCH may include: a demodulation reference signal (DMRS), a channel state information reference signal (CSI-RS), etc. Of course, in other implementations of the present application, the reference signal transmitted on the PDSCH may also include other types of reference signals, and the embodiments of the present application are not limited thereto.

[0144] From the above formula (1) or formula (2), it can be seen that α can also be used to calculate the rate matching of the second DCI. In other words, when the second DCI is transmitted on the PDSCH channel, α can also be called the rate matching parameter when the second DCI is transmitted on the PDSCH channel.

[0145] Optionally, formula (2) can also be understood as: the ratio of the second DCI to the number of available REs on the PDSCH is less than or equal to 1. It should be understood that the number of available REs on the PDSCH (the number of REs for the overall downlink on the PDSCH) includes: the number of REs occupied by other content on the PDSCH except the reference signal, and the available REs on the PDSCH can be understood as the REs occupied by the downlink data on the PDSCH. In other words, the number of REs occupied by the second DCI cannot exceed (cannot be greater than) the number of REs used to transmit downlink data in the PDSCH. The number of REs used to transmit downlink data in the PDSCH is the number of REs remaining on the PDSCH except the REs occupied by the reference signal.

[0146] By determining whether the second DCI is transmitted along with the PDSCH channel using the above formula (1) or formula (2), on the one hand, when the second DCI is transmitted along with the downlink data on the PDSCH, the downlink data transmission on the PDSCH is ensured not to be affected, thereby improving the efficiency of data transmission. On the other hand, the efficiency and accuracy of determining whether the second DCI is transmitted along with the PDSCH can be improved.

[0147] The efficiency and accuracy of determining whether the second DCI is transmitted on the PDSCH channel can be improved.

[0148] It is understandable that since the network device knows K PDSCH The value of O DCI Therefore, the network device can first determine whether the second DCI is transmitted along the PDSCH channel, for example, based on the priority of the uplink subband precoding or the priority of the downlink data, the resource size occupied by the second DCI, and the resource size occupied by the PDSCH downlink data. If it is determined that the second DCI is transmitted along the PDSCH channel, then a suitable value of α is selected to be carried in the first DCI and sent to the terminal device, and the value of α satisfies the above formula (1) or formula (2). If it is determined that the second DCI is not transmitted along the PDSCH channel, then another suitable value of α is selected to be carried in the first DCI and sent to the terminal device, and the value of α does not satisfy the above formula (1) or formula (2). In other words, before S510, the network device has already determined whether the second DCI is transmitted along the PDSCH channel and the value of the first parameter α.

[0149] If the network device determines that the second DCI needs to be transmitted along with the PDSCH channel, that is, the value of α satisfies the above formula (1) or formula (2), then the second DCI is carried when the PDSCH is sent, that is, the second DCI is transmitted on the PDSCH channel. In this case, the content transmitted by the PDSCH channel includes: a reference signal, the second DCI, and downlink data. If the network device determines that the second DCI does not need to be transmitted along with the PDSCH channel, that is, the value of α does not satisfy the above formula (1) or formula (2), then the second DCI is not carried when the PDSCH is sent. In this case, the content transmitted by the PDSCH channel includes: a reference signal and downlink data.

[0150] Optionally, α can also represent the priority of uplink subband precoding. If the network device deems the current downlink data transmission more important than the uplink subband precoding information, for example, if the uplink subband precoding information calculated for the current timeslot is the same as or not much different from that calculated for the previous timeslot, the uplink subband precoding information indicated by the second DCI is considered unimportant and the uplink subband precoding information from the previous timeslot (e.g., the previous timeslot) can be directly reused. In this case, the uplink subband precoding has a lower priority, while the downlink data has a higher priority. In this case, priority is given to the PDSCH data, meaning that downlink data is preferentially transmitted on the PDSCH. The second DCI is not transmitted on the PDSCH, meaning that it does not occupy REs on the PDSCH. In this case, α can be set to a smaller value. The smaller the value of α, the lower the priority of the uplink subband precoding. If the associated link condition is not met, that is, the second DCI is not transmitted on the PDSCH, the uplink subband precoding information indicated by the second DCI will be sent on the next PDSCH channel that meets the associated link condition or has no downlink data.

[0151] Optionally, the value of α can be calculated based on K PDSCH , O DCI , uplink sub-band precoding priority or downlink data priority, set up a table to retrieve and query, that is, the network equipment can PDSCH , O DCI , uplink subband precoding priority, etc. to determine the value of α.

[0152] It should also be understood that the value of α in the first DCI may be dynamically indicated by the network device. In other words, the values ​​of α in the first DCI sent multiple times by the network device may be different.

[0153] It should be understood that when the second DCI is transmitted on the PDSCH channel, since the content transmitted (or carried) on the PDSCH includes: reference signals, downlink data, and the second DCI, the network device needs to further determine the resources occupied by the second DCI on the PDSCH, for example, determine the number of REs occupied by the second DCI on the PDSCH, so that the second DCI can be mapped on the REs of the PDSCH.

[0154] Optionally, as a possible implementation, the network device may determine the number of available REs occupied by the second DCI on the PDSCH (the number of REs occupied by the second DCI on the PDSCH) by calculating the result using the following formula (3):

[0155] In formula (3), S represents the number of REs occupied by the second DCI on the PDSCH, that is, the number of available REs occupied by the second DCI on the PDSCH, and M represents the number of available REs on the PDSCH, that is, the number of REs occupied by downlink data on the PDSCH, or the number of REs occupied by other content on the PDSCH excluding reference signals. The meanings of the other letters in formula (3) are the same as those in formula (1) or formula (2) and are not repeated here.

[0156] It can be understood that formula (3) can be applied to the scenario where there is downlink data on the PDSCH, that is, the PDSCH carries or transmits downlink data.

[0157] By using the above formula (3), the number of available REs occupied by the second DCI on the PDSCH is determined, i.e., the resources occupied by the second DCI on the PDSCH are determined. On the one hand, when the second DCI is transmitted along with downlink data on the PDSCH, downlink data transmission on the PDSCH is not affected, thereby improving data transmission efficiency. On the other hand, the efficiency and accuracy of determining the number of available REs occupied by the second DCI on the PDSCH can be improved.

[0158] After the network device determines the number of REs occupied by the second DCI on the PDSCH, it can map the second DCI on the PDSCH according to the number of REs occupied by the second DCI on the PDSCH, the mapping method of the RE resources of the second DCI, and the MCS of the second DCI.

[0159] It should also be understood that, when the second DCI is transmitted on the PDSCH channel, the resource mapping mode and modulation and coding scheme (MCS) of the second DCI can be predefined or preconfigured. In other words, the resource mapping mode and MCS of the second DCI can be default. In this way, the network device does not need to use additional fields or signaling in the first DCI to indicate the resource mapping mode and MCS of the second DCI to the terminal device, which can further reduce the overhead of the first DCI, that is, reduce the length of the first DCI, thereby reducing the communication resources used to transmit the first DCI, further reducing the consumption of communication resources, and improving the efficiency of communication resource utilization.

[0160] Because the resource mapping method and MCS of the second DCI are predefined or preconfigured, the network device and the terminal device are aware of the resource mapping method and MCS of the second DCI. Furthermore, the network device and the terminal device have the same understanding of the resource mapping method and MCS of the second DCI, that is, the terminal device and the network device use the same resource mapping method of the second DCI and the same MCS of the second DCI.

[0161] Optionally, in the embodiments of the present application, predefined may be understood as defined by the protocol. Preconfigured may be understood as configured by signaling, which may include configuration by higher layer or physical layer signaling. Higher layer signaling may include, for example, RRC signaling, MAC CE, RLC signaling, etc. Physical layer signaling may include, for example, DCI, signaling transmitted via a downlink physical layer channel, such as a PDCCH or PDSCH.

[0162] Optionally, as a possible implementation, the resource mapping method of the second DCI may be: mapping starting from the first RE that does not contain a reference signal symbol (hereinafter, the reference signal is described using DMRS as an example) on the PDSCH, for example, mapping starting from the first RE that does not contain a DMRS symbol on the PDSCH. With this mapping method, the second DCI is closer to the DMRS, which can improve the accuracy of the second DCI decoding and the efficiency of the second DCI transmission.

[0163] Of course, in other implementations of the present application, the resource mapping method of the second DCI can also be other methods, such as starting mapping from the second or third RE that does not contain DMRS symbols on the PDSCH, etc., and the embodiments of the present application are not limited here.

[0164] Optionally, as a possible implementation method, when the second DCI needs to be transmitted on the PDSCH channel, the MCS of the second DCI can be the same as the MCS of the downlink data transmitted on the PDSCH. In this way, it is convenient to rate match the second DCI and the downlink data on the PDSCH, thereby reducing the complexity of rate matching the second DCI and the downlink data on the PDSCH and making it easy to implement.

[0165] Of course, in other implementations of the present application, the MCS of the second DCI may also be other MCSs. For example, the MCS of the second DCI may also be different from the MCS of the downlink data transmitted on the PDSCH. This embodiment of the present application does not limit this.

[0166] When the network device determines that the second DCI needs to be transmitted on the PDSCH channel, the network device can map the second DCI on the PDSCH based on the number of REs occupied by the second DCI on the PDSCH, the mapping method of the RE resources of the second DCI, and the MCS of the second DCI, so that the second DCI can be sent to the terminal device on the PDSCH.

[0167] S520, the terminal device determines whether the second DCI exists on the PDSCH according to the first parameter included in the first DCI, and, if the second DCI exists on the PDSCH, determines the resources occupied by the second DCI on the PDSCH according to the first parameter.

[0168] Optionally, as a possible implementation, the state of "the first DCI includes the first parameter" can be used to indicate that the terminal device needs to determine whether the second DCI exists on the PDSCH. After the terminal device receives the first DCI and finds that the first DCI includes the first parameter, the terminal device can determine that it needs to determine whether the second DCI exists on the PDSCH.

[0169] In the case where a terminal device needs to determine whether a second DCI exists on a PDSCH, one possible implementation method is: the first parameter can implicitly indicate a judgment condition for whether the second DCI exists on the PDSCH. In other words, there is a mapping relationship or a corresponding relationship between the first parameter and the judgment condition for whether the second DCI exists on the PDSCH. The terminal device can determine which judgment condition to use to determine whether the second DCI exists on the PDSCH based on the value of the first parameter and the mapping relationship. For example, the judgment condition for whether the second DCI exists on the PDSCH includes the above-mentioned formula (1) or formula (2).

[0170] Optionally, the terminal device may also determine whether the second DCI exists on the PDSCH (whether the associated condition is met) according to the above formula (1) or formula (2). If the above formula (1) or formula (2) is satisfied, that is, the associated condition is satisfied, the terminal device can determine that the second DCI exists on the PDSCH, that is, the second DCI is transmitted on the PDSCH channel. If the above formula (1) or formula (2) is not satisfied, that is, the associated condition is not satisfied, the terminal device can determine that the second DCI does not exist on the PDSCH, that is, the second DCI is not transmitted on the PDSCH channel.

[0171] It should be understood that the terminal device can determine the above O DCI Parameters and K PDSCH For example, the terminal device can calculate the number of bits to be transmitted based on the configured MCS and bandwidth. DCI and K PDSCH α is indicated by the first DCI, so the terminal device can obtain the values ​​of the three parameters, and thus determine whether the second DCI exists on the PDSCH (whether the accompanying conditions are met) according to the above formula (1) or formula (2).

[0172] In the case where the terminal device needs to determine whether the second DCI exists on the PDSCH, another possible implementation method is: the judgment method for whether the accompanying conditions are met can also be predefined or preconfigured, for example, the above formula (1) and formula (2) can be predefined or preconfigured. In other words, the terminal device knows in advance which judgment method is used to judge whether the second DCI exists on the PDSCH. In addition, the terminal device and the network device have the same understanding of which judgment method is used to judge whether the second DCI exists on the PDSCH, that is, the terminal device and the network device use the same judgment method (for example, the above formula (1) and formula (2)) to judge whether the second DCI exists on the PDSCH.

[0173] When the terminal device determines that the second DCI is transmitted on the PDSCH channel, the terminal device can further determine the resources occupied by the second DCI on the PDSCH, for example, determine the number of available REs occupied by the second DCI on the PDSCH ("the number of available REs occupied by the second DCI on the PDSCH" is a specific expression of "the resources occupied by the second DCI on the PDSCH"), so that the terminal device can accurately demodulate the second DCI mapped on the PDSCH.

[0174] In the case where the terminal device needs to determine the resources occupied by the second DCI on the PDSCH, a possible implementation method is: the first parameter may also implicitly indicate the calculation method of the resources occupied by the second DCI on the PDSCH, for example, the first parameter may also implicitly indicate the calculation method of the number of available REs of the PDSCH occupied by the second DCI (for example, the above formula (3)). In other words, the mapping relationship or correspondence between the first parameter and the calculation method of the resources occupied by the second DCI on the PDSCH can be configured or defined in advance. The terminal device can determine the calculation method of the resources occupied by the second DCI on the PDSCH based on the value of the first parameter and the mapping relationship.

[0175] For example, the terminal device may also determine the number of available REs occupied by the second DCI in the PDSCH according to the above formula (3). The value of M in formula (3) can be determined by the terminal device itself. For example, the terminal device may obtain M by decoding the PDCCH that schedules the PDSCH (because the PDCCH indicates the resource allocation of the PDSCH, including the number of REs occupied by downlink data transmission).

[0176] As another possible implementation, the calculation method for determining the resources occupied by the second DCI on the PDSCH (for example, the number of PDSCH available REs occupied by the second DCI) can be predefined or preconfigured. For example, the above formula (3) can be predefined or preconfigured. That is, the terminal device knows in advance the implementation method for the purpose of determining the number of PDSCH available REs occupied by the second DCI. Moreover, the terminal device and the network device have the same understanding of which method to use to determine the number of PDSCH available REs occupied by the second DCI, that is, the terminal device and the network device use the same method to determine the number of PDSCH available REs occupied by the second DCI.

[0177] When the terminal device determines that the second DCI is transmitted on the PDSCH channel, since the resource mapping mode and MCS of the second DCI are predefined or preconfigured, the terminal device can accurately demodulate the second DCI mapped on the PDSCH based on the resource mapping mode, MCS, and the number of available REs occupied by the second DCI on the PDSCH.

[0178] S530, when the second DCI needs to be transmitted on the PDSCH channel, the network device sends the second DCI to the terminal device, the second DCI is carried on the PDSCH channel, and the second DCI includes: information about the uplink precoding matrix corresponding to the uplink resources with sub-bandwidth (sub-band) granularity.

[0179] Correspondingly, the second terminal device receives the second DCI on the PDSCH channel.

[0180] It can be understood that in S530, the content transmitted on the PDSCH includes: a reference signal, a second DCI, and downlink data.

[0181] S540, the terminal device demodulates the second DCI mapped on the PDSCH according to the resource mapping mode of the second DCI, MCS and the resources occupied by the second DCI on the PDSCH, and obtains the uplink precoding matrix information corresponding to the uplink resources with sub-bandwidth (sub-band) granularity.

[0182] As described above, since the resource mapping mode and MCS of the second DCI are predefined or preconfigured, the terminal device can know the resource mapping mode and MCS of the second DCI. Moreover, the number of available REs occupied by the second DCI on the PDSCH can be determined based on the first parameter. Thus, the second DCI is demodulated on the PDSCH using the resource mapping mode of the second DCI, the MCS of the second DCI, the resources occupied by the second DCI on the PDSCH (for example, the number of available REs occupied by the second DCI on the PDSCH), etc., to obtain the information of the uplink precoding matrix corresponding to the uplink resources of the sub-bandwidth (sub-band) granularity, for example, the index of the uplink precoding matrix corresponding to the uplink resources of each sub-bandwidth (sub-band) granularity is obtained, so that the uplink precoding matrix corresponding to the uplink resources of each sub-bandwidth (sub-band) granularity can be determined.

[0183] Optionally, in other implementations of the present application, if the subband precoding information (the information of the uplink precoding matrix corresponding to the uplink resources with subband granularity) does not meet the accompanying conditions, that is, the subband precoding information cannot be sent together with the downlink data on the PDSCH, and the network device still needs to send this part of the subband precoding information, the network device can additionally or specifically use a PDCCH to schedule a PDSCH to only transmit the uplink precoding information. There is no downlink data transmission on this PDSCH, only the second DCI is transmitted, and the second DCI includes subband precoding information. In other words, the content transmitted on the PDSCH includes: a reference signal and a second DCI. In this case, the value of α in the first DCI can be predefined or preconfigured. Assuming that the predefined or preconfigured value of α is a first value, the first value can be used to indicate that no downlink data is carried or transmitted on the PDSCH, and only the second DCI is carried. After the terminal device receives the first DCI, if it is determined that the value of α is the first value, the terminal device can determine that there is no downlink data on the PDSCH and only the second DCI is transmitted.

[0184] Optionally, when the value of α is the first value, the resource mapping mode and / or MCS of the second DCI may also be predefined or preconfigured.

[0185] Optionally, if the terminal device determines that the value of α is not the first value, in this case, the terminal device may determine that the PDSCH channel carries or transmits downlink data. Further, the terminal device may determine whether the second DCI on the PDSCH channel exists according to the above method (S520).

[0186] Optionally, a mapping relationship or correspondence between the value of α and the transmission state of "no downlink data is carried on the PDSCH, only the second DCI is carried" can be configured or defined in advance. Based on the value of α and the mapping relationship, the terminal device can determine that the transmission state is that the PDSCH does not carry downlink data, but only the second DCI is carried. For example, when the value of α is configured or defined in advance as the first value, the transmission state is: no downlink data is carried on the PDSCH, but only the second DCI is carried, and the second DCI includes subband precoding information.

[0187] When the value of α is the first value, the network device can map the second DCI on the PDSCH according to the resource mapping mode of the second DCI and the MCS of the second DCI, so that the second DCI can be sent to the terminal device on the PDSCH, and the PDSCH does not include downlink data. The terminal device can call out the second DCI mapped on the PDSCH according to the resource mapping mode and MCS of the second DCI, and obtain information about the uplink precoding matrix corresponding to the uplink resources with sub-bandwidth (sub-band) granularity.

[0188] Optionally, the method 500 may further include S550:

[0189] S550, the terminal device precodes the data on each subband according to the uplink precoding matrix corresponding to the uplink resource of each subband (subband) granularity using the uplink precoding matrix corresponding to each subband, and sends the precoded uplink data to the network device.

[0190] For example, the uplink data transmitted on each subband can be scheduled by the network device through downlink signaling sent on the PDCCH. Through the scheduling of the network device, the terminal device can determine on which time-frequency resources the uplink data needs to be sent to the network device. The terminal device uses the first DCI and the second DCI sent by the network device to determine the uplink precoding matrix corresponding to each subband. In addition, the terminal device can determine the channel quality or channel measurement results between the terminal device and the network device, and can use the uplink precoding matrix corresponding to each subband to precode the data on each subband based on the channel measurement results and the uplink precoding matrix corresponding to each subband, and send the precoded uplink data to the network device on the PUCCH or PUSCH channel.

[0191] The information transmission method provided by this application uses two-level DCI to indicate uplink precoding. When there is downlink data transmission (PDSCH), the uplink subband precoding indication information can be placed on the PDSCH and transmitted along with the downlink data. The starting position of the resource mapping method of the second-level DCI and the MCS are set by default. The first-level DCI on the PDCCH only needs to dynamically indicate a rate matching parameter, and does not need to indicate the starting position of the resource mapping method of the second-level DCI and the MCS. The rate matching parameter implicitly indicates the accompanying conditions, that is, implicitly indicates whether the second-level DCI on the PDSCH exists, the specific location of the resource mapping of the REs occupied by the second-level DCI (for example, the proportion of the second-level DCI resources in the available PDSCH resources, or the number of available PDSCH REs occupied by the second-level DCI), and the calculation of rate matching. This reduces the indication overhead of the first-level DCI indicating whether the second-level DCI exists and the specific resource mapping location, and reduces the length of the first-level DCI, thereby requiring fewer communication resources to transmit the first-level DCI and reducing communication resource consumption.

[0192] It should be understood that the above is only intended to help those skilled in the art better understand the embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application. Based on the above examples given, those skilled in the art can obviously make various equivalent modifications or changes. For example, some steps in the above method embodiments may not be necessary, or some new steps may be added. Or a combination of any two or any multiple embodiments described above. Such modifications, changes, or combined solutions also fall within the scope of the embodiments of the present application.

[0193] It should also be understood that the division of the modes, situations, categories and embodiments in the embodiments of the present application is only for the convenience of description and should not constitute a special limitation. The features of various modes, categories, situations and embodiments can be combined without contradiction.

[0194] It should also be understood that the various numerical numbers involved in the embodiments of this application are only for the convenience of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0195] It should also be understood that the above description of the embodiments of the present application focuses on emphasizing the differences between the various embodiments. The same or similar points that are not mentioned can be referenced with each other. For the sake of brevity, they will not be repeated here.

[0196] The method of the embodiment of the present application is described in detail above with reference to Figures 1 to 5. The communication device of the embodiment of the present application is described in detail below with reference to Figures 6 to 11.

[0197] In this embodiment, terminal devices and network devices can be divided into functional modules according to the above method. For example, each function can be divided into separate functional modules, or two or more functions can be integrated into a single processing module. The integrated modules can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and represents only a logical functional division. In actual implementation, other division methods may be used.

[0198] It should be noted that the relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0199] The terminal device and network device provided in the embodiments of the present application are used to perform any of the information transmission methods provided in the above method embodiments, and thus can achieve the same effect as the above implementation method. In the case of an integrated unit, the terminal device or network device may include a processing module, as well as an optional storage module and a communication module. Among them, the processing module can be used to control and manage the actions of the terminal device or network device. For example, it can be used to support the terminal device or network device to execute the steps performed by the processing unit. The storage module can be used to support the storage of program code and data, etc. The communication module can be used to support communication between the terminal device or network device and other devices.

[0200] The processing module may be a processor or a controller. It may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, and so on. The storage module may be a memory. The communication module may specifically be a device that interacts with other electronic devices, such as a radio frequency circuit, a Bluetooth chip, or a Wi-Fi chip.

[0201] For example, Figure 6 shows a schematic block diagram of a communication device 600 of an embodiment of the present application. The communication device 600 may correspond to the network device described in the above method 500, or may be a chip or component applied to the network device. Moreover, each module or unit in the communication device 600 is used to execute each action or processing process performed by any network device in the above method 500.

[0202] As shown in Figure 6, the device 600 may include a processing unit 610 and a transceiver unit 620. The transceiver unit 620 is configured to perform specific signal transmission and reception under the control of the processing unit 610. The processing unit may also be referred to as a processing module, and the transceiver unit may also be referred to as a communication unit.

[0203] The transceiver unit 620 is configured to: send a first DCI, where the first DCI is carried on a PDCCH channel, the first DCI including a first parameter, the first parameter being used to determine whether a second DCI exists on a PDSCH channel, or at least one of the resources occupied by the second DCI on the PDSCH, the second DCI including: information about an uplink precoding matrix corresponding to uplink resources at a subband granularity;

[0204] The transceiver unit 620 is further configured to: send downlink data, send downlink data and the second DCI, or send the second DCI on the PDSCH channel.

[0205] The communication device provided by the present application uses two-level DCI to indicate uplink precoding. When there is downlink data transmission (PDSCH), the indication information of the uplink subband precoding can be placed on the PDSCH and transmitted together with the downlink data. The first-level DCI on the PDCCH only needs to dynamically indicate a rate matching parameter (first parameter), and does not need to indicate the starting position of the resource mapping method of the second-level DCI and the MCS, etc. The rate matching parameter implicitly indicates the accompanying conditions, that is, implicitly indicates whether the second-level DCI on the PDSCH exists, the resources occupied by the second DCI on the PDSCH (for example, the proportion of the second DCI resources to the available resources of the PDSCH, or the number of available REs occupied by the second DCI on the PDSCH), and the calculation of rate matching, etc. This reduces the indication overhead of the first-level DCI indicating whether the second-level DCI exists and the specific resource mapping location, reduces the length of the first-level DCI, and thus requires fewer communication resources to send the first-level DCI, thereby reducing the consumption of communication resources.

[0206] In some possible implementations, the resource mapping mode and / or MCS of the second DCI is predefined or preconfigured.

[0207] In some possible implementations, the resource mapping method of the second DCI includes: mapping starting from the first RE that does not contain a reference signal symbol on the PDSCH.

[0208] In some possible implementations, when downlink data and the second DCI exist on the PDSCH, the MCS of the second DCI is the same as the MCS of the downlink data transmitted on the PDSCH.

[0209] In some possible implementations, downlink data exists on the PDSCH. When the following conditions are met, the processing unit 610 determines that the second DCI exists on the PDSCH:

[0210] K PDSCH ≥O DCI ×α; or

[0211] Among them, α represents the first parameter, K PDSCH Indicates the number of source bits of downlink data on PDSCH, O DCI Indicates the number of source bits of the second DCI.

[0212] In some possible implementations, when downlink data and the second DCI are present on the PDSCH, the resources occupied by the second DCI on the PDSCH include: the number of REs occupied by the second DCI on the PDSCH, and the processing unit 610 determines the number of REs occupied by the second DCI on the PDSCH according to the following conditions:

[0213] S represents the number of REs occupied by the second DCI on PDSCH, M represents the number of REs available on PDSCH, α represents the first parameter, and K PDSCH Indicates the number of source bits of downlink data on PDSCH, O DCI Indicates the number of source bits of the second DCI.

[0214] In some possible implementations, when the value of the first parameter is the first value, the first value of the first parameter is used to indicate that the second DCI of the PDSCH channel exists and the PDSCH channel does not transmit downlink data.

[0215] In some possible implementations, when the value of the first parameter is not the first value, the value of the first parameter is used to indicate that the PDSCH channel transmits downlink data.

[0216] It should be understood that the specific process of each unit in the communication device 600 executing the above corresponding steps can be referred to the description of the network device in conjunction with the relevant embodiment of the method 500 in the above text. For the sake of brevity, it is not repeated here.

[0217] Optionally, the transceiver unit 620 may include a receiving unit (module) and a sending unit (module), configured to execute the steps of the network device receiving information and sending information in the embodiment of the aforementioned method 500 .

[0218] Furthermore, the communication device 600 may also include a storage unit. The transceiver unit 620 may be a transceiver, an input / output interface, or an interface circuit. The storage unit is used to store instructions executed by the transceiver unit 620 and the processing unit 610. The transceiver unit 620, the processing unit 610, and the storage unit are coupled to each other. The storage unit stores instructions, the processing unit 610 is used to execute the instructions stored in the storage unit, and the transceiver unit 620 is used to perform specific signal transmission and reception under the control of the processing unit 610.

[0219] It should be understood that the transceiver unit 620 may be a transceiver, an input / output interface, or an interface circuit. The storage unit may be a memory. The processing unit 610 may be implemented by a processor. As shown in FIG7 , the communication device 700 may include a processor 710, a memory 720, and a transceiver 730.

[0220] The communication device 600 shown in FIG6 or the communication device 700 shown in FIG7 can implement the steps performed by the network device in the aforementioned method 500. Similar descriptions can refer to the descriptions in the aforementioned corresponding methods. To avoid repetition, they are not repeated here.

[0221] It should also be understood that the communication device 600 shown in FIG. 6 or the communication device 700 shown in FIG. 7 may be a network device, or a network device may include the communication device 600 shown in FIG. 6 or the communication device 700 shown in FIG. 7 .

[0222] For example, Figure 8 shows a schematic block diagram of a communication device 800 of an embodiment of the present application. The communication device 800 may correspond to the terminal device described in the above method 500, or may be a chip or component applied to the terminal device. Moreover, each module or unit in the communication device 800 is used to execute each action or processing process performed by the terminal device in any one of the above methods 500.

[0223] As shown in FIG8 , the communication device 800 includes a transceiver unit 810 and a processing unit 820. The transceiver unit 810 is configured to perform specific signal transmission and reception under the control of the processing unit 820.

[0224] Among them, the transceiver unit 810 is used to: receive a first DCI, the first DCI is carried on the PDCCH channel, the first DCI includes a first parameter, the first parameter is used to determine whether a second DCI exists on the PDSCH channel, or at least one of the resources occupied by the second DCI on the PDSCH, the second DCI includes: information on the uplink precoding matrix corresponding to the uplink resources with sub-band granularity.

[0225] The processing unit 820 is configured to determine, according to the first parameter, whether the second DCI exists on the PDSCH channel or at least one of the resources occupied by the second DCI on the PDSCH.

[0226] The transceiver unit 810 is further configured to receive downlink data, downlink data and the second DCI, or the second DCI on the PDSCH channel.

[0227] The communication device provided by the present application can receive uplink subband precoding indication information (i.e., second-level DCI) and downlink data together on the PDSCH during uplink and downlink data transmission on the PDSCH. The first-level DCI received on the PDCCH only needs to dynamically indicate a rate matching parameter (first parameter). The rate matching parameter implicitly indicates the accompanying conditions, i.e., implicitly indicates whether the second-level DCI on the PDSCH exists and the resources occupied by the second DCI on the PDSCH. This reduces the indication overhead of the first-level DCI indicating whether the second-level DCI exists and the specific resource mapping location, reduces the length of the first-level DCI, and thus requires fewer communication resources to send the first-level DCI, thereby reducing the consumption of communication resources.

[0228] In some possible implementations, the resource mapping mode and / or MCS of the second DCI is predefined or preconfigured.

[0229] In some possible implementations, the resource mapping method of the second DCI includes: mapping starting from the first RE that does not contain a reference signal symbol on the PDSCH.

[0230] In some possible implementations, the MCS of the second DCI is the same as the MCS of the downlink data transmitted on the PDSCH.

[0231] In some possible implementations, downlink data and the second DCI exist on the PDSCH. When the following conditions are met, the processing unit 820 determines that the second DCI exists on the PDSCH:

[0232] K PDSCH ≥O DCI ×α; or

[0233] Among them, α represents the first parameter, K PDSCH Indicates the number of source bits of downlink data on PDSCH, O DCI Indicates the number of source bits of the second DCI.

[0234] In some possible implementations, when downlink data and a second DCI are present on the PDSCH, the resources occupied by the second DCI on the PDSCH include: the number of REs occupied by the second DCI on the PDSCH, and the processing unit 820 determines the number of REs occupied by the second DCI on the PDSCH according to the following conditions:

[0235] S represents the number of REs occupied by the second DCI on PDSCH, M represents the number of REs available on PDSCH, α represents the first parameter, and K PDSCH Indicates the number of source bits of downlink data on PDSCH, O DCIIndicates the number of source bits of the second DCI.

[0236] In some possible implementations, the processing unit 820 is further configured to: when the value of the first parameter is the first value, determine that the second DCI of the PDSCH channel exists, and the PDSCH channel has no downlink data transmission.

[0237] In some possible implementations, the processing unit 820 is further configured to: when the value of the first parameter is not the first value, determine that there is downlink data transmission on the PDSCH channel.

[0238] In some possible implementations, the processing unit 820 is further configured to: demodulate the second DCI on the PDSCH channel according to the resource mapping mode of the second DCI, the MCS of the second DCI, and the resources occupied by the second DCI on the PDSCH.

[0239] Furthermore, the communication device 800 may also include a storage unit, and the transceiver unit 810 may be a transceiver, an input / output interface, or an interface circuit. The storage unit is used to store instructions executed by the transceiver unit 810 and the processing unit 820. The transceiver unit 810, the processing unit 820, and the storage unit are coupled to each other. The storage unit stores instructions, the processing unit 820 is used to execute the instructions stored in the storage unit, and the transceiver unit 810 is used to perform specific signal transmission and reception under the control of the processing unit 820.

[0240] It should be understood that the specific process of each unit in the communication device 800 executing the above corresponding steps can be referred to the description of the terminal device in the relevant embodiment of the method 500 in the previous text. For the sake of brevity, it is not repeated here.

[0241] It should be understood that the transceiver unit 810 may be a transceiver, an input / output interface, or an interface circuit. The storage unit may be a memory. The processing unit 820 may be implemented by a processor.

[0242] For example, as shown in FIG9 , a communication device 900 may include a processor 910, a memory 920, a transceiver 930, and a bus system 940. The various components of the communication device 900 are coupled together via the bus system 940. In addition to a data bus, the bus system 940 may also include a power bus, a control bus, and a status signal bus. However, for clarity, FIG9 illustrates various busses as the bus system 940. For ease of illustration, FIG9 is merely a schematic representation.

[0243] The communication device 800 shown in FIG8 or the communication device 900 shown in FIG9 can implement the steps performed by the terminal device in the aforementioned method 500. Similar descriptions can refer to the descriptions of the aforementioned corresponding methods. To avoid repetition, they are not repeated here.

[0244] It should also be understood that the communication device 800 shown in FIG. 8 or the communication device 900 shown in FIG. 9 may be a terminal device, or the terminal device may include the communication device 800 shown in FIG. 8 or the communication device 900 shown in FIG. 9 .

[0245] It should also be understood that the division of units in the above device is merely a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. Moreover, the units in the device can all be implemented in the form of software called through processing elements; or all be implemented in the form of hardware; or some units can be implemented in the form of software called through processing elements, and some units can be implemented in the form of hardware. For example, each unit can be a separately established processing element, or it can be integrated into a certain chip of the device. In addition, it can also be stored in a memory in the form of a program, and called by a certain processing element of the device to execute the function of the unit. Here, the processing element can also be called a processor, which can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each unit above can be implemented by the integrated logic circuit of the hardware in the processor element or in the form of software called through the processing element.

[0246] In one example, the unit in any of the above devices may be one or more integrated circuits configured to implement the above method, such as one or more application specific integrated circuits (ASICs), one or more DSPs, one or more field programmable gate arrays (FPGAs), or a combination of at least two of these integrated circuit forms. For another example, when the unit in the device can be implemented in the form of a processing element scheduler, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call a program. For another example, these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0247] Figure 10 is a schematic diagram of the structure of a terminal device 1000 provided in this application. The above-mentioned communication device 800 or communication device 900 can be configured in the terminal device 1000. Alternatively, the communication device 800 or communication device 900 itself can be the terminal device 1000. In other words, the terminal device 1000 can perform the actions performed by the terminal device in any of the methods 500 described above. Optionally, for ease of explanation, Figure 10 only shows the main components of the terminal device. As shown in Figure 10, the terminal device 1000 includes a processor, memory, control circuitry, an antenna, and input / output devices.

[0248] The processor is primarily used to process communication protocols and communication data, control the entire terminal device, execute software programs, and process software program data, for example, to support the terminal device in performing the actions described in the above-mentioned information transmission method embodiments. The memory is primarily used to store software programs and data, such as the downlink data described in the above-mentioned embodiments, and information about the uplink precoding matrix corresponding to sub-band uplink resources. The control circuit is primarily used to convert baseband signals into RF signals and process RF signals. The control circuit and antenna together can also be referred to as a transceiver, primarily used to transmit and receive RF signals in the form of electromagnetic waves. For example, this includes receiving the first DCI and the second DCI on the PDSCH described in the above-mentioned embodiments, as well as the second DCI on the PDSCH and downlink data. Input / output devices, such as a touch screen, display, and keyboard, are primarily used to receive user input and output data to the user.

[0249] When the terminal device is turned on, the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the RF circuit. The RF circuit performs RF processing on the baseband signal and then sends the RF signal outward in the form of electromagnetic waves through the antenna. When data (such as the first DCI mentioned above and the second DCI on the PDSCH, etc.) is sent to the terminal device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data.

[0250] Those skilled in the art will appreciate that, for ease of explanation, FIG10 shows only one memory and processor. In an actual terminal device, multiple processors and memories may exist. The memory may also be referred to as a storage medium or storage device, etc., which is not limited in the present embodiment.

[0251] For example, a processor may include a baseband processor and a central processing unit (CPU). The baseband processor is primarily responsible for processing communication protocols and communication data, while the CPU is primarily responsible for controlling the entire terminal device, executing software programs, and processing data from software programs. The processor in Figure 10 integrates the functions of both the baseband processor and the CPU. Those skilled in the art will appreciate that the baseband processor and the CPU may also be independent processors interconnected via a bus or other technology. Those skilled in the art will appreciate that a terminal device may include multiple baseband processors to accommodate different network standards, multiple CPUs to enhance its processing capabilities, and that the various components of the terminal device may be connected via various buses. The baseband processor may also be referred to as a baseband processing circuit or a baseband processing chip. The CPU may also be referred to as a central processing circuit or a central processing chip. The functionality for processing communication protocols and communication data may be built into the processor or stored as a software program in a storage unit, with the processor executing the software program to implement the baseband processing functionality.

[0252] By way of example, in an embodiment of the present application, an antenna and a control circuit having transceiver functions may be regarded as a transceiver unit 1001 of the terminal device 1000, and a processor having a processing function may be regarded as a processing unit 1002 of the terminal device 1000. As shown in FIG10 , the terminal device 1000 includes a transceiver unit 1001 and a processing unit 1002. The transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver device, etc. Optionally, the device for implementing the receiving function in the transceiver unit 1001 may be regarded as a receiving unit, and the device for implementing the transmitting function in the transceiver unit 1001 may be regarded as a transmitting unit, that is, the transceiver unit 1001 includes a receiving unit and a transmitting unit. By way of example, the receiving unit may also be referred to as a receiver, a receiver, a receiving circuit, etc., and the transmitting unit may be referred to as a transmitter, a transmitter, or a transmitting circuit, etc.

[0253] Figure 11 is a structural diagram of a network device 1100 provided in an embodiment of the present application, which can be used to implement the functions of the network device in the above method. The network device 1100 includes one or more radio frequency units, such as a remote radio unit (RRU) 1101 and one or more baseband units (BBU) (also known as digital units, DU) 1102. The RRU 1101 can be called a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and may include at least one antenna 11011 and a radio frequency unit 11011. The RRU 1101 part is mainly used for transmitting and receiving radio frequency signals and converting radio frequency signals into baseband signals, for example, for sending multiple groups of data streams and indication information in the above embodiment to terminal devices. The BBU 1102 part is mainly used for baseband processing, controlling the base station, etc. The RRU 1101 and BBU 1102 can be physically set together or physically separated, that is, a distributed base station.

[0254] The BBU 1102 is the control center of the base station, which can also be called a processing unit. It is mainly used to perform baseband processing functions such as channel coding, multiplexing, modulation, spread spectrum, etc. For example, the BBU (processing unit) 1102 can be used to control the base station to execute the operation process of the network device in the above method embodiment.

[0255] In one example, the BBU 1102 may be composed of one or more boards. Multiple boards may jointly support a wireless access network of a single access standard (such as an LTE system or a 5G system), or may separately support wireless access networks of different access standards. The BBU 1102 also includes a memory 11021 and a processor 11022. The memory 11021 is used to store necessary instructions and data. For example, the memory 11021 stores information such as the first DCI in the above embodiment and the uplink precoding matrix corresponding to the uplink resources with subband granularity. The processor 11022 is used to control the base station to perform necessary actions, such as controlling the base station to execute the operation process of the network device in the above method embodiment. The memory 11021 and the processor 11022 may serve one or more boards. That is, a memory and a processor may be separately provided on each board. Alternatively, multiple boards may share the same memory and processor. In addition, necessary circuits may be provided on each board.

[0256] In one possible implementation, with the development of system-on-chip (SoC) technology, all or part of the functions of parts 1102 and 1101 can be implemented using SoC technology. For example, they can be implemented using a base station function chip that integrates a processor, memory, antenna interface, and other components. Programs for base station-related functions are stored in the memory, and the processor executes the programs to implement the base station-related functions. Optionally, the base station function chip can also read memory external to the chip to implement the base station-related functions.

[0257] It should be understood that the structure of the network device illustrated in FIG11 is only one possible form and should not constitute any limitation to the embodiments of the present application. The present application does not exclude the possibility of other forms of base station structures that may appear in the future.

[0258] It should be understood that in the embodiments of the present application, the processor may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0259] It should also be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an EPROM, an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0260] An embodiment of the present application also provides a communication system, which includes: the above-mentioned terminal device and network device.

[0261] The above embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center to another website, computer, server or data center by wired (e.g., infrared, wireless, microwave, etc.) means.

[0262] The present application also provides a computer-readable medium for storing computer program code, wherein the computer program includes instructions for executing any of the information transmission methods provided in the above embodiments of the present application. The computer-readable medium may be the memory described in the above examples, and the present application is not limited thereto.

[0263] The present application also provides a computer program product, which includes instructions. When the instructions are executed, the terminal device performs terminal device operations corresponding to the above method, or the network device performs network device operations corresponding to the above method.

[0264] The present application also provides a chip, comprising: a processing unit and a communication unit. The processing unit may be, for example, a processor, and the communication unit may be, for example, an input / output interface, a pin, or a circuit. The processing unit may execute computer instructions to cause the chip within the communication device to perform any of the information transmission methods provided in the embodiments of the present application.

[0265] Optionally, any one of the communication devices provided in the above embodiments of the present application may include this chip.

[0266] Optionally, the computer instructions are stored in a storage unit.

[0267] Optionally, the storage unit is a storage unit within the chip, such as a register, a cache, etc. The storage unit may also be a storage unit located outside the chip within the communication device, such as a ROM or other type of static storage device that can store static information and instructions, RAM, etc. The processor mentioned in any of the above may be a CPU, a microprocessor, an ASIC, or one or more integrated circuits for controlling the execution of the program of the above-mentioned information transmission method. The processing unit and the storage unit may be decoupled and respectively provided on different physical devices, and connected by wired or wireless means to implement the respective functions of the processing unit and the storage unit, so as to support the chip to implement the various functions in the above-mentioned embodiments. Alternatively, the processing unit and the memory may also be coupled on the same device.

[0268] The terms "system" and "network" are often used interchangeably in this document. The term "and / or" is simply a description of an association between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " generally indicates an "or" relationship between the related objects.

[0269] Various objects such as various messages / information / equipment / systems / devices / actions / operations / processes that may appear in this application are named. It is understandable that these specific names do not constitute a limitation on the relevant objects. The names assigned may change with factors such as the scene, context or usage habits. The understanding of the technical meaning of the technical terms in this application should be mainly determined from the functions and technical effects embodied / executed in the technical solution.

[0270] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0271] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the unit is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0272] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0273] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0274] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for information transmission, characterized in that: The method comprises: Sending a first DCI, where the first DCI is carried on a PDCCH channel, the first DCI includes a first parameter, where the first parameter is used to determine whether a second DCI exists on a PDSCH channel, or at least one of the resources occupied by the second DCI on the PDSCH, where the second DCI includes: information about an uplink precoding matrix corresponding to uplink resources of a subband granularity; Send downlink data, send downlink data and the second DCI, or send the second DCI on the PDSCH channel.

2. The method according to claim 1, characterized in that The resource mapping mode and / or MCS of the second DCI is predefined or preconfigured.

3. The method according to claim 2, characterized in that The resource mapping manner of the second DCI includes: starting mapping from the first RE that does not contain a reference signal symbol on the PDSCH.

4. The method according to claim 2 or 3, characterized in that: The MCS of the second DCI is the same as the MCS of the downlink data transmitted on the PDSCH.

5. The method according to any one of claims 1 to 4, characterized in that When the following conditions are met, the second DCI exists on the PDSCH channel: PDSCH ≥O DCI ×ɑ; or, Among them, α represents the first parameter, K PDSCH represents the number of source bits of downlink data on the PDSCH, DCI Indicates the number of source bits of the second DCI.

6. The method according to any one of claims 1 to 5, characterized in that The resources occupied by the second DCI on the PDSCH include: the number of REs occupied by the second DCI on the PDSCH, and the number of REs occupied by the second DCI on the PDSCH satisfies the following condition: S represents the number of REs occupied by the second DCI on the PDSCH, M represents the number of available REs on the PDSCH, α represents the first parameter, and K PDSCH represents the number of source bits of the downlink data on the PDSCH, DCI Indicates the number of source bits of the second DCI.

7. The method according to any one of claims 1 to 3, characterized in that When the value of the first parameter is a first value, the first value of the first parameter is used to indicate that: the second DCI on the PDSCH channel exists, and there is no downlink data transmission on the PDSCH channel.

8. A method for information transmission, characterized in that: The method comprises: Receive a first DCI, where the first DCI is carried on a PDCCH channel, where the first DCI includes a first parameter, where the first parameter is used to determine whether a second DCI exists on a PDSCH channel, or at least one of the resources occupied by the second DCI on the PDSCH, where the second DCI includes: information about an uplink precoding matrix corresponding to uplink resources of a subband granularity; Determine, according to the first parameter, whether a second DCI exists on the PDSCH channel, or at least one of the resources occupied by the second DCI on the PDSCH; The downlink data, the downlink data and the second DCI, or the second DCI is received on the PDSCH channel.

9. The method according to claim 8, characterized in that The resource mapping mode and / or MCS of the second DCI is predefined or preconfigured.

10. The method according to claim 9, characterized in that The resource mapping manner of the second DCI includes: starting mapping from the first RE that does not contain a reference signal symbol on the PDSCH.

11. The method according to claim 9 or 10, characterized in that: The MCS of the second DCI is the same as the MCS of the downlink data transmitted on the PDSCH.

12. The method according to any one of claims 8 to 11, characterized in that When the following conditions are met, the second DCI exists on the PDSCH channel: PDSCH ≥O DCI ×α; or Among them, α represents the first parameter, K PDSCH represents the number of source bits of downlink data on the PDSCH, DCI Indicates the number of source bits of the second DCI.

13. The method according to any one of claims 8 to 12, characterized in that The resources occupied by the second DCI on the PDSCH include: the number of REs occupied by the second DCI on the PDSCH, and the number of REs occupied by the second DCI on the PDSCH satisfies the following condition: S represents the number of REs occupied by the second DCI on the PDSCH, M represents the number of available REs on the PDSCH, α represents the first parameter, and K PDSCH represents the number of source bits of the downlink data on the PDSCH, DCI Indicates the number of source bits of the second DCI.

14. The method according to any one of claims 8 to 10, characterized in that The determining, according to the first parameter, whether the second DCI exists on the PDSCH channel includes: When the value of the first parameter is the first value, it is determined that the second DCI of the PDSCH channel exists, and there is no downlink data transmission on the PDSCH channel.

15. The method according to any one of claims 8 to 14, characterized in that The receiving the second DCI on the PDSCH channel includes: The second DCI is demodulated on the PDSCH channel according to the resource mapping mode of the second DCI, the MCS of the second DCI, and the resources occupied by the second DCI on the PDSCH.

16. A communication device, characterized in that: include: A unit for executing the steps of the method according to any one of claims 1 to 7, or a unit for executing the steps of the method according to any one of claims 8 to 15.

17. A communication device, characterized in that: The method comprises at least one processor and an interface circuit, wherein the at least one processor is used to execute: the method according to any one of claims 1 to 7, or the method according to any one of claims 8 to 15.

18. A communication device, characterized in that: include: A processor, the processor is coupled to a memory, the memory is used to store programs or instructions, when the program or instructions are executed by the processor, the device executes: the method according to any one of claims 1 to 7, or the method according to any one of claims 8 to 15.

19. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein the computer program includes program instructions, and when the program instructions are executed by a processor, the processor executes: the method as claimed in any one of claims 1 to 7, or the method as claimed in any one of claims 8 to 15.

20. A chip, characterized in that: It comprises: a processor, used to call and run a computer program from a memory, so that a communication device equipped with the chip executes: a method as claimed in any one of claims 1 to 7, or a method as claimed in any one of claims 8 to 15.

Images