Method for transmitting control information and communication device

Abstract

The embodiment of the invention discloses a method for transmitting control information and a communication device. In order to reduce the number of blind detections of the DCI by the terminal device, the DCI can be carried on the PDSCH. In order to improve the transmission performance of the DCI carried on the PDSCH, the position of the time domain symbol used for carrying the DCI in the PDSCH can be determined according to the position of the time domain symbol of the DMRS in the PDSCH.

Description

Technical Field

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

[0002] The network equipment can carry downlink control information (DCI) on the physical downlink control channel (PDCCH), which can be used to schedule the physical downlink shared channel (PDSCH) or the physical uplink shared channel (PUSCH), etc.

[0003] Currently, when DCI is carried on PDCCH, the number of blind detections of PDCCH candidates by terminal equipment is large, and the power consumption of the terminal equipment is high. Summary of the invention

[0004] The embodiments of the present application provide a method and a communication device for transmitting control information, which can reduce the power consumption of a terminal device receiving DCI and improve the transmission performance of DCI.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the present application adopts the following technical solution.

[0006] In a first aspect, a method for transmitting control information is provided, the method comprising: receiving indication information, the indication information indicating a first time-frequency resource for carrying a first downlink data channel, the first time-frequency resource including a third time-frequency resource, the third time-frequency resource being used to carry a demodulation reference signal of the first downlink data channel; receiving first downlink control information on a second time-frequency resource, the second time-frequency resource being part of the first time-frequency resource, the first downlink control information indicating a time-frequency resource for carrying a second data channel; wherein the second time-frequency resource is determined based on the first symbol of the first time-frequency resource, or the second time-frequency resource is determined based on the third time-frequency resource.

[0007] The first downlink data channel may be, for example, a PDSCH. The first downlink control information may be a traditional DCI or a second-level DCI in a two-level DCI. The first downlink control information is used to schedule an uplink channel or a downlink channel, or to schedule an uplink signal or a downlink signal.

[0008] When the first downlink control information indicates the time-frequency resources used to carry the second data channel, the second data channel may be a PUSCH or a PDSCH.

[0009] Receiving the indication information and receiving the first downlink control information may be executed by the terminal device, or may be executed by a module (such as a chip) in the terminal device.

[0010] That is, in the present application, on the first time-frequency resource carrying the first downlink data channel, not only a demodulation reference signal (DMRS) is carried, but also a first DCI can be carried. The second time-frequency resource carrying the first DCI is determined according to the first time-frequency resource carrying the first PDSCH, or is determined according to the third time-frequency resource carrying the DMRS on the first time-frequency resource. Considering that the downlink data channel is sent to the terminal device itself, compared with the prior art that carries DCI on PDCCH, the terminal device needs to blindly detect DCI on multiple PDCCH candidates, which causes the terminal device to have high power consumption. In the present application, the terminal device can also receive the first DCI for scheduling the second data channel while receiving the time-frequency resource of the first downlink data channel, which can avoid the problem of high power consumption caused by the terminal device blindly detecting DCI on multiple PDCCH candidates. Moreover, if the second time-frequency resource carrying the first DCI is determined according to the first time-frequency resource, or according to the third time-frequency resource in the first time-frequency resource, the second time-frequency resource carrying the first DCI can be determined by comprehensively considering aspects such as delay, channel estimation performance and implementation complexity of the terminal device, so as to improve the transmission performance of DCI.

[0011] In a second aspect, a method for transmitting control information is provided, the method comprising: sending indication information, the indication information indicating a first time-frequency resource for carrying a first downlink data channel, the first time-frequency resource including a third time-frequency resource, the third time-frequency resource being used to carry a demodulation reference signal of the first downlink data channel; sending first downlink control information on a second time-frequency resource, the second time-frequency resource being part of the first time-frequency resource, the first downlink control information indicating a time-frequency resource for carrying a second data channel; wherein the second time-frequency resource is determined based on the first symbol of the first time-frequency resource, or the second time-frequency resource is determined based on the third time-frequency resource.

[0012] The sending of the indication information and the sending of the first downlink control information may be executed by the network device or by a module in the network device.

[0013] The beneficial effects of the second aspect can be found in the description of the first aspect.

[0014] In the above first aspect and / or second aspect, there are the following multiple possible designs.

[0015] In a possible design, the demodulation reference signal of the first downlink data channel is N groups of demodulation reference signals, where N is a positive integer; the time domain resources of the third time-frequency resources are N groups of symbols, and the nth group of symbols in the N groups of symbols carries the nth group of demodulation reference signals of the N groups of demodulation reference signals; wherein, any group of the N groups of symbols is one symbol or two consecutive symbols; when N is greater than or equal to 2, any two groups of the N groups of symbols are discontinuous in time domain, and n is a positive integer greater than or equal to 1 and less than or equal to N.

[0016] The reason why DMRS is said to be N groups of DMRS here is that there may be multiple groups of DMRS on the first PDSCH. Each group of DMRS may occupy one or more consecutive symbols. If each group of DMRS occupies one symbol, it can be understood that DMRS is in single-symbol mode; if each group of DMRS occupies two consecutive symbols, it can be understood that DMRS is in dual-symbol mode. If the first DCI is carried on the first PDSCH, the DMRS carried on the first PDSCH is considered. When the symbol carrying the first DCI is located between the symbol of the DMRS and the symbol of the DMRS, the channel estimate of the first DCI can be obtained by interpolating the channel estimate of the DMRS on both sides of the symbol carrying the first DCI; when the DMRS exists on only one side of the symbol carrying the first DCI, the channel estimate of the first DCI can be obtained by interpolating the channel estimate of the DMRS on one side of the symbol carrying the first DCI. In this way, the channel estimation quality under different symbol positions can be comprehensively considered, the symbol position of the symbol carrying the first DCI relative to the DMRS can be determined, and the channel estimation quality of the first DCI can be improved.

[0017] In one possible design, the second time-frequency resource is part or all of the time-frequency resource on each symbol of M symbols starting from the first symbol in the first time-frequency resource, where M is an integer greater than or equal to 1.

[0018] In this way, if the second time-frequency resource carrying the first DCI is part or all of the time-frequency resources on each symbol of M symbols starting from the first symbol carrying the first PDSCH, the time domain of sending the first DCI on the first PDSCH is earlier and the transmission delay of the first DCI is smaller.

[0019] In one possible design, the second time-frequency resource is part or all of the time-frequency resource on each symbol of M symbols starting from the first symbol of N groups of symbols in the first time domain resource, where M is an integer greater than or equal to 1.

[0020] In this way, if the first DCI is sent starting from the first symbol of the N groups of symbols carrying DMRS, not only can the time domain of sending the first DCI be earlier and the transmission delay of the first DCI be smaller, but also the channel estimation performance of the first DCI can be improved while considering the guaranteed channel estimation quality of DMRS.

[0021] In one possible design, the second time-frequency resource is part or all of the time-frequency resources on each of the M symbols starting from the first symbol after the first group of N groups of symbols in the first time-frequency resource, where M is an integer greater than or equal to 1.

[0022] In this way, if the first DCI is transmitted after the first group of symbols carrying DMRS, the problem of rate matching between DMRS and the first DCI can be avoided, and a compromise can be made among the delay, channel estimation performance and implementation complexity of the first DCI.

[0023] In one possible design, when N is greater than or equal to 2, the second time-frequency resources are part or all of the time-frequency resources on the M symbols closest to the second symbol in the time domain in the first time-frequency resources, where M is an integer greater than or equal to 1; wherein the second symbol is a symbol between the first group of symbols of N groups of symbols and the first symbol, the first symbol is the first symbol of a group of symbols in the N groups of symbols other than the first group of symbols, and the second symbol and the first group of symbols are not continuous in time domain.

[0024] In this way, when the first DCI is transmitted on the first PDSCH, when the symbol carrying the first DCI is located on the time-frequency resource between the first group of symbols and the first symbol and closest to the second symbol in the time domain, the channel estimate of the first DCI can be obtained by interpolating the channel estimates of the DMRS on both sides of the symbol carrying the first DCI, thereby improving the channel estimation performance of the first DCI.

[0025] In a possible design, the first symbol is the first symbol of the last group of symbols of the N groups of symbols. Thus, all DMRSs carried on the first PDSCH can be used to perform channel estimation of the first DCI, and the channel estimation quality of the first DCI is good.

[0026] In one possible design, the first symbol is the earliest symbol in the time domain that can meet the following conditions: the time-frequency resources between the first group of symbols and the first symbol that can be used to carry the first downlink control information are greater than or equal to the time-frequency resources required by the first downlink control information.

[0027] In this way, the channel estimation of part of the DMRS on the first PDSCH can be used to perform the channel estimation of the first DCI, which not only ensures that the channel estimation of the first DCI is obtained by interpolating the channel estimation of the RM-RS, thereby improving the channel estimation quality of the first DCI, but also only uses part of the DMRS on the first PDSCH, thereby reducing the delay from the first DCI to the second data channel.

[0028] In one possible design, the first symbol is one of the N groups of symbols indicated by signaling or specified by the protocol. In this way, the symbol carrying the first DCI is between the first group of symbols and the first symbol, and the network device can determine the encoding or rate matching method of the first DCI according to the time-frequency resources between the first group of symbols and the first symbol to ensure that the first DCI is carried between the first group of symbols and the first symbol.

[0029] In one possible design, when N is 1, the second time-frequency resource is part or all of the time-frequency resources on the M symbols closest to the N groups of symbols in the time domain in the first time-frequency resource.

[0030] For example, a network device or a terminal device may select symbols that are close to the first group of symbols, symbols before the first group of symbols in the time domain, symbols after the first group of symbols in the time domain, etc. Considering that there is only one group of DMRS symbols on the first time-frequency resource of the first PDSCH, the closer the distance to this group of DMRS symbols, the better the channel estimation quality, which can ensure that the channel estimation quality of the first DCI is better.

[0031] In one possible design, the M symbols are: continuous symbols in the time domain; or, symbols in the time domain continuous symbols except the first category of symbols; wherein the first category of symbols includes at least one of the following: symbols indicating the location of information; symbols in N groups of symbols; symbols containing rate matching resources.

[0032] In this way, if the M symbols carrying the first DCI are continuous symbols in the time domain, the implementation complexity of the network device sending the first DCI and the terminal device receiving the first DCI is relatively small. If the M symbols carrying the first DCI do not include the first type of symbols, the implementation complexity of the network device sending the first DCI and the terminal device receiving the first DCI can also be relatively small.

[0033] In a possible design, when the terminal device reports that it does not support receiving the first downlink control information on N groups of symbols, the first type of symbols includes symbols in the N groups of symbols. That is, whether to carry the first DCI on the N groups of symbols may be determined by the capabilities of the terminal device. If the terminal device does not support carrying the first DCI on the N groups of symbols, considering that the resources of the N groups of symbols carried on the first PDSCH are irregular, the network device does not send the first DCI on the N groups of symbols, which can improve the implementation complexity of the network device sending the first DCI and the terminal device receiving the first DCI.

[0034] In a possible design, when the terminal device reports that it does not support receiving the first downlink control information on the CORESET carrying the indication information, the first type of symbol includes the symbol where the indication information is located. That is, if the first time-frequency resource of the first PDSCH carries the indication information, and the capability of the terminal device does not support carrying the first DCI on the symbol carrying the indication information, the network device does not send the first DCI on the symbol carrying the indication information, which can improve the implementation complexity of the network device sending the first DCI and the terminal device receiving the first DCI.

[0035] In a possible design, the minimum time interval between the end symbol of the third time-frequency resource and the start symbol of the second data channel is the first time interval. The first time interval is the minimum time interval between the end symbol of the second downlink control information and the start symbol of the data channel scheduled by the second downlink control information, and the second downlink control information is any downlink control information carried on the physical downlink control channel.

[0036] For example, the second downlink control information is the second DCI, and the second DCI is any DCI carried on the PDCCH. That is, the first time interval is the minimum time interval from the end symbol carrying the second DCI to the start symbol time of the data channel scheduled by the second DCI. The data channel scheduled by the second DCI is, for example, PDSCH / PUSCH, etc.

[0037] If the minimum time interval between the end symbol of the third time-frequency resource carrying DMRS on the first PDSCH and the start symbol of the second data channel scheduled by the first DCI is the first time interval, the design of channel estimation using all DMRS on the first PDSCH can be combined to improve the channel estimation quality of the first DCI. It can also ensure that the terminal device determines whether to send or receive the data channel according to the first time interval, thereby improving the data transmission efficiency of the terminal device and reducing the power consumption of the terminal device when not sending or receiving the data channel.

[0038] Among them, within the first time interval, the terminal device can perform channel estimation, demodulation and decoding of the first DCI, and data preparation of the data channel, etc.

[0039] In one possible design, if the end symbol of the second time-frequency resource is after the end symbol of N groups of symbols, the minimum time interval between the end symbol of the second time-frequency resource and the start symbol of the second data channel is the first time interval. Assuming that N groups of symbols are 1 group of symbols, the end time of the second time-frequency resource occupied by the first DCI is after the end time of this 1 group of symbols, the minimum time interval between the end time of the end symbol of the second time-frequency resource occupied by the first DCI and the start time of the start symbol of the second data channel scheduled by the first DCI is the first time interval. That is, the first time interval is determined according to the end time of the first DCI to ensure the reception performance of the terminal device receiving the first DCI.

[0040] If the end symbol of the second time-frequency resource is before the end symbol of N groups of symbols, in the N groups of symbols, the minimum time interval between the end symbol of the earliest symbol group after the end symbol of the second time-frequency resource and the start symbol of the second data channel is the first time interval. Therefore, if N is 1, it is equivalent to that the end symbol of the first DCI is before this group of symbols, and the minimum time interval between the end symbol of this group of symbols and the start symbol of the second data channel is the first time interval. If N is greater than or equal to 2, the first DCI can be carried between the first group of symbols and the earliest symbol group after the end symbol of the first DCI. At this time, the minimum time interval between the end symbol of the earliest symbol group and the start symbol of the second data channel is the first time interval. The channel estimate carrying the first DCI can be obtained by interpolation, so that the quality of the channel estimate obtained is better.

[0041] If the end symbol of the second time-frequency resource is a symbol in N groups of symbols, the minimum time interval between the end symbol of the symbol group in the N groups of symbols overlapping with the end symbol of the second time-frequency resource and the start symbol of the second data channel is the first time interval. Assuming that N is 3, and the end symbol of the second time-frequency resource carrying the first DCI is on the second group of symbols, the minimum time interval between the end symbol of the second group of symbols and the start symbol of the second data channel is the first time interval.

[0042] In one possible design, when N is greater than or equal to 2, the minimum time interval between the end symbol of the second time-frequency resource and the start symbol of the second data channel is the first time interval plus a preset duration. In this way, when the DMRS and the first DCI are carried on the first PDSCH, the minimum time interval between the end symbol of the first DCI and the start symbol of the second data channel is the existing first time interval plus a preset duration, so that the terminal device can complete channel estimation, demodulation and decoding of the first DCI, and preparation of the data channel within the minimum time interval.

[0043] In one possible design, the demodulation reference signal of the first downlink data channel carried on all symbol groups in the N groups of symbols is used to estimate the channels of all symbols of the second time-frequency resource. In this way, when the first DCI is carried between the first group of symbols and the last group of symbols, and the DMRS carried on all symbol groups is used to perform channel estimation of the first DCI, the channel estimation of the first DCI can be obtained by interpolating the channel estimation of the DMRS, which can improve the channel estimation performance of the first DCI.

[0044] In one possible design, when N is greater than or equal to 2: among the N groups of symbols, the demodulation reference signal of the first downlink data channel carried on the earliest symbol group after the end symbol of the second time-frequency resource and all symbol groups before the earliest symbol group is used to estimate the channels of all symbols of the second time-frequency resource.

[0045] In combination with the above design, if N is greater than or equal to 2, the symbol carrying the first DCI may be between the first group of symbols and the last group of symbols. If the DMRS on the earliest symbol group after the end symbol carrying the first DCI and all the symbol groups before the earliest symbol group are used to perform channel estimation of the first DCI, the channel estimation of the first DCI can be obtained by interpolation of the DMRS. Moreover, if N is greater than or equal to 3, if the first DCI is carried before a group of symbols between the earliest symbol group and the last group of symbols, part of the DMRS may be used to perform channel estimation of the first DCI, thereby reducing the transmission delay from the first DCI to the first DCI scheduling.

[0046] Or, in N groups of symbols, the demodulation reference signal of the first downlink data channel carried on the symbol group where the end symbol of the second time-frequency resource is located, and all symbol groups before the symbol group where the end symbol of the second time-frequency resource is located is used to estimate the channel of all symbols of the second time-frequency resource. That is, if N is greater than or equal to 2, and the end symbol of the second time-frequency resource carrying the first DCI is on a certain group of DMRS symbols, the DMRS carried on the DMRS symbol group where the end symbol of the second time-frequency resource is located can be used to estimate the channel of all symbols carrying the first DCI. In combination with the above design, when the end symbol carrying the first DCI is on a certain group of symbols in the middle, part of the DMRS can be used to perform channel estimation of the first DCI, which not only ensures that the channel estimation of the first DCI is obtained by interpolation of the DMRS, but also reduces the transmission delay from the first DCI to the first DCI scheduling.

[0047] In one possible design, among N groups of symbols, the demodulation reference signal of the first downlink data channel carried on all symbol groups before the end time of the end symbol of the second time-frequency resource is used to estimate the channels of all symbols of the second time-frequency resource.

[0048] For example, when N is 1, on the first time-frequency resource of the first PDSCH, the second time-frequency resource carrying the first DCI may be after the symbol group carrying the DMRS, and the DMRS carried on the symbol group is used to estimate the channel of all symbols carrying the first DCI. Alternatively, when N is greater than or equal to 2, on the first time-frequency resource of the first PDSCH, the second time-frequency resource carrying the first DCI may be between two symbol groups, and the DMRS carried on all symbol groups before the end time of the second time-frequency resource is used to estimate the channel of all symbols of the first DCI, so that the channel of the first DCI can be obtained by interpolating the DMRS, thereby improving the channel estimation quality of the first DCI.

[0049] According to a third aspect, a communication device is provided, comprising: a receiving unit, configured to receive indication information, the indication information indicating a first time-frequency resource for carrying a first downlink data channel, the first time-frequency resource including a third time-frequency resource, the third time-frequency resource being used to carry a demodulation reference signal of the first downlink data channel; the receiving unit, further configured to receive first downlink control information on a second time-frequency resource, the second time-frequency resource being part of the first time-frequency resource, the first downlink control information indicating a time-frequency resource for carrying a second data channel; wherein the second time-frequency resource is determined based on the first symbol of the first time-frequency resource, or the second time-frequency resource is determined based on the third time-frequency resource.

[0050] In a fourth aspect, a communication device is provided, comprising: a sending unit, configured to send indication information, the indication information indicating a first time-frequency resource for carrying a first downlink data channel, the first time-frequency resource including a third time-frequency resource, the third time-frequency resource being used to carry a demodulation reference signal of the first downlink data channel; the sending unit, further configured to send first downlink control information on a second time-frequency resource, the second time-frequency resource being part of the first time-frequency resource, the first downlink control information indicating a time-frequency resource for carrying a second data channel; wherein the second time-frequency resource is determined based on the first symbol of the first time-frequency resource, or the second time-frequency resource is determined based on the third time-frequency resource.

[0051] The beneficial effects of the third and fourth aspects can be found in the description of the first aspect.

[0052] In a fifth aspect, a communication system is provided, which may include a network device and at least one terminal device in any possible implementation of any of the above aspects.

[0053] In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer instructions are stored. When the computer instructions are executed on a communication device, the communication device executes the method for transmitting control information in any of the above aspects and any possible implementation methods.

[0054] In a seventh aspect, an embodiment of the present application provides a computer program product, which, when the computer program instructions are executed on a communication device, enables the communication device to execute the method for transmitting control information in any of the above aspects and any possible implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 A schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

[0056] Figure 2 A schematic diagram of PDSCH mapping type A and mapping type B provided in an embodiment of the present application;

[0057] Figure 3 A schematic diagram of sorting the channel estimation quality of each symbol at pos0, pos1, pos2 and pos3 in a single symbol mode DMRS scenario provided in an embodiment of the present application;

[0058] Figure 4 A schematic diagram of PDCCH scheduling PDSCH provided in an embodiment of the present application;

[0059] Figure 5 A schematic diagram of the time from the end of the last symbol of the PDCCH scheduling PUSCH to the start time of the first uplink symbol of the corresponding PUSCH provided in an embodiment of the present application;

[0060] Figure 6 A schematic diagram of a method for transmitting control information provided in an embodiment of the present application;

[0061] Figure 7 A schematic diagram of a second time-frequency resource on a first time-frequency resource of a first PDSCH provided in an embodiment of the present application;

[0062] Figure 8 A schematic diagram of a second time-frequency resource on a first time-frequency resource of a first PDSCH provided in an embodiment of the present application;

[0063] Fig. 9 A schematic diagram of the minimum time interval between the first DCI and the PUSCH when the first PDSCH carries the DMRS and the first DCI provided in an embodiment of the present application;

[0064] Fig.10 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0065] Fig.11 A schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0066] Figure 1 FIG. 1 is a schematic diagram of the architecture of a communication system 10 used in an embodiment of the present application. Figure 1 As shown, the communication system includes a radio access network (RAN) 100, wherein the RAN 100 includes at least one RAN node (such as Figure 1 110a and 110b in the figure, collectively referred to as 110), and may also include at least one terminal (such as Figure 1 RAN 100 may also include other RAN nodes, such as wireless relay equipment and / or wireless backhaul equipment ( Figure 1 The terminal 120 is connected to the RAN node 110 in a wireless manner. Terminals and terminals and RAN nodes and RAN nodes can be connected to each other by wire or wireless means. The communication system 10 may also include a core network 200. The RAN node 110 is connected to the core network 200 in a wireless or wired manner. The core network device in the core network 200 and the RAN node 110 in the RAN 100 may be independent and different physical devices, or may be the same physical device that integrates the logical functions of the core network device and the logical functions of the RAN node. The communication system 10 may also include the Internet 300.

[0067] RAN100 may be an evolved universal terrestrial radio access (E-UTRA) system, a new radio (NR) system, and a future radio access system defined in the 3rd generation partnership project (3GPP). RAN100 may also include two or more of the above-mentioned different radio access systems. RAN100 may also be an open RAN (O-RAN).

[0068] RAN nodes, also known as radio access network equipment, RAN entities or access nodes, are used to help terminals access the communication system wirelessly. In one application scenario, a RAN node can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in a fifth generation (5G) mobile communication system, a next generation NodeB in a sixth generation (6G) mobile communication system, or a base station in a future mobile communication system. A RAN node can be a macro base station (such as a Figure 1 110a), or a micro base station or an indoor station (such as Figure 1 110b) in the figure, it can also be a relay node or a donor node.

[0069] In another application scenario, the cooperation of multiple RAN nodes can be used to help the terminal achieve wireless access, and different RAN nodes respectively implement part of the functions of the base station. For example, the RAN node can be a centralized unit (CU), a distributed unit (DU) or a radio unit (RU). The CU here completes the functions of the radio resource control protocol and the packet data convergence protocol (PDCP) of the base station, and can also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the radio link control layer and the medium access control (MAC) layer of the base station, and can also complete the functions of part of the physical layer or all of the physical layer. For the specific description of the above-mentioned various protocol layers, please refer to the relevant technical specifications of 3GPP. RU can be used to implement the transceiver function of radio frequency signals. CU and DU can be two independent RAN nodes, or they can be integrated in the same RAN node, such as integrated in a baseband unit (BBU). RU can be included in a radio frequency device, such as a remote radio unit (RRU) or an active antenna unit (AAU). The CU can be further divided into two types of RAN nodes: CU-control plane and CU-user plane.

[0070] In different systems, RAN nodes may have different names. For example, in an O-RAN system, CU may be called an open CU (open CU, O-CU), DU may be called an open DU (open DU, O-DU), and RU may be called an open RU (open RU, O-RU). The RAN node in the embodiment of the present application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. For example, the RAN node may be a server loaded with a corresponding software module. The embodiments of the present application do not limit the specific technology and specific device form adopted by the RAN node. For the convenience of description, the following description takes a base station as an example of a RAN node.

[0071] A terminal is a device with wireless transceiver function, which can send signals to a base station or receive signals from a base station. A terminal can also be called a terminal device, user equipment (UE), a mobile station, a mobile terminal, etc. The terminal can be widely used in various scenarios, for example, device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, automatic driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a wearable device, a vehicle, an airplane, a ship, a robot, a mechanical arm, a smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal.

[0072] Base stations and terminals can be fixed or movable. Base stations and terminals can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on airplanes, balloons, and artificial satellites. The embodiments of this application do not limit the application scenarios of base stations and terminals.

[0073] The roles of the base station and the terminal can be relative, for example, Figure 1The helicopter or drone 120i in the figure can be configured as a mobile base station. For the terminal 120j that accesses the wireless access network 100 through 120i, the terminal 120i is a base station; but for the base station 110a, 120i is a terminal, that is, 110a and 120i communicate through the wireless air interface protocol. Of course, 110a and 120i can also communicate through the interface protocol between base stations. In this case, relative to 110a, 120i is also a base station. Therefore, base stations and terminals can be collectively referred to as communication devices. Figure 1 110a and 110b in the figure may be referred to as communication devices having base station functions. Figure 1 120a-120j in the figure can be called communication devices with terminal functions.

[0074] Base stations and terminals, base stations and base stations, and terminals and terminals can communicate through authorized spectrum, unauthorized spectrum, or both; they can communicate through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0075] In the embodiments of the present application, the functions of the base station may also be performed by a module (such as a chip) in the base station, or by a control subsystem including the base station function. The control subsystem including the base station function here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal may also be performed by a module (such as a chip or a modem) in the terminal, or by a device including the terminal function.

[0076] In this application, the base station sends a downlink signal or downlink information to the terminal, and the downlink information is carried on the downlink channel; the terminal sends an uplink signal or uplink information to the base station, and the uplink information is carried on the uplink channel. In order to communicate with the base station, the terminal needs to establish a wireless connection on the cell controlled by the base station. The cell with which the terminal has established a wireless connection is called the service cell of the terminal. When the terminal communicates with the service cell, it will also be interfered by signals from neighboring cells.

[0077] In the embodiments of the present application, the time domain symbol may be an orthogonal frequency division multiplexing (OFDM) symbol or a discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol. Unless otherwise specified, the symbols in the embodiments of the present application refer to time domain symbols.

[0078] It can be understood that in the embodiments of the present application, PDSCH, PDCCH and PUSCH are merely examples of downlink data channels, downlink control channels and uplink data channels, respectively. In different systems and different scenarios, data channels and control channels may have different names, and the embodiments of the present application do not limit this.

[0079] To facilitate understanding, the following examples provide some descriptions of concepts related to the embodiments of the present application for reference.

[0080] 1. Subcarrier spacing (SCS)

[0081] In NR, multiple SCSs are defined. The SCS number μ corresponds to 2 μ ·15kHz. For example, the SCS with serial number μ of 0 to 4 corresponds to 15kHz, 30kHz, 60kHz, 120kHz and 240kHz respectively. In NR, a resource block (RB) is defined as 12 consecutive subcarriers in the frequency domain.

[0082] 2. Carrier and Cell

[0083] A carrier is a radio signal with a specific frequency, bandwidth, and format, that is, an electromagnetic wave, emitted by the radio frequency equipment of a base station or terminal. It is a carrier used to carry information in wireless mobile communications. The carrier used by the base station for transmission is called a downlink carrier, and the carrier used by the terminal for transmission is called an uplink carrier.

[0084] A cell is described by a high layer (such as a radio resource control layer, a media access control layer, or a protocol layer above the physical layer) from the perspective of resource management or mobility management. The coverage area of ​​each network device can be divided into one or more cells.

[0085] In the current NR standard, a cell can be configured with one downlink carrier. Optionally, a cell can also be configured with one uplink carrier or two uplink carriers. For a terminal device, the cell that provides service for it is called a serving cell. The cell involved in this application may also be a serving cell.

[0086] 3. Carrier aggregation and cross-carrier scheduling

[0087] In order to achieve high-speed transmission, NR has a carrier aggregation (CA) mechanism. Terminals that support CA can transmit data on multiple carriers at the same time, thereby increasing the data transmission rate.

[0088] Each carrier in CA is also called a component carrier or component carrier (CC).

[0089] The cell that can send the PDCCH corresponding to the data channel is called the scheduling cell, also called the master cell; the cell that performs data channel transmission is called the scheduled cell. The UE receives the PDCCH on the master cell and sends or receives data on the scheduled cell according to the control information carried in the PDCCH.

[0090] The downlink carrier of a cell carries the control channel and performs scheduling of the uplink and downlink data channels of the cell. This cell is a self-scheduling cell. This cell is both a scheduling cell and a scheduled cell.

[0091] Among multiple cells of CA, the downlink carrier of one cell carries a control channel, which can schedule the uplink and downlink data channels of another cell. Here, the cell carrying the control channel is called the scheduling cell, and the cell carrying the uplink and downlink data channels is called the scheduled cell. This form of scheduling is called cross carrier scheduling (CCS). One scheduling cell can correspond to multiple scheduled cells, that is, one scheduling cell can send a control channel to schedule data for multiple scheduled cells.

[0092] 4. PDCCH

[0093] A PDCCH candidate in a NR can contain L = {1, 2, 4, 8, 16} control channel elements (CCEs). Here L is called the aggregation level (AL) of the PDCCH candidate. A CCE contains 6 resource-element groups (REGs), each REG corresponds to an RB on an OFDM symbol.

[0094] A PDCCH candidate may or may not contain a PDCCH for a UE. A UE can monitor a PDCCH candidate to determine whether there is a PDCCH for it.

[0095] A search space with an aggregation level AL of L is defined as a set of PDCCH candidates with a size of L CCEs. A search space set is a set of search spaces with different ALs. Sometimes, search space is a general concept that can be used to represent search space, search space set, multiple search space sets, or a class of search space sets.

[0096] A search space set is associated with a control resource set (CORESET). CORESET is a concept introduced in NR. A CORESET is defined in a cell and contains a set of continuous or non-continuous RBs in the frequency domain and 1 / 2 / 3 continuous OFDM symbols in the time domain.

[0097] 5. DCI

[0098] 1) Introduction to basic concepts of DCI

[0099] In NR, DCI is carried on PDCCH. For example, the DCI in the PDCCH that schedules PDSCH may contain control information such as the indicated cell being scheduled, and two resource indication fields of PDSCH: frequency domain resource assignment and time domain resource assignment. The DCI in the PDCCH that schedules PUSCH may contain control information such as the indicated cell being scheduled, and two resource indication fields of PUSCH: frequency domain resource assignment and time domain resource assignment.

[0100] 2) DCI size

[0101] There are two ways to understand the size of DCI. The first is the number of bits in the payload in the DCI, and the second is the sum of the number of bits in the payload and the number of bits in the cyclic redundancy check (CRC). If the information bits in the DCI are padded, the number of bits in the payload is the sum of the number of information bits and the number of information bits of the padding; if the information bits in the DCI are not padded, the number of bits in the payload is the number of information bits. In the NR system, for example, the bit width of the CRC is 24.

[0102] 3) Two-level DCI

[0103] The two-level DCI includes the first-level DCI and the second-level DCI. The two DCIs send different downlink scheduling information and are used together to complete the scheduling of PDSCH / PUSCH or other functions. Among them, the number of information bits of the first-level DCI is generally fixed, and the number of information bits of the second-level DCI is generally variable. The two-level DCI can save control channel resources and reduce the complexity of UE's PDCCH monitoring.

[0104] The use of two-level DCI in the multi-cell scheduling DCI format is currently under discussion. The multi-cell scheduling DCI format will be introduced below.

[0105] 6. Multi-cell scheduling DCI format

[0106] 1) The adjusted cell set

[0107] Currently, two new DCI formats are being discussed in the standard. These two DCI formats can be used to schedule data transmission of two or more cells at the same time, which are called multi-cell scheduling DCI formats. Table 1 shows the two DCI formats.

[0108] Table 1

[0109] DCI format use DCI format 0_3 Schedule PUSCH on the uplink carrier of one or more cells DCI format 1_3 Schedule PDSCH on the downlink carrier of one or more cells

[0110] One UE may be configured with one or more scheduled cell sets, and cells in each scheduled cell set may use the DCI format 0_3 / 1_3 shown in Table 1 for multi-cell scheduling.

[0111] Exemplarily, a UE is configured with two scheduled cell sets, the first scheduled cell set includes cell 0, cell 1, cell 2 and cell 3, and the second scheduled cell set includes cell 4, cell 5 and cell 6. DCI format 0_3 can schedule one or more cells of cell 0, cell 1, cell 2 and cell 3 at the same time; DCI format 1_3 can schedule one or more cells of cell 4, cell 5 and cell 6 at the same time.

[0112] A DCI format with a multi-cell scheduling DCI format can schedule data transmission on multiple cells, but not every DCI format with a multi-cell scheduling DCI format schedules data transmission on multiple cells at the same time. There is an indication field in a multi-cell scheduling DCI format, indicating one or more scheduled cells currently scheduled by this DCI, and these one or more scheduled cells are all cells in the scheduled cell set corresponding to this multi-cell scheduling DCI format.

[0113] Since multi-cell scheduling is scheduling multiple carriers in multiple cells, the multi-cell scheduling DCI format is sometimes also called a multi-carrier scheduling DCI format.

[0114] 7. DMRS transmission of PDSCH

[0115] 1) PDSCH mapping type

[0116] In NR, PDSCH has two mapping types: mapping type A and mapping type B. The starting symbol S (the first symbol number of the time slot is 0, and so on) and the number of continuous symbols L (counting from symbol S) of the two types of PDSCH are different, and the position of DMRS is also different. The following table shows the difference between S and L of the two mapping types. As can be seen from Table 2, in the normal cyclic prefix (NCP) (extended cyclic prefix (ECP) is similar):

[0117] The starting symbol occupied by the PDSCH of mapping type A may be the first 4 symbols {0, 1, 2, 3}, and the starting symbol occupied by the PDSCH of mapping type B may be the first 13 symbols {0, ..., 12}; the number of continuous symbols occupied by the PDSCH of mapping type A may be {3, ..., 14}, and the number of continuous symbols occupied by the PDSCH of mapping type B may be {2, 4, 7}.

[0118] Table 2

[0119]

[0120] Among them, the dmrs-TypeA-Posiition in Table 2 is a high-level parameter, which can be configured as {pos0, pos1, pos3}. If not configured, the default is pos2. Pos indicates the number of symbol groups. The following is an introduction to symbol groups. Pos0 indicates that there are 1 group of DMRS symbols on the PDSCH, pos1 indicates that there are 2 groups of DMRS symbols, pos2 indicates that there are 3 groups of DMRS symbols, and pos3 indicates that there are 4 groups of DMRS symbols.

[0121] like Figure 2 (a) in FIG. 1 shows an example of a PDSCH mapping type A, where the starting symbol S of the PDSCH is 2 and the number of continuous symbols L is 11 (symbols 2 to 12). Figure 2 (b) in FIG. 1 shows an example of a PDSCH mapping type B, where the starting symbol S of the PDSCH is 4 and the number of continuous symbols L is 2 (symbols 4 to 5). Figure 2 (c) shows an example of a PDSCH mapping type B, where the starting symbol S of the PDSCH is 8 and the number of continuous symbols L is 4 (symbols 8 to 11).

[0122] 2) Transmission of DMRS for PDSCH

[0123] First, let's clarify the description in the protocol: In the protocol, the symbol count starts from 0, but when we talk about the symbol number, we start from 1. That is, the symbol with a count of 0 is the 1st symbol, the symbol with a count of 1 is the 2nd symbol, and so on.

[0124] The DMRS carried by PDSCH has single symbol mode and dual symbol mode. In single symbol mode, DMRS can be sent on one or more symbols, and these symbols for sending DMRS are not connected. In dual symbol mode, DMRS can be sent on one or more groups of symbols, and each group of DMRS is transmitted on 2 consecutive OFDM symbols, and the groups are not connected.

[0125] Among them, DMRS is placed The symbol of . Among them:

[0126] In single symbol mode, is one or more discontinuous symbols, l′ is 0;

[0127] In dual symbol mode, It is one or more discontinuous symbols, that is, the first symbol of each group of DMRS symbols. l' can be 0 or 1, corresponding to 2 consecutive symbols in dual symbol mode.

[0128] Among them, the reference point of l and the first DMRS symbol position l 0 Depends on the mapping type.

[0129] For mapping type A, l is defined based on the starting symbol of the timeslot. If the higher-layer parameter dmrs-TypeA-Position is 'pos3', the starting symbol l 0 =3, otherwise l 0 = 2. That is, the dmrs-AdditionalPosition mentioned above is a high-level parameter. If it is not configured, it defaults to pos2.

[0130] For mapping type B, l is defined according to the starting symbol of the scheduled PDSCH resource. The starting symbol l 0 =0.

[0131] The position of the DMRS symbol is determined by and l d OK, here is l d There are two situations:

[0132] For mapping type A, l d It is the time domain interval from the first OFDM symbol of the time slot to the last symbol of the scheduled PDSCH resource; for mapping type B, l d It is the time domain interval of the OFDM symbol of the scheduled PDSCH resource.

[0133] Tables 3 and 4 below show the PDSCH DMRS positions under single-symbol DMRS and dual-symbol DMRS, respectively.

[0134] Among them, for mapping type A, single symbol DMRS, l in Table 3 1 It may be 11 or 12. In addition, due to the influence of some rate matching resources, the DMRS position of PDSCH mapping type B may move backward.

[0135] Table 3 PDSCH DMRS position under single symbol DMRS

[0136]

[0137] Table 4 PDSCH DMRS position under dual-symbol DMRS

[0138]

[0139] 8. PDSCH channel estimation quality

[0140] Since the DMRS of the PDSCH is only placed on some symbols of the PDSCH, the channel estimation quality on different symbols of the PDSCH is different.

[0141] Figure 3 The figure shows the ranking of the channel estimation quality of each symbol when the DMRS-Additional Positions are pos0, pos1, pos2, and pos3 respectively for PDSCH mapping type A and single symbol mode DMRS scenario with a symbol length of 14. The numbers corresponding to the channel estimation quality of the symbol are from small to large, corresponding to the current symbol channel estimation quality from good to bad.

[0142] For example, for the pos0 scenario, the DMRS carried on the PDSCH occupies only 1 symbol 2; for the pos1 scenario, the DMRS carried on the PDSCH occupies 2 symbols: symbols 2 and 11; for the pos2 scenario, the DMRS carried on the PDSCH occupies 2 symbols: symbols 2, 7 and 11; for the pos3 scenario, the DMRS carried on the PDSCH occupies 4 symbols: symbols 2, 5, 8 and 11.

[0143] Among them, the channel estimation quality of each symbol has the following two rules: the channel estimation performance between DMRS symbols obtained by DMRS interpolation is better; when DMRS exists only on one side, the channel estimation performance obtained by DMRS extrapolation is lower than the channel estimation performance obtained by interpolation.

[0144] Among them, interpolation means that a PDSCH symbol is located between two DMRS symbols. The DMRS on the two DMRS symbols can be used to perform channel estimation on the two DMRS symbols, and then the channel estimation on this PDSCH symbol can be interpolated from the channel estimation of the two DMRS symbols. For example, for dmrs-AdditionalPosition=pos1, the symbol channel estimates corresponding to PDSCH symbols 3 to 10 can be interpolated from the channel estimates of DMRS symbols 2 and 11. Extrapolation means that there is a DMRS symbol on only one side of a PDSCH symbol, and interpolation channel estimation cannot be performed, only extrapolation channel estimation can be performed. For example, taking dmrs-AdditionalPosition=pos1 as an example, the channel estimates of PDSCH symbols 0 and 1, and PDSCH symbols 12 and 13 can be obtained by extrapolating the channel estimates of DMRS symbols 2 and 11.

[0145] 9. Processing time from DCI to data channel

[0146] 1) DCI to PDSCH processing time

[0147] When DCI is carried on PDCCH, the PDCCH carrying DCI is transmitted in a subcarrier interval of μ PDCCH The PDSCH scheduled by DCI is sent on another subcarrier with a spacing of μ PDSCHThe carrier is sent, and μ PDCCH Not equal to μ PDSCH When the unit time slot length of PDCCH is μ PDCCH The unit time slot length μ of the time slot and PDSCH PDSCH different.

[0148] In μ PDCCH <μ PDSCH In the case of PDSCH, the start symbol is not earlier than N after the end time of PDCCH. pdsch The first symbol of the first PDSCH slot after PDCCH symbols, such as Figure 4 (a) shows that in μ PDCCH <μ PDSCH Schematic diagram of PDCCH scheduling PDSCH in the case of subcarrier spacing of μ PDCCH When PDCCH is sent on a carrier, the end time of PDCCH is in time slot n, and the DCI carried by PDCCH is in subcarrier spacing of μ PDSCH When scheduling PDSCH on a carrier, the start time of PDSCH is N times later than the end time of PDCCH. pdsch The first PDSCH time slot 2n+2 after the PDCCH symbols, for example, the start time of the PDSCH is at the time slot 2n+3.

[0149] In μ PDCCH >μ PDSCH In this case, the time interval between the end symbol of PDCCH and the start symbol of PDSCH shall not be less than N pdsch PDCCH symbols, such as Figure 4 (b) shows that in μ PDCCH >μ PDSCH Schematic diagram of PDCCH scheduling PDSCH in the case of subcarrier spacing of μ PDCCH When PDCCH is sent on a carrier with a subcarrier spacing of μ, the end time of PDCCH is on time slot 2n, and the DCI carried by PDCCH is on a subcarrier spacing of μ. PDSCH When scheduling PDSCH on a carrier, the start time of PDSCH is N times later than the end time of PDCCH. pdsch The start time of a PDCCH symbol, for example, the PDSCH is in time slot n+1.

[0150] Among them, N pdsch The value of is changed with the subcarrier spacing μ of PDCCH. PDCCH The different values ​​can be seen in Table 5.

[0151] Table 5

[0152] <![CDATA[μ PDCCH ]]> <![CDATA[N pdsch [Symbol]]]> 0 4 1 5 2 10 3 14 5 56 6 112

[0153] 10. Processing time from DCI to PUSCH

[0154] NR defines two user capabilities (UE processing capability 1 and UE processing capability 2) for the PUSCH processing time (i.e., the time from the UE receiving the DCI scheduling PUSCH to the UE preparing to transmit the PUSCH).

[0155] like Figure 5 The figure shows the time from the end of the last symbol of the PDCCH scheduling PUSCH to the start time of the first uplink symbol (including DMRS) of the corresponding PUSCH. The time from the end of the last symbol of the PDCCH scheduling PUSCH to the start time of the first uplink symbol (including DMRS) of the corresponding PUSCH is not less than T proc,2 =max((N 2 +d 2,1 )(2048+144)·κ2 -μ ·T C ,d 2,2 ). That is to say, when designing the terminal equipment, it must be able to proc,2 Only when the PDCCH reception and information analysis can be completed and the corresponding PUSCH can be generated (including channel estimation for DCI, demodulation and decoding of DCI, and PUSCH data preparation) can the most stringent scheduling requirements be met. Among them:

[0156] 1)N 2 It is determined by UE based on μ and its own processing capability, according to UE processing capability 1 and UE processing capability 2. Here μ corresponds to the downlink subcarrier spacing and uplink subcarrier spacing (μ DL ,μ UL ) will produce a larger T in the sequence number proc,2 The μ value of .

[0157] 2)κ=T s / T c =64. In the NR system, Tc is a time unit, T c =1 / (Δf max ·N f ) where Δf max =480·10 3 Hz and N f =4096; κ represents the ratio between Ts and Tc, and takes a fixed value of κ = T s / T c =64. Where T s =1 / (Δf ref ·N f,ref ),Δf ref =15·10 3Hz and N f,ref =2048.

[0158] 3) If the first symbol of PUSCH contains only DMRS, then d 2,1 =0, otherwise d 2,1 =1.

[0159] 4)(N 2 +d 2,1 )(2048+144)·κ2 -μ ·T C This item corresponds to the PDCCH analysis time and PUSCH preparation time when bandwidth part (BWP) switching is not considered.

[0160] 5) If the scheduling DCI triggers the BWP switch, d 2,2 Equal to the BWP switching time, otherwise d 2,2 =0.

[0161] Table 6 PUSCH preparation time for UE processing capability 1

[0162] μ <![CDATA[PUSCH preparation time N 2 (Symbol)]]> 0 10 1 12 2 23 3 36

[0163] Table 7 PUSCH preparation time for UE processing capability 2

[0164] μ <![CDATA[PUSCH preparation time N 2 (Symbol)]]> 0 5 1 5.5 2 11 for frequency range 1 (in frequency range 1)

[0165] As can be seen from the above, currently, DCI can be carried by PDCCH, but for terminal devices, the number of PDCCH candidates that the terminal devices need to perform blind detection is large, and the power consumption is large. Moreover, if multiple terminal devices are scheduled to transmit data on PDCCH, the terminal devices may fail to receive DCI because the time and frequency resources of PDCCH are limited.

[0166] As mentioned above, DMRS can be used on the time-frequency resources of PDSCH, and the terminal device performs channel estimation of PDSCH according to the received DMRS to obtain channel estimates of different symbols of PDSCH, so that the terminal device can demodulate and decode PDSCH according to the channel estimation result.

[0167] At present, it is proposed that DCI can be sent on PDSCH. Considering that PDSCH is sent to a specific terminal device, if DCI sent to the terminal device is carried on PDSCH, the resources for the terminal device to receive DCI are on the specific time-frequency resources of PDSCH. The terminal device only needs to demodulate and decode DCI on the specific time-frequency resources without blind detection. However, how to determine the resources carrying DCI on the time-frequency resources of PDSCH and improve the transmission performance of DCI is an urgent problem to be solved.

[0168] In this regard, the present application proposes a method for transmitting a control channel, in which the method can carry DMRS on the time-frequency resources of PDSCH, and determine the time-frequency resources of the DCI carried on the time-frequency resources of the PDSCH according to the time-frequency resources of the PDSCH, or according to the time-frequency resources of the DMRS carried on the PDSCH. In this way, considering that the PDSCH is sent to a specific terminal device, the number of times the terminal device detects DCI can be reduced, and the power consumption of the terminal device can be reduced. Moreover, when the time-frequency resources of the DCI carried on the time-frequency resources of the PDSCH are determined according to the time-frequency resources of the PDSCH, or according to the time-frequency resources of the DMRS carried on the PDSCH, the delay, the channel estimation performance when the DMRS performs channel estimation, and the complexity of the terminal device are comprehensively considered to determine the DCI resources that improve the transmission performance of the DCI.

[0169] like Figure 6 The figure shows a flow chart of a method for transmitting control information, which includes the following process.

[0170] 601. A network device sends indication information to a terminal device, where the indication information indicates a first time-frequency resource for carrying a first downlink data channel, where the first time-frequency resource includes a third time-frequency resource, and the third time-frequency resource is used to carry a demodulation reference signal of the first downlink data channel. Correspondingly, the terminal device receives the indication information from the network device.

[0171] The embodiment of the present application is described by taking the terminal device as UE and the network device as a wireless access network device, such as a base station as an example.

[0172] Exemplarily, the first downlink data channel is a first PDSCH, and the first time-frequency resource is a time-frequency resource of the first PDSCH.

[0173] The base station sends indication information to the UE, including: the base station sends DCI to the UE, and the DCI includes indication information. For example, the indication information indicates the offset K0, the starting symbol S, and the number of continuous symbols L of the first time-frequency resource in the time domain relative to the PDCCH time slot. In some embodiments, if the subcarrier spacing of the PDCCH is the same as the subcarrier spacing of the first PDSCH, K0=0 indicates that the first PDSCH and the PDCCH are scheduled in the same time slot, and K0=1 indicates that the first PDSCH is scheduled in the next time slot of the PDCCH. Alternatively, the base station sends indication information to the UE, including: the base station sends high-level information to the UE, and the high-level information includes indication information.

[0174] Among them, if the indication information is included in the DCI, this DCI can be the first-level DCI in the two-level DCI, or it can be the traditional first-level DCI, which is not limited in this application. The two-level DCI includes the first-level DCI and the second-level DCI, wherein the first-level DCI indicates the reception information of the second-level DCI, for example, the first-level DCI indicates the reception resources of the second-level DCI or the number of information bits of the second-level DCI. In some embodiments, the first-level DCI and the second-level DCI are used to schedule data transmission in the first cell. The first-level DCI and the second-level DCI are not exactly the same. Data transmission in the first cell cannot be performed only based on the first-level DCI; data transmission in the first cell cannot be performed only based on the second-level DCI. The first-level DCI and the second-level DCI are also used to schedule data transmission in the second cell, and the second cell is different from the first cell.

[0175] In some embodiments, the first-level DCI and the second-level DCI are not exactly the same. Data transmission of the first carrier cannot be performed based on the first-level DCI alone; data transmission of the first carrier cannot be performed based on the second-level DCI alone. The first-level DCI and the second-level DCI are also used to schedule data transmission of the second carrier, and the second carrier is different from the first carrier. The first carrier and the second carrier can be the uplink carrier and the downlink carrier of the same cell, or the uplink carrier of different cells, or the downlink carrier of different cells.

[0176] 602. The network device sends first downlink control information to the terminal device on a second time-frequency resource, where the second time-frequency resource is part of the first time-frequency resource, and the first downlink control information indicates a time-frequency resource used to carry a second data channel. Accordingly, the terminal device receives the first downlink control information from the network device on the second time-frequency resource.

[0177] The second time-frequency resource is determined based on the first symbol of the first time-frequency resource, or the second time-frequency resource is determined based on the third time-frequency resource.

[0178] In some embodiments, the network device may determine the second time-frequency resource based on the first time-frequency resource, or determine the second time-frequency resource based on the first time-frequency resource and the third time-frequency resource carrying the DMRS of the first PDSCH. Then, the network device sends the first DCI to the terminal device on the second time-frequency resource.

[0179] Accordingly, after receiving the indication information, the terminal device can determine the second time-frequency resource according to the first time-frequency resource, or determine the second time-frequency resource according to the first time-frequency resource and the third time-frequency resource of the DMRS carrying the first PDSCH. Then, the terminal device receives the first DCI sent by the network device on the second time-frequency resource.

[0180] The first DCI is used to schedule an uplink channel or a downlink channel, or to schedule an uplink signal or a downlink signal. When the first DCI indicates the time-frequency resources used to carry the second data channel, when the second data channel is an uplink channel, the uplink channel may be a PUSCH, and when the second data channel is a downlink channel, the downlink channel may be a PDSCH. The uplink signal may be a channel state information-reference signal (CSI-RS), and the downlink signal may be a sounding reference signal (SRS).

[0181] For the network device, the determination of the second time-frequency resource by the network device may occur before the network device sends the indication information, or may occur after the network device sends the indication information.

[0182] The first DCI may be a traditional first-level DCI or a second-level DCI in a two-level DCI. When the first DCI is the second-level DCI in a two-level DCI, the corresponding first-level DCI is a DCI containing indication information.

[0183] Therefore, for the terminal device, considering that PDSCH is sent to a specific terminal device, if the second time-frequency resource carrying DCI is determined on the first time-frequency resource of PDSCH, the number of blind detections of the terminal device PDCCHcandidate receiving DCI can be avoided, and the power consumption of the terminal device can be reduced. Moreover, when the second time-frequency resource carrying DCI on the first time-frequency resource is determined based on the first time-frequency resource carrying PDSCH, or based on the first time-frequency resource carrying PDSCH and the third time-frequency resource of DMRS carrying PDSCH, the delay, the channel estimation performance when DMRS performs channel estimation, and the complexity of the terminal device can be comprehensively considered to determine the DCI resource that improves the transmission performance of DCI.

[0184] The method described below on how to determine the second time-frequency resource carrying the first DCI within the first time-frequency resource is applicable to network equipment and terminal equipment.

[0185] In some embodiments, the demodulation reference signal of the first downlink data channel is N groups of demodulation reference signals, where N is a positive integer. The time domain resources of the third time-frequency resource are N groups of symbols, and the nth group of symbols in the N groups of symbols carries the nth group of demodulation reference signals of the N groups of demodulation reference signals; wherein any group of the N groups of symbols is one symbol or two consecutive symbols; when N is greater than or equal to 2, the time domain between any two groups of the N groups of symbols is not continuous, and n is a positive integer greater than or equal to 1 and less than or equal to N.

[0186] That is, when the DMRS of the first PDSCH is N groups of DMRS, the time domain resources of the third time-frequency resources are N groups of symbols. Figure 2 , in the single-symbol mode of the DMRS of the first PDSCH, when the dmrs-Additional Position is pos1, the DMRS of the first PDSCH is 2 groups of DMRS, the time domain resources of the third time-frequency resources are 2 groups of symbols, the first group of symbols (symbol 2) carries the first group of DMRS, the second group of symbols (symbol 11) carries the second group of DMRS, and the time domain between the first group of symbols and the second group of symbols is not continuous. Similarly, if in the dual-symbol mode of the DMRS of the first PDSCH, when the dmrs-Additional Position is pos1, for example, the first group of symbols (symbols 2 and 3) carries the first group of DMRS, and the second group of symbols (symbols 11 and 12) carries the second group of DMRS, the time domain between the first group of symbols and the second group of symbols is not continuous.

[0187] The following examples illustrate various implementation methods for determining the second time-frequency resource carrying the first DCI within the first time-frequency resource.

[0188] In method 1, the first DCI may be carried on M consecutive symbols starting from a certain symbol of the first PDSCH.

[0189] In some embodiments, the second time-frequency resource is part or all of the time-frequency resource on each of M symbols starting from the first symbol in the first time-frequency resource, where M is an integer greater than or equal to 1. In other words, on any symbol in the M symbols, the frequency domain range of the second time-frequency resource is less than or equal to the frequency domain range of the first time-frequency resource.

[0190] Assume that the mapping type of the first PDSCH is mapping type A, the indication information indicates that in the time domain information of the first PDSCH, the starting symbol S=2, the number of continuous symbols L=11, and the second time-frequency resource used to carry the first DCI is part or all of the time-frequency resources on each symbol of the M symbols starting from symbol 2. Figure 7 (a) in FIG. 1 is a schematic diagram showing a second time-frequency resource on a first time-frequency resource of a first PDSCH. For example, when M is 2 and symbol 2 does not carry DMRS, the second time-frequency resource used to carry the first DCI is 2 symbols starting from symbol 2, that is, all time-frequency resources on symbol 2 and part or all time-frequency resources on symbol 3. In this case, if Figure 2 On the third time-frequency resource shown, there is DMRS transmission on symbol 2, but DMRS occupies part of the time-frequency resources of symbol 2, and the remaining resources on symbol 2 can be used to carry the first DCI. The second time domain resources used to carry the first DCI can be part of the time-frequency resources on symbol 2 and part or all of the time-frequency resources on symbol 3.

[0191] In this way, when the first DCI is carried on the first PDSCH, if the first DCI is sent starting from the first symbol of the first PDSCH resource, the delay of the UE receiving the first DCI is small.

[0192] In some embodiments, the second time-frequency resource is part or all of the time-frequency resource on each symbol of M symbols starting from the first symbol of the N group of symbols in the first time-frequency resource.

[0193] like Figure 7 (b) in the figure shows a schematic diagram of a second time-frequency resource. Assume that the dmrs-AdditionalPosition configured by the high-level layer is pos1. In the first time-frequency resource of the first PDSCH, the first symbol is symbol 2, and the N groups of symbols carrying DMRS are 2 groups of symbols, one group of symbols is symbol 2, and the other group of symbols is symbol 11. The second time-frequency resource carrying the first DCI is part or all of the time-frequency resources on each of the M symbols starting from symbol 2. For example, when M=2, the second time-frequency resource carrying the first DCI is the 2 symbols starting from symbol 2, that is, part or all of the time-frequency resources on symbol 2 and symbol 3. Here, if DMRS does not occupy all the time-frequency resources of symbol 2 on symbol 2, the first DCI can occupy part of the time-frequency resources on symbol 2 and part or all of the time-frequency resources on symbol 3.

[0194] In this way, considering that the channel estimation quality on the symbol where the DMRS is located is guaranteed to a certain extent, it is ensured that the delay of the first DCI is small and the channel estimation performance of the UE receiving the first DCI can be improved.

[0195] In some embodiments, the second time-frequency resource is part or all of the time-frequency resource on each symbol of M symbols starting from the first symbol after the first group of symbols of N groups of symbols in the first time-frequency resource.

[0196] like Figure 7(c) in the figure shows a schematic diagram of a second time-frequency resource. Assuming that the dmrs-AdditionalPosition configured by the high-level layer is pos1, in the first time-frequency resource of the first PDSCH, the first symbol is symbol 0, the N groups of symbols carrying DMRS are 2 groups of symbols, one group of symbols is symbol 2, and the other group of symbols is symbol 11. The second time-frequency resource carrying the first DCI is part or all of the time-frequency resources on each symbol of the M symbols starting from symbol 3 after symbol 2. For example, when M is 2, the second time-frequency resource carrying the first DCI is part or all of the time-frequency resources on symbols 3 and 4.

[0197] This is because if the first DCI occupies the symbol where the DMRS is located, the base station and the UE avoid the DMRS to perform resource mapping for the first DCI, and the implementation complexity of the base station and the UE is relatively high. If the first DCI is transmitted starting from the first symbol after the first group of N groups of DMRS symbols, a compromise can be made between the delay of the first DCI, the channel estimation performance and the implementation complexity.

[0198] Mode 2: When N is 1, the second time-frequency resource is part or all of the time-frequency resources on the M symbols closest to the N groups of symbols in the time domain in the first time-frequency resource. In other words, on any symbol of the M symbols, the frequency domain range of the second time-frequency resource is less than or equal to the frequency domain range of the first time-frequency resource.

[0199] That is, if there is only one group of symbols on the first time-frequency resource of the first PDSCH for carrying DMRS, the first time-frequency resource carrying the first DCI may be part or all of the time-frequency resources on the M symbols closest to the one group of symbols in the time domain.

[0200] For example, Figure 7 (d) in FIG. 1 is a schematic diagram of a second time-frequency resource. Assume that the starting symbol of the first time-frequency resource of the first PDSCH is symbol 0, the length is 14, and there is only one group of symbols on the first time-frequency resource for carrying DMRS, that is, in the case of pos0, when this group of symbols is symbol 2, part or all of the time-frequency resources on symbol 2 and the M symbols closest to symbol 2 in the time domain can be selected. For example, when M is 2, part or all of the time-frequency resources on symbol 2 and symbol 1 can be selected to carry the first DCI ( Figure 7 Alternatively, some or all of the time-frequency resources on symbol 2 and symbol 3 may be selected to carry the first DCI. Alternatively, some or all of the time-frequency resources on symbol 1 and symbol 3 may be selected to carry the first DCI. The specific method of selecting the symbol for carrying the first DCI according to the order of distance from the DMRS symbol may be a high-level configuration.

[0201] In this way, considering that there is only one group of symbols on the first time-frequency resource of the first PDSCH used to carry DMRS, the channel estimation quality of the symbols carrying DMRS is the best, and the channel estimation quality decreases from good to bad as the distance from this group of symbols increases. If the UE selects part or all of the time-frequency resources on the M symbols closest to this group of symbols in the time domain to carry the first DCI, the channel estimation performance of the first DCI can be improved, thereby improving the data transmission efficiency on the UE side.

[0202] Mode 3: When N is greater than or equal to 2, the second time-frequency resource is part or all of the time-frequency resources on the M symbols closest to the second symbol in the time domain in the first time-frequency resource. In other words, on any one of the M symbols, the frequency domain range of the second time-frequency resource is less than or equal to the frequency domain range of the first time-frequency resource. The second symbol is a symbol between the first symbol of the N groups of symbols and the first symbol, the first symbol is the first symbol of a group of symbols other than the first symbol in the N groups of symbols, and the second symbol and the first symbol are not continuous in time domain.

[0203] That is, on the first time-frequency resource of the first PDSCH, if there are at least two groups of symbols for carrying DMRS, the second time-frequency resource for carrying the first DCI may be determined on the PDSCH symbol between the two groups of symbols.

[0204] Various possibilities for the first symbol are illustrated here.

[0205] In some embodiments, the first symbol is the first symbol of the last group of N symbols.

[0206] For example, Figure 8 (a) in FIG. 1 is a schematic diagram of a second time-frequency resource. Assume that the dmrs-AdditionalPosition configured by the high layer is pos1. In the first time-frequency resource of the first PDSCH (starting symbol is 2 and length is 11), if the DMRS is in single symbol mode, the N groups of symbols carrying the DMRS are 2 groups of symbols, one group of symbols is symbol 2, the other group of symbols is symbol 11, and the first symbol is symbol 11. Or, for Figure 8 As not shown in (a), if the DMRS is in dual-symbol mode, the first group of symbols is symbols 2 and 3, the other group of symbols is symbols 11 and 12, and the first symbol is symbol 11.

[0207] for Figure 8The DMRS shown in (a) is in single symbol mode, the second symbol is a symbol between symbol 2 and symbol 11, and the second symbol and symbol 2 are not continuous in time domain. The second symbol can be a symbol from symbol 4 to symbol 10. Considering the case of pos1, when the channel estimate is obtained by interpolating symbol 2 and symbol 11, the channel estimation quality of symbols 6 and 7 between symbol 2 and symbol 11 is the best, the second symbol can be symbol 6 or 7, and the second time-frequency resource is part or all of the time-frequency resources on the M symbols closest to symbol 6 or symbol 7 in the time domain in the first time-frequency resource of the first PDSCH. For example, when the second symbol is symbol 6, if M=2, the first DCI can be carried on part or all of the time-frequency resources on symbol 6 and symbol 7 (such as Figure 8 (as shown in (a)), or part or all of the time-frequency resources carried on symbols 5 and 6.

[0208] Optionally, for the multiple second time-frequency resources exemplified above, part or all of the time-frequency resources on symbols 5 and 6 can be preferentially selected as the second time-frequency resources, so that the delay of the first DCI is smaller, and when the channel estimate of the first DCI is obtained by DMRS interpolation, the channel estimate quality of the first DCI is better.

[0209] like Figure 8 (b) in FIG. 1 is a schematic diagram of a second time-frequency resource. Assume that the dmrs-AdditionalPosition configured by the high-level layer is pos2. Figure 8 (b) shows that the DMRS is in single-symbol mode. In the first time-frequency resource of the first PDSCH, the N groups of symbols carrying DMRS are 3 groups of symbols, the first group of symbols is symbol 2, the second group of symbols is symbol 7, the third group of symbols is symbol 11, and the first symbol is symbol 11. The second symbol can be a symbol between symbol 2 and symbol 11, and the second symbol and symbol 2 are not continuous in time domain. For example, the second symbol can be a symbol on symbols 4 to 10. Considering that when the channel estimation of DMRS is interpolated to obtain the channel estimation, the channel estimation quality of the center symbol between DMRS symbols is better, assuming M=2, the second time-frequency resources, for example, part or all of the time-frequency resources on optional symbols 5 and 6 (such as Figure 8 As shown in (b) in the figure, the symbols occupied by the first DCI are continuous, and the channel estimates on symbols 5 and 6 can be interpolated from the channel estimates of the DMRS on symbols 2, 7, and 11. Alternatively, part or all of the time-frequency resources on symbols 8 and 9 are selected, or part or all of the time-frequency resources on symbols 6 and 8 are selected. Alternatively, if the first DCI can occupy DMRS symbols and there are remaining time-frequency resources on symbol 7, part or all of the time-frequency resources on symbol 6 and part of the remaining time-frequency resources on symbol 7 can also be selected.

[0210] Optionally, for the multiple second time-frequency resources exemplified above, part or all of the time-frequency resources on symbols 5 and 6 may be preferentially selected as the second time-frequency resources, which may reduce the delay of the first DCI.

[0211] In this way, when the second time-frequency resource carrying the first DCI is between the first group of symbols and the last group of symbols of DMRS, considering that the channel estimation of the first DCI obtained by the UE through channel estimation interpolation of DMRS, the channel estimation quality of the central symbol between the DMRS symbols is better, which can improve the channel estimation performance of the first DCI obtained by the UE.

[0212] In some embodiments, the first symbol is the earliest symbol in the time domain that can meet the following conditions: the time-frequency resources between the first group of symbols and the first symbol that can be used to carry the first downlink control information are greater than or equal to the time-frequency resources required by the first downlink control information.

[0213] In this way, the base station or UE first determines the time-frequency resource size required for the first DCI, for example, determines the number of resource elements (REs) required for the first DCI. Then, the first symbol is determined, and the first symbol can be understood as the earliest DMRS symbol that can ensure that the first DCI is carried between the first group of symbols and the first symbol.

[0214] For example, Figure 8 (c) in FIG. 1 is a schematic diagram of a second time-frequency resource. Figure 8 In the case of pos2, the DMRS shown in (c) is in single symbol mode, and N groups of symbols are 3 groups of symbols, the first group of symbols is symbol 2, the second group of symbols is symbol 7, and the third group of symbols is symbol 11. If it is determined that the first DCI needs to occupy the full 3 symbols according to the number of REs of the first DCI, that is, when M=3, the first symbol can be symbol 7 without occupying DMRS symbols. The second symbol can be symbol 4, 5 or 6. The 3 symbols occupied by the second time-frequency resources can be, for example, symbols 4, 5 and 6.

[0215] like Figure 8 (d) in FIG. 1 is a schematic diagram of a second time-frequency resource. Figure 8 (d) in FIG. 1 shows that the DMRS is in single symbol mode. For the case of pos3, N groups of symbols are 4 groups of symbols, the first group of symbols is symbol 2, the second group of symbols is symbol 5, the third group of symbols is symbol 8, and the fourth group of symbols is symbol 11. If the first DCI needs to occupy two complete symbols according to the number of REs of the first DCI, that is, when M=2, without occupying DMRS symbols, the first symbol can be symbol 5, the second symbol can be symbol 4, and the two symbols required for the first DCI are symbols 3 and 4 (in Figure 8If the first DCI needs to occupy three complete symbols according to the number of REs of the first DCI, that is, when M=3, without occupying DMRS symbols, the first symbol can be symbol 8, the second symbol can be symbol 4, 6 or 7, and the three symbols required for the first DCI can be symbols 3, 4 and 6, or symbols 4, 6, 7, etc. (in Figure 8 (d) is not shown in FIG.

[0216] In some embodiments, the first symbol is a symbol in a group of N symbols indicated by signaling or specified by a protocol.

[0217] For example, assuming that Figure 8 In the case of pos2 in the single symbol mode shown in (c) of FIG. 1 , if the first symbol is defined as symbol 7, the M symbols required for the first DCI are 3 symbols, and the second symbol is symbol 4, 5, or 6, the M symbols can be symbols 3 to 5, or symbols 4 to 5. Assume that Figure 8 In the case of pos2 in the single symbol mode shown in (d), if the first symbol is specified as symbol 5, the M symbols required for the first DCI are 2 symbols, the second symbol is symbol 4, and the M symbols can be symbols 3 and 4. The base station needs to determine the encoding and rate matching method of the first DCI to ensure that the first DCI can be carried on the first group of symbols, that is, symbols 3 and 4 between symbols 2 and 5.

[0218] Thus, for the cases of pos2 and pos3, when the first DCI is carried between the first group of symbols and the first symbol of the N groups of symbols. When the first symbol is not the last symbol of the N groups of symbols, the UE can use part of the DMRS channel estimation of the first PDSCH to perform channel estimation of the first DCI, ensuring that the channel estimation of the first DCI is obtained by interpolating the channel estimation using the DMRS, thereby improving the channel estimation quality of the first DCI obtained by the UE. Moreover, when the UE uses part of the DMRS on the first PDSCH to perform channel estimation of the first DCI, the data channel delay from the first DCI to the first DCI scheduling can be reduced.

[0219] In the above-mentioned multiple implementation methods of determining the second time-frequency resources, the M symbols may be: symbols that are continuous in the time domain; or symbols other than the first category of symbols among the symbols that are continuous in the time domain.

[0220] Among them, the first type of symbol includes time-frequency resources that cannot be used to transmit the first DCI. Furthermore, in the first time-frequency resource, the first type of symbol includes time-frequency resources that cannot be used to transmit the first DCI. That is, if a symbol of the first time-frequency resource includes time-frequency resources that cannot be used to transmit the first DCI, but the frequency domain resources of the time-frequency resources that cannot be used to transmit the first DCI are not included in the frequency domain resources of the first time-frequency resource, then this symbol is not a first type of symbol; if a symbol of the first time-frequency resource includes time-frequency resources that cannot be used to transmit the first DCI, and the frequency domain resources of the time-frequency resources that cannot be used to transmit the first DCI are included in the frequency domain resources of the first time-frequency resource, then this symbol is a first type of symbol. The first type of symbol includes at least one of the following: a symbol where the indication information is located; a symbol in N groups of symbols; a symbol containing rate matching resources. Furthermore, the first type of symbol is a symbol containing indication information in the first time-frequency resource; and / or, a symbol in N groups of symbols; and / or, a symbol containing rate matching resources.

[0221] If the M symbols used to carry the first DCI are continuous symbols in the time domain, for the base station and the UE, the delay of sending / receiving the first DCI is small.

[0222] If the M symbols are symbols other than the first type of symbols in the time domain continuous symbols, illustratively, it is assumed that the indication information indicates that the first time-frequency resource of the first PDSCH is 14 symbols in the time domain: symbols 0 to 11. Symbols 0 and 1 are used to carry the indication information, the first time-frequency resource may not be regular, and symbols 0 and 1 are not used to map the second time-frequency resource carrying the first DCI. If symbols 0 and 1 are not used to carry the indication information, or the CORESET that overlaps with the time-frequency resource where the first PDSCH is located does not contain the indication information, symbols 0 and 1 can be used to map the second radio frequency resource carrying the first DCI.

[0223] In this case, the base station and the UE may be that when the terminal device reports that it does not support receiving the first DCI on the CORESET carrying the indication information, the first type of symbol includes the symbol where the indication information is located. That is, the UE may report the capability to the network device to indicate whether it supports receiving the first DCI carried on the first PDSCH on the CORESET carrying the DCI.

[0224] Furthermore, when the base station and the UE determine the second time-frequency resource carrying the first DCI, the symbols in the N groups of symbols carrying the DMRS may be skipped, that is, the symbols carrying the DMRS are not used to map the second radio frequency resource carrying the first DCI. Figure 8As shown in (b), when the two symbols carrying the first DCI are continuous in the time domain, part or all of the time-frequency resources on symbols 5 and 6 can be selected, or part or all of the time-frequency resources on symbols 8 and 9 can be selected, or part or all of the time-frequency resources on symbols 6 and 8 can be selected, but part of the time-frequency resources on symbol 7 are not selected, that is, symbols 6 and 7, or symbols 7 and 8 cannot be selected as the two symbols.

[0225] In this case, the base station and the UE may determine that the first type of symbols includes symbols in the N group of symbols when the UE reports that it does not support receiving the first DCI on the N group of symbols. That is, whether to receive the first DCI on the N group of symbols is determined according to the capability of the terminal device.

[0226] Furthermore, if the M symbols do not contain symbols of rate matching resources, the network device does not need to perform rate matching when sending the first DCI on the M symbols, and the terminal device does not need to perform rate matching when receiving the first DCI on the M symbols. The transmission efficiency of the first DCI is high and the delay is small. Figure 8 In the example of (a), the sequence number is incremented starting from symbol 6 with the best channel estimation quality, and symbols 6 and 7 may be selected. However, if symbol 7 is a symbol that needs rate matching, when the M symbols are continuous in the time domain, the sequence number may be decremented starting from symbol 6, and symbols 5 and 6 may be used to carry the first DCI.

[0227] It should be noted that in the above-mentioned implementation methods of selecting the M symbols for carrying the first DCI, when selecting the M symbols, the selection may not be in the order of increasing or decreasing sequence numbers of the symbols. However, after the symbol selection is completed, the network device may send the first DCI in the order of increasing sequence numbers of the selected M symbols, and the terminal device also receives the M symbols in the order of increasing sequence numbers. For example, Figure 7 In the example (d), when the two symbols selected to carry the first DCI are symbols 1 and 3, symbol 3 may be selected first and then symbol 1, but when sending the first DCI, the first DCI is sent starting from symbol 1 in the order of increasing sequence numbers of symbol 1 and symbol 3.

[0228] In some embodiments, when a terminal device receives a first DCI and DMRS on a first time-frequency resource of a first PDSCH, the terminal device may determine part or all of the DMRS carried in the first time-frequency resource for channel estimation of the first DCI, so as to demodulate and decode the first DCI based on part or all of the DMRS.

[0229] How to determine the DMRS on the first time-frequency resource for performing channel estimation for the first DCI, multiple possible implementations are given below.

[0230] In mode A, the demodulation reference signal of the first downlink data channel carried on all symbol groups in N groups of symbols is used to estimate the channels of all symbols of the second time-frequency resources.

[0231] That is, the DMRS of the first PDSCH carried on all symbols in the N groups of symbols is used to estimate the channels of all symbols carrying the first DCI.

[0232] For example, in Figure 8 In the second time-frequency resource mode shown in (a), DMRS occupies 2 groups of symbols, namely symbols 2 and 11, and the DMRS carried on symbols 2 and 11 are used to estimate the channels of symbols 6 and 7 carrying the first DCI.

[0233] exist Figure 8 In the second time-frequency resource mode shown in (b), when DMRS occupies 3 groups of symbols, symbols 2, 7 and 11 corresponding to these 3 groups of symbols are used to estimate the channels of symbols 5 and 6 carrying the first DCI.

[0234] exist Figure 8 In the second time-frequency resource mode shown in (d), when DMRS occupies 4 groups of symbols and M=2, symbols 2, 5, 8 and 11 corresponding to these 4 groups of symbols are used to estimate the channels of symbols 3 and 4 carrying the first DCI.

[0235] Considering that the channel estimation of the first DCI is performed using the DMRS of all PDSCHs, the channel estimation quality obtained by interpolation is better. If the channel estimation of all symbols carrying the first DCI is obtained by interpolation, the channel estimation quality of the first DCI is better, which is beneficial for the terminal device to demodulate and decode the first DCI. In this method A for performing channel estimation for the first DCI, when the first symbol is the first symbol of the last group of symbols of N groups of symbols, the channel estimation quality of the first DCI obtained is better.

[0236] Method B, when N is greater than or equal to 2:

[0237] In the N groups of symbols, the demodulation reference signal of the first downlink data channel carried on the earliest symbol group after the end symbol of the second time-frequency resource and all symbol groups before the earliest symbol group is used to estimate the channel of all symbols of the second time-frequency resource. The demodulation reference signal of the first downlink data channel carried on all symbol groups after the earliest symbol group is not used to estimate the channel of all symbols of the second time-frequency resource.

[0238] For example, in Figure 8In the second time-frequency resource mode shown in (c), when DMRS occupies 3 groups of symbols, although these 3 groups of symbols correspond to symbols 2, 7 and 11, when the selected second time-frequency resource carrying the first DCI is symbols 4, 5 and 6, the end symbol of the second time-frequency resource is symbol 6, the earliest symbol group after symbol 6 is symbol 7, and all symbol groups before symbol 7 are symbol 2, then only the DMRS of the first PDSCH carried on symbols 2 and 7 is used to estimate the channels of symbols 4, 5 and 6.

[0239] exist Figure 8 In the second time-frequency resource mode shown in (d), when DMRS occupies 4 groups of symbols, although these 4 groups of symbols correspond to symbols 2, 5, 8 and 11, when the second time-frequency resource selected to carry the first DCI is symbols 3 and 4, the end symbol of the second time-frequency resource is symbol 4, the earliest symbol group after symbol 4 is symbol 5, and all symbol groups before symbol 5 are symbol 2, then only the DMRS of the first PDSCH carried on symbols 2 and 5 is used to estimate the channels of symbols 3 and 4.

[0240] In this way, not only is it ensured that the channel estimation of the first DCI is obtained through DMRS interpolation and the channel estimation quality of the first DCI is good, but also it is ensured that the delay of the channel estimation of the first DCI obtained by interpolation is small.

[0241] Or, in N groups of symbols, the demodulation reference signal of the first downlink data channel carried on the symbol group where the end symbol of the second time-frequency resource is located and all symbol groups before the symbol group where the end symbol of the second time-frequency resource is located is used to estimate the channel of all symbols of the second time-frequency resource. The demodulation reference signal of the first downlink data channel carried on all symbol groups after the symbol group where the end symbol of the second time-frequency resource is located is not used to estimate the channel of all symbols of the second time-frequency resource.

[0242] That is, if the end symbol of the second time-frequency resource carrying the first DCI is a symbol in N groups of symbols, the DMRS carried on the symbol group where the end symbol is located and all previous symbol groups are used to estimate the channels of all symbols of the second time-frequency resource carrying the first DCI.

[0243] For example, assuming that Figure 8 In the DMRS carrying method shown in (d), if a DMRS symbol can be selected to carry the first DCI, and the second time-frequency resources carrying the first DCI are symbols 3, 4 and 5 (the first DCI occupies part of the time-frequency resources of symbol 5), and the end symbol of the second time-frequency resources is symbol 5, then symbol 5 and the DMRS of the first PDSCH carried on symbol 2 are used to estimate the channels of all symbols 3, 4 and 5 of the second time-frequency resources carrying the first DCI.

[0244] Similarly, this not only ensures that the channel estimation of the first DCI is obtained by interpolating the channel estimation of the DMRS, and the channel estimation quality on the symbol carrying the first DCI is good, but also ensures that the delay of the interpolated channel estimation of the symbol carrying the first DCI is small.

[0245] Mode C: In N groups of symbols, the demodulation reference signal of the first downlink data channel carried on all symbol groups before the end time of the end symbol of the second time-frequency resource is used to estimate the channels of all symbols of the second time-frequency resource. The demodulation reference signal of the first downlink data channel carried on all symbol groups after all symbol groups before the end time of the end symbol of the second time-frequency resource is not used to estimate the channels of all symbols of the second time-frequency resource.

[0246] For example, in Figure 8 In the second time-frequency resource mode shown in (c), when DMRS occupies 3 groups of symbols, although these 3 groups of symbols correspond to symbols 2, 7 and 11, when the second time-frequency resource selected to carry the first DCI is symbols 4, 5 and 6, the end symbol of the second time-frequency resource is symbol 6, and all symbol groups before the end time of symbol 6 are symbol 2, then only the DMRS of the first PDSCH carried on symbol 2 is used to estimate the channels of symbols 4, 5 and 6.

[0247] exist Figure 8 In the DMRS carrying method shown in (d), when DMRS occupies 4 groups of symbols, although these 4 groups of symbols correspond to symbols 2, 5, 8 and 11, if the second time-frequency resource selected to carry the first DCI is symbols 3, 4 and 6, the end symbol of the second time-frequency resource is symbol 6, and all symbol groups before the end time of symbol 6 are symbols 2 and symbol 5, then only the DMRS of the first PDSCH carried on symbols 2 and 5 is used to estimate the channels of symbols 3, 4 and 6.

[0248] In this way, if the DMRS symbol before the end time of the first DCI is used to obtain the channel estimate of the symbol carrying the first DCI, for the terminal device, the DMRS symbol used to obtain the channel estimate of the symbol carrying the first DCI is received earlier than the first DCI, which can reduce the delay for the UE to obtain the channel estimate of the symbol carrying the first DCI, thereby improving the demodulation and decoding efficiency of the terminal device for the first DCI.

[0249] In addition, as stated above, Figure 4As shown in FIG. 1 , if the PDCCH carries DCI, the DCI is used to schedule the PDSCH. There is a minimum time interval between the start symbol of the PDSCH and the end symbol of the PDCCH. The minimum time interval is related to the subcarrier spacing of the PDSCH and the subcarrier spacing of the PDCCH. Figure 5 As shown in the figure, if the PDCCH carries DCI, the DCI is used to schedule the PUSCH, and there is also a minimum time interval between the start symbol of the PUSCH and the end symbol of the PDCCH, which is not less than T proc,2 Similarly, in the case where the present application carries DMRS and the first DCI on the first PDSCH, considering that the channel estimation of the first DCI needs to be determined using the channel estimation of the DMRS on the first PDSCH, the embodiment of the present application can also determine the minimum time interval between the first DCI and the data channel scheduled by the first DCI based on the symbol carrying the DMRS, so that within the minimum time interval, the terminal device can complete the channel estimation, demodulation and decoding of the first DCI, and prepare for the transmission of the data channel scheduled by the first DCI.

[0250] Therefore, after step 602, if Figure 6 The figure is a schematic flow chart of a method for transmitting a control channel. The method of the embodiment of the present application may further include:

[0251] 603. The terminal device determines the time interval between the first downlink control information and the second data channel. If the time interval is less than the minimum time interval, the terminal device does not receive the second data channel or does not send the second data channel.

[0252] In other words, the terminal device does not expect the time interval between the first downlink control information and the second data channel to be less than the minimum time interval. However, when the terminal device receives the first downlink control information, and the time interval between the first downlink control information and the second data channel is less than the minimum time interval, the terminal device considers that the first downlink control information is invalid.

[0253] Exemplarily, if the first DCI carried on the first PDSCH is used to schedule PUSCH, the UE determines that the time interval between the first DCI and the PUSCH scheduled by the first DCI is less than the minimum time interval, and the terminal device does not send PUSCH. In this case, the UE does not need to prepare for PUSCH transmission.

[0254] If the first DCI carried on the first PDSCH is used to schedule PDSCH, the UE determines that the time interval between the first DCI and the PDSCH scheduled by the first DCI is less than the minimum time interval, and the terminal device does not receive the PDSCH.

[0255] In some scenarios, the first DCI carried on the first PDSCH can also be used to schedule CSI-RS. The minimum time interval determined in the present application can also be applied to the minimum time interval between the first DCI and the CSI-RS. When the UE determines that the time interval between the first DCI and the CSI-RS is less than the minimum time interval, the UE does not receive the CSI-RS.

[0256] In some scenarios, the first DCI carried on the first PDSCH may also be used to schedule SRS. The minimum time interval determined in the present application may also be applicable to the minimum time interval between the first DCI and SRS. When the UE determines that the time interval between the first DCI and SRS is less than the minimum time interval, the UE does not send SRS.

[0257] Of course, in addition to being used to schedule the above-mentioned PUSCH / PDSCH / CSI-RS / SRS, the first DCI in this application can also be used to schedule other types of uplink channels / signals and downlink channels / signals, which will not be elaborated in this application.

[0258] In the present application, how to determine the minimum time interval from the first DCI to the PUSCH / PDSCH / CSI-RS / SRS scheduled by the first DCI based on the third time-frequency resource carrying DMRS, multiple possible implementation examples are given below.

[0259] Mode a: The minimum time interval between the end symbol of the third time-frequency resource and the start symbol of the second data channel is the first time interval. The data channel can be replaced by a signal.

[0260] The first time interval is the minimum time interval between the end symbol of the second DCI and the start symbol of the data channel scheduled by the second DCI, and the second DCI is any DCI carried on the physical downlink control channel. Here, the second data channel scheduled by the first DCI and the data channel scheduled by the second DCI are both PDSCH, or both are PUSCH. Alternatively, the signal scheduled by the first DCI and the data signal scheduled by the second DCI are both CSI-RS, or both are SRS.

[0261] When the second data channel scheduled by the first DCI and the data channel scheduled by the second DCI are both PDSCH, when the subcarrier spacing of the second DCI is the same as the subcarrier spacing of the first DCI, and the subcarrier spacing of the PDSCH scheduled by the second DCI is the same as the PDSCH scheduled by the first DCI, the minimum time interval between the end symbol of the third time-frequency resource and the start symbol of the second data channel scheduled by the first DCI and the minimum time interval between the end symbol of the second DCI and the start symbol of the data channel scheduled by the second DCI are the same, and are both the first time interval.

[0262] For example, Figure 4 As shown, the second DCI and DMRS are carried on the PDCCH, the second DCI is used to schedule the PDSCH, and the first time interval is Figure 4 N shown in pdsch PDCCH symbols.

[0263] When the second data channel scheduled by the first DCI and the data channel scheduled by the second DCI are both PUSCH, the subcarrier spacing of the second DCI is the same as the subcarrier spacing of the first DCI, and the subcarrier spacing of the PUSCH scheduled by the second DCI is the same as the PUSCH scheduled by the first DCI, and the first symbols of the PUSCH scheduled by the second DCI and the PUSCH scheduled by the first DCI both contain only DMRS, or the first symbols of the PUSCH scheduled by the second DCI and the PUSCH scheduled by the first DCI both contain only data, and neither the first DCI nor the second DCI triggers BWP switching, the minimum time interval between the end symbol of the third time-frequency resource to the start symbol of the data channel scheduled by the first DCI and the minimum time interval between the end symbol of the second DCI and the start symbol of the data channel scheduled by the second DCI are the same, and are both the first time interval.

[0264] For example, Figure 5 As shown, the second DCI and DMRS are carried on the PDCCH, the second DCI is used to schedule the PUSCH, and the first time interval is T proc,2 .

[0265] That is, when the second DCI schedules PUSCH or PDSCH, the first time interval corresponding to PUSCH is different from the first time interval corresponding to PDSCH.

[0266] In the present application, if the first PDSCH carries a first DCI in addition to DMRS, the minimum time interval between the end symbol of the DMRS carried on the first time-frequency resource and the start symbol of the data channel scheduled by the first DCI is the first time interval.

[0267] The following example is for explanation when the second data channel scheduled by the first DCI and the data channel scheduled by the second DCI are both PUSCH, the subcarrier spacing of the second DCI is the same as the subcarrier spacing of the first DCI, and the subcarrier spacing of the PUSCH scheduled by the second DCI and the PUSCH scheduled by the first DCI are the same, and the first symbols of the PUSCH scheduled by the second DCI and the PUSCH scheduled by the first DCI both contain only DMRS, or the first symbols of the PUSCH scheduled by the second DCI and the PUSCH scheduled by the first DCI both contain only data, and neither the first DCI nor the second DCI triggers BWP switching.

[0268] like Fig. 9 FIG. 1 is a schematic diagram showing the minimum time interval between the first DCI and the PUSCH when the first PDSCH carries the DMRS and the first DCI. The first time interval is the existing T proc,2 Taking the definition as an example, in the case of pos2 of the single symbol mode shown in method a, the third time-frequency resource on the first PDSCH has 3 groups of symbols, the last group of symbols is symbol 11, and when the second time-frequency resource carrying the first DCI is symbol 3, the minimum time interval between symbol 11 and the start symbol of the PUSCH scheduled by the first DCI is the first time interval. That is, the start symbol of the PUSCH scheduled by the first DCI is not earlier than the moment corresponding to the first time interval after the end moment of symbol 11. If the time interval between the end time of symbol 3 and the start time of PUSCH is less than the first time interval, the terminal device does not send PUSCH.

[0269] In this way, it can be ensured that the channel estimation of the UE for the first DCI is obtained by interpolating the channel estimations of all DMRSs, and the channel estimation quality of the first DCI is relatively good.

[0270] Mode b: if the end symbol of the second time-frequency resource is after the end symbol of the N group of symbols, the minimum time interval between the end symbol of the second time-frequency resource and the start symbol of the second data channel is the first time interval.

[0271] like Fig. 9 As shown, if the DMRS carried on the first PDSCH is pos0, that is, the N groups of symbols of the third time-frequency resource carrying DMRS are 1 group of symbols, and this group of symbols is symbol 2, the second time-frequency resource carrying the first DCI occupies 1 symbol, and is symbol 3, that is, the end time of the second time-frequency resource is after the end time of the N groups of symbols, in this case, the minimum time interval between the end time of symbol 3 carrying the first DCI and the start symbol (start time) of the PUSCH scheduled by the first DCI can be used as the first time interval. If the time interval between the end time of symbol 3 and the start time of PUSCH is less than the first time interval, the terminal device does not send PUSCH.

[0272] In this way, when the DMRS is pos0, the UE can determine the channel estimation of the symbol carrying the first DCI based on the channel estimation of the DMRS received before the first DCI, thereby improving the demodulation and decoding efficiency of the first DCI. Moreover, the channel estimation quality of the first DCI can be guaranteed to be good.

[0273] Method c: if the end symbol of the second time-frequency resource is before the end symbol of N groups of symbols, in the N groups of symbols, the minimum time interval between the end symbol of the earliest symbol group after the end symbol of the second time-frequency resource and the start symbol of the second data channel is the first time interval.

[0274] For example, Fig. 9 In the method c-1 shown, if the DMRS carried on the first PDSCH is pos0, that is, the N groups of symbols of the third time-frequency resource carrying DMRS are 1 group of symbols, assuming that this group of symbols is symbol 3, the second time-frequency resource carrying the first DCI occupies 1 symbol, and is symbol 2, and the end time of symbol 2 carrying the first DCI is before symbol 3 carrying DMRS, the earliest symbol group after symbol 2, that is, the minimum time interval between the end time of symbol 3 and the PUSCH scheduled by the first DCI can be the first time interval. If the time interval between the end time of symbol 2 and the start time of PUSCH is less than the first time interval, the terminal device does not send PUSCH.

[0275] Or, if Fig. 9 In the illustrated method c-2, if the DMRS carried on the first PDSCH is pos3 and is in single symbol mode, the N groups of symbols of the third time-frequency resource carrying the DMRS are 4 groups of symbols, and these 4 groups of symbols are symbols 2, 5, 8 and 11 respectively. The second time-frequency resource carrying the first DCI occupies 1 symbol, and is symbol 3. In this way, the end time of symbol 3 carrying the first DCI is before the end time of these 4 groups of symbols (the end time of symbol 11). Then, among these 4 groups of symbols, the earliest symbol group after symbol 3 carrying the first DCI is symbol 5, and the minimum time interval between the end time of symbol 5 and the start time of the PUSCH scheduled by the first DCI is the first time interval.

[0276] Method d: If the end symbol of the second time-frequency resource is a symbol in N groups of symbols, among the N groups of symbols, the minimum time interval between the end symbol of the symbol group in the N groups of symbols overlapping with the end symbol of the second time-frequency resource and the start symbol of the second data channel is the first time interval.

[0277] Exemplarily, in the case where the DMRS carried on the first PDSCH is pos3, and it is a single symbol mode, the N groups of symbols of the third time-frequency resource carrying the DMRS are 4 groups of symbols, and the 4 groups of symbols are symbols 2, 5, 8 and 11 respectively, and the second time-frequency resource carrying the first DCI occupies 1 symbol, and is symbol 3, and the second time-frequency resource carrying the first DCI requires 3 symbols. If the time-frequency resources between the above-mentioned first group of symbols and the first symbol that can be used to carry the first DCI are greater than or equal to the time-frequency resources required for the first DCI information, and the 3 symbols required for the second time-frequency resources include one of the 4 groups of symbols, the second time-frequency resource carrying the first DCI is symbols 3, 4 and 5. In this way, the end symbol of the second time-frequency resource belongs to these 4 groups of symbols. Among these 4 groups of symbols, the symbol group overlapping with the end symbol 5 of the second time-frequency resource carrying the first DCI is symbol 5, and the minimum time interval between the end time of symbol 5 and the start time of the PUSCH scheduled by the first DCI can be used as the first time interval. If the time interval between the end symbol of the first DCI, that is, the end time of symbol 5 and the start time of PUSCH is less than the first time interval, the terminal device does not send PUSCH.

[0278] In this way, it can be ensured that the channel estimation of the first DCI is obtained by interpolating the channel estimation of the DMRS symbol, thereby improving the channel estimation performance of the first DCI.

[0279] Mode e: when N is greater than or equal to 2, the minimum time interval between the end symbol of the second time-frequency resource and the start symbol of the second data channel is the first time interval plus a preset duration.

[0280] For example, Fig. 9 In the method e shown in the figure, if the DMRS carried on the first PDSCH is pos3 and is in single symbol mode, the N groups of symbols of the third time-frequency resource carrying the DMRS are 4 groups of symbols, and the 4 groups of symbols are symbols 2, 5, 8 and 11 respectively, and the second time-frequency resource carrying the first DCI occupies 1 symbol, which is symbol 3. The minimum time interval between the end time of symbol 3 carrying the first DCI and the start time of the start symbol of the PUSCH scheduled by the first DCI can be the existing first time interval T proc,2 Add the preset duration. proc,2 With the preset duration, after receiving the first DCI, the UE can perform channel estimation, demodulation and decoding of the first DCI, and PUSCH data preparation, thereby improving the transmission efficiency of the PUSCH.

[0281] In this way, when carrying DMRS and DCI on PDSCH, the present application can take into account the DMRS used for channel estimation to determine the minimum time interval between DCI and PUSCH / PDSCH / CSI-RS, thereby improving the transmission efficiency of the DCI scheduling data channel or CSI-RS.

[0282] It is understandable that, in order to implement the functions in the above embodiments, the base station and the terminal include hardware structures and / or software modules corresponding to the execution of each function. It should be easily appreciated by those skilled in the art that, in combination with the units and method steps of each example described in the embodiments disclosed in this application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0283] Fig.10 and Fig.11 The following is a schematic diagram of the structure of possible communication devices provided in the embodiments of the present application. These communication devices can be used to implement the functions of the terminal or base station in the above method embodiments, and thus can also achieve the beneficial effects of the above method embodiments. In the embodiments of the present application, the communication device can be as follows: Figure 1 The terminal 120 shown may also be Figure 1 The base station 110 shown may also be a module (such as a chip) applied to a terminal or a base station.

[0284] like Fig.10 As shown, the communication device 1000 includes a processing unit 1010 and a transceiver unit 1020. The communication device 1000 is used to implement the above Figure 6 The functions of the terminal or base station in the method embodiment shown in FIG.

[0285] When the communication device 1000 is used to implement Figure 6 The functions of the terminal in the method embodiment shown are: the transceiver unit 1020 is used to receive the indication information and the first downlink control information; the processing unit 1010 is used to process the indication information and the first downlink control information. The processing unit 1010 can also be used to determine the time interval between the first downlink control information and the second data channel.

[0286] When the communication device 1000 is used to implement Figure 6 The functions of the base station in the method embodiment shown are: the transceiver unit 1020 is used to send indication information and first downlink control information; the processing unit 1010 is used to generate indication information and first downlink control information.

[0287] For more detailed description of the processing unit 1010 and the transceiver unit 1020, please refer to Figure 6The method embodiment shown is described in detail.

[0288] like Fig.11 As shown, the communication device 1100 includes a processor 1110 and an interface circuit 1120. The processor 1110 and the interface circuit 1120 are coupled to each other. It is understood that the interface circuit 1120 can be a transceiver or an input-output interface. Optionally, the communication device 1100 may also include a memory 1130 for storing instructions executed by the processor 1110 or storing input data required by the processor 1110 to execute instructions or storing data generated after the processor 1110 executes instructions.

[0289] When the communication device 1100 is used to implement Figure 6 When the method is shown, the processor 1110 is used to implement the functions of the above-mentioned processing unit 1010, and the interface circuit 1120 is used to implement the functions of the above-mentioned transceiver unit 1020.

[0290] When the above-mentioned communication device is a chip applied to a terminal, the terminal chip implements the functions of the terminal in the above-mentioned method embodiment. The terminal chip receives information from the base station, which can be understood as the information is first received by other modules in the terminal (such as a radio frequency module or an antenna), and then sent to the terminal chip by these modules. The terminal chip sends information to the base station, which can be understood as the information is first sent to other modules in the terminal (such as a radio frequency module or an antenna), and then sent to the base station by these modules.

[0291] When the above-mentioned communication device is a chip applied to a base station, the base station chip implements the function of the base station in the above-mentioned method embodiment. The base station chip receives information from the terminal, which can be understood as the information is first received by other modules in the base station (such as a radio frequency module or an antenna), and then sent to the base station chip by these modules. The base station chip sends information to the terminal, which can be understood as the information is sent to other modules in the base station (such as a radio frequency module or an antenna), and then sent to the terminal by these modules.

[0292] In the present application, when entity A sends information to entity B, it can be that A sends it directly to B, or that A sends it to B indirectly through other entities. Similarly, when entity B receives information from entity A, it can be that entity B directly receives the information sent by entity A, or that entity B indirectly receives the information sent by entity A through other entities. Entities A and B here can be RAN nodes or terminals, or modules inside the RAN nodes or terminals. The sending and receiving of information can be information interaction between a RAN node and a terminal, for example, information interaction between a base station and a terminal; the sending and receiving of information can also be information interaction between two RAN nodes, for example, information interaction between a CU and a DU; the sending and receiving of information can also be information interaction between different modules inside a device, for example, information interaction between a terminal chip and other modules of the terminal, or information interaction between a base station chip and other modules in the base station.

[0293] It is understandable that the processor in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0294] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, register, hard disk, mobile hard disk, CD-ROM or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a base station or a terminal. The processor and the storage medium can also be present in a base station or a terminal as discrete components.

[0295] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed on a computer, the process or function described in the embodiment of the present application is executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device or other programmable device. The computer program or instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instruction may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server, data center, etc. that integrates one or more available media. The available medium may be a magnetic medium, for example, a floppy disk, a hard disk, a tape; it may also be an optical medium, for example, a digital video disc; it may also be a semiconductor medium, for example, a solid-state hard disk. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0296] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0297] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0298] It is understood that the various numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.

Claims

1. A method for transmitting control information, characterized in that: The method comprises: Receive indication information, where the indication information indicates a first time-frequency resource used to carry a first downlink data channel, where the first time-frequency resource includes a third time-frequency resource, and the third time-frequency resource is used to carry a demodulation reference signal of the first downlink data channel; receiving first downlink control information on a second time-frequency resource, where the second time-frequency resource is a portion of the first time-frequency resource, and the first downlink control information indicates a time-frequency resource used to carry a second data channel; The second time-frequency resource is determined based on the first symbol of the first time-frequency resource, or the second time-frequency resource is determined based on the third time-frequency resource.

2. A method for transmitting control information, characterized in that: The method comprises: Sending indication information, where the indication information indicates a first time-frequency resource used to carry a first downlink data channel, where the first time-frequency resource includes a third time-frequency resource, and the third time-frequency resource is used to carry a demodulation reference signal of the first downlink data channel; Sending first downlink control information on a second time-frequency resource, where the second time-frequency resource is a portion of the first time-frequency resource, and the first downlink control information indicates a time-frequency resource used to carry a second data channel; The second time-frequency resource is determined based on the first symbol of the first time-frequency resource, or the second time-frequency resource is determined based on the third time-frequency resource.

3. The method according to claim 1 or 2, characterized in that: The demodulation reference signal of the first downlink data channel is N groups of demodulation reference signals, where N is a positive integer; The time domain resources of the third time-frequency resources are N groups of symbols, and the nth group of symbols in the N groups of symbols carries the nth group of demodulation reference signals of the N groups of demodulation reference signals; Among them, any group of the N groups of symbols is one symbol or two consecutive symbols; when N is greater than or equal to 2, any two groups of the N groups of symbols are discontinuous in time domain, and n is a positive integer greater than or equal to 1 and less than or equal to N.

4. The method according to claim 3, characterized in that: The second time-frequency resource is part or all of the time-frequency resource on each symbol of M symbols starting from the first symbol in the first time-frequency resource, and M is an integer greater than or equal to 1.

5. The method according to claim 3, characterized in that: The second time-frequency resource is part or all of the time-frequency resource on each symbol of M symbols starting from the first symbol of the N groups of symbols in the first time domain resource, where M is an integer greater than or equal to 1.

6. The method according to claim 3, characterized in that The second time-frequency resource is part or all of the time-frequency resources on each symbol of M symbols starting from the first symbol after the first group of symbols of the N groups of symbols in the first time-frequency resource, where M is an integer greater than or equal to 1.

7. The method according to claim 3, characterized in that When N is greater than or equal to 2, the second time-frequency resource is part or all of the time-frequency resources on M symbols closest to the second symbol in the time domain in the first time-frequency resource, where M is an integer greater than or equal to 1; The second symbol is a symbol between the first group of symbols of the N groups of symbols and the first symbol, the first symbol is the first symbol of a group of symbols in the N groups of symbols except the first group of symbols, and the second symbol and the first group of symbols are not continuous in time domain.

8. The method according to claim 7, characterized in that The first symbol is the first symbol of the last group of symbols of the N groups of symbols.

9. The method according to claim 7, characterized in that: The first symbol is the earliest symbol in the time domain that can meet the following conditions: The time-frequency resources between the first group of symbols and the first symbol that can be used to carry the first downlink control information are greater than or equal to the time-frequency resources required by the first downlink control information.

10. The method according to claim 7, characterized in that The first symbol is one of the N groups of symbols indicated by signaling or specified by a protocol.

11. The method according to claim 3, characterized in that When N is 1, the second time-frequency resource is part or all of the time-frequency resources on the M symbols closest to the N groups of symbols in the time domain in the first time-frequency resource.

12. The method according to any one of claims 4 to 11, characterized in that: The M symbols are: Symbols that are continuous in the time domain; or symbols other than the first category of symbols among the symbols that are continuous in the time domain; The first type of symbols includes at least one of the following: The symbol where the indication information is located; A symbol in the N groups of symbols; Contains the symbol for the rate matching resource.

13. The method according to claim 12, characterized in that When the terminal device reports that it does not support receiving the first downlink control information on the N groups of symbols, the first type of symbols includes symbols in the N groups of symbols.

14. The method according to claim 12 or 13, characterized in that When the terminal device reports that it does not support receiving the first downlink control information on the control resource set that carries the indication information, the first type of symbols includes the symbols where the indication information is located.

15. The method according to any one of claims 1 to 14, characterized in that: The minimum time interval between the end symbol of the third time-frequency resource and the start symbol of the second data channel is the first time interval.

16. The method according to any one of claims 3 to 14, characterized in that: If the end symbol of the second time-frequency resource is after the end symbol of the N group of symbols, the minimum time interval between the end symbol of the second time-frequency resource and the start symbol of the second data channel is the first time interval; If the end symbol of the second time-frequency resource is before the end symbol of the N groups of symbols, in the N groups of symbols, the minimum time interval between the end symbol of the earliest symbol group after the end symbol of the second time-frequency resource and the start symbol of the second data channel is the first time interval; If the end symbol of the second time-frequency resource is a symbol in the N groups of symbols, in the N groups of symbols, the minimum time interval between the end symbol of the symbol group in the N groups of symbols overlapping with the end symbol of the second time-frequency resource and the start symbol of the second data channel is the first time interval.

17. The method according to any one of claims 3-10, 12-14, characterized in that: When N is greater than or equal to 2, the minimum time interval between the end symbol of the second time-frequency resource and the start symbol of the second data channel is the first time interval plus a preset duration.

18. The method according to any one of claims 15 to 17, characterized in that: The first time interval is the minimum time interval between the end symbol of the second downlink control information and the start symbol of the data channel scheduled by the second downlink control information, and the second downlink control information is any downlink control information carried on the physical downlink control channel.

19. The method according to any one of claims 3 to 18, characterized in that: The demodulation reference signal of the first downlink data channel carried on all symbol groups in the N groups of symbols is used to estimate the channels of all symbols of the second time-frequency resources.

20. The method according to any one of claims 3-10, 12-18, characterized in that: When N is greater than or equal to 2: Among the N groups of symbols, the earliest symbol group after the end symbol of the second time-frequency resource and the demodulation reference signal of the first downlink data channel carried on all symbol groups before the earliest symbol group are used to estimate the channels of all symbols of the second time-frequency resource; Or, among the N groups of symbols, the demodulation reference signal of the first downlink data channel carried on the symbol group where the end symbol of the second time-frequency resource is located and all symbol groups before the symbol group where the end symbol of the second time-frequency resource is located is used to estimate the channels of all symbols of the second time-frequency resource.

21. The method according to any one of claims 3 to 18, characterized in that: In the N groups of symbols, the demodulation reference signal of the first downlink data channel carried on all symbol groups before the end time of the end symbol of the second time-frequency resource is used to estimate the channels of all symbols of the second time-frequency resource.

22. A communication device, characterized in that: Comprising means for executing the method as claimed in any one of claims 1 to 21.

23. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a communication device, the communication device is caused to execute the method according to any one of claims 1 to 21.

24. A computer program product, characterized in that The method comprises computer instructions, which, when executed on a communication device, cause the communication device to execute the method according to any one of claims 1 to 21.

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