Wireless communication method and device

Abstract

The present application provides a method and apparatus for wireless communication, the method comprising: sending first indication information, the first indication information being used to indicate a first time domain resource combination, the first time domain resource combination comprising a first demodulation reference signal (DMRS) and a first physical downlink shared channel (PDSCH), the first DMRS being used to demodulate the first PDSCH, the time domain resource position of the first DMRS being before the time domain resource position of the first PDSCH; and sending the first DMRS at the time domain resource position of the first DMRS. By indicating the first time domain resource combination to a terminal device, the time domain resource positions of the demodulation reference signal and the physical downlink shared channel can be flexibly configured according to the service scenario of the terminal device, thereby improving the time domain resource utilization efficiency of the demodulation reference signal and the physical downlink shared channel.

Description

Technical Field

[0001] The present application relates to the field of communications, and more particularly, to a method and apparatus for wireless communications. Background Art

[0002] Reference signals (RS) are now widely used. In existing technologies, a transmitting device sends a demodulation reference signal (RS) along with data. The receiving device then performs channel estimation based on the RS and then demodulates the data based on the channel estimation results.

[0003] Taking the physical downlink shared channel (PDSCH) as an example, by indicating the relevant configuration parameters of the demodulation reference signal (DMRS) for demodulating the physical data channel, the receiving end can receive the DMRS at the corresponding resource location, thereby realizing the demodulation of the corresponding physical data channel.

[0004] In the new radio (NR) of the fifth-generation (5G) communication system, the design of reference signals needs to meet the business requirements of different application scenarios. For example, in ultra-reliability low latency communication (URLLC), both low latency and high reliability are required.

[0005] With the development of technology, while meeting business needs, higher requirements are placed on communication system resource overhead. Therefore, it is hoped to provide a technology that can meet business needs while taking into account the overhead of demodulation reference signals and improving the utilization efficiency of demodulation reference signals. Summary of the Invention

[0006] Embodiments of the present application relate to a method and apparatus for wireless communication, which can meet service requirements while taking into account the overhead of demodulation reference signals, thereby improving the utilization efficiency of demodulation reference signals.

[0007] In a first aspect, a method for wireless communication is provided, including: sending first indication information, the first indication information being used to indicate a first time domain resource combination, the first time domain resource combination including a first demodulation reference signal DMRS and a first physical downlink shared channel PDSCH, the first DMRS being used to demodulate the first PDSCH, the time domain resource position of the first DMRS being before the time domain resource position of the first PDSCH; and sending the first DMRS at the time domain resource position of the first DMRS.

[0008] According to the solution of the present application, when the network device is conducting wireless communication with the terminal device, the network device sends a first indication information to the terminal device, indicating the first time domain resource combination determined by the network device for the terminal device, the first time domain resource combination including the first demodulation reference signal DMRS and the first physical downlink shared channel PDSCH, the time domain resource starting position of the first DMRS is before the time domain resource starting position of the first PDSCH, and the demodulation reference signal is sent at the time domain resource position of the first DMRS. By indicating the first time domain resource combination to the terminal device, the time domain resource positions of the demodulation reference signal and the physical downlink shared channel can be flexibly configured according to the service scenario of the terminal device, thereby improving the time domain resource utilization efficiency of the demodulation reference signal and the physical downlink shared channel. In particular, in a system with multiple terminal devices, by configuring demodulation reference signals with the same time domain resource positions for different terminal devices through the network device, the resource overhead of the network device in sending the demodulation reference signal can be reduced, thereby improving the utilization efficiency of the demodulation reference signal.

[0009] Optionally, the starting position of the time domain resource position of the first DMRS is located before the starting position of the time domain resource of the first PDSCH.

[0010] Optionally, the time domain resource position of the first DMRS is located before the time domain resource start position of the first PDSCH.

[0011] It should be noted that the first DMRS may occupy at least one time domain resource unit, the at least one time domain resource unit may be continuous or discontinuous, and the time domain resource unit may be a symbol.

[0012] Exemplarily, when the time-domain resource position of the first DMRS is two discontinuous symbol positions, the first symbol position of the two symbol positions is before the symbol position occupied by the first PDSCH.

[0013] Optionally, the first PDSCH is sent at the time domain resource position of the first PDSCH.

[0014] In combination with the first aspect, in some possible implementations, the method further includes: determining time domain resource allocation configuration information, where the time domain resource allocation configuration information includes the first time domain resource combination.

[0015] Optionally, the time domain resource allocation configuration information may further include a second time domain resource combination, where the second time domain resource combination includes a third DMRS and a third PDSCH, and the third DMRS is located within the time domain resources of the third PDSCH.

[0016] With reference to the first aspect, in some possible implementations, the sequence initialization parameter of the first DMRS is a cell identifier.

[0017] With reference to the first aspect, in some possible implementations, when the first PDSCH carries initially transmitted data, the first DMRS is sent at the time domain resource location of the first DMRS.

[0018] In combination with the first aspect, in some possible implementations, the method further includes: sending first downlink control information DCI before the time domain resource starting position of the first DMRS, where the first DCI includes the first indication information.

[0019] In combination with the first aspect, in some possible implementations, the method further includes: sending a second PDSCH, the first DMRS is also used to demodulate the second PDSCH, and the time domain resource position of the second PDSCH is different from that of the first PDSCH.

[0020] According to the solution of the present application, a network device transmits physical downlink shared channels with different time domain resource locations to different terminal devices, and transmits a common demodulation reference signal to these multiple terminal devices. This can reduce the resource overhead of the network device in transmitting the demodulation reference signal and improve the utilization efficiency of the demodulation reference signal. That is, the network device configures demodulation reference signals with the same time domain resource location for different terminal devices.

[0021] Optionally, the time domain resource position of the second PDSCH may be before or after the time domain resource position of the first PDSCH.

[0022] Optionally, the frequency domain resource position of the second PDSCH may be the same as the time domain resource position of the first PDSCH.

[0023] In combination with the first aspect, in some possible implementations, the first time domain resource combination further includes a second DMRS, where the second DMRS is used to demodulate the first PDSCH, and the second DMRS is located within the time domain resources of the first PDSCH.

[0024] According to the solution of the present application, when the first time-domain resource combination includes a first DMRS and a second DMRS, the network device can meet different service scenarios by sending different DMRSs to the terminal device. For example, the network device can send the second DMRS coupled to the time-domain resource position of the first PDSCH to the terminal device, so that the terminal device can use the second DMRS to demodulate the first PDSCH, thereby improving the reliability of demodulation.

[0025] It should be noted that “the second DMRS is located within the time domain resource of the first PDSCH” can be understood as the time domain resource position of the first PDSCH includes the time domain resource position of the second DMRS.

[0026] Optionally, the time domain resource position of the second DMRS occupies the first symbol of the time domain resource position of the first PDSCH.

[0027] Optionally, the second DMRS occupies multiple continuous or discontinuous positions in the time domain resource position of the first PDSCH.

[0028] In combination with the first aspect, in some possible implementations, the method further includes: when the first PDSCH carries retransmission data, sending the second DMRS at the time domain resource position of the second DMRS.

[0029] In combination with the first aspect, in some possible implementations, the method further includes: sending a second DCI, the time domain and / or frequency domain resource position of the second DCI being located before the time domain and / or frequency domain resource position of the first PDSCH; and sending the second DMRS.

[0030] Optionally, the time domain resource position of the second DCI is located before the time domain resource position of the first PDSCH.

[0031] Optionally, the frequency domain resource position of the second DCI is located before the frequency domain resource position of the first PDSCH.

[0032] Optionally, the time domain and resource position of the second DCI are located before the time domain and frequency domain resource position of the first PDSCH.

[0033] In a second aspect, a method for wireless communication is provided, including: receiving first indication information, the first indication information being used to indicate a first time domain resource combination, the first time domain resource combination including a first demodulation reference signal DMRS and a first physical downlink shared channel PDSCH, the first DMRS being used to demodulate the first PDSCH, the time domain resource position of the first DMRS being before the time domain resource position of the first PDSCH; and receiving the first DMRS at the time domain resource position of the first DMRS.

[0034] In combination with the second aspect, in a possible implementation manner, the method further includes: determining time domain resource allocation configuration information, where the time domain resource allocation configuration information includes at least one of the first time domain resource combinations.

[0035] Optionally, the terminal device may determine the time domain resource allocation configuration information through second indication information sent by the network device. The second indication information may be a radio resource control layer RRC signaling.

[0036] With reference to the second aspect, in a possible implementation manner, the sequence initialization parameter of the first DMRS is a cell identifier.

[0037] In combination with the second aspect, in a possible implementation manner, when the first PDSCH carries initially transmitted data, the first DMRS is received at the time domain resource position of the first DMRS.

[0038] In combination with the second aspect, in a possible implementation manner, the method further includes: receiving first downlink control information DCI, where the first DCI includes the first indication information.

[0039] In combination with the second aspect, in a possible implementation manner, the first time domain resource combination further includes a second DMRS, where the second DMRS is used to demodulate the first PDSCH and is located within the time domain resources of the first PDSCH.

[0040] In combination with the second aspect, in a possible implementation manner, the method further includes: when the first PDSCH carries retransmission data, receiving the second DMRS at the time domain resource position of the second DMRS.

[0041] In combination with the second aspect, in a possible implementation, the method also includes: receiving a second DCI, the time domain and / or frequency domain resource position of the second DCI being located before the time domain and / or frequency domain resource position of the first PDSCH; and receiving the second DMRS.

[0042] It should be understood that the expansion, limitation, explanation and description of the relevant content in the above-mentioned first aspect also apply to the same content in the second aspect.

[0043] According to a third aspect, a wireless communication device is provided, comprising: a transceiver unit for sending first indication information, wherein the first indication information is used to indicate a first time domain resource combination, wherein the first time domain resource combination comprises a first demodulation reference signal DMRS and a first physical downlink shared channel PDSCH, wherein the first DMRS is used to demodulate the first PDSCH, and the time domain resource position of the first DMRS is before the time domain resource position of the first PDSCH; the transceiver unit is also used to send the first DMRS at the time domain resource position of the first DMRS.

[0044] In combination with the third aspect, in a possible implementation manner, the apparatus further includes: a processing unit, configured to determine time domain resource allocation configuration information, where the time domain resource allocation configuration information includes at least one of the first time domain resource combinations.

[0045] With reference to the third aspect, in a possible implementation, the sequence initialization parameter of the first DMRS is a cell identifier.

[0046] In combination with the third aspect, in a possible implementation manner, when the first PDSCH carries initially transmitted data, the transceiver unit is configured to send the first DMRS at a time domain resource location of the first DMRS.

[0047] In combination with the third aspect, in a possible implementation manner, the transceiver unit is further configured to send first downlink control information DCI before a time domain resource start position of the first DMRS, where the first DCI includes the first indication information.

[0048] In combination with the third aspect, in a possible implementation, the transceiver unit is further used to send a second PDSCH, the first DMRS is further used to demodulate the second PDSCH, and the time domain resource position of the second PDSCH is different from that of the first PDSCH.

[0049] In combination with the third aspect, in a possible implementation, the first time domain resource combination further includes a second DMRS, where the second DMRS is used to demodulate the first PDSCH, and the second DMRS is located within the time domain resources of the first PDSCH.

[0050] In combination with the third aspect, in a possible implementation, when the first PDSCH carries retransmission data, the transceiver unit is further configured to send the second DMRS at the time domain resource position of the second DMRS.

[0051] In combination with the third aspect, in one possible implementation, the transceiver unit is also used to send a second DCI, and the time domain and / or frequency domain resource position of the second DCI is located before the time domain and / or frequency domain resource position of the first PDSCH; the transceiver unit is also used to send the second DMRS.

[0052] In a fourth aspect, a wireless communication device is provided, including: a transceiver unit for receiving first indication information, the first indication information being used to indicate a first time domain resource combination, the first time domain resource combination including a first demodulation reference signal DMRS and a first physical downlink shared channel PDSCH, the first DMRS being used to demodulate the first PDSCH, the time domain resource position of the first DMRS being before the time domain resource position of the first PDSCH; the transceiver unit is also used to receive the first DMRS at the time domain resource position of the first DMRS.

[0053] In combination with the fourth aspect, in a possible implementation manner, the device further includes: a processing unit, configured to determine time domain resource allocation configuration information, where the time domain resource allocation configuration information includes at least one of the first time domain resource combinations.

[0054] With reference to the fourth aspect, in a possible implementation manner, the sequence initialization parameter of the first DMRS is a cell identifier.

[0055] In combination with the fourth aspect, in a possible implementation manner, when the first PDSCH carries initially transmitted data, the transceiver unit is further configured to receive the first DMRS at a time domain resource location of the first DMRS.

[0056] In combination with the fourth aspect, in a possible implementation manner, the transceiver unit is further used to receive first downlink control information DCI, where the first DCI includes the first indication information.

[0057] In combination with the fourth aspect, in a possible implementation, the first time domain resource combination further includes a second DMRS, where the second DMRS is used to demodulate the first PDSCH, and the second DMRS is located within the time domain resources of the first PDSCH.

[0058] In combination with the fourth aspect, in a possible implementation manner, when the first PDSCH carries retransmission data, the transceiver unit is further configured to receive the second DMRS at the time domain resource position of the second DMRS.

[0059] In combination with the fourth aspect, in one possible implementation, the transceiver unit is also used to receive a second DCI, the time domain and / or frequency domain resource position of the second DCI is located before the time domain and / or frequency domain resource position of the first PDSCH; and the transceiver unit is also used to receive the second DMRS.

[0060] In a fifth aspect, a wireless communication device is provided, comprising a processor, the processor being coupled to a memory, the memory being used to store computer programs or instructions, the processor being used to execute the computer programs or instructions in the memory, so that the method in the first aspect or any possible implementation of the first aspect is executed, or the method in the second aspect or any possible implementation of the second aspect is executed.

[0061] Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, and the processor is coupled to the communication interface. Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0062] In one implementation, the communication device is a terminal device. When the communication device is a terminal device, the communication interface may be a transceiver or an input / output interface. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input / output interface may be an input / output circuit.

[0063] In another implementation, the communication device is a chip or a chip system. When the communication device is a chip or a chip system, the communication interface may be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin, or related circuits on the chip or chip system. The processor may also be embodied as a processing circuit or a logic circuit.

[0064] In a sixth aspect, a wireless communication device is provided, comprising a processor coupled to a memory and configured to execute the method of the first aspect and possible implementations thereof or the second aspect and possible implementations thereof. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor coupled to the communication interface. Optionally, the communication device further comprises a communication interface, the processor coupled to the communication interface.

[0065] In one implementation, the communication device is a network device. When the communication device is a network device, the communication interface may be a transceiver or an input / output interface.

[0066] In another implementation, the communication device is a chip or a chip system. When the communication device is a chip or a chip system, the communication interface may be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin, or related circuits on the chip or chip system. The processor may also be embodied as a processing circuit or a logic circuit.

[0067] In the seventh aspect, a computer-readable storage medium is provided, characterized in that the computer-readable storage medium stores a computer program or instructions, which, when executed, causes the method in the first aspect or any possible implementation of the first aspect to be executed, or the method in the second aspect or any possible implementation of the second aspect to be executed.

[0068] In an eighth aspect, a communication system is provided, comprising the above-mentioned network device and terminal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 2 is a schematic diagram of a wireless communication system according to an embodiment of the present application.

[0070] Figure 2 It is a schematic interactive diagram of the demodulation reference signal transmission method of an embodiment of the present application.

[0071] Figure 3 This is a schematic diagram of an example of resource distribution in an embodiment of the present application.

[0072] Figure 4 This is a schematic diagram of another example of resource distribution in an embodiment of the present application.

[0073] Figure 5This is a schematic diagram of another example of resource distribution in an embodiment of the present application.

[0074] Figure 6 This is a schematic diagram of another example of resource distribution in an embodiment of the present application.

[0075] Figure 7 This is a schematic diagram of another example of resource distribution in an embodiment of the present application.

[0076] Figure 8 This is a schematic diagram of another example of resource distribution in an embodiment of the present application.

[0077] Figure 9 This is a schematic diagram of another example of resource distribution in an embodiment of the present application.

[0078] Figure 10 It is a schematic block diagram of a communication device according to an embodiment of the present application.

[0079] Figure 11 It is another schematic block diagram of a communication device according to an embodiment of the present application.

[0080] Figure 12 This is another schematic block diagram of the communication device according to an embodiment of the present application.

[0081] Figure 13 This is another schematic block diagram of the communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0082] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0083] As used in this specification, the terms "component," "module," "system," and the like are used to represent computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and / or a computer. By way of illustration, both an application running on a computing device and a computing device can be a component. One or more components can reside in a process and / or an execution thread, and a component can be located on a computer and / or distributed between two or more computers. In addition, these components can be executed from various computer-readable media having various data structures stored thereon. Components can communicate, for example, via local and / or remote processes based on signals having one or more data packets (e.g., data from two components interacting with another component on a local system, a distributed system, and / or a network, such as the Internet interacting with other systems via signals).

[0084] It should be understood that the embodiments of the present application can be applied to various communication systems, such as: long term evolution (LTE) system, advanced long term evolution (LTE-A) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), world-wide interoperability for microwave access (WiMAX) communication system, wireless local area networks (WLAN), wireless fidelity (WiFi), future fifth generation (5G) system or new radio (NR) or next generation communication system, etc., and the embodiments of the present application are not limited.

[0085] Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communications, but will also support, for example, device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), and vehicle-to-vehicle (V2V) communication.

[0086] The present application describes various embodiments in conjunction with network devices and terminal devices, wherein:

[0087] A terminal device may also be referred to as user equipment (UE), access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device. The terminal device may be a station (ST) in a WLAN, a mobile phone, a satellite phone, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a tablet computer (pad), a computer with wireless transceiver function, a wireless local loop (WLL) station, a personal digital assistant (PDA) device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical care, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, a terminal device in a 5G network, or a future-evolved public land mobile communication network (PLMN). The present invention relates to terminal devices in a fifth-generation communication (5G) network, a terminal device in a public land mobile network (PLMN), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, and a next-generation communication system, for example, a terminal device in a fifth-generation communication (5G) network or a terminal device in a future-evolved public land mobile network (PLMN). The embodiments of the present application do not limit the application scenarios.

[0088] As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices may also be called wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0089] The network device may be any device with wireless transceiver functions. The network device includes, but is not limited to, an evolved node B (eNB or eNodeB), a radio network controller (RNC), a node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (e.g., home evolved node B, or homenode B, HNB), a base band unit (BBU), an access point in a WLAN, an access point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (TP) or a transmission and reception point (TRP), etc. It may also be a gNB in ​​a 5G, such as NR, system, or a transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or a network node constituting a gNB or a transmission point, such as a base band unit (BBU), a distributed unit (DPU), or a 5G NR system. The term "mobile phone unit (DU)" refers to a device that performs base station functions in device-to-device (D2D), vehicle-to-everything (V2X), or machine-to-machine (M2M) communications, or an on-board device, wearable device, or a network device in a future 5G network or a network device in a future evolved PLMN network.

[0090] In addition, in an embodiment of the present application, the network device provides services for a cell, and the terminal device communicates with the network device through the transmission resources used by the cell (for example, frequency domain resources, or spectrum resources). The cell can be a cell corresponding to the network device (for example, a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. The small cells here may include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0091] In addition, multiple cells can operate simultaneously on the same frequency on a carrier in an LTE or 5G system. In certain special scenarios, the concepts of carrier and cell can be considered equivalent. For example, in a carrier aggregation (CA) scenario, when a secondary carrier is configured for a UE, both the carrier index of the secondary carrier and the cell identifier (cell ID) of the secondary cell operating on the secondary carrier are carried. In this case, the concepts of carrier and cell can be considered equivalent, for example, a UE accessing a carrier is equivalent to accessing a cell.

[0092] Figure 1 FIG. 1 shows a schematic diagram of a wireless communication system provided by an embodiment of the present application. Figure 1 As shown, the communication system 100 includes a network device 110, which is used to communicate with multiple terminal devices (such as terminal devices 120, 130, 140 and 150). Figure 1A schematic diagram of a wireless communication system is provided for illustrative purposes only. Specific components of the network device 110 are not shown in detail. For example, the network device 110 may additionally include a transmitter chain and a receiver chain. Those skilled in the art will appreciate that each of these may include multiple components related to signal transmission and reception (e.g., a processor, a modulator, a multiplexer, a demodulator, a demultiplexer, or an antenna, etc.). However, it will be appreciated that the network device 110 may communicate with any number of terminal devices, such as the terminal devices 120, 130, 140, and 150. The terminal devices 120, 130, 140, and 150 may be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and / or any other suitable devices for communicating on the wireless communication system 100. For another example, the network device 110 can be a base station in ultra reliable low latency communication (URLLC) in a factory scenario, and the terminal devices 120, 130, 140 and 150 can be user equipment UEs with tight arrangement and regular services in the URLLC service scenario.

[0093] also, Figure 1 Only the process of the network device 110 sending information or data to the terminal devices 120, 130, 140 and 150 (i.e., the downlink process) is shown. A person skilled in the art can understand that the wireless communication system also includes an uplink process of data, information, etc. (the terminal device sends data to the network device).

[0094] It will be appreciated that at a given time, network device 110, terminal devices 120, 130, 140, and 150 may be wireless communication transmitting devices and / or wireless communication receiving devices. When transmitting data, the wireless communication transmitting device may encode the data for transmission. Specifically, the wireless communication transmitting device may obtain (e.g., generate, receive from another communication device, or store in a memory, etc.) a certain number of data bits to be transmitted via a channel to the wireless communication receiving device. Such data bits may be contained in a transmission block (or multiple transmission blocks) of data, and the transmission block may be segmented to generate multiple code blocks.

[0095] also, Figure 1 This is just a simplified diagram for example. The network may also include other network devices. Figure 1 Not drawn in.

[0096] In a wireless communication system, the network device 110 communicates with a terminal device (such as the terminal device 120), and the network device sending data to the terminal device is generally called downlink transmission or downlink scheduling. For example, in the downlink scheduling process in the 5G NR system, the network device 110 sends a downlink control channel (physical downlink control channel, PDCCH), a downlink data shared channel (physical downlink shared channel, PDSCH), a demodulation reference signal (DMRS), etc. to the terminal device to complete downlink scheduling. It should be noted that downlink scheduling in the 5G NR system includes semi-static scheduling and dynamic scheduling. Among them, dynamic scheduling is suitable for scenarios where the service type and service triggering time are uncertain, and semi-static scheduling is suitable for scenarios where the user equipment has a small mobility and the service triggering time is known, such as some factory scenarios where the production line UE and service are relatively fixed. In semi-static scheduling, the network device 110 can send downlink control information (downlink control information, DCI) to the terminal device via PDCCH to indicate the resources allocated to the terminal device. The resources allocated to the terminal device within a certain period of time are fixed. When the transmission conditions change significantly, the network device sends DCI again to reallocate the resources of the terminal device. It is understood that the resource may refer to a time-frequency resource and / or a frequency domain resource, for example, the time-frequency resource may be a time slot resource, a time domain symbol, etc. It is understood that the time unit may be a time slot or a mini-time slot, and the description uses a time slot as an example for description.

[0097] When the network device 110 communicates with a terminal device (such as the terminal device 120), the network device 110 sends a PDSCH and a DMRS corresponding to the PDSCH to the terminal device 120, and the DMRS is used by the terminal device 120 to demodulate the PDSCH. One possible implementation is that the PDSCH sent by the network device 110 is tightly coupled with the DMRS, that is, there is at least one DMRS in one PDSCH. It can be seen that when performing downlink data scheduling, the network device needs to send a demodulation reference signal DMRS corresponding to the PDSCH so that the terminal device can demodulate the PDSCH sent by the network device. In the case of a large number of services or a large number of terminal devices, the network device needs to send the corresponding PDSCH and DMRS to the terminal device, which results in more demodulation reference signal transmissions in the communication system, increases the DMRS overhead in the semi-static scheduling process, and causes a waste of resources.

[0098] Based on the above problems, the present application provides a wireless communication method, which reduces the number of transmissions of demodulation reference signals, reduces DMRS overhead, and saves resources when a network device and a terminal device perform a downlink scheduling process.

[0099] It should be noted that, in the present application, A and / or B means that A exists alone, B exists alone, or A and B exist at the same time.

[0100] Figure 2 A schematic interactive diagram of a method 200 for transmitting a demodulation reference signal according to an embodiment of the present application is shown. Figure 2 The interaction between the network device 110 and the terminal device 120 is used as an example for introduction. For ease of introduction, the following embodiment uses the process of transmitting a demodulation reference signal (DMRS) between the terminal device #1 (an example of a terminal device, such as the terminal device 120) and the network device as an example for introduction. Figure 2 The illustrated transmission method 200 includes:

[0101] S210: The network device sends first indication information.

[0102] The network device 110 sends first indication information to the terminal device #1, where the first indication information is used to indicate a first time domain resource combination to the terminal device #1, where the first time domain resource combination includes a first demodulation reference signal DMRS and a first physical downlink shared channel PDSCH, where the first DMRS is used to demodulate the first PDSCH, and a time domain resource position of the first DMRS is before a time domain resource position of the first PDSCH;

[0103] It should be understood that network device 110 sends indication information #1 to terminal device #1, indicating the time-domain resource combination determined by network device 110. For example, the resource combination determined by network device 110 may be resource combination #1. In this way, after receiving indication information #1, terminal device #1 determines resource combination #1, thereby ensuring that the same resource combination is used for data transmission between network device 110 and terminal device #1.

[0104] Optionally, the first DMRS may be a group of DMRSs occupying multiple time domain symbols, or the first DMRS occupies one time domain symbol.

[0105] Optionally, the time domain resource position of the first DMRS may be before the time domain resource position of the first PDSCH, and the starting position of the time domain resource position of the first DMRS may be before the starting position of the time domain resource position of the first PDSCH. For example, the first DMRS occupies a symbol position on the time domain resource, and the symbol position is before the time domain resource position of the first PDSCH. For another example, the time domain resource position of the first DMRS is a plurality of time domain symbols, and at least one time domain symbol among the plurality of time domain symbols is located before the starting position of the time domain resource of the first PDSCH, such as the starting symbol among the plurality of symbols is located before the starting position of the time domain resource of the first PDSCH. For another example, the position of each time domain symbol occupied by the first DMRS is before the time domain resource position of the first PDSCH.

[0106] Optionally, before sending the first indication information to the terminal device #1, the network device 110 can determine the resource combination #1, which corresponds to the physical downlink channel PDSCH#A and the demodulation reference signal DMRS#A of the terminal device #1, and the time domain resource position of the DMRS#A is before the time domain resource position of the PDSCH#A.

[0107] As an example and not a limitation, the time domain resource position of the DMRS#A may be before the time domain resource position of the PDSCH#A as follows: Figure 3 shown. Figure 3 A schematic diagram showing possible resource distribution of demodulation reference signals and physical downlink shared channels in an embodiment of the present application is shown in FIG. Figure 3 As shown, in a time slot, the time domain resource position of DMRS#A is time domain symbol 2, and the time domain resource position of PDSCH#A is the positions of time domain symbols 5 and 6.

[0108] Optionally, the first time domain resource combination further includes a second DMRS, where the second DMRS is used to demodulate the first PDSCH and is located within the time domain resources of the first PDSCH.

[0109] Optionally, before sending the first indication information to the terminal device #1, the network device 110 may also determine a resource combination #2, where the resource combination #2 corresponds to the physical downlink shared channel PDSCH#B, the demodulation reference signal DMRS#B1 and DMRS#B2 of the terminal device, the time domain resource position of the DMRS#B1 being before the time domain resource position of the PDSCH#B, and the time domain resource position of the DMRS#B2 being within the time domain resource position of the PDSCH#B.

[0110] It should be noted that the time domain resource position of DMRS#B2 being located within the time domain resource position of PDSCH#B can be understood as the time domain resource position of PDSCH#B including the time domain resource position of DMRS#B2. For example, DMRS#B2 occupies one time domain symbol, and this symbol position can be the starting symbol position of PDSCH#B2. For another example, DMRS#B2 can also occupy multiple time domain symbols, and the time domain resource position of DMRS#B2 is located within the time domain resource position of PDSCH#B. It should be understood that in this case, DMRS#B2 and PDSCH#B are coupled.

[0111] As an example and not a limitation, the time domain resource positions of the DMRS#B1, DMRS#B2 and the PDSCH#B may be as follows: Figure 4 shown. Figure 4 FIG. 1 is a schematic diagram showing another possible resource distribution of a demodulation reference signal and a physical downlink shared channel in an embodiment of the present application. Figure 4 As shown, in a time slot, the time domain resource position of DMRS#B1 is time domain symbol 2, the time domain resource position of PDSCH#B is time domain symbols 7 and 8, and the time domain resource position of DMRS#B2 is the position of time domain symbol 7 in the time slot. Figure 4 As shown, DMRS#B2 occupies the starting position of the time domain resource position of PDSCH#B.

[0112] It should be understood that Figure 3 and Figure 4 The distribution of time domain resources is given only as an example, and the scope of protection of this application is not limited thereto. Figure 3 and Figure 4 The resource distribution in the time domain is only given as an example, and does not limit the distribution of frequency domain resources.

[0113] Optionally, the network device 110 may send downlink control information DCI#1 to the terminal device #1 before the time domain resource position of the DMRS#A, where the DCI#1 includes the indication information #1.

[0114] Optionally, the network device 110 may send downlink control information DCI#1 to the terminal device #1 before the time domain resource position of the DMRS #B1, where the DCI#1 includes the indication information #1.

[0115] As an example and not a limitation, the time domain resource location of DCI#1 can be as follows: Figure 5 shown. Figure 5 A schematic diagram showing another resource distribution embodiment of the present application is shown.

[0116] It should be noted that in the embodiments of the present application, the time domain resources may be time domain symbols, or time domain resources used in future communication processes, and the present application is not limited thereto.

[0117] Optionally, before the network device 110 determines the first resource combination, the transmission method 200 further includes:

[0118] S220: Determine time domain resource allocation configuration information, where the time domain resource allocation configuration information includes the first time domain resource combination.

[0119] The time domain resource allocation configuration information includes the DMRS mapping type and the PDSCH start and length indicator value (SLIV). It should be understood that the DMRS mapping type can indicate the time domain resource location of the DMRS, and the PDSCH SLIV is used to jointly indicate the start position S and length L of the physical downlink shared channel. In this application, for ease of description, the start position S and length L of the physical downlink shared channel (PDSCH) are referred to as the time domain resource location of the PDSCH.

[0120] Optionally, the network device may determine the time domain resource allocation configuration information according to protocol configuration.

[0121] Optionally, the time domain resource allocation configuration information may include a first time domain resource combination. For example, the time domain resource allocation configuration information includes resource combination #A (i.e., an example of the first time domain resource combination). For another example, the time domain resource allocation configuration information may also include resource combination #B (i.e., another example of the first time domain resource combination). It should be noted that resource combination #A corresponds to the first DMRS and the first PDSCH, and resource combination #B corresponds to the first DMRS, the second DMRS, and the first PDSCH. For example, resource combination #A corresponds to DMRS#A and PDSCH#A, and resource combination #B corresponds to DMRS#B1, DMRS#B2, and PDSCH#B.

[0122] Optionally, the time domain resource allocation configuration information may include at least one first time domain resource combination. For example, the time domain resource allocation configuration information includes multiple resource combinations #A (which may be referred to as "first candidate combinations"), or multiple resource combinations #B (which may be referred to as "second candidate combinations"), or multiple resource combinations #A and multiple resource combinations #B.

[0123] It should be noted that the time domain resource allocation configuration information may include at least one first time domain resource combination, which can be understood as the time domain resource allocation configuration information including at least one of a first candidate combination and a second candidate combination. The first candidate combination may include multiple resource combinations #A, and the second candidate combination may include multiple resource combinations #B. For example, when the first time domain resource combination includes a first DMRS and a first PDSCH, the first time domain resource combination corresponds to the first candidate combination. For another example, when the first time domain resource combination includes a first DMRS, a second DMRS, and a first PDSCH, the first time domain resource combination corresponds to the second candidate combination.

[0124] For example, Table 1 shows a possible form of time domain resource allocation configuration information. The time domain resource allocation configuration information includes a first candidate combination and a second candidate combination. The first candidate combination corresponds to row indexes 1 to i, and the second candidate combination corresponds to row numbers i+1, i+2, ...

[0125] Table 1

[0126] Row Index Mapping Type S L 1 Type C 2 2 2 Type C 4 2 …… …… …… …… i+1 Type C or Type B 2 2 i+2 Type C or Type B 4 2 …… …… …… ……

[0127] In Table 1, each index among indexes 1 to i corresponds to a resource combination #A, and each index among indexes i+1, i+2, ... corresponds to a resource combination #B.

[0128] The mapping types in Table 1 correspond to the time domain resource locations of the DMRS. For example, the mapping type corresponding to the first candidate combination is Type C, and the mapping type corresponding to the second candidate combination is Type C or Type B. The starting position S and length L are used to indicate the time domain resource location occupied by the transmitted physical downlink shared channel PDSCH. It should be understood that S and L can be indicated using the start and length indicators.

[0129] For another example, Table 2 shows another possible form of time domain resource allocation configuration information. The time domain resource allocation configuration information includes a first candidate combination. The first candidate combination includes multiple first time domain resource combinations. The first candidate combination corresponds to row indexes 1 to j.

[0130] Table 2

[0131] Row Index Mapping Type S L 1 Type C 2 2 2 Type C 4 2 …… …… …… …… j+1 Type A 2 12 j+2 Type B 12 2 …… …… …… ……

[0132] For another example, the time domain resource allocation configuration information further includes a third candidate combination, that is, the time domain resource combination corresponding to row indexes j+1, j+2, ... in Table 2. The third candidate combination includes multiple second time domain resource combinations, the second time domain resource combination includes a third DMRS and a third PDSCH, and the third DMRS is located in the time domain resource of the third PDSCH.

[0133] It should be understood that the above examples are merely exemplary and the present application is not limited thereto.

[0134] Table 3 shows the position of the demodulation reference signal DMRS in the time domain resources. Under mapping type Type C, the reference point l of the DMRS in the time domain is the beginning of the time slot, and the position l0 of the first DMRS symbol in the time domain is symbol 2 or symbol 3 starting from 1, and when the high-level parameter dmrs-TypeA-Position is 3, the position of symbol 3 is selected. The PDSCH time domain resource mapping mode is mapping type Type B. The reference point l of the DMRS in the time domain is the beginning of the scheduled PDSCH resources, and the position l0 of the first DMRS symbol in the time domain is symbol 0 starting from 1. Under mapping type Type A, the reference point l of the DMRS in the time domain is the beginning of the time slot, and the position l0 of the first DMRS symbol in the time domain is symbol 2 or symbol 3 starting from 1, and when the high-level parameter dmrs-TypeA-Position is 3, the position of symbol 3 is selected. Under mapping type Type C, the time domain resource position of the DMRS can also be other positions, which are not limited in this application.

[0135] Table 3

[0136]

[0137] Optionally, the at least two candidate combinations indicated by the network device to the terminal device #1 through dedicated signaling include candidate combination #A (i.e., the first candidate combination) and candidate combination #B (i.e., the second candidate combination). Resource combination #A (an example of candidate combination #A) can be used to indicate the time domain transmission position of the demodulation reference signal DMRS#A and the physical downlink shared channel PDSCH#A, and resource combination #B (an example of candidate combination #B) is used to indicate the time domain transmission position of the demodulation reference signals DMRS#B1 and DMRS#B2 and PDSCH#B, wherein the demodulation reference signal DMRS#A is used by the receiving end (i.e., terminal device #1) to perform channel estimation and for demodulation of the downlink shared physical channel (i.e., PDSCH#A), and DMRS#B1 and DMRS#B2 are used by the receiving end (i.e., terminal device #1) to perform channel estimation and for demodulation of the downlink shared physical channel (i.e., PDSCH#B).

[0138] Optionally, the time domain resource position of the demodulation reference signal DMRS#A corresponding to resource combination #A is before the starting position S of the time domain resource position of the physical downlink shared channel PDSCH#A. For example, the position of DMRS#A in the time domain resource can be symbol position 2 or 3 of a time slot, and the starting position S of the time domain resource position of the physical downlink shared channel PDSCH#A can be {4, 5, 6, ...} and the length L can be {2, 4, 7}. It should be understood that the time domain resource positions of the demodulation reference signal and the physical downlink shared channel listed above are only exemplary and the present application is not limited thereto. For example, the time domain resource position of DMRS#A can be symbol 1 or 4 of a symbol, and the length L of the PDSCH#A can also be 3.

[0139] Optionally, the time domain transmission position of DMRS#A is before PDSCH#A. For example, Figure 3 The figure shows the position of DMRS#A in the time domain symbol 2, and PDSCH#A occupies two symbol bits 5 and 6 in the time slot. Figure 6 FIG shows another possible relative position of the demodulation reference signal and the physical downlink shared channel in an embodiment of the present application. Figure 6 The position of DMRS#A in time domain symbol 3 is shown, and PDSCH#A occupies symbol positions 6, 7, and 8 in the time slot. It should be understood that the above example is only an illustrative example of the relative position relationship between DMRS#A and PDSCH#A, and the present application is not limited thereto. Candidate combination #A may include other relative position relationships between DMRS#A and PDSCH#A.

[0140] Optionally, the time domain resource position of the first demodulation reference signal DMRS#B1 corresponding to resource combination #B is before the starting position S of the time domain resource position of the physical downlink shared channel PDSCH#B. For example, the position of DMRS#B1 in the time domain resource is symbol position 2 or 3 of a time slot, and the position of the second demodulation reference signal DMRS#B2 in the time domain resource is the starting symbol position of the physical downlink shared channel PDSCH#B. The starting position S of the time domain resource position of the physical downlink shared channel PDSCH#B can be {5, 6…} and the length L can be {2, 4, 7}. It should be understood that the time domain resource positions of the demodulation reference signal and the physical downlink shared channel listed above are only exemplary descriptions, and the present application is not limited thereto. For example, the length L of the PDSCH#B can also be 3. For another example, the time domain resource position of DMRS#B1 can also be located at time domain symbol 4 in the time slot.

[0141] Optionally, the time domain transmission position of DMRS#B1 is before PDSCH#B. The relative position of the demodulation reference signal and the physical downlink shared channel can be as follows: Figure 4 shown. Figure 4DMRS#B1 is at symbol 2 in the time domain, PDSCH#B occupies symbol bits 5 and 6 in the time slot, and DMRS#B2 is at the first symbol of the time domain resource position occupied by PDSCH#B. Figure 4 The relative position relationship between DMRS#B1, DMRS#B2 and PDSCH#B shown is only an example, and the present application is not limited thereto. The candidate combination #B may include other relative position relationships between DMRS#B1, DMRS#B2 and PDSCH#B.

[0142] It should be noted that the above examples of the positions of DMRS and PDSCH are only for illustrative description and do not limit the embodiments of the present application. For example, the time domain symbols in the embodiments of the present application can also carry DCI.

[0143] Optionally, the time domain resource allocation configuration information may further include a third candidate combination. It should be noted that the third candidate combination includes multiple second time domain resource combinations, the second time domain resource combination includes a third DMRS and a third PDSCH, and the third DMRS is located in the time domain resources of the third PDSCH.

[0144] Specifically, network device 110 indicates to terminal device #1 through dedicated signaling that the time domain resource allocation configuration information also includes a third candidate combination, and the third candidate combination includes resource combination #C and / or resource combination #D. For example, the DMRS mapping type corresponding to resource combination #C may be Type B, and the DMRS mapping type corresponding to resource combination #D may be Type A.

[0145] For example, Table 4 shows a possible form of candidate combinations of time-domain resource allocation configuration information. The third candidate combination corresponds to row indices j+1, ..., k+1, .... Specifically, each row in row indices k+1, k+2, ... corresponds to a resource combination #C in the third candidate combination, and each row in row indices j+1-k corresponds to a resource combination #D in the third candidate combination.

[0146] Table 4

[0147] Row Index Mapping Type S L 1 Type C 2 2 2 Type C 4 2 …… …… …… …… i+1 Type C or Type B 2 2 i+2 Type C or Type B 4 2 …… …… …… …… j+1 Type A 2 12 …… …… …… …… k+1 Type B 12 2 …… …… …… ……

[0148] Optionally, terminal device #1 determines allocation configuration information of time domain resources, wherein the time domain resource allocation configuration information includes at least one of a first candidate combination and a second candidate combination.

[0149] Optionally, the time domain resource allocation configuration information determined by terminal device #1 may be indicated by the network device through dedicated signaling. For example, the network device 110 may inform the UE of the candidate combination determined in the time domain resource allocation configuration information through radio resource control (RRC) signaling.

[0150] It should be noted that the time domain resource allocation configuration information determined by the terminal device corresponds to the network device. Here, in order to avoid redundancy, a detailed description of the time domain resource allocation configuration information is omitted.

[0151] S230. The terminal device determines a first resource combination according to the first indication information.

[0152] Terminal device #1 receives the first indication information sent by the network device, and determines the first time domain resource combination based on the first indication information. The first time domain resource combination includes a first demodulation reference signal DMRS and a first physical downlink shared channel PDSCH. The first DMRS is used to demodulate the first PDSCH, and the time domain resource position of the first DMRS is before the time domain resource position of the first PDSCH.

[0153] It should be understood that the first resource combination determined by terminal device #1 is consistent with that of network device 110. For example, the first resource combination of terminal device #1 is determined based on the first indication information sent by the network device. As an example and not a limitation, the first time-domain resource combination determined by terminal device #1 and network device 110 is resource combination #A or resource combination #B. To avoid redundancy, a detailed description thereof is omitted here. The first resource combination determined by terminal device #1 can be seen in the resource combination form determined by network device 110 described above.

[0154] Optionally, the terminal device #1 determines the first resource combination according to the first indication information, and the terminal device #1 determines the first time domain resource combination from the candidate combination, wherein the candidate combination includes at least one of the first candidate combination and the second candidate combination, the first candidate combination corresponds to the first DMRS, and the second candidate combination corresponds to the first DMRS and the second DMRS.

[0155] Optionally, terminal device #1 receives indication information #1 sent by network device 110 and determines a resource combination based on indication information #1. Specifically, when terminal device #1 receives DCI #1 sent by network device 110 on the time domain resource, it determines the resource combination indicated by network device 110 based on indication information #1 in DCI #1. For example, the resource combination may be resource combination #A.

[0156] Optionally, the terminal device receives first downlink control information DCI before the time domain resource position of the first DMRS, and the first DCI includes the first indication information. For example, terminal device #1 receives downlink control information DCI #1 sent by network device 110 before the time domain resource position of DMRS #A, and the DCI #1 includes the indication information #1.

[0157] For another example, the network device 110 sends downlink control information DCI#1 to the terminal device #1 before the time domain resource position of DMRS#B1, and the DCI#1 includes the indication information #1.

[0158] S240: The network device sends the first DMRS at the time domain resource position of the first DMRS.

[0159] Optionally, the network device 110 sends the first PDSCH at the time domain resource position of the first PDSCH according to the first time domain resource combination.

[0160] Optionally, the network device 110 sends the PDSCH#A and DMRS#A according to the resource combination #A.

[0161] Optionally, the PDSCH#B and the DMRS#B1 are sent according to resource combination #B.

[0162] Optionally, the PDSCH#B and the DMRS#B2 are sent according to resource combination #B.

[0163] Optionally, the PDSCH#B, the DMRS#B1 and the DMRS#B2 are sent according to resource combination #B.

[0164] It should be understood that in the case of resource combination #B, the network device 110 can make a judgment and accordingly choose to send DMRS#B1 or DMRS#B2 or DMRS#B1 and DMRS#B2.

[0165] It should also be understood that in the embodiments of the present application, as an example and not a limitation, the judgment made by the network device is, for example, to determine whether the service has changed, or to determine whether using DMRS#B1 as the reference signal for demodulating PDSCH#B is optimal, or to determine whether the data service corresponding to PDSCH#B needs to be retransmitted.

[0166] Optionally, the network device sends the first DMRS at a time domain resource position of the first DMRS, and sends the first PDSCH at a time domain resource position of the first PDSCH.

[0167] For example, the resource combination #A determined by the network device is the combination with row index 2 in Table 1. The network device sends DMRS #A on time domain symbol 2 and sends PDSCH #A on time domain symbols 4 and 5. Accordingly, terminal device #1 receives the DMRS #A and PDSCH #A according to the determined resource combination #A.

[0168] For another example, resource combination #B determined by the network device is the combination with row index i+2 in Table 1. The network device transmits DMRS#B1 on time domain symbol 2, and may also transmit DMRS#B2 on time domain symbol 4, and transmit PDSCH#B on time domain symbols 4 and 5. Accordingly, terminal device #1 receives DMRS#B1 on time domain symbol 2 and PDSCH#B on time domain symbols 4 and 5, or terminal device #1 receives DMRS#B1 on time domain symbol 2, then receives DMRS#B2 on time domain symbol 4 and PDSCH#B on time domain symbol 5. Receiving DMRS#B2 on time domain symbol 4 and PDSCH#B on time domain symbol 5 by terminal device #1 can be understood as the network device transmitting PDSCH#B on symbols 4 and 5 of the time slot, with DMRS#B2 occupying the first symbol position of PDSCH#B (i.e., symbol 4), and terminal device #1 receiving PDSCH#B and DMRS#B2 at the corresponding time domain resource positions.

[0169] It should be understood that the above is only an illustrative example and does not limit the embodiments of the present application. Resource combination #A may also correspond to other row indexes in Table 1. It should also be understood that resource combination #A may also correspond to other time domain resource allocation configuration information, such as row index 1 in Table 2.

[0170] Optionally, the demodulation reference signal transmission method 200 may further include:

[0171] S241. The network device sends a second DCI to the terminal device.

[0172] Accordingly, terminal device #1 receives the second DCI sent by network device 110.

[0173] It should be understood that in the case of resource combination #B, the network device 110 can make a judgment and choose to send DMRS #B2 accordingly.

[0174] As an example and not a limitation, the network device 110 can determine whether the time domain resources allocated to the terminal device #1 have changed. For example, the judgment made by the network device can be to determine whether the service has changed, to determine whether using PDSCH#B1 as the reference signal for demodulating PDSCH#B is optimal, or to determine whether the data service corresponding to PDSCH#B needs to be retransmitted.

[0175] Optionally, the network device 110 sends DCI#2 to the terminal device #1 so that when the terminal device #1 receives the DCI#2, it receives the DMRS#B2 at the time domain resource position of the DMRS#B2.

[0176] Optionally, the network device 110 determines that the service of the terminal device #1 has not changed and does not send DCI #2.

[0177] Optionally, the network device 110 determines that the terminal device #1 needs to receive the retransmission data service, and sends the DCI #2 to the terminal device #1, so that after the terminal device #1 receives the DCI #2, it receives the DMRS #B2 at the time domain resource position of DMRS #B2.

[0178] Optionally, the DCI#2 includes indication information #2, so that when the terminal device #1 receives the DCI#2, it determines to receive the DMRS#B2 at the time domain resource location of the DMRS#B2 according to the indication information #2. Optionally, the indication information #2 can be carried by a bit field in the DCI#2.

[0179] Optionally, the network device 110 determines that the terminal device #1 receives the initial data service and does not send DCI #2.

[0180] Optionally, network device 110 sends DCI #2 to terminal device #1, where DCI #2 is used to indicate a second DMRS and a second PDSCH, where the resource location of the second PDSCH is different from the resource location of the first PDSCH. The resource location includes at least one of a time domain resource location and a frequency domain resource location. For example, DCI #2 may indicate that terminal device #1 receives the second PDSCH at a resource location different from the resource location of PDSCH #B.

[0181] Optionally, the second PDSCH may be located at the same time domain resource position as PDSCH#B but at a different frequency domain resource position. For example, the second PDSCH may occupy the same time domain symbol as PDSCH#B in the time domain, and the frequency domain position of the second PDSCH may be adjacent to the frequency domain position of PDSCH#B in the frequency domain, for example, the second PDSCH and PDSCH#B occupy adjacent resource blocks (RBs).

[0182] For another example, the second PDSCH may be located at a position different from that of PDSCH#B in terms of time domain resources and frequency domain resources.

[0183] Optionally, when terminal device #1 receives the DCI#2, it can receive the PDSCH at the position of the second PDSCH indicated by the DCI#2, and receive the DMRS#B at the time domain resource position of DMRS#B (i.e., an example of the second DMRS).

[0184] It should be understood that the above examples are merely illustrative and do not constitute a limitation to this application.

[0185] S250: The terminal device receives the first DMRS at the time domain resource position of the first DMRS.

[0186] Optionally, terminal device #1 receives the PDSCH#A and DMRS#A according to resource combination #A. Specifically, terminal device #1 receives the DMRS#A at the time domain resource position of the DMRS#A and receives the PDSCH#A at the time domain resource position of the PDSCH#A.

[0187] Optionally, terminal device #1 receives the PDSCH#B and the DMRS#B1 according to resource combination #B. Specifically, terminal device #1 receives the DMRS#B1 at the time domain resource position of the DMRS#B1 and receives the PDSCH#B at the time domain resource position of the PDSCH#B.

[0188] Optionally, terminal device #1 receives the PDSCH#B and the DMRS#B2 according to resource combination #B. Specifically, terminal device #1 receives the DMRS#B2 at the time domain resource position of the DMRS#B2 and receives the PDSCH#B at the time domain resource position of the PDSCH#B.

[0189] It should be understood that terminal device #1 can receive the DMRS#B2 according to signaling or preset conditions, and the signaling or preset conditions are the judgment conditions for terminal device #1 to determine whether to receive the DMRS#B2 at the time domain resource position of the DMRS#B2. For example, the preset condition can be that the network device 110 sends an indication signaling (such as downlink control information DCI) to the terminal device #1, and the terminal device receives the DCI to determine that it needs to receive the DMRS at the time domain resource position of the DMRS#B2. For another example, the network device 110 can directly instruct the terminal device #1 to receive the DMRS at the time domain resource position of the DMRS#B2 through high-layer signaling.

[0190] Optionally, terminal device #1 may receive DMRS#B2 at the time domain resource position of DMRS#B2 according to a preset condition. The preset condition may be that network device 110 sends indication signaling (such as DCI#2) to terminal device #1. Specifically, terminal device #1 receives DCI#2 between the time domain resource position of DMRS#B1 and the time domain resource position of PDSCH#B, and determines to receive DMRS#B2 at the time domain resource position of DMRS#B2 according to DCI#2, and receives DMRS#B2 at this position.

[0191] It should be understood that terminal device #1 receives DMRS#B1 at the time domain resource position of DMRS#B1 and can use DMRS#B1 to demodulate PDSCH#B. When terminal device #1 receives DCI#2 between the time domain resource position of DMRS#B1 and the time domain resource position of PDSCH#B, terminal device #1 can also receive DMRS#B2 and use DMRS#B2 to demodulate PDSCH#B.

[0192] Optionally, terminal device #1 may also determine whether to receive DMRS#B2 based on the data service type of PDSCH#B. Specifically, terminal device #1 may determine whether to receive an initial data service or a retransmission data service at the time domain resource location of PDSCH#B. If retransmission data is transmitted at the time domain resource location of PDSCH#B, terminal device #1 may receive DMRS#B2 at the time domain resource location of DMRS#B2 and use DMRS#B2 to demodulate PDSCH#B.

[0193] It should be noted that in the above optional implementation method, terminal device #1 needs to receive DMRS#B1 and use DMRS#B1 to demodulate the PDSCH#B in the case of initial data transmission services, and receive DMRS#B2 and use DMRS#B2 to demodulate the PDSCH#B in the case of retransmission data services.

[0194] Optionally, after receiving DCI#2, terminal device #1 receives DMRS#2 at the time domain resource position of DMRS#B2.

[0195] It should be understood that after receiving DCI#3, terminal device #1 determines to receive DMRS#2. This can be done by determining that data retransmission occurs based on the retransmission data service indication information contained in DCI#2, and receiving DMRS#B2 based on the determination result (i.e., data retransmission occurs).

[0196] Terminal device #1 may determine to receive DMRS #B2 based on a bit field in DCI #2. This bit indicates that the data service carried by the scheduled PDSCH is a retransmission data service.

[0197] It should also be understood that the above are merely illustrative examples and do not limit the embodiments of the present application. Any signaling or preset conditions that can enable terminal device #1 to complete the selection of the corresponding DMRS function fall within the scope of protection of this application.

[0198] It should be noted that Figure 2 The steps or operations of the information processing method are shown, but these steps or operations are only examples. The embodiment of the present application can also perform other operations or Figure 2 Variations of the various operations in .

[0199] Optionally, as an example but not a limitation, the sequence used by the demodulation reference signal DMRS in the embodiment of the present application may include a pseudo-noise (PN) sequence.

[0200] Optionally, in the embodiment of the present application, the sequence r(n) of the demodulation reference signal DMRS can be calculated using the following formula:

[0201]

[0202]

[0203] Here, r(n) represents the nth sequence element on the lth symbol in the time slot, n represents the position of the DMRS in the frequency domain, and the form presented by r(n) is the complex form obtained by modulating the PN sequence.

[0204] Among them, the initialization sequence c init The sequence used to determine the demodulation reference signal on a symbol, c is a pseudo-random sequence (PN sequence), which can be generated by a PN sequence generator (for example, a Gold sequence generator) according to the initialization sequence c init generate.

[0205] in, is the number of symbols in a time slot, is the number of time slots in a frame, l is the number of OFDM symbols in a time slot, is a constant fixed to 0 or 1, and λ is the code division multiplexing (CDM) group number.

[0206] The identifier of the demodulation reference signal can be the cell identifier N ID , or it can be a high-level configuration identifier. For example, for and When , they are given by the higher-layer parameters scamblingID0 and scramblingID1 in the DMRS-DownlinkConfig IE.

[0207] Optionally, the demodulation reference signal DMRS sent by the network device is DMRS#A in candidate combination #A or DMRS#B1 in candidate combination #B. Cell ID N ID .

[0208] Optionally, the DMRS sent by the network device is a demodulation reference signal DMRS#B2 in the candidate combination #B. Identifies the high-level configuration.

[0209] Optionally, in the embodiment of the present application, the symbol may be an orthogonal frequency division multiplexing (OFDM) symbol, or may be a symbol defined in a future protocol for representing a time unit, which is not particularly limited in the embodiment of the present application.

[0210] Figure 7 A schematic diagram showing another example of resource distribution in an embodiment of the present application. Figure 7 An introduction is made using a time slot in the time domain and a resource block (RB) in the frequency domain. The RB includes 12 subcarriers in the frequency domain.

[0211] like Figure 7 As shown, the network device sends a demodulation reference signal DMRS and a physical downlink shared channel PDSCH to terminal devices #1 to #6. Optionally, the resource distribution can be applied as shown in FIG. Figure 1 The system shown can be used, for example, for ultra-reliable low-latency communication (URLLC) services in factory scenarios. In factory scenarios, UE locations and service arrival times on the same production line are relatively fixed and tightly packed, enabling the use of mini-slot-based semi-persistent scheduling to reduce DCI overhead.

[0212] Optionally, the scheduling method of terminal devices #1 to #6 is semi-static scheduling based on mini-slots. Figure 7 As shown, time domain symbols 0 and 1 are downlink control channels, carrying the activation DCI of each terminal device in semi-static scheduling.

[0213] Optionally, as an example but not limitation, DMRS#A with a length of 1 symbol is sent on time domain symbol 2 and frequency domain subcarriers 1, 4, 7 and 10.

[0214] Optionally, the resource combination #1 determined by the network device for the terminal device #1 is an example of the candidate combination #A, and accordingly, candidate combinations are determined for the terminal devices #2 to #6 in the candidate combination #A. Figure 7 As shown, the network device transmits DMRS#A corresponding to UE2 to UE6 at symbol 2, and correspondingly transmits UE2 PDSCH#A on symbols 4 and 5, UE3 PDSCH#A on symbols 6 and 7, UE4 PDSCH#A on symbols 8 and 9, UE5 PDSCH#A on symbols 10 and 11, and UE6 PDSCH#A on symbols 12 and 13. The network device transmits DMRS and PDSCH according to the determined resource combination #1. Correspondingly, UE2 to UE6 receive DMRS and PDSCH at the time domain resource locations according to resource combination #1 indicated by the network device.

[0215] According to the above method of transmitting the demodulation reference signal DMRS, the physical downlink shared channels of multiple terminal devices in one time slot can share one DMRS, that is, the PDSCH#A of UE2 to UE6 shares the DMRS#A on the time domain symbol 2, thereby reducing the DMRS overhead.

[0216] Figure 8 A schematic diagram showing another example of resource distribution according to an embodiment of the present application. Figure 8 The following is introduced with a time slot in the time domain and a resource block (RB) in the frequency domain. The RB includes 12 subcarriers in the frequency domain.

[0217] like Figure 8 The resource distribution diagram shown can be applied to Figure 1 In the system shown, the candidate combinations determined by the network device for multiple UEs are multiple candidate combinations #B. For example, the resource combination #1 determined by the network device for terminal device #1 is one of the candidate combinations #B, and accordingly, corresponding candidate combinations are determined for terminal devices #2 to #6 in candidate combination #B. Figure 8As shown, the network device can send DMRS#B1 common to UE1 for UE2 to UE6 on symbol 2, and send UE2 PDSCH#B on symbols 4 and 5, UE3 PDSCH#B on symbols 6 and 7, UE4 PDSCH#B on symbols 8 and 9, UE5 PDSCH#B on symbols 10 and 11, and UE6 PDSCH#B on symbols 12 and 13. DMRS#B1 is used to demodulate UE2 PDSCH#B, UE3 PDSCH#B, UE4 PDSCH#B, UE5 PDSCH#B and UE6 PDSCH#B. For another example, the network device can send the DMRS#B2 corresponding to each terminal device in the first symbol position occupied by the physical downlink shared channel. The DMRS#B2 corresponding to UE4 can be sent on the first symbol of UE4 PDSCH#B (i.e., symbol 8), the DMRS#B2 corresponding to UE5 can be sent on the first symbol of UE5 PDSCH#B (i.e., symbol 10), and the DMRS#B2 corresponding to UE6 can be sent on the first symbol of UE6 PDSCH#B (i.e., symbol 12). In this case, the DMRS#B2 corresponding to UEs 4 to 6 is used to demodulate the PDSCH#B corresponding to each UE, instead of using DMRS#B1 for demodulation.

[0218] Optionally, the scheduling method of terminal devices #1 to #6 is semi-static scheduling based on mini-slots. Figure 8 As shown, time domain symbols 0 and 1 are downlink control channels, carrying the activation DCI of each terminal device in semi-static scheduling.

[0219] Optionally, the activation DCI is used to indicate that the candidate combinations configured by the network device for the multiple terminal devices (UE1 to UE6) are six examples in candidate combination #B. Accordingly, the activation DCI is also used to indicate that the multiple terminal devices use a common DMRS #B1 (i.e., the DMRS on symbol 2) to demodulate the physical downlink shared channel.

[0220] Optionally, the network device sends DCI indication information to the terminal device according to the received condition information, where the DCI indication information is used to instruct the terminal device to use DMRS#B2 as a demodulation reference signal for PDSCH#B. Figure 8 In the example, the network device sends indication information DCI#0 to the terminal devices UE4, UE5 and UE6, and the indication information DCI#0 instructs UE4, UE5 and UE6 to use their corresponding DMRS#B2 as the demodulation reference signal of their PDSCH#B. It should be understood that the network device can Figure 8 The DCI is sent on an RB adjacent to the RB shown in .

[0221] Optionally, the condition information may be information indicating that the current service has changed or information indicating that using DMRS#B1 as the demodulation reference signal of PDSCH#B at the current moment is not an optimal method.

[0222] Figure 9 A schematic diagram showing another example of resource distribution according to an embodiment of the present application. Figure 9 The introduction is made using n+1 time slots in the time domain and one resource block in the frequency domain. The RB includes 12 subcarriers in the frequency domain.

[0223] like Figure 9 The resource distribution diagram shown can be applied to Figure 1 In the system shown in FIG, the candidate combinations determined by the network device for the multiple UEs are multiple candidate combinations #B. For example, the candidate combinations determined by the network device for the terminal devices #1 to #6 are Figure 8 The candidate combinations shown are consistent, and their detailed description is omitted here to avoid redundancy.

[0224] Optionally, the terminal device receives the initial data service #1 sent by the network device in time slot 0. For example, UE6 receives the initial data service #1 in time slot 0. Specifically, UE6 receives DMRS #B1 in symbol 2 and receives UE6 PDSCH #B in symbols 12 and 13. UE6 demodulates UE6 PDSCH #B according to DMRS #B1.

[0225] Optionally, UE6 demodulates the initial data service #1 in error and feeds back HARQ-ACK information. The network device sends a retransmission DCI to schedule UE6 to receive the retransmitted data in time slot n. UE6 receives PDSCH#B (i.e., the initial data service #1 in time slot 0) in symbols 12 and 13 in time slot n, and receives DMRS#B2 in symbol 12 in time slot n. Furthermore, the retransmitted data PDSCH#B is not demodulated using DMRS#B1 in symbol 2 in time slot n, but rather using DMRS#B2 received in symbol 12. It should be understood that retransmitted data scheduling is performed in the form of dynamic scheduling. Figure 9 The time-frequency domain resource location of PDSCH#B carrying retransmission data is only an example and is not limited.

[0226] It should also be understood that using DMRS#B1 on symbol 2 in time slot n to demodulate the retransmitted PDSCH#B on symbols 12 and 13 in time slot n is not an optimal method.

[0227] Optionally, the network device can also use Figure 9 The RB adjacent to the RB corresponding to time slot n sends DCI indication information, and the DCI is used to instruct UE6 to receive the retransmitted data service in time slot n.

[0228] Optionally, the network device can also use Figure 9 The RB adjacent to the RB corresponding to the time slot n sends DCI indication information, and the DCI is used to instruct the UE6 to receive the retransmitted data service on the adjacent RB.

[0229] According to the above method, when the terminal device retransmits data services, by determining DMRS#B2 and receiving the demodulation reference signal according to the time domain symbol occupied by DMRS#B2, this method can improve the success rate of retransmission and increase the robustness of the system.

[0230] It should be understood that the above is merely an illustrative example and does not limit the embodiments of the present application. For example, in the embodiments of the present application, the candidate combinations determined by the network device for multiple terminal devices may have PDSCHs of different lengths L. It should also be understood that the service data of multiple terminal devices may be sent on different RBs.

[0231] Figure 10 is a schematic block diagram of a communication device 300 provided in an embodiment of the present application. The device 300 includes a transceiver unit 310 and a processing unit 320. The transceiver unit 310 can communicate with the outside world, and the processing unit 320 is used to process data. The transceiver unit 310 can also be referred to as a communication interface or a communication unit. Optionally, the device 300 may also include a storage unit, which can be used to store instructions and / or data, and the processing unit 320 can read instructions and / or data from the storage unit.

[0232] The device 300 can be used to execute the actions performed by the terminal device #1 in the above method embodiment. In this case, the device 300 can be a terminal device or a component or chip configured in the terminal device, etc. The transceiver unit 310 is used to execute the transceiver-related operations on the terminal device side in the above method embodiment, and the processing unit 320 is used to execute the processing-related operations on the terminal device side in the above method embodiment.

[0233] For example, the processing unit 320 may be configured to determine time domain resource allocation configuration information, where the time domain resource allocation configuration information includes a first time domain resource combination.

[0234] For another example, the processing unit 320 can also be used to determine a first time domain resource combination, which includes a first demodulation reference signal DMRS and a first physical downlink shared channel PDSCH. The first DMRS is used to demodulate the first PDSCH, and the time domain resource position of the first DMRS is before the time domain resource position of the first PDSCH.

[0235] Optionally, the transceiver unit 310 is further used to receive first indication information, where the first indication information is used to indicate a first time domain resource combination.

[0236] Optionally, the transceiver unit 310 is further configured to receive first downlink control information DCI before a start position of a time domain resource of the first DMRS, where the first DCI includes the first indication information.

[0237] Optionally, the transceiver unit 310 is further used to receive a second PDSCH, and the first DMRS is further used to demodulate the second PDSCH, where the time domain resource positions of the second PDSCH and the first PDSCH are different.

[0238] Optionally, in a case where the first resource combination corresponds to a time domain resource position of a DMRS, the transceiver unit 310 is further configured to receive the first DMRS at the time domain resource position of the first DMRS.

[0239] Alternatively, the device 300 can be used to execute the actions performed by the network device in the above method embodiment. In this case, the device 300 can be a network device or a component or chip configured in the network device, etc. The transceiver unit 310 is used to execute the transceiver-related operations of the network device in the above method embodiment, and the processing unit 320 is used to execute the processing-related operations of the network device in the above method embodiment.

[0240] For example, the processing unit 320 may be configured to determine time domain resource allocation configuration information, where the time domain resource allocation configuration information includes the first time domain resource combination.

[0241] Optionally, the transceiver unit 310 is configured to send the first DMRS at a time domain resource position of the first DMRS.

[0242] Optionally, the transceiver unit 310 is further configured to send first downlink control information DCI before the time domain resource position of the first DMRS.

[0243] like Figure 11 As shown, an embodiment of the present application further provides a communication device 400. The communication device 400 includes a processor 410, which is coupled to a memory 420. The memory 420 is used to store computer programs or instructions and / or data. The processor 410 is used to execute the computer programs or instructions and / or data stored in the memory 420, so that the method in the above method embodiment is executed.

[0244] Optionally, the communication device 400 includes one or more processors 410.

[0245] Alternatively, as Figure 11 As shown, the communication device 400 may further include a memory 420 .

[0246] Optionally, the communication device 400 may include one or more memories 420 .

[0247] Optionally, the memory 420 may be integrated with the processor 410 or provided separately.

[0248] Alternatively, as Figure 11 As shown, the wireless communication device 400 may further include a transceiver 430, which is used to receive and / or transmit signals. For example, the processor 410 is used to control the transceiver 430 to receive and / or transmit signals.

[0249] For example, the processor 410 is used to implement the processing-related operations performed by the network device 110 in the above method embodiment, and the transceiver 430 is used to implement the sending and receiving-related operations performed by the network device in the above method embodiment.

[0250] Optionally, the processor 410 may be configured to determine time domain resource allocation configuration information.

[0251] Optionally, the transceiver 430 is used to send first indication information, which is used to indicate a first time domain resource combination, and the first time domain resource combination includes a first demodulation reference signal DMRS and a first physical downlink shared channel PDSCH. The first DMRS is used to demodulate the first PDSCH, and the time domain resource position of the first DMRS is before the time domain resource position of the first PDSCH.

[0252] Optionally, the transceiver 430 is further configured to send first downlink control information DCI before the time domain resource position of the first DMRS.

[0253] As another solution, the communication device 400 is used to implement the operations performed by the terminal device in the above method embodiment.

[0254] For example, the processor 410 is used to implement the processing-related operations performed by the terminal device #1 in the above method embodiment, and the transceiver 430 is used to implement the sending and receiving-related operations performed by the terminal device in the above method embodiment.

[0255] Optionally, the processor 410 is further configured to determine time domain resource allocation configuration information.

[0256] Optionally, the transceiver 430 is further configured to receive first downlink control information DCI before the time domain resource position of the first DMRS.

[0257] Optionally, the transceiver 430 is further configured to receive the first DMRS at a time domain resource position of the first DMRS.

[0258] The present application also provides a communication device 500, which can be a terminal device or a chip. The communication device 500 can be used to perform the operations performed by the terminal device in the above method embodiment. When the communication device 500 is a terminal device, Figure 12 A simplified schematic diagram of the structure of the first communication device is shown. For ease of understanding and illustration, Figure 12 In this article, the terminal device is a mobile phone. Figure 12 As shown, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and input and output devices. The processor is mainly used to process communication protocols and communication data, as well as to control the terminal device, execute software programs, process software program data, etc. The memory is mainly used to store software programs and data. The radio frequency circuit is mainly used to convert baseband signals into radio frequency signals and process radio frequency signals. The antenna is mainly used to transmit and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, displays, keyboards, etc., are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal devices may not have input and output devices.

[0259] When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs the baseband signal to the RF circuit. The RF circuit performs RF processing on the baseband signal and then transmits the RF signal to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. For the sake of explanation, Figure 12 Only one memory and processor are shown. In actual terminal devices, one or more processors and one or more memories may exist. A memory may also be referred to as a storage medium or storage device. The memory may be independent of the processor or integrated with the processor, and this is not limited in the present embodiment.

[0260] In the embodiment of the present application, the antenna and radio frequency circuit with transceiver functions can be regarded as the transceiver unit of the terminal device, and the processor with processing function can be regarded as the processing unit of the terminal device.

[0261] like Figure 12 As shown, the terminal device includes a transceiver unit 510 and a processing unit 520. The transceiver unit 510 may also be referred to as a transceiver, a transceiver, a transceiver device, etc. The processing unit 520 may also be referred to as a processor, a processing board, a processing module, a processing device, etc.

[0262] Alternatively, the device in the transceiver unit 510 that implements the receiving function may be considered a receiving unit, and the device in the transceiver unit 510 that implements the transmitting function may be considered a transmitting unit. That is, the transceiver unit 510 includes a receiving unit and a transmitting unit. The transceiver unit may also be sometimes referred to as a transceiver, a transceiver, or a transceiver circuit. The receiving unit may also be sometimes referred to as a receiver, a receiver, or a receiving circuit. The transmitting unit may also be sometimes referred to as a transmitter, a transmitter, or a transmitting circuit.

[0263] For example, in one implementation, the transceiver unit 510 is used to perform a receiving operation of the terminal device, and the processing unit 520 is used to perform a processing action on the terminal device side.

[0264] It should be understood that Figure 12 This is only an example and not a limitation. The terminal device (an example of the first communication device) including the transceiver unit and the processing unit may not rely on Figure 12 The structure shown.

[0265] When the communication device 500 is a chip, the chip includes a transceiver unit and a processing unit. The transceiver unit may be an input / output circuit or a communication interface; the processing unit may be a processor, microprocessor, or integrated circuit integrated on the chip. The input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a trigger, or various logic circuits. The input signal received by the input circuit may be, for example, but not limited to, received and input by a receiver, and the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter. The input circuit and the output circuit may be different circuits or the same circuit. In this case, the circuit functions as an input circuit and an output circuit at different times.

[0266] The embodiment of the present application further provides a communication device 600, which can be a network device or a chip. The communication device 600 can be used to execute the operations executed by the network device in the above method embodiment.

[0267] When the communication device 600 is a network device. Figure 13 A simplified schematic diagram of a base station structure is shown. The base station includes sections 610 and 620. Section 610 is primarily responsible for receiving and transmitting RF signals and converting RF signals to baseband signals; section 620 is primarily responsible for baseband processing and base station control. Section 610 can be commonly referred to as a transceiver unit, transceiver, transceiver circuit, or transceiver. Section 620 is typically the base station's control center, often referred to as a processing unit, responsible for controlling the base station to execute the network device-side processing operations described in the above method embodiments.

[0268] The transceiver unit in section 610, also known as a transceiver or transceiver, includes an antenna and radio frequency circuitry, with the latter primarily responsible for radio frequency processing. Alternatively, the device in section 610 that implements the receiving function can be considered a receiving unit, and the device that implements the transmitting function can be considered a transmitting unit. That is, section 610 includes both a receiving unit and a transmitting unit. The receiving unit can also be referred to as a receiver, receiver, or receiving circuit, and the transmitting unit can be referred to as a transmitter, transmitter, or transmitting circuit.

[0269] Section 620 may include one or more boards, each of which may include one or more processors and one or more memories. The processor is used to read and execute programs in the memory to implement baseband processing functions and control the base station. If multiple boards are present, the boards may be interconnected to enhance processing capabilities. As an optional implementation, multiple boards may share one or more processors, multiple boards may share one or more memories, or multiple boards may simultaneously share one or more processors.

[0270] For example, in one implementation, the transceiver unit of part 610 is used to execute the transceiver-related steps executed by the network device in the embodiment; and part 620 is used to execute the processing-related steps executed by the network device.

[0271] It should be understood that Figure 13 This is only an example and not a limitation. The network device including the transceiver unit and the processing unit may not rely on Figure 13 The structure shown.

[0272] When the communication device 600 is a chip, the chip includes a transceiver unit and a processing unit. The transceiver unit may be an input / output circuit or a communication interface; the processing unit may be a processor, microprocessor, or integrated circuit integrated on the chip. The input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a trigger, or various logic circuits. The input signal received by the input circuit may be, for example, but not limited to, received and input by a receiver, and the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter. The input circuit and the output circuit may be different circuits or the same circuit. In this case, the circuit functions as an input circuit and an output circuit at different times.

[0273] An embodiment of the present application also provides a computer-readable storage medium on which computer instructions are stored for implementing the method executed by the terminal device or the method executed by the network device in the above method embodiment.

[0274] For example, when the computer program is executed by a computer, the computer can implement the method executed by the terminal device or the method executed by the network device in the above method embodiment.

[0275] An embodiment of the present application also provides a computer program product comprising instructions, which, when executed by a computer, enables the computer to implement the method executed by a terminal device or the method executed by a network device in the above method embodiment.

[0276] An embodiment of the present application further provides a communication system, which includes the network device and terminal device in the above embodiment.

[0277] As an example, the communication system includes: the network device and the terminal device in the above embodiment.

[0278] The explanation and beneficial effects of the relevant contents in any of the wireless communication devices provided above may refer to the corresponding method embodiments provided above, and will not be repeated here.

[0279] The method and apparatus provided in the embodiments of the present application can be applied to a terminal device or a network device, which may include a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer may include hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also known as main memory). The operating system of the operating system layer may be any one or more computer operating systems that implement business processing through processes, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer may include applications such as a browser, an address book, a word processing software, and an instant messaging software.

[0280] The embodiments of the present application do not specifically limit the specific structure of the execution subject of the method provided in the embodiments of the present application; as long as it is capable of communicating according to the method provided in the embodiments of the present application by running a program that records the code of the method provided in the embodiments of the present application, it is sufficient. For example, the execution subject of the method provided in the embodiments of the present application may be a terminal device, or a functional module in the terminal device that is capable of calling and executing the program.

[0281] Various aspects or features of the embodiments of the present application can be implemented as methods, devices, or articles of manufacture using standard programming and / or engineering techniques. As used herein, the term "article of manufacture" can encompass a computer program accessible from any computer-readable device, carrier, or medium. For example, a computer-readable medium can include, but is not limited to, magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical disks (e.g., compact discs (CDs), digital versatile discs (DVDs), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memories (EPROMs), cards, sticks, or key drives, etc.).

[0282] The various storage media described herein may represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0283] It should be understood that the processor mentioned in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0284] It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM). For example, RAM can be used as an external cache. By way of example and not limitation, RAM may include the following forms: static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0285] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) can be integrated into the processor.

[0286] It should also be noted that the memory described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0287] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of this application.

[0288] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0289] In the several embodiments provided in the embodiments of the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0290] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0291] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0292] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0293] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the embodiments of the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A wireless communication method, characterized in that: include: Sending first indication information, where the first indication information is used to indicate a first time domain resource combination, where the first time domain resource combination includes a first demodulation reference signal DMRS and a first physical downlink shared channel PDSCH, where the first DMRS is used to demodulate the first PDSCH, and a time domain resource position of the first DMRS is before a time domain resource position of the first PDSCH; Sending the first DMRS at a time domain resource location of the first DMRS; The time domain resource position of the first DMRS is a plurality of time domain symbols, and at least one time domain symbol among the plurality of time domain symbols is located before the start position of the time domain resource of the first PDSCH; When some of the multiple time domain symbols are located before the starting position of the time domain resources of the first PDSCH, one or more time domain symbols among the multiple time domain symbols are located after the starting position of the time domain resources of the first PDSCH.

2. The method according to claim 1, characterized in that The method further comprises: Time domain resource allocation configuration information is determined, where the time domain resource allocation configuration information includes the first time domain resource combination.

3. The method according to claim 2, characterized in that The sequence initialization parameter of the first DMRS is a cell identifier.

4. The method according to any one of claims 1 to 3, characterized in that When the first PDSCH carries initially transmitted data, the first DMRS is sent at the time domain resource position of the first DMRS.

5. The method according to any one of claims 1 to 3, characterized in that The method further comprises: First downlink control information DCI is sent before the time domain resource starting position of the first DMRS, where the first DCI includes the first indication information.

6. The method according to any one of claims 1 to 3, characterized in that The method further comprises: A second PDSCH is sent, and the first DMRS is also used to demodulate the second PDSCH, where the time domain resource positions of the second PDSCH and the first PDSCH are different.

7. The method according to any one of claims 1 to 3, characterized in that The first time domain resource combination also includes a second DMRS, where the second DMRS is used to demodulate the first PDSCH and is located within the time domain resources of the first PDSCH.

8. The method according to claim 7, characterized in that The method further comprises: When the first PDSCH carries retransmission data, the second DMRS is sent at the time domain resource position of the second DMRS.

9. The method according to claim 7, characterized in that The method further comprises: Sending a second DCI, where a time domain and / or frequency domain resource position of the second DCI is located before a time domain and / or frequency domain resource position of the first PDSCH; and Send the second DMRS.

10. A wireless communication method, characterized in that: include: receiving first instruction information; Determining a first time domain resource combination according to the first indication information, where the first time domain resource combination includes a first demodulation reference signal DMRS and a first physical downlink shared channel PDSCH, where the first DMRS is used to demodulate the first PDSCH, and a time domain resource position of the first DMRS is before a time domain resource position of the first PDSCH; receiving the first DMRS at the time domain resource position of the first DMRS; the time domain resource position of the first DMRS is a plurality of time domain symbols, at least one time domain symbol of the plurality of time domain symbols being located before the start position of the time domain resource of the first PDSCH; When some of the multiple time domain symbols are located before the starting position of the time domain resources of the first PDSCH, one or more time domain symbols among the multiple time domain symbols are located after the starting position of the time domain resources of the first PDSCH.

11. The method according to claim 10, characterized in that The method further comprises: Time domain resource allocation configuration information is determined, where the time domain resource allocation configuration information includes at least one of the first time domain resource combinations.

12. The method according to claim 11, characterized in that The sequence initialization parameter of the first DMRS is a cell identifier.

13. The method according to any one of claims 10 to 12, characterized in that When the first PDSCH carries initially transmitted data, the first DMRS is received at the time domain resource position of the first DMRS.

14. The method according to claim 10, characterized in that The method further comprises: First downlink control information DCI is received, where the first DCI includes the first indication information.

15. The method according to any one of claims 10 to 12, characterized in that The first time domain resource combination also includes a second DMRS, where the second DMRS is used to demodulate the first PDSCH and is located within the time domain resources of the first PDSCH.

16. The method according to claim 15, characterized in that The method further comprises: When the first PDSCH carries retransmission data, the second DMRS is received at the time domain resource position of the second DMRS.

17. The method according to claim 15, characterized in that The method further comprises: receiving a second DCI, where a time domain and / or frequency domain resource position of the second DCI is located before a time domain and / or frequency domain resource position of the first PDSCH; and Receive the second DMRS.

18. A wireless communication device, characterized in that: include: a transceiver unit, configured to send first indication information, where the first indication information is used to indicate a first time domain resource combination, where the first time domain resource combination includes a first demodulation reference signal DMRS and a first physical downlink shared channel PDSCH, where the first DMRS is used to demodulate the first PDSCH, and where a time domain resource position of the first DMRS is before a time domain resource position of the first PDSCH; and the transceiver unit is further configured to send the first DMRS at the time domain resource position of the first DMRS; The time domain resource position of the first DMRS is a plurality of time domain symbols, and at least one time domain symbol among the plurality of time domain symbols is located before the start position of the time domain resource of the first PDSCH; When some of the multiple time domain symbols are located before the starting position of the time domain resources of the first PDSCH, one or more time domain symbols among the multiple time domain symbols are located after the starting position of the time domain resources of the first PDSCH.

19. The device according to claim 18, characterized in that The device further comprises: The processing unit is configured to determine time domain resource allocation configuration information, where the time domain resource allocation configuration information includes at least one of the first time domain resource combinations.

20. The device according to claim 19, characterized in that The sequence initialization parameter of the first DMRS is a cell identifier.

21. The device according to any one of claims 18 to 20, characterized in that When the first PDSCH carries initially transmitted data, the transceiver unit is configured to send the first DMRS at a time domain resource position of the first DMRS.

22. The device according to any one of claims 18 to 20, characterized in that The transceiver unit is further configured to send first downlink control information DCI before a time domain resource start position of the first DMRS, where the first DCI includes the first indication information.

23. The device according to any one of claims 18 to 20, characterized in that The transceiver unit is further used to send a second PDSCH, the first DMRS is further used to demodulate the second PDSCH, and the time domain resource position of the second PDSCH is different from that of the first PDSCH.

24. The device according to any one of claims 18 to 20, characterized in that The first time domain resource combination also includes a second DMRS, where the second DMRS is used to demodulate the first PDSCH and is located within the time domain resources of the first PDSCH.

25. The device according to claim 24, characterized in that When the first PDSCH carries retransmission data, the transceiver unit is further configured to send the second DMRS at a time domain resource position of the second DMRS.

26. The device according to claim 24, characterized in that The transceiver unit is further configured to send a second DCI, wherein the time domain and / or frequency domain resource position of the second DCI is located before the time domain and / or frequency domain resource position of the first PDSCH; the transceiver unit is further configured to send the second DMRS.

27. A wireless communication device, characterized in that: include: a transceiver unit, configured to receive first indication information, where the first indication information is used to indicate a first time domain resource combination, where the first time domain resource combination includes a first demodulation reference signal DMRS and a first physical downlink shared channel PDSCH, where the first DMRS is used to demodulate the first PDSCH, and where a time domain resource position of the first DMRS is before a time domain resource position of the first PDSCH; and the transceiver unit is further configured to receive the first DMRS at the time domain resource position of the first DMRS; The time domain resource position of the first DMRS is a plurality of time domain symbols, and at least one time domain symbol among the plurality of time domain symbols is located before the start position of the time domain resource of the first PDSCH; When some of the multiple time domain symbols are located before the starting position of the time domain resources of the first PDSCH, one or more time domain symbols among the multiple time domain symbols are located after the starting position of the time domain resources of the first PDSCH.

28. The device according to claim 27, characterized in that The device further comprises: The processing unit is configured to determine time domain resource allocation configuration information, where the time domain resource allocation configuration information includes at least one of the first time domain resource combinations.

29. The device according to claim 28, characterized in that The sequence initialization parameter of the first DMRS is a cell identifier.

30. The device according to any one of claims 27 to 29, characterized in that When the first PDSCH carries initially transmitted data, the transceiver unit is further configured to receive the first DMRS at a time domain resource position of the first DMRS.

31. The device according to any one of claims 27 to 29, characterized in that The transceiver unit is further configured to receive first downlink control information DCI, where the first DCI includes the first indication information.

32. The device according to any one of claims 27 to 29, characterized in that The first time domain resource combination also includes a second DMRS, where the second DMRS is used to demodulate the first PDSCH and is located within the time domain resources of the first PDSCH.

33. The device according to claim 32, characterized in that When the first PDSCH carries retransmission data, the transceiver unit is further configured to receive the second DMRS at a time domain resource position of the second DMRS.

34. The device according to claim 32, characterized in that The transceiver unit is further configured to receive a second DCI, wherein the time domain and / or frequency domain resource position of the second DCI is located before the time domain and / or frequency domain resource position of the first PDSCH; and the transceiver unit is further configured to receive the second DMRS.

35. A wireless communication device, characterized in that: The processor is coupled to a memory, the memory is used to store computer programs or instructions, and the processor is used to execute the computer programs or instructions in the memory. The method of any one of claims 1 to 9 is performed, or The method of any one of claims 10 to 17 is performed.

36. A computer-readable storage medium, characterized in that The computer readable storage medium stores a computer program or instruction, which, when executed, causes The method of any one of claims 1 to 9 is performed, or The method of any one of claims 10 to 17 is performed.

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