WO2022067649A1

WO2022067649A1 - Dci transmission method, apparatus and system, and chip

Info

Publication number: WO2022067649A1
Application number: PCT/CN2020/119349
Authority: WO
Inventors: 朱非白; 方凯; 胡宏杰
Original assignee: 华为技术有限公司
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2022-04-07

Abstract

A DCI transmission method, apparatus and system, and a chip, which are used for eliminating interference between users during data transmission, thereby improving the performance thereof, and meeting a multi-DCI transmission scenario. The DCI transmission method comprises: a first terminal device receiving first DCI and second DCI, wherein the first DCI is used for scheduling a first data stream of the first terminal device, the second DCI is used for scheduling a second data stream of a second terminal device, and the second data stream causes interference to the first data stream; and the first terminal device being able to demodulate the first data stream according to the first DCI and the second DCI.

Description

A DCI transmission method, device, chip and system

technical field

The present application relates to the field of wireless communication technologies, and in particular, to a DCI transmission method, device, chip and system.

Background technique

There are single user (SU) and multi-user (MU) scenarios in existing communication scenarios. In some scenarios where MUs are paired, there will be interference in data transmission between users, resulting in performance loss.

When the network device sends different data streams, the corresponding transmission weights of the data streams and the downlink reference signal are different. Therefore, in the prior art, the network device can select specific transmission weights to send different data streams to eliminate the need for each user. Since the transmission weights need to avoid each other, the transmission power loss of the network equipment will be large, resulting in performance loss. In addition, when the channel frequency selection and time variation are severe, the selection of transmission weights based on information will be inaccurate. Therefore, it is difficult to eliminate residual interference between the data streams of different users corresponding to the selected transmission weights, which will also cause performance loss. . In addition, if the network device uses a predetermined codebook set to select the transmission weight, there will also be a problem that residual interference between data streams is difficult to eliminate, resulting in performance loss.

It can be seen that in the prior art, there is interference in data transmission between users, resulting in performance loss.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a downlink control information (downlink control information, DCI) transmission method, device, chip, and system, which are used to eliminate interference in data transmission between users, improve performance, and meet multiple DCI transmission scenarios.

In a first aspect, an embodiment of the present application provides a DCI transmission method, including: a network device sends a first DCI and a second DCI, a first terminal device receives the first DCI and the second DCI, and the first DCI The second DCI is used for scheduling the first data flow of the first terminal equipment, and the second DCI is used for scheduling the second data flow DCI of the second terminal equipment, and the second data flow causes interference to the first data flow.

The first DCI may schedule one or more first data streams.

There are one or more second DCIs, and correspondingly, there are one or more second terminal devices. Each second DCI may schedule one or more second data streams.

The network device sends the first DCI of the first terminal device itself and the second DCI that interferes with the first terminal device to the first terminal device, and the first terminal device may, according to the first DCI and the second DCI, The first data stream sent to the first terminal device itself is directly demodulated, so that interference can be directly suppressed, the interference suppression capability of the terminal device can be improved, the interference existing in data transmission between the terminal devices can be eliminated, and the network performance can be improved. Optionally, a second data stream that interferes with the first terminal device may be demodulated according to the first DCI and the second DCI, so as to further improve the interference suppression capability of the terminal device.

In a possible implementation, the network device may further send the first downlink reference signal of the first DCI and the second downlink reference signal of the second DCI to the first terminal device. The first terminal device may receive a first downlink reference signal and at least one second downlink reference signal, where the first downlink reference signal and the second downlink reference signal are used to demodulate the first data stream. Optionally, the first downlink reference signal and the second downlink reference signal may also be used to demodulate the second data stream.

In this implementation, by delivering the first downlink reference signal and the second downlink reference signal to the first terminal device, the network device can ensure that the first terminal device can estimate the channel with the network device as accurately as possible, so as to maximize the It is possible to accurately demodulate the received data stream and improve network performance.

In a possible implementation, the first terminal device may perform channel estimation according to the first downlink reference signal of the first DCI to obtain a first channel estimation result; the first terminal device may also perform channel estimation according to the first downlink reference signal of the first DCI. performing channel estimation on the second downlink reference signal of the second DCI to obtain a second channel estimation result.

In this implementation, the first terminal device can estimate the channel with the network device as accurately as possible according to the first downlink reference signal and the second downlink reference signal, so as to demodulate the received signal as accurately as possible. data flow and improve network performance.

In a possible implementation, the network device may send the first data stream to the first terminal device and send the second data stream to the second terminal device. The first terminal device receives the first data stream, and since the second data stream interferes with the first data stream, the first terminal device may also receive the second data stream.

In this implementation, the first terminal device can directly demodulate the first data stream sent to the first terminal device itself according to the first DCI and the second DCI, so that interference can be directly suppressed and each terminal device can be eliminated. Interference between data transmission and improve network performance. And optionally, the second data stream causing interference to the pair may be demodulated according to the first DCI and the second DCI, so as to further improve the interference suppression capability of the terminal device.

In a possible implementation, the first terminal device demodulates the first data stream according to the first DCI and the second DCI, including:

The first terminal device may demodulate the first data stream according to the first channel estimation result and the second channel estimation result.

In this implementation, the first terminal device can demodulate the received data stream as accurately as possible according to the channel estimation result, thereby improving network performance.

In a possible implementation, before the network device sends the first DCI and the second DCI, the network device may further determine a second data stream that interferes with the first data stream.

In this implementation, the network device sends the first DCI corresponding to the first data stream and the second DCI causing interference to the first terminal device by determining the second data stream that interferes with the first data stream , to ensure that the first terminal device can correctly demodulate the first data stream and eliminate the interference of the second data stream to the first data stream.

In a second aspect, an embodiment of the present application provides a DCI transmission method, including a network device sending a first DCI and a second DCI, a first terminal device receiving the first DCI and the second DCI, and the first DCI indicating time-domain resources and frequency-domain resources used for transmitting retransmission data, the second DCI indicates time-domain resources and frequency-domain resources used for transmitting initial transmission data, and the time-domain resources indicated by the first DCI and the first DCI The time domain resources indicated by the two DCIs are the same, and the frequency domain resources indicated by the first DCI are different from the frequency domain resources indicated by the second DCI;

The network device sends retransmission data on the time domain resources and frequency domain resources indicated by the first DCI, and sends initial transmission data on the time domain resources and frequency domain resources indicated by the second DCI. The first terminal device receives retransmission data on the time domain resources and frequency domain resources indicated by the first DCI, and receives initial transmission data on the time domain resources and frequency domain resources indicated by the second DCI.

When the network device sends the retransmitted data, it will use the full bandwidth to send the retransmitted data, but the retransmitted data may not be able to occupy the full bandwidth, resulting in wasted part of the bandwidth resources that do not send the retransmitted data in the full bandwidth. This application implements In an example, the network device can transmit the retransmission data and the initial transmission data at the same time on the same time domain resource, so as to avoid waste of resources and improve the throughput rate and network performance.

In a possible implementation, before the network device sends the first DCI and the second DCI, the network device may further divide the entire bandwidth of the channel between the network device and the first terminal device into the first subband and a second subband; the network device allocates a first DCI for retransmission data to the first subband, and allocates a second DCI for initial transmission data to the second subband. The first subband is a frequency domain resource used for transmitting retransmission data, and the second subband is a frequency domain resource used for transmitting initial transmission data.

In this implementation, by allocating different DCIs for the retransmission data and the initial transmission data, the network device can transmit the retransmission data and the initial transmission data at the same time, thereby avoiding the waste of resources.

In a third aspect, an embodiment of the present application provides a DCI transmission method, including: a network device sending a first DCI and a second DCI to a terminal device, where the first DCI indicates a time slot and a first subband used for data transmission, The second DCI indicates a time slot and a second subband for transmitting data, the first DCI and the second DCI indicate the same time slot, and the first subband and the second subband are different ; the network device sends the first data on the first subband and sends the second data on the second subband. The terminal device may receive the first data on the first subband and/or receive the second data on the second subband.

When the time slots indicated by the first DCI and the second DCI are the same, the time-frequency resources indicated by the first DCI and the second DCI are the same or different.

In a possible implementation, the first subband and the second subband suffer from different degrees of interference.

If the bandwidth allocated by the network device to the terminal device is located in the subband with greater interference, the corresponding DCI is selected according to the subband with greater interference; Select the corresponding DCI for the smaller subband. If the bandwidth allocated by the network device to the terminal device spans the subband with greater interference and the subband with less interference, the DCI and interference corresponding to the subband with greater interference are used at the same time. The DCI corresponding to the smaller subband performs data transmission. Correspondingly, the terminal device simultaneously uses the DCI corresponding to the subband with greater interference and the DCI corresponding to the subband with less interference to demodulate the data.

In a fourth aspect, embodiments of the present application provide a DCI transmission apparatus/communication apparatus, where the apparatus has the function of implementing the terminal equipment or network equipment in the foregoing method embodiments. These functions can be implemented by hardware or by executing corresponding software by hardware. The hardware or software includes one or more functional modules corresponding to the above-mentioned functions. The terminal equipment includes a first terminal equipment.

In a fifth aspect, an embodiment of the present application provides a DCI transmission device/communication device. The device may be a terminal device or a network device in the above method embodiments, or a chip set in a terminal device or a network device. The communication device It includes a transceiver and a processor, and optionally, also includes a memory, wherein the memory is used to store computer programs or instructions, and the processor is respectively coupled to the memory and the transceiver, and when the processor executes the computer program or instructions, the The communication apparatus executes the method executed by the terminal device or the network device in the foregoing method embodiments.

In a sixth aspect, an embodiment of the present application provides a computer program product, where the computer program product includes: computer program code, when the computer program code is run on a computer, causing the computer to execute the method described in any one of the foregoing aspects.

In a seventh aspect, an embodiment of the present application provides a chip system, the chip system includes a processor and a memory, the processor and the memory are electrically coupled; the memory is used for storing computer program instructions; the processing A processor is used to execute part or all of the computer program instructions in the memory, and when the part or all of the computer program instructions are executed, it is used to implement the method described in any one of the above aspects.

In a possible design, the chip system further includes a transceiver, and the transceiver is configured to send a signal processed by the processor, or receive a signal input to the processor. The chip system may be composed of chips, or may include chips and other discrete devices.

In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed, the method described in any one of the foregoing aspects is implemented.

In a ninth aspect, an embodiment of the present application provides a communication system, and the system may include a (first) terminal device that executes the method described in any of the foregoing aspects, and a network device that executes the method described in any of the foregoing aspects.

For the technical effects that can be achieved by any one of the above-mentioned fourth to ninth aspects and any one of them, please refer to the technical effects that the above-mentioned first, second or third aspects can bring. description, which will not be repeated here.

Description of drawings

FIG. 1 is an architectural diagram of a network system applicable in the embodiment of the application;

FIG. 2 , FIG. 3 , FIG. 4 , and FIG. 6 are schematic flowcharts of a DCI transmission applicable in the embodiments of the present application;

FIG. 5 and FIG. 7 are schematic diagrams of time-frequency domain resources occupied by data transmission applicable in the embodiment of the present application;

FIG. 8 and FIG. 9 are structural diagrams of a DCI transmission apparatus applicable in the embodiments of the present application.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings.

This application will present various aspects, embodiments, or features around a system that may include a plurality of devices, components, modules, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc., and/or may not include all of the devices, components, modules, etc. discussed in connection with the figures. In addition, combinations of these schemes can also be used.

In addition, in the embodiments of the present application, the word "exemplary" is used to mean serving as an example, illustration or illustration. Any embodiment or design described in this application as "exemplary" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of the word example is intended to present a concept in a concrete way.

The network architecture and service scenarios described in the embodiments of the present application are for the purpose of illustrating the technical solutions of the embodiments of the present application more clearly, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. The evolution of the architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

Some terms in the embodiments of the present application are explained below to facilitate understanding by those skilled in the art.

1) Terminal devices, including devices that provide users with voice and/or data connectivity, specifically, include devices that provide users with voice, or include devices that provide users with data connectivity, or include devices that provide users with voice and data connectivity sexual equipment. For example, it may include a handheld device with wireless connectivity, or a processing device connected to a wireless modem. The terminal equipment can communicate with the core network via a radio access network (RAN), exchange voice or data with the RAN, or exchange voice and data with the RAN. The terminal equipment may include user equipment (UE), wireless terminal equipment, mobile terminal equipment, device-to-device (D2D) terminal equipment, vehicle to everything (V2X) terminal equipment , machine-to-machine/machine-type communications (M2M/MTC) terminal equipment, Internet of things (IoT) terminal equipment, light terminal equipment (light UE), subscriber unit ( subscriber unit), subscriber station (subscriber station), mobile station (mobile station), remote station (remote station), access point (access point, AP), remote terminal (remote terminal), access terminal (access terminal), User terminal, user agent, or user device, etc. For example, these may include mobile telephones (or "cellular" telephones), computers with mobile terminal equipment, portable, pocket-sized, hand-held, computer-embedded mobile devices, and the like. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (personal digital assistants), PDA), etc. Also includes constrained devices, such as devices with lower power consumption, or devices with limited storage capacity, or devices with limited computing power, etc. For example, it includes information sensing devices such as barcodes, radio frequency identification (RFID), sensors, global positioning system (GPS), and laser scanners.

As an example and not a limitation, in this embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices or smart wearable devices, etc. It is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. Wait. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-scale, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, which needs to cooperate with other devices such as smart phones. Use, such as all kinds of smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.

The various terminal devices described above, if they are located on the vehicle (for example, placed in the vehicle or installed in the vehicle), can be considered as on-board terminal equipment. For example, the on-board terminal equipment is also called on-board unit (OBU). ).

In this embodiment of the present application, the terminal device may further include a relay (relay). Alternatively, it can be understood that any device capable of data communication with the base station can be regarded as a terminal device.

In the embodiments of the present application, the apparatus for implementing the function of the terminal device may be the terminal device, or may be an apparatus capable of supporting the terminal device to implement the function, such as a chip system, and the apparatus may be installed in the terminal device. In this embodiment of the present application, the chip system may be composed of chips, or may include chips and other discrete devices. In the technical solutions provided by the embodiments of the present application, the technical solutions provided by the embodiments of the present application are described by taking the device for realizing the function of the terminal being a terminal device as an example.

2) Network equipment, including, for example, access network (AN) equipment, such as a base station (for example, an access point or a transmission point), which may refer to an access network that communicates with wireless terminal equipment through one or more cells over the air interface. The device for communication, or for example, a network device in a vehicle-to-everything (V2X) technology is a roadside unit (RSU). The base station may be used to interconvert the received air frames and IP packets, acting as a router between the terminal equipment and the rest of the access network, which may include the IP network. The RSU can be a fixed infrastructure entity supporting V2X applications and can exchange messages with other entities supporting V2X applications. The network device can also coordinate the attribute management of the air interface. For example, the network equipment may include an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in a long term evolution (long term evolution, LTE) system or long term evolution-advanced (LTE-A), Alternatively, it may also include the next generation node B (gNB) in the 5th generation mobile communication technology (the 5th generation, 5G) NR system (also referred to as the NR system for short), or may also include a cloud access network (cloud access network). A centralized unit (CU) and a distributed unit (DU) in a radio access network (Cloud RAN) system, or may be an apparatus for carrying network device functions in a future communication system. The embodiments of this application do not Not limited.

The network equipment may also include core network equipment. The core network equipment includes, for example, an access and mobility management function (AMF) or a user plane function (UPF) and the like.

The network device may also be a device for device-to-device (D2D) communication, machine-to-machine (M2M) communication, Internet of Vehicles, or a device carrying network device functions in a satellite communication system.

3) The terms "system" and "network" in the embodiments of this application may be used interchangeably. "At least one (species)" means one (species) or multiple (species), and "plurality (species)" means two (species) or more than two (species). "And/or", which describes the association relationship of the associated objects, indicates that there can be three kinds of relationships, for example, A and/or B, which can indicate: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects are an "or" relationship. "At least one item(s) below" or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one item (a) of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c may be single or multiple .

And, unless stated to the contrary, the ordinal numbers such as “first” and “second” mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the order, sequence, priority or priority of multiple objects. Importance. For example, the first data packet and the second data packet are only for distinguishing different data packets, but do not indicate the difference in content, priority, sending order, or importance of the two data packets. For another example, the first DCI, the second DCI, the third DCI, the fourth DCI, the fifth DCI, and the sixth DCI are only used to distinguish different DCIs. / Whether the second DCI is the same is not limited. For another example, the first sub-band, the second sub-band, the third sub-band and the fourth sub-band are only to distinguish different sub-bands. The same is not limited.

The communication methods provided in the embodiments of the present application can be applied to various communication systems, for example, satellite communication systems, Internet of things (Internet of things, IoT), narrow-band Internet of things (NB-IoT) systems, global Mobile communication system (global system for mobile communications, GSM), enhanced data rate for GSM evolution (enhanced data rate for GSM evolution, EDGE), wideband code division multiple access system (wideband code division multiple access, WCDMA), code division multiple access 2000 system (code division multiple access, CDMA2000), time division synchronization code division multiple access system (time division-synchronization code division multiple access, TD-SCDMA), long term evolution system (long term evolution, LTE), fifth generation (5G) ) communication systems, such as 5G new radio (NR), and three major application scenarios of 5G mobile communication systems: enhanced mobile broadband (eMBB), ultra-reliable, low-latency communications (ultra reliable low latency communications) , uRLLC) and massive machine type communications (mMTC), or other or future communication systems.

In order to facilitate the understanding of the embodiments of the present application, the application scenarios used in the embodiments of the present application are described with the network architecture shown in FIG. 1 , and the network architecture can be applied to the above-mentioned various communication systems. The network architecture shown in FIG. 1 includes network devices and terminal devices, and the number of the network devices may be one or more, and the number of the terminal devices may be one or more (as shown in FIG. 1 , two terminals equipment), the types and quantities of network equipment and terminal equipment are not limited in the embodiments of this application.

The network device may also be understood as a downlink transmission transmission point. The network device can implement scheduling of downlink resources, and optionally, a downlink resource scheduling module in the network device can deliver DCI and a data stream corresponding to the DCI to the terminal device. The data stream corresponding to the DCI refers to the data stream scheduled by the DCI.

The terminal device may receive downlink scheduling information, for example, a receiver module in the terminal device may receive downlink scheduling information. In addition, the terminal device can also implement functions such as channel estimation, channel equalization, and signal/information demodulation. It can be understood that one terminal device corresponds to one (scheduling) user, so in this embodiment of the present application, the concepts of terminal device and (scheduling) user may be used interchangeably.

Generally, the terminal device demodulates the received data stream according to the instruction of the DCI, thereby realizing the service. However, the following problems exist in the DCI transmission process in the prior art.

Question one:

There are SU and MU scenarios in existing communication scenarios. In some scenarios where MUs are paired, data transmission between users may interfere, resulting in performance loss.

When the network device sends different data streams, the corresponding transmission weights of the data streams and the downlink reference signal are different. Therefore, in the prior art, the network device can select specific transmission weights to send different data streams to eliminate the need for each user. Because the transmission weights need to avoid each other, that is, the transmission weights need to be kept different, which will lead to a large loss of transmission power of the network device, resulting in performance loss. In addition, when the channel frequency selection and time variation are severe, the selection of transmission weights based on information will be inaccurate. Therefore, it is difficult to eliminate residual interference between the data streams of different users corresponding to the selected transmission weights, which will also cause performance loss. . In addition, if the network device uses a predetermined codebook set to select the transmission weight, there will also be a problem that residual interference between data streams is difficult to eliminate, resulting in performance loss.

Based on this, an embodiment of the present application provides a DCI transmission method, and the DCI transmission method provided by the embodiment of the present application is applicable to the communication system shown in FIG. 1 . In this method, the first terminal equipment can receive the first DCI of the first terminal equipment and the second DCI of other terminal equipment, and the data flow of other terminal equipment interferes with the data flow of the first terminal equipment, the first terminal equipment The received data stream can be jointly detected according to the first DCI and the second DCI, the data stream of the first terminal device can be detected, and the data stream of other terminal devices can be optionally detected, thereby eliminating the data streams of other terminal devices. The interference caused by the data flow to the first terminal device improves the performance. Referring to Fig. 2, the specific flow of the DCI transmission method may include:

S201: A network device sends a first DCI and a second DCI to a first terminal device, and the first terminal device receives the first DCI and the second DCI, where the first DCI is used to schedule the first DCI The first data flow, the second DCI is used to schedule the second data flow of the second terminal device, and the second data flow causes interference to the first data flow.

The first DCI may schedule one or more second data streams.

There may be one or more second DCIs, and each second DCI may also schedule one or more second data streams.

Before this S201, the network device may further determine a second data flow that interferes with the first data flow, so that the first DCI used to schedule the first data flow and the second data flow that is used to schedule the interference The second DCI is sent to the first terminal device to ensure that the first terminal device can correctly demodulate the first data stream, and optionally demodulate the second data stream that causes interference, thereby eliminating the second data stream flow interference with the first data flow.

There is a high correlation between the first data flow and at least one second data flow, that is, the at least one second data flow is a high correlation flow of the first data flow. When determining whether other data streams are highly correlated streams of the first data stream, the network device may determine whether the following conditions are met: the (downlink) transmission weight of the other terminal equipment is equal to the (downlink) transmission weight of the first terminal equipment. Whether the correlation satisfies the first value range, or the channel of other terminal equipment is the same as the channel of the first terminal equipment. Wherein, the correlation between the (downlink) transmission weights of the other terminal equipment and the (downlink) transmission weights of the first terminal equipment can be calculated by a certain algorithm, which is not implemented in this embodiment of the present application. limited.

The first data stream is the data stream that the first terminal device actually expects to receive, so it can be considered that the first data stream is a real data stream. Correspondingly, the first DCI is used to schedule the first data stream , so the first DCI can be considered to be the real DCI. The second data stream is a data stream that the first terminal device does not expect to receive and causes interference to the first data stream. Therefore, it can be considered that the second data stream is a virtual data stream. Correspondingly, The second DCI is used to schedule the second data stream, so the second DCI can be considered as a virtual DCI. That is to say, although the first terminal device can receive both the first data stream and the second data stream, since the first data stream is actually sent by the network device to the second data stream For a terminal device, the second data stream is actually sent by the network device to the second terminal device, but is received by the first terminal device due to interference. Therefore, for the first terminal device, the first data stream is The stream is a real data stream, and the second data stream is a virtual data stream. The first DCI is used to schedule real data streams, and the second DCI is used to schedule virtual data streams. Therefore, for the first terminal device, the first DCI is a real DCI, and the second DCI is a virtual data stream. DCI.

Optionally, the network device may also send indication information to the first terminal device, indicating that the first DCI is used to schedule the first data stream, and the second DCI is used to schedule the second data stream that causes interference . It can also be understood that the indication information is used to indicate that the first DCI is a real DCI and the second DCI is a virtual DCI.

In this S201, the network device may send the first DCI and the second DCI to the first terminal device through a physical downlink control channel (PDCCH) channel or other methods.

The network device may also send the first downlink reference signal of the first DCI and the second downlink reference signal of the second DCI to the first terminal device. The first downlink reference signal and the second downlink reference signal are used for channel estimation and demodulation of the first data stream. If there are one or more second DCIs, there are also one or more second downlink reference signals, and the second DCIs and the second downlink reference signals are in one-to-one correspondence. In this embodiment of the present application, the downlink reference signal may be a demodulation reference signal (demodulation reference signal, DMRS), or other downlink reference signals used for channel estimation.

S202: The network device sends a first data stream to the first terminal device, and sends a second data stream to the second terminal device; the first terminal device receives the first data stream and the second data stream data flow.

During the actual data sending process, the network device only sends the first data stream to the first terminal device, and the first terminal device expects to receive only the first data stream, but because the second data stream affects the first data stream. Therefore, when the network device sends the second data stream to the second terminal device, the first terminal device will actually receive the second data stream. At this time, the first terminal device It is necessary to accurately demodulate the first data stream from the received multiple data streams.

It can be understood that the first data stream sent by the network device to the first terminal device may be one or more data streams. In this embodiment of the present application, only the first data stream is one data stream as: For illustration, the present application is also applicable to the scenario in which the first data stream is multiple data streams.

In this S202, the network device may send the first data stream and the second data stream through a physical downlink shared channel (PDSCH) or other methods, and the first terminal device may send the first data stream through the PDSCH channel or other methods To receive the first data stream, the second terminal device may receive the second data stream through a PDSCH channel or other means.

S203: The first terminal device demodulates the first data stream according to the first DCI and the second DCI.

Optionally, the first terminal device may further demodulate the second data stream according to the first DCI and the second DCI.

In S203, the first terminal device may further perform channel estimation according to the first downlink reference signal to obtain a first channel estimation result; and perform channel estimation according to the second downlink reference signal to obtain a second channel estimation result. The first terminal device demodulates the first data stream according to the first channel estimation result and the second channel estimation result.

Optionally, the first terminal device demodulates the second data stream according to the first channel estimation result and the second channel estimation result. The first terminal device can directly use the demodulated second data stream as an interference stream, so that interference can be directly suppressed.

As shown in Figure 3, a specific embodiment is used to illustrate the interaction flow of DCI transmission, including the following steps:

Optionally, S301: The base station 1 selects the virtual data stream of the terminal device 1.

For example, the real data stream of the terminal device 1 includes S1_1, and the virtual data stream of the terminal device 1 includes S2_1, S2_2 and S3_1. The DCI used for scheduling the real data flow is the real DCI, and the DCI used for scheduling the virtual data flow is the virtual DCI.

The real DCI of the S1_1 used for scheduling the terminal device 1 is DCI1. The S2_1 and S2_2 are delivered to the terminal device 2, and the virtual DCI of the S2_1 and S2_2 used for scheduling the terminal device 2 is DCI2. S3_1 is delivered to the terminal device 3, and the virtual DCI of the S3_1 used for scheduling the terminal device 3 is DCI3.

S302: The base station 1 sends the real DCI and virtual DCI of the terminal device 1 to the terminal device 1 through the PDCCH channel or other means. The terminal device 1 receives the real DCI and virtual DCI.

That is, the base station 1 sends real DCI (eg DCI1 ) and virtual DCI (eg DCI2 and DCI3 ) to the terminal device 1 .

S303: The base station 1 sends the demodulation reference signal (demodulation reference signal, DMRS) 1 of the DCI1, the DMRS2 of the DCI2, and the DMRS3 of the DCI3 to the terminal device 1. The terminal device 1 receives DMRS1, DMRS2 and DMRS3.

It can be understood that, DMRS1, DMRS2 and DMRS3 can also be replaced with other downlink reference signals used for channel estimation.

Optionally, the method further includes S304: the terminal device 1 performs channel estimation according to DMRS1 to obtain a first channel estimation result H1, performs channel estimation according to DMRS2 to obtain a second channel estimation result H2, and performs channel estimation according to DMRS3 to obtain a third channel. Estimated result H3.

H1, H2 and H3 are the channel estimation results from the base station to the terminal equipment 1, H1 is the channel estimation result of the equivalent channel of the base station sending DMRS1 to the terminal equipment 1, and H2 is the equivalent channel of the base station sending DMRS2 to the terminal equipment 1. The channel estimation result, H3 is the channel estimation result of the equivalent channel that the base station sends DMRS3 to the terminal device 1 .

S305: The base station 1 weights the data of the terminal device 1 according to the transmission weight of the terminal device 1, and sends the weighted data S1_1 to the terminal device 1 through the PDSCH channel. The data is weighted, the weighted data S2_1 and S2_2 are sent to the terminal device 2 through the PDSCH channel, the data of the terminal device 3 is weighted according to the transmission weight of the terminal device 3, and the weighted data S3_1 is sent through the PDSCH channel to terminal device 3. The terminal device 1 receives S1_1 sent to the terminal device 1 , S2_1 and S2_2 sent to the terminal device 2 , and S3_1 sent to the terminal device 3 .

S2_1, S2_2, and S3_1 will reach the terminal device 1 through the physical channel from the base station to the terminal device 1, and be received by the terminal device 1, thereby causing interference to the S1_1 that the terminal device 1 actually wants to receive.

In this embodiment of the present application, data is also called data symbol, and the two can be used interchangeably.

Optionally, the method further includes S306: the terminal device 1 demodulates S1_1 according to H1, H2, H3, and DCI1, DCI2, and DCI3.

Optionally, the terminal device 1 may also demodulate S2_1 and S2_2, and/or demodulate S3_1 according to H1, H2, H3 and DCI1, DCI2, and DCI3.

Here, the embodiment is described with a scenario. The following assumptions exist in this scenario: the number of transmit antennas of the base station is 64, the number of receive antennas of the terminal device 1 is 4, and the base station sends the DMRS pilot symbols or data symbols to the terminal device 1. The number of streams is 2, and the number of streams in which the base station sends DMRS pilot symbols or data symbols to the terminal device 2 is 2. That is, the base station sends two data streams to terminal device 1 and two data streams to terminal device 2 . The data symbols are data symbols in the data stream.

When the base station sends the second data stream to the terminal device 2, the data symbols will be weighted by the transmission weight of the terminal device 2, and the weighted data symbols will reach the destination device through the physical channel from the base station to the terminal device 1. The terminal device 1 is received by the terminal device 1, thereby causing interference to the terminal device 1.

The terminal device 1 can calculate the equalization coefficient according to the received DMRS pilot symbols, and then detect the data symbols in the real data stream from the received data symbols according to the calculated equalization coefficients.

The DMRS pilot symbols received by the terminal device 1 satisfy the following formula: y _1,4×1 =H _1,4×64 P _1,64×2 s _1,2×1 +H _1,4×64 P _{2, 64×2} s _2,2×1 +n _4×1 . Among them, y ₁ is the DMRS symbol received by the terminal device 1, the dimension is 4*1, H 1, _4×64 is the physical channel from the base station to the terminal device 1, the dimension is 4*64, P 1, _64×2 is the base station to The transmission weight used for the weighting of terminal equipment 1 (for both DMRS pilot signals and data symbols), the dimension is 64*2, s 1, _2×1 is the pilot symbol of terminal equipment 1, and the dimension is 2*1, P 2, _64×2 is the transmission weight used by the base station to weight the terminal device 2 (both for DMRS pilot symbols and data symbols), dimension 64*2, s 2, _{2× 1} is the pilot symbol of the terminal device 2, the dimension is 2*1, and n _4×1 is the noise received by the terminal device 1, and the dimension is 4*1. H ₁ P ₁ s ₁ is the real symbol that the terminal device 1 wants to receive, and both H ₁ P ₂ s ₂ and n are interference.

In the traditional detection method, the base station sends P _1,64×2 to the terminal equipment 1, and when the terminal equipment 1 calculates the equalization coefficient:

First perform channel estimation on the equivalent channel from the pilot symbol of terminal equipment 1 to terminal equipment 1: He _,1,4× 2≈H _1,4×64 P _1,64×2 ; The covariance of the interference noise is estimated: R _1,4×4 =(y _1,4×1 -H _e,1,4×2 s _1,2×1 )(y _1,4×1 -H _{e, 1,4×2} s _1,2×1 ) ^H ; finally calculate the minimum mean squared error (MMSE) equalization coefficient:

Suppose the data symbol received by terminal device 1 is: y _{data 1,4×1} =H _1,4×64 P _1,64×2 s _{data 1,2×1} +H _1,4×64 P _{2,64× 2} s _{data 2,2×1} +n _4×1 , the terminal device 1 determines the product of W _1,2×4 and y _{data 1,4×1} as the data symbol in the detected real data stream.

In this application, the base station sends P 1, _64×2 and P 2, _64×2 to terminal device 1. When terminal device 1 calculates the equalization coefficient:

First perform channel estimation on the equivalent channel from the pilot symbol of terminal equipment 1 to terminal equipment 1: _He,1,4× 4≈[H _1,4×64 P _1,64×2 , H _1,4×64 P _2,64×2 ]; then estimate the covariance of the interference noise received by the terminal device 1:

is the noise covariance received by the terminal device 1, the dimension is 1*1, and I _4×4 is the identity matrix; finally calculate the MMSE equalization coefficient:

The data symbols received by the receiving terminal device 1 are: y _{data 1,4×1} =H _1,4×64 P _1,64×2 s _{data 1,2×1} +H _1,4×64 P _{2,64× 2} s _{data 2,2×1} +n _4×1 , terminal device 1 takes the first two rows (ie the first row and the second row) of W _1,4×4 and multiplies the y _{data 1,4×1} by The product is determined to be the detected data symbol in the real data stream. Optionally, the terminal device 1 multiplies the last two rows (ie, the third row and the fourth row) of W 1, _4×4 and the y _{data 1, 4×1} , and determines the product as the detected virtual data stream. data symbol.

It can be seen from the above that the network device sends both the DCI for scheduling the real data stream and the virtual data stream to the first terminal device, and sends the downlink reference signal for demodulating the real data stream to the first terminal device, and the terminal device can directly decode the DCI of the real data stream and the virtual data stream. Call out the data of the interference flow, so as to directly suppress the interference and improve the interference suppression capability of the terminal device, so that the SINR of the signal to interference plus noise ratio (signal to interference plus noise ratio) when each data stream of the terminal device is received increases, thereby improving the Throughput, improve network performance.

Question two:

During the communication process between the network device and the terminal device, the initial transmission data may be sent, and the retransmission data may be sent. Taking the sending of retransmitted data as an example, when the network device sends the retransmitted data, it will use the full bandwidth to send the retransmitted data, and the retransmitted data may not be able to occupy the full bandwidth, resulting in no retransmitted data being sent in the full bandwidth. Some bandwidth resources are wasted.

Based on this, an embodiment of the present application provides a DCI transmission method, and the DCI transmission method provided by the embodiment of the present application is applicable to the communication system shown in FIG. 1 . In this method, the first terminal device receives a third DCI and a fourth DCI, the third DCI indicates time domain resources and frequency domain resources used for transmitting retransmission data, and the fourth DCI indicates a time domain resource used for transmitting initial transmission The time domain resources and frequency domain resources of the data, the time domain resources indicated by the third DCI are the same as the time domain resources indicated by the fourth DCI, and the frequency domain resources indicated by the third DCI are the same as those indicated by the fourth DCI The frequency domain resources are different; the first terminal device receives retransmission data on the time domain resources and frequency domain resources indicated by the third DCI, and receives the initial transmission on the time domain resources and frequency domain resources indicated by the fourth DCI data, the first terminal device can receive the retransmission data and the initial transmission data at the same time, thereby avoiding resource waste. Referring to Fig. 4, the specific flow of the DCI transmission method may include:

S401: The network device sends the third DCI and the fourth DCI, the first terminal device receives the third DCI and the fourth DCI, and the third DCI indicates the time domain resource and the frequency domain resource for transmitting the retransmission data, so The fourth DCI indicates the time domain resources and frequency domain resources used for transmitting initial transmission data, the time domain resources indicated by the third DCI are the same as the time domain resources indicated by the fourth DCI, and the time domain resources indicated by the third DCI are the same. The frequency domain resources are different from the frequency domain resources indicated by the fourth DCI.

That is, the third DCI includes information on time-domain resources and frequency-domain resources for transmitting retransmission data, and the fourth DCI includes information on time-domain resources and frequency-domain resources for transmitting initial transmission data.

When scheduling downlink resources for the first terminal device, the network device may allocate part of the frequency domain resources on the same time domain resource for retransmission data of the first terminal device, and select a part of the frequency domain resources for the retransmission data of the first terminal device. A third DCI suitable for retransmission data is determined, and a part of the frequency domain is allocated for the initially transmitted data of the first terminal device, and a fourth DCI suitable for the initially transmitted data is selected for this part of the frequency domain. For example, the first subband is allocated to transmit retransmission data, and the second subband is allocated to transmit initial transmission data, and the frequency domain resources of the first subband and the second subband are different.

For example, the time domain resource may be a time slot.

The third DCI is different from the fourth DCI, and the first subband and the second subband do not overlap, that is, the frequency domain resources of the first subband and the second subband are different.

S402: The network device sends retransmission data on the time domain resources and frequency domain resources indicated by the third DCI, and sends initial transmission data on the time domain resources and frequency domain resources indicated by the fourth DCI, The first terminal device receives retransmission data on the time domain resources and frequency domain resources indicated by the third DCI, and receives initial transmission data on the time domain resources and frequency domain resources indicated by the fourth DCI.

Sending the retransmission data and the initial transmission data by the network device on the same time domain resource can be regarded as sending the retransmission data and the initial transmission data at the same time.

The network device may execute S402 to simultaneously send retransmission data and initial transmission data under the following conditions:

Condition 1: The network device determines to send retransmission data and initial transmission data simultaneously according to the set first subband and second subband.

Condition 2: If the retransmission data or the initial transmission data cannot occupy the full bandwidth, the network device can send the retransmission data and the initial transmission data at the same time.

The third DCI may further include indication information of retransmission data. The fourth DCI may further include indication information of the initially transmitted data.

The following description is given in conjunction with the schematic diagram of time-frequency domain resources occupied during data transmission. The horizontal axis is the time slot sequence number, the vertical axis is the frequency domain resources, the white box is the data that is scheduled for initial transmission and does not need to be retransmitted, and the black box is the data that needs to be retransmitted. Data, the shaded box is the data that is retransmitted and does not need to be retransmitted. Acknowledgment (ACK) indicates that the network device receives information that certain data fed back by the terminal device does not need to be retransmitted, and non-acknowledgment (NACK) indicates that the network device receives information that certain data fed back by the terminal device needs to be retransmitted. For example, as shown in (a) of FIG. 5 , in the prior art, initially transmitted data or retransmitted data will occupy the full bandwidth. When the initial transmitted data or retransmitted data cannot occupy the full bandwidth, resources will be wasted. As shown in (b) of FIG. 5 , in the embodiment of the present application, the network device confirms that a certain initial data transmission fails and needs to be retransmitted, the network device uses the same time slot (the time slot sequence number in the figure is 8), according to DCI1 sends retransmission data (that is, the initial data of the transmission failure), and sends other initial transmission data (different from the initial data of the transmission failure) according to DCI0, and DCI0 and DCI1 are different.

It can be seen that in this embodiment, the network device can send the retransmission data and the initial transmission data on the same time slot to avoid waste of resources, and can improve the flexibility of the retransmission data and the initial transmission data in selecting DCI, and improve the selection of DCI data. Flexibility on slots and subbands to improve throughput and network performance.

Question three:

In the existing data transmission process, the data in the full bandwidth schedules the same DCI or avoids the interference bandwidth, but in the actual scenario, due to the complexity of the multipath propagation characteristics and the complexity of the interference situation, the SINR corresponding to each data stream and each subband is The difference can reach 10 to 20 decibels (dB) or even higher, and the SINR difference is large, resulting in performance loss.

Exemplarily, the problem exists in the following scenarios:

Scenario 1. When the LTE and NR communication systems share the spectrum, the bandwidth of 100M (MB per second, megabits per second) may contain 40M interference subbands.

Scenario 2. In the atmospheric duct interference scenario, some sub-bands are only interfered by neighboring cells, and some sub-bands may be additionally interfered by strong air ducts.

Based on this, an embodiment of the present application provides a DCI transmission method, and the DCI transmission method provided by the embodiment of the present application is applicable to the communication system shown in FIG. 1 . In this method, the network device sends a fifth DCI and a sixth DCI to the terminal device, the fifth DCI indicates a time slot and a third subband for data transmission, and the sixth DCI indicates a time slot for data transmission and the fourth subband, the time slots indicated by the fifth DCI and the sixth DCI are the same, and the third subband and the fourth subband are different, so that a more suitable DCI is selected for different resources, improving performance. As shown in FIG. 6 , the specific flow of the DCI transmission method may include:

S601: The network device divides the entire bandwidth of the channel between the network device and the terminal device into at least two subbands, and different subbands suffer from different degrees of interference.

The network device may divide the full bandwidth into multiple subbands according to different interference degrees, and the interference degrees of different subbands are different. The full bandwidth is the entire bandwidth of the channel between the network device and the terminal device. In the embodiments of the present application, the full bandwidth refers to the full bandwidth of the terminal device, which depends on the hardware module of the terminal device and the bandwidth allocated by the network device for data transmission to the terminal device, that is to say, different The full bandwidth of the end device may vary.

The network equipment allocates different DCIs for different subbands.

For example, the at least two subbands include a third subband and a fourth subband, the third subband and the fourth subband suffer from different degrees of interference, and the network device allocates the third subband to the third subband Five DCIs, that is, the fifth DCI includes the information of the third subband used for data transmission, and the network device allocates the sixth DCI to the fourth subband, that is, the sixth DCI includes the information of the third subband used for transmitting data Information on the fourth subband. Optionally, the third subband is a subband that suffers from greater interference, and the fourth subband is a subband that suffers less interference.

S602: The network device sends a fifth DCI and/or a sixth DCI to the terminal device, where the fifth DCI indicates a time slot and a third subband for data transmission, and the sixth DCI indicates a time slot for data transmission and the fourth subband.

The time slots indicated by the fifth DCI and the sixth DCI are the same. It can be understood that the time slots indicated by the fifth DCI and the sixth DCI are the same, and the time domain resources indicated by the fifth DCI and the time domain resources indicated by the sixth DCI are the same or different.

The third subband and the fourth subband are different, and the interference levels of the third subband and the fourth subband are different.

In this S602, the network device may allocate a subband to the terminal device, and the subband allocated by the network device to the terminal device may be located in the frequency domain range of the third subband, or may be located in the In the frequency domain range of the fourth subband, a part may be located in the frequency domain range of the third subband, and another part may be located in the frequency domain range of the fourth subband.

Optionally, the network device may send the DCI indicating the subband to the terminal device according to the subband allocated to the terminal device. For example, if the subband allocated by the network device to the terminal device is within the frequency domain of the third subband, the network device sends the fifth DCI to the terminal device; if the network device is the The subband allocated by the terminal device is located in the frequency domain range of the fourth subband, and the network device sends the sixth DCI to the terminal device; if a part of the subband allocated by the network device for the terminal device is located in the is within the frequency domain range of the third subband, and another part is within the frequency domain range of the fourth subband, the network device sends the fifth DCI and the sixth DCI to the terminal device.

Or optionally, no matter which frequency domain range the subband allocated to the terminal device is located, the network device may send the fifth DCI and the sixth DCI to the terminal device. In this way, the terminal device can demodulate data transmitted on different subbands, thereby improving the detection capability and flexibility of the terminal device.

S603: The network device sends data on the first subband and sends data on the second subband. The terminal device receives data on the first subband and/or transmits data on the second subband.

In a possible implementation manner, if the subband allocated for the terminal device is located within the frequency domain range of the third subband, in this S603, the network device may send on the third subband data, the terminal device receives data on the third subband. The terminal device may also demodulate the received data according to the fifth DCI. For example, if the subband allocated to the terminal device is in the third subband that suffers from greater interference, the network device may select DCI0 according to the third subband that suffers from greater interference, and use DCI0 to schedule data, and the terminal device may The data received on the third subband is demodulated based on DCIO.

In another possible implementation manner, if the subband allocated for the terminal device is located in the frequency domain range of the fourth subband, in this S603, the network device may be on the fourth subband data is sent, and the terminal device receives data on the fourth subband. The terminal device may also demodulate the received data according to the sixth DCI. For example, the subband allocated to the terminal device is in the fourth subband with less interference, the network device may select DCI1 according to the fourth subband with less interference, and use DCI1 to schedule data, the terminal device may The data received on the fourth subband is demodulated based on DCI1.

In another possible implementation manner, if a part of the subbands allocated to the terminal device is located in the frequency domain range of the third subband, and the other part is located in the frequency domain range of the fourth subband, then In this S603, the network device may send data on the third subband and send data on the fourth subband. For example, the bandwidth allocated to the terminal device spans the third subband that suffers from greater interference and the fourth subband that suffers less interference, and the network device schedules data according to using DCI0 and DCI1, and the terminal device may Support dual DCI detection respectively, use DCI0 to demodulate the data on the third subband with greater interference, and use DCI1 to demodulate the data on the fourth subband with less interference.

The following description will be given with reference to the schematic diagram of time-frequency domain resources occupied during data transmission. The entire bandwidth of the channel between the network device and the first terminal device is divided into disturbed subbands and undisturbed subbands. As shown in (a) of FIG. 7 , in the prior art, regardless of whether there are interfered or undisturbed subbands in the entire bandwidth, the network device schedules data of the full bandwidth based on a specific single DCI (eg, DCI0). Or as shown in (b) of FIG. 7 , in the prior art, the network device schedules the data of the undisturbed subband based on a specific single DCI (eg, DCI0), and no data transmission is performed on the disturbed subband. However, as shown in (c) of FIG. 7 , in the DCI transmission process shown in the embodiment of the present application, the network device schedules the data of the disturbed subband based on DCI0, and schedules the data of the undisturbed subband based on DCI1.

In this embodiment of the present application, the network device may also select appropriate DCIs for different subbands according to different interference levels of the subbands, and different DCIs include different modulation and coding strategy (modulation and coding scheme, MCS) information, such as A smaller MCS can be selected for the subbands with a greater degree of interference, and a larger MCS can be selected for the subbands with a smaller interference degree. The network device selects the MCS order for each subband to better match the SINR of each data stream. It is ensured that the bit error rate of the selected MCS meets the bit error rate target when the corresponding subband is transmitted, and is more in line with the actual transmission requirements, thereby improving the throughput rate and network performance.

It can be understood that, the above embodiments may be used alone or in combination.

The embodiments of the present application may be applicable to multi-stream transmission in SU scenario, multi-stream transmission in MU scenario, simultaneous transmission of retransmission data and initial transmission data of a single user in SU/MU scenario, and reception of single user in SU/MU scenario Data in multiple subbands with different interference levels are transmitted simultaneously.

The embodiments of the present application can also be applied to wireless fidelity (WiFi) scenarios, ultra-reliable low-latency communication (URLLC) data and scenarios where the reliability requirements are common data simultaneous transmission , machine-type communication (MTC) data and ordinary data transmission scenarios.

The communication method of the embodiment of the present application is described in detail above with reference to FIGS. 1 to 7 . Based on the same inventive concept as the above-mentioned DCI transmission method, the embodiment of the present application further provides a DCI transmission device, as shown in FIG. 8 , the The apparatus 800 includes a processing unit 801 and a transceiving unit 802, and the apparatus 800 can be used to implement the methods described in the foregoing method embodiments applied to terminal equipment or network equipment. The terminal equipment includes a first terminal equipment.

In one embodiment, the apparatus 800 is applied to a terminal device, such as a first terminal device.

Specifically, the transceiver unit 802 is configured to receive a first DCI and a second DCI, the first DCI is used to schedule the first data stream of the first terminal device, and the second DCI is used to schedule the second terminal device the second data stream, the second data stream interferes with the first data stream;

The processing unit 801 is configured to demodulate the first data stream according to the first DCI and the second DCI.

In an implementation manner, when demodulating the first data stream according to the first DCI and the second DCI, the processing unit 801 is specifically configured to perform channel estimation according to the first downlink reference signal of the first DCI , obtain a first channel estimation result; perform channel estimation according to the second downlink reference signal of the second DCI to obtain a second channel estimation result; demodulate according to the first channel estimation result and the second channel estimation result the first data stream.

In another embodiment, the apparatus 800 is applied to a network device.

Specifically, the processing unit 801 is configured to determine a first DCI and a second DCI, where the first DCI is used to schedule the first data stream of the first terminal device, and the second DCI is used to schedule the second terminal device the second data stream, the second data stream interferes with the first data stream;

The transceiver unit 802 is configured to send the first DCI and the second DCI to the first terminal device; send the first data stream to the first terminal device; send the first data stream to the second terminal device. Two data streams.

In an implementation manner, the transceiver unit 802 is further configured to send the first downlink reference signal of the first DCI and the second downlink reference signal of the second DCI; the first downlink reference signal and the second downlink reference signal for demodulating the first data stream.

In an implementation manner, the processing unit 801 is further configured to determine a second data stream that interferes with the first data stream before the transceiver unit sends the first DCI and the second DCI to the first terminal device .

Specifically, the transceiver unit 802 is configured to receive a first DCI and a second DCI, the first DCI indicates a time domain resource and a frequency domain resource used for transmitting retransmission data, and the second DCI indicates a time domain resource used for transmission The time domain resources and frequency domain resources of the initial transmission data, the time domain resources indicated by the first DCI and the time domain resources indicated by the second DCI are the same, and the frequency domain resources indicated by the first DCI are the same as the second DCI. The frequency domain resources indicated by the DCI are different; the retransmission data is received on the time domain resources and frequency domain resources indicated by the first DCI, and the initial transmission data is received on the time domain resources and frequency domain resources indicated by the second DCI data;

The processing unit 801 is configured to determine retransmission data and initial transmission data.

In another embodiment, the apparatus 800 is applied to a network device.

Specifically, the processing unit 801 is configured to determine a first DCI and a second DCI, where the first DCI indicates a time domain resource and a frequency domain resource used for transmitting retransmission data, and the second DCI indicates a time domain resource used for transmission The time domain resources and frequency domain resources of the initial transmission data, the time domain resources indicated by the first DCI and the time domain resources indicated by the second DCI are the same, and the frequency domain resources indicated by the first DCI are the same as the second DCI. The frequency domain resources indicated by the DCI are different;

The transceiver unit 802 is configured to send a first DCI and a second DCI; send retransmission data on the time domain resources and frequency domain resources indicated by the first DCI, and send retransmission data on the time domain resources indicated by the second DCI and frequency domain resources, the initial transmission data is sent.

In one embodiment, the apparatus 800 is applied to a network device.

Specifically, the processing unit 801 is configured to determine a first DCI and a second DCI, where the first DCI indicates a time slot and a first subband for transmitting data, and the second DCI indicates a A time slot and a second subband, the time slots indicated by the first DCI and the second DCI are the same, and the first subband and the second subband are different;

The transceiver unit 802 is configured to send the first DCI and the second DCI; send first data on the first subband, and send second data on the second subband.

In one implementation, the first subband and the second subband suffer from different degrees of interference.

It should be noted that the division of modules in the embodiments of the present application is schematic, and is only a logical function division. In actual implementation, there may be other division methods. In addition, each functional unit in each embodiment of the present application It can be integrated in one processing unit, or it can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated unit, if implemented in the form of a software functional unit and sold or used as an independent product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage medium , including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

Based on the same concept as the above DCI transmission method, as shown in FIG. 9 , an embodiment of the present application further provides a schematic structural diagram of a DCI transmission apparatus 900 . The apparatus 900 may be configured to implement the methods described in the foregoing method embodiments applied to terminal equipment or network equipment, and reference may be made to the descriptions in the foregoing method embodiments. The apparatus 900 may be in a terminal device or a network device or be a terminal device or a network device. The terminal equipment includes a first terminal equipment.

The apparatus 900 includes one or more processors 901 . The processor 901 may be a general-purpose processor or a special-purpose processor, or the like. For example, it may be a baseband processor, or a central processing unit. The baseband processor may be used to process communication protocols and communication data, and the central processing unit may be used to control devices (eg, base stations, terminals, or chips, etc.), execute software programs, and process data of software programs. The apparatus may include a transceiving unit for implementing signal input (reception) and output (transmission). For example, the transceiver unit may be a transceiver, a radio frequency chip, or the like.

The apparatus 900 includes one or more of the processors 901, and the one or more processors 901 can implement the method of the first terminal device or the network device in the above-mentioned embodiment.

Optionally, the processor 901 may also implement other functions in addition to implementing the methods in the above-described embodiments.

Optionally, in one design, the processor 901 may execute an instruction, so that the apparatus 900 executes the method described in the foregoing method embodiments. The instructions may be stored in whole or in part in the processor, such as instruction 903, or may be stored in whole or in part in a memory 902 coupled to the processor, such as instructions 904, or may be jointly caused by

instructions

903 and 904. The apparatus 900 executes the methods described in the above method embodiments.

In another possible design, the DCI transmission apparatus 900 may also include a circuit, and the circuit may implement the function of the first terminal device or the network device in the foregoing method embodiments.

In yet another possible design, the apparatus 900 may include one or more memories 902 having stored thereon instructions 904 that may be executed on the processor to cause the apparatus 900 to perform the above-described method methods described in the examples. Optionally, data may also be stored in the memory. Instructions and/or data may also be stored in the optional processor. For example, the one or more memories 902 may store the correspondences described in the foregoing embodiments, or related parameters or tables involved in the foregoing embodiments, and the like. The processor and the memory can be provided separately or integrated together.

In yet another possible design, the apparatus 900 may further include a transceiver 905 and an antenna 906 . The processor 901 may be referred to as a processing unit, and controls an apparatus (terminal or base station). The transceiver 905 may be referred to as a transceiver, a transceiver circuit, or a transceiver unit, etc., and is used to implement the transceiver function of the device through the antenna 906 .

It should be noted that the processor in this embodiment of the present application may be an integrated circuit chip, which has a signal processing capability. In the implementation process, each step of the above method embodiment may be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software. The above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (field programmable gate array, FPGA), or other possible solutions. Programming logic devices, discrete gate or transistor logic devices, discrete hardware components. The methods, steps, and logic block diagrams disclosed in the embodiments of this application can be implemented or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in this embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read only memory (ROM), programmable read only memory (programmable ROM, PROM), erasable programmable read only memory (erasable PROM, EPROM), electrically erasable programmable read only memory Read memory (electrically EPROM, EEPROM) or flash memory. Volatile memory may be random access memory (RAM), which acts as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (direct rambus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

Embodiments of the present application further provide a computer-readable medium on which a computer program is stored, and when the computer program is executed by a computer, implements the DCI transmission method described in any of the foregoing method embodiments applied to a terminal device or a network device.

An embodiment of the present application further provides a computer program product, which implements the DCI transmission method described in any of the foregoing method embodiments applied to a terminal device or a network device when the computer program product is executed by a computer.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server, or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line, DSL) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media. The available media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, high-density digital video discs (DVDs)), or semiconductor media (eg, solid state disks, SSD)) etc.

An embodiment of the present application further provides a processing apparatus, including a processor and an interface; the processor is configured to execute the DCI transmission method described in any of the foregoing method embodiments applied to a terminal device or a network device.

It should be understood that the above-mentioned processing device may be a chip, and the processor may be implemented by hardware or software. When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc.; when implemented by software At the same time, the processor may be a general-purpose processor, which is implemented by reading software codes stored in a memory, and the memory may be integrated in the processor or located outside the processor and exist independently.

An embodiment of the present application further provides a chip, including a logic circuit and an input-output interface, where the input-output interface is used for receiving/outputting code instructions or information, and the logic circuit is used for executing the code instructions or according to the information , so as to execute the DCI transmission method described in any of the above method embodiments applied to a terminal device or a network device.

The chip can implement the functions shown in the processing unit and/or the transceiver unit in the above embodiments.

An embodiment of the present application further provides a communication system, including a terminal device or a network device, where the first terminal device is configured to execute the DCI transmission method described in any of the foregoing method embodiments applied to a terminal device, and the network device For executing the DCI transmission method described in any of the above method embodiments applied to a network device.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. Interchangeability, the above description has generally described the components and steps of each example in terms of function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above may refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, for example, multiple units or components may be combined or integrated. to another system, or some features can be ignored, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or DCI transmission connection may be indirect coupling or DCI transmission connection through some interfaces, devices or units, and may also be electrical, mechanical or other forms of connection.

Units described as separate components may or may not be physically separated, and components shown as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solutions of the embodiments of the present application.

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 alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

From the description of the above embodiments, those skilled in the art can clearly understand that the present application can be implemented by hardware, firmware, or a combination thereof. When implemented in software, the functions described above may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and DCI transmission media including any medium that facilitates transfer of a computer program from one place to another. A storage medium can be any available medium that a computer can access. By way of example and not limitation, computer readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or be capable of carrying or storing instructions or data structures in the form of desired program code and any other medium that can be accessed by a computer. also. Any connection can be appropriately made into a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable , fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fusing of the pertinent medium. Disk and disc, as used in this application, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and blu-ray disc, where disks generally reproduce data magnetically, and discs Lasers are used to optically copy data. Combinations of the above should also be included within the scope of computer-readable media.

In a word, the above descriptions are only preferred embodiments of the technical solutions of the present application, and are not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

A method for transmitting downlink control information DCI, comprising:

The first terminal device receives the first DCI and the second DCI, the first DCI is used to schedule the first data flow of the first terminal device, and the second DCI is used to schedule the second data flow of the second terminal device , the second data stream causes interference to the first data stream;

The first terminal device demodulates the first data stream according to the first DCI and the second DCI.
The method of claim 1, wherein the first terminal device demodulates the first data stream according to the first DCI and the second DCI, comprising:

The first terminal device performs channel estimation according to the first downlink reference signal of the first DCI to obtain a first channel estimation result;

The first terminal device performs channel estimation according to the second downlink reference signal of the second DCI to obtain a second channel estimation result;

The first terminal device demodulates the first data stream according to the first channel estimation result and the second channel estimation result.
A method for transmitting downlink control information DCI, comprising:

The network device sends a first DCI and a second DCI to the first terminal device, where the first DCI is used to schedule the first data stream of the first terminal device, and the second DCI is used to schedule the second data of the second terminal device stream, the second data stream interferes with the first data stream;

sending, by the network device, a first data stream to the first terminal device;

The network device sends the second data stream to the second terminal device.
The method of claim 3, further comprising:

sending, by the network device, a first downlink reference signal of the first DCI and a second downlink reference signal of the second DCI;

The first downlink reference signal and the second downlink reference signal are used to demodulate the first data stream.
The method according to claim 3 or 4, wherein before the network device sends the first DCI and the second DCI to the first terminal device, the method further comprises:

The network device determines a second data flow that interferes with the first data flow.
A communication device, comprising a processing unit and a transceiver unit;

The transceiver unit is configured to receive a first DCI and a second DCI, the first DCI is used to schedule the first data stream of the first terminal device, and the second DCI is used to schedule the second data of the second terminal device stream, the second data stream interferes with the first data stream;

The processing unit is configured to demodulate the first data stream according to the first DCI and the second DCI.
The apparatus according to claim 6, wherein when the processing unit demodulates the first data stream according to the first DCI and the second DCI, the processing unit is specifically configured to perform a first downlink according to the first DCI reference signal, perform channel estimation to obtain a first channel estimation result; perform channel estimation according to the second downlink reference signal of the second DCI to obtain a second channel estimation result; according to the first channel estimation result and the first channel estimation result Two channel estimation results demodulate the first data stream.
A communication device, comprising a processing unit and a transceiver unit;

The processing unit is configured to determine a first DCI and a second DCI, where the first DCI is used to schedule the first data stream of the first terminal device, and the second DCI is used to schedule the second data of the second terminal device stream, the second data stream interferes with the first data stream;

The transceiver unit is configured to send the first DCI and the second DCI to the first terminal device; send the first data stream to the first terminal device; send the second DCI to the second terminal device data flow.
The apparatus according to claim 8, wherein the transceiver unit is further configured to send a first downlink reference signal of the first DCI and a second downlink reference signal of the second DCI; the The first downlink reference signal and the second downlink reference signal are used to demodulate the first data stream.
The apparatus according to claim 8 or 9, wherein the processing unit is further configured to, before the transceiver unit sends the first DCI and the second DCI to the first terminal device, determine whether the first data The second data stream that caused the interference.
A method for transmitting downlink control information DCI, comprising:

The first terminal device receives a first DCI and a second DCI, where the first DCI indicates a time domain resource and a frequency domain resource for transmitting retransmitted data, and the second DCI indicates a time domain resource for transmitting initially transmitted data and frequency domain resources, the time domain resources indicated by the first DCI and the time domain resources indicated by the second DCI are the same, and the frequency domain resources indicated by the first DCI and the frequency domain resources indicated by the second DCI are different ;

The first terminal device receives retransmission data on the time domain resources and frequency domain resources indicated by the first DCI, and receives initial transmission data on the time domain resources and frequency domain resources indicated by the second DCI.
A method for transmitting downlink control information DCI, comprising:

The network device sends a first DCI and a second DCI, where the first DCI indicates a time domain resource and a frequency domain resource used for transmitting retransmission data, and the second DCI indicates a time domain resource and a frequency domain resource used for transmitting the initial transmission data. domain resources, the time domain resources indicated by the first DCI and the time domain resources indicated by the second DCI are the same, and the frequency domain resources indicated by the first DCI and the frequency domain resources indicated by the second DCI are different;

The network device sends retransmission data on the time domain resources and frequency domain resources indicated by the first DCI, and sends initial transmission data on the time domain resources and frequency domain resources indicated by the second DCI.
A communication device, comprising a processing unit and a transceiver unit;

The transceiver unit is configured to receive a first DCI and a second DCI, the first DCI indicates a time domain resource and a frequency domain resource used for transmitting retransmission data, and the second DCI indicates a time domain resource used for transmitting initial transmission data. Time domain resources and frequency domain resources, the time domain resources indicated by the first DCI and the time domain resources indicated by the second DCI are the same, and the frequency domain resources indicated by the first DCI and the frequency domain indicated by the second DCI are the same. The domain resources are different; the retransmission data is received on the time domain resources and frequency domain resources indicated by the first DCI, and the initial transmission data is received on the time domain resources and frequency domain resources indicated by the second DCI;

The processing unit is configured to determine retransmission data and initial transmission data.
A communication device, comprising a processing unit and a transceiver unit;

The processing unit is configured to determine a first DCI and a second DCI, where the first DCI indicates a time domain resource and a frequency domain resource for transmitting retransmission data, and the second DCI indicates a Time domain resources and frequency domain resources, the time domain resources indicated by the first DCI and the time domain resources indicated by the second DCI are the same, and the frequency domain resources indicated by the first DCI and the frequency domain indicated by the second DCI are the same. Domain resources are different;

The transceiver unit is configured to send the first DCI and the second DCI; send retransmission data on the time domain resources and frequency domain resources indicated by the first DCI, and send retransmission data on the time domain resources and the frequency domain resources indicated by the second DCI. On the frequency domain resource, the initial transmission data is sent.
A method for transmitting downlink control information DCI, comprising:

The network device sends a first DCI and a second DCI to the terminal device, the first DCI indicates a time slot and a first subband for transmitting data, and the second DCI indicates a time slot and a second subband for transmitting data band, the time slots indicated by the first DCI and the second DCI are the same, and the first subband and the second subband are different;

The network device sends first data on the first subband and sends second data on the second subband.
16. The method of claim 15, wherein the first subband and the second subband suffer from different degrees of interference.
A communication device, comprising a processing unit and a transceiver unit;

The processing unit is configured to determine a first DCI and a second DCI, where the first DCI indicates a time slot and a first subband for transmitting data, and the second DCI indicates a time slot and a first subband for transmitting data; Two subbands, the time slots indicated by the first DCI and the second DCI are the same, and the first subband and the second subband are different;

The transceiver unit is configured to send the first DCI and the second DCI; send the first data on the first subband, and send the second data on the second subband.
18. The apparatus of claim 17, wherein the first subband and the second subband suffer from different degrees of interference.
A communication device, comprising a processor and a memory, the processor being coupled to the memory;

memory for storing computer programs;

A processor for executing a computer program stored in the memory, so that the apparatus performs the method according to any one of claims 1-2, or performs the method according to any one of claims 3-5 , or perform the method as claimed in claim 11 , or perform the method as claimed in claim 12 , or perform the method as claimed in any one of claims 15-16.
A computer-readable storage medium, characterized in that it includes a program or an instruction, and when the program or instruction is run on a computer, the method according to any one of claims 1-2 is executed, or the method as claimed in claim 3 is executed. -5 The method according to any one of the claims is carried out, or the method according to claim 11 is carried out, or the method according to claim 12 is carried out, or the method according to any one of claims 15-16 is carried out be executed.
A computer program product, characterized in that it includes a program or an instruction, and when the program or instruction is run on a computer, the method according to any one of claims 1-2 is executed, or the method according to claim 3-5 is executed. The method of any one is carried out, or the method of claim 11 is carried out, or the method of claim 12 is carried out, or the method of any one of claims 15-16 is carried out .
A chip, characterized in that the chip is coupled to a memory, and is used to read and execute program instructions stored in the memory, so as to execute the method according to any one of claims 1-2, or to execute the method according to claim 1. The method according to any one of claims 3-5, or the method according to claim 11, or the method according to claim 12, or the method according to any one of claims 15-16 is executed.
A communication system, characterized by comprising a first terminal device that executes the method according to any one of claims 1-2, and a network device that executes the method according to any one of claims 3-5.
A communication system, characterized by comprising a first terminal device that executes the method of claim 11 , and a network device that executes the method of claim 12 .
A communication system, characterized by comprising a terminal device, and a network device executing the method according to any one of claims 15-16.