WO2020156174A1

WO2020156174A1 - Beam indication method and communication apparatus

Info

Publication number: WO2020156174A1
Application number: PCT/CN2020/072221
Authority: WO
Inventors: 管鹏; 樊波; 张希
Original assignee: 华为技术有限公司
Priority date: 2019-01-31
Filing date: 2020-01-15
Publication date: 2020-08-06
Also published as: CN111510267B; CN111510267A

Abstract

The present application provides a beam indication method, comprising: a network device sends configuration information to a terminal device, the configuration information indicating using a receiving beam of an aperiodic channel state information-reference signal (CSI-RS) as a receiving beam of a data channel; the network device transmits first downlink control information (DCI) to the terminal device, the first DCI being used for indicating the receiving beam of the aperiodic CSI-RS; and the network device transmits second DCI to the terminal device, the second DCI being used for indicating the receiving beam of the aperiodic CSI-RS; wherein a time interval between the first DCI and the second DCI is not less than an aperiodic CSI-RS beam switching timing. Because a time interval between two transmissions of the DCI by the network device is greater than or equal to beam switching capability of a capability limited terminal, it is ensured that the terminal device successfully switches the receiving beam, and subsequent communications are guaranteed.

Description

Method and communication device for beam indication

Technical field

This application relates to the field of wireless communication, and more specifically, to a method and communication device for beam indication.

Background technique

In order to meet the large-capacity and high-speed transmission requirements of mobile communication systems, the 5th generation (5G) mobile communication system (5th generation, 5G) introduces high-frequency frequency bands greater than 6GHz for communication to take advantage of its large bandwidth and high-speed transmission characteristics; One or more uplink and downlink beams can be used to communicate between the device and the terminal device to form different beam pairs.

The number of active beams supported by different terminal devices is different. Some terminal devices may only support one active receiving beam. At this time, if the terminal device receives frequent beam switching instructions issued by the network device, for example: DCI( The downlink control information (downlink control information)-level beam switching instructions, due to the limited capabilities of the terminal equipment, affect the communication with the network equipment after the switching.

Summary of the invention

The present application provides a beam indication method and communication device, which can prevent the terminal device from being unable to communicate normally with the network device after beam switching.

In the first aspect, a beam indication method is provided, including:

The network device sends configuration information to the terminal device, and the configuration information indicates that the receiving beam of the aperiodic channel state information reference signal (channel state information-reference signal, CSI-RS) is used as the receiving beam of the data channel; The first downlink control information DCI issued by the terminal device, the first DCI is used to indicate the aperiodic CSI-RS receiving beam; the second DCI issued by the network device to the terminal device, the second DCI is used to indicate Aperiodic CSI-RS receiving beam; where: the time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching timing, abbreviated as: A-CSI-RS ( Or AP CSI-RS) beam switching timing).

The terminal device receives the configuration information issued by the network device, where the configuration information indicates that the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the receiving beam of the data channel; the terminal device receives the first downlink control issued by the network device Information DCI, the first DCI is used to indicate the aperiodic CSI-RS receiving beam; the terminal device receives the second DCI issued by the network device, and the second DCI is used to indicate the aperiodic CSI-RS receiving beam; if The time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching timing (A-CSI-RS beam switching timing), and the terminal device uses the receiving beam indicated by the second DCI to receive the information issued by the network device Data channel; or if the time interval between the first DCI and the second DCI is less than the A-CSI-RS beam switching timing, the terminal device abandons using the receiving beam indicated by the second DCI.

The above describes the solutions from the perspective of network equipment and terminal equipment.

In combination with the above solution, if the time interval between the first DCI and the second DCI is less than the A-CSI-RS beam switching timing, the method further includes: the terminal device uses the receiving beam indicated by the first DCI to receive the data channel issued by the network device , Or the terminal device uses the most recently instructed or used receiving beam to receive the data channel issued by the network device.

Since the time interval between the two DCI issuances by the network equipment is greater than or equal to the beam switching capability of the limited-capability terminal, the terminal equipment is guaranteed to switch the receiving beam smoothly, and the subsequent communication between the network equipment and the terminal equipment is guaranteed; The time interval for sending DCI is less than the beam switching capability of the terminal device with limited capacity, and the previously used or instructed receiving beam is used to communicate with the network device, which ensures the communication between the network device and the terminal device.

In the second aspect, a beam indication method is provided, including:

The terminal device receives the configuration information issued by the network device, the configuration information indicates that the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the data channel receiving beam; the terminal device receives the downlink control information DCI issued by the network device, so The DCI is used to indicate the receiving beam of the aperiodic CSI-RS; within a preset time period after the start of the DCI, the terminal device uses the receiving beam that was instructed or used last time before the DCI to receive the data channel issued by the network device; Or after a preset time period after the start of the DCI, the terminal device uses the receiving beam indicated by the DCI to receive the data channel issued by the network device; wherein the preset time period is not less than the aperiodic CSI-RS beam switching time (A-CSI-RS beam switching timing).

In the above solution, the preset time period is the time interval from when the network device issues an instruction for changing the receiving beam of the aperiodic CSI-RS to the terminal device using the receiving beam to receive the data channel.

Since the above-mentioned preset time period is set, and the DCI is issued to within or outside the preset time period, the terminal equipment uses different receiving beams to receive the data channels issued by the network equipment, which ensures the smooth switching of the beams on the one hand, and on the other On the one hand, it ensures the communication between network equipment and terminal equipment.

In each of the above solutions, the terminal device only supports one activated receive beam, that is, the terminal device only supports one activated transmission configuration index (TCI), for example: activated PDSCH TCI. It should be noted that if the terminal device supports multiple activated receive beams, that is, supports multiple activated TCIs, the above solution is also applicable.

Each of the above schemes is described as an example of the following data transmission. The network device sends data to the terminal device. Therefore, in each of the above schemes, the data channel is a downlink data channel, for example: physical downlink shared channel (PDSCH) ).

Each of the above schemes will be described as an example of downstream data transmission, and each of the following schemes will be described as an example of upstream data transmission, that is, a terminal device sends uplink data to a network device. Therefore, in each of the following schemes, the data channel is an uplink data channel. For example: physical uplink shared channel (PUSCH).

In the third aspect, a beam indication method is disclosed, including:

The network device sends configuration information to the terminal device, where the configuration information indicates that the sending beam corresponding to the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the sending beam of the uplink data channel; the first sent by the network device to the terminal device Downlink control information DCI, the first DCI is used to indicate the receiving beam of aperiodic CSI-RS; the second DCI issued by the network device to the terminal device, the second DCI is used to indicate the reception of aperiodic CSI-RS Beam; where: the time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching timing (A-CSI-RS beam switching timing).

The terminal device receives the configuration information issued by the network device, and the configuration information indicates that the transmitting beam corresponding to the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the transmitting beam of the uplink data channel; the terminal device receives the information issued by the network device First downlink control information DCI, the first DCI is used to indicate the receiving beam of aperiodic CSI-RS; the terminal device receives the second DCI issued by the network device, and the second DCI is used to indicate the aperiodic CSI-RS If the time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching time, the terminal device uses the transmission beam corresponding to the reception beam indicated by the second DCI to send the uplink data channel to the network device Or if the time interval between the first DCI and the second DCI is less than the aperiodic CSI-RS beam switching time, the terminal device gives up using the transmission beam corresponding to the reception beam indicated by the second DCI.

In combination with the above solution, if the time interval between the first DCI and the second DCI is less than the aperiodic CSI-RS beam switching time, the method further includes: the terminal device uses the transmitting beam corresponding to the receiving beam indicated by the first DCI to transmit to the network device The uplink data channel, or the terminal device uses the most recently instructed or used transmission beam to send the uplink data channel to the network device.

Since the time interval between two DCI issuances by the network device is greater than or equal to the beam switching capability of the terminal with limited capabilities, the terminal device can switch beams smoothly and the subsequent communication between the network device and the terminal device; in addition, if the DCI is issued twice The time interval of the DCI is less than the beam switching capability of the capacity-limited terminal device, and the previously used or instructed transmission beam is used to communicate with the network device.

In a fourth aspect, a beam indication method is provided, including:

The terminal device receives the configuration information issued by the network device, and the configuration information indicates that the transmitting beam corresponding to the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the transmitting beam of the uplink data channel; the terminal device receives the information issued by the network device Downlink control information DCI, where the DCI is used to indicate the receiving beam of aperiodic CSI-RS; within a preset time period after the start of the DCI, the terminal device uses the most recently indicated or used transmission beam to the network device before the DCI Sending an uplink data channel; or after a preset time period after the start of the DCI, the terminal device uses the sending beam corresponding to the receiving beam indicated by the DCI to send the uplink data channel to the network device; wherein the preset time period is not less than Aperiodic CSI-RS beam switching timing (A-CSI-RS beam switching timing).

In the above solution, the preset time period is the time interval from when the network device issues the instruction for changing the receiving beam of the aperiodic CSI-RS to the terminal device using the sending beam corresponding to the receiving beam to send the uplink data channel.

In each of the above solutions, the terminal device only supports one activated transmission beam, that is, the maximum number of activated spatial relationships supported by the terminal device is 1. It should be noted that if the terminal device supports multiple activated transmission beams, that is, the number of activated spatial relationships is multiple, the above solution is also applicable.

Since the above-mentioned preset time period is set, and different sending beams are used to send uplink data channels to the network device within or outside the preset time period from DCI delivery, on the one hand, it ensures the smooth switching of the beams, and on the other hand, it ensures Communication between network equipment and terminal equipment.

In the above-mentioned solutions from the first aspect to the fourth aspect, the DCI issued by the network device is transmitted through a downlink control channel, for example, a physical downlink control channel (PDCCH).

The aperiodic CSI-RS beam switching time is the aperiodic CSI-RS beam switching time of the terminal device, and may be a capability of the terminal device.

The configuration information indicating that the receiving beam of the aperiodic CSI-RS is used as the receiving beam of the data channel specifically indicates that the QCL (quasi colocation) of the aperiodic CSI-RS is assumed as the QCL assumption of the data channel.

The DCI mentioned in the above solutions is used to indicate the receiving beam of aperiodic CSI-RS, and its function is to notify the terminal device to change the receiving beam of aperiodic CSI-RS; the DCI is used to indicate the receiving beam of aperiodic CSI-RS The receiving beam is specifically the QCL hypothesis used by the DCI to indicate aperiodic CSI-RS.

In addition, the configuration information indicating that the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the receiving beam of the data channel may also be preset, and the network device does not need to be configured for the terminal device.

The following describes the devices corresponding to the above methods.

A communication device. The device may be a terminal device or a network device in each of the foregoing methods, or may be a chip or a functional module in the terminal device or the network device. The device has the function of realizing terminal equipment or network equipment in each of the above methods. This function can be realized by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions.

In a possible design, the device includes: a transceiver module, or called a communication module, which may include a sending module and/or a receiving module; used to implement signal transceiver functions; optionally, the device also includes a processing module, Used to implement processing functions other than signal transmission; the transceiver module may be, for example, at least one of a transceiver, a receiver, and a transmitter, and the transceiver module may include a radio frequency circuit or an antenna. The processing module may be a processor. Optionally, the device further includes a storage module, such as a memory. When a storage module is included, the storage module is used to store computer programs or instructions. The processing module is connected to the storage module, and the processing module can execute the program or instruction stored in the storage module or originate from other programs or instructions, so that the device executes any one of the methods described above.

Among them, the processor mentioned in any of the above can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more for controlling the above All aspects of communication method program execution integrated circuit.

In a fifth aspect, a computer storage medium is provided, and the computer storage medium stores a computer program, and when the computer program is executed by a computer or a processor, the method in each of the foregoing aspects is implemented.

In a sixth aspect, a computer program product containing instructions is provided, which, when running on a computer, causes the computer to execute the methods of the above aspects.

In a seventh aspect, a communication system is provided. The communication system includes the aforementioned network device and terminal device.

In an eighth aspect, a processor is provided, which is configured to be coupled with a memory and used to execute the methods of the foregoing aspects.

In a ninth aspect, a chip is provided. The chip includes a processor and a communication interface, where the communication interface is used to communicate with an external device or an internal device, and the processor is used to implement the methods of the foregoing aspects.

Optionally, the chip may further include a memory with instructions stored in the memory, and the processor is configured to execute programs or instructions stored in the memory or derived from other programs or instructions. When the program or instruction is executed, the processor is used to implement the above-mentioned methods.

Optionally, the chip can be integrated on terminal equipment or network equipment.

Description of the drawings

Fig. 1 shows a schematic diagram of a communication system according to an embodiment of the present application.

Fig. 2 shows a schematic diagram of a beam switching scenario in an embodiment of the present application.

Fig. 3 is a flowchart of a beam switching method according to an embodiment of the present application.

Fig. 4 is a flowchart of a beam switching method according to an embodiment of the present application.

Fig. 5 is a flowchart of a beam switching method according to an embodiment of the present application.

Fig. 6 is a flowchart of a beam switching method according to an embodiment of the present application.

Fig. 7 is a schematic block diagram of a communication device provided by an embodiment of the present application.

FIG. 8 is a schematic block diagram of another communication device provided by an embodiment of the present application.

FIG. 9 is a schematic block diagram of another communication device provided by an embodiment of the present application.

FIG. 10 is a schematic block diagram of still another communication device provided by an embodiment of the present application.

FIG. 11 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.

FIG. 12 is a schematic diagram of the structure of a network device provided by an embodiment of the present application.

detailed description

The technical solution in this application will be described below in conjunction with the drawings.

The embodiments of this application are applicable to beam-based multi-carrier communication systems, such as global system for mobile communications (GSM) system, code division multiple access (CDMA) system, and broadband code division multiple access (GSM) system. wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division Duplex (time division duplex, TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, the future 5th generation (5G) ) System or new radio (NR), etc.

FIG. 1 shows a schematic diagram of a communication system 100 applicable to the interference measurement method and apparatus according to the embodiments of the present application. As shown in the figure, the communication system 100 may include at least one network device, such as the network device 110 shown in FIG. 1; the communication system 100 may also include at least one terminal device, such as the terminal device 120 shown in FIG. 1. The network device 110 and the terminal device 120 may communicate through a wireless link.

Each communication device, such as the network device 110 or the terminal device 120 in FIG. 1, may be configured with multiple antennas. The plurality of antennas may include at least one transmitting antenna for transmitting signals and at least one receiving antenna for receiving signals. In addition, each communication device additionally includes a transmitter chain and a receiver chain. Those of ordinary skill in the art can understand that they can all include multiple components related to signal transmission and reception (for example, processors, modulators, multiplexers). Converter, demodulator, demultiplexer or antenna, etc.). Therefore, multiple antenna technology can be used to communicate between network devices and terminal devices.

It should be understood that the network device in the wireless communication system may be any device with a wireless transceiver function. This equipment includes but is not limited to: evolved Node B (eNB), Radio Network Controller (RNC), Node B (Node B, NB), Base Station Controller (BSC) , Base transceiver station (Base Transceiver Station, BTS), home base station (for example, Home evolved NodeB, or Home Node B, HNB), baseband unit (BaseBand Unit, BBU), wireless fidelity (Wireless Fidelity, WIFI) system Access point (Access Point, AP), wireless relay node, wireless backhaul node, transmission point (transmission point, TP) or transmission and reception point (transmission and reception point, TRP), etc., can also be 5G, such as NR , The gNodeB (gNB, base station) in the system, or the transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of the base station in the 5G system, or it can also form a gNB or transmission The network node of the point, such as a baseband unit (BBU), or a distributed unit (DU), etc.

In some deployments, the gNB may include a centralized unit (CU) and a DU. The gNB may also include a radio unit (RU). CU realizes some functions of gNB, DU realizes some functions of gNB, for example, CU realizes radio resource control (radio resource control, RRC), packet data convergence protocol (packet data convergence protocol, PDCP) layer functions, DU realizes wireless link The functions of the radio link control (RLC) layer, media access control (MAC) layer and physical (PHY) layer. Since the information of the RRC layer will eventually become the information of the PHY layer, or be transformed from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by DU , Or, sent by DU+CU. It can be understood that the network device may be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, the CU can be divided into network equipment in an access network (radio access network, RAN), or the CU can be divided into network equipment in a core network (core network, CN), which is not limited in this application.

It should also be understood that the terminal equipment in the wireless communication system may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, User terminal, terminal, wireless communication device, user agent or user device. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiver function, a virtual reality (VR) terminal device, and an augmented reality (AR) terminal Equipment, wireless terminals in industrial control, wireless terminals in unmanned driving (self-driving), wireless terminals in remote medical, wireless terminals in smart grid, transportation safety ( Wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes. The embodiment of this application does not limit the application scenario.

In order to facilitate the understanding of the embodiments of the present application, the following first briefly introduces several terms involved in the present application.

1. Beam

One of the main problems of high frequency communication is that the signal energy drops sharply with the transmission distance, resulting in a short signal transmission distance. In order to overcome this problem, high-frequency communication adopts analog beam technology, and performs weighting processing through a large-scale antenna array to concentrate the signal energy in a small range to form a signal similar to a beam (called analog beam, or beam for short) ) To increase the transmission distance.

The beam is a communication resource. The beam can be a wide beam, or a narrow beam, or other types of beams. The beam forming technology may be beamforming technology or other technical means. The beamforming technology may specifically be a digital beamforming technology, an analog beamforming technology, and a hybrid digital/analog beamforming technology. Different beams can be considered as different resources. The same information or different information can be sent through different beams. Optionally, multiple beams with the same or similar communication characteristics may be regarded as one beam. A beam can be formed by one or more antenna ports, used to transmit data channels, control channels, and sounding signals. One or more antenna ports forming a beam can be regarded as an antenna port set.

The beam includes a transmitting beam and a receiving beam. The transmit beam may refer to the distribution of signal strength formed in different directions in space after a signal is transmitted through the antenna, and the receive beam may refer to the distribution of the antenna array to strengthen or weaken the reception of wireless signals in different directions in space.

In the current NR protocol, beam information can be indicated through the antenna port quasi colocation (QCL) relationship. Specifically, the indication information (for example, downlink control information (DCI)) may indicate that one resource (or antenna port) and another resource (or antenna port) have a quasi co-location relationship to indicate that the two The beams corresponding to each resource (or antenna port) have the same spatial characteristics, and the same receiving beam can be used for reception. The beam can be specifically represented by various signal identifiers in the protocol, such as the resource index of the channel state information reference signal (CSI-RS), and the synchronous signal broadcast channel block (synchronous signal/physical broadcast channel). A block may be referred to as SS/PBCH block or SSB for short) index, sounding reference signal (SRS) resource index, and tracking reference signal (tracking reference signal, TRS) resource index.

In addition, in general, a beam and a demodulation reference signal (DMRS) port/port group or a transmission configuration index (TCI) or a TRP or a sounding reference signal resource indicator ( SRS resource indicator, SRI for short) (used for uplink data transmission) corresponds. Therefore, different beams can also be represented by different DMRS ports/port groups or TCI or TRP or SRI.

Because DMRS port/port group, TCI, TRP, SRI, CSI-RS resource index, SS/PBCH block index, SRS resource index, and TRS resource index can all represent beams. Therefore, the DMRS port/port group and TCI below can also be replaced with beam, TRP, SRI, CSI-RS resource index, SS/PBCH block index, SRS resource index, or TRS resource index, and the replacement is not Change the essence of the method provided in the embodiment of this application.

2. Channel state information acquisition (CSI acquisition): including acquisition of reference signal received power (Reference Signal Received Power, RSRP), reference signal received quality (Reference Signal Received Quality, RSRQ), channel quality indicator (channel-quality indicator, CQI) , Rank indicator (rank indicator, RI), precoding matrix indicator (precoding-matrix indicator, PMI), signal to interference plus noise ratio (SINR), etc.

3. Time domain attributes: In interference measurement resource configuration and interference measurement report configuration, different time domain attributes can be used to indicate different time domain behaviors. Among them, the time-domain attribute of the interference resource configuration can be used to indicate the time-domain behavior of the terminal device receiving the interference signal; the time-domain attribute of the measurement report configuration can be used to indicate the time-domain behavior of the terminal device to report the interference measurement result.

As an example and not a limitation, the time-domain attribute may include periodic, semi-persistent, and aperiodic, for example.

It should be understood that the embodiment of the beam in the NR protocol listed above is only an example, and should not constitute any limitation to this application. This application does not exclude the possibility of defining other terms to represent the same or similar meanings in future agreements.

4. Quasi-co-location (QCL): or quasi-co-location. The QCL relationship is used to indicate that multiple resources have one or more identical or similar communication characteristics. For multiple resources with a co-location relationship, the same or similar communication configuration can be used. For example, if two antenna ports have a QCL relationship, then the large-scale characteristics of the channel transmitting one symbol on one port can be inferred from the large-scale characteristics of the channel transmitting one symbol on the other port. The reference signals corresponding to the antenna ports with the QCL relationship have the same parameters, or the parameters of one antenna port can be used to determine the parameters of the other antenna port that has the QCL relationship with the antenna port, or the two antenna ports have the same parameters , Or, the parameter difference between the two antenna ports is less than a certain threshold. The parameters may include one or more of the following: delay spread, Doppler spread, Doppler shift, average delay, average Gain, spatial reception parameters (spatial Rx parameters). Among them, the spatial reception parameters may include one or more of the following: angle of arrival (angle of arrival, AOA), average AOA, AOA extension, angle of departure (angle of departure, AOD), average departure angle AOD, AOD extension, reception Antenna spatial correlation parameters, transmit antenna spatial correlation parameters, transmit beam, receive beam, and resource identification.

Wherein, the above-mentioned angles may be decomposition values of different dimensions, or a combination of decomposition values of different dimensions. Antenna ports are antenna ports with different antenna port numbers, and/or antenna ports with the same antenna port number for information transmission or reception in different time and/or frequency and/or code domain resources, and/or, have different Antenna port number The antenna port for information transmission or reception in different time and/or frequency and/or code domain resources. The resource identifier may include: CSI-RS resource identifier, or SRS resource identifier, or SSB resource identifier, or the resource identifier of the preamble sequence transmitted on the Physical Random Access Channel (PRACH), or the demodulation reference signal ( The resource identifier of demodulation reference signal (DMRS) is used to indicate the beam on the resource.

In the NR protocol, QCL relationships can be divided into the following four types based on different parameters:

Type A (type A): Doppler frequency shift, Doppler spread, average delay, and delay spread;

Type B (type B): Doppler frequency shift, Doppler spread;

Type C (type C): Doppler frequency shift, average delay; and

Type D (type D): Space receiving parameters.

The QCL involved in the embodiment of the present application is a type D QCL. In the following, unless otherwise specified, QCL can be understood as QCL of type D, that is, QCL defined based on spatial reception parameters, referred to as spatial QCL.

When the QCL relationship refers to the QCL relationship of type D, it can be considered as spatial QCL (spatial QCL). When the antenna port meets the spatial QCL relationship, the QCL relationship between the downlink signal port and the downlink signal port, or between the uplink signal port and the uplink signal port, can be that the two signals have the same AOA or AOD. Yu means the same receiving beam or transmitting beam. For another example, the QCL relationship between the downlink signal and the uplink signal or between the uplink signal and the downlink signal port can be that the AOA and AOD of the two signals have a corresponding relationship, or the AOD and AOA of the two signals have a corresponding relationship, that is, the beam can be used Reciprocity: Determine the uplink transmit beam according to the downlink receive beam, or determine the downlink receive beam according to the uplink transmit beam.

From the perspective of the transmitting end, if the two antenna ports are spatial QCL, it may mean that the corresponding beam directions of the two antenna ports are spatially consistent. From the perspective of the receiving end, if the two antenna ports are spatial QCL, it can mean that the receiving end can receive the signals sent by the two antenna ports in the same beam direction.

The signal transmitted on the port with the spatial QCL relationship may also have a corresponding beam, and the corresponding beam includes at least one of the following: the same receiving beam, the same transmitting beam, and the transmitting beam corresponding to the receiving beam (corresponding to the reciprocal Scene), the receiving beam corresponding to the transmitting beam (corresponding to the scene with reciprocity).

The signal transmitted on the port with the spatial QCL relationship can also be understood as using the same spatial filter to receive or transmit the signal. The spatial filter may be at least one of the following: precoding, weight of the antenna port, phase deflection of the antenna port, and amplitude gain of the antenna port.

The signal transmitted on the port with the spatial QCL relationship can also be understood as having a corresponding beam pair link (BPL), and the corresponding BPL includes at least one of the following: the same downlink BPL, the same uplink BPL, and the downlink BPL The corresponding uplink BPL, the downlink BPL corresponding to the uplink BPL.

Therefore, the spatial reception parameter (ie, QCL of type D) can be understood as a parameter for indicating the direction information of the reception beam.

5. QCL indication and QCL assumption

The introduction of QCL has stated that if two antenna ports have a quasi-co-location relationship, then the large-scale characteristics of the channel transmitting one symbol on one port can be inferred from the large-scale characteristics of the channel transmitting one symbol on the other port. Therefore, when the base station indicates that there is a QCL relationship between two ports, the terminal should assume that the large-scale characteristics of the channel for transmitting one symbol on the two ports are consistent. For example, the large-scale characteristics of the channel for transmitting one symbol on one port are known, and the same assumption can be adopted for the large-scale characteristics of the channel for transmitting one symbol on the other port.

6. Transmission configuration indicator (TCI) state: it can be used to indicate the QCL relationship between two reference signals. Each TCI state may include a serving cell index (ServeCellIndex), a bandwidth part (bandwidth part, BWP) identifier (ID), and a reference signal resource identifier, where the reference signal resource identifier may be, for example, at least one of the following: Non-zero power (NZP) CSI-RS reference signal resource identifier (NZP-CSI-RS-ResourceId), non-zero power CSI-RS reference signal resource set identifier (NZP-CSI-RS-ResourceSetId) or SSB Index (SSB-Index).

The definition of TCI in 3GPP is: Indicating a transmission configuration which includes QCL-relationships between the DL RSs in one RS set and the PDSCH DMRS ports.

The Chinese translation is as follows: indicates the transmission configuration, including the QCL relationship between the downlink signal [port] and the PDSCH DMRS port in a reference signal set.

TCI can be used to indicate physical downlink control channel (physical downlink control channel, PDCCH for short)/physical downlink shared channel (physical downlink shared channel, for short PDSCH) QCL information, specifically it can be used to indicate which reference signal the DMRS of PDCCH/PDSCH and which reference signal If the QCL relationship is satisfied, the terminal can receive the PDCCH/PDSCH by using the same or similar spatial parameters (for example, receiving beams) as the spatial parameters of the reference signal.

In the TCI, the reference signal index may be used to indicate which reference signal the DMRS of the PDCCH/PDSCH satisfies the QCL relationship with.

Referring to FIG. 2, a base station (e.g., gNB) can configure multiple aperiodic CSI-RS receive beams (ie, multiple QCL assumptions of aperiodic CSI-RS) for a terminal (e.g. UE), and activate one of the receive beams (That is, a QCL assumption) is used as the current aperiodic CSI-RS receiving beam (QCL assumption). The base station may also configure the receiving beam of the aperiodic CSI-RS as the receiving beam of the data channel (for example: PDSCH) by configuring the TCI, and activate the receiving beam (that is, activating the TCI). The terminal uses the aperiodic CSI-RS receiving beam to receive the data channel (PDSCH) issued by the base station.

Further, the base station can issue DCI to the terminal through the control channel (for example: PDCCH) to notify the terminal to change the aperiodic CSI-RS receiving beam (that is, to change the QCL assumption of the aperiodic CSI-RS), and then the terminal uses the changed receiving beam The aperiodic CSI-RS issued by the base station is received, and then the terminal performs aperiodic CSI-RS measurement and reports.

There is a time interval between the DCI issued by the base station instructing the terminal to change the receiving beam of the aperiodic CSI-RS and the base station issuing the aperiodic CSI-RS (that is, the time interval between the DCI indication in Figure 2 and the AP CSI-RS transmission). During this time interval, if the base station again instructs the terminal to change the receiving beam of aperiodic CSI-RS through DCI, if the terminal is a terminal with limited capabilities and only supports one active receiving beam (that is, an active TCI), it cannot After changing the receiving beam or changing the receiving beam, the data channel cannot be received.

Therefore, when a terminal with limited capability reports to the base station that it supports one active TCI (that is, only supports one active receiving beam), it does not expect to receive too dynamic (that is, DCI level) beam switching instructions. If the active TCI (active TCI) reference signal configured by the base station is an aperiodic CSI-RS, the aperiodic CSI-RS used as the reference signal can itself be dynamically switched by DCI. This will cause the data channel (for example: PDSCH) to have only one active TCI (that is, one active receiving beam), but the actual receiving beam is still dynamically switched, which exceeds the capability range of this type of terminal, causing conflicts.

The beam indication method in the embodiment of the present application is to resolve the aforementioned conflicts and ensure normal communication between the terminal and the base station.

Referring to Figure 3, the method includes:

201: Terminal capability report.

The terminal reports the number of dynamic receive beams it supports to the base station. For example, the maximum number of active TCIs supported is 1, that is, one dynamic receive beam is supported.

The terminal capability report in 3GPP R15 has the following content:

1. The maximum number of activated TCIs supported, with values such as {1,2,4,8}, etc. The number of activated TCIs is also the number of dynamic receive beams supported by the terminal. The definition in the NR agreement is as follows:

maxNumberActiveTCI-PerBWP

Defines maximum number of TCI states for PDSCH reception that can be activated for the UE using MAC Control Element from the set of RRC configured TCI states as defined in TS 38.214 clause 5.1.5.

The Chinese translation is as follows: The maximum number of activated TCIs per BWP defines the maximum TCI that can be activated for the terminal from the TCI state configured by the RRC for PDSCH reception using the Medium Access Control Control Element (MAC-CE) number.

It can be seen from this capability that a terminal with limited capability can report to support one active PDSCH TCI, that is, one active PDSCH receive beam. Therefore, such terminals do not want to support too dynamic (DCI-level) PDSCH beam switching, and such terminals do not want to track multiple beams at the same time.

The solutions of the various embodiments of the present application are proposed for terminals with limited capabilities, but if the terminal capabilities are not limited, for example, if the terminal supports multiple TCIs, the methods in each embodiment are also applicable.

2. When the TCI of the terminal is 1, an additional TCI dedicated to control is supported, that is, an additional beam used to transmit a control channel (for example: PDCCH) is supported to receive the DCI issued by the base station. The definition in the NR agreement is as follows:

additionalActiveTCI-StatePDCCH

Indicates whether the UE supports one additional active TCI-State for control in addition to the supported number of active TCI-States for PDSCH. The UE can include this field only if maxNumberConfigured TCIstatesPerCC in tci-wiseset the UE to PD.Otherwise not include this field.

The Chinese translation is as follows: The additional control channel activates the TCI state, which defines whether the terminal supports an additional activated TCI state for control in addition to the supported active TCI state for PDSCH. The terminal can only report this capability field when it reports maxNumberConfiguredTCIstatesPerCC as 1. Otherwise, the UE does not report this capability field.

3. A-CSI-RS beam switching timing: the beam switching time of aperiodic CSI-RS, that is, the time interval from DCI indication to aperiodic CSI-RS (AP CSI-RS) transmission (refer to Figure 2), the value is { 14,28,48,224,336...} etc. OFDM symbol time. The definition in the NR agreement is as follows:

beamSwitchTiming

Indicates the minimum number of OFDM symbols between the DCI triggering of aperiodic CSI-RS and aperiodic CSI-RS transmission. The number of OFDM symbols is measured from the last symbols included the indication of the first CSI-included the CSI-RS. field for each supported sub-carrier spacing.

The Chinese translation is as follows: Beam switching time refers to the minimum number of OFDM symbols between DCI triggering aperiodic CSI-RS and aperiodic CSI-RS transmission. The number of OFDM symbols refers to the number of OFDM symbols between the last symbol including DCI and the first symbol including CSI-RS. The terminal shall report this capability field for each subcarrier interval supported.

4. Beam reporting timing: beam reporting time, that is, the time interval from aperiodic CSI-RS transmission to CSI reporting (refer to Figure 2), the value is {14,28...} and other OFDM symbol times. The reporting of aperiodic CSI can be performed through a physical uplink shared channel (PUSCH). The definition in the NR agreement is as follows:

beamReportTiming

Indicates the number of OFDM symbols between the last symbol of SSB/CSI-RS and the first symbol of the transmission channel containing beam report. The UE includes this field for each supported sub-carrier spacing.

The Chinese translation is as follows: Beam reporting time refers to the number of OFDM symbols between the last symbol containing SSB/CSI-RS and the first symbol containing beam reporting. The terminal shall report this capability field for each subcarrier interval supported.

5. DCI indicates the time interval to PDSCH transmission, the value is {14,28,...} etc. OFDM symbol time. The definition in the NR agreement is as follows:

timeDurationForQCL

Defines minimum number of OFDM symbols required by the UE to perform PDCCH reception and applying spatial QCL information received in DCI for PDSCH processing as described in TS 38.214 clause-in the minimum-Threuse- Offset. number of OFDM symbols per each subcarrier spacing of 60kHz and 120kHz.

The Chinese translation is as follows: QCL time interval defines the minimum number of OFDM symbols required by the terminal for PDCCH reception and application of the spatial QCL information carried by the DCI in the PDCCH for PDSCH reception. The terminal shall report this capability field for each subcarrier interval supported.

202: The base station issues configuration information, and the terminal receives the configuration information issued by the base station.

The configuration information indicates that the terminal aperiodic CSI-RS receiving beam is configured as the receiving beam of the data channel.

Specifically, the content of the base station configuration includes:

The content configured through RRC (radio resource control, radio resource control) includes:

1. A list of available TCI states for PDSCH, where at least one TCI reference signal is aperiodic CSI-RS (aperiodic CSI-RS, abbreviation: AP CSI-RS or A-CSI-RS), that is, there is at least one beam The reference signal of is AP CSI-RS; that is, the receiving beam of AP CSI-RS is configured as the receiving beam of the data channel (ie, PDSCH).

2. Trigger state of aperiodic CSI-RS

Each trigger state can be configured with different receiving beams for aperiodic CSI-RS resources. In the 3GPP protocol, each trigger state is implemented by configuring different QCL lists for aperiodic CSI-RS resource sets in the form of TCI.

The content of MAC-CE activation includes:

1. There is only one active TCI for PDSCH, that is, there is one active TCI for PDSCH, and the reference signal for active TCI is aperiodic CSI-RS. It should be noted that if there are multiple PDSCH activation beams, this solution is also applicable to the aperiodic CSI-RS as the reference signal of the TCI in the activated TCI.

2. Aperiodic CSI-RS activation trigger states, which can activate a maximum of 64 trigger states.

The base station can select one of the 64 beams for the terminal as the current aperiodic CSI-RS receiving beam through DCI.

203: The base station dynamically changes the receiving beam of the aperiodic CSI-RS through the DCI.

The base station dynamically indicates the QCL hypothesis of aperiodic CSI-RS through DCI, that is, indicates the receiving beam of aperiodic CSI-RS. The DCI sent by the base station (usually the CSI request field) carries a selected aperiodic CSI-RS trigger state, notifying the terminal device that the receiving beam of the aperiodic CSI-RS has changed. The DCI is issued through the downlink control channel (for example: PDCCH).

After receiving the DCI, the terminal adopts the changed receiving beam (ie, QCL assumption) to receive the CSI-RS and/or PDSCH issued by the base station.

Before 203, the base station and the terminal can communicate normally, which is not concerned in this application.

204: The base station sends the CSI-RS, and the terminal measures the CSI-RS and reports the measurement result.

The terminal determines the modified aperiodic CSI-RS receiving beam according to the instruction of 203, receives the CSI-RS sent by the base station through the beam, and reports the measurement result (CSI). Further, the terminal can re-determine the receiving beam according to the measurement result (ie, QCL assumption), and the base station can also re-determine the receiving beam of the terminal according to the reported measurement result; or determine that the original receiving beam is still used according to the measurement result.

This step is optional.

205: The base station sends DCI to schedule the PDSCH, and the terminal receives the PDSCH issued by the base station.

In the applicable scenario of this application, the TCI reference signal indicated by the TCI field in the DCI is the aperiodic CSI-RS in the 203/204 step.

If you execute 205 directly after 203, since in 203, the aperiodic CSI-RS receiving beam (ie QCL assumption) has been changed, correspondingly, the QCL assumption (ie PDSCH receiving beam) indicated by the TCI of PDSCH should also be corresponding Changes. The terminal uses the aperiodic CSI-RS reception beam indicated by 203 (that is, QCL assumption) to receive the PDSCH.

Optionally, if step 204 occurs before step 205, the terminal uses the QCL assumption (that is, the receiving beam) determined in step 204 to receive the PDSCH. This is because aperiodic CSI-RS measurement may be used for receive beam training, so the optimal receive beam of the aperiodic CSI-RS in step 204 may have been updated, and of course, the optimal beam may not change.

The DCI in 205 and 203 should usually be different DCI.

206: The base station dynamically changes the receiving beam of the aperiodic CSI-RS through DCI again (that is, instructs the terminal to change the QCL hypothesis by issuing DCI). The instruction method is similar to that of 203, and the description of 203 can be referred to.

Referring to FIG. 2, the time interval between steps 203 and 206 is the time interval from DCI indication to aperiodic CSI-RS (AP CSI-RS) transmission, that is, capability 3 reported by the terminal in 201.

The time interval between the two times that the base station issues instructions for changing the received beam of aperiodic CSI-RS (that is, the DCI in 203 and the DCI in 206) must be greater than or equal to the preset time interval, that is, between 203 and 206 The time interval between the two DCIs is not less than the preset time interval; the two DCIs respectively indicate different receiving beams of the same aperiodic CSI-RS for the terminal.

For example: the time between two DCI triggers of aperiodic CSI-RS is not less than X.

X may be defined in advance by the standard or configured by the base station to the terminal, and the unit may be slot.

If X is configured by the base station, it can be reflected in step 202; that is, adding X in the configuration information is used to limit the time interval between two DCIs not less than X.

In addition, X satisfies the beam switching capability (A-CSI-RS beam switching timing) reported by the terminal, and the optional value is {14,28,48,224,336} and other OFDM symbol time.

If X is the terminal capability, it should also be reflected in step 201, that is, in step 201, the terminal reporting capability includes X, which is used to limit the time interval between two DCIs to not less than X.

X may be a newly added terminal capability, which is used by the terminal to instruct the base station to issue the minimum time interval between two instructions for changing the received beam of the aperiodic CSI-RS. In one embodiment, the terminal reports the above-mentioned capability X to the base station. After the base station receives the capability reported by the terminal, the time interval between two DCI issuances can be not less than X.

X can also reuse the value of the existing terminal capability. For example, in step 201, the capabilities reported by the terminal include 3 and 4, and the value of X can be 3 or 3+4. In other words, the time interval between two QCL indications issued by the base station for changing aperiodic CSI-RS must be greater than or equal to A-CSI-RS beam switching timing, or greater than or equal to A-CSI-RS beam switching timing+Beam reporting timing.

In addition, if the time interval between two DCI issuances by the base station is less than X, after receiving the second DCI (DCI in step 206), the terminal determines that the time interval between steps 203 and 206 is less than X, and then abandons use The receiving beam indicated by 206 receives the PDSCH; that is to say, the subsequent terminal still receives the PDSCH according to the QCL hypothesis (receiving beam) indicated by 203 or 204; or, the most recent indication (non-206 DCI indication) or the used reception Beam (or QCL hypothesis) to receive PDSCH, such as the receiving beam used before 203 to communicate with the base station. The communication content includes: receiving PDSCH, receiving PDCCH, sending physical uplink shared channel (PUSCH), sending physical uplink control channel (PUCCH), etc. That is, sending/receiving data or signaling.

204, 205, 206 have no time sequence, 204 is optional. The steps after 206 are to repeat 204-205 until the terminal receives the PDSCH.

207: The base station sends CSI-RS, and the terminal measures and reports the measurement result.

208: The base station sends DCI to schedule the PDSCH, and the terminal receives the PDSCH.

Steps 207-208 are repeated 204-205.

In the foregoing embodiment, if it is satisfied that "the time interval between steps 203 and 206 is not less than X (that is, the minimum time interval between the two times the base station issues instructions for changing the received beam of aperiodic CSI-RS)" Condition, the terminal receives the PDSCH according to the QCL hypothesis indicated in 206. If it is not met, the terminal abandons the QCL hypothesis in step 206 and still follows the QCL hypothesis indicated in 203 or 204, or uses the most recently indicated or used QCL hypothesis ( The receiving beam) receives the PDSCH, which avoids the failure of the terminal beam switching and the inability to communicate with the base station normally.

Optionally, in steps 205 and 208, whether the terminal adopts the QCL hypothesis indicated in the DCI to receive the PDSCH also depends on the time interval between the DCI and the PDSCH. If the time interval between DCI and PDSCH is greater than or equal to the capability 5 reported by the terminal in 201, the terminal can use the QCL hypothesis indicated in the DCI to receive PDSCH. If the time interval between DCI and PDSCH is less than that reported by the terminal in 201 Capability 5, the terminal uses the same QCL assumption as the PDCCH to receive the PDSCH, that is, the terminal uses the same receiving beam as the PDCCH to receive the PDSCH.

In the above-mentioned embodiment, the time interval X is set to instruct the base station to issue the minimum time interval between two indications for changing the received beam of the aperiodic CSI-RS, and the time interval between the two DCIs is compared with X for comparison. The results are processed in different ways; in another embodiment, another time interval Y can be set. Referring to Fig. 4, another example of the beam indication method is as follows:

301: Terminal capability feedback.

Same as 201, please refer to 201.

302: The base station issues the configuration, and the terminal receives the base station configuration.

Same as 202.

303: The base station dynamically changes the receiving beam of the aperiodic CSI-RS through the DCI.

Same as 203.

Before 303, the base station and the terminal can communicate normally, which is not of interest in this application.

304: The base station sends the CSI-RS, and the terminal measures and reports the measurement result.

This step is optional and the same as 204.

305: The base station sends DCI to schedule the PDSCH, and the terminal receives the PDSCH issued by the base station.

In the applicable scenario of this application, the reference signal in the TCI indicated by the TCI field in the DCI is the aperiodic CSI-RS in step 303/304.

The DCI in 303 and 305 are usually different DCIs.

Although in 303, the QCL assumption (that is, the receiving beam) of the aperiodic CSI-RS has been changed, because the CSI-RS may not have been transmitted yet, the terminal has not yet measured the latest aperiodic CSI-RS, and has not yet determined a new one. Therefore, the QCL assumption (that is, the receiving beam) of the terminal receiving PDSCH can be unchanged. In other words, the beam of the terminal receiving the PDSCH remains unchanged.

This embodiment introduces time period Y. Within the start of DCI Y time (including the end time point of Y), the terminal abandons receiving the PDSCH using the receiving beam indicated by DCI in 303; the terminal can use the QCL hypothesis ( For receiving the PDSCH by the receiving beam, refer to the previous embodiment. The DCI issuance time point in 303 is the start time of Y.

After time Y, the terminal uses the QCL hypothesis (ie, the receiving beam) indicated by the DCI in 303 to receive the PDSCH.

The value of Y is similar to the value of X, and Y may be defined in advance by a standard or configured by the base station to the terminal.

If Y is configured by the base station, it can be reflected in step 302; that is, Y is added to the configuration information to instruct the base station to issue instructions for changing the receiving beam of the aperiodic CSI-RS to the terminal using the receiving beam to receive the data channel time interval.

In addition, Y meets the beam switching capability (A-CSI-RS beam switching timing) reported by the terminal, and the optional value is {14,28,48,224,336} and other OFDM symbol time.

If Y is the terminal capability, it should also be reflected in step 301, that is, in step 301, the terminal reporting capability includes Y, which is used to instruct the base station that the terminal can support to issue a function for changing the receiving beam of aperiodic CSI-RS Indicate the time interval for the terminal to use the receiving beam to receive the data channel.

Y may be a newly added terminal capability, which is used by the terminal to instruct the base station that the terminal can support the base station to issue an instruction for changing the receiving beam of the aperiodic CSI-RS to the time interval from when the terminal uses the receiving beam to receive the data channel.

Y can also reuse the value of existing terminal capabilities. For example, in step 301, the capabilities reported by the terminal include 3 and 4, and the value of Y can be 3 or 3+4. In other words, the Y time after the start of the DCI issued by the base station to change the aperiodic CSI-RS must be greater than or equal to A-CSI-RS beam switching timing, or greater than or equal to A-CSI-RS beam switching timing+Beam reporting timing.

Therefore, whether the terminal adopts the QCL hypothesis indicated in 303 to receive the PDSCH depends on the time interval between the DCI in 303 and the PDSCH transmission in 305.

304, 305, and 306 have no time sequence, and 304 is optional. The steps after 305 are to repeat 303-305.

306: The base station again dynamically changes the receiving beam of the aperiodic CSI-RS through the DCI.

Repeat step 303.

307: The base station sends CSI-RS, and the terminal measures and reports it.

Repeat step 304.

308: The base station sends the DCI to schedule the PDSCH, and the terminal receives the PDSCH.

Repeat step 305.

The DCIs in 306 and 308 are usually different DCIs.

According to the method described in 305, whether the terminal adopts the QCL hypothesis indicated in 306 to receive the PDSCH depends on the time interval between the DCI in 306 and the PDSCH transmission in 308.

Therefore, in the above embodiment, after Y time after the aperiodic CSI-RS DCI trigger, the terminal uses the QCL indicated by the DCI trigger to receive the PDSCH; within Y time, it gives up the aperiodic CSI-RS DCI trigger issued by the base station and uses the most recent The QCL that is indicated or used once is assumed to receive the PDSCH. The DCI trigger refers to the DCI trigger that changes the QCL assumption (receive beam) of the AP CSI-RS; this avoids the failure of the terminal beam switching and ensures the normal communication between the terminal and the base station.

Optionally, in steps 305 and 308, whether the terminal adopts the QCL hypothesis indicated in the DCI to receive the PDSCH also depends on the time interval between the DCI and the PDSCH. If the time interval between DCI and PDSCH is greater than or equal to the capability 5 reported by the terminal in 301, then the terminal can use the QCL hypothesis indicated in DCI to receive PDSCH. If the time interval between DCI and PDSCH is less than the terminal reported in 201 Capability 5, the terminal uses the same QCL assumption as the PDCCH to receive the PDSCH, that is, the terminal uses the same receiving beam as the PDCCH to receive the PDSCH.

In the above embodiment, the scenario is the transmission of downlink data, that is, the base station sends downlink data to the terminal; the data channel mentioned above is the downlink data channel, for example: PDSCH; in addition, the method in the embodiment of this application can also be applied to uplink data transmission The scenario where the terminal sends uplink data to the base station:

Referring to Figure 5, another embodiment is as follows:

401: Terminal capability report.

The terminal reports to the base station that it only supports one dynamic transmission beam, that is, the maximum number of supported active spatial relations (spatialRelation) is 1. The spatial relationship is the description method of the uplink transmission beam in 3GPP R15, and can also be described as a spatial domain transmission filter.

Of course, in the following embodiments, if the terminal supports multiple dynamic transmission beams, that is, the maximum number of supported active spatialRelations is multiple, this solution is also applicable.

In addition to the capabilities reported by the terminal in 201, the terminal capabilities reported in 3GPP R15 also have the following content:

6.maxNumberActiveSpatialRelations:

The maximum supported number of activated SpatialRelations, which can be {1,2,4,8}, etc. The number of activated SpatialRelations is the number of dynamic transmission beams supported by the terminal.

maxNumberActiveSpatialRelations

indicates the maximum number of active spatial relations with Regarding to PUCCH and SRS for PUSCH, per BWP per CC (carrier component);

The Chinese translation is as follows: The maximum number of activated airspace relations refers to the maximum number of activated airspace relations per CC (carrier component) per BWP used to transmit PUCCH/SRS/PUSCH. It can be seen from this capability that a terminal with limited capability can report to support one active spatialRelation, that is, one active transmit beam. Therefore, this type of terminal does not want to support too dynamic (DCI-level) transmit beam switching, and this type of terminal does not want to track multiple beams at the same time; in the 3GPP protocol, the CC can also be a cell (Cell).

7. When the maxNumberActiveSpatialRelations of the terminal is 1, it supports an additional ActiveSpatialRelations dedicated to uplink control, that is, supports an additional beam used to transmit the uplink control channel (for example: PUCCH). The definition in the NR agreement is as follows:

additionalActiveSpatialRelationPUCCH

Indicates support of one additional active spatial relations for PUCCH, which is mandatory.

The Chinese translation is as follows: additional PUCCH activation airspace relationship refers to the PUCCH airspace relationship that supports an additional activation.

402: The base station issues configuration information, and the terminal receives the configuration information issued by the base station.

The configuration information indicates that the transmitting beam corresponding to the receiving beam of the terminal aperiodic CSI-RS is configured as the transmitting beam of the uplink data channel. In the NR protocol, RRC and MAC-CE first configure and activate the transmission beam corresponding to the aperiodic CSI-RS reception beam as the uplink sounding signal SRS transmission beam, and then DCI instructs the terminal to use the SRS transmission beam as the uplink data channel. Send beam.

Specifically, the content of the base station configuration includes:

1. SpatialRelation of SRS resources, that is, SRS transmission beams. Each SRS resource can be configured with transmission beams. Among them, at least one SRS transmission beam reference signal is aperiodic CSI-RS; that is, the AP CSI-RS The receiving beam is configured as the sending beam of SRS.

2. Trigger state of aperiodic CSI-RS

The content of MAC-CE activation includes:

1. SRS resources are activated, where at least one SRS transmission beam reference signal is aperiodic CSI-RS.

403: The base station dynamically changes the receiving beam of the aperiodic CSI-RS through the DCI.

Similar to 203, the base station dynamically indicates the QCL hypothesis of aperiodic CSI-RS through DCI, that is, indicates the receiving beam of aperiodic CSI-RS. The DCI sent by the base station (usually the CSI request field) carries a selected aperiodic The trigger state of the CSI-RS notifies the terminal device that the receiving beam of the aperiodic CSI-RS has changed. The DCI is issued through the control channel (for example: PDCCH).

After receiving the DCI, the terminal adopts the transmission beam corresponding to the changed reception beam (that is, QCL assumption) to receive the CSI-RS.

Before 403, the base station and the terminal can communicate normally, which is not of interest in this application.

404: The base station sends the CSI-RS, and the terminal measures the CSI-RS and reports the measurement result.

Similar to 204, the terminal determines the modified aperiodic CSI-RS receiving beam according to the instruction of 403, receives the CSI-RS sent by the base station through the beam, and reports the measurement result (CSI). Further, the terminal can re-determine the receiving beam according to the measurement result (ie, QCL assumption), and the base station can also re-determine the receiving beam of the terminal according to the reported measurement result; or determine that the original receiving beam is still used according to the measurement result.

This step is optional.

405: The base station sends DCI to schedule the PUSCH, the terminal sends the PUSCH, and the base station receives the PUSCH.

In the application scenario of this application, the DCI also instructs the terminal to use the transmission beam of the SRS as the transmission beam of the uplink data channel PUSCH. The transmission beam reference signal of the SRS indicated by the SRI field in the DCI is the aperiodic CSI-RS in the 403/404 step.

If 405 is executed directly after 403, since in 403, the aperiodic CSI-RS receiving beam (that is, QCL assumption) has been changed, and accordingly, the PUSCH sending beam should also be changed accordingly. The terminal uses the transmission beam corresponding to the aperiodic CSI-RS reception beam (ie QCL assumption) indicated by 403 to receive the PUSCH.

Optionally, if step 404 occurs before step 405, the terminal uses the transmit beam corresponding to the QCL hypothesis (that is, the receive beam) determined in step 404 to transmit the PUSCH. This is because aperiodic CSI-RS measurement may be used for receive beam training, so the optimal receive beam of the aperiodic CSI-RS in step 404 may have been updated, and of course the optimal beam may not be unchanged.

The DCI in 405 and 403 should usually be different DCI.

406: The base station dynamically changes the receiving beam of the aperiodic CSI-RS through DCI again (that is, instructs the terminal to change the QCL hypothesis by issuing DCI). The indication method is similar to that of 403, and the description of 403 can be referred to.

Referring to FIG. 2, the time interval between steps 403 and 406 is the time interval from DCI indication to aperiodic CSI-RS (AP CSI-RS) transmission, that is, capability 3 reported by the terminal in 401.

The time interval between the two times that the base station issues instructions for changing the received beam of aperiodic CSI-RS (that is, the DCI in 403 and the DCI in 406) should be greater than or equal to the preset time interval, that is, between 403 and 406 The time interval between the two DCIs is not less than the preset time interval; the two DCIs respectively indicate different receiving beams of the same aperiodic CSI-RS for the terminal.

If X is configured by the base station, it can be reflected in step 402; that is, adding X in the configuration information is used to limit the time interval between two DCIs to not be less than X.

If X is a terminal capability, it should also be reflected in step 401, that is, in step 401, the terminal reporting capability includes X, which is used to limit the time interval between two DCIs not less than X.

X can also reuse the value of the existing terminal capability. For example, in step 401, the capabilities reported by the terminal include 3 and 4, and the value of X can be 3 or 3+4. In other words, the time interval between two QCL indications issued by the base station for changing aperiodic CSI-RS must be greater than or equal to A-CSI-RS beam switching timing, or greater than or equal to A-CSI-RS beam switching timing+Beam reporting timing.

In addition, if the time interval between the two DCI issued by the base station is less than X, after the terminal receives the second DCI (DCI in step 406), it determines that the time interval between steps 403 and 406 is less than X, and then abandons use The sending beam corresponding to the receiving beam indicated by 406 sends PUSCH; that is to say, subsequent terminals still send PUSCH according to the sending beam corresponding to the QCL hypothesis (receiving beam) indicated by 403 or 404; or, the most recent indication (non-406 DCI indication) or the sending beam corresponding to the used receiving beam (or QCL assumption) to send PUSCH, or the last indicated or used sending beam to send PUSCH, such as the sending beam used to communicate with the base station before 403; the communication content includes: receiving PDSCH , Receive PDCCH, send PUSCH, send PUCCH, etc.; that is, send/receive data or signaling.

404, 405, and 406 have no time sequence, and 404 is optional. The steps after 406 are to repeat 404-405 until the terminal sends PUSCH.

407: The base station sends CSI-RS, and the terminal measures and reports the measurement result.

408: The base station sends DCI to schedule the PUSCH, the terminal sends the PUSCH, and the base station receives the PUSCH.

Steps 407-408 are repeated 404-405.

Some steps of the foregoing embodiment are similar to those in the embodiment in FIG. 3, and the description of the embodiment in FIG. 3 may be referred to.

Therefore, in the above-mentioned embodiment, if it is satisfied that "the time interval between steps 403 and 406 is not less than X (that is, the minimum time interval between the two times the base station issues instructions for changing the received beam of aperiodic CSI-RS) ”, the terminal transmits PUSCH according to the corresponding transmission beam of the QCL assumption indicated in 406. If it is not satisfied, the terminal abandons the QCL assumption of step 406 and still follows the corresponding transmission beam of the QCL assumption indicated in 403 or 404, or The PUSCH is sent using the most recently instructed or used transmission beam, which avoids the failure of the terminal beam switching and the inability to communicate with the base station normally.

In the above-mentioned embodiment, the time interval X is set to instruct the base station to issue the minimum time interval between two indications for changing the received beam of the aperiodic CSI-RS, and the time interval between the two DCIs is compared with X for comparison. The results are processed in different ways; in another embodiment, another time interval Y can be set. Referring to Figure 6, another example of the beam indication method is as follows:

501: Terminal capability feedback.

Same as 401, please refer to 401.

502: The base station issues the configuration, and the terminal receives the base station configuration.

Same as 402.

503: The base station dynamically changes the receiving beam of the aperiodic CSI-RS through DCI.

Same as 403.

Before 503, the base station and the terminal can communicate normally, which is not concerned in this application.

504: The base station sends the CSI-RS, and the terminal measures and reports the measurement result.

This step is optional and the same as 404.

505: The base station sends DCI to schedule the PUSCH, the terminal sends the PUSCH, and the base station receives the PUSCH.

In the application scenario of this application, the DCI also instructs the terminal to use the transmission beam of the SRS as the transmission beam of the uplink data channel PUSCH. The SRS transmission beam reference signal indicated by the SRI field in the DCI is the aperiodic CSI-RS in the 503/504 step.

The DCIs in 503 and 505 are usually different DCIs.

Although in 503, the QCL assumption (that is, the receiving beam) of the aperiodic CSI-RS has been changed, since the CSI-RS may not have been sent yet, the terminal has not yet measured the latest aperiodic CSI-RS, and has not yet determined a new one. Therefore, the transmission beam of the terminal for transmitting PUSCH can be unchanged.

This embodiment introduces time period Y, which is similar to Y in 305. Within the start Y time of DCI (including the end time point of Y), the terminal abandons using the transmission beam corresponding to the receiving beam indicated by the DCI in 503 to transmit PUSCH; the terminal can Use the transmit beam (the transmit beam that was the last instruction or use) corresponding to the QCL hypothesis (receive beam) that was last indicated or used before 503 to transmit the PUSCH, refer to the description of the previous embodiment. The DCI issuance time point in 503 is the start time of Y.

After time Y, the terminal uses the transmission beam corresponding to the QCL hypothesis (receive beam) indicated by the DCI in 503 to transmit the PUSCH.

If Y is configured by the base station, it can be reflected in step 502; that is, Y is added to the configuration information to instruct the base station to issue instructions for changing the receiving beam of aperiodic CSI-RS to the terminal to use the corresponding transmitting beam of the receiving beam The time interval to send the uplink data channel.

If Y is the terminal capability, it should also be reflected in step 501, that is, in step 501, the terminal reporting capability includes Y, which is used to instruct the base station that the terminal can support to issue a function for changing the receiving beam of aperiodic CSI-RS Indicate the time interval for the terminal to use the sending beam corresponding to the receiving beam to send the uplink data channel.

Y can be a new terminal capability for the terminal to instruct the base station that the terminal can support to issue an instruction for changing the receiving beam of aperiodic CSI-RS to the terminal to use the corresponding transmitting beam of the receiving beam to send uplink data The time interval of the channel. It can also be the same as Y in 305.

Y can also reuse the value of the existing terminal capabilities. For example, in step 501, the capabilities reported by the terminal include 3 and 4, and the value of Y can be 3 or 3+4. In other words, the Y time after the start of the DCI issued by the base station to change the aperiodic CSI-RS must be greater than or equal to A-CSI-RS beam switching timing, or greater than or equal to A-CSI-RS beam switching timing+Beam reporting timing.

Therefore, whether the terminal uses the transmission beam corresponding to the QCL hypothesis indicated in 503 to transmit the PUSCH depends on the time interval between the DCI in 503 and the PUSCH transmission in 505.

504, 505, and 506 have no time sequence, and 504 is optional. The steps after 505 are to repeat 503-505.

506: The base station dynamically changes the QCL indication of the aperiodic CSI-RS through the DCI again.

Repeat step 503.

507: The base station sends CSI-RS, and the terminal measures and reports it.

Repeat step 504.

508: The base station sends DCI to schedule the PUSCH, the terminal sends the PUSCH, and the base station receives the PUSCH.

Repeat step 505.

The DCI in 506 and 508 are usually different DCIs.

Some steps of the foregoing embodiment are similar to those in the embodiment in FIG. 4, and the description of the embodiment in FIG. 4 may be referred to.

According to the method described in 505, whether the terminal uses the transmission beam corresponding to the QCL hypothesis indicated in 506 to transmit the PUSCH depends on the time interval between the DCI in 506 and the PUSCH transmission in 508.

Therefore, in the above embodiment, after Y time after the aperiodic CSI-RS DCI trigger, the terminal uses the transmission beam corresponding to the QCL indicated by the DCI trigger to transmit the PUSCH, and the aperiodic CSI-RS issued by the base station is abandoned within Y time DCI trigger, which uses the most recently indicated or used transmit beam to send PUSCH. DCI trigger refers to the DCI trigger that changes the QCL assumption (receive beam) of the AP CSI-RS; this avoids the failure of terminal beam switching and ensures the terminal and base station Normal communication.

Based on the method of the foregoing embodiment, the communication device provided in the present application will be introduced below.

FIG. 7 shows a schematic structural diagram of a communication device provided by the present application. The communication device 600 includes a communication unit 610 and a processing unit 620.

The communication unit 610 is configured to perform signal receiving and sending operations in the foregoing method embodiment, that is, to implement a communication function.

The processing unit 620 is configured to perform other operations other than signal transmission and reception in the foregoing method embodiment, and determine the time interval and the preset time period.

Optionally, the communication unit 610 is also called a transceiving unit (or module), and may include a receiving unit (module) and/or a sending unit (module), which are used to execute the method embodiment and the terminal device in FIGS. 3-6 to receive and Steps to send. Optionally, the communication device 600 may further include a storage unit for storing instructions executed by the communication unit 610 and the processing unit 620.

For example: in the method described in FIG. 3, when the communication device 600 is a terminal device, the method includes:

Receiving module: used to receive configuration information issued by a network device, the configuration information indicating that the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the receiving beam of the data channel; receiving the first downlink issued by the network device Control information DCI, where the first DCI is used to indicate the receiving beam of aperiodic CSI-RS; and the second DCI issued by the receiving network device is used to indicate the receiving beam of the aperiodic CSI-RS;

Processing module: If the time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching time of the terminal device, it is used to instruct the receiving module to use the receiving beam indicated by the second DCI to receive the data sent by the network device Data channel; or if the time interval between the first DCI and the second DCI is less than the aperiodic CSI-RS beam switching time of the terminal device, it is used to abandon the use of the receiving beam indicated by the second DCI.

Further, the receiving module is further configured to: use the receiving beam indicated by the first DCI to receive the data channel issued by the network device, or use the most recently used receiving beam to receive the data channel issued by the network device.

For example, in the method described in FIG. 4, when the communication device 600 is a terminal device, the method includes:

Receiving module: used to receive configuration information issued by a network device, the configuration information indicating that the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as a data channel receiving beam; receiving downlink control information DCI issued by the network device, The DCI is used to indicate the receiving beam of aperiodic CSI-RS;

Processing module: within a preset time period after the start of the DCI, used to instruct the receiving module to use the most recently used receiving beam before the DCI to receive the data channel issued by the network device; or the preset time after the start of the DCI After the paragraph, it is used to instruct the receiving module to use the receiving beam indicated by the DCI to receive the data channel issued by the network device;

Wherein, the preset time period is not less than the aperiodic CSI-RS beam switching time of the terminal device.

For example, in the method described in FIG. 5, when the communication device 600 is a terminal device, the method includes:

Receiving module: used to receive configuration information issued by a network device, where the configuration information indicates that the transmitting beam corresponding to the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the transmitting beam of the uplink data channel; the receiving network device issued The first downlink control information DCI is used to indicate the aperiodic CSI-RS receiving beam; and the second DCI issued by the network device is received, and the second DCI is used to indicate the aperiodic CSI-RS ’S receive beam;

Sending module: If the time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching time of the terminal device, it is used to send uplink to the network device using the sending beam corresponding to the receiving beam indicated by the second DCI Data channel; or if the time interval between the first DCI and the second DCI is less than the aperiodic CSI-RS beam switching time of the terminal device, it is used to give up using the transmit beam corresponding to the receive beam indicated by the second DCI.

Further, the sending module is further configured to: use the sending beam corresponding to the receiving beam indicated by the first DCI to send the uplink data channel to the network device, or use the most recently used sending beam to send the uplink data channel to the network device.

For example: in the method described in FIG. 6, when the communication device 600 is a terminal device, the method includes:

Receiving module: used to receive configuration information issued by a network device, where the configuration information indicates that the transmitting beam corresponding to the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the transmitting beam of the uplink data channel; the receiving network device issued Downlink control information DCI for indicating aperiodic CSI-RS receiving beam;

Sending module: within a preset time period after the start of the DCI, used to send the uplink data channel to the network device using the transmit beam last used before the DCI; or after the preset time period after the start of the DCI Sending the uplink data channel to the network device by using the sending beam corresponding to the receiving beam indicated by the DCI;

The communication device 600 is a terminal device, and may also be a chip in the terminal device. When the communication device is a terminal device, the processing unit may be a processor, and the communication unit may be a transceiver. The communication device may further include a storage unit, and the storage unit may be a memory. The storage unit is used to store instructions, and the processing unit executes the instructions stored in the storage unit, so that the communication device executes the foregoing method. When the communication device is a chip in a terminal device, the processing unit may be a processor, and the communication unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit to enable the communication The device executes the operations performed by the terminal device in the foregoing method embodiment, and the storage unit may be a storage unit (for example, a register, cache, etc.) in the chip, or a storage unit in the terminal device located outside the chip (For example, read only memory, random access memory, etc.)

Those skilled in the art can clearly understand that the steps performed by the communication device 600 and the corresponding beneficial effects can be referred to the relevant description of the terminal device in the foregoing method embodiment, and for brevity, details are not repeated here.

It should be understood that the communication unit 610 may be implemented by a transceiver, and the processing unit 620 may be implemented by a processor. The storage unit can be realized by a memory. As shown in FIG. 8, the communication device 700 may include a processor 710, a memory 720, and a transceiver 730.

The communication device 600 shown in FIG. 7 or the communication device 700 shown in FIG. 8 can implement the foregoing embodiments and the steps performed by the terminal device in FIGS. 3-6. For similar descriptions, reference may be made to the descriptions in the foregoing corresponding methods. To avoid repetition, I won’t repeat them here.

FIG. 9 shows a schematic structural diagram of a communication device 800 provided by the present application. The communication device 800 includes a processing unit 810 and a communication unit 820.

The processing unit 810 is configured to perform signal receiving and sending operations in the foregoing method embodiment, that is, to implement a communication function.

The communication unit 820 is configured to perform other operations other than signal transmission and reception in the foregoing method embodiment, such as determination of time intervals and preset time periods.

Optionally, the communication unit 820 may be called a transceiving unit (or module), including a receiving unit (module) and/or a sending unit (module), which are respectively used to execute the method embodiment and the network device in FIGS. 3-6 to receive and send A step of. Optionally, the communication device 800 may further include a storage unit for storing instructions executed by the communication unit 820 and the processing unit 810.

For example, in the method described in FIG. 3, when the communication device 600 is a network device, the method includes:

Sending module: used to send configuration information to the terminal device, the configuration information indicating that the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the receiving beam of the data channel; the first downlink control information issued to the terminal device DCI, the first DCI is used to indicate the receiving beam of aperiodic CSI-RS; and the second DCI issued to the terminal device, the second DCI is used to indicate the receiving beam of the aperiodic CSI-RS; where:

The time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching time of the terminal device.

For example: in the method described in FIG. 5, when the communication device 600 is a network device, the method includes:

Sending module: used to send configuration information to the terminal device, the configuration information indicating that the sending beam corresponding to the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the sending beam of the uplink data channel; the first sent to the terminal device A downlink control information DCI, the first DCI is used to indicate the reception beam of aperiodic CSI-RS; and the second DCI issued to the terminal equipment, the second DCI is used to indicate the reception of aperiodic CSI-RS Beam; where:

In each of the foregoing device embodiments, the determination of the time interval and the preset time period may be performed by the processing module, and the sending module or the receiving module may perform corresponding operations according to the processing result of the processing module.

The apparatus 800 is a network device in the method embodiment, and may also be a chip in the network device. When the device is a network device, the processing unit may be a processor, and the communication unit may be a transceiver. The device may further include a storage unit, and the storage unit may be a memory. The storage unit is used to store instructions, and the processing unit executes the instructions stored in the storage unit, so that the communication device executes the foregoing method. When the device is a chip in a network device, the processing unit may be a processor, and the communication unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes instructions stored in the storage unit to enable the communication The device executes the operations performed by the network device in the foregoing method embodiments, and the storage unit may be a storage unit (for example, a register, cache, etc.) in the chip, or a storage unit located outside the chip in the communication device (For example, read only memory, random access memory, etc.).

Those skilled in the art can clearly understand that the steps performed by the apparatus 800 and the corresponding beneficial effects can be referred to the related description of the network device in the above method embodiment, and for the sake of brevity, details are not repeated here.

It should be understood that the communication unit 820 may be implemented by a transceiver, and the processing unit 810 may be implemented by a processor. The storage unit can be realized by a memory. As shown in FIG. 10, the communication device 900 may include a processor 910, a memory 920, and a transceiver 930.

The communication device 800 shown in FIG. 9 or the communication device 900 shown in FIG. 10 can implement the foregoing method embodiments and the steps performed by the network devices in FIGS. 3-6. For similar descriptions, reference may be made to the descriptions in the foregoing corresponding methods. To avoid repetition, I won’t repeat them here.

The network equipment in each of the above apparatus embodiments corresponds to the network equipment or terminal equipment in the terminal equipment and method embodiments, and the corresponding modules or units execute the corresponding steps. For example, the communication unit (or transceiver unit, transceiver) method executes the sending and/or receiving steps in the method embodiment (or is executed by the sending unit and the receiving unit respectively), and other steps except the sending and receiving can be performed by the processing unit (processor )carried out. For the functions of specific units, refer to the corresponding method embodiments. The sending unit and the receiving unit may form a transceiver unit, and the transmitter and receiver may form a transceiver to jointly implement the transceiver function in the method embodiment; there may be one or more processors.

It should be understood that the division of the above-mentioned units is only a functional division, and there may be other division methods in actual implementation.

The communication device in each of the foregoing embodiments may also be a chip or a functional unit in a terminal device or a network device, and the processing unit may be implemented by hardware or software. When implemented by hardware, the processing unit may be a logic circuit, an integrated circuit, or the like. When implemented by software, the processing unit can be a general-purpose processor, which can be implemented by reading the software code stored in the storage unit. The storage unit can be integrated in the processor or can exist independently of the processor. .

FIG. 11 is a schematic structural diagram of a terminal device 1000 provided by this application. For ease of description, FIG. 11 only shows the main components of the terminal device. As shown in FIG. 11, the terminal device 1000 includes a processor, a memory, a control circuit, an antenna, and an input and output device. The terminal device 1000 can be applied to the system shown in FIG. 1 to perform the functions of the terminal device in the foregoing method embodiment.

The processor is mainly used to process the communication protocol and communication data, and to control the entire terminal device, execute the software program, and process the data of the software program, for example, to control the terminal device to perform the actions described in the above method embodiment. The memory is mainly used to store software programs and data. The control circuit is mainly used for the conversion of baseband signal and radio frequency signal and the processing of radio frequency signal. The control circuit and the antenna together can also be called a transceiver, which is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users.

When the terminal device is turned on, the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor performs baseband processing on the data to be sent and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and then sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.

Those skilled in the art can understand that, for ease of description, FIG. 11 only shows a memory and a processor. In actual terminal devices, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, etc., which is not limited in the embodiment of the present application.

As an optional implementation, the processor may include a baseband processor and a central processing unit. The baseband processor is mainly used to process communication protocols and communication data. The central processing unit is mainly used to control the entire terminal device and execute Software program, processing the data of the software program. The processor in FIG. 11 integrates the functions of the baseband processor and the central processing unit. Those skilled in the art can understand that the baseband processor and the central processing unit may also be independent processors, which are interconnected by technologies such as buses. Those skilled in the art can understand that the terminal device may include multiple baseband processors to adapt to different network standards, the terminal device may include multiple central processors to enhance its processing capabilities, and various components of the terminal device may be connected through various buses. The baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and communication data can be built in the processor, or can be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.

Exemplarily, in the embodiment of FIG. 11, the antenna and the control circuit with the transceiving function can be regarded as the transceiving unit 1001 of the terminal device 1000, and the processor with the processing function can be regarded as the processing unit 1002 of the terminal device 1000. As shown in FIG. 11, the terminal device 1000 includes a transceiver unit 1001 and a processing unit 1002. The transceiver unit may also be called a transceiver, a transceiver, a transceiver, and so on. Optionally, the device for implementing the receiving function in the transceiver unit 1001 can be regarded as the receiving unit, and the device for implementing the sending function in the transceiver unit 1001 as the sending unit, that is, the transceiver unit 1001 includes a receiving unit and a sending unit. Exemplarily, the receiving unit may also be called a receiver, a receiver, a receiving circuit, etc., and the sending unit may be called a transmitter, a transmitter, or a transmitting circuit, etc.

The terminal device 1000 shown in FIG. 11 can implement various processes involving the terminal device in the method embodiments of FIGS. 3-6. The operations and/or functions of each module in the terminal device 1000 are respectively for implementing the corresponding processes in the foregoing method embodiments. For details, please refer to the descriptions in the foregoing method embodiments. To avoid repetition, detailed descriptions are appropriately omitted here.

FIG. 12 is a schematic structural diagram of a network device provided by an embodiment of this application, for example, it may be a schematic structural diagram of a network device. As shown in FIG. 12, the network device 1100 can be applied to the system shown in FIG. 1 to perform the functions of the network device in the foregoing method embodiment.

The network can be applied to the communication system shown in FIG. 1 to perform the functions of the network device in the above method embodiment. The network device 1100 may include one or more radio frequency units, such as a remote radio unit (RRU) 1110 and one or more baseband units (BBU) (also referred to as digital units (DU) )) 1120.

The RRU 1110 may be called a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and it may include at least one antenna 1111 and a radio frequency unit 1112. The RRU 1110 part is mainly used for the transmission and reception of radio frequency signals and the conversion between radio frequency signals and baseband signals, for example, for sending the indication information in the foregoing method embodiments. The RRU 1110 and the BBU 1120 may be physically set together, or may be physically separated, that is, a distributed base station.

The BBU 1120 is the control center of the base station, and may also be called a processing unit, which is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading. For example, the BBU (processing unit) 1120 may be used to control the network device to execute the operation flow of the network device in the foregoing method embodiment.

In an embodiment, the BBU 1120 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network with a single access indication (such as an NR network), or support different access standards. Wireless access network (such as LTE network, 5G network or other network). The BBU 1120 also includes a memory 1121 and a processor 1122, and the memory 1121 is used to store necessary instructions and data. The processor 1122 is used to control the base station to perform necessary actions, for example, to control the network device to execute the operation flow of the network device in the foregoing method embodiment. The memory 1121 and the processor 1122 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.

It should be understood that the network device 1100 shown in FIG. 12 can implement various processes involving the network device in the method embodiments in FIGS. 3-6. The operations and/or functions of each module in the network device 1100 are respectively set to implement the corresponding processes in the foregoing method embodiments. For details, please refer to the descriptions in the foregoing method embodiments. To avoid repetition, detailed descriptions are appropriately omitted here.

It should be noted that the communication unit in the embodiment of the present application may also be referred to as a transceiver unit or a transceiver module.

It should be understood that the foregoing processing device may be a chip. For example, the processing device may be a Field-Programmable Gate Array (FPGA), a dedicated integrated chip (Application Specific Integrated Circuit, ASIC), a system chip (System on Chip, SoC), and a central processor (Central Processor). Unit, CPU), network processor (Network Processor, NP), digital signal processing circuit (Digital Signal Processor, DSP), microcontroller (Micro Controller Unit, MCU), programmable controller (Programmable Logic Device, PLD) or Other integrated chips, etc.

In the implementation process, each step in the method provided in this embodiment can be completed by an integrated logic circuit of hardware in the processor or instructions in the form of software. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.

It should be noted that the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software. The above-mentioned processor may be a general-purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated crcuit, ASIC), a ready-made programmable gate array (field programmable gate array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components. The processors in the embodiments of the present application may implement or execute the methods, steps, and logical block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.

It can be understood that the memory or storage unit in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile 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), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (RAM), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (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 connection 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 memories of the systems and methods described herein are intended to include, but are not limited to, these and any other suitable types of memories.

An embodiment of the present application also provides a communication system, which includes a sending end device and a receiving end device. For example, the sending end device is the network device in the foregoing embodiment, and the receiving end device is the terminal device in the foregoing embodiment; or, the sending end device is the terminal device in the foregoing embodiment, and the receiving end device is the network device in the foregoing embodiment.

The embodiment of the present application also provides a computer-readable medium on which a computer program is stored, and when the computer program is executed by a computer or a processor, the method in any of the foregoing embodiments is implemented.

The embodiments of the present application also provide a computer program product, which implements the method in any of the foregoing embodiments when the computer program product is executed by a computer or a processor.

The embodiment of the present application also provides a system chip, which includes a processing unit and a communication unit. The processing unit may be a processor, for example. The communication unit may be, for example, an input/output interface, a pin, or a circuit. The processing unit can execute computer instructions so that the chip in the communication device executes any of the methods provided in the foregoing embodiments of the present application.

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

It should also be understood that the "saving" involved in the embodiments of the present application may refer to storing in one or more memories. The one or more memories may be provided separately, or integrated in an encoder or decoder, a processor, or a communication device. The one or more memories may also be partly provided separately, and partly integrated in the decoder, processor, or communication device. The type of memory may be any form of storage medium, which is not limited in this application.

It should also be understood that the "protocol" in the embodiments of the present application may refer to standard protocols in the communication field, for example, may include LTE protocol, NR protocol, and related protocols applied to future communication systems, which are not limited in this application.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instruction may be transmitted from a website, computer, server, or data center through a cable (Such as coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (such as infrared, wireless, microwave, etc.) to another website site, computer, server or data center. 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 or data center integrated with one or more available media. The usable medium can be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk (SSD)). ))Wait.

In this application, "at least one" refers to one or more, and "multiple" refers to two or more. "And/or" describes the association relationship of the associated object, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, both A and B exist, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects are in an "or" relationship. "The following at least one item (a)" or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a). For example, at least one item (a) of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple .

It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present application. Therefore, appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in the various embodiments of the present application, the size of the sequence numbers of the foregoing processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not correspond to the embodiments of the present application. The implementation process constitutes any limitation.

Claims

A beam indicating method, characterized in that it comprises:

The terminal device receives configuration information issued by the network device, where the configuration information indicates that the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the receiving beam of the data channel;

Receiving, by the terminal device, first downlink control information DCI issued by the network device, where the first DCI is used to indicate a receiving beam of aperiodic CSI-RS;

Receiving, by the terminal device, a second DCI issued by the network device, where the second DCI is used to indicate a receiving beam of aperiodic CSI-RS;

If the time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching time of the terminal device, the terminal device uses the receiving beam indicated by the second DCI to receive the data channel issued by the network device; or

If the time interval between the first DCI and the second DCI is less than the aperiodic CSI-RS beam switching time of the terminal device, the terminal device abandons using the receiving beam indicated by the second DCI.
The method according to claim 1, if the time interval between the first DCI and the second DCI is less than the aperiodic CSI-RS beam switching time of the terminal device, the method further comprises:

The terminal device uses the receiving beam indicated by the first DCI to receive the data channel issued by the network device, or

The terminal device uses the most recently instructed or used receiving beam to receive the data channel issued by the network device.
A beam indicating method, characterized in that it comprises:

The network device sends configuration information to the terminal device, the configuration information indicating that the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the receiving beam of the data channel;

The first downlink control information DCI delivered by the network device to the terminal device, where the first DCI is used to indicate a receiving beam of aperiodic CSI-RS;

A second DCI delivered by the network device to the terminal device, where the second DCI is used to indicate a receiving beam of aperiodic CSI-RS; where:

The time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching time of the terminal device.
A beam indicating method, characterized in that it comprises:

The terminal device receives configuration information issued by the network device, where the configuration information indicates that the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the data channel receiving beam;

Receiving, by the terminal device, downlink control information DCI issued by the network device, where the DCI is used to indicate a receiving beam of aperiodic CSI-RS;

Within a preset time period after the start of the DCI, the terminal device uses the receiving beam that was most recently instructed or used before the DCI to receive the data channel issued by the network device; or

After a preset period of time after the start of the DCI, the terminal device uses the receiving beam indicated by the DCI to receive the data channel issued by the network device;

Wherein, the preset time period is not less than the aperiodic CSI-RS beam switching time of the terminal device.
A beam indicating method, characterized in that it comprises:

The terminal device receives configuration information issued by the network device, where the configuration information indicates that the transmission beam corresponding to the reception beam of the aperiodic channel state information reference signal CSI-RS is used as the transmission beam of the uplink data channel;

Receiving, by the terminal device, first downlink control information DCI issued by the network device, where the first DCI is used to indicate a receiving beam of aperiodic CSI-RS;

Receiving, by the terminal device, a second DCI issued by the network device, where the second DCI is used to indicate a receiving beam of aperiodic CSI-RS;

If the time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching time of the terminal device, the terminal device uses the transmitting beam corresponding to the receiving beam indicated by the second DCI to send uplink data to the network device Channel; or

If the time interval between the first DCI and the second DCI is less than the aperiodic CSI-RS beam switching time of the terminal device, the terminal device abandons using the transmission beam corresponding to the reception beam indicated by the second DCI.
The method according to claim 5, if the time interval between the first DCI and the second DCI is less than the aperiodic CSI-RS beam switching time of the terminal device, the method further comprises:

The terminal device uses the transmitting beam corresponding to the receiving beam indicated by the first DCI to send the uplink data channel to the network device, or

The terminal device sends the uplink data channel to the network device by using the most recently instructed or used transmission beam.
A beam indicating method, characterized in that it comprises:

The network device sends configuration information to the terminal device, where the configuration information indicates that the transmission beam corresponding to the reception beam of the aperiodic channel state information reference signal CSI-RS is used as the transmission beam of the uplink data channel;

The first downlink control information DCI delivered by the network device to the terminal device, where the first DCI is used to indicate a receiving beam of aperiodic CSI-RS;

A second DCI delivered by the network device to the terminal device, where the second DCI is used to indicate a receiving beam of aperiodic CSI-RS; where:

The time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching time of the terminal device.
A beam indicating method, characterized in that it comprises:

The terminal device receives configuration information issued by the network device, where the configuration information indicates that the transmission beam corresponding to the reception beam of the aperiodic channel state information reference signal CSI-RS is used as the transmission beam of the uplink data channel;

Receiving, by the terminal device, downlink control information DCI issued by the network device, where the DCI is used to indicate a receiving beam of aperiodic CSI-RS;

Within a preset time period after the start of the DCI, the terminal device uses the transmission beam that was most recently instructed or used before the DCI to send the uplink data channel to the network device; or

After a preset period of time after the start of the DCI, the terminal device uses the transmitting beam corresponding to the receiving beam indicated by the DCI to send the uplink data channel to the network device;

Wherein, the preset time period is not less than the aperiodic CSI-RS beam switching time of the terminal device.
A communication device, characterized by comprising:

Receiving module: used to receive configuration information issued by a network device, the configuration information indicating that the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the receiving beam of the data channel; receiving the first issued by the network device Downlink control information DCI, the first DCI is used to indicate the receiving beam of aperiodic CSI-RS; and the second DCI issued by the network device is received, and the second DCI is used to indicate the aperiodic CSI-RS Receive beam

Processing module: if the time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching time of the communication device, it is used to instruct the receiving module to use the receiving beam indicated by the second DCI to receive the network device Data channel issued; or

If the time interval between the first DCI and the second DCI is less than the aperiodic CSI-RS beam switching time of the communication device, it is used to give up using the receiving beam indicated by the second DCI.
9. The communication device according to claim 9, if the time interval between the first DCI and the second DCI is less than the aperiodic CSI-RS beam switching time of the communication device, the receiving module is further configured to:

Use the receiving beam indicated by the first DCI to receive the data channel issued by the network device, or

Receiving the data channel issued by the network device by using the most recent indication or receiving beam used.
A communication device, characterized by comprising:

Sending module: used to send configuration information to a terminal device, the configuration information indicating that the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the receiving beam of the data channel; the first downlink sent to the terminal device Control information DCI, the first DCI is used to indicate the receiving beam of aperiodic CSI-RS; and the second DCI issued to the terminal device, the second DCI is used to indicate the receiving beam of the aperiodic CSI-RS ;among them:

The time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching time of the terminal device.
A communication device, characterized by comprising:

Receiving module: used to receive configuration information issued by the network device, the configuration information indicating that the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the data channel receiving beam; receiving the downlink control information issued by the network device DCI, where the DCI is used to indicate the receiving beam of aperiodic CSI-RS;

Processing module: within a preset time period after the start of the DCI, for instructing the receiving module to use the receiving beam that was instructed or used last time before the DCI to receive the data channel issued by the network device; or

After a preset period of time after the start of the DCI, it is used to instruct the receiving module to use the receiving beam indicated by the DCI to receive the data channel issued by the network device;

Wherein, the preset time period is not less than the aperiodic CSI-RS beam switching time of the communication device.
A communication device, characterized by comprising:

Receiving module: used to receive configuration information issued by a network device, the configuration information indicating that the transmission beam corresponding to the reception beam of the aperiodic channel state information reference signal CSI-RS is used as the transmission beam of the uplink data channel; receiving the network device Issued first downlink control information DCI, the first DCI is used to indicate the receiving beam of aperiodic CSI-RS; and the second DCI issued by the network device is received, the second DCI is used to indicate the non-periodic CSI-RS Periodic CSI-RS receiving beam;

Sending module: if the time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching time of the communication device, it is used to send to the network device the sending beam corresponding to the receiving beam indicated by the second DCI Uplink data channel; or if the time interval between the first DCI and the second DCI is less than the aperiodic CSI-RS beam switching time of the communication device, used to abandon the use of the transmission beam corresponding to the reception beam indicated by the second DCI .
The communication device according to claim 13, if the time interval between the first DCI and the second DCI is less than the aperiodic CSI-RS beam switching time of the communication device, the sending module is further configured to:

Use the transmitting beam corresponding to the receiving beam indicated by the first DCI to send the uplink data channel to the network device, or

Send the uplink data channel to the network device by using the most recently instructed or used transmitting beam.
A communication device, characterized by comprising:

Sending module: used to send configuration information to a terminal device, the configuration information indicating that the sending beam corresponding to the receiving beam of the aperiodic channel state information reference signal CSI-RS is used as the sending beam of the uplink data channel; sending to the terminal device The first downlink control information DCI for indicating the aperiodic CSI-RS receiving beam; and the second DCI issued to the terminal device, the second DCI for indicating the aperiodic CSI -RS receiving beam; where:

The time interval between the first DCI and the second DCI is not less than the aperiodic CSI-RS beam switching time of the terminal device.
A communication device, characterized by comprising:

Receiving module: used to receive configuration information issued by a network device, the configuration information indicating that the transmission beam corresponding to the reception beam of the aperiodic channel state information reference signal CSI-RS is used as the transmission beam of the uplink data channel; receiving the network device Issued downlink control information DCI, where the DCI is used to indicate the receiving beam of aperiodic CSI-RS;

Sending module: within a preset time period after the start of the DCI, used to send an uplink data channel to the network device using the transmit beam that was last indicated or used before the DCI; or a preset time after the start of the DCI After the paragraph, it is used to send an uplink data channel to the network device by using the sending beam corresponding to the receiving beam indicated by the DCI;

Wherein, the preset time period is not less than the aperiodic CSI-RS beam switching time of the communication device.
A communication device, characterized in that the device comprises:

Memory for storing computer programs;

The processor is configured to call and execute the computer program stored in the memory to implement the method according to any one of claims 1 to 8.
A computer storage medium, wherein the computer readable storage medium stores a computer program, and when the computer program is executed by a computer, the method according to any one of claims 1 to 8 is realized.