CN109962765B

CN109962765B - Method and device for transmitting wireless signals through PDSCH

Info

Publication number: CN109962765B
Application number: CN201810151871.1A
Authority: CN
Inventors: 秦城; 徐凯; 孙彦良
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-12-22
Filing date: 2018-02-14
Publication date: 2020-09-29
Anticipated expiration: 2038-02-14
Also published as: CN109962765A

Abstract

The application discloses a method and a device for transmitting wireless signals through a PDSCH. In the application, the network device and the terminal device may define a preset rule set and select a preset rule mode for determining the TCI state from the preset rule set, and then the network device selects a preset rule from the preset rule set when it is determined that the time duration of the interval between the DCI carried by the PDCCH and the radio signal carried by the PDSCH to be transmitted is greater than a certain preset value, and transmits the radio signal carried by the PDSCH according to the TCI state determined by the selected preset rule. The terminal device may also select a preset rule from the preset rule set, and receive the radio signal carried by the PDSCH according to the TCI state determined by the selected preset rule. The method can better adapt to actual channel change and improve transmission quality by flexibly selecting the preset rule for determining the TCI state.

Description

Method and device for transmitting wireless signals through PDSCH

The present application claims the priority of chinese patent application with the patent office of china, application number 201711398743.9, entitled "beam indication method and apparatus for PDSCH" filed on 22/12/2017, the entire contents of which are incorporated herein by reference. For the sake of brevity only, the entire contents of which are not repeated in the text of this document.

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting a wireless signal through a PDSCH.

Background

In the next-generation wireless communication system, a communication apparatus can perform transmission and reception of wireless signals using a multiple antenna technique. Specifically, the transmitting end may generate directional beams with directivity by using a plurality of antennas, and transmit a wireless signal through the directional beams, so as to ensure that the wireless signal can be normally transmitted in a high-frequency range as much as possible. Therefore, for the receiving end, it is necessary to know in advance which directional beam the wireless signal to be received is transmitted by, so as to correctly receive the wireless signal.

At present, each kind of wireless signal transmission in the downlink direction of the network device needs to perform beam indication on the terminal device, so that the terminal device knows which directional beam to use to receive the wireless signal. In the beam indication of a radio signal transmitted on a downlink physical shared channel (PDSCH), a network device generally transmits Downlink Control Information (DCI) through a Physical Downlink Control Channel (PDCCH) before transmitting the radio signal through the PDSCH, where the DCI carries a Transmission Configuration Indicator (TCI) state for indicating a directional beam used when receiving and transmitting the radio signal on the PDSCH. However, since it takes a certain time for the terminal device to demodulate the DCI carried by the PDCCH, if the time length of the interval between the network device sending the DCI through the PDCCH and the network device sending the wireless signal through the PDSCH is less than the time length taken by the terminal device to demodulate the DCI carried by the PDCCH, when the network device sends the wireless signal through the PDSCH, the terminal device cannot timely acquire the TCI state carried in the DCI, and thus cannot confirm which directional beam is used to receive the wireless signal on the PDSCH.

For the above situation, in the existing scheme, the network device may pre-specify a TCI state and indicate the TCI state to the terminal device, and when a duration of an interval between the network device transmitting DCI via the PDCCH and transmitting a radio signal via the PDSCH is smaller than a preset value (the preset value is determined by a capability of the terminal device to demodulate DCI carried by the PDCCH), the network device transmits the radio signal via the PDSCH according to the pre-specified TCI state, and accordingly, the terminal device also receives the radio signal via the PDSCH according to the pre-specified TCI state. However, it is difficult to adapt to the actual channel variation by fixedly adopting the pre-specified TCI status, so that the transmission quality of the wireless signal transmitted through the PDSCH is poor.

Disclosure of Invention

The application provides a method and a device for transmitting a wireless signal carried by a PDSCH (physical Downlink shared channel), so as to improve the transmission quality when the wireless signal is transmitted by the PDSCH.

In a first aspect, a method of transmitting wireless signals carried by PDSCH is provided, which may be performed by a network device, such as a base station. The method comprises the following steps: the network equipment determines that a first time length is smaller than a first preset value, wherein the first time length is the time length of an interval between DCI (downlink control information) carried by the PDCCH (physical downlink control channel) sent by the network equipment at this time and a wireless signal carried by the PDSCH to be sent; further, the network device determines a second duration, where the second duration is a duration of an interval between the network device sending the DCI carried by the PDCCH this time and the network device sending the DCI carried by the PDCCH last time; when the second duration is smaller than a second preset value, the network equipment sends a wireless signal carried by the PDSCH according to a first TCI state indicated in the DCI carried by the last sent PDCCH; and when the second duration is greater than or equal to the second preset value, the network equipment sends the radio signal carried by the PDSCH according to a second pre-specified TCI state.

In the method, after the network device determines that the first time length is smaller than the first preset value, that is, when the terminal device determines that the wireless signal carried by the PDSCH is transmitted, the terminal device may not demodulate the DCI carried by the PDCCH in time, and then the TCI state can be flexibly selected according to the time length of the interval between two PDCCH transmissions. And when the interval between two transmission PDCCHs is small, adopting a first TCI state indicated by the last PDCCH, and otherwise, adopting a second TCI state which is specified in advance. The mode of selecting the TCI state can be more flexible, the selected TCI state has better timeliness, and then when the directional wave beam corresponding to the selected TCI state is adopted to transmit the wireless signal on the PDSCH, the transmission performance of the wireless signal on the PDSCH can be better improved.

The value of the first preset value may be determined by the capability of the terminal device to demodulate DCI carried by the PDCCH, for example, the value of the first preset value may be understood as a time length required by the terminal device to demodulate DCI carried by the PDCCH. The value of the second preset value can be determined according to information such as a channel state of the terminal device.

In one possible design, the network device may pre-define the first preset value, the second preset value, and a preset rule for determining the TCI status with the terminal device. The preset rule for determining the TCI status includes a first TCI status indicated in DCI carried by a PDCCH received last time and a second TCI status specified in advance. Specifically, the network device may send an indication message carrying the second preset value to a terminal device; the network equipment sends an indication message carrying a preset rule for determining the TCI state to the terminal equipment; and the network equipment receives an indication message carrying the first preset value from the terminal equipment. The indication message may be a higher layer signaling, such as Radio Resource Control (RRC) signaling.

In the above design, the network device and the terminal device may select the TCI state used when the radio signal carried by the PDSCH is transmitted in the same manner by pre-specifying the configuration information used when the radio signal is transmitted by the PDSCH, so as to maintain the consistency of the selection results of the network device and the terminal device.

In a second aspect, a method of transmitting radio signals carried by PDSCH is provided, which may be performed by a terminal device. The method comprises the following steps: the terminal equipment determines a first time length, wherein the first time length is the time length of an interval between the terminal equipment receiving the DCI borne by the PDCCH this time and the terminal equipment receiving the DCI borne by the PDCCH last time; when the first time length is smaller than a first preset value, the terminal equipment monitors a wireless signal carried by the PDSCH within a preset time length according to a first TCI state indicated in the DCI carried by the PDCCH received last time; and when the first duration is greater than or equal to the first preset value, the terminal equipment monitors the radio signals carried by the PDSCH within the preset duration according to a second preset TCI state.

The preset time length is the time length required by the terminal equipment to demodulate DCI carried by the PDCCH, and the preset time length, the first preset value and the preset rule for determining the TCI state are predetermined by the terminal equipment and the network equipment; the preset rule for determining the TCI status includes adopting a first TCI status indicated in DCI carried by a PDCCH last time and adopting a second TCI status specified in advance.

In the above method, in order to avoid that the terminal device cannot receive DCI carried by the PDSCH in time in the process of demodulating DCI carried by the PDCCH, the terminal device may predetermine a TCI state according to a duration of an interval between two PDCCH transmissions, and monitor a radio signal carried on the PDSCH according to the predetermined TCI state. Specifically, when the interval between two PDCCH transmissions is small, the terminal device may adopt the first TCI state indicated by the last PDCCH, or conversely adopt the second TCI state specified in advance. The mode of selecting the TCI state is more flexible, and the selected TCI state has better timeliness, so that the transmission performance of the wireless signals on the PDSCH can be better improved when the directional wave beams corresponding to the selected TCI state are adopted to transmit the wireless signals on the PDSCH.

In one possible design, the terminal device may determine whether a radio signal carried by the PDSCH has been monitored within the preset time period; if the terminal equipment monitors the radio signals carried by the PDSCH within the preset time, the terminal equipment continues to receive the radio signals carried by the PDSCH according to the first TCI state or the second TCI state; and if the terminal equipment does not monitor the radio signals carried by the PDSCH within the preset time length, the terminal equipment receives the radio signals carried by the PDSCH according to the TCI state indicated in the DCI carried by the PDCCH received this time.

In the above design, the terminal device determines whether the radio signal carried by the PDSCH has been monitored within the preset duration, and may determine whether to continue to use the first TCI state or the second TCI state after the DCI carried by the PDCCH is successfully demodulated, or to receive the radio signal carried by the PDSCH using the TCI state indicated in the DCI carried by the demodulated PDCCH. The condition that the radio signal carried by the PDSCH has been monitored within the preset time corresponds to the condition that the network device determines that the first time is shorter than the first preset value in the first aspect, and in this case, the network device and the terminal device may synchronously adopt the first TCI state or the second TCI state, which not only can accurately determine the TCI state adopted when the radio signal carried by the PDSCH is received, but also can keep the same as the TCI state adopted by the network device.

In a third aspect, a method of transmitting wireless signals carried by PDSCH is provided and may be performed by a network device, such as a base station. The method comprises the following steps: the network equipment determines that a first time length is smaller than a first preset value, wherein the first time length is the time length of an interval between DCI (downlink control information) carried by the PDCCH (physical downlink control channel) sent by the network equipment at this time and a wireless signal carried by the PDSCH to be sent; and the network equipment sends the radio signal carried by the PDSCH according to the latest updated TCI state in at least one preconfigured TCI state.

In the method, after the network device determines that the first time length is smaller than the first preset value, that is, when the network device determines that the radio signal carried by the PDSCH is transmitted, the terminal device may not demodulate the DCI carried by the PDCCH in time, and may transmit the radio signal carried by the PDSCH according to the latest updated TCI state of the at least one preconfigured TCI state. Since the TCI state is generally updated based on the measurement results of the downlink reference signals, the downlink reference signals with better measurement results are selected from the measurement results to update the TCI state, so that the updated TCI state can better adapt to the current channel state. Therefore, by adopting the latest updated TCI state, it is possible to determine that the directional beam used for transmitting the wireless signal on the PDSCH is better, and the transmission performance of the wireless signal on the PDSCH can be improved.

In a possible design, the network device may indicate the preconfigured at least one TCI status of the terminal device in advance through high-layer signaling, and update a manner of any one TCI status of the at least one TCI status. The higher layer signaling is, for example, RRC signaling. In this way, the network device and the terminal device may select the TCI state in the same manner, so that the TCI states used when transmitting the radio signal carried by the PDSCH are kept consistent.

In one possible design, after updating the TCI status to be updated in the at least one preconfigured TCI status, the network device may also instruct the terminal device to update the TCI status to be updated. The specific indication manner may be indicated by higher layer signaling, for example, RRC signaling or Media Access Control (MAC) signaling. Therefore, the network equipment can indicate the terminal equipment to synchronously update the TCI state, so that the TCI states of the terminal equipment and the TCI state which are updated last time can be kept consistent, and the reliability is improved.

In a fourth aspect, a method of transmitting radio signals carried by PDSCH is provided, which may be performed by a terminal device. The method comprises the following steps: and the terminal equipment monitors the radio signal carried by the PDSCH within a preset time according to the latest updated TCI state in at least one preconfigured TCI state.

The preset time length is the time length required by the terminal equipment for demodulating DCI carried by the PDCCH; the preset duration, the at least one TCI state and the manner of updating any one TCI state in the at least one TCI state by the terminal equipment are predetermined by the terminal equipment and the network equipment.

In the above method, in order to avoid that the terminal device cannot receive DCI carried by the PDSCH in time in the process of demodulating DCI carried by the PDCCH, the terminal device may further select a TCI state from preconfigured TCI states to monitor a radio signal carried on the PDSCH. Because the TCI state is generally updated based on the measurement result of the downlink reference signal, the downlink reference signal with a better measurement result is selected from the measurement result to update the TCI state, and therefore, the TCI state updated last time is adopted, the current channel state can be better adapted, so that the directional beam for transmitting the wireless signal on the PDSCH is determined to be better, and the transmission performance of the wireless signal on the PDSCH is improved.

In one possible design, the terminal device may determine whether a radio signal carried by the PDSCH has been monitored within the preset time period; if the terminal equipment monitors the radio signals carried by the PDSCH within the preset time length, the terminal equipment continues to receive the radio signals carried by the PDSCH according to the latest updated TCI state; and if the terminal equipment does not monitor the radio signals carried by the PDSCH within the preset time length, the terminal equipment receives the radio signals carried by the PDSCH according to the TCI state indicated in the DCI carried by the PDCCH received this time.

In a fifth aspect, a method of transmitting wireless signals carried by a PDSCH is provided and may be performed by a network device, such as a base station. The method comprises the following steps: the network equipment determines that a first time length is smaller than a first preset value, wherein the first time length is the time length of an interval between DCI (downlink control information) carried by the PDCCH (physical downlink control channel) sent by the network equipment at this time and a wireless signal carried by the PDSCH to be sent; the network equipment selects a preset rule from a preset rule set; the preset rule set comprises at least two preset rules, and each preset rule is used for determining the TCI state; and the network equipment sends the wireless signals carried by the PDSCH according to the TCI state determined by the selected preset rule.

In the method, after the network device determines that the first time length is smaller than the first preset value, that is, when the network device determines that the terminal device may not demodulate the DCI carried by the PDCCH in time when transmitting the wireless signal carried by the PDSCH, one preset rule may be flexibly selected from the preset rule set to determine the TCI state, so that when the wireless signal carried by the PDSCH is transmitted according to the determined TCI state, the network device may better adapt to the current channel state, and improve the transmission performance of the wireless signal on the PDSCH.

The network device and the terminal device may pre-define the first preset value, the preset rule set, and select one preset rule from the preset rule set, so that the preset rules selected by the network device and the terminal device are consistent. Specifically, the network device may indicate the preset rule set to the terminal device through a high-level signaling, and select a preset rule from the preset rule set. The terminal device may indicate the first preset value to the network device through a high-level signaling.

In a possible design, before the network device selects one preset rule from a preset rule set, it may further create a preset rule set including the at least two preset rules, and send an indication message to the terminal device, where the indication message includes the preset rule set including the at least two preset rules and a manner of selecting one preset rule from the preset rule set. The indication message may be higher layer signaling, for example, RRC signaling.

The indication message may further include priorities set for the at least two preset rules; wherein, according to the TCI states determined by the preset rules with different priorities, the transmission quality is different when the wireless signals carried by the PDSCH are transmitted. Therefore, the network equipment selects preset rules with different priorities according to actual requirements.

In one possible design, the preset rule set may include at least two preset rules: adopting a first TCI state indicated in DCI carried by the PDCCH sent last time; adopting a second pre-specified TCI state; the latest updated TCI state of the preconfigured at least one TCI state is employed.

Considering that the channel may have obvious change under the condition that the time interval between the current sending of the DCI carried by the PDCCH and the last sending of the DCI carried by the PDCCH is long, if the TCI state indicated in the last PDCCH carrying DCI is continuously used, it may be difficult to adapt to the current channel condition, so another possible design is provided.

In another possible design, the preset rule set may further include:

determining the TCI state according to the second duration; when the second duration is less than a second preset value, adopting a first TCI state indicated in the DCI carried by the PDCCH last time, and when the second duration is greater than or equal to the second preset value, adopting a second TCI state specified in advance; the second duration is the duration of an interval between the network equipment sending the DCI carried by the PDCCH this time and the network equipment sending the DCI carried by the PDCCH last time;

the latest updated TCI state of the preconfigured at least one TCI state is employed.

In the above design, by configuring at least two preset rules in the preset rule set, the network device may select a required preset rule from the preset rule set according to actual requirements, so that when a radio signal carried by the PDSCH is transmitted according to a determined TCI state, the current channel state may be better adapted, and the transmission performance is better.

In one possible design, the network device may select a preset rule from a preset rule set, where the preset rule is selected from the preset rule set. And, the preset rule configured in advance can be notified to the terminal device through high-level signaling or dynamic signaling. The higher layer signaling is RRC signaling, for example, and the dynamic signaling is DCI, for example. Specifically, the preset rule configured in advance may be a preset rule that specifies to use a certain default, or a preset rule that specifies to use a certain priority. The specific preset rule which is configured in advance can be determined according to actual requirements.

The above design can be applied to the case where one preset rule is selected from the preset rule set for the first time. In this case, the network device and the terminal device use the preset rule configured in advance, so that the preset rules adopted when the network device and the terminal device transmit the radio signal carried by the PDSCH can be kept consistent.

In another possible design, the network device may select one preset rule from a preset rule set according to the reception quality information fed back by the terminal device when receiving the radio signal carried by the PDSCH for the previous N times, where N is an integer greater than zero.

Specifically, the network device may determine, according to the reception quality information fed back by the terminal device when receiving the radio signal borne by the PDSCH for the previous N times, a handover condition that satisfies a preset rule, and then the network device may select one preset rule from second preset rules in the preset rule set, where the second preset rule is other than a first preset rule, and the first preset rule is a preset rule selected from the preset rule set last time. When the network device selects one preset rule from second preset rules in the preset rule set except for the first preset rule, the network device may select one preset rule from the second preset rules according to the priority of the second preset rule, and the transmission quality is different when transmitting the radio signal carried by the PDSCH according to the TCI state determined by the preset rules with different priorities in the application.

Wherein the reception quality information includes at least one of: acknowledgement (ACK) and/or Negative Acknowledgement (NACK) characters fed back by the terminal device in the process of receiving the radio signal carried by the PDSCH; the terminal device measures a Reference Signal Receiving Power (RSRP) or a Channel Quality Indicator (CQI) of a reference signal on the PDSCH.

The switching condition of the preset rule is any one of the following conditions: the number of times of the ACK is less than a first preset number of times; the number of times of the NACK is greater than or equal to a second preset number of times; the average value of the RSRP is smaller than a first preset average value; the average value of the CQI is smaller than a second preset average value; the number of times that the RSRP is smaller than the first preset threshold is larger than a third preset number of times; and the times that the CQI is smaller than the second preset threshold value are larger than the fourth preset times.

The above design can be applied to a situation where one preset rule is selected from the preset rule set for a non-first time. In this case, when the network device selects the preset rule each time, the transmission quality condition of the radio signal carried by the PDSCH transmitted last time may be considered, so that the TCI state determined by the selected preset rule may better meet the current channel state condition, and achieve better transmission performance.

In a sixth aspect, a method of transmitting radio signals carried by PDSCH is provided, which may be performed by a terminal device. The method comprises the following steps: the terminal equipment selects a preset rule from a preset rule set; the preset rule set comprises at least two preset rules, each preset rule is used for determining a TCI state, and further, the terminal device monitors a radio signal carried by the PDSCH within a preset time according to the TCI state determined by the selected preset rule.

The preset time length is the time length required by the terminal equipment for demodulating DCI carried by the PDCCH; the preset duration, the preset rule set and a mode of selecting one preset rule from the preset rule set are predetermined by the terminal equipment and the network equipment.

In the method, in order to avoid that the terminal device cannot receive DCI carried by the PDSCH in time in the process of demodulating DCI carried by the PDCCH, the terminal device may further select a preset rule from a preset rule set agreed with the network device in advance, and monitor the PUSCH according to the selected preset rule. By configuring the preset rule set, the preset rule can be flexibly selected from the preset rule set, so that when the wireless signal carried by the PDSCH is transmitted according to the determined TCI state, the current channel state can be better adapted, and the transmission performance is better.

In one possible design, the terminal device may determine whether a radio signal carried by the PDSCH has been monitored within the preset time period; if the terminal equipment monitors the radio signals carried by the PDSCH within the preset time, the terminal equipment continues to receive the radio signals carried by the PDSCH according to the TCI state determined by the selected preset rule; and if the terminal equipment does not monitor the radio signals carried by the PDSCH within the preset time length, the terminal equipment receives the radio signals carried by the PDSCH according to the TCI state indicated in the DCI carried by the PDCCH received this time.

In the above design, the terminal device determines whether the radio signal carried by the PDSCH has been monitored within the preset duration, and may determine whether to continue to follow the TCI state determined by the selected preset rule after the DCI carried by the PDCCH is successfully demodulated, or to receive the radio signal carried by the PDSCH by using the TCI state indicated in the DCI carried by the demodulated PDCCH. In this case, the network device and the terminal device may synchronously adopt the TCI state determined by the selected preset rule, which not only can accurately determine the TCI state adopted when receiving the radio signal carried by the PDSCH, but also can keep consistent with the TCI state used by the network device.

In one possible design, the preset rule set includes at least two preset rules: adopting a first TCI state indicated in DCI carried by the PDCCH received last time; adopting a second pre-specified TCI state; the latest updated TCI state of the preconfigured at least one TCI state is employed.

In another possible design, the preset rule set includes:

determining the TCI state according to the first time length; when the first duration is less than a first preset value, adopting a first TCI state indicated in DCI carried by the PDCCH last time, and when the first duration is greater than or equal to the first preset value, adopting a second TCI state specified in advance; the first duration is the duration of an interval between the terminal equipment receiving the DCI carried by the PDCCH this time and receiving the DCI carried by the PDCCH last time;

Each preset rule in the preset rule set may correspond to a priority, and the transmission quality when transmitting the radio signal carried by the PDSCH is different according to the TCI state determined by the preset rules of different priorities.

In one possible design, the terminal device may select a preset rule from a preset rule set, where the preset rule is predetermined by the terminal device and the network device.

In another possible design, the terminal device may select one preset rule from a preset rule set according to the reception quality information when receiving the radio signal carried by the PDSCH for the previous N times, where N is an integer greater than zero.

Specifically, the terminal device may determine a handover condition that satisfies a preset rule according to reception quality information obtained when receiving the radio signal carried by the PDSCH for the previous N times, and then the terminal device selects one preset rule from second preset rules in the preset rule set, where the second preset rule is different from the first preset rule, and the first preset rule is a preset rule selected from the preset rule set last time. When the terminal device selects one preset rule from second preset rules in the preset rule set except for the first preset rule, the terminal device may select one preset rule from the second preset rules according to the priority of the second preset rules. According to the TCI states determined by the preset rules with different priorities, the transmission quality is different when the wireless signals borne by the PDSCH are transmitted.

Wherein the reception quality information includes at least one of: the terminal equipment feeds back a correct response instruction ACK and/or an error response instruction NACK in the process of receiving the wireless signal carried by the PDSCH; the terminal device measures a reference signal received power, RSRP, or a channel quality indication, CQI, of a reference signal on the PDSCH.

The above design can be applied to a situation where one preset rule is selected from the preset rule set for a non-first time. In this case, when the terminal device selects the preset rule each time, the transmission quality condition of the radio signal carried by the PDSCH transmitted last time may be considered, so that the TCI state determined by the selected preset rule may better meet the current channel state condition, and achieve better transmission performance.

A seventh aspect provides a communication apparatus, wherein the communication apparatus has a function of implementing the network device according to the first aspect, and the function may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

In a possible design, the communication apparatus includes a processing unit and a transceiver unit, and functions performed by the processing unit and the transceiver unit may correspond to the method performed by the network device in the first aspect and any possible design of the first aspect, which is not described herein again.

In another possible design, the communication apparatus includes a processor and a transceiver, and the processor may control the transceiver to send and receive signals to perform the method performed by the network device in the first aspect and any possible design of the first aspect.

The apparatus may further comprise one or more memories for coupling with the processor, which stores the necessary computer program instructions and/or data to implement the functions of the network device as referred to in the first aspect above and in any possible design of the first aspect. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited. The processor may execute the computer program instructions stored in the memory to perform the method performed by the network device of the first aspect described above and any possible design of the first aspect.

An eighth aspect provides a communication apparatus, wherein the communication apparatus has a function of implementing the terminal device according to the second aspect, and the function may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

In a possible design, the communication apparatus includes a processing unit and a transceiver unit, and functions performed by the processing unit and the transceiver unit may correspond to the method performed by the terminal device in the second aspect and any possible design of the second aspect, which is not described herein again.

In another possible design, the communication apparatus includes a processor and a transceiver, and the processor may control the transceiver to transmit and receive signals to perform the method performed by the terminal device in the second aspect and any possible design of the second aspect.

The apparatus may further comprise one or more memories for coupling with the processor, which stores the necessary computer program instructions and/or data for implementing the functions of the terminal device as referred to in the second aspect above and in any possible design of the second aspect. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited. The processor may execute the computer program instructions stored in the memory to perform the method performed by the terminal device in the second aspect described above and in any possible design of the second aspect.

A ninth aspect provides a communication apparatus, wherein the communication apparatus has a function of implementing the network device according to the third aspect, and the function may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

In a possible design, the communication apparatus includes a processing unit and a transceiver unit, and functions performed by the processing unit and the transceiver unit may correspond to the method performed by the network device in the third aspect and any possible design of the third aspect, which is not described herein again.

In another possible design, the communication apparatus includes a processor and a transceiver, and the processor may control the transceiver to send and receive signals to perform the method performed by the network device in the third aspect and any possible design of the third aspect.

The apparatus may further comprise one or more memories for coupling with the processor, which stores the necessary computer program instructions and/or data to implement the functions of the network device as referred to in the third aspect above and in any possible design of the third aspect. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited. The processor may execute the computer program instructions stored in the memory to perform the method performed by the network device in the third aspect and any possible design of the third aspect.

A tenth aspect provides a communication apparatus, wherein the communication apparatus has a function of implementing the terminal device according to the fourth aspect, and the function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

In a possible design, the communication apparatus includes a processing unit and a transceiver unit, and functions performed by the processing unit and the transceiver unit may correspond to the method performed by the terminal device in the fourth aspect and any possible design of the fourth aspect, which is not described herein again.

In another possible design, the communication apparatus includes a processor and a transceiver, and the processor may control the transceiver to send and receive signals to and from the terminal device, thereby implementing the method performed by the terminal device in the fourth aspect and any possible design of the fourth aspect.

The apparatus may further comprise one or more memories for coupling with the processor, which stores the necessary computer program instructions and/or data for implementing the functions of the terminal device as referred to in the fourth aspect above and in any possible design of the fourth aspect. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited. The processor may execute the computer program instructions stored in the memory to perform the method performed by the terminal device in the fourth aspect and any possible design of the fourth aspect.

An eleventh aspect provides a communication apparatus, wherein the communication apparatus has a function of implementing the network device according to the fifth aspect, and the function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

In a possible design, the communication apparatus includes a processing unit and a transceiver unit, and functions performed by the processing unit and the transceiver unit may correspond to the method performed by the network device in the fifth aspect and any possible design of the fifth aspect, which is not described herein again.

In another possible design, the communication device includes a processor and a transceiver, and the processor may control the transceiver to transmit and receive signals to perform the method performed by the network device in the fifth aspect and any possible design of the fifth aspect.

The apparatus may further comprise one or more memories for coupling with the processor, which stores the necessary computer program instructions and/or data to implement the functions of the network device as referred to in the fifth aspect above and in any possible design of the fifth aspect. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited. The processor may execute the computer program instructions stored in the memory to perform the method performed by the network device of the fifth aspect described above and any possible design of the fifth aspect.

A twelfth aspect provides a communication apparatus having a function of implementing the terminal device according to the sixth aspect, where the function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

In a possible design, the communication apparatus includes a processing unit and a transceiver unit, and functions performed by the processing unit and the transceiver unit may correspond to the method performed by the terminal device in any possible design of the sixth aspect and the sixth aspect, which is not described herein again.

In another possible design, the communication apparatus includes a processor and a transceiver, and the processor may control the transceiver to send and receive signals to implement the method performed by the terminal device in the sixth aspect and any possible design of the sixth aspect.

The apparatus may further comprise one or more memories for coupling with the processor, which stores the necessary computer program instructions and/or data for implementing the functions of the terminal device as referred to in the sixth aspect above and in any possible design of the sixth aspect. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited. The processor may execute the computer program instructions stored in the memory to perform the method performed by the terminal device in the sixth aspect and any possible design of the sixth aspect.

In a thirteenth aspect, a communication system is provided, which includes the network device of the first aspect, and at least one terminal device of the second aspect; or, the network device according to the third aspect and the terminal device according to the at least one fourth aspect are included; alternatively, the network device according to the fifth aspect and at least one terminal device according to the sixth aspect are included.

A fourteenth aspect provides a chip, which can be connected to a memory, and is configured to read and execute a program code stored in the memory, so as to implement the method according to the first aspect and any possible design of the first aspect, or the method according to the terminal device in any possible design of the second aspect and the second aspect, or the method according to the network device in any possible design of the third aspect and the third aspect, or the method according to the terminal device in any possible design of the fourth aspect and the fourth aspect, or the method according to the network device in any possible design of the fifth aspect and the fifth aspect, or the method according to the terminal device in any possible design of the sixth aspect and the sixth aspect.

A fifteenth aspect provides a computer storage medium for storing a program or instructions, which, when run on a computer, performs the method according to the first aspect and any possible design of the first aspect, or the method according to the second aspect and any possible design of the second aspect, or the method according to the third aspect and any possible design of the third aspect, or the method according to the fourth aspect and any possible design of the fourth aspect, or the method according to the fifth aspect and any possible design of the fifth aspect, or the method according to the sixth aspect and any possible design of the sixth aspect.

Drawings

FIG. 1 is a schematic diagram of a possible network architecture provided herein;

fig. 2 is a schematic diagram of a scheduling offset provided in the present application;

fig. 3 is a flowchart illustrating a method for transmitting wireless signals through a PDSCH according to an embodiment of the present application;

fig. 4a is a first specific scenario diagram provided in the first embodiment of the present application;

fig. 4b is a schematic diagram of a specific scenario provided in the first embodiment of the present application;

fig. 5 is a flowchart illustrating a method for transmitting a wireless signal through a PDSCH according to a second embodiment of the present application;

fig. 6 is a schematic diagram of a specific scenario provided in the second embodiment of the present application;

fig. 7 is a flowchart illustrating a method for transmitting a wireless signal through a PDSCH according to a third embodiment of the present application;

fig. 8a is a schematic view of a specific scenario provided in the third embodiment of the present application;

fig. 8b is a schematic diagram of a specific scenario provided in the third embodiment of the present application;

fig. 9 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 16 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 17 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 18 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 19 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 20 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings.

Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

(1) A network device is a device in an access network that communicates with a terminal device over an air interface. The network device includes, but is not limited to, a Radio Access Network (RAN) device, such as a base station, and specifically, the base station may refer to a base station in a Long Term Evolution (LTE) system or an evolved LTE system (LTE-advanced, LTE-a), such as a Node B (NodeB, NB), an evolved Node B (evolved Node B, eNB), or may also be a next generation Node B (neighbor Node B, gNB) in a fifth generation mobile communication technology (5G) New Radio (NR) system.

(2) A terminal device, which is a device providing voice and/or data connectivity to a user, may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, drones or other processing devices connected to wireless modems, as well as various forms of User Equipment (UE), Mobile Stations (MS), terminals (terminal equipment), transmission and reception points (TRP or transmission point, TP), and the like.

(3) The transmission configuration indication TCI may be divided into a plurality of states, and each TCI state may represent that a demodulation reference signal (DMRS) of the PDSCH and at least one downlink reference signal satisfy a spatial-co-location (QCL) relationship. The downlink reference signal may be, for example, a channel state information reference signal (CSI-RS). It should be understood that, when the DMRS of the PDSCH and the downlink reference signal have a QCL relationship, the transceiving beam of the wireless signal carried by the PDSCH and the transceiving beam of the downlink reference signal are the same in direction. For the network device, the directional beam used when the downlink reference signal is transmitted may be used as the directional beam used when the radio signal carried by the PDSCH is transmitted, and for the terminal device, the directional beam used when the downlink reference signal is received may be used as the directional beam used when the radio signal carried by the PDSCH is received. For example, if the TCI [00] state indicates that the DMRS of the PDSCH and the CSI-RS #1 satisfy the QCL relationship, the transceiving beam of the radio signal carried by the PDSCH is the same as the transceiving beam of the CSI-RS # 1. Therefore, based on the QCL relationship represented by each TCI state, the terminal device can deduce which receiving beam is used to receive the wireless signal carried by the PDSCH, and the network device can also deduce which transmitting beam is used to transmit the wireless signal carried by the PDSCH.

4) The terms "system" and "network" in the embodiments of the present application may be used interchangeably; "a plurality" means two or more, and in view of this, a plurality may also be understood as "at least two" in the embodiments of the present application; "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone; and, unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing a plurality of objects, and do not limit the sequence, timing, priority, or importance of the plurality of objects.

It should be understood that, for convenience of description in this embodiment of the present application, a duration of an interval between DCI carried by a PDCCH being sent by a network device this time and a radio signal carried by a PDSCH to be sent is referred to as a duration a, and a duration of an interval between DCI carried by a PDCCH being sent by the network device this time and DCI carried by a PDCCH being sent last time, and a duration of an interval between DCI carried by a PDCCH being received by a terminal device this time and DCI carried by a PDCCH being received last time are referred to as a duration B. The preset value for judging the size of the duration A is called a preset value A, and the preset value for judging the size of the duration B is called a preset value B.

In order to better understand the technical solutions provided in the embodiments of the present application, an application scenario of the embodiments of the present application is first described below.

Fig. 1 illustrates a schematic diagram of a possible network architecture provided in the embodiment of the present application, where the network architecture is applicable to an LTE system and also applicable to a 5G NR system, and as a communication system evolves, the network architecture in the embodiment of the present application is also applicable to other similar communication systems. The network architecture shown in fig. 1 includes network devices (e.g., base stations) and terminal devices. The terminal device may communicate with the network device for access to a wireless network or with other terminal devices via the network device. The process of transmitting a wireless signal from a terminal device to a network device is called uplink transmission, and the process of transmitting a wireless signal from a network device to a terminal device is called downlink transmission. For downlink transmission, the network device may first send a downlink scheduling instruction, where the downlink scheduling instruction is used to instruct the terminal device to receive downlink data at which resource locations, and then the network device sends the downlink data, and the terminal device may receive the downlink data at the resource locations indicated by the received downlink scheduling instruction.

In the 5G NR system, the network device may transmit DCI through the PDCCH to implement a downlink scheduling process, and then transmit downlink data through the PDSCH. Since the radio signals carried by the PDCCH, the radio signals carried by the PDSCH, and the reference signals in the 5G NR system are all transmitted by using directional beams, when the network device and the terminal device transmit the radio signals through the PDCCH or the PDSCH, the directional beams used for transmitting the radio signals need to be determined first.

The present application generally relates to a process of determining a directional beam used for transmitting a wireless signal when a network device and a terminal device transmit the wireless signal through a PDSCH. Specifically, the network device may determine the directional beam used for transmitting the radio signal carried by the PDSCH by determining whether a duration a of an interval between the DCI carried by the PDCCH and the radio signal carried by the PDSCH to be transmitted is smaller than a preset value a. The duration a is the scheduling offset (scheduling offset) shown in fig. 2. The preset value a may be determined according to the capability of the terminal device to demodulate DCI carried by the PDCCH.

When the duration a is greater than or equal to the preset value a, it can be shown that the terminal device may have enough time to demodulate DCI carried by the PDCCH to obtain the TCI state before receiving the radio signal carried by the PDSCH, so the following manner may be adopted in this case:

the network device may determine a transmission beam used for transmitting the wireless signal through the PDSCH according to the TCI status indicated in the DCI carried by the PDCCH, and the terminal device may also determine a reception beam used for receiving the wireless signal through the PDSCH according to the TCI status indicated in the DCI carried by the PDCCH.

When the duration a is less than the preset value a, it may be indicated that the terminal device may not demodulate DCI carried by the PDCCH in time to obtain the TCI state before receiving the radio signal carried by the PDSCH, and therefore, in this case, the beam used when sending and receiving the radio signal through the PDSCH may be determined between the network device and the terminal device according to a preset rule for determining the TCI state, which is predetermined.

Specifically, the preset rule may be: the TCI status configured in the control resource element set (CORESET) is adopted.

Specifically, the network device may configure a TCI state for the CORESET of the terminal device through the high-level instruction, and when monitoring the CORESET, the terminal device may determine a receiving beam used for receiving the DCI carried by the PDCCH according to the TCI state configured in the CORESET. Further, when the duration a is less than the preset value a, the network device may determine, according to the TCI state configured in the CORESET, a transmit beam used when transmitting the radio signal carried by the PDSCH, and the terminal device may also determine, according to the TCI state configured in the CORESET, a receive beam used when receiving the radio signal carried by the PDSCH.

However, since the directional beam determined according to the TCI state configured in CORESET is generally a wide beam, and a high transmission rate cannot be generally achieved when such a wide beam is used, if the TCI state configured in CORESET is always adopted by default, the transmission rate of the wireless signal on the PDSCH may be limited.

Specifically, the preset rule may also be: and adopting the TCI state which is pre-configured by the network equipment through high-layer signaling. The higher layer signaling is, for example, RRC signaling. Specifically, the network device may send an RRC signaling to the terminal device in advance, where the RRC signaling carries a preconfigured TCI state, and when the duration a is smaller than the preset value a, the network device may determine, according to the preconfigured TCI state, a transmission beam used when the radio signal carried by the PDSCH is sent, and the terminal device may also determine, according to the preconfigured TCI state, a reception beam used when the radio signal carried by the PDSCH is received.

However, since the process of configuring the TCI state by the network device through the high-level signaling is a relatively long-term process, the network device does not change the preconfigured TCI state for a long time after configuring a TCI state in advance, and only can fixedly adopt the preconfigured TCI state. Thus, it may be difficult to adapt to actual channel variation conditions by using a fixed TCI state for a long time, so that the transmission quality of wireless signals transmitted through the PDSCH is poor.

Specifically, the preset rule may also be: and adopting the TCI state indicated in the DCI carried by the PDCCH at the last time. Specifically, when the duration a is less than the preset value a, the network device may determine, according to the TCI status indicated in the DCI carried by the PDCCH last time, a transmission beam used for transmitting the radio signal carried by the PDSCH, and the terminal device may also determine, according to the TCI status indicated in the DCI carried by the PDCCH last time, a reception beam used for receiving the radio signal carried by the PDSCH.

However, when the time interval between the current sending of the DCI carried by the PDCCH and the last sending of the DCI carried by the PDCCH is long, since the channel may have obvious changes, if the TCI state indicated in the last sending of the DCI carried by the PDCCH is continuously used, it may be difficult to adapt to the current channel condition, resulting in poor transmission quality of the wireless signal transmitted through the PDSCH.

It can be seen from the introduction of the preset rules that each preset rule has a certain disadvantage in use, and in practical application, if a network device and a terminal are pre-defined to adopt one preset rule and fixedly adopt the TCI state determined by the preset rule, transmission of wireless signals on the PDSCH is realized, and the transmission performance of the wireless signals on the PDSCH is likely to be poor. Based on this, embodiments of the present application provide a method and an apparatus for transmitting a wireless signal through a PDSCH, which may flexibly select a preset rule for determining a TCI state between a network device and a terminal device, and may dynamically update the selected preset rule according to an actual situation, so as to better adapt to an actual channel change situation and improve transmission quality when transmitting a wireless signal through the PDSCH.

In the following, the technical solutions provided by the embodiments of the present application are described in detail with reference to the application scenarios of the embodiments of the present application introduced above.

Referring to fig. 3, a method for transmitting a wireless signal through a PDSCH is provided in an embodiment of the present application. The method comprises the following description flow:

step 301: the network equipment and the terminal equipment agree in advance configuration information used when transmitting wireless signals through the PDSCH, wherein the configuration information comprises a preset value A, a preset value B and a preset rule used for determining the TCI state.

Wherein the preset rules for determining the TCI status include: the method comprises the steps of adopting a first TCI state indicated in DCI carried by a last PDCCH and adopting a second TCI state specified in advance. The second pre-specified TCI state may be set to a TCI state configured in CORESET, or to a TCI state pre-configured by the network device through higher layer signaling.

The preset value a is a threshold of the duration a, and may be used as a condition for determining whether the TCI state indicated in the DCI carried by the PDCCH of this time may be adopted. Specifically, the value of the preset value a may be determined by the capability of the terminal device to demodulate DCI carried by the PDCCH, where the preset value a may be understood as a time length required by the terminal device to demodulate DCI carried by the PDCCH. When the duration a is greater than or equal to the preset value a, it can be shown that the terminal device can have enough time to demodulate the DCI carried by the PDCCH this time to obtain the TCI state before receiving the radio signal carried by the PDSCH, so that the network device and the terminal device can adopt the DCI carried by the PDCCH this time; when the duration a is less than the preset value a, it may be indicated that the terminal device may not demodulate the DCI carried by the PDCCH in time to obtain the TCI state before receiving the radio signal carried by the PDSCH, so that the network device and the terminal device may select one preset rule from preset rules for determining the TCI state.

The preset value B is a threshold of the duration B, and may be used as a condition for determining whether the first TCI state indicated in the DCI carried by the PDCCH last time may be adopted. The preset value B may be configured as an integer, and the unit may be a slot (slot). For example, when the preset value B is configured to be 2, it may represent a duration of 2 slots. When the duration B is greater than or equal to the preset value B, that is, the interval between two times of sending the DCI carried by the PDCCH by the network device is long, the channel state change of the terminal device may be obvious, so that the first TCI state indicated in the DCI carried by the PDCCH last time is adopted, which may not be suitable for the current channel state. On the contrary, when the duration B is less than the preset value B, that is, when the interval between two times of sending the DCI carried by the PDCCH by the network device is short, the change of the channel state of the terminal device may not be large, so that the first TCI state indicated in the DCI carried by the PDCCH last time is adopted, and the current channel state condition can be better adapted.

Specifically, the value of the preset value B may be determined according to information such as a channel state of the terminal device, for example, the preset value B is updated at intervals according to a change condition of the channel state. For example, the network device may infer whether a channel state of the terminal device changes according to a Channel State Information (CSI) report periodically reported by the terminal device, and if the CSI reported by the UE does not change significantly within a period of time, the network device may configure the preset value B to a larger value and indicate the larger value to the terminal device, and if the CSI reported by the UE changes significantly within a period of time, the network device may configure the preset value B to a smaller value and indicate the smaller value to the terminal device. In practical application, under some extreme conditions, such as a severe change of the UE channel state, the preset value B may be configured to be zero, which indicates that the TCI state indicated by the DCI carried by the PDCCH last time cannot be used as the TCI state adopted when the radio signal carried by the PDSCH is transmitted this time.

In specific implementation, the network device and the terminal device may agree in advance on configuration information such as a preset value a, a preset value B, and a preset rule for determining the TCI state in various ways, for example, the network device may indicate the preset rule for determining the TCI state and the preset value B through a high-level instruction (e.g., an RRC instruction), and the terminal device determines the preset value a according to the capability of itself to demodulate DCI carried by the PDCCH, and reports the preset value a to the network device. For another example, the other device may also instruct the network device and the terminal device to use configuration information when transmitting wireless signals through the PDSCH, and the like.

After the configuration information used when the radio signal is transmitted through the PDSCH is defined, the network device and the terminal device may determine which method to transmit the radio signal through the PDSCH based on the configuration information used when the radio signal is transmitted through the PDSCH, which is defined in advance, if downlink data transmission is required subsequently. The embodiment of the application mainly relates to a process of transmitting a wireless signal through a PDSCH under the condition that the time length A is less than a preset value A. Step 302 to step 305 are processes of the network device transmitting wireless signals through the PDSCH, and step 306 to step 311 are processes of the terminal device transmitting wireless signals through the PDSCH. Specifically, the network device may perform step 302 to step 305 after sending the DCI carried by the PDCCH, and the terminal device may perform step 306 to step 311 after receiving the DCI carried by the PDCCH.

Step 302: the network equipment determines that the duration A is less than a preset value A.

In this case, before receiving the radio signal carried by the PDSCH, the terminal device may not be able to demodulate the DCI carried by the PDCCH in time to obtain the TCI state, so the network device may select a preset rule from preset rules for determining the TCI state. Which of the preset rules is specifically selected may be determined according to whether the determined duration B is less than the preset value B.

Step 303: the network device determines duration B. When the duration B is less than the preset value B, executing step 304; when the duration B is greater than or equal to the preset value B, step 305 is executed.

Step 304: and the network equipment transmits the radio signal carried by the PDSCH according to the first TCI state indicated in the DCI carried by the PDCCH transmitted last time.

Specifically, the first TCI state may characterize that the DMRS of the PDSCH and the first downlink reference signal satisfy a QCL relationship. The network device may determine, through the first TCI state, that a transmission beam used for transmitting a radio signal carried by the PDSCH is a transmission beam used for transmitting the first downlink reference signal, and then the network device may transmit the radio signal carried by the PDSCH through the determined transmission beam.

Step 305: and the network equipment sends the radio signals carried by the PDSCH according to the second TCI state which is specified in advance.

Specifically, the second TCI state may indicate that the DMRS of the PDSCH and the second downlink reference signal satisfy a QCL relationship. The network device may determine, through the second TCI state, that a transmission beam used for transmitting the radio signal carried by the PDSCH is a transmission beam used for transmitting the second downlink reference signal, and then the network device may transmit the radio signal carried by the PDSCH through the determined transmission beam.

For the terminal device, after receiving the DCI carried by the PDCCH, the terminal device needs to consume a certain time to demodulate the DCI carried by the PDCCH, and it is assumed here that a time length required for the terminal device to demodulate the DCI carried by the PDCCH is a preset time length, that is, the preset value a, and then, in order to monitor whether a radio signal is transmitted on the PDSCH, the terminal device may select a preset rule from preset rules for determining a TCI state, which are predetermined with the network device, and monitor the PDSCH according to the selected preset rule. See step 306-step 311 for details.

Step 306: the terminal device determines the duration B. When the duration B is less than the preset value B, executing step 307; when the duration B is greater than or equal to the preset value B, step 308 is executed.

Step 307: and the terminal equipment monitors the radio signal carried by the PDSCH within a preset time according to the first TCI state indicated in the DCI carried by the PDCCH received last time.

Specifically, as described in step 304, the first TCI state indicates that the DMRS of the PDSCH and the first downlink reference signal satisfy the QCL relationship, and the terminal device may determine, through the first TCI state, that the receiving beam used for receiving the wireless signal carried by the PDSCH is the receiving beam used for receiving the first downlink reference signal, and then the terminal device may monitor the wireless signal carried by the PDSCH by using the determined receiving beam.

Step 308: and the terminal equipment monitors the radio signals carried by the PDSCH within a preset time according to the second TCI state appointed in advance.

As for the process of the terminal device determining the receiving beam to receive the radio signal carried by the PDSCH through the second TCI state, reference may be made to the content described in step 307 above, and details are not described here.

Step 309: and the terminal equipment determines whether the wireless signals carried by the PDSCH are monitored in the preset time length.

If the terminal device has monitored the radio signal carried by the PDSCH within the preset time, continuing to execute step 310; otherwise, if the terminal device does not monitor the radio signal carried by the PDSCH within the preset time period, step 311 is executed.

Step 310: and the terminal equipment continues to receive the wireless signals carried by the PDSCH according to the first TCI state or the second TCI state.

Step 311: and the terminal equipment receives the wireless signal carried by the PDSCH according to the TCI state indicated in the DCI carried by the PDCCH received this time.

Specifically, since the DCI carried by the PDCCH includes a time domain resource location for instructing the terminal device to receive the radio signal carried by the PDSCH and a TCI state for instructing a receiving beam used by the terminal device to receive the radio signal carried by the PDSCH, the terminal device usually cannot confirm when the terminal device can start receiving the radio signal carried by the PDSCH and what receiving beam is used to receive the radio signal carried by the PDSCH before demodulating the DCI carried by the PDCCH. Therefore, in the embodiment of the present application, in the process of demodulating DCI carried by a PDCCH by the terminal device, that is, the terminal device may monitor a radio signal carried by a PDSCH by determining the first TCI state or the second TCI state within a preset time period. After the terminal device demodulates the DCI carried by the PDCCH, if the terminal device does not monitor the radio signal carried by the PDSCH yet, the terminal device may further monitor the radio signal carried by the PDSCH by using the TCI status indicated in the DCI carried by the PDCCH. After the terminal device demodulates the DCI carried by the PDCCH, if the terminal device monitors the radio signal carried by the PDSCH according to the first TCI state or the second TCI state, the terminal device may not switch the TCI state, and continue to use the first TCI state or the second TCI state. Therefore, the TCI state adopted when the radio signal carried by the PDSCH is received can be accurately determined, and the TCI state can be synchronized with the TCI state used by the network equipment.

Next, the first embodiment will be described with reference to a specific scenario. Assuming that the duration A is smaller than a preset value A, the value of the preset value B is 2 slots, the first TCI state indicated in the DCI carried by the last PDCCH is TCI [00], the downlink reference signal associated with the TCI [00] is CSI-RS #1, the pre-specified second TCI state is TCI [01], and the downlink reference signal associated with the TCI [01] is CSI-RS # 2. And in slot n, the network equipment sends DCI carried by the PDCCH to the terminal equipment. The network device determines that the slot corresponding to the last sending of the DCI carried by the PDCCH is slot m, wherein m is less than n. Referring to fig. 4a, if the number of slots in the interval between slot n and slot m is less than 2, the network device transmits a radio signal carried by the PDSCH using a transmission beam used when transmitting CSI-RS # 1. Referring to fig. 4b, if the slot number of the interval between slot n and slot m is equal to 2, the network device transmits a radio signal carried by the PDSCH using a transmission beam used when transmitting CSI-RS # 2. Correspondingly, because the duration a is less than the preset value a, the starting time of the PDSCH should be earlier than the time when the terminal device demodulates the DCI carried by the PDCCH, so for the terminal device, when the slot number of the interval between the slot n and the slot m is less than 2, the receiving beam adopted when receiving the CSI-RS #1 may be adopted to monitor the radio signal carried by the PDSCH, and conversely, the receiving beam adopted when receiving the CSI-RS #2 is adopted to monitor the radio signal carried by the PDSCH. The shaded parts shown in fig. 4a and 4b are time domain positions corresponding to PDSCH resources.

In the first embodiment, the network device and the terminal device may flexibly select the preset rule for determining the TCI state according to the duration of the interval between two PDCCH transmissions, i.e. whether the duration B is smaller than the preset value B. When the interval between two PDCCH transmissions is small, the first TCI state indicated by the last PDCCH is adopted, otherwise, the second TCI state which is pre-designated is adopted, so that the mode of selecting the TCI state is more flexible, and the selected TCI state has better timeliness, and further, when the directional beam corresponding to the selected TCI state is adopted to transmit the wireless signal on the PDSCH, the transmission performance of the wireless signal on the PDSCH can be better improved.

Referring to fig. 5, a method for transmitting a wireless signal through a PDSCH is provided in the second embodiment of the present application. The method comprises the following description flow:

step 501: the method comprises the steps that configuration information used when wireless signals are transmitted through a PDSCH is agreed in advance by a network device and a terminal device, and the configuration information comprises a preset value A, at least one preset TCI state and a mode for updating any one TCI state in the at least one TCI state.

The manner in which the network device and the terminal device agree on the preset value a in advance may be as described in the first embodiment. The at least one preconfigured TCI state and the manner of updating any one TCI state of the at least one TCI state may be indicated to the terminal device by the network device through a higher layer instruction, and specifically, the higher layer instruction may be an RRC instruction. Of course, in the implementation, the indication may also be given to the network device and the terminal device by other devices.

Specifically, in at least one preconfigured TCI state, each TCI state represents that the DMRS of the PDSCH and one downlink reference signal satisfy the QCL relationship, that is, each TCI state is associated with one downlink reference signal, and the network device and the terminal device may determine, based on each TCI state, a transmission beam or a reception beam used when transmitting the radio signal carried by the PDSCH. Moreover, the network device and the terminal device may update any one of the at least one TCI state, where updating the TCI state may be understood as updating a downlink reference signal associated with the TCI state. For example, updating TCI [00] can be understood as changing CSI-RS #1 associated with TCI [00] to CSI-RS # 2.

In this embodiment of the application, the manner of updating any one of the at least one TCI state may be configured as an implicit update or an explicit update. Implicit updating is that the terminal device selects a downlink reference signal with a better measurement result to update the TCI state based on the measurement result of the downlink reference signal, and the network device may also select a downlink reference signal with a better measurement result to update the TCI state based on the measurement result of the downlink reference signal reported by the terminal device, and the two methods for updating the TCI state based on the measurement result of the downlink reference signal are the same. The explicit updating is that the network device instructs the terminal device to update the TCI state through a high-level instruction after updating the TCI state. For example, the network device may update TCI [00] through the RRC layer and instruct the terminal device to update TCI [00] through RRC signaling. In the implicit updating manner, the network device and the terminal device may update the TCI state based on the measurement result of the downlink reference signal, and no additional signaling is required to indicate, so that signaling overhead may be reduced. In the explicit updating manner, the network device may instruct the terminal device to synchronously update the TCI states, so that the TCI states of the two updated last times are kept consistent, and reliability is improved.

After the configuration information used when the radio signal is transmitted through the PDSCH is defined, the network device and the terminal device may determine which method to transmit the radio signal through the PDSCH based on the configuration information used when the radio signal is transmitted through the PDSCH, which is defined in advance, if downlink data transmission is required subsequently. The embodiment of the application mainly relates to a process of transmitting a wireless signal through a PDSCH under the condition that the time length A is less than a preset value A. Step 502 to step 503 are processes in which the network device transmits wireless signals through the PDSCH, and step 504 to step 507 are processes in which the terminal device transmits wireless signals through the PDSCH. Specifically, the network device may perform step 502 to step 503 after sending the DCI carried by the PDCCH, and the terminal device may perform step 504 to step 507 after receiving the DCI carried by the PDCCH.

Step 502: the network equipment determines that the duration A is less than a preset value A.

In this case, before receiving the radio signal carried by the PDSCH, the terminal device may not be able to demodulate the DCI carried by the PDCCH in time to obtain the TCI state, so the network device may further determine whether there is an updated TCI state in at least one preconfigured TCI state, and select one TCI state from the updated TCI states.

Step 503: and the network equipment sends the radio signals carried by the PDSCH according to the latest updated TCI state in at least one preconfigured TCI state.

Specifically, the network device may determine, according to the latest updated TCI state, a transmission beam used for transmitting the radio signal carried by the PDSCH as a transmission beam used for transmitting the downlink reference signal associated with the latest updated TCI state, and then the network device may transmit the radio signal carried by the PDSCH according to the determined transmission beam.

For the terminal device, after receiving the DCI carried by the PDCCH, the terminal device needs to consume a certain time to demodulate the DCI carried by the PDCCH, and it is assumed here that a time length required for the terminal device to demodulate the DCI carried by the PDCCH is a preset time length, that is, the preset value a, and then, within the preset time length, in order to monitor whether a radio signal is transmitted on the PDSCH, the terminal device may further select a TCI state from at least one preconfigured TCI state to monitor the PDSCH. See step 504-step 507 for details.

Step 504: and the terminal equipment monitors the radio signal carried by the PDSCH within a preset time according to the latest updated TCI state in at least one preconfigured TCI state.

Specifically, the terminal device may determine, according to the latest updated TCI state, that the reception beam used for receiving the radio signal carried by the PDSCH is the reception beam used for receiving the downlink reference signal associated with the latest updated TCI state, and then the terminal device may monitor the radio signal carried by the PDSCH according to the determined reception beam.

Step 505: and the terminal equipment determines whether the wireless signals carried by the PDSCH are monitored in the preset time length.

If the terminal device has monitored the radio signal carried by the PDSCH within the preset time period, step 506 may be continuously executed. Otherwise, if the terminal device does not monitor the radio signal carried by the PDSCH within the preset time period, step 507 may be continuously performed.

Step 506: and the terminal equipment continues to receive the radio signals carried by the PDSCH according to the latest updated TCI state.

Step 507: and the terminal equipment receives the wireless signal carried by the PDSCH according to the TCI state indicated in the DCI carried by the PDCCH received this time.

In the embodiment of the application, in the process of demodulating DCI carried by PDCCH by the terminal device, that is, within a preset time length, the terminal device may monitor the radio signal carried by PDSCH by determining the latest updated TCI state. After the terminal device demodulates the DCI carried by the PDCCH, if the terminal device does not monitor the radio signal carried by the PDSCH yet, the terminal device may further monitor the radio signal carried by the PDSCH by using the TCI status indicated in the DCI carried by the PDCCH. After the terminal device demodulates the DCI carried by the PDCCH, if the terminal device has monitored the radio signal carried by the PDSCH according to the latest updated TCI state, the terminal device may not switch the TCI state, and continue to use the latest updated TCI state. Therefore, the TCI state adopted when the radio signal carried by the PDSCH is received can be accurately determined, and the TCI state can be synchronized with the TCI state used by the network equipment.

Next, the second embodiment will be described with reference to a specific scenario. Referring to fig. 6, it is assumed that at least one TCI state pre-configured for the terminal device by the network device includes TCI [01], TCI [02], and TCI [03 ]. At slot m1, the network device sends DCI carried by the PDCCH to the terminal device to instruct the terminal device to perform CSI-RS measurement. The DCI comprises TCI [01], CSI-RS #2 to be measured and CSI-RS #3, and it is assumed that a downlink reference signal associated with the current TCI [01] is CSI-RS # 1. And the terminal equipment measures the two CSI-RS resources and mainly measures the CQI and/or the RSRP of the CSI-RS. If the terminal device determines that the measurement result of the CSI-RS #2 is the highest, that is, the CQI and/or RSRP is the highest, the terminal device may update the CSI-RS #1 associated in the TCI [01] maintained by the terminal device to the CSI-RS #2, and send feedback information to the network device. The feedback information at least includes a CSI Resource Indicator (CRI), where the CRI is 2, and is used to indicate that a measurement result of the CSI-RS #2 is the highest. And when slot m2, the network equipment receives the feedback information of the terminal equipment, determines that the measurement result of the CSI-RS #2 is the highest according to the CRI in the feedback information, and updates the CSI-RS #1 which is maintained by the network equipment and is associated in the TCI [01] configured for the terminal equipment in advance into the CSI-RS # 2. Therefore, the network equipment and the terminal equipment can synchronously realize the updating of the pre-configured TCI state based on the implicit updating mode.

Of course, in practical application, an explicit update mode can also be adopted, that is: after determining that the measurement result of the CSI-RS #2 is the highest, the terminal device may first send feedback information to the network device, where the feedback information includes the CRI, and the CRI is 2, and after the network device updates the TCI [01] according to the CRI, the network device may instruct the terminal device to update the TCI [01] through a high-layer signaling. Specifically, the higher layer signaling is, for example, RRC signaling and/or MAC signaling. Therefore, the network equipment and the terminal equipment can synchronously realize the updating of the pre-configured TCI state based on the explicit updating mode.

Further, assume that at slot n1, the network device and the terminal device have completed updating TCI [01], i.e. TCI [01] associated CSI-RS #2 is valid at this time. And when slot n2, the network equipment sends DCI carried by the PDCCH, and after determining that downlink data needs to be sent to the terminal equipment through the PDSCH and the network equipment determines that the time length A is less than the preset value A, the network equipment sends the radio signal carried by the PDSCH by adopting a sending beam adopted for sending the CSI-RS #2 according to the CSI-RS #2 associated with the TCI [01 ]. Correspondingly, after receiving the DCI carried by the PDCCH, the terminal device may also monitor the radio signal carried by the PDSCH by using the receive beam used for receiving the CSI-RS #2 according to the CSI-RS #2 associated with the TCI [01 ]. Here, it is assumed that no update process for any one of the pre-configured TCI states occurs between slot n1 and slot n2, i.e., TCI [01] is the most recently updated TCI state. The size relations of m1, m2, n1 and n2 are m1< m2< n1< n 2.

Subsequently, during the transmission of wireless signals through PDSCH, the network device and the terminal device may use TCI [01] to determine the transmit beam or the receive beam until the next update of the TCI status occurs. The shaded portion shown in fig. 6 is the time domain position corresponding to the PDSCH resource. It should be understood that the next update of the TCI state is not necessarily an update for TCI [01], and may be an update for any TCI state of the at least one pre-configured TCI state. For example, the TCI [02] in the preconfigured TCI [01], TCI [02], and TCI [03] may be updated, that is, the TCI [02] may be determined to be the latest updated TCI state, and further, the transmit beam or the receive beam used when the radio signal carried by the PDSCH is transmitted may be determined continuously according to the TCI [02 ].

In the second embodiment, the network device and the terminal device may transmit the radio signal carried by the PDSCH according to the latest updated TCI status in the at least one TCI status configured in advance. Since the TCI state is generally updated based on the measurement results of the downlink reference signals, the downlink reference signals with better measurement results are selected from the measurement results to update the TCI state, so that the updated TCI state can better adapt to the current channel state. Therefore, by adopting the TCI state updated last time, it is possible to determine that the directional beam used for transmitting the wireless signal on the PDSCH is better, and also to improve the transmission performance of the wireless signal on the PDSCH.

Referring to fig. 7, a method for transmitting a wireless signal through a PDSCH is provided in a third embodiment of the present application. The method comprises the following description flow:

step 701: the network equipment and the terminal equipment agree in advance configuration information used when transmitting wireless signals through the PDSCH, wherein the configuration information comprises a preset value A, a preset rule set and a mode of selecting a preset rule from the preset rule set.

The manner in which the network device and the terminal device agree on the preset value a in advance may be as described in the first embodiment. Regarding the preset rule set and the manner of selecting one preset rule from the preset rule set, the network device may indicate the preset rule set to the terminal device through a higher layer instruction, and specifically, the higher layer instruction may be an RRC instruction. Of course, in the implementation, the indication may also be given to the network device and the terminal device by other devices.

In an embodiment of the present application, the preset rule set includes at least two preset rules, and each preset rule is used to determine the TCI status. Specifically, the preset rule set may include, but is not limited to, the following preset rules:

preset rule 1: and adopting a first TCI state indicated in the DCI carried by the PDCCH last time. For the network device, the first TCI status indicated in the DCI carried by the PDCCH last time is the first TCI status indicated in the DCI carried by the PDCCH last time sent by the network device. For the terminal device, the first TCI status indicated in the DCI carried by the PDCCH last time is the first TCI status indicated in the DCI carried by the PDCCH last time received by the terminal device.

Rule 2 is preset: a pre-specified second TCI state is employed.

Preset rule 3: the latest updated TCI state of the preconfigured at least one TCI state is employed.

In addition, considering that the time interval between the current sending of the DCI carried by the PDCCH and the last sending of the DCI carried by the PDCCH by the network device is long, since the channel may have obvious changes, if the TCI state indicated in the last PDCCH carrying DCI is continuously used, it may be difficult to adapt to the current channel condition, so a condition for determining whether the first TCI state indicated in the last PDCCH carrying DCI may be adopted may also be added in the embodiment of the present application. In this case, the preset rule set may include, but is not limited to, the following preset rules:

preset rule 1: and determining the TCI state according to the time length B, wherein when the time length B is less than a preset value B, a first TCI state indicated in the DCI carried by the PDCCH last time is adopted, and when the time length B is greater than or equal to the preset value B, a second TCI state specified in advance is adopted.

Rule 2 is preset: the latest updated TCI state of the preconfigured at least one TCI state is employed.

For specific description of the preset rule, reference may be made to the description in the first embodiment and the second embodiment, and details are not described here.

In addition, the network device and the terminal device may also agree in advance on the priority of each preset rule in the preset rule set. For example, after the preset rule set is created by the network device, a priority may be set for each preset rule in the preset rule set, and the priority may be indicated to the terminal device through a high-level instruction. Wherein, according to the TCI states determined by the preset rules with different priorities, the transmission quality is different when the wireless signals carried by the PDSCH are transmitted. For example, a TCI state determined according to a preset rule with a higher priority may be defined, and a transmission rate of a wireless signal when a wireless signal carried by the PDSCH is transmitted may be higher, or a TCI state determined according to a preset rule with a lower priority may be defined, and robustness of a wireless signal when a wireless signal carried by the PDSCH is transmitted may be higher, and the like.

In the embodiment of the present application, the manner of selecting one preset rule from the preset rule set may be divided into two cases, that is, selecting one preset rule from the preset rule set for the first time and selecting one preset rule from the preset rule set for the non-first time. The first selection of a preset rule from the preset rules may be understood as a first selection of a preset rule from the preset rule set within a period of time. For example, within slot n to slot m, the network device sends a wireless signal to the terminal device three times through the PDSCH, assuming that the first time is when the duration a is greater than or equal to the preset value a, that is, the network device and the terminal device may determine a transmission beam and a reception beam using the TCI state indicated in the DCI carried by the PDCCH this time, assuming that the second time is when the duration a is less than the preset value a, the network device and the terminal device may understand that a preset rule is selected from a preset rule set for the first time, and further, assuming that the third time is also when the duration a is less than the preset value a, the network device and the terminal device may understand that a preset rule is selected from the preset rule set for the third time.

For the first time, a preset rule may be selected from the preset rule set in a pre-configured manner. Specifically, the terminal device may be indicated in advance by the network device through higher layer signaling, or may also be indicated to the terminal device by the network device through dynamic signaling (such as DCI). The preset rule configured in advance may be a preset rule that specifies to use a certain default, or a preset rule that specifies to use a certain priority. Which preset rule is specifically used can be determined according to actual requirements. For example, if the transmission rate requirement is high, the preset rule with high priority can be configured in advance. For another example, if the requirement on robustness is high, the preset rule with a low priority may be configured in advance.

For a mode of selecting a preset rule from the preset rule set for the non-first time, the preset rule may be selected according to the reception quality information of the terminal device when receiving the radio signal carried by the PDSCH for the previous N times, where N is an integer greater than zero. Since the terminal device may feed back, to the network device, the reception quality information when receiving the radio signal carried by the PDSCH, both the network device and the terminal device may know the reception quality information and select the preset rule based on the reception quality information. Therefore, each time the preset rule is selected, the transmission quality of the wireless signal carried by the PDSCH transmitted last time is considered, so that the TCI state determined by the selected preset rule can better meet the current channel state condition. Certainly, in specific implementation, after the network device selects the preset rule based on the reception quality information, the preset rule selected by the terminal device may be indicated through a high-level signaling, so that the terminal device determines the used preset rule according to the indication of the network device, and reliability is improved.

Further, when the network device and the terminal device select the preset rule based on the reception quality information, it may be decided in advance to select the preset rule according to the priority of each preset rule. The specific implementation will be illustrated hereinafter and will not be described for the moment.

After the network device and the terminal device have agreed the configuration information used when transmitting the wireless signal through the PDSCH, and if downlink data transmission is required subsequently, it may be determined which method to transmit the wireless signal through the PDSCH based on the pre-agreed configuration information used when transmitting the wireless signal through the PDSCH. The embodiment of the application mainly relates to a process of transmitting a wireless signal through a PDSCH under the condition that the time length A is less than a preset value A.

Step 702 to step 704 are processes in which the network device transmits a wireless signal through the PDSCH, and step 705 to step 709 are processes in which the terminal device transmits a wireless signal through the PDSCH. Specifically, the network device may perform step 702 to step 704 after sending the DCI carried by the PDCCH, and the terminal device may perform step 705 to step 709 after receiving the DCI carried by the PDCCH. Wherein, the following steps are the same as those of the first and second embodiments, and reference may be made to the related description of the first and second embodiments, and detailed description thereof is omitted here.

Step 702: the network equipment determines that the duration A is less than a preset value A.

Step 703: the network device selects a preset rule from a preset rule set.

As described in step 701, the network device may select one preset rule from the preset rule set in two cases, that is, select one preset rule from the preset rule set for the first time and select one preset rule from the preset rule set for the non-first time.

If the network device selects a preset rule from the preset rule set for the first time, the network device may select a preset rule configured in advance from the preset rule set. The preset rule configured in advance may be a preset rule that a certain default is designated to be used, or a preset rule that a certain priority is designated to be used.

If the network device selects a preset rule from the preset rule set for the non-first time, the network device may select a preset rule from the preset rule set according to the reception quality information of the terminal device when receiving the radio signal carried by the PDSCH for the previous N times, where N is an integer greater than zero.

The reception quality information includes, but is not limited to, the following: the terminal equipment receives ACK and/or NACK fed back in the process of receiving the wireless signal carried by the PDSCH; RSRP or CQI of reference signals on PDSCH measured by the terminal device.

Specifically, the network device may determine whether the handover condition of the preset rule is satisfied according to the reception quality information fed back by the terminal device when the radio signal carried by the PDSCH is received N times before.

When the receiving quality information of the terminal device receiving the radio signal carried by the PDSCH for the previous N times indicates that the receiving quality is poor, the network device may determine a handover condition that satisfies a preset rule, and may further select one preset rule from second preset rules in the preset rule set, where the second preset rule is a preset rule selected from the preset rule set last time.

For example, the network device may select one preset rule from the second preset rules after detecting that the number of times of receiving ACKs is less than a first preset number of times or the number of times of receiving NACKs is greater than or equal to a second preset number of times.

For another example, the network device may further select one preset rule from the second preset rules after detecting that the average value of the received RSRP is smaller than the first preset average value or the average value of the received CQI is smaller than the second preset average value.

For another example, the network device may further select one preset rule from the second preset rules when detecting that the number of times that the received RSRP is smaller than the first preset threshold is greater than a third preset number of times, or the number of times that the received CQI is smaller than the second preset threshold is greater than a fourth preset number of times.

The first preset number, the second preset number, the first preset average value, the second preset average value, the third preset number and the fourth preset number may be predetermined by the network device and the terminal device.

Further, in selecting the preset rule, the preset rule to be used may be selected based on the priority of the second preset rule. For example, if the lower priority preset rule is assumed, the higher the robustness of the radio signal is when the radio signal carried by the PDSCH is transmitted, then when the reception quality is poor, the lower priority preset rule may be selected from the second preset rules.

When the receiving quality information of the terminal device receiving the radio signal carried by the PDSCH for the previous N times represents that the receiving quality is good, which indicates that the receiving quality when the terminal device receives the radio signal carried by the PDSCH is good when the preset rule selected from the preset rule set last time is adopted, the preset rule selected from the preset rule set last time, that is, the first preset rule, can be continuously used without switching the preset rule. Of course, in actual application, even if the receiving quality is good, it may be determined whether to select another preset rule from the preset rule set according to actual requirements.

Step 704: and the network equipment sends the wireless signal carried by the PDSCH according to the TCI state determined by the selected preset rule.

Each preset rule can determine a TCI state, so that the network device can determine a transmission beam used for transmitting a radio signal carried by the PDSCH based on the TCI state determined by the selected preset rule. Specifically, according to the TCI status, the procedure of transmitting the radio signal carried by the PDSCH can be referred to the related description in the first embodiment and the second embodiment.

For the terminal device, after receiving the DCI carried by the PDCCH, the terminal device needs to consume a certain time to demodulate the DCI carried by the PDCCH, and it is assumed here that a time length required for the terminal device to demodulate the DCI carried by the PDCCH is a preset time length, that is, the preset value a, and then, in order to monitor whether a radio signal is transmitted on the PDSCH or not, the terminal device may further select a preset rule from a preset rule set agreed in advance with the network device, and monitor the PDSCH according to the selected preset rule. See steps 705 to 709 for details.

Step 705: the terminal equipment selects a preset rule from a preset rule set.

Since the manner of selecting a preset rule from the preset rule set by the terminal device and the network device is predetermined, the specific implementation process of this step may refer to the description in step 703. It should be understood that, although there may be opposite execution actions when the network device and the terminal device respectively serve as the sending end and the receiving end, it is understood that the way of selecting the preset rule by the two devices may be referred to each other.

Step 706: and the terminal equipment monitors the radio signals carried by the PDSCH within a preset time according to the TCI state determined by the selected preset rule.

Step 707: and the terminal equipment determines whether the wireless signals carried by the PDSCH are monitored in the preset time length.

If the terminal device has monitored the radio signal carried by the PDSCH within the preset time period, continue to execute step 708. Otherwise, if the terminal device does not monitor the radio signal carried by the PDSCH within the preset time period, continue to execute step 709.

Step 708: and the terminal equipment continues to receive the wireless signals carried by the PDSCH according to the TCI state determined by the selected preset rule.

Step 709: and the terminal equipment receives the wireless signal carried by the PDSCH according to the TCI state indicated in the DCI carried by the PDCCH received this time.

Specifically, each preset rule may determine a TCI state, so that the terminal device may determine a reception beam used when receiving the radio signal carried by the PDSCH based on the TCI state determined by the selected preset rule. Specifically, according to the TCI status, the procedure of receiving the radio signal carried by the PDSCH can be referred to the related description in the first embodiment and the second embodiment.

Next, the third embodiment will be described with specific scenarios. It is assumed that the preset rules included in the preset rule set agreed in advance by the network device and the terminal device and the priority of each preset rule are as shown in table 1 below.

TABLE 1

Wherein, the priority levels 1-3 are in the order from low to high. When the wireless signals carried by the PDSCH are transmitted using the directional beam determined by the preset rule with higher priority, the higher the reception rate is, but the lower the robustness in reception may be. For example, according to the preset rule corresponding to the priority level 1, the directional beam determined by using the TCI state configured in the CORESET is generally a wide beam, so that the directional beam has better robustness, and can be understood as higher transmission stability.

Referring to fig. 8a, it is assumed that at slot m1, the network device instructs the terminal device to adopt a preset rule with priority 2 through high layer signaling. The higher layer signaling is for example RRC reconfiguration signaling. In practical application, the network device may further instruct the terminal device to adopt a preset rule of priority 2 through dynamic signaling (e.g. DCI). It is assumed here that the preset rule of priority 2 indicates a TCI state of TCI [01], and that TCI [01] is associated with CSI-RS # 2.

At slot m2, the network device and the terminal device have completed configuration, and the preset rule of priority 2 is confirmed to be in effect. Wherein m1> m 2. Generally, the configuration procedure of RRC reconfiguration signaling is generally 10 slots, and the configuration procedure of dynamic signaling is generally 1 slot.

After slot m2, if the network device determines that the duration a is less than the preset value a, it may determine to transmit the radio signal carried by the PDSCH by using the transmission beam when transmitting CSI-RS #2 according to TCI [01 ]. Correspondingly, after receiving the DCI carried by the PDCCH, the terminal device may also determine to monitor the radio signal carried by the PDSCH by using the receive beam when receiving the CSI-RS #2 according to the TCI [01 ].

Further, continuing with the above example, referring to fig. 8b, assuming that the preset rule of priority 2 is in effect, that is, TCI [01], starting at slot n1, the network device transmits the radio signal carried by the PDSCH using the transmission beam when transmitting CSI-RS #2, and correspondingly, the terminal device also listens to the radio signal carried by the PDSCH using the reception beam when receiving CSI-RS # 2. Meanwhile, the terminal device may count the number of times of ACK or NACK fed back to the network device each time a radio signal carried by the PDSCH is received, starting from slot n 1. Accordingly, the network device may also count the number of times of ACK or NACK fed back by the terminal device received each time. Wherein, the shaded portion in fig. 8a and 8b is the time domain position corresponding to the PDSCH resource.

In slot n2, if the terminal device detects that the NACK number fed back to the network device is greater than or equal to a second preset number X, where X is assumed to be 3, the terminal device switches the preset rule of priority 2 currently adopted to the preset rule of priority 1. Meanwhile, the network device may also detect that the number of received NACKs is greater than or equal to 3, and further switch the currently adopted preset rule of priority 2 to the preset rule of priority 1. It is assumed here that the preset rule of priority 1 indicates a TCI status of TCI [00], and that TCI [00] is associated with CSI-RS # 1.

It should be noted that there may be a time delay when the network device and the terminal device count the number of NACKs, for example, if slot n, the terminal device sends an xth NACK, but when slot n1, n1> n, the network device may receive the xth NACK, and count that NACK is greater than or equal to X times. In order to solve the aforementioned delay problem, the terminal device may delay several slots after triggering the switching condition of the preset rule according to a timing relationship fed back by a hybrid automatic repeat request (HARQ), and then switch from the preset rule of priority 2 to the preset rule of priority 1. For example, in a Frequency Division Duplex (FDD) system, after the terminal device sends NACK, the network device will respond after 4 slots, and therefore, the terminal device may delay switching of the preset rule by 4 slots. Further, after the network device and the terminal device complete the switching of the preset rule, the counted NACK frequency is cleared. When the counted NACK times are cleared, the terminal equipment can delay several slots to execute clearing so as to ensure the synchronization with the network equipment.

Subsequently, if the network device determines that the duration a is smaller than the preset value a, it may determine to transmit the radio signal carried by the PDSCH by using the transmission beam when transmitting the CSI-RS #1 according to the TCI [00 ]. Correspondingly, the terminal equipment can also adopt the receiving beam when receiving the CSI-RS #1 to monitor the radio signals carried by the PDSCH according to the TCI [00 ].

In the third embodiment, the network device and the terminal device may pre-define the preset rule set, and may flexibly select one preset rule from the preset rule set to determine the TCI state, so that when the radio signal carried by the PDSCH is transmitted according to the determined TCI state, the current channel state may be better adapted, and the transmission performance is better. And, can also according to the receiving situation that the terminal equipment actually receives the radio signal that PDSCH bore, switch over the preset rule used selectively, can accord with the receiving requirement of the terminal equipment better, and then reach better receiving effect.

Hereinafter, a communication apparatus according to an embodiment of the present application will be described with reference to the accompanying drawings based on the same technical concept.

The embodiment of the present application provides a communication apparatus, which has corresponding functions to implement the network device (e.g., base station) related to the first embodiment of the method described above. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

Fig. 9 shows a schematic structural diagram of a communication apparatus 900 according to an embodiment of the present application, where the apparatus 900 includes a processor 901 and a transceiver 902. Wherein the processor 901 is configured to support the network device to execute the functions related to the first embodiment of the method. The transceiver 902 is configured to support messaging functions of network devices. The apparatus 900 may further include a memory 903, where the processor 901, the transceiver 902 and the memory 903 are connected, the memory 903 is configured to store computer program instructions necessary for implementing the functions of the network device in the first embodiment of the method, and the processor 901 is configured to execute the computer program instructions stored in the memory 903 to control the transceiver 902 to transmit and receive signals, so as to complete the steps of the network device in the first embodiment of the method for executing the corresponding functions.

Specifically, the processor 901 is configured to determine that a first time length is smaller than a first preset value, where the first time length is a time length of an interval between DCI carried by the PDCCH sent by the device 900 this time and a radio signal carried by the PDSCH to be sent;

the processor 901 is further configured to determine a second duration, where the second duration is a duration of an interval between a DCI carried by the PDCCH being sent this time and a DCI carried by the PDCCH being sent last time by the apparatus 900;

the processor 901 is further configured to control the transceiver 902 to transmit a radio signal carried by the PDSCH according to a first TCI state indicated in the DCI carried by the last PDCCH transmission when the second duration is smaller than a second preset value; and when the second duration is greater than or equal to the second preset value, controlling the transceiver 902 to transmit the radio signal carried by the PDSCH according to a second pre-specified TCI state.

The specific steps executed by the processor 901 and the transceiver 902 can be referred to in the related description of the steps involved in the network device of the above method embodiment, and are not described in detail here.

The apparatus 900 may also be implemented by a logic unit, and fig. 10 illustrates a schematic structural diagram of a communication apparatus 1000 according to an embodiment of the present application, where the apparatus 1000 includes a processing unit 1001 and a transceiver unit 1002. The processing unit 1001 corresponds to the processor 901 described in the apparatus 900, and the transceiver unit 1002 corresponds to the transceiver 902 described in the apparatus 900, which may be respectively configured to implement corresponding functions of the network device related to the first method embodiment.

The embodiment of the application provides a communication device, and the device has corresponding functions of terminal equipment for realizing the method in the embodiment. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

Fig. 11 shows a schematic structural diagram of a communication apparatus 1100 according to an embodiment of the present application, where the apparatus 1100 includes a processor 1101 and a transceiver 1102. Wherein the processor 1101 is configured to enable the terminal device to execute the functions related to the first embodiment of the method. The transceiver 1102 is configured to support messaging functions for the terminal devices. The apparatus 1100 may also include a memory 1103. The processor 1101, the transceiver 1102 and the memory 1103 are connected, the memory 1103 is configured to store computer program instructions necessary for implementing the functions of the terminal device in the first embodiment of the method, and the processor 1101 is configured to execute the computer program instructions stored in the memory 1103 to control the transceiver 1102 to transmit and receive signals, so as to complete the steps of the terminal device in the first embodiment of the method for executing the corresponding functions.

Specifically, the processor 1101 is configured to determine a first time length, where the first time length is a time length of an interval between the receiving of the DCI carried by the PDCCH this time and the receiving of the DCI carried by the PDCCH last time by the apparatus 1100;

the processor 1101 is further configured to control the transceiver 1102 to monitor a radio signal carried by the PDSCH within a preset time according to a first TCI state indicated in the DCI carried by the PDCCH received last time when the first time is smaller than a first preset value; when the first duration is greater than or equal to the first preset value, controlling the transceiver 1102 to monitor a radio signal carried by the PDSCH within the preset duration according to a second pre-specified TCI state; the preset duration is a duration required by the apparatus 1100 to demodulate DCI carried by the PDCCH, and the preset duration, the first preset value, and a preset rule for determining the TCI state are predetermined by the apparatus 1100 and a network device; the preset rule for determining the TCI status includes adopting a first TCI status indicated in DCI carried by a PDCCH last time and adopting a second TCI status specified in advance.

The specific steps executed by the processor 1101 and the transceiver 1102 can be referred to in the related description of the steps involved in the terminal device of the above method embodiment, and are not described in detail here.

The apparatus 1100 may also be implemented by a logic unit, and fig. 12 illustrates a schematic structural diagram of a communication apparatus 1200 according to an embodiment of the present application, where the apparatus 1200 includes a processing unit 1201 and a transceiver unit 1202. The processing unit 1201 corresponds to the processor 1101 described in the apparatus 1100, and the transceiver unit 1202 corresponds to the transceiver 1102 described in the apparatus 1100, and may be respectively configured to implement corresponding functions of the terminal device related to the first method embodiment, and specific implementation processes may refer to the first method embodiment and related descriptions in the apparatus 1100, which are not described herein again.

The embodiment of the present application provides a communication apparatus, which has corresponding functions for implementing the network device (e.g., base station) related to the second embodiment of the method. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

Fig. 13 shows a schematic structural diagram of a communication apparatus 1300 according to an embodiment of the present application, where the apparatus 1300 includes a processor 1301 and a transceiver 1302. Wherein, the processor 1301 is configured to support a network device to execute the functions related to the second method embodiment. The transceiver 1302 is configured to support messaging functions for network devices. The apparatus 1300 may further include a memory 1303, where the processor 1301, the transceiver 1302 and the memory 1303 are connected, the memory 1303 is configured to store necessary computer program instructions for implementing the functions of the network device in the second embodiment of the method, and the processor 1301 is configured to execute the computer program instructions stored in the memory 1303, so as to control the transceiver 1302 to transmit and receive signals, thereby completing the step in which the network device in the second embodiment of the method executes the corresponding functions.

Specifically, the processor 1301 is configured to determine that a first time length is shorter than a first preset value, where the first time length is a time length of an interval between DCI carried by a PDCCH sent by the apparatus 1300 this time and a radio signal carried by a PDSCH to be sent;

the processor 1301 is further configured to control the transceiver 1302 to transmit a radio signal carried by the PDSCH according to a latest updated TCI status in the preconfigured at least one transmission configuration indication TCI status.

The specific steps executed by the processor 1301 and the transceiver 1302 may refer to the related descriptions in the steps related to the network device in the second method embodiment, and are not described in detail here.

The apparatus 1300 may also be implemented by a logic unit, and fig. 14 shows a schematic structural diagram of a communication apparatus 1400 provided in an embodiment of the present application, where the apparatus 1400 includes a processing unit 1401 and a transceiver unit 1402. A processing unit 1401 corresponds to the processor 1301 described in the apparatus 1300, and a transceiver unit 1402 corresponds to the transceiver 1302 described in the apparatus 1300, and may be respectively configured to implement corresponding functions of the network device related to the second method embodiment, and specific implementation processes may refer to the second method embodiment and related descriptions in the apparatus 1300, and are not described herein again.

The embodiment of the application provides a communication device, and the device has corresponding functions of terminal equipment for realizing the second embodiment of the method. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

Fig. 15 shows a schematic structural diagram of a communication apparatus 1500 provided in an embodiment of the present application, where the apparatus 1500 includes a processor 1501 and a transceiver 1502. Wherein the processor 1501 is configured to enable the terminal device to perform the functions mentioned in the second method embodiment. The transceiver 1502 is configured to support messaging functions for end-point devices. The apparatus 1500 may also include a memory 1503. The processor 1501, the transceiver 1502 and the memory 1503 are connected, the memory 1503 is configured to store computer program instructions necessary for implementing the functions of the terminal device in the second method embodiment, and the processor 1501 is configured to execute the computer program instructions stored in the memory 1503 to control the transceiver 1502 to transmit and receive signals, so as to complete the steps of the terminal device in the second method embodiment to execute the corresponding functions.

Specifically, the processor 1501 is configured to control the transceiver 1502 to monitor a radio signal carried by the PDSCH within a preset time according to a latest updated TCI state of at least one preconfigured TCI state; wherein the preset duration is a duration required by the apparatus 1500 to demodulate DCI carried by the PDCCH; the preset duration, the at least one TCI status, and the manner in which the apparatus updates any one of the at least one TCI status are predefined by the apparatus 1500 and the network device.

The specific steps executed by the processor 1501 and the transceiver 1502 can be referred to in the related description of the steps related to the second terminal device in the above method embodiments, and will not be described in detail here.

The apparatus 1500 may also be implemented by a logic unit, and fig. 16 shows a schematic structural diagram of a communication apparatus 1600 provided in an embodiment of the present application, where the apparatus 1600 includes a processing unit 1601 and a transceiver unit 1602. The processing unit 1601 corresponds to the processor 1501 described in the apparatus 1500, and the transceiver unit 1602 corresponds to the transceiver 1502 described in the apparatus 1500, which may be respectively configured to implement corresponding functions of the terminal device related to the second method embodiment, and specific implementation processes may refer to the second method embodiment and related descriptions in the apparatus 1500, and are not described herein again.

The embodiment of the present application provides a communication apparatus, where the apparatus has a corresponding function of implementing a network device (e.g., a base station) related to the third embodiment of the method. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

Fig. 17 is a schematic structural diagram illustrating a communication apparatus 1700 according to an embodiment of the present application, where the apparatus 1700 includes a processor 1701 and a transceiver 1702. Wherein the processor 1701 is configured to support a network device to perform the functions involved in the third method embodiment described above. The transceiver 1702 is configured to support messaging functions for network devices. The apparatus 1700 may further include a memory 1703, wherein the processor 1701, the transceiver 1702 and the memory 1703 are connected, the memory 1703 is configured to store computer program instructions necessary for implementing the functions of the network device according to the third embodiment of the method, and the processor 1701 is configured to execute the computer program instructions stored in the memory 1703 to control the transceiver 1702 to transmit and receive signals, so as to complete the steps of the network device according to the third embodiment of the method to perform the corresponding functions.

Specifically, the processor 1701 is configured to determine that a first time length is smaller than a first preset value, where the first time length is a time length of an interval between DCI carried by a PDCCH sent by the device 1700 this time and a radio signal carried by a PDSCH to be sent;

the processor 1701 is further configured to select a preset rule from a preset rule set; the preset rule set comprises at least two preset rules, and each preset rule is used for determining the state of the Transmission Configuration Indication (TCI);

the processor 1701 is further configured to control the transceiver 1702 to transmit a radio signal carried by the PDSCH according to the TCI status determined by the selected preset rule.

The specific steps executed by the processor 1701 and the transceiver 1702 may be referred to in the related description of the steps involved in the three network devices of the above method embodiments, and will not be described in detail here.

The apparatus 1700 may also be implemented by a logic unit, and fig. 18 shows a schematic structural diagram of a communication apparatus 1800 according to an embodiment of the present application, where the apparatus 1800 includes a processing unit 1801 and a transceiver unit 1802. The processing unit 1801 corresponds to the processor 1701 in the apparatus 1700, and the transceiver unit 1802 corresponds to the transceiver 1702 in the apparatus 1700, and may be respectively configured to implement corresponding functions of the network device related to the third method embodiment, and for a specific implementation process, reference may be made to the third method embodiment and related descriptions in the apparatus 1700, and details are not described here.

The embodiment of the application provides a communication device, and the device has corresponding functions of terminal equipment for realizing the third embodiment of the method. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

Fig. 19 is a schematic structural diagram of a communication device 1900 according to an embodiment of the present disclosure, where the device 1900 includes a processor 1901 and a transceiver 1902. Wherein the processor 1901 is configured to support the terminal device to execute the functions related to the third method embodiment. The transceiver 1902 is configured to support messaging functionality for end-point devices. The apparatus 1900 may also include a memory 1903. The processor 1901, the transceiver 1902 and the memory 1903 are connected, where the memory 1903 is used for storing necessary computer program instructions for implementing the functions of the terminal device in the third embodiment of the method, and the processor 1901 is used for executing the computer program instructions stored in the memory 1903 to control the transceiver 1902 to transmit and receive signals, so as to complete the steps of the terminal device in the third embodiment of the method for executing the corresponding functions.

Specifically, the processor 1901 is configured to select a preset rule from a preset rule set; the preset rule set comprises at least two preset rules, and each preset rule is used for determining the TCI state;

the processor 1901 is further configured to control the transceiver 1902 to monitor a radio signal carried by the PDSCH within a preset time according to the TCI state determined by the selected preset rule;

wherein the preset duration is a duration required by the apparatus 1900 to demodulate DCI carried by the PDCCH; the preset duration, the preset rule set, and the manner of selecting one preset rule from the preset rule set are predetermined by the apparatus 1900 and the network device.

The apparatus 1900 may also be implemented by a logic unit, and fig. 20 shows a schematic structural diagram of a communication apparatus 2000 according to an embodiment of the present application, where the apparatus 2000 includes a processing unit 2001 and a transceiver unit 2002. The processing unit 2001 corresponds to the processor 1901 in the apparatus 1900, and the transceiver unit 2002 corresponds to the transceiver 1902 in the apparatus 1900, which can be respectively used to implement corresponding functions of the terminal device related to the third method embodiment, and specific implementation processes may refer to the third method embodiment and related descriptions in the apparatus 1900, and are not described herein again.

The embodiment of the present application provides a communication system, including a network device related to the first method embodiment and at least one terminal device related to the first method embodiment; or, the network device and the terminal device include the network device and at least one terminal device; or, the network device and the terminal device according to the third embodiment of the method are included.

The present application further provides a chip, which may be connected to a memory, and is configured to read and execute a program code stored in the memory, so as to implement the method related to the network device or the terminal device in the first method embodiment, or the method related to the network device or the terminal device in the second method embodiment, or the method related to the network device or the terminal device in the third method embodiment.

The present application further provides a computer storage medium for storing a program or an instruction, where the program or the instruction, when running on a computer, may implement the method according to the first method embodiment, the method according to the second method embodiment, or the method according to the third method embodiment, or the method according to the terminal device.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A communications apparatus, comprising: a processor and a transceiver;

the processor is configured to determine that a first time length is smaller than a first preset value, where the first time length is a time length of an interval between a downlink control information DCI carried by a downlink physical control channel PDCCH which is sent by the apparatus this time and a radio signal carried by a downlink physical shared channel PDSCH to be sent;

the processor is further configured to determine a second duration, where the second duration is a duration of an interval between the DCI carried by the PDCCH sent this time and the DCI carried by the PDCCH sent last time by the apparatus;

the processor is further configured to control the transceiver to transmit a radio signal carried by the PDSCH according to a first Transmission Configuration Indication (TCI) state indicated in the DCI carried by the last-transmitted PDCCH when the second duration is smaller than a second preset value; and when the second duration is greater than or equal to the second preset value, controlling the transceiver to transmit the radio signal carried by the PDSCH according to a second pre-specified TCI state.

2. A communications apparatus, comprising: a processor and a transceiver;

the processor is configured to determine a first time length, where the first time length is a time length of an interval between receiving, by the apparatus, downlink control information DCI carried by a downlink physical control channel PDCCH this time and receiving, by the apparatus, DCI carried by a PDCCH last time;

the processor is further configured to control the transceiver to monitor a radio signal carried by the PDSCH within a preset duration according to a first Transmission Configuration Indication (TCI) state indicated in the DCI carried by the last received PDCCH when the first duration is smaller than a first preset value; when the first time length is greater than or equal to the first preset value, controlling the transceiver to monitor a radio signal carried by the PDSCH within the preset time length according to a second pre-designated TCI state;

the preset time length is the time length required by the device for demodulating DCI carried by the PDCCH, and the preset time length, the first preset value and a preset rule for determining the TCI state are predetermined by the device and network equipment; the preset rule for determining the TCI status includes adopting a first TCI status indicated in DCI carried by a PDCCH last time and adopting a second TCI status specified in advance.

3. The apparatus of claim 2, wherein the processor is further configured to:

determining whether the transceiver monitors a radio signal carried by a PDSCH within the preset time length;

if the transceiver monitors the radio signal carried by the PDSCH within the preset time, the processor continues to control the transceiver to receive the radio signal carried by the PDSCH according to the first TCI state or the second TCI state;

and if the transceiver does not monitor the radio signal carried by the PDSCH within the preset time, the processor controls the transceiver to receive the radio signal carried by the PDSCH according to the TCI state indicated in the DCI carried by the PDCCH received this time.

4. A communications apparatus, comprising: a processor and a transceiver;

the processor is further configured to control the transceiver to transmit a radio signal carried by the PDSCH according to a latest updated TCI status in the preconfigured at least one transmission configuration indication TCI status.

5. The apparatus of claim 4, wherein the processor, prior to determining that the first duration is less than the first preset value, is further configured to:

and updating the TCI state to be updated in at least one preconfigured TCI state, and controlling the transceiver to instruct the terminal equipment to update the TCI state to be updated.

6. A communications apparatus, comprising: a processor and a transceiver;

the processor is configured to control the transceiver to monitor a radio signal carried by a PDSCH (physical downlink shared channel) within a preset time according to a latest updated TCI state in at least one transmission configuration indication TCI state configured in advance;

the preset time length is the time length required by the device for demodulating Downlink Control Information (DCI) carried by a downlink physical control channel (PDCCH); the preset duration, the at least one TCI status, and the manner in which the apparatus updates any one of the at least one TCI status are predetermined by the apparatus and the network device.

7. The apparatus of claim 6, wherein the processor is further configured to:

if the transceiver monitors the radio signals carried by the PDSCH within the preset time length, the processor continues to control the transceiver to receive the radio signals carried by the PDSCH according to the latest updated TCI state;

8. A communications apparatus, comprising: a processor and a transceiver;

the processor is further configured to select a preset rule from a preset rule set according to reception quality information fed back by the terminal device when receiving the radio signal carried by the PDSCH for the previous N times, where N is an integer greater than zero; the preset rule set comprises at least two preset rules, and each preset rule is used for determining the state of the Transmission Configuration Indication (TCI);

the processor is further configured to control the transceiver to transmit a radio signal carried by the PDSCH according to the TCI status determined by the selected preset rule.

9. The apparatus of claim 8, wherein the preset rule set comprises at least two preset rules:

adopting a first TCI state indicated in DCI carried by the PDCCH sent last time;

adopting a second pre-specified TCI state;

10. The apparatus of any of claims 8 to 9, wherein the processor, prior to selecting one of the predetermined rules from the set of predetermined rules, is further configured to:

creating a preset rule set comprising the at least two preset rules;

and controlling the transceiver to send an indication message to the terminal equipment, wherein the indication message comprises the preset rule set containing at least two preset rules and a mode of selecting one preset rule from the preset rule set.

11. The apparatus according to any of claims 8 to 9, wherein the processor, when selecting one of the preset rules from the preset rule set, is specifically configured to:

and selecting a preset rule configured in advance from a preset rule set.

12. The apparatus of claim 8, wherein the reception quality information comprises at least one of:

the terminal equipment receives acknowledgement characters ACK and/or non-acknowledgement characters NACK fed back in the process of receiving the wireless signals carried by the PDSCH;

the terminal device measures a reference signal received power, RSRP, or a channel quality indication, CQI, of a reference signal on the PDSCH.

13. The apparatus of claim 12, wherein the processor, when selecting one preset rule from a preset rule set according to the reception quality information fed back by the terminal device when receiving the radio signal carried by the PDSCH for the previous N times, is specifically configured to:

determining a switching condition meeting a preset rule according to the receiving quality information fed back by the terminal equipment when the wireless signal borne by the PDSCH is received for the previous N times;

selecting a preset rule from second preset rules in the preset rule set except for a first preset rule, wherein the first preset rule is the preset rule selected from the preset rule set last time;

wherein, the switching condition of the preset rule is any one of the following conditions:

the number of times of the ACK is less than a first preset number of times;

the number of times of the NACK is greater than or equal to a second preset number of times;

the average value of the RSRP is smaller than a first preset average value;

the average value of the CQI is smaller than a second preset average value;

the number of times that the RSRP is smaller than the first preset threshold is larger than a third preset number of times;

and the times that the CQI is smaller than the second preset threshold value are larger than the fourth preset times.

14. A communications apparatus, comprising: a processor and a transceiver;

the processor is configured to select a preset rule from a preset rule set according to the reception quality information when receiving the radio signal carried by the PDSCH for the previous N times, where N is an integer greater than zero; the preset rule set comprises at least two preset rules, and each preset rule is used for determining the state of the Transmission Configuration Indication (TCI);

the processor is further configured to control the transceiver to monitor a radio signal carried by a downlink physical shared channel PDSCH within a preset time according to the TCI state determined by the selected preset rule;

the preset time length is the time length required by the device for demodulating Downlink Control Information (DCI) carried by a downlink physical control channel (PDCCH); the preset duration, the preset rule set and a mode of selecting one preset rule from the preset rule set are predetermined by the device and the network equipment.

15. The apparatus of claim 14, wherein the preset rule set comprises at least two preset rules:

adopting a first TCI state indicated in DCI carried by the PDCCH received last time;

adopting a second pre-specified TCI state;

16. The apparatus according to any of claims 14 to 15, wherein the processor, when selecting one of the predetermined rules from the predetermined rule set, is configured to:

and selecting a preset rule configured in advance from a preset rule set, wherein the preset rule configured in advance is agreed by the device and the network equipment.

17. The apparatus of claim 14, wherein the reception quality information comprises at least one of:

the device feeds back a correct response instruction ACK and/or an error response instruction NACK in the process of receiving the wireless signal carried by the PDSCH;

the device measures a reference signal received power, RSRP, or a channel quality indication, CQI, of a reference signal on the PDSCH.

18. The apparatus as claimed in claim 17, wherein the processor, when selecting one preset rule from a preset rule set according to the reception quality information when receiving the radio signal carried by the PDSCH for the previous N times, is specifically configured to:

determining a switching condition meeting a preset rule according to the receiving quality information when the wireless signals borne by the PDSCH are received for the previous N times;

the number of times of the ACK is less than a first preset number of times;

the average value of the RSRP is smaller than a first preset average value;

the average value of the CQI is smaller than a second preset average value;