CN115175321A

CN115175321A - Method and device for determining Physical Downlink Shared Channel (PDSCH) transmission wave beam

Info

Publication number: CN115175321A
Application number: CN202110358425.XA
Authority: CN
Inventors: 刘天心; 王俊伟; 李晓皎; 王磊
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2021-04-01
Filing date: 2021-04-01
Publication date: 2022-10-11

Abstract

The application discloses a method and a device for determining a Physical Downlink Shared Channel (PDSCH) transmission beam, and relates to the technical field of wireless communication. The specific implementation scheme is as follows: receiving Downlink Control Information (DCI), wherein the DCI is used for scheduling a plurality of PDSCHs; determining a time domain spacing between the PDSCH and the DCI in the plurality of PDSCHs; and determining a transmission beam used by the PDSCH according to the time domain interval. Therefore, the transmission beam used by the PDSCH is determined according to the relation between the DCI and the plurality of PDSCHs scheduled by the DCI, the loss of the DMRS joint channel estimation gain and the gain of receiving the PDSCH on the DCI beam can be avoided, and the signal transmission efficiency is improved.

Description

Method and device for determining Physical Downlink Shared Channel (PDSCH) transmission wave beam

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for determining a transmission beam of a physical downlink shared channel PDSCH.

Background

For a situation where a single Downlink Control Information (DCI) schedules a Physical Downlink Shared Channel (PDSCH) of multiple Transport Blocks (TBs) in high-frequency transmission, a method for determining a transmission beam used by a PDSCH when one DCI schedules multiple PDSCHs is not currently available for each PDSCH in the multiple PDSCHs scheduled by the same DCI.

Disclosure of Invention

The disclosure provides a method, a device, equipment and a storage medium for determining a Physical Downlink Shared Channel (PDSCH) transmission beam.

And determining a transmission beam used by the PDSCH according to the relation between the DCI and the plurality of PDSCHs scheduled by the DCI, so that the loss of DMRS joint channel estimation gain and the gain of receiving the PDSCH on the beam of the DCI can be avoided, and the signal transmission efficiency is improved.

According to a first aspect of the present disclosure, a method for determining a physical downlink shared channel PDSCH transmission beam is provided, which is applied to a base station, and is characterized in that the method includes: receiving Downlink Control Information (DCI), wherein the DCI is used for scheduling a plurality of PDSCHs; determining a time domain spacing between the PDSCH and the DCI in the plurality of PDSCHs; and determining the transmission beam used by the PDSCH according to the time domain interval.

In the technical scheme, the transmission beam used by the PDSCH is determined according to the relation between the DCI and the plurality of PDSCHs scheduled by the DCI, so that the loss of DMRS joint channel estimation gain and the gain of receiving the PDSCH on the beam of the DCI can be avoided.

Optionally, the time domain interval is an orthogonal frequency division multiplexing, OFDM, symbol number of the DCI and the PDSCH spaced in the time domain.

Optionally, the determining, according to the time domain interval, a transmission beam used by the PDSCH includes: and if the time domain interval is less than the quasi-co-location duration TimeDurationForQCL and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, taking the transmission beam of the control resource set CORESET which is closest to the PDSCH and has the smallest ID as the transmission beam used by the PDSCH.

And if the time domain interval is less than the quasi-co-location duration TimeDurationForQCL and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, using the transmission beam of the first PDSCH in the time domain scheduled by the DCI as the transmission beam used by the PDSCH.

And if the time domain interval is smaller than the TimeDurationForQCL, the PDSCH is the first PDSCH in the time domain scheduled by the DCI, a conversion interval symbol exists before PDSCH data, and the sum of the time domain interval and the conversion interval symbol is larger than or equal to the TimeDurationForQCL, taking the transmission beam of the DCI as the transmission beam of the PDSCH.

Optionally, the determining, according to the time domain interval, a transmission beam used by the PDSCH includes: and if the time domain interval is greater than or equal to the TimeDurationForQCL and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, taking the transmission beam of the DCI as the transmission beam of the PDSCH.

And if the time domain interval is greater than or equal to the TimeDurationForQCL and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, determining a transmission beam used by the PDSCH according to the difference information between the PDSCH and the previous PDSCH in the PDSCH scheduled by the DCI, wherein the previous PDSCH has the smallest time domain interval with the PDSCH.

Optionally, the determining, according to difference information between the PDSCH and a previous PDSCH that is the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI, a transmission beam used by the PDSCH includes: determining whether a transmission beam of the DCI is the same as a transmission beam used by a previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI; determining whether a time domain interval between the PDSCH and a previous PDSCH in the PDSCH scheduled by the DCI, which is the PDSCH with the smallest time domain interval with the PDSCH, is greater than or equal to n OFDM symbols or n milliseconds, wherein the n is an OFDM symbol number or a millisecond threshold; determining whether the carrier of the PDSCH is the same as the carrier of the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI; acquiring a transmission beam of the PDSCH.

Optionally, the acquiring the transmission beam of the PDSCH includes: if the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time interval with the PDSCH in the PDSCH scheduled by the DCI, the time interval between the PDSCH and the previous PDSCH with the smallest time interval with the PDSCH in the PDSCH scheduled by the DCI is smaller than n OFDM symbols or n milliseconds, and the carrier of the PDSCH is the same as the carrier of the previous PDSCH with the smallest time interval with the PDSCH in the PDSCH scheduled by the DCI, taking the transmission beam of the first PDSCH in the PDSCH scheduled by the DCI as the transmission beam of the PDSCH, wherein n is a positive integer; otherwise, the transmission beam indicated by the DCI is taken as the transmission beam of the PDSCH.

Optionally, after the receiving the downlink control information DCI, the method further includes: determining whether a PDCCH overlaps the PDSCH in a time domain; and if the PDCCH and the PDSCH are overlapped on the time domain, taking a transmission beam of the PDCCH as a transmission beam of the PDSCH.

Optionally, the determining, according to the time domain interval, a transmission beam used by the PDSCH includes: determining whether a plurality of Transmission Configuration Indication (TCIs) are indicated in the DCI, the plurality of TCIs corresponding to one or more of the DCI scheduled PDSCHs; and if a plurality of TCIs are indicated in the DCI, the time domain interval is greater than or equal to the TimeDurationForQCL, and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, taking a transmission beam of the TCI corresponding to the PDSCH in the DCI as a transmission beam of the PDSCH.

And if the DCI indicates a plurality of TCIs, the time domain interval is greater than or equal to the TimeDurationForQCL, and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, determining a transmission beam used by the PDSCH according to difference information between the PDSCH and the previous PDSCH in the PDSCH scheduled by the DCI, wherein the previous PDSCH has the smallest time domain interval with the PDSCH.

Optionally, the determining, according to difference information between the PDSCH and a previous PDSCH that is the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI, a transmission beam used by the PDSCH includes: determining whether the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI; determining whether a time domain interval between the PDSCH and a previous PDSCH in the PDSCH scheduled by the DCI, which is the PDSCH with the smallest time domain interval with the PDSCH, is greater than or equal to n OFDM symbols or n milliseconds, wherein the n is an OFDM symbol number or a millisecond threshold; determining whether the carrier of the PDSCH is the same as the carrier of the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI; acquiring a transmission beam of the PDSCH.

Optionally, the acquiring the transmission beam of the PDSCH includes: if the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time interval with the PDSCH in the PDSCH scheduled by the DCI, the time interval between the PDSCH and the previous PDSCH with the smallest time interval with the PDSCH in the PDSCH scheduled by the DCI is smaller than n OFDM symbols or n milliseconds, and the carrier of the PDSCH is the same as the carrier of the previous PDSCH with the smallest time interval with the PDSCH in the PDSCH scheduled by the DCI, taking the transmission beam of the first PDSCH in the PDSCH scheduled by the DCI as the transmission beam of the PDSCH; otherwise, the transmission beam corresponding to the TCI of the PDSCH in the DCI is used as the transmission beam of the PDSCH.

Optionally, the determining, according to the time domain interval, a transmission beam used by the PDSCH includes: determining whether a TCI field is present in the DCI; if the TCI domain does not exist in the DCI, the time domain interval is greater than or equal to the TimeDurationForQCL, and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, using a beam of the TCI with the minimum activated ID available for the PDSCH in the activated subset bandwidth BWP in a scheduling cell as a transmission beam of the PDSCH; and if the DCI does not have a TCI domain, the time domain interval is greater than or equal to the TimeDurationForQCL, and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, determining a transmission beam used by the PDSCH according to the difference information between the PDSCH and the previous PDSCH in the PDSCH scheduled by the DCI, wherein the previous PDSCH has the smallest time domain interval with the PDSCH.

Optionally, the determining, according to difference information between the PDSCH and a previous PDSCH that is the PDSCH with the smallest time domain interval from the PDSCH in the PDSCH scheduled by the DCI, a transmission beam used by the PDSCH includes: determining whether the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI; determining whether a time domain interval between the PDSCH and a previous PDSCH with a smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI is larger than or equal to n OFDM symbols or n milliseconds, wherein n is the number of the OFDM symbols or a millisecond threshold value; determining whether the carrier of the PDSCH is the same as the carrier of the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI; acquiring a transmission beam of the PDSCH.

Optionally, the acquiring the transmission beam of the PDSCH includes: if the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI, the time interval between the PDSCH and the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI is smaller than n OFDM symbols or n milliseconds, and the carrier wave of the PDSCH is the same as the carrier wave of the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI, taking the transmission beam of the first PDSCH in the PDSCH scheduled by the DCI as the transmission beam of the PDSCH; otherwise, taking the beam of the activated TCI with the smallest ID available for the PDSCH in the activated subset bandwidth BWP in the scheduling cell as the transmission beam of the PDSCH.

According to a second aspect of the present disclosure, there is provided an apparatus for determining a physical downlink shared channel PDSCH transmission beam, which is applied to a base station, and is characterized in that the apparatus includes a memory, a transceiver, and a processor:

a memory for storing a computer program; a transceiver for transceiving data under the control of the processor; a processor for reading the computer program in the memory and performing the following operations: receiving Downlink Control Information (DCI), wherein the DCI is used for scheduling a plurality of PDSCHs; determining a time domain spacing between the PDSCH and the DCI in the plurality of PDSCHs; and determining the transmission beam used by the PDSCH according to the time domain interval.

Optionally, the determining, according to the time domain interval, a transmission beam used by the PDSCH includes: and if the time domain interval is less than the quasi co-location duration TimeDurationForQCL and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, taking the transmission beam of a control resource set CORESET which is closest to the PDSCH and has the smallest ID as the transmission beam used by the PDSCH.

And if the time domain interval is smaller than a quasi co-location duration TimeDurationForQCL and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, using a transmission beam of the first PDSCH in the time domain scheduled by the DCI as a transmission beam used by the PDSCH.

Optionally, the determining, according to the time domain interval, a transmission beam used by the PDSCH includes: and if the time domain interval is greater than or equal to the TimeDurationForQCL and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, using the transmission beam of the DCI as the transmission beam of the PDSCH.

Optionally, the acquiring the transmission beam of the PDSCH includes: if the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI, the time interval between the PDSCH and the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI is smaller than n OFDM symbols or n milliseconds, and the carrier wave of the PDSCH is the same as the carrier wave of the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI, taking the transmission beam of the first PDSCH in the PDSCH scheduled by the DCI as the transmission beam of the PDSCH, wherein n is a positive integer; otherwise, the transmission beam indicated by the DCI is taken as the transmission beam of the PDSCH.

Optionally, the determining, according to the time domain interval, a transmission beam used by the PDSCH includes: determining whether a plurality of Transmission Configuration Indication (TCIs) are indicated in the DCI, the plurality of TCIs corresponding to one or more of the DCI-scheduled PDSCHs; if a plurality of TCIs are indicated in the DCI, the time domain interval is greater than or equal to the TimeDurationForQCL, and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, the transmission beam of the TCI corresponding to the PDSCH in the DCI is used as the transmission beam of the PDSCH.

If a plurality of TCIs are indicated in the DCI, the time domain interval is greater than or equal to the TimeDurationForQCL, and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, determining a transmission beam used by the PDSCH according to difference information between the PDSCH and a previous PDSCH in the PDSCH scheduled by the DCI, wherein the previous PDSCH has the smallest time domain interval with the PDSCH.

Optionally, the determining, according to difference information between the PDSCH and a previous PDSCH that is the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI, a transmission beam used by the PDSCH includes: determining whether the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI; determining whether a time domain interval between the PDSCH and a previous PDSCH with a smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI is larger than or equal to n OFDM symbols or n milliseconds, wherein n is the number of the OFDM symbols or a millisecond threshold value; determining whether the carrier of the PDSCH is the same as the carrier of the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI; acquiring a transmission beam of the PDSCH.

Optionally, the acquiring the transmission beam of the PDSCH includes: if the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI, the time interval between the PDSCH and the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI is smaller than n OFDM symbols or n milliseconds, and the carrier wave of the PDSCH is the same as the carrier wave of the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI, taking the transmission beam of the first PDSCH in the PDSCH scheduled by the DCI as the transmission beam of the PDSCH; otherwise, the transmission beam corresponding to the TCI of the PDSCH in the DCI is used as the transmission beam of the PDSCH.

Optionally, the determining, according to the time domain interval, a transmission beam used by the PDSCH includes: determining whether a TCI field is present in the DCI; if the TCI domain does not exist in the DCI, the time domain interval is greater than or equal to the TimeDurationForQCL, and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, using a beam of the TCI with the minimum activated ID available for the PDSCH in the activated subset bandwidth BWP in a scheduling cell as a transmission beam of the PDSCH; if the TCI domain does not exist in the DCI, the time domain interval is greater than or equal to the TimeDurationForQCL, and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, determining a transmission beam used by the PDSCH according to the difference information between the PDSCH and the previous PDSCH with the smallest time domain interval between the PDSCH and the PDSCH scheduled by the DCI.

Optionally, the acquiring the transmission beam of the PDSCH includes: if the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI, the time interval between the PDSCH and the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI is smaller than n OFDM symbols or n milliseconds, and the carrier wave of the PDSCH is the same as the carrier wave of the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI, taking the transmission beam of the first PDSCH in the PDSCH scheduled by the DCI as the transmission beam of the PDSCH; otherwise, using the beam of the activated TCI with the smallest ID available for the PDSCH in the activated subset bandwidth BWP in the scheduling cell as the transmission beam of the PDSCH.

According to a third aspect of the present disclosure, an apparatus for determining a physical downlink shared channel PDSCH transmission beam is provided, which includes: a downlink control information receiving unit, configured to receive downlink control information DCI, where the DCI is used to schedule a plurality of PDSCHs; a time domain interval acquiring unit, configured to determine a time domain interval between the PDSCH and the DCI in the multiple PDSCHs; and a transmission beam acquiring unit, configured to determine a transmission beam used by the PDSCH according to the time domain interval.

According to a fourth aspect of the present disclosure, there is provided a processor-readable storage medium, wherein the processor-readable storage medium stores a computer program executable by a processor to perform the method of the first aspect.

In this technical solution, determining a transmission beam used by the PDSCH according to a relationship between the DCI and the plurality of PDSCHs scheduled by the DCI can avoid losing DMRS joint channel estimation gain and gain for receiving PDSCH on the DCI beam.

According to the technology of the application, the problem that each PDSCH receiving beam is determined when a plurality of PDSCHs are called by single DCI is solved, the DMRS joint channel estimation gain is prevented from being lost, the gain of receiving the PDSCH on the beam of the DCI is avoided, and the transmission efficiency of signals is improved.

It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present disclosure, nor do they limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.

Drawings

The drawings are included to provide a better understanding of the present solution and are not intended to limit the present application. Wherein:

fig. 1 is a schematic flowchart of a method for determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 2 is a flowchart illustrating a method for determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 3 is a schematic flowchart of a method for determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 4 is a flowchart illustrating a method for determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 5 is a flowchart illustrating a method for determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 6 is a flowchart illustrating a method for determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 7 is a flowchart illustrating a method for determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 8 is a flowchart illustrating a method for determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 9 is a flowchart illustrating a method for determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 10 is a flowchart illustrating a method for determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 11 is a flowchart illustrating a method for determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 12 is a flowchart illustrating a method for determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 13 is a schematic diagram of one possible embodiment of determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 14 is a schematic diagram of one possible embodiment of determining a PDSCH transmission beam according to the embodiment of the present application;

fig. 15 is a schematic diagram of one possible embodiment of determining a PDSCH transmission beam according to the embodiment of the present application;

fig. 16 is a schematic diagram of one possible embodiment of determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 17 is a schematic structural diagram of an apparatus for determining a PDSCH transmission beam according to an embodiment of the present application;

fig. 18 is a schematic structural diagram of an apparatus for determining a PDSCH transmission beam of a physical downlink shared channel according to an embodiment of the present application.

Detailed Description

The following description of the exemplary embodiments of the present application, taken in conjunction with the accompanying drawings, includes various details of the embodiments of the application to assist in understanding, which are to be considered exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.

The following describes a method, a terminal, a network side device, an apparatus and a storage medium for determining a physical downlink shared channel PDSCH transmission beam according to an embodiment of the present application with reference to the drawings.

Currently, a 5G new air interface supports a single Downlink Control Information (DCI) to schedule a Physical Downlink Shared Channel (PDSCH) of multiple Transport Blocks (TBs), and there are two methods for determining a receiving beam used by each PDSCH scheduled by the single DCI. The method comprises the following steps: the receiving beams used by all PDSCHs are consistent with the receiving beam used by the first PDSCH in the time domain. The method 2 comprises the following steps: acquiring the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols spaced in a time domain between each PDSCH scheduled by the DCI and the DCI, comparing the number of OFDM symbols between the PDSCH and the DCI with the size of a quasi-co-location time duration (timeduration forqcl), and if the number of spaced OFDM symbols is greater than or equal to the timeduration forqcl, receiving the PDSCH in a transmission beam of the DCI by the terminal; if the number of spaced OFDM symbols is less than the timeduration forqcl, the terminal receives the PDSCH on a transmission beam used by a resource control set (core set) which is closest to the PDSCH in the time domain and has the smallest ID.

For each PDSCH in multiple PDSCHs scheduled by the same DCI, the prior art all uses one of two methods to determine the beam used for receiving the PDSCH. In this way, the terminal may not be able to perform joint channel estimation to obtain DMRS (demodulation reference Signal) joint channel estimation gain, or may not be able to obtain gain for receiving PDSCH on a DCI beam.

However, there is no method for determining whether to use method 1 or method 2 to determine a transmission beam used by the PDSCH when one DCI schedules a plurality of PDSCHs.

Based on this, the embodiment of the present application provides a method for determining a physical downlink shared channel PDSCH transmission beam. The method specifically comprises the following steps: receiving Downlink Control Information (DCI), wherein the DCI is used for scheduling a plurality of PDSCHs; determining a time domain spacing between the PDSCH and the DCI in the plurality of PDSCHs; and determining the transmission beam used by the PDSCH according to the time domain interval. Therefore, the transmission beam used by the PDSCH is determined according to the relation between the DCI and the PDSCHs scheduled by the DCI, the DMRS joint channel estimation can be effectively carried out, the DMRS joint channel estimation gain is obtained, the gain of receiving the PDSCH on the beam of the DCI is effectively obtained, and the transmission efficiency of signals is improved.

To facilitate understanding, terms referred to in the present application are introduced.

1. Downlink Control Information (DCI)

The DCI is carried by a Physical Downlink Control Channel (PDCCH), and may include uplink and downlink resource allocation, transmission receive point (TCI), power control, and the like. The PDCCH is a physical channel for carrying downlink scheduling information.

2. Control resource set (CORESET)

CORESET is a physical resource set for PDCCH, and is configured with 6 consecutive frequency domain Physical Resource Blocks (PRBs) as resource granularity. The frequency domain resources in the core set may be continuous or discontinuous, the time domain includes continuous 1 to 3 OFDM symbols, in one bandwidth part (BWP), the base station may configure at most 3 core sets for a User Equipment (UE), transmission beams used by each core set may be different, and the base station may transmit a PDCCH through different downlink beams, thereby obtaining different gains.

3. Quasi co-location time (TimeDurationForQCL)

In the existing standard, the timeduration for qcl is the minimum number of OFDM symbols required by the terminal for the TCI indication in the received DCI, and if the number of OFDM symbols is greater than or equal to the timeduration for qcl, the DCI requires the terminal to switch beams when receiving a Physical Downlink Shared Channel (PDSCH).

Fig. 1 is a flowchart illustrating a method for determining a transmission beam of a PDSCH (physical downlink shared channel) according to an embodiment of the present application. The technical scheme provided by the embodiment of the application can be suitable for various systems, particularly 5G systems. For example, the applicable system may be a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS) system, a long term evolution (long term evolution, LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD) system, an LTE-a (long term evolution) system, a universal mobile system (universal mobile telecommunications system, UMTS), a universal internet Access (WiMAX) system, a New Radio Network (NR) system, etc. These various systems include terminal devices and network devices. The System may further include a core network portion, such as an Evolved Packet System (EPS), a 5G System (5 GS), and the like.

As shown in fig. 1, the method for determining a PDSCH transmission beam of a physical downlink shared channel includes:

step 101, receiving downlink control information DCI, where the DCI is used to schedule a plurality of PDSCHs.

In this embodiment, the base station may send the DCI to the terminal, where the DCI is used to schedule the multiple PDSCHs, and the DCI may include uplink and downlink resource allocation, transmission configuration indication, power control, and the like.

Step 102, determining a time domain interval between the PDSCH and the DCI among the multiple PDSCHs.

And 103, determining a transmission beam used by the PDSCH according to the time domain interval.

In this embodiment, the transmission beam used by the PDSCH may be determined based on the transmission beam of the DCI, or the transmission beam used by the PDSCH may be determined based on the transmission beam of the first PDSCH scheduled by the DCI in the time domain.

In an embodiment of the present application, the time domain interval may be a number of orthogonal frequency division multiplexing, OFDM, symbols separated in a time domain by the DCI and the PDSCH.

As shown in fig. 2, in an embodiment of the present application, the determining a transmission beam used by the PDSCH according to the time domain interval includes:

step 201, if the time domain interval is less than a quasi co-location duration timeduration forqcl and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, using a transmission beam of a control resource set CORESET closest to the PDSCH and having a smallest ID as a transmission beam used by the PDSCH.

Step 202, if the time domain interval is smaller than a quasi co-location duration timeduration forqcl and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, using a transmission beam of the first PDSCH in the time domain scheduled by the DCI as a transmission beam used by the PDSCH.

Step 203, if the time domain interval is smaller than the timeduration forqcl, the PDSCH is the first PDSCH in the time domain scheduled by the DCI, a transition interval symbol exists before the PDSCH data, and the sum of the time domain interval and the transition interval symbol is greater than or equal to the timeduration forqcl, then the transmission beam of the DCI is used as the transmission beam of the PDSCH.

The timeduration forqcl is the minimum number of OFDM symbols required by the TCI indication in the DCI that the terminal can apply to receive, and if the number of OFDM symbols is greater than or equal to the timeduration forqcl, the DCI requires the terminal to switch transmission beams when receiving the PDSCH.

As shown in fig. 13, in one possible embodiment of the present application, DCI1 schedules three PDSCHs: PDSCH1, PDSCH2, PDSCH3. The base station indicates the transmission beam of PDCCH1 as beam 1 and dci1 is carried by PDCCH 1. The transmission beam of DCI1 is beam 3. The time domain interval between PDSCH1 and DCI1 is smaller than the timeduration forqcl, and PDSCH1 is the first PDSCH in the time domain scheduled by the DCI, so the transmission beam of the control resource set CORESET closest to PDSCH1 and having the smallest ID is used as the transmission beam for PDSCH1, that is, beam 1 is used as the transmission beam for PDSCH 1.

As shown in fig. 3, in an embodiment of the present application, the determining a transmission beam used by the PDSCH according to the time domain interval includes:

step 301, if the time domain interval is greater than or equal to the timeduration for qcl and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, using the transmission beam of the DCI as the transmission wave of the PDSCH.

Step 302, if the time domain interval is greater than or equal to the timeduration for qcl and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, determining a transmission beam used by the PDSCH according to difference information between the PDSCH and a previous PDSCH in the PDSCH scheduled by the DCI, the previous PDSCH having the smallest time domain interval with the PDSCH.

As shown in fig. 4, in an embodiment of the present application, the determining, according to difference information between the PDSCH and a previous PDSCH that is the PDSCH with the smallest time domain interval from the PDSCH in the PDSCH scheduled by the DCI, a transmission beam used by the PDSCH includes:

step 401, determining whether the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI.

Step 402, determining whether a time domain interval between the PDSCH and a previous PDSCH with a smallest time domain interval with the PDSCH is greater than or equal to n OFDM symbols or n milliseconds, where n is an OFDM symbol number or a millisecond threshold.

Step 403, determining whether the carrier of the PDSCH is the same as the carrier of the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI.

Step 404, acquiring the transmission beam of the PDSCH.

As shown in fig. 5, in an embodiment of the present application, the acquiring the transmission beam of the PDSCH includes:

step 501, if the DCI transmission beam is the same as a transmission beam used by a previous PDSCH of the DCI-scheduled PDSCH with a minimum time interval to the PDSCH, the PDSCH is less than n OFDM symbols or n milliseconds from the PDSCH with the minimum time interval to the PDSCH, and the PDSCH carrier is the same as the carrier of the previous PDSCH of the DCI-scheduled PDSCH with the minimum time interval to the PDSCH, then taking the transmission beam of the first PDSCH of the DCI-scheduled PDSCH as the PDSCH transmission beam, where n is a positive integer;

step 502, otherwise, the transmission beam indicated by the DCI is used as the transmission beam of the PDSCH.

And taking the transmission beam of the first PDSCH in the PDSCH scheduled by the DCI as the transmission beam of the PDSCH, namely carrying out DMRS joint channel estimation, acquiring the DMRS joint channel estimation, and simultaneously acquiring the gain of receiving the PDSCH on the beam of the DCI, thereby improving the transmission efficiency.

As shown in fig. 13, in one possible embodiment of the present application, DCI1 schedules three PDSCHs: PDSCH1, PDSCH2, PDSCH3. The base station indicates that the transmission beam of PDCCH1 is beam 1 and DCI1 is carried by PDCCH1 so that the transmission beam of DCI1 is beam 1. The transmission beam indicated by DCI1 is beam 3. The transmission beam of PDSCH2 is beam 2. The time domain interval between PDSCH3 and DCI1 is greater than the timeduration forcqcl, and the transmission beam of the DCI1 is different from the previous PDSCH, i.e., the PDSCH2, with the smallest time domain interval with the PDSCH3 in the PDSCH scheduled by the DCI1, so that the transmission beam indicated by the DCI1, i.e., the beam 3, is used as the transmission beam of the PDSCH3.

As shown in fig. 14, in one possible embodiment of the present application, DCI1 schedules three PDSCHs: PDSCH1, PDSCH2, PDSCH3. The base station indicates that the transmission beam of PDCCH1 is beam 1 and DCI1 is carried by PDCCH1, so the transmission beam of DCI1 is beam 1. The transmission beam indicated by DCI1 is beam 3. The time domain interval between the PDSCH2 and the DCI1 is greater than the TimeDurationForQCL when the transmission beam of the PDSCH2 is beam 1, PDSCH3, and the time domain interval between the PDSCH and the PDSCH scheduled by the DCI1, which is the previous PDSCH with the smallest time domain interval between the PDSCH and the previous PDSCH, is greater than or equal to n OFDM symbols or n milliseconds, so the transmission beam indicated by the DCI1, namely beam 3, is taken as the transmission beam of the PDSCH.

As shown in fig. 15, in one possible embodiment of the present application, DCI1 schedules three PDSCHs: PDSCH1, PDSCH2, PDSCH3. The base station indicates that the transmission beam of PDCCH1 is beam 1 and DCI1 is carried by PDCCH1, so the transmission beam of DCI1 is beam 1. The transmission beam indicated by DCI1 is beam 3. The time domain interval between PDSCH3 and DCI1 is greater than the TimeDurationForQCL, and the carrier of PDSCH3 is different from the carrier of PDSCH2, which is the previous PDSCH with the smallest time domain interval between PDSCH in the PDSCH scheduled by DCI, so that the beam 3, which is the transmission beam indicated by DCI1, is used as the transmission beam of PDSCH.

As shown in fig. 16, in one possible embodiment of the present application, DCI1 schedules three PDSCHs: PDSCH1, PDSCH2, PDSCH3. The base station indicates that the transmission beam of PDCCH1 is beam 1 and DCI1 is carried by PDCCH1 so that the transmission beam of DCI1 is beam 1. The transmission beam indicated by DCI1 is beam 3. The time domain interval between the beam 1, pdschh 3 and DCI1 of the PDSCH2 is greater than the timeduration forqcl, the transmission beam of the DCI1 is the same as the transmission beam used by the PDSCH2, which is the previous PDSCH with the smallest time domain interval with the PDSCH3 in the PDSCH scheduled by the DCI1, and the time domain interval between the PDSCH2 and the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI1, that is, the time domain interval of the PDSCH2 is smaller than n OFDM symbols or n milliseconds, and the carrier of the PDSCH is the same as the carrier of the PDSCH2, which is the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI1, so that the transmission beam 1 of the first PDSCH in the PDSCH scheduled by the DCI is taken as the transmission beam of the PDSCH3.

As shown in fig. 6, in an embodiment of the present application, after receiving the downlink control information DCI as shown in fig. 1, the method further includes:

step 601, determining whether there is a PDCCH overlapping with the PDSCH in the time domain.

Step 602, if there is a PDCCH overlapping the PDSCH in the time domain, using the transmission beam of the PDCCH as the transmission beam of the PDSCH.

As shown in fig. 13, in one possible embodiment of the present application, DCI1 schedules three PDSCHs: PDSCH1, PDSCH2, PDSCH3. The base station indicates that the transmission beam of PDCCH1 is beam 1 and that dci1 is carried by PDCCH 1. The transmission beam of DCI1 is beam 1. The transmission beam indicated by DCI1 is beam 3. The base station indicates the transmission beam of PDCCH2 as beam 2. Since the time domain interval between PDSCH2 and DCI1 is greater than the timeduration forqcl and PDCCH2 and PDSCH2 overlap in the time domain, the transmission beam of PDCCH2 is used as the transmission beam of PDSCH2, that is, PDSCH2 is transmitted on beam 2.

As shown in fig. 7, in an embodiment of the present application, after determining the transmission beam used by the PDSCH according to the time domain interval as shown in fig. 1, the method further includes:

step 701, determining whether a plurality of transmission configuration indication TCIs are indicated in the DCI, where the plurality of TCIs correspond to one or more PDSCHs in the PDSCH scheduled by the DCI;

step 702, if multiple TCIs are indicated in the DCI, the time domain interval is greater than or equal to the timeduration for qcl, and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, using a transmission beam of the TCI corresponding to the PDSCH in the DCI as a transmission beam of the PDSCH;

step 703, if multiple TCIs are indicated in the DCI, the time domain interval is greater than or equal to the timeduration for qcl, and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, determining a transmission beam used by the PDSCH according to difference information between the PDSCH and the previous PDSCH in the PDSCH scheduled by the DCI, the previous PDSCH having the smallest time domain interval with the PDSCH.

In a possible case, one DCI includes a plurality of TCIs, where the plurality of TCIs respectively corresponding to different PDSCHs, and when a transmission beam of the PDSCH is acquired, the TCI is determined according to the TCI corresponding to the PDSCH.

As shown in fig. 8, in an embodiment of the present application, the determining, according to difference information between the PDSCH and a previous PDSCH that is the PDSCH scheduled by the DCI and has the smallest time domain interval with the PDSCH, a transmission beam used by the PDSCH includes:

step 801, determining whether the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH in the PDSCH scheduled by the DCI and having the smallest time domain interval with the PDSCH;

step 802, determining whether a time domain interval between the PDSCH and a previous PDSCH with a smallest time domain interval with the PDSCH is greater than or equal to n OFDM symbols or n milliseconds, where n is an OFDM symbol number or a millisecond threshold;

step 803, determining whether the carrier of the PDSCH is the same as the carrier of the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI;

step 804, acquiring the transmission beam of the PDSCH.

As shown in fig. 9, in an embodiment of the present application, the acquiring the transmission beam of the PDSCH includes:

step 901, if the DCI transmission beam is the same as the transmission beam used by the previous PDSCH of the DCI-scheduled PDSCH with the smallest time interval with the PDSCH, the PDSCH is less than n OFDM symbols or n milliseconds from the previous PDSCH of the DCI-scheduled PDSCH with the smallest time interval with the PDSCH, and the PDSCH carrier is the same as the carrier of the previous PDSCH of the DCI-scheduled PDSCH with the smallest time interval with the PDSCH, then taking the transmission beam of the first PDSCH of the DCI-scheduled PDSCH as the PDSCH transmission beam;

step 902, otherwise, taking the transmission beam of the TCI corresponding to the PDSCH in the DCI as the transmission beam of the PDSCH.

As shown in fig. 10, in an embodiment of the present application, the determining a transmission beam used by the PDSCH according to the time domain interval includes:

step 1001, determining whether a TCI field exists in the DCI;

step 1002, if there is no TCI field in the DCI, the time domain interval is greater than or equal to the timeduration for qcl, and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, using a beam of a TCI with a minimum activated ID available for the PDSCH in the activated subset bandwidth BWP in the scheduling cell as a transmission beam of the PDSCH;

step 1003, if the TCI field does not exist in the DCI, the time domain interval is greater than or equal to the timeduration forqcl, and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, determining a transmission beam used by the PDSCH according to difference information between the PDSCH and a previous PDSCH in the PDSCH scheduled by the DCI, the previous PDSCH having a smallest time domain interval with the PDSCH.

In one possible case, the PDCCH carrying the DCI and the PDSCH scheduled by the DCI are not on the same carrier, and there is no TCI field in DCI. Depending on the nature of the system configuration, some information fields may or may not be present in the DCI. For the case of DCI without TCI field, we need to accept the PDSCH according to the beam of activated TCI with the smallest ID available for the PDSCH in the subset bandwidth BWP activated in the scheduling cell.

As shown in fig. 11, in an embodiment of the present application, the determining, according to difference information between the PDSCH and a previous PDSCH that is the PDSCH scheduled by the DCI and has the smallest time domain interval with the PDSCH, a transmission beam used by the PDSCH includes:

step 1101, determining whether the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH in the PDSCH scheduled by the DCI and having the smallest time domain interval with the PDSCH;

step 1102, determining whether a time domain interval between the PDSCH and a previous PDSCH with a smallest time domain interval with the PDSCH, among the PDSCHs scheduled by the DCI, is greater than or equal to n OFDM symbols or n milliseconds, where n is an OFDM symbol number or a millisecond threshold;

step 1103, determining whether the carrier of the PDSCH is the same as the carrier of the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI;

and 1104, acquiring a transmission beam of the PDSCH.

As shown in fig. 12, in an embodiment of the present application, the acquiring the transmission beam of the PDSCH includes:

step 1201, if the DCI transmission beam is the same as the transmission beam used by the previous PDSCH with the smallest time domain interval with the PDSCH in the DCI-scheduled PDSCH, the PDSCH is less than n OFDM symbols or n milliseconds with the smallest time domain interval with the PDSCH in the DCI-scheduled PDSCH, and the PDSCH carrier is the same as the carrier of the previous PDSCH with the smallest time domain interval with the PDSCH in the DCI-scheduled PDSCH, taking the transmission beam of the first PDSCH in the DCI-scheduled PDSCH as the PDSCH transmission beam;

step 1202, otherwise, using the beam of the activated TCI with the smallest ID available for the PDSCH in the activated subset bandwidth BWP in the scheduling cell as the transmission beam of the PDSCH.

In order to implement the foregoing embodiment, the embodiment of the present application further provides a device for determining a transmission beam of a PDSCH. Fig. 17 is a schematic structural diagram of a device for determining a transmission beam of a PDSCH according to an embodiment of the present application. The network device according to the embodiment of the present application may be a base station, and the base station may include a plurality of cells for serving a terminal. A base station may also be referred to as an access point, or a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or by other names, depending on the particular application. The network device may be configured to exchange received air frames with Internet Protocol (IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a Base Transceiver Station (BTS) in a Global System for Mobile communications (GSM) or a Code Division Multiple Access (CDMA), a network device (NodeB) in a Wideband Code Division Multiple Access (WCDMA), an evolved Node B (eNB) or an e-NodeB) in a Long Term Evolution (LTE) System, a 5G Base Station (gNB) in a 5G network architecture (next generation System), a Home evolved Node B (HeNB), a relay Node (relay Node), a Home Base Station (femto), a pico Base Station (pico), and the like, which are not limited in the embodiments of the present application. In some network configurations, a network device may include Centralized Unit (CU) nodes and Distributed Unit (DU) nodes, which may also be geographically separated.

As shown in fig. 17, the apparatus for determining a PDSCH transmission beam includes: memory 1710, transceiver 1720, and processor 1730.

A memory 1710 for storing a computer program; a transceiver 1720 for transceiving data under the control of the processor 1730; a processor 1730 for reading the computer program in the memory 1710 and performing the following operations:

receiving Downlink Control Information (DCI), wherein the DCI is used for scheduling a plurality of PDSCHs.

Determining a time domain spacing between the PDSCH and the DCI in the plurality of PDSCHs.

And determining a transmission beam used by the PDSCH according to the time domain interval.

A transceiver 1720 for receiving and transmitting data under the control of a processor 1730.

In fig. 17, among other things, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1730, and various circuits of memory, represented by memory 1710, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1720 may be a plurality of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over transmission media including wireless channels, wired channels, optical fiber cables, and the like. For different user devices, the user interface may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1730 is responsible for managing the bus architecture and general processing, and the memory 1710 may store data used by the processor 1730 in performing operations.

Optionally, the processor 1730 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and the processor 1730 may also adopt a multi-core architecture.

Processor 1730 is configured to invoke the computer program stored in the memory to execute the method of fig. 1 provided by the embodiments of the present application according to the obtained executable instructions. Processor 1730 and memory 1710 may also be physically located separately.

In a possible implementation manner of the embodiment of the present application, the time domain interval is an orthogonal frequency division multiplexing OFDM symbol number of the DCI and the PDSCH spaced in the time domain.

In a possible implementation manner of the embodiment of the present application, the determining, according to the time domain interval, a transmission beam used by the PDSCH includes:

if the time domain interval is smaller than the quasi-co-location duration TimeDurationForQCL and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, taking the transmission beam of a control resource set CORESET which is closest to the PDSCH and has the smallest ID as the transmission beam used by the PDSCH;

if the time domain interval is greater than or equal to the TimeDurationForQCL and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, taking the transmission beam of the DCI as the transmission beam of the PDSCH;

and if the time domain interval is greater than or equal to the TimeDurationForQCL and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, determining a transmission beam used by the PDSCH according to the difference information between the PDSCH and the previous PDSCH with the smallest time domain interval between the PDSCH and the PDSCH scheduled by the DCI.

In a possible implementation manner of the embodiment of the present application, the determining, according to difference information between the PDSCH and a previous PDSCH that has a smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI, a transmission beam used by the PDSCH includes:

determining whether the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI;

determining whether a time domain interval between the PDSCH and a previous PDSCH with a smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI is larger than or equal to n OFDM symbols or n milliseconds, wherein n is the number of the OFDM symbols or a millisecond threshold value;

determining whether the carrier of the PDSCH is the same as the carrier of the previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI;

acquiring a transmission beam of the PDSCH.

In a possible implementation manner of this embodiment, the acquiring a transmission beam of the PDSCH includes:

if the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI, the time interval between the PDSCH and the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI is smaller than n OFDM symbols or n milliseconds, and the carrier wave of the PDSCH is the same as the carrier wave of the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI, taking the transmission beam of the first PDSCH in the PDSCH scheduled by the DCI as the transmission beam of the PDSCH, wherein n is a positive integer;

otherwise, the transmission beam indicated by the DCI is taken as the transmission beam of the PDSCH.

In a possible implementation manner of this embodiment, after receiving the downlink control information DCI, the method further includes:

determining whether a PDCCH overlaps the PDSCH in a time domain;

and if the PDCCH and the PDSCH are overlapped on the time domain, taking a transmission beam of the PDCCH as a transmission beam of the PDSCH.

determining whether a plurality of Transmission Configuration Indication (TCIs) are indicated in the DCI, the plurality of TCIs corresponding to one or more of the DCI-scheduled PDSCHs;

if a plurality of TCIs are indicated in the DCI, the time domain interval is greater than or equal to the TimeDurationForQCL, and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, taking a transmission beam of the TCI corresponding to the PDSCH in the DCI as a transmission beam of the PDSCH;

In a possible implementation manner of the embodiment of the present application, the determining, according to difference information between the PDSCH and a previous PDSCH that is the PDSCH scheduled by the DCI and has the smallest time domain interval with the PDSCH, a transmission beam used by the PDSCH includes:

acquiring a transmission beam of the PDSCH.

In a possible implementation manner of this embodiment, the acquiring the transmission beam of the PDSCH includes:

if the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time interval with the PDSCH in the PDSCH scheduled by the DCI, the time interval between the PDSCH and the previous PDSCH with the smallest time interval with the PDSCH in the PDSCH scheduled by the DCI is smaller than n OFDM symbols or n milliseconds, and the carrier of the PDSCH is the same as the carrier of the previous PDSCH with the smallest time interval with the PDSCH in the PDSCH scheduled by the DCI, taking the transmission beam of the first PDSCH in the PDSCH scheduled by the DCI as the transmission beam of the PDSCH;

otherwise, the transmission beam corresponding to the TCI of the PDSCH in the DCI is used as the transmission beam of the PDSCH.

determining whether a TCI field is present in the DCI;

if the TCI domain does not exist in the DCI, the time domain interval is greater than or equal to the TimeDurationForQCL, and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, using a beam of the TCI with the minimum activated ID available for the PDSCH in the activated subset bandwidth BWP in a scheduling cell as a transmission beam of the PDSCH;

and if the DCI does not have a TCI domain, the time domain interval is greater than or equal to the TimeDurationForQCL, and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, determining a transmission beam used by the PDSCH according to the difference information between the PDSCH and the previous PDSCH in the PDSCH scheduled by the DCI, wherein the previous PDSCH has the smallest time domain interval with the PDSCH.

determining whether a transmission beam of the DCI is the same as a transmission beam used by a previous PDSCH with the smallest time domain interval with the PDSCH in the PDSCH scheduled by the DCI;

determining whether a time domain interval between the PDSCH and a previous PDSCH in the PDSCH scheduled by the DCI, which is the PDSCH with the smallest time domain interval with the PDSCH, is greater than or equal to n OFDM symbols or n milliseconds, wherein the n is an OFDM symbol number or a millisecond threshold;

acquiring a transmission beam of the PDSCH.

if the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI, the time interval between the PDSCH and the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI is smaller than n OFDM symbols or n milliseconds, and the carrier wave of the PDSCH is the same as the carrier wave of the previous PDSCH with the smallest time interval between the PDSCH and the PDSCH scheduled by the DCI, taking the transmission beam of the first PDSCH in the PDSCH scheduled by the DCI as the transmission beam of the PDSCH;

otherwise, using the beam of the activated TCI with the smallest ID available for the PDSCH in the activated subset bandwidth BWP in the scheduling cell as the transmission beam of the PDSCH.

According to an embodiment of the present application, a device for determining a PDSCH transmission beam of a physical downlink shared channel is further provided, and fig. 18 is a schematic structural diagram of the device for determining a PDSCH transmission beam of a physical downlink shared channel provided in the embodiment of the present application.

It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a processor readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.

As shown in fig. 18, the PDSCH transmission beam determining apparatus 1800 includes:

a downlink control information receiving unit 1810 configured to receive downlink control information DCI, where the DCI is used to schedule a plurality of PDSCHs;

a time domain interval obtaining unit 1820, configured to determine a time domain interval between the PDSCH and the DCI in the multiple PDSCHs;

a transmission beam obtaining unit 1830, configured to determine a transmission beam used by the PDSCH according to the time domain interval.

In a possible implementation manner of this embodiment, the downlink control information receiving unit 1810 is further configured to receive downlink control information DCI, where the DCI is used to schedule a plurality of PDSCHs, and the time interval is an orthogonal frequency division multiplexing OFDM symbol number of the DCI and the PDSCHs spaced in the time domain.

In a possible implementation manner of this embodiment of the present application, the transmission beam obtaining unit 1830 is configured to determine, according to the time domain interval, a transmission beam used by the PDSCH, where the determining, according to the time domain interval, the transmission beam used by the PDSCH includes:

In a possible implementation manner of this embodiment of the present application, the transmission beam obtaining unit 1830 is configured to determine a transmission beam used by the PDSCH according to the time domain interval, where the determining the transmission beam used by the PDSCH according to the time domain interval includes:

In a possible implementation manner of the embodiment of the present application, the transmission beam obtaining unit 1830 is configured to determine a transmission beam used by the PDSCH according to the time domain interval, where the determining a transmission beam used by the PDSCH according to difference information between the PDSCH and a previous PDSCH in the PDSCH scheduled by the DCI and having a smallest time domain interval with the PDSCH includes:

acquiring a transmission beam of the PDSCH.

In a possible implementation manner of this embodiment of the present application, the transmission beam obtaining unit 1830 is configured to determine a transmission beam used by the PDSCH according to the time domain interval, where the obtaining the transmission beam of the PDSCH includes:

if the transmission beam of the DCI is the same as the transmission beam used by the previous PDSCH with the smallest time interval with the PDSCH in the PDSCH scheduled by the DCI, the time interval between the PDSCH and the previous PDSCH with the smallest time interval with the PDSCH in the PDSCH scheduled by the DCI is smaller than n OFDM symbols or n milliseconds, and the carrier of the PDSCH is the same as the carrier of the previous PDSCH with the smallest time interval with the PDSCH in the PDSCH scheduled by the DCI, taking the transmission beam of the first PDSCH in the PDSCH scheduled by the DCI as the transmission beam of the PDSCH, wherein n is a positive integer;

otherwise, the transmission beam indicated by the DCI is used as the transmission beam of the PDSCH.

In a possible implementation manner of this embodiment, the downlink control information receiving unit 1810 is further configured to receive downlink control information DCI, where the DCI is used to schedule a plurality of PDSCHs, and after the receiving the downlink control information DCI, the method further includes:

determining whether a PDCCH overlaps the PDSCH in a time domain;

acquiring a transmission beam of the PDSCH.

otherwise, taking the transmission beam corresponding to the TCI of the PDSCH in the DCI as the transmission beam of the PDSCH.

determining whether a TCI field is present in the DCI;

acquiring a transmission beam of the PDSCH.

It should be noted that, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functioning unit and sold or used as a stand-alone product, may be stored in a processor readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network-side device, etc.) or a processor (processor) to execute all or part of the steps of the method of the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

In order to implement the foregoing embodiments, the present application also proposes a processor-readable storage medium.

The processor-readable storage medium stores a computer program for causing the processor to execute the method for determining a PDSCH transmission beam according to the embodiment of fig. 1.

The processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including but not limited to magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memories (NAND FLASH), solid State Disks (SSDs)), among others.

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, 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 embodiments of 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-executable instructions. These computer-executable 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 processor-executable instructions may also be stored in a processor-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 processor-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 processor-executable 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 should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present application may be executed in parallel, sequentially, or in different orders, and the present invention is not limited thereto as long as the desired results of the technical solutions disclosed in the present application can be achieved.

It should be clear that the above detailed description does not constitute a limitation of the scope of protection of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for determining a transmission beam of a Physical Downlink Shared Channel (PDSCH), the method comprising:

receiving Downlink Control Information (DCI), wherein the DCI is used for scheduling a plurality of PDSCHs;

determining a time domain spacing between the PDSCH and the DCI in the plurality of PDSCHs;

and determining the transmission beam used by the PDSCH according to the time domain interval.

2. The method of claim 1, wherein the time domain spacing is a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols that the DCI is spaced from the PDSCH in a time domain.

3. The method of claim 1, wherein the determining the transmission beam for the PDSCH according to the time domain interval comprises:

if the time domain interval is less than a quasi-co-location duration TimeDurationForQCL and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, taking a transmission beam of the first PDSCH in the time domain scheduled by the DCI as a transmission beam used by the PDSCH;

4. The method of claim 1, wherein the determining transmission beams for the PDSCH according to the time-domain interval comprises:

5. The method of claim 4, wherein the determining the transmission beam used by the PDSCH according to the difference information between the PDSCH and a previous PDSCH with a smallest time interval with the PDSCH in the PDSCH scheduled by the DCI comprises:

acquiring a transmission beam of the PDSCH.

6. The method of claim 5, wherein the obtaining the transmission beam of the PDSCH comprises:

7. The method according to claim 1, 3 or 4, further comprising, after said receiving downlink control information DCI:

8. The method of claim 1, wherein the determining transmission beams for the PDSCH according to the time-domain interval comprises:

determining whether a plurality of Transmission Configuration Indication (TCIs) are indicated in the DCI, the plurality of TCIs corresponding to one or more of the DCI scheduled PDSCHs;

9. The method of claim 8, further characterized in that the determining the transmission beam used by the PDSCH according to the difference information between the PDSCH and a previous PDSCH with a smallest time interval with the PDSCH in the DCI scheduled PDSCH comprises:

acquiring a transmission beam of the PDSCH.

10. The method of claim 9, further characterized in that the acquiring the transmission beam of the PDSCH comprises:

11. The method of claim 1, wherein the determining transmission beams for the PDSCH according to the time-domain interval comprises:

determining whether a TCI field is present in the DCI;

if the TCI domain does not exist in the DCI, the time domain interval is greater than or equal to the TimeDurationForQCL, and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, using a beam of the TCI with the smallest activated ID available for the PDSCH in a subset bandwidth BWP activated in a scheduling cell as a transmission beam of the PDSCH;

if the TCI domain does not exist in the DCI, the time domain interval is greater than or equal to the TimeDurationForQCL, and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, determining a transmission beam used by the PDSCH according to the difference information between the PDSCH and the previous PDSCH with the smallest time domain interval between the PDSCH and the PDSCH scheduled by the DCI.

12. The method of claim 11, further characterized in that the determining the transmission beam used by the PDSCH according to the difference information between the PDSCH and a previous PDSCH of the PDSCH scheduled by the DCI with a smallest time interval from the PDSCH comprises:

acquiring a transmission beam of the PDSCH.

13. The method of claim 12, further characterized in that the acquiring the transmission beam of the PDSCH comprises:

otherwise, taking the beam of the activated TCI with the smallest ID available for the PDSCH in the activated subset bandwidth BWP in the scheduling cell as the transmission beam of the PDSCH.

14. An apparatus for determining a Physical Downlink Shared Channel (PDSCH) transmission beam, comprising a memory, a transceiver, and a processor:

a memory for storing a computer program; a transceiver for transceiving data under the control of the processor; a processor for reading the computer program in the memory and performing the following operations:

15. The apparatus of claim 14, wherein the time domain spacing is a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols that the DCI is spaced from the PDSCH in a time domain.

16. The apparatus of claim 14, wherein the determining the transmission beam for the PDSCH according to the time domain interval comprises:

if the time domain interval is smaller than a quasi co-location duration TimeDurationForQCL and the PDSCH is the first PDSCH in the time domain scheduled by the DCI, taking a transmission beam of a control resource set CORESET which is closest to the PDSCH and has the smallest ID as a transmission beam used by the PDSCH;

if the time domain interval is smaller than a quasi co-location duration TimeDurationForQCL and the PDSCH is not the first PDSCH in the time domain scheduled by the DCI, taking a transmission beam of the first PDSCH in the time domain scheduled by the DCI as a transmission beam used by the PDSCH;

17. The apparatus of claim 14, wherein the determining the transmission beam for the PDSCH according to the time domain interval comprises:

18. The apparatus of claim 17, wherein the determining a transmission beam used by the PDSCH according to the difference information between the PDSCH and a previous PDSCH that is temporally spaced from the PDSCH by the smallest time interval comprises:

acquiring a transmission beam of the PDSCH.

19. The apparatus of claim 18, wherein the obtaining the transmission beam of the PDSCH comprises:

20. The apparatus according to claim 14, 16 or 17, further comprising, after the receiving the downlink control information DCI:

21. The apparatus of claim 14, wherein the determining the transmission beam for the PDSCH according to the time domain interval comprises:

22. The apparatus of claim 21, further characterized in that the determining a transmission beam used by the PDSCH according to the difference information between the PDSCH and a previous PDSCH that is least temporally spaced from the PDSCH comprises:

acquiring a transmission beam of the PDSCH.

23. The apparatus of claim 22, further characterized in that the acquiring the transmission beam of the PDSCH comprises:

24. The apparatus of claim 14, wherein the determining the transmission beam for the PDSCH according to the time domain interval comprises:

determining whether a TCI field is present in the DCI;

25. The apparatus of claim 24, further characterized in that the determining a transmission beam used by the PDSCH according to the difference information between the PDSCH and a previous PDSCH of the PDSCH scheduled by the DCI with a smallest time interval with the PDSCH comprises:

acquiring a transmission beam of the PDSCH.

26. The apparatus of claim 25, further characterized in that the acquiring the transmission beam of the PDSCH comprises:

27. An apparatus for determining a Physical Downlink Shared Channel (PDSCH) transmission beam, comprising:

a downlink control information receiving unit, configured to receive downlink control information DCI, where the DCI is used to schedule a plurality of PDSCHs;

a time domain interval acquiring unit, configured to determine a time domain interval between the PDSCH and the DCI in the multiple PDSCHs;

a transmission beam acquiring unit, configured to determine a transmission beam used by the PDSCH according to the time domain interval.

28. A processor-readable storage medium, wherein the processor-readable storage medium stores a computer program executable by a processor to perform the method of any one of claims 1 to 13.