CN114666023A

CN114666023A - Method and apparatus for transmitting and receiving hybrid automatic repeat request acknowledgement information

Info

Publication number: CN114666023A
Application number: CN202110897705.8A
Authority: CN
Inventors: 付景兴; 孙霏菲; 张飒
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2020-10-21
Filing date: 2021-08-05
Publication date: 2022-06-24

Abstract

A method and apparatus for transmitting and receiving hybrid automatic repeat request acknowledgement (HARQ-ACK) information are provided. The method for transmitting hybrid automatic repeat request acknowledgement (HARQ-ACK) information comprises the following steps: receiving Downlink Control Information (DCI); receiving a PDSCH based on the DCI; and transmitting HARQ-ACK information of the PDSCH on an uplink serving cell or an uplink carrier.

Description

Method and apparatus for transmitting and receiving hybrid automatic repeat request acknowledgement information

Technical Field

The embodiment of the invention relates to the technical field of wireless communication, in particular to a method and equipment for transmitting Hybrid Automatic repeat Request Acknowledgement (HARQ-ACK) feedback information.

Background

In order to meet the increasing demand for wireless data communication services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or quasi-5G communication systems. Accordingly, the 5G or quasi-5G communication system is also referred to as a "super 4G network" or a "post-LTE system".

The 5G communication system is implemented in a higher frequency (millimeter wave) band, for example, a 60GHz band, to achieve a higher data rate. In order to reduce propagation loss of radio waves and increase transmission distance, beamforming, massive Multiple Input Multiple Output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming, massive antenna technology are discussed in the 5G communication system.

Further, in the 5G communication system, development of improvement of the system network is ongoing based on advanced small cells, cloud Radio Access Network (RAN), ultra dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multipoint (CoMP), reception side interference cancellation, and the like.

In 5G systems, hybrid FSK and QAM modulation (FQAM) and Sliding Window Superposition Coding (SWSC) have been developed as Advanced Coding Modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and Sparse Code Multiple Access (SCMA) as advanced access techniques.

Disclosure of Invention

The application provides a method for transmitting HARQ-ACK feedback information, and describes a method for transmitting HARQ-ACK of a multicast PDSCH.

In order to achieve the purpose, the following technical scheme is adopted in the application.

According to an aspect of an embodiment of the present invention, there is provided a method for transmitting hybrid automatic repeat request acknowledgement HARQ-ACK information, the method including: receiving Downlink Control Information (DCI); receiving a PDSCH based on the DCI; and transmitting HARQ-ACK information of the PDSCH on an uplink serving cell or an uplink carrier.

In one example, the uplink serving cell or uplink carrier is an uplink serving cell or uplink carrier that transmits PUCCH.

In one example, the uplink serving cell for transmitting the PUCCH is a Pcell or a Scell configured with PUCCH transmission.

In one example, the uplink serving cell or uplink carrier is a configured uplink serving cell or uplink carrier.

In one example, transmitting HARQ-ACK information for a PDSCH on an uplink serving cell or uplink carrier includes: determining a HARQ-ACK timing relationship; determining a transmission time unit of a PUCCH based on HARQ-ACK timing relationship indication time units and the HARQ-ACK timing relationship; and transmitting HARQ-ACK information in a transmission time unit of the PUCCH.

In one example, determining the HARQ-ACK timing relationship includes: and determining the HARQ-ACK timing relation based on the timing relation indication field in the DCI and the set of HARQ-ACK timing relation.

In one example, the timing relationship indication field is one timing relationship indication field in DCI, where the DCI includes at least 1 timing relationship indication field for respectively indicating at least one HARQ-ACK timing relationship.

In one example, the set of HARQ-ACK timing relationships is a set corresponding to the first PDSCH.

In one example, transmitting HARQ-ACK information for a PDSCH on an uplink serving cell or uplink carrier includes: receiving a referenced HARQ-ACK timing relationship indication time unit; determining a location where k1 is 0 based on the referenced HARQ-ACK timing relationship indication time unit and PDSCH reception time unit; determining a transmission time unit of the PUCCH based on the referenced HARQ-ACK timing relationship indication time unit and the PUCCH time unit; and transmitting HARQ-ACK information in a transmission time unit of the PUCCH, wherein k1 is a HARQ-ACK timing relationship, and a position at which k1 is 0 is a HARQ-ACK timing relationship reference point.

In one example, determining the location where k1 is 0 based on the referenced HARQ-ACK timing relationship indication time unit and PDSCH reception time unit comprises: when the PDSCH reception time unit is not greater than the reference HARQ-ACK timing relationship indication time unit, a position where k1 is 0 overlaps in time with the reception time unit of the PDSCH; or when the PDSCH receiving time unit is larger than the reference HARQ-ACK timing relation indication time unit, the position where k1 is 0 overlaps in time with a time period of one of the PDSCH receiving time units, which is referred to by the reference HARQ-ACK timing relation indication time unit length.

In one example, the overlapping of the position where k1 is 0 and the time period in which the HARQ-ACK timing relationship for one reference in the PDSCH receiving time unit indicates the time unit length in time comprises: the position where k1 is 0 overlaps in time with the time period in which the HARQ-ACK timing relationship for the first reference in the PDSCH reception time unit indicates the time unit length; or the position where k1 is 0 overlaps in time with the time period in which the HARQ-ACK timing relationship last referenced in the PDSCH reception time unit indicates the time unit length.

In one example, determining a transmission time unit of the PUCCH based on the referenced HARQ-ACK timing relationship indication time unit and the PUCCH time unit comprises: determining a k1 position based on the position where k1 is 0; when the PUCCH time unit is not less than the reference HARQ-ACK timing relationship indication time unit, the transmission time unit of the PUCCH overlaps in time with the k1 position; or when the PUCCH time unit is smaller than the reference HARQ-ACK timing relationship indication time unit, the transmission time unit of the PUCCH overlaps in time with a time period of one PUCCH time unit length in the k1 position.

In one example, the overlapping in time of the time segments of one PUCCH time unit length in the PUCCH transmission time unit k1 position includes: the transmission time unit of the PUCCH overlaps in time with the first PUCCH time unit length period in the k1 position or overlaps in time with the last PUCCH time unit length period in the k1 position.

According to another aspect of the embodiments of the present invention, there is provided a method for receiving hybrid automatic repeat request acknowledgement HARQ-ACK information, the method including: transmitting Downlink Control Information (DCI); transmitting the PDSCH based on the DCI; and receiving HARQ-ACK information of the PDSCH on an uplink serving cell or uplink carrier.

In one example, the method further comprises: sending a configuration message containing the configured uplink serving cell or uplink carrier.

In one example, the DCI includes: a HARQ-ACK timing relationship indication field.

In one example, the DCI includes at least 1 timing relationship indication field to indicate at least one HARQ-ACK timing relationship, respectively.

In one example, the HARQ-ACK timing relationship indication field indicates one of a set of HARQ-ACK timing relationships, and the set of HARQ-ACK timing relationships is a set corresponding to the first PDSCH.

In one example, the DCI includes: the referenced HARQ-ACK timing relationship indicates a time unit.

According to another aspect of the embodiments of the present invention, there is provided a method for transmitting hybrid automatic repeat request acknowledgement HARQ-ACK information, including: receiving Downlink Control Information (DCI), wherein the DCI comprises a physical downlink control channel (PUCCH) resource indication; receiving a PDSCH based on the DCI; determining PUCCH resources for transmitting HARQ-ACK information of the PDSCH according to the PUCCH resource indication; and transmitting HARQ-ACK information of the PDSCH on an available PUCCH resource subsequent to the determined PUCCH resource when the determined PUCCH resource is unavailable.

In one example, the available PUCCH resource after the determined PUCCH resource is a first available resource among available PUCCH resources after the determined PUCCH resource.

In one example, a time interval between a first available resource among available PUCCH resources subsequent to the determined PUCCH resource and the determined PUCCH resource does not exceed a preset value.

In one example, transmitting HARQ-ACK information for PDSCH includes one of the following according to a signaling indication or a received signal strength of a user equipment, UE: feeding back NACK on the determined PUCCH resource when the PDSCH is not decoded correctly; feeding back ACK on the determined PUCCH resource when the PDSCH is correctly decoded, and feeding back NACK on the determined PUCCH resource when the PDSCH is not correctly decoded; and neither ACK nor NACK is fed back.

In one example, when the determined PUCCH resource overlaps in time with another PUCCH resource, transmitting HARQ-ACK information of the PDSCH further includes one of: transmitting the multiplexed HARQ-ACK information on the determined PUCCH resources; and transmitting the HARQ-ACK information of the PDSCH according to the priority of the HARQ-ACK information.

In one example, transmitting HARQ-ACK information for PDSCH further includes: determining the transmission power of PUCCH resources according to the power control command in the DCI; and transmitting HARQ-ACK information of the PDSCH on the determined PUCCH resources with the transmission power, wherein the DCI is scrambled based on a Radio Network Temporary Identifier (RNTI).

In one example, the power control command is received in DCI scrambled based on the first RNTI.

In one example, the power control command is received in DCI scrambled based on the second RNTI.

In one example, the payload size of the DCI scrambled based on the second RNTI is equal to the payload size of the DCI scheduling the MBS PDSCH.

In one example, the number of information bits of the DCI scrambled based on the second RNTI is less than or equal to the payload size of the DCI scheduling the MBS PDSCH.

According to another aspect of the embodiments of the present invention, there is provided a method for transmitting an aperiodic channel state information CSI report, including: receiving Downlink Control Information (DCI), wherein the DCI comprises a CSI drive field; and transmitting an aperiodic CSI report for a multicast physical downlink shared channel, PDSCH, based on the CSI driver field.

In one example, transmitting an aperiodic CSI report for a multicast PDSCH based on a CSI driver field includes: determining the type of the aperiodic CSI report according to the value of the CSI drive field; and transmitting the determined type of aperiodic CSI report.

In one example, transmitting the aperiodic CSI report for the multicast PDSCH based on the CSI driver field further comprises: and determining whether to send the aperiodic CSI report according to the higher layer signaling configuration.

In one example, transmitting the aperiodic CSI report for the multicast PDSCH based on the CSI driver field further comprises: determining whether to transmit an aperiodic CSI report according to the measured CSI based on the value of the CSI drive field.

In one example, PUCCH resources for transmitting CQI indications are determined according to CQI indexes measured by the UE, and the PUCCH resources correspond to different ranges of CQI indexes, respectively.

In one example, the CSI driver field is located in at least one of a physical downlink control channel, PDCCH, that schedules the multicast PDSCH and the multicast PDSCH scheduled by the PDCCH.

According to another aspect of the embodiments of the present invention, there is provided a method for receiving hybrid automatic repeat request acknowledgement HARQ-ACK information, including: transmitting Downlink Control Information (DCI), wherein a physical downlink control channel (PUCCH) resource indication is included in the DCI, and the PUCCH resource indication determines PUCCH resources used for transmitting HARQ-ACK information of a PDSCH; transmitting the PDSCH based on the DCI; and receiving HARQ-ACK information of the PDSCH on an available PUCCH resource subsequent to the determined PUCCH resource when the determined PUCCH resource is unavailable.

In one example, the method further comprises sending signaling instructing the user equipment UE to one of: feeding back a NACK on the determined PUCCH resource when the PDSCH is not correctly decoded; feeding back ACK on the determined PUCCH resource when the PDSCH is correctly decoded, and feeding back NACK on the determined PUCCH resource when the PDSCH is not correctly decoded; and neither ACK nor NACK is fed back.

In one example, the DCI includes: a power control command to determine a transmission power of a PUCCH resource, wherein the DCI is scrambled based on a Radio Network Temporary Identifier (RNTI).

In one example, the power control command is transmitted in DCI scrambled based on the first RNTI.

In one example, the power control command is transmitted in DCI scrambled based on the second RNTI.

According to another aspect of the embodiments of the present invention, there is provided a method for receiving aperiodic channel state information CSI report, including: sending Downlink Control Information (DCI), wherein a CSI drive field is included in the DCI; and receiving an aperiodic CSI report for a multicast physical downlink shared channel, PDSCH, sent based on a CSI driver field.

In one example, the CQI indication is received on PUCCH resources determined from CQI indices measured by the UE, and the PUCCH resources correspond to different ranges of CQI indices, respectively.

In one example, the CSI driver field is for at least one UE.

In one example, a CSI driver field located in a multicast PDSCH scheduled by a PDCCH indicates whether at least one UE transmits aperiodic CSI reports.

According to another aspect of the embodiments of the present invention, there is provided an apparatus for transmitting hybrid automatic repeat request acknowledgement HARQ-ACK information, including: a transceiver which transmits and receives a signal; a processor; and a memory having stored therein instructions executable by the processor, the instructions when executed by the processor causing the processor to perform any of the foregoing methods for transmitting.

According to another aspect of the embodiments of the present invention, there is provided an apparatus for receiving hybrid automatic repeat request acknowledgement HARQ-ACK information, including: a transceiver which transmits and receives a signal; a processor; and a memory having stored therein instructions executable by the processor, the instructions when executed by the processor causing the processor to perform any of the foregoing methods for receiving.

Further, in the present application, a method for transmitting HARQ-ACK of PDSCH is described, so that on the premise of saving PDSCH and PDCCH in multicast and unicast technologies, HARQ-ACK feedback information of PDSCH can be accurately transmitted using as few PUCCH resources as possible with reasonable power.

Drawings

The present invention will be more readily understood from the following detailed description taken in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements, and in which:

fig. 1 illustrates an example wireless network in accordance with various embodiments of the present disclosure;

fig. 2a and 2b illustrate example wireless transmit and receive paths according to the present disclosure;

fig. 3a illustrates an example UE according to the present disclosure;

fig. 3b illustrates an example gNB according to the present disclosure;

figure 4 shows an example of HARQ-ACK where a UE transmits a unicast PDSCH;

fig. 5 illustrates an exemplary flowchart of a method for transmitting hybrid automatic repeat request acknowledgement, HARQ-ACK, information according to an embodiment of the present invention;

FIG. 6 shows a schematic diagram of one method of transmitting HARQ-ACK for multicast PDSCH and HARQ-ACK for unicast PDSCH for a UE according to an embodiment of the invention;

fig. 7 illustrates a diagram of a case where HARQ-ACK of PDSCH cannot be transmitted;

fig. 8 is a diagram illustrating another method for transmitting HARQ-ACK for PDSCH according to an embodiment of the present invention;

fig. 9 illustrates an exemplary flowchart of a method for transmitting HARQ-ACK information of a PDSCH according to an embodiment of the present invention;

fig. 10 illustrates an exemplary flowchart of a method for transmitting HARQ-ACK information of a PDSCH according to an embodiment of the present invention;

fig. 11 illustrates an exemplary flowchart of a method for determining HARQ-ACK information for transmitting a PDSCH according to an embodiment of the present invention;

fig. 12 and 13 illustrate diagrams of determining the position of the HARQ-ACK timing relationship reference point k1 ═ 0 according to an embodiment of the present invention;

fig. 14 and 15 illustrate diagrams for determining a transmission time unit of a PUCCH according to an embodiment of the present invention;

fig. 16 illustrates an exemplary flow chart of a method for receiving hybrid automatic repeat request acknowledgement, HARQ-ACK, information according to an embodiment of the invention;

fig. 17 illustrates an exemplary flowchart of a method for transmitting HARQ-ACK for PDSCH according to an embodiment of the present invention;

fig. 18 illustrates an exemplary flowchart of a method of transmitting aperiodic channel state information CSI report according to an embodiment of the present invention;

fig. 19 illustrates an exemplary flow diagram of a method for receiving hybrid automatic repeat request acknowledgement, HARQ-ACK, information in accordance with an embodiment of the invention;

fig. 20 shows an exemplary flowchart of a method for receiving hybrid automatic repeat request acknowledgement, HARQ-ACK, information according to an embodiment of the invention;

FIG. 21 shows a schematic block diagram of an apparatus for transmitting according to an embodiment of the present invention;

fig. 22 shows a schematic block diagram of an apparatus for receiving according to an embodiment of the present invention; and

fig. 23 and 24 illustrate diagrams for determining a maximum delay time according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples.

Fig. 1 illustrates an example wireless network 100 in accordance with various embodiments of the present disclosure. The embodiment of the wireless network 100 shown in fig. 1 is for illustration only. Other embodiments of wireless network 100 can be used without departing from the scope of this disclosure.

Wireless network 100 includes a gandeb (gNB)101, a gNB 102, and a gNB 103. gNB 101 communicates with gNB 102 and gNB 103. The gNB 101 also communicates with at least one Internet Protocol (IP) network 130, such as the internet, a proprietary IP network, or other data network.

Depending on the network type, other well-known terms can be used instead of "gnnodeb" or "gNB", such as "base station" or "access point". For convenience, the terms "gNodeB" and "gNB" are used in this patent document to refer to network infrastructure components that provide wireless access for remote terminals. Also, other well-known terms, such as "mobile station", "subscriber station", "remote terminal", "wireless terminal", or "user equipment", can be used instead of "user equipment" or "UE", depending on the network type. For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to a remote wireless device that wirelessly accesses the gNB, whether the UE is a mobile device (such as a mobile phone or smartphone) or what is commonly considered a stationary device (such as a desktop computer or vending machine).

gNB 102 provides wireless broadband access to network 130 for a first plurality of User Equipments (UEs) within coverage area 120 of gNB 102. The first plurality of UEs includes: a UE 111, which may be located in a Small Enterprise (SB); a UE 112, which may be located in an enterprise (E); UE 113, which may be located in a WiFi Hotspot (HS); a UE 114, which may be located in a first residence (R); a UE 115, which may be located in a second residence (R); the UE 116, may be a mobile device (M) such as a cellular phone, wireless laptop, wireless PDA, etc. gNB 103 provides wireless broadband access to network 130 for a second plurality of UEs within coverage area 125 of gNB 103. The second plurality of UEs includes UE 115 and UE 116. In some embodiments, one or more of the gnbs 101-103 are capable of communicating with each other and with the UEs 111-116 using 5G, Long Term Evolution (LTE), LTE-A, WiMAX, or other advanced wireless communication technologies.

The dashed lines illustrate the approximate extent of coverage areas 120 and 125, which are shown as approximately circular for purposes of illustration and explanation only. It should be clearly understood that the coverage areas associated with the gnbs, such as coverage areas 120 and 125, can have other shapes, including irregular shapes, depending on the configuration of the gnbs and variations in the radio environment associated with natural and artificial obstructions.

As described in more detail below, one or more of gNB 101, gNB 102, and gNB 103 include a 2D antenna array as described in embodiments of the present disclosure. In some embodiments, one or more of gNB 101, gNB 102, and gNB 103 support codebook design and structure for systems with 2D antenna arrays.

Although fig. 1 shows one example of a wireless network 100, various changes can be made to fig. 1. For example, wireless network 100 can include any number of gnbs and any number of UEs in any suitable arrangement. Also, the gNB 101 can communicate directly with any number of UEs and provide those UEs with wireless broadband access to the network 130. Similarly, each gNB 102-103 can communicate directly with network 130 and provide UEs direct wireless broadband access to network 130. Further, the

gnbs

101, 102, and/or 103 can provide access to other or additional external networks, such as external telephone networks or other types of data networks.

Fig. 2a and 2b illustrate example wireless transmit and receive paths according to the present disclosure. In the following description, transmit path 200 can be described as being implemented in a gNB (such as gNB 102), while receive path 250 can be described as being implemented in a UE (such as UE 116). However, it should be understood that the receive path 250 can be implemented in the gNB and the transmit path 200 can be implemented in the UE. In some embodiments, receive path 250 is configured to support codebook design and structure for systems with 2D antenna arrays as described in embodiments of the present disclosure.

The transmit path 200 includes a channel coding and modulation block 205, a serial-to-parallel (S-to-P) block 210, an N-point Inverse Fast Fourier Transform (IFFT) block 215, a parallel-to-serial (P-to-S) block 220, an add cyclic prefix block 225, and an up-converter (UC) 230. Receive path 250 includes a down-converter (DC)255, a remove cyclic prefix block 260, a serial-to-parallel (S-to-P) block 265, an N-point Fast Fourier Transform (FFT) block 270, a parallel-to-serial (P-to-S) block 275, and a channel decode and demodulation block 280.

In transmit path 200, a channel coding and modulation block 205 receives a set of information bits, applies coding, such as Low Density Parity Check (LDPC) coding, and modulates the input bits, such as with Quadrature Phase Shift Keying (QPSK) or Quadrature Amplitude Modulation (QAM), to generate a sequence of frequency domain modulation symbols. A serial-to-parallel (S-to-P) block 210 converts (such as demultiplexes) the serial modulation symbols into parallel data in order to generate N parallel symbol streams, where N is the number of IFFT/FFT points used in the gNB 102 and the UE 116. N-point IFFT block 215 performs IFFT operations on the N parallel symbol streams to generate a time-domain output signal. Parallel-to-serial block 220 converts (such as multiplexes) the parallel time-domain output symbols from N-point IFFT block 215 to generate a serial time-domain signal. Add cyclic prefix block 225 inserts a cyclic prefix into the time domain signal. Upconverter 230 modulates (such as upconverts) the output of add cyclic prefix block 225 to an RF frequency for transmission over a wireless channel. The signal can also be filtered at baseband before being converted to RF frequency.

The RF signal transmitted from the gNB 102 reaches the UE 116 after passing through the radio channel, and the reverse operation to that at the gNB 102 is performed at the UE 116. Downconverter 255 downconverts the received signal to baseband frequency and remove cyclic prefix block 260 removes the cyclic prefix to generate a serial time-domain baseband signal. Serial-to-parallel block 265 converts the time-domain baseband signal to parallel time-domain signals. The N-point FFT block 270 performs an FFT algorithm to generate N parallel frequency domain signals. The parallel-to-serial block 275 converts the parallel frequency domain signals to a sequence of modulated data symbols. Channel decode and demodulation block 280 demodulates and decodes the modulated symbols to recover the original input data stream.

Each of the gnbs 101-103 may implement a transmission path 200 similar to the transmission to the UE 111-116 in the downlink and may implement a reception path 250 similar to the reception from the UE 111-116 in the uplink. Similarly, each of UEs 111-116 may implement a transmit path 200 for transmitting in the uplink to gNB 101-103 and may implement a receive path 250 for receiving in the downlink from gNB 101-103.

Each of the components in fig. 2a and 2b can be implemented using hardware only, or using a combination of hardware and software/firmware. As a specific example, at least some of the components in fig. 2a and 2b may be implemented in software, while other components may be implemented in configurable hardware or a mixture of software and configurable hardware. For example, FFT block 270 and IFFT block 215 may be implemented as configurable software algorithms, where the value of the number of points N may be modified depending on the implementation.

Further, although described as using an FFT and IFFT, this is merely illustrative and should not be construed as limiting the scope of the disclosure. Other types of transforms can be used, such as Discrete Fourier Transform (DFT) and Inverse Discrete Fourier Transform (IDFT) functions. It should be understood that the value of the variable N may be any integer (such as 1, 2, 3, 4, etc.) for DFT and IDFT functions, and any integer that is a power of 2 (such as 1, 2, 4, 8, 16, etc.) for FFT and IFFT functions.

Although fig. 2a and 2b show examples of wireless transmission and reception paths, various changes may be made to fig. 2a and 2 b. For example, the various components in fig. 2a and 2b can be combined, further subdivided, or omitted, and additional components can be added according to particular needs. Also, fig. 2a and 2b are intended to illustrate examples of the types of transmit and receive paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communications in a wireless network.

Fig. 3a illustrates an example UE 116 according to the present disclosure. The embodiment of the UE 116 shown in fig. 3a is for illustration only, and the

UE

111 and 115 of fig. 1 can have the same or similar configuration. However, UEs have a wide variety of configurations, and fig. 3a does not limit the scope of the present disclosure to any particular implementation of a UE.

The UE 116 includes an antenna 305, a Radio Frequency (RF) transceiver 310, Transmit (TX) processing circuitry 315, a microphone 320, and Receive (RX) processing circuitry 325. The UE 116 also includes a speaker 330, a processor/controller 340, an input/output (I/O) interface 345, input device(s) 350, a display 355, and a memory 360. Memory 360 includes an Operating System (OS)361 and one or more applications 362.

RF transceiver 310 receives incoming RF signals from antenna 305 that are transmitted by the gNB of wireless network 100. The RF transceiver 310 down-converts an incoming RF signal to generate an Intermediate Frequency (IF) or baseband signal. The IF or baseband signal is sent to RX processing circuitry 325, where RX processing circuitry 325 generates a processed baseband signal by filtering, decoding, and/or digitizing the baseband or IF signal. RX processing circuit 325 sends the processed baseband signals to speaker 330 (such as for voice data) or to processor/controller 340 (such as for web browsing data) for further processing.

TX processing circuitry 315 receives analog or digital voice data from microphone 320 or other outgoing baseband data (such as network data, e-mail, or interactive video game data) from processor/controller 340. TX processing circuitry 315 encodes, multiplexes, and/or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceiver 310 receives the outgoing processed baseband or IF signal from TX processing circuitry 315 and upconverts the baseband or IF signal to an RF signal, which is transmitted via antenna 305.

The processor/controller 340 can include one or more processors or other processing devices, and executes the OS 361 stored in the memory 360 in order to control overall operation of the UE 116. For example, processor/controller 340 may be capable of controlling the reception of forward channel signals and the transmission of reverse channel signals by RF transceiver 310, RX processing circuitry 325, and TX processing circuitry 315 in accordance with well-known principles. In some embodiments, processor/controller 340 includes at least one microprocessor or microcontroller.

The processor/controller 340 can also execute other processes and programs resident in the memory 360, such as operations for channel quality measurement and reporting for systems having 2D antenna arrays as described in embodiments of the present disclosure. Processor/controller 340 is capable of moving data into and out of memory 360 as needed to perform a process. In some embodiments, processor/controller 340 is configured to execute applications 362 based on OS 361 or in response to signals received from the gNB or the operator. The processor/controller 340 is also coupled to an I/O interface 345, where the I/O interface 345 provides the UE 116 with the ability to connect to other devices, such as laptop computers and handheld computers. I/O interface 345 is the communication path between these accessories and processor/controller 340.

The processor/controller 340 is also coupled to input device(s) 350 and a display 355. The operator of the UE 116 can input data into the UE 116 using the input device(s) 350. Display 355 may be a liquid crystal display or other display capable of presenting text and/or at least limited graphics (such as from a website). A memory 360 is coupled to the processor/controller 340. A portion of memory 360 can include Random Access Memory (RAM) while another portion of memory 360 can include flash memory or other Read Only Memory (ROM).

Although fig. 3a shows one example of the UE 116, various changes can be made to fig. 3 a. For example, the various components in FIG. 3a can be combined, further subdivided, or omitted, and additional components can be added according to particular needs. As a particular example, the processor/controller 340 can be divided into multiple processors, such as one or more Central Processing Units (CPUs) and one or more Graphics Processing Units (GPUs). Also, while fig. 3a shows the UE 116 configured as a mobile phone or smart phone, the UE can be configured to operate as other types of mobile or fixed devices.

Fig. 3b illustrates an example gNB 102 according to the present disclosure. The embodiment of the gNB 102 shown in fig. 3b is for illustration only, and the other gnbs of fig. 1 can have the same or similar configuration. However, the gNB has a wide variety of configurations, and fig. 3b does not limit the scope of the present disclosure to any particular implementation of the gNB. Note that gNB 101 and gNB 103 can include the same or similar structure as gNB 102.

As shown in fig. 3b, the gNB 102 includes multiple antennas 370a-370n, multiple RF transceivers 372a-372n, Transmit (TX) processing circuitry 374, and Receive (RX) processing circuitry 376. In some embodiments, one or more of the plurality of antennas 370a-370n comprises a 2D antenna array. The gNB 102 also includes a controller/processor 378, a memory 380, and a backhaul or network interface 382.

The RF transceivers 372a-372n receive incoming RF signals, such as signals transmitted by UEs or other gnbs, from the antennas 370a-370 n. RF transceivers 372a-372n down-convert the incoming RF signals to generate IF or baseband signals. The IF or baseband signal is sent to RX processing circuitry 376, where RX processing circuitry 376 generates a processed baseband signal by filtering, decoding, and/or digitizing the baseband or IF signal. The RX processing circuit 376 sends the processed baseband signals to the controller/processor 378 for further processing.

TX processing circuitry 374 receives analog or digital data (such as voice data, network data, e-mail, or interactive video game data) from controller/processor 378. TX processing circuitry 374 encodes, multiplexes, and/or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceivers 372a-372n receive outgoing processed baseband or IF signals from TX processing circuitry 374 and upconvert the baseband or IF signals into RF signals for transmission via antennas 370a-370 n.

Controller/processor 378 can include one or more processors or other processing devices that control the overall operation of gNB 102. For example, the controller/processor 378 can control the reception of forward channel signals and the transmission of reverse channel signals through the RF transceivers 372a-372n, RX processing circuitry 376, and TX processing circuitry 374 according to well-known principles. The controller/processor 378 can also support additional functions, such as higher-level wireless communication functions. For example, the controller/processor 378 can perform a Blind Interference Sensing (BIS) process, such as by performing a BIS algorithm, and decode the received signal with the interference signal subtracted. Controller/processor 378 may support any of a wide variety of other functions in the gNB 102. In some embodiments, controller/processor 378 includes at least one microprocessor or microcontroller.

Controller/processor 378 is also capable of executing programs and other processes resident in memory 380, such as a base OS. The controller/processor 378 can also support channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the present disclosure. In some embodiments, controller/processor 378 supports communication between entities such as a web RTC. Controller/processor 378 can move data into and out of memory 380 as needed to perform a process.

Controller/processor 378 is also coupled to a backhaul or network interface 382. Backhaul or network interface 382 allows gNB 102 to communicate with other devices or systems over a backhaul connection or over a network. Backhaul or network interface 382 can support communication via any suitable wired or wireless connection(s). For example, when the gNB 102 is implemented as part of a cellular communication system (such as one supporting 5G or new radio access technologies or NR, LTE or LTE-a), the backhaul or network interface 382 can allow the gNB 102 to communicate with other gnbs over wired or wireless backhaul connections. When gNB 102 is implemented as an access point, backhaul or network interface 382 can allow gNB 102 to communicate with a larger network (such as the internet) through a wired or wireless local area network or through a wired or wireless connection. Backhaul or network interface 382 includes any suitable structure that supports communication over a wired or wireless connection, such as an ethernet or RF transceiver.

A memory 380 is coupled to the controller/processor 378. A portion of memory 380 can include RAM and another portion of memory 380 can include flash memory or other ROM. In certain embodiments, a plurality of instructions, such as a BIS algorithm, is stored in memory. The plurality of instructions are configured to cause the controller/processor 378 to perform a BIS process and decode the received signal after subtracting at least one interfering signal determined by a BIS algorithm.

As described in more detail below, the transmit and receive paths of gNB 102 (implemented using RF transceivers 372a-372n, TX processing circuitry 374, and/or RX processing circuitry 376) support aggregated communication with FDD and TDD cells.

Although fig. 3b shows one example of a gNB 102, various changes may be made to fig. 3 b. For example, the gNB 102 can include any number of each of the components shown in fig. 3 a. As a particular example, the access point can include a number of backhauls or network interfaces 382 and the controller/processor 378 can support routing functions to route data between different network addresses. As another particular example, although shown as including a single instance of TX processing circuitry 374 and a single instance of RX processing circuitry 376, gNB 102 can include multiple instances of each (such as one for each RF transceiver).

Transmissions from a base station to a User Equipment (UE) are referred to as downlink and transmissions from the UE to the base station are referred to as uplink. HARQ-ACK Information of a Physical Downlink Shared Channel (PDSCH) may be transmitted on a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH), and the PDSCH is scheduled by Downlink Control Information (DCI) transmitted on a Physical Downlink Control Channel (PDCCH).

A Unicast (Unicast) PDSCH is a PDSCH received by a UE, and optionally scrambling of the PDSCH is based on a Radio Network Temporary Identifier (RNTI) specific to the UE, such as a C-RNTI; multicast (groupcast or multicast)/broadcast is one PDSCH that is received by more than one UE at the same time.

There is a need for a scheme for transmitting HARQ-ACK for PDSCH.

Exemplary embodiments of the present disclosure are further described below in conjunction with the appended drawings.

The text and drawings are provided as examples only to assist the reader in understanding the disclosure. They are not intended, nor should they be construed, as limiting the scope of the disclosure in any way. While certain embodiments and examples have been provided, it will be apparent to those skilled in the art, based on the disclosure herein, that changes can be made in the embodiments and examples shown without departing from the scope of the disclosure.

Fig. 4 shows an example of HARQ-ACK in which a UE transmits a unicast PDSCH.

For the case of uplink Carrier Aggregation (CA), the UE transmits HARQ-ACK of unicast PDSCH in PUCCH or PUSCH in the uplink serving Cell.

Alternatively, for the case with a supplemental Uplink carrier (SUL), the UE transmits HARQ-ACK for unicast PDSCH on PUCCH or PUSCH of the Uplink carrier.

At present, a transmission method of HARQ-ACK for multicast PDSCH under CA and SUL is also needed.

The transmission method of HARQ-ACK for multicast PDSCH will be described below by taking the case of uplink CA as an example, but it will be understood by those skilled in the art that these methods can also be applied to the case of SUL.

First embodiment

Fig. 5 illustrates an exemplary flow diagram of a method 500 for transmitting hybrid automatic repeat request acknowledgement, HARQ-ACK, information in accordance with an embodiment of the invention. The method 500 is implemented at the UE side.

As shown in fig. 5, in step S510 of the method 500, downlink control information DCI is received.

In step S520, the PDSCH is received based on the DCI.

In step S530, HARQ-ACK information of the PDSCH is transmitted on the uplink serving cell or uplink carrier.

Therefore, according to the embodiment of the present invention, a serving cell or carrier for HARQ-ACK transmission of the PDSCH may be determined and HARQ-ACK information of the PDSCH may be transmitted on the determined serving cell or carrier.

Here, the PDSCH may be a multicast PDSCH or a unicast PDSCH. According to the embodiment of the present invention, an uplink serving cell, which may also be an uplink bandwidth part (UL BWP), or an uplink carrier, which transmits HARQ-ACK information of a multicast PDSCH, may be determined according to the indication.

The indication may be a display information indication or an implicit information indication.

Two ways for determining the uplink serving cell or uplink carrier for transmitting HARQ-ACK information for a multicast PDSCH will be described hereinafter.

Mode 1.1

In mode 1.1, the uplink serving cell or uplink carrier is an uplink serving cell or uplink carrier for transmitting PUCCH.

According to an embodiment of the present invention, the uplink serving cell or uplink carrier used for transmitting the HARQ-ACK information of the multicast PDSCH is the uplink serving cell or uplink carrier used for transmitting the HARQ-ACK information of the unicast PDSCH.

In the above case, for a UE that receives the multicast PDSCH and the unicast PDSCH simultaneously, in case of uplink CA, HARQ-ACK for the multicast PDSCH and HARQ-ACK for the unicast PDSCH may be transmitted in the same uplink serving cell, that is, the UE transmits HARQ-ACK for the multicast PDSCH in the uplink serving cell that transmits HARQ-ACK for the unicast PDSCH (HARQ-ACK information for PDSCH).

FIG. 6 shows a diagram of one method of transmitting HARQ-ACK for multicast PDSCH and HARQ-ACK for unicast PDSCH for a UE according to an embodiment of the invention.

In case of CA, HARQ-ACK of the multicast PDSCH is transmitted in the serving cell transmitting PUCCH, and the serving cell transmitting HARQ-ACK of the multicast PDSCH may be PCell or Scell transmitting PUCCH.

As shown in fig. 6, in case of uplink CA, HARQ-ACK of unicast PDSCH of UE is transmitted on PUCCH of uplink serving cell 1, and if uplink serving cell 1 is a primary cell (Pcell) of UE or a cell configured to transmit PUCCH, HARQ-ACK of multicast PDSCH of UE is also transmitted on PUCCH of uplink serving cell 1.

The method has the advantages that the HARQ-ACK of the multicast PDSCH and the HARQ-ACK of the unicast PDSCH are transmitted in one uplink service cell, only one set of PUCCH power control parameters can be used, the HARQ-ACK of the multicast PDSCH and the HARQ-ACK of the unicast PDSCH can be multiplexed in one PUCCH, and the transmission performance of the HARQ-ACK of the multicast PDSCH can be better ensured.

Here, the PUSCH may be used instead of the PUCCH of the same serving cell, i.e., the HARQ-ACK for multicast PDSCH and the HARQ-ACK for unicast PDSCH may be transmitted on the PUSCH.

In case of SUL, HARQ-ACK of the multicast PDSCH is transmitted on a carrier transmitting PUCCH, and the carrier transmitting HARQ-ACK of the multicast PDSCH may be a SUL carrier or a non-SUL carrier.

In the case of SUL, the HARQ-ACK of the multicast PDSCH and the HARQ-ACK of the unicast PDSCH may be transmitted on the same carrier, i.e., the UE transmits the HARQ-ACK of the multicast PDSCH on the uplink carrier on which the HARQ-ACK of the unicast PDSCH is transmitted.

The method has the advantages that the HARQ-ACK of the multicast PDSCH and the HARQ-ACK of the unicast PDSCH are transmitted in one uplink carrier, only one set of power control parameters can be provided, and the HARQ-ACK of the multicast PDSCH and the HARQ-ACK of the unicast PDSCH can be multiplexed in one PUCCH or PUSCH.

According to the embodiment of the invention, because the serving cell for transmitting the HARQ-ACK of the unicast PDSCH by different UEs may not be the same uplink serving cell, and the same UE can transmit the HARQ-ACK of the multicast PDSCH and the HARQ-ACK of the unicast PDSCH in the same uplink serving cell, the serving cell for transmitting the PUCCH of the HARQ-ACK of the multicast PDSCH by different UEs may not be the same serving cell. For example, UE-1 receives HARQ-ACK for unicast PDSCH transmitted on uplink serving cell 1 and UE-1 receives HARQ-ACK for multicast PDSCH also transmitted on uplink serving cell 1, while UE-2 receives HARQ-ACK for unicast PDSCH transmitted on uplink serving cell 2 and UE-2 receives HARQ-ACK for multicast PDSCH also transmitted on uplink serving cell 2.

In this way, different UEs may receive the same multicast PDSCH, but different UEs may transmit HARQ-ACKs for the multicast PDSCH on different uplink serving cells.

By adopting the method, because different UEs have different distances from the base station, the UE far away from the base station needs to feed back HARQ-ACK on a low-frequency serving cell, the UE near to the base station can feed back the HARQ-ACK on a high-frequency serving cell, and the transmission of the HARQ-ACK by different UEs on different uplink serving cells can better ensure the uplink coverage of different UEs, thereby ensuring the transmission performance of the HARQ-ACK of the multicast PDSCH.

Similarly, in case of SUL, since different UEs may not transmit HARQ-ACK of unicast PDSCH on one same carrier, for example, UE-1 transmits HARQ-ACK on Uplink primary cell, UE-2 transmits HARQ-ACK on supplementary cell (SUL), and the same UE transmits HARQ-ACK of multicast PDSCH and HARQ-ACK of unicast PDSCH on the same Uplink carrier, according to the embodiment of the present invention, PUCCH for HARQ-ACK of multicast PDSCH transmitted by different UEs may not be one same carrier. For example, UE-1 receives HARQ-ACK transmission for multicast PDSCH on uplink carrier 1 and UE-2 receives HARQ-ACK transmission for multicast PDSCH on uplink carrier 2.

By adopting the method, because different UEs are different in distance from the base station, the UE far away from the base station needs to feed back HARQ-ACK on a low-frequency carrier, the UE near to the base station can feed back the HARQ-ACK on a high-frequency carrier, and the transmission of the HARQ-ACK on different uplink carriers by different UEs can better ensure the uplink coverage of different UEs, thereby ensuring the transmission performance of the HARQ-ACK of the multicast PDSCH.

Mode 1.2

Fig. 7 shows a diagram of a case where HARQ-ACK of PDSCH cannot be transmitted.

As shown in fig. 7, if HARQ-ACKs of multicast PDSCH of different UEs are transmitted in different serving cells, since when uplink/downlink configurations of different serving cells are different, it is difficult for the base station to make the indicated PUCCH for transmitting multicast HARQ-ACK all located in uplink OFDM symbol, so that there is a possibility that the indicated PUCCH resource of UE is in uplink OFDM symbol, and the same OFDM symbol is downlink OFDM symbol for some UEs, resulting in that HARQ-ACK of multicast PDSCH of these UEs cannot be transmitted in the indicated PUCCH resource.

Embodiments of the present invention may solve the above problems. In the method 1.2, the uplink serving cell or uplink carrier for transmitting the HARQ-ACK information of the PDSCH is the configured uplink serving cell or uplink carrier.

Fig. 8 illustrates a diagram of another method for transmitting HARQ-ACK of PDSCH according to an embodiment of the present invention.

For a UE receiving PDSCH, in case of uplink CA, HARQ-ACK of PDSCH of the UE is transmitted in the configured uplink serving cell.

According to the embodiments of the present invention, an uplink serving cell or uplink carrier for HARQ-ACK transmission of PDSCH can be determined according to an explicit indication or an implicit indication.

For example, as an example of displaying an indication, the UE may determine an uplink serving cell or uplink carrier on which to transmit HARQ-ACK for PDSCH by receiving independent signaling (including a higher layer signaling configuration, a medium access layer signaling indication, and a physical layer signaling indication, which refers to an information indication in DCI), e.g., the UE determines HARQ-ACK for PDSCH by transmitting on the uplink serving cell by receiving a higher layer signaling configuration.

Alternatively, as an example of an implicit indication, the UE may determine the uplink serving cell or uplink carrier on which to transmit the HARQ-ACK for the PDSCH through implicit signaling. For example, the uplink serving cell for HARQ-ACK transmission of PDSCH may be an uplink serving cell corresponding to the downlink serving cell transmitting PDSCH.

For example, in the case where the PDSCH is transmitted in a Time Division Multiplexing (TDD) cell, the uplink serving cell for transmitting HARQ-ACK of the PDSCH and the downlink serving cell for transmitting the PDSCH are the same carrier, and the Time Division Multiplexing may also be referred to as an Unpaired Spectrum (unaided Spectrum); in the case of Frequency Division Multiplexing (FDD) cells, an uplink serving cell for transmitting HARQ-ACK of PDSCH and a downlink serving cell for transmitting PDSCH are a pair of carriers, and Frequency Division Multiplexing may also be referred to as Paired Spectrum (Paired Spectrum).

The method has the advantage that the HARQ-ACK timing relation indication method of the PDSCH is simple. In addition, the base station does not have the PUCCH for transmission of HARQ-ACK indicated by the timing relationship located within the downlink OFDM symbol, as shown in fig. 8.

In addition, the UE may determine the uplink serving cell or uplink carrier for transmitting HARQ-ACK information for the multicast PDSCH by receiving signaling (including higher layer signaling configuration, medium access layer signaling indication, and physical layer signaling indication, which refers to information indication in DCI) in one of the above two ways, i.e., way 1.1 and way 1.2.

Second embodiment

The unicast PDSCH transmission HARQ-ACK timing relation refers to the time slot length corresponding to SCS configuration of the PUCCH. However, in the case of the multicast PDSCH, when the serving cell of the PUCCH for transmitting HARQ-ACK of the multicast PDSCH by the UE is a different serving cell, the subcarrier Spacing (SCS) configuration of the uplink serving cell for transmitting HARQ-ACK by the different UE may or may not be the same. When the SCS configurations of uplink serving cells for different UEs to transmit HARQ-ACKs are different, the slot lengths are also different. Table 1 exemplarily shows a correspondence relationship between SCS configuration and slot length.

Therefore, according to the embodiment of the present invention, when transmitting HARQ-ACK of PDSCH, for example, in step S540, HARQ-ACK timing relationship of PDSCH is also determined, where HARQ-ACK timing relationship refers to time correspondence between PDSCH and PUCCH transmitting HARQ-ACK information of PDSCH, and the correspondence is called PDSCH-to-HARQ _ feedback timing (PDSCH-to-HARQ _ feedback timing). For example, the PDSCH is transmitted in time unit n, the PUCCH that transmits the HARQ-ACK of the PDSCH is transmitted in time unit n + k1, and k1 is referred to as the timing relationship of the HARQ-ACK of the PDSCH.

At this Time, a HARQ-ACK timing relation indication Time Unit (Time Unit) needs to be configured to indicate the HARQ-ACK timing relation k1 of the UE receiving the PDSCH.

Table 1: subcarrier spatial configuration (mu) and number of slots per subframe

Hereinafter, determination of the HARQ-ACK timing relationship will be described in detail with reference to the drawings.

Method 2.1

Fig. 9 illustrates an exemplary flow diagram of a method 900 for transmitting HARQ-ACK information for a PDSCH according to an embodiment of the present invention. The method 900 is implemented at the UE side. The method 900 may be included in step S540 of fig. 5.

As shown in fig. 9, in step S910 of method 900, the HARQ-ACK timing relationship for PDSCH is determined.

In step S920, a transmission time unit of the PUCCH is determined based on a HARQ-ACK timing relationship indication time unit and the HARQ-ACK timing relationship.

In step S930, HARQ-ACK information is transmitted in a transmission time unit of the PUCCH.

In step S910, the UE may determine the HARQ-ACK timing relationship indication time unit of the UE through explicit signaling or implicit signaling, for example, as an example of explicit signaling, the UE may determine the HARQ-ACK timing relationship indication time unit through receiving a higher layer signaling configuration, and as an example of implicit signaling, the UE may also use the slot length of the PUCCH transmitting HARQ-ACK as the HARQ-ACK timing relationship indication time unit.

Then, in step S920, the HARQ-ACK timing relation value, i.e., the k1 value, may be indicated by the timing relation indication field in the DCI scheduling the PDSCH.

And the HARQ-ACK timing relation indication time units of the UE which transmits the HARQ-ACK by different serving cells are configured in the subcarrier space are different.

Then, in step S930, the time unit of the PUCCH transmitting the HARQ-ACK may be determined based on the HARQ-ACK timing relationship indication time unit and the k1 value. For example, in case of implicit signaling, the slot length of PUCCH for UE transmission of HARQ-ACK is 1 ms, i.e. HARQ-ACK timing relation indication time unit is 1 ms, and if k1 indicated by timing relation indication field in DCI is 2, the UE transmits PUCCH for HARQ-ACK in n +2 ms. For another example, the slot length of the PUCCH for transmitting HARQ-ACK by the UE is 0.5 ms, i.e. the HARQ-ACK timing relation indication time unit is 0.5 ms, if k1 indicated by the timing relation indication field in the DCI is 2, then UE-1 transmits the PUCCH for HARQ-ACK in n +2 x 0.5 ms.

With this approach, no additional processing scheme is required for the time unit indicated by the HARQ-ACK timing relationship to be different from the time unit of the PUCCH transmitting the HARQ-ACK.

Further, for a UE receiving PDSCH, a set of k1, i.e., a set of HARQ-ACK timing relationships, may be determined for the UE. For example, through independent higher layer signaling configuration.

Further, in step S910, the HARQ-ACK timing relationship may be determined based on the timing relationship indication field in the DCI, the set of HARQ-ACK timing relationships.

For example, the UE uses the slot length with SCS configuration (μ) of 0 as the HARQ-ACK timing relationship indication time unit, and the set of k1 is { a1, a2, a3, a4}, or the UE uses the slot length with SCS configuration (μ) of 1 as the HARQ-ACK timing relationship indication time unit, and the set of k1 is { b1, b2, b3, b4 }. Or, the UE indicates a time unit for the HARQ-ACK timing relationship with the slot length of 0 in the SCS configuration (μ), and k1 is { c1, c2, c3, c4}, where a1, a2, a3, a4, b1, b2, b3, b4, c1, c2, c3, and c4 are non-negative integers and may be determined by high-layer signaling configuration.

In this case, according to the embodiment of the present invention, in step S920, a HARQ-ACK timing relationship indication may be received for determining the HARQ-ACK timing relationship of the UE from the set of HARQ-ACK timing relationships of the UE, i.e. the set of k 1.

Here, the set of HARQ-ACK timing relationships may be a set corresponding to a multicast PDSCH.

Table 2 exemplarily shows one k1 field indication value in DCI scheduling a multicast PDSCH, and the same k1 value may indicate different and/or the same HARQ-ACK timing relationship for different UEs receiving the multicast PDSCH. The example of table 2 shows that when different UEs or UE groups use different HARQ-ACK timing relation indication time units and/or the same HARQ-ACK timing relation indication time unit, the k1 field indicates a value and a HARQ-ACK timing relation k1 value for each UE, where UE-1 uses a slot length with SCS configuration (μ) of 0 as the HARQ-ACK timing relation indication time unit, and UE-2 and UE-3 use a slot length with SCS configuration (μ) of 1 as the HARQ-ACK timing relation indication time unit, where the specific values in table 2 are only examples, and the embodiments of the present invention are not limited thereto.

Table 2: correspondence table of indicated value of k1 field and timing relation of different UE

The method has the advantages that the flexibility of the HARQ-ACK timing relation is guaranteed, the UE which adopts PUCCHs with different subcarrier space configurations to transmit the HARQ-ACK can be guaranteed to obtain approximate time delay requirements, in addition, the HARQ-ACK of different UEs can be dispersed in different time units by configuring different k1 sets for different UEs, in addition, the PUCCH resources indicated by the indicated value of one k1 field are available for all the UEs by reasonably determining the k1 sets of different UEs.

In addition, for a UE receiving a multicast PDSCH and simultaneously receiving a unicast PDSCH, the HARQ-ACK timing relationship indication time unit for the multicast PDSCH may adopt the HARQ-ACK timing relationship indication time unit for the unicast PDSCH, and the k1 set for HARQ-ACK for the multicast PDSCH and the k1 set for HARQ-ACK for the unicast PDSCH may be determined by independent configuration. For example, for the UE, the set of k1 for HARQ-ACK for multicast PDSCH is { a1, a2, a3, a4}, and the set of k1 for HARQ-ACK for unicast PDSCH is { d1, d2, d3, d4}, d1, d2, d3, d4 are non-negative integers, which may be determined by higher layer signaling configuration.

Furthermore, the k1 set of HARQ-ACKs for multicast PDSCH may also be the k1 set of HARQ-ACKs for unicast PDSCH.

The advantage of using this method is that less timing relation indication fields are used and the flexibility of the HARQ-ACK timing relation is guaranteed.

Method 2.2

Fig. 10 shows an exemplary flowchart of a method 1000 for transmitting HARQ-ACK information for a PDSCH according to an embodiment of the present invention. The method 1000 is implemented at the UE side. The method 1000 may be included in step S540 of fig. 5.

As shown in fig. 10, in step S1010 of method 1000, a HARQ-ACK timing relationship indication time unit is determined.

In one example, the HARQ-ACK timing relationship indicates that the time unit may correspond to a PUCCH subcarrier width/space.

In step S1020, the HARQ-ACK timing relationship for the PDSCH is determined.

In step S1030, a transmission time unit of the PUCCH is determined based on the HARQ-ACK timing relationship indication time unit and HARQ-ACK timing relationship.

Determining the HARQ-ACK timing relationship indication time unit in step S1010 is similar to determining the HARQ-ACK timing relationship indication time unit in step S910, except that the determined HARQ-ACK timing relationship indication time unit corresponds to an uplink serving cell or an uplink carrier of a physical uplink control channel PUCCH transmitting HARQ-ACK information for a PDSCH or the determined HARQ-ACK timing relationship indication time unit corresponds to a subcarrier space SCS of the PUCCH transmitting HARQ-ACK information for the PDSCH in step S1010.

Therefore, according to the embodiments of the present invention, the same HARQ-ACK timing relationship indication time unit may be determined for at least one UE in the same uplink serving cell or the same uplink carrier for a physical uplink control channel PUCCH transmitting HARQ-ACK information of a multicast PDSCH, or the same HARQ-ACK timing relationship indication time unit may be determined for at least one UE in the same subcarrier space SCS for a PUCCH transmitting HARQ-ACK information of a multicast PDSCH.

For example, the slot length of the PUCCH transmitting HARQ-ACK may be taken as the HARQ-ACK timing relationship indication time unit.

Or, when the UE may transmit HARQ-ACK information in multiple serving cells or bandwidth portions, the slot length of the subcarrier Spatial Configuration (SCS) of the primary cell (Pcell) may be used as the HARQ-ACK timing relationship indication time unit, i.e., the HARQ-ACK timing relationship indication time unit referring to the slot length of the subcarrier Spatial Configuration (SCS) of the primary cell (Pcell), so as to ensure that the HARQ-ACK timing relationship indication time unit is not confused by the base station and the UE during reconfiguration.

Or, when the UE may transmit HARQ-ACK information in multiple serving cells or PUCCH of bandwidth part, the longest slot length among slot lengths of PUCCH subcarrier Spatial Configuration (SCS) of at least one PUCCH configured to transmit PUCCH configured to the UE may be used as HARQ-ACK timing relation indication time unit, and this method may be implemented more easily.

Or, when the UE may transmit HARQ-ACK information in a plurality of serving cells or PUCCH of bandwidth part, the slot length of the most segment of the slot lengths of PUCCH subcarrier Spatial Configuration (SCS) of at least one PUCCH for transmitting HARQ-ACK configured to the UE may be used as HARQ-ACK timing relation indication time unit, and the PUCCH resource may be indicated more accurately by using this method.

In step S1020, more than one timing relation indication field may be included in the DCI scheduling the PDSCH to indicate the timing relation k1 of HARQ-ACK of the PDSCH, and the UE may determine the timing relation of HARQ-ACK according to the timing relation indication field indicated by the signaling (e.g., higher layer signaling configuration indication).

Therefore, according to the embodiment of the present invention, the HARQ-ACK timing relationship of the PDSCH may be determined according to signaling or preset, and wherein the number of the timing relationship indication fields included in the downlink control information DCI scheduling the PDSCH may be one or more for indicating the HARQ-ACK timing relationship of at least one UE, respectively.

For example, M timing relationship indication fields exist in DCI scheduling a multicast PDSCH, where M is a positive integer, each timing relationship indication field is used to indicate a HARQ-ACK timing relationship of at least one UE, and the HARQ-ACK timing relationship of each timing relationship indication field is configured independently, and may be the same or different. That is, each timing relationship indication field indicates one of a plurality of HARQ-ACK timing relationships configured by higher layer signaling, and the UE determines the HARQ-ACK timing relationship according to the indicated timing relationship indication field.

Step S1030 is similar to step S930 and will not be described here.

Method 2.3

In method 2.3, for each user equipment, UE, a referenced HARQ-ACK timing relation indication time unit is configured.

Fig. 11 illustrates an exemplary flow diagram of a method 1100 for determining HARQ-ACK information for transmitting PDSCH in accordance with an embodiment of the present invention. The method 1100 is implemented at the UE side. The method 1100 may be included in step S540 of fig. 5.

As shown in fig. 11, in step S1110 of the method 1100, it is determined that the referenced HARQ-ACK timing relationship indicates a time unit.

In step S1120, a position where k1 is 0 is determined based on the referenced HARQ-ACK timing relationship indication time unit and PDSCH reception time unit.

In step S1130, a transmission time unit of the PUCCH is determined based on the referenced HARQ-ACK timing relationship indication time unit and PUCCH time unit.

In step S1140, HARQ-ACK information is transmitted in a transmission time unit of the PUCCH.

Where k1 is the HARQ-ACK timing relationship and the position where k1 is 0 is the HARQ-ACK timing relationship reference point.

For example, the PDSCH is transmitted in time unit n, the PUCCH that transmits the HARQ-ACK of the PDSCH is transmitted in time unit n + k1, k1 is the timing relationship of the HARQ-ACK of the PDSCH, and both n and k1 indicate the time unit as the time unit with the referenced HARQ-ACK timing relationship.

For example, for a multicast PDSCH scheduled by one DCI, when there is only one HARQ-ACK timing relationship indication field in the DCI, the indication field is called PDSCH-to-HARQ _ feedback timing indicator field.

The determination of the HARQ-ACK timing relationship for the UE is as follows.

For the UE, a reference HARQ-ACK timing relationship indication Time unit (Time unit may also be referred to as Time granularity) may be configured, and the reference HARQ-ACK timing relationship indication Time unit of the UE may be indicated by a display indication or an implicit indication.

In step S1110, as an example of displaying indication, the UE may configure a reference HARQ-ACK timing relationship indication time unit by receiving a Higher-layer signaling (high-layer signaling), or the reference HARQ-ACK timing relationship indication time unit is preset.

For example, a slot length (here, the slot length is taken as an example, and an Orthogonal Frequency Division Multiplexing (OFDM) symbol length may also be taken as a time unit) for determining that the SCS configuration (μ) is 0 is preset as the HARQ-ACK timing relationship indication time unit of the reference of the UE, that is, the HARQ-ACK timing relationship indication time unit of the reference of the UE is 1 millisecond. At this time, the HARQ-ACK timing relation of the UE takes the HARQ-ACK timing relation indication time unit of the reference of the UE as an indication time unit no matter whether the SCS of the PUCCH for transmitting the HARQ-ACK by the UE is the same as the HARQ-ACK timing relation indication time unit of the reference of the UE.

For example, the SCS of the PUCCH for UE transmission of HARQ-ACK for multicast PDSCH is configured to be 1, the reference HARQ-ACK timing relationship configured for the UE indicates that the time unit configures the slot length with SCS (μ) being 0, and then the HARQ-ACK timing relationship of the UE indicates that the time unit configures the slot length with SCS (μ) being 0.

Alternatively, the UE's referenced HARQ-ACK timing relationship indicates the slot length that the time unit can configure for SCS for multicast PDSCH.

As an example of an implicit indication, the UE's referenced HARQ-ACK timing relationship indicates the slot length that the time unit can be configured for the SCS of the PDCCH scheduling the PDSCH.

The method has the advantages that the UE uses the unified reference HARQ-ACK timing relation to indicate the time unit, the HARQ-ACK timing relation can be indicated for a plurality of UEs in different uplink service cells through one timing relation indication field, and in addition, all the UEs can feed back the HARQ-ACK of the PDSCH in time.

Assuming that the slot length of the PUCCH for transmitting HARQ-ACK is a, the slot length of the multicast PDSCH for generating HARQ-ACK is B, and the slot length of the reference HARQ-ACK timing relationship indication time unit is C, the HARQ-ACK timing relationship indication time unit indicates the slot length of the time unit C as the reference HARQ-ACK timing relationship indication time unit.

In addition, the configuration of the slot length C of the reference HARQ-ACK timing relationship indication time unit may also be limited by presetting, for example, C may be limited to be equal to or less than a, when one reference HARQ-ACK timing relationship indication time unit can only overlap with one PUCCH slot length, PUCCH can be transmitted in any slot. Of course, embodiments of the invention are not limited thereto.

In step S1120, the position where k1 is 0 is determined based on the reference HARQ-ACK timing relationship indication time unit C and PDSCH time unit B, which will be described in detail below in terms of different relationships between the reference HARQ-ACK timing relationship indication time unit and PDSCH time unit. Here, the relation between the referenced HARQ-ACK timing relation indication time unit and the PDSCH time unit means the relation between the length of the referenced HARQ-ACK timing relation indication time unit and the length of the PDSCH time unit.

When the PDSCH reception time unit B is the same as the reference HARQ-ACK timing relationship indication time unit C, i.e., B is equal to C, the position where k1 for transmitting HARQ-ACK is 0 overlaps in time with the reception time unit of PDSCH.

When the PDSCH reception time element B is smaller than the reference HARQ-ACK timing relationship indication time element C, i.e. B < C, the PDSCH reception time element overlaps only one reference HARQ-ACK timing relationship indication time element, so the position where k1 for transmitting HARQ-ACK is 0 overlaps in time with the PDSCH reception time element.

Fig. 12 and 13 illustrate diagrams for determining the position of the HARQ-ACK timing relationship reference point k1 being 0 according to an embodiment of the present invention.

When the PDSCH reception time unit B is larger than the reference HARQ-ACK timing relationship indication time unit, i.e., B > C, the position where k1 for transmitting HARQ-ACK is 0 overlaps in time with a time period of one of the PDSCH reception time units, which is referred to as the HARQ-ACK timing relationship indication time unit length. Since B > C, a PDSCH reception time unit overlaps with a plurality of reference HARQ-ACK timing relationship indication time units, one time unit can be determined from the plurality of reference HARQ-ACK timing relationship indication time units overlapping with the PDSCH reception time unit as a position where k1 for transmitting HARQ-ACK is 0. The indication may be made, for example, by a preset determination or a higher layer signaling configuration.

For example, the overlapping in time of the position where k1 is 0 and the time period in which the HARQ-ACK timing relationship for one reference in the PDSCH reception time unit indicates the time unit length includes: the position where k1 is 0 overlaps in time with the time period where the HARQ-ACK timing relationship for the first reference in the PDSCH reception time unit indicates the time unit length as shown in fig. 12, or the position where k1 is 0 overlaps in time with the time period where the HARQ-ACK timing relationship for the last reference in the PDSCH reception time unit indicates the time unit length as shown in fig. 13.

By adopting the method, the position where k1 for transmitting the HARQ-ACK is 0 is the time overlapping of the last PDSCH receiving time unit with the same length as the reference HARQ-ACK timing relation indication time unit in the PDSCH receiving time unit, so that the UE can be ensured to finish the processing of the PDSCH within the processing time of the PDSCH.

In step S1130, a transmission time unit of the PUCCH is determined based on the reference HARQ-ACK timing relationship indication time unit and the PUCCH time unit, which will be described in detail below according to a different relationship between the reference HARQ-ACK timing relationship indication time unit C and the PUCCH time unit a. Here, the reference HARQ-ACK timing relationship indicates a relationship between a time unit and a PUCCH time unit, and means the reference HARQ-ACK timing relationship indicates a relationship between a length of the time unit and a length of the PUCCH time unit.

First, the k1 position is determined based on the position where k1 is 0.

When the PUCCH time unit a is equal to the referenced HARQ-ACK timing relationship indication time unit C, i.e., a ═ C, one referenced HARQ-ACK timing relationship indicates that the time unit overlaps with the time unit of one PUCCH, so the transmission time unit (e.g., slot) of the PUCCH of HARQ-ACK overlaps in time with the k1 position.

When the PUCCH time unit a is larger than the reference HARQ-ACK timing relationship indicates time unit C, i.e. a > C, one reference HARQ-ACK timing relationship indicates that the time unit overlaps with one PUCCH time unit, so the transmission time unit (e.g. slot) of the PUCCH of HARQ-ACK overlaps in time with the k1 position.

Fig. 14 and 15 illustrate diagrams for determining a transmission time unit of a PUCCH according to an embodiment of the present invention.

When the PUCCH time unit a is smaller than the referenced HARQ-ACK timing relationship indicates time unit C, i.e., a < C, time periods of one PUCCH time unit length in the PUCCH transmission time unit k1 positions overlap in time.

In this case, one reference HARQ-ACK timing relationship indication time unit overlaps with a plurality of PUCCH time units, and one PUCCH time unit may be determined as a transmission time unit of the PUCCH from a plurality of PUCCH time units (the plurality may be 2, 4, or the like, and 2 will be described as an example) overlapping with the reference HARQ-ACK timing relationship indication time unit. For example, this may be indicated by a preset determination or a higher layer signaling configuration.

For example, the transmission time unit of the PUCCH overlaps in time with a time period of the first PUCCH time unit length in the k1 position. For example, a first PUCCH time unit of a plurality of PUCCH time units (which may be 2, 4, etc., and will be described below by taking 2 as an example) overlapping with the reference HARQ-ACK timing relationship indication time unit indicated by k1 is selected as the uplink PUCCH time unit (or the uplink PUCCH time unit is replaced with a PUCCH time unit containing an available PUCCH transmission resource), and as shown in fig. 14, this method can ensure that HARQ-ACK is transmitted in the uplink time unit, and HARQ-ACK information is transmitted as early as possible, ensuring latency requirements.

Or, overlap in time with the time period of the last PUCCH time unit length in the k1 position. For example, the last PUCCH time unit in a plurality of overlapping (the plurality may be 2, 4, etc., and 2 will be described below as an example) with the reference HARQ-ACK timing relationship indication time unit indicated by k1 is selected as the uplink PUCCH time unit (or the uplink PUCCH time unit is replaced with a PUCCH time unit containing an available PUCCH transmission resource) as the transmission time unit of the PUCCH, as shown in fig. 15.

Third embodiment

Fig. 16 shows an exemplary flow diagram of a method 1600 for receiving hybrid automatic repeat request acknowledgement, HARQ-ACK, information in accordance with an embodiment of the invention. The method 1600 is implemented at the base station side.

As shown in fig. 16, in step S1610 of the method 1600, downlink control information DCI is transmitted.

In step S1620, the PDSCH is transmitted based on the DCI.

In step S1630, HARQ-ACK information of the PDSCH is received on the uplink serving cell or uplink carrier.

Therefore, according to the embodiment of the present invention, it is possible to determine a serving cell or carrier for HARQ-ACK transmission of a PDSCH and receive HARQ-ACK information of the PDSCH on the determined serving cell or carrier.

A configuration message may be sent containing the configured uplink serving cell or uplink carrier for multicasting HARQ-ACK information for the PDSCH.

In one example, a k1 field indication value in the DCI transmitted by the base station selects a timing relationship k1 value for each UE by using the k1 set of each UE or UE group shown in table 2, and then indicates a timing relationship k1 value for at least one UE by using one k1 field indication value, for example, the base station determines that the timing relationship k1 value of UE-1 is 2, and UE-1 indicates a time unit with a slot length of 0 SCS configuration (μ) as HARQ-ACK timing relationship. The timing relationship k1 of UE-2 is 3, the slot length of UE-1 with SCS configuration (mu) of 1 is HARQ-ACK timing relationship indication time unit, the timing relationship k1 of UE-3 is 4, the slot length of UE-1 with SCS configuration (mu) of 1 is HARQ-ACK timing relationship indication time unit, and then the indication value is 01 through the k1 field to indicate to UE-1, UE-2 and UE-3.

In one example, the configuration message may indicate that the uplink serving cell or uplink carrier transmitting the HARQ-ACK information for the multicast PDSCH is the uplink serving cell or uplink carrier transmitting the HARQ-ACK information for the unicast PDSCH.

For example, UE-1 receives HARQ-ACK for unicast PDSCH transmitted on uplink serving cell 1 and UE-1 receives HARQ-ACK for multicast PDSCH also transmitted on uplink serving cell 1, while UE-2 receives HARQ-ACK for unicast PDSCH transmitted on uplink serving cell 2 and UE-2 receives HARQ-ACK for multicast PDSCH also transmitted on uplink serving cell 2.

Thus, all UEs or groups of UEs receiving PDSCH may send HARQ-ACK information on a shared uplink serving cell or uplink carrier.

In one example, the HARQ-ACK timing relationship may be indicated in a timing relationship indication field in DCI scheduling the multicast PDSCH.

The timing relation indication field is a timing relation indication field in the DCI, wherein the DCI includes at least 1 timing relation indication field for indicating at least one HARQ-ACK timing relation, respectively.

When the UE has a set of HARQ-ACK timing relationships, the HARQ-ACK timing relationships in the set of HARQ-ACK timing relationships may be indicated by a timing relationship indication field. The set of HARQ-ACK timing relationships is a set corresponding to a multicast PDSCH.

For example, there are 3 UEs receiving the multicast PDSCH, SCS configuration (μ) of the PUCCHs transmitting HARQ-ACK for UE-1, UE-2, UE-3, UE-1 and UE-2 is 0, SCS configuration (μ) of the PUCCH for transmitting HARQ-ACK for UE-3 is 1, there are two HARQ-ACK timing relationship indication fields in the DCI scheduling the multicast PDSCH, the first HARQ-ACK timing relationship indication field indicates HARQ-ACK timing relationship for UE-1 and UE2 using slot length with SCS configuration (μ) of 0 as a time unit, and the second HARQ-ACK timing relationship indication field indicates HARQ-ACK timing relationship for UE-3 using slot length with configuration (μ) of 1 as a time unit.

Furthermore, the DCI may further include: the referenced HARQ-ACK timing relationship indicates a time unit.

Fourth embodiment

PUCCH resource conflict resolution

Fig. 17 shows an exemplary flowchart of a method 1700 for transmitting HARQ-ACK for PDSCH according to an embodiment of the present invention. The method 1700 is implemented at the UE side.

As shown in fig. 17, in step S1710 of method 1700, downlink control information DCI is received, including a physical downlink control channel PUCCH resource indication in the DCI.

In step S1720, the PDSCH is received based on the DCI.

In step S1730, PUCCH resources for transmitting HARQ-ACK information of the PDSCH are determined according to the PUCCH resource indication.

In step S1740, when the determined PUCCH resource is not available, HARQ-ACK information of the PDSCH is transmitted on an available PUCCH resource subsequent to the determined PUCCH resource.

According to the embodiment of the present invention, the available PUCCH resource after the determined PUCCH resource is the first available resource among the available PUCCH resources after the determined PUCCH resource.

The PDSCH may be a Semi-persistent Scheduling (SPS) PDSCH, or alternatively, the PDSCH may be a DCI scheduled PDSCH.

Since one DCI is to indicate PUCCH resources for multiple UEs, and uplink downlink slot distribution of a serving cell transmitting HARQ-ACK may be different for different UEs, therefore, for the UE, the indicated PUCCH resources may be in an unavailable time unit (e.g., the indicated PUCCH resources for transmission of HARQ-ACK are contained within a downlink OFDM symbol), the PUCCH for transmission of HARQ-ACK may be delayed to within an available time unit, in order to guarantee the delay requirement of HARQ-ACK, however, HARQ-ACK cannot be delayed indefinitely, a preset value of available PUCCH resources for transmitting HARQ-ACK can be determined, i.e., a maximum delay time, which may be a maximum time interval between a determined time unit of the PUCCH transmitting the HARQ-ACK and a time unit of a first available PUCCH resource among available PUCCH resources transmitting the HARQ-ACK after the delay.

When there is only one serving cell transmitting the PUCCH, the time unit of the maximum delay time may be the slot length of the PUCCH transmitting the HARQ-ACK. When there is more than one serving cell for transmitting the PUCCH and at least 2 serving cells have different SCS configurations, the time unit of the maximum delay time may be the slot length of the PUCCH transmitted in the pcell (pscell), and the method may prevent the base station and the UE from understanding inconsistency of the time units of the maximum delay time during reconfiguration. The time unit of the maximum delay time can be a time slot with the longest time slot length for transmitting PUCCH in at least two serving cells configured for transmitting HARQ-ACK to the UE, and the method can prevent the maximum delay time from ending in the middle of the time slot. The time unit of the maximum delay time can be a time slot with the shortest time slot length for transmitting PUCCH in at least two serving cells configured for transmitting HARQ-ACK to the UE, and the maximum delay time can be more accurately determined by adopting the method. The time unit of the maximum delay time may be a preset slot length configured by the SCS, and the advantage of using this method is that the time unit of the maximum delay time does not need to be changed according to the SCS of different serving cells.

When the length of the time unit of the maximum delay time is less than the slot length of the transmission PUCCH, if the maximum delay time ends within the slot of the transmission PUCCH, one method is to consider that the PUCCH ends later than the maximum delay time, and the HARQ-ACK of the PDSCH cannot be delayed to this PUCCH transmission, as shown in fig. 23, which is advantageous in that implementation is relatively simple. Another method is to consider that the PUCCH is already beyond the maximum delay time and the HARQ-ACK of the PDSCH cannot be delayed until the PUCCH transmission if the end of the last OFDM symbol of the PUCCH is later than the maximum delay time, as shown in fig. 24.

A time interval between a first available resource among available PUCCH resources subsequent to the determined PUCCH resource and the determined PUCCH resource does not exceed a preset value.

If the time interval between the delayed available time unit of the PUCCH resource for transmitting the HARQ-ACK and the determined time unit of the PUCCH for transmitting the HARQ-ACK is larger than a preset value, canceling the PUCCH transmission of the HARQ-ACK; and if the time interval between the time unit of the available delayed PUCCH for transmitting the HARQ-ACK and the time unit of the indicated PUCCH for transmitting the HARQ-ACK does not exceed the threshold T, transmitting the PUCCH for transmitting the HARQ-ACK in the delayed PUCCH time unit.

The method has the advantages that the HARQ-ACK transmission of the PDSCH, such as the HARQ-ACK transmission of the multicast PDSCH, is not canceled as much as possible, and the performance of the PDSCH is ensured. The preset value may be determined by receiving a higher layer signaling configuration.

HARQ-ACK transmission method for PDSCH

According to the embodiment of the present invention, the HARQ-ACK information for transmitting the PDSCH in step S1740 may include one of the following according to the signaling indication or the received signal strength of the user equipment UE:

feeding back a NACK on the determined PUCCH resource when the PDSCH is not correctly decoded;

feeding back ACK on the determined PUCCH resource when the PDSCH is correctly decoded, and feeding back NACK on the determined PUCCH resource when the PDSCH is not correctly decoded; and

neither ACK nor NACK is fed back.

The UE may determine whether to feed back the HARQ-ACK by receiving signaling (including higher layer signaling configuration, medium access layer signaling indication, and physical layer signaling indication) sent by the base station or according to a preset.

The UE may also determine whether to feed back the HARQ-ACK according to its received signal strength, for example, a signal strength Threshold (Threshold-1) may be defined, and if the RSRP measured by the UE is less than Threshold-1, the UE feeds back the HARQ-ACK, otherwise, the UE does not feed back the HARQ-ACK. This can save UE transmission power

In one example, if the UE correctly decodes the PDSCH, the UE does not feed back HARQ-ACK information, whereas if the UE receives the PDCCH but does not correctly decode the PDSCH, the UE feeds back a NACK on the PUCCH resource.

In one example, the UE feeds back an ACK if the UE correctly decodes the PDSCH, and feeds back a NACK if the UE does not correctly decode the PDSCH.

In one example, the UE does not feed back HARQ-ACKs, i.e., neither ACKs nor NACKs.

The distance between the UE receiving the PDSCH and the base station is far and near, the signal quality received by the UE far from the base station is poor, the signal quality received by the UE near to the base station is good, the signal received by the UE not far from the base station is general, the multicast PDSCH adopts a determined coding modulation mode, and the PDCCH of the multicast PDSCH is scheduled to adopt a determined Aggregation Level (AL). At the moment, the quality of signals received by the UE close to the base station is good, and the error probability of the detection of the PDCCH and the decoding of the PDSCH is extremely low; the signals received by the UE which are not far from or near the base station are general, the detection error probability of the PDCCH is very low, and the decoding error of the PDSCH has certain probability; the quality of signals received by UE far away from the base station is poor, and the detection of the PDCCH and the decoding of the PDSCH have certain error probability.

For the UE which only transmits NACK, if the UE fails to detect PDCCH, the UE does not feed back NACK, at the moment, if other UE does not feed back NACK, the base station considers that the decoding of the multicast PDSCH of all the UE is correct, so that the PDSCH is not retransmitted any more, and the UE which fails to detect PDCCH has no chance to receive the data again, or can receive the data only through high-level retransmission.

If the UE transmits both ACK and NACK, when the UE fails to detect the PDCCH, the UE does not send HARQ-ACK, the base station can blindly detect whether the UE feeds back the HARQ-ACK on the PUCCH resource where the UE feeds back the HARQ-ACK, if the base station does not detect the HARQ-ACK of the UE, the base station knows that the UE fails to detect the PDCCH for scheduling the multicast PDSCH, the base station can retransmit the PDSCH, and the UE can also receive the retransmission of the PDSCH.

Case of overlapping PUCCH resources

When the determined PUCCH resource may overlap with another PUCCH resource in time, the HARQ-ACK information for transmitting the PDSCH in step S1740 may further include one of the following:

transmitting the multiplexed HARQ-ACK information on the determined PUCCH resources;

transmitting HARQ-ACK information of the PDSCH according to the priority of the HARQ-ACK information.

For example, when a UE can receive both a multicast PDSCH and a unicast PDSCH, PUCCH resources for HARQ-ACK transmission of the multicast PDSCH may overlap with PUCCH resources for HARQ-ACK transmission of the unicast PDSCH.

When the PUCCH resource for transmitting HARQ-ACK of multicast PDSCH and the PUCCH resource for transmitting HARQ-ACK of unicast PDSCH overlap in time, the HARQ-ACK of multicast PDSCH and the HARQ-ACK of unicast PDSCH may be multiplexed together, and the HARQ-ACK of multiplexed multicast PDSCH and the HARQ-ACK of unicast PDSCH may be transmitted using the PUCCH resource for HARQ-ACK of unicast PDSCH, which is the PUCCH resource indicated by PRI in DCI scheduling unicast PDSCH.

By adopting the method, the phenomenon that the HARQ-ACK of the PDSCH is discarded and the performance of the PDSCH is influenced can be prevented.

In addition, as PUCCH resources for transmitting the HARQ-ACK of the multicast PDSCH can be shared by a plurality of UEs, the method can prevent the HARQ-ACK of the unicast PDSCH of the UE from colliding with the HARQ-ACK of the multicast PDSCH of other UEs.

When the PUCCH resource for transmitting the HARQ-ACK of the multicast PDSCH and the PUCCH resource for transmitting the HARQ-ACK of the unicast PDSCH are overlapped in time, one type of HARQ-ACK can be transmitted according to the priority level of the HARQ-ACK of the multicast PDSCH and the priority level of the HARQ-ACK of the unicast PDSCH. That is, when a PUCCH transmitting high priority HARQ-ACK overlaps a PUCCH transmitting low priority HARQ-ACK, the high priority HARQ-ACK is transmitted, the low priority HARQ-ACK is discarded, or the low priority HARQ-ACK is transmitted with a delay.

For example, if the priority of the PUCCH transmitting HARQ-ACK of unicast PDSCH is higher than the priority of the PUCCH transmitting HARQ-ACK of multicast PDSCH, the HARQ-ACK of unicast PDSCH is transmitted and the HARQ-ACK of multicast PDSCH is discarded. The priority of the PUCCH may be configured by higher layer signaling or determined according to a preset.

According to the embodiment of the invention, the UE can select one mode from the two modes by receiving signaling (including higher layer signaling configuration, media access layer signaling indication and physical layer signaling indication, wherein the physical layer signaling is information indication in DCI).

Further, the UE may determine to adopt different schemes according to different situations.

For example, when the UE transmits HARQ-ACK of multicast PDSCH using its own independent PUCCH resource, HARQ-ACK of multicast PDSCH and HARQ-ACK of unicast PDSCH are multiplexed together when PUCCH resources transmitting HARQ-ACK of multicast PDSCH and PUCCH resources transmitting HARQ-ACK of unicast PDSCH overlap in time.

When the UE transmits the HARQ-ACK of the multicast PDSCH by using the configured PUCCH resources, when the PUCCH resources for transmitting the HARQ-ACK of the multicast PDSCH and the PUCCH resources for transmitting the HARQ-ACK of the unicast PDSCH are overlapped in time, one type of HARQ-ACK is selectively transmitted according to the priority level of the HARQ-ACK of the multicast PDSCH and the priority level of the HARQ-ACK of the unicast PDSCH.

When the UE transmits the HARQ-ACK of the multicast PDSCH by using the configured PUCCH resources, when the PUCCH resources for transmitting the HARQ-ACK of the multicast PDSCH and the PUCCH resources for transmitting the HARQ-ACK of the unicast PDSCH are overlapped in time, the UE feeds back NACK only when the UE receives the PDCCH but does not decode the multicast PDSCH correctly, and multiplexes the HARQ-ACK of the multicast PDSCH and the HARQ-ACK of the unicast PDSCH together. When the UE receives the PDCCH and correctly decodes the multicast PDSCH, the UE does not feed back the HARQ-ACK.

Or, when the PUCCH resource for transmitting the HARQ-ACK of the multicast PDSCH and the PUCCH resource for transmitting the HARQ-ACK of the unicast PDSCH overlap in time, when the UE transmits the HARQ-ACK of the multicast PDSCH using the shared PUCCH resource (that is, the HARQ-ACK information transmission method for transmitting the multicast PDSCH only when the multicast PDSCH is not correctly decoded), at this time, when the HARQ-ACK of the multicast PDSCH and the HARQ-ACK of the unicast PDSCH are multiplexed together, and the UE receives the PDCCH and incorrectly decodes the multicast PDSCH, the HARQ-ACK information of the multicast PDSCH is NACK, and when the UE receives the PDCCH and correctly decodes the multicast PDSCH, the HARQ-ACK information of the multicast PDSCH is ACK.

Since the PUCCH resource for transmitting the HARQ-ACK of the multicast PDSCH can be shared by a plurality of UEs, the method can prevent the HARQ-ACK of the unicast PDSCH of the UE from colliding with the HARQ-ACK of the multicast PDSCH of other UEs.

For the same UE, when the PUCCH for transmitting the HARQ-ACK of the multicast PDSCH and the PUCCH for transmitting the HARQ-ACK of the unicast PDSCH are overlapped in time, and the HARQ-ACK of the multicast PDSCH and the HARQ-ACK of the unicast PDSCH cannot be transmitted simultaneously, and the priority of the PUCCH for transmitting the HARQ-ACK of the multicast PDSCH is high, and only when the HARQ-ACK information transmission mode of the multicast PDSCH is transmitted when the multicast PDSCH is not decoded correctly, if the multicast PDSCH is not decoded correctly, the HARQ-ACK information of the multicast PDSCH is transmitted as NACK, and if the multicast PDSCH is decoded correctly, the HARQ-ACK information of the multicast PDSCH is not transmitted, the HARQ-ACK information of the unicast PDSCH is transmitted, so that the condition that the HARQ-ACK information of the unicast PDSCH is discarded is reduced.

Further, according to an embodiment of the present invention, the UE may determine whether to transmit the HARQ-ACK according to a time unit in which Downlink Control Information (DCI) is located. Assuming that a time unit of Downlink Control Information (DCI) is L, and L mod Q is S, S is an index of a UE sending HARQ-ACK, where Q is a positive integer and configured by higher layer signaling, and mod is a modulo operation. Therefore, PUCCH resources can be saved and power consumption of UE for transmitting PUCCH can be reduced

When the HARQ-ACK of the multicast PDSCH and the HARQ-ACK of the unicast PDSCH are multiplexed together, the number of bits of the HARQ-ACK of the multicast PDSCH transmitted together with the HARQ-ACK of the unicast PDSCH cannot be too large in order to ensure the performance of the HARQ-ACK of the unicast PDSCH, and thus it is necessary to bundle a plurality of bits of the HARQ-ACK of the multicast PDSCH to reduce the number of bits.

For example, the number of bits of HARQ-ACK for multicast PDSCH multiplexed with HARQ-ACK for unicast PDSCH in one time unit is limited to a value M, where M is a positive integer, e.g., M is equal to 1, and M can be determined by higher layer signaling configuration. If the number of bits of HARQ-ACK of the multicast PDSCH multiplexed with HARQ-ACK of the unicast PDSCH exceeds M, bundling is required to make the number of bits of HARQ-ACK of the multicast PDSCH transmitted less than or equal to M.

One method of bit bundling of the available HARQ-ACKs is to 'and' operate the HARQ-ACK bits. For example, if the bit value of the first HARQ-ACK is 'NACK' and the bit value of the second HARQ-ACK is 'ACK', the bit value of the first HARQ-ACK and the bit value of the second HARQ-ACK are 'anded with' the HARQ-ACK after operation 'and if the bit value of the first HARQ-ACK is' ACK 'and the bit value of the second HARQ-ACK is' ACK ', the bit value of the first HARQ-ACK and the bit value of the second HARQ-ACK are' anded with 'the HARQ-ACK after operation' and are 'ACK'.

In this way, the number of bits of HARQ-ACK for multicast PDSCH is semi-statically configured, while the number of bits of HARQ-ACK for unicast PDSCH can be dynamically determined according to Downlink Assignment Information (DAI). For example, in the time slot n, the number M of the HARQ-ACK bits of the multicast PDSCH, the total number M + L of the multiplexed HARQ-ACK bits according to the number L of the HARQ-ACK bits of the unicast PDSCH, in the time slot n + k, the number M of the HARQ-ACK bits of the multicast PDSCH, and the total number M + Q of the HARQ-ACK bits according to the number Q of the HARQ-ACK bits of the unicast PDSCH are calculated, wherein L and Q are positive integers.

When the HARQ-ACK of the multicast PDSCH and the HARQ-ACK of the unicast PDSCH are multiplexed together, a method of jointly counting DAI may be adopted, that is, the number of bits of HARQ-ACK is determined by using the multicast PDSCH as the unicast PDSCH, and at this time, each UE receiving the multicast PDSCH should have its own DAI field.

The above describes a case where PUCCH for transmitting HARQ-ACK of multicast PDSCH and PUCCH for transmitting HARQ-ACK of unicast PDSCH overlap in time, but the embodiments of the present invention are not limited thereto, and it should be understood by those skilled in the art that in a case where PUCCH for transmitting HARQ-ACK of multicast PDSCH and PUSCH for transmitting HARQ-ACK of unicast PDSCH overlap in time, HARQ-ACK of multicast PDSCH and HARQ-ACK of unicast PDSCH may be multiplexed, similar to the method in the case of PUCCH, except that PUSCH replaces PUCCH.

Power control of HARQ-ACK for PDSCH

For the UE, transmitting HARQ-ACK information of the PDSCH in step S1740 may further include: determining the transmission power of the PUCCH resources according to the power control command in the DCI; and transmitting HARQ-ACK information of the PDSCH on the determined PUCCH resource with the transmission power.

Specifically, the UE receives DCI, wherein the DCI indicates a power control command, and determines PUCCH transmission power based on the power control command, and transmits HARQ-ACK information for multicast PDSCH on PUCCH at the power.

For example, the PUCCH transmitting HARQ-ACK for multicast PDSCH and the PUCCH transmitting HARQ-ACK for unicast PDSCH both require power control commands to adjust power. When the group-common power control command transmission is used, one way is: adopting a TPC command in a scheduling unicast PDSCH and a TPC command in DCI Format 2_2, wherein information in the DCI Format 2_2 is provided with CRC scrambled by TPC-PUCCH-RNTI, and an information block is as follows: { TPC 1, TPC 2, …, TPC N }.

The PUCCH transmitting HARQ-ACK of the multicast PDSCH and the PUCCH transmitting HARQ-ACK of the unicast PDSCH share the same TPC information block, and the DCI is scrambled based on the first RNTI. For example, TPC 1 is used for power control of PUCCH for transmission of HARQ-ACK for unicast PDSCH and for power control of PUCCH for transmission of HARQ-ACK for multicast PDSCH.

The method has the advantage that the PUCCH for transmitting the HARQ-ACK of the unicast PDSCH and the PUCCH for transmitting the HARQ-ACK of the multicast PDSCH can be timely adjusted in power.

The other mode is as follows: by adopting DCI Format 2_2, information in the DCI Format 2_2 carries CRC scrambled by MBS-PUCCH-RNTI, wherein the information block is as follows: { TPC 1, TPC 2, …, TPC N }, the PUCCH transmitting HARQ-ACK of multicast PDSCH uses one TPC information block, and DCI is scrambled based on the second RNTI. The TPC is only used for power control of PUCCH for transmitting HARQ-ACK for multicast PDSCH.

The benefit of this approach is that the power control of the PUCCH used for transmitting HARQ-ACK for multicast PDSCH is more accurately adjusted.

The third mode is that: a new DCI Format is adopted, the new DCI Format is recorded as DCI Format x, information in the DCI Format x carries CRC scrambled by MBS-PUCCH-RNTI, and information blocks are as follows: { TPC 1, TPC 2, …, TPC N }, each PUCCH transmitting HARQ-ACK of multicast PDSCH uses one TPC information block for power control of each UE, and DCI is scrambled based on the second RNTI. The TPC is used only for power control of PUCCH transmitting HARQ-ACK of multicast PDSCH. The payload size (payload size) of the DCI may be the same as the payload size (payload size) of the DCI scheduling the MBS PDSCH. That is, the information bit number of the DCI may be less than or equal to the payload size of the DCI scheduling the MBS PDSCH, and if the information bit number of the DCI is less than the payload size of the DCI scheduling the MBS PDSCH, the payload size of the DCI is made to be the same as the payload size of the DCI scheduling the MBS PDSCH by complementing "0" to the information bit of the DCI. Therefore, the number of blind detections of the PDCCH can be reduced.

By adopting the method, the UE without unicast service transmission can be ensured to carry out effective closed-loop power control, the PDCCH detection complexity is not additionally increased, and the blind detection times of the PDCCH can be reduced.

Fifth embodiment

Aperiodic Channel State Information (CSI) report

Fig. 18 shows an exemplary flowchart of a method 1800 of sending aperiodic channel state information, CSI, reports according to an embodiment of the invention. The method 1800 is implemented at the UE side.

As shown in fig. 18, in step S1810 of the method 1800, downlink control information DCI is received, including a CSI drive field in the DCI.

In step S1820, an aperiodic CSI report for a multicast physical downlink shared channel PDSCH is transmitted based on a CSI driver field.

A field for driving aperiodic CSI reports may be included in the received DCI, and this field may be referred to as a CSI driving field, e.g., CSI Request.

For example, the CSI drive field may be 2 bits and may indicate a total of 4 sets of aperiodic CSI reports, as shown in table 3.

Table 3: correspondence between CSI-driven field values and types of aperiodic CSI reports

CSI drive field value	Types of aperiodic CSI reports
		00	Non-feedback aperiodic CSI report
01	Aperiodic CSI report-configured by higher layer signaling
		10	Non-weekly configuration of higher layer signalingPeriodic CSI report two
11	Aperiodic CSI report three configured by higher layer signaling

After the UE receives the CSI driver field, it may be determined whether an aperiodic CSI report needs to be sent by the following method.

Method 5.1

All UEs that receive the CSI driving field for driving the aperiodic CSI report in the DCI transmit the aperiodic CSI report.

For example, in the case of table 3, the UE may determine the type of aperiodic CSI report corresponding to the value of the CSI driver field, i.e., whether to not feed back the aperiodic CSI report, feed back the aperiodic CSI report one, feed back the aperiodic CSI report two, or feed back the aperiodic CSI report three, according to which of 00, 01, 10, 11 the value is, and then transmit the aperiodic CSI report having the determined type.

Method 5.2

And determining through high-layer signaling configuration, receiving UE which feeds back the aperiodic CSI report aiming at the multicast PDSCH through the high-layer signaling configuration, and receiving a CSI drive field in the DCI, and then sending the aperiodic CSI report by the UE based on the CSI drive field. In contrast, a UE that does not receive a higher layer signaling configuration feedback for aperiodic CSI reports for multicast PDSCH does not send aperiodic CSI reports even if it receives CSI driver fields in DCI.

Method 5.3

And determining, by high-level signaling configuration, the UE which receives the non-periodic CSI report aiming at the multicast PDSCH fed back by the high-level signaling configuration, wherein the value of the CSI drive field in the received DCI is a specific value, and the UE sends the non-periodic CSI report based on the specific value of the CSI drive field. In contrast, a UE that does not receive a higher layer signaling configuration feedback for aperiodic CSI reports for multicast PDSCH does not send aperiodic CSI reports even if it receives CSI driver fields in DCI. Or, the UE receives the aperiodic CSI report for the multicast PDSCH through the higher layer signaling configuration feedback, but the value of the CSI driving field in the DCI is not a specific value, and the UE does not send the aperiodic CSI report.

For example, assuming that UE-1 receives an aperiodic CSI report for a multicast PDSCH by higher layer signaling configuration feedback, UE-1 sends the aperiodic CSI report, i.e., sends an aperiodic CSI report one, only when the CSI drive field value is 01. Otherwise, UE-1 does not send aperiodic CSI report.

Method 5.4

The CSI drive field is included in the DCI, and may be located in at least one of a physical downlink control channel PDCCH that schedules the multicast PDSCH and the multicast PDSCH scheduled by the PDCCH.

In one example, the CSI-driven field may be divided into two parts, a first part being located in the DCI of the PDCCH scheduling the multicast PDSCH and a second part being located in the multicast PDSCH scheduled by the PDCCH. The first partial CSI drive field may be as shown in table 3. The second CSI-driven field determines which UEs need to feed back aperiodic CSI reports, for example, a bitmap (bitmap) method may be used to indicate the aperiodic CSI reports, for example, the second CSI-driven field includes L bits, where L is a natural number, each bit of information in the field determines whether one or a group of UEs send aperiodic CSI reports, and each UE may determine corresponding bit of information of the UE through higher layer signaling configuration. For example, a bit information value of "0" indicates that the UE does not feed back the aperiodic CSI report, and a bit information value of "1" indicates that the UE feeds back the aperiodic CSI report. Namely, when the UE determines the type of the aperiodic CSI report according to the first partial CSI drive field, and determines whether the UE feeds back the aperiodic CSI report according to the second partial CSI drive field.

Method 5.5

The CSI drive field is included in the DCI, in the multicast PDSCH scheduled by the PDCCH. For example, as shown in table 3, each CSI driver field includes 2 bits, and it is determined that at least one UE, i.e., one UE or UE group or a plurality of UEs or a plurality of UE groups, transmits an aperiodic CSI report.

Method 5.6

The UE may also determine whether to send the aperiodic CSI report according to the CSI measured by the UE, for example, whether to send the aperiodic CSI report may be determined according to whether the CSI is within a range. For example, when a CQI Index (CQI Index) is equal to or greater than a predetermined value S, or when the CQI Index is less than S, S is a natural number, the UE transmits an aperiodic CSI report. The UE may obtain S by receiving a higher layer signaling configuration, or the UE may obtain S by receiving a physical layer signaling (information in DCI), for example, the S value may be indicated by an information bit in DCI driving an aperiodic CSI report.

Alternatively, the S value may be determined by a CSI drive field value, as shown in table 4. For example, when the value of the received CSI drive field is 01, the S value may be determined to be S1, and thus, when the CQI index is greater than or equal to S1 (or less than S1), the UE transmits an aperiodic CSI report one.

Table 4: correspondence between CSI drive field value and S value

CSI drive field value	Types of aperiodic CSI reports	S value
			00	Non-feedback aperiodic CSI report	Retention
01	Aperiodic CSI report of higher layer signaling configuration	S1
			10	Aperiodic CSI report of higher layer signaling configuration two	S2
11	Aperiodic CSI report three configured by higher layer signaling	S3

This method may also be used to determine whether the UE sends a Semi-persistent (SP) CSI report, which may replace the aperiodic CSI report. Since the base station wants to know the UE receiving the worst CSI of the multicast PDSCH, the base station can know the CSI of the worst UE by using the method, and other UEs do not need to transmit CSI, thereby reducing CSI transmission.

The method may also be used to determine whether the UE sends periodic CSI reports, which may replace aperiodic CSI reports. Since the base station wants to know the UE receiving the worst CSI of the multicast PDSCH, the base station can know the CSI of the worst UE by using the method, and other UEs do not need to transmit CSI, thereby reducing CSI transmission.

In addition, PUCCH resources for transmitting CQI indications may also be determined according to CQI indices measured by the UE, and the PUCCH resources correspond to different ranges of CQI indices, respectively. The CQI indication may be included in CSI reports (periodic CSI reports, aperiodic CSI reports, or semi-persistent CSI reports).

For example, at least one S value (including higher layer signaling configuration, medium access layer signaling indication, and physical layer signaling indication, which refers to information indication in DCI) may be predetermined, e.g., S _1, S _2, …, S _ L, and S _1< S _2< …, < S _ L, L is an integer greater than 1, the CQI index measured by the UE is assumed to be CQI _ a, if CQI _ a < S _1, the UE sends CQI indication on PUCCH _1, if S _1< ═ CQI _ a < S _2, the UE sends CQI indication on PUCCH _2, and so on, if S _ L-1< <cqi _ a < S _ L, the UE sends CQI indication on PUCCH _ L.

Therefore, when feeding back CSI for the multicast PDSCH, different UEs receiving the multicast PDSCH may share the same PUCCH resource to feed back CSI. For example, the CQI index measured by UE-1 is CQI _ a, S _1< ═ CQI _ a < S _2, UE-1 transmits a CQI indication on PUCCH _2, the CQI index measured by UE-2 is CQI _ b, S _1< ═ CQI _ b < S _2, and UE-2 also transmits a CQI indication on PUCCH _ 2. In this way, when the base station receives a CQI indication on a certain PUCCH, for example, PUCCH _ x, it can know the range of CQI corresponding to the PUCCH _ x, and can select a reasonable MCS according to the range of CQI to schedule the multicast PDSCH. For example, when the base station receives a CQI indication on PUCCH _2, it knows that there is a UE with CQI index CQI _ x, S _1< ═ CQI _ x < S _2, so the base station chooses a reasonable MCS to schedule the multicast PDSCH based on this information.

Therefore, by adopting the method, when a large number of UEs receiving the multicast PDSCH are available, the shared resource is adopted to feed back the CSI, so that the PUCCH resource for feeding back the CSI can be saved.

Those skilled in the art will appreciate that the CSI driver field being 2 bits is merely an example, and the CSI driver field may include fewer or more bits to indicate fewer or more sets of aperiodic CSI reports.

Fig. 19 shows an exemplary flow diagram of a method 1900 for receiving hybrid automatic repeat request acknowledgement HARQ-ACK information according to an embodiment of the invention. The method 1900 is implemented at the base station side.

As shown in fig. 19, in step S1910 of method 1900, downlink control information DCI is transmitted, where a physical downlink control channel PUCCH resource indication is included in the DCI, the PUCCH resource indication specifying a PUCCH resource for transmitting HARQ-ACK information for a PDSCH.

In step S1920, the PDSCH is transmitted based on the DCI.

In step S1930, when the determined PUCCH resource is not available, HARQ-ACK information for the PDSCH is received on an available PUCCH resource subsequent to the determined PUCCH resource.

The method 1900 may further include sending signaling indicating to the user equipment UE one of: feeding back a NACK on the determined PUCCH resource when the PDSCH is not correctly decoded; feeding back ACK on the determined PUCCH resource when the PDSCH is correctly decoded, and feeding back NACK on the determined PUCCH resource when the PDSCH is not correctly decoded; and neither ACK nor NACK is fed back.

A power control command may be included in DCI for determining a transmission power of a PUCCH resource, wherein the DCI is scrambled based on a radio network temporary identifier RNTI.

In one example, power control commands are sent in DCI scrambled based on a first RNTI, the power control commands being applicable to a PUCCH transmitting unicast HARQ-ACK and a multicast HARQ-ACK.

In one example, a power control command is sent in DCI scrambled based on the second RNTI, the power control command being applicable to a PUCCH transmitting a multicast HARQ-ACK.

In one example, the number of information bits of the DCI scrambled based on the second RNTI is less than or equal to the payload size of the DCI scheduling the MBS PDSCH. When there are a plurality of UEs, UE-1 and UE-2 may belong to one subgroup sharing one PUCCH resource, and UE-3 and UE-4 may belong to one subgroup sharing one PUCCH resource.

The subgroup of HARQ-ACKs transmitting the multicast PDSCH may be determined by receiving signaling (including higher layer signaling configuration, medium access layer signaling indication, and physical layer signaling indication, physical layer signaling refers to information indication in DCI). For example, UE-1 receives a higher layer signaling configuration and determines to belong to a first sub-group, and UE-2 receives a higher layer signaling configuration and determines to belong to a first sub-group, so UE-1 and UE-2 share one PUCCH resource to transmit HARQ-ACK of a multicast PDSCH. UE-3 receives the higher layer signaling configuration and determines to belong to the second subgroup, UE-4 receives the higher layer signaling configuration and determines to belong to the second subgroup, therefore UE-3 and UE-4 share one PUCCH resource to transmit HARQ-ACK of the multicast PDSCH.

Alternatively, the subgroup to which the UE belongs may be indicated by implicit signaling. For example, the UEs transmitting HARQ-ACK in the same uplink serving cell belong to one sub-group, e.g., as shown in fig. 19, UE-1 and UE-2 transmit HARQ-ACK in uplink serving cell one, UE-1 and UE-2 belong to one sub-group, UE-3 and UE-4 transmit HARQ-ACK in uplink serving cell two, and UE-3 and UE-4 belong to one sub-group.

This has the advantage that a balance can be struck between saving configuration signalling overhead and avoiding that the UE cannot correctly receive the multicast PDSCH due to missed PDCCH detection by the UE.

In yet another example, different UEs receiving a multicast PDSCH transmit HARQ-ACKs using separate PUCCH resources.

The method has the advantages that if any UE fails to detect the PDCCH, the base station can also know that some UE does not correctly receive the multicast PDSCH through blind detection, and the base station can retransmit the multicast PDSCH.

For the transmission scheme of HARQ-ACK of the multicast PDSCH, the PUCCH Resource may be indicated in a PUCCH Resource set indicated by one PUCCH Resource Indicator (PRI), where the PUCCH Resource set indicated by one PUCCH Resource Indicator includes a PUCCH Resource shared by a group of UEs and a PUCCH Resource used by a single UE, and it is assumed that there are 5 UEs in total for receiving the multicast PDSCH, and each UE is: UE-1, UE-2, UE-3, UE-4 and UE-5, PRI may contain 2 bits, as shown in Table 3, UE-3 and UE-4 share one PUCCH resource, and UE independently uses one PUCCH resource.

For example, assume that, according to the signaling indication, UE-1 and UE-2 do not send HARQ-ACK, UE-3 and UE-4 only send NACK, and UE-5 sends both NACK and ACK.

By adopting different HARQ-ACK transmission modes for different UEs, the PUCCH resources are saved and the power consumption for sending the PUCCH is also saved on the basis of ensuring the PDSCH and PDCCH performance.

TABLE 5 PRI value and PUCCH resource mapping Table

In addition, for the transmission scheme of HARQ-ACK of the multicast PDSCH, the PUCCH Resource may be indicated in such a manner that a PUCCH Resource indicated by one PUCCH Resource Indicator (PRI) may include PUCCH resources located in different uplink serving cells. Corresponding to the same PRI value, PUCCH resources of different UEs may be located in different uplink serving cells, and the PUCCH resource set of each UE is configured independently, as shown in table 6, the PUCCH resource of UE-1 is located in uplink serving cell one, and the PUCCH resource of UE-2 is located in uplink serving cell two.

TABLE 6 PRI values and PUCCH resource mapping tables for different UEs

Fig. 20 shows an exemplary flowchart of a method 2000 of receiving aperiodic channel state information, CSI, report according to an embodiment of the present invention. The method 2000 is implemented at the base station side.

As shown in fig. 20, in step S2010 of the method 2000, downlink control information DCI is transmitted, including a CSI drive field in the DCI.

In step S2020, an aperiodic CSI report for a multicast physical downlink shared channel PDSCH transmitted based on a CSI driver field is received.

In one example, the CSI driver field is for at least one UE, e.g., one UE or one UE group, or multiple UEs or multiple UE groups.

Fig. 21 shows a schematic block diagram of an apparatus 2100 for transmitting according to an embodiment of the present invention. The apparatus 2100 may be implemented on the UE side. The device 2100 may be implemented, for example, to perform the methods described previously with reference to fig. 5, 9, 11, 17, and 18.

As shown in fig. 21, the device 2100 may include a transceiver 2101, a processor 2102, and a memory 2103.

The transceiver 2101 transmits and receives signals. The memory 2103 stores instructions executable by the processor 2102, which when executed by the processor 2102, causes the processor 2102 to perform the methods described above with reference to fig. 5, 9 and 11, 17 and 18.

Fig. 22 shows a schematic block diagram of an apparatus 2200 for receiving according to an embodiment of the present invention. The apparatus 2200 may be implemented on the base station side. For example, the apparatus 2200 may be implemented to perform the methods described above with reference to fig. 12, 19 and 20.

As shown in fig. 22, the device 2200 may include a transceiver 2201, a processor 2202, and a memory 2203.

The transceiver 2201 transmits and receives signals. The memory 2203 stores instructions executable by the processor 2202, which when executed by the processor 2202, cause the processor 2202 to perform the methods described above with reference to fig. 12, 19, and 20.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method for transmitting hybrid automatic repeat request acknowledgement, HARQ-ACK, information, the method comprising:

receiving Downlink Control Information (DCI);

receiving a PDSCH based on the DCI; and

HARQ-ACK information of PDSCH is transmitted in an uplink serving cell or uplink carrier.

2. The method of claim 1, wherein the uplink serving cell or uplink carrier is an uplink serving cell or uplink carrier transmitting a PUCCH.

3. The method of claim 2, wherein the uplink serving cell transmitting the PUCCH is a Pcell or a Scell configured with the PUCCH.

4. The method of claim 1, wherein the uplink serving cell or uplink carrier is a configured uplink serving cell or uplink carrier.

5. The method of any of claims 1 to 3, wherein transmitting the HARQ-ACK information of the PDSCH on an uplink serving cell or uplink carrier comprises:

determining a HARQ-ACK timing relationship;

determining a transmission time unit of a PUCCH based on a HARQ-ACK timing relationship indication time unit and the HARQ-ACK timing relationship;

and transmitting HARQ-ACK information in a transmission time unit of the PUCCH.

6. The method of claim 5, wherein determining a HARQ-ACK timing relationship comprises:

and determining the HARQ-ACK timing relation based on the timing relation indication field in the DCI and the set of HARQ-ACK timing relation.

7. The method of claim 6, wherein the timing relationship indication field is one timing relationship indication field in DCI, wherein the DCI comprises at least 1 timing relationship indication field for indicating at least one HARQ-ACK timing relationship, respectively.

8. The method of claim 6, wherein the set of HARQ-ACK timing relationships is a set corresponding to a first PDSCH.

9. The method of any of claims 1 to 3, wherein transmitting the HARQ-ACK information of the PDSCH on an uplink serving cell or uplink carrier comprises:

receiving a reference HARQ-ACK timing relation indication time unit;

determining a location where k1 is 0 based on the referenced HARQ-ACK timing relationship indication time unit and PDSCH reception time unit;

determining a transmission time unit of the PUCCH based on the referenced HARQ-ACK timing relationship indication time unit and the PUCCH time unit; and

transmitting HARQ-ACK information in a transmission time unit of the PUCCH,

10. The method of claim 9, wherein determining a location where k1 is 0 based on a referenced HARQ-ACK timing relationship indication time unit and PDSCH reception time unit comprises:

when the PDSCH reception time unit is not greater than the reference HARQ-ACK timing relationship indication time unit, a position where k1 is 0 overlaps in time with the reception time unit of the PDSCH; or

When the PDSCH reception time unit is larger than the reference HARQ-ACK timing relationship indication time unit, a position where k1 is 0 overlaps in time with a time period of one of the PDSCH reception time units that is referenced to the HARQ-ACK timing relationship indication time unit length.

11. The method of claim 10, wherein the position where k1 is 0 overlaps in time with a time period in which a HARQ-ACK timing relationship for one reference in a PDSCH reception time unit indicates a time unit length comprises:

the position where k1 is 0 overlaps in time with the time period in which the HARQ-ACK timing relationship for the first reference in the PDSCH reception time unit indicates the time unit length; or

The position where k1 is 0 overlaps in time with the time period in which the HARQ-ACK timing relationship last referenced in the PDSCH reception time unit indicates the time unit length.

12. The method of claim 9, wherein determining a transmission time unit of the PUCCH based on the referenced HARQ-ACK timing relationship indication time unit and PUCCH time unit comprises:

determining a k1 position based on the position where k1 is 0;

when the PUCCH time unit is not less than the reference HARQ-ACK timing relationship indication time unit, the transmission time unit of the PUCCH overlaps in time with the k1 position; or alternatively

When the PUCCH time unit is smaller than the reference HARQ-ACK timing relationship indication time unit, the transmission time unit of the PUCCH overlaps in time with a time period of one PUCCH time unit length in the k1 position.

13. The method of claim 12, wherein the overlapping in time of time segments of one PUCCH time unit length in transmission time unit k1 position of the PUCCH comprises:

the transmission time unit of the PUCCH overlaps in time with the first PUCCH time unit length period in the k1 position or overlaps in time with the last PUCCH time unit length period in the k1 position.

14. An apparatus for transmitting hybrid automatic repeat request acknowledgement, HARQ-ACK, information, comprising:

a transceiver to transmit and receive signals;

a processor; and

a memory having stored therein instructions executable by the processor, the instructions, when executed by the processor, causing the processor to perform the method of any of claims 1-13.