Downlink transmission method, downlink transmission device and storage medium

Abstract

The invention relates to a downlink transmission method, a downlink transmission device and a storage medium. The downlink transmission method is applied to the terminal, and the downlink transmission method comprises the following steps: performing downlink repeated reception of a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on a time slot offset; wherein the time slot offset is the time slot offset of a first time domain position relative to a second time domain position, the second time domain position is the time domain position of the Nth transmission or the last transmission of the PDCCH, the first time domain position is the time domain position of the first transmission of the PDSCH, and the second time domain position is the time domain position of the first transmission of the PDSCH. The Nth time of transmission is any time of PDCCH transmission except the first time of transmission and the last time of transmission of the PDCCH. According to the invention, the repeated transmission of the physical downlink control channel is realized, so that the coverage can be increased, and the coverage loss caused by the reduction of the number of lead antennas can be made up.

Description

[0001] This disclosure is a divisional application of the application with the application number 202080002263.X and the invention creation name of Downlink Transmission Method, Downlink Transmission Device and Storage Medium. Technical Field

[0002] This disclosure relates to the field of communication technologies, and in particular, to a downlink transmission method, a downlink transmission device, and a storage medium. Background Art

[0003] With the continuous development of Internet of Things (IoT) services, such as the popularization of video surveillance, smart home, wearable devices, and industrial sensing and monitoring services. These services usually require a rate of dozens to 100 M, and at the same time have relatively high requirements for latency. Therefore, Machine Type Communication (MTC) and Narrowband Internet of Things (NB-IoT) technologies in related technologies are difficult to meet the requirements. Thus, a new type of terminal is proposed to be redesigned in the 5G New Radio (NR) to cover the requirements of mid-range IoT devices. In the current 3GPP standardization, this new type of terminal is called Reduced capability UE or simply Redcap UE for short.

[0004] Generally, Redcap UE usually needs to meet the following requirements:

[0005] - Low cost and low complexity

[0006] - A certain degree of coverage enhancement

[0007] - Power saving

[0008] Since the current New Radio (NR) is designed for high-rate and low-latency high-end terminals, the current design cannot meet the above requirements of Redcap UE. Therefore, it is necessary to transform the current NR system to meet the requirements of Redcap UE. For example, in order to meet the requirements of low cost and low complexity, the number of receiving antennas of Redcap UE can be restricted. However, the reduction of the number of receiving antennas of Redcap UE will cause coverage loss and affect communication performance. Summary of the Invention

[0009] To overcome the problems existing in the related technologies, this disclosure provides a downlink transmission method, a downlink transmission device, and a storage medium.

[0010] According to the first aspect of the embodiments of the present disclosure, a downlink transmission method is provided, which is applied to a terminal. The downlink transmission method includes: performing downlink repeated reception of a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on a slot offset. Wherein, the slot offset is the slot offset of a first time domain position relative to a second time domain position, the second time domain position is the time domain position of the Nth transmission or the last transmission of the PDCCH, the first time domain position is the time domain position of the first transmission of the PDSCH, and the Nth transmission is any physical downlink control channel transmission other than the first transmission and the last transmission of the PDCCH.

[0011] In an implementation, the performing downlink repeated reception of the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) based on the slot offset includes: determining the time domain position of the first transmission of the PDCCH, and starting from the time domain position of the first transmission of the PDCCH, performing downlink repeated reception of the PDCCH; after the repeated reception of the PDCCH ends, determining the first time domain position based on the second time domain position and the time domain offset; starting from the first time domain position, performing downlink repeated reception of the PDSCH.

[0012] In an implementation, the first time domain position is at the position corresponding to the slot offset after the second time domain position.

[0013] In an implementation, the slot offset is 0 to 3 slots.

[0014] In an implementation, the performing downlink repeated reception of the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) based on the slot offset includes: performing downlink repeated reception of the PDCCH and the PDSCH based on a first parameter, a second parameter, and the slot offset. Wherein, the first parameter indicates the number of repeated transmissions of the PDCCH, and the second parameter indicates the number of repeated transmissions of the PDSCH.

[0015] In an implementation, the time difference between different repeated transmissions of the PDCCH is statically configured by a protocol or by radio resource control (RRC) signaling sent by a network device.

[0016] According to a second aspect of the embodiments of the present disclosure, a downlink transmission method is provided, which is applied to a network device. The downlink transmission method includes: performing downlink repeated transmission of a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on a time slot offset; where the time slot offset is the time slot offset of a first time domain position relative to a second time domain position, the second time domain position is the time domain position of the Nth transmission or the last transmission of the PDCCH, the first time domain position is the time domain position of the first transmission of the PDSCH, and the Nth transmission is any physical downlink control channel transmission other than the first transmission and the last transmission of the PDCCH.

[0017] In an implementation, the performing downlink repeated transmission of the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) based on the time slot offset includes: determining the time domain position of the first transmission of the PDCCH, and starting from the time domain position of the first transmission of the PDCCH, performing downlink repeated transmission of the PDCCH; after the downlink repeated transmission of the PDCCH ends, determining the first time domain position based on the second time domain position and the time domain offset; and starting from the first time domain position, performing downlink repeated transmission of the PDSCH.

[0018] In an implementation, the first time domain position is at a position corresponding to the time slot offset after the second time domain position.

[0019] In an implementation, the time slot offset is from 0 to 3 time slots.

[0020] In an implementation, the performing downlink repeated transmission of the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) based on the time slot offset includes: performing downlink repeated transmission of the PDCCH and the PDSCH based on a first parameter, a second parameter, and the time slot offset; where the first parameter indicates the number of repeated transmissions of the PDCCH, and the second parameter indicates the number of repeated transmissions of the PDSCH.

[0021] In an implementation, the time difference between different PDCCH repeated transmissions is specified by a protocol or statically configured by radio resource control (RRC) signaling sent by a network device.

[0022] According to a third aspect of the embodiments of the present disclosure, a downlink transmission device is provided, which is applied to a terminal. The downlink transmission device includes: a transmission unit configured to perform downlink repeated reception of a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on a slot offset. Wherein, the slot offset is the slot offset of a first time domain position relative to a second time domain position, the second time domain position is the time domain position of the Nth transmission or the last transmission of the PDCCH, the first time domain position is the time domain position of the first transmission of the PDSCH, and the Nth transmission is any one of the physical downlink control channel transmissions except for the first transmission and the last transmission of the PDCCH.

[0023] In one implementation, the determining unit is configured to determine the time domain position of the first transmission of the PDCCH, and start from the time domain position of the first transmission of the PDCCH to perform downlink repeated reception of the PDCCH; after the downlink repeated reception of the PDCCH ends, determine the first time domain position based on the second time domain position and the time domain offset; and start from the first time domain position to perform downlink repeated reception of the PDSCH.

[0024] In one implementation, the first time domain position is at a position corresponding to the slot offset after the second time domain position.

[0025] In one implementation, the slot offset is from 0 to 3 slots.

[0026] In one implementation, the transmission unit is configured to perform downlink repeated reception of the PDCCH and the PDSCH based on a first parameter, a second parameter, and the slot offset. Wherein, the first parameter indicates the number of repeated transmissions of the PDCCH, and the second parameter indicates the number of repeated transmissions of the PDSCH.

[0027] In one implementation, the time difference between different repeated transmissions of the PDCCH is statically configured by a protocol or by radio resource control (RRC) signaling sent by a network device.

[0028] According to a fourth aspect of the embodiments of the present disclosure, a downlink transmission device is provided, which is applied to a network device. The downlink transmission device includes: a sending unit, configured to perform downlink repeated transmission of a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on a time slot offset. Wherein, the time slot offset is the time slot offset of a first time domain position relative to a second time domain position, the second time domain position is the time domain position of the Nth transmission or the last transmission of the PDCCH, the first time domain position is the time domain position of the first transmission of the PDSCH, and the Nth transmission is any physical downlink control channel transmission other than the first transmission and the last transmission of the PDCCH.

[0029] In one implementation, the determining unit is configured to: determine the time domain position of the first transmission of the PDCCH, and start from the time domain position of the first transmission of the PDCCH to perform downlink repeated transmission of the PDCCH; after the repeated transmission of the PDCCH ends, determine the first time domain position based on the second time domain position and the time domain offset; and start from the first time domain position to perform downlink repeated transmission of the PDSCH.

[0030] In one implementation, the first time domain position is at a position corresponding to the time slot offset after the second time domain position.

[0031] In one implementation, the time slot offset is from 0 to 3 time slots.

[0032] In one implementation, the transmission unit is configured to perform downlink repeated transmission of the PDCCH and the PDSCH based on a first parameter, a second parameter, and the time slot offset. Wherein, the first parameter indicates the number of repeated transmissions of the PDCCH, and the second parameter indicates the number of repeated transmissions of the PDSCH.

[0033] In one implementation, the time difference between different repeated transmissions of the PDCCH is specified by a protocol or statically configured by radio resource control (RRC) signaling sent by a network device.

[0034] According to a fifth aspect of the embodiments of the present disclosure, a downlink transmission device is provided, including:

[0035] a processor; and a memory for storing processor-executable instructions;

[0036] Wherein, the processor is configured to: execute the downlink transmission method described in the first aspect or any implementation of the first aspect.

[0037] According to a sixth aspect of the embodiments of the present disclosure, a downlink transmission device is provided, including:

[0038] A processor; a memory for storing processor-executable instructions;

[0039] Wherein, the processor is configured to execute the downlink transmission method described in the second aspect or any one of the embodiments of the second aspect.

[0040] According to the seventh aspect of the embodiments of the present disclosure, there is provided a non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by a processor of a mobile terminal, enabling the mobile terminal to execute the downlink transmission method described in the first aspect or any one of the embodiments of the first aspect.

[0041] According to the eighth aspect of the embodiments of the present disclosure, there is provided a non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by a processor of a network device, enabling the network device to execute the downlink transmission method described in the second aspect or any one of the embodiments of the second aspect.

[0042] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: In the embodiments of the present disclosure, based on the time slot offset of the first time domain position relative to the second time domain position, downlink repeated reception of PDCCH and PDSCH is performed. The first time domain position is the time domain position of the first transmission of PDSCH, and the second time domain position is the time domain position of the Nth transmission or the last transmission of PDCCH. The Nth transmission is any PDCCH transmission other than the first transmission and the last transmission of the PDCCH. Based on the time slot offset, repeated transmission of PDCCH and PDSCH can be realized, which can increase coverage and make up for the coverage loss caused by factors such as the reduction of the number of antennas.

[0043] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0045] Figure 1 is an architecture diagram of a wireless communication system shown according to an exemplary embodiment.

[0046] Figure 2 is a flowchart of a downlink transmission method shown according to an exemplary embodiment.

[0047] Figure 3 is a flowchart of a downlink transmission method shown according to an exemplary embodiment.

[0048] Figure 4It is an example diagram of a pattern for joint transmission of PDCCH and PDSCH shown according to an exemplary embodiment.

[0049] Figure 5A It is a flowchart of a downlink transmission method shown according to an exemplary embodiment.

[0050] Figure 5B It is a flowchart of a downlink transmission method shown according to an exemplary embodiment.

[0051] Figure 6 It is an example diagram of a pattern for joint repeated transmission of PDCCH and PDSCH shown according to an exemplary embodiment.

[0052] Figure 7 It is another example diagram of a pattern for joint repeated transmission of PDCCH and PDSCH shown according to an exemplary embodiment.

[0053] Figure 8 It is yet another example diagram of a pattern for joint repeated transmission of PDCCH and PDSCH shown according to an exemplary embodiment.

[0054] Figure 9 It is a flowchart of a downlink transmission method shown according to an exemplary embodiment of the present disclosure.

[0055] Figure 10 It is a flowchart of a downlink transmission method shown according to an exemplary embodiment of the present disclosure.

[0056] Figure 11 It is a block diagram of a downlink transmission device shown according to an exemplary embodiment.

[0057] Figure 12 It is a block diagram of a downlink transmission device shown according to an exemplary embodiment.

[0058] Figure 13 It is a block diagram of a device for downlink transmission shown according to an exemplary embodiment.

[0059] Figure 14 It is a block diagram of a device for downlink transmission shown according to an exemplary embodiment. Detailed implementation manners

[0060] Exemplary embodiments will be described in detail herein, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0061] The downlink transmission method provided by an embodiment of the present disclosure can be applied to Figure 1 the wireless communication system shown in Figure 1 As shown, the wireless communication system includes a terminal and a network device. Information is transmitted and received between the terminal and the network device through wireless resources.

[0062] It can be understood that Figure 1 the wireless communication system shown in Figure 1 is only for illustrative purposes. The wireless communication system may further include other network devices, such as a core network device, a wireless relay device, and a wireless backhaul device, etc., which are not drawn in

[0063] Furthermore, it can be understood that the wireless communication system of the embodiments of the present disclosure is a network that provides wireless communication functions. The wireless communication system can adopt different communication technologies, such as code division multiple access (CDMA), wideband code division multiple access (WCDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency-division multiple access (OFDMA), single Carrier FDMA (SC-FDMA), Carrier Sense Multiple Access with Collision Avoidance. According to factors such as the capacity, rate, and delay of different networks, the network can be divided into 2G (generation) network, 3G network, 4G network, or future evolved network, such as 5G network. The 5G network can also be referred to as a New Radio (NR). For the convenience of description, the wireless communication network is sometimes simply referred to as the network in the present disclosure.

[0064] Further, the network device involved in the present disclosure may also be referred to as a radio access network device. The radio access network device may be: a base station, an evolved node B (eNB), a home base station, an access point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (TP), or a transmission and reception point (TRP), etc. It may also be a gNB in the NR system, or it may be a component or a part of the device that constitutes the base station. When it is a vehicle-to-everything (V2X) communication system, the network device may also be an in-vehicle device. It should be understood that in the embodiments of the present disclosure, the specific technologies and specific device forms adopted by the network device are not limited.

[0065] Further, the terminal involved in the present disclosure may also be referred to as a terminal device, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc. It is a device that provides voice and / or data connectivity to users. For example, the terminal may be a handheld device with a wireless connection function, an in-vehicle device, etc. Currently, some examples of terminals are: a smart phone, a pocket personal computer (PPC), a palm computer, a personal digital assistant (PDA), a laptop computer, a tablet computer, a wearable device, or an in-vehicle device, etc. In addition, when it is a vehicle-to-everything (V2X) communication system, the terminal device may also be an in-vehicle device. It should be understood that the specific technologies and specific device forms adopted by the terminal in the embodiments of the present disclosure are not limited.

[0066] In the embodiments of the present disclosure, the terminal involved may be a Redcap UE. To meet the requirements of low cost and low complexity of the Redcap UE, the bandwidth of the Redcap UE can be restricted, such as restricted to 10 MHz or 20 MHz, or the number of receiving antennas of the Redcap UE can be restricted. For power saving, a possible optimization direction is to reduce the processing complexity of the user equipment. For example, only the physical downlink control channel (PDCCH) is received in the same time slot, and the device enters a non-awake state at other symbol times in the same time slot. For a certain degree of coverage enhancement, possible methods include performing multiple repeated transmissions on each channel, increasing the aggregation level, and reducing the coding rate, etc. In some embodiments, the non-awake state may be a micro-sleep state or any other non-awake state.

[0067] In the existing NR system, for different frequency bands, ordinary terminal devices may support 4 or 2 receiving antennas. For Redcap UE, to reduce the complexity and cost of the device, the number of receiving antennas may be reduced to 2 or 1 for different frequency bands. For the transmission of Redcap UE, if the existing PDCCH & PDSCH transmission mechanism is used, it will inevitably reduce the coverage range of the network, and the transmission reliability of the control signaling and data of the Redcap UE far from the base station cannot be guaranteed. In the existing NR system, for a single-transmission PDCCH channel, if the number of receiving antennas of the terminal device is reduced from 4 to 2, it will cause a coverage loss of about 2.5 - 4 dB; if the number of receiving antennas of the terminal device is reduced from 2 to 1, it will cause a coverage loss of about 3 - 5 dB; and if the number of receiving antennas of the user equipment is reduced from 4 to 1, it may cause a coverage loss of up to 6 - 9 dB.

[0068] To compensate for the coverage loss caused by the reduction in the number of receiving antennas of the Redcap UE, the present disclosure provides a downlink transmission method, in which the transmission of the PDCCH channel can be enhanced by means of multiple repeated transmissions.

[0069] Figure 2 is a downlink transmission method shown according to an exemplary embodiment, as Figure 2 shown, this downlink transmission method is applied to a terminal and includes the following steps.

[0070] In step S21, based on the time slot offset, perform downlink repeated reception of the physical downlink control channel PDCCH and the physical downlink shared channel PDSCH.

[0071] Wherein, the time slot offset is the time slot offset of the first time domain position relative to the second time domain position. The second time domain position is the time domain position of the Nth transmission or the last transmission of the PDCCH. The first time domain position is the time domain position of the first transmission of the PDSCH. The Nth transmission is any PDCCH transmission other than the first transmission and the last transmission of the PDCCH.

[0072] In some embodiments, the network device may perform downlink repeated transmission of the PDCCH and the PDSCH based on the above time slot offset. The terminal may perform downlink repeated reception of the PDCCH and the PDSCH based on the above time slot offset.

[0073] In some embodiments, the time slot offset may be indicated by a third parameter. The network device may send the third parameter to the terminal, and the third parameter is used to indicate the time slot offset of the first time domain position relative to the second time domain position.

[0074] In one implementation, when the embodiments of the present disclosure perform joint repeated transmission of the PDCCH and the PDSCH, the time slot offset K0 of the PDSCH relative to the PDCCH is designed. Based on the time slot offset K0 of the PDSCH relative to the PDCCH, repeated transmission of the PDCCH and repeated transmission of the PDSCH are performed.

[0075] In some embodiments, the time slot offset K0 may be 0 to 3 time slots.

[0076] In the embodiments of the present disclosure, the time domain offset value may be used to determine the absolute time slot offset of the first time domain position and / or the second time domain position relative to the reference position point.

[0077] In the embodiments of the present disclosure, the time slot offset value may be used to determine the relative time slot offset between the first time domain position and the second time domain position.

[0078] In the embodiments of the present disclosure, the first time domain position may be understood as the time domain position of the first transmission of the PDSCH, that is, the time domain position where the PDSCH starts repeated transmission.

[0079] In some embodiments, the second time domain position may be any time domain position during the repeated transmission of the PDCCH. Among them, the second time domain position may be a fixed time domain position of the repeated transmission of the PDCCH, such as the first transmission time domain position, or the last transmission time domain position, or the time domain position of any transmission other than the first transmission and the last transmission.

[0080] In some embodiments, the second time domain position may be a non-fixed time domain position of the repeated transmission of the PDCCH. For example, the time domain position of any Nth repeated transmission that is not the first transmission time domain position and not the last transmission time domain position.

[0081] In some embodiments, the first time-domain position corresponds to the position of the slot offset after the second time-domain position.

[0082] In some embodiments, based on the slot offset, perform downlink repeated reception of the Physical Downlink Control Channel (PDCCH) and the Physical Downlink Shared Channel (PDSCH), including: determining the time-domain position of the first transmission of the PDCCH, and starting from the time-domain position of the first transmission of the PDCCH, perform downlink repeated reception of the PDCCH; after the repeated reception of the PDCCH ends, determine the first time-domain position based on the second time-domain position and the time-domain offset; starting from the first time-domain position, perform downlink repeated reception of the PDSCH.

[0083] The embodiments of the present disclosure provide a pattern for joint repeated transmission of the PDCCH and the PDSCH, realizing the repeated transmission of the PDCCH and the repeated transmission of the PDSCH.

[0084] In one implementation, the first time-domain position is the time-domain position of the first transmission of the PDSCH, and the second time-domain position is the time-domain position of the last transmission of the PDCCH. That is, at the position corresponding to the slot offset K0 after all the repeated transmissions of the PDCCH channel end, start the transmission of the PDSCH channel, as Figure 6 shown. Figure 6 It is an example diagram of a pattern for joint repeated transmission of a PDCCH and a PDSCH shown according to an exemplary embodiment.

[0085] In one implementation, the first time-domain position is the time-domain position of the first transmission of the PDSCH, and the second time-domain position is the time-domain position of the Nth transmission of the PDCCH. Among them, the Nth transmission is not the last transmission. That is, at the position corresponding to the slot offset K0 after a certain time-domain position during the repeated transmission of the PDCCH channel, start the transmission of the PDSCH channel, which can also be understood as the time-domain position of the first transmission of the PDSCH being during the repeated transmission of the PDCCH.

[0086] In yet another implementation, the time-domain position of the Nth transmission of the PDCCH is the time-domain position of the first transmission of the PDCCH. That is, at the position corresponding to the slot offset K0 after the first transmission of the PDCCH channel, start the transmission of the PDSCH channel, as Figure 7 shown. Figure 7 It is another example diagram of a pattern for joint repeated transmission of a PDCCH and a PDSCH shown according to an exemplary embodiment.

[0087] In another embodiment, the time domain position of the Nth transmission of the PDCCH is when the PDCCH is not the first transmission and not the last transmission. That is, during the non-first and non-last transmissions of the PDCCH channel, at a position corresponding to the time slot offset K0 after a certain time domain position (the time domain resource position is represented by T0), the transmission of the PDSCH channel starts as Figure 8 shown. Figure 8 is an example diagram of a pattern for joint repeated transmission of another PDCCH and PDSCH shown according to an exemplary embodiment.

[0088] In some embodiments, the time difference between different PDCCH repeated transmissions is specified by the protocol or statically configured by radio resource control (RRC) signaling sent by the network device.

[0089] It can be understood that in the embodiments of the present disclosure, the time difference (time gap) between different PDCCH repeated transmissions can be specified as a fixed value by the protocol, or can be statically configured by the network device through high-layer radio resource control (Radio Resource Control, RRC) signaling. The time difference (time gap) between different PDSCH repeated transmissions can be specified as a fixed value by the protocol, or can be statically configured by the network device through high-layer radio resource control (Radio Resource Control, RRC) signaling.

[0090] In some embodiments, based on the time slot offset, downlink repeated reception of the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) is performed, including: based on the first parameter, the second parameter, and the time slot offset, performing downlink repeated reception of the PDCCH and the PDSCH; wherein, the first parameter indicates the number of repeated transmissions of the PDCCH, and the second parameter indicates the number of repeated transmissions of the PDSCH.

[0091] Figure 3 is a flowchart of a downlink transmission method shown according to an exemplary embodiment, as Figure 3 shown, the downlink transmission method is used in a terminal and includes the following steps.

[0092] In step S31, based on the first parameter, the second parameter, and the time slot offset, downlink repeated reception of the PDCCH and the PDSCH is performed.

[0093] In one embodiment, the terminal determines the first parameter, the second parameter, and the time slot offset, that is, the terminal determines the number of retransmissions Nc of the PDCCH channel, the number of retransmissions Ns of the PDSCH channel, and the time slot offset K0 of the first time domain position relative to the second time domain position.

[0094] Among them, the retransmission times Nc of the PDCCH channel and the retransmission times Ns of the PDSCH channel can be indicated by DCI signaling. The time slot offset K0 can reuse the time domain resource indication field in the existing NR DCI signaling, that is, K0 can take values from 0 to 3. In different transmission times, the information bit content carried by the PDCCH is exactly the same.

[0095] In the embodiment of the present disclosure, when the terminal determines the retransmission times Nc of the PDCCH channel, the retransmission times Ns of the PDSCH channel, and the time slot offset K0, downlink transmission can be performed.

[0096] In some embodiments, based on the time slot offset, downlink repeated reception of the physical downlink control channel PDCCH and the physical downlink shared channel PDSCH is performed, including: determining the time domain position of the first transmission of the PDCCH, and starting from the time domain position of the first transmission of the PDCCH, performing downlink repeated reception of the PDCCH; after the repeated reception of the PDCCH ends, determining the first time domain position based on the second time domain position and the time domain offset; starting from the first time domain position, performing downlink repeated reception of the PDSCH.

[0097] In one implementation, determine the time domain position of the first transmission of the PDCCH, and starting from the time domain position of the first transmission of the PDCCH, receive the PDCCH according to the PDCCH retransmission times, and at the first time domain position after the end of the second time domain position, receive the PDSCH according to the PDSCH retransmission times.

[0098] In one implementation, determine the time domain position of the first transmission of the PDCCH, and starting from the time domain position of the first transmission of the PDCCH, receive and cache the PDCCH according to the PDCCH retransmission times, and starting from the time domain position of the first transmission of the PDSCH, receive and cache the PDSCH according to the PDSCH retransmission times.

[0099] Figure 5A It is a flowchart of a downlink transmission method shown according to an exemplary embodiment, as Figure 5A shown, the downlink transmission method is used in a terminal and includes the following steps.

[0100] In step S511, determine a first parameter.

[0101] Among them, the first parameter is used to indicate the PDCCH retransmission times of the first type of terminal.

[0102] In the related art, the terminals for communication can be various types of terminals. In the embodiments of the present disclosure, any two different types of terminals among different types of terminals are referred to as the first type of terminal and the second type of terminal. Among them, the first type of terminal and the second type of terminal can have different capabilities. For example, the capabilities of the terminal can be the transceiver bandwidth, the number of transceiver antennas, the maximum number of bits of the transport block, and the processing time delay, etc. The difference in the capabilities of the terminal can be one or more of the transceiver bandwidth, the number of transceiver antennas, the maximum number of bits of the transport block, and the processing time delay being different. In one example, the first type of terminal can be NR-lite, and the second type of terminal can be an NR terminal.

[0103] In step S512, downlink transmission is performed based on the first parameter.

[0104] In the embodiments of the present disclosure, the first parameter is used to indicate the number of PDCCH retransmission times of the first type of terminal. Therefore, performing downlink transmission based on the first parameter can achieve multiple retransmissions of the PDCCH. Multiple retransmissions of the PDCCH can compensate for the coverage loss caused by factors such as the reduction in the number of receiving antennas and the reduction in system bandwidth of the first type of terminal, thereby achieving coverage enhancement and optimizing communication transmission performance.

[0105] Furthermore, in the embodiments of the present disclosure, coverage enhancement can be achieved by performing multiple retransmissions of the physical downlink shared channel (PDSCH). That is, in the embodiments of the present disclosure, the terminal can determine a second parameter. Among them, the second parameter is used to indicate the number of PDSCH retransmission times of the first type of terminal. The terminal performs retransmission of the PDSCH based on the second parameter.

[0106] It can be understood that the two implementation manners of PDSCH retransmission and PDCCH retransmission can be implemented separately or in combination. In one implementation manner, the embodiments of the present disclosure can perform joint retransmission of the PDCCH and the PDSCH.

[0107] Figure 5B is a flowchart of a downlink transmission method shown according to an exemplary embodiment. As Figure 5B shown, the downlink transmission method is used in a terminal and includes the following steps.

[0108] In step S521, the first parameter and the second parameter are determined.

[0109] Among them, the first parameter is used to indicate the number of PDCCH retransmission times of the first type of terminal, and the second parameter is used to indicate the number of PDSCH retransmission times of the first type of terminal.

[0110] In step S522, PDCCH transmission is performed based on a first parameter, and PDSCH transmission is performed based on a second parameter.

[0111] In the embodiments of the present disclosure, the PDCCH transmission and PDSCH transmission of the terminal refer to the repeated transmission of multiple PDCCHs and the repeated transmission of multiple PDSCHs. Repeated transmission can, in some scenarios, compensate for the coverage loss caused by factors such as the reduction in the number of receiving antennas and the reduction in system bandwidth of the first type of terminal, thereby achieving coverage enhancement and optimizing communication transmission performance.

[0112] In the related art, in the PDCCH and PDSCH transmission mechanisms, the time-domain resource association scheme for the PDSCH channel and the PDCCH channel is as follows: The time-domain resource position of the PDSCH channel is indicated by the downlink control information (DCI) carried by the PDCCH channel. The time-domain resource position of the PDSCH can be offset by 0 to 3 time slots relative to the transmission position of the PDCCH, that is, the PDSCH can be transmitted in the same time slot as the PDCCH or in 1 to 3 time slots after the PDCCH transmission time slot. Among them, for the transmission of the two channels in the same time slot, the transmission of the PDSCH is performed after the PDCCH channel. Among them, Figure 4 is an example diagram of a pattern of joint transmission of PDCCH and PDSCH shown according to an exemplary embodiment. Figure 4 in, the transmission of the PDSCH is performed in 3 time slots after the PDCCH channel.

[0113] Among them, in response to receiving the PDCCH at the current PDCCH time-domain position, enter the non-awake state and maintain the non-awake state until entering the awake state at the next PDCCH time-domain position and receiving the PDCCH.

[0114] In all embodiments of the present disclosure, this non-awake state can be a micro-sleep state or any state other than the awake state.

[0115] In the embodiments of the present disclosure, the terminal decodes the received PDCCH at the even-numbered transmission time-domain positions. In some embodiments, in response to successful decoding of the PDCCH, enter the sleep state and maintain the sleep state until entering the awake state at the first time-domain position and receiving the PDSCH. In some embodiments, in response to failed decoding of the PDCCH, cache the PDCCH.

[0116] Among them, the terminal decodes the received PDSCH at each PDSCH transmission position. In some embodiments, in response to successful PDSCH decoding, it enters the sleep state. In some embodiments, in response to PDSCH decoding failure, the PDSCH is cached.

[0117] In one example, the first type of terminal is a Redcap UE. The Redcap UE determines the time-domain position of the first PDCCH transmission according to the parameter information of the search space set and the control resource set configured by the RRC signaling, and starts receiving the PDCCH at the corresponding time-frequency domain resource position. In each PDCCH transmission time slot, after the Redcap UE receives the PDCCH channel, it can enter the non-awake state until it wakes up at the next PDCCH channel reception time. The Redcap UE can attempt to decode the PDCCH channel at even-numbered positions of the PDCCH channel transmission. If the PDCCH decoding fails, the data is cached for HARQ combination with the next PDCCH to be decoded. If the PDCCH decoding is successful, it enters the sleep state, and no further processing is performed for the remaining PDCCH transmissions until it wakes up at the start time of the PDSCH channel transmission.

[0118] Furthermore, for each PDSCH transmission, the Redcap attempts to decode it. In some embodiments, if the PDSCH decoding fails, the data is cached for HARQ combination with the data of the next PDSCH transmission. In some embodiments, if the PDSCH decoding is successful, it enters the sleep state, and no further processing is performed for the remaining PDSCH transmissions.

[0119] In the embodiments of the present disclosure, the method of starting the PDSCH channel transmission at the position corresponding to the time slot offset K0 after all the PDCCH channel repeated transmissions are completed realizes the serial reception method of the PDCCH and the PDSCH. The serial reception method of the PDCCH and the PDSCH can effectively reduce the power consumption of the Redcap UE and can also effectively reduce the processing complexity of the device. Considering that a relatively high transmission delay may be introduced, this solution can be applied to use cases that are not sensitive to delay requirements, such as video surveillance devices.

[0120] In the embodiments of the present disclosure, the manner in which the terminal determines the first parameter, the second parameter, and the third parameter may be as described in the above embodiments. That is, the terminal determines the retransmission times Nc of the PDCCH channel and the retransmission times Ns of the PDSCH channel, and the slot offset K0 of the first PDSCH transmission relative to the time domain position of the first PDCCH transmission. Among them, the retransmission times Nc of the PDCCH channel and the retransmission times Ns of the PDSCH channel may be indicated by DCI signaling. The slot offset K0 may reuse the time domain resource indication field in the existing NR DCI signaling, that is, K0 may take values from 0 to 3. In different transmission times, the information bit content carried by the PDCCH is exactly the same.

[0121] In the embodiments of the present disclosure, the terminal determines the retransmission times Nc of the PDCCH channel and the retransmission times Ns of the PDSCH channel, and the slot offset K0 of the first PDSCH transmission relative to the time domain position of the first PDCCH transmission, and can perform downlink transmission.

[0122] In one implementation, determine the time domain position of the first PDCCH transmission, and starting from the time domain position of the first PDCCH transmission, receive and cache the PDCCH according to the PDCCH repetition transmission times, and starting from the time domain position of the first PDCCH transmission, receive and cache the PDSCH according to the PDSCH repetition transmission times. Among them, the first type of terminal decodes the received PDCCH at the time domain position of the even-numbered transmission. In some embodiments, in response to successful decoding of the PDCCH, determine the time domain position of the PDSCH transmission and perform decoding of the PDSCH. In some embodiments, in response to a failure in decoding the PDCCH, continue to receive and cache the PDCCH and the PDSCH at the next PDCCH time domain position.

[0123] Further, in some embodiments, in response to successful decoding of the PDCCH, if the PDSCH has been cached at the determined time domain position of the PDSCH transmission, decode the cached PDSCH. In some embodiments, in response to successful decoding of the PDCCH, if the PDSCH is not cached at the determined time domain position of the PDSCH transmission, enter the sleep state and remain in the sleep state until waking up at the next PDSCH time domain position, and receive and decode the PDSCH. Among them, in some embodiments, in response to successful decoding of the PDSCH, enter the sleep state until the time domain transmission of the PDSCH and the PDCCH ends. In some embodiments, in response to a failure in decoding the PDSCH, continue to receive and cache the PDSCH at the next PDSCH time domain position and stop receiving the PDCCH.

[0124] In the embodiments of the present disclosure, the first type of terminal is still taken as an example of a Redcap UE for illustration. The time slot offset K0 still reuses the time domain resource indication field in the existing NR DCI signaling. Therefore, in this embodiment, the PDSCH can start transmission in the 0th to 3rd time slots starting from the PDCCH.

[0125] Among them, the Redcap UE receives and caches the PDCCH and PDSCH simultaneously in the time slot when the PDCCH transmission starts. In each even-numbered transmission time slot, the Redcap UE attempts to decode the PDCCH channel. If the PDCCH decoding fails, the reception of the PDCCH and PDSCH continues. If the PDCCH decoding is successful, the time domain position of the PDSCH channel is found according to the time domain indication field in the PDCCH. If there is already cached PDSCH data at the current moment, that is, the PDSCH transmission has started, the PDSCH channel is attempted to be decoded. If the PDSCH channel decoding fails, the reception of the PDSCH channel continues, and the reception of the PDCCH channel no longer continues. If the PDSCH channel decoding is successful, the Redcap UE enters the sleep state and wakes up until the PDSCH and PDCCH transmissions end. If the PDSCH transmission has not started at the current moment, the Redcap UE enters the sleep state and wakes up to receive and decode the PDSCH channel until the decoding is successful when the PDSCH transmission starts.

[0126] It can be understood that in the embodiments of the present disclosure, the time difference (time gap) between different PDCCH retransmissions can be specified as a fixed value by the protocol or statically configured by the network device through the high-layer radio resource control (RRC) signaling. The time difference (time gap) between different PDSCH retransmissions can be specified as a fixed value by the protocol or statically configured by the network device through the high-layer radio resource control (RRC) signaling.

[0127] In the embodiments of the present disclosure, the repeated transmission of PDSCH starts at the position corresponding to the slot offset K0 after the time domain position of the first transmission of PDCCH, such that the Redcap UE may need to receive and process the PDCCH channel and the PDSCH channel simultaneously in the same slot. Compared with the case where the repeated transmission of PDSCH starts at the position corresponding to the slot offset K0 after the time domain position of the last transmission of PDCCH, the requirement for the device complexity is relatively high. However, compared with the implementation where the repeated transmission of PDSCH starts at the position corresponding to the slot offset K0 after the time domain position of the last transmission of PDCCH, the implementation where the repeated transmission of PDSCH starts at the position corresponding to the slot offset K0 after the time domain position of the last transmission of PDCCH has a lower delay overhead. In addition, in a scenario where the current channel quality is good, if the Redcap UE successfully decodes the PDSCH before the end of the repeated transmission of PDCCH, the device power consumption can be effectively reduced. The implementation where the repeated transmission of PDSCH starts at the position corresponding to the slot offset K0 after the time domain position of the first transmission of PDCCH is applicable to use cases with high delay requirements, such as scenarios of safety related sensors, etc.

[0128] In the embodiments of the present disclosure, in the scenario where the time domain position of the Nth transmission of PDCCH is neither the first transmission nor the last transmission of PDCCH, in addition to determining the retransmission times Nc of the PDCCH channel, the retransmission times Ns of the PDSCH channel, and the slot offset K0 of the first PDSCH transmission relative to the time domain position of the Nth transmission of PDCCH, it is also necessary to determine the time domain position T0 of the Nth transmission of PDCCH. That is, in the embodiments of the present disclosure, the terminal also needs to determine a fourth parameter, and the fourth parameter is used to indicate the time domain position T0 of the Nth transmission of PDCCH.

[0129] In one implementation, in order to further reduce the signaling overhead, the fourth parameter and the third parameter may be fixed values determined based on the protocol and / or indicated based on the DCI signaling.

[0130] In one implementation, when the third parameter is a fixed value determined based on the protocol and the fourth parameter is indicated based on the downlink control signaling, the time domain position T0 of the Nth transmission of PDCCH is determined based on the PDCCH transmission times and the T0 index of the time domain position of the Nth transmission of PDCCH. In an example, the time domain position T0 of the Nth transmission of PDCCH is: Nc / 4*(T0 index value + 1).

[0131] In the embodiments of the present disclosure, the time-domain position T0 of the Nth transmission of the PDCCH can be indicated by a first information field included in the DCI signaling. That is, the first information field is used to indicate the index of the time-domain position T0 of the Nth transmission of the PDCCH. In the embodiments of the present disclosure, in order to reduce signaling overhead, when the slot offset K0 of the first PDSCH transmission relative to the time-domain position of the Nth transmission of the PDCCH is a fixed value determined based on the protocol, the first information field indicating the index of the time-domain position T0 of the Nth transmission of the PDCCH can reuse the information field in the DCI signaling originally used to indicate the slot offset K0.

[0132] In the embodiments of the present disclosure, the position of the time-domain position T0 of the Nth transmission of the PDCCH can be one-fourth of Nc, two-fourths of Nc, three-fourths of Nc, and Nc. For example, when the PDCCH is retransmitted 8 times, the optional positions of T0 include: the second PDCCH transmission, the fourth PDCCH transmission, the sixth PDCCH, and the eighth PDCCH transmission.

[0133] In the embodiments of the present disclosure, still taking the first type of terminal as a Redcap UE as an example for illustration. Among them, when the Redcap UE performs repeated transmissions of the PDCCH and the PDSCH, the retransmission times Nc of the PDCCH channel, the retransmission times Ns of the PDSCH channel, the slot offset K0 of the first PDSCH transmission relative to the time-domain position of the Nth transmission of the PDCCH, and the time-domain position T0 of the Nth transmission of the PDCCH are determined. Among them, in order to further reduce signaling overhead, the time-domain position T0 and the slot offset K0 of the Nth transmission of the PDCCH can be specified as fixed values by the protocol or can be indicated by the DCI signaling. When the slot offset K0 is specified as a fixed value by the protocol, the slot offset bits (2 bits) in the time-domain resource indication field of the DCI signaling can be reused to carry the index value of the time-domain position T0 of the Nth transmission of the PDCCH, so as to further reduce signaling overhead. Among them, the index of the time-domain position T0 of the Nth transmission of the PDCCH has four values: 0 to 3, and the actual position of the time-domain position T0 of the Nth transmission of the PDCCH is Nc / 4*(T0 index value + 1). To increase scheduling flexibility, the time-domain position T0 and the slot offset K0 of the Nth transmission of the PDCCH are not simultaneously specified as fixed values by the protocol.

[0134] In the scenario where the time domain position of the Nth transmission of the PDCCH is a non-first and non-last transmission of the PDCCH, the value of T0, which is the time domain position of the Nth transmission of the PDCCH, can be indicated by the network device. In a relatively fixed reference time domain position (the repeated transmission of the PDSCH starts at the position corresponding to the time slot offset K0 after the time domain position of the first transmission of the PDCCH, or the repeated transmission of the PDSCH starts at the position corresponding to the time slot offset K0 after the time domain position of the last transmission of the PDCCH), the flexibility of network device scheduling is increased. In addition, compared with the implementation mode where the repeated transmission of the PDSCH starts at the position corresponding to the time slot offset K0 after the time domain position of the last transmission of the PDCCH, the transmission delay can be effectively reduced.

[0135] In the embodiments of the present disclosure, the terminal determines the retransmission times Nc of the PDCCH channel, the retransmission times Ns of the PDSCH channel, the time slot offset K0 of the first PDSCH transmission relative to the time domain position of the Nth transmission of the PDCCH, and the time domain position T0 of the Nth transmission of the PDCCH, and can perform downlink transmission.

[0136] In one implementation, determine the time domain position of the first transmission of the PDCCH, start receiving and caching the PDCCH from the time domain position of the first transmission of the PDCCH according to the PDCCH retransmission times, and start receiving and caching the PDSCH from the time domain position of the Nth transmission of the PDCCH according to the PDSCH retransmission times. Among them, the first type of terminal decodes the received PDCCH at the time domain positions of even-numbered transmissions. In response to successful decoding of the PDCCH, determine the transmission time domain position of the PDSCH and perform decoding of the PDSCH. In response to failed decoding of the PDCCH, continue to receive and cache the PDCCH and PDSCH at the next PDCCH time domain position.

[0137] Furthermore, in response to successful decoding of the PDCCH, if the PDSCH has been cached at the determined transmission time domain position of the PDSCH, decode the cached PDSCH. In response to successful decoding of the PDCCH, if the PDSCH has not been cached at the determined transmission time domain position of the PDSCH, enter the sleep state and remain in the sleep state until waking up at the next PDSCH time domain position, and receive and decode the PDSCH. Among them, in response to successful decoding of the PDSCH, enter the sleep state until the time domain transmissions of the PDSCH and PDCCH end. In response to failed decoding of the PDSCH, continue to receive and cache the PDSCH at the next PDSCH time domain position and stop receiving the PDCCH.

[0138] It can be understood that in the embodiments of the present disclosure, the time difference (time gap) between different PDCCH retransmissions can be specified as a fixed value by the protocol, or can be statically configured by the network device through high-layer Radio Resource Control (RRC) signaling. The time difference (time gap) between different PDSCH retransmissions can be specified as a fixed value by the protocol, or can be statically configured by the network device through high-layer Radio Resource Control (RRC) signaling.

[0139] The downlink transmission method for PDCCH retransmission and / or PDSCH retransmission provided by the embodiments of the present disclosure can be applied to a network device.

[0140] Figure 9 It is a flowchart of a downlink transmission method shown according to an exemplary embodiment of the present disclosure. As Figure 9 shown, the downlink transmission method is applied to a network device, and the downlink transmission method includes the following steps.

[0141] In step S91, based on the slot offset, perform downlink retransmission of the Physical Downlink Control Channel (PDCCH) and the Physical Downlink Shared Channel (PDSCH).

[0142] Figure 10 It is a flowchart of a downlink transmission method shown according to an exemplary embodiment of the present disclosure. As Figure 10 shown, the downlink transmission method is applied to a network device, and the downlink transmission method includes the following steps.

[0143] In step S101, based on the first parameter, the second parameter, and the slot offset, perform downlink retransmission of the PDCCH and the PDSCH.

[0144] Among them, the first parameter is used to indicate the number of PDCCH retransmissions of the first type of terminal. The second parameter is used to indicate the number of PDSCH retransmissions of the first type of terminal.

[0145] In one implementation, the first time domain position is the time domain position of the first transmission of the PDSCH, and the second time domain position is the time domain position of the last transmission of the PDCCH.

[0146] In one implementation, the first time domain position is the time domain position of the first transmission of the PDSCH, and the second time domain position is the time domain position of the Nth transmission of the PDCCH, and the Nth transmission is not the last transmission.

[0147] In one implementation, the time domain position of the Nth transmission of the PDCCH is the time domain position of the first transmission of the PDCCH.

[0148] In one implementation, the time domain position of the Nth transmission of the PDCCH is a non-first and non-last transmission of the PDCCH.

[0149] Furthermore, in the embodiments of the present disclosure, the network device may further determine a fourth parameter, which is used to indicate the time domain position of the Nth transmission of the PDCCH.

[0150] In one implementation, the fourth parameter and the third parameter are fixed values determined based on the protocol and / or indicated by downlink control signaling.

[0151] In one implementation, the third parameter is a fixed value determined based on the protocol, and the fourth parameter is indicated by downlink control signaling; the time domain position of the Nth transmission of the PDCCH is determined based on the PDCCH repetition count and the time domain position index of the Nth transmission of the PDCCH.

[0152] In one implementation, the downlink control signaling includes a first information field, which is used to indicate the time domain position index of the Nth transmission of the PDCCH.

[0153] It can be understood that the first type of terminal involved in the above embodiments of the present disclosure may be NR-lite.

[0154] Furthermore, it can be understood that for the implementation process of the network device to implement the downlink transmission method in the embodiments of the present disclosure, reference may be made to the implementation process of the above terminal to implement downlink transmission. The embodiments of the present disclosure will not be elaborated herein.

[0155] Furthermore, it can be understood that the downlink transmission method provided by the embodiments of the present disclosure can also be applied to the process of the network device and the terminal interacting to communicate based on the threshold value of communication parameters. The specific implementation process can refer to the implementation process of the terminal side or the network side involved in the above embodiments to implement communication processing. The embodiments of the present disclosure will not be elaborated herein.

[0156] It should be noted that those skilled in the art can understand that the various implementation manners / embodiments involved in the embodiments of the present disclosure can be used in combination with the foregoing embodiments or independently. Whether used alone or in combination with the foregoing embodiments, their implementation principles are similar. In the embodiments of the present disclosure, some embodiments are described in the implementation manners of being used together; of course, those skilled in the art can understand that such illustrative examples do not limit the embodiments of the present disclosure.

[0157] Based on the same concept, the embodiments of the present disclosure further provide a downlink transmission device.

[0158] It can be understood that, in order to implement the above functions, the downlink transmission device provided in the embodiments of the present disclosure includes the corresponding hardware structures and / or software modules for executing each function. Combining the units and algorithm steps of the various examples disclosed in the embodiments of the present disclosure, the embodiments of the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the manner of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the technical solutions of the embodiments of the present disclosure.

[0159] Figure 11 is a block diagram of a downlink transmission device shown according to an exemplary embodiment. Referring to Figure 11 , the downlink transmission device 100 is applied to a terminal, and the downlink transmission device 100 includes at least one of a determination unit 101 and a transmission unit 102.

[0160] Among them, the transmission unit 102 is used to perform downlink repeated reception of the physical downlink control channel PDCCH and the physical downlink shared channel PDSCH based on the time slot offset.

[0161] In one implementation, the determination unit 101 is used to determine the time domain position of the first transmission of the PDCCH, and start from the time domain position of the first transmission of the PDCCH to perform downlink repeated reception of the PDCCH; after the downlink repeated reception of the PDCCH ends, determine the first time domain position based on the second time domain position and the time slot offset; start from the first time domain position to perform downlink repeated reception of the PDSCH.

[0162] In one implementation, the transmission unit 102 is used to perform downlink repeated reception of the PDCCH and the PDSCH based on the first parameter, the second parameter, and the time slot offset.

[0163] In one implementation, the determination unit 101 is used to determine a first parameter, and the first parameter is used to indicate the number of repeated transmissions of the PDCCH of the first type of terminal. The transmission unit 102 is used to perform downlink transmission based on the first parameter.

[0164] In one implementation, the determination unit 101 is further used to determine a second parameter, and the second parameter is used to indicate the number of repeated transmissions of the PDSCH of the first type of terminal.

[0165] In one implementation, the determination unit 101 is further used to: determine a third parameter, where the third parameter is used to indicate the time slot offset of the first time domain position relative to the second time domain position, the first time domain position is the time domain position of PDSCH transmission, and the second time domain position is the time domain position of PDCCH transmission.

[0166] In one implementation, the first time-domain position is the time-domain position of the first transmission of the PDSCH, and the second time-domain position is the time-domain position of the last transmission of the PDCCH.

[0167] In one implementation, the transmission unit 102 performs downlink transmission based on the first parameter in the following manner:

[0168] Determine the time-domain position of the first transmission of the PDCCH, start receiving the PDCCH from the time-domain position of the first transmission of the PDCCH, receive the PDCCH according to the PDCCH repetition transmission times, and receive the PDSCH according to the PDSCH repetition transmission times at the first time-domain position after the end of the second time-domain position.

[0169] In one implementation, the transmission unit 102 receives the PDCCH according to the PDCCH repetition transmission times in the following manner: In response to receiving the PDCCH at the current PDCCH time-domain position, enter the non-awake state and maintain the non-awake state until entering the awake state at the next PDCCH time-domain position and receive the PDCCH.

[0170] In one implementation, the transmission unit 102 performs downlink transmission based on the first parameter in the following manner:

[0171] Decode the received PDCCH at the even-numbered transmission time-domain positions. In response to successful decoding of the PDCCH, enter the sleep state and maintain the sleep state until entering the awake state at the first time-domain position and receive the PDSCH. In response to failed decoding of the PDCCH, cache the PDCCH.

[0172] In one implementation, the transmission unit 102 receives the PDSCH in the following manner:

[0173] Decode the received PDSCH at each PDSCH transmission position. In response to successful decoding of the PDSCH, enter the sleep state. In response to failed decoding of the PDSCH, cache the PDSCH.

[0174] In one implementation, the first time-domain position is the time-domain position of the first transmission of the PDSCH, and the second time-domain position is the time-domain position of the Nth transmission of the PDCCH, and the Nth transmission is not the last transmission.

[0175] In one implementation, the transmission unit 102 receives the PDCCH based on the first parameter in the following manner:

[0176] Determine the time domain position of the first transmission of the PDCCH, and starting from the time domain position of the first transmission of the PDCCH, receive and cache the PDCCH according to the PDCCH repetition transmission times, and starting from the time domain position of the Nth transmission of the PDCCH, receive and cache the PDSCH according to the PDSCH repetition transmission times.

[0177] In one implementation, the transmission unit 102 receives the PDCCH according to the PDCCH repetition transmission times and receives the PDSCH according to the PDSCH repetition transmission times in the following manner:

[0178] Decode the received PDCCH at the even-numbered transmission time domain positions. In response to successful decoding of the PDCCH, determine the transmission time domain position of the PDSCH and perform decoding of the PDSCH. In response to failed decoding of the PDCCH, continue to receive and cache the PDCCH and the PDSCH at the next PDCCH time domain position.

[0179] In one implementation, the transmission unit 102 decodes the PDSCH in the following manner:

[0180] If the PDSCH has been cached at the determined transmission time domain position of the PDSCH, decode the cached PDSCH. If the PDSCH has not been cached at the determined transmission time domain position of the PDSCH, enter the sleep state and remain in the sleep state until waking up at the next PDSCH time domain position, and receive and decode the PDSCH.

[0181] In one implementation, the transmission unit 102 decodes the cached PDSCH in the following manner:

[0182] In response to successful decoding of the PDSCH, enter the sleep state until the time domain transmissions of the PDSCH and the PDCCH are completed. In response to failed decoding of the PDSCH, continue to receive and cache the PDSCH at the next PDSCH time domain position and stop receiving the PDCCH.

[0183] In one implementation, the time domain position of the Nth transmission of the PDCCH is the time domain position of the first transmission of the PDCCH.

[0184] In one implementation, the time domain position of the Nth transmission of the PDCCH is a non-first transmission and a non-last transmission of the PDCCH.

[0185] In one implementation, the determination unit 101 is further configured to: determine a fourth parameter, where the fourth parameter is used to indicate the time domain position of the Nth transmission of the PDCCH.

[0186] In one implementation, the fourth parameter and the third parameter are fixed values determined based on the protocol and / or indicated based on the downlink control signaling.

[0187] In one implementation, the third parameter is a fixed value determined based on the protocol, and the fourth parameter is indicated based on the downlink control signaling. The time domain position of the Nth transmission of the PDCCH is determined based on the PDCCH repetition transmission times and the time domain position index of the Nth transmission of the PDCCH.

[0188] In one implementation, the downlink control signaling includes a first information field for indicating the time domain position index of the Nth transmission of the PDCCH.

[0189] Figure 12 is a block diagram of a downlink transmission device shown according to an exemplary embodiment. Refer to Figure 12 , the downlink transmission device 200 is applied to a network device, and the downlink transmission device 200 includes at least one of a determination unit 201 and a transmission unit 202.

[0190] Among them, the transmission unit 202 is configured to perform downlink repeated transmission of the physical downlink control channel PDCCH and the physical downlink shared channel PDSCH based on the time slot offset.

[0191] In one implementation, the determination unit 201 is configured to determine the time domain position of the first transmission of the PDCCH, and start the downlink repeated transmission of the PDCCH from the time domain position of the first transmission of the PDCCH; after the repeated reception of the PDCCH ends, determine the first time domain position based on the second time domain position and the time domain offset; start the downlink repeated transmission of the PDSCH from the first time domain position.

[0192] In one implementation, the transmission unit 202 is configured to perform downlink repeated reception of the PDCCH and the PDSCH based on the first parameter, the second parameter, and the time slot offset.

[0193] In one implementation, the determination unit 201 is configured to determine a first parameter for indicating the physical downlink control channel repetition transmission times of the first type of terminal. The transmission unit 202 is configured to transmit the first parameter.

[0194] In one implementation, the determination unit 201 is further configured to: determine a second parameter for indicating the PDSCH repetition transmission times of the first type of terminal. The transmission unit 202 is further configured to: transmit the second parameter.

[0195] In one implementation, the determination unit 201 is further configured to: determine a third parameter for indicating the time slot offset of the first time domain position relative to the second time domain position, where the first time domain position is the time domain position of the PDSCH transmission, and the second time domain position is the time domain position of the PDCCH transmission.

[0196] In one implementation, the first time-domain position is the time-domain position of the first transmission of the PDSCH, and the second time-domain position is the time-domain position of the last transmission of the PDCCH.

[0197] In one implementation, the first time-domain position is the time-domain position of the first transmission of the PDSCH, and the second time-domain position is the time-domain position of the Nth transmission of the PDCCH, where the Nth transmission is not the last transmission.

[0198] In one implementation, the time-domain position of the Nth transmission of the PDCCH is the time-domain position of the first transmission of the PDCCH.

[0199] In one implementation, the time-domain position of the Nth transmission of the PDCCH is neither the first transmission nor the last transmission of the PDCCH.

[0200] In one implementation, the determining unit 201 is further configured to: determine a fourth parameter, where the fourth parameter is used to indicate the time-domain position of the Nth transmission of the PDCCH.

[0201] In one implementation, the fourth parameter and the third parameter are fixed values determined based on the protocol, and / or indicated based on the downlink control signaling.

[0202] In one implementation, the third parameter is a fixed value determined based on the protocol, and the fourth parameter is indicated based on the downlink control signaling. The time-domain position of the Nth transmission of the PDCCH is determined based on the PDCCH repetition times and the time-domain position index of the Nth transmission of the PDCCH.

[0203] In one implementation, the downlink control signaling includes a first information field, where the first information field is used to indicate the time-domain position index of the Nth transmission of the PDCCH.

[0204] Regarding the device in the above embodiments, the specific manners in which each module performs operations have been described in detail in the embodiments related to the method, and will not be elaborated here.

[0205] Figure 13 It is a block diagram of a device for downlink transmission shown according to an exemplary embodiment. For example, the device 300 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0206] Referring to Figure 13 , the device 300 may include one or more of the following components: a processing component 302, a memory 304, a power component 306, a multimedia component 308, an audio component 310, an input / output (I / O) interface 312, a sensor component 314, and a communication component 316.

[0207] The processing component 302 generally controls the overall operation of the device 300, such as operations associated with display, telephone calls, data communication, camera operations, and recording operations. The processing component 302 may include one or more processors 320 to execute instructions to complete all or part of the steps of the above-described methods. In addition, the processing component 302 may include one or more modules to facilitate the interaction between the processing component 302 and other components. For example, the processing component 302 may include a multimedia module to facilitate the interaction between the multimedia component 308 and the processing component 302.

[0208] The memory 304 is configured to store various types of data to support the operation of the device 300. Examples of such data include instructions for any application or method operating on the device 300, contact data, phone book data, messages, pictures, videos, and the like. The memory 304 may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, a magnetic disk, or an optical disk.

[0209] The power component 306 provides power to the various components of the device 300. The power component 306 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the device 300.

[0210] The multimedia component 308 includes a screen that provides an output interface between the device 300 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of the touch or swipe actions but also detect the duration and pressure associated with the touch or swipe operations. In some embodiments, the multimedia component 308 includes a front camera and / or a rear camera. When the device 300 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera may receive external multimedia data. Each of the front camera and the rear camera may be a fixed optical lens system or have a focal length and optical zoom capabilities.

[0211] The audio component 310 is configured to output and / or input audio signals. For example, the audio component 310 includes a microphone (MIC) that is configured to receive external audio signals when the device 300 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals can be further stored in the memory 304 or transmitted via the communication component 316. In some embodiments, the audio component 310 further includes a speaker for outputting audio signals.

[0212] The I / O interface 312 provides an interface between the processing component 302 and peripheral interface modules, and the peripheral interface modules may be a keyboard, a click wheel, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a power button, and a lock button.

[0213] The sensor component 314 includes one or more sensors for providing an assessment of various aspects of the state of the device 300. For example, the sensor component 314 can detect the on / off state of the device 300, the relative positioning of components, such as the display and keypad of the device 300, the sensor component 314 can also detect a change in the position of the device 300 or a component of the device 300, the presence or absence of user contact with the device 300, the orientation or acceleration / deceleration of the device 300, and the temperature change of the device 300. The sensor component 314 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor component 314 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 314 may further include an acceleration sensor, a gyro sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0214] The communication component 316 is configured to facilitate communication between the device 300 and other devices in a wired or wireless manner. The device 300 can access a wireless network based on communication standards, such as WiFi, 2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 316 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 316 further includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0215] In an exemplary embodiment, the apparatus 300 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above method.

[0216] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions, such as a memory 304 including instructions, is also provided. The above instructions may be executed by a processor 320 of the apparatus 300 to complete the above method. For example, the non-transitory computer-readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0217] Figure 14 FIG. is a block diagram of an apparatus for downlink transmission according to an exemplary embodiment. For example, the apparatus 400 may be provided as a server. Referring to Figure 14 , the apparatus 400 includes a processing component 422, which further includes one or more processors, and memory resources represented by a memory 432 for storing instructions executable by the processing component 422, such as application programs. The application programs stored in the memory 432 may include one or more modules each corresponding to a set of instructions. In addition, the processing component 422 is configured to execute instructions to perform the above method.

[0218] The apparatus 400 may also include a power component 426 configured to perform power management of the apparatus 400, a wired or wireless network interface 450 configured to connect the apparatus 400 to a network, and an input / output (I / O) interface 458. The apparatus 400 may operate based on an operating system stored in the memory 432, such as Windows ServerTM, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, or the like.

[0219] In an exemplary embodiment, the apparatus 400 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above method.

[0220] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 432 including instructions, and the above instructions can be executed by a processing component 422 of the device 400 to complete the above method. For example, the non-transitory computer-readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0221] It can be further understood that in the present disclosure, "a plurality of" means two or more, and other quantifiers are similar thereto. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. The singular forms of "a", "the", and "said" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0222] It can be further understood that terms such as "first", "second", etc. are used to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other and do not represent a specific order or importance. In fact, expressions such as "first" and "second" can be used interchangeably completely. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0223] It can be further understood that although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring these operations to be performed in the specific order shown or in a serial order, or requiring all the operations shown to obtain the desired result. In a specific environment, multi-tasking and parallel processing may be advantageous.

[0224] The embodiments of the present disclosure also propose a downlink transmission method applied to a network device, and the method includes:

[0225] Determine transmission parameters, where the transmission parameters include a first parameter for indicating the transmission parameters of the physical downlink control channel of the first type of terminal and / or a second parameter for indicating the transmission parameters of the physical downlink shared channel of the first type of terminal;

[0226] Perform downlink transmission based on the transmission parameters.

[0227] The embodiments of the present disclosure also propose a downlink transmission method applied to a network device, and the method includes:

[0228] Determine transmission parameters, where the transmission parameters include a relative slot offset used to indicate the relative time-domain positions of a first time-domain position and a second time-domain position, the first time-domain position being the time-domain position for transmitting the physical downlink shared channel, and the second time-domain position being the time-domain position for transmitting the physical downlink control channel.

[0229] An embodiment of the present disclosure also provides a downlink transmission method applied to a network device, and the method includes:

[0230] Determine transmission parameters, where the transmission parameters include an absolute slot offset used to indicate the absolute time-domain positions of a first time-domain position and / or a second time-domain position relative to a reference position point, the first time-domain position being the time-domain position for transmitting the physical downlink shared channel, and the second time-domain position being the time-domain position for transmitting the physical downlink control channel.

[0231] An embodiment of the present disclosure also provides a downlink transmission method applied to a network device, and the method includes:

[0232] Determine the transmission time-domain position of a physical downlink control channel once;

[0233] Starting from the transmission time-domain position of the physical downlink control channel, receive the physical downlink control channel according to the number of repetitions of the physical downlink control channel transmission; at the first time-domain position after the end of the second time-domain position, receive the physical downlink shared channel according to the number of repetitions of the physical downlink shared channel transmission.

[0234] In any of the above embodiments, the network device is any one of the following devices: a base station, a core network device, a user terminal, etc.

[0235] In any of the above embodiments, a first parameter is used to indicate the number of repetitions of the physical downlink control channel transmission of a first type of terminal. In any of the above embodiments, a second parameter is used to indicate the number of repetitions of the physical downlink shared channel transmission of a first type of terminal.

[0236] In any of the above embodiments, the first time-domain position is the time-domain position of the first transmission of the physical downlink shared channel, and the second time-domain position is the time-domain position of the last transmission of the physical downlink control channel.

[0237] In any of the above embodiments, receiving the physical downlink control channel according to the number of repetitions of the physical downlink control channel transmission includes:

[0238] In response to receiving the physical downlink control channel at the time-domain position of the physical downlink control channel (PDCCH), enter a non-awake state, and maintain the non-awake state until entering the awake state at the next time-domain position of the physical downlink control channel (PDCCH) and receiving the physical downlink control channel (PDCCH).

[0239] In any of the above embodiments, the non-awake state may be a micro-sleep state.

[0240] In any of the above embodiments, the downlink transmission based on the first parameter further includes:

[0241] Decode the received physical downlink control channel at the time domain position of an even-numbered transmission; perform a response operation according to the decoding of the physical downlink control channel;

[0242] Wherein, performing a response operation according to the decoding of the physical downlink control channel includes:

[0243] In response to successful decoding of the physical downlink control channel, enter the sleep state and maintain the sleep state until entering the awake state at the first time domain position and receive the physical downlink shared channel;

[0244] Or

[0245] In response to failure of decoding the physical downlink control channel, cache the physical downlink control channel.

[0246] In any of the above embodiments, the receiving of the physical downlink shared channel includes:

[0247] Decode the received physical downlink shared channel at the time domain position of one physical downlink shared channel transmission; perform a response operation according to the decoding of the physical downlink control channel;

[0248] Wherein, performing a response operation according to the decoding of the physical downlink control channel includes:

[0249] In response to successful decoding of the physical downlink shared channel, enter the sleep state;

[0250] Or

[0251] In response to failure of decoding the physical downlink shared channel, cache the physical downlink shared channel.

[0252] In any of the above embodiments, the first time domain position is the time domain position of the first transmission of the physical downlink shared channel, the second time domain position is the time domain position of the Nth transmission of the physical downlink control channel, and the Nth transmission is not the last transmission.

[0253] The receiving of the physical downlink control channel based on the first parameter includes:

[0254] Determine the time domain position of one transmission of the physical downlink control channel;

[0255] Starting from the time domain position of the first transmission of the physical downlink control channel, receive and buffer the physical downlink control channel according to the number of repetitions of the physical downlink control channel transmission; starting from the time domain position of the Nth transmission of the physical downlink control channel, receive and buffer the physical downlink shared channel according to the number of repetitions of the physical downlink shared channel transmission.

[0256] In any of the above embodiments, the time domain position of the first transmission of the physical downlink control channel is the time domain position of the first transmission of the physical downlink control channel.

[0257] In any of the above embodiments, receiving the physical downlink control channel according to the number of repetitions of the physical downlink control channel transmission and receiving the physical downlink shared channel according to the number of repetitions of the physical downlink shared channel transmission includes:

[0258] Decode the received physical downlink control channel at the time domain position of an even-numbered transmission;

[0259] In response to successful decoding of the physical downlink control channel, determine the time domain position of the transmission of the physical downlink shared channel and perform decoding of the physical downlink shared channel;

[0260] In response to failure of decoding of the physical downlink control channel, continue to receive and buffer the physical downlink control channel and the physical downlink shared channel at the next time domain position of the physical downlink control channel.

[0261] In any of the above embodiments, performing decoding of the physical downlink shared channel includes:

[0262] In response to the physical downlink shared channel being cached at the determined time domain position of the transmission of the physical downlink shared channel, decode the cached physical downlink shared channel.

[0263] In any of the above embodiments, performing decoding of the physical downlink shared channel includes:

[0264] In response to the physical downlink shared channel not being cached at the determined time domain position of the transmission of the physical downlink shared channel, enter the sleep state and remain in the sleep state until waking up at the next time domain position of the physical downlink shared channel, and receive and decode the physical downlink shared channel.

[0265] In any of the above embodiments, decoding the cached physical downlink shared channel includes:

[0266] In response to successful decoding of the physical downlink shared channel, enter the sleep state until the time domain transmission of the physical downlink shared channel and the physical downlink control channel ends.

[0267] In any of the above embodiments, decoding the cached physical downlink shared channel includes:

[0268] In response to a failure in decoding the physical downlink shared channel, continue to receive and cache the physical downlink shared channel at the time domain position of the next physical downlink shared channel, and stop receiving the physical downlink control channel.

[0269] In any of the above embodiments, the time domain position of the Nth transmission of the physical downlink control channel is the time domain position of the first transmission of the physical downlink control channel.

[0270] In any of the above embodiments, the time domain position of the Nth transmission of the physical downlink control channel is a non-first transmission and a non-last transmission of the physical downlink control channel.

[0271] In any of the above embodiments, the method further includes: determining a fourth parameter, where the fourth parameter is used to indicate the time domain position of the Nth transmission of the physical downlink control channel.

[0272] In any of the above embodiments, the fourth parameter and / or the third parameter is a fixed value determined based on a protocol.

[0273] In any of the above embodiments, the fourth parameter and / or the third parameter is determined based on downlink control signaling.

[0274] In any of the above embodiments, the third parameter is a fixed value determined based on a protocol, the fourth parameter is determined based on downlink control signaling; and the time domain position of the Nth transmission of the physical downlink control channel is determined based on the physical downlink control channel repetition number and the time domain position index of the Nth transmission of the physical downlink control channel.

[0275] In any of the above embodiments, the downlink control signaling includes a first information field, where the first information field is used to indicate the time domain position index of the Nth transmission of the physical downlink control channel.

[0276] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not disclosed by the present disclosure. The specification and embodiments are only considered exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0277] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A downlink transmission method, characterized in that, Applied to a terminal, the downlink transmission method includes: Based on the slot offset, perform downlink repeated reception of the Physical Downlink Control Channel (PDCCH) and the Physical Downlink Shared Channel (PDSCH); Wherein, the slot offset is the slot offset of a first time domain position relative to a second time domain position, the second time domain position is the time domain position of the Nth transmission or the last transmission of the PDCCH, the first time domain position is the time domain position of the first transmission of the PDSCH, and the Nth transmission is any transmission of the PDCCH other than the first transmission and the last transmission of the PDCCH.

2. The downlink transmission method according to claim 1, wherein The performing downlink repeated reception of the Physical Downlink Control Channel (PDCCH) and the Physical Downlink Shared Channel (PDSCH) based on the slot offset includes: Determine the time domain position of the first transmission of the PDCCH, and start performing downlink repeated reception of the PDCCH from the time domain position of the first transmission of the PDCCH; After the repeated reception of the PDCCH ends, determine the first time domain position based on the second time domain position and the time domain offset; Start performing downlink repeated reception of the PDSCH from the first time domain position.

3. The downlink transmission method according to claim 1 or 2, characterized in that, The first time domain position is at the position corresponding to the slot offset after the second time domain position.

4. The downlink transmission method according to any one of claims 1 to 3, characterized in that The slot offset is from 0 to 3 slots.

5. The downlink transmission method according to any one of claims 1 to 4, characterized in that The performing downlink repeated reception of the Physical Downlink Control Channel (PDCCH) and the Physical Downlink Shared Channel (PDSCH) based on the slot offset includes: Based on a first parameter, a second parameter, and the slot offset, perform downlink repeated reception of the PDCCH and the PDSCH; Wherein, the first parameter indicates the number of repeated transmissions of the PDCCH, and the second parameter indicates the number of repeated transmissions of the PDSCH.

6. The downlink transmission method according to any one of claims 1 to 5, characterized in that, The time difference between different repeated transmissions of the PDCCH is specified by the protocol or statically configured through Radio Resource Control (RRC) signaling sent by the network device.

7. A downlink transmission method, characterized in that, Applied to a network device, the downlink transmission method includes: Based on the slot offset, perform downlink repeated transmission of the Physical Downlink Control Channel (PDCCH) and the Physical Downlink Shared Channel (PDSCH); Wherein, the slot offset is the slot offset of a first time domain position relative to a second time domain position, the second time domain position is the time domain position of the Nth transmission or the last transmission of the PDCCH, the first time domain position is the time domain position of the first transmission of the PDSCH, and the Nth transmission is any transmission of the PDCCH other than the first transmission and the last transmission of the PDCCH.

8. The downlink transmission method according to claim 7, characterized in that The performing downlink repeated transmission of the Physical Downlink Control Channel (PDCCH) and the Physical Downlink Shared Channel (PDSCH) based on the slot offset includes: Determine the time domain position of the first transmission of the PDCCH, and start performing downlink repeated transmission of the PDCCH from the time domain position of the first transmission of the PDCCH; After the repeated transmission of the PDCCH ends, determine the first time domain position based on the second time domain position and the time domain offset; Starting from the first time-domain position, perform downlink repeated transmission of the PDSCH.

9. The downlink transmission method according to claim 7 or 8, characterized in that, The first time-domain position is at the position corresponding to the slot offset after the second time-domain position.

10. The downlink transmission method according to any one of claims 7 to 9, characterized in that, The slot offset is from 0 to 3 slots.

11. The downlink transmission method according to any one of claims 7 to 10, characterized in that, Performing downlink repeated transmission of the physical downlink control channel PDCCH and the physical downlink shared channel PDSCH based on the slot offset includes: Performing downlink repeated transmission of the PDCCH and the PDSCH based on a first parameter, a second parameter, and the slot offset; wherein the first parameter indicates the number of repeated transmissions of the PDCCH, and the second parameter indicates the number of repeated transmissions of the PDSCH.

12. The downlink transmission method according to any one of claims 7 to 11, characterized in that, The time difference between different PDCCH repeated transmissions is specified by the protocol or statically configured by radio resource control RRC signaling sent by the network device.

13. A downlink transmission device, characterized in that, Applied to a terminal, the downlink transmission device includes: A transmission unit, configured to perform downlink repeated reception of the physical downlink control channel PDCCH and the physical downlink shared channel PDSCH based on the slot offset; wherein the slot offset is the slot offset of the first time-domain position relative to the second time-domain position, the second time-domain position is the time-domain position of the Nth transmission or the last transmission of the PDCCH, the first time-domain position is the time-domain position of the first transmission of the PDSCH, and the Nth transmission is any transmission of the PDCCH other than the first transmission and the last transmission of the PDCCH.

14. A downlink transmission device, characterized in that, Applied to a network device, the downlink transmission device includes: A sending unit, configured to perform downlink repeated transmission of the physical downlink control channel PDCCH and the physical downlink shared channel PDSCH based on the slot offset; wherein the slot offset is the slot offset of the first time-domain position relative to the second time-domain position, the second time-domain position is the time-domain position of the Nth transmission or the last transmission of the PDCCH, the first time-domain position is the time-domain position of the first transmission of the PDSCH, and the Nth transmission is any transmission of the PDCCH other than the first transmission and the last transmission of the PDCCH.

15. A downlink transmission device, characterized in that, Includes: A processor; A memory for storing processor-executable instructions; wherein the processor is configured to execute the downlink transmission method according to any one of claims 1 to 6.

16. A downlink transmission device, characterized in that, Includes: A processor; A memory for storing processor-executable instructions; wherein the processor is configured to execute the downlink transmission method according to any one of claims 7 to 12.

17. A non-transitory computer-readable storage medium, characterized in that, When the instructions in the storage medium are executed by the processor of the terminal, the terminal is enabled to execute the downlink transmission method according to any one of claims 1 to 6.

18. A non-transitory computer-readable storage medium, characterized in that, When the instructions in the storage medium are executed by the processor of the network device, the network device is enabled to execute the downlink transmission method according to any one of claims 7 to 12.

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