Downlink transmission method and apparatus, device, and storage medium

Abstract

A downlink transmission method and apparatus, a device, and a storage medium, relating to the technical field of communications. The method is executed by a terminal device, and the method comprises: monitoring or receiving a downlink channel or signal within a first time window, wherein the first time window is determined on the basis of a first time length and / or an RTT length (410). The terminal device determines the first time window on the basis of the first time length and / or the RTT length, and then monitors or receives the downlink channel or signal within the first time window, preventing the terminal device from detecting the downlink channel or signal within an invalid time period, thus reducing power consumption of the terminal device and improving the efficiency of a communication system.

Description

Downlink transmission methods, apparatus, equipment and storage media Technical Field

[0001] This application relates to the field of communication technology, and in particular to a downlink transmission method, apparatus, device, and storage medium. Background Technology

[0002] During the random access process, terminal devices send random access messages to network devices. However, in some cases, the available service time for each cell is not continuous. How to effectively utilize available resources to complete the random access process when a terminal device wants to access that cell requires further discussion and research. Summary of the Invention

[0003] This application provides a downlink transmission method, apparatus, device, and storage medium. The technical solution is as follows:

[0004] According to one aspect of the embodiments of this application, a downlink transmission method is provided, the method being executed by a terminal device, the method comprising:

[0005] Within a first time window, listen to or receive downlink channels or signals, the first time window being determined based on a first time length and / or RTT (Round Trip Time) duration.

[0006] According to one aspect of the embodiments of this application, a downlink transmission method is provided, the method being performed by a network device, the method comprising:

[0007] A downlink channel or signal is transmitted, which is monitored or received by the terminal device within a first time window, the first time window being determined based on a first time length and / or RTT duration.

[0008] According to one aspect of the embodiments of this application, a downlink transmission apparatus is provided, the apparatus comprising:

[0009] The receiving module is used to listen to or receive downlink channels or signals within a first time window, the first time window being determined based on a first time length and / or RTT duration.

[0010] According to one aspect of the embodiments of this application, a downlink transmission apparatus is provided, the apparatus comprising:

[0011] The transmitting module is used to transmit a downlink channel or signal, which is monitored or received by the terminal device within a first time window, the first time window being determined based on a first time length and / or RTT duration.

[0012] According to one aspect of the embodiments of this application, a communication device is provided, the communication device including a processor and a memory, the memory storing a computer program, the processor executing the computer program to implement the downlink transmission method described above. The communication device is a terminal device, or the communication device is a network device.

[0013] According to one aspect of the embodiments of this application, a computer-readable storage medium is provided, the storage medium storing a computer program for execution by a processor to implement the downlink transmission method described above.

[0014] According to one aspect of the embodiments of this application, a chip is provided, the chip including programmable logic circuits and / or program instructions, which, when the chip is running, are used to implement the downlink transmission method described above.

[0015] According to one aspect of the embodiments of this application, a computer program product is provided, the computer program product including computer instructions stored in a computer-readable storage medium, and a processor reading from the computer-readable storage medium and executing the computer instructions to implement the downlink transmission method described above.

[0016] The technical solutions provided in this application embodiment may have the following beneficial effects:

[0017] The terminal device determines the first time window based on the first time length and / or RTT duration, and then listens for or receives downlink channels or signals within the first time window. This avoids the terminal device detecting downlink channels or signals during invalid time periods, thereby saving the power consumption of the terminal device and improving the efficiency of the communication system. Attached Figure Description

[0018] Figure 1 is a schematic diagram of a network architecture provided in one embodiment of this application;

[0019] Figure 2 is a schematic diagram of a discontinuous transmission scenario provided in an embodiment of this application;

[0020] Figure 3 is a schematic diagram of resource usage in a community within a health coverage area provided in one embodiment of this application;

[0021] Figure 4 is a flowchart of a downlink transmission method provided in an embodiment of this application;

[0022] Figure 5 is a schematic diagram of the starting position of a first time window provided in an embodiment of this application;

[0023] Figure 6 is a schematic diagram of the starting position of the first time window provided in another embodiment of this application;

[0024] Figure 7 is a schematic diagram of the starting position of the first time window provided in another embodiment of this application;

[0025] Figure 8 is a schematic diagram of the starting position of the first time window provided in another embodiment of this application;

[0026] Figure 9 is a schematic diagram of the starting position of the first time window provided in another embodiment of this application;

[0027] Figure 10 is a block diagram of a downlink transmission device provided in an embodiment of this application;

[0028] Figure 11 is a block diagram of a downlink transmission device provided in another embodiment of this application;

[0029] Figure 12 is a schematic diagram of the structure of a communication device provided in an embodiment of this application. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0031] The network architecture and business scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0032] Please refer to Figure 1, which shows a schematic diagram of a network architecture 100 provided in one embodiment of this application. The network architecture 100 may include: a terminal device 10, an access network device 20, and a core network element 30.

[0033] Terminal device 10 can refer to UE (User Equipment), STA (Station), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, wireless communication device, user agent, or user equipment. In some embodiments, terminal device 10 can also be a cellular phone, cordless phone, SIP (Session Initiation Protocol) phone, WLL (Wireless Local Loop) station, PDA (Personal Digital Assistant), handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, vehicle-mounted device, wearable device, terminal device in 5GS (5th Generation System), or terminal device in the future evolved PLMN (Public Land Mobile Network), etc., and this application embodiment is not limited to these. For ease of description, the devices mentioned above are collectively referred to as terminal devices. The number of terminal devices 10 is usually multiple, and one or more terminal devices 10 can be distributed within the cell managed by each access network device 20. Terminal equipment can also be simply referred to as terminal or UE, the meaning of which can be understood by those skilled in the art.

[0034] Access network device 20 is a device deployed in an access network to provide wireless communication functionality to terminal device 10. Access network device 20 may include various forms of macro base stations, micro base stations, relay stations, APs (Access Points), etc. In systems employing different wireless access technologies, the name of the device with access network device functionality may differ; for example, in a 5G NR (New Radio) system, it is called gNodeB or gNB (Next Generation Node B). As communication technologies evolve, the name "access network device" may change. For ease of description, in this embodiment, the aforementioned devices providing wireless communication functionality to terminal device 10 are collectively referred to as access network devices. In some embodiments, a communication relationship can be established between terminal device 10 and core network element 30 through access network device 20. For example, in an LTE (Long Term Evolution) system, access network device 20 can be one or more eNodeBs within an EUTRAN (Evolved Universal Terrestrial Radio Access Network); in a 5G NR system, access network device 20 can be one or more gNBs within a RAN (Radio Access Network). In the embodiments of this application, unless otherwise specified, "network device" refers to access network device 20, such as a base station.

[0035] Core network element 30 is a network element deployed in the core network. Its main functions are to provide user connectivity, manage users, and bear services, serving as an interface to external networks. For example, core network elements in a 5G NR system may include AMF (Access and Mobility Management Function) entities, UPF (User Plane Function) entities, and SMF (Session Management Function) entities.

[0036] In some embodiments, the access network device 20 and the core network element 30 communicate with each other via some air interface technology, such as the NG interface in a 5G NR system. The access network device 20 and the terminal device 10 communicate with each other via some air interface technology, such as the Uu interface.

[0037] The "5G NR system" in this application embodiment can also be referred to as a 5G system or an NR system, but those skilled in the art will understand its meaning. The technical solutions described in this application embodiment can be applied to LTE systems, 5G NR systems, and subsequent evolution systems of 5G NR systems (such as B5G (Beyound 5G) systems, 6G systems (6th Generation System), and other communication systems such as NB-IoT (Narrow Band Internet of Things) systems. This application does not limit these applications.

[0038] In this embodiment, the network device can provide services to a cell. The terminal device communicates with the network device through the transmission resources (e.g., frequency domain resources, or spectrum resources) on the carrier used by the cell. The cell can be the cell corresponding to the network device (e.g., a base station). The cell can belong to a macro base station or to a base station corresponding to a small cell. The small cell can include: metro cell, micro cell, pico cell, femto cell, etc. These small cells have the characteristics of small coverage area and low transmission power, and are suitable for providing high-speed data transmission services.

[0039] Before introducing the technical solution of this application, some related technical knowledge involved in this application will be introduced and explained. The following related technologies are optional solutions and can be arbitrarily combined with the technical solutions of the embodiments of this application, all of which fall within the protection scope of the embodiments of this application. The embodiments of this application include at least some of the following contents.

[0040] 1. Initial Access Process in NR System

[0041] Before initiating random access, the terminal device measures and evaluates the signal quality of the cell and the signal strength of each SSB (Synchronization Signal / PBCH Block) within the cell. If the detected SSB signal strength exceeds a threshold, the terminal device determines the strongest or relatively strong SSB. For example, if the terminal device determines SSB#1 as the strongest SSB, it determines the corresponding PRACH (Physical Random Access Channel) transmission opportunity for SSB#1 as RO#1 based on the mapping relationship between SSB and RO (Random Access Occasion), and sends a preamble on RO#1. If the network device successfully receives the preamble, it can determine the SSB selected by the terminal device based on the resource information obtained from the successful reception of the preamble. For example, the network device can determine that the preamble is associated with SSB#1 based on the association relationship, and thus determine the beam information corresponding to subsequent communication based on SSB#1.

[0042] The four-step random access process may include the following steps:

[0043] The first step is for the terminal device to send a random access preamble (also known as Msg1) to the network device on the PRACH resources of the uplink initial BWP (Bandwidth Part).

[0044] The second step involves the network device, upon detecting Msg1, sending a PDCCH (Physical Downlink Control Channel) scrambled with RA-RNTI (Random Access-Radio Network Temporary Identifier) ​​to the terminal device via resources in the Type1-PDCCH Common Search Space (CSS) on the downlink initial BWP. The PDSCH (Physical Downlink Shared Channel) scheduled by this PDCCH may include the random access response (RAR, also known as Msg2) corresponding to the preamble sent by the terminal device. Correspondingly, the terminal device uses RA-RNTI to detect the PDCCH on the Type1-PDCCH CSS on the downlink initial BWP, and upon detecting the PDCCH, determines whether it includes the RAR sent to it by the network device based on the PDSCH scheduled by that PDCCH. The RAR may include information such as uplink authorization from message 3 (Msg3), timing advance command (TA command), and temporary cell-RNTI (TC-RNTI). Among them, the Type1-PDCCH CSS is configured by the network device through system messages and / or higher-layer parameters.

[0045] Third, after receiving the RAR, the terminal device transmits Msg3 on the uplink resources indicated by the RAR. This step supports HARQ (Hybrid Automatic Repeat Request) retransmission. If the network device does not correctly receive Msg3, it can use a PDCCH with TC-RNTI scrambling to schedule the retransmission of Msg3. This PDCCH can carry DCI (Downlink Control Information) format 0_0.

[0046] In the fourth step, the network device sends message 4 (Msg4) to the terminal device, which includes a contention resolution message. This step supports HARQ retransmission. If the terminal device does not correctly receive Msg4, the network device can use a PDCCH with TC-RNTI scrambling to schedule the retransmission of Msg4. This PDCCH can carry DCI format 1_0. If the terminal device correctly receives Msg4 and determines that it is a message from that terminal device, the random access procedure for that terminal device succeeds; otherwise, the random access procedure fails. The terminal device needs to initiate the random access procedure again from step one.

[0047] The two-step random access process may include the following steps:

[0048] The first step is for the terminal device to send message A (MsgA) to the network device on the RO and PO (PUSCH Occasion) of the uplink initial BWP. MsgA includes MsgA Preamble and MsgA PUSCH (Physical Uplink Shared Channel).

[0049] In the second step, after detecting MsgA, the network device sends a MsgB-RNTI-scrambled PDCCH to the terminal device through resources in the Type1-PDCCH common search space (CSS) on the downlink initial BWP. The PDSCH scheduled by this PDCCH may include the random access response (also known as MsgB) corresponding to MsgA sent by the terminal device. If the network device only detects MsgA Preamble and does not receive MsgA PUSCH, the PDSCH scheduled by this PDCCH may include the backoff RAR corresponding to MsgA Preamble sent by the terminal device. Accordingly, the terminal device uses MsgB-RNTI to detect PDCCH on the Type1-PDCCH CSS on the downlink initial BWP, and after detecting PDCCH, determines whether it includes a success RAR or a backoff RAR sent by the network device based on the PDSCH scheduled by this PDCCH. If the terminal device correctly receives the success RAR, the terminal device sends an ACK (Acknowledgment) message back to the network device, and the random access procedure of the terminal device is successful. Alternatively, if the terminal device receives a rollback RAR, it sends Msg3 on the uplink resources indicated by the rollback RAR, and the two-step random access procedure falls back to a four-step random access procedure. Alternatively, if the terminal device does not receive any RAR, the random access procedure fails, and the terminal device needs to initiate the random access procedure again from step one.

[0050] 2. Frequency hopping transmission in NTN (Non-Terrestrial Network) systems

[0051] In NTN systems, satellites provide communication services to the ground over a large area. Considering the limited total transmit power of the satellite, a signal-to-noise ratio (SNR) is required for different downlink channels to ensure normal access for ground-based terminal devices. Assuming a system bandwidth of 30MHz and a total satellite transmit power of 18.8dBW, and meeting the SNR requirements for different downlink channels, the satellite can have a maximum of 24 active satellite antenna beams at any given time, with each beam corresponding to a coverage area of ​​50km in diameter. In other words, to achieve the coverage area of ​​a satellite using 24 active satellite antenna beams, simulated beamforming technology can be used. This involves using phase shifters to change the phase of each antenna's corresponding channel, allowing a group of antennas to form beams in different directions. Beam sweeping is then used to achieve satellite coverage, meaning different areas within the satellite's coverage area are covered at different times using beams corresponding to different directions. Based on these assumptions, Table 1 presents the satellite coverage information for different minimum UE elevation angles.

[0052] Table 1 Satellite Coverage Information

[0053] The aforementioned method of achieving satellite coverage through beam scanning can also be called discontinuous communication transmission. Figure 2 shows a schematic diagram of this discontinuous communication transmission scenario. As shown in Figure 2, different areas within the satellite coverage area are associated with different cells or beams, or different areas within the satellite coverage area are associated with different cell groups or beam groups. In this application, it is assumed that the satellite can have at most M groups of active satellite antenna beams at any given time, and each group of satellite antenna beams corresponds to the coverage area of ​​one cell, that is, the satellite corresponds to the coverage area of ​​one cell group at any given time, and each cell group includes M cells. To achieve satellite coverage, the number of times the satellite antenna beams need to be scanned is N, that is, the satellite needs to serve N cell groups through beam scanning. The satellite's coverage area includes a total of M*N cells. The service time of each cell is the time length between two adjacent times. For example, the service time of a cell in the nth cell group is the time length between time Tn and time Tn+1, where n = 0, 1, ..., N-1. At time t0, the M-group satellite antenna beams serve the first cell group (cell-i, cell-j, ..., cell-m); at time t1, the M-group satellite antenna beams switch to serve the second cell group (cell-i+1, cell-j+1, ..., cell-m+1); ..., and so on, until satellite coverage is achieved. The service time for each cell is the time length between two adjacent times. For example, the service time for a cell in the first cell group is the time length between time T0 and time T1.

[0054] As mentioned earlier, the service time for each cell or beam is discontinuous. Figure 3 shows a resource usage diagram for cells in the second cell group, assuming that the satellite antenna beams provide the same service time within the satellite coverage area and that five cell groups need to be served via beam scanning. Since the service time for each cell is discontinuous, how to effectively utilize available resources to complete the random access process when a terminal device wants to access that cell is a problem to be solved.

[0055] Please refer to Figure 4, which shows a flowchart of a downlink transmission method provided in one embodiment of this application. The method is performed by a terminal device. The method includes the following step 410.

[0056] Step 410: Within the first time window, the terminal device listens to or receives downlink channels or signals. The first time window is determined based on the first time length and / or RTT duration.

[0057] Accordingly, network devices send downlink channels or signals within the first time window.

[0058] In some embodiments, the terminal device operates in a discontinuous reception state. A discontinuous reception state refers to the terminal device receiving downlink channels or signals within discontinuous time windows. For example, the terminal device operates in the transmission scenario shown in Figure 2. In some embodiments, the cell where the terminal device is located operates in a discontinuous transmission state. A discontinuous transmission state refers to the cell transmitting downlink channels or signals within discontinuous time windows. For example, the cell where the terminal device is located is one of the cells shown in Figure 3.

[0059] In some embodiments, the terminal device may be a terminal device operating in an NTN (Network-to-Network) scenario, such as the terminal device operating in the scenario shown in Figure 2. In some embodiments, the terminal device may also be a terminal device operating in a TN (Terrestrial Network) scenario. Exemplarily, the terminal device is an A-IoT (Ambient Internet of Things) device that is woken up based on a wake-up signal. Exemplarily, the terminal device may also be a terminal device operating within the coverage area of ​​an energy-efficient community.

[0060] In some embodiments, the downlink channel or signal is one of the following:

[0061] The first downlink channel or signal is used to schedule downlink channels or signals carrying RAR;

[0062] The second downlink channel or signal is used to schedule downlink channels or signals carrying contention resolution messages.

[0063] In some embodiments, a first downlink channel or signal is used to schedule a third downlink channel or signal, the third downlink channel or signal carrying a Redirect Access Registry (RAR). In some embodiments, the RAR carried by the third downlink channel or signal may be a RAR used in response to Msg1 during a four-step random access process, or a RAR used in response to MsgA during a two-step random access process. In some embodiments, the RAR includes at least one of the following: a RAR, a success RAR, and a fallback RAR. Wherein, the RAR is the RAR in a four-step random access process; the success RAR or the fallback RAR is the RAR in a two-step random access process. In some embodiments, the first downlink channel or signal is a PDCCH, or a DCI transmitted in the PDCCH.

[0064] In some embodiments, prior to step 410, the terminal device sends a first uplink channel or signal to the network device. In some embodiments, the first uplink channel or signal includes a random access channel or signal. Exemplarily, the first uplink channel or signal is PRACH, which is also referred to as Msg1. Exemplarily, the first uplink channel or signal is MsgA, which includes PUSCH and PRACH.

[0065] In some embodiments, a second downlink channel or signal is used to schedule a fourth downlink channel or signal, which carries a contention resolution message. In some embodiments, the contention resolution message may be a contention resolution message for contention-based random access, for example, carrying a contention resolution identifier or terminal device identifier, or it may be a contention resolution message corresponding to other contention-based uplink channels or signals. For example, the contention resolution message may be a response message to a CG-PUSCH transmitted on a CG (Configured Grant) resource.

[0066] In some embodiments, prior to step 410, the terminal device sends a second uplink channel or signal to the network device. In some embodiments, the second uplink channel or signal includes a contention-based random access channel or signal. For example, the second uplink channel or signal is Msg3. In some embodiments, the second uplink channel or signal includes a contention-based PUSCH. For example, the second uplink channel or signal is a CG-PUSCH transmitted on a CG (Configured Grant) resource, wherein the CG resource is a public CG-PUSCH resource configured by the network device. For example, in the case where the network includes public CG resources, when the terminal device needs to send an SR (Scheduling Request), it can send a CG-PUSCH to the network device through this CG resource.

[0067] In some embodiments, the first time window is determined based on a first time length and / or the RTT (Round-Trip Time) duration. In some embodiments, the first time length is related to the time interval between discontinuous receptions by the terminal device. In some embodiments, the first time length is determined based on the time interval between discontinuous receptions by the terminal device. Exemplarily, the first time length is greater than or equal to the time interval between discontinuous receptions by the terminal device. The RTT duration refers to the total time from the start of data transmission by the sender to the receipt of data and return of acknowledgment information by the receiver, and finally back to the sender. Generally, the greater the distance between the sender and receiver, the longer the RTT duration is typically.

[0068] In some embodiments, the unit of the first time length includes one of the following: symbol, time slot, subframe, frame, half-frame, microsecond, millisecond, second.

[0069] In some embodiments, the SCS (Subcarrier Spacing) corresponding to the first time length is related to the information transmitted in the downlink channel or signal. In some embodiments, the unit of the first time length is a symbol or a time slot, and the SCS corresponding to the first time length is one of the following: SCS of SSB, SCS of Type 0-PDCCH, SCS of Type 1-PDCCH, SCS of PRACH, and SCS of MsgA PUSCH.

[0070] The technical solution provided in this application embodiment allows the terminal device to determine a first time window based on a first time length and / or RTT duration, and then listen to or receive downlink channels or signals within the first time window. This avoids the terminal device detecting downlink channels or signals during invalid time periods, thereby saving power consumption of the terminal device and improving the efficiency of the communication system.

[0071] Regarding the start time of the first time window

[0072] The above embodiments propose that the downlink channel or signal is one of the first downlink channel or signal and the second downlink channel or signal. The following will describe in detail the downlink channel or signal as the first downlink channel or signal and the downlink channel or signal as the second downlink channel or signal.

[0073] The downlink channel or signal is the first downlink channel or signal.

[0074] In some embodiments, the first downlink channel or signal is used to schedule the downlink channel or signal carrying the RAR. In some embodiments, the RAR can be a RAR for Msg1 or a RAR for MsgA. For example, if the RAR is for Msg1, the first downlink channel or signal is used to schedule the downlink channel or signal carrying the RAR, and before step 410, the terminal device sends the first uplink channel or signal, i.e., Msg1, to the network device. For example, if the RAR is for MsgA, the first downlink channel or signal is used to schedule the downlink channel or signal carrying the successful RAR or the fallback RAR, and before step 410, the terminal device sends the first uplink channel or signal, i.e., MsgA, to the network device.

[0075] In some embodiments, the first uplink channel or signal is PRACH. In some embodiments, the first uplink channel or signal includes PRACH and PUSCH.

[0076] 1. The first uplink channel or signal is PRACH.

[0077] In this case, the first downlink channel or signal is the first PDCCH or the first PDSCH. The first PDCCH is used to schedule the first PDSCH, and the first PDSCH carries the RAR for Msg1.

[0078] In related technologies, the start time of the first time window is the first symbol of the earliest CORESET (Control Resource Set) after the last symbol of the RO of the PRACH transmission and at least one symbol later. This CORESET corresponds to the CORESET of the Type 1-PDCCH CSS configured by the terminal device. If the TA value estimated by the terminal device is not 0 (e.g., in an NTN scenario), the start time of the above first time window is further increased by the UE-gNB RTT duration (i.e., the round-trip time between wireless communication between the terminal device and the network device), abbreviated as RTT duration. The unit of RTT duration is milliseconds. In an NTN scenario, the RTT duration is the sum of the TA value on the terminal device side and the Kmac value configured by the network device. Kmac is the uplink / downlink message offset value configured by the network device through system messages. For example, the network device configures the Kmac value through SIB1.

[0079] In some embodiments, the downlink channel or signal is a first downlink channel or signal, and the start time of the first time window is one of the following:

[0080] The first symbol of the earliest first CORESET after the last symbol of the RO of PRACH and after the first time length;

[0081] The first symbol of the first CORESET after the last symbol of the RO of the PRACH and after at least one symbol plus the first time length;

[0082] The first symbol of the first CORESET after the last symbol of the RO of the PRACH and after the second time length;

[0083] The first symbol of the first CORESET after the last symbol of the RO of the PRACH and after at least one symbol plus the second time length;

[0084] The first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of the PRACH transmission ends and after the first time length has elapsed.

[0085] The first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of the PRACH transmission has ended and after at least one symbol has elapsed and the sum of the first time length;

[0086] The first symbol of the earliest first CORESET after the end of the uplink transmission duration corresponding to the RO of the PRACH transmission and after the second time length;

[0087] The first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of the PRACH transmission has ended and after at least one symbol and the sum of the second time length.

[0088] In some embodiments, the first CORESET is the CORESET corresponding to the Type 1-PDCCH CSS configured for the terminal device. In some embodiments, the first CORESET is a valid CORESET. For example, when the terminal device is configured with Cell DTX and / or DRX (i.e., cell discontinuous transmission and / or discontinuous reception), or when the terminal device is configured with UE DRX (i.e., terminal device discontinuous reception), the first CORESET is the duration of Cell DTX (Discontinuous Transmission) and / or DRX (Discontinuous Reception) enabled, or the first CORESET within the duration of UE DRX enabled.

[0089] In some embodiments, the first downlink channel or signal includes at least one of the following: RA-RNTI scrambled PDCCH, MsgB-RNTI scrambled PDCCH, and C-RNTI scrambled PDCCH.

[0090] In some embodiments, the uplink transmission duration is one of the following:

[0091] The duration of DRX activation in the community;

[0092] The duration for which DTX is enabled on the terminal device.

[0093] In some embodiments, the second time length is determined based on the first time length and / or the RTT duration.

[0094] In some embodiments, the second time length is determined based on the first time length and / or the RTT duration, including at least one of the following:

[0095] The second time length is equal to the maximum value of the first time length and the RTT duration;

[0096] The second time length is K times the first time length, where K is the minimum value that satisfies the condition that the second time length is greater than or equal to the RTT duration;

[0097] The second time length is the sum of the first time length and the RTT duration.

[0098] In one example, the second time length is equal to the maximum of the first time length and the RTT duration. For example, if the first time length is 20ms and the RTT duration is 10ms, then the second time length is 20ms.

[0099] In one example, the second time length is K times the first time length. For instance, if the first time length is 10ms and the RTT duration is 15ms, then K=2, and the second time length is 30ms.

[0100] In one example, the second time length is the sum of the first time length and the RTT duration. For example, the first time length is 20ms, the RTT duration is 10ms, and the second time length is 20 + 10 = 30ms.

[0101] As can be seen from the above introduction, the start time of the first time window includes two cases: one is determined based on the last symbol of the RO that sent the PRACH, and the other is determined based on the end of the uplink transmission duration corresponding to the RO that sent the PRACH.

[0102] For example, Figure 5 shows a schematic diagram of the start time of the first time window when the cell is configured with Cell DTX and / or DRX, and the start time of the first time window is the first symbol of the earliest first CORESET after the last symbol of the RO that transmits PRACH and after the first time length.

[0103] For example, Figure 6 illustrates the start time of the first time window when the cell is configured with Cell DTX and / or DRX, and the first time window starts at the last symbol of the RO of the PRACH transmission and after at least one symbol has passed plus the first time length, which is the first symbol of the earliest first CORESET. In some embodiments, after transmitting the first uplink channel or signal, the terminal device needs a period of time to switch to receiving the downlink channel or signal, so time needs to be reserved for the terminal device to perform transmit / receive handover. If the first time length is short, the terminal device will not have enough time to perform transmit / receive handover, so at least one symbol will pass after the first time length.

[0104] For example, Figure 7 illustrates the start time of the first time window when the cell is configured with Cell DTX and / or DRX, and the first time window starts at the first symbol of the earliest first CORESET after the last symbol of the RO transmitting PRACH and after a second time length. Here, the second time length is equal to the maximum of the first time length and the RTT duration. In this example, the second time length is equal to the RTT duration.

[0105] For example, Figure 8 shows a schematic diagram of the start time of the first time window when the cell is configured with Cell DTX and / or DRX, and the start time of the first time window is the first symbol of the earliest first CORESET after the last symbol of the RO transmitting PRACH and after at least one symbol plus the second time length. Here, the second time length is K times the first time length, where K is the minimum value that satisfies the condition that the second time length is greater than or equal to the RTT duration. In this example, K is 2.

[0106] Figures 5 to 8 above illustrate how the start time of the first time window is determined based on the last symbol of the RO (Redirection) of the PRACH transmission. Regarding determining the start time of the first time window based on the end of the uplink transmission duration corresponding to the RO of the PRACH transmission, the only difference is the start time of the first or second time length; therefore, please refer to Figures 5 to 8 above. For the start time of the first or second time length, please refer to the example in Figure 9.

[0107] For example, Figure 9 shows a schematic diagram of the start time of the first time window when the cell is configured with Cell DTX and / or DRX, and the start time of the first time window is the first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of the PRACH transmission has ended and after a second time length. The second time length is the sum of the first time length and the RTT duration.

[0108] 2. The first uplink channel or signal is PRACH and PUSCH.

[0109] In this case, the first downlink channel or signal is the first PDCCH or the first PDSCH. The first PDCCH is used to schedule the first PDSCH, and the first PDSCH carries the RAR for MsgA.

[0110] Compared to the above example where the first uplink channel or signal is PRACH, this example differs only in the start time of the first time length or the second time length when determining the start time of the first time window. In this example, the start time of the first time length or the second time length is the last symbol of the PO corresponding to the RO transmitting PRACH, or the end of the uplink transmission duration corresponding to the PO corresponding to the RO transmitting PRACH.

[0111] In some embodiments, the downlink channel or signal is a first downlink channel or signal, and the start time of the first time window is one of the following:

[0112] The first symbol of the first CORESET after the last symbol of the PO corresponding to the RO of the PRACH and after the first time length.

[0113] The first symbol of the first CORESET after the last symbol of the PO corresponding to the RO of the PRACH transmission and after at least one symbol plus the first time length;

[0114] The first symbol of the first CORESET after the last symbol of the PO corresponding to the RO of the PRACH and after the second time length;

[0115] The first symbol of the first CORESET after the last symbol of the PO corresponding to the RO of the PRACH transmission and after at least one symbol plus the second time length;

[0116] The first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH has ended and after the first time length has elapsed.

[0117] The first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH has ended and after at least one symbol has elapsed and the sum of the first time length;

[0118] The first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH has ended and after the second time length has elapsed.

[0119] The first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH has ended and after at least one symbol and the sum of the second time length.

[0120] In some embodiments, the first downlink channel or signal includes at least one of the following: a PDCCH scrambled with C-RNTI or a PDCCH scrambled with MsgB-RNTI.

[0121] In some embodiments, RAR includes at least one of the following: successful RAR, rollback RAR.

[0122] In some embodiments, the PO corresponding to the RO that sends the PRACH refers to the PO in the PUSCH corresponding to the RO that sends the PRACH.

[0123] For details on how to determine the start time of the first time window, please refer to the examples in Figures 5 to 9 above. This application will not elaborate further here.

[0124] The downlink channel or signal is the second downlink channel or signal.

[0125] In some embodiments, a second downlink channel or signal is used to schedule a downlink channel or signal carrying a contention resolution message. In some embodiments, the contention resolution message may be a contention resolution message for contention-based random access, such as Msg4. In some embodiments, the contention resolution message may also be a contention resolution message for a contention-based resource request message, such as a response message for a CG-PUSCH transmission. For example, a network device configures a public CG-PUSCH resource for a terminal device to access the network. The terminal device can send CG-PUSCH through this public CG-PUSCH resource (e.g., the terminal device sends an SR through this CG-PUSCH). Since the CG-PUSCH resource is a public resource, the terminal device can carry its own identifier when sending the CG-PUSCH through this public resource. If the network device correctly receives the CG-PUSCH, it can carry the terminal device identifier in the response information for the CG-PUSCH transmission. This response information carrying the terminal device identifier can be considered a contention resolution message.

[0126] 1. The second uplink channel or signal is CG-PUSCH

[0127] In this case, the second downlink channel or signal is the second PDCCH or the second PDSCH. The second PDCCH is used to schedule the second PDSCH, and the second PDSCH carries response information of CG-PUSCH, such as the terminal device identifier.

[0128] In some embodiments, the downlink channel or signal is a second downlink channel or signal, and the start time of the first time window is one of the following:

[0129] The first symbol after the end position of the CG-PUSCH transmission and after the first time length;

[0130] The first symbol after the end position of the CG-PUSCH transmission and after the second time length;

[0131] The first symbol after the end of the uplink transmission duration corresponding to CG-PUSCH and after the first time length has elapsed;

[0132] The first symbol after the end of the uplink transmission duration corresponding to CG-PUSCH and after the second time length.

[0133] In some embodiments, the second downlink channel or signal includes at least one of the following: a PDCCH scrambled with C-RNTI or a PDCCH scrambled with CG-RNTI.

[0134] Compared to the example where the first uplink channel or signal is PRACH, this example differs only in the start time of the first time window, where the start time of the first time length or the second time length is determined. In this example, the start time of the first time length or the second time length is the end position of the CG-PUSCH transmission, or the end of the uplink transmission duration corresponding to the CG-PUSCH. For details on how to determine the start time of the first time window, please refer to the examples in Figures 5 to 9 above; these will not be elaborated upon here.

[0135] 2. The second uplink channel or signal is Msg3.

[0136] In this case, the second downlink channel or signal is the second PDCCH or the second PDSCH. The second PDCCH is used to schedule the second PDSCH. The second PDSCH carries a contention resolution message or the second PDSCH is Msg4 PDSCH.

[0137] In some embodiments, the downlink channel or signal is a second downlink channel or signal, and the start time of the first time window is one of the following:

[0138] Msg 3 is the first symbol after the end of the PUSCH transmission and after the first time length.

[0139] Msg 3 is the first symbol after the end of the PUSCH transmission and after the second time length.

[0140] Msg 3 PUSCH corresponds to the first symbol after the uplink transmission duration has ended and the first time length has elapsed;

[0141] Msg 3 PUSCH corresponds to the first symbol after the uplink transmission duration has ended and after the second time length has elapsed.

[0142] In some embodiments, the second downlink channel or signal includes at least one of the following: TC-RNTI scrambled PDCCH, C-RNTI scrambled PDCCH.

[0143] Compared to the example where the first uplink channel or signal is PRACH, this example differs only in the start time of the first time window, where the start time of the first time length or the second time length is determined. In this example, the start time of the first time length or the second time length is the end position of the Msg3-PUSCH transmission, or the end of the uplink transmission duration corresponding to Msg3-PUSCH. For details on how to determine the start time of the first time window, please refer to the examples in Figures 5 to 9 above; these will not be elaborated upon here.

[0144] The above embodiments provide a method for the terminal device to determine the start time of the first time window under different circumstances, so as to avoid the terminal device detecting the downlink channel or signal during the invalid time period, thereby saving the power consumption of the terminal device and improving the efficiency of the communication system.

[0145] Regarding the length of the first time window

[0146] In some embodiments, the length of the first time window is configured by the network device. For example, the length of the first time window is determined based on parameters configured by the network device.

[0147] In some embodiments, the length of the first time window is determined according to at least one of the following parameters: first time length, third time length, first time domain unit, and number of first time domain units.

[0148] For example, the length of the first time window is equal to the sum of the first time length and the time length corresponding to the first time domain unit. The time length corresponding to the first time domain unit is determined based on the first time domain unit and the number of first time domain units. To avoid the time unit corresponding to the first time domain unit being different from the time unit corresponding to the first time length, the units of the two need to be unified before the above calculation is performed.

[0149] In some embodiments, the first time domain unit and / or the number of first time domain units is configured by the network device. In some embodiments, the first time domain unit and / or the number of first time domain units is a time domain unit determined based on the SCS of the Type1-PDCCH CSS set.

[0150] For example, the length of the first time window is equal to the sum of the first time length, the third time length, and the time length corresponding to the first time domain unit.

[0151] In some embodiments, the third time length includes one of the following: the length of downlink transmission duration, the length of cell DTX activation duration, and the length of terminal device DRX activation duration.

[0152] In some embodiments, when the terminal device is configured with Cell DTX and / or DRX, the behavior of the terminal device includes at least one of the following: receiving downlink channels or signals during the Cell DTX on (On) time window, not receiving downlink channels or signals during the Cell DTX off (Off) time window, transmitting uplink channels or signals during the Cell DRX on (On) time window, and not transmitting uplink channels or signals during the Cell DRX off (Off) time window.

[0153] In some embodiments, when the terminal device is configured with Cell DTX and / or DRX, the network device's behavior includes at least one of the following: transmitting downlink channels or signals during the Cell DTX enabled time window, not transmitting downlink channels or signals during the Cell DTX disabled time window, receiving uplink channels or signals during the Cell DRX enabled time window, and not receiving uplink channels or signals during the Cell DRX disabled time window.

[0154] In some embodiments, when the terminal device is configured with UE DRX, the behavior of the terminal device includes at least one of the following: receiving downlink channels or signals during the time window when UE DRX is enabled, and not receiving downlink channels or signals during the time window when UE DRX is disabled.

[0155] In some embodiments, when a terminal device is configured with UE DRX, the network device's behavior includes at least one of the following: transmitting a dedicated downlink channel or signal for the terminal device during a UE DRX-enabled time window, and not transmitting a dedicated downlink channel or signal for the terminal device during a UE DRX-disabled time window. It is understood that the dedicated downlink channel or signal for the terminal device includes downlink channels or signals carrying terminal device-specific information.

[0156] In some embodiments, the unit of time length mentioned in this application includes one of the following: symbol, time slot, subframe, frame, half-frame, microsecond, millisecond, second, which is not limited in this application. The time length mentioned in this application includes, but is not limited to, a first time length, a second time length, a third time length, and the length of a first time window.

[0157] In some embodiments, the first time-domain unit includes one of the following: symbol, time slot, subframe, frame, half-frame, microsecond, millisecond, second.

[0158] In the above example, adding a first time length and / or a third time length to the time length corresponding to the first time domain unit is to prevent the terminal device from detecting the downlink channel or signal during an invalid time period, which would lead to downlink reception failure. The actual time length that can be used to listen to / receive the downlink channel or signal is the time length corresponding to the first time domain unit.

[0159] Regarding the first time length

[0160] In some embodiments, the first time length is configured by the network device. In some embodiments, the first time length is configured by the network device based on first indication information.

[0161] In some embodiments, the first time length is determined based on first indication information, which is carried in at least one of the following: MIB (Master Information Block), SIB (System Information Block), RRC (Radio Resource Control), MAC CE (Medium Access Control Control Element), DCI, and PDSCH. Exemplarily, SIB includes SIB1, and the first indication information is carried in SIB1.

[0162] In some embodiments, the downlink channel or signal is a second downlink channel or signal, and the first indication information, in addition to the information described above, may also be carried in the information for scheduling the second downlink channel or signal, or carried in the first downlink channel or signal.

[0163] In some embodiments, the first time length is determined based on first indication information, which is carried in at least one of the following:

[0164] RA-RNTI scrambled PDCCH;

[0165] RA-RNTI scrambled PDCCH scheduling PDSCH;

[0166] MsgB-RNTI scrambled PDCCH;

[0167] MsgB-RNTI scrambled PDCCH scheduler PDSCH;

[0168] RAR;

[0169] Rollback RAR.

[0170] In some embodiments, the first time length is indicated by first indication information. Exemplarily, the first indication information includes a first information field, which is used to indicate the first time length.

[0171] In some embodiments, the first time length is determined based on parameters indicated by the first indication information. For example, the first time length is determined based on the length of the frequency hopping period included in the first indication information. For instance, the first time length is equal to the length of the frequency hopping period.

[0172] In some embodiments, the first time length is predefined by the protocol. In some embodiments, the first time length may also be preconfigured by the network device.

[0173] In some embodiments, the first time length is determined according to parameters predefined in the protocol. For example, the first time length is determined based on the length of a predefined frequency hopping period. For instance, the first time length is equal to the length of the frequency hopping period.

[0174] In some embodiments, the first time length when the downlink channel or signal is a first downlink channel or signal may be the same as or different from the first time length when the downlink channel or signal is a second downlink channel or signal. For example, the first time length when the downlink channel or signal is a first downlink channel or signal is indicated by the network device through first indication information carried in the MIB, and the first time length when the downlink channel or signal is a second downlink channel or signal is indicated by the network device through first indication information carried in the RAR; the two may have the same or different values.

[0175] Using the above method, the terminal device can flexibly determine the position of the first time window in the time domain, avoid detection and reception during invalid time periods, and save power consumption of the terminal device.

[0176] It should be noted that the first time window in the embodiments of this application can be replaced by a first timer. The start time of the first time window corresponds to the start time of the first timer, and the length of the first time window corresponds to the running time of the first timer, so as to form a new embodiment.

[0177] It should be noted that, in the above method embodiments, the steps executed by the terminal device can be implemented independently as a downlink transmission method on the terminal device side; the steps executed by the network device can be implemented independently as a downlink transmission method on the network device side.

[0178] The following are embodiments of the apparatus described in this application, which can be used to execute the embodiments of the method described in this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the method described in this application.

[0179] Please refer to Figure 10, which shows a block diagram of a downlink transmission apparatus provided in one embodiment of this application. This apparatus has the function of implementing the downlink transmission method example described above. This function can be implemented in hardware or by hardware executing corresponding software. This apparatus can be the terminal device described above, or it can be installed within a terminal device. As shown in Figure 10, the apparatus 1000 may include a receiving module 1010.

[0180] The receiving module 1010 is used to listen to or receive downlink channels or signals within a first time window, the first time window being determined based on a first time length and / or round-trip time (RTT).

[0181] In some embodiments, the downlink channel or signal is one of the following:

[0182] A first downlink channel or signal, the first downlink channel or signal being used to schedule downlink channels or signals carrying a Random Access Response (RAR);

[0183] The second downlink channel or signal is used to schedule downlink channels or signals carrying contention resolution messages.

[0184] In some embodiments, the downlink channel or signal is the first downlink channel or signal, and the start time of the first time window is one of the following:

[0185] The first symbol of the earliest first control resource set CORESET after the last symbol of the random access timing RO of the physical random access channel PRACH and after the first time length.

[0186] The first symbol of the first CORESET after the last symbol of the RO of the PRACH and after at least one symbol plus the first time length;

[0187] The first symbol of the first CORESET after the last symbol of the RO of the PRACH and after the second time length;

[0188] The first symbol of the first CORESET after the last symbol of the RO of the PRACH and after at least one symbol plus the second time length;

[0189] The first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of the PRACH transmission ends and after the first time length has elapsed.

[0190] The first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of the PRACH transmission ends and after at least one symbol has elapsed and the sum of the first time length;

[0191] The first symbol of the earliest first CORESET after the end of the uplink transmission duration corresponding to the RO of the PRACH transmission and after the second time length;

[0192] The first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of the PRACH transmission has ended and after at least one symbol and the sum of the second time length.

[0193] In some embodiments, the first downlink channel or signal includes at least one of the following: a PDCCH scrambled with a Random Access Radio Network Temporary Identifier (RA-RNTI), a PDCCH scrambled with a Message B Radio Network Temporary Identifier (MsgB-RNTI), or a PDCCH scrambled with a Cell Radio Network Temporary Identifier (C-RNTI).

[0194] In some embodiments, the downlink channel or signal is the first downlink channel or signal, and the start time of the first time window is one of the following:

[0195] The transmission timing of the physical uplink shared channel PUSCH corresponding to the RO of PRACH is the first symbol of the earliest first control resource set CORESET after the last symbol of PO and after the first time length.

[0196] The first symbol of the first CORESET after the last symbol of the PO corresponding to the RO of the PRACH and after at least one symbol plus the first time length;

[0197] The first symbol of the first CORESET after the last symbol of the PO corresponding to the RO of the PRACH and after the second time length;

[0198] The first symbol of the first CORESET after the last symbol of the PO corresponding to the RO of the PRACH transmission and after at least one symbol plus the second time length;

[0199] The first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH has ended and after the first time length has elapsed.

[0200] The first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH has ended and after at least one symbol has passed and the sum of the first time length;

[0201] The first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH has ended and after the second time length has elapsed.

[0202] The first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH has ended and after at least one symbol and the sum of the second time length.

[0203] In some embodiments, the first downlink channel or signal includes at least one of the following: a C-RNTI scrambled PDCCH, a MsgB-RNTI scrambled PDCCH; and / or,

[0204] The RAR includes at least one of the following: successful RAR, rollback RAR.

[0205] In some embodiments, the downlink channel or signal is the second downlink channel or signal, and the start time of the first time window is one of the following:

[0206] The first symbol after the end position of the authorized physical uplink shared channel CG-PUSCH transmission and after the first time length;

[0207] The first symbol after the end position of the CG-PUSCH transmission and after the second time length;

[0208] The first symbol after the uplink transmission duration corresponding to CG-PUSCH ends and after the first time length has elapsed;

[0209] The first symbol after the end of the uplink transmission duration corresponding to CG-PUSCH and after the second time length.

[0210] In some embodiments, the second downlink channel or signal includes at least one of the following: a PDCCH scrambled with C-RNTI, or a PDCCH scrambled with a Configuration Grant Radio Network Temporary Identifier (CG-RNTI).

[0211] In some embodiments, the downlink channel or signal is the second downlink channel or signal, and the start time of the first time window is one of the following:

[0212] The first symbol after the end of the transmission of Message 3 Physical Uplink Shared Channel Msg 3 PUSCH and after the first time length;

[0213] Msg 3 is the first symbol after the end of the PUSCH transmission and after the second time length.

[0214] Msg 3 PUSCH corresponds to the first symbol after the uplink transmission duration ends and the first time length has elapsed.

[0215] Msg 3 PUSCH corresponds to the first symbol after the uplink transmission duration has ended and after the second time length has elapsed.

[0216] In some embodiments, the second downlink channel or signal includes at least one of the following: a PDCCH scrambled with a Temporary Cell Radio Network Temporary Identifier (TC-RNTI) or a PDCCH scrambled with a C-RNTI.

[0217] In some embodiments, the first time length is determined based on first indication information, which is carried in at least one of the following:

[0218] RA-RNTI scrambled PDCCH;

[0219] RA-RNTI scrambled PDCCH scheduling PDSCH;

[0220] MsgB-RNTI scrambled PDCCH;

[0221] MsgB-RNTI scrambled PDCCH scheduler PDSCH;

[0222] RAR;

[0223] Rollback RAR.

[0224] In some embodiments, the first time length is determined based on first indication information, which is carried in at least one of the following: Master Message Block (MIB), System Message Block (SIB), Radio Resource Control (RRC), Media Resource Control Unit (MAC CE), Downlink Control Information (DCI), and PDSCH.

[0225] In some embodiments, the first time length is indicated by the first indication information; or,

[0226] The first time length is determined based on the parameters indicated by the first indication information.

[0227] In some embodiments, the first time length is predefined by the protocol; or...

[0228] The first time length is determined according to parameters predefined in the protocol.

[0229] In some embodiments, the uplink transmission duration is one of the following:

[0230] The duration of DRX (Discontinuous Reception Assist) enabled in the cell;

[0231] The duration of the discontinuous DTX transmission enabled by the terminal device.

[0232] In some embodiments, the second time length is determined based on the first time length and / or the RTT duration.

[0233] In some embodiments, the second time length is determined based on the first time length and / or the RTT duration, including at least one of the following:

[0234] The second time length is equal to the maximum value of the first time length and the RTT duration;

[0235] The second time length is K times the first time length, where K is the minimum value that satisfies the condition that the second time length is greater than or equal to the RTT duration;

[0236] The second time length is the sum of the first time length and the RTT duration.

[0237] In some embodiments, the first CORESET is the CORESET corresponding to the Type1-PDCCH CSS configured for the terminal device.

[0238] In some embodiments, the length of the first time window is determined according to at least one of the following parameters: the first time length, the third time length, the first time domain unit, and the number of first time domain units.

[0239] In some embodiments, the third time length includes one of the following: the length of downlink transmission duration, the length of cell DTX activation duration, and the length of terminal device DRX activation duration.

[0240] In some embodiments, the number of the first time domain units and / or the number of the first time domain units is configured by the network device.

[0241] In some embodiments, the unit of the first time length includes one of the following: symbol, time slot, subframe, frame, half-frame, microsecond, millisecond, second.

[0242] In some embodiments, the unit of the first time length is a symbol or a time slot, and the subcarrier spacing SCS corresponding to the first time length is one of the following: the SCS of the synchronization signal block SSB, the SCS of the type 0 physical downlink control channel Type 0-PDCCH, the SCS of the type 1 physical downlink control channel Type 1-PDCCH, the SCS of PRACH, and the SCS of message A MsgA PUSCH.

[0243] In some embodiments, the terminal device operates in a discontinuous reception state; and / or,

[0244] The first time length is related to the time interval between discontinuous receptions by the terminal device.

[0245] The technical solution provided in this application embodiment allows the terminal device to determine a first time window based on a first time length and / or RTT duration, and then listen to or receive downlink channels or signals within the first time window. This avoids the terminal device detecting downlink channels or signals during invalid time periods, thereby saving power consumption of the terminal device and improving the efficiency of the communication system.

[0246] Please refer to Figure 11, which shows a block diagram of a downlink transmission apparatus provided in one embodiment of this application. This apparatus has the function of implementing the downlink transmission method example described above. This function can be implemented in hardware or by hardware executing corresponding software. This apparatus can be the network device described above, or it can be located within a network device. As shown in Figure 11, the apparatus 1100 may include: a transmitting module 1110.

[0247] The transmitting module 1110 is used to transmit a downlink channel or signal, which is monitored or received by the terminal device within a first time window, the first time window being determined based on a first time length and / or round-trip time (RTT).

[0248] In some embodiments, the downlink channel or signal is one of the following:

[0249] A first downlink channel or signal, the first downlink channel or signal being used to schedule downlink channels or signals carrying a Random Access Response (RAR);

[0250] The second downlink channel or signal is used to schedule downlink channels or signals carrying contention resolution messages.

[0251] In some embodiments, the downlink channel or signal is the first downlink channel or signal, and the start time of the first time window is one of the following:

[0252] The terminal device sends the first symbol of the first control resource set CORESET after the last symbol of the random access timing RO of the physical random access channel PRACH and after the first time length.

[0253] The terminal device sends the first symbol of the first CORESET after the last symbol of the RO of PRACH and after at least one symbol plus the first time length.

[0254] The terminal device sends the first symbol of the first CORESET after the last symbol of the RO of PRACH and after a second time length.

[0255] The terminal device sends the first symbol of the earliest first CORESET after the last symbol of the RO of PRACH and after at least one symbol plus the second time length.

[0256] The first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of the PRACH sent by the terminal device ends and after the first time length has elapsed.

[0257] The terminal device sends the first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of PRACH ends and after at least one symbol is added to the first time length.

[0258] The first symbol of the earliest first CORESET after the end of the uplink transmission duration corresponding to the RO of the PRACH sent by the terminal device and after the second time length.

[0259] The terminal device sends the first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of PRACH ends and after at least one symbol and the sum of the second time length.

[0260] In some embodiments, the first downlink channel or signal includes at least one of the following: a PDCCH scrambled with a Random Access Radio Network Temporary Identifier (RA-RNTI), a PDCCH scrambled with a Message B Radio Network Temporary Identifier (MsgB-RNTI), or a PDCCH scrambled with a Cell Radio Network Temporary Identifier (C-RNTI).

[0261] In some embodiments, the downlink channel or signal is the first downlink channel or signal, and the start time of the first time window is one of the following:

[0262] The terminal device transmits the first symbol of the first control resource set CORESET after the last symbol of the physical uplink shared channel PUSCH corresponding to the RO of PRACH and after the first time length.

[0263] The terminal device sends the first symbol of the earliest first CORESET after the last symbol of the PO corresponding to the RO of PRACH and after at least one symbol plus the first time length.

[0264] The terminal device sends the first symbol of the earliest first CORESET after the last symbol of the PO corresponding to the RO of PRACH and after the second time length.

[0265] The terminal device sends the first symbol of the earliest first CORESET after the last symbol of the PO corresponding to the RO of PRACH and after at least one symbol plus the second time length.

[0266] The terminal device sends the first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH ends and after the first time length has elapsed.

[0267] The terminal device sends the first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH ends and after at least one symbol is added to the first time length.

[0268] The terminal device sends the first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH ends and after the second time length has elapsed.

[0269] The terminal device sends the first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH ends and after at least one symbol and the sum of the second time length.

[0270] In some embodiments, the first downlink channel or signal includes at least one of the following: a C-RNTI scrambled PDCCH, a MsgB-RNTI scrambled PDCCH; and / or,

[0271] The RAR includes at least one of the following: successful RAR, rollback RAR.

[0272] In some embodiments, the downlink channel or signal is the second downlink channel or signal, and the start time of the first time window is one of the following:

[0273] The first symbol after the end position of the authorized physical uplink shared channel CG-PUSCH transmission and after the first time length;

[0274] The first symbol after the end position of the CG-PUSCH transmission and after the second time length;

[0275] The first symbol after the uplink transmission duration corresponding to CG-PUSCH ends and after the first time length has elapsed;

[0276] The first symbol after the end of the uplink transmission duration corresponding to CG-PUSCH and after the second time length.

[0277] In some embodiments, the second downlink channel or signal includes at least one of the following: a PDCCH scrambled with C-RNTI, or a PDCCH scrambled with a Configuration Grant Radio Network Temporary Identifier (CG-RNTI).

[0278] In some embodiments, the downlink channel or signal is the second downlink channel or signal, and the start time of the first time window is one of the following:

[0279] The first symbol after the end of the transmission of Message 3 Physical Uplink Shared Channel Msg 3 PUSCH and after the first time length;

[0280] Msg 3 is the first symbol after the end of the PUSCH transmission and after the second time length.

[0281] Msg 3 PUSCH corresponds to the first symbol after the uplink transmission duration ends and the first time length has elapsed.

[0282] Msg 3 PUSCH corresponds to the first symbol after the uplink transmission duration has ended and after the second time length has elapsed.

[0283] In some embodiments, the second downlink channel or signal includes at least one of the following: a PDCCH scrambled with a Temporary Cell Radio Network Temporary Identifier (TC-RNTI) or a PDCCH scrambled with a C-RNTI.

[0284] In some embodiments, the first time length is determined based on first indication information, which is carried in at least one of the following:

[0285] RA-RNTI scrambled PDCCH;

[0286] RA-RNTI scrambled PDCCH scheduling PDSCH;

[0287] MsgB-RNTI scrambled PDCCH;

[0288] MsgB-RNTI scrambled PDCCH scheduler PDSCH;

[0289] RAR;

[0290] Rollback RAR.

[0291] In some embodiments, the first time length is determined based on first indication information, which is carried in at least one of the following: Master Message Block (MIB), System Message Block (SIB), Radio Resource Control (RRC), Media Resource Control Unit (MAC CE), Downlink Control Information (DCI), and PDSCH.

[0292] In some embodiments, the first time length is indicated by the first indication information; or,

[0293] The first time length is determined based on the parameters indicated by the first indication information.

[0294] In some embodiments, the first time length is predefined by the protocol; or...

[0295] The first time length is determined according to parameters predefined in the protocol.

[0296] In some embodiments, the uplink transmission duration is one of the following:

[0297] The duration of DRX (Discontinuous Reception Assist) enabled in the cell;

[0298] The duration of discontinuous DTX transmission enabled by the terminal device.

[0299] In some embodiments, the second time length is determined based on the first time length and / or the RTT duration.

[0300] In some embodiments, the second time length is determined based on the first time length and / or the RTT duration, including at least one of the following:

[0301] The second time length is equal to the maximum value of the first time length and the RTT duration;

[0302] The second time length is K times the first time length, where K is the minimum value that satisfies the condition that the second time length is greater than or equal to the RTT duration;

[0303] The second time length is the sum of the first time length and the RTT duration.

[0304] In some embodiments, the first CORESET is the CORESET corresponding to the Type1-PDCCH CSS configured for the terminal device.

[0305] In some embodiments, the length of the first time window is determined according to at least one of the following parameters: the first time length, the third time length, the first time domain unit, and the number of first time domain units.

[0306] In some embodiments, the third time length includes one of the following: the length of downlink transmission duration, the length of cell DTX activation duration, and the length of terminal device DRX activation duration.

[0307] In some embodiments, the number of the first time domain units and / or the number of the first time domain units is configured by the network device.

[0308] In some embodiments, the unit of the first time length includes one of the following: symbol, time slot, subframe, frame, half-frame, microsecond, millisecond, second.

[0309] In some embodiments, the unit of the first time length is a symbol or a time slot, and the subcarrier spacing SCS corresponding to the first time length is one of the following: the SCS of the synchronization signal block SSB, the SCS of the type 0 physical downlink control channel Type 0-PDCCH, the SCS of the type 1 physical downlink control channel Type 1-PDCCH, the SCS of PRACH, and the SCS of message A MsgA PUSCH.

[0310] In some embodiments, the terminal device operates in a discontinuous reception state; and / or,

[0311] The first time length is related to the time interval between discontinuous receptions by the terminal device.

[0312] The technical solution provided in this application embodiment allows the terminal device to determine a first time window based on a first time length and / or RTT duration, and then listen to or receive downlink channels or signals within the first time window. This avoids the terminal device detecting downlink channels or signals during invalid time periods, thereby saving power consumption of the terminal device and improving the efficiency of the communication system.

[0313] It should be noted that the device provided in the above embodiments is only illustrated by the division of the above functional modules when implementing its functions. In actual applications, the above functions can be assigned to different functional modules according to actual needs, that is, the content structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0314] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0315] Please refer to Figure 12, which shows a schematic diagram of the structure of a communication device provided in one embodiment of this application. The communication device can be a terminal device or a network device as described above. The communication device 1200 may include: a processor 1201, a transceiver 1202, and a memory 1203. The transceiver 1202 is used to implement sending or receiving functions, such as implementing the functions of the receiving module 1010 described above, or implementing the functions of the sending module 1110 described above. The processor 1201 can be used to implement other processing functions or control sending and / or receiving.

[0316] The processor 1201 includes one or more processing cores. The processor 1201 executes various functional applications and information processing by running software programs and modules.

[0317] The transceiver 1202 may include a receiver and a transmitter. For example, the receiver and transmitter may be implemented as the same wireless communication component, which may include a wireless communication chip and a radio frequency antenna.

[0318] The memory 1203 can be connected to the processor 1201 and the transceiver 1202.

[0319] The memory 1203 can be used to store a computer program executed by the processor, and the processor 1201 is used to execute the computer program to implement the various steps in the above method embodiments.

[0320] In some embodiments, when the communication device 1200 is a terminal device, the transceiver 1202 is used to listen to or receive downlink channels or signals within a first time window, the first time window being determined based on a first time length and / or round-trip time (RTT).

[0321] In some embodiments, when the communication device 1200 is a network device, the transceiver 1202 is used to transmit downlink channels or signals, which are listened to or received by the terminal device within a first time window, the first time window being determined based on a first time length and / or round-trip time (RTT).

[0322] For details not described in this embodiment, please refer to the embodiments above, which will not be repeated here.

[0323] Furthermore, the memory can be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: magnetic disks or optical disks, electrically erasable programmable read-only memory, erasable programmable read-only memory, statically accessible memory, read-only memory, magnetic memory, flash memory, and programmable read-only memory.

[0324] This application embodiment also provides a computer-readable storage medium storing a computer program for execution by a processor to implement the downlink transmission method on the terminal device side or the downlink transmission method on the network device side. Optionally, the computer-readable storage medium may include ROM (Read-Only Memory), RAM (Random-Access Memory), SSD (Solid State Drives), or optical disc, etc. The random access memory may include ReRAM (Resistance Random Access Memory) and DRAM (Dynamic Random Access Memory).

[0325] This application also provides a chip, which includes programmable logic circuits and / or program instructions. When the chip is running, it is used to implement the downlink transmission method on the terminal device side or the downlink transmission method on the network device side.

[0326] This application also provides a computer program product, which includes a computer program stored in a computer-readable storage medium. A processor reads and executes the computer program from the computer-readable storage medium to implement the downlink transmission method on the terminal device side or the downlink transmission method on the network device side.

[0327] It should be understood that the term "instruction" mentioned in the embodiments of this application can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0328] In the description of the embodiments of this application, the term "correspondence" may indicate that there is a direct or indirect correspondence between two things, or that there is an association between two things, or that there is a relationship of instruction and being instructed, configuration and being configured, etc.

[0329] In some embodiments of this application, "predefined" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and APs). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

[0330] In some embodiments of this application, the term "protocol" may refer to standard protocols in the field of communications, such as LTE protocols, NR protocols, and related protocols applied in future communication systems. This application does not limit the scope of these protocols.

[0331] In this article, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0332] In this article, "greater than or equal to" can mean greater than or equal to, and "less than or equal to" can mean less than or equal to.

[0333] Furthermore, the step numbers described herein are merely illustrative of one possible execution order between steps. In some other embodiments, the steps may not be executed in the order of their numbers, such as two steps with different numbers being executed simultaneously, or two steps with different numbers being executed in the reverse order of the illustration. This application does not limit this.

[0334] Those skilled in the art will recognize that the functions described in the embodiments of this application in one or more of the above examples can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transfer of a computer program from one place to another. Storage media can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0335] The above description is merely an exemplary embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A downlink transmission method, characterized in that, The method is executed by a terminal device, and the method includes: Within a first time window, listen to or receive downlink channels or signals, the first time window being determined based on a first time length and / or round-trip time (RTT).

2. The method according to claim 1, characterized in that, The downlink channel or signal is one of the following: A first downlink channel or signal, the first downlink channel or signal being used to schedule downlink channels or signals carrying a Random Access Response (RAR); The second downlink channel or signal is used to schedule downlink channels or signals carrying contention resolution messages.

3. The method according to claim 2, characterized in that, The downlink channel or signal is the first downlink channel or signal, and the start time of the first time window is one of the following: The first symbol of the earliest first control resource set CORESET after the last symbol of the random access timing RO of the physical random access channel PRACH and after the first time length. The first symbol of the first CORESET after the last symbol of the RO of the PRACH and after at least one symbol plus the first time length; The first symbol of the first CORESET after the last symbol of the RO of the PRACH and after the second time length; The first symbol of the first CORESET after the last symbol of the RO of the PRACH and after at least one symbol plus the second time length; The first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of the PRACH transmission ends and after the first time length has elapsed. The first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of the PRACH transmission has ended and after at least one symbol has passed and the sum of the first time length; The first symbol of the earliest first CORESET after the end of the uplink transmission duration corresponding to the RO of the PRACH transmission and after the second time length; The first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of the PRACH transmission has ended and after at least one symbol and the sum of the second time length.

4. The method according to claim 3, characterized in that, The first downlink channel or signal includes at least one of the following: a PDCCH scrambled with the Random Access Radio Network Temporary Identifier RA-RNTI, a PDCCH scrambled with the Message B Radio Network Temporary Identifier MsgB-RNTI, or a PDCCH scrambled with the Cell Radio Network Temporary Identifier C-RNTI.

5. The method according to claim 2, characterized in that, The downlink channel or signal is the first downlink channel or signal, and the start time of the first time window is one of the following: The transmission timing of the physical uplink shared channel PUSCH corresponding to the RO of PRACH is the first symbol of the earliest first control resource set CORESET after the last symbol of PO and after the first time length. The first symbol of the first CORESET after the last symbol of the PO corresponding to the RO of the PRACH and after at least one symbol plus the first time length; The first symbol of the first CORESET after the last symbol of the PO corresponding to the RO of the PRACH and after the second time length; The first symbol of the first CORESET after the last symbol of the PO corresponding to the RO of the PRACH transmission and after at least one symbol plus the second time length; The first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH has ended and after the first time length has elapsed. The first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH has ended and after at least one symbol has passed and the sum of the first time length; The first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH has ended and after the second time length has elapsed. The first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH has ended and after at least one symbol and the sum of the second time length.

6. The method according to claim 5, characterized in that, The first downlink channel or signal includes at least one of the following: a C-RNTI scrambled PDCCH, a MsgB-RNTI scrambled PDCCH; and / or, The RAR includes at least one of the following: successful RAR, rollback RAR.

7. The method according to claim 2, characterized in that, The downlink channel or signal is the second downlink channel or signal, and the start time of the first time window is one of the following: The first symbol after the end position of the authorized physical uplink shared channel CG-PUSCH transmission and after the first time length; The first symbol after the end position of the CG-PUSCH transmission and after the second time length; The first symbol after the uplink transmission duration corresponding to CG-PUSCH ends and after the first time length has elapsed; The first symbol after the end of the uplink transmission duration corresponding to CG-PUSCH and after the second time length.

8. The method according to claim 7, characterized in that, The second downlink channel or signal includes at least one of the following: a PDCCH scrambled with C-RNTI, or a PDCCH scrambled with a Configuration Grant Radio Network Temporary Identifier (CG-RNTI).

9. The method according to claim 2, characterized in that, The downlink channel or signal is the second downlink channel or signal, and the start time of the first time window is one of the following: The first symbol after the end of the transmission of Message 3 Physical Uplink Shared Channel Msg 3 PUSCH and after the first time length; Msg 3 is the first symbol after the end of the PUSCH transmission and after the second time length. Msg 3 PUSCH corresponds to the first symbol after the uplink transmission duration ends and the first time length has elapsed. Msg 3 PUSCH corresponds to the first symbol after the uplink transmission duration has ended and after the second time length has elapsed.

10. The method according to claim 9, characterized in that, The second downlink channel or signal includes at least one of the following: a PDCCH scrambled with the Temporary Cell Radio Network Temporary Identifier TC-RNTI, or a PDCCH scrambled with C-RNTI.

11. The method according to claim 9 or 10, characterized in that, The first time length is determined based on first indication information, which is carried in at least one of the following: RA-RNTI scrambled PDCCH; RA-RNTI scrambled PDCCH scheduling PDSCH; MsgB-RNTI scrambled PDCCH; MsgB-RNTI scrambled PDCCH scheduler PDSCH; RAR; Rollback RAR.

12. The method according to any one of claims 1 to 10, characterized in that, The first time length is determined based on the first indication information, which is carried in at least one of the following: Master Message Block (MIB), System Message Block (SIB), Radio Resource Control (RRC), Media Resource Control Unit (MAC CE), Downlink Control Information (DCI), and PDSCH.

13. The method according to claim 11 or 12, characterized in that, The first time length is indicated by the first indication information; or, The first time length is determined based on the parameters indicated by the first indication information.

14. The method according to any one of claims 1 to 10, characterized in that, The first time length is predefined by the protocol; or, The first time length is determined according to parameters predefined in the protocol.

15. The method according to any one of claims 3 to 11, characterized in that, The uplink transmission duration is one of the following: The duration of DRX (Discontinuous Reception Assist) enabled in the cell; The duration of the discontinuous DTX transmission enabled by the terminal device.

16. The method according to any one of claims 3 to 11, characterized in that, The second time length is determined based on the first time length and / or the RTT duration.

17. The method according to claim 16, characterized in that, The second time length is determined based on the first time length and / or the RTT duration, including at least one of the following: The second time length is equal to the maximum value of the first time length and the RTT duration; The second time length is K times the first time length, where K is the minimum value that satisfies the condition that the second time length is greater than or equal to the RTT duration; The second time length is the sum of the first time length and the RTT duration.

18. The method according to any one of claims 3 to 6, characterized in that, The first CORESET is the CORESET corresponding to the Type1-PDCCH CSS configured on the terminal device.

19. The method according to any one of claims 1 to 18, characterized in that, The length of the first time window is determined according to at least one of the following parameters: the first time length, the third time length, the first time domain unit, and the number of first time domain units.

20. The method according to claim 19, characterized in that, The third time length includes one of the following: the length of downlink transmission duration, the length of cell DTX activation duration, and the length of terminal device DRX activation duration.

21. The method according to claim 19 or 20, characterized in that, The first time domain unit and / or the number of the first time domain units are configured by the network device.

22. The method according to any one of claims 1 to 21, characterized in that, The unit of the first time length includes one of the following: symbol, time slot, subframe, frame, half-frame, microsecond, millisecond, second.

23. The method according to claim 22, characterized in that, The unit of the first time length is a symbol or a time slot, and the subcarrier spacing SCS corresponding to the first time length is one of the following: the SCS of the synchronization signal block SSB, the SCS of the type 0 physical downlink control channel Type 0-PDCCH, the SCS of the type 1 physical downlink control channel Type 1-PDCCH, the SCS of PRACH, and the SCS of message A MsgA PUSCH.

24. The method according to any one of claims 1 to 23, characterized in that, The terminal device operates in a discontinuous reception state; and / or, The first time length is related to the time interval between discontinuous receptions by the terminal device.

25. A downlink transmission method, characterized in that, The method is performed by a network device, and the method includes: A downlink channel or signal is transmitted, which is monitored or received by the terminal device within a first time window, the first time window being determined based on a first time length and / or round-trip time (RTT).

26. The method according to claim 25, characterized in that, The downlink channel or signal is one of the following: A first downlink channel or signal, the first downlink channel or signal being used to schedule downlink channels or signals carrying a Random Access Response (RAR); The second downlink channel or signal is used to schedule downlink channels or signals carrying contention resolution messages.

27. The method according to claim 26, characterized in that, The downlink channel or signal is the first downlink channel or signal, and the start time of the first time window is one of the following: The terminal device sends the first symbol of the first control resource set CORESET after the last symbol of the random access timing RO of the physical random access channel PRACH and after the first time length. The terminal device sends the first symbol of the first CORESET after the last symbol of the RO of PRACH and after at least one symbol plus the first time length. The terminal device sends the first symbol of the first CORESET after the last symbol of the RO of PRACH and after a second time length. The terminal device sends the first symbol of the earliest first CORESET after the last symbol of the RO of PRACH and after at least one symbol plus the second time length. The first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of the PRACH sent by the terminal device ends and after the first time length has elapsed. The terminal device sends the first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of PRACH ends and after at least one symbol is added to the first time length. The first symbol of the earliest first CORESET after the end of the uplink transmission duration corresponding to the RO of the PRACH sent by the terminal device and after the second time length. The terminal device sends the first symbol of the earliest first CORESET after the uplink transmission duration corresponding to the RO of PRACH ends and after at least one symbol and the sum of the second time length.

28. The method according to claim 27, characterized in that, The first downlink channel or signal includes at least one of the following: a PDCCH scrambled with the Random Access Radio Network Temporary Identifier RA-RNTI, a PDCCH scrambled with the Message B Radio Network Temporary Identifier MsgB-RNTI, or a PDCCH scrambled with the Cell Radio Network Temporary Identifier C-RNTI.

29. The method according to claim 26, characterized in that, The downlink channel or signal is the first downlink channel or signal, and the start time of the first time window is one of the following: The terminal device transmits the first symbol of the first control resource set CORESET after the last symbol of the physical uplink shared channel PUSCH corresponding to the RO of PRACH and after the first time length. The terminal device sends the first symbol of the earliest first CORESET after the last symbol of the PO corresponding to the RO of PRACH and after at least one symbol plus the first time length. The terminal device sends the first symbol of the earliest first CORESET after the last symbol of the PO corresponding to the RO of PRACH and after the second time length. The terminal device sends the first symbol of the earliest first CORESET after the last symbol of the PO corresponding to the RO of PRACH and after at least one symbol plus the second time length. The terminal device sends the first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH ends and after the first time length has elapsed. The terminal device sends the first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH ends and after at least one symbol is added to the first time length. The terminal device sends the first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH ends and after the second time length has elapsed. The terminal device sends the first symbol of the earliest first CORESET after the uplink transmission duration of the RO corresponding to the PO corresponding to the PRACH ends and after at least one symbol and the sum of the second time length.

30. The method according to claim 29, characterized in that, The first downlink channel or signal includes at least one of the following: a C-RNTI scrambled PDCCH, a MsgB-RNTI scrambled PDCCH; and / or, The RAR includes at least one of the following: successful RAR, rollback RAR.

31. The method according to claim 26, characterized in that, The downlink channel or signal is the second downlink channel or signal, and the start time of the first time window is one of the following: The first symbol after the end position of the authorized physical uplink shared channel CG-PUSCH transmission and after the first time length; The first symbol after the end position of the CG-PUSCH transmission and after the second time length; The first symbol after the uplink transmission duration corresponding to CG-PUSCH ends and after the first time length has elapsed; The first symbol after the end of the uplink transmission duration corresponding to CG-PUSCH and after the second time length.

32. The method according to claim 31, characterized in that, The second downlink channel or signal includes at least one of the following: a PDCCH scrambled with C-RNTI, or a PDCCH scrambled with a Configuration Grant Radio Network Temporary Identifier (CG-RNTI).

33. The method according to claim 26, characterized in that, The downlink channel or signal is the second downlink channel or signal, and the start time of the first time window is one of the following: The first symbol after the end of the transmission of Message 3 Physical Uplink Shared Channel Msg 3 PUSCH and after the first time length; Msg 3 is the first symbol after the end of the PUSCH transmission and after the second time length. Msg 3 PUSCH corresponds to the first symbol after the uplink transmission duration ends and the first time length has elapsed. Msg 3 PUSCH corresponds to the first symbol after the uplink transmission duration has ended and after the second time length has elapsed.

34. The method according to claim 33, characterized in that, The second downlink channel or signal includes at least one of the following: a PDCCH scrambled with the Temporary Cell Radio Network Temporary Identifier TC-RNTI, or a PDCCH scrambled with C-RNTI.

35. The method according to claim 33 or 34, characterized in that, The first time length is determined based on first indication information, which is carried in at least one of the following: RA-RNTI scrambled PDCCH; RA-RNTI scrambled PDCCH scheduling PDSCH; MsgB-RNTI scrambled PDCCH; MsgB-RNTI scrambled PDCCH scheduler PDSCH; RAR; Rollback RAR.

36. The method according to any one of claims 25 to 34, characterized in that, The first time length is determined based on the first indication information, which is carried in at least one of the following: Master Message Block (MIB), System Message Block (SIB), Radio Resource Control (RRC), Media Resource Control Unit (MAC CE), Downlink Control Information (DCI), and PDSCH.

37. The method according to claim 35 or 36, characterized in that, The first time length is indicated by the first indication information; or, The first time length is determined based on the parameters indicated by the first indication information.

38. The method according to any one of claims 25 to 34, characterized in that, The first time length is predefined by the protocol; or, The first time length is determined according to parameters predefined in the protocol.

39. The method according to any one of claims 27 to 35, characterized in that, The uplink transmission duration is one of the following: The duration of DRX (Discontinuous Reception Assist) enabled in the cell; The duration of discontinuous DTX transmission enabled by the terminal device.

40. The method according to any one of claims 27 to 35, characterized in that, The second time length is determined based on the first time length and / or the RTT duration.

41. The method according to claim 40, characterized in that, The second time length is determined based on the first time length and / or the RTT duration, including at least one of the following: The second time length is equal to the maximum value of the first time length and the RTT duration; The second time length is K times the first time length, where K is the minimum value that satisfies the condition that the second time length is greater than or equal to the RTT duration; The second time length is the sum of the first time length and the RTT duration.

42. The method according to any one of claims 27 to 30, characterized in that, The first CORESET is the CORESET corresponding to the Type1-PDCCH CSS configured on the terminal device.

43. The method according to any one of claims 25 to 42, characterized in that, The length of the first time window is determined according to at least one of the following parameters: the first time length, the third time length, the first time domain unit, and the number of first time domain units.

44. The method according to claim 43, characterized in that, The third time length includes one of the following: the length of downlink transmission duration, the length of cell DTX activation duration, and the length of terminal device DRX activation duration.

45. The method according to claim 43 or 44, characterized in that, The first time domain unit and / or the number of the first time domain units are configured by the network device.

46. ​​The method according to any one of claims 25 to 45, characterized in that, The unit of the first time length includes one of the following: symbol, time slot, subframe, frame, half-frame, microsecond, millisecond, second.

47. The method according to claim 46, characterized in that, The unit of the first time length is a symbol or a time slot, and the subcarrier spacing SCS corresponding to the first time length is one of the following: the SCS of the synchronization signal block SSB, the SCS of the type 0 physical downlink control channel Type 0-PDCCH, the SCS of the type 1 physical downlink control channel Type 1-PDCCH, the SCS of PRACH, and the SCS of message A MsgA PUSCH.

48. The method according to any one of claims 25 to 47, characterized in that, The terminal device operates in a discontinuous reception state; and / or, The first time length is related to the time interval between discontinuous receptions by the terminal device.

49. A downlink transmission device, characterized in that, The device includes: The receiving module is used to listen to or receive downlink channels or signals within a first time window, the first time window being determined based on a first time length and / or round-trip time (RTT).

50. A downlink transmission device, characterized in that, The device includes: The transmitting module is used to transmit downlink channels or signals, which are monitored or received by the terminal device within a first time window, the first time window being determined based on a first time length and / or round-trip time (RTT).

51. A communication device, characterized in that, The communication device includes a processor and a memory, the memory storing a computer program, the processor executing the computer program to implement the method as claimed in any one of claims 1 to 24, or to implement the method as claimed in any one of claims 25 to 48.

52. A computer-readable storage medium, characterized in that, The storage medium stores a computer program that is executed by a processor to implement the method as described in any one of claims 1 to 24, or to implement the method as described in any one of claims 25 to 48.

53. A chip, characterized in that, The chip includes programmable logic circuitry and / or program instructions, which, when the chip is running, are used to implement the method as described in any one of claims 1 to 24, or to implement the method as described in any one of claims 25 to 48.

54. A computer program product, characterized in that, The computer program product includes computer instructions stored in a computer-readable storage medium, which a processor reads from and executes to implement the method as claimed in any one of claims 1 to 24, or the method as claimed in any one of claims 25 to 48.

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