Communication method, device, equipment, storage medium, chip, product and program

Abstract

Provided in an embodiment of the present application are a communication method, apparatus, device, storage medium, chip, product and program, the method comprising: a terminal device determining a resource and / or a preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or whether the terminal device supports blind scheduling retransmission grant monitoring of Msg3 (S801).

Description

Communication method, device, equipment, storage medium, chip, product and program Technical Field

[0001] The embodiments of the present application relate to the field of mobile communication technologies, and specifically to a communication method, apparatus, device, storage medium, chip, product, and program. Background Art

[0002] The terminal device can support two random access modes: contention-based random access mode and non-contention-based random access mode. How the terminal device determines random access resources and / or preamble during the random access process has always been a concern in the field.

[0003] Summary of the Invention

[0004] Embodiments of the present application provide a communication method, apparatus, device, storage medium, chip, product, and program.

[0005] In a first aspect, an embodiment of the present application provides a communication method, the method comprising:

[0006] The terminal device determines the resources and / or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3.

[0007] In a second aspect, an embodiment of the present application provides a communication method, the method comprising:

[0008] The network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 based on the resources and / or preamble corresponding to the received Msg1.

[0009] In a third aspect, an embodiment of the present application provides a communication device, including:

[0010] The determining unit is configured to determine resources and / or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission authorization grant monitoring of Msg3.

[0011] In a fourth aspect, an embodiment of the present application provides a communication device, including:

[0012] The determination unit is used to determine whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission authorization grant monitoring of Msg3 based on the resources and / or preamble corresponding to the received Msg1.

[0013] In a fifth aspect, an embodiment of the present application provides a communication device, including: a processor and a memory,

[0014] The memory is used to store computer programs,

[0015] The processor is used to call and run the computer program stored in the memory, so that the terminal device executes the method described in the first aspect or the network device executes the method described in the second aspect.

[0016] In a sixth aspect, an embodiment of the present application provides a computer storage medium, which stores one or more programs, and the one or more programs can be executed by one or more processors to implement the method described in the first aspect or the second aspect.

[0017] In a seventh aspect, an embodiment of the present application provides a chip, comprising: a processor, configured to call and run a computer program from a memory to execute the method described in the first aspect or the second aspect.

[0018] In an eighth aspect, an embodiment of the present application provides a computer program product, comprising a computer storage medium, wherein the computer storage medium stores a computer program, wherein the computer program comprises instructions that can be executed by at least one processor, and when the instructions are executed by the at least one processor, the method described in the first aspect or the second aspect is implemented.

[0019] In a ninth aspect, an embodiment of the present application provides a computer program, which enables a computer to execute the method described in the first aspect or the second aspect.

[0020] In an embodiment of the present application, a terminal device determines the resources and / or preamble for sending Msg1 based on whether the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of grant for blind scheduling retransmission of Msg3. In this way, the terminal device can indicate to the network device whether it supports blind scheduling retransmission of Msg3 or monitoring of grant for blind scheduling retransmission of Msg3 through the set resources and / or preamble, thereby facilitating the network device to make scheduling decisions based on the terminal device's support for blind scheduling retransmission of Msg3 or monitoring of grant for blind scheduling retransmission of Msg3, thereby facilitating improving the efficiency of resource scheduling by the network device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] FIG1 is a schematic diagram of an application scenario of an embodiment of the present application;

[0023] FIG2 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

[0024] FIG3 is a schematic diagram of the architecture of another communication system provided in an embodiment of the present application;

[0025] FIG4 is a schematic diagram of an NTN scenario based on a transparent transmission satellite according to an embodiment of the present application;

[0026] FIG5 is a schematic diagram of an NTN scenario based on a regenerative forwarding satellite according to an embodiment of the present application;

[0027] FIG6 is a schematic diagram of a process of random access based on contention provided in an embodiment of the present application;

[0028] FIG7 is a schematic diagram of a flow chart of a non-contention-based random access process provided in an embodiment of the present application;

[0029] FIG8 is a flow chart of a communication method provided in an embodiment of the present application;

[0030] FIG9 is a flow chart of another communication method provided in an embodiment of the present application;

[0031] FIG10 is a flow chart of another communication method provided in an embodiment of the present application;

[0032] FIG11 is a flow chart of another communication method provided in an embodiment of the present application;

[0033] FIG12 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0034] FIG13 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application;

[0035] FIG14 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0036] FIG15 is a schematic structural diagram of a chip according to an embodiment of the present application. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The technical solutions recorded in the embodiments of the present application can be combined arbitrarily unless there is a conflict. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In the embodiments of the present application, unless otherwise specified, "information" and "message" can be understood in the same way. In the embodiments of the present application, "the method also includes" can represent a supplement to the method in any of the above embodiments, or it can be an embodiment of a separate communication method.

[0038] FIG1 is a schematic diagram of an application scenario of an embodiment of the present application. As shown in FIG1 , a communication system 100 may include a terminal device 110 and a network device 120. The network device 120 may communicate with the terminal device 110 via an air interface. The terminal device 110 and the network device 120 support multi-service transmission.

[0039] It should be understood that the embodiments of the present application are only illustrative of the communication system 100, but the embodiments of the present application are not limited thereto. That is, the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Long Term Evolution (LTE) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Internet of Things (IoT) system, Narrow Band Internet of Things (NB-IoT) system, enhanced Machine-Type Communications (eMTC) system, 5G communication system (also known as New Radio (NR) communication system), or future communication systems (such as 6G, 7G, etc.).

[0040] 1 , the network device 120 may include an access network device 121 for communicating with the terminal device 110. The access network device 121 may provide communication coverage for a specific geographical area and may communicate with the terminal device 110 within the coverage area.

[0041] The terminal device in this application can be a device with wireless communication capabilities, which can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on the water (such as ships, etc.); can also be deployed in the air (for example, on airplanes, balloons, and satellites, etc.). The terminal device in this application can be called user equipment (UE), mobile station (MS), mobile terminal (MT), subscriber unit, subscriber station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device. The terminal device may include one of the following or a combination of at least two: Internet of Things (IoT) devices, satellite terminals, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, servers, mobile phones, tablet computers, computers with wireless transceiver capabilities, handheld computers, desktop computers, personal digital assistants, portable media players, smart speakers, navigation devices, smart watches, smart glasses, smart necklaces and other wearable devices, pedometers, digital TVs, Virtual Reality (VR) terminal devices, Augmented Reality (AR) terminal devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes. The wireless terminals in the Internet of Vehicles (IoV) and the vehicles, on-board equipment, on-board modules, wireless modems, handheld devices, customer premises equipment (CPE), and smart home appliances in the IoV system.

[0042] The network device 120 in the embodiment of the present application may include an access network device 121 and / or a core network device 122 .

[0043] The access network device 121 may include one of the following or a combination of at least two: an evolved base station (eNB or eNodeB) in a Long Term Evolution (LTE) system, a next generation radio access network (NG RAN) device, a base station (gNB) in an NR system, a small station, a micro station, a wireless controller in a cloud radio access network (CRAN), a wireless fidelity (Wi-Fi) access point, a transmission reception point (TRP), a relay station, an access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a network device in a future evolved public land mobile network (PLMN), etc.

[0044] The core network device 122 can be a 5G core network (5G Core, 5GC) device. The core network device 122 can include one of the following or a combination of at least two: Access and Mobility Management Function (AMF), Authentication Server Function (AUSF), User Plane Function (UPF), Session Management Function (SMF), and Location Management Function (LMF). In other embodiments, the core network device can also be an Evolved Packet Core (EPC) device of the LTE network, for example, a Session Management Function + Core Packet Gateway (SMF+PGW-C) device. It should be understood that SMF+PGW-C can simultaneously implement the functions that SMF and PGW-C can implement. During the network evolution process, the above-mentioned core network device 122 may also be called other names, or a new network entity may be formed by dividing the functions of the core network, which is not limited in this embodiment of the present application.

[0045] The terminal device 110 may be any terminal device, including but not limited to a terminal device connected to the network device 120 or other terminal devices by wire or wireless connection.

[0046] The terminal device 110 can be used for device-to-device (D2D) communication.

[0047] The functional units in the communication system 100 may also establish connections and implement communication via next generation (NG) network interfaces.

[0048] For example, the terminal device establishes an air interface connection with the access network device through the NR interface for transmitting user plane data and control plane signaling; the terminal device can establish a control plane signaling connection with the AMF through the NG interface 1 (referred to as N1); the access network device, such as the next generation wireless access base station (gNB), can establish a user plane data connection with the UPF through the NG interface 3 (referred to as N3); the access network device can establish a control plane signaling connection with the AMF through the NG interface 2 (referred to as N2); the UPF can establish a control plane signaling connection with the SMF through the NG interface 4 (referred to as N4); the UPF can exchange user plane data with the data network through the NG interface 6 (referred to as N6); the AMF can establish a control plane signaling connection with the SMF through the NG interface 11 (referred to as N11); the SMF can establish a control plane signaling connection with the PCF through the NG interface 7 (referred to as N7).

[0049] Figure 1 exemplarily shows a base station, a core network device and two terminal devices. In some embodiments, the wireless communication system 100 may include multiple base station devices and each base station may include other numbers of terminal devices within its coverage area, which is not limited in this embodiment of the present application.

[0050] 3GPP is researching Non-Terrestrial Network (NTN) technology. NTNs typically use satellite communications to provide communications services to terrestrial users. Compared to terrestrial cellular networks, satellite communications offer many unique advantages. First, satellite communications are not restricted by user location. For example, conventional terrestrial communications cannot cover areas such as oceans, high mountains, and deserts where communications equipment cannot be deployed or where there is a sparse population. However, satellite communications, because a single satellite can cover a large area and orbits the Earth, theoretically every corner of the globe can be covered. Second, satellite communications have significant social value. Satellite communications can provide low-cost coverage in remote mountainous areas and poor, underdeveloped countries or regions, enabling people in these areas to enjoy advanced voice communications and mobile internet technologies, helping to narrow the digital divide with developed regions and promoting their development. Third, satellite communications offer long range, and increasing communication distance does not significantly increase communication costs. Finally, satellite communications are highly stable and unaffected by natural disasters. Optionally, the network equipment in NTNs can include satellites.

[0051] NTN technology can be combined with various communication systems. For example, NTN technology can be combined with the NR system to form an NR-NTN system. Another example is that NTN technology can be combined with the Internet of Things (IoT) system to form an IoT-NTN system. IoT-NTN systems can include NB-IoT-NTN systems and eMTC-NTN systems.

[0052] FIG2 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application. As shown in FIG2 , the system includes a terminal device 201 and a satellite 202, and wireless communication can be performed between the terminal device 201 and the satellite 202. The network formed between the terminal device 201 and the satellite 202 can also be referred to as an NTN. In the architecture of the communication system shown in FIG2 , the satellite 202 can have the function of a base station, and the terminal device 201 and the satellite 202 can communicate directly. In the system architecture, the satellite 202 can be referred to as a network device. In some embodiments of the present application, the communication system may include multiple network devices 202, and each network device 202 may include a different number of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0053] FIG3 is a schematic diagram of the architecture of another communication system provided in an embodiment of the present application. As shown in FIG3 , the system includes a terminal device 301, a satellite 302, and a base station 303. Wireless communication can be performed between the terminal device 301 and the satellite 302, and communication can be performed between the satellite 302 and the base station 303. The network formed between the terminal device 301, the satellite 302, and the base station 303 can also be referred to as an NTN. In the architecture of the communication system shown in FIG3 , the satellite 302 may not have the function of a base station, and the communication between the terminal device 301 and the base station 303 needs to be relayed through the satellite 302. In this system architecture, the base station 303 can be referred to as a network device. In some embodiments of the present application, the communication system may include multiple network devices 303, and each network device 303 may include a different number of terminal devices within its coverage area, which is not limited in the embodiments of the present application. The network device 303 may be the network device 120 in FIG1 .

[0054] It should be understood that the satellites 202 or 302 include, but are not limited to, low-Earth orbit (LEO) satellites, medium-Earth orbit (MEO) satellites, geostationary Earth orbit (GEO) satellites, and high elliptical orbit (HEO) satellites. Satellites can use multiple beams to cover the ground. For example, a satellite can form dozens or even hundreds of beams to cover the ground. In other words, a satellite beam can cover a ground area with a diameter of tens to hundreds of kilometers, thereby ensuring satellite coverage and improving the system capacity of the entire satellite communication system.

[0055] For example, LEO satellites can have an altitude range of 500 km to 1500 km, with an orbital period of approximately 1.5 to 2 hours. The signal propagation delay for single-hop communication between users is generally less than 20 milliseconds, and the maximum satellite visibility time is 20 minutes. LEO satellites have short signal propagation distances and low link loss, requiring low transmit power from terminal devices. GEO satellites can have an orbital altitude of 35,786 km and a rotation period around the Earth of 24 hours. The signal propagation delay for single-hop communication between users is generally 250 milliseconds.

[0056] In order to ensure satellite coverage and improve the system capacity of the entire satellite communication system, satellites use multiple beams to cover the ground. A satellite can form dozens or even hundreds of beams to cover the ground; a satellite beam can cover a ground area with a diameter of tens to hundreds of kilometers.

[0057] It should be noted that Figures 1 to 3 illustrate the systems to which this application applies only by way of example. The methods described in the embodiments of this application are also applicable to other systems. Furthermore, the terms "system" and "network" are often used interchangeably herein. The term "and / or" herein simply describes an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " generally indicates that the associated objects are in an "or" relationship. It should also be understood that the term "indication" in the embodiments of this application can be direct, indirect, or indicate an associated relationship. For example, "A indicates B" can mean that A directly indicates B, for example, B can obtain information through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can obtain information through C; or it can mean that A and B have an associated relationship. It should also be understood that the term "corresponding" in the embodiments of this application can mean that two objects have a direct or indirect correspondence relationship, an associated relationship, or a relationship between an indicator and the indicated, a configuration and the configured, and so on. It should also be understood that the “predefined”, “protocol agreement”, “predetermined” or “predefined rules” mentioned in the embodiments of the present application can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in devices (for example, including terminal devices and network devices). This application does not limit its specific implementation method. For example, predefined can refer to what is defined in the protocol. It should also be understood that in the embodiments of the present application, the “protocol” may refer to a standard protocol in the field of communications, for example, it may include LTE protocols, NR protocols, and related protocols used in future communication systems, and this application does not limit this.

[0058] Satellites can be categorized as either transparent payload or regenerative payload based on their functionality. Transparent payload satellites only provide radio frequency filtering, frequency conversion, and amplification, transparently forwarding signals without altering the waveform of the signal being forwarded. Regenerative payload satellites, in addition to providing radio frequency filtering, frequency conversion, and amplification, can also offer demodulation / decoding, routing / conversion, and encoding / modulation, embodying some or all of the functions of a base station.

[0059] In the NTN, one or more gateways may be included for communication between satellites and terminal devices.

[0060] FIG4 is a schematic diagram of an NTN scenario based on a transparent forwarding satellite according to an embodiment of the present application, and FIG5 is a schematic diagram of an NTN scenario based on a regenerative forwarding satellite according to an embodiment of the present application.

[0061] As shown in Figure 4, for an NTN scenario based on a transparent forwarding satellite (also known as a network device), where transparent forwarding can also be called transparent payload forwarding, the NTN gateway and satellite communicate via a feeder link, and the satellite and terminal device can communicate via a service link. Terminal devices and satellites, satellites and NTN gateways, and NTN gateways and gNBs can communicate via the NR Uu interface. The gNB and 5G Core Network (5G CN) can communicate via the NG interface. The 5G Core Network and the data network can communicate via the N6 interface. In the embodiment shown in Figure 4, the satellite and NTN gateway can be remote wireless units.

[0062] As shown in Figure 5, for an NTN scenario based on regenerative payload satellites (also known as network devices), communication between the NTN gateway and the satellite occurs via a feeder link, and between the satellite and the terminal device can occur via a service link. The terminal device and the satellite can communicate via the NR Uu interface. Communication between the satellite and the NTN gateway, and between the NTN gateway and the 5G CN, can occur via the NG interface. Communication between the 5G core network and the data network can occur via the N6 interface. In Figure 5, the NG interface can be implemented over the Satellite Radio Interface (SRI).

[0063] In Figures 4 and 5, NG-RAN stands for Next Generation Radio Access Network. In these figures, the gateway connects the satellite to the terrestrial public network (e.g., data network). The feeder link is used for communication between the gateway and the satellite. The service link is used for communication between the terminal device and the satellite. Intersatellite links exist within the regenerative forwarding network architecture.

[0064] To facilitate understanding of the technical solutions of the embodiments of the present application, the relevant technologies of the embodiments of the present application are described below. The following relevant technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all fall within the protection scope of the embodiments of the present application.

[0065] The random access procedure may be triggered by at least one of the following events:

[0066] A wireless connection is established when a terminal device initially accesses the network: the terminal device changes from the radio resource control idle (RRC_IDLE) state to the radio resource control connected (RRC_CONNECTED) state;

[0067] Radio Resource Control (RRC) connection reestablishment process: This allows the terminal device to reestablish the wireless connection after a radio link failure.

[0068] Handover: The terminal device needs to establish uplink synchronization with the new cell;

[0069] In the RRC_CONNECTED state, downlink (DL) data arrives, and the uplink (UL) is in an out-of-sync state.

[0070] In the RRC_CONNECTED state, UL data arrives, and the UL is out of synchronization or there are no Physical Uplink Control Channel (PUCCH) resources for sending a Scheduling Request (SR);

[0071] SR failed;

[0072] Synchronous reconfiguration request from RRC;

[0073] The terminal device transitions from the radio resource control inactive (RRC_INACTIVE) state to the RRC_CONNECTED state;

[0074] Establishing time alignment during the Secondary Cell (SCell) addition process;

[0075] Request additional system information (SI);

[0076] Beam failure recovery.

[0077] In NR, the following two random access methods are mainly supported: contention-based random access method and non-contention-based random access method.

[0078] FIG6 is a flow chart of a contention-based random access process provided in an embodiment of the present application. As shown in FIG6 , the contention-based random access process is divided into four steps. The contention-based random access process may also be referred to as a four-step random access process.

[0079] S601. The terminal device sends Msg1 to the network device.

[0080] Msg1 includes a random access preamble. The terminal selects a physical random access channel (PRACH) resource and sends the preamble on the selected PRACH. If non-contention-based random access is used, the PRACH resource and preamble can be specified by the base station. Based on the preamble, the base station can estimate the uplink timing and the grant size required for the terminal to transmit Msg3.

[0081] S602: The network device sends Msg2 to the terminal device.

[0082] Msg2 includes a Random Access Response (RAR). After the terminal device sends Msg1, it can open a random access response time window (RA-ResponseWindow) to monitor the Physical Downlink Control Channel (PDCCH) scrambled by the Random Access-Radio Network Temporary Identity (RA-RNTI). The RA-RNTI may be related to the PRACH time-frequency resources used by the terminal device to send Msg1.

[0083] Optionally, the RA-RNTI is calculated as follows: RA-RNTI = 1 + s_id + 14 × t_id + 14 × 80 × f_id + 14 × 80 × 8 × ul_carrier_id. That is, the RA-RNTI is related to the PRACH time-frequency resources used by the UE to send Msg1. Here, s_id is the index of the first OFDM symbol of the PRACH opportunity (PRACH occasion) (0 ≤ s_id < 14), t_id is the index of the first timeslot of the PRACH occasion in the system frame (0 ≤ t_id < 80), f_id is the index of the PRACH occasion in the frequency domain (0 ≤ f_id < 8), and ul_carrier_id is the UL carrier used for preamble transmission (0 indicates a normal uplink carrier, 1 indicates a supplementary uplink (SUL) carrier).

[0084] After the terminal device successfully receives the RA-RNTI-scrambled PDCCH, it can obtain the Physical Downlink Shared Channel (PDSCH) scheduled by the PDCCH, which includes the Random Access Response (RAR). The RAR specifically contains the following information:

[0085] The RAR subheader contains a back-off indicator (BI), which is used to indicate the back-off time for retransmitting Msg1.

[0086] Random Access Preamble IDentifier (RAPID) in RAR: preamble index received in the network response;

[0087] The RAR payload contains a Timing Advance Group (TAG), which is used to adjust the uplink timing.

[0088] Uplink grant (UL grant): used to schedule uplink resource indication of Msg3;

[0089] Temporary Cell-Radio Network Temporary Identifier (TC-RNTI): used to scramble the PDCCH of Msg4 (initial access).

[0090] If the terminal device receives a PDCCH scrambled with a random access response radio network temporary identifier (Random Access Response-Radio Network Temporary Identifier, RAR-RNTI), and the RAR contains the preamble index sent by itself, the terminal device considers that the random access response has been successfully received.

[0091] For non-contention-based random access, the random access process ends after the terminal device successfully receives Msg2. For contention-based random access, after the terminal device successfully receives Msg2, it needs to continue to transmit Msg3 and receive Msg4.

[0092] S603: The terminal device transmits Msg3 on the network scheduling resources.

[0093] Msg3 includes a Scheduled Transmission. Msg3 is primarily used to inform the network of the event that triggered the Random Access Channel (RACH) process. For example, if it's an initial random access process, Msg3 will carry the UE ID and establishment cause; if it's an RRC reestablishment, it will carry the connected UE ID and establishment cause.

[0094] Msg3 supports Hybrid Automatic Repeat reQuest (HARQ) retransmission.

[0095] S604. The network sends Msg4 to the terminal device.

[0096] Msg4 includes contention resolution. After each Msg3 transmission, the terminal device will start or restart the random access contention resolution start timer (ra-ContentionResolutionTimer) and monitor the PDCCH scrambled by C-RNTI or TC-RNTI during the timer.

[0097] Msg4 has two functions: one is for contention conflict resolution, and the second is for the network to transmit RRC configuration messages to the terminal device. There are two ways to resolve contention conflicts: one is that if the terminal device carries C-RNTI in Msg3, Msg4 is scheduled with PDCCH scrambled by C-RNTI. The other is that if the terminal device does not carry C-RNTI in Msg3, such as initial access, Msg4 is scheduled with PDCCH scrambled by TC-RNTI. The conflict is resolved by the terminal device receiving the PDSCH of Msg4 and matching the Common Control Channel Serving Data Unit (CCCH SDU) in the PDSCH.

[0098] Figure 7 is a schematic diagram of a non-contention-based random access process according to an embodiment of the present application. As shown in Figure 7, the non-contention-based random access process is divided into two steps, which can also be called a two-step random access process. The introduction of the two-step random access process can reduce latency and signaling overhead.

[0099] S701. The terminal device sends MsgA to the network device.

[0100] MsgA includes a random access preamble (Random Access Preamble).

[0101] In some embodiments, before S701 , the network device may assign a random access preamble (RA Preamble assignment) to the terminal device.

[0102] MsgA includes a random access preamble. For example, MsgA in a two-step random access includes a preamble transmitted on the PRACH and load information (eg, PUSCH payload) transmitted on the physical uplink shared channel (PUSCH).

[0103] S702: The network device sends MsgB to the terminal device.

[0104] MsgB includes a random access response (Random Access Response).

[0105] After MsgA is transmitted, the terminal device listens for the response (MsgB) from the network side within the configured window. If an indication of successful contention conflict resolution is received from the network, the terminal device ends the random access process.

[0106] The random access process described above demonstrates that its primary purpose is to achieve uplink synchronization between the terminal and the cell. During random access, the network device determines the time the terminal transmits the preamble based on the RACH time-frequency resources used by the preamble received from the terminal. This information then determines the terminal's initial TA based on the preamble's transmission and reception times, and notifies the terminal via the RAR.

[0107] Coverage has always been one of the main network performance factors that operators pay attention to. Compared with LTE, 5G operates in a higher frequency band. For example: for FR1, the operating frequency band is 3.5GHz; for FR2 band, the operating frequency band may be as high as 28GHz or 39GHz. The higher the operating frequency band, the greater the path loss experienced by the signal, resulting in a smaller coverage range. Usually, the network's transmission power is much greater than the terminal's transmission power, so the uplink coverage faces a more serious coverage limitation problem. To solve the above problems, R17 introduced the coverage enhancement project, the main goal of which is to study uplink coverage enhancement technologies applicable to FR1 and FR2 under TDD / FDD, including coverage enhancement for PUSCH and coverage enhancement for PUCCH.

[0108] For PUSCH, uplink coverage can be improved by using a repeated transmission mechanism. In the R15 / R16 standards, Msg3 PUSCH transmission during random access does not support repeated transmission. Based on the initial evaluation of R17, most companies believe that Msg3 PUSCH transmission is a major bottleneck affecting uplink coverage. To this end, R17 introduced the Msg3 PUSCH repeated transmission mechanism, which works as follows:

[0109] The network configures an RSRP threshold for the UE to request repeated transmission of Msg3. The UE determines whether to request repeated transmission of the PUSCH of Msg3 based on the RSRP measurement result. When the RSRP measurement value is less than the RSRP threshold, the UE can request repeated transmission of the PUSCH of Msg3; otherwise, the UE does not request repeated transmission of Msg3.

[0110] Regarding the method in which the UE requests repeated transmission of the PUSCH of Msg3, the main method is that the base station configures different PRACH resources / preambles for the UE requesting repeated transmission of the PUSCH of Msg3 and the UE not requesting repeated transmission of the PUSCH of Msg3. In this way, the base station can know whether the UE requests repeated transmission of the PUSCH of Msg3 based on the PRACH resources / preamble used by the UE to transmit Msg1.

[0111] The base station determines whether the UE requests repeated PUSCH transmission of Msg3 based on the PRACH resources / preamble used by the UE to transmit Msg1. For UEs requesting repeated PUSCH transmission of Msg3, the base station indicates the number of repeated Msg3 PUSCH transmissions via the PDCCH scrambled by the RAR or TC-RNTI.

[0112] The R17 NTN simulation evaluation and solution design are based on the basic assumption that the mobile terminal antenna gain is 0dBi. However, the actual antenna gain of a mobile terminal may be much lower than 0dBi (for example, -5dBi). In addition, considering that mobile terminals support linear polarization, there will be a certain polarization loss in the actual link (for example, 3dBi). Therefore, one of the research goals of the R18 NTN work phase (WI) is to introduce coverage enhancement technology for mobile terminals.

[0113] The Msg3 repetition mechanism introduced in R17 can be used in NTN systems. Since Msg3 repetition is an optional capability of the UE, not all UEs have the Msg3 repetition capability. Therefore, another way to improve Msg3 coverage performance is to use the Msg3 blind scheduling retransmission mechanism. In the TN system, the UE immediately starts the ra-ContentionResolutionTimer after each Msg3 transmission (including initial transmission and HARQ retransmission) is completed. The UE monitors the PDCCH during the ra-ContentionResolutionTimer. The UE needs to wait for at least one round-trip time (RTT) from sending Msg3 to receiving Msg4. Since the RTT of signal transmission between the base station and the UE in the NTN is much longer than that in the TN, for example, in the GEO scenario, the RTT can be as long as 541.46ms. To prevent invalid PDCCH monitoring caused by prematurely starting the ra-ContentionResolutionTimer, Release 17 added a delay offset equal to the UE-gNB RTT to the ra-ContentionResolutionTimer start time in the NTN. However, this introduced a problem: the UE could not receive the blind scheduling retransmission grant for the initial Msg3 transmission.

[0114] If the terminal device can support the reception of a blind scheduling retransmission grant for an initial Msg3 transmission, in order for the terminal device to support this function, the UE needs to be able to receive the blind scheduling retransmission grant for the initial Msg3 transmission. For example, the UE needs to be in a state of monitoring the PDCCH. On the one hand, not all UEs in the NTN have the ability to receive the blind scheduling retransmission grant for the initial Msg3 transmission (for example, R17 UE does not have this capability). On the other hand, the UE's monitoring of the blind scheduling retransmission grant for the initial Msg3 transmission will increase the terminal's power consumption. Therefore, it is necessary to design a corresponding mechanism to enable the network to know whether the UE has this capability or whether there is such a need, so as to assist the base station in making scheduling decisions (such as whether to blindly schedule the retransmission of the Msg3 for the initial Msg3 transmission of the UE).

[0115] To facilitate understanding of the technical solutions of the embodiments of this application, the technical solutions of this application are described in detail below through specific embodiments. The above-mentioned related technologies, as optional solutions, can be combined with the technical solutions of the embodiments of this application in any manner, and all of them fall within the scope of protection of the embodiments of this application. The embodiments of this application include at least some of the following. It should be noted that the communication method in this application can be applied to an NTN network or a TN network.

[0116] In an embodiment of the present application, the terminal device may determine the resources and / or preamble for sending the second information based on whether the terminal device supports blind scheduled retransmission of the first information or whether the terminal device supports blind scheduled retransmission grant monitoring of the first information. Optionally, the second information may be sent before the first information.

[0117] Optionally, the embodiment of the present application uses the first information as Msg3 and the second information as Msg1 as an example to illustrate the technical solution of the present application. It should be noted that in other embodiments, the first information and the second information can be other information, and the embodiment of the present application does not limit this.

[0118] FIG8 is a flow chart of a communication method provided in an embodiment of the present application. As shown in FIG8 , the method is applied to a terminal device, and the method includes:

[0119] S801. The terminal device determines resources and / or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of grant for blind scheduling retransmission of Msg3.

[0120] Optionally, in any embodiment of the present application, the blind scheduled retransmission of Msg3 can be replaced by at least one of the following: blind scheduled retransmission of Msg3 initial transmission (initial blind Msg3 retransmission), blind scheduled retransmission after Msg3 initial transmission, blind retransmission scheduling of Msg3, blind retransmission scheduling of Msg3 initial transmission, and blind retransmission scheduling after Msg3 initial transmission.

[0121] Optionally, the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, which can also be referred to in other embodiments as: the terminal device has the blind scheduling retransmission capability of Msg3, or has the blind scheduling retransmission grant monitoring capability of Msg3.

[0122] Optionally, the terminal device may have been configured before leaving the factory to determine whether it supports blind scheduling retransmission of Msg3 or whether it supports monitoring of the grant for blind scheduling retransmission of Msg3. Optionally, the terminal device may receive a target configuration sent by another device or network device, and determine whether it supports blind scheduling retransmission of Msg3 or whether it supports monitoring of the grant for blind scheduling retransmission of Msg3 based on the target configuration.

[0123] Optionally, the resources used to send Msg1 may include RO.

[0124] Optionally, the resource used to send Msg1 may include one of the following: a resource set, a single resource, an RO set, a single RO, a RACH resource set, or a single RACH resource. Optionally, the resource set may include one or more resources. Optionally, the RO set may include one or more ROs. Optionally, the RACH resource set may include one or more RACH resources.

[0125] Optionally, the preamble used to send Msg1 may include at least one of the following: a preamble set, a preamble. Optionally, the preamble may include one or more preambles.

[0126] Optionally, the resources and / or preamble used to send Msg1 may be determined by the terminal device according to pre-configuration, or may be configured by the network device to the terminal device, or may be agreed upon by a protocol.

[0127] Optionally, when the terminal device determines the resources and / or preamble for sending Msg1, the terminal device may send Msg1 based on the determined resources and / or preamble. Optionally, when the terminal device determines that the resources for sending Msg1 include one RO and / or one preamble, the terminal device may use the one RO and / or one preamble to send Msg1. Optionally, when the terminal device determines that the resources for sending Msg1 include multiple ROs and / or multiple preambles, the terminal device may select one RO from multiple ROs and / or one preamble from multiple preambles, and use the one RO and / or one preamble to send Msg1.

[0128] Optionally, the terminal device selecting an RO from multiple ROs may include: the terminal device randomly selecting an RO from the multiple ROs, or the terminal device selecting an RO from the multiple ROs based on one or more characteristics applicable to random access. Optionally, the terminal device selecting a preamble from multiple preambles may include: the terminal device randomly selecting a preamble from the multiple preambles, or the terminal device selecting a preamble from the multiple preambles based on one or more characteristics applicable to random access. Optionally, the selected RO and / or the selected preamble may correspond to all or some characteristics, where all characteristics include one or more characteristics applicable to random access.

[0129] Optionally, in some other embodiments, S101 may be replaced by: the terminal device sends Msg1 using target resources and / or target preamble according to whether the terminal device supports blind scheduled retransmission of Msg3 or whether it supports blind scheduled retransmission authorization grant monitoring of Msg3. Optionally, the target resource may include a first RO and the target preamble includes the first preamble, or the target resource may include a second RO and the target preamble includes a second preamble.

[0130] Optionally, if the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of blind scheduling retransmission grant of Msg3, the terminal device may monitor the blind scheduling retransmission grant of Msg3. Optionally, if the terminal device does not support blind scheduling retransmission of Msg3 or does not support monitoring of blind scheduling retransmission grant of Msg3, the terminal device will not monitor the blind scheduling retransmission grant of Msg3.

[0131] Optionally, the blind scheduling retransmission grant of Msg3 may include at least one of the following: indication information of blind scheduling retransmission of Msg3, time domain location information of the retransmitted Msg3, frequency domain location information of the retransmitted Msg3, and transmit power information of the retransmitted Msg3. Optionally, the time domain location information may include at least one of the following: frame, subframe, time slot, symbol, etc.

[0132] In an embodiment of the present application, a terminal device determines the resources and / or preamble for sending Msg1 based on whether the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of grant for blind scheduling retransmission of Msg3. In this way, the terminal device can indicate to the network device whether it supports blind scheduling retransmission of Msg3 or monitoring of grant for blind scheduling retransmission of Msg3 through the set resources and / or preamble, thereby facilitating the network device to make scheduling decisions based on the terminal device's support for blind scheduling retransmission of Msg3 or monitoring of grant for blind scheduling retransmission of Msg3, thereby facilitating improving the efficiency of resource scheduling by the network device.

[0133] FIG9 is a flow chart of another communication method provided in an embodiment of the present application. As shown in FIG9 , the method is applied to a network device, and the method includes:

[0134] S901. The network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of the blind scheduling retransmission grant of Msg3 based on the resources and / or preamble corresponding to the received Msg1.

[0135] Optionally, the network device may determine whether the terminal device supports blind scheduled retransmission of Msg3 or supports grant monitoring of blind scheduled retransmission of Msg3 based on whether the resources and / or preamble corresponding to the received Msg1 are included in the first RACH resources and / or the first preamble set. Exemplarily, if the answer is yes, it is determined that the terminal device supports it, and / or, if the answer is no, it is determined that the terminal device does not support it.

[0136] Optionally, the network device may determine whether the terminal device supports blind scheduled retransmission of Msg3 or supports grant monitoring of blind scheduled retransmission of Msg3 based on whether the resources and / or preamble corresponding to the received Msg1 are included in the second RACH resources and / or the second preamble set. Exemplarily, if the answer is yes, it is determined that the terminal device does not support it, and / or, if the answer is no, it is determined that the terminal device supports it.

[0137] Optionally, the network device may determine whether the terminal device supports blind scheduling retransmission of Msg3 or supports grant monitoring of blind scheduling retransmission of Msg3 based on the resources and / or preamble corresponding to the received Msg1, which are included in the first RACH resource or the second RACH resource, and / or, are included in the first preamble set or the second preamble set. Exemplarily, when included in the first RACH resource and / or the first preamble set, it is determined that the terminal device supports it, and / or, when included in the second RACH resource and / or the second preamble set, it is determined that the terminal device does not support it.

[0138] In other embodiments, the network device may determine whether to send a blind scheduling retransmission grant of Msg3 to the terminal device based on the resources and / or preamble corresponding to the received Msg1.

[0139] In some embodiments, the method further includes: when the terminal device supports blind scheduled retransmission of Msg3 or supports blind scheduled retransmission grant monitoring of Msg3, the terminal device uses the first random access channel opportunity RO and / or the first preamble to send the Msg1.

[0140] In some embodiments, the method further includes: when the terminal device does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, the terminal device uses a second RO and / or a second preamble to send the Msg1.

[0141] In some embodiments, the method further includes: when the terminal device supports blind scheduled retransmission of Msg3 or supports blind scheduled retransmission grant monitoring of Msg3, the terminal device sends the Msg1 based on the first RACH resource and / or the first preamble set. Optionally, the terminal device sends the Msg1 based on the first RACH resource and / or the first preamble set, which may include: the terminal device selects a first RO and / or a first preamble from the first RACH resource and / or the first preamble set, and uses the first RO and / or the first preamble to send the Msg1.

[0142] In some embodiments, the method further includes: when the terminal device does not support blind scheduled retransmission of Msg3 or does not support blind scheduled retransmission grant monitoring of Msg3, the terminal device sends the Msg1 based on the second RACH resource and / or the second preamble set. Optionally, the terminal device sends the Msg1 based on the second RACH resource and / or the second preamble set, which may include: the terminal device selects a second RO and / or a second preamble from the second RACH resource and / or the second preamble set, and uses the second RO and / or the second preamble to send the Msg1.

[0143] Optionally, the first RO may be included in a first RACH resource. Optionally, the first preamble may be included in a first preamble set. Optionally, the second RO may be included in a second RACH resource. Optionally, the second preamble may be included in a second preamble set.

[0144] Optionally, in any embodiment of the present application, the first RACH resource may include one or more ROs. Optionally, in any embodiment of the present application, the first preamble set may include one or more preambles. Optionally, in any embodiment of the present application, the second RACH resource may include one or more ROs. Optionally, in any embodiment of the present application, the second preamble set may include one or more preambles.

[0145] Corresponding to the network device side:

[0146] In some embodiments, the network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 based on the resources and / or preamble corresponding to the received Msg1, including: when the Msg1 corresponds to the first random access channel opportunity RO and / or the first preamble, the network device determines that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3.

[0147] In some embodiments, the network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or whether it supports blind scheduling retransmission grant monitoring of Msg3 based on the resources and / or preamble corresponding to the received Msg1, including: when the Msg1 corresponds to the second RO and / or second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3.

[0148] In other embodiments, when the Msg1 corresponds to the first random access channel opportunity RO and / or the first preamble, the network device sends a blind scheduling retransmission grant of Msg3 to the terminal device, and / or, when the Msg1 corresponds to the second RO and / or the second preamble, the network device does not send a blind scheduling retransmission grant of Msg3 to the terminal device.

[0149] In some embodiments, the method further includes: the terminal device receiving configuration information of the first RO and / or the first preamble. Optionally, the terminal device receives the configuration information of the first RO and / or the first preamble sent by a network device. In this way, the first RO and / or the first preamble, or the configuration information of the first RO and / or the first preamble, is received by the terminal device.

[0150] In some embodiments, the method further includes: the terminal device receiving configuration information of the second RO and / or the second preamble. Optionally, the terminal device receives the configuration information of the second RO and / or the second preamble sent by a network device. In this way, the second RO and / or the second preamble, or the configuration information of the second RO and / or the second preamble, is received by the terminal device.

[0151] In some embodiments, the method further includes: the terminal device determining the second RO based on the first RO. Optionally, the second RO may not overlap with or be the same as the first RO. Optionally, the terminal device may determine the second RO based on the first RO and resources available for sending Msg1. For example, the second RO may be an RO other than the first RO in the resources available for sending Msg1.

[0152] In some embodiments, the method further includes: the terminal device determining the first RO based on the second RO. Alternatively, the terminal device may determine the first RO based on the second RO and resources available for sending Msg1. For example, the first RO may be an RO other than the second RO in the resources available for sending Msg1.

[0153] In some embodiments, the method further includes: the terminal device determining the second preamble based on the first preamble. Optionally, the first preamble may be different from the second preamble. Optionally, the terminal device may determine the second preamble based on the first preamble and a preamble set that can be used to send Msg1. For example, the second preamble may be a preamble in the preamble set that can be used to send Msg1, other than the first preamble.

[0154] In some embodiments, the method further includes: the terminal device determining the first preamble based on the second preamble. Optionally, the terminal device may determine the first preamble based on the second preamble and a preamble set that can be used to send Msg1. For example, the first preamble may be a preamble in the preamble set that can be used to send Msg1, other than the second preamble.

[0155] In some embodiments, the method further includes: the terminal device receiving configuration information of a first random access channel (RACH) resource and / or a first preamble set; the first RACH resource includes the first RO, and the first preamble set includes the first preamble. Optionally, the terminal device receives configuration information of the first RACH resource and / or the first preamble set sent by a network device. In this way, the first RACH resource and / or the first preamble set, or the first RACH resource and / or the first preamble set, is received by the terminal device.

[0156] In some embodiments, the method further includes: the terminal device receiving configuration information of a second RACH resource and / or a second preamble set; the second RACH resource includes the second RO, and the second preamble set includes the second preamble. Optionally, the terminal device receives configuration information of the second RACH resource and / or the second preamble set sent by the network device. In this way, the second RACH resource and / or the second preamble set, or the configuration information of the second RACH resource and / or the second preamble set, is received by the terminal device.

[0157] In some embodiments, the method further includes: the terminal device determining the second RACH resource based on the first RACH resource. Optionally, the first RACH resource may not overlap with or be different from the second RACH resource. Optionally, the terminal device may determine the second RACH resource based on the first RACH resource and resources available for sending Msg1. For example, the second RACH resource may be all or part of the resources available for sending Msg1, excluding the first RACH resource.

[0158] In some embodiments, the method further includes: the terminal device determining the first RACH resource based on the second RACH resource. Optionally, the terminal device may determine the first RACH resource based on the second RACH resource and resources available for sending Msg1. For example, the first RACH resource may be all or part of the resources available for sending Msg1, excluding the second RACH resource.

[0159] In some embodiments, the method further includes: the terminal device determining the second preamble set based on the first preamble set. Optionally, the terminal device may determine the second preamble set based on the first preamble set and a preamble set that can be used to send Msg1. For example, the second preamble set may be all or part of the preambles in the preamble set that can be used to send Msg1, except for the first preamble set.

[0160] In some embodiments, the method further includes: the terminal device determining the first preamble set based on the second preamble set. Optionally, the terminal device may determine the first preamble set based on the second preamble set and a preamble set that can be used to send Msg1. For example, the first preamble set may be all or part of the preambles in the preamble set that can be used to send Msg1, excluding the second preamble set.

[0161] Optionally, at least one of the first RO, the second RO, the first preamble, the second preamble, the first RACH resource, the second RACH resource, the first preamble set, and the second preamble set can be configured to the terminal device via a broadcast message (e.g., a SIBx message or a MIB message) or terminal device-specific signaling (e.g., RRC signaling or other signaling). Optionally, x in SIBx can be any integer greater than or equal to 1. For example, the terminal device receives a SIBx message or MIB message broadcast by a network device, and the SIBx message or MIB message includes: at least one of the first RO, the second RO, the first preamble, the second preamble, the first RACH resource, the second RACH resource, the first preamble set, and the second preamble set. For another example, the terminal device receives RRC signaling or other signaling sent by the network device, and the RRC signaling or other signaling includes: at least one of the first RO, the second RO, the first preamble, the second preamble, the first RACH resource, the second RACH resource, the first preamble set, and the second preamble set.

[0162] Optionally, terminal device dedicated signaling can be called UE dedicated signaling.

[0163] Optionally, the first RO may be one RO, or the first RO may be multiple ROs. Optionally, the second RO may be one RO, or the second RO may be multiple ROs. Optionally, the first preamble may be one preamble, or the first preamble may be multiple preambles. Optionally, the second preamble may be one preamble, or the second preamble may be multiple preambles.

[0164] Corresponding to the network device side:

[0165] In some embodiments, the method further includes: the network device sending configuration information of the first RO and / or the first preamble. Optionally, the network device may broadcast or multicast the configuration information of the first RO and / or the first preamble. Optionally, the network device may unicast the configuration information of the first RO and / or the first preamble to the terminal device.

[0166] In some embodiments, the method further includes: the network device sending configuration information of the second RO and / or the second preamble. Optionally, the network device may broadcast or multicast the configuration information of the second RO and / or the second preamble. Optionally, the network device may unicast the configuration information of the second RO and / or the second preamble to the terminal device.

[0167] In some embodiments, the method further includes: the network device sending configuration information of a first random access channel (RACH) resource and / or a first preamble set; the first RACH resource includes the first RO, and the first preamble set includes the first preamble. Optionally, the network device may broadcast or multicast the configuration information of the first RACH resource and / or the first preamble set. Optionally, the network device may unicast the configuration information of the first RACH resource and / or the first preamble set to the terminal device.

[0168] In some embodiments, the method further includes: the network device sending configuration information for a second RACH resource and / or a second preamble set; the second RACH resource includes the second RO, and the second preamble set includes the second preamble. Optionally, the network device may broadcast or multicast the configuration information for the second RACH resource and / or the second preamble set. Optionally, the network device may unicast the configuration information for the second RACH resource and / or the second preamble set to the terminal device.

[0169] In some embodiments, the first RO and / or the first preamble corresponds to a non-terrestrial communication network NTN.

[0170] In some embodiments, the first RACH resource and / or the first preamble set corresponds to an NTN.

[0171] In some embodiments, the second RO and / or the second preamble corresponds to NTN.

[0172] In some embodiments, the second RACH resource and / or the second preamble set corresponds to an NTN.

[0173] Optionally, at least one of the first RO, the second RO, the first RACH resource, and the second RACH resource may be defined only in the NTN and not in the TN, or may be defined in both the NTN and the TN.

[0174] Optionally, at least one of the first preamble, the second preamble, the first preamble set, and the second preamble set may be defined only in the NTN and not in the TN, or may be defined in both the NTN and the TN.

[0175] In some embodiments, at least one of the first RO, the first preamble, the second RO, and the second preamble is configured to the terminal device via a broadcast message or a signaling dedicated to the terminal device.

[0176] In some embodiments, at least one of the first RACH resource, the first preamble set, the second RACH resource, and the second preamble set is configured to the terminal device via a broadcast message or signaling dedicated to the terminal device.

[0177] Optionally, the broadcast message in any embodiment of the present application may include one of the following: SIBx message, MIB message, system message, synchronization signal block (Synchronization Signal Block, SSB); x in SIBx can be any integer greater than or equal to 1.

[0178] Optionally, the terminal device-specific signaling in any embodiment of the present application may include RRC signaling or other signaling.

[0179] Corresponding to the network device side:

[0180] The method further includes: the network device sending a broadcast message or the terminal device dedicated signaling;

[0181] The broadcast message or the terminal device dedicated signaling includes or indicates at least one of the following: the first RO, the first preamble, the second RO, the second preamble, or,

[0182] The broadcast message or the terminal device dedicated signaling includes or indicates at least one of the following: a first RACH resource, a first preamble set, a second RACH resource, and a second preamble set.

[0183] Optionally, the network device may broadcast the broadcast message, or the network device may send the terminal device-specific signaling to the terminal device.

[0184] In some embodiments, the terminal device determines resources and / or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or whether it supports blind scheduling retransmission authorization grant monitoring of Msg3, including:

[0185] The terminal device determines the resources and / or preamble for sending the Msg1 based on whether the terminal device supports blind scheduled retransmission of Msg3 or whether it supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell.

[0186] Optionally, the terminal device may periodically or aperiodically measure the reference signal of the current serving cell to obtain a measurement result. Optionally, the terminal device may receive a measurement configuration sent by a network device and measure the reference signal of the current serving cell according to the measurement configuration. Optionally, the measurement configuration sent by the network device may include the measurement configuration of the current serving cell, but not the measurement configuration of cells other than the current serving cell, or may include the measurement configuration of the current serving cell and the measurement configuration of cells other than the current serving cell.

[0187] Optionally, the measurement result may include at least one of the following measurement parameter values: reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal to interference plus noise ratio (SINR), received signal code power (RSCP), and signal to noise ratio (SNR).

[0188] Optionally, the reference signal may include at least one of the following: an SSB and a Channel State Information-Reference Signal (CSI-RS). The SSB may also be referred to as a Synchronization Signal / Physical Broadcast Channel Block (SS / PBCH block). It should be noted that the reference signal may also be other signals, such as new reference signals defined in the NTN or other signals specified in the protocol, and this is not limited in the embodiments of the present application.

[0189] Optionally, the terminal device determines the resources and / or preamble for sending the Msg1 based on whether the terminal device supports blind scheduled retransmission of Msg3 or whether it supports grant monitoring of blind scheduled retransmission of Msg3, and the difference between the reference signal measurement result of the terminal device in the current serving cell and a certain threshold. Optionally, the certain threshold includes a first threshold, a second threshold, or a third threshold.

[0190] Optionally, in any embodiment of the present application, the reference signal measurement result being greater than or equal to a certain threshold (including a first threshold, a second threshold, or a third threshold, etc.) may include: at least one measurement value in the reference signal measurement result being greater than or equal to at least one sub-threshold, respectively, and the measurement value may correspond one-to-one with the sub-threshold. Exemplarily, the reference signal measurement result includes an RSRP value and an RSRQ value, and the reference signal measurement result being greater than or equal to a certain threshold may include: the RSRP value being greater than or equal to the first sub-threshold, and the RSRQ value being greater than or equal to the second sub-threshold.

[0191] Optionally, in any embodiment of the present application, the reference signal measurement result is less than or equal to a certain threshold (including a first threshold, a second threshold, or a third threshold, etc.), and may include: at least one measurement value in the reference signal measurement result is less than or equal to at least one sub-threshold, and the measurement value can correspond one-to-one to the sub-threshold.

[0192] In some embodiments, the method further includes: when the terminal device supports blind scheduled retransmission of Msg3 or supports blind scheduled retransmission grant monitoring of Msg3, and the reference signal measurement result is less than or equal to the first threshold, the terminal device uses the first RO and / or the first preamble to send the Msg1.

[0193] In some embodiments, the method further includes: when the terminal device does not support blind scheduled retransmission of Msg3 or does not support blind scheduled retransmission grant monitoring of Msg3, and / or when the reference signal measurement result is greater than or equal to the first threshold, the terminal device uses a second RO and / or a second preamble to send the Msg1.

[0194] Optionally, the terminal device may first determine whether blind scheduled retransmission of Msg3 is supported or whether grant monitoring of blind scheduled retransmission of Msg3 is supported. If the answer is yes, the terminal device determines whether the reference signal measurement result is less than or equal to a first threshold. If the answer is yes, the terminal device uses the first RO and / or the first preamble to send the Msg1. Optionally, if the terminal device determines that at least one of the two conditions is no, the terminal device uses the second RO and / or the second preamble to send the Msg1.

[0195] Optionally, the terminal device may first determine whether the reference signal measurement result is less than or equal to a first threshold. If so, the terminal device determines whether blind scheduled retransmission of Msg3 is supported or whether grant monitoring of blind scheduled retransmission of Msg3 is supported. If so, the terminal device uses the first RO and / or the first preamble to send the Msg1. Optionally, if the terminal device determines that at least one of the two conditions is no, the terminal device uses the second RO and / or the second preamble to send the Msg1.

[0196] Corresponding to the network device side:

[0197] In some embodiments, when the Msg1 corresponds to the first random access channel opportunity RO and / or the first preamble, the network device determines that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, including: when the Msg1 corresponds to the first RO and / or the first preamble, the network device determines that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, and determines that the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the first threshold.

[0198] In some embodiments, when the Msg1 corresponds to the second RO and / or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3, including: when the Msg1 corresponds to the second RO and / or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3, and / or determines that the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the first threshold.

[0199] In some embodiments, the method further includes: when the terminal device supports / requests Msg3 repetition (Mg3 repetition), supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result is less than or equal to a second threshold, the terminal device uses the first RO and / or the first preamble to send the Msg1.

[0200] Optionally, the terminal device may have been configured before leaving the factory to determine whether it supports repeated Msg3 transmission. Optionally, the terminal device may receive a target configuration sent by another device or network device and determine whether it supports repeated Msg3 transmission according to the target configuration.

[0201] Optionally, in any embodiment of the present application, repeated transmission of Msg3 may also be referred to as Msg3 repetition.

[0202] Optionally, the second threshold may be the same as or different from the first threshold. Optionally, the second threshold may be greater than, less than or equal to the first threshold.

[0203] In some embodiments, the method further includes: when the terminal device supports / requests repeated transmission of Msg3, and does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, and / or when the reference signal measurement result is greater than or equal to a second threshold, the terminal device uses a second RO and / or a second preamble to send the Msg1.

[0204] In some embodiments, the method further includes: when the terminal device does not support / request repeated transmission of Msg3, supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result is less than or equal to a third threshold, the terminal device uses the first RO and / or the first preamble to send the Msg1.

[0205] Optionally, the third threshold may be the same as or different from the first threshold. Optionally, the third threshold may be greater than, less than, or equal to the first threshold. Optionally, the third threshold may be the same as or different from the second threshold. Optionally, the third threshold may be greater than, less than, or equal to the second threshold.

[0206] In some embodiments, the method further includes: when the terminal device does not support / request repeated transmission of Msg3, and does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, and / or when the reference signal measurement result is greater than or equal to a third threshold, the terminal device uses a second RO and / or a second preamble to send the Msg1.

[0207] Optionally, the terminal device may first determine whether the terminal device supports repeated transmission of Msg3, and / or whether it supports blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, and then determine the difference between the reference signal measurement result and the second threshold or the third threshold. Optionally, the terminal device may first determine the difference between the reference signal measurement result and the second threshold or the third threshold, and then determine whether the terminal device supports repeated transmission of Msg3, and / or whether it supports blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3.

[0208] Corresponding to the network device side:

[0209] In some embodiments, when the Msg1 corresponds to the first random access channel opportunity RO and / or the first preamble, the network device determines that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, including:

[0210] In a case where the Msg1 corresponds to the first RO and / or the first preamble, the network device determines one of the following:

[0211] The terminal device supports / requests repeated transmission of Msg3, supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the second threshold;

[0212] The terminal device does not support / request repeated transmission of Msg3, supports blind scheduled retransmission of Msg3 or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the third threshold.

[0213] In some embodiments, when the Msg1 corresponds to the second RO and / or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3, including:

[0214] In a case where the Msg1 corresponds to the second RO and / or the second preamble, the network device determines one of the following:

[0215] The terminal device supports / requests repeated transmission of Msg3, and does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, and / or the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the second threshold;

[0216] The terminal device does not support / request repeated transmission of Msg3, and does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, and / or the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the third threshold.

[0217] In some embodiments, the method further includes: the terminal device receiving at least one of the following: a first threshold, a second threshold, and a third threshold.

[0218] Optionally, the terminal device may receive at least one of the following sent by the network device: a first threshold, a second threshold, and a third threshold.

[0219] Corresponding to the network device side:

[0220] In some embodiments, the method further includes: the network device sending at least one of the following: a first threshold, a second threshold, and a third threshold. Optionally, the network device may broadcast, multicast, or unicast at least one of the following: the first threshold, the second threshold, and the third threshold to the terminal device.

[0221] In some embodiments, at least one of the first threshold, the second threshold, and the third threshold is a predefined threshold. Optionally, the predefined threshold can be a threshold predefined by the terminal device or a threshold predefined by the network device.

[0222] In some embodiments, at least one of the first threshold, the second threshold, and the third threshold is a threshold specified by a protocol.

[0223] In some embodiments, at least one of the first threshold, the second threshold, and the third threshold is configured for the terminal device via a broadcast message (e.g., a SIBx message or a MIB message) or terminal device-specific signaling (e.g., RRC signaling or other signaling). For example, the terminal device receives a SIBx message or MIB message broadcast by a network device, where the SIBx message or MIB message includes at least one of the first threshold, the second threshold, and the third threshold. For another example, the terminal device receives RRC signaling or other signaling sent by a network device, where the RRC signaling or other signaling includes at least one of the first threshold, the second threshold, and the third threshold.

[0224] In some embodiments, the first threshold is a threshold used by the terminal device to determine whether to request repeated transmission of Msg3. In other embodiments, the first threshold can be determined based on the threshold used by the terminal device to determine whether to request repeated transmission of Msg3. Exemplarily, the first threshold can be determined based on the result of adding / subtracting a relative threshold from the threshold used by the terminal device to determine whether to request repeated transmission of Msg3. The value of the relative threshold can be a predefined value or a network configured value. In some embodiments, the second threshold and / or the third threshold can be a threshold used by the terminal device to determine whether to request repeated transmission of Msg3. In other embodiments, the second threshold and / or the third threshold can be determined based on the threshold used by the terminal device to determine whether to request repeated transmission of Msg3. Exemplarily, the second threshold and / or the third threshold can be determined based on the result of adding / subtracting a relative threshold from the threshold used by the terminal device to determine whether to request repeated transmission of Msg3. The value of the relative threshold can be a predefined value or a network configured value.

[0225] Optionally, the threshold used by the terminal device to determine whether to request repeated transmission of Msg3 may be rsrp-ThresholdMsg3.

[0226] In some embodiments, the characteristic priority of the first characteristic corresponding to the blind scheduled retransmission of the Msg3 or the blind scheduled retransmission grant monitoring of the Msg3 is the first priority; the first priority is used to determine the resources and / or preamble used to send the Msg1 in the case of random access to which multiple characteristics are applicable / triggered; the multiple characteristics include the first characteristic.

[0227] Optionally, the terminal device may determine a priority of each of the multiple characteristics, wherein the priority of each of the multiple characteristics is used to determine resources and / or preamble for sending the Msg1 in case of random access to which the multiple characteristics are applicable / triggered.

[0228] Optionally, the first priority, or the priority of each of the multiple characteristics, is used to determine the resources and / or preamble for sending the Msg1 when multiple characteristics are applicable / triggered for random access and there is no RO and / or preamble, or there are no resources and / or preamble, which can indicate all characteristics that trigger random access. Optionally, all characteristics can be multiple characteristics.

[0229] In some embodiments, in the case of random access to which multiple characteristics are applicable / triggered, the terminal device may send the Msg1 using a first RO and / or a first preamble corresponding to multiple characteristics, or resources and / or preamble corresponding to multiple characteristics.

[0230] In some embodiments, in the case of random access to which multiple characteristics are applicable / triggered, and there is no RO and / or preamble, or no resources and / or preamble, corresponding to all characteristics (i.e., multiple characteristics), some of the multiple characteristics can be determined according to the priorities corresponding to the multiple characteristics, and the Msg1 can be sent using the first RO and / or first preamble corresponding to the some characteristics, or the resources and / or preamble corresponding to the some characteristics.

[0231] In some embodiments, the method further includes: the terminal device receiving the first priority configuration. Optionally, the terminal device receives the first priority configuration sent by a network device.

[0232] In some embodiments, the method further comprises: the terminal device receiving a priority configuration of at least one characteristic other than the first characteristic. Optionally, the terminal device receives the priority configuration of at least one characteristic other than the first characteristic sent by a network device.

[0233] In other embodiments, the first priority, and / or the priority of at least one characteristic other than the first characteristic, may be determined by the terminal device according to pre-configuration, or may be agreed upon by a protocol.

[0234] Optionally, the first priority, and / or the priority of at least one characteristic other than the first characteristic, can be configured to the terminal device through a broadcast message (for example, a SIBx message or a MIB message) or terminal device-specific signaling (such as RRC signaling or other signaling). For example, the terminal device receives a SIBx message or a MIB message broadcast by a network device, and the SIBx message or the MIB message includes: the first priority, and / or the priority of at least one characteristic other than the first characteristic. For another example, the terminal device receives RRC signaling or other signaling sent by a network device, and the RRC signaling or other signaling includes: the first priority, and / or the priority of at least one characteristic other than the first characteristic.

[0235] Optionally, the at least one characteristic other than the first characteristic may include at least one of a second characteristic, a third characteristic, and a fourth characteristic. Optionally, the second characteristic corresponds to the terminal device supporting Msg3 repetition. Optionally, the third characteristic corresponds to the terminal device being a reduced capability (Redcap) terminal. Optionally, the fourth characteristic corresponds to the terminal device supporting small data transmission (SDT).

[0236] It should be noted that this application only exemplarily lists at least one characteristic other than the first characteristic. In other embodiments, the at least one characteristic other than the first characteristic may also include other characteristics, such as the fifth characteristic and / or the sixth characteristic, etc.

[0237] Corresponding to the network device side:

[0238] In some embodiments, the method further includes: the network device sending the first priority configuration. Optionally, the network device broadcasts, multicasts, or unicasts the first priority configuration to the terminal device.

[0239] In some embodiments, the method further comprises: the network device sending a priority configuration of at least one characteristic other than the first characteristic. Optionally, the network device broadcasts, multicasts, or unicasts the priority configuration of at least one characteristic other than the first characteristic to the terminal device.

[0240] In some embodiments, the second priority is higher than the first priority, or the second priority is lower than the first priority. The second priority is the priority of the second characteristic corresponding to the repeated transmission of Msg3. In other embodiments, the second priority is lower than or equal to the first priority.

[0241] Optionally, the feature priority of the third feature may be the third priority, and the feature priority of the fourth feature may be the fourth priority. Optionally, the third priority may be higher than, equal to, or lower than the first priority. Optionally, the fourth priority may be higher than, equal to, or lower than the first priority. Optionally, the third priority may be higher than, equal to, or lower than the second priority. Optionally, the fourth priority may be higher than, equal to, or lower than the second priority. Optionally, the fourth priority may be higher than, equal to, or lower than the third priority.

[0242] It should be noted that if priority A is higher than priority B, the value of priority A is smaller than the value of priority B. Correspondingly, if priority A is lower than priority B, the value of priority A is larger than the value of priority B.

[0243] In some embodiments, the method further includes: when random access is applicable to both the first characteristic and at least one characteristic other than the first characteristic, or when random access is triggered by the first characteristic and at least one characteristic other than the first characteristic, the terminal device sends the Msg1 using a third RO and / or a third preamble.

[0244] Optionally, the third RACH resource includes the third RO, the third preamble set includes the third preamble, and the third RACH resource and / or the third preamble set are used to indicate all characteristics that trigger the random access. Optionally, all characteristics include the first characteristic and at least one characteristic other than the first characteristic.

[0245] Optionally, the third RO and / or the third preamble may correspond to all characteristics.

[0246] Exemplarily, when at least one characteristic other than the first characteristic is the second characteristic, the first characteristic corresponds to a first RACH resource and / or a first preamble set, the second characteristic corresponds to a fifth RACH resource and / or a fifth preamble set, the third RO may be included in the intersection of the first RACH resource and the fifth RACH resource, and the third preamble is included in the intersection of the first preamble set and the fifth preamble set.

[0247] Corresponding to the network device side:

[0248] In some embodiments, the network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 based on the resources and / or preamble corresponding to the received Msg1, including:

[0249] The network device determines, according to the third RO and / or the third preamble corresponding to the received Msg1, that random access is applicable to both the first feature and at least one feature other than the first feature, or determines that random access is triggered by the first feature and at least one feature other than the first feature;

[0250] The third RACH resource includes the third RO, the third preamble set includes the third preamble, and the third RACH resource and / or the third preamble set are used to indicate all characteristics of triggering the random access.

[0251] In some embodiments, the method further includes: when random access is applicable to the first characteristic and at least one characteristic other than the first characteristic, or when random access is triggered by the first characteristic and at least one characteristic other than the first characteristic, and there is no third RACH resource and / or third preamble set for indicating all characteristics that trigger the random access, and there is at least one fourth RACH resource and / or fourth preamble set for indicating some of the characteristics among all characteristics that trigger the random access, the terminal device uses a fourth RO and / or a fourth preamble to send the Msg1.

[0252] Optionally, the terminal device uses a fourth RO and / or a fourth preamble to send the Msg1, which may include: the terminal device selects a fourth RACH resource and / or a fourth preamble set from at least one fourth RACH resource and / or at least one fourth preamble set according to the first priority and the priority of each characteristic of the at least one characteristic, and uses the fourth RO and / or fourth preamble to send the Msg1.

[0253] Optionally, the fourth RO and / or fourth preamble is included in the selected fourth RACH resource and / or a fourth preamble set. Optionally, the fourth RO and / or fourth preamble can be used to indicate some of all characteristics triggering the random access.

[0254] Optionally, the third RACH resource and / or the third preamble set may include one or more ROs and / or one or more preambles. Optionally, the fourth RACH resource and / or the fourth preamble set may include one or more ROs and / or one or more preambles.

[0255] Exemplarily, when at least one characteristic other than the first characteristic is the second characteristic, the first characteristic corresponds to a first RACH resource and / or a first preamble set, and the second characteristic corresponds to a fifth RACH resource and / or a fifth preamble set. If the first RACH resource and the fifth RACH resource have no intersection, and / or if the first preamble set and the fifth preamble set have no intersection, then there is no third RACH resource and / or a third preamble set for indicating all characteristics (i.e., the first characteristic and the second characteristic) for triggering the random access. The terminal device can determine, based on the first priority and the second priority, the fifth RACH resource and / or the fifth preamble set as a selected fourth RACH resource and / or a fourth preamble set.

[0256] In this way, when random access is applicable to the first characteristic and at least one characteristic other than the first characteristic, or when random access is triggered by the first characteristic and at least one characteristic other than the first characteristic, and there is no RO and / or preamble that can correspond to all characteristics, and there is a fourth RO and / or fourth preamble corresponding to some characteristics, the Msg1 is sent using the fourth RO and / or fourth preamble.

[0257] Corresponding to the network device side:

[0258] In some embodiments, the network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 based on the resources and / or preamble corresponding to the received Msg1, including:

[0259] The network device determines, based on the received Msg1 corresponding to the fourth RO and / or the fourth preamble, that random access is applicable to some characteristics, or determines that random access is triggered by some characteristics; the some characteristics are a subset of all characteristics, and all characteristics include the first characteristic and at least one characteristic other than the first characteristic.

[0260] The fourth RO and / or fourth preamble are included in a fourth RACH resource and / or a fourth preamble set;

[0261] The fourth RACH resource and / or the fourth preamble set are selected from at least one fourth RACH resource and / or at least one fourth preamble set;

[0262] The at least one fourth RACH resource and / or the at least one fourth preamble set are used to indicate some of all characteristics that trigger the random access.

[0263] In some embodiments, the method further includes: when the terminal device uses the first RO and / or the first preamble to send the Msg1, the terminal device monitors the blind scheduling retransmission grant of Msg3.

[0264] Optionally, the terminal device may monitor the blind scheduling retransmission grant of Msg3 after sending Msg1. Exemplarily, the terminal device may start monitoring the blind scheduling retransmission grant of Msg3 from the time of sending Msg1 as the starting point and at least at a first time interval equal to the round-trip delay between the terminal device and the network device. As another example, the terminal device may start monitoring the blind scheduling retransmission grant of Msg3 from the time of initial transmission of Msg3 as the starting point and at least at a second time interval equal to the round-trip delay between the terminal device and the network device. As another example, the terminal device may start monitoring the blind scheduling retransmission grant of Msg3 at any time between the first time and the second time.

[0265] Optionally, the duration for which the terminal device monitors the blind scheduling retransmission grant of Msg3 can be a preset duration. Optionally, the terminal device can periodically or non-periodically monitor the blind scheduling retransmission grant of Msg3. Optionally, the terminal device can receive the scheduling number sent by the network device, and according to the scheduling number, start a monitoring timer for the scheduling number of times, and monitor the blind scheduling retransmission grant of Msg3 during the operation of the monitoring timer. Optionally, each time the terminal device receives the blind scheduling retransmission grant of Msg3, it may include indication information for indicating whether there is the next blind scheduling retransmission grant of Msg3.

[0266] In some embodiments, the method further includes: when the terminal device uses a second RO and / or a second preamble to send the Msg1, the terminal device does not monitor the blind scheduling retransmission grant of Msg3.

[0267] Optionally, the terminal device monitors Msg4 during the start time of the ra-ContentionResolutionTimer timer, and does not need to monitor Msg4 outside the start time of the ra-ContentionResolutionTimer timer.

[0268] Corresponding to the network device side:

[0269] In some embodiments, the method further includes: when the Msg1 corresponds to the first RO and / or the first preamble, the network device sends a blind scheduling retransmission grant of Msg3.

[0270] In some embodiments, the method further includes: when the Msg1 corresponds to the second RO and / or the second preamble, the network device does not send a blind scheduling retransmission grant of the Msg3.

[0271] In an embodiment of the present application, the terminal device determines the resources and / or preamble for sending Msg1 based on whether the terminal device supports blind scheduling retransmission of Msg3 or whether it supports blind scheduling retransmission authorization grant monitoring of Msg3. The network device sends or does not send the blind scheduling retransmission grant of Msg3 based on the resources and / or preamble corresponding to the received Msg1. Optionally, in a case where the Msg1 corresponds to the first random access channel opportunity RO and / or the first preamble, the network device sends the blind scheduling retransmission grant of Msg3, and / or, in a case where the Msg1 corresponds to the second RO and / or the second preamble, the network device does not send the blind scheduling retransmission grant of Msg3.

[0272] The communication method of the embodiment of the present application is further described below:

[0273] Example 1:

[0274] In the NTN cell, the network device configures a separate first RACH resource and / or a first preamble set for the UE that supports blind scheduling retransmission (grant monitoring) of the initial transmission of Msg3, and the UE that supports blind scheduling retransmission monitoring of the initial transmission of Msg3 uses the first RACH resource and / or the first preamble set to send Msg1, thereby informing the network device that the UE can receive the blind scheduling retransmission grant for the initial transmission of Msg3.

[0275] The specific implementation process is as follows:

[0276] 1. The UE receives RACH configuration information from the network device, including:

[0277] a) For UEs supporting blind scheduling of retransmissions (grant monitoring) of initial Msg3 transmissions, a separate first RACH resource and / or first preamble set is configured, i.e., the feature set or feature combination corresponding to the first RACH resource and / or first preamble set includes the feature of blind scheduling (grant monitoring) of initial Msg3 transmissions (in NTN);

[0278] b) the first RACH resource and / or the first preamble set configuration may only appear in the NTN cell;

[0279] c) The first RACH resource and / or first preamble set configuration information is configured to the UE via broadcast (such as SIBx) or UE-specific signaling (such as RRC signaling).

[0280] 2. During random access, the UE determines the resources used to transmit Msg1 based on whether it supports blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3:

[0281] a) If the UE supports blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3, the UE uses the first RACH resource and / or the RO and / or preamble in the first preamble set to send Msg1;

[0282] b) If the UE does not support blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3, the UE uses the RO and / or preamble in the second RACH resource and / or the second preamble set to send Msg1, and the featureCombination corresponding to the second RACH resource and / or the second preamble set does not include the feature of blind scheduling (grant monitoring) for the initial transmission of Msg3 (in NTN).

[0283] FIG10 is a flow chart of another communication method provided in an embodiment of the present application. As shown in FIG10 , the network device is configured with at least one of the following:

[0284] a first RACH configuration and / or a first preamble set;

[0285] A second RACH configuration and / or a second preamble set.

[0286] In this way, the UE that supports blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3 uses the first RACH configuration and / or the first preamble set to send Msg1, and / or the UE that does not support blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3 uses the second RACH configuration and / or the second preamble set to send Msg1.

[0287] Optionally, in any embodiment of the present application, the UE uses the first RACH configuration and / or the first preamble set to send Msg1, which may include: the UE uses the first RO in the first RACH and / or the first preamble in the first preamble set to send Msg1.

[0288] Optionally, in any embodiment of the present application, the UE uses the second RACH configuration and / or the second preamble set to send Msg1, which may include: the UE uses the second RO in the second RACH and / or the second preamble in the second preamble set to send Msg1.

[0289] Example 2:

[0290] In the NTN cell, the network device configures a separate first RACH resource and / or a first preamble set for the UE that supports blind scheduled retransmission (grant monitoring) of the initial transmission of Msg3 and has a need to monitor the blind scheduled retransmission grant of the initial transmission of Msg3, as well as a first RSRP threshold for the UE to determine whether to request or monitor the blind scheduled retransmission grant of the initial transmission of Msg3. When the RSRP measurement result of the UE that supports blind scheduled retransmission grant monitoring of the initial transmission of Msg3 is less than (or equal to) the first RSRP threshold, the UE uses the first RACH resource and / or the first preamble set to send Msg1, thereby informing the network device that the UE can receive the blind scheduled retransmission grant for the initial transmission of Msg3.

[0291] The specific implementation process is as follows:

[0292] 1. The UE receives RACH configuration information from the network device, including:

[0293] a) For UEs that support blind scheduling and retransmission (grant monitoring) of initial Msg3 transmission, a separate first RACH resource and / or first preamble set is configured, i.e., the feature combination corresponding to the first RACH resource and / or first preamble set includes blind scheduling (grant monitoring) of initial Msg3 transmission (in NTN);

[0294] b) A first RSRP threshold for the UE to determine whether to request or monitor blind scheduled retransmissions (grant monitoring) of the initial transmission of Msg3. Further, the first RSRP threshold may be one of the following options:

[0295] Option 1: Introduce a separate RSRP threshold parameter;

[0296] Option 2: Reuse the RSRP threshold parameter rsrp-ThresholdMsg3 used by the UE in related technologies to determine whether to request Msg3 repetition (Msg3 repeated transmission);

[0297] Option 3: Introduce two separate RSRP threshold parameters, the two RSRP thresholds are respectively for UEs that support / request Msg3 repeated transmission and UEs that do not support / request Msg3 repeated transmission;

[0298] c) the first RACH resource and / or the first preamble set configuration may only appear in the NTN cell;

[0299] d) The above configuration information is configured to the UE via broadcast (such as SIBx) or UE-specific signaling (such as RRC signaling).

[0300] 2. During random access, the UE determines the resources for transmitting Msg1 based on whether it supports blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3 and the RSRP measurement result:

[0301] a) If the UE supports blind scheduled retransmission (grant monitoring) for the initial transmission of Msg3, and the RSRP measurement value of the UE is less than (or equal to) the first RSRP threshold, the UE uses the first RACH resource and / or the RO and / or preamble in the first preamble set to send Msg1;

[0302] b) Otherwise (i.e., if the UE does not support blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3, or the RSRP measurement value of the UE is greater than (or equal to) the first RSRP threshold), the UE uses the second RACH resource and / or RO and / or preamble in the second preamble set to send Msg1, and the featureCombination corresponding to the second RACH resource and / or the second preamble set does not include blind scheduling (grant monitoring) for the initial transmission of Msg3 (in NTN).

[0303] FIG11 is a flow chart of another communication method provided in an embodiment of the present application. As shown in FIG11 , the network device is configured with at least one of the following:

[0304] a first RACH configuration and / or a first preamble set;

[0305] a second RACH configuration and / or a second preamble set;

[0306] The first RSRP threshold.

[0307] In this way, if the UE supports blind scheduled retransmission (grant monitoring) for the initial transmission of Msg3 and the RSRP measurement amount of the UE is less than (or equal to) the first RSRP threshold, the UE uses the first RACH configuration and / or the first preamble set to send Msg1, and / or, if the UE does not support blind scheduled retransmission (grant monitoring) for the initial transmission of Msg3, or the RSRP measurement amount of the UE is greater than (or equal to) the first RSRP threshold, the UE uses the second RACH configuration and / or the second preamble set to send Msg1.

[0308] Example 3:

[0309] A feature priority parameter (i.e., the first priority mentioned above) is introduced for the characteristic of blind scheduling (grant monitoring) of the initial transmission of Msg3 (in NTN). The function of the feature priority is that in random access when multiple features are applicable (triggered) at the same time, the UE selects RACH resources and / or preamble according to the feature priorities of these multiple features.

[0310] The specific implementation process is as follows:

[0311] 1. The UE receives the configuration information of the network device, including:

[0312] a) The feature priority of the blind scheduling (grant monitoring) feature for the initial transmission of Msg3;

[0313] b) Furthermore, the feature priority of the blind scheduling (grant monitoring) feature for the initial transmission of Msg3 only appears when the first RACH resource and / or the first preamble set of the blind scheduling (grant monitoring) feature for the initial transmission of Msg3 is configured;

[0314] c) Optionally, when a network device is configured with both the feature priority of the Msg3 repetition feature and the feature priority of the blind scheduling (grant monitoring) feature for Msg3 initial transmission, the feature priority of the Msg3 repetition feature configured on the network device must be higher than the feature priority of the blind scheduling (grant monitoring) feature for Msg3 initial transmission (i.e., the feature priority of the Msg3 repetition feature is lower than the feature priority of the blind scheduling (grant monitoring) feature for Msg3 initial transmission);

[0315] 2. During the random access process, if the current random access is simultaneously applicable to the blind scheduling (grant monitoring) feature for the initial transmission of Msg3 (in NTN) and other features (such as at least one of RedCap, SDT, Msg3 Repetition, etc.), that is, the current random access is simultaneously triggered by the blind scheduling (grant monitoring) feature for the initial transmission of Msg3 (in NTN) and at least one other feature:

[0316] If no RACH resource set can be used to indicate all the characteristics that trigger this random access procedure, and at least one RACH resource set can be used to indicate some of the characteristics that trigger this random access procedure, the UE selects an available resource set from the RACH resource sets that can be used to indicate some of the characteristics that trigger this random access procedure based on the characteristic priorities of these characteristics.

[0317] An embodiment of the present application provides a method for a terminal device in an NTN to assist a network device in scheduling Msg3. Aiming at the blind scheduling retransmission (grant monitoring) characteristics of the initial transmission of Msg3 in the NTN, a separate RACH resource and / or preamble set is introduced. When the terminal device has the ability to monitor the blind scheduling retransmission Grant for the initial transmission of Msg3 and / or has the need for blind scheduling retransmission for the initial transmission of Msg3, it sends Msg1 by using the separate RACH and / or preamble resources. Using this method, on the one hand, the network device can be informed of whether the terminal device has this capability, thereby assisting the network device in making scheduling decisions; on the other hand, the terminal device only monitors the blind scheduling retransmission grant for the initial transmission of Msg3 when the channel quality is poor, thereby avoiding unnecessary PDCCH monitoring and saving power consumption of the terminal device.

[0318] In the embodiment of the present application, the network device configures a separate RACH resource and / or preamble set configuration for the blind scheduling retransmission (grant monitoring) feature of the initial transmission of Msg3 in the NTN.

[0319] In the embodiment of the present application, the UE that supports blind scheduling of retransmission grant for initial transmission of Msg3 uses the separate RACH resource and / or preamble set to send Msg1.

[0320] In the embodiment of the present application, the network device configuration information also includes a first RSRP threshold for the UE to determine whether to request or monitor the blind scheduling retransmission grant of the initial transmission of Msg3.

[0321] In an embodiment of the present application, the UE that supports blind scheduling of retransmission grant for initial transmission of Msg3 sends Msg1 using the separate RACH resource and / or preamble set when the RSRP measurement result is less than (or equal to) the first RSRP threshold.

[0322] In an embodiment of the present application, a feature priority parameter is introduced for the characteristic of blind scheduling (grant monitoring) of the initial transmission of Msg3 (in NTN). The function of the feature priority is that in random access when multiple features are applicable (or triggered) at the same time, the UE selects RACH resources and / or preamble according to the feature priorities of these multiple features.

[0323] The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, the technical solution of the present application can be subjected to a variety of simple modifications, and these simple modifications all fall within the scope of protection of the present application. For example, the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present application will no longer describe the various possible combinations separately. For another example, the various different embodiments of the present application can also be arbitrarily combined, as long as they do not violate the idea of ​​the present application, they should also be regarded as the contents disclosed in the present application. For another example, under the premise of no conflict, the various embodiments and / or the technical features in each embodiment described in the present application can be arbitrarily combined with the prior art, and the technical solution obtained after the combination should also fall within the scope of protection of the present application.

[0324] It should also be understood that in the various method embodiments of the present application, the sequence numbers of the above-mentioned processes do not imply a precedence in the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. In addition, in the embodiments of the present application, the terms "downlink," "uplink," and "sidelink" are used to indicate the transmission direction of signals or data, where "downlink" is used to indicate the first direction of transmission of signals or data from a site to a user equipment in a cell, "uplink" is used to indicate the second direction of transmission of signals or data from a user equipment in a cell to a site, and "sidelink" is used to indicate the third direction of transmission of signals or data from user equipment 1 to user equipment 2. For example, "downlink signal" indicates that the transmission direction of the signal is the first direction. In addition, in the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. Specifically, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0325] FIG12 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application, which is applied to a terminal device. As shown in FIG12 , the communication device 1200 includes:

[0326] The determining unit 1201 is configured to determine resources and / or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of grant for blind scheduling retransmission of Msg3.

[0327] In some embodiments, the communication device 1200 further includes: a communication unit 1202, configured to send Msg1 using determined resources and / or preamble.

[0328] In some embodiments, the communication unit 1202 is further configured to: when the terminal device supports blind scheduled retransmission of Msg3 or supports grant monitoring of blind scheduled retransmission of Msg3, use the first random access channel opportunity RO and / or the first preamble to send the Msg1.

[0329] In some embodiments, the communication unit 1202 is further configured to: send the Msg1 using a second RO and / or a second preamble when the terminal device does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3.

[0330] In some embodiments, the communication unit 1202 is further configured to:

[0331] receiving configuration information of the first RO and / or the first preamble;

[0332] receiving configuration information of the second RO and / or the second preamble;

[0333] receiving configuration information of a first random access channel (RACH) resource and / or a first preamble set; wherein the first RACH resource includes the first RO, and the first preamble set includes the first preamble;

[0334] Configuration information of a second RACH resource and / or a second preamble set is received; the second RACH resource includes the second RO, and the second preamble set includes the second preamble.

[0335] In some embodiments, the determining unit 1201 is further configured to:

[0336] Determine the second RO according to the first RO;

[0337] Determine the first RO according to the second RO;

[0338] Determining the second preamble according to the first preamble;

[0339] Determining the first preamble according to the second preamble;

[0340] determining the second RACH resource according to the first RACH resource;

[0341] determining the first RACH resource according to the second RACH resource;

[0342] Determine the second preamble set according to the first preamble set;

[0343] The first preamble set is determined according to the second preamble set.

[0344] In some embodiments, the first RO and / or the first preamble corresponds to a non-terrestrial communication network NTN; and / or,

[0345] The first RACH resource and / or the first preamble set corresponds to the NTN; and / or,

[0346] The second RO and / or the second preamble corresponds to NTN; and / or,

[0347] The second RACH resource and / or the second preamble set corresponds to the NTN.

[0348] In some embodiments, at least one of the first RO, the first preamble, the second RO, and the second preamble is configured to the terminal device via a broadcast message or terminal device-specific signaling; and / or

[0349] At least one of the first RACH resource, the first preamble set, the second RACH resource, and the second preamble set is configured to the terminal device through a broadcast message or signaling dedicated to the terminal device.

[0350] In some embodiments, the determination unit 1201 is further used to determine the resources and / or preamble used to send the Msg1 based on whether the terminal device supports blind scheduling retransmission of Msg3 or whether it supports blind scheduling retransmission grant monitoring of Msg3, and the reference signal measurement result of the terminal device in the current serving cell.

[0351] In some embodiments, the communication unit 1202 is further used to: when the terminal device supports blind scheduled retransmission of Msg3 or supports blind scheduled retransmission grant monitoring of Msg3, and the reference signal measurement result is less than or equal to the first threshold, use the first RO and / or the first preamble to send the Msg1.

[0352] In some embodiments, the communication unit 1202 is further used to: when the terminal device does not support blind scheduled retransmission of Msg3 or does not support blind scheduled retransmission grant monitoring of Msg3, and / or when the reference signal measurement result is greater than or equal to the first threshold, use the second RO and / or second preamble to send the Msg1.

[0353] In some embodiments, the communication unit 1202 is further used to: when the terminal device supports / requests repeated transmission of Msg3, supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and when the reference signal measurement result is less than or equal to the second threshold, use the first RO and / or the first preamble to send the Msg1.

[0354] In some embodiments, the communication unit 1202 is further used to: when the terminal device supports / requests repeated transmission of Msg3, and does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, and / or when the reference signal measurement result is greater than or equal to the second threshold, use the second RO and / or second preamble to send the Msg1.

[0355] In some embodiments, the communication unit 1202 is further used to: when the terminal device does not support / request repeated transmission of Msg3, supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and when the reference signal measurement result is less than or equal to a third threshold, use the first RO and / or the first preamble to send the Msg1.

[0356] In some embodiments, the communication unit 1202 is further used to: when the terminal device does not support / request repeated transmission of Msg3, and does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, and / or when the reference signal measurement result is greater than or equal to a third threshold, use a second RO and / or a second preamble to send the Msg1.

[0357] In some embodiments, the communication unit 1202 is further configured to receive at least one of the following: a first threshold, a second threshold, and a third threshold.

[0358] In some embodiments, at least one of the first threshold, the second threshold, and the third threshold is a predefined threshold, or a threshold specified by a protocol, or is configured to the terminal device through a broadcast message or dedicated signaling to the terminal device.

[0359] In some embodiments, the first threshold is a threshold used by the terminal device to determine whether to request repeated transmission of Msg3.

[0360] In some embodiments, the characteristic priority of the first characteristic corresponding to the blind scheduled retransmission of the Msg3 or the blind scheduled retransmission grant monitoring of the Msg3 is the first priority; the first priority is used to determine the resources and / or preamble used to send the Msg1 in the case of random access to which multiple characteristics are applicable / triggered; the multiple characteristics include the first characteristic.

[0361] In some embodiments, the communication unit 1202 is further configured to: receive the first priority configuration; and / or receive a priority configuration of at least one characteristic other than the first characteristic.

[0362] In some embodiments, the second priority is higher than the first priority, or the value of the second priority is lower than the first priority;

[0363] The second priority is the characteristic priority of the second characteristic corresponding to the repeated transmission of Msg3.

[0364] In some embodiments, the communication unit 1202 is further used to: when random access is applicable to both the first feature and at least one feature other than the first feature, or when random access is triggered by the first feature and at least one feature other than the first feature, use a third RO and / or a third preamble to send the Msg1, wherein a third RACH resource includes the third RO, a third preamble set includes the third preamble, and the third RACH resource and / or the third preamble set is used to indicate all features that trigger the random access.

[0365] In some embodiments, the communication unit 1202 is further configured to: when random access is applicable to both the first feature and at least one feature other than the first feature, or when random access is triggered by the first feature and at least one feature other than the first feature, and there is no third RACH resource and / or third preamble set for indicating that all features of the random access are triggered, and there is at least one fourth RACH resource and / or fourth preamble set for indicating that some of all features of the random access are triggered, select a fourth RACH resource and / or a fourth preamble set from at least one fourth RACH resource and / or at least one fourth preamble set according to the first priority and the priority of each feature of the at least one feature, and send the Msg1 using a fourth RACH and / or fourth preamble;

[0366] The fourth RO and / or fourth preamble is included in the selected fourth RACH resource and / or a fourth preamble set.

[0367] In some embodiments, the communication device 1200 further includes a monitoring unit 1203 configured to:

[0368] When the terminal device uses the first RO and / or the first preamble to send the Msg1, monitor the blind scheduling retransmission grant of Msg3; and / or,

[0369] When the terminal device uses the second RO and / or the second preamble to send the Msg1, it does not monitor the blind scheduling retransmission grant of Msg3.

[0370] FIG13 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application, which is applied to a terminal device. As shown in FIG13 , the communication device 1300 includes:

[0371] The determining unit 1301 is configured to determine whether the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of the blind scheduling retransmission grant of Msg3 according to the resources and / or preamble corresponding to the received Msg1.

[0372] In some embodiments, the communication device 1300 further includes a communication unit 1302 configured to receive Msg1.

[0373] In some embodiments, the determining unit 1301 is further used to: when the Msg1 corresponds to the first random access channel opportunity RO and / or the first preamble, determine that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3.

[0374] In some embodiments, the determining unit 1301 is further configured to: determine that the terminal device does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3 when the Msg1 corresponds to the second RO and / or the second preamble.

[0375] In some embodiments, the communication unit 1302 is further configured to:

[0376] Sending configuration information of the first RO and / or the first preamble;

[0377] Sending configuration information of the second RO and / or the second preamble;

[0378] Sending configuration information of a first random access channel RACH resource and / or a first preamble set; the first RACH resource includes the first RO, and the first preamble set includes the first preamble;

[0379] Send configuration information of a second RACH resource and / or a second preamble set; the second RACH resource includes the second RO, and the second preamble set includes the second preamble.

[0380] In some embodiments, the first RO and / or the first preamble corresponds to a non-terrestrial communication network NTN; and / or,

[0381] The first RACH resource and / or the first preamble set corresponds to the NTN; and / or,

[0382] The second RO and / or the second preamble corresponds to NTN; and / or,

[0383] The second RACH resource and / or the second preamble set corresponds to the NTN.

[0384] In some embodiments, the communication unit 1302 is further configured to: send a broadcast message or the terminal device-specific signaling;

[0385] The broadcast message or the terminal device dedicated signaling includes or indicates at least one of the following: the first RO, the first preamble, the second RO, the second preamble, or,

[0386] The broadcast message or the terminal device dedicated signaling includes or indicates at least one of the following: a first RACH resource, a first preamble set, a second RACH resource, and a second preamble set.

[0387] In some embodiments, the determination unit 1301 is further used to: when the Msg1 corresponds to the first RO and / or the first preamble, determine that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, and determine that the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the first threshold.

[0388] In some embodiments, the determination unit 1301 is further used to: when the Msg1 corresponds to the second RO and / or the second preamble, determine that the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3, and / or determine that the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the first threshold.

[0389] In some embodiments, the determining unit 1301 is further configured to: when the Msg1 corresponds to the first RO and / or the first preamble, determine one of the following:

[0390] The terminal device supports / requests repeated transmission of Msg3, supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the second threshold;

[0391] The terminal device does not support / request repeated transmission of Msg3, supports blind scheduled retransmission of Msg3 or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the third threshold.

[0392] In some embodiments, the determining unit 1301 is further configured to: when the Msg1 corresponds to the second RO and / or the second preamble, determine one of the following:

[0393] The terminal device supports / requests repeated transmission of Msg3, and does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, and / or the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the second threshold;

[0394] The terminal device does not support / request repeated transmission of Msg3, and does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, and / or the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the third threshold.

[0395] In some embodiments, the communication unit 1302 is further configured to send at least one of the following: a first threshold, a second threshold, and a third threshold.

[0396] In some embodiments, at least one of the first threshold, the second threshold, and the third threshold is a predefined threshold, or a threshold specified by a protocol, or is configured to the terminal device through a broadcast message or dedicated signaling to the terminal device.

[0397] In some embodiments, the first threshold is a threshold used by the terminal device to determine whether to request repeated transmission of Msg3.

[0398] In some embodiments, the characteristic priority of the first characteristic corresponding to the blind scheduled retransmission of the Msg3 or the blind scheduled retransmission grant monitoring of the Msg3 is the first priority; the first priority is used to determine the resources and / or preamble used to send the Msg1 in the case of random access to which multiple characteristics are applicable / triggered; the multiple characteristics include the first characteristic.

[0399] In some embodiments, the communication unit 1302 is further configured to: send the first priority configuration; and / or send a priority configuration of at least one characteristic other than the first characteristic.

[0400] In some embodiments, the second priority is higher than the first priority, or the value of the second priority is smaller than the first priority; the second priority is the characteristic priority of the second characteristic corresponding to the repeated transmission of Msg3.

[0401] In some embodiments, the determining unit 1301 is further configured to: determine, based on the third RO and / or third preamble corresponding to the received Msg1, that random access is applicable to both the first feature and at least one feature other than the first feature, or determine that random access is triggered by the first feature and at least one feature other than the first feature;

[0402] The third RACH resource includes the third RO, the third preamble set includes the third preamble, and the third RACH resource and / or the third preamble set are used to indicate all characteristics of triggering the random access.

[0403] In some embodiments, the determining unit 1301 is further configured to: determine, based on the fourth RO and / or fourth preamble corresponding to the received Msg1, that random access is applicable to some characteristics, or determine that random access is triggered by some characteristics; the some characteristics are a subset of all characteristics, and all characteristics include the first characteristic and at least one characteristic other than the first characteristic;

[0404] The fourth RO and / or fourth preamble are included in a fourth RACH resource and / or a fourth preamble set;

[0405] The fourth RACH resource and / or the fourth preamble set are selected from at least one fourth RACH resource and / or at least one fourth preamble set;

[0406] The at least one fourth RACH resource and / or the at least one fourth preamble set are used to indicate some of all characteristics that trigger the random access.

[0407] In some embodiments, the communication unit 1302 is further configured to: send a blind scheduling retransmission grant for Msg3 when the Msg1 corresponds to the first RO and / or the first preamble.

[0408] In some embodiments, the communication unit 1302 is further configured to: when the Msg1 corresponds to the second RO and / or the second preamble, not send the blind scheduling retransmission grant of the Msg3.

[0409] Those skilled in the art should understand that the relevant description of the above-mentioned communication device in the embodiment of the present application can be understood with reference to the relevant description of the communication method in the embodiment of the present application.

[0410] Figure 14 is a schematic structural diagram of a communication device provided in an embodiment of the present application. The communication device 1400 may include one of the following: a terminal device or a network device. The communication device 1400 shown in Figure 14 may include a processor 1410 and a memory 1420. The memory 1420 is configured to store a computer program, and the processor 1410 is configured to call and execute the computer program stored in the memory 1410, causing the terminal device to execute any of the aforementioned methods or causing the network device to execute any of the aforementioned methods.

[0411] Optionally, the memory 1420 may be a separate device independent of the processor 1410 , or may be integrated into the processor 1410 .

[0412] In some embodiments, as shown in FIG14 , the communication device 1400 may further include a transceiver 1430 , and the processor 1410 may control the transceiver 1430 to communicate with other devices. Specifically, the transceiver 1430 may send information or data to other devices, or receive information or data sent by other devices.

[0413] The transceiver 1430 may include a transmitter and a receiver. The transceiver 1430 may further include an antenna, and the number of antennas may be one or more.

[0414] In some embodiments, the communication device 1400 may specifically be a network device of an embodiment of the present application, and the communication device 1400 may implement the corresponding processes implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, they will not be repeated here.

[0415] In some embodiments, the communication device 1400 may specifically be a terminal device of an embodiment of the present application, and the communication device 1400 may implement the corresponding processes implemented by the terminal device in each method of the embodiment of the present application. For the sake of brevity, they will not be repeated here.

[0416] An embodiment of the present application further provides a computer storage medium, which stores one or more programs. The one or more programs can be executed by one or more processors to implement the communication method in any embodiment of the present application.

[0417] In some embodiments, the computer-readable storage medium can be applied to the terminal device or network device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the terminal device or network device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0418] Figure 15 is a schematic structural diagram of a chip according to an embodiment of the present application. The chip 1500 shown in Figure 15 includes a processor 1510, which is configured to call and run a computer program from a memory to execute a method according to any embodiment of the present application.

[0419] In some embodiments, as shown in FIG15 , the chip 1500 may further include a memory 1520. The processor 1510 may call and execute a computer program from the memory 1520 to implement the method in the embodiment of the present application.

[0420] The memory 1520 may be a separate device independent of the processor 1510 , or may be integrated into the processor 1510 .

[0421] In some embodiments, the chip 1500 may further include an input interface 1530. The processor 1510 may control the input interface 1530 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0422] In some embodiments, the chip 1500 may further include an output interface 1540. The processor 1510 may control the output interface 1540 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0423] In some embodiments, the chip can be applied to the network device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the network device in each method of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0424] In some embodiments, the chip can be applied to the terminal device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0425] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0426] An embodiment of the present application also provides a computer program product, which includes a computer storage medium, the computer storage medium storing a computer program, and the computer program including instructions that can be executed by at least one processor. When the instructions are executed by the at least one processor, the communication method in any embodiment of the present application is implemented.

[0427] In some embodiments, the computer program product can be applied to the terminal device or network device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the terminal device or network device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0428] Optionally, the computer program product in the embodiments of the present application may also be referred to as a software product in other embodiments.

[0429] An embodiment of the present application further provides a computer program, which enables a computer to execute the communication method in any embodiment of the present application.

[0430] In some embodiments, the computer program can be applied to the terminal device or network device in the embodiments of the present application. When the computer program runs on the computer, the computer executes the corresponding processes implemented by the terminal device or network device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0431] The processor, communication device or chip of the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above-mentioned method embodiment can be completed by the integrated logic circuit of the hardware in the processor or the instruction in the form of software. The above-mentioned processor, communication device or chip may include any one or more of the following integrations: general-purpose processor, application-specific integrated circuit (ASIC), digital signal processor (DSP), digital signal processing device (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), central processing unit (CPU), graphics processing unit (GPU), embedded neural network processor (neural-network processing units, NPU), controller, microcontroller, microprocessor, programmable logic device, discrete gate or transistor logic device, discrete hardware component. Each method, step and logic block diagram disclosed in the embodiment of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiments of this application can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium well-known in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in the memory, and the processor reads the information in the memory and, in conjunction with its hardware, completes the steps of the above method.

[0432] It is understood that the memory or computer storage medium in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0433] It should be understood that the above-mentioned memory or computer storage medium is exemplary but not restrictive. For example, the memory in the embodiments of the present application may also be static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM RAM (DR RAM), etc. In other words, the memory in the embodiments of the present application is intended to include, but is not limited to, these and any other suitable types of memory.

[0434] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0435] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0436] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0437] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0438] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0439] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0440] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A communication method, comprising: The terminal device determines the resources and / or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3.

2. The method according to claim 1, further comprising: In a case where the terminal device supports blind scheduled retransmission of Msg3 or supports blind scheduled retransmission grant monitoring of Msg3, the terminal device uses a first random access channel opportunity RO and / or a first preamble to send the Msg1; and / or, In a case where the terminal device does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, the terminal device uses a second RO and / or a second preamble to send the Msg1.

3. The method according to claim 2, further comprising at least one of the following: The terminal device receives configuration information of the first RO and / or the first preamble; The terminal device receives configuration information of the second RO and / or the second preamble; The terminal device determines the second RO according to the first RO; The terminal device determines the first RO according to the second RO; The terminal device determines the second preamble according to the first preamble; The terminal device determines the first preamble according to the second preamble; The terminal device receives configuration information of a first random access channel RACH resource and / or a first preamble set; the first RACH resource includes the first RO, and the first preamble set includes the first preamble; The terminal device receives configuration information of a second RACH resource and / or a second preamble set; the second RACH resource includes the second RO, and the second preamble set includes the second preamble; The terminal device determines the second RACH resource according to the first RACH resource; The terminal device determines the first RACH resource according to the second RACH resource; The terminal device determines the second preamble set according to the first preamble set; The terminal device determines the first preamble set according to the second preamble set.

4. The method according to claim 2 or 3, The first RO and / or the first preamble corresponds to a non-terrestrial communication network NTN; and / or, The first RACH resource and / or the first preamble set corresponds to the NTN; and / or, The second RO and / or the second preamble corresponds to NTN; and / or, The second RACH resource and / or the second preamble set corresponds to the NTN.

5. The method according to any one of claims 2 to 4, At least one of the first RO, the first preamble, the second RO, and the second preamble is configured to the terminal device through a broadcast message or terminal device-specific signaling; and / or, At least one of the first RACH resource, the first preamble set, the second RACH resource, and the second preamble set is configured to the terminal device through a broadcast message or signaling dedicated to the terminal device.

6. The method according to any one of claims 1 to 5, wherein the terminal device determines resources and / or preamble for sending Msg1 according to whether the terminal device supports blind scheduled retransmission of Msg3 or whether the terminal device supports blind scheduled retransmission grant monitoring of Msg3, comprising: The terminal device determines the resources and / or preamble for sending the Msg1 based on whether the terminal device supports blind scheduled retransmission of Msg3 or whether it supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell.

7. The method according to claim 6, further comprising: When the terminal device supports blind scheduled retransmission of Msg3 or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result is less than or equal to the first threshold, the terminal device uses the first RO and / or the first preamble to send the Msg1; and / or, When the terminal device does not support blind scheduled retransmission of Msg3 or does not support blind scheduled retransmission grant monitoring of Msg3, and / or the reference signal measurement result is greater than or equal to the first threshold, the terminal device uses the second RO and / or second preamble to send the Msg1.

8. The method according to claim 6, further comprising: When the terminal device supports / requests repeated transmission of Msg3, supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result is less than or equal to the second threshold, the terminal device uses the first RO and / or the first preamble to send the Msg1; and / or, When the terminal device supports / requests repeated transmission of Msg3 and does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, and / or when the reference signal measurement result is greater than or equal to the second threshold, the terminal device uses the second RO and / or the second preamble to send the Msg1; and / or, When the terminal device does not support / request repeated transmission of Msg3, supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result is less than or equal to a third threshold, the terminal device uses the first RO and / or the first preamble to send the Msg1; and / or, When the terminal device does not support / request repeated transmission of Msg3, and does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, and / or when the reference signal measurement result is greater than or equal to the third threshold, the terminal device uses the second RO and / or the second preamble to send the Msg1.

9. The method according to claim 7 or 8, further comprising: The terminal device receives at least one of the following: a first threshold, a second threshold, and a third threshold.

10. According to the method described in any one of claims 7 to 9, at least one of the first threshold, the second threshold, and the third threshold is a predefined threshold, or a threshold specified by a protocol, or is configured to the terminal device through a broadcast message or dedicated signaling of the terminal device.

11. The method according to any one of claims 7, 9, and 10, wherein the first threshold is a threshold used by the terminal device to determine whether to request repeated transmission of Msg3.

12. According to the method described in any one of claims 1 to 11, the characteristic priority of the first characteristic corresponding to the blind scheduling retransmission of the Msg3 or the blind scheduling retransmission grant monitoring of the Msg3 is the first priority; the first priority is used to determine the resources and / or preamble used to send the Msg1 in the case of random access to which multiple characteristics are applicable / triggered; the multiple characteristics include the first characteristic.

13. The method according to claim 12, further comprising: The terminal device receives the first priority configuration; and / or, The terminal device receives a priority configuration of at least one characteristic other than the first characteristic.

14. The method according to claim 12 or 13, wherein the second priority is higher than the first priority, or the value of the second priority is lower than the first priority; The second priority is the characteristic priority of the second characteristic corresponding to the repeated transmission of Msg3.

15. The method according to any one of claims 12 to 14, further comprising: In a case where random access is applicable to both the first feature and at least one feature other than the first feature, or in a case where random access is triggered by the first feature and at least one feature other than the first feature, the terminal device uses a third RO and / or a third preamble to send the Msg1, wherein the third RACH resource includes the third RO, the third preamble set includes the third preamble, and the third RACH resource and / or the third preamble set are used to indicate all features that trigger the random access.

16. The method according to any one of claims 12 to 15, further comprising: When random access is applicable to both the first feature and at least one feature other than the first feature, or when random access is triggered by the first feature and at least one feature other than the first feature, and there is no third RACH resource and / or a third preamble set for indicating all features triggering the random access, and there is at least one fourth RACH resource and / or a fourth preamble set for indicating some of all features triggering the random access, the terminal device selects a fourth RACH resource and / or a fourth preamble set from at least one fourth RACH resource and / or at least one fourth preamble set according to the first priority and the priority of each feature in the at least one feature, and uses a fourth RO and / or a fourth preamble to send the Msg1; The fourth RO and / or fourth preamble is included in the selected fourth RACH resource and / or a fourth preamble set.

17. The method according to any one of claims 1 to 16, further comprising: In a case where the terminal device uses the first RO and / or the first preamble to send the Msg1, the terminal device monitors the blind scheduling retransmission grant of Msg3; and / or, In the case where the terminal device uses the second RO and / or the second preamble to send the Msg1, the terminal device does not monitor the blind scheduling retransmission grant of Msg3.

18. A communication method, the method comprising: The network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 based on the resources and / or preamble corresponding to the received Msg1.

19. The method according to claim 18, wherein the network device determines whether the terminal device supports blind scheduled retransmission of Msg3 or supports grant monitoring of blind scheduled retransmission of Msg3 based on the resources and / or preamble corresponding to the received Msg1, comprising: In a case where the Msg1 corresponds to the first random access channel opportunity RO and / or the first preamble, the network device determines that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3; and / or, In a case where the Msg1 corresponds to the second RO and / or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3.

20. The method according to claim 19, further comprising at least one of the following: The network device sends configuration information of the first RO and / or the first preamble; The network device sends configuration information of the second RO and / or the second preamble; The network device sends configuration information of a first random access channel RACH resource and / or a first preamble set; the first RACH resource includes the first RO, and the first preamble set includes the first preamble; The network device sends configuration information of a second RACH resource and / or a second preamble set; the second RACH resource includes the second RO, and the second preamble set includes the second preamble.

21. The method according to claim 19 or 20, The first RO and / or the first preamble corresponds to a non-terrestrial communication network NTN; and / or, The first RACH resource and / or the first preamble set corresponds to the NTN; and / or, The second RO and / or the second preamble corresponds to NTN; and / or, The second RACH resource and / or the second preamble set corresponds to the NTN.

22. The method according to any one of claims 19 to 21, further comprising: The network device sends a broadcast message or a dedicated signaling to the terminal device; The broadcast message or the terminal device dedicated signaling includes or indicates at least one of the following: the first RO, the first preamble, the second RO, the second preamble, or, The broadcast message or the terminal device dedicated signaling includes or indicates at least one of the following: a first RACH resource, a first preamble set, a second RACH resource, and a second preamble set.

23. The method according to any one of claims 19 to 22, wherein when the Msg1 corresponds to the first random access channel opportunity RO and / or the first preamble, the network device determines that the terminal device supports blind scheduled retransmission of Msg3 or supports blind scheduled retransmission grant monitoring of Msg3, comprising: In a case where the Msg1 corresponds to the first RO and / or the first preamble, the network device determines that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, and determines that a reference signal measurement result of the terminal device in the current serving cell is less than or equal to a first threshold; When the Msg1 corresponds to the second RO and / or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, including: When the Msg1 corresponds to the second RO and / or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3, and / or determines that the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the first threshold.

24. The method according to any one of claims 19 to 22, wherein, when the Msg1 corresponds to the first random access channel opportunity RO and / or the first preamble, the network device determines that the terminal device supports blind scheduled retransmission of Msg3 or supports blind scheduled retransmission grant monitoring of Msg3, comprising: In a case where the Msg1 corresponds to the first RO and / or the first preamble, the network device determines one of the following: The terminal device supports / requests repeated transmission of Msg3, supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the second threshold; The terminal device does not support / request repeated transmission of Msg3, supports blind scheduled retransmission of Msg3 or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the third threshold; When the Msg1 corresponds to the second RO and / or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, including: In a case where the Msg1 corresponds to the second RO and / or the second preamble, the network device determines one of the following: The terminal device supports / requests repeated transmission of Msg3, and does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, and / or the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the second threshold; The terminal device does not support / request repeated transmission of Msg3, and does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, and / or the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the third threshold.

25. The method according to claim 23 or 24, further comprising: The network device sends at least one of the following: a first threshold, a second threshold, and a third threshold.

26. According to the method described in any one of claims 23 to 25, at least one of the first threshold, the second threshold, and the third threshold is a predefined threshold, or a threshold specified by a protocol, or is configured to the terminal device through a broadcast message or dedicated signaling of the terminal device.

27. The method according to any one of claims 23, 25, and 26, wherein the first threshold is a threshold used by the terminal device to determine whether to request repeated transmission of Msg3.

28. According to the method described in any one of claims 18 to 27, the characteristic priority of the first characteristic corresponding to the blind scheduled retransmission of the Msg3 or the blind scheduled retransmission grant monitoring of the Msg3 is the first priority; the first priority is used to determine the resources and / or preamble used to send the Msg1 in the case of random access to which multiple characteristics are applicable / triggered; the multiple characteristics include the first characteristic.

29. The method according to claim 28, further comprising: The network device sends the first priority configuration; and / or, The network device sends a priority configuration of at least one characteristic other than the first characteristic.

30. The method according to claim 28 or 29, wherein the second priority is higher than the first priority, or the value of the second priority is lower than the first priority; The second priority is the characteristic priority of the second characteristic corresponding to the repeated transmission of Msg3.

31. The method according to any one of claims 28 to 30, wherein the network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 based on the resources and / or preamble corresponding to the received Msg1, comprising: The network device determines, according to the third RO and / or the third preamble corresponding to the received Msg1, that random access is applicable to both the first feature and at least one feature other than the first feature, or determines that random access is triggered by the first feature and at least one feature other than the first feature; The third RACH resource includes the third RO, the third preamble set includes the third preamble, and the third RACH resource and / or the third preamble set are used to indicate all characteristics of triggering the random access.

32. The method according to any one of claims 28 to 31, wherein the network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 based on the resources and / or preamble corresponding to the received Msg1, comprising: The network device determines, according to the fourth RO and / or fourth preamble corresponding to the received Msg1, that random access is applicable to some characteristics, or determines that random access is triggered by some characteristics; the some characteristics are a subset of all characteristics, and all characteristics include the first characteristic and at least one characteristic other than the first characteristic; The fourth RO and / or fourth preamble are included in a fourth RACH resource and / or a fourth preamble set; The fourth RACH resource and / or the fourth preamble set are selected from at least one fourth RACH resource and / or at least one fourth preamble set; The at least one fourth RACH resource and / or the at least one fourth preamble set are used to indicate some of all characteristics that trigger the random access.

33. The method according to any one of claims 18 to 32, further comprising: In the case where the Msg1 corresponds to the first RO and / or the first preamble, the network device sends a blind scheduling retransmission grant of Msg3; and / or, In the case that the Msg1 corresponds to the second RO and / or the second preamble, the network device does not send the blind scheduling retransmission grant of the Msg3.

34. A communication device comprising: The determining unit is configured to determine resources and / or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission authorization grant monitoring of Msg3.

35. A communication device comprising: The determination unit is used to determine whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission authorization grant monitoring of Msg3 based on the resources and / or preamble corresponding to the received Msg1.

36. A communication device comprising: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory, so that the terminal device executes the method described in any one of claims 1 to 17 or the network device executes the method described in any one of claims 18 to 33.

37. A computer storage medium storing one or more programs, wherein the one or more programs can be executed by one or more processors to implement the method of any one of claims 1 to 17 or any one of claims 18 to 33.

38. A chip comprising: A processor, configured to call and run a computer program from a memory to perform the method according to any one of claims 1 to 17 or any one of claims 18 to 33.

39. A computer program product, comprising a computer storage medium storing a computer program, wherein the computer program comprises instructions executable by at least one processor, and when the instructions are executed by the at least one processor, implements the method of any one of claims 1 to 17 or any one of claims 18 to 33.

40. A computer program, the computer program causing a computer to execute the method according to any one of claims 1 to 17 or any one of claims 18 to 33.

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