Communication methods, apparatus and devices and storage medium

Abstract

Communication methods, communication devices, a communication system, a storage medium and a program product. A communication method comprises: a network device sending a first message to a terminal device; and the terminal device receiving the first message, and determining the number of repeated transmissions of msg4 on the basis of the first message. On this basis, the terminal device can directly determine the number of repeated transmissions of msg4, thereby further improving msg4 transmission efficiency.

Description

Communication methods, devices, equipment and storage media Technical Field

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

[0002] As an important downlink channel in non-terrestrial networks (NTNs), the carrier-to-noise ratio (CNR) of msg4 indicates that this channel needs to be repeated 2 to 4 times to meet the cell link budget requirements for beam hopping coverage. The repetition mechanism of msg4 is still under investigation. Summary of the Invention

[0003] This disclosure provides a communication method, apparatus, device, and storage medium to improve the transmission efficiency of msg4.

[0004] In a first aspect, embodiments of this disclosure provide a communication method executed by a terminal device, the method comprising:

[0005] Receive the first message;

[0006] The number of times message msg4 is retransmitted is determined based on the first message.

[0007] Secondly, embodiments of this disclosure also provide a communication method executed by a network device, the method comprising:

[0008] Send a first message, which the terminal device uses to determine the number of times msg4 will be retransmitted.

[0009] Thirdly, embodiments of this disclosure also provide a terminal device, including:

[0010] The transceiver module is used to receive the first message;

[0011] The processing module is used to determine the number of times message msg4 will be repeatedly transmitted based on the first message.

[0012] Fourthly, embodiments of this disclosure also provide a network device, including:

[0013] The transceiver module is used to send the first message, which is used by the terminal device to determine the number of times msg4 can be repeatedly transmitted based on the first message.

[0014] Fifthly, embodiments of this disclosure also provide a terminal device, including:

[0015] One or more processors;

[0016] The network device is used to perform the method described in the first aspect of the embodiments of this disclosure.

[0017] Sixthly, embodiments of this disclosure also provide a network device, including:

[0018] One or more processors;

[0019] The terminal device is used to execute the method described in the first aspect of the embodiments of this disclosure.

[0020] In a seventh aspect, embodiments of this disclosure also provide a communication system, including a network device and a terminal device;

[0021] The terminal device is configured to implement the method described in the first aspect, and the network device is configured to implement the method described in the second aspect.

[0022] Eighthly, embodiments of this disclosure also provide a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform the communication method as described in the first aspect of this disclosure, or to perform the communication method as described in the second aspect of this disclosure.

[0023] Eighthly, embodiments of this disclosure also provide a program product, including at least one of a program and instructions, wherein when the program or instructions are executed by a communication device, they implement the communication method described in the first aspect or the communication method described in the second aspect.

[0024] In this embodiment of the disclosure, the terminal device determines the number of repeated transmissions of msg4 based on the first message, which is beneficial to improving the transmission efficiency of msg4 and reducing the impact on the code point allocation of DCI, as well as reducing the dependence on DCI indicating the number of repeated transmissions.

[0025] Additional aspects and advantages of embodiments of this disclosure will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this disclosure. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings required for the description of the embodiments are introduced below. The following drawings are only some embodiments of this disclosure and do not impose specific limitations on the protection scope of this disclosure.

[0027] Figure 1 is a schematic diagram of the architecture of the communication system provided in an embodiment of this disclosure;

[0028] Figure 2 is one of the interactive schematic diagrams of the communication method provided in the embodiments of this disclosure;

[0029] Figure 3 is a second interactive schematic diagram of the communication method provided in the embodiments of this disclosure;

[0030] Figure 4 is a flowchart illustrating one of the communication methods provided in this embodiment of the present disclosure;

[0031] Figure 5 is a second schematic flowchart of the communication method provided in this embodiment of the present disclosure;

[0032] Figure 6 is a schematic diagram of the structure of the terminal device provided in an embodiment of this disclosure;

[0033] Figure 7 is a schematic diagram of the structure of the network device provided in an embodiment of this disclosure;

[0034] Figure 8 is a schematic diagram of the structure of the communication device provided in an embodiment of this disclosure;

[0035] Figure 9 is a schematic diagram of the chip structure proposed in an embodiment of this disclosure. Detailed Implementation

[0036] This disclosure provides a communication method, apparatus, device, and storage medium.

[0037] In a first aspect, embodiments of this disclosure provide a communication method executed by a terminal device, the method comprising:

[0038] Receive the first message;

[0039] The number of times message msg4 is repeated is determined based on the first message mentioned above.

[0040] In the above embodiments, the terminal device can determine the number of times msg4 is repeatedly transmitted based on the received first message, thereby optimizing resource allocation and transmission efficiency of msg4 during the communication process.

[0041] In conjunction with some embodiments of the first aspect, in some embodiments, the first message is used to indicate a first range of the number of times the msg4 is repeatedly transmitted or the number of times the msg4 is repeatedly transmitted.

[0042] In the above embodiments, the terminal device can directly determine the number of times msg4 is repeatedly transmitted, or it can determine the number of times msg4 is repeatedly transmitted by a first range of the number of times msg4 is repeatedly transmitted, which enhances the flexibility and configurability of communication and thus improves the transmission efficiency of msg4.

[0043] In conjunction with some embodiments of the first aspect, in some embodiments, in response to the first message used to indicate the first range, the first message includes at least one of the main information block MIB or system information block 1SIB1.

[0044] In the above embodiments, information about the number of times msg4 is repeatedly transmitted is carried through MIB or SIB1, which utilizes the existing system information broadcasting mechanism without introducing new signaling, reducing system complexity, saving signaling resources, and helping to reduce dependence on DCI code points.

[0045] In conjunction with some embodiments of the first aspect, in some embodiments, the MIB indicates the first range through first identification information, the first identification information including at least one of the following:

[0046] At least one bit in the kssb field;

[0047] Reserved bits of the above MIB;

[0048] Unused code points in the pdcch-configSIB1 field.

[0049] In the above embodiments, reusing the existing field information of the MIB to indicate the first range of the number of repeated transmissions of msg4 or the number of repeated transmissions of msg4 is beneficial to saving signaling resources and improving indication efficiency.

[0050] In conjunction with some embodiments of the first aspect, in some embodiments, in response to the first message used to indicate the first range, the method further includes:

[0051] Receive first downlink control information (DCI), the first DCI being used to schedule the transmission of msg4;

[0052] The first DCI is obtained by the network device through cyclic redundancy check (CRC) scrambling based on the second temporary cell radio network temporary identifier (TC-RNTI). The second TC-RNTI is determined by the network device based on the first TC-RNTI allocated to the terminal device and the number of repeated transmissions of msg4.

[0053] The determination of the number of times message msg4 is repeatedly transmitted based on the first message includes:

[0054] Based on the first TC-RNTI and the first DCI mentioned above, the number of repeated transmissions of msg4 is determined within the first range.

[0055] In the above embodiments, when the network device indicates the repetition range of msg4 and the first DCI is scrambled by the second TC-RNTI, the terminal device can directly determine the number of repetitions of msg4 within the first range based on the first TC-RNTI and the first DCI, thereby realizing the determination of the number of repetitions of msg4 without relying on the DCI indication, thereby reducing the dependence on the DCI code point and maintaining the flexibility of the indication.

[0056] In conjunction with some embodiments of the first aspect, in some embodiments, the first scope described above includes at least one of the following:

[0057] Repeat once or repeat twice;

[0058] Repeat once, repeat twice, or repeat four times;

[0059] Repeat once, repeat twice, repeat four times, or repeat eight times.

[0060] In the above embodiments, low repetition counts are suitable for high signal-to-noise ratio scenarios to reduce latency, while high repetition counts can be used for extreme coverage scenarios. This is beneficial for supporting network devices to expand the repetition count range as needed to adapt to future enhancement requirements.

[0061] In conjunction with some embodiments of the first aspect, in some embodiments, in response to the first message used to indicate the number of repeated transmissions of the msg4, the first message is a first DCI used to schedule the transmission of msg4, the first message is obtained by the network device by CRC scrambling based on the first TC-RNTI or the second TC-RNTI allocated to the terminal device, and the second TC-RNTI is determined by the network device based on the first TC-RNTI and the number of repeated transmissions of the msg4.

[0062] In the above embodiments, the network device can indicate the number of times msg4 is repeatedly transmitted through the DCI during the random access process, which is beneficial for quickly determining the number of times msg4 is repeatedly transmitted during the random access process and improving the transmission efficiency of msg4. At the same time, the network device can scramble the first DCI through the first TC-RNTI and the second TC-RNTI, which is beneficial for maintaining the scrambling flexibility of the DCI.

[0063] In conjunction with some embodiments of the first aspect, in some embodiments, the format of the second TC-RNTI described above includes at least one of the following: D+x; D*y+x;

[0064] Where D is the first TC-RNTI mentioned above, and y is a preset coefficient;

[0065] The format of the second TC-RNTI includes D+x, where x indicates the number of repeated transmissions of msg4 minus 1; the format of the second TC-RNTI includes D*y+x, where x indicates the number of repeated transmissions of msg4.

[0066] In the above embodiments, mathematical mapping ensures a strong correlation between the second TC-RNTI and the first TC-RNTI, as well as the repetition count, avoiding repetition identifier conflicts. Preset coefficients (y) and linear operations reduce the descrambling complexity of the terminal device and decrease processing latency. Furthermore, when the first DCI passes through the second TC-RNTI and the network device indicates the transmission range of msg4 via the first message, the terminal device can simultaneously determine the repetition count of msg4 during the process of determining the second TC-RNTI from the first DCI to descramble the first DCI, improving the transmission efficiency of msg4 and avoiding the need to indicate the repetition count of msg4 via the DCI, thus reducing the utilization of DCI code points.

[0067] In conjunction with some embodiments of the first aspect, in some embodiments, the first message indicates the number of times msg4 is repeatedly transmitted through at least one of the modulation and coding scheme domain or the time domain resource allocation domain;

[0068] The number of times the msg4 is repeatedly transmitted as indicated by the first message is within the first range of the number of times the msg4 is repeatedly transmitted as determined by the network device.

[0069] In the above embodiments, the number of repeated transmissions of msg4 is indicated by the modulation and coding scheme field or the time domain resource allocation field, which makes full use of the existing DCI field without introducing new fields or signaling.

[0070] In conjunction with some embodiments of the first aspect, in some embodiments, the format of the first DCI is DCI1_0.

[0071] Secondly, embodiments of this disclosure provide a communication method executed by a network device, the method comprising:

[0072] Send a first message, which the terminal device uses to determine the number of times msg4 will be retransmitted.

[0073] In conjunction with some embodiments of the second aspect, in some embodiments, the first message is used to indicate a first range of the number of times the msg4 is repeatedly transmitted or the number of times the msg4 is repeatedly transmitted.

[0074] In conjunction with some embodiments of the second aspect, in some embodiments, in response to the first message used to indicate the first range, the first message includes at least one of MIB or SIB1.

[0075] In conjunction with some embodiments of the second aspect, in some embodiments, the MIB indicates the first range through first identification information, the first identification information including at least one of the following:

[0076] At least one bit in the kssb field;

[0077] Reserved bits of the above MIB;

[0078] Unused code points in the pdcch-configSIB1 field.

[0079] In conjunction with some embodiments of the second aspect, in some embodiments, in response to the first message used to indicate the first range, the method further includes:

[0080] Send a first DCI, which is used by the terminal device to determine the number of times the msg4 is repeatedly transmitted within the first range based on the first TC-RNTI and the first DCI allocated by the network device.

[0081] The first DCI is used to schedule the transmission of msg4. The first DCI is obtained by the network device through CRC scrambling based on the second TC-RNTI. The second TC-RNTI is determined by the network device based on the first TC-RNTI allocated to the terminal device and the number of repeated transmissions of msg4.

[0082] In conjunction with some embodiments of the second aspect, in some embodiments, the first scope described above includes at least one of the following:

[0083] Repeat once or repeat twice;

[0084] Repeat once, repeat twice, or repeat four times;

[0085] Repeat once, repeat twice, repeat four times, or repeat eight times.

[0086] In conjunction with some embodiments of the second aspect, in some embodiments, in response to the first message used to indicate the number of repeated transmissions of the msg4, the first message is a first DCI used to schedule the transmission of msg4, the first message is obtained by the network device by CRC scrambling based on the first TC-RNTI or the second TC-RNTI allocated to the terminal device, and the second TC-RNTI is determined by the network device based on the first TC-RNTI and the number of repeated transmissions of the msg4.

[0087] In conjunction with some embodiments of the second aspect, in some embodiments, the format of the second TC-RNTI described above includes at least one of the following: D+x; D*y+x;

[0088] Where D is the first TC-RNTI mentioned above, and y is a preset coefficient;

[0089] The format of the second TC-RNTI includes D+x, where x indicates the number of repeated transmissions of msg4 minus 1; the format of the second TC-RNTI includes D*y+x, where x indicates the number of repeated transmissions of msg4.

[0090] In conjunction with some embodiments of the second aspect, in some embodiments, the first message indicates the number of times the msg4 is repeatedly transmitted through at least one of the modulation and coding scheme domain or the time domain resource allocation domain;

[0091] The number of times the msg4 is repeatedly transmitted as indicated by the first message is within the first range of the number of times the msg4 is repeatedly transmitted as determined by the network device.

[0092] In conjunction with some embodiments of the second aspect, in some embodiments, the format of the first DCI described above is DCI1_0.

[0093] Thirdly, embodiments of this disclosure also provide a terminal device, including:

[0094] The transceiver module is used to receive the first message;

[0095] The processing module is used to determine the number of times message msg4 will be repeatedly transmitted based on the first message mentioned above.

[0096] Fourthly, embodiments of this disclosure also provide a network device, including:

[0097] The transceiver module is used to send the first message, which is used by the terminal device to determine the number of times msg4 can be repeatedly transmitted based on the first message.

[0098] Fifthly, embodiments of this disclosure also provide a terminal device, including:

[0099] One or more processors;

[0100] The aforementioned terminal device is used to execute the method described in the first aspect and the optional implementation of the first aspect.

[0101] Sixthly, embodiments of this disclosure also provide a network device, including:

[0102] One or more processors;

[0103] The aforementioned network device is used to execute the method described in the second aspect and its optional implementation.

[0104] In a seventh aspect, embodiments of this disclosure also provide a communication system, including a network device and a terminal device; wherein the terminal device is configured to perform the method described in the first aspect and optional implementations of the first aspect, and the network device is configured to perform the method described in the second aspect and optional implementations of the second aspect.

[0105] Eighthly, embodiments of this disclosure also provide a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform the methods described in the first aspect, an optional implementation of the first aspect, the second aspect, and an optional implementation of the second aspect.

[0106] Ninthly, embodiments of this disclosure provide a program product that, when executed by a communication device, causes the communication device to perform the methods described in the first aspect, the optional implementation of the first aspect, the second aspect, and the optional implementation of the second aspect.

[0107] In a tenth aspect, embodiments of this disclosure provide a computer program that, when run on a computer, causes the computer to perform the methods described in the first aspect, an optional implementation of the first aspect, the second aspect, and an optional implementation of the second aspect.

[0108] Eleventhly, embodiments of this disclosure provide a chip or chip system. The chip or chip system includes processing circuitry configured to perform the methods described in the first aspect, optional implementations of the first aspect, the second aspect, and optional implementations of the second aspect.

[0109] It is understood that the aforementioned network devices, terminal devices, communication systems, storage media, program products, computer programs, chips, or chip systems are all used to execute the methods proposed in the embodiments of this disclosure. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods, and will not be repeated here.

[0110] In some embodiments, the terms communication method and signal transmission method, message transmission method, etc., can be used interchangeably; the terms communication method and signal reception method, message transmission method, etc., can be used interchangeably; and the terms communication system, information processing system, etc., can be used interchangeably.

[0111] This disclosure is not exhaustive, but merely illustrative of some embodiments, and is not intended to limit the scope of protection of this disclosure. Unless otherwise specified, each step in a particular embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a particular embodiment can also be implemented as an independent embodiment, and the order of the steps in a particular embodiment can be arbitrarily interchanged. Furthermore, the optional implementation methods in a particular embodiment can be arbitrarily combined; moreover, the embodiments can be arbitrarily combined, for example, some or all steps of different embodiments can be arbitrarily combined, and a particular embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0112] In each of the disclosed embodiments, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of the embodiments are consistent and can be referenced by each other. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0113] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure.

[0114] In the embodiments disclosed herein, "multiple" refers to two or more.

[0115] In some embodiments, the terms “at least one of A or B, at least one of A and B”, “one or more”, “a plurality of”, “multiple”, etc., may be used interchangeably.

[0116] In some embodiments, the notation "at least one of A and B", "A and / or B", "A in one case, B in another", "in response to one case A, in response to another case B", etc., may include the following technical solutions depending on the situation: in some embodiments, A (execute A regardless of whether there is a branch B); in some embodiments, B (execute B regardless of whether there is a branch A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, both A and B are executed. The same applies when there are more branches such as A, B, C, etc.

[0117] In some embodiments, the notation "A or B" may include the following technical solutions, depending on the situation: in some embodiments, A (execute A regardless of whether a branch B exists); in some embodiments, B (execute B regardless of whether a branch A exists); in some embodiments, execution is selected from A and B (A and B are selectively executed). The same applies when there are more branches such as A, B, and C.

[0118] The prefixes "first," "second," etc., used in the embodiments of this disclosure are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, quantity, or content of the descriptive objects. The description of the descriptive objects is found in the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is a "field," the ordinal numbers preceding "field" in "first field" and "second field" do not restrict the position or order of the "fields." "First" and "second" do not restrict whether the "fields" they modify are in the same message, nor do they restrict the order of "first field" and "second field." Similarly, if the descriptive object is a "level," the ordinal numbers preceding "level" in "first level" and "second level" do not restrict the priority between "levels." Furthermore, the number of descriptive objects is not limited by ordinal numbers and can be one or more. For example, in "first device," the number of "devices" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the object being described is "device", then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Similarly, if the object being described is "information", then "first information" and "second information" can be the same information or different information, and their content can be the same or different.

[0119] In some embodiments, “including A,” “containing A,” “for indicating A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0120] In some embodiments, terms such as "time / frequency" and "time-frequency domain" refer to the time domain and / or frequency domain.

[0121] In some embodiments, terms such as “in response to…”, “in response to determining…”, “in the case of…”, “when…”, “when…”, “if…”, etc. can be used interchangeably. These descriptions all refer to the device making a corresponding action under certain objective circumstances. They do not necessarily limit the time, nor do they require the device to make a judgment action when implementing it, nor do they mean that there must be other limitations.

[0122] In some embodiments, the terms “greater than,” “greater than or equal to,” “not less than,” “more than,” “more than or equal to,” “not less than,” “higher than,” “higher than or equal to,” “not lower than,” and “above” can be used interchangeably, as can the terms “less than,” “less than or equal to,” “not greater than,” “less than,” “less than or equal to,” “not more than,” “lower than,” “lower than or equal to,” “not higher than,” and “below”.

[0123] In some embodiments, devices, etc., may be interpreted as physical or virtual, and their names are not limited to those described in the embodiments. Terms such as “device,” “equipment,” “circuit,” “network element,” “network function,” “network device,” “function,” “node,” “unit,” “section,” “system,” “network,” “chip,” “chip system,” “entity,” and “subject” are interchangeable.

[0124] In some embodiments, "network" can be interpreted as devices included in a network (e.g., access network devices, core network devices, etc.).

[0125] In some embodiments, the acquisition of data, information, etc., may comply with the laws and regulations of the country where the location is situated.

[0126] In some embodiments, data, information, etc., may be obtained with the user's consent.

[0127] Furthermore, each element, each row, or each column in the table of this disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0128] As a crucial downlink channel in the Rel-19 NTN network, the channel CNR index for msg4 indicates that this channel needs to be repeated 2 to 4 times to meet the cell link budget requirements for hop beam coverage. The repetition count indication for msg4 scheduled by TC-RNTI scrambled DCI (e.g., DCI 0_1) needs to be determined.

[0129] Determining the number of repetitions requires comprehensive consideration of dynamic changes in CNR, cell coverage, and link budget to ensure stable signal transmission. Currently, the following consensus exists:

[0130] For Physical Downlink Shared Channel (PDSCH) that supports msg4 link-level enhancements:

[0131] Supports repeated PDSCH transmission;

[0132] Signaling design related to the number of repetitions;

[0133] The impact of repeated transmissions on the capabilities of terminal devices;

[0134] The target coverage enhancement needs to compensate for the gap in a single msg4 transmission, i.e., a gain of 2.8dB;

[0135] Focus on coverage enhancement set 1-3: for NR NTN downlink coverage enhancement (link level), with a target CNR (carrier-to-noise ratio) of -8dB.

[0136] Theoretically, two repetitions can achieve a 3dB gain, but some simulation results show that two repetitions cannot achieve the desired CNR difference. Furthermore, the repetition count indication needs to be performed in the DCI, which limits the flexibility of the re-decoding point and reduces the flexibility of the DCI. As a crucial part of NTN, the access process requires the terminal device to successfully decode the contention resolution message in the msg4 PDSCH to successfully complete the access process; therefore, a msg4 repetition mechanism is highly likely to be introduced.

[0137] Figure 1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure.

[0138] As shown in Figure 1, the communication system 100 includes network device 101 and terminal device 102.

[0139] During the random access process, network device 101 can send a first message to terminal device 102. Terminal device 102 determines the number of times message msg4 is repeatedly transmitted based on the first message, so as to realize the transmission of msg4 by the number of times msg4 is repeatedly transmitted.

[0140] In some embodiments, the terminal device includes, but is not limited to, at least one of the following: mobile phone, user equipment (UE) wearable device, Internet of Things device, car with sensing function, smart car, tablet computer, computer with wireless transceiver function, virtual reality (VR) terminal device, augmented reality (AR) terminal device, wireless terminal device in industrial control, wireless terminal device in self-driving, wireless terminal device in remote medical surgery, wireless terminal device in smart grid, wireless terminal device in transportation safety, wireless terminal device in smart city, and wireless terminal device in smart home, but is not limited to these.

[0141] In some embodiments, network device 101 may include at least one of access network device and core network device. For example, the network device may be a base station.

[0142] In some embodiments, the access network device is, for example, a node or device that connects a user equipment to a wireless network. The access network device may include at least one of the following in a 5G communication system: an evolved NodeB (eNB), a next-generation eNB (ng-eNB), a next-generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved node B (HeNB), a radio backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open RAN, a cloud RAN, a base station in other communication systems, and an access node in a Wi-Fi system, but is not limited thereto.

[0143] In some embodiments, the access network device may be composed of a central unit (CU) and a distributed unit (DU). The CU may also be called a control unit. The CU-DU structure can separate the protocol layer of the access network device. Some of the protocol layer functions are centrally controlled by the CU, while the remaining part or all of the protocol layer functions are distributed in the DU and centrally controlled by the CU. However, this is not the only possibility.

[0144] In some embodiments, a core network device may be a single device comprising one or more network elements, or it may be multiple devices or a group of devices, each comprising all or part of the aforementioned one or more network elements. Network elements may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), or a Next Generation Core (NGC).

[0145] It is understood that the communication system described in this disclosure is for the purpose of more clearly illustrating the technical solutions of this disclosure, and does not constitute a limitation on the technical solutions proposed in this disclosure. As those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions proposed in this disclosure are also applicable to similar technical problems.

[0146] The following embodiments of this disclosure can be applied to the communication system 100 shown in FIG1, or to some of the main bodies, but are not limited thereto. The main bodies shown in FIG1 are illustrative. The communication system may include all or some of the main bodies in FIG1, or may include other main bodies outside of FIG1. ​​The number and form of each main body are arbitrary. Each main body may be physical or virtual. The connection relationship between the main bodies is illustrative. The main bodies may not be connected or may be connected. The connection can be in any way, it can be a direct connection or an indirect connection, it can be a wired connection or a wireless connection.

[0147] The embodiments disclosed herein can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), and IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (a registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X) systems, Open Radio Access Network (O-RAN) systems, systems utilizing other resource determination methods, and next-generation systems extended from them, such as the 6th generation mobile communication system (6G). Furthermore, multiple systems can be combined (e.g., a combination of LTE or LTE-A with 5G).

[0148] Figure 2 is one of the interactive schematic diagrams of a communication method according to an embodiment of the present disclosure. As shown in Figure 2, the method includes:

[0149] S21, the network device sends the first message, which is used to indicate the number of times msg4 is repeatedly transmitted.

[0150] In this embodiment of the disclosure, the first message may be a first DCI used to schedule the transmission of msg4.

[0151] The first message is obtained by the network device through CRC scrambling based on the first TC-RNTI or the second TC-RNTI allocated to the terminal device. The second TC-RNTI is determined by the network device based on the number of repeated transmissions of the first TC-RNTI and msg4.

[0152] The number of times msg4 is repeatedly transmitted is also the number of times the Physical Downlink Shared Channel (PDSCH) carrying msg4 is transmitted.

[0153] In this embodiment of the disclosure, the network device may send a first DCI to the terminal device without assigning a Cell Radio Network Temporary Identifier (C-RNTI) to the terminal device.

[0154] When the terminal device is not assigned a C-RNTI, if it completes the transmission via PUSCH scheduled by RAR UL grant, the terminal device will attempt to detect the first DCI.

[0155] In this embodiment of the disclosure, the first DCI (first message) is used to schedule the transmission of msg4, that is, to schedule the transmission of the PDSCH carrying msg4.

[0156] In this embodiment of the disclosure, the network device may send a first DCI (first message) to the terminal device before sending msg4, for scheduling the transmission of msg4.

[0157] The format of the first DCI (first message) can be DCI1_0 (DCI format 1_0).

[0158] In this embodiment of the disclosure, before sending the first DCI (first message), the network device may perform Cyclic Redundancy Check (CRC) scrambling based on the first TC-RNTI or the second TC-RNTI, and then send the scrambled first DCI (first message).

[0159] In this embodiment of the disclosure, the first DCI (first message) may also indicate the number of times msg4 is repeatedly transmitted through at least one of the Modulation and Coding Scheme (MCS) domain or the Time Domain Resource Assignment domain.

[0160] Among them, network devices can determine the number of times msg4 is repeatedly transmitted based on the dynamic changes of the carrier-to-noise ratio (CNR), cell coverage, link budget, and channel state information (CSI) reported by terminal devices.

[0161] As an example, the first DCI (first message) indicates the number of times msg4 is repeatedly transmitted via at least one bit in the MCS field, or the first DCI (first message) indicates the number of times msg4 is repeatedly transmitted via at least one bit in the time-domain resource allocation field.

[0162] Specifically, the first DCI (first message) can identify different time-domain resource allocation methods through different combinations of identifier values ​​of each bit in the time-domain resource allocation field. Each time-domain resource allocation method includes the number of times msg4 is repeatedly transmitted.

[0163] For example, the first DCI (first message) can identify different time domain resource allocation methods in the Time Domain Resource Allocation (TDRA) table by different combinations of identifier values ​​for each bit in the time domain resource allocation field.

[0164] Optionally, the first DCI (first message) can identify different repeated transmission counts by different combinations of identifier values ​​of at least one reserved bit in the time-domain resource allocation field, that is, to identify the repeated transmission count corresponding to the last column of the time-domain resource allocation table separately.

[0165] In this embodiment of the disclosure, the time-domain resource allocation table is an existing time-domain resource allocation table with an additional column, which is used to identify the number of repeated transmissions.

[0166] As an example, the time domain resource allocation table can be as shown in Table 1, which is used to identify the default PDSCH time domain resource allocation A-r19 for normal CP.

[0167] Table 1:

[0168] Among them, Row index identifies the row identifier of the time-domain resource allocation table, DM-RS-TypeA-Position identifies the starting symbol position of the Demodulation Reference Signal (DM-RS) in the time slot, PDSCH mapping type identifies the mapping type of PDSCH (Type A is full time slot, Type B is partial time slot), K0 identifies the time slot offset of PDSCH relative to the Physical Downlink Control Channel (PDCCH), S identifies the starting symbol index of PDSCH in the time slot, L identifies the number of consecutive symbols occupied by PDSCH, and Rep identifies the number of times msg4 (PDSCH) is repeatedly transmitted.

[0169] In this embodiment of the disclosure, the number of times the first message indicates that msg4 has been repeatedly transmitted is within a first range of the number of times msg4 has been repeatedly transmitted as determined by the network device. The first range may include at least one of the following:

[0170] Repeat once or repeat twice;

[0171] Repeat once, repeat twice, or repeat four times;

[0172] Repeat once, repeat twice, repeat four times, or repeat eight times.

[0173] Optionally, the number of times msg4 is repeated can be any one or more of the following: repeat once, repeat twice, repeat four times, or repeat eight times, without any limitation.

[0174] Optionally, before sending the first message, the network device may also send a MIB and / or a SIB1 to indicate a first range of the number of retransmissions of msg4 via the MIB and / or via the SIB1.

[0175] The MIB includes first identification information, which indicates a first range of the number of times msg4 can be repeatedly transmitted.

[0176] Optionally, the first identification information may be at least one reserved bit in the SS / PBCH Block Subcarrier Offset (kssb) field.

[0177] As an example, the first identification information could be two reserved bits in the kssb field. That is, the MIB multiplexes the two reserved bits of the kssb field to indicate the first range of the number of times msg4 is retransmitted.

[0178] The MIB can indicate different ranges of repeated transmissions of msg4 by different combinations of identifier values ​​for the two reserved bits in the kssb field.

[0179] For example, the MIB indicates, through the first identification information, that the first range of the number of repeated transmissions of msg4 is 1 time or 2 times, or that the first range of the number of repeated transmissions is 1 time, 2 times or 4 times.

[0180] Optionally, the first identification information may be one or more reserved bits in the MIB, which indicate different ranges of the number of times msg4 is repeated through different combinations of identification values.

[0181] Optionally, the first identification information may be unused code points in the pdcch-configSIB1 field of the MIB. In other words, unused code points in the pdcch-configSIB1 field of the MIB, which contain the coreset 0 and searchspace 0 control messages, can be used as the first identification information to indicate a first range of repeated transmissions.

[0182] In this embodiment of the disclosure, the first range may also be a specific number of repeated transmissions.

[0183] For example, SIB1 can indicate the number of times msg4 is repeated, such as repeating 2 times or repeating 4 times.

[0184] In this embodiment of the disclosure, the first message may include MIB and SIB1.

[0185] In other words, the network device can first send a MIB, which indicates the first range of the number of times msg4 can be retransmitted, and then send an SIB1, which indicates the number of times msg4 can be retransmitted.

[0186] In this embodiment of the disclosure, when the first range of repeated transmissions of msg4 is indicated by SIB1, the network device may also indicate the same range in the control resource set 0 (CORESET0) for scheduling / controlling SIB1 sent to the terminal device.

[0187] S22, the terminal device determines the number of times msg4 will be retransmitted based on the first message.

[0188] In this embodiment of the disclosure, after receiving the first message, the terminal device can directly determine the number of times msg4 is repeatedly transmitted based on the first message.

[0189] In this embodiment of the disclosure, after the terminal device receives the first DCI (first message), it needs to perform CRC descrambling on the first DCI (first message) in order to receive msg4 based on the first DCI (first message) after CRC descrambling.

[0190] When the first DCI (first message) is obtained by scrambling with the first TC-RNTI, after receiving the first DCI (first message), the terminal device can perform CRC descrambling on the first DCI (first message) according to the first TC-RNTI, so as to receive msg4 according to the first DCI (first message) after CRC descrambling and the number of repeated transmissions of msg4 indicated by the first DCI (first message).

[0191] When the first DCI (first message) is scrambled by the second TC-RNTI, after receiving the first DCI (first message), the terminal device can perform CRC descrambling on the first DCI (first message) according to the second TC-RNTI, so as to receive msg4 according to the first DCI (first message) after CRC descrambling and the number of repeated transmissions of msg4 indicated by the first DCI (first message).

[0192] In this embodiment of the disclosure, the format of the second TC-RNTI includes at least one of the following: D+x; D*y+x;

[0193] Where D is the first TC-RNTI, and y is the preset coefficient.

[0194] Specifically, when the format of the second TC-RNTI includes D+x, x indicates that the number of repeated transmissions of msg4 is reduced by 1.

[0195] At this point, the second TC-RNTI is the sum of the number of repeated transmissions of the first TC-RNTI and msg4 minus 1.

[0196] When the format of the second TC-RNTI includes D*y+x, x indicates the number of times msg4 is repeatedly transmitted, and y is a preset coefficient used to avoid collisions and confusion with other TC-RNTIs, ensuring that the second TC-RNTI has an independent identifier.

[0197] At this point, the second TC-RNTI is the product of the first TC-RNTI and the preset coefficient, plus the number of repeated transmissions of msg4.

[0198] Based on this, after receiving the first TC-RNTI allocated to it by the network device, the terminal device can determine the second TC-RNTI according to the first TC-RNTI and the number of repeated transmissions of msg4 indicated by the first message. After determining the number of repeated transmissions of msg4, the network device can determine the second TC-RNTI according to the first TC-RNTI and the determined number of repeated transmissions of msg4.

[0199] For example, the second TC-RNTI can be determined according to the format D+x, that is, the second TC-RNTI is the sum of the first TC-RNTI and the number of repeated transmissions of msg4 minus 1. Alternatively, the second TC-RNTI can be determined according to the format D*y+x, that is, the second TC-RNTI is the product of the first TC-RNTI and a preset coefficient plus the number of repeated transmissions of msg4.

[0200] Based on this, the terminal device can receive msg4 according to the first DCI (first message) after CRC descrambling using the second TC-RNTI, that is, receive msg4 according to the scheduling information of the first DCI (first message).

[0201] In this embodiment of the disclosure, before receiving the first DCI (first message), the terminal device may also receive a second message sent by the network device. The second message includes a first temporary cell radio network temporary identifier (TC-RNTI) allocated by the network device.

[0202] In this embodiment of the disclosure, after receiving msg1 sent by the terminal device during the random access process, the network device sends a second message to the terminal device.

[0203] msg1 is used to send the random access preamble.

[0204] The second message could be msg2, which is the Random Access Response.

[0205] The second message includes the first TC-RNTI assigned to the network device.

[0206] In this embodiment of the disclosure, msg4 is a contention resolution message sent by the network device via PDSCH, including the UE contention resolution identifier.

[0207] Furthermore, the terminal device sends msg3 (contention resolution request) to the network device based on the uplink grant (UL grant) in the second message. After receiving msg3, the network device sends msg4 according to the number of repeated transmissions.

[0208] In this embodiment of the disclosure, when the terminal device detects a DCI format transmission for a PUSCH scheduled by RAR uplink grant, or detects a PUSCH retransmission scheduled by DCI 0_0 scrambled by TC-RNTI in the corresponding RAR message, regardless of whether the terminal device is configured with a Transmission Configuration Indication State (TCI-State) for receiving the CORESET of the DCI format, the DM-RS antenna port quasi-co-location (QCL) characteristic of the PDCCH carrying the DCI format is the same as the QCL characteristic of the SS / PBCH block associated by the terminal device for the Physical Random Access Channel (PRACH).

[0209] In this embodiment of the disclosure, if the terminal device successfully receives msg4, that is, after successfully receiving the PDSCH carrying the contention resolution identifier, it can send a Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) message through the Physical Uplink Control Channel (PUCCH) to report to the network device that msg4 has been correctly received.

[0210] Optionally, the PUCCH transmission of the terminal device must be within the same active uplink bandwidth portion as the received PUSCH transmission carrying msg4.

[0211] Optionally, the minimum time interval between the last symbol of the PDSCH carrying msg4 received by the terminal device and the first symbol of the PUCCH carrying HARQ-ACK information is N. T,1 +0.5 milliseconds.

[0212] Where, N T,1 The time N is the time it takes for the terminal device to process the PDSCH carrying msg4 based on processing capacity 1. T,1 The duration is N1 symbols.

[0213] When the network device is configured with an additional DM-RS, N1 is 14; when no additional DM-RS is configured, 1N1 can be 14.

[0214] The duration of each symbol is related to the subcarrier spacing μ. For example, when μ = 0, the subcarrier spacing is 15 kHz and the symbol duration is approximately 66.7 μs. When μ = 1, the subcarrier spacing is 30 kHz and the symbol duration is approximately 33.3 μs.

[0215] The communication method involved in the embodiments of this disclosure may include the foregoing steps and at least one of the embodiments. For example, any step in S21-S23 may be implemented as an independent embodiment, and any combination of any number of steps in S21-S23 may be implemented as an independent embodiment, but is not limited thereto.

[0216] Figure 3 is a second interactive schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in Figure 3, the above method includes:

[0217] S31, the network device sends a first message to indicate the first range of repeated transmissions of msg4.

[0218] In this embodiment of the disclosure, during or before the random access process, the network device may send a first message indicating a first range of the number of times msg4 can be repeatedly transmitted.

[0219] In this embodiment of the disclosure, the first message may include a Master Information Block (MIB). The network device may broadcast the MIB through the Physical Broadcast Channel (PBCH) to indicate a first range of the number of times msg4 may be retransmitted.

[0220] In this embodiment of the disclosure, the first message may include System Information Block 1 (SIB1). The network device can send SIB1 to the terminal device through PDSCH, and the SIB1 indicates a first range of repeated transmissions of msg4.

[0221] In this embodiment of the disclosure, the first range of the number of repeated transmissions of msg4 may include at least one of the following:

[0222] Repeat once or repeat twice;

[0223] Repeat once, repeat twice, or repeat four times;

[0224] Repeat once, repeat twice, repeat four times, or repeat eight times.

[0225] Optionally, the number of times msg4 is repeated can be any one or more of the following: repeat once, repeat twice, repeat four times, or repeat eight times, without any limitation.

[0226] In this embodiment of the disclosure, when the first message includes a MIB, the MIB includes first identification information that indicates a first range of repeated transmissions of msg4.

[0227] Optionally, the first identification information may be at least one reserved bit in the SS / PBCH Block Subcarrier Offset (kssb) field.

[0228] As an example, the first identification information could be two reserved bits in the kssb field. That is, the MIB multiplexes the two reserved bits of the kssb field to indicate the first range of the number of times msg4 is retransmitted.

[0229] The MIB can indicate different ranges of repeated transmissions of msg4 by different combinations of identifier values ​​for the two reserved bits in the kssb field.

[0230] For example, the MIB indicates, through the first identification information, that the first range of the number of repeated transmissions of msg4 is 1 time or 2 times, or that the first range of the number of repeated transmissions is 1 time, 2 times or 4 times.

[0231] Optionally, the first identification information may be one or more reserved bits in the MIB, which indicate different ranges of the number of times msg4 is repeated through different combinations of identification values.

[0232] Optionally, the first identification information may be unused code points in the pdcch-configSIB1 field of the MIB. In other words, unused code points in the pdcch-configSIB1 field of the MIB, which contain the coreset 0 and searchspace 0 control messages, can be used as the first identification information to indicate a first range of repeated transmissions.

[0233] In this embodiment of the disclosure, the first range of the number of repeated transmissions of msg4 indicated by the first message can also be a specific number of repeated transmissions.

[0234] For example, if the first message includes SIB1, SIB1 can indicate the number of times msg4 is repeated, such as repeating 2 times or repeating 4 times.

[0235] In this embodiment of the disclosure, the first message may include MIB and SIB1.

[0236] In other words, the network device can first send a MIB, which indicates the first range of the number of times msg4 can be retransmitted, and then send an SIB1, which indicates the number of times msg4 can be retransmitted.

[0237] In this embodiment of the disclosure, when the first range of repeated transmissions of msg4 is indicated by SIB1, the network device may also indicate the same range in the control resource set 0 (CORESET0) for scheduling / controlling SIB1 sent to the terminal device.

[0238] S32, the terminal device receives the first DCI, which is obtained by the network device through CRC scrambling based on the second TC-RNTI. The second TC-RNTI is determined by the network device based on the number of repeated transmissions of the first TC-RNTI and msg4 allocated to the terminal device.

[0239] In this embodiment of the disclosure, the network device may send a first DCI to the terminal device without assigning a C-RNTI to the terminal device.

[0240] When the terminal device is not assigned a C-RNTI, if it completes the transmission via PUSCH scheduled by RAR UL grant, the terminal device will attempt to detect the first DCI.

[0241] In this embodiment of the disclosure, the first DCI is used to schedule the transmission of msg4, that is, to schedule the transmission of the PDSCH carrying msg4.

[0242] In this embodiment of the disclosure, the network device may send a first DCI to the terminal device before sending msg4, for scheduling the transmission of msg4.

[0243] The format of the first DCI can be DCI1_0 (DCI format 1_0).

[0244] In this embodiment of the disclosure, the network device can perform CRC scrambling on the first DCI through the second TC-RNTI, and the second TC-RNTI is determined based on the first TC-RNTI allocated to the terminal device and the determined number of repeated transmissions of msg4.

[0245] Among them, network devices can determine the number of times msg4 is repeatedly transmitted based on the dynamic changes of the carrier-to-noise ratio (CNR), cell coverage, link budget, and channel state information (CSI) reported by terminal devices.

[0246] In this embodiment of the disclosure, the format of the second TC-RNTI includes at least one of the following:

[0247] D+x;

[0248] D*y+x;

[0249] Where D is the first TC-RNTI and y is the preset coefficient.

[0250] Specifically, when the format of the second TC-RNTI includes D+x, x indicates that the number of repeated transmissions of msg4 is reduced by 1.

[0251] At this point, the second TC-RNTI is the sum of the number of repeated transmissions of the first TC-RNTI and msg4 minus 1.

[0252] When the format of the second TC-RNTI includes D*y+x, x indicates the number of times msg4 is repeatedly transmitted, and y is a preset coefficient used to avoid collisions and confusion with other TC-RNTIs, ensuring that the second TC-RNTI has an independent identifier.

[0253] At this point, the second TC-RNTI is the product of the first TC-RNTI and the preset coefficient, plus the number of repeated transmissions of msg4.

[0254] Based on this, the network device can determine the second TC-RNTI according to the number of repeated transmissions of the first TC-RNTI and msg4.

[0255] For example, the second TC-RNTI can be determined according to the format D+x, that is, the second TC-RNTI is the sum of the first TC-RNTI and the number of repeated transmissions of msg4 minus 1. Alternatively, the second TC-RNTI can be determined according to the format D*y+x, that is, the second TC-RNTI is the product of the first TC-RNTI and a preset coefficient plus the number of repeated transmissions of msg4.

[0256] S33, the terminal device determines the number of repeated transmissions of msg4 within a first range based on the first TC-RNTI and the first DCI.

[0257] In this embodiment of the disclosure, when the first DCI is scrambled by the second TC-RNTI, the terminal device can determine the number of repeated transmissions of msg4 within a first range based on the first TC-RNTI and the first DCI.

[0258] Before sending the first DCI, the network device may also send a second message to the terminal device. The second message includes the first TC-RNTI assigned by the network device. The terminal device can then obtain the first TC-RNTI based on the second message.

[0259] In this embodiment of the disclosure, the terminal device, within a first range of the number of repeated transmissions of msg4 indicated by the first message, sequentially constructs a new TC-RNTI with each repeated transmission count and the first TC-RNTI in ascending order of the number of repeated transmissions, and performs CRC descrambling on the first DCI based on the constructed new TC-RNTI until the CRC descrambling of the first DCI is successfully completed. The new TC-RNTI when the CRC descrambling is successfully completed is determined as the second TC-RNTI, and the number of repeated transmissions used to construct the second TC-RNTI is determined as the actual number of repeated transmissions of msg4.

[0260] For each attempt at repeated transmission, the terminal device can determine a new TC-RNTI based on the number of repeated transmissions and the first TC-RNTI. For example, the new TC-RNTI can be determined according to the format D+x, that is, the new TC-RNTI is the sum of the first TC-RNTI and the number of repeated transmissions in this attempt minus 1, where x is the number of repeated transmissions in this attempt minus 1.

[0261] Alternatively, the new TC-RNTI can be determined according to the format D*y+x, that is, the new TC-RNTI is the product of the first TC-RNTI and the preset coefficient plus the number of repeated transmissions this time. In this case, x is the number of repeated transmissions this time, and y is the preset coefficient.

[0262] Based on this, the terminal device can receive msg4 according to the first DCI after CRC descrambling using the second TC-RNTI and the determined number of repeated transmissions of msg4.

[0263] After successfully performing CRC descrambling on the first DCI, the terminal device can determine the number of times msg4 is repeatedly transmitted. When receiving msg4, the terminal device can receive msg4 based on the number of times msg4 is repeatedly transmitted.

[0264] In this embodiment of the disclosure, msg4 is a contention resolution message sent by the network device via PDSCH, including the UE contention resolution identifier.

[0265] Furthermore, the terminal device sends msg3 (contention resolution request) to the network device based on the uplink grant (UL grant) in the second message. After receiving msg3, the network device sends msg4 according to the number of repeated transmissions.

[0266] In this embodiment of the disclosure, when the terminal device detects a DCI format transmission for a PUSCH scheduled by RAR uplink grant, or detects a PUSCH retransmission scheduled by DCI 0_0 scrambled by TC-RNTI in the corresponding RAR message, regardless of whether the terminal device is configured with a TCI-State for receiving the CORESET of the DCI format, the QCL characteristics of the DM-RS antenna port carrying the PDCCH of the DCI format are the same as the QCL characteristics of the SS / PBCH block associated by the terminal device for PRACH.

[0267] In this embodiment of the disclosure, if the terminal device successfully receives msg4, that is, successfully receives the PDSCH carrying the contention resolution identifier, it can send a HARQ-ACK message through PUCCH to report to the network device that msg4 has been correctly received.

[0268] Optionally, the PUCCH transmission of the terminal device must be within the same active uplink bandwidth portion as the received PUSCH transmission carrying msg4.

[0269] Optionally, the minimum time interval between the last symbol of the PDSCH carrying msg4 received by the terminal device and the first symbol of the PUCCH carrying HARQ-ACK information is N. T,1 +0.5 milliseconds.

[0270] Where, N T,1 The time N is the time it takes for the terminal device to process the PDSCH carrying msg4 based on processing capacity 1. T,1 The duration is N1 symbols.

[0271] When the network device is configured with an additional DM-RS, N1 is 14; when no additional DM-RS is configured, N1 can be 14.

[0272] The duration of each symbol is related to the subcarrier spacing μ. For example, when μ = 0, the subcarrier spacing is 15 kHz and the symbol duration is approximately 66.7 μs. When μ = 1, the subcarrier spacing is 30 kHz and the symbol duration is approximately 33.3 μs.

[0273] By combining the first range of repeated transmission counts indicated by MIB or SIB1 messages with the DCI indication of repeated transmission counts, a more flexible repeat mechanism configuration can be achieved, reducing the dependence on DCI code points and maintaining the flexibility of the indication.

[0274] The communication method involved in the embodiments of this disclosure may include the foregoing steps and at least one of the embodiments. For example, any step in S31-S33 may be implemented as an independent embodiment, and any combination of any number of steps in S31-S33 may be implemented as an independent embodiment, but is not limited thereto.

[0275] The communication method provided in this disclosure will be further explained below with specific examples.

[0276] Example 1:

[0277] For cases where msg4 needs to be transmitted repeatedly, the scrambling RNTI changes from TC-RNTI to TC-x-RNTI.

[0278] Where TC-x-RNTI=TC_RNTI+x, x is the number of repetitions minus 1. For example, if it is repeated 2 times, TC-x-RNTI=TC_RNTI+1.

[0279] At this point, the UE needs to parse the PDCCH according to the new TC-x-RNTI to ensure that the repeatedly transmitted signals are correctly received and processed, and to avoid misjudgment.

[0280] Alternatively, TC-x-RNTI = TC_RNTI * y + x, where x is the number of repetitions and y is a preset coefficient used to indicate the number of times the PDSCH carrying msg4 is retransmitted. y is used to avoid collisions between TC_RNTIs and confusion with other RNTIs, ensuring a unique identifier for each retransmission.

[0281] Example 2:

[0282] The first range of possible repeated transmissions is indicated by the MIB and SIB bits.

[0283] The MIB indicates the repetition count in the range of {1,2} or {1,4}, and reuses the reserved 2 bits of kssb or the spare 1 bit in the MIB.

[0284] SIB1 can specify the number of repeated transmissions, such as 2 or 4, to ensure that the UE accurately receives and decodes the repeated signals.

[0285] In SIB1, the range of repetitions is {1,2} or {1,4}, and the specific number of repetitions is indicated by DCI.

[0286] You can use the method in Example 1, or you can use the MCS field or time-domain resource allocation field indication in DCI 1_0, or add a column to the TDRA table (as mentioned in Table 1 above).

[0287] The number of repetitions or the repetition range indicated by the aforementioned MIB can be used for repetitions of SIB1 and Coreset0.

[0288] For Example 1 and Example 2:

[0289] When a UE responds to a PUSCH transmission scheduled by a RAR UL grant without having been allocated a C-RNTI, the UE will attempt to detect a DCI format 1_0 scrambled by a corresponding TC-RNTI, which schedules a PDSCH that carries a UE contention resolution identity.

[0290] After successfully receiving the PDSCH containing the UE contention resolution identity, the UE transmits HARQ-ACK information in a PUCCH.

[0291] The PUCCH transmission is located within the same active uplink bandwidth (Active UL BWP) as the PUSCH transmission.

[0292] The minimum time interval between the last symbol received from the PDSCH and the first symbol transmitted via the PUCCH carrying HARQ-ACK is N. T,1 +0.5ms(A minimum time between the last symbol of the PDSCH reception and the first symbol of the corresponding PUCCH transmission with the HARQ-ACK information is equal to N T,1 +0.5msec).

[0293] Where, N T,1 The PDSCH processing time corresponding to UE Processing Capability 1, when an additional PDSCH DM-RS is configured, is equal to the duration of N1 symbols (N... T,1 is a time duration of N1symbols corresponding to a PDSCH processing time for UE processing capability 1when additional PDSCH DM-RS is configured).

[0294] For the subcarrier spacing configuration μ = 0 (SCS = 15kHz), the UE assumes N 1,0 =14(Forμ=0,the UE assumes N 1,0 =14).

[0295] When a UE detects a DCI format in response to a PUSCH transmission scheduled by a RAR uplink grant, or a corresponding PUSCH retransmission scheduled by a DCI format 0_0 with CRC scrambled by a TC-RNTI provided in the corresponding RAR message, regardless of whether the terminal device is configured with a CORESET TCI-State for receiving the DCI format, the DM-RS antenna port QCL characteristics of the PDCCH carrying the DCI format are the same as the QCL characteristics of the SS / PBCH block used by the terminal device for PRACH association. of whether or not the UE is provided TCI-State for the CORESET where the UE receives the PDCCH with the DCI format).

[0296] Figure 4 is a schematic flowchart illustrating one of the communication methods according to an embodiment of the present disclosure. The communication method shown in Figure 4 is executed by a terminal device and includes:

[0297] S41, Receive first message.

[0298] In this embodiment of the disclosure, the first message is used to indicate a first range of the number of times msg4 is repeatedly transmitted or the number of times msg4 is repeatedly transmitted.

[0299] In this embodiment of the disclosure, in response to a first message used to indicate a first range, the first message includes at least one of a main information block (MIB) or a system information block (SIB1).

[0300] In this embodiment of the disclosure, the MIB indicates a first range through first identification information, which includes at least one of the following:

[0301] At least one bit in the kssb field;

[0302] Reserved bits of the MIB;

[0303] Unused code points in the pdcch-configSIB1 field.

[0304] In this embodiment of the disclosure, in response to a first message indicating a first range, the method further includes:

[0305] Receive the first downlink control information (DCI), which is used to schedule the transmission of msg4;

[0306] The first DCI is obtained by the network device through cyclic redundancy check (CRC) scrambling based on the temporary identifier of the second temporary cell radio network (TC-RNTI). The second TC-RNTI is determined by the network device based on the number of repeated transmissions of the first TC-RNTI and msg4 allocated to the terminal device.

[0307] In this disclosure embodiment, the first scope includes at least one of the following:

[0308] Repeat once or repeat twice;

[0309] Repeat once, repeat twice, or repeat four times;

[0310] Repeat once, repeat twice, repeat four times, or repeat eight times.

[0311] In this embodiment of the disclosure, in response to the first message used to indicate the number of repeated transmissions of msg4, the first message is a first DCI used to schedule the transmission of msg4. The first message is obtained by the network device through CRC scrambling based on the first TC-RNTI or the second TC-RNTI allocated to the terminal device. The second TC-RNTI is determined by the network device based on the first TC-RNTI and the number of repeated transmissions of msg4.

[0312] In this embodiment of the disclosure, the format of the second TC-RNTI includes at least one of the following: D+x; D*y+x;

[0313] Where D is the first TC-RNTI, and y is the preset coefficient;

[0314] The format of the response to the second TC-RNTI includes D+x, where x indicates the number of repeated transmissions of msg4 minus 1; the format of the response to the second TC-RNTI includes D*y+x, where x indicates the number of repeated transmissions of msg4.

[0315] In this embodiment of the disclosure, the first message indicates the number of times msg4 is repeatedly transmitted through at least one of the modulation and coding scheme domain or the time domain resource allocation domain;

[0316] The number of times msg4 is repeatedly transmitted as indicated by the first message is within the first range of the number of times msg4 is repeatedly transmitted as determined by the network device.

[0317] In this embodiment of the disclosure, the format of the first DCI is DCI1_0.

[0318] S42, determine the number of times msg4 will be retransmitted based on the first message.

[0319] In this embodiment of the disclosure, in response to the first message indicating the number of times msg4 is repeatedly transmitted, the terminal device can directly determine the number of times message msg4 is repeatedly transmitted based on the first message;

[0320] In response to a first range indicating the number of times msg4 can be retransmitted in the first message, determining the number of times message msg4 can be retransmitted based on the first message includes:

[0321] The number of repeated transmissions of msg4 is determined within the first range based on the first TC-RNTI and the first DCI.

[0322] Figure 5 is a second schematic flowchart illustrating a communication method according to an embodiment of the present disclosure. The communication method shown in Figure 5 is executed by a network device and includes:

[0323] S51, send the first message, which is used by the terminal device to determine the number of times msg4 can be retransmitted.

[0324] In this embodiment of the disclosure, the first message is used to indicate a first range of the number of times msg4 is repeatedly transmitted or the number of times msg4 is repeatedly transmitted.

[0325] In this embodiment of the disclosure, in response to a first message used to indicate a first range, the first message includes at least one of MIB or SIB1.

[0326] In this embodiment of the disclosure, the MIB indicates a first range through first identification information, which includes at least one of the following:

[0327] At least one bit in the kssb field;

[0328] Reserved bits of the MIB;

[0329] Unused code points in the pdcch-configSIB1 field.

[0330] In this embodiment of the disclosure, in response to a first message indicating a first range, the method further includes:

[0331] Send the first DCI, which is used by the terminal device to determine the number of times msg4 is repeatedly transmitted within a first range based on the first TC-RNTI and the first DCI allocated by the network device.

[0332] The first DCI is used to schedule the transmission of msg4. The first DCI is obtained by the network device through CRC scrambling based on the second TC-RNTI. The second TC-RNTI is determined by the network device based on the first TC-RNTI allocated to the terminal device and the number of repeated transmissions of msg4.

[0333] In this disclosure embodiment, the first scope includes at least one of the following:

[0334] Repeat once or repeat twice;

[0335] Repeat once, repeat twice, or repeat four times;

[0336] Repeat once, repeat twice, repeat four times, or repeat eight times.

[0337] In this embodiment of the disclosure, in response to the first message used to indicate the number of repeated transmissions of msg4, the first message is a first DCI used to schedule the transmission of msg4. The first message is obtained by the network device through CRC scrambling based on the first TC-RNTI or the second TC-RNTI allocated to the terminal device. The second TC-RNTI is determined by the network device based on the first TC-RNTI and the number of repeated transmissions of msg4.

[0338] In this embodiment of the disclosure, the format of the second TC-RNTI includes at least one of the following: D+x; D*y+x;

[0339] Where D is the first TC-RNTI, and y is the preset coefficient;

[0340] The format of the response to the second TC-RNTI includes D+x, where x indicates the number of repeated transmissions of msg4 minus 1; the format of the response to the second TC-RNTI includes D*y+x, where x indicates the number of repeated transmissions of msg4.

[0341] In this embodiment of the disclosure, the first message indicates the number of times msg4 is repeatedly transmitted through at least one of the modulation and coding scheme domain or the time domain resource allocation domain;

[0342] The number of times msg4 is repeatedly transmitted as indicated by the first message is within the first range of the number of times msg4 is repeatedly transmitted as determined by the network device.

[0343] In this embodiment of the disclosure, the format of the first DCI is DCI1_0.

[0344] In some embodiments, the names of information, etc., are not limited to the names described in the embodiments. Terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0345] In some embodiments, terms such as “moment,” “point in time,” “time,” and “time location” can be used interchangeably, as can terms such as “duration,” “segment,” “time window,” “window,” and “time.”

[0346] In some embodiments, terms such as wireless access scheme and waveform can be used interchangeably.

[0347] In some embodiments, terms such as "certain," "preset," "default," "set," "indicated," "a certain," "any," and "first" can be used interchangeably. "Certain A," "preset A," "default A," "set A," "indicated A," "a certain A," "any A," and "first A" can be interpreted as A pre-defined in a protocol or the like, or as A obtained through setting, configuration, or instruction, or as specific A, a certain A, any A, or first A, but are not limited thereto.

[0348] In some embodiments, the determination or judgment can be made by a value represented by 1 bit (0 or 1), or by a true or false value (boolean), or by a comparison of numerical values ​​(e.g., a comparison with a predetermined value), but is not limited thereto.

[0349] In some embodiments, the steps and their optional implementations in other embodiments described before or after this embodiment, as well as other related parts in the specification, can be referred to, and will not be repeated here.

[0350] Figure 6 is a schematic diagram of the structure of a terminal device according to an embodiment of this disclosure. The terminal device is used to perform any of the above methods. In some embodiments, as shown in Figure 6, the terminal device 600 may include a transceiver module 601 and a processing module 602.

[0351] In some embodiments, the transceiver module 601 is configured to receive a first message; the processing module 602 is configured to determine the number of times message msg4 will be repeatedly transmitted based on the first message.

[0352] Optionally, the transceiver module 601 is used to perform at least one of the transceiver steps (e.g., S32, S41, but not limited thereto) performed by the terminal device in any of the above methods, which will not be elaborated here.

[0353] Optionally, the processing module 602 is used to execute the processing steps (e.g., S22, S33, S42, but not limited thereto) executed by the terminal device in any of the above methods.

[0354] In some embodiments, the transceiver module can be interchanged with the transceiver, the sending module, and the receiving module.

[0355] Figure 7 is a schematic diagram of the structure of a network device according to an embodiment of this disclosure. The network device is used to perform any of the above methods. In some embodiments, as shown in Figure 7, the network device 700 may include a transceiver module 701.

[0356] In some embodiments, the transceiver module 701 is configured to send a first message, which is used by the terminal device to determine the number of times msg4 can be repeatedly transmitted based on the first message.

[0357] Optionally, the transceiver module 701 is used to perform at least one of the transceiver steps (e.g., S21, S31, S51, but not limited thereto) performed by the network device in any of the above methods, which will not be described in detail here.

[0358] In some embodiments, the processing module can be interchanged with the processor and the determination module, and the transceiver module can be interchanged with the transceiver, the sending module, and the receiving module.

[0359] It should be understood that the division of units or modules in the above device is only a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, the units or modules in the device can be implemented by a processor calling software: for example, the device includes a processor connected to a memory containing instructions. The processor calls the instructions stored in the memory to implement any of the above methods or to implement the functions of the units or modules in the above device. The processor can be, for example, a general-purpose processor, such as a Central Processing Unit (CPU) or a microprocessor, and the memory can be internal or external to the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits. The functionality of some or all of the units or modules can be achieved through the design of these hardware circuits, which can be understood as one or more processors. For example, in one implementation, the hardware circuit is an application-specific integrated circuit (ASIC). The functionality of some or all of the units or modules is achieved through the design of the logical relationships between the components within the circuit. In another implementation, the hardware circuit can be implemented using a programmable logic device (PLD). Taking a field-programmable gate array (FPGA) as an example, it can include a large number of logic gates. The connection relationships between the logic gates are configured through configuration files, thereby achieving the functionality of some or all of the units or modules. All units or modules of the above device can be implemented entirely through processor-called software, entirely through hardware circuits, or partially through processor-called software with the remaining parts implemented through hardware circuits.

[0360] Figure 8 is a schematic diagram of the structure of the communication device 800 proposed in an embodiment of this disclosure. The communication device 800 can be a network device (e.g., access network device, core network device, etc.), a terminal device (e.g., user equipment, etc.), a chip, chip system, or processor that supports the network device in implementing any of the above methods, or a chip, chip system, or processor that supports the terminal in implementing any of the above methods. The communication device 800 can be used to implement the methods described in the above method embodiments; for details, please refer to the descriptions in the above method embodiments.

[0361] As shown in Figure 8, the communication device 800 is used to execute any of the above methods. In some embodiments, the communication device 800 includes one or more processors 801. The processor 801 may be a general-purpose processor or a special-purpose processor, such as a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data, and the central processing unit may be used to control communication devices (e.g., base stations, baseband chips, terminal devices, terminal device chips, DUs or CUs, etc.), execute programs, and process program data. Optionally, the communication device 800 is used to execute any of the above methods. Optionally, one or more processors 801 are used to invoke instructions to cause the communication device 800 to execute any of the above methods.

[0362] In some embodiments, the communication device 800 further includes one or more transceivers 802. When the communication device 800 includes one or more transceivers 802, the transceiver 802 performs at least one of the transmission and / or reception steps in the above method (e.g., S21, S31-S32, S51, S42, but not limited thereto), and the processor 801 performs at least one of the processing steps in the above method (e.g., S22, S33, S41, but not limited thereto). In optional embodiments, the transceiver may include a receiver and / or a transmitter, which may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, interface, etc., can be used interchangeably; the terms transmitter, transmitting unit, transmitter, transmitting circuit, etc., can be used interchangeably; the terms receiver, receiving unit, receiver, receiving circuit, etc., can be used interchangeably.

[0363] In some embodiments, the communication device 800 further includes one or more memories 803 for storing data and / or instructions. Optionally, one or more processors 801 are used to invoke instructions stored in the memory 803 to cause the communication device 800 to perform any of the above methods. Optionally, all or part of the memory 803 may also be located outside the communication device 800. In an optional embodiment, the communication device 800 may include one or more interface circuits 804. Optionally, the interface circuit 804 is connected to the memory 802, and the interface circuit 804 can be used to receive data and / or instructions from the memory 802 or other devices, and can be used to send data and / or instructions to the memory 802 or other devices. For example, the interface circuit 804 can read data and / or instructions stored in the memory 802 and send the data and / or instructions to the processor 801.

[0364] The communication device 800 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 800 described in this disclosure is not limited thereto, and the structure of the communication device 800 may not be limited by FIG8. The communication device may be a standalone device or may be part of a larger device. For example, the communication device may be: (1) a standalone integrated circuit IC, or chip, or chip system or subsystem; (2) a collection of one or more ICs, optionally, the IC collection may also include storage components for storing data, programs and / or instructions; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, terminal device, smart terminal device, cellular phone, wireless device, handheld device, mobile unit, vehicle device, network device, cloud device, artificial intelligence device, etc.; (6) others, etc.

[0365] Figure 9 is a schematic diagram of the structure of the chip 900 proposed in an embodiment of this disclosure. For cases where the communication device 800 can be a chip or a chip system, please refer to the schematic diagram of the chip 900 shown in Figure 9, but it is not limited thereto.

[0366] Chip 900 includes one or more processors 901. Chip 900 is used to perform any of the above methods.

[0367] In some embodiments, chip 900 further includes one or more interface circuits 902. Optionally, terms such as interface circuit, interface, and transceiver pin can be used interchangeably. In some embodiments, chip 900 further includes one or more memories 903 for storing data and / or instructions. Optionally, all or part of the memories 903 may be located outside chip 900. Optionally, interface circuit 902 is connected to memory 903, and interface circuit 902 can be used to receive data and / or instructions from memory 903 or other devices, and interface circuit 902 can be used to send data and / or instructions to memory 903 or other devices. For example, interface circuit 902 can read data and / or instructions stored in memory 903 and send the data and / or instructions to processor 901.

[0368] In some embodiments, the interface circuit 902 performs at least one of the transmit and / or receive steps in the above-described method (e.g., S21, S31-S32, S51, S42, but not limited thereto). The interface circuit 902 performing the transmit and / or receive steps in the above-described method refers, for example, to the interface circuit 902 performing data and / or instruction interaction between the processor 901, the chip 900, the memory 903, or the transceiver device. In some embodiments, the processor 901 performs at least one of the processing steps in the above-described method (e.g., S22, S33, S41, but not limited thereto).

[0369] The modules and / or devices described in the various embodiments, such as virtual devices, physical devices, and chips, can be combined or separated arbitrarily as needed. Optionally, some or all steps can also be performed collaboratively by multiple modules and / or devices, which is not limited here.

[0370] In this embodiment, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction read and execute capabilities, such as a Central Processing Unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationships of hardware circuits. The logical relationships of the aforementioned hardware circuits are fixed or reconfigurable. For example, the processor is a hardware circuit implemented using an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and configuring the hardware circuit can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. Furthermore, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a Neural Network Processing Unit (NPU), a Tensor Processing Unit (TPU), or a Deep Learning Processing Unit (DPU).

[0371] This disclosure also proposes a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but not limited thereto; it may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but not limited thereto; it may also be a temporary storage medium.

[0372] This disclosure also proposes a program product, including a program and / or instructions, which, when executed by a communication device, cause the communication device to perform any of the above methods. Optionally, the program product is a computer program product. Optionally, the program product is stored on the storage medium.

[0373] This disclosure also proposes a computer program that, when run on a computer, causes the computer to perform any of the above methods.

Claims

1. A communication method, characterized in that, Applied to a terminal device, the method includes: Receive the first message; The number of times message msg4 is retransmitted is determined based on the first message.

2. The method according to claim 1, characterized in that, The first message is used to indicate a first range of the number of times msg4 is repeatedly transmitted or the number of times msg4 is repeatedly transmitted.

3. The method according to claim 2, characterized in that, In response to the first message used to indicate the first range, the first message includes at least one of the main information block MIB or system information block 1SIB1.

4. The method according to claim 3, characterized in that, The MIB indicates the first range through first identification information, which includes at least one of the following: At least one bit in the kssb field; The reserved bits of the MIB; Unused code points in the pdcch-configSIB1 field.

5. The method according to any one of claims 2, characterized in that, In response to the first message indicating the first range, the method further includes: Receive first downlink control information (DCI), the first DCI being used to schedule the transmission of msg4; Wherein, the first DCI is obtained by the network device through cyclic redundancy check (CRC) scrambling based on the second temporary cell radio network temporary identifier (TC-RNTI), and the second TC-RNTI is determined by the network device based on the first TC-RNTI allocated to the terminal device and the number of repeated transmissions of msg4; Determining the number of times message msg4 is repeatedly transmitted based on the first message includes: Based on the first TC-RNTI and the first DCI, the number of repeated transmissions of msg4 is determined within the first range.

6. The method according to any one of claims 2 to 5, characterized in that, The first scope includes at least one of the following: Repeat once or repeat twice; Repeat once, repeat twice, or repeat four times; Repeat once, repeat twice, repeat four times, or repeat eight times.

7. The method according to claim 2, characterized in that, In response to the first message used to indicate the number of repeated transmissions of msg4, the first message is a first DCI used to schedule the transmission of msg4. The first message is obtained by the network device through CRC scrambling based on a first TC-RNTI or a second TC-RNTI allocated to the terminal device. The second TC-RNTI is determined by the network device based on the first TC-RNTI and the number of repeated transmissions of msg4.

8. The method according to claim 5 or 7, characterized in that, The format of the second TC-RNTI includes at least one of the following: D+x; D*y+x; Where D is the first TC-RNTI, and y is a preset coefficient; The format of the second TC-RNTI includes D+x, where x indicates the number of repeated transmissions of msg4 minus 1; the format of the second TC-RNTI includes D*y+x, where x indicates the number of repeated transmissions of msg4.

9. The method according to claim 7, characterized in that, The first message indicates the number of times the msg4 is repeatedly transmitted via at least one of the modulation and coding scheme domain or the time domain resource allocation domain; Wherein, the number of repeated transmissions of msg4 indicated by the first message is within a first range of the number of repeated transmissions of msg4 determined by the network device.

10. The method according to claim 5 or 7, characterized in that, The format of the first DCI is DCI1_0.

11. A communication method, characterized in that, Applied to network devices, the method includes: Send a first message, which the terminal device uses to determine the number of times msg4 will be retransmitted.

12. The method according to claim 11, characterized in that, The first message is used to indicate a first range of the number of times msg4 is repeatedly transmitted or the number of times msg4 is repeatedly transmitted.

13. The method according to claim 12, characterized in that, In response to the first message used to indicate the first range, the first message includes at least one of MIB or SIB1.

14. The method according to claim 13, characterized in that, The MIB indicates the first range through first identification information, which includes at least one of the following: At least one bit in the kssb field; The reserved bits of the MIB; Unused code points in the pdcch-configSIB1 field.

15. The method according to claim 12, characterized in that, In response to the first message indicating the first range, the method further includes: Send a first DCI, which is used by the terminal device to determine the number of times the msg4 is repeatedly transmitted within the first range based on the first TC-RNTI and the first DCI allocated by the network device. Wherein, the first DCI is used to schedule the transmission of msg4; the first DCI is obtained by the network device through CRC scrambling based on the second TC-RNTI, and the second TC-RNTI is determined by the network device based on the first TC-RNTI allocated to the terminal device and the number of repeated transmissions of msg4.

16. The method according to any one of claims 12 to 15, characterized in that, The first scope includes at least one of the following: Repeat once or repeat twice; Repeat once, repeat twice, or repeat four times; Repeat once, repeat twice, repeat four times, or repeat eight times.

17. The method according to claim 12, characterized in that, In response to the first message used to indicate the number of repeated transmissions of msg4, the first message is a first DCI used to schedule the transmission of msg4. The first message is obtained by the network device through CRC scrambling based on a first TC-RNTI or a second TC-RNTI allocated to the terminal device. The second TC-RNTI is determined by the network device based on the first TC-RNTI and the number of repeated transmissions of msg4.

18. The method according to claim 15 or 17, characterized in that, The format of the second TC-RNTI includes at least one of the following: D+x; D*y+x; Where D is the first TC-RNTI, and y is a preset coefficient; The format of the second TC-RNTI includes D+x, where x indicates the number of repeated transmissions of msg4 minus 1; the format of the second TC-RNTI includes D*y+x, where x indicates the number of repeated transmissions of msg4.

19. The method according to claim 17, characterized in that, The first message indicates the number of times the msg4 is repeatedly transmitted via at least one of the modulation and coding scheme domain or the time domain resource allocation domain; Wherein, the number of repeated transmissions of msg4 indicated by the first message is within a first range of the number of repeated transmissions of msg4 determined by the network device.

20. The method according to claim 15 or 17, characterized in that, The format of the first DCI is DCI1_0.

21. A terminal device, characterized in that, include: The transceiver module is used to receive the first message; The processing module is used to determine the number of times message msg4 will be repeatedly transmitted based on the first message.

22. A network device, characterized in that, include: The transceiver module is used to send the first message, which is used by the terminal device to determine the number of times msg4 can be repeatedly transmitted based on the first message.

23. A terminal device, characterized in that, The network device is used to perform the method according to any one of claims 1 to 10.

24. A network device, characterized in that, The network device is used to perform the method of any one of claims 111 to 20.

25. A communication system, characterized in that, This includes network equipment and terminal equipment; The network device is configured to implement the method of any one of claims 1 to 10, and the terminal device is configured to implement the method of any one of claims 11 to 20.

26. A storage medium storing instructions, characterized in that, When the instructions are executed on the communication device, the communication device performs the method as described in any one of claims 1 to 10, or performs the method as described in any one of claims 11 to 20.

27. A program product comprising at least one of a program and instructions, characterized in that, When at least one of the programs or instructions is executed by a communication device, it implements the communication method of any one of claims 1 to 10, or implements the communication method of any one of claims 11 to 20.

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