Transmission method, communication device, communication system, and storage medium

Abstract

The present disclosure provides a transmission method, a communication device, a communication system, and a storage medium. The method comprises: determining that a reception of a contention-based (CB) message Msg3 has failed, and sending instruction information, the instruction information being used to instruct a terminal to fall back to one or more of the following: a random access channel (RACH) procedure, RACH-based EDT, and RACH-based SDT. The method of the present disclosure can reduce terminal power consumption and prevent wastage of transmission resources.

Description

Transmission methods, communication equipment, communication systems and storage media Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to transmission methods, communication equipment, communication systems and storage media. Background Technology

[0002] For Contention-Based (CB) messages (Msg), if most terminals use CB-Msg3 resources to initiate transmission, resource conflicts will occur, leading to transmission failure. Summary of the Invention

[0003] This disclosure provides a transmission method, communication equipment, communication system, and storage medium.

[0004] According to a first aspect of the embodiments of this disclosure, a transmission method is provided, performed by a network device, comprising:

[0005] If the reception of message Msg3 based on contention CB fails, an indication message is sent, wherein the indication message is used to instruct the terminal to fall back to one or more of the following: random access channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

[0006] According to a second aspect of the embodiments of this disclosure, a transmission method is provided, executed by a terminal, the method comprising:

[0007] Receive indication information, wherein the indication information is used to instruct the terminal to fall back to one or more of the following: Random Access Channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

[0008] According to a third aspect of the present disclosure, a transmission method is provided for a communication system, the communication system including a network device and a terminal, the method comprising:

[0009] When the network device determines that the message Msg3 based on contention CB has failed to be received, it sends an indication message to the terminal, wherein the indication message is used to instruct the terminal to fall back to one or more of the following: random access channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

[0010] According to a fourth aspect of the embodiments of this disclosure, a network device is provided, comprising:

[0011] The transceiver module is used to determine that the message Msg3 based on contention CB has failed to be received, and to send indication information, wherein the indication information is used to instruct the terminal to fall back to one or more of the following: random access channel RACH procedure, RACH-based EDT, and RACH-based SDT.

[0012] According to a fifth aspect of the embodiments of this disclosure, a terminal is provided, comprising:

[0013] The transceiver module is used to receive indication information, wherein the indication information is used to instruct the terminal to fall back to one or more of the following: Random Access Channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

[0014] According to a sixth aspect of the present disclosure, a communication device is provided, comprising:

[0015] One or more processors;

[0016] The processor is configured to invoke instructions to cause the communication device to execute any of the transmission methods described in the first or second aspect.

[0017] According to a seventh aspect of the present disclosure, a communication system is provided, including a network device and a terminal, wherein the terminal is configured to implement the transmission method described in the second aspect, and the network device is configured to implement the transmission method described in the first aspect.

[0018] According to an eighth aspect of the present disclosure, a storage medium is provided that stores instructions which, when executed on a communication device, cause the communication device to perform a transmission method as described in any of the first to second aspects.

[0019] Ninthly, embodiments of this disclosure provide a program product, including a computer program, which, when executed by a communication device, implements the transmission method as described in the first and second aspects.

[0020] In a tenth aspect, embodiments of this disclosure provide a computer program that, when run on a computer, causes the computer to perform the transmission method as described in the first and second aspects.

[0021] It is understood that the aforementioned network devices, terminals, communication devices, communication systems, storage media, program products, and computer programs 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. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0023] Figure 1 is a schematic diagram of the architecture of some communication systems provided in the embodiments of this disclosure;

[0024] Figure 2A is an interactive schematic diagram of a transmission method provided in an embodiment of this disclosure;

[0025] Figure 2B is a schematic diagram of the structure of the MAC sub-packet header according to an embodiment of the present disclosure;

[0026] Figure 3 is a schematic flowchart of a transmission method provided in another embodiment of this disclosure;

[0027] Figure 4 is a schematic flowchart of a transmission method provided in another embodiment of this disclosure;

[0028] Figure 5 is an interactive schematic diagram of the transmission method provided in another embodiment of this disclosure;

[0029] Figure 6A is a schematic diagram of the structure of a terminal provided in an embodiment of this disclosure;

[0030] Figure 6B is a schematic diagram of the structure of a network device provided in an embodiment of this disclosure;

[0031] Figure 7A is a schematic diagram of the structure of a communication device provided in an embodiment of this disclosure;

[0032] Figure 7B is a schematic diagram of the structure of a chip provided in an embodiment of this disclosure. Detailed Implementation

[0033] This disclosure provides a transmission method, communication device, communication system, and storage medium.

[0034] In a first aspect, embodiments of this disclosure provide a transmission method performed by a network device, the method comprising:

[0035] If the reception of message Msg3 based on contention CB fails, an indication message is sent, wherein the indication message is used to instruct the terminal to fall back to one or more of the following: random access channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

[0036] In the above embodiments, when the network device determines that CB Msg3 reception has failed, it can actively trigger an instruction to fall back to the RACH process, or fall back to RACH-based EDT (or RACH-based SDT), thereby avoiding the waste of radio resources, reducing the additional power consumption of the terminal, and reducing the failure probability of CB Msg3.

[0037] In conjunction with some embodiments of the first aspect, in some embodiments, the aforementioned indication information is carried by a first information field in the first media access control (MAC) sub-packet header.

[0038] In conjunction with some embodiments of the first aspect, in some embodiments, the first information field mentioned above includes one or more reserved bits in the first MAC sub-packet header.

[0039] In the above embodiments, the utilization rate of the first MAC sub-packet header is improved by utilizing one or more reserved bit indication information in the sub-packet header of the first MAC.

[0040] In conjunction with some embodiments of the first aspect, in some embodiments, the above-mentioned instruction information is carried by the second media access control (MAC) control element CE.

[0041] In conjunction with some embodiments of the first aspect, in some embodiments, the above-described second MAC CE satisfies one or more of the following:

[0042] The payload is 0 bytes;

[0043] Associated with a specific logical channel identifier (LCID);

[0044] Associated with a specific extended eLCID;

[0045] The second information field, with the first value, is used to indicate a rollback to the RACH procedure.

[0046] The third information field is the second value used to indicate whether to fall back to RACH-based EDT or RACH-based SDT.

[0047] In the above embodiments, the indication information can be carried by a flexible second MAC CE, which improves the flexibility of indication information transmission and provides conditions for further avoiding waste of wireless resources and reducing the additional power consumption of the terminal.

[0048] In conjunction with some embodiments of the first aspect, in some embodiments, the above-mentioned indication information is carried by downlink control information (DCI).

[0049] In conjunction with some embodiments of the first aspect, in some embodiments, for a narrowband Internet of Things (NB-IoT) terminal, the indication information is carried by a portion of bits from at least one of the following in the DCI: a new data indication field, and a hybrid automatic repeat request-acknowledge (HARQ-ACK) resource field.

[0050] In the above embodiments, by reusing some bits in a portion of the information field in the DCI to carry indication information, the flexibility of indication information transmission is further improved, providing conditions for further avoiding waste of wireless resources and reducing the additional power consumption of the terminal.

[0051] In conjunction with some embodiments of the first aspect, in some embodiments the above method further includes:

[0052] The indication information is scrambled using the temporary radio network identifier (RNTI) associated with the resource used by the failed CB Msg3.

[0053] In the above embodiments, by scrambling the indication information using the RNTI associated with the resources used by the failed CB Msg3, the reliability of the indication information transmission is ensured, which provides conditions for further avoiding waste of wireless resources and reducing the additional power consumption of the terminal.

[0054] Secondly, embodiments of this disclosure provide a transmission method executed by a terminal, the method comprising:

[0055] Receive indication information, wherein the indication information is used to instruct the terminal to fall back to one or more of the following: Random Access Channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

[0056] In conjunction with some embodiments of the second aspect, in some embodiments, the aforementioned indication information is carried by a first information field in the first media access control (MAC) sub-packet header.

[0057] In conjunction with some embodiments of the second aspect, in some embodiments, the first information field mentioned above includes one or more reserved bits in the MAC sub-packet header.

[0058] In conjunction with some embodiments of the second aspect, in some embodiments, the above-mentioned instruction information is carried by the second media access control (MAC) control element CE.

[0059] In conjunction with some embodiments of the second aspect, in some embodiments, the above-described second MAC CE satisfies one or more of the following:

[0060] The payload is 0 bytes;

[0061] Associated with a specific logical channel identifier (LCID);

[0062] Associated with a specific extended eLCID;

[0063] The second information field, with the first value, is used to indicate a rollback to the RACH procedure.

[0064] The third information field is the second value used to indicate whether to fall back to RACH-based EDT or RACH-based SDT.

[0065] In conjunction with some embodiments of the second aspect, in some embodiments, the above-mentioned indication information is carried by downlink control information (DCI).

[0066] In conjunction with some embodiments of the second aspect, in some embodiments, the terminal is a narrowband Internet of Things (NB-IoT) terminal, and the indication information is carried by a portion of bits of at least one of the following in the DCI: a new data indication field, and a hybrid automatic repeat request-acknowledge (HARQ-ACK) resource field.

[0067] In conjunction with some embodiments of the second aspect, in some embodiments the above method further includes:

[0068] The indication information is descrambled using the Resource Associated Radio Network Temporary Identifier (RNTI) used by CB Msg3.

[0069] Thirdly, embodiments of this disclosure provide a transmission method for a communication system, the communication system including network devices and terminals, the method comprising:

[0070] When the network device determines that the message Msg3 based on contention CB has failed to be received, it sends an indication message to the terminal, wherein the indication message is used to instruct the terminal to fall back to one or more of the following: random access channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

[0071] Fourthly, embodiments of this disclosure provide a network device, including:

[0072] The transceiver module is used to determine that the message Msg3 based on contention CB has failed to be received, and to send indication information, wherein the indication information is used to instruct the terminal to fall back to one or more of the following: random access channel RACH procedure, RACH-based EDT, and RACH-based SDT.

[0073] In conjunction with some embodiments of the fourth aspect, in some embodiments, the aforementioned indication information is carried by a first information field in the first media access control (MAC) sub-packet header.

[0074] In conjunction with some embodiments of the fourth aspect, in some embodiments, the first information field mentioned above includes one or more reserved bits in the first MAC sub-packet header.

[0075] In conjunction with some embodiments of the fourth aspect, in some embodiments, the above-mentioned instruction information is carried by the second media access control (MAC) control element CE.

[0076] In conjunction with some embodiments of the fourth aspect, in some embodiments, the above-described second MAC CE satisfies one or more of the following:

[0077] The payload is 0 bytes;

[0078] Associated with a specific logical channel identifier (LCID);

[0079] Associated with a specific extended eLCID;

[0080] The second information field, with the first value, is used to indicate a rollback to the RACH procedure.

[0081] The third information field is the second value used to indicate whether to fall back to RACH-based EDT or RACH-based SDT.

[0082] In conjunction with some embodiments of the fourth aspect, in some embodiments, the above-mentioned indication information is carried by downlink control information (DCI).

[0083] In conjunction with some embodiments of the fourth aspect, in some embodiments, for narrowband Internet of Things (NB-IoT) terminals, the indication information is carried by a portion of bits from at least one of the following in the DCI: a new data indication field, a hybrid automatic repeat request-acknowledge (HARQ-ACK) resource field.

[0084] In conjunction with some embodiments of the fourth aspect, in some embodiments, the above-described processing module is used to scramble the indication information using the temporary radio network identifier (RNTI) associated with the resource used by the failed CB Msg3.

[0085] Fifthly, embodiments of this disclosure provide a terminal, including:

[0086] The transceiver module is used to receive indication information, wherein the indication information is used to instruct the terminal to fall back to one or more of the following: Random Access Channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

[0087] In conjunction with some embodiments of the fifth aspect, in some embodiments, the aforementioned indication information is carried by a first information field in the first media access control (MAC) sub-packet header.

[0088] In conjunction with some embodiments of the fifth aspect, in some embodiments, the first information field mentioned above includes one or more reserved bits in the first MAC sub-packet header.

[0089] In conjunction with some embodiments of the fifth aspect, in some embodiments, the above-mentioned instruction information is carried by the second media access control (MAC) control element CE.

[0090] In conjunction with some embodiments of the fifth aspect, in some embodiments, the above-described second MAC CE satisfies one or more of the following:

[0091] The payload is 0 bytes;

[0092] Associated with a specific logical channel identifier (LCID);

[0093] Associated with a specific extended eLCID;

[0094] The second information field, with the first value, is used to indicate a rollback to the RACH procedure.

[0095] The third information field is the second value used to indicate whether to fall back to RACH-based EDT or RACH-based SDT.

[0096] In conjunction with some embodiments of the fifth aspect, in some embodiments, the above-mentioned indication information is carried by downlink control information (DCI).

[0097] In conjunction with some embodiments of the fifth aspect, in some embodiments, for narrowband Internet of Things (NB-IoT) terminals, the indication information is carried by a portion of bits from at least one of the following in the DCI: a new data indication field, and a hybrid automatic repeat request-acknowledge (HARQ-ACK) resource field.

[0098] In conjunction with some embodiments of the fifth aspect, in some embodiments, the above-described processing module is used to descramble the indication information using the Resource Associated Radio Network Temporary Identifier (RNTI) used by CB Msg3.

[0099] In a sixth aspect, embodiments of this disclosure provide a communication device comprising: one or more processors; one or more memories for storing instructions; wherein the processors are configured to invoke the instructions to cause 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.

[0100] In a seventh aspect, embodiments of this disclosure provide a communication system comprising: a network device and a terminal; wherein the terminal is configured to perform the method described in the second aspect and optional implementations thereof, and the network device is configured to perform the method described in the first aspect and optional implementations thereof.

[0101] Eighthly, embodiments of this disclosure provide a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform the method described in the first aspect, an optional implementation of the first aspect, the second aspect, and an optional implementation of the second aspect.

[0102] In a ninth aspect, embodiments of this disclosure provide a program product including a computer program that, when executed by a processor, implements 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.

[0103] 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.

[0104] It is understood that the aforementioned network devices, terminals, communication devices, communication systems, storage media, program products, and computer programs 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.

[0105] This disclosure provides a transmission method, a communication device, a communication system, and a storage medium. In some embodiments, the terms "transmission method" and "information processing method," "information sending method," and "information receiving method" can be used interchangeably; the terms "communication device" and "information processing device," "information sending device," and "information receiving device" can be used interchangeably; and the terms "information processing system," "communication system," "information sending system," and "information receiving system" can be used interchangeably.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] In this embodiment of the disclosure, unless otherwise stated, elements expressed in the singular form, such as "a," "an," "the," "the," "the," "the," "the," "the," "this," etc., can mean "one and only one," or "one or more," "at least one," etc. For example, when using articles such as "a," "an," "the," etc. in translation, the noun following the article can be understood as either a singular expression or a plural expression.

[0110] In the embodiments of this disclosure, "multiple" refers to two or more.

[0111] 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" and the like can be used interchangeably.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] In some embodiments, “including A,” “containing A,” “for indicating A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0116] In some embodiments, terms such as "time / frequency" and "time-frequency domain" refer to the time domain and / or frequency domain.

[0117] 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.

[0118] 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”.

[0119] 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.

[0120] In some embodiments, "network" can be interpreted as devices included in a network (e.g., access network devices, core network devices, etc.).

[0121] In some embodiments, the terms "access network device (AN device)," "radio access network device (RAN device)," "base station (BS)," "radio base station," "fixed station," "node," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "antenna panel," "antenna array," "cell," "macro cell," "small cell," "femto cell," "pico cell," "sector," "cell group," "serving cell," "carrier," "component carrier," and "bandwidth part (BWP)" can be used interchangeably.

[0122] In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal", "mobile station (MS)", "mobile terminal (MT)", "subscriber station", "mobile unit", "subscriber unit", "wireless unit", "remote unit", "mobile device", "wireless device", "wireless communication device", "remote device", "mobile subscriber station", "access terminal", "mobile terminal", "wireless terminal", "remote terminal", "handset", "user agent", "mobile client", and "client" can be used interchangeably.

[0123] In some embodiments, access network devices, core network devices, or network devices can be replaced by terminals. For example, embodiments of this disclosure can also be applied to structures where communication between access network devices, core network devices, or network devices and terminals is replaced by communication between multiple terminals (e.g., device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, the structure can also be configured such that the terminal has all or part of the functions of the access network device. Furthermore, terms such as "uplink" and "downlink" can be replaced with terms corresponding to communication between terminals (e.g., "sidelink"). For example, uplink channel, downlink channel, etc., can be replaced with sidelink channel, and uplink link, downlink, etc., can be replaced with sidelink link.

[0124] In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, core network device, or network device may also be configured to have all or some of the functions of the terminal.

[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] Figure 1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure. As shown in Figure 1, the communication system 100 may include a terminal 101 and a network device 102; wherein, the network device 102 may include at least one of an access network device and a core network device.

[0129] In some embodiments, the terminal includes, but is not limited to, at least one of the following: mobile phone, wearable device, Internet of Things (IoT) device, narrowband Internet of Things (NB-IoT) device, car with communication capabilities, smart car, tablet computer, computer with wireless transceiver capabilities, 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.

[0130] In some embodiments, the access network device is, for example, a node or device that connects a terminal to a wireless network. The access network device may include, but is not limited to, at least one of the following in a 5G communication system: evolved Node B (eNB), next-generation eNB (ng-eNB), next-generation Node B (gNB), node B (NB), home node B (HNB), home evolved node B (HeNB), wireless backhaul device, radio network controller (RNC), base station controller (BSC), base transceiver station (BTS), base band unit (BBU), mobile switching center, base station in a 6G communication system, open RAN, cloud RAN, base station in other communication systems, and access node in a wireless fidelity (WiFi) system.

[0131] In some embodiments, the technical solutions of this disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within access network devices involved in the embodiments of this disclosure can be transformed into internal interfaces of Open RAN. The processes and information interactions between these internal interfaces can be implemented by software or programs.

[0132] 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.

[0133] 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 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).

[0134] 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.

[0135] 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. 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.

[0136] 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, systems utilizing other transmission methods, and next-generation systems built upon them, etc. Furthermore, multiple systems can be combined (e.g., a combination of LTE or LTE-A with 5G).

[0137] In communication systems, for small data transmission, the 3rd Generation Partnership Project (3GPP) introduced a mechanism for small data transmission (SDT) via (Message, Msg)3 during random access. This allows terminals to transmit small amounts of data in the early stages of connection establishment, thereby reducing connection establishment time and signaling overhead. This mechanism improves data transmission efficiency and reduces power consumption.

[0138] In some embodiments, to improve uplink capacity, contention-based Early Data Transmission (EDT) for Msg3 is introduced in Non-Terrestrial Networks (NTNs). This means that small data packets are transmitted directly using the contentionable Msg3 resource instead of Msg1 and Msg2. Because Msg3 transmission uses contention, conflicts may occur when multiple terminals use the same resource.

[0139] In some embodiments, during CB-Msg3 EDT or CB-Msg3 SDT, contention for Msg3 resources can lead to resource conflicts and transmission failures if multiple terminals attempt to initiate transmissions using CB-Msg3 resources. One possible method to handle CB-Msg3 EDT or CB-Msg3 SDT failures is for the terminal to fall back to a Random Access Channel (RACH) EDT or RACH-based SDT procedure after multiple consecutive failures. However, in scenarios with high CB-Msg3 resource load, continuous attempts at CB-Msg3 EDT or CB-Msg3 SDT transmissions may result in consecutive failures, increasing the failure probability, wasting radio resources, and causing additional power consumption for the terminal. A more effective fallback mechanism is needed.

[0140] Figure 2A is an interactive schematic diagram of a transmission method according to an embodiment of the present disclosure. As shown in Figure 2A, the present disclosure relates to a transmission method for a communication system 100; the method includes:

[0141] Step 2101: Determine that the message Msg3 based on the contention CB has failed to be received. Use the RNTI associated with the resource used by the failed CB Msg3 to scramble the indication information.

[0142] The indication information is used to instruct the terminal to fallback to one or more of the following: Random Access Channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

[0143] In some embodiments, CB-Msg3 reception failure may be due to multiple terminals using CB-Msg3 resources to initiate transmissions, resulting in resource conflicts and thus causing the network device to fail to receive the data.

[0144] In some embodiments, CB-Msg3 reception failure may be due to persistent transmission conflicts or network congestion, etc., which are not limited in this disclosure.

[0145] In some embodiments, a network device may determine that CB-Msg3 reception has failed when it detects received signal energy but is unable to decode the corresponding Msg3 Physical Uplink Shared Channel (PUSCH) data.

[0146] In some embodiments, a network device may determine that CB-Msg3 reception has failed when it first detects received signal energy but is unable to decode Msg3 PUSCH data.

[0147] In some embodiments, the network device may determine CB-Msg3 reception failure only after detecting received signal energy several times consecutively but being unable to decode the corresponding Msg3 PUSCH data. For example, the network device may determine CB-Msg3 reception failure only after detecting received signal energy two (or three, or four times, etc.) consecutively but being unable to decode the corresponding Msg3 PUSCH data.

[0148] In some embodiments, the network device is a New Radio (NR) network device. The corresponding indication information can be used to instruct the terminal to fall back to the RACH procedure and / or fall back to RACH-based SDT.

[0149] In some embodiments, the network device is a Long Term Evolution (LTE) network device. The corresponding indication information can be used to instruct the terminal to fall back to the RACH procedure and / or fall back to the RACH-based EDT.

[0150] In some embodiments, since the terminal uses the resource-associated Radio Network Temporary Identifier (RNTI) that sent Msg3 to receive Msg4, in order to ensure that the terminal can reliably receive the indication information, the network device can use the resource-associated RNTI used by the failed CB Msg3 to scramble the indication information in the Physical Downlink Control Channel (PDCCH) or Physical Downlink Shared Channel (PDSCH).

[0151] In some embodiments, the network device can scramble the PDCCH or PDSCH by using the RNTI associated with the resource used by the failed CB Msg3, thereby ensuring that the terminal that sent the failed CB Msg3 can reliably receive the indication information.

[0152] Step 2102: The network device sends an instruction message.

[0153] In some embodiments, the indication information may be carried in a first information field in a first media access control (MAC) subheader.

[0154] In some embodiments, the first information field may include specific bits from the first MAC subheader. For example, the first information field may include one or more reserved bits from the first MAC subheader.

[0155] Figure 2B is a schematic diagram of the structure of the MAC sub-header according to an embodiment of the present disclosure.

[0156] As shown in Figure 2B, the MAC subheader includes E, T, R, and BI bits. E stands for Extension, indicating whether the MAC sub-protocol data unit (PDU) containing this MAC subheader is the last in the MAC PDU. T is the Type field, indicating whether the MAC subheader contains specific information, such as a Random Access Preamble IDentifier (RAPID) or a Backoff Indicator (BI). R is the Reserved field, reserved for future extensions or specific purposes. BI is the Backoff Indicator field, used to identify network overload conditions. When the network is overloaded, the BI field can be set to a specific value to indicate how long a terminal (such as a UE) should wait before attempting to retransmit data.

[0157] In some embodiments, the first information field may include one or two R bits from the MAC subheader shown in FIG2B.

[0158] In some embodiments, the network device is an LTE network device, then one of the R bits (e.g., the first R bit, set to 1) can be used to indicate the UE fallback to the RACH EDT procedure, and / or another of the R bits (e.g., the second R bit, set to 1) can be used to indicate the UE fallback to the RACH procedure.

[0159] In some embodiments, the network device is an NR network device, then one of the R bits (e.g., the first R bit, set to 1) can be used to indicate the UE fallback to the RACH SDT procedure, and / or another of the R bits (e.g., the second R bit, set to 1) can be used to indicate the UE fallback to the RACH procedure.

[0160] In some embodiments, if the network device indicates indication information through two R bits in the first MAC sub-packet header, and both R bits are set to 1, then for an LTE terminal, this indication information indicates that the terminal can fall back to the RACH procedure or fall back to the RACH-based EDT procedure. For an NR terminal, this indication information indicates that the terminal can fall back to the RACH procedure or fall back to the RACH-based SDT procedure. In this case, the terminal can choose a fallback procedure according to its own needs or protocol agreement. For example, for an LTE terminal, the terminal can choose to fall back to the RACH procedure or fall back to the RACH-based EDT, according to its own needs or protocol agreement. Similarly, for an NR terminal, the terminal can choose to fall back to the RACH procedure or fall back to the RACH-based SDT, according to its own needs or protocol agreement.

[0161] In some embodiments, the instruction information may also be carried via a second media access control MAC control element (CE).

[0162] In some embodiments, the second MAC CE can be a newly defined MAC CE.

[0163] In some embodiments, the second MAC CE can be a MAC CE with a 0-byte payload.

[0164] In some embodiments, the second MAC CE may be associated with a specific Logical Channel Identifier (LCID).

[0165] In some embodiments, the second MAC CE may be associated with a specific Extended Logical Channel Identifier (eLCID).

[0166] In some embodiments, the specific LCID and eLCID can be newly defined identifiers, which can be specifically used to identify the type or purpose of certain information or data for instructing the terminal to rollback. In this embodiment of the disclosure, the second MAC CE is associated with the specific LCID or eLCID, so that after receiving the second MAC CE, the terminal can determine that it has received the instruction information indicating rollback sent by the network device, and then can rollback based on the instruction information.

[0167] In some embodiments, when the second information field in the second MAC CE is a first value, it can be used to instruct the terminal to fall back to the RACH procedure.

[0168] In some embodiments, when the third information field in the second MAC CE is a second value, it can be used to instruct the terminal to fall back to RACH-based EDT or RACH-based SDT.

[0169] In some embodiments, the second information field and the third information field may each include one or more bits in the second MAC CE sub-header.

[0170] In some embodiments, the second information field and the third information field can be the same information field, for example, both being the same bit in the second MAC CE sub-packet header. In this case, the first value and the second value can be different values, that is, different values ​​can be used to instruct the terminal to fall back to different procedures.

[0171] For example, the second information field includes a bit in the second MAC CE sub-packet header. A bit that is 1 (first value) indicates a fallback to the RACH EDT (or RACH SDT) procedure, and a bit that is 0 (second value) indicates a fallback to the RACH procedure. Alternatively, a bit that is 0 (first value) indicates a fallback to the RACH EDT (or RACH SDT) procedure, and a bit that is 1 (second value) indicates a fallback to the RACH procedure.

[0172] In some embodiments, the second information field and the third information field can be different information fields. For example, the second information field may be a bit in the second MAC CE sub-packet header, and the third information field may be another bit in the second MAC CE. In this case, the first value and the second value can be different values.

[0173] For example, when a bit in the third information field is the first value (e.g., 1 or 0), it indicates a rollback to the RACH EDT (or RACH SDT) procedure. When a bit in the second information field is the second value (if the first value is 1, then the second value can be 0; if the first value is 0, then the second value can be 1), it indicates a rollback to the RACH procedure.

[0174] In some embodiments, the second information field and the third information field can be different information fields. For example, the second information field may be a bit in the second MAC CE sub-header, and the third information field may be another bit in the second MAC CE. In this case, the first value and the second value can be the same. For instance, if one bit in the third information field is a second value (e.g., 1 or 0), it indicates a fallback to the RACH EDT (or RACH SDT) procedure, and if the other bit in the corresponding second information field is a first value (e.g., 1 or 0), it indicates a fallback to the RACH procedure.

[0175] In some embodiments, if the second information field in the second MAC CE received by the terminal is a first value and the third information field is a second value, the terminal can choose a fallback procedure based on its own needs or the protocol agreement. For example, for an LTE terminal, if the second information field in the second MAC CE received by the terminal is a first value and the third information field is a second value, the LTE terminal may choose to fall back to the RACH procedure or to the RACH-based EDT. Alternatively, for an NR terminal, if the second information field in the second MAC CE received by the terminal is a first value and the third information field is a second value, the LTE terminal may choose to fall back to the RACH procedure or to the RACH-based SDT.

[0176] In some embodiments, the indication information may also be carried by downlink control information (DCI).

[0177] In some embodiments, indication information can be carried through a reserved field in the DCI.

[0178] In some embodiments, for narrowband Internet of Things (NB-IoT) terminals, the DCI format is DCI format N1, which can use several bits in the protocol-reserved new data indicator field and / or Hybrid Automatic Repeat reQuest ACKnowledgment (HARQ-ACK) resource field to indicate UE fallback to RACH EDT (or RACH SDT) or RACH procedure.

[0179] In some embodiments, the terminal receives instruction information.

[0180] In step S2103, the terminal uses the RNTI associated with the resource used by CB Msg3 to descramble the indication information.

[0181] In some embodiments, the terminal can use the Temporary Cell (TC) RNTI used when sending Msg3 to decode the PDCCH or PDSCH. After obtaining the scrambled indication information, the terminal can then use the Resource Association RNTI used when sending Msg3 to descramble the indication information, thereby determining the specific indication of the network device.

[0182] In some embodiments, if the network device instructs the terminal to fall back to RACH, then the terminal can fall back to the RACH procedure. Alternatively, if the network device instructs the terminal (LTE terminal) to fall back to RACH-based EDT, then the terminal can fall back to RACH-based EDT. Alternatively, if the network device instructs the terminal (NR terminal) to fall back to RACH-based SDT, then the terminal can fall back to RACH-based SDT, thereby avoiding the terminal continuously attempting CB-Msg3 EDT (or CB-Msg3 SDT), which wastes radio resources and increases the failure probability, saving the terminal's extra power consumption and communication resources.

[0183] In some embodiments, if the network device instructs the terminal to fall back to RACH, or RACH-based EDT (or SDT), the terminal can choose a fallback procedure as needed or according to protocol agreement. For example, an NR terminal might choose to fall back to the RACH procedure or to RACH-based SDT. Alternatively, an LTE terminal might choose to fall back to the RACH procedure or to RACH-based EDT.

[0184] In summary, in the above embodiments, when the network device determines that CB-Msg3 reception has failed, it can send an indication message to the terminal to instruct the terminal to fall back to the RACH procedure or to the RACH-based SDT (or EDT). This triggers the CB-Msg3 fallback process by the network device, saving the terminal's additional power consumption, conserving communication resources, and reducing the probability of CB-Msg3 failure.

[0185] The transmission method involved in the embodiments of this disclosure may include at least one of steps 2101 to 2102. For example, step 2101 may be implemented as a separate embodiment, and step 2102 may be implemented as a separate embodiment, but is not limited thereto.

[0186] In this implementation or embodiment, unless there is contradiction, each step can be independent, arbitrarily combined or exchanged in order, optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other implementations or other embodiments.

[0187] Figure 3 is a flowchart illustrating a transmission method according to an embodiment of the present disclosure. As shown in Figure 3, the present disclosure relates to a transmission method for a network device, the method comprising:

[0188] Step 3101: Determine that the message Msg3 based on contention CB has failed to be received, and send an indication message.

[0189] The indication information is used to instruct the terminal to fall back to one or more of the following: Random Access Channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

[0190] Optionally, the aforementioned indication information is carried in the first information field of the first media access control (MAC) sub-packet header.

[0191] Optionally, the first information field mentioned above includes one or more reserved bits in the first MAC sub-packet header.

[0192] Optionally, the aforementioned instruction information is carried by the second media access control (MAC) control element CE.

[0193] Optionally, the above-mentioned second MAC CE satisfies one or more of the following:

[0194] The payload is 0 bytes;

[0195] Associated with a specific logical channel identifier (LCID);

[0196] Associated with a specific extended eLCID;

[0197] The second information field, with the first value, is used to indicate a rollback to the RACH procedure.

[0198] The third information field is the second value used to indicate whether to fall back to RACH-based EDT or RACH-based SDT.

[0199] Optionally, the aforementioned indication information is carried through downlink control information (DCI).

[0200] Optionally, for narrowband Internet of Things (NB-IoT) terminals, the aforementioned indication information is carried by a portion of bits from at least one of the following in the DCI: a new data indication field, and a hybrid automatic repeat request-acknowledge (HARQ-ACK) resource field.

[0201] Optionally, the above method further includes:

[0202] The indication information is scrambled using the temporary radio network identifier (RNTI) associated with the resource used by the failed CB Msg3.

[0203] For a detailed description of step 3101, please refer to the above embodiment.

[0204] Figure 4 is a flowchart illustrating a transmission method according to an embodiment of the present disclosure. As shown in Figure 4, the present disclosure relates to a transmission method for a terminal, the method comprising:

[0205] Step 4101: Receive indication information, wherein the indication information is used to instruct the terminal to fall back to one or more of the following: Random Access Channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

[0206] The aforementioned indication information is sent by the network device when it determines that the message Msg3 based on contention CB has failed to be received.

[0207] Optionally, the aforementioned indication information is carried in the first information field of the first media access control (MAC) sub-packet header.

[0208] Optionally, the first information field mentioned above includes one or more reserved bits in the MAC sub-packet header.

[0209] Optionally, the aforementioned instruction information is carried by the second media access control (MAC) control element CE.

[0210] Optionally, the above-mentioned second MAC CE satisfies one or more of the following:

[0211] The payload is 0 bytes;

[0212] Associated with a specific logical channel identifier (LCID);

[0213] Associated with a specific extended eLCID;

[0214] The second information field, with the first value, is used to indicate a rollback to the RACH procedure.

[0215] The third information field is the second value used to indicate whether to fall back to RACH-based EDT or RACH-based SDT.

[0216] Optionally, the aforementioned indication information is carried through downlink control information (DCI).

[0217] Optionally, the terminal is a narrowband Internet of Things (NB-IoT) terminal, and the indication information is carried by a portion of the following bits in the DCI: new data indication field, hybrid automatic repeat request-acknowledge (HARQ-ACK) resource field.

[0218] For a detailed description of step 4101, please refer to the above embodiment description.

[0219] Figure 5 is an interactive schematic diagram of a transmission method according to an embodiment of the present disclosure. As shown in Figure 5, the present disclosure relates to a transmission method for a communication system, which includes a network device and a terminal. The method includes at least one of the following:

[0220] Step 5101: The network device determines that the message Msg3 based on contention CB has failed to be received and sends an indication message to the terminal.

[0221] The indication information is used to instruct the terminal to fall back to one or more of the following: Random Access Channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

[0222] In some embodiments, the above methods may include various optional embodiments of the methods described in the embodiments of the communication system side, terminal side, network device side, etc., which will not be repeated here.

[0223] The following is an exemplary description of the above method.

[0224] In this embodiment of the disclosure, the CB-MSG3 fallback process is triggered by the network device. When the network device detects a CB-Msg3 reception failure, for example, detecting received signal energy but being unable to decode the corresponding Msg3 PUSCH data, the network device can send a downlink command to instruct the UE to fall back to the RACH EDT (or SDT) or RACH process to reduce the CB-MSG3 resource load.

[0225] Optionally, downlink commands can be scheduled via PDCCH, which can scramble using the RNTI associated with the CB-Msg resource. That is, Msg4 can be scrambled using the same RNTI as the correctly received Msg3.

[0226] Optionally, the network device may instruct the UE to fall back to RACH EDT (or SDT) or fall back to the RACH procedure via a specific bit in the MAC subheader.

[0227] In some embodiments, when the structure of the MAC subheader is as shown in FIG2B, that is, when there are two reserved R bits in the MAC subheader and they are set to 0, one of the R bits (e.g., the first R bit, set to 1) can be used to indicate the UE fallback to the RACH EDT (or RACH SDT) procedure, and / or one of the R bits (e.g., the second R bit, set to 1) can be used to indicate the UE fallback to the RACH procedure.

[0228] Optionally, the network device can instruct the UE to fallback to RACH EDT (SDT) or fall back to the RACH procedure via a new MAC CE.

[0229] In some embodiments, the content of the new MAC CE can satisfy the following options:

[0230] The MAC CE indicates that the UE should fall back to the RACH EDT (or RACH SDT) procedure. The MAC CE can be a 0-byte payload, and the new MAC CE can be associated with a newly defined specific LCID (or eLCID).

[0231] The MAC CE instructs the UE to fall back to the RACH procedure. The MAC CE can be a 0-byte payload, and the new MAC CE can be associated with a newly defined specific LCID (or eLCID).

[0232] The MAC CE indicates whether the UE falls back to the RACH EDT (or RACH SDT) procedure or returns to the RACH procedure. For example, one bit being 1 indicates a fallback to the RACH EDT (or RACH SDT) procedure, and 0 indicates a fallback to the RACH procedure. Alternatively, one bit being 1 indicates a fallback to the RACH EDT (RACH SDT) procedure, and another bit being 1 indicates a fallback to the RACH procedure. Furthermore, the new MAC CE can be associated with a newly defined specific LCID (or eLCID).

[0233] Optionally, the network device can instruct the UE to fall back to RACH EDT (RACH SDT) or fall back to the RACH procedure via DCI.

[0234] In some embodiments, such as DCI format N1 for NB-IoT UEs, several bits in the new data indicator field and / or HARQ-ACK resource field reserved in the protocol can be used to indicate the UE fallback to RACH EDT (or RACH SDT) or RACH procedure.

[0235] This disclosure also provides an apparatus for implementing any of the above methods. For example, an apparatus is provided that includes units or modules for implementing the steps performed by the terminal in any of the above methods. Alternatively, another apparatus is provided that includes units or modules for implementing the steps performed by a network device (e.g., an access network device, a core network functional node, a core network device, etc.) in any of the above methods.

[0236] 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.

[0237] 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).

[0238] Figure 6A is a schematic diagram of the structure of a network device according to an embodiment of this disclosure. Network device 6100 is used to perform any of the above methods. In some embodiments, as shown in Figure 6A, network device 6100 may include at least one of a transceiver module 6101, a processing module 6102, etc. In some embodiments, the transceiver module is used to determine that the message Msg3 based on contention CB has failed to be received, and to send indication information, wherein the indication information is used to instruct the terminal to fall back to one or more of the following: Random Access Channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

[0239] Optionally, the aforementioned indication information is carried in the first information field of the first media access control (MAC) sub-packet header.

[0240] Optionally, the first information field mentioned above includes one or more reserved bits in the first MAC sub-packet header.

[0241] Optionally, the aforementioned instruction information is carried by the second media access control (MAC) control element CE.

[0242] Optionally, the above-mentioned second MAC CE satisfies one or more of the following:

[0243] The payload is 0 bytes;

[0244] Associated with a specific logical channel identifier (LCID);

[0245] Associated with a specific extended eLCID;

[0246] The second information field, with the first value, is used to indicate a rollback to the RACH procedure.

[0247] The third information field is the second value used to indicate whether to fall back to RACH-based EDT or RACH-based SDT.

[0248] Optionally, the aforementioned indication information is carried through downlink control information (DCI).

[0249] Optionally, for narrowband Internet of Things (NB-IoT) terminals, the indication information is carried by a portion of bits from at least one of the following in the DCI: a new data indication field, and a hybrid automatic repeat request-acknowledge (HARQ-ACK) resource field.

[0250] Optionally, the above processing module is used to scramble the indication information using the temporary radio network identifier (RNTI) associated with the resource used by the failed CB Msg3.

[0251] Optionally, the transceiver module is used to perform at least one of the communication steps (such as step 2102, step 3101, step 4101, but not limited thereto) performed by the network device 102 in any of the above methods, which will not be described in detail here.

[0252] Optionally, the above processing module is used to execute the processing steps performed by terminal 101 in any of the above methods, such as step 2101.

[0253] Figure 6B is a schematic diagram of the structure of a terminal according to an embodiment of this disclosure. Terminal 6200 is used to execute any of the above methods. In some embodiments, as shown in Figure 6B, terminal 6200 may include at least one of a transceiver module 6201, a processing module 6202, etc. In some embodiments, the transceiver module is used to receive indication information, wherein the indication information is used to instruct the terminal to fall back to one or more of the following: a random access channel (RACH) procedure, a RACH-based EDT, and a RACH-based SDT.

[0254] Optionally, the aforementioned indication information is carried in the first information field of the first media access control (MAC) sub-packet header.

[0255] Optionally, the first information field mentioned above includes one or more reserved bits in the first MAC sub-packet header.

[0256] Optionally, the aforementioned instruction information is carried by the second media access control (MAC) control element CE.

[0257] Optionally, the above-mentioned second MAC CE satisfies one or more of the following:

[0258] The payload is 0 bytes;

[0259] Associated with a specific logical channel identifier (LCID);

[0260] Associated with a specific extended eLCID;

[0261] The second information field, with the first value, is used to indicate a rollback to the RACH procedure.

[0262] The third information field is the second value used to indicate whether to fall back to RACH-based EDT or RACH-based SDT.

[0263] Optionally, the aforementioned indication information is carried through downlink control information (DCI).

[0264] Optionally, for narrowband Internet of Things (NB-IoT) terminals, the indication information is carried by a portion of bits from at least one of the following in the DCI: a new data indication field, and a hybrid automatic repeat request-acknowledge (HARQ-ACK) resource field.

[0265] Optionally, the above method further includes:

[0266] Optionally, the above processing module is used for:

[0267] The indication information is descrambled using the Resource Associated Radio Network Temporary Identifier (RNTI) used by CB Msg3.

[0268] Optionally, the transceiver module is used to perform at least one of the communication steps (such as step 2102, step 3101, step 4101, but not limited thereto) performed by terminal 101 in any of the above methods, which will not be described in detail here.

[0269] Optionally, the above processing module is used to execute the processing steps performed by terminal 101 in any of the above methods, such as step 2103.

[0270] Figure 7A is a schematic diagram of the structure of the communication device 7100 proposed in an embodiment of this disclosure. The communication device 7100 can be a network device (e.g., access network device, core network device, etc.), a terminal (e.g., user equipment or the aforementioned network device), 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 7100 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.

[0271] As shown in Figure 7A, the communication device 7100 includes one or more processors 7101. The processor 7101 can be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit (CPU). The baseband processor can be used to process communication protocols and communication data, while the CPU can 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. The processor 7101 is used to invoke instructions to cause the communication device 7100 to execute any of the above methods.

[0272] In some embodiments, the communication device 7100 further includes one or more memories 7102 for storing instructions. Optionally, all or part of the memories 7102 may also be located outside the communication device 7100.

[0273] In some embodiments, the communication device 7100 further includes one or more transceivers 7103. When the communication device 7100 includes one or more transceivers 7103, the communication steps such as sending and receiving in the above method are performed by the transceivers 7103, and other steps are performed by the processor 7101.

[0274] In some embodiments, a transceiver may include a receiver and a transmitter, which may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, etc., may be used interchangeably; the terms transmitter, transmitting unit, transmitter, transmitting circuit, etc., may be used interchangeably; and the terms receiver, receiving unit, sensing signal receiving end, receiving circuit, etc., may be used interchangeably.

[0275] Optionally, the communication device 7100 further includes one or more interface circuits 7104, which are connected to the memory 7102. The interface circuits 7104 can be used to receive signals from the memory 7102 or other devices, and can be used to send signals to the memory 7102 or other devices. For example, the interface circuits 7104 can read instructions stored in the memory 7102 and send the instructions to the processor 7101.

[0276] The communication device 7100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 7100 described in this disclosure is not limited thereto, and the structure of the communication device 7100 may not be limited by FIG. 7a. The communication device may be a standalone device or a 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 and programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a sensing signal 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.

[0277] Figure 7B is a schematic diagram of the structure of the chip 7200 according to an embodiment of this disclosure. For cases where the communication device 7100 can be a chip or a chip system, the schematic diagram of the chip 7200 shown in Figure 7B can be referenced, but is not limited thereto.

[0278] Chip 7200 includes one or more processors 7201, which are used to invoke instructions to cause chip 7200 to perform any of the above methods.

[0279] In some embodiments, chip 7200 further includes one or more interface circuits 7202 connected to memory 7203. Interface circuits 7202 can be used to receive signals from memory 7203 or other devices, and can also be used to send signals to memory 7203 or other devices. For example, interface circuit 7202 can read instructions stored in memory 7203 and send those instructions to processor 7201. Optionally, terms such as interface circuit, interface, transceiver pin, and transceiver can be used interchangeably.

[0280] In some embodiments, chip 7200 further includes one or more memories 7203 for storing instructions. Optionally, all or part of the memories 7203 may be located outside of chip 7200.

[0281] This disclosure also proposes a storage medium storing instructions that, when executed on the communication device 7100, cause the communication device 7100 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.

[0282] This disclosure also provides a program product that, when executed by the communication device 7100, causes the communication device 7100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0283] This disclosure also proposes a computer program that, when run on a computer, causes the computer to perform any of the above methods.

[0284] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer programs. When the computer program is loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this disclosure are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program can be transferred from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., high-density digital video discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0285] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0286] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0287] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A transmission method, characterized in that, Performed by a network device, the method includes: If the reception of message Msg3 based on contention CB fails, an indication message is sent, wherein the indication message is used to instruct the terminal to fall back to one or more of the following: random access channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

2. The method as described in claim 1, characterized in that, The instruction information is carried in the first information field of the first media access control (MAC) sub-packet header.

3. The method as described in claim 2, characterized in that, The first information field includes one or more reserved bits in the first MAC sub-packet header.

4. The method as described in claim 1, characterized in that, The instruction information is carried by the second media access control (MAC) control element CE.

5. The method as described in claim 4, characterized in that, The second MAC CE satisfies one or more of the following: The payload is 0 bytes; Associated with a specific logical channel identifier (LCID); Associated with a specific extended eLCID; The second information field, with the first value, is used to indicate a rollback to the RACH procedure. The third information field is the second value used to indicate whether to fall back to RACH-based EDT or RACH-based SDT.

6. The method as described in claim 1, characterized in that, The indication information is carried through downlink control information (DCI).

7. The method as described in claim 6, characterized in that, For narrowband Internet of Things (NB-IoT) terminals, the indication information is carried by a portion of bits from at least one of the following in the DCI: a new data indication field, and a hybrid automatic repeat request-acknowledge (HARQ-ACK) resource field.

8. The method according to any one of claims 1-7, characterized in that, The method further includes: The indication information is scrambled using the temporary radio network identifier (RNTI) associated with the resource used by the failed CB Msg3.

9. A transmission method, characterized in that, The method, executed by a terminal, includes: Receive indication information, wherein the indication information is used to instruct the terminal to fall back to one or more of the following: Random Access Channel (RACH) procedure, RACH-based EDT, and RACH-based SDT.

10. The method as described in claim 9, characterized in that, The instruction information is carried in the first information field of the first media access control (MAC) sub-packet header.

11. The method as described in claim 10, characterized in that, The first information field includes one or more reserved bits in the MAC sub-packet header.

12. The method as described in claim 9, characterized in that, The instruction information is carried by the second media access control (MAC) control element CE.

13. The method as described in claim 12, characterized in that, The second MAC CE satisfies one or more of the following: The payload is 0 bytes; Associated with a specific logical channel identifier (LCID); Associated with a specific extended eLCID; The second information field, with the first value, is used to indicate a rollback to the RACH procedure. The third information field is the second value used to indicate whether to fall back to RACH-based EDT or RACH-based SDT.

14. The method as described in claim 9, characterized in that, The indication information is carried through downlink control information (DCI).

15. The method as described in claim 14, characterized in that, The terminal is a narrowband Internet of Things (NB-IoT) terminal, and the indication information is carried by a portion of the following bits in the DCI: new data indication field, hybrid automatic repeat request-acknowledge (HARQ-ACK) resource field.

16. The method according to any one of claims 9-15, characterized in that, The method further includes: The indication information is descrambled using the Resource Associated Radio Network Temporary Identifier (RNTI) used by CB Msg3.

17. A network device, characterized in that, include: The transceiver module is used to send indication information when a message Msg3 transmission conflict based on contention CB is determined, wherein the indication information is used to instruct the terminal to fall back to any of the following: random access channel RACH procedure, early data transmission EDT based on RACH.

18. A terminal, characterized in that, include: The transceiver module is used to receive indication information, wherein the indication information is used to instruct the terminal to fall back to any of the following: the Random Access Channel (RACH) procedure, or the Early Data Transmission (EDT) based on RACH; the indication information is sent by the network device when it determines that there is a transmission conflict of message Msg3 based on contention CB.

19. A communication device, characterized in that, The communication device is used to perform the method according to any one of claims 1 to 8, 9 to 16.

20. A communication system, characterized in that, The device includes a terminal and a network device, wherein the terminal is configured to implement the method of any one of claims 9 to 16, and the network device is configured to implement the method of any one of claims 1 to 8.

21. A storage medium storing instructions, characterized in that, When the instructions are executed on a communication device, the communication device performs the method as described in any one of claims 1 to 8, 9 to 16.

22. 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 the communication device, it implements the method of any one of claims 1 to 8 and 9 to 16.

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