Random access method and apparatus, and user equipment, base station and storage medium

Abstract

Disclosed in the present application are a random access method and apparatus, and a user equipment, a base station and a storage medium. The random access method is executed by a user equipment. The method comprises: sending indication information, wherein the indication information is used for indicating a capability and / or requirement of a user equipment, the capability and / or requirement comprises a capability of and / or requirement for receiving a repeated PDSCH, and the PDSCH is used for carrying Msg4 of a random access process. In the technical solution, a UE sends indication information, which enables a base station to determine whether the UE has a capability of and / or requirement for receiving a repeated Msg4 PDSCH, and then can transmit the PDSCH in an appropriate manner, thereby improving the success rate and reliability of transmitting Msg4.

Description

A random access method, apparatus, user equipment, base station, and storage medium Technical Field

[0001] This application relates to the field of communication technology, and in particular to a random access method, apparatus, user equipment, base station, and storage medium. Background Technology

[0002] Although 5G has begun commercial use, its coverage in remote ocean and land areas is limited by geographical conditions and business models. To overcome these terrain limitations, integrating satellite communication with terrestrial networks to create a seamless global, integrated air-sea-ground network has become a research hotspot in academia and industry. International organizations such as 3GPP and ITU have established working groups to conduct standardization research on satellite-terrestrial integration. Among these, the 3GPP project on Non-terrestrial Networks (NTN) focuses on integrating satellite communication with 5G, addressing key issues in New Radio (NR) support for NTN. Its standardization work will lay the technological foundation for 6G satellite-terrestrial integration research. Future integrated air-space-ground networks will primarily focus on deep integration, combining diverse communication platforms to provide broader and more diversified communication services.

[0003] In existing technical research, for NTN networks, non-terrestrial base stations mounted on satellites or other carriers have limited signal coverage due to their distance from the ground, thus requiring downlink coverage enhancement. For the Random Access (RA) procedure, the collision or contention resolution message (Msg4) can be transmitted via the Physical Downlink Shared Channel (PDSCH). When enhancing the transmission of the Msg4 PDSCH, the UE's receiving capability must be considered, employing an appropriate transmission method to increase the UE's chances or probability of successfully receiving the Msg4 PDSCH.

[0004] However, since the base station is unaware of the UE's receiving capabilities, it may enhance the transmission of the Msg4 PDSCH even when the UE lacks the capability to receive the enhanced Msg4 PDSCH or has a weak capability, wasting unnecessary resources and potentially causing the UE to fail to receive the Msg4 PDSCH correctly. Alternatively, even when the UE has the capability to receive the enhanced Msg4 PDSCH or has a strong capability, it may not enhance the transmission of the Msg4 PDSCH, leading to the UE's failure to receive Msg4. Summary of the Invention

[0005] To address the aforementioned problem that base stations cannot determine whether a UE is capable of or needs to receive enhanced Msg4 PDSCH, this application provides a random access method, apparatus, user equipment, base station, and storage medium.

[0006] This application provides a random access method, which is executed by a user equipment and includes:

[0007] Send indication information, which is used to indicate the capabilities and / or requirements of the user equipment;

[0008] The capabilities and / or requirements include the capability and / or requirement to receive repeated PDSCHs.

[0009] The PDSCH is used to carry Msg4 in the random access procedure.

[0010] This application provides a random access method, including:

[0011] Receive instruction information,

[0012] The indication information is used to indicate the capabilities and / or requirements of the user equipment;

[0013] The capabilities and / or requirements include the capability and / or requirement to receive repeated Physical Downlink Shared Channel (PDSCH);

[0014] The PDSCH is used to carry Msg4 in the random access procedure.

[0015] This application provides a random access device, including:

[0016] An information sending module is used to send indication information, which is used to indicate the capabilities and / or requirements of the user equipment;

[0017] The capabilities and / or requirements include the capability and / or requirement to receive repeated PDSCHs.

[0018] The PDSCH is used to carry Msg4 in the random access procedure.

[0019] This application provides a random access device, including:

[0020] The information receiving module is used to receive instruction information.

[0021] The indication information is used to indicate the capabilities and / or requirements of the user equipment;

[0022] The capabilities and / or requirements include the capability and / or requirement to receive repeated Physical Downlink Shared Channel (PDSCH);

[0023] The PDSCH is used to carry Msg4 in the random access procedure.

[0024] This application provides a network device, including:

[0025] One or more processors;

[0026] Storage device for storing one or more programs;

[0027] When the one or more programs are executed by the one or more processors, the one or more processors implement the random access method described above.

[0028] This application provides a user equipment, including:

[0029] One or more processors;

[0030] Storage device for storing one or more programs;

[0031] When the one or more programs are executed by the one or more processors, the one or more processors implement the random access method described above.

[0032] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described random access method.

[0033] This application provides a random access method, apparatus, user equipment (UE), base station, and storage medium. The random access method is executed by the UE and includes: sending indication information, the indication information indicating the UE's capabilities and / or requirements; the capabilities and / or requirements including the capability and / or requirement to receive repeated Msg4 PDSCHs; the PDSCH being used to carry Msg4 in the random access procedure. In this technical solution, by sending the indication information, the UE can enable the base station to determine whether the UE has the capability or needs to receive repeated Msg4 PDSCHs, thereby allowing the base station to adopt an appropriate method to transmit the PDSCH, improving the success rate and reliability of Msg4 transmission. Attached Figure Description

[0034] The features, advantages, and aspects of the embodiments disclosed in this application will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0035] Figure 1 is a schematic diagram of a 4-step random access method provided in an embodiment of this application;

[0036] Figure 2 is a flowchart of a random access method provided in an embodiment of this application;

[0037] Figure 3 is a schematic diagram of a MAC subheader format provided in an embodiment of this application;

[0038] Figure 4 is a flowchart of another random access method provided in an embodiment of this application;

[0039] Figure 5 is a structural schematic diagram of a random access device provided in an embodiment of this application;

[0040] Figure 6 is a schematic diagram of another random access device provided in an embodiment of this application. Detailed Implementation

[0041] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present application, not the entire structure.

[0042] Before discussing the exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the steps as sequential processes, many of these steps can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the steps can be rearranged. The process can be terminated when its operation is complete, but may also have additional steps not included in the figures. The process can correspond to a method, function, procedure, subroutine, subroutine, etc.

[0043] Furthermore, the embodiments and features described in this application may be combined with each other, unless otherwise specified.

[0044] In existing technologies, the random access (RA) procedure is one of the key steps in establishing a connection between the UE and the network. The RA procedure plays a crucial role in scenarios such as initial access, connection re-establishment, data transmission, and handover. Taking 5G as an example, two types of random access procedures are supported: 4-step RA and 2-step RA. Both types support both contention-based random access (CBRA) and contention-free random access (CFRA).

[0045] Figure 1 is a schematic diagram of a 4-step RA provided in one embodiment. As shown in Figure 1, the 4-step RA includes MSG1 to MSG4. MSG1 is a preamble transmitted on the Physical Random Access Channel (PRACH), and the UE monitors the response from the network within a configured window. For CBRA, after receiving the random access response, the UE uses the resources granted by the uplink (UL) to send Msg3 and monitors the contention resolution; if contention resolution is unsuccessful, the UE will return to retransmit MSG1. For CFRA, the network allocates a dedicated preamble for MSG1 transmission, and the UE ends the RA process after receiving the response.

[0046] The random access process typically includes the following steps:

[0047] S1. Select SSB: The UE selects a synchronization signal and PBCH block that meet the Reference Signal Receiving Power (RSRP) threshold requirement. If the requirement is not met, it can arbitrarily select an SSB.

[0048] S2. Select a preamble sequence (Preamble Index): Select a preamble sequence based on the size of MSG3 and path loss;

[0049] S3. Preamble Transmission: The UE transmits the Msg1 preamble on the PRACH.

[0050] S4. Monitoring Response: The UE monitors responses from the network within a configured window.

[0051] S5. Sending Msg3: For CBRA, after receiving the random access response, the UE uses the resources granted by the UL to send MSG3 and monitors the contention resolution status; for CFRA, the network allocates a dedicated preamble for Msg1 transmission, and the UE ends the RA process after receiving the response.

[0052] S6. Contention resolution: If contention resolution fails, the UE will return to retransmit Msg1.

[0053] In this application, the downlink transmission enhancement of Msg4 in the RA process is mainly considered by the base station to send repeated Msg4 PDSCH (Repetition Msg4 PDSCH). That is, the base station can repeatedly send the same Msg4 PDSCH. It can also be understood that the base station can send Msg4 multiple times through PDSCH, and can scramble the Physical Downlink Control Channel (PDCCH) with scrambling code to indicate the PDSCH.

[0054] However, this enhanced Msg4 PDSCH places requirements on the UE's receiving capability, which can be understood as the ability to receive duplicate Msg4 PDSCH. When the enhancement method involves the base station sending duplicate Msg4 PDSCH, the receiving capability primarily refers to the UE's ability to receive duplicate Msg4 PDSCH. Since the base station does not know whether the UE has the capability and / or needs to receive duplicate Msg4 PDSCH, it cannot adopt an appropriate method to send the Msg4 PDSCH. For example, if the UE does not have the capability and / or does not need to receive duplicate Msg4 PDSCH, but the base station sends duplicate Msg4 PDSCH, it leads to wasted resources, and the UE may only receive one or part of the PDSCH, failing to correctly receive Msg4; conversely, if the UE has the capability and / or needs to receive duplicate Msg4 PDSCH, but the base station does not send duplicate Msg4 PDSCH, such as sending only one PDSCH, it may cause the UE to fail to receive Msg4.

[0055] This application provides a random access method and a method for random access. By sending indication information, the UE can enable the base station to determine whether the UE is capable of or needs to receive duplicate Msg4 PDSCHs, and thus the base station can adopt an appropriate method to transmit the PDSCH. For example, if the UE is unable or does not need to receive duplicate Msg4 PDSCHs, the base station can choose not to send duplicate Msg4 PDSCHs, such as sending only one PDSCH, saving resources. The UE can correctly receive Msg4 by receiving this one PDSCH. Conversely, if the UE is capable or needs to receive duplicate Msg4 PDSCHs, the base station can send duplicate Msg4 PDSCHs, providing the UE with more opportunities to receive them. Based on this, the success rate and reliability of Msg4 transmission can be improved.

[0056] The user equipment (UE) in this application embodiment can be referred to as a terminal, such as a mobile terminal or an in-vehicle terminal. The UE includes any device that provides voice and / or data connectivity to the user, such as wireless terminal devices, mobile terminal devices, device-to-device (D2D) terminal devices, vehicle-to-everything (V2X) terminal devices, machine-to-machine / machine-type communications (M2M / MTC) terminal devices, Internet of Things (IoT) terminal devices, light UE, reduced-capability UE (REDCAP UE), subscriber unit, subscriber station, mobile station, remote station, access point (AP), remote terminal, access terminal, user terminal, user agent, or user device, etc. It can also be user equipment in future communication systems, but this patent is not limited to this.

[0057] The network devices in this application embodiment can be access network devices, core network devices, or servers, etc. Access network devices can be base stations in terrestrial communication networks or base stations in NTN networks. For example, evolved NodeBs (eNBs), next-generation nodes (gNBs) in NR systems, roadside units (RSUs), centralized units (CUs) and distributed units (DUs) in cloud access network systems, and access network devices in future communication systems. Core network devices can be Mobility Management Entities (MMEs), Serving Gateways (SGWs), Packet Data Node Gateways (PGWs), Home Subscriber Servers (HSSs) storing user subscription information, Policy and Charging Rule Functions (PCRFs), etc., and can also be core network devices in future communication systems; this application is not limited to these.

[0058] Figure 2 is a flowchart of a random access method provided in an embodiment of this application. This embodiment is applicable to situations where the UE performs random access. Specifically, the random access method can be executed by a random access device, which can be implemented in software and / or hardware and integrated into the user equipment.

[0059] As shown in Figure 2, the sending method provided in this embodiment of the application can be implemented through the following steps:

[0060] S110. Send indication information, the indication information being used to indicate the capabilities and / or requirements of the user equipment;

[0061] The capabilities and / or requirements include the capability and / or requirement to receive repeated PDSCHs.

[0062] The PDSCH is used to carry Msg4 in the random access procedure.

[0063] In this embodiment, PDSCH can be understood as a PDSCH used to carry Msg4, or it can be represented as Msg4 PDSCH. The indication information can be used to indicate the UE's ability and / or requirement to receive repeated Msg4 PDSCHs. The ability and / or requirement to receive repeated Msg4 PDSCHs can also be understood as the ability and / or requirement to repeatedly receive Msg4 PDSCHs, or as Msg4 PDSCH Repetition Capability / Request. During the process of the base station sending repeated Msg4 PDSCHs, the UE can receive each Msg4 PDSCH at any time or in real time, or it can receive each Msg4 PDSCH after the base station has sent all Msg4 PDSCHs.

[0064] For example, the instruction information may be used to indicate at least one of the following:

[0065] Does the UE have the ability to receive repeated Msg4 PDSCH?

[0066] Does the UE need to receive duplicate Msg4 PDSCH?

[0067] The strength of the UE's ability to receive repeated Msg4 PDSCH;

[0068] The size of the UE's requirement to receive repeated Msg4 PDSCH.

[0069] Correspondingly, for the indication information used to indicate whether the UE has the ability to receive duplicate Msg4 PDSCH, if the UE has the ability to receive duplicate Msg4 PDSCH, the base station can send duplicate Msg4 PDSCH; if the UE does not have the ability to receive duplicate Msg4 PDSCH, the base station can not send duplicate Msg4 PDSCH.

[0070] In cases where the indication information is used to indicate whether the UE needs to receive duplicate Msg4 PDSCH, if the UE needs to receive duplicate Msg4 PDSCH, the base station can send duplicate Msg4 PDSCH; if the UE does not need to receive duplicate Msg4 PDSCH, the base station can choose not to send duplicate Msg4 PDSCH.

[0071] In cases where the indication information is used to indicate the strength of the UE's ability to receive repeated Msg4 PDSCH, if the UE's ability to receive repeated Msg4 PDSCH is strong, such as being able to receive Msg4 PDSCH with a repetition count and / or repetition level greater than a specified threshold, then the base station can send Msg4 PDSCH with a higher repetition count and / or higher repetition level; if the UE's ability to receive repeated Msg4 PDSCH is weak, such as being able to receive Msg4 PDSCH with a repetition count and / or repetition level not exceeding a specified threshold, then the base station can send Msg4 PDSCH with a lower repetition count and / or lower repetition level.

[0072] When the indication information is used to indicate the size of the UE's demand for receiving repeated Msg4 PDSCH, if the UE's demand for receiving repeated Msg4 PDSCH is large, such as needing to receive Msg4 PDSCH with a repetition count and / or repetition level greater than a specified threshold, the base station can send Msg4 PDSCH with a large repetition count and / or a high repetition level; if the UE's demand for receiving repeated Msg4 PDSCH is small, such as needing to receive Msg4 PDSCH with a repetition count and / or a repetition level greater than a specified threshold, the base station can send Msg4 PDSCH with a small repetition count and / or a low repetition level.

[0073] In the random access method of this application embodiment, the base station can clearly define the UE's ability and / or requirement to receive repeated Msg4 PDSCHs. Based on this, it can determine whether to send repeated Msg4 PDSCHs, and / or the number of repetitions and / or the repetition level of the repeated Msg4 PDSCHs. The base station and the UE use an appropriate method to transmit PDSCHs, improving the success rate and reliability of Msg4 transmission.

[0074] It should be noted that, in the embodiments of this application, the case of sending or receiving a single Msg4 PDSCH is mainly used as an example. Sending or receiving a Msg4 PDSCH once can also be understood as sending or receiving one Msg4 PDSCH, that is, the Msg4 PDSCH is not repeated; sending or receiving multiple Msg4 PDSCHs can also be understood as sending or receiving multiple identical Msg4 PDSCHs, that is, the Msg4 PDSCH is repeated.

[0075] In one embodiment, the indication information is carried by at least one of the following messages: Msg3, Non-access Stratum (NAS) message, Radio Resource Control (RRC) layer message, Packet Data Convergence Protocol (PDCP) layer message, Radio Link Control (RLC) layer message, Media Access Control (MAC) layer message, Physical (PHY) layer message, and System Information Block (SIB).

[0076] Taking the case where the indication information is carried by Msg3 as an example, Msg3 can contain indication information or other information, such as the UE's unique identifier. For a UE in the RRC_CONNECTED state, this identifier can be the Cell-Radio Network Temporary Identifier (C-RNTI); for a UE in the RRC_INACTIVE state, this identifier can be the identifier of the upper layer indication.

[0077] In one embodiment, for random access procedures not in the CONNECTED state, Msg3 is mainly configured by higher layers, while for random access procedures in the CONNECTED state, Msg3 mainly includes C-RNTI.

[0078] In one embodiment, the base station and the UE can transmit Msg4 PDSCH once or multiple times. Whether the Msg4 PDSCH is repeated and / or the number of times it is repeated can be flexibly determined based on the UE's ability to receive repeated Msg4 PDSCH. Based on this, the UE can perform one of the following actions according to its ability and / or requirements to receive repeated Msg4 PDSCH:

[0079] 1) Receive the PDSCH used to carry Msg4 (i.e., Msg4 PDSCH), or do not receive duplicate PDSCHs used to carry Msg4. For example, the UE can receive only one Msg4 PDSCH; if the base station sends multiple Msg4 PDSCHs, the UE can receive any one of them.

[0080] 2) Receive repeated PDSCHs used to carry Msg4. For example, the UE can receive at least two Msg4 PDSCHs. If the base station sends X (X is an integer greater than or equal to 2) Msg4 PDSCHs, the UE can receive Y (Y is an integer greater than or equal to 2 and less than or equal to X) Msg4 PDSCHs. During the process of the base station sending X Msg4 PDSCHs, the UE can receive Msg4 PDSCHs in real time or at any time, or it can receive them after the base station has sent X Msg4 PDSCHs.

[0081] 3) Receive the PDSCH for carrying Msg4 with the corresponding repetition level. For example, the UE can receive the corresponding number of Msg4 PDSCHs according to the repetition level. It should be noted that if the repetition level corresponds to the case where the Msg4 PDSCH is not repeated, the UE may not receive the repeated Msg4 PDSCHs.

[0082] 4) Receive the PDSCH used to carry Msg4 with the corresponding number of repetitions. For example, the UE can receive the corresponding number of Msg4 PDSCHs according to the number of repetitions. It should be noted that if the number of repetitions corresponds to the case where the Msg4 PDSCH is not repeated, the UE may not receive the repeated Msg4 PDSCHs.

[0083] In one embodiment, the method further includes one of the following:

[0084] If the user equipment does not have the capability and / or need to receive repeated Msg4 PDSCHs, it may receive the PDSCH used to carry Msg4, or it may not receive repeated PDSCHs used to carry Msg4; for example, if the UE does not have the capability and / or need to receive repeated Msg4 PDSCHs, it may receive only one Msg4 PDSCH; if the base station sends multiple Msg4 PDSCHs, the UE may receive any one of them.

[0085] If the user equipment (UE) has the capability and / or the need to receive repeated Msg4 PDSCHs, it can receive repeated PDSCHs used to carry Msg4. For example, if the UE has the capability and / or the need to receive repeated Msg4 PDSCHs, it can receive at least two Msg4 PDSCHs. If the base station sends X (X is an integer greater than or equal to 2) Msg4 PDSCHs, the UE can receive Y (Y is an integer greater than or equal to 2 and less than or equal to X) Msg4 PDSCHs. During the process of the base station sending X Msg4 PDSCHs, the UE can receive Msg4 PDSCHs in real time or at any time, or it can receive them after the base station has sent X Msg4 PDSCHs.

[0086] If the user equipment has the capability and / or the need to receive repeated Msg4 PDSCHs, it receives PDSCHs for carrying Msg4 with the corresponding repetition level. For example, the repetition level is the total number of identical Msg4 PDSCHs. If the repetition level is 4, the UE can receive 4 Msg4 PDSCHs, which can be received in real time or at any time, or after the base station has sent all Msg4 PDSCHs. If the repetition level is 0, repeated Msg4 PDSCHs can be ignored.

[0087] If the user equipment has the capability and / or the need to receive repeated Msg4 PDSCHs, it receives the corresponding number of repeated Msg4 PDSCHs. For example, the number of repetitions is the total number of identical Msg4 PDSCHs. If the number of repetitions is 4, the UE can receive 4 Msg4 PDSCHs, which can be received in real time or at any time, or after the base station has sent all Msg4 PDSCHs. If the number of repetitions is 0, the UE can not receive repeated Msg4 PDSCHs.

[0088] In one embodiment, the indication information is carried by at least one of the following parts: MAC subheader and MAC control element (CE).

[0089] For example, the MAC subheader can carry indication information to indicate whether the UE has the capability and / or need to receive repeated Msg4 PDSCH; alternatively, the MAC CE can carry indication information to indicate the strength of the UE's capability and / or the magnitude of its need to receive repeated Msg4 PDSCH. In this case, it can also indirectly indicate whether the UE has the capability and / or need to receive repeated Msg4 PDSCH. For example, if the capability is weak to a certain extent and / or the need is small to a certain extent, it can be said that the UE does not have the capability and / or need to receive repeated Msg4 PDSCH. Alternatively, the MAC subheader and MAC CE can carry indication information to jointly indicate whether the UE has the capability and / or need to receive repeated Msg4 PDSCH, as well as the strength of the UE's capability and / or the magnitude of its need to receive repeated Msg4 PDSCH. For example, the MAC subheader indicates whether the UE has the capability and / or need to receive repeated Msg4 PDSCH, and the MAC CE indicates the strength of the capability and / or the magnitude of its need to receive repeated Msg4 PDSCH. Another example is that the MAC subheader indicates the MAC... The purpose of the CE is to indicate the UE's ability and / or requirement to receive repeated Msg4 PDSCHs. The MAC CE indicates the strength of the ability and / or the magnitude of the requirement to receive repeated Msg4 PDSCHs.

[0090] In one embodiment, the indication information is carried by a MAC subheader; the MAC subheader contains at least one of the following fields:

[0091] The Logical Channel Identity (LCID) field is mainly used to indicate the logical channel or the type or padding bits of the corresponding MAC Service Data Unit (SDU).

[0092] The Extended Logical Channel ID (eLCID) field is mainly used to indicate the logical channel corresponding to the corresponding MAC SDU or the type of the corresponding MAC CE;

[0093] The Length (L) field is primarily used to indicate the length of the corresponding MAC SDU or variable-length MAC CE, in bytes.

[0094] The format (F) field is primarily used to indicate the size of the length field;

[0095] The Logical Channel Identifier Extension (LX) field is mainly used to indicate the space used for extended logical channels;

[0096] Reserved field, set to 0.

[0097] MAC subheaders can be aligned to bytes.

[0098] In one embodiment, the indication information is carried by a MAC subheader; the MAC subheader includes: an LCID extended field or a first reserved field; a second reserved field; and an LCID field.

[0099] Figure 3 is a schematic diagram of a MAC subheader format provided in one embodiment. In this embodiment, the reserved field (reserved bits) in the MAC subheader can be used to carry indication information. As shown in Figure 3, the indication information is carried by the MAC subheader and can be used to indicate whether the UE has the capability and / or requirement to receive repeated Msg4 PDSCH. The MAC subheader may contain the following three parts:

[0100] The LX field or the first reserved field (R) can be used to indicate the use of space for extended logical channels, and the R field can be reserved, or can be used to indicate the UE's ability and / or requirement to receive repeated Msg4 PDSCH.

[0101] The second reservation field (R) can be used for reservation, or it can be used to indicate the UE's ability and / or requirement to receive duplicate Msg4 PDSCH, or it can be used for reservation or to indicate the UE's ability and / or requirement to receive duplicate Msg4 PDSCH;

[0102] The LCID field can be used to indicate the logical channel corresponding to the corresponding MAC SDU or the type or padding bits of the corresponding MAC CE;

[0103] The first or second reserved field is used to indicate when a reservation is made, and its value can be 0, empty, or other values.

[0104] The first or second reserved field can be 0 or 1 when used to indicate the UE's ability and / or requirement to receive repeated Msg4 PDSCH.

[0105] The first reserved field and the second reserved field can use different or the same reserved field values.

[0106] For example, when the first reserved field is used to indicate reservation and the second reserved field is used to indicate the UE's ability and / or requirement to receive duplicate Msg4 PDSCH, and when it indicates that the UE has the ability and / or requirement to receive duplicate Msg4 PDSCH, the first reserved field is 0, empty, or other values, and the second reserved field is the first value.

[0107] For example, when the first reserved field is used to indicate reservation and the second reserved field is used to indicate the UE's ability and / or requirement to receive duplicate Msg4 PDSCH, and when it indicates that the UE does not have the ability and / or requirement to receive duplicate Msg4 PDSCH, the first reserved field is 0, empty, or other values, and the second reserved field is the second value.

[0108] For example, when the first reserved field is used to indicate the UE's ability and / or requirement to receive duplicate Msg4 PDSCH, and indicates that the UE has the ability and / or requirement to receive duplicate Msg4 PDSCH, when the second reserved field is used for reservation, the first reserved field takes the first value, and the second reserved field is 0, empty, or other values.

[0109] For example, when the first reserved field is used to indicate the UE's ability and / or requirement to receive duplicate Msg4 PDSCH, and to indicate that the UE does not have the ability and / or requirement to receive duplicate Msg4 PDSCH, when the second reserved field is used for reservation, the first reserved field takes the second value, and the second reserved field is 0, empty, or other cases.

[0110] For example, when the first reserved field is used to indicate reservation, and the second reserved field is used to reserve, the first reserved field may be 0, empty, or other values, and the second reserved field may be 0, empty, or other values. In this case, whether the information carrying the indication information includes the indication information can be used to indicate whether the UE has the ability and / or need to receive repeated Msg4 PDSCH.

[0111] For example, when the first reserved field is used to indicate the UE's ability and / or requirement to receive duplicate Msg4 PDSCH, and indicates that the UE does not have the ability and / or requirement to receive duplicate Msg4 PDSCH, when the second reserved field is used to indicate the UE's ability and / or requirement to receive duplicate Msg4 PDSCH, and indicates that the UE does not have the ability and / or requirement to receive duplicate Msg4 PDSCH, the first reserved field takes the second value, and the second reserved field takes the second value.

[0112] For example, when the first reserved field is used to indicate the UE's ability and / or requirement to receive duplicate Msg4 PDSCH, and indicates that the UE has the ability and / or requirement to receive duplicate Msg4 PDSCH, when the second reserved field is used to indicate the UE's ability and / or requirement to receive duplicate Msg4 PDSCH, the first reserved field takes the first value, and the second reserved field takes the first value.

[0113] In one embodiment, the indication information is carried by the MAC subheader and can be used to indicate whether the UE has the capability and / or requirement to receive duplicate Msg4 PDSCHs. The MAC subheader includes a reserved field; the value of the reserved field is a first value, indicating that the user equipment has the capability and / or requirement to receive duplicate Msg4 PDSCHs; and / or, the value of the reserved field is a second value, indicating that the user equipment does not have the capability and / or requirement to receive duplicate Msg4 PDSCHs.

[0114] For example, the first value is 1. If the value of the reserved field in the MAC subheading is 1, it indicates that the UE has the capability and / or requirement to receive duplicate Msg4 PDSCH. It is understood that if the value of the reserved field in the MAC subheading is not 1, such as being 0, empty, or in other cases, it indicates that the UE does not have the capability and / or requirement to receive duplicate Msg4 PDSCH.

[0115] For example, the second value is 0. If the value of the reserved field in the MAC subheading is 0, it indicates that the UE does not have the capability and / or need to receive duplicate Msg4 PDSCHs. It is understood that if the value of the reserved field in the MAC subheading is not 0, such as being 1, empty, or in other cases, it indicates that the UE has the capability and / or need to receive duplicate Msg4 PDSCHs.

[0116] It should be noted that the first value and the second value are different values. In this embodiment, the values ​​of the first and second values ​​are not specifically limited. For example, the first value can also be other values, such as 0. That is, if the value of the reserved field in the MAC subheading is 0, it indicates that the UE has the capability and / or requirement to receive duplicate Msg4 PDSCH. The second value can also be other values, such as 1. That is, if the value of the reserved field in the MAC subheading is 1, it indicates that the UE does not have the capability and / or requirement to receive duplicate Msg4 PDSCH.

[0117] In one embodiment, the indication information is carried by a MAC subheader and a MAC CE, wherein the MAC subheader contains an LCID field; the LCID field is used to indicate that the MAC CE is for indicating the UE's ability and / or requirement to receive repeated Msg4 PDSCH.

[0118] The MAC subheader indicates whether the UE has the capability and / or requirement to receive repeated Msg4 PDSCHs. The LCID field in the MAC subheader indicates the purpose of the MAC CE. For example, the MAC CE can indicate the UE's capability and / or requirement to receive repeated Msg4 PDSCHs, such as the strength of the capability and / or the magnitude of the requirement, or the repetition level and / or the number of repetitions. The LCID field can have any value, and different values ​​can indicate different purposes. The format of the MAC subheader can be seen in Figure 3.

[0119] In one embodiment, the indication information is carried by a MAC subheader and a MAC CE. The MAC subheader includes an LCID field; the LCID field indicates whether the MAC CE is for the UE to receive repeated Msg4 PDSCH and / or requires it. The value of the LCID field is a reserved value.

[0120] The reserved value can range from 64 to 282. The format of the MAC header can be seen in Figure 3. Taking a reserved value of 64 as an example, when the LCID field in the MAC header is 64, it indicates that the MAC CE is used to indicate the UE's ability and / or requirement to receive repeated Msg4 PDSCH.

[0121] It should be noted that the range of the reserved value can also be 64 to N, where N can take any value.

[0122] In one embodiment, the indication information is carried by a MAC CE; the MAC CE is used to indicate at least one of the following:

[0123] Does the UE have the capability and / or need to receive repeated Msg4 PDSCH?

[0124] Repeat level of Msg4 PDSCH;

[0125] The number of repetitions of Msg4 PDSCH.

[0126] For example, MAC CE can be used to indicate that the UE has the capability and / or need to receive duplicate Msg4 PDSCH, so that the base station can send duplicate Msg4 PDSCH and the UE can receive duplicate Msg4 PDSCH; or MAC CE can be used to indicate that the UE does not have the capability and / or need to receive duplicate Msg4 PDSCH, so that the base station does not need to send duplicate Msg4 PDSCH and the UE does not need to receive duplicate Msg4 PDSCH.

[0127] For example, MAC CE can be used to indicate the repetition level of Msg4 PDSCH, so that the base station can send Msg4 PDSCH with the corresponding repetition level, and the UE can receive Msg4 PDSCH with the corresponding repetition level. It should be noted that if the repetition level corresponds to the case where Msg4 PDSCH is not repeated, it can indirectly indicate that the UE does not have the ability and / or need to receive repeated Msg4 PDSCH, and the base station may not send repeated Msg4 PDSCH, and the UE may not receive repeated Msg4 PDSCH. If the repetition level corresponds to the case where Msg4 PDSCH is repeated, it can indirectly indicate that the UE has the ability and / or need to receive repeated Msg4 PDSCH.

[0128] For example, MAC CE can be used to indicate the number of times Msg4 PDSCH is repeated, so that the base station can send Msg4 PDSCH with the corresponding number of repetitions, and the UE can receive Msg4 PDSCH with the corresponding number of repetitions. It should be noted that if the number of repetitions corresponds to the case where Msg4 PDSCH is not repeated, it can indirectly indicate that the UE does not have the ability and / or need to receive repeated Msg4 PDSCH, and the base station can choose not to send repeated Msg4 PDSCH, and the UE can choose not to receive repeated Msg4 PDSCH. If the number of repetitions corresponds to the case where Msg4 PDSCH is repeated, it can indirectly indicate that the UE has the ability and / or need to receive repeated Msg4 PDSCH.

[0129] For example, MAC CE can be used to indicate whether the UE has the ability and / or need to receive repeated Msg4 PDSCH, and also to indicate at least one of the repetition level and repetition number of Msg4 PDSCH. In this case, if the UE has the ability and / or need to receive repeated Msg4 PDSCH, the repetition level and / or repetition number will not usually correspond to the case where Msg4 PDSCH is not repeated.

[0130] It should be noted that the repetition count can be understood as the total number of identical Msg4 PDSCHs. For example, if a total of 4 identical Msg4 PDSCHs are sent, the repetition count is 4. If the repetition count is 1 or 0, it can also be understood as the Msg4 PDSCHs not being repeated. The repetition count can also be understood as the number of times the identical Msg4 PDSCH is repeated. For example, if a total of 4 identical Msg4 PDSCHs are sent, it can be understood as one Msg4 PDSCH being repeated 3 times, and the repetition count can be 3. If the repetition count is 0, it can also be understood as the Msg4 PDSCHs not being repeated.

[0131] The repetition level can be understood as the total number of identical Msg4 PDSCHs. For example, if four identical Msg4 PDSCHs are sent, the repetition level can be 4. If the repetition level is 1 or 0, it can also be understood as no repetition of Msg4 PDSCHs. The repetition level can also be understood as the number of times the identical Msg4 PDSCHs are repeated. For example, if four identical Msg4 PDSCHs are sent, the repetition level can be 3. If the repetition level is 0, it can also be understood as no repetition of Msg4 PDSCHs. The repetition level can also be set according to other rules. For example, the repetition level can be set from low to high as level 1, level 2, level 3, ... N times. The higher the repetition level, the more times it is repeated. A lower repetition level (such as level 1) can mean no repetition.

[0132] In one embodiment, if the message carrying indication information contains indication information, the user equipment has the capability and / or the requirement; and / or, if the message carrying indication information does not contain indication information, the user equipment does not have the capability and / or the requirement.

[0133] In this embodiment, whether the UE has the capability and / or need to receive duplicate Msg4 PDSCHs can be indicated by whether the message carrying the indication information contains indication information. Taking the case where the indication information is carried by Msg3 as an example, if Msg3 contains indication information (regardless of the value of the indication information), it indicates that the UE has the capability and / or need to receive duplicate Msg4 PDSCHs; if Msg3 does not contain indication information, it indicates that the UE does not have the capability and / or need to receive duplicate Msg4 PDSCHs.

[0134] In one embodiment, the indication information is carried by a MAC subheader and / or a MAC CE; if the message carrying the indication information contains a MAC subheader and / or a MAC CE, then the user equipment has the capability and / or requirement; and / or, if the message carrying the indication information does not contain a MAC subheader and / or a MAC CE, then the user equipment does not have the capability and / or requirement.

[0135] In this embodiment, the indication information can be carried by the MAC subheader and / or MAC CE. Whether the message carrying the indication information contains the MAC subheader and / or MAC CE indicates whether the UE has the capability and / or need to receive duplicate Msg4 PDSCH. Taking the case where the indication information is carried by Msg3 as an example, if Msg3 contains the MAC subheader and / or MAC CE (regardless of the value of the corresponding field in the MAC subheader and / or MAC CE), it indicates that the UE has the capability and / or need to receive duplicate Msg4 PDSCH; if Msg3 does not contain the MAC subheader and / or MAC CE, it indicates that the UE does not have the capability and / or need to receive duplicate Msg4 PDSCH.

[0136] The random access method of this application embodiment is illustrated below with some examples.

[0137] As an example, the UE can send an indication message to the UE to indicate whether the UE has the capability and / or requirement to receive repeated Msg4 PDSCH; wherein the indication message can be carried by the MAC subheader.

[0138] Optionally, the MAC subheader may contain at least one of the following fields: LCID; eLCID; L; F; LX; R.

[0139] Optionally, the MAC subheader includes the following fields: LX or first reserved field; second reserved field; LCID, see Figure 3 for details.

[0140] Optionally, the MAC subheader includes a reserved field, which takes the first value (e.g., 1) to indicate that the user equipment has the capability and / or requirement to receive duplicate Msg4 PDSCH; and / or, the reserved field takes the second value (e.g., 0) to indicate that the user equipment does not have the capability and / or requirement to receive duplicate Msg4 PDSCH.

[0141] As an example, the UE can send an indication message to the UE to indicate whether the UE has the capability and / or need to receive repeated Msg4 PDSCH; the indication message can be carried by the MAC CE.

[0142] Optionally, MAC CE can be used to indicate at least one of the following:

[0143] Does the user equipment have the capability and / or need to receive repeated Msg4 PDSCH?

[0144] The repetition level of the physical downlink shared channel;

[0145] The number of repetitions of the physical downlink shared channel.

[0146] It is understood that when the indication information is carried by the MAC CE, the MAC subheader may contain at least one of the following fields: LCID; eLCID; L; F; LX; R. Alternatively, the MAC subheader may contain the following fields: LX or a first reserved field; a second reserved field; LCID, as shown in Figure 3.

[0147] Optionally, the LCID field in the MAC subheader can be used to indicate whether the MAC CE is for indicating the user equipment's ability and / or requirement to receive repeated Msg4 PDSCH.

[0148] Optionally, the LCID field in the MAC subheader can be a reserved value.

[0149] As an example, the UE can send an indication message to itself to indicate whether the UE has the capability and / or need to receive repeated Msg4 PDSCHs; the indication message can be carried by a MAC subheader and a MAC CE. The MAC subheader can be used to indicate whether the UE has the capability and / or need to receive repeated Msg4 PDSCHs, and the MAC CE can be used to indicate the weight level and / or number of repetitions of the Msg4 PDSCHs that the UE can receive.

[0150] Optionally, the MAC subheader may contain at least one of the following fields: LCID; eLCID; L; F; LX; R.

[0151] Optionally, the MAC subheader may include the following fields: LX or first reserved field; second reserved field; LCID. See Figure 3 for details in this case.

[0152] Optionally, the LCID field in the MAC subheader can be used to indicate whether the MAC CE is for indicating the user equipment's ability and / or requirement to receive repeated Msg4 PDSCH.

[0153] Optionally, the LCID field in the MAC subheader can be a reserved value.

[0154] Optionally, MAC CE can be used to indicate at least one of the following:

[0155] Does the user equipment have the aforementioned capabilities and / or requirements?

[0156] The repetition level of the physical downlink shared channel;

[0157] The number of repetitions of the physical downlink shared channel.

[0158] Figure 4 is a flowchart of a random access method provided in an embodiment of this application. This embodiment is applicable to the case of UE random access. Specifically, the random access method can be executed by a random access device, which can be implemented by software and / or hardware and integrated into network-side equipment such as a base station. It should be noted that details not described in detail in this embodiment can be found in any of the above embodiments.

[0159] As shown in Figure 4, the method specifically includes the following steps:

[0160] S210. Receive indication information, the indication information being used to indicate the capabilities and / or requirements of the user equipment; the capabilities and / or requirements include the capability and / or requirement to receive repeated PDSCHs; the PDSCHs are used to carry Msg4 of the random access procedure.

[0161] In this embodiment, PDSCH can be understood as the PDSCH used to carry Msg4, or it can be represented as Msg4 PDSCH. The indication information can be used to indicate the UE's ability and / or requirement to receive repeated Msg4 PDSCH. The ability and / or requirement to receive repeated Msg4 PDSCH can also be understood as the ability and / or requirement to repeatedly receive Msg4 PDSCH, or Msg4 PDSCH Repetition Capability and / or Request. By receiving the indication information, the base station can determine whether the UE has the ability and / or requirement to receive repeated Msg4 PDSCH, and / or determine the strength of the UE's ability and / or the magnitude of its requirement, etc. Based on this, it can determine whether to send repeated Msg4 PDSCH, and / or the repetition level and / or number of repetitions of the Msg4 PDSCH, etc. On this basis, the base station and the UE use an appropriate method to transmit PDSCH, improving the success rate and reliability of Msg4 transmission.

[0162] In one embodiment, the indication information is carried by at least one of the following messages: Msg3, NAS layer message, RRC layer message, PDCP layer message, RLC layer message, MAC layer message, PHY layer message, and SIB.

[0163] In one embodiment, the method further includes: performing one of the following based on the UE's ability and / or requirement to receive repeated Msg4 PDSCH:

[0164] 1) Send a PDSCH to the user equipment to carry Msg4, or do not send repeated PDSCHs to the user equipment to carry Msg4. For example, the base station may send only one Msg4 PDSCH.

[0165] 2) Sending repeated PDSCHs to the user equipment to carry Msg4. For example, the base station may send X (X is an integer greater than or equal to 2) Msg4 PDSCHs, where X can be determined based on the UE's ability and / or requirement to receive repeated Msg4 PDSCHs.

[0166] For example, if the UE can receive Z (Z is any non-negative integer) Msg4 PDSCHs, then X can be an integer less than or equal to Z. That is, the number of Msg4 PDSCHs sent by the base station should not exceed the number of Msg4 PDSCHs that the UE can receive, in order to avoid wasting resources and to avoid UE reception failure.

[0167] For example, if the UE needs to receive Z' (Z' is any non-negative integer) Msg4 PDSCHs, then X can be an integer greater than or equal to Z'. That is, the number of Msg4 PDSCHs sent by the base station should not be less than the number of Msg4 PDSCHs that the UE needs to receive, so as to meet the UE's requirement to repeatedly receive Msg4 PDSCHs.

[0168] 3) Send the PDSCH for carrying Msg4 with the corresponding repetition level to the user equipment. For example, the base station can send the Msg4 PDSCH a corresponding number of times according to the repetition level. It should be noted that if the repetition level corresponds to the case where the Msg4 PDSCH is not repeated, the base station may not send repeated Msg4 PDSCH.

[0169] 4) Send the PDSCH for carrying Msg4 to the user equipment with the corresponding number of repetitions. For example, the base station can send the Msg4 PDSCH the corresponding number of times according to the number of repetitions. It should be noted that if the number of repetitions corresponds to the case where the Msg4 PDSCH is not repeated, the base station may not send the repeated Msg4 PDSCH.

[0170] In one embodiment, the method further includes one of the following:

[0171] If the user equipment does not have the capability and / or need to receive repeated Msg4 PDSCH, send a PDSCH for carrying Msg4 to the user equipment, or do not send repeated PDSCH for carrying Msg4 to the user equipment. For example, the base station may send only one Msg4 PDSCH.

[0172] If the user equipment has the capability and / or the need to receive repeated Msg4 PDSCH, the base station sends repeated PDSCHs for carrying Msg4 to the user equipment. For example, the base station may send X (X is an integer greater than or equal to 2) Msg4 PDSCHs, where X can be determined according to the UE's capability and / or need to receive repeated Msg4 PDSCHs.

[0173] If the user equipment has the capability and / or the need to receive repeated Msg4 PDSCHs, send a PDSCH of the corresponding repetition level to the user equipment to carry Msg4.

[0174] If the user equipment has the capability and / or the need to receive repeated Msg4 PDSCHs, send the corresponding number of repeated PDSCHs for carrying Msg4 to the user equipment.

[0175] In one embodiment, the indication information includes at least one of the following parts: MAC subheader and MAC element.

[0176] In one embodiment, the indication information is carried by a MAC subheader; the MAC subheader includes at least one of the following fields: logical channel identifier field; extended logical channel identifier field; length field; format field; logical channel identifier extension field; and reserved field.

[0177] In one embodiment, the indication information is carried by a MAC subheader; the MAC subheader includes: an LCID extended field or a first reserved field; a second reserved field; and a logical channel identifier field.

[0178] In one embodiment, the indication information is carried by a MAC subheader; the MAC subheader includes a reserved field; the value of the reserved field is a first value, indicating that the user equipment has the capability or the requirement; and / or, the value of the reserved field is a second value, indicating that the user equipment does not have the capability or the requirement.

[0179] In one embodiment, the indication information is carried by a MAC subheader and a MAC CE; the MAC subheader includes a logical channel identifier field; the logical channel identifier field is used to indicate that the MAC CE is used to indicate the capabilities and / or requirements of the user equipment.

[0180] In one embodiment, the value of the logical channel identifier field is a reserved value.

[0181] In one embodiment, the indication information is carried by a MAC CE;

[0182] The MAC CE is used to indicate at least one of the following:

[0183] Does the user equipment have the aforementioned capabilities and / or requirements?

[0184] The repetition level of the physical downlink shared channel;

[0185] The number of repetitions of the physical downlink shared channel.

[0186] In one embodiment, if the message carrying the indication information contains the indication information, then the user equipment has the capability and / or the requirement; and / or, if the message carrying the indication information does not contain the indication information, then the user equipment does not have the capability and / or the requirement.

[0187] In one embodiment, the indication information is carried by a MAC subheader and / or a MAC CE;

[0188] If the message carrying the indication information contains the MAC subheader and / or the MAC CE, then the user equipment has the capability and / or the requirement; and / or,

[0189] If the message carrying the indication information does not contain the MAC subheader and / or the MAC CE, then the user equipment does not have the capability and / or the requirement.

[0190] The main idea of ​​the random access method in this application is to add indication information to Msg3 during the random access process, so that the network side can clearly determine whether the UE has the ability and / or need to receive repeated Msg4 PDSCH, thereby avoiding the UE's failure to receive Msg4 and / or the waste of transmission resources.

[0191] The random access method in this application introduces indication information to indicate whether the UE has the capability or requirement to receive repeated Msg4 PDSCH (i.e., Msg4 PDSCH Repetition Capability / Request).

[0192] Optionally, the indication information can be carried by Msg3 during the random access procedure, or it can be carried by NAS / RRC / PDCP / RLC / MAC / PHY layer messages.

[0193] Optionally, Msg4 PDSCH Repetition can be introduced, meaning that repeated Msg4 PDSCHs can be transmitted between the base station and the UE.

[0194] Optionally, the instruction information may include the MAC Subheader and / or MAC CE.

[0195] Optionally, the MAC subheader contains at least one of the following fields:

[0196] LCID: Primarily used to indicate the logical channel or type of the corresponding MAC Service Data Unit (SDU) or padding bits;

[0197] eLCID: Primarily used to indicate the logical channel corresponding to the corresponding MAC SDU or the type of the corresponding MAC CE;

[0198] L: Primarily used to indicate the length of the corresponding MAC SDU or variable-length MAC CE, in bytes;

[0199] F: Primarily used to indicate the size of a length field;

[0200] LX: Primarily used to indicate the use of space in extended logical channels;

[0201] R: Set to 0.

[0202] MAC subheaders can be aligned to bytes.

[0203] Optionally, the format of the MAC Subheader can be seen in Figure 3, using a reserved field (reserved bits) in the MAC subheader to carry indication information.

[0204] Optionally, different values ​​of LCID can indicate different purposes of MAC CE. When the LCID value is a certain Reserved value, it can indicate whether the purpose of MAC CE is whether the UE has the ability and / or need to receive repeated Msg4 PDSCH.

[0205] Taking the reserved value of 64 as an example, Table 1 shows the LCID value of the Uplink Shared Channel (UL-SCH), and Table 2 shows the eLCID value of an octet of UL-SCH.

[0206] Table 1. Values ​​of LCID for UL-SCH

[0207] Table 2. Values ​​of an octet of the eLCID in UL-SCH

[0208] In fact, LCID can also take other values ​​to indicate whether the corresponding MAC CE is used to indicate whether the UE has the ability and / or need to receive repeated Msg4 PDSCH.

[0209] Optionally, it can indicate whether the UE sending the indication information has the capability or requirement to receive a repetitive Msg4 PDSCH (Random Access Procedure Msg4 PDSCH repetition capability / request), which can be achieved in the following ways:

[0210] Method 1: This can be indicated by the R field in the MAC subheader. For example, an R field value of 1 indicates that Msg4 PDSCH Repetition Capability / Request is present, while a value of 0 indicates that Msg4 PDSCH repetition capability / request is not present. Alternatively, an R field value of 0 indicates that Msg4 PDSCH Repetition Capability / Request is present, while a value of 1 indicates that Msg4 PDSCH Repetition Capability / Request is not present. For Method 1, MAC CE may or may not exist.

[0211] Method 2: The presence of indication information can be used in Msg3. For example, the presence of a MAC subheader and / or MAC CE in Msg3 indicates whether a Msg4 PDSCH Repetition Capability / Request is present. Specifically, if Msg3 contains a MAC subheader and / or MAC CE, it means a Msg4 PDSCH Repetition Capability / Request is present; if Msg3 does not contain a MAC subheader and / or MAC CE, it means a Msg4 PDSCH Repetition Capability / Request is not present. As an example, the presence of a MAC subheader in Msg3 can be used to indicate whether a Msg4 PDSCH Repetition Capability / Request is present.

[0212] Method 3: MAC CE can be used to indicate whether there is a Msg4 PDSCH Repetition Capability / Request, and / or the level or number of Msg4 PDSCH Repetitions.

[0213] Figure 5 is a structural schematic diagram of a random access device provided in an embodiment of this application. As shown in Figure 5, the random access device provided in this embodiment includes:

[0214] Send indication information, which is used to indicate the capabilities and / or requirements of the user equipment;

[0215] The capabilities and / or requirements include the capability and / or requirement to receive repeated Physical Downlink Shared Channel (PDSCH);

[0216] The physical downlink shared channel is used to carry Msg4 for the random access procedure.

[0217] In one embodiment, the indication information is carried by at least one of the following messages: Msg3, NAS message, RRC layer message, PDCP layer message, RLC layer message, MAC layer message, PHY layer message, and SIB.

[0218] In one embodiment, the device further includes an execution module for performing one of the following, depending on the capabilities and / or requirements of the user equipment:

[0219] Receive the PDSCH used to carry Msg4, or do not receive duplicate PDSCHs used to carry Msg4;

[0220] Receive repeated PDSCHs used to carry Msg4;

[0221] Receive the PDSCH of the corresponding repetition level used to carry Msg4;

[0222] Receive the PDSCH used to carry Msg4 for the corresponding number of repetitions.

[0223] In one embodiment, the device further includes a channel receiving module for one of the following:

[0224] If the user equipment does not have the aforementioned capability and / or the aforementioned requirement, receive the PDSCH for carrying Msg4, or do not receive duplicate PDSCHs for carrying Msg4.

[0225] If the user equipment has the aforementioned capability and / or the aforementioned requirement, receive repeated PDSCHs for carrying Msg4;

[0226] If the user equipment has the aforementioned capability and / or the aforementioned requirement, receive the corresponding repetition level of PDSCH for carrying Msg4;

[0227] If the user equipment has the aforementioned capability and / or the aforementioned requirement, it receives the corresponding number of repetitions of the PDSCH for carrying Msg4.

[0228] In one embodiment, the indication information is carried by at least one of the following components: MAC subheader, MAC CE.

[0229] In one embodiment, the indication information is carried by a MAC subheader;

[0230] The MAC subheader includes at least one of the following fields: logical channel identifier field; extended logical channel identifier field; length field; format field; logical channel identifier extended field; reserved field.

[0231] In one embodiment, the indication information is carried by a MAC subheader;

[0232] The MAC subheader contains:

[0233] LCID extended field or first reserved field;

[0234] Second reserved field;

[0235] Logical channel identifier field.

[0236] In one embodiment, the indication information is carried by a MAC subheader; the MAC subheader contains reserved fields;

[0237] The reserved field takes the first value, indicating that the user equipment has the capability or the requirement; and / or,

[0238] The reserved field takes the second value, indicating that the user equipment does not have the capability or the requirement.

[0239] In one embodiment, the indication information is carried by the MAC subheader and the MAC CE;

[0240] The MAC subheader includes a logical channel identifier field; the logical channel identifier field is used to indicate that the MAC CE is used to indicate the capabilities and / or requirements of the user equipment.

[0241] In one embodiment, the value of the logical channel identifier field is a reserved value.

[0242] In one embodiment, the indication information is carried by a MAC CE; the MAC CE is used to indicate at least one of the following:

[0243] Does the user equipment have the aforementioned capabilities and / or requirements?

[0244] The repetition level of the physical downlink shared channel;

[0245] The number of repetitions of the physical downlink shared channel.

[0246] In one embodiment, if the message carrying the indication information contains the indication information, then the user equipment has the capability and / or the requirement; and / or,

[0247] If the message carrying the instruction information does not contain the instruction information, then the user equipment does not have the capability and / or the requirement.

[0248] In one embodiment, the indication information is carried by a MAC subheader and / or a MAC CE;

[0249] If the message carrying the indication information contains the MAC subheader and / or the MAC CE, then the user equipment has the capability and / or the requirement; and / or,

[0250] If the message carrying the indication information does not contain the MAC subheader and / or the MAC CE, then the user equipment does not have the capability and / or the requirement.

[0251] The random access device provided in this application embodiment can be used to execute the random access method provided in any of the above embodiments, and has corresponding functions and beneficial effects.

[0252] Figure 6 is a schematic diagram of a random access device provided in an embodiment of this application. As shown in Figure 6, the random access device provided in this embodiment includes:

[0253] Receiver module 410 is used to receive indication information.

[0254] The indication information is used to indicate the capabilities and / or requirements of the user equipment;

[0255] The capabilities and / or requirements include the capability and / or requirement to receive repeated Physical Downlink Shared Channel (PDSCH);

[0256] The physical downlink shared channel is used to carry Msg4 for the random access procedure.

[0257] In one embodiment, the indication information is carried by at least one of the following messages: Msg3, NAS message, RRC layer message, PDCP layer message, RLC layer message, MAC layer message, PHY layer message, and SIB.

[0258] In one embodiment, the apparatus further includes an execution module configured to perform one of the following, depending on the capabilities and / or requirements of the user equipment:

[0259] Send a PDSCH to the user equipment to carry Msg4, or do not send a duplicate PDSCH to the user equipment to carry Msg4.

[0260] Send repeated PDSCH messages to the user equipment to carry Msg4;

[0261] Send the corresponding repeat level of PDSCH for carrying Msg4 to the user equipment;

[0262] Send the PDSCH for carrying Msg4 to the user equipment a corresponding number of repetitions.

[0263] In one embodiment, the apparatus further includes a channel transmission module for one of the following:

[0264] If the user equipment does not have the aforementioned capability and / or the aforementioned requirement, send a PDSCH for carrying Msg4 to the user equipment, or do not send duplicate PDSCHs for carrying Msg4 to the user equipment.

[0265] If the user equipment has the aforementioned capability and / or the aforementioned requirement, send repeated PDSCH messages to the user equipment for carrying Msg4.

[0266] If the user equipment has the aforementioned capability and / or the aforementioned requirement, send a PDSCH of the corresponding repetition level to the user equipment for carrying Msg4;

[0267] If the user equipment has the aforementioned capability and / or the aforementioned requirement, send the corresponding number of PDSCH messages for carrying Msg4 to the user equipment.

[0268] In one embodiment, the indication information includes at least one of the following parts: MAC subheader and MAC element.

[0269] In one embodiment, the indication information is carried by a MAC subheader;

[0270] The MAC subheader includes at least one of the following fields: logical channel identifier field; extended logical channel identifier field; length field; format field; logical channel identifier extended field; reserved field.

[0271] In one embodiment, the indication information is carried by a MAC subheader;

[0272] The MAC subheader includes: an LCID extended field or a first reserved field; a second reserved field; and a logical channel identifier field.

[0273] In one embodiment, the indication information is carried by a MAC subheader; the MAC subheader contains reserved fields;

[0274] The reserved field takes the first value, indicating that the user equipment has the capability or the requirement; and / or,

[0275] The reserved field takes the second value, indicating that the user equipment does not have the capability or the requirement.

[0276] In one embodiment, the indication information is carried by the MAC subheader and the MAC CE;

[0277] The MAC subheader contains a logical channel identifier field;

[0278] The logical channel identifier field is used to indicate that the MAC CE is used to indicate the capabilities and / or requirements of the user equipment.

[0279] In one embodiment, the value of the logical channel identifier field is a reserved value.

[0280] In one embodiment, the indication information is carried by a MAC CE;

[0281] The MAC CE is used to indicate at least one of the following:

[0282] Does the user equipment have the aforementioned capabilities and / or requirements?

[0283] The repetition level of the physical downlink shared channel;

[0284] The number of repetitions of the physical downlink shared channel.

[0285] In one embodiment, if the message carrying the indication information contains the indication information, then the user equipment has the capability and / or the requirement; and / or,

[0286] If the message carrying the instruction information does not contain the instruction information, then the user equipment does not have the capability and / or the requirement.

[0287] In one embodiment, the indication information is carried by a MAC subheader and / or a MAC CE;

[0288] If the message carrying the indication information contains the MAC subheader and / or the MAC CE, then the user equipment has the capability and / or the requirement; and / or,

[0289] If the message carrying the indication information does not contain the MAC subheader and / or the MAC CE, then the user equipment does not have the capability and / or the requirement.

[0290] The random access device provided in this application embodiment can be used to execute the random access method provided in any of the above embodiments, and has corresponding functions and beneficial effects.

[0291] This application also provides a user equipment, including a processor and a memory, wherein the memory is configured to store a computer program, and when the computer program is executed by the processor, the processor enables the processor to implement the random access method described above.

[0292] This application also provides a network device, including a processor and a memory, wherein the memory is configured to store a computer program, and when the computer program is executed by the processor, the processor enables the processor to implement the above-described random access method.

[0293] This application also provides a computer-readable storage medium including a computer program that, when executed by a processor, causes the processor to implement the methods described in any embodiment.

[0294] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any other combination. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., digital video disc (DVD)), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0295] 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 application.

[0296] The above are merely preferred embodiments of this application and do not limit the embodiments and protection scope of this application. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the description and illustrations of this application should be included within the protection scope of this application.

Claims

1. A random access method, characterized in that, The method is executed by a user equipment, and the method includes: Send indication information, which is used to indicate the capabilities and / or requirements of the user equipment; The capabilities and / or requirements include the capability and / or requirement to receive repeated Physical Downlink Shared Channel (PDSCH); The PDSCH is used to carry Msg4 in the random access procedure.

2. The method according to claim 1, characterized in that, The indication information is carried by at least one of the following messages: Msg3, Non-Access Stratum (NAS) message, Radio Resource Control (RRC) layer message, Packet Data Convergence Protocol (PDCP) layer message, Radio Link Control (RLC) layer message, Media Access Control (MAC) layer message, Physical PHY layer message, System Message (SIB).

3. The method according to claim 1, characterized in that, Also includes: Based on the capabilities and / or requirements of the user's equipment, perform one of the following: Receive the PDSCH used to carry Msg4, or do not receive duplicate PDSCHs used to carry Msg4; Receive repeated PDSCHs used to carry Msg4; Receive the PDSCH of the corresponding repetition level used to carry Msg4; Receive the PDSCH used to carry Msg4 for the corresponding number of repetitions.

4. The method according to claim 1, characterized in that, It also includes one of the following: If the user equipment does not have the aforementioned capability and / or the aforementioned requirement, receive the PDSCH for carrying Msg4, or do not receive duplicate PDSCHs for carrying Msg4. If the user equipment has the aforementioned capability and / or the aforementioned requirement, receive repeated PDSCHs for carrying Msg4; If the user equipment has the aforementioned capability and / or the aforementioned requirement, receive the corresponding repetition level of PDSCH for carrying Msg4; If the user equipment has the aforementioned capability and / or the aforementioned requirement, it receives the corresponding number of repetitions of the PDSCH for carrying Msg4.

5. The method according to claim 1, characterized in that, The indication information is carried by at least one of the following parts: MAC subheader, MAC CE.

6. The method according to claim 1, characterized in that, The indication information is carried by the MAC subheader; The MAC subheader contains at least one of the following fields: Logical channel identifier field; Extended logical channel identifier field; Length field; Format field; Extended logical channel identifier field; Reserved field.

7. The method according to claim 1, characterized in that, The indication information is carried by the MAC subheader; The MAC subheader contains: LCID extended field or first reserved field; Second reserved field; Logical channel identifier field.

8. The method according to claim 1, characterized in that, The indication information is carried by the MAC header; the MAC header contains reserved fields. The reserved field takes the first value, indicating that the user equipment has the capability or the requirement; and / or, The reserved field takes the second value, indicating that the user equipment does not have the capability or the requirement.

9. The method according to claim 1, characterized in that, The indication information is carried by the MAC subheader and the MAC CE; The MAC subheader contains a logical channel identifier field; The logical channel identifier field is used to indicate that the MAC CE is used to indicate the capabilities and / or requirements of the user equipment.

10. The method according to claim 9, characterized in that, The value of the logical channel identifier field is a reserved value.

11. The method according to claim 1, characterized in that, The indication information is carried by MAC CE; The MAC CE is used to indicate at least one of the following: Does the user equipment have the aforementioned capabilities and / or requirements? The repetition level of the physical downlink shared channel; The number of repetitions of the physical downlink shared channel.

12. The method according to claim 1, characterized in that, If the message carrying the indication information contains the indication information, then the user equipment has the capability and / or the requirement; and / or, If the message carrying the instruction information does not contain the instruction information, then the user equipment does not have the capability and / or the requirement.

13. The method according to claim 1, characterized in that, The indication information is carried by the MAC subheader and / or MAC CE; If the message carrying the indication information contains the MAC subheader and / or the MAC CE, then the user equipment has the capability and / or the requirement; and / or, If the message carrying the indication information does not contain the MAC subheader and / or the MAC CE, then the user equipment does not have the capability and / or the requirement.

14. A random access method, characterized in that, The method is executed by a base station, and the method includes: Receive instruction information, The indication information is used to indicate the capabilities and / or requirements of the user equipment; The capabilities and / or requirements include the capability and / or requirement to receive repeated Physical Downlink Shared Channel (PDSCH); The PDSCH is used to carry Msg4 in the random access procedure.

15. The method according to claim 14, characterized in that, The indication information is carried by at least one of the following messages: Msg3, Non-Access Stratum (NAS) message, Radio Resource Control (RRC) layer message, Packet Data Convergence Protocol (PDCP) layer message, Radio Link Control (RLC) layer message, Media Access Control (MAC) layer message, Physical PHY layer message, System Message (SIB).

16. The method according to claim 14, characterized in that, Also includes: Based on the capabilities and / or requirements of the user's equipment, perform one of the following: Send a PDSCH to the user equipment to carry Msg4, or do not send a duplicate PDSCH to the user equipment to carry Msg4. Send repeated PDSCH messages to the user equipment to carry Msg4; Send the corresponding repeat level of PDSCH for carrying Msg4 to the user equipment; Send the PDSCH for carrying Msg4 to the user equipment a corresponding number of repetitions.

17. The method according to claim 14, characterized in that, It also includes one of the following: If the user equipment does not have the aforementioned capability and / or the aforementioned requirement, send a PDSCH for carrying Msg4 to the user equipment, or do not send duplicate PDSCHs for carrying Msg4 to the user equipment. If the user equipment has the aforementioned capability and / or the aforementioned requirement, send repeated PDSCH messages to the user equipment for carrying Msg4. If the user equipment has the aforementioned capability and / or the aforementioned requirement, send a PDSCH of the corresponding repetition level to the user equipment for carrying Msg4; If the user equipment has the aforementioned capability and / or the aforementioned requirement, send the corresponding number of PDSCH messages for carrying Msg4 to the user equipment.

18. The method according to claim 14, characterized in that, The indication information includes at least one of the following parts: MAC subheader and MAC element.

19. The method according to claim 14, characterized in that, The indication information is carried by the MAC subheader; The MAC subheader contains at least one of the following fields: Logical channel identifier field; Extended logical channel identifier field; Length field; Format field; Extended logical channel identifier field; Reserved field.

20. The method according to claim 14, characterized in that, The indication information is carried by the MAC subheader; The MAC subheader contains: LCID extended field or first reserved field; Second reserved field; Logical channel identifier field.

21. The method according to claim 14, characterized in that, The indication information is carried by the MAC header; the MAC header contains reserved fields. The reserved field takes the first value, indicating that the user equipment has the capability or the requirement; and / or, The reserved field takes the second value, indicating that the user equipment does not have the capability or the requirement.

22. The method according to claim 14, characterized in that, The indication information is carried by the MAC subheader and the MAC CE; The MAC subheader contains a logical channel identifier field; The logical channel identifier field is used to indicate that the MAC CE is used to indicate the capabilities and / or requirements of the user equipment.

23. The method according to claim 22, characterized in that, The value of the logical channel identifier field is a reserved value.

24. The method according to claim 14, characterized in that, The indication information is carried by MAC CE; The MAC CE is used to indicate at least one of the following: Does the user equipment have the aforementioned capabilities and / or requirements? The repetition level of the physical downlink shared channel; The number of repetitions of the physical downlink shared channel.

25. The method according to claim 14, characterized in that, If the message carrying the indication information contains the indication information, then the user equipment has the capability and / or the requirement; and / or, If the message carrying the instruction information does not contain the instruction information, then the user equipment does not have the capability and / or the requirement.

26. The method according to claim 14, characterized in that, The indication information is carried by the MAC subheader and / or MAC CE; If the message carrying the indication information contains the MAC subheader and / or the MAC CE, then the user equipment has the capability and / or the requirement; and / or, If the message carrying the indication information does not contain the MAC subheader and / or the MAC CE, then the user equipment does not have the capability and / or the requirement.

27. A random access device, characterized in that, include: Information sending module, used for Send indication information, which is used to indicate the capabilities and / or requirements of the user equipment; The capabilities and / or requirements include the capability and / or requirement to receive repeated Physical Downlink Shared Channel (PDSCH); The PDSCH is used to carry Msg4 in the random access procedure.

28. A random access device, characterized in that, include: The information receiving module is used to receive instruction information. The indication information is used to indicate the capabilities and / or requirements of the user equipment; The capabilities and / or requirements include the capability and / or requirement to receive repeated Physical Downlink Shared Channel (PDSCH); The PDSCH is used to carry Msg4 in the random access procedure.

29. A user equipment comprising a processor and a memory, characterized in that, The memory is configured to store a computer program, which, when executed by the processor, causes the processor to implement the random access method as described in any one of claims 1-13.

30. A base station, comprising a processor and a memory, characterized in that, The memory is configured to store a computer program, which, when executed by the processor, causes the processor to implement the random access method as described in any one of claims 14-26.

31. A computer-readable storage medium comprising a computer program, characterized in that, When the computer program is executed by the processor, the processor implements the random access method as described in any one of claims 14-26.

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