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

Abstract

The invention discloses a random access method and device, user equipment, a base station and a storage medium. The random access method is executed by user equipment, and the method comprises the following steps: sending indication information, the indication information being used for indicating the capability and / or demand of the user equipment; the capability and / or the demand comprise the capability and / or the demand for receiving the repeated PDSCH; the PDSCH is used for bearing the Msg4 of the random access process. According to the technical scheme, the UE sends the indication information, so that the base station can determine whether the UE has the capability or needs to receive the repeated Msg4 PDSCH, the PDSCH can be transmitted in a proper mode, and the success rate and the reliability of transmitting the Msg4 are improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and in particular, to a random access method, apparatus, user equipment, base station, and storage medium. Background Art

[0002] Although 5G has begun commercial use, it is limited by geographical conditions and business models and cannot guarantee network coverage in remote areas of the ocean and land. In order to break through the terrain restrictions, integrating satellite communications with ground networks to form a global seamless three-dimensional network of land, sea, air, and space has become a research hotspot in the current academic and industrial circles. International organizations such as 3GPP and ITU have also established corresponding working groups to conduct standardization research on satellite-ground integration. Among them, the non-terrestrial networks (NTN) project established by 3GPP is committed to integrating satellite communications with 5G and solving the key problem of New Radio (NR) supporting NTN. Its standardization work will lay a technical foundation for 6G satellite-ground integration research. The future integrated network of air, space, and ground will focus on deep integration, combining multiple communication platforms to provide more extensive and diversified communication services.

[0003] In the existing technical research, for the NTN network, the non-ground base stations carried by satellites and other carriers are far away from the ground, and the coverage strength of the signals they transmit is limited on the ground, so it is necessary to enhance the downlink coverage. For the random access (RA) process, the conflict or contention resolution message (Msg4) can be sent through the physical downlink shared channel (Physical Downlink Shared Channel, PDSCH). When enhancing the transmission of Msg4 PDSCH, it is necessary to consider the receiving capability of the UE, so as to adopt a suitable method to transmit the Msg4 PDSCH, so that the UE has more opportunities or a greater probability to successfully receive the Msg4 PDSCH.

[0004] However, since the base station does not know the UE's receiving capability, the transmission of Msg4 PDSCH may be enhanced when the UE does not have the receiving capability of the enhanced Msg4 PDSCH or the capability is weak, thereby wasting unnecessary resources and the UE may not be able to correctly receive the Msg4 PDSCH. It is also possible that when the UE has the receiving capability of the enhanced Msg4 PDSCH or the capability is strong, the transmission of Msg4 PDSCH is not enhanced, resulting in the UE failing to receive Msg4, etc. Summary of the invention

[0005] In view of the above-mentioned problem that the base station cannot determine whether the UE is capable of or needs to receive the enhanced Msg4 PDSCH, the present application provides a random access method, apparatus, user equipment, base station and storage medium.

[0006] An embodiment of the present application provides a random access method, which is performed by a user equipment, and includes:

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

[0008] The capability and / or requirement includes the capability and / or requirement to receive repeated PDSCH;

[0009] The PDSCH is used to carry Msg4 of the random access process.

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

[0011] Receive instruction information,

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

[0013] The capability and / or requirement includes the capability and / or requirement to receive repeated physical downlink shared channels PDSCH;

[0014] The PDSCH is used to carry Msg4 of the random access process.

[0015] The embodiment of the present application provides a random access device, including:

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

[0017] The capability and / or requirement includes the capability and / or requirement to receive repeated PDSCH;

[0018] The PDSCH is used to carry Msg4 of the random access process.

[0019] The embodiment of the present application provides a random access device, including:

[0020] An information receiving module, used for receiving indication information,

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

[0022] The capability and / or requirement includes the capability and / or requirement to receive repeated physical downlink shared channels PDSCH;

[0023] The PDSCH is used to carry Msg4 of the random access process.

[0024] An embodiment of the present application provides a network device, including:

[0025] one or more processors;

[0026] A 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 above-mentioned random access method.

[0028] An embodiment of the present application provides a user equipment, including:

[0029] one or more processors;

[0030] A 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 above-mentioned random access method.

[0032] An embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the above-mentioned random access method is implemented.

[0033] The embodiments of the present application provide a random access method, apparatus, user equipment, base station and storage medium. The random access method is executed by a user equipment, and the method includes: sending indication information, the indication information is used to indicate the capabilities and / or requirements of the user equipment; the capabilities and / or requirements include the ability and / or requirements to receive repeated Msg4 PDSCH; the PDSCH is used to carry the Msg4 of the random access process. In the above technical solution, by sending indication information, the UE can make the base station clear whether the UE is capable of or needs to receive repeated Msg4 PDSCH, and then can adopt an appropriate method to transmit PDSCH, thereby improving the success rate and reliability of transmitting Msg4. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0035] Figure 1 A schematic diagram of a 4-step random access provided in an embodiment of the present application;

[0036] Figure 2A flowchart of a random access method provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of a MAC subheader format provided in an embodiment of the present application;

[0038] Figure 4 A flowchart of another random access method provided in an embodiment of the present application;

[0039] Figure 5 A schematic diagram of the structure of a random access device provided in an embodiment of the present application;

[0040] Figure 6 A schematic diagram of the structure of another random access device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only the parts related to the present application, rather than all structures, are shown in the accompanying drawings.

[0042] It should be mentioned before discussing the exemplary embodiments in more detail that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the steps as sequential processes, many of the steps therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of the steps can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0043] In addition, the embodiments in the present application and the features in the embodiments may be combined with each other if there is no conflict.

[0044] In the prior art, the random access (RA) process is one of the key steps for the UE to establish a connection with the network. The RA process plays an important role in scenarios such as initial access, connection reestablishment, data transmission, and switching. Taking 5G as an example, two types of random access processes are supported: 4-step RA and 2-step RA. Both types support contention-based random access (CBRA) and non-contention-free random access (CFRA).

[0045] The RA process can be triggered by at least one of the following events:

[0046] Initial access from RRC idle (RRC_IDLE) state;

[0047] RRC connection re-establishment process;

[0048] In the RRC connected (RRC_CONNECTED) state or the RRC inactive (RRC_INACTIVE) state, downlink or uplink data arrives and the uplink synchronization state is unsynchronized;

[0049] In the RRC_CONNECTED or RRC_INACTIVE state, uplink data arrives during the Small Data Transmission (SDT) process and there is no Physical Uplink Control Channel (PUCCH) resource for Scheduling Request (SR) transmission;

[0050] Handover (unless handover without Random Access Channel (RACH) is configured);

[0051] SR failed;

[0052] Explicit request by RRC during synchronization reconfiguration;

[0053] RRC connection recovery procedure in RRC_INACTIVE state;

[0054] Establish time alignment for primary or secondary tags (TAG);

[0055] Request other system information (such as beam failure recovery);

[0056] Consistent uplink Listen-Before-Talk (LBT) failure occurs on the Special Cell (SpCell);

[0057] In the RRC_CONNECTED state, a time advance is required for positioning.

[0058] Figure 1 FIG. 4 is a schematic diagram of a 4-step RA provided in one embodiment. Figure 1As shown, for the 4-step RA, it includes MSG1 to MSG4. Among them, MSG1 transmits the preamble code on the physical random access channel (PRACH), and the UE monitors the response from the network within the configured window. For CBRA, after receiving the random access response, the UE uses the resources granted by the uplink (UL) to send Msg3 and monitor the contention resolution; if the contention resolution is unsuccessful, the UE will return to resend MSG1. For CFRA, the network allocates a dedicated preamble code for MSG1 transmission, and the UE ends the RA process after receiving the response.

[0059] For 2-step RA, it includes MSGA and MSGB. This process combines the preamble and payload into one message, which simplifies the RA process.

[0060] The random access process generally includes the following steps:

[0061] S1. Select SSB: The UE selects a synchronization signal and PBCH block that meets the RSRP threshold requirement. If not, it selects an SSB at random.

[0062] S2. Select a preamble index: select a preamble index based on the size of MSG3 and the path loss.

[0063] S3, Send preamble: UE transmits Msg1 preamble on PRACH;

[0064] S4. Monitor response: The UE monitors the response from the network within the configured window.

[0065] S5. Send Msg3: For CBRA, after receiving the random access response, the UE uses the UL granted resources to send MSG3 and monitor the contention resolution. For CFRA, the network allocates a dedicated preamble for Msg1 transmission, and the UE ends the RA process after receiving the response.

[0066] S6. Contention resolution: If the contention resolution is unsuccessful, the UE will return and resend Msg1.

[0067] In this application, for the downlink transmission enhancement of Msg4 in the RA process, the main enhancement method considered is that the base station sends repeated Msg4 PDSCH (Repetition Msg4 PDSCH), that is, the base station can repeatedly send the same Msg4 PDSCH to Msg4 PDSCH, which can also be understood as that the base station can send multiple Msg4 through PDSCH, and can scramble the physical downlink control channel (Physical Downlink Control Channel, PDCCH) through the scrambling code to indicate PDSCH.

[0068] However, this enhanced Msg4 PDSCH has requirements for the UE's receiving capability, where the receiving capability can be understood as the ability to receive repeated Msg4 PDSCH. In the case where the enhanced method is that the base station sends repeated Msg4 PDSCH, the receiving capability mainly refers to the UE's ability to receive repeated Msg4 PDSCH. Since the base station does not know whether the UE is capable and / or needs to receive repeated Msg4 PDSCH, it is impossible to send Msg4 PDSCH in an appropriate manner. For example, the UE does not have the ability and / or does not need to receive repeated Msg4 PDSCH, but the base station sends repeated Msg4 PDSCH, resulting in a waste of resources, and the UE may only receive one or part of the PDSCH and cannot correctly receive Msg4; for another example, the UE has the ability and / or needs to receive repeated Msg4 PDSCH, but the base station does not send repeated Msg4 PDSCH. If only one PDSCH is sent, it may cause the UE to fail to receive Msg4.

[0069] The present application provides a random access method and a random access method. By sending indication information, the UE can make the base station clear whether the UE is capable of or needs to receive repeated Msg4 PDSCH, and then the base station can transmit PDSCH in an appropriate manner. For example, when the UE is not capable of or does not need to receive repeated Msg4 PDSCH, the base station may not send repeated Msg4 PDSCH, such as sending PDSCH only once to save resources, and the UE can correctly receive Msg4 by receiving this PDSCH; for another example, when the UE is capable of or needs to receive repeated Msg4 PDSCH, the base station can send repeated Msg4 PDSCH to provide the UE with more receiving opportunities. On this basis, the success rate and reliability of transmitting Msg4 can be improved.

[0070] The user equipment (UE) in the embodiments of the present application may be referred to as a terminal, which may be a mobile terminal, a vehicle-mounted terminal, etc. Among them, UE includes all devices that provide voice and / or data connectivity to users, such as wireless terminal devices, mobile terminal devices, device-to-device communication (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 terminal devices (Light UE), reduced capability UE (REDCAP UE), subscriber unit (Subscriber Unit), subscriber station (Subscriber Station), mobile station (Mobile Station), remote station (Remote Station), access point (Access Point, AP), remote terminal (Remote Terminal), access terminal (Access Terminal), user terminal (User Terminal), user agent (User Agent), or user equipment (User Device), etc. It can also be a user device in a future communication system, which is not limited by this patent.

[0071] The network equipment in the embodiments of the present application may be an access network device, a core network device or a server, etc. The access network device may be a base station in a terrestrial communication network, or a base station in an NTN network. For example, an evolved base station eNB, a next-generation node gNB in ​​an NR system, a road side unit (RSU), or a centralized unit CU and a distributed unit DU in a cloud access network system, or an access network device in a future communication system. The core network device may be a mobility management entity (MME), a serving gateway (SGW), a packet data node gateway (PGW), a home subscriber server (HSS) storing user subscription information, a policy control unit (PCRF), etc., and may also be a core network device in a future communication system, which is not limited by the present application.

[0072] Figure 2 A flowchart of a random access method provided in an embodiment of the present application. This embodiment is applicable to the case where a UE performs random access. Specifically, the random access method can be performed by a random access device, which can be implemented by software and / or hardware and integrated in a user equipment.

[0073] like Figure 2 As shown, the sending method provided in the embodiment of the present application may include the following steps:

[0074] S110. Send indication information, where the indication information is used to indicate the capability and / or requirement of the user equipment;

[0075] The capability and / or requirement includes the capability and / or requirement to receive repeated PDSCH;

[0076] The PDSCH is used to carry Msg4 of the random access process.

[0077] The PDSCH in this embodiment can be understood as a PDSCH used to carry Msg4, and can also be expressed as Msg4PDSCH. The indication information can be used to indicate the ability and / or requirement of the UE that sends the indication information 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, and can also be understood as Msg4 PDSCH Repetition Capability / Request. In the process of the base station sending repeated Msg4PDSCH, the UE can receive each Msg4 PDSCH at any time or in real time, and can also receive each Msg4 PDSCH after the base station has sent all Msg4 PDSCHs.

[0078] Exemplarily, the indication information may be used to indicate at least one of the following:

[0079] Whether the UE has the ability to receive repeated Msg4 PDSCH;

[0080] Whether the UE needs to receive repeated Msg4 PDSCH;

[0081] The UE's ability to receive repeated Msg4 PDSCH;

[0082] The size of the PDSCH message that the UE needs to receive repeated Msg4 messages.

[0083] Correspondingly, in the case where the indication information is used to indicate whether the UE has the ability to receive repeated Msg4 PDSCH, if the UE has the ability to receive repeated Msg4 PDSCH, the base station may send repeated Msg4 PDSCH; if the UE does not have the ability to receive repeated Msg4 PDSCH, the base station may not send repeated Msg4 PDSCH;

[0084] In the case where the indication information is used to indicate whether the UE has a need to receive repeated Msg4 PDSCH, if the UE has a need to receive repeated Msg4 PDSCH, the base station may send repeated Msg4 PDSCH; if the UE does not have a need to receive repeated Msg4 PDSCH, the base station may not send repeated Msg4 PDSCH;

[0085] For the case where the indication information is used to indicate the strength of the UE's ability to receive repeated Msg4 PDSCH, if the UE has a strong ability to receive repeated Msg4 PDSCH, for example, it can receive Msg4 PDSCH with a number of repetitions and / or a repetition level greater than a specified threshold, then the base station can send an Msg4 PDSCH with a larger number of repetitions and / or a higher repetition level; if the UE has a weak ability to receive repeated Msg4 PDSCH, for example, it can receive an Msg4 PDSCH with a number of repetitions and / or a repetition level not exceeding a specified threshold, then the base station can send an Msg4 PDSCH with a smaller number of repetitions and / or a lower repetition level;

[0086] For the case where the indication information is used to indicate the size of the UE's demand for receiving repeated Msg4 PDSCH, if the UE has a greater demand for receiving repeated Msg4 PDSCH, such as the need to receive Msg4 PDSCH with a number of repetitions and / or a repetition level greater than a specified threshold, the base station may send an Msg4 PDSCH with a greater number of repetitions and / or a higher repetition level; if the UE has a smaller demand for receiving repeated Msg4 PDSCH, such as the need to receive Msg4PDSCH with a number of repetitions and / or a repetition level greater than a specified threshold, the base station may send an Msg4 PDSCH with a smaller number of repetitions and / or a lower repetition level.

[0087] In the random access method of the embodiment of the present application, the base station can clearly understand the ability and / or requirement of the UE to receive repeated Msg4 PDSCH, and accordingly determine whether to send repeated Msg4 PDSCH, and / or the number of repetitions and / or repetition level of sending repeated Msg4 PDSCH, etc. The base station and the UE use an appropriate method to transmit PDSCH, thereby improving the success rate and reliability of transmitting Msg4.

[0088] It should be noted that in the embodiments of the present application, the case of sending or receiving a single Msg4 PDSCH once is mainly used as an example for explanation. Sending or receiving an 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.

[0089] 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 Protocol (RLC) layer message, Media Access Control (MAC) layer message, Physical (PHY) layer message, System Information Block (SIB).

[0090] Taking the case where the indication information is carried by Msg3 as an example, Msg3 may include indication information and other information, such as the unique identifier of the UE. For a UE in the RRC_CONNECTED state, the identifier may be a cell radio network temporary identifier (Cell-Radio Network Temporary Identifier, C-RNTI); for a UE in the RRC_INACTIVE state, the identifier may be an identifier indicated by an upper layer.

[0091] In one embodiment, for a random access procedure that is not performed in a CONNECTED state, Msg3 is mainly configured by a higher layer, and for a random access procedure that is performed in a CONNECTED state, Msg3 mainly includes a C-RNTI.

[0092] In one embodiment, the base station and the UE may transmit one or more Msg4 PDSCHs, and whether the Msg4 PDSCH is repeated and / or the number of repetitions may be flexibly determined according to the UE's ability to receive repeated Msg4 PDSCHs. On this basis, the UE may perform one of the following according to the ability and / or requirement to receive repeated Msg4 PDSCHs:

[0093] 1) Receive the PDSCH for carrying Msg4 (i.e., Msg4 PDSCH), or do not receive repeated PDSCH for carrying 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.

[0094] 2) Receive repeated PDSCHs for carrying 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 the Msg4 PDSCH in real time or at any time, or after the base station sends X Msg4 PDSCHs.

[0095] 3) receiving a PDSCH for carrying Msg4 of a corresponding repetition level. For example, the UE may receive a corresponding number of Msg4 PDSCHs according to the repetition level. It should be noted that if the repetition level corresponds to a situation where the Msg4 PDSCH is not repeated, the UE may not receive repeated Msg4 PDSCHs.

[0096] 4) Receive PDSCH for carrying Msg4 with a corresponding number of repetitions. For example, the UE may receive the Msg4 PDSCH a corresponding number of times according to the number of repetitions. It should be noted that if the number of repetitions corresponds to the situation where Msg4 PDSCH is not repeated, the UE may not receive the repeated Msg4 PDSCH.

[0097] In one embodiment, the method further comprises one of the following:

[0098] In the case where the user equipment does not have the ability and / or need to receive repeated Msg4 PDSCH, it receives the PDSCH for carrying Msg4, or does not receive the repeated PDSCH for carrying Msg4; for example, if the UE does not have the ability and / or need to receive repeated Msg4 PDSCH, it may receive only one Msg4 PDSCH; if the base station sends multiple Msg4 PDSCHs, the UE may receive any one of them;

[0099] In the case where the user equipment has the ability and / or requirement to receive repeated Msg4 PDSCH, the repeated PDSCH for carrying Msg4 is received. For example, if the UE has the ability and / or requirement to receive repeated Msg4 PDSCH, the Msg4 PDSCH can be received at least twice; if the base station sends X (X is an integer greater than or equal to 2) times of Msg4 PDSCH, the UE can receive Y (Y is an integer greater than or equal to 2 and less than or equal to X) times of Msg4 PDSCH; in the process of the base station sending X times of Msg4 PDSCH, the UE can receive the Msg4 PDSCH in real time or at any time, or can receive it after the base station sends X times of Msg4 PDSCH;

[0100] In the case where the user equipment has the ability and / or requirement to receive repeated Msg4 PDSCH, the PDSCH for carrying Msg4 of the corresponding repetition level is received, for example, the total number of Msg4 PDSCHs with the same repetition level. If the repetition level is 4, the UE can receive Msg4 PDSCH 4 times, 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, the repeated Msg4 PDSCH may not be received;

[0101] When the user equipment has the ability and / or need to receive repeated Msg4 PDSCH, it receives the PDSCH for carrying Msg4 with the corresponding number of repetitions. For example, the total number of Msg4 PDSCHs with the same number of repetitions, 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 repeated Msg4PDSCH may not be received.

[0102] In one embodiment, the indication information is carried by at least one of the following parts: a MAC subheader (MACSubheader), a MAC control element (Control Element, CE).

[0103] Exemplarily, the MAC subheader may carry indication information to indicate whether the UE has the ability and / or need to receive repeated Msg4PDSCH; the MAC CE may also carry indication information to indicate the strength of the UE's ability and / or the size of its need to receive repeated Msg4PDSCH. In this case, it may also indirectly indicate whether the UE has the ability and / or the need to receive repeated Msg4 PDSCH. For example, if the ability is weak to a certain extent, and / or the need is small to a certain extent, it may indicate that the UE does not have the ability and / or the need to receive repeated Msg4 PDSCH; the MAC subheader and MAC CE may also carry indication information to jointly indicate whether the UE has the ability and / or the need to receive repeated Msg4 PDSCH, and the strength and / or the size of the UE's ability to receive repeated Msg4PDSCH. For example, the MAC subheader indicates whether the UE has the ability and / or the need to receive repeated Msg4 PDSCH, and the MAC CE indicates the strength and / or the size of the need to receive repeated Msg4 PDSCH; for example, the MAC subheader indicates whether the UE has the ability and / or the need to receive repeated Msg4 PDSCH, and the MAC CE indicates the strength and / or the size of the need to receive repeated Msg4 PDSCH; for example, the MAC subheader indicates whether the UE has the ability and / or the need to receive repeated Msg4 PDSCH, and the MAC CE indicates the strength and / or the size of the need to receive repeated Msg4 PDSCH; The purpose of CE is to indicate the UE's ability and / or need to receive repeated Msg4 PDSCH. The MAC CE indicates the ability and / or need to receive repeated Msg4 PDSCH.

[0104] In one embodiment, the indication information is carried by a MAC subheader; the MAC subheader includes at least one of the following fields:

[0105] The Logical Channel Identity (LCID) field is mainly used to indicate the type or padding bit of the logical channel corresponding to the corresponding MAC Service Data Unit (SDU) or the corresponding MAC CE;

[0106] The Extended Logical Channel ID (eLCID) field is mainly used to indicate the type of the logical channel corresponding to the corresponding MAC SDU or the corresponding MAC CE;

[0107] The Length (L) field is mainly used to indicate the length of the corresponding MAC SDU or variable-length MAC CE in bytes;

[0108] The Format (F) field is mainly used to indicate the size of the length field;

[0109] The logical channel identifier extension (LCID Extension, LX) field is mainly used to indicate the use of the extended logical channel space;

[0110] Reserved field, set to 0.

[0111] The MAC subheader may be aligned in byte units.

[0112] In one embodiment, the indication information is carried by a MAC subheader; the MAC subheader includes: an LCID extension field or a first reserved field; a second reserved field; and an LCID field.

[0113] Figure 3 FIG. 1 is a schematic diagram of a MAC subheader format provided by an embodiment. In this embodiment, the reserved field (reserved bit) in the MAC subheader can be used to carry indication information. Figure 3 As shown, the indication information is carried by the MAC subheader and can be used to indicate whether the UE has the ability and / or requirement to receive repeated Msg4 PDSCH. The MAC subheader may include the following three parts:

[0114] LX field or first reserved field (R), wherein the LX field may be used to indicate the use of the space of the extended logical channel, and the R field may be reserved, or may be used to indicate the capability and / or requirement of the UE to receive repeated Msg4 PDSCH, or may be reserved or may be used to indicate the capability and / or requirement of the UE to receive repeated Msg4 PDSCH;

[0115] The second reserved field (R) may be used for reservation or may be used to indicate the capability and / or requirement of the UE to receive repeated Msg4 PDSCH; or may be used for reservation or may be used to indicate the capability and / or requirement of the UE to receive repeated Msg4 PDSCH;

[0116] The LCID field may be used to indicate the type or padding bit of the logical channel corresponding to the corresponding MAC SDU or the corresponding MAC CE;

[0117] Wherein, when the first reserved field or the second reserved field is used to indicate reservation, the value may be 0 or empty or other situations;

[0118] Among them, when the first reserved field or the second reserved field is used to indicate the ability and / or requirement of the UE to receive repeated Msg4 PDSCH, the value can be 0 or 1.

[0119] The first reserved field and the second reserved field may adopt different or the same reserved field values.

[0120] For example, when the first reserved field is used to indicate reservation, the second reserved field is used to indicate the ability and / or requirement of the UE to receive repeated Msg4 PDSCH, and indicates that the UE has the ability and / or requirement to receive repeated Msg4 PDSCH, the value of the first reserved field is 0 or empty or other situations, and the second reserved field is the first value;

[0121] For another example, when the first reserved field is used to indicate reservation, the second reserved field is used to indicate the ability and / or requirement of the UE to receive repeated Msg4 PDSCH, and indicates that the UE does not have the ability and / or requirement to receive repeated Msg4 PDSCH, the first reserved field has a value of 0 or is empty or other situations, and the second reserved field has a second value;

[0122] For another example, when the first reserved field is used to indicate the capability and / or requirement of the UE to receive repeated Msg4 PDSCH, and indicates that the UE has the capability and / or requirement to receive repeated Msg4 PDSCH, when the second reserved field is used for reservation, the first reserved field has a first value, and the second reserved field is 0 or empty or other situations;

[0123] For another example, when the first reserved field is used to indicate the capability and / or requirement of the UE to receive repeated Msg4 PDSCH, and indicates that the UE does not have the capability and / or requirement to receive repeated 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 or empty or other situations;

[0124] For another example, when the first reserved field is used to indicate reservation and the second reserved field is used for reservation, the value of the first reserved field is 0 or empty or other situations, and the value of the second reserved field is 0 or empty or other situations; at this time, 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 Msg4PDSCH.

[0125] For another example, when the first reserved field is used to indicate the capability and / or requirement of the UE to receive repeated Msg4 PDSCH, and indicates that the UE does not have the capability and / or requirement to receive repeated Msg4 PDSCH, and the second reserved field is used for the capability and / or requirement of the UE to receive repeated Msg4 PDSCH, and indicates that the UE does not have the capability and / or requirement to receive repeated Msg4 PDSCH, the first reserved field takes the second value, and the second reserved field takes the second value;

[0126] For another example, when the first reserved field is used to indicate the UE's ability and / or need to receive repeated Msg4 PDSCH, and indicates that the UE has the ability and / or need to receive repeated Msg4 PDSCH, and the second reserved field is used for the UE's ability and / or need to receive repeated Msg4 PDSCH, and indicates that the UE has the ability and / or need to receive repeated Msg4 PDSCH, the first reserved field takes the first value, and the second reserved field takes the first value.

[0127] In one embodiment, the indication information is carried by the MAC subheader and can be used to indicate whether the UE has the ability and / or need to receive repeated Msg4 PDSCH. The MAC subheader includes a reserved field; the value of the reserved field is a first value, indicating that the user equipment has the ability and / or need to receive repeated Msg4 PDSCH; and / or, the value of the reserved field is a second value, indicating that the user equipment does not have the ability and / or need to receive repeated Msg4 PDSCH.

[0128] Exemplarily, the first value is 1, and if the value of the reserved field in the MAC subheader is 1, it indicates that the UE has the ability and / or need to receive repeated Msg4 PDSCH. It can be understood that if the value of the reserved field in the MAC subheader is not 1, such as a value of 0 or empty or other conditions, it indicates that the UE does not have the ability and / or need to receive repeated Msg4 PDSCH.

[0129] Exemplarily, the second value is 0. If the value of the reserved field in the MAC subheader is 0, it indicates that the UE does not have the ability and / or need to receive repeated Msg4 PDSCH. It can be understood that if the value of the reserved field in the MAC subheader is not 0, such as a value of 1 or empty or other conditions, it indicates that the UE has the ability and / or need to receive repeated Msg4 PDSCH.

[0130] It should be noted that the first value and the second value are different values. In the embodiment of the present application, there is no specific limitation on the values ​​of the first value and the second value. For example, the first value may also be other values, such as 0, that is, if the value of the reserved field in the MAC subheader is 0, it indicates that the UE has the ability and / or need to receive repeated Msg4 PDSCH. The second value may also be other values, such as 1, that is, if the value of the reserved field in the MAC subheader is 1, it indicates that the UE does not have the ability and / or need to receive repeated Msg4 PDSCH.

[0131] In one embodiment, the indication information is carried by a MAC subheader and a MAC CE, and the MAC subheader includes an LCID field; the LCID field is used to indicate that the MAC CE is used to indicate the capability and / or requirement of the UE to receive repeated Msg4 PDSCH.

[0132] The MAC subheader can be used to indicate whether the UE has the ability and / or need to receive repeated Msg4 PDSCH. The LCID field in the MAC subheader is used to indicate the purpose of the MAC CE. For example, the MAC CE can be used to indicate the ability and / or need of the UE to receive repeated Msg4 PDSCH. For example, it can indicate the strength of the ability and / or the size of the need, or it can indicate the repetition level and / or the number of repetitions. The LCID field can be any value, and different values ​​can indicate different purposes. The format of the MAC header can be found in Figure 3 .

[0133] In one embodiment, the indication information is carried by the MAC subheader and the MAC CE, and the MAC subheader includes an LCID field; the LCID field is used to indicate that the MAC CE is used to indicate the capability and / or requirement of the UE to receive repeated Msg4 PDSCH. The value of the LCID field is a reserved value.

[0134] The reserved value can range from 64 to 282. The format of the MAC header can be found in Figure 3 Taking the reserved value of 64 as an example, when the value of the LCID field in the MAC subheader is 64, it means that the MAC CE is used to indicate the UE's ability and / or requirement to receive repeated Msg4 PDSCH.

[0135] It should be noted that the reserved value may also range from 64 to N, where N may take any value.

[0136] 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:

[0137] Whether the UE has the capability and / or need to receive repeated Msg4 PDSCH;

[0138] Msg4 PDSCH repetition level;

[0139] Msg4 PDSCH repetition times.

[0140] For example, MAC CE may be used to indicate that the UE has the ability and / or requirement to receive repeated Msg4 PDSCH, so that the base station may send repeated Msg4 PDSCH and the UE may receive repeated Msg4 PDSCH; or MAC CE may be used to indicate that the UE does not have the ability and / or requirement to receive repeated Msg4 PDSCH, so that the base station may not send repeated Msg4 PDSCH and the UE may not receive repeated Msg4 PDSCH;

[0141] For another example, MAC CE may be used to indicate the repetition level of Msg4 PDSCH, so that the base station may send Msg4 PDSCH of the corresponding repetition level, and the UE may receive Msg4 PDSCH of the corresponding repetition level; it should be noted that if the repetition level corresponds to the situation that Msg4 PDSCH is not repeated, it may indirectly indicate that the UE does not have the ability and / or need to receive repeated Msg4 PDSCH, 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 situation that Msg4 PDSCH is repeated, it may indirectly indicate that the UE has the ability and / or need to receive repeated Msg4PDSCH;

[0142] For another example, MAC CE may be used to indicate the number of repetitions of Msg4 PDSCH, so that the base station may send Msg4 PDSCH with the corresponding number of repetitions, and the UE may receive Msg4 PDSCH with the corresponding number of repetitions; it should be noted that if the number of repetitions corresponds to the situation where Msg4 PDSCH is not repeated, it may indirectly indicate that the UE does not have the ability and / or need to receive repeated Msg4 PDSCH, the base station may not send repeated Msg4 PDSCH, and the UE may not receive repeated Msg4 PDSCH; if the number of repetitions corresponds to the situation where Msg4 PDSCH is repeated, it may indirectly indicate that the UE has the ability and / or need to receive repeated Msg4PDSCH;

[0143] For another example, MAC CE may be used to indicate whether the UE has the capability and / or need to receive repeated Msg4 PDSCH, and also indicate at least one of the repetition level and number of repetitions of the Msg4 PDSCH. In this case, if the UE has the capability and / or need to receive repeated Msg4 PDSCH, the repetition level and / or number of repetitions generally will not correspond to the situation where the Msg4 PDSCH is not repeated.

[0144] It should be noted that the number of repetitions can be understood as the total number of identical Msg4 PDSCHs. For example, if a total of 4 identical Msg4 PDSCHs are sent, the number of repetitions is 4. If the number of repetitions is 1 or 0, it can also be understood that the Msg4 PDSCH is not repeated. The number of repetitions can also be understood as the number of times the same Msg4 PDSCH is repeated. For example, if a total of 4 identical Msg4PDSCHs are sent, it can be understood that one Msg4 PDSCH is repeated 3 times, and the number of repetitions can be 3. If the number of repetitions is 0, it can also be understood that the Msg4 PDSCH is not repeated.

[0145] The repetition level can be understood as the total number of identical Msg4 PDSCHs. For example, if a total of 4 identical Msg4PDSCHs are sent, the repetition level can be 4. If the repetition level is 1 or 0, it can also be understood that the Msg4 PDSCH is not repeated. The repetition level can also be understood as the number of times the same Msg4 PDSCH is repeated. For example, if a total of 4 identical Msg4PDSCHs are sent, the repetition level can be 3. If the repetition level is 0, it can also be understood that the Msg4 PDSCH is not repeated. The repetition level can also be set according to other rules. For example, the repetition level is level 1, level 2, level 3...N times from low to high. The higher the repetition level, the more repetitions. A lower repetition level (such as level 1) can indicate no repetition, etc.

[0146] In one embodiment, if the message carrying the indication information includes the indication information, the user equipment has the capability and / or requirement; and / or, if the message carrying the indication information does not include the indication information, the user equipment does not have the capability and / or requirement.

[0147] In this embodiment, whether the UE has the ability and / or need to receive repeated Msg4 PDSCH can be indicated by whether the message carrying the indication information contains the indication information. Taking the case where the indication information is carried by Msg3 as an example, if Msg3 contains the indication information (regardless of the value of the indication information), it means that the UE has the ability and / or need to receive repeated Msg4 PDSCH; if Msg3 does not contain the indication information, it means that the UE does not have the ability and / or need to receive repeated Msg4 PDSCH.

[0148] In one embodiment, the indication information is carried by a MAC subheader and / or a MAC CE; if the message carrying the indication information includes a MAC subheader and / or a MAC CE, the user equipment has the capability and / or requirement; and / or, if the message carrying the indication information does not include a MAC subheader and / or a MAC CE, the user equipment does not have the capability and / or requirement.

[0149] In this embodiment, the indication information may be carried by the MAC subheader and / or MAC CE, and whether the UE has the ability and / or need to receive repeated Msg4 PDSCH may be indicated by whether the message carrying the indication information includes the MAC subheader and / or MAC CE. Taking the case where the indication information is carried by Msg3 as an example, if Msg3 includes the MAC subheader and / or MACCE (regardless of the value of the corresponding field in the MAC subheader and / or MAC CE), it means that the UE has the ability and / or need to receive repeated Msg4 PDSCH; if Msg3 does not include the MAC subheader and / or MAC CE, it means that the UE does not have the ability and / or need to receive repeated Msg4 PDSCH.

[0150] The random access method of the embodiment of the present application is described below through some examples.

[0151] As an example, the UE may send indication information to another UE to indicate whether the UE has the ability and / or requirement to receive repeated Msg4PDSCH; wherein the indication information may be carried by a MAC subheader.

[0152] Optionally, the MAC subheader includes at least one of the following fields: LCID; eLCID; L; F; LX; R.

[0153] Optionally, the MAC subheader includes the following fields: LX or the first reserved field; the second reserved field; LCID. For details, see Figure 3 .

[0154] Optionally, the MAC subheader includes a reserved field, and the value of the reserved field is a first value (such as 1), indicating that the user equipment has the ability and / or need to receive repeated Msg4 PDSCH; and / or, the value of the reserved field is a second value (such as 0), indicating that the user equipment does not have the ability and / or need to receive repeated Msg4 PDSCH.

[0155] As an example, the UE may send indication information to another UE to indicate whether the UE has the ability and / or requirement to receive repeated Msg4PDSCH; the indication information may be carried by the MAC CE.

[0156] Optionally, the MAC CE may be used to indicate at least one of the following:

[0157] Whether the user equipment has the capability and / or requirement to receive repeated Msg4 PDSCH;

[0158] a repetition level of the physical downlink shared channel;

[0159] The number of repetitions of the physical downlink shared channel.

[0160] It is understandable that, when the indication information is carried by the MAC CE, the MAC subheader may include at least one of the following fields: LCID; eLCID; L; F; LX; R. Alternatively, the MAC subheader may include the following fields: LX or the first reserved field; the second reserved field; LCID, for details, see Figure 3 .

[0161] Optionally, the LCID field in the MAC subheader may be used to indicate that the MAC CE is used to indicate the ability and / or requirement of the user equipment to receive repeated Msg4 PDSCH.

[0162] Optionally, the value of the LCID field in the MAC subheader is a reserved value.

[0163] As an example, the UE may send indication information to the UE to indicate whether the UE has the ability and / or requirement to receive repeated Msg4 PDSCH; the indication information may be carried by the MAC subheader and the MAC CE. The MAC subheader may be used to indicate whether the UE has the ability and / or requirement to receive repeated Msg4 PDSCH, and the MAC CE may be used to indicate the repetition level and / or number of repetitions of the Msg4 PDSCH that the UE can receive.

[0164] Optionally, the MAC subheader includes at least one of the following fields: LCID; eLCID; L; F; LX; R.

[0165] Optionally, the MAC subheader includes the following fields: LX or the first reserved field; the second reserved field; LCID. In this case, please refer to Figure 3 .

[0166] Optionally, the LCID field in the MAC subheader may be used to indicate that the MAC CE is used to indicate the ability and / or requirement of the user equipment to receive repeated Msg4 PDSCH.

[0167] Optionally, the value of the LCID field in the MAC subheader is a reserved value.

[0168] Optionally, the MAC CE may be used to indicate at least one of the following:

[0169] Whether the user equipment has the capability and / or requirement;

[0170] a repetition level of the physical downlink shared channel;

[0171] The number of repetitions of the physical downlink shared channel.

[0172] Figure 4A flowchart of a random access method provided in an embodiment of the present application, this embodiment can be applied to the case of random access of a UE. Specifically, the random access method can be performed by a random access device, which can be implemented by software and / or hardware and integrated in a network side device such as a base station. It should be noted that the details not described in detail in this embodiment can be referred to any of the above embodiments.

[0173] like Figure 4 As shown, the method specifically comprises the following steps:

[0174] S210. Receive indication information, where the indication information is used to indicate the capabilities and / or requirements of the user equipment; the capabilities and / or requirements include the capabilities and / or requirements for receiving repeated PDSCHs; and the PDSCH is used to carry Msg4 of the random access process.

[0175] The PDSCH in this embodiment can be understood as a PDSCH used to carry Msg4, and can also be expressed as Msg4PDSCH. The indication information can be used to indicate the ability and / or requirement of the UE that sends the indication information 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, and can also be understood as Msg4 PDSCH Repetition Capability and / or Request. By receiving the indication information, the base station can clarify whether the UE has the ability and / or requirement to receive repeated Msg4 PDSCH, and / or clarify the strength and / or requirement of the UE to receive repeated Msg4PDSCH, and based on this, it can determine whether to send repeated Msg4PDSCH, and / or the repetition level and / or number of repetitions of Msg4 PDSCH, etc. On this basis, the base station and the UE adopt an appropriate method to transmit PDSCH to improve the success rate and reliability of transmitting Msg4.

[0176] 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, SIB.

[0177] In one embodiment, the method further includes: performing one of the following according to the capability and / or requirement of the UE to receive repeated Msg4 PDSCH:

[0178] 1) Sending a PDSCH for carrying Msg4 to the user equipment, or not sending repeated PDSCH for carrying Msg4 to the user equipment, for example, the base station may send the Msg4 PDSCH only once;

[0179] 2) Sending 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) times Msg4 PDSCH, where X may be determined based on the UE's ability and / or need to receive repeated Msg4 PDSCHs.

[0180] 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, so as to avoid resource waste and UE reception failure;

[0181] For another example, the UE needs to receive Z' (Z' is any non-negative integer) Msg4 PDSCH times, then X can be an integer greater than or equal to Z', that is, the number of Msg4 PDSCH 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 need to repeatedly receive Msg4 PDSCH.

[0182] 3) Sending a PDSCH for carrying Msg4 of a corresponding repetition level to the user equipment. For example, the base station may send a corresponding number of Msg4 PDSCHs according to the repetition level. It should be noted that if the repetition level corresponds to a situation where Msg4 PDSCH is not repeated, the base station may not send repeated Msg4 PDSCHs.

[0183] 4) Sending a PDSCH for carrying Msg4 with a corresponding number of repetitions to the user equipment. For example, the base station may send a corresponding number of Msg4 PDSCHs according to the number of repetitions. It should be noted that if the number of repetitions corresponds to a situation where Msg4 PDSCH is not repeated, the base station may not send repeated Msg4 PDSCHs.

[0184] In one embodiment, the method further comprises one of the following:

[0185] In the case where the user equipment does not have the ability and / or need to receive repeated Msg4 PDSCH, a PDSCH for carrying Msg4 is sent to the user equipment, or a repeated PDSCH for carrying Msg4 is not sent to the user equipment. For example, the base station may send the Msg4 PDSCH only once.

[0186] In the case where the user equipment has the ability and / or requirement to receive repeated Msg4 PDSCH, a repeated PDSCH for carrying Msg4 is sent to the user equipment. For example, the base station may send X (X is an integer greater than or equal to 2) times of Msg4PDSCH, where X may be determined according to the ability and / or requirement of the UE to receive repeated Msg4 PDSCH;

[0187] In the case where the user equipment has the capability and / or requirement to receive repeated Msg4 PDSCH, sending a PDSCH of a corresponding repetition level for carrying Msg4 to the user equipment;

[0188] In the case that the user equipment has the capability and / or requirement to receive repeated Msg4 PDSCH, a PDSCH for carrying Msg4 with a corresponding number of repetitions is sent to the user equipment.

[0189] In one embodiment, the indication information includes at least one of the following parts: a MAC subheader, a MAC element.

[0190] In one embodiment, the indication information is carried by a MAC subheader; the MAC subheader includes at least one of the following fields: a logical channel identification field; an extended logical channel identification field; a length field; a format field; a logical channel identification extension field; and a reserved field.

[0191] In one embodiment, the indication information is carried by a MAC subheader; the MAC subheader includes: an LCID extension field or a first reserved field; a second reserved field; and a logical channel identification field.

[0192] 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.

[0193] In one embodiment, the indication information is carried by a MAC subheader and a MAC CE; the MAC subheader includes a logical channel identification field; the logical channel identification field is used to indicate that the MAC CE is used to indicate the capability and / or the requirement of the user equipment.

[0194] In one embodiment, the value of the logical channel identification field is a reserved value.

[0195] In one embodiment, the indication information is carried by a MAC CE;

[0196] The MAC CE is used to indicate at least one of the following:

[0197] Whether the user equipment has the capability and / or requirement;

[0198] a repetition level of the physical downlink shared channel;

[0199] The number of repetitions of the physical downlink shared channel.

[0200] In one embodiment, if the message carrying the indication information includes the indication information, the user equipment has the capability and / or the requirement; and / or, if the message carrying the indication information does not include the indication information, the user equipment does not have the capability and / or the requirement.

[0201] In one embodiment, the indication information is carried by a MAC subheader and / or a MAC CE;

[0202] If the message carrying the indication information includes the MAC subheader and / or the MAC CE, the user equipment has the capability and / or the requirement; and / or,

[0203] If the message carrying the indication information does not include the MAC subheader and / or the MAC CE, the user equipment does not have the capability and / or the requirement.

[0204] The random access method of the embodiment of the present application mainly adds indication information to Msg3 in the random access process, so that the network side can clearly know whether the UE has the ability and / or demand to receive repeated Msg4 PDSCH, thereby avoiding the failure of UE to receive Msg4 and / or the waste of transmission resources.

[0205] The random access method of the embodiment of the present application introduces indication information for indicating whether the UE has the capability or requirement to receive repeated Msg4 PDSCH (ie, Msg4 PDSCH Repetition Capability / Request).

[0206] Optionally, the indication information may be carried by Msg3 in the random access process, or may be carried by a NAS / RRC / PDCP / RLC / MAC / PHY layer message.

[0207] Optionally, Msg4 PDSCH Repetition is introduced, that is, repeated Msg4PDSCH can be transmitted between the base station and the UE.

[0208] Optionally, the indication information may include a MAC Subheader and / or a MAC CE.

[0209] Optionally, the MAC subheader contains at least one of the following fields:

[0210] LCID: Mainly used to indicate the type or padding bit of the logical channel corresponding to the corresponding MAC service data unit (SDU) or the corresponding MAC CE;

[0211] eLCID: Mainly used to indicate the logical channel corresponding to the corresponding MAC SDU or the type of the corresponding MAC CE;

[0212] L: Mainly used to indicate the length of the corresponding MAC SDU or variable-length MAC CE, in bytes;

[0213] F: Mainly used to indicate the size of the length field;

[0214] LX: Mainly used to indicate the use of the extended logical channel space;

[0215] R: Set to 0.

[0216] The MAC subheader may be aligned in byte units.

[0217] Optionally, the format of the MAC Subheader can be found in Figure 3 , use a reserved field (reserved bit) in a MAC subheader to carry indication information.

[0218] Optionally, different values ​​of LCID may indicate MAC CEs of different purposes. When the value of LCID is a certain Reserved value, the purpose of the MAC CE may be indicated as whether the UE has the ability and / or requirement to receive repeated Msg4 PDSCH.

[0219] Taking the case where the reserved value is 64 as an example, Table 1 shows the value of the LCID of the uplink shared channel (UL-SCH), and Table 2 shows the value of the eLCID of one octet of the UL-SCH.

[0220] Table 1 UL-SCH LCID values

[0221]

[0222] Table 2 Values ​​of an octet of eLCID for UL-SCH

[0223]

[0224] In fact, LCID may also take other values ​​to indicate that the corresponding MAC CE is used to indicate whether the UE has the ability and / or requirement to receive repeated Msg4 PDSCH.

[0225] Optionally, whether the UE sending the indication information has the capability or requirement to receive the Msg4 PDSCH that has been repetitioned (random access process Msg4 PDSCH repetition capability / request) may be indicated in the following ways:

[0226] Method 1: It can be indicated by the R field in the MAC subheader, for example: the R field value is 1, which means that it has Msg4 PDSCH Repetition Capability / Request, and the value is 0, which means that it does not have Msg4 PDSCH repetition capability / request; or, the R field value is 0, which means that it has Msg4 PDSCH Repetition Capability / Request, and the value is 1, which means that it does not have Msg4 PDSCH Repetition Capability / Request; for method 1, MAC CE may exist or not exist.

[0227] Method 2: It can be indicated by whether the indication information is included in Msg3, for example, whether the Msg3 contains MAC subheader and / or MAC CE to indicate whether the Msg4 PDSCH Repetition Capability / Request is present. For example, if the Msg3 contains MAC subheader and / or MAC CE, it indicates that the Msg4 PDSCH Repetition Capability / Request is present; if the Msg3 does not contain MAC subheader and / or MAC CE, it indicates that the Msg4 PDSCH Repetition Capability / Request is not present. As an example, whether the Msg3 contains MAC Subheader to indicate whether the Msg4 PDSCH Repetition Capability / Request is present.

[0228] Method 3: MAC CE may be used to indicate whether there is Msg4 PDSCH Repetition Capability / Request and / or the level or number of Msg4 PDSCH Repetition.

[0229] Figure 5 Schematic diagram of a random access device provided in an embodiment of the present application. Figure 5As shown, the random access device provided by this embodiment includes:

[0230] An information sending module 310 is used to send indication information, where the indication information is used to indicate the capabilities and / or requirements of the user equipment;

[0231] The capability and / or requirement includes the capability and / or requirement to receive repeated physical downlink shared channels PDSCH;

[0232] The physical downlink shared channel is used to carry Msg4 of the random access process.

[0233] 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, SIB.

[0234] In one embodiment, the apparatus further includes an execution module, configured to execute one of the following according to the capability and / or requirement of the user equipment:

[0235] Receive the PDSCH for carrying Msg4, or do not receive repeated PDSCH for carrying Msg4;

[0236] Receive repeated PDSCH for carrying Msg4;

[0237] Receive the PDSCH of the corresponding repetition level for carrying Msg4;

[0238] Receive the PDSCH for carrying Msg4 with the corresponding number of repetitions.

[0239] In one embodiment, the device further includes a channel receiving module, configured to:

[0240] In the case where the user equipment does not have the capability and / or the requirement, receiving the PDSCH for carrying Msg4, or not receiving repeated PDSCH for carrying Msg4;

[0241] In a case where the user equipment has the capability and / or the requirement, receiving repeated PDSCHs for carrying Msg4;

[0242] In the case where the user equipment has the capability and / or the requirement, receiving a PDSCH of a corresponding repetition level for carrying Msg4;

[0243] When the user equipment has the capability and / or the requirement, it receives a PDSCH for carrying Msg4 with a corresponding number of repetitions.

[0244] In one embodiment, the indication information is carried by at least one of the following parts: MAC subheader, MAC CE.

[0245] In one embodiment, the indication information is carried by a MAC subheader;

[0246] The MAC subheader includes at least one of the following fields: a logical channel identification field; an extended logical channel identification field; a length field; a format field; a logical channel identification extension field; and a reserved field.

[0247] In one embodiment, the indication information is carried by a MAC subheader;

[0248] The MAC subheader includes:

[0249] LCID extension field or first reserved field;

[0250] The second reserved field;

[0251] Logical channel identification field.

[0252] In one embodiment, the indication information is carried by a MAC subheader; the MAC subheader includes a reserved field;

[0253] The value of the reserved field is a first value, indicating that the user equipment has the capability or the requirement; and / or,

[0254] The value of the reserved field is a second value, indicating that the user equipment does not have the capability or the requirement.

[0255] In one embodiment, the indication information is carried by a MAC subheader and a MAC CE;

[0256] The MAC subheader includes a logical channel identification field; the logical channel identification field is used to indicate that the MACCE is used to indicate the capability and / or the requirement of the user equipment.

[0257] In one embodiment, the value of the logical channel identification field is a reserved value.

[0258] 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:

[0259] Whether the user equipment has the capability and / or requirement;

[0260] a repetition level of the physical downlink shared channel;

[0261] The number of repetitions of the physical downlink shared channel.

[0262] In one embodiment, if the message carrying the indication information includes the indication information, the user equipment has the capability and / or the requirement; and / or,

[0263] If the message carrying the indication information does not include the indication information, the user equipment does not have the capability and / or the requirement.

[0264] In one embodiment, the indication information is carried by a MAC subheader and / or a MAC CE;

[0265] If the message carrying the indication information includes the MAC subheader and / or the MAC CE, the user equipment has the capability and / or the requirement; and / or,

[0266] If the message carrying the indication information does not include the MAC subheader and / or the MAC CE, the user equipment does not have the capability and / or the requirement.

[0267] The random access device provided in the embodiments of the present application can be used to execute the random access method provided in any of the above embodiments, and has corresponding functions and beneficial effects.

[0268] Figure 6 Schematic diagram of a random access device provided in an embodiment of the present application. Figure 6 As shown, the random access device provided by this embodiment includes:

[0269] The information receiving module 410 is used to receive instruction information.

[0270] The indication information is used to indicate the capability and / or requirement of the user equipment;

[0271] The capability and / or requirement includes the capability and / or requirement to receive repeated physical downlink shared channels PDSCH;

[0272] The physical downlink shared channel is used to carry Msg4 of the random access process.

[0273] 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, SIB.

[0274] In one embodiment, the apparatus further includes: an execution module, configured to execute one of the following according to the capability and / or requirement of the user equipment:

[0275] Send a PDSCH for carrying Msg4 to the user equipment, or do not send a repeated PDSCH for carrying Msg4 to the user equipment;

[0276] Send repeated PDSCH for carrying Msg4 to the user equipment;

[0277] Send a PDSCH of a corresponding repetition level for carrying Msg4 to the user equipment;

[0278] A PDSCH for carrying Msg4 with a corresponding number of repetitions is sent to the user equipment.

[0279] In one embodiment, the device further includes: a channel sending module, configured to:

[0280] In the case where the user equipment does not have the capability and / or the requirement, a PDSCH for carrying Msg4 is sent to the user equipment, or a repeated PDSCH for carrying Msg4 is not sent to the user equipment;

[0281] In a case where the user equipment has the capability and / or the requirement, sending a repeated PDSCH for carrying Msg4 to the user equipment;

[0282] In the case where the user equipment has the capability and / or the requirement, sending a PDSCH of a corresponding repetition level for carrying Msg4 to the user equipment;

[0283] In the case where the user equipment has the capability and / or the requirement, a PDSCH for carrying Msg4 with a corresponding number of repetitions is sent to the user equipment.

[0284] In one embodiment, the indication information includes at least one of the following parts: a MAC subheader, a MAC element.

[0285] In one embodiment, the indication information is carried by a MAC subheader;

[0286] The MAC subheader includes at least one of the following fields: a logical channel identification field; an extended logical channel identification field; a length field; a format field; a logical channel identification extension field; and a reserved field.

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

[0288] The MAC subheader includes: an LCID extension field or a first reserved field; a second reserved field; and a logical channel identification field.

[0289] In one embodiment, the indication information is carried by a MAC subheader; the MAC subheader includes a reserved field;

[0290] The value of the reserved field is a first value, indicating that the user equipment has the capability or the requirement; and / or,

[0291] The value of the reserved field is a second value, indicating that the user equipment does not have the capability or the requirement.

[0292] In one embodiment, the indication information is carried by a MAC subheader and a MAC CE;

[0293] The MAC subheader includes a logical channel identification field;

[0294] The logical channel identification field is used to indicate that the MAC CE is used to indicate the capability and / or the requirement of the user equipment.

[0295] In one embodiment, the value of the logical channel identification field is a reserved value.

[0296] In one embodiment, the indication information is carried by a MAC CE;

[0297] The MAC CE is used to indicate at least one of the following:

[0298] Whether the user equipment has the capability and / or requirement;

[0299] a repetition level of the physical downlink shared channel;

[0300] The number of repetitions of the physical downlink shared channel.

[0301] In one embodiment, if the message carrying the indication information includes the indication information, the user equipment has the capability and / or the requirement; and / or,

[0302] If the message carrying the indication information does not include the indication information, the user equipment does not have the capability and / or the requirement.

[0303] In one embodiment, the indication information is carried by a MAC subheader and / or a MAC CE;

[0304] If the message carrying the indication information includes the MAC subheader and / or the MAC CE, the user equipment has the capability and / or the requirement; and / or,

[0305] If the message carrying the indication information does not include the MAC subheader and / or the MAC CE, the user equipment does not have the capability and / or the requirement.

[0306] The random access device provided in the embodiments of the present application can be used to execute the random access method provided in any of the above embodiments, and has corresponding functions and beneficial effects.

[0307] The present 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 implements the random access method as described above.

[0308] The present 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 implements the above-mentioned random access method.

[0309] The present application also provides a computer-readable storage medium, comprising a computer program, and when the computer program is executed by a processor, the processor is enabled to implement the method described in any embodiment.

[0310] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the process or function according to the embodiment of the present application is generated in whole or in part. 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 computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that can be accessed by the computer or a data storage device such as a server or data center that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a digital video disc (digital video disc, DVD)), or a semiconductor medium (e.g., a solid state disk (solid state disk, SSD)), etc.

[0311] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0312] The above are only preferred embodiments of the present application, and are not intended to limit the embodiments and protection scope of the present application. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present application should be included in the protection scope of the present application.

Claims

1. A random access method, characterized in that: The method is performed by a user equipment, and the method includes: Sending indication information, where the indication information is used to indicate the capabilities and / or requirements of the user equipment; The capability and / or requirement includes the capability and / or requirement to receive repeated physical downlink shared channels PDSCH; The PDSCH is used to carry Msg4 of the random access process.

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 layer NAS message, radio resource control RRC layer message, packet data convergence protocol PDCP layer message, radio link control RLC layer message, medium access control MAC layer message, physical PHY layer message, system message SIB.

3. The method according to claim 1, characterized in that Also includes: Depending on the capabilities and / or needs of the user device, do one of the following: Receive the PDSCH for carrying Msg4, or do not receive repeated PDSCH for carrying Msg4; Receive repeated PDSCH for carrying Msg4; Receive the PDSCH of the corresponding repetition level for carrying Msg4; Receive the PDSCH for carrying Msg4 with the corresponding number of repetitions.

4. The method according to claim 1, characterized in that: Also include one of the following: In the case where the user equipment does not have the capability and / or the requirement, receiving the PDSCH for carrying Msg4, or not receiving repeated PDSCH for carrying Msg4; In a case where the user equipment has the capability and / or the requirement, receiving repeated PDSCHs for carrying Msg4; In the case where the user equipment has the capability and / or the requirement, receiving a PDSCH of a corresponding repetition level for carrying Msg4; When the user equipment has the capability and / or the requirement, it receives a PDSCH for carrying Msg4 with a corresponding number of repetitions.

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 includes at least one of the following fields: Logical channel identification field; extended logical channel identification field; length field; format field; logical channel identification extension 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 includes: LCID extension field or first reserved field; The second reserved field; Logical channel identification field.

8. The method according to claim 1, characterized in that: 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.

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 includes a logical channel identification field; The logical channel identification field is used to indicate that the MAC CE is used to indicate the capability and / or the requirement of the user equipment.

10. The method according to claim 9, characterized in that The value of the logical channel identification 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: Whether the user equipment has the capability and / or requirement; a 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 includes the indication information, the user equipment has the capability and / or the requirement; and / or, If the message carrying the indication information does not include the indication information, 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 the MAC CE; If the message carrying the indication information includes the MAC subheader and / or the MAC CE, the user equipment has the capability and / or the requirement; and / or, If the message carrying the indication information does not include the MAC subheader and / or the MAC CE, the user equipment does not have the capability and / or the requirement.

14. A random access method, characterized in that: The method is performed by a base station, and the method includes: Receive instruction information, The indication information is used to indicate the capability and / or requirement of the user equipment; The capability and / or requirement includes the capability and / or requirement to receive repeated physical downlink shared channels PDSCH; The PDSCH is used to carry Msg4 of the random access process.

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 layer NAS message, radio resource control RRC layer message, packet data convergence protocol PDCP layer message, radio link control RLC layer message, medium access control MAC layer message, physical PHY layer message, system message SIB.

16. The method according to claim 14, characterized in that Also includes: Depending on the capabilities and / or needs of the user device, do one of the following: Send a PDSCH for carrying Msg4 to the user equipment, or do not send a repeated PDSCH for carrying Msg4 to the user equipment; Send repeated PDSCH for carrying Msg4 to the user equipment; Send a PDSCH of a corresponding repetition level for carrying Msg4 to the user equipment; A PDSCH for carrying Msg4 with a corresponding number of repetitions is sent to the user equipment.

17. The method according to claim 14, characterized in that Also include one of the following: In the case where the user equipment does not have the capability and / or the requirement, a PDSCH for carrying Msg4 is sent to the user equipment, or a repeated PDSCH for carrying Msg4 is not sent to the user equipment; In a case where the user equipment has the capability and / or the requirement, sending a repeated PDSCH for carrying Msg4 to the user equipment; In the case where the user equipment has the capability and / or the requirement, sending a PDSCH of a corresponding repetition level for carrying Msg4 to the user equipment; In the case where the user equipment has the capability and / or the requirement, a PDSCH for carrying Msg4 with a corresponding number of repetitions is sent 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: a MAC subheader and a MAC element.

19. The method according to claim 14, characterized in that The indication information is carried by the MAC subheader; The MAC subheader includes at least one of the following fields: Logical channel identification field; extended logical channel identification field; length field; format field; logical channel identification extension 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 includes: LCID extension field or first reserved field; The second reserved field; Logical channel identification field.

21. The method according to claim 14, characterized in that 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.

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 includes a logical channel identification field; The logical channel identification field is used to indicate that the MAC CE is used to indicate the capability and / or the requirement of the user equipment.

23. The method according to claim 22, characterized in that The value of the logical channel identification 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: Whether the user equipment has the capability and / or requirement; a 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 includes the indication information, the user equipment has the capability and / or the requirement; and / or, If the message carrying the indication information does not include the indication information, 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 the MAC CE; If the message carrying the indication information includes the MAC subheader and / or the MAC CE, the user equipment has the capability and / or the requirement; and / or, If the message carrying the indication information does not include the MAC subheader and / or the MAC CE, the user equipment does not have the capability and / or the requirement.

27. A random access device, characterized in that: include: An information sending module, used to send indication information, where the indication information is used to indicate the capabilities and / or requirements of the user equipment; The capability and / or requirement includes the capability and / or requirement to receive repeated physical downlink shared channels PDSCH; The PDSCH is used to carry Msg4 of the random access process.

28. A random access device, characterized in that: include: An information receiving module, used for receiving indication information, The indication information is used to indicate the capability and / or requirement of the user equipment; The capability and / or requirement includes the capability and / or requirement to receive repeated physical downlink shared channels PDSCH; The PDSCH is used to carry Msg4 of the random access process.

29. A user device, comprising a processor and a memory, characterized in that: The memory is configured to store a computer program, and when the computer program is executed by the processor, the processor implements the random access method according to any one of claims 1 to 13.

30. A base station, comprising a processor and a memory, characterized in that: The memory is configured to store a computer program, and when the computer program is executed by the processor, the processor implements the random access method according to any one of claims 14 to 26.

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

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