Message transmission methods and apparatuses, ues, medium, and network-side device

Abstract

The present application belongs to the technical field of communications. Disclosed are message transmission methods and apparatuses, UEs, a medium, and a network-side device. A message transmission method in the embodiments of the present application comprises: a UE acquiring first information, the first information being used for indicating a first beam set available for the retransmission of a Msg3, the first beam set comprising at least one first beam, and the first beam set being different from a second beam set used in a failed Msg3 transmission; and the UE retransmitting the Msg3 on the at least one first beam on the basis of the first information.

Description

Message transmission method, device, UE, medium and network side equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202311736055.4 filed in China on December 14, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the field of communication technology, and specifically relates to a message transmission method, apparatus, UE, medium and network-side equipment. Background Art

[0004] In the related art, during the random access process of the user equipment (UE), the UE will first select a synchronization signal block (SSB) that meets the detection conditions, initiate a random access channel (RACH) on its associated physical random access channel transmission opportunity (RO), and listen for Msg2 or RAR in the corresponding random access response (RAR) window. If the RAR is successfully received, the UE will send Msg3 on the resource location corresponding to the physical uplink shared channel (PUSCH) indicated by the RAR for sending Msg3.

[0005] However, if the beam currently used to send Msg3 has significant interference, it may cause Msg3 transmission to fail. Typically, in related protocols, the UE will choose to continue to retransmit Msg3 on this beam. However, because the interference of this beam still exists, even if the UE retransmits Msg3 on this beam, its transmission success rate is still low, which may require the UE to re-initiate RACH, resulting in inefficient UE random access procedures. Summary of the Invention

[0006] The embodiments of the present application provide a message transmission method, apparatus, UE, medium, and network-side equipment, which can improve the success rate of Msg3 retransmission, thereby improving the efficiency of the UE in completing the random access process.

[0007] In a first aspect, a message transmission method is provided, which is executed by a UE, and the method includes: the UE obtains first information, where the first information is used to indicate a first beam set that can be used for retransmission of Msg3, the first beam set including at least one first beam, and the first beam set is different from the second beam set used when the Msg3 transmission fails; based on the first information, the UE retransmits Msg3 on at least one first beam.

[0008] In a second aspect, a message transmission method is provided, which is executed by a network side device, and the method includes: the network side device sends first information to the UE, and the first information is used to indicate a first beam set that can be used for Msg3 retransmission, and the first beam set includes at least one first beam, and the first beam set is different from the second beam set used when Msg3 transmission fails.

[0009] According to a third aspect, a message transmission device is provided, which includes: an acquisition module and a sending module; the acquisition module is used to acquire first information, the first information is used to indicate a first beam set that can be used for retransmission of Msg3, the first beam set includes at least one first beam, and the first beam set is different from the second beam set used when the Msg3 transmission fails; the sending module is used to retransmit Msg3 on at least one first beam based on the first information acquired by the acquisition module.

[0010] In a fourth aspect, a message transmission device is provided, which includes: a sending module; the sending module is used to send first information to the UE, the first information is used to indicate a first beam set that can be used for Msg3 retransmission, the first beam set includes at least one first beam, and the first beam set is different from the second beam set used when Msg3 transmission fails.

[0011] In a fifth aspect, a UE is provided, which includes a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0012] In the sixth aspect, a UE is provided, including a processor and a communication interface, wherein the processor is used to retransmit Msg3 on at least one first beam based on first information, and the communication interface is used to obtain the first information, and the first information is used to indicate a first beam set that can be used for Msg3 retransmission, the first beam set including at least one first beam, and the first beam set is different from the second beam set used when Msg3 transmission fails.

[0013] In the seventh aspect, a network side device is provided, which includes a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the first aspect are implemented.

[0014] In the eighth aspect, a network side device is provided, including a processor and a communication interface, wherein the communication interface is used to send first information to the UE, the first information is used to indicate a first beam set that can be used for Msg3 retransmission, the first beam set includes at least one first beam, and the first beam set is different from the second beam set used when Msg3 transmission fails.

[0015] In the ninth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.

[0016] In the tenth aspect, a wireless communication system is provided, comprising: a terminal and a network side device, wherein the terminal can be used to execute the steps of the method described in the first aspect, and the network side device can be used to execute the steps of the method described in the second aspect.

[0017] In the eleventh aspect, a chip is provided, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the method as described in the first aspect, or to implement the method as described in the second aspect.

[0018] In a twelfth aspect, a computer program / program product is provided, wherein the computer program / program product is stored in a storage medium, and the program / program product is executed by at least one processor to implement the steps of the message transmission method as described in the first aspect.

[0019] In an embodiment of the present application, the UE obtains first information, where the first information is used to indicate a first beam set that can be used for Msg3 retransmission, the first beam set including at least one first beam, which is different from the second beam set used when Msg3 transmission fails; based on the first information, the UE retransmits Msg3 on at least one first beam. In this solution, by obtaining the beam set indicating Msg3 retransmission, the UE can provide the UE with at least one beam set that is different from the beam set used when Msg3 transmission fails, so that the UE can retransmit Msg3 on at least one first beam in the beam set, thereby improving the success rate of Msg3 retransmission and further improving the success rate and reliability of UE random access. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic diagram of a possible structure of a communication system involved in an embodiment of the present application;

[0021] FIG2 is a flow chart of a message transmission method according to an embodiment of the present application;

[0022] FIG3 is a schematic diagram of a group of PRACH repeated transmissions provided in an embodiment of the present application;

[0023] FIG4 is a schematic diagram of a group of repeated transmissions of Msg3 provided in an embodiment of the present application;

[0024] FIG5 is a second flow chart of a message transmission method provided in an embodiment of the present application;

[0025] FIG6 is a third flow chart of a message transmission method provided in an embodiment of the present application;

[0026] FIG7 is a fourth flow chart of a message transmission method provided in an embodiment of the present application;

[0027] FIG8 is a fifth flow chart of a message transmission method provided in an embodiment of the present application;

[0028] FIG9 is a sixth flow chart of a message transmission method provided in an embodiment of the present application;

[0029] FIG10 is a flow chart of a message transmission method according to an embodiment of the present application;

[0030] FIG11 is a structural diagram of a message transmission device according to an embodiment of the present application;

[0031] FIG12 is a second structural diagram of a message transmission device provided in an embodiment of the present application;

[0032] FIG13 is a third structural diagram of a message transmission device provided in an embodiment of the present application;

[0033] FIG. 14 is a fourth structural diagram of a message transmission device provided in an embodiment of the present application.

[0034] FIG15 is a schematic diagram of the hardware structure of a communication device provided in an embodiment of the present application;

[0035] FIG16 is a schematic diagram of the hardware structure of a terminal provided in an embodiment of the present application;

[0036] FIG17 is a schematic diagram of the hardware structure of a network-side device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0038] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and do not limit the number of objects, for example, the first object can be one or more. In addition, "or" in this application represents at least one of the connected objects. For example, "A or B" covers three options, namely, Option 1: including A but not including B; Option 2: including B but not including A; Option 3: including both A and B. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0039] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, the operation to be performed, or the requested result, etc. in the instruction sent; an indirect indication can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the operation to be performed or the requested result, etc. based on the judgment result.

[0040] The following is an explanation of the technical terms involved in the technical solutions provided in the embodiments of this application:

[0041] 1) Non-cellular massive multiple-in multiple-out (MIMO) system:

[0042] Cell-free or cell-free massive MIMO systems can be considered a deconstruction of traditional massive MIMO systems, where antennas are concentrated at a single site or base station, and UEs are distributed around the base station in the form of cells.

[0043] In a massive MIMO system, each base station deploys a large number of antennas. This provides higher array gain and spatial resolution. Multiple UEs can be served simultaneously using the same time and frequency resources, delivering high throughput, high reliability, and high energy efficiency. Cell-free massive MIMO systems eliminate the concept of cells. Instead, a large number of antennas are distributed over a wide area, and UEs are similarly dispersed across this wide area. These antennas are called Transmit-Receive Points (TRPs) or Access Points (APs). In theory, each UE can communicate with every AP. Leveraging the fronthaul network and the central processing unit (CPU), a large number of geographically dispersed TRPs can collectively serve a smaller number of UEs. The CPU utilizes channel statistics for joint detection. Cell-free massive MIMO networks are expected to be applied in next-generation indoor and hotspot coverage scenarios, such as smart factories, train stations, shopping malls, stadiums, subways, hospitals, community centers, and university campuses.

[0044] In actual implementation, the non-cellular or non-cell network in the hotspot area can be regarded as a super cell containing multiple TRPs, where multiple TRPs use the same cell ID. According to the synchronization accuracy and connection relationship between these TRPs, multiple TRPs with high synchronization accuracy can achieve collaborative transmission.

[0045] 2) Cell search and synchronization process in New Radio (NR) technology:

[0046] In existing 5G NR technology, in order to achieve downlink synchronization, the UE needs to obtain the frequency of the access carrier by searching the synchronization block (SS / PBCH Block, SSB). Since the NR spectrum range is very wide, to reduce the complexity of the search, the UE performs SSB search according to a certain frequency interval specified by the protocol. This frequency interval is called the synchronization raster. The UE detects the received power of the synchronization signal (SS reference signal received power, SS-RSRP) on the corresponding frequency according to the synchronization raster and selects any SSB with an SS-RSRP higher than the threshold value (rsrp-ThresholdSSB). By demodulating the primary synchronization signal (PSS), secondary synchronization signal (SSS) and physical broadcast channel (PBCH) signals in the selected SSB, the UE completes cell selection and synchronization with the base station, and then performs random access.

[0047] 3) Random access process

[0048] In the prior art, there are contention-based random access procedures and non-contention-based random access procedures.

[0049] In the contention-based 4-step RACH process, the UE first sends Msg1, which contains a preamble, to the network device. After the network device detects the preamble, it sends Msg2 or a RAR message, which contains the number of the preamble detected by the network device and the uplink wireless resources allocated to the UE to send Msg3. After receiving Msg2, the UE confirms that at least one of the preamble numbers carried in Msg2 is consistent with the number of the preamble it sent, and then sends Msg3 containing contention resolution information based on the resources indicated by the RAR. After receiving Msg3, the network device sends Msg4 containing contention resolution information. After receiving Msg4, the UE confirms that the contention resolution information is consistent with the one it sent in Msg3, thus completing the 4-step random access.

[0050] The network side device includes uplink grant (UL grant) information in the RAR to indicate the Msg3 PUSCH scheduling information, and includes RAP ID (RACH preamble ID), Transmission Configuration-Radio Network Temporary Identifier (TC-RNTI), Timing Advance (TA), etc. If the network side device does not receive the Msg3 PUSCH, it can reschedule the Msg3 PUSCH in the TC-RNTI scrambled physical downlink control channel (PDCCH).

[0051] For the contention random access process, different UEs randomly select preambles for transmission. In this way, different UEs may select the same preamble to send on the same time-frequency radio resources, i.e., RO resources. This situation can be understood as a UE preamble conflict. In this case, different UEs will receive the same RAR. At this time, different UEs will transmit MSG3 PUSCH according to the scheduling information in the RAR UL grant. The network can only decode the PUSCH (including contention resolution information) sent by one UE on one Msg3 PUSCH scheduling resource. Therefore, the network will include the contention resolution information received in Msg3 in Msg4. If the contention resolution information in Msg4 received by the UE matches the contention resolution information sent by the UE in Msg3 PUSCH, the UE considers that the contention resolution is successful. If they do not match, the contention resolution is considered unsuccessful.

[0052] If the contention resolution is unsuccessful, the UE reselects RACH transmission resources, performs PRACH transmission, and makes the next random access attempt.

[0053] 3) Msg3 repeated transmission process (Rel-17):

[0054] Step 1: The UE requests repeated transmission of Msg3. When the UE finds that the RSRP value of the downlink path loss reference is lower than a certain RSRP threshold, it sends a specific preamble at the configured PRACH transmission opportunity.

[0055] Step 2: The base station schedules repeated Msg3 transmissions. When the base station detects a specific preamble, it determines that the corresponding UE has sent a Msg3 retransmission request. The base station decides whether to schedule repeated Msg3 transmissions and indicates the number of Msg3 retransmissions using the most significant two bits of the modulation and coding scheme (MCS) information field. For example, the number of retransmissions can be 1, and the remaining bits of the MCS field are used to indicate the MCS value.

[0056] Step 3: The UE obtains the Msg3 transmission configuration and transmits the Msg3 according to the corresponding configuration.

[0057] 4) Random access process for multiple SSB associations:

[0058] At the cell edge or in areas with limited coverage, the uplink signal coverage performance of a terminal is worse than the downlink signal coverage. Specifically, the coverage performance of Msg1 and Msg3 is worse than that of Msg2 and Msg4. Furthermore, the coverage performance gap between uplink and downlink channels is even more pronounced in the high-frequency band FR2. To improve uplink signal coverage, repeated uplink signal transmission is being considered. Release 17 introduced a repeated Msg3 transmission mechanism to improve Msg3 coverage, but this mechanism is still limited to repeated transmission within a single Msg3 beam.

[0059] In future coverage-limited scenarios, since SSB beams are typically fixed beams, there may be areas of beam overlap between SSB beams. In this case, the signal quality SS-RSRP of multiple SSBs detected by the terminal may be similar. Selecting one of the SSB beams for random access means giving up other possible SSB beams. If multiple SSBs can be selected to send Msg1, the probability of the base station successfully detecting Msg1 can be increased. In addition, since the SS-RSRP measurement is determined only based on a single measurement result of the SSB during the random access phase, there may be measurement deviation in the SS-RSRP measurement result. Therefore, selecting multiple SSBs to send Msg1 can also reduce the impact of SSB measurement deviation on SSB selection. When the Msg1 signal is sent based on multiple SSBs, the network can also further instruct the UE to send multiple Msg3 signals in the same beam direction based on the successfully received Msg1 signal, thereby increasing the probability of the UE successfully completing random access.

[0060] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the technology described can be used for the systems and radio technologies mentioned above, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for illustrative purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than NR systems, such as 6th generation (6G) systems. th Generation, 6G) communication system.

[0061] FIG1 is a block diagram of a wireless communication system applicable to an embodiment of the present application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR), a virtual reality (VR) device, a robot, a wearable device (Wearable Device), an aircraft (Flight Vehicle), a vehicle-mounted device (VUE), a ship-mounted device, a pedestrian user equipment (PUE), a smart home (home appliances with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), a game console, a personal computer (PC), an ATM, or a self-service machine, or other terminal-side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be called a radio access network (Radio Access Network, RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (WLAN) access point (AP) or a wireless fidelity (WiFi) node, etc.Among them, the base station can be referred to as Node B (NB), Evolved Node B (eNB), the next generation Node B (gNB), New Radio Node B (NR Node B), access point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B (home evolved Node B), Transmission Reception Point (TRP) or other appropriate terms in the field. As long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0062] The message transmission method, apparatus, UE, medium, and network-side equipment provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through some embodiments and their application scenarios.

[0063] FIG2 shows a flow chart of a message transmission method provided in an embodiment of the present application. As shown in FIG2 , the message transmission method may include the following steps 201 and 202:

[0064] Step 201: The UE obtains first information.

[0065] In some embodiments of the present application, the above-mentioned first information is used to indicate the first beam set that can be used for Msg3 retransmission.

[0066] In some embodiments of the present application, the first information may be scrambled by a temporary RNTI that is scrambled by the UE when transmitting Msg3. For example, the RNTI in the NR may be a TC-RNTI.

[0067] In some embodiments of the present application, the above-mentioned first information may be a medium access control control element (MAC CE) signaling sent by the network side device where the UE is located, or it may be RRC signaling, non-access stratum (NAS) signaling, physical layer signaling, etc., which is not limited in this application.

[0068] In some embodiments of the present application, the above-mentioned first information may also be indication information sent by other network-side devices.

[0069] In some embodiments of the present application, the first beam set includes at least one first beam.

[0070] Exemplarily, the first beam set may include one beam or multiple beams.

[0071] In some embodiments of the present application, the first beam set is different from the second beam set used when Msg3 transmission fails.

[0072] In a possible example, the first beam set may be a subset of the second beam set.

[0073] For example, after the UE fails to transmit Msg3 using the second beam set, i.e., beam 1, beam 2, and beam 3, it can retransmit Msg3 on the first beam set, i.e., beam 2 and beam 3.

[0074] In another possible example, at least one beam in the first beam set is different from a beam in the second beam set.

[0075] Illustratively, the beams in the first beam set may be completely different from the beams in the second beam set, or only some of the beams may be different.

[0076] For example, after the UE fails to transmit Msg3 using the second beam set, i.e., beam 1, beam 2, and beam 3, it can retransmit Msg3 on the first beam set, i.e., beam 1 and beam 3; or after the UE fails to transmit Msg3 using the second beam set, i.e., beam 1, beam 2, and beam 3, it can retransmit Msg3 on the first beam set, i.e., beam 4 and beam 5.

[0077] In some embodiments of the present application, the above-mentioned transmission of Msg3 includes repeatedly transmitting Msg3.

[0078] It should be noted that the above-mentioned first information can also indicate the beam set for repeated transmission of Msg3 in the case of initial transmission of Msg3, and the beam set can include at least one beam. In other words, the UE can perform repeated transmission of Msg3 on multiple beams.

[0079] Step 202: The UE retransmits Msg3 on at least one first beam based on the first information.

[0080] In the embodiment of the present application, the beam may be a spatial domain transmission filter or an associated reference signal.

[0081] In some embodiments of the present application, when Msg3 transmission fails, the UE may obtain first information, and then determine at least one first beam in the first beam set based on the first information, so that the UE can retransmit Msg3 on the at least one first beam.

[0082] In the message transmission method provided in the embodiment of the present application, the UE obtains first information, and the first information is used to indicate a first beam set that can be used for Msg3 retransmission. The first beam set includes at least one first beam, and the first beam set is different from the second beam set used when Msg3 transmission fails. Based on the first information, the UE retransmits Msg3 on at least one first beam. In this solution, the UE obtains the beam set indicating the retransmission of Msg3, so that when Msg3 transmission fails, at least one beam set different from the beams in the beam set used when Msg3 transmission fails can be provided to the UE, so that the UE can retransmit Msg3 on at least one first beam in the beam set, thereby improving the success rate of Msg3 retransmission and further improving the success rate and reliability of UE random access.

[0083] Optionally, in some embodiments of the present application, the first information includes at least one of the following:

[0084] 1) Beam switching indication;

[0085] 2) the first beam set or the beam set identifier of the first beam set;

[0086] 3) Beam identifier of the beam used for MGS3 retransmission;

[0087] 4) beam indication information;

[0088] 5) first instruction information;

[0089] 6) Second indication information.

[0090] The following will explain the first information in detail with respect to each item in the first information.

[0091] For 1) beam switching indication:

[0092] In some embodiments of the present application, the above-mentioned beam switching indication is used to indicate whether to switch the beam when Msg3 is retransmitted.

[0093] In some embodiments of the present application, the above-mentioned beam switching indication may be a beam switching identifier.

[0094] Exemplarily, the above-mentioned beam switching identifier can be indicated by a network side device, or can be predefined according to a protocol.

[0095] Exemplarily, the beam switching flag may be in the form of 0 or 1, or may be in the form of a special flag.

[0096] Exemplarily, the beam switching identifier in the first message may be a 1-bit beam switching identifier field, BeamSwitch. When BeamSwitch = 1, it indicates that the UE needs to use a different beam than the previous Msg3 transmission or the initial Msg3 transmission when retransmitting Msg3. When BeamSwitch = 0, it indicates that the UE does not need to switch beams when retransmitting Msg3.

[0097] For 2) the first beam set or the beam set identifier of the first beam set:

[0098] In some embodiments of the present application, the above-mentioned first information can directly indicate the first beam set that can be used by the UE, or indicate the beam set identifier of the first beam set, and the UE can determine the beam in the corresponding beam set according to the beam set identifier.

[0099] In some embodiments of the present application, the above-mentioned first beam set may be directly indicated by the network side device.

[0100] In some embodiments of the present application, the first beam set may be associated with the beam in which Msg1 is successfully transmitted.

[0101] Exemplarily, the above-mentioned first beam set can be associated with the Msg1 beam successfully received by some or all network-side devices, or correspond to some downlink SSB beams.

[0102] In some embodiments of the present application, the above-mentioned beam set identifier is used to indicate the first beam set.

[0103] In some embodiments of the present application, the above-mentioned beam set identifier can be a digital identifier or a special symbol identifier.

[0104] In some embodiments of the present application, different beam set identifiers indicate different beam sets, and different beam sets contain different beams.

[0105] 3) Beam identifier of the beam used for Msg3 retransmission:

[0106] In some embodiments of the present application, the above-mentioned beam identifier can be a digital identifier or a special symbol identifier, for example, beam1, beam2 or beam3.

[0107] In some embodiments of the present application, the beam used for retransmission of Msg3 indicates that the UE retransmits Msg3 using the beam indicated by the beam identifier.

[0108] Regarding 4) beam indication information:

[0109] In some embodiments of the present application, the above-mentioned beam indication information is used to instruct MGS3 to retransmit the available beam.

[0110] In a possible example, the beam indication information includes at least one of the following:

[0111] PRACH index;

[0112] The downlink synchronization signal block index corresponding to the preamble, or the downlink synchronization signal block index corresponding to the PRACH;

[0113] The packet sequence number of the PRACH repeated transmission;

[0114] Msg3: The packet sequence number of the historical repeated transmission.

[0115] It can be understood that the synchronization signal block refers to SSB in the NR system. The synchronization signal block described in the embodiment of the present application is not limited to specific technical terms, and the specific type of the synchronization signal block is not limited in the embodiment of the present application.

[0116] Exemplarily, the above-mentioned PRACH index is the index of the PRACH used when Msg1 is transmitted, for example, PRACH#1, PRACH#2 or PRACH#3.

[0117] Exemplarily, the downlink SSB index corresponding to the above-mentioned preamble code is the downlink SSB index corresponding to the Msg1 transmission preamble code, for example, SSB#1, SSB#2 or SSB#3.

[0118] Exemplarily, the downlink SSB index corresponding to the above-mentioned PRACH is the downlink SSB index corresponding to the PRACH transmitted by Msg1, for example, SSB#1, SSB#2 or SSB#3.

[0119] Exemplarily, different group sequence numbers in the above-mentioned PRACH repeated transmission group sequence numbers correspond to different beams, that is, PRACHs of different groups are transmitted using different beams.

[0120] Illustratively, the packet sequence number of the above-mentioned historical repeated transmission of Msg3 is the packet sequence number of any repeated transmission of Msg3, such as the packet sequence number of the repeated transmission during the initial transmission of Msg3 or the last transmission of Msg3.

[0121] Exemplarily, different group sequence numbers correspond to different beams, that is, Msg3 of different groups are transmitted using different beams.

[0122] Illustratively, the above historical repeated transmission of Msg3 may be the first repeated transmission of Msg3, the last repeated transmission of Msg3, or the last repeated transmission of Msg3.

[0123] In some embodiments of the present application, the above-mentioned beam indication information includes at least one of the following: a binary sequence, a bitmap.

[0124] In some embodiments of the present application, when the beam indication information includes the first beam set, the beam indication information includes at least one of the following: a binary sequence, a bitmap.

[0125] Exemplarily, the binary sequence may be a sequence consisting of binary digits, for example, 010, or 011, or 001.

[0126] For example, the bitmap may be a sequence of binary data pixels, for example, 000001000.

[0127] Regarding 5) the first instruction information:

[0128] In some embodiments of the present application, the first indication information indicates at least one beam that can be used for the i-th Msg3 retransmission, where i is a positive integer.

[0129] It can be understood that the UE can retransmit in sequence on at least one available beam for the i-th Msg3 retransmission as indicated by the first indication information.

[0130] Regarding 6) the second instruction information:

[0131] In some embodiments of the present application, the second indication information indicates that the transmission mode when Msg3 is retransmitted is Msg3 repeated transmission.

[0132] In some embodiments of the present application, the second indication information includes at least one of the following:

[0133] Msg3 repeats the transmission of available beams;

[0134] The number of beams that can be used for Msg3 repeated transmission;

[0135] The number of times Msg3 is retransmitted;

[0136] The number of packets when Msg3 is transmitted repeatedly.

[0137] In some embodiments of the present application, the information content in the above-mentioned second indication information may be indicated by the network side device or agreed upon by the protocol.

[0138] In some embodiments of the present application, the beam that can be used for the above-mentioned Msg3 repeated transmission can be a beam suitable for Msg3 repeated transmission.

[0139] In some embodiments of the present application, the number of repetitions of the above-mentioned Msg3 repeated transmission may refer to the total number of Msg3 repetitions, or the number of Msg3 repeated transmissions on each beam.

[0140] Illustratively, the number of beams for Msg3 repetition can be configured in the first indication information. If this parameter is not configured, it can default to 1. The total number of repetitions can also default to 1 if this parameter is not configured. For example, when [a, b] is used to represent repeated Msg3 transmission, a beams are used for Msg3 repetition, and a total of b repetitions are transmitted, that is, b / a Msg3 repetitions are performed on each beam.

[0141] For example, the beam of Msg3 repetition during retransmission by the UE may be indicated by the PRACH repetition (repetition) packet sequence number.

[0142] Specifically, when the UE sends multiple groups of PRACH repetitions, the network-side device can indicate the PRACH repetition group number corresponding to the UE in the first indication information, indicating the PRACH beam corresponding to the group number used for repeated transmission when Msg3 is retransmitted. The group number can be indicated using a bitmap or separately.

[0143] Furthermore, if the UE sends multiple groups of Msg3repetition during the initial transmission of Msg3 or the last retransmission of Msg3, the beam of the Msg3 repetition during retransmission can be indicated by the Msg3 repetition group number during the initial transmission of Msg3 or the last retransmission of Msg3.

[0144] It can be understood that the above-mentioned first indication information can also indicate the beam group sequence and beam set used by the UE for repeated transmission during the initial transmission of Msg3.

[0145] In this way, the UE obtains the first information to determine at least one first beam according to the first information, so that the UE can retransmit on the beam.

[0146] Regarding 1), when the first information includes a beam switching indication, in some embodiments of the present application, the UE determines whether it is necessary to switch to a different beam when Msg3 is retransmitted based on the above-mentioned beam switching indication, or it is understood that which specific beam to use can be implemented by the UE. If the beam switching indication instructs the UE to switch the beam, the UE determines the beam that needs to be switched as at least one first beam to obtain a first beam set; if the beam switching indication instructs the UE not to switch the beam, the UE still uses the original beam to retransmit Msg3.

[0147] In one possible example, if the beam switching indication instructs the UE to switch beams, it means that the first beam set may be a beam set excluding the beam corresponding to the last transmission; if the beam switching indication instructs the UE not to switch beams, it means that the first beam set is the beam or beam set used for the last transmission.

[0148] In some embodiments of the present application, the above-mentioned beam switching indication may be an explicit indication of the beam to be switched by the UE when retransmitting Msg3, that is, the beam to be switched is directly determined as the first beam to obtain the first beam set.

[0149] In some embodiments of the present application, the above-mentioned beam switching indication may also be an implicit indication that the UE needs to perform beam switching when retransmitting Msg3. At this time, the UE may determine the default available beam as the first beam to obtain the first beam set.

[0150] In a possible example, the UE may also obtain the successfully transmitted PRACH beam information, and then determine which beam the UE switches to for Msg3 retransmission based on the successfully transmitted PRACH beam information and the beam switching indication information.

[0151] It should be noted that the above-mentioned successfully transmitted PRACH beam information can be obtained through Msg2 (RAR), the beam information corresponding to the transmission preamble, or the SSB index information associated with PRACH.

[0152] For example, the UE selects the RO resources and preamble associated with SSB#1 and SSB#2 to send PRACH respectively. If the network-side device successfully receives two PRACH signals, the information carried in Msg2 indicates the SSB index set associated with all successfully received PRACHs to the UE, such as the indication set {SSB#1, SSB#2}. Then, when initially transmitting Msg3, the UE selects the uplink beam associated with SSB#1 to send the Msg3 signal. When the Msg3 transmission fails, the network-side device instructs the UE whether to switch the beam for Msg3 retransmission through DCI format 0_0, that is, the identification field BeamSwitch in the beam switching indication in the above first information. For example, setting BeamSwitch to 1 instructs the UE to switch the uplink beam for Msg3 retransmission. At this time, the UE can switch to the uplink beam associated with SSB#2 for Msg3 retransmission.

[0153] In some embodiments of the present application, the UE obtains a third beam set, which includes the beam used for successful transmission of Msg1. The UE determines that the UE switches to the second beam to retransmit Msg3 based on the third beam set and the beam switching indication information.

[0154] For 2), the UE can determine at least one first beam based on the first beam set indicated by the above-mentioned first information or the beam set identifier of the first beam set.

[0155] In some embodiments of the present application, the UE obtains the first information directly indicating the first beam set, and determines at least one first beam from the beam set, for example, determining one or more beams with the best quality in the first beam set as the first beam, or randomly selecting one or more or all beams as the first beam.

[0156] In some embodiments of the present application, the UE obtains a beam set identifier directly indicating the first beam set corresponding to the first beam set in the first information, determines the first beam set according to the beam set identifier, and determines at least one first beam from the first beam set.

[0157] For example, the UE selects the RO resources and preambles associated with SSB#1, SSB#2, SSB#3, and SSB#4 to send PRACH#1, PRACH#2, PRACH#3, and PRACH#4 respectively. If the network-side device successfully receives PRACH#1, PRACH#2, and PRACH#3, it feeds back Msg2 within the RAR window corresponding to PRACH#1. Then, after receiving Msg2, the UE sends Msg3 on the beam of PRACH#1; if the network-side device fails to receive Msg3, it indicates to the UE the Msg3 beam set for retransmission, that is, the first beam set mentioned above, such as the beam of {PRACH#2,PRACH#3}, or the uplink beam corresponding to {SSB#2,SSB#3}.

[0158] Regarding 3), the above-mentioned first information includes the beam identifier of the beam used for MGS3 retransmission, and the UE can directly determine the beam corresponding to the beam identifier as at least one first beam.

[0159] For 4), the above-mentioned first information includes beam indication information, and the UE can determine the beam indicated by the beam indication information as at least one first beam.

[0160] In a possible example, when the above-mentioned first information includes beam indication information but does not include a first beam set, the UE can determine at least one first beam based on the beam indicated by the beam indication information and obtain a first beam set, so that the UE can retransmit Msg3 on the at least one first beam.

[0161] Exemplarily, in the case where the above-mentioned beam indication information includes a PRACH index, the UE may determine the beam corresponding to the PRACH index for transmitting the PRACH as at least one first beam.

[0162] Exemplarily, when the above-mentioned beam indication information includes the downlink SSB index corresponding to the preamble code, the UE may also determine the beam corresponding to the downlink SSB index corresponding to the transmission preamble code, or the downlink SSB index corresponding to the PRACH, as at least one first beam.

[0163] For example, the UE selects the RO resources and preamble associated with SSB#1, SSB#2, SSB#3, and SSB#4 to send PRACH#1, PRACH#2, PRACH#3, and PRACH#4 respectively; if the network side device successfully receives PRACH#1, PRACH#2, and PRACH#3, then when Msg3 is retransmitted, the network side device can indicate that the beam transmitting PRACH#2 is used for Msg3 retransmission, or indicate that the uplink beam associated with SSB#2 is used for Msg3 retransmission.

[0164] Exemplarily, in a case where the above-mentioned beam indication information includes the group sequence number of the PRACH repeated transmission, the UE may determine the beam corresponding to the group sequence number of the PRACH repeated transmission as at least one first beam.

[0165] Exemplarily, when the UE sends multiple groups of PRACH repetitions, the network-side device may indicate to the UE the corresponding PRACH repetition group number, indicating that the UE may determine the beam corresponding to the group number as at least one first beam.

[0166] For example, as shown in Figure 3, for 9 PRACH repetitions, the PRACH transmission can be divided into 3 groups, each group consisting of 3 consecutive PRACH repetitions. The first group includes Precoding Resource Block Group 0 (PRG), PRG1, and PRG2, the second group includes PRG3, PRG4, and PRG5, and the third group includes PRG6, PRG7, and PRG8. Each group uses one beam for transmission. If the network-side device receives these 3 groups of PRACH repetitions, it can indicate the beam corresponding to a certain group of PRACH to the UE for the retransmission of Msg3 when Msg3 is retransmitted. For example, the group with the best signal quality among the beams that have not failed can be indicated to the UE. Specifically, one of the 3 groups can be indicated by a bitmap or a 2-bit binary sequence. Among them, PRG consists of a group of resource blocks (RBs) that are continuous in the frequency domain, and these continuous RBs have the same precoding.

[0167] Exemplarily, when the above-mentioned beam indication information includes the packet sequence number of the historical repeated transmission of Msg3, the UE can determine the beam corresponding to the packet sequence number as at least one first beam.

[0168] For example, as shown in Figure 4, when initially transmitting Msg3, the UE uses 8 Msg3 PUSCH repetitions. Msg3 can be divided into 4 groups, each consisting of 2 consecutive Msg3 repetitions. The first group includes PRG0 and PRG1, the second group includes PRG2 and PRG3, the third group includes PRG4 and PRG5, and the fourth group includes PRG6 and PRG7. If the network-side device receives these 4 groups of Msg3 repetitions but fails to receive them all, then when Msg3 is retransmitted, the beam corresponding to a certain group of Msg3 repetitions can be indicated to the UE for Msg3 retransmission. For example, the group with the best signal quality can be indicated to the UE. Specifically, one of the 4 groups can be indicated using a bitmap or a 2-bit binary sequence.

[0169] In another possible example, when the first information includes beam indication information and a first beam set, the UE can determine at least one first beam from the first beam set based on the beam indication information, so that the UE can retransmit Msg3 on the at least one first beam.

[0170] Furthermore, in the embodiment of the present application, in combination with FIG. 2 , as shown in FIG. 5 , the above step 202 specifically includes step 202a and step 202b:

[0171] Step 202a: The UE determines at least one first beam from the first beam set based on the beam indication information.

[0172] In some embodiments of the present application, the UE determines a beam in the first beam set as at least one first beam by interpreting a binary sequence or a bitmap.

[0173] In some embodiments of the present application, the UE determines which beam in the first beam set is used as the first beam by converting the binary sequence into decimal.

[0174] In some embodiments of the present application, the UE determines which beam in the first beam set is used as the first beam by interpreting the position of "1" in the bitmap, that is, the beam corresponding to the position with 1 is the first beam.

[0175] For example, taking the beam indication information including a binary sequence as an example, if the Msg3 retransmission beam set is the uplink beam set corresponding to {SSB#1, SSB#2, …, SSB#8}, i.e., the first beam set mentioned above, the network-side device can indicate the beam for Msg3 retransmission using a 3-bit binary sequence. For example, 010 is used to indicate that Msg3 is retransmitted via the second beam in the beam set, i.e., the uplink beam corresponding to SSB#2. 101 is used to indicate that Msg3 is retransmitted via the fifth beam in the beam set, i.e., the uplink beam corresponding to SSB#5. And so on. The number of sequence bits in the bitmap is the same as the number of beams in the Msg3 retransmission beam set.

[0176] For example, taking the beam indication information including a bitmap as an example, if the Msg3 retransmission beam set is the uplink beam set corresponding to {SSB#1, SSB#2, …, SSB#8}, i.e., the first beam set mentioned above, the network-side device can indicate the beam for Msg3 retransmission using an 8-bit binary sequence. For example, 01000000 is used to indicate that Msg3 is retransmitted using the second beam in the beam set, i.e., the uplink beam corresponding to SSB#2. 00001000 is used to indicate that Msg3 is retransmitted using the fifth beam in the beam set, i.e., the uplink beam corresponding to SSB#5. And so on. The number of bits in the binary sequence is related to the number of beams in the Msg3 retransmission beam set.

[0177] Step 202b: The UE retransmits Msg3 on at least one first beam.

[0178] In some embodiments of the present application, when Msg3 transmission fails, the UE can obtain the first information, and then determine at least one first beam in the first beam set based on the beam indicated by the beam indication information in the first information, so that the UE can retransmit Msg3 on the at least one first beam.

[0179] In another possible example, when the first information includes beam indication information but does not include the first beam set, the UE can also determine at least one first beam in the beam set including the beam used for successful transmission of Msg1 based on the beam indication information.

[0180] Optionally, in an embodiment of the present application, in combination with FIG. 2 , as shown in FIG. 6 , before step 201 , the message transmission method provided in the embodiment of the present application further includes steps 301 and 302 :

[0181] Step 301: The network-side device sends a third beam set to the UE.

[0182] Step 302: The UE receives a third beam set sent from a network-side device.

[0183] In some embodiments of the present application, the third beam set includes the beam used for successful transmission of Msg1.

[0184] Furthermore, in the embodiment of the present application, the above step 202 specifically includes step 202A and step 202B:

[0185] Step 202A: The UE determines at least one first beam from the third beam set based on the beam indication information.

[0186] In some embodiments of the present application, the third beam set may be a beam set received by the UE from a network-side device, or may be determined by the UE based on beam information historically transmitted in Msg1.

[0187] Exemplarily, the above-mentioned beam indication information includes at least one of the following: a binary sequence, a bitmap.

[0188] It can be understood that the specific steps for the UE to determine at least one first beam based on the beam indication information and the third beam set can refer to the process of the above-mentioned step 202a, which will not be repeated here.

[0189] Step 202B: The UE retransmits Msg3 on at least one first beam.

[0190] In some embodiments of the present application, when Msg3 transmission fails, the UE can obtain first information, and then determine at least one first beam in the third beam set based on the beam indicated by the beam indication information in the first information, so that the UE can retransmit Msg3 on the at least one first beam.

[0191] For 5), the above-mentioned first information includes first indication information, and the UE can determine the at least one beam indicated by the first indication information as at least one first beam.

[0192] In some embodiments of the present application, the first indication information may include a cyclic method for retransmitting Msg3.

[0193] In some embodiments of the present application, the above-mentioned circulation method includes any one of the following:

[0194] Method 1: All beams in the beam set are cyclically retransmitted, each beam is repeated once, and each retransmission uses one beam;

[0195] Method 2: All beams in the beam set are cyclically retransmitted. Each beam is repeated N times, and one beam is used for each retransmission. N is an integer greater than 1 and can be sent by the network side device or agreed upon by the protocol.

[0196] Example 1: For method 1, the beam set for retransmission of Msg3 is the beam corresponding to PRACH{#3, #4}. Then the beams for each retransmission of Msg3 are PRACH#3, #4, #3, #4, #3, #4, #3, #4, and so on, until Msg3 is successfully retransmitted.

[0197] Example 2: For method 2, when N=2, and the beam set for retransmitting Msg3 is the beam corresponding to PRACH{#3, #4}, the beams for each retransmission of Msg3 are PRACH#3, #3, #4, #4, #3, #3, #4, #4, and so on, until Msg3 is successfully retransmitted.

[0198] In some embodiments of the present application, the first indication information may also be the beam pattern of the retransmitted Msg3.

[0199] In some embodiments of the present application, the above-mentioned beam pattern is used to inform the UE of the beam or beam set selected during the i-th retransmission of Msg3.

[0200] Example 3: The beam pattern of the retransmitted Msg3 obtained by the UE is the beam corresponding to PRACH{#1,#3,#4,#3,#4}, which means that the UE schedules the PRACH#1 beam during the first retransmission of Msg3. For example, it refers to the beam corresponding to SSB#1. The beam directions scheduled during the second retransmission, third retransmission, and fourth retransmission are PRACH#3, #4, and #3 respectively. The beam scheduled in the fifth and subsequent retransmissions is PRACH#4.

[0201] Or if the beam pattern for retransmitting Msg3 obtained by the UE is the beam corresponding to PRACH{{#1,#3},{#4,#3},{#1,#4}}}, it means that the UE uses PRACH#1 beam and PRACH#3 beam during the first retransmission of Msg3, uses PRACH#4 beam and PRACH#3 beam during the second retransmission, and uses PRACH#1 beam and PRACH#4 beam during the third retransmission, and so on until Msg3 is successfully transmitted.

[0202] For 6), the above-mentioned first information includes second indication information. The UE can determine that the transmission mode is Msg3 repeated transmission based on the second indication information, and determine the beam for Msg3 retransmission based on the transmission parameters of the repeated transmission indicated by the second indication information.

[0203] In this way, the UE can determine the beam set based on the beam indicated in the first information, so that the UE can retransmit Msg3 by using different beams to improve the success rate of Msg3 transmission, thereby improving the efficiency of UE random access.

[0204] It should be noted that in an embodiment of the present application, the above-mentioned first information may include one or multiple information. The UE may determine at least one first beam based on one of them to obtain a first beam set, or may combine multiple information to determine at least one first beam to obtain a first beam set. This application does not impose any restrictions.

[0205] In a possible embodiment, the first information may be directly sent by the network side device to the UE.

[0206] Optionally, in the embodiment of the present application, in combination with FIG2 , as shown in FIG7 , the above step 201 specifically includes step 201a and step 201b:

[0207] Step 201a: The network-side device sends first information to the UE.

[0208] Step 201b: The UE receives first information sent from the network side device.

[0209] In some embodiments of the present application, the above-mentioned first information can be sent to the UE by the network side device through signaling, or can be sent to the UE by other network side devices through indication information.

[0210] In another possible embodiment, the above-mentioned first information is determined by the UE based on the beam information used for Msg1 transmission.

[0211] Optionally, in the embodiment of the present application, in combination with FIG2 , as shown in FIG8 , the above step 201 specifically includes step 201A:

[0212] Step 201A: The UE determines the first information based on the beam information used for Msg1 transmission and the first rule.

[0213] In some embodiments of the present application, the beam information used for the above-mentioned Msg1 transmission can be sent to the UE by the network side device, or can be obtained by the UE itself.

[0214] In some embodiments of the present application, the above-mentioned Msg1 transmission can be multiple Msg1 repeated transmissions or retransmissions that meet certain reception quality or other conditions, such as the best TA, as indicated by the network side device.

[0215] In some embodiments of the present application, the beam information used for the above-mentioned Msg1 transmission may be the beam information used for the retransmission of Msg1, or may be the beam information used for repeated transmission of Msg1.

[0216] In some embodiments of the present application, the beam information used for the above-mentioned Msg1 transmission may be the beam identifier used when Msg1 is transmitted, the preamble code ID corresponding to the beam used when Msg1 is transmitted, or the RO resource corresponding to the beam used when Msg1 is transmitted.

[0217] In some embodiments of the present application, the first rule includes a first association relationship between the beam information used for transmission of Msg1 and the beam information that can be used for retransmission of Msg3.

[0218] In some embodiments of the present application, the first association relationship is determined based on at least one of the following:

[0219] The order of beams used in Msg1 transmission;

[0220] The size order of the preamble code IDs corresponding to the beams used in Msg1 transmission;

[0221] The order of RO resources corresponding to the beams used when Msg1 is transmitted.

[0222] Exemplarily, the above-mentioned “sequence of beams used in Msg1 transmission” represents a sequential arrangement of beam sets, for example, the order of multiple PRACHs indicated in the RAR.

[0223] Exemplarily, the above-mentioned "order of RO resources corresponding to the beam used when Msg1 is transmitted" can be a time domain order, a frequency domain order, or a time-frequency domain order, and the size order of the RA-RNTI calculated by the corresponding RO.

[0224] For example, the UE follows the increasing order of the corresponding RO first in the frequency domain and then in the time domain. This method is mainly used in the case of multiple PRACH transmissions with different ROs.

[0225] In another possible embodiment, the above-mentioned first information can also be determined by the UE based on the beam information historically transmitted in Msg3.

[0226] Optionally, in the embodiment of the present application, in combination with FIG2 , as shown in FIG9 , the above step 201 specifically includes step 201B:

[0227] Step 201B: The UE determines the first information based on the beam information historically transmitted in Msg3 and the second rule.

[0228] In some embodiments of the present application, the second rule includes a second association relationship between the beam information used for historical transmission of Msg3 and the beam information that can be used for retransmission of Msg3.

[0229] In some embodiments of the present application, the above-mentioned second association relationship is determined based on the order of beams used in the historical transmission of Msg3.

[0230] In this way, the UE can determine the beam used for Msg3 retransmission by itself, so that the UE can use a different beam for retransmission when Msg3 is retransmitted.

[0231] Optionally, in an embodiment of the present application, in combination with FIG. 2 , as shown in FIG. 10 , after the above step 201, the message transmission method provided in the embodiment of the present application further includes steps 401 and 402:

[0232] Step 401: The UE obtains power information.

[0233] In some embodiments of the present application, the above power information is used to indicate the transmission power of the retransmission of Msg3.

[0234] In some embodiments of the present application, the power information includes Msg3 receiving power and power offset.

[0235] Step 402: The UE increases the transmission power of the first information and the retransmission of Msg3, and retransmits Msg3 on at least one first beam.

[0236] In some embodiments of the present application, the transmission power of the above-mentioned Msg3 retransmission is determined according to the target power and the power offset.

[0237] Exemplarily, the target power may be determined by a first formula.

[0238] For example, the first formula is:

[0239] Exemplarily, the target power may be determined by a first formula.

[0240] in:

[0241] P PUSCH,b,f,c (i,q) is the maximum transmit power of the UE on carrier f in serving cell c at PUSCH transmission opportunity i, e.g., in the i-th uplink subframe;

[0242] P O_PUSCH Indicates the PUSCH target power level expected by the network side device, that is, the Msg3 receive power. In particular, if the network side device does not indicate the Msg3 receive power, the default is the same as the receive power during the previous Msg3 transmission.

[0243] is the transmission bandwidth expressed in RBs, representing the transmission bandwidth corresponding to the uplink activation BWP b within carrier f of serving cell c within transmission opportunity i;

[0244] μ is an SCS parameter;

[0245] α b,f,c is the path loss compensation factor;

[0246] PL b,f,c(q) represents the downlink path loss estimated by the synchronization signal q on the activated downlink BWP of the UE in the carrier f of the serving cell c; b,f,c The calculated synchronization signal sequence number q is indicated by the network side, and q corresponds to the beam used for Msg3 retransmission;

[0247] Δ TF,b,f,c (i) Indicates the power offset values ​​of different MCS formats relative to the reference MCS format;

[0248] f b,f,c (i) represents the adjustment amount of the PUSCH transmission power, which is obtained by TPC information mapping.

[0249] In some embodiments of the present application, the transmission power of the retransmission of the above-mentioned Msg3 is calculated using the second formula.

[0250] Exemplarily, the second formula is: transmit power of retransmitted Msg3 = receive power + power offset.

[0251] It should be noted that if the power offset parameter is not set, it means that the offset is 0, that is, in this case, the sending power of the retransmitted Msg3 is the receiving power of Msg3.

[0252] Exemplarily, the power offset may be associated with the number of retransmissions on the current beam, the number of beam switching times, or the total number of retransmissions.

[0253] For example, the power offset when the UE switches beams to retransmit Msg3 can be the same as the power offset when the last Msg3 was transmitted. If the last Msg3 was initially transmitted, the power offset of the initial Msg3 transmission is 0. Or the above power offset = K total Δ, where K total is the total number of retransmissions, Δ is the power increase for each retransmission. Or power offset = K beam Δ, where K beam is the number of retransmissions on the current beam, and Δ is the power boost for each retransmission.

[0254] In a possible embodiment, the power information may be received by the UE from a network-side device.

[0255] Optionally, in some embodiments of the present application, the above step 301 specifically includes step 301a and step 301b:

[0256] Step 401a: The network-side device sends power information.

[0257] Step 401b: The UE receives power information sent from the network side device.

[0258] In another possible embodiment, the above-mentioned power information may be determined by the UE based on the power information transmitted by Msg1 and the beam information of at least one first beam determined by the UE.

[0259] Optionally, in some embodiments of the present application, the above step 401 specifically includes step 401A:

[0260] Step 401A: The UE determines power information based on the power information transmitted by Msg1 and the beam information of at least one first beam.

[0261] In another possible embodiment, the above-mentioned power information may be determined by the UE based on the power information of the historical transmission of Msg3 and the beam information of at least one first beam determined by the UE.

[0262] Optionally, in some embodiments of the present application, the above step 401 specifically includes step 401B:

[0263] Step 401B: The UE determines the power information based on the power information of the historical transmission of Msg3 and the beam information of at least one first beam.

[0264] In this way, the UE uses the power information included in the indication information so that the UE can use different powers to retransmit Msg3 according to different beams, thereby improving the success rate of Msg3 retransmission.

[0265] The message transmission method provided in the embodiment of the present application can be executed by a message transmission device. In the embodiment of the present application, the message transmission device provided in the embodiment of the present application is described by taking the method for executing message transmission by the message transmission device as an example.

[0266] The embodiment of the present application provides a message transmission device, as shown in FIG11 , the message transmission device 700 includes: an acquisition module and a sending module;

[0267] Among them, the above-mentioned acquisition module 701 is used to obtain first information, and the first information is used to indicate the first beam set that can be used for Msg3 retransmission, the first beam set includes at least one first beam, and the first beam set is different from the second beam set used when Msg3 transmission fails; the above-mentioned sending module 702 is used to retransmit Msg3 on at least one first beam based on the first information obtained by the above-mentioned acquisition module 701.

[0268] Optionally, in some embodiments of the present application, the first beam set is a subset of the second beam set; or, at least one beam in the first beam set is different from a beam in the second beam set.

[0269] Optionally, in some embodiments of the present application, the first information includes at least one of the following:

[0270] Beam switching indication: Beam switching indication is used to determine whether to switch beams when Msg3 is retransmitted.

[0271] The first beam set or the beam set identifier of the first beam set;

[0272] The beam identifier of the beam used for MGS3 retransmission;

[0273] Beam indication information, which is used to instruct MGS3 to use available beams for retransmission;

[0274] First indication information, where the first indication information indicates at least one beam that can be used for the i-th Msg3 retransmission, where i is a positive integer;

[0275] The second indication information indicates that the transmission mode when Msg3 is retransmitted is Msg3 repeated transmission.

[0276] Optionally, in some embodiments of the present application, the second indication information includes at least one of the following:

[0277] Msg3 repeats the transmission of available beams;

[0278] The number of beams that can be used for Msg3 repeated transmission;

[0279] The number of times Msg3 is retransmitted;

[0280] The number of packets when Msg3 is transmitted repeatedly.

[0281] Optionally, in some embodiments of the present application, the first beam set includes beams indicated by beam indication information;

[0282] The beam indication information includes at least one of the following:

[0283] Physical random access channel PRACH index;

[0284] The downlink synchronization signal block index corresponding to the preamble, or the downlink synchronization signal block index corresponding to the PRACH;

[0285] The packet sequence number of the PRACH repeated transmission;

[0286] Msg3: The packet sequence number of the historical repeated transmission.

[0287] Optionally, in some embodiments of the present application, in combination with Figure 11, as shown in Figure 12, the above-mentioned device 700 also includes: a determination module 703; the above-mentioned beam indication information includes at least one of the following: a binary sequence, a bitmap; the first information includes a first beam set and beam indication information; the above-mentioned determination module 703 is used to determine at least one first beam from the first beam set based on the beam indication information; the above-mentioned sending module 702 is specifically used to retransmit Msg3 on at least one first beam.

[0288] Optionally, in some embodiments of the present application, in combination with Figure 11, as shown in Figure 13, the above-mentioned device 700 also includes: a receiving module 704; the above-mentioned beam indication information includes at least one of the following: a binary sequence, a bitmap; the above-mentioned receiving module 704 is used to receive a third beam set from the network side device before the above-mentioned acquisition module 701 receives the first information, and the third beam set includes the beam used for the successful transmission of Msg1; the above-mentioned determination module 703 is also used to determine at least one first beam from the third beam set based on the beam indication information; the above-mentioned sending module 702 is specifically used to retransmit Msg3 on at least one first beam.

[0289] Optionally, in some embodiments of the present application, the acquisition module 701 is specifically configured to receive first information from a network-side device.

[0290] Optionally, in some embodiments of the present application, the above-mentioned acquisition module 701 is specifically used to determine the first information based on the beam information used for Msg1 transmission and the first rule; wherein the first rule includes a first association relationship between the beam information used for Msg1 transmission and the beam information that can be used for Msg3 retransmission.

[0291] Optionally, in some embodiments of the present application, the first association relationship is determined based on at least one of the following:

[0292] The order of beams used in Msg1 transmission;

[0293] The size order of the unique ID of the preamble code corresponding to the beam used in Msg1 transmission;

[0294] The order of physical random access opportunity (RO) resources corresponding to the beams used when Msg1 is transmitted.

[0295] Optionally, in some embodiments of the present application, the above-mentioned acquisition module 701 is specifically used to determine the first information based on the beam information of the historical transmission of Msg3 and the second rule; wherein the second rule includes the second association relationship between the beam information used for the historical transmission of Msg3 and the beam information that can be used for the retransmission of Msg3.

[0296] Optionally, in some embodiments of the present application, the above-mentioned second association relationship is determined based on the order of beams used in the historical transmission of Msg3.

[0297] Optionally, in some embodiments of the present application, the above-mentioned acquisition module 701 is also used to obtain power information, and the power information is used to indicate the transmission power of the retransmission of Msg3; the above-mentioned sending module 702 is specifically used for the first information and transmission power, and retransmits Msg3 on at least one first beam.

[0298] Optionally, in some embodiments of the present application, the acquisition module 701 is specifically configured to:

[0299] The UE receives power information from the network side device; or,

[0300] The UE determines the power information according to the power information transmitted by Msg1 and the beam information of at least one first beam; or,

[0301] The UE determines the power information based on the power information of the historical transmission of Msg3 and the beam information of at least one first beam.

[0302] In the message transmission device provided in an embodiment of the present application, first information is obtained, where the first information is used to indicate a first beam set that can be used for retransmission of Msg3. The first beam set includes at least one first beam, and the first beam set is different from the second beam set used when Msg3 transmission fails. Based on the first information, Msg3 is retransmitted on at least one first beam. In this solution, by obtaining the beam set that indicates the retransmission of Msg3, when Msg3 transmission fails, at least one beam set that is different from the beams in the beam set used when Msg3 transmission failed can be provided to the message transmission device, so that the message transmission device can retransmit Msg3 on at least one first beam in the beam set, thereby improving the success rate of Msg3 retransmission and further improving the success rate and reliability of random access of the message transmission device.

[0303] The embodiment of the present application provides another message transmission device, as shown in FIG14 , the message transmission device 800 includes: a sending module 801;

[0304] Among them, the above-mentioned sending module 801 is used to send first information to the UE, and the first information is used to indicate the first beam set that can be used for Msg3 retransmission. The first beam set includes at least one first beam, and the first beam set is different from the second beam set used when Msg3 transmission fails.

[0305] Optionally, in an embodiment of the present application, the first beam set is a subset of the second beam set; or, at least one beam in the first beam set is different from a beam in the second beam set.

[0306] Optionally, in this embodiment of the present application, the first information includes at least one of the following:

[0307] Beam switching indication: Beam switching indication is used to determine whether to switch beams when Msg3 is retransmitted.

[0308] The first beam set or the beam set identifier of the first beam set;

[0309] The beam identifier of the beam used for MGS3 retransmission;

[0310] Beam indication information, which is used to instruct MGS3 to use available beams for retransmission;

[0311] First indication information, where the first indication information indicates at least one beam that can be used for the i-th Msg3 retransmission, where i is a positive integer;

[0312] The second indication information indicates that the transmission mode when Msg3 is retransmitted is Msg3 repeated transmission.

[0313] Optionally, in this embodiment of the present application, the second indication information includes at least one of the following:

[0314] Msg3 repeats the transmission of available beams;

[0315] The number of beams that can be used for Msg3 repeated transmission;

[0316] The number of times Msg3 is retransmitted;

[0317] The number of packets when Msg3 is transmitted repeatedly.

[0318] Optionally, in an embodiment of the present application, the first beam set includes beams indicated by beam indication information;

[0319] The beam indication information includes at least one of the following:

[0320] PRACH index;

[0321] The downlink synchronization signal block index corresponding to the preamble, or the downlink synchronization signal block index corresponding to the PRACH;

[0322] The packet sequence number of the PRACH repeated transmission;

[0323] Msg3: The packet sequence number of the historical repeated transmission.

[0324] binary sequence;

[0325] Bitmap.

[0326] Optionally, in an embodiment of the present application, the above-mentioned beam indication information includes at least one of the following: a binary sequence, a bitmap; the above-mentioned sending module 801 is also used to send a third beam set to the UE before sending the first information to the UE, and the third beam set includes the beam used for the successful transmission of Msg1.

[0327] Optionally, in an embodiment of the present application, the above-mentioned sending module 801 is further used to send power information to the UE after sending the first information to the UE, and the power information is used to indicate the sending power of the retransmission of Msg3.

[0328] In the message transmission device provided in the embodiment of the present application, first information is sent to the UE, where the first information is used to indicate a first beam set that can be used for Msg3 retransmission, the first beam set including at least one first beam, and the first beam set is different from the second beam set used when Msg3 transmission fails. In this solution, by indicating the beam set for Msg3 retransmission to the UE, when Msg3 transmission fails, at least one beam set different from the beams in the beam set used when Msg3 transmission fails can be provided to the UE, so that the UE can retransmit Msg3 on at least one first beam in the beam set, thereby improving the success rate of Msg3 retransmission and further improving the success rate and reliability of random access of the message transmission device.

[0329] The message transmission device in the embodiments of the present application can be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or chip. The electronic device can be a terminal, or it can be other devices other than a terminal. For example, the terminal can include but is not limited to the types of terminal 11 listed above, and other devices can be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiments of the present application.

[0330] The message transmission device provided in the embodiment of the present application can implement the various processes implemented in the method embodiments of Figures 2 to 10 and achieve the same technical effects. To avoid repetition, they will not be described here.

[0331] As shown in Figure 15, an embodiment of the present application further provides a communication device 900, including a processor 901 and a memory 902. The memory 902 stores a program or instruction that can be run on the processor 901. For example, when the communication device 900 is a terminal, the program or instruction, when executed by the processor 901, implements the various steps of the above-mentioned message transmission method embodiment and can achieve the same technical effect. When the communication device 900 is a network-side device, the program or instruction, when executed by the processor 801, implements the various steps of the above-mentioned message transmission method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0332] The embodiment of the present application also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps in the method embodiments shown in Figures 2 to 10. This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment, and each implementation process and implementation method of the above-mentioned method embodiment can be applied to this terminal embodiment and can achieve the same technical effect. Specifically, Figure 16 is a schematic diagram of the hardware structure of a terminal that implements an embodiment of the present application, and the terminal can be a UE.

[0333] The terminal 100 includes but is not limited to: a radio frequency unit 101, a network module 102, an audio output unit 103, an input unit 104, a sensor 105, a display unit 106, a user input unit 107, an interface unit 108, a memory 109 and at least some of the components of the processor 110.

[0334] Those skilled in the art will appreciate that the terminal 100 may also include a power supply (such as a battery) to power various components. The power supply may be logically connected to the processor 110 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. The terminal structure shown in FIG16 does not limit the terminal. The terminal may include more or fewer components than shown, or may combine certain components, or have different component arrangements, which will not be described in detail here.

[0335] It should be understood that in an embodiment of the present application, the input unit 104 may include a graphics processing unit (GPU) 1041 and a microphone 1042, and the graphics processor 1041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 106 may include a display panel 1061, and the display panel 1061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 107 includes a touch panel 1071 and at least one of other input devices 1072. The touch panel 1071 is also called a touch screen. The touch panel 1071 may include two parts: a touch detection device and a touch controller. Other input devices 1072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0336] In the embodiment of the present application, after receiving downlink data from a network-side device, the RF unit 101 may transmit the data to the processor 110 for processing. Furthermore, the RF unit 101 may send uplink data to the network-side device. Typically, the RF unit 101 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and the like.

[0337] The memory 109 can be used to store software programs or instructions and various data. The memory 109 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, applications or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 109 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM), and a direct memory bus random access memory (DRRAM). The memory 109 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0338] Processor 110 may include one or more processing units. Optionally, processor 110 integrates an application processor and a modem processor. The application processor primarily handles operations related to the operating system, user interface, and application programs, while the modem processor primarily processes wireless communication signals, such as a baseband processor. It is understood that the modem processor may not be integrated into processor 110.

[0339] Among them, the above-mentioned radio frequency unit 101 is used to obtain first information, and the first information is used to indicate the first beam set that can be used for retransmission of Msg3, the first beam set includes at least one first beam, and the first beam set is different from the second beam set used when the Msg3 transmission fails; the above-mentioned radio frequency unit 101 is used to retransmit Msg3 on at least one first beam based on the first information obtained by the above-mentioned radio frequency unit 101.

[0340] Optionally, in some embodiments of the present application, the first beam set is a subset of the second beam set; or, at least one beam in the first beam set is different from a beam in the second beam set.

[0341] Optionally, in some embodiments of the present application, the first information includes at least one of the following:

[0342] Beam switching indication: Beam switching indication is used to determine whether to switch beams when Msg3 is retransmitted.

[0343] The first beam set or the beam set identifier of the first beam set;

[0344] The beam identifier of the beam used for MGS3 retransmission;

[0345] Beam indication information: The beam indication information is used to indicate the beam that can be used for Msg3 retransmission;

[0346] First indication information, where the first indication information indicates at least one beam that can be used for the i-th Msg3 retransmission, where i is a positive integer;

[0347] The second indication information indicates that the transmission mode when Msg3 is retransmitted is Msg3 repeated transmission.

[0348] Optionally, in some embodiments of the present application, the second indication information includes at least one of the following:

[0349] Msg3 repeats the transmission of available beams;

[0350] The number of beams that can be used for Msg3 repeated transmission;

[0351] The number of times Msg3 is retransmitted;

[0352] The number of packets when Msg3 is transmitted repeatedly.

[0353] Optionally, in some embodiments of the present application, the first beam set includes beams indicated by beam indication information;

[0354] The beam indication information includes at least one of the following:

[0355] PRACH index;

[0356] The downlink synchronization signal block index corresponding to the preamble, or the downlink synchronization signal block index corresponding to the PRACH;

[0357] The packet sequence number of the PRACH repeated transmission;

[0358] Msg3: The packet sequence number of the historical repeated transmission.

[0359] Optionally, in some embodiments of the present application, the above-mentioned beam indication information includes at least one of the following: a binary sequence, a bitmap; the first information includes a first beam set and beam indication information; the above-mentioned processor 110 is used to determine at least one first beam from the first beam set based on the beam indication information; the above-mentioned radio frequency unit 101 is specifically used to retransmit Msg3 on at least one first beam.

[0360] Optionally, in some embodiments of the present application, the above-mentioned beam indication information includes at least one of the following: a binary sequence, a bitmap; the above-mentioned radio frequency unit 101 is also used to receive a third beam set from the network side device before the above-mentioned radio frequency unit 101 transmits the first information, and the third beam set includes the beam used for successful transmission of Msg1; the above-mentioned processor 110 is also used to determine at least one first beam from the third beam set based on the beam indication information; the above-mentioned radio frequency unit 101 is specifically used to retransmit Msg3 on at least one first beam.

[0361] Optionally, in some embodiments of the present application, the radio frequency unit 101 is specifically configured to receive first information from a network-side device.

[0362] Optionally, in some embodiments of the present application, the above-mentioned radio frequency unit 101 is specifically used to determine the first information based on the beam information used for Msg1 transmission and the first rule; wherein the first rule includes a first association relationship between the beam information used for Msg1 transmission and the beam information that can be used for Msg3 retransmission.

[0363] Optionally, in some embodiments of the present application, the first association relationship is determined based on at least one of the following:

[0364] The order of beams used in Msg1 transmission;

[0365] The size order of the unique ID of the preamble code corresponding to the beam used in Msg1 transmission;

[0366] The order of physical random access opportunity (RO) resources corresponding to the beams used when Msg1 is transmitted.

[0367] Optionally, in some embodiments of the present application, the above-mentioned radio frequency unit 101 is specifically used to determine the first information based on the beam information of the historical transmission of Msg3 and the second rule; wherein the second rule includes a second association relationship between the beam information used for the historical transmission of Msg3 and the beam information that can be used for the retransmission of Msg3.

[0368] Optionally, in some embodiments of the present application, the above-mentioned second association relationship is determined based on the order of beams used in the historical transmission of Msg3.

[0369] Optionally, in some embodiments of the present application, the above-mentioned radio frequency unit 101 is also used to obtain power information, and the power information is used to indicate the transmission power of the retransmission of Msg3; the above-mentioned radio frequency unit 101 is specifically used for the first information and transmission power, and retransmits Msg3 on at least one first beam.

[0370] Optionally, in some embodiments of the present application, the radio frequency unit 101 is specifically configured to:

[0371] The UE receives power information from the network side device; or,

[0372] The UE determines the power information according to the power information transmitted by Msg1 and the beam information of at least one first beam; or,

[0373] The UE determines the power information based on the power information of the historical transmission of Msg3 and the beam information of at least one first beam.

[0374] In the UE provided in the embodiment of the present application, first information is obtained, where the first information is used to indicate a first beam set that can be used for Msg3 retransmission, the first beam set including at least one first beam, which is different from the second beam set used when Msg3 transmission fails; based on the first information, Msg3 is retransmitted on at least one first beam. In this solution, by obtaining the beam set indicating Msg3 retransmission, when Msg3 transmission fails, at least one beam set different from the beams in the beam set used when Msg3 transmission fails can be provided to the UE, so that the UE can retransmit Msg3 on at least one first beam in the beam set, thereby improving the success rate of Msg3 retransmission and further improving the success rate and reliability of UE random access.

[0375] The present application also provides a network-side device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps of the method embodiments shown in Figures 2 to 10. This network-side device embodiment corresponds to the aforementioned network-side device method embodiment, and each implementation process and implementation method of the aforementioned method embodiment is applicable to this network-side device embodiment and can achieve the same technical effects.

[0376] Specifically, embodiments of the present application also provide a network-side device. As shown in Figure 17, the network-side device 90 includes an antenna 91, a radio frequency device 92, a baseband device 93, a processor 94, and a memory 95. Antenna 91 is connected to radio frequency device 92. In the uplink direction, radio frequency device 92 receives information via antenna 91 and sends the received information to baseband device 93 for processing. In the downlink direction, baseband device 93 processes the information to be transmitted and sends it to radio frequency device 92. Radio frequency device 92 processes the received information and then sends it through antenna 91.

[0377] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 93 , which includes a baseband processor.

[0378] The baseband device 93 may include, for example, at least one baseband board, on which multiple chips are arranged, as shown in Figure 9, one of the chips is, for example, a baseband processor, which is connected to the memory 95 through a bus interface to call the program in the memory 95 and execute the network device operations shown in the above method embodiment.

[0379] The network side device may further include a network interface 96, which is, for example, a Common Public Radio Interface (CPRI).

[0380] Specifically, the network side device 90 of the embodiment of the present application also includes: instructions or programs stored in the memory 95 and can be run on the processor 94. The processor 94 calls the instructions or programs in the memory 95 to execute the methods executed by each module shown in Figure 14 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0381] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned message transmission method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0382] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0383] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned message transmission method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0384] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0385] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium. The computer program / program product is executed by at least one processor to implement the various processes of the above-mentioned message transmission method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0386] An embodiment of the present application further provides a communication system, including: a terminal and a network-side device, wherein the terminal can be used to execute the steps of the message transmission method described above, and the network-side device can be used to execute the steps of the message transmission method described above.

[0387] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0388] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general-purpose hardware platform, or of course, by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes a number of instructions for enabling a terminal or network-side device to execute the methods described in each embodiment of the present application.

[0389] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of this application and the scope of protection of the claims. These implementation methods are all within the protection of this application.

Claims

1. A message transmission method, the method comprising: The user equipment UE acquires first information, where the first information is used to indicate a first beam set that can be used for Msg3 retransmission, where the first beam set includes at least one first beam, and the first beam set is different from a second beam set used when Msg3 transmission fails; The UE retransmits Msg3 on the at least one first beam based on the first information; or, The UE acquires first information, where the first information is used to indicate a beam set for repeated transmission of Msg3, where the beam set for repeated transmission of Msg3 includes at least one beam; Based on the first information, the UE repeatedly transmits Msg3 on the at least one beam, and the number of repetitions of the Msg3 repeated transmission is greater than or equal to 1.

2. The method according to claim 1, wherein: The first beam set is a subset of the second beam set; or, At least one beam in the first set of beams is different from a beam in the second set of beams.

3. The method according to claim 1, wherein: The first information includes at least one of the following: A beam switching indication, where the beam switching indication is used to determine whether to switch the beam when Msg3 is retransmitted; The first beam set or a beam set identifier of the first beam set; The beam identifier of the beam used for MGS3 retransmission or repeated transmission; Beam indication information, where the beam indication information is used to indicate a beam that can be used for retransmission or repeated transmission of Msg3; first indication information, where the first indication information indicates at least one beam that can be used for the i-th Msg3 retransmission, where i is a positive integer; The second indication information indicates that the transmission mode of Msg3 when it is retransmitted is repeated transmission of Msg3.

4. The method according to claim 3, wherein: The second indication information includes at least one of the following: Msg3 repeats the transmission of available beams; The number of beams that can be used for Msg3 repeated transmission; The number of times Msg3 is transmitted repeatedly; The number of packets when Msg3 is transmitted repeatedly.

5. The method according to claim 3, wherein: The first beam set includes the beam indicated by the beam indication information; The beam indication information includes at least one of the following: Physical random access channel PRACH index; The downlink synchronization signal block index corresponding to the preamble, or the downlink synchronization signal block index corresponding to the PRACH; The packet sequence number of the PRACH repeated transmission; Msg3: The packet sequence number of the historical repeated transmission.

6. The method according to claim 3, wherein: The beam indication information includes at least one of the following: a binary sequence, a bitmap; The first information includes the first beam set and the beam indication information; The UE retransmits Msg3 on the at least one first beam based on the first information, including: The UE determines, based on the beam indication information, the at least one first beam from the first beam set; The UE retransmits Msg3 on the at least one first beam.

7. The method according to claim 3, wherein: The beam indication information includes at least one of the following: a binary sequence, a bitmap; Before the UE acquires the first information, the method further includes: The UE receives a third beam set from the network side device, where the third beam set includes a beam used for successful transmission of Msg1; The UE retransmits Msg3 on the at least one first beam based on the first information, including: The UE determines, based on the beam indication information, the at least one first beam from the third beam set; The UE retransmits Msg3 on the at least one first beam.

8. The method according to claim 1, wherein: The UE acquires first information, including: The UE receives first information from a network side device.

9. The method according to claim 1, wherein: The UE acquires first information, including: The UE determines the first information according to the beam information used for transmission of Msg1 and the first rule; Among them, the first rule includes a first association relationship between the beam information used for the Msg1 transmission and the beam information that can be used for the Msg3 retransmission.

10. The method according to claim 9, wherein: The first association relationship is determined based on at least one of the following: The order of beams used in Msg1 transmission; The size order of the unique identification ID of the preamble code corresponding to the beam used in Msg1 transmission; The order of physical random access opportunity RO resources corresponding to the beam used when Msg1 is transmitted.

11. The method according to claim 1, wherein: The UE acquires first information, including: The UE determines the first information according to beam information historically transmitted in Msg3 and a second rule; Among them, the second rule includes the second association relationship between the beam information used for the historical transmission of Msg3 and the beam information that can be used for the retransmission of Msg3.

12. The method according to claim 11, wherein: The second association relationship is determined based on the order of beams used in the historical transmission of Msg3.

13. The method according to any one of claims 1 to 12, wherein: After the UE acquires the first information, the method further includes: The UE acquires power information, where the power information is used to indicate a transmit power for retransmitting Msg3; The UE retransmits Msg3 on at least one first beam according to the first information and the transmit power.

14. The method according to claim 13, wherein: The UE obtains power information, including: The UE receives the power information from the network side device; or, The UE determines the power information according to the power information transmitted by Msg1 and the beam information of the at least one first beam; or, The UE determines the power information based on the power information of the historical transmission of Msg3 and the beam information of the at least one first beam.

15. A message transmission method, the method comprising: The network side device sends first information to the UE, where the first information is used to indicate a first beam set that can be used for Msg3 retransmission, where the first beam set includes at least one first beam, and the first beam set is different from the second beam set used when Msg3 transmission fails; or, The network side device sends first information to the UE, where the first information is used to indicate a beam set for repeated transmission of Msg3, where the beam set for repeated transmission of Msg3 includes at least one beam, and the number of repetitions of repeated transmission of Msg3 is greater than or equal to 1.

16. The method according to claim 15, wherein: The first beam set is a subset of the second beam set; or, At least one beam in the first set of beams is different from a beam in the second set of beams.

17. The method according to claim 15, wherein: The first information includes at least one of the following: A beam switching indication, where the beam switching indication is used to determine whether to switch the beam when Msg3 is retransmitted; The first beam set or a beam set identifier of the first beam set; The beam identifier of the beam used for MGS3 retransmission or repeated transmission; Beam indication information, where the beam indication information is used to indicate a beam that can be used for retransmission or repeated transmission of Msg3; first indication information, where the first indication information indicates at least one beam that can be used for the i-th Msg3 retransmission, where i is a positive integer; The second indication information indicates that the transmission mode of Msg3 when it is retransmitted is repeated transmission of Msg3.

18. The method according to claim 17, wherein: The second indication information includes at least one of the following: Msg3 repeats the transmission of available beams; The number of beams that can be used for Msg3 repeated transmission; The number of times Msg3 is transmitted repeatedly; The number of packets when Msg3 is transmitted repeatedly.

19. The method according to claim 17, wherein: The first beam set includes the beam indicated by the beam indication information; The beam indication information includes at least one of the following: PRACH index; The downlink synchronization signal block index corresponding to the preamble, or the downlink synchronization signal block index corresponding to the PRACH; The packet sequence number of the PRACH repeated transmission; Msg3 historical repeated transmission packet sequence number; Binary sequence; Bitmap.

20. The method according to claim 17, wherein: The beam indication information includes at least one of the following: a binary sequence, a bitmap; Before the network side device sends the first information to the UE, the method further includes: The network side device sends a third beam set to the UE, where the third beam set includes the beam used for successful transmission of Msg1.

21. The method according to any one of claims 15 to 20, wherein: After the network side device sends the first information to the UE, the method further includes: The network side device sends power information to the UE, where the power information is used to indicate the transmission power of the retransmission of Msg3.

22. A message transmission device, comprising: Get module and send module; The acquisition module is used to acquire first information, where the first information is used to indicate a first beam set that can be used for Msg3 retransmission, where the first beam set includes at least one first beam, and the first beam set is different from a second beam set used when Msg3 transmission fails; The sending module is configured to retransmit Msg3 on the at least one first beam based on the first information acquired by the acquiring module; or The acquisition module is used to acquire first information, where the first information is used to indicate a beam set for repeated transmission of Msg3, where the beam set for repeated transmission of Msg3 includes at least one beam; The sending module is used to repeatedly transmit Msg3 on the at least one beam based on the first information acquired by the acquisition module, and the number of repetitions of the repeated transmission of Msg3 is greater than or equal to 1.

23. The device according to claim 22, wherein: The first beam set is a subset of the second beam set; or, At least one beam in the first set of beams is different from a beam in the second set of beams.

24. The device according to claim 22, wherein: The first information includes at least one of the following: A beam switching indication, where the beam switching indication is used to determine whether to switch the beam when Msg3 is retransmitted; The first beam set or a beam set identifier of the first beam set; The beam identifier of the beam used for MGS3 retransmission or repeated transmission; Beam indication information, where the beam indication information is used to indicate a beam that can be used for retransmission or repeated transmission of Msg3; first indication information, where the first indication information indicates at least one beam that can be used for the i-th Msg3 retransmission, where i is a positive integer; The second indication information indicates that the transmission mode of Msg3 when it is retransmitted is repeated transmission of Msg3.

25. The device according to claim 24, wherein: The second indication information includes at least one of the following: Msg3 repeats the transmission of available beams; The number of beams that can be used for Msg3 repeated transmission; The number of times Msg3 is transmitted repeatedly; The number of packets when Msg3 is transmitted repeatedly.

26. The device according to claim 24, wherein: The first beam set includes the beam indicated by the beam indication information; The beam indication information includes at least one of the following: Physical random access channel PRACH index; The downlink synchronization signal block index corresponding to the preamble, or the downlink synchronization signal block index corresponding to the PRACH; The packet sequence number of the PRACH repeated transmission; Msg3: The packet sequence number of the historical repeated transmission.

27. The device according to claim 24, wherein: The device further comprises: a determination module; the beam indication information comprises at least one of the following: a binary sequence, a bitmap; The first information includes the first beam set and the beam indication information; The determining module is configured to determine the at least one first beam from the first beam set based on the beam indication information; The sending module is specifically configured to retransmit Msg3 on the at least one first beam.

28. The device according to claim 24, wherein: The device further comprises: a receiving module; The beam indication information includes at least one of the following: a binary sequence, a bitmap; The receiving module is configured to receive a third beam set from the network side device before the first information of the acquiring module is received, wherein the third beam set includes a beam used for successful transmission of Msg1; The determination module is further configured to determine the at least one first beam from a third beam set based on the beam indication information; The sending module is specifically configured to retransmit Msg3 on the at least one first beam.

29. The device according to claim 22, wherein: The acquisition module is specifically used to receive the first information from the network side device.

30. The device according to claim 22, wherein: The acquisition module is specifically configured to determine the first information according to the beam information used for Msg1 transmission and the first rule; Among them, the first rule includes a first association relationship between the beam information used for the Msg1 transmission and the beam information that can be used for the Msg3 retransmission.

31. The device according to claim 30, wherein The first association relationship is determined based on at least one of the following: The order of beams used in Msg1 transmission; The size order of the unique identification ID of the preamble code corresponding to the beam used in Msg1 transmission; The order of physical random access opportunity RO resources corresponding to the beam used when Msg1 is transmitted.

32. The device according to claim 22, wherein: The acquisition module is specifically configured to determine the first information according to the beam information of the historical transmission of Msg3 and the second rule; Among them, the second rule includes the second association relationship between the beam information used for the historical transmission of Msg3 and the beam information that can be used for the retransmission of Msg3.

33. The device according to claim 32, wherein: The second association relationship is determined based on the order of beams used in the historical transmission of Msg3.

34. The device according to any one of claims 22 to 33, wherein: The acquisition module is further used to acquire power information, where the power information is used to indicate the transmission power of the retransmission of Msg3; The sending module is specifically used to retransmit Msg3 on at least one first beam according to the first information and the sending power.

35. The device according to claim 34, wherein The acquisition module is specifically used for: The UE receives the power information from the network side device; or, The UE determines the power information according to the power information transmitted by Msg1 and the beam information of the at least one first beam; or, The UE determines the power information based on the power information of the historical transmission of Msg3 and the beam information of the at least one first beam.

36. A message transmission device, the device comprising: Send module; The sending module is used to send first information to the UE, where the first information is used to indicate a first beam set that can be used for Msg3 retransmission, where the first beam set includes at least one first beam, and the first beam set is different from a second beam set used for Msg3 transmission failure; or, The sending module is used to send first information to the UE, where the first information is used to indicate a beam set for repeated transmission of Msg3, where the beam set for repeated transmission of Msg3 includes at least one beam, and the number of repetitions of the repeated transmission of Msg3 is greater than or equal to 1.

37. The device according to claim 36, wherein The first beam set is a subset of the second beam set; or, At least one beam in the first set of beams is different from a beam in the second set of beams.

38. The device according to claim 36, wherein The first information includes at least one of the following: A beam switching indication, where the beam switching indication is used to determine whether to switch the beam when Msg3 is retransmitted; The first beam set or a beam set identifier of the first beam set; The beam identifier of the beam used for MGS3 retransmission or repeated transmission; Beam indication information, where the beam indication information is used to indicate a beam that can be used for retransmission or repeated transmission of Msg3; first indication information, where the first indication information indicates at least one beam that can be used for the i-th Msg3 retransmission, where i is a positive integer; The second indication information indicates that the transmission mode of Msg3 when it is retransmitted is repeated transmission of Msg3.

39. The device according to claim 38, wherein The second indication information includes at least one of the following: Msg3 repeats the transmission of available beams; The number of beams that can be used for Msg3 repeated transmission; The number of times Msg3 is transmitted repeatedly; The number of packets when Msg3 is transmitted repeatedly.

40. The apparatus of claim 38, wherein: The first beam set includes the beam indicated by the beam indication information; The beam indication information includes at least one of the following: PRACH index; The downlink synchronization signal block index corresponding to the preamble, or the downlink synchronization signal block index corresponding to the PRACH; The packet sequence number of the PRACH repeated transmission; Msg3 historical repeated transmission packet sequence number; Binary sequence; Bitmap.

41. The apparatus of claim 38, wherein: The beam indication information includes at least one of the following: a binary sequence, a bitmap; The sending module is further used to send a third beam set to the UE before sending the first information to the UE, and the third beam set includes the beam used for successful transmission of Msg1.

42. The device according to any one of claims 36 to 41, wherein: The sending module is further used to send power information to the UE after sending the first information to the UE, where the power information is used to indicate the sending power of the retransmission of Msg3.

43. A UE, comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the message transmission method according to any one of claims 1 to 14 are implemented.

44. A network side device, comprising a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the message transmission method as described in any one of claims 15 to 21 are implemented.

45. A readable storage medium storing a program or instruction, wherein the program or instruction, when executed by a processor, implements the message transmission method as described in any one of claims 1 to 14, or implements the steps of the message transmission method as described in any one of claims 15 to 21.

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