Prach repetition transmission method, terminal and network side device

Abstract

The application discloses a PRACH repeated transmission method, a terminal and a network side device, and belongs to the technical field of communication. The PRACH repeated transmission method comprises the following steps: a terminal receives a physical downlink control channel (PDCCH); the terminal performs PRACH repeated transmission according to the PDCCH; wherein the PDCCH comprises at least one of the following: first indication information for instructing the terminal to perform PRACH repeated transmission; and second indication information for determining a random access transmission opportunity (RO) resource; wherein the RO resource is used for the PRACH repeated transmission.

Description

Technical Field

[0001] This application belongs to the field of communication technology, specifically relating to a PRACH repeat transmission method, a terminal, and a network-side device. Background Technology

[0002] Among the methods of transmitting Physical Random-access Channel (PRACH), PRACH retransmission is a way to improve PRACH coverage. Given that PRACH retransmission is supported, how to implement PRACH retransmission needs to be addressed. Summary of the Invention

[0003] This application provides a PRACH repeat transmission method, a terminal, and a network-side device, which can solve the problem of how to implement PRACH repeat transmission.

[0004] Firstly, a PRACH retransmission method is provided for application in a terminal, the method comprising:

[0005] The terminal receives the Physical Downlink Control Channel (PDCCH).

[0006] The terminal performs repeated transmission of the Physical Random Access Channel (PRACH) based on the PDCCH.

[0007] The PDCCH includes at least one of the following:

[0008] First indication information used to instruct the terminal to perform repeated PRACH transmissions;

[0009] Second indication information used to determine random access transport opportunity (RO) resources;

[0010] The random access transport opportunity (RO) resources are used for repeated PRACH transmissions.

[0011] Secondly, a PRACH retransmission method is provided for application in network-side devices. This method includes:

[0012] Network-side devices send Physical Downlink Control Channel (PDCCH) to the terminal;

[0013] The PDCCH includes at least one of the following:

[0014] First indication information used to instruct the terminal to perform repeated PRACH transmissions;

[0015] Second indication information used to determine random access transport opportunity (RO) resources;

[0016] The random access transport opportunity (RO) resources are used for repeated PRACH transmissions.

[0017] Thirdly, a PRACH repeating device is provided, the device comprising:

[0018] The first receiving unit is used to receive the Physical Downlink Control Channel (PDCCH).

[0019] The first processing unit is used to perform repeated transmission of the Physical Random Access Channel (PRACH) according to the PDCCH.

[0020] The PDCCH includes at least one of the following:

[0021] First indication information used to instruct the terminal to perform repeated PRACH transmissions;

[0022] Second indication information used to determine random access transport opportunity (RO) resources;

[0023] The random access transport opportunity (RO) resources are used for repeated PRACH transmissions.

[0024] Fourthly, a PRACH repeating device is provided, the device comprising:

[0025] The first transmitting unit is used to transmit the Physical Downlink Control Channel (PDCCH) to the terminal;

[0026] The PDCCH includes at least one of the following:

[0027] First indication information used to instruct the terminal to perform repeated PRACH transmissions;

[0028] Second indication information used to determine random access transport opportunity (RO) resources;

[0029] The random access transport opportunity (RO) resources are used for repeated PRACH transmissions.

[0030] Fifthly, a terminal is provided, the terminal including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the PRACH repeat transmission method as described in the first aspect.

[0031] In a sixth aspect, a terminal is provided, including a processor and a communication interface, wherein the communication interface is used to receive a Physical Downlink Control Channel (PDCCH), and the processor is used to perform repeated transmissions of a Physical Random Access Channel (PRACH) according to the PDCCH; wherein the PDCCH includes at least one of the following: first indication information for instructing the terminal to perform repeated PRACH transmissions; and second indication information for determining random access transmission opportunity (RO) resources; wherein the random access transmission opportunity (RO) resources are used for the repeated PRACH transmissions.

[0032] In a seventh aspect, a network-side device is provided, the network-side device including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the PRACH repeat transmission method as described in the second aspect.

[0033] Eighthly, a network-side device is provided, including a processor and a communication interface, wherein the communication interface is used to send a Physical Downlink Control Channel (PDCCH) to a terminal; wherein the PDCCH includes at least one of the following: first indication information for instructing the terminal to perform PRACH retransmission; and second indication information for determining random access transmission opportunity (RO) resources; wherein the random access transmission opportunity (RO) resources are used for the PRACH retransmission.

[0034] In a ninth aspect, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the PRACH repeat transfer method as described in the first aspect, or implement the steps of the PRACH repeat transfer method as described in the second aspect.

[0035] In a tenth aspect, a chip is provided, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to run a program or instructions to implement the PRACH repeat transmission method as described in the first aspect, or to implement the PRACH repeat transmission method as described in the second aspect.

[0036] Eleventhly, a computer program / program product is provided, the computer program / program product being stored in a non-transient storage medium, the program / program product being executed by at least one processor to implement the steps of the PRACH repeat transmission method as described in the first aspect, or to implement the PRACH repeat transmission method as described in the second aspect.

[0037] In this embodiment, PRACH retransmission information is determined based on the received PDCCH, and PRACH retransmission is performed. This can achieve PRACH retransmission triggered by PDCCH, thereby optimizing the random access procedure. Attached Figure Description

[0038] Figure 1 This is a structural diagram of a wireless communication system applicable to the embodiments of this application;

[0039] Figure 2 This is one of the diagrams illustrating the relationship between RO and SSB;

[0040] Figure 3 This is the second diagram illustrating the relationship between RO and SSB.

[0041] Figure 4 One of the flowcharts of the PRACH repeat transmission method provided in the embodiments of this application;

[0042] Figure 5 A second schematic flowchart of the PRACH repeat transmission method provided in the embodiments of this application;

[0043] Figure 6 One of the structural schematic diagrams of the PRACH repeat transmission device provided in the embodiments of this application;

[0044] Figure 7 A second schematic diagram of the structure of the PRACH repeat transmission device provided in the embodiments of this application;

[0045] Figure 8 This is a schematic diagram of the structure of a communication device provided in an embodiment of this application;

[0046] Figure 9 A schematic diagram of the hardware structure of a terminal to implement an embodiment of this application;

[0047] Figure 10 This is a schematic diagram of the network-side device provided in an embodiment of this application. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0049] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0050] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, 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), and other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description; however, these technologies can also be applied to applications other than NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0051] Figure 1This diagram illustrates a structural diagram of a wireless communication system applicable to embodiments of this application. The wireless communication system includes a terminal 11 and a network-side device 12. In this context, terminal 11 can also be referred to as a terminal device or user equipment (UE). Terminal 11 can be a mobile phone, tablet computer, laptop computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, vehicle-mounted device (VUE), pedestrian terminal (PUE), smart home (home devices with wireless communication functions, such as refrigerators, televisions, washing machines, or furniture), etc. Wearable devices include: smartwatches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart chains, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, game consoles, etc. It should be noted that the specific type of terminal 11 is not limited in this application embodiment. Network-side device 12 can be a base station or a core network. The base station can be referred to as a node B, evolved node B, access point, base transceiver station (BTS), radio base station, radio transceiver, basic service set (BSS), extended service set (ESS), B node, evolved B node (eNB), home B node, home evolved B node, WLAN access point, WiFi node, transmitting and receiving point (TRP), or any other suitable term in the field, as long as the same technical effect is achieved. The base station is not limited to specific technical terms. It should be noted that in this application embodiment, only the base station in the NR system is used as an example, but the specific type of base station is not limited.

[0052] The PRACH repeat transmission method provided in this application will be described in detail below with reference to the accompanying drawings and through some embodiments and application scenarios.

[0053] In the prior art, there are processes that include contention-based random access procedures and non-contention-based random access procedures.

[0054] In the contention-based random access procedure, also known as the 4-step RACH, the UE first sends msg1 to the network-side device, containing the preamble. After detecting the preamble, the network sends msg2, containing the Random Access Response (RAR) message corresponding to the preamble. After receiving msg2, the UE sends msg3 according to the RAR instruction. After receiving msg3, the network sends msg4, containing the contention resolution ID. When the UE receives msg4, the 4-step random access procedure is complete.

[0055] The network includes uplink (UL) grant information in the RAR to indicate MSG3 Physical Uplink Shared Channel (PUSCH) scheduling information, and also includes information such as the Random Access Preamble ID (RAPID), Temporary Cell Radio Network Temporary Identifier (TC-RNTI), and Timing Advance (TA). If the network does not receive the MSG3 PUSCH, it can schedule retransmission of the MSG3 PUSCH in the Physical Downlink Control Channel (PDCCH) scrambled with TC-RNTI.

[0056] In a contention-based random access procedure, different UEs randomly select a preamble for transmission. This means different UEs might select the same preamble on the same resources, triggering a contention-based random access procedure. This situation can be understood as a UE preamble conflict. In this case, different UEs will receive the same RAR (Registered Access Request). At this point, different UEs will transmit the MSG3 PUSCH according to the scheduling information in the RAR UL grant. The network will include a contention resolution ID in the MSG4 (Physical Downlink Shared Channel, PDSCH) and match it with the Common Control Channel (CCCH) Service Data Unit (SDU) transmitted by the UE in the MSG3 PUSCH. If the match is found, the UE considers the contention resolution successful and uses the TC-RNTI as its Cell Radio Network Temporary Identity (C-RNTI). If they do not match, the contention resolution is considered unsuccessful.

[0057] If the contention resolution fails, a new RACH transmission resource is selected, a PRACH transmission is initiated, and another random access attempt is made.

[0058] In NR, a base station can configure multiple Frequency Division Multiplexing (FDM) PRACH transmission occasions (Physical Random Access Channel transmission opportunities, or PRACH occasions) at a single PRACH transmission time domain location; for simplicity, these are referred to as ROs in this application. The number of ROs that can perform FDM on a single time instance can be {1, 2, 4, 8}.

[0059] The random access preamble (RACH preamble) can only be transmitted on the time-domain resources configured by the parameter PRACHConfigurationIndex, and the random access preamble can only be transmitted on the frequency-domain resources configured by the parameter prach-FDM. The PRACH frequency-domain resource n... RA ∈{0, 1, ..., M-1}, where M equals the higher-layer parameter prach-FDM. At initial access, the PRACH frequency domain resource n RA Starting with the lowest frequency RO resource within the initial active uplink bandwidth part, number them in ascending order; otherwise, use the PRACH frequency domain resource n.RA Number the RO resources in ascending order, starting from the lowest frequency within the active uplink bandwidth part.

[0060] In NR, there is an association between the RO (Redirecting Area) and the actual transmitting SSB (SS / PBCH block, Synchronization Signal / Physical Broadcast Channel Block, sometimes simply referred to as SS block). An RO may be associated with multiple SSBs, or multiple SSBs may be associated with one RO. Typically, different SSBs can use different beams for transmission, and the terminal can also use a beam that closely matches the SSB to repeatedly transmit PRACH on the RO of an associated SSB.

[0061] Figure 2 This is one of the diagrams illustrating the relationship between RO and SSB. For example... Figure 2 As shown, the number of ROs in an FDM on a time instance is 8, and the number of SSBs actually transmitted is 4. For example, the corresponding SSBs are SSB#0, SSB#1, SSB#2, and SSB#3, and each SSB is associated with 2 ROs. If the UE sends a PRACH on the RO corresponding to SSB0, then the UE selects one RO from RO#0 and RO#1 to send the PRACH.

[0062] Figure 3 This is the second diagram illustrating the relationship between RO and SSB. (For example...) Figure 3 As shown, an FDM instance has 2 Returning Objects (ROs) and 8 SSBs (Service Blocks) actually transmitted. For example, the corresponding SSBs are SSB#0, SSB#1, ..., SSB#7, with each pair of SSBs associated with one RO. When multiple SSBs share a single RO, the preamble sets associated with these multiple SSBs are different.

[0063] Notice, Figure 2 and Figure 3 The boxes shown are all ROs, and the SSBs marked in the boxes refer to the SSBs associated with that RO.

[0064] Before sending PRACH, the UE first performs resource selection. It first selects the RO corresponding to an SSB whose RSRP is higher than a threshold. If multiple SSBs have an RSRP higher than the threshold, the terminal can choose any one of them. After determining the SSB, if the SSB is associated with multiple ROs, the terminal can choose any one of them to send PRACH. Within the RO, a preamble is randomly selected from the preamble set associated with the SSB for PRACH transmission.

[0065] The format of the PDCCH for network instruction PRACH transmission is shown in Table 1.

[0066] Table 1 indicates the format of the PDCCH for PRACH transmission.

[0067]

[0068]

[0069] The definition of the PRACH mask index is shown in Table 2.

[0070] Table 2 Definition of PRACH Mask Index

[0071]

[0072] When the network triggers a PRACH transmission via PDCCH, it simultaneously indicates the index value of the RO (Redirect Entity) for the PRACH transmission and the index value of the SSB (Security Service Bus) associated with that PRACH. Since an SSB can be associated with a maximum of 8 ROs, a mask can be used to indicate which specific RO the PRACH transmission will take place on, or to indicate that a finite set of ROs, such as odd or even ROs, will be selected for the PRACH transmission.

[0073] The PRACH transmission method triggered by PDCCH order is suitable for scenarios where downlink data arrives but uplink synchronization is lost. While supporting PRACH repetition, it is also necessary to further support PDCCH-ordered PRACH repetition. Therefore, the resources for PRACH repetition and how to determine the index of the SSB associated with each repetition need to be further clarified.

[0074] Figure 4 This is one of the flowcharts illustrating the PRACH retransmission method provided in the embodiments of this application, such as... Figure 4 As shown, the method includes the following steps:

[0075] Step 400: The terminal receives the Physical Downlink Control Channel (PDCCH).

[0076] The PDCCH includes at least one of the following:

[0077] First indication information used to instruct the terminal to perform repeated PRACH transmissions;

[0078] Second indication information used to determine random access transport opportunity (RO) resources;

[0079] The random access transport opportunity (RO) resources are used for repeated PRACH transmissions.

[0080] Step 401: The terminal performs repeated transmission of the Physical Random Access Channel (PRACH) according to the PDCCH.

[0081] In this embodiment of the application, repeated transmission of PRACH can also be understood as performing multiple PRACH transmissions on multiple RO resources, and the PRACH preamble used in the multiple transmissions can be the same or different.

[0082] The terminal performs repeated transmissions of the Physical Random Access Channel (PRACH) based on the PDCCH, including:

[0083] The terminal determines, based on the first indication information in the PDCCH, that the network-side device has instructed the PRACH to be transmitted repeatedly.

[0084] In other words, if the PDCCH detected by the terminal includes the first indication information, the terminal determines that the network-side device has instructed the terminal to perform PRACH retransmission. If the PDCCH detected by the terminal does not include the first indication information, the terminal determines that the network-side device has not instructed the terminal to perform PRACH retransmission.

[0085] Optionally, the terminal's retransmission of the Physical Random Access Channel (PRACH) based on the PDCCH may further include: the terminal determining the random access transmission opportunity (RO) resource for PRACH retransmission based on the second indication information in the PDCCH.

[0086] Once the resource for PRACH retransmission is determined, the terminal can perform PRACH retransmission on that resource.

[0087] In this embodiment, based on the received PDCCH, the network-side device is instructed to perform PRACH retransmission and the RO resources used for PRACH retransmission, and PRACH retransmission is performed. This can enable PRACH retransmission to be triggered by PDCCH, thereby optimizing the random access process.

[0088] In some embodiments, step 401, where the terminal performs repeated transmission of the Physical Random Access Channel (PRACH) based on the PDCCH, includes at least one of the following:

[0089] The terminal determines, based on the first indication information in the PDCCH, that the network-side device has instructed the PRACH to be transmitted repeatedly.

[0090] When it is determined that the network-side device indicates that PRACH is repeated, the terminal determines the random access transmission opportunity (RO) resource for the repeated PRACH transmission based on the second indication information in the PDCCH.

[0091] In some embodiments, the first indication information includes at least one of the following:

[0092] The index value of the PRACH transmission, which is configured as the preamble index value for performing the PRACH retransmission;

[0093] Uplink (UL) / Supplementary Uplink (SUL) indication field, the UL / SUL indication field being interpreted by the terminal as indicating the PRACH retransmission;

[0094] One or more code points in the PRACH mask index information field, the one or more code points being used to indicate the repeated transmission of the PRACH;

[0095] The first bit field is used to indicate that the PRACH is repeated.

[0096] In one implementation, the terminal determines whether the network-side device instructs the PRACH to be transmitted repeatedly based on the index value of the PRACH transmission.

[0097] When the index value of the PRACH transmission is configured as the preamble index value for PRACH retransmission, the terminal can determine that the PDCCH carries a PRACH retransmission indication, and then the terminal will perform PRACH retransmission.

[0098] The Random Access Preamble index in Table 1 is the index value of the PRACH transmission at this location.

[0099] Optionally, the preamble index value used for PRACH retransmission is configured by the network-side device.

[0100] Optionally, the network-side device is configured with an index value in the first preset range as a preamble index value for repeated PRACH transmission.

[0101] Therefore, when the value of the Random Access Preamble index information field in the PDCCH is within the first preset range, it means that the value is the preamble index value used for PRACH repeated transmission. In other words, it means that the network-side device has indicated PRACH repeated transmission.

[0102] In one implementation, the terminal determines whether the network-side device indicates PRACH retransmission based on the UL / SUL indication field.

[0103] If the UL / SUL indication field is interpreted by the terminal as indicating that the PRACH is being repeated, the terminal determines that the network-side device has indicated that the PRACH is being repeated.

[0104] In other words, the field of the UL / SUL indicator can be reinterpreted as an indication of repeated PRACH transmission.

[0105] For example, in the case of Frequency Range 2 (FR2), SUL will not be deployed, so this field can be reinterpreted as indicating that PRACH is being transmitted repeatedly.

[0106] In one implementation, the terminal determines whether the network-side device indicates that the PRACH should be repeated based on the value of one or more codepoints in the PRACH mask index information field.

[0107] For example, code points with mask index values ​​of 11 to 15 in Table 2 can be used to indicate repeated PRACH transmissions.

[0108] In one implementation, the first field indicates that PRACH is to be transmitted repeatedly.

[0109] The first field is a new bit field.

[0110] For example, the bit field after the PRACH MASK index in Table 1 indicates that PRACH is being transmitted repeatedly; these bits are currently reserved and can be reused.

[0111] This application provides a design scheme for DCI that uses PDCCH to indicate repeated PRACH transmissions, thereby optimizing the random access procedure by triggering repeated PRACH transmissions through PDCCH.

[0112] Furthermore, after the terminal determines that the network-side device indicates that PRACH should be repeatedly transmitted, it can determine the RO resources for PRACH repeated transmission based on the PRACH repeated transmission resource indication in the PDCCH and the RO-related configuration information provided by the network-side device.

[0113] In some embodiments, the second indication information includes at least one of the following:

[0114] The SSB and RO index values ​​of the synchronization signal block associated with PRACH transmission;

[0115] The second bit field is used to indicate the RO set corresponding to the RO resource;

[0116] Target parameters, which are used to indicate the parameters for determining the RO resource.

[0117] This application provides a design scheme for DCI that uses PDCCH to indicate PRACH retransmission resources, thereby optimizing the random access process by triggering PRACH retransmission through PDCCH.

[0118] In some embodiments, the terminal performs repeated transmission of the Physical Random Access Channel (PRACH) based on the PDCCH, including:

[0119] The terminal determines the RO resource corresponding to perform M PRACH repeated transmissions based on the SSB index value and RO index value of the synchronization signal block associated with the PRACH transmission in the PDCCH, where M is a positive integer greater than 1 and is configured by the network-side device.

[0120] Furthermore, based on the SSB index value and RO index value of the synchronization signal block associated with the PRACH transmission in the PDCCH, the RO resources corresponding to M repeated PRACH transmissions are determined in the following ways:

[0121] Method 1:

[0122] The terminal determines the RO resources corresponding to M repeated PRACH transmissions based on the SSB index value and RO index value associated with the PRACH transmission, including:

[0123] The terminal determines the first RO in the RO resource based on the SSB index value and RO index value associated with the PRACH transmission;

[0124] The terminal determines the subsequent ROs of the RO resource based on the first RO.

[0125] Among them, the SSB index value associated with PRACH transmission is the value of SS / PBCH index in Table 1, and the RO index value associated with PRACH transmission is the value of PRACH Mask index in Table 1.

[0126] Based on the SSB index value and RO index value associated with the PRACH transmission, the terminal can determine an RO and use that RO as the first RO in the RO resources corresponding to M repeated PRACH transmissions.

[0127] Then, based on the first RO, determine the subsequent ROs in the RO resources corresponding to the M PRACH retransmissions.

[0128] In some embodiments, the subsequent RO satisfies one of the following:

[0129] (1) The subsequent ROs are M-1 consecutive ROs with the same frequency position as the first RO;

[0130] In other words, the RO resources for the terminal to perform M PRACH retransmissions are multiple consecutive ROs with the same frequency position.

[0131] (2) The subsequent RO is the RO associated with M-1 SSBs sent in order of SSB index value after the SSB associated with the first RO;

[0132] Optionally, the index values ​​of the ROs associated with the M SSBs are also the same.

[0133] For example, if the network indicates RO#0 for SSB#2 and performs M=4 repeated transmissions, and the actual index value of the SSB sent is SSB#0,2,4,5,7, then the RO resources for the PRACH repeated transmissions are ({SSB#0, RO#0}, {SSB#2, RO#0}, {SSB#4, RO#0}, {{SSB#5, RO#0}}).

[0134] (3) The subsequent RO and the first RO belong to the same RO set, wherein the RO set may be configured or predefined by the network-side device and includes multiple ROs;

[0135] It should be noted that an RO set can also be described as other RO resource units, such as an RO group. An RO resource unit contains multiple ROs.

[0136] The RO set / group configured on the network side device includes multiple ROs, which can be associated with the same or different SSBs.

[0137] For example, if the network is configured such that Group X = ({SSB#a, RO#b}, {SSB#c, RO#d}, {SSB#e, RO#f}, {{SSB#g, RO#h}}) belongs to the same RO set / group, and if the PDCCH indicates {SSB#a, RO#b}, then the ROs in group X = ({SSB#a, RO#b}, {SSB#c, RO#d}, {SSB#e, RO#f}, {{SSB#g, RO#h}}) will be used for repeated PRACH transmission.

[0138] In (1)-(3) above, the SSB associated with the repeated transmission of PRACH can be the same or different, which can be understood as using the same or different beams to correspond to the repeated transmission of PRACH.

[0139] (4) The subsequent ROs are M-1 ROs that share the same SSB as the first RO.

[0140] Optionally, these ROs can all have the same index value.

[0141] This scheme corresponds to the same SSB for repeated PRACH transmissions, which can be understood as using the same beam for repeated PRACH transmissions.

[0142] Method 2:

[0143] The terminal determines the RO resources corresponding to M repeated PRACH transmissions based on the SSB index value and RO index value associated with the PRACH transmission, including:

[0144] The terminal determines an RO corresponding to the SSB indicated by the PDCCH based on the SSB index value and RO index value associated with the PRACH transmission.

[0145] The terminal determines the first RO set containing the RO corresponding to the SSB indicated by the PDCCH based on the RO set configured by the network-side device.

[0146] The terminal determines M-1 ROs from the first RO set, and uses one RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs as the RO resources corresponding to the M PRACH repeated transmissions.

[0147] The RO set / group indicated by the network includes multiple ROs, which may be associated with the same or different SSBs.

[0148] If the RO determined by the PDCCH instruction belongs to a certain RO set / group, the terminal will repeatedly transmit PRACH in the multiple ROs contained in that RO set / group.

[0149] At this point, the terminal is not limited to using the RO indicated by the PDCCH as the first RO for repeated PRACH transmission.

[0150] For example, if the network indicates that SSB#2 is associated with RO#2, and the RO set / group configured in the network consists of {(SSB#0, RO#2), {SSB#2, RO#2}, {SSB#4, RO#4}, {SSB#6, RO#4}} as a group of ROs, and {SSB#2, RO#2} belongs to this RO set / group, then the terminal uses multiple RO resources in this group for PRACH retransmission.

[0151] In this embodiment, based on the PRACH retransmission indication in the received PDCCH, it is determined that the network-side device has indicated PRACH retransmission. Furthermore, the RO resource for PRACH retransmission can be determined based on the SSB index value and RO index value associated with PRACH transmission in the PDCCH. This enables PRACH retransmission to be triggered via PDCCH, thereby optimizing the random access process.

[0152] In addition, the terminal can also determine the RO resources used for PRACH retransmission based on the indication of the second bit field in the PDCCH.

[0153] Method 3:

[0154] In some embodiments, the terminal performs repeated transmission of the Physical Random Access Channel (PRACH) based on the PDCCH, including:

[0155] The terminal determines the second RO set from multiple RO sets configured by the network-side device according to the indication of the second bit field;

[0156] The terminal uses multiple ROs from the second RO set as the RO resources.

[0157] Understandably, the network can be configured with a combination of multiple RO sets / groups, each RO set / group including multiple ROs. One of the multiple RO sets / groups is indicated by the second bit field in the PDCCH. The terminal determines an RO set / group based on the indication of the second bit field and performs PRACH retransmission.

[0158] In some embodiments, the second bit field is a code point in the PRACH mask index information field.

[0159] One possible approach is to reuse the PRACH Mask Index field to indicate the RO combination for repeated PRACH transmissions. In other words, the PRACH MASK Index field can be used to indicate one of the RO sets / groups out of a maximum of 16 RO sets / groups for repeated PRACH transmissions.

[0160] This application provides a DCI design scheme for indicating PRACH retransmission resources, which can realize PRACH retransmission triggered by PDCCH, thereby optimizing the random access process.

[0161] Method 4:

[0162] The terminal can also implicitly determine the RO resources for repeated PRACH transmissions based on the target parameters indicated by the PDCCH.

[0163] That is, the terminal performs repeated transmission of the Physical Random Access Channel (PRACH) according to the PDCCH, including:

[0164] The terminal determines the RO resource based on the target parameters;

[0165] The target parameters include one of the following:

[0166] The frequency resource location corresponding to the RO resource;

[0167] The remainder of the RO index value corresponding to the RO resource.

[0168] The terminal determines the RO resource based on the target parameters, including one of the following:

[0169] (1) The terminal determines N ROs with the same frequency resource location according to the frequency resource location indicated by the PDCCH, and uses the N ROs with the same frequency resource location as the RO resources for repeated transmission of the PRACH.

[0170] (2) The terminal determines N RO index values ​​based on the remainder of the RO index values ​​corresponding to the RO resources indicated by the PDCCH. Specifically, the determination method is mod(RO index, P) = Q, where Q is the remainder of the RO index values ​​corresponding to the RO resources indicated by the PDCCH, P can be a preset value or a value configured by the network-side device, and RO index is the index value order of ROs sorted by time and / or frequency. The N ROs corresponding to the N RO index values ​​are used as the RO resources for repeated transmission by the PRACH.

[0171] Where N is a positive integer.

[0172] This application provides another DCI design scheme for indicating PRACH retransmission resources, which can realize PRACH retransmission triggered by PDCCH, thereby optimizing the random access process.

[0173] The PRACH repeat transmission method provided in this application further designs the DCI and introduces a new mechanism for determining PRACH repeat transmission resources. It also supports the mechanism of PDCCH triggering PRACH repeat transmission, which can optimize the random access process.

[0174] Figure 5 This is a second schematic flowchart of the PRACH repeat transmission method provided in an embodiment of this application. Figure 5 As shown, the method includes the following steps:

[0175] Step 500: The network-side device sends the Physical Downlink Control Channel (PDCCH) to the terminal;

[0176] The PDCCH includes at least one of the following:

[0177] First indication information used to instruct the terminal to perform repeated PRACH transmissions;

[0178] Second indication information used to determine random access transport opportunity (RO) resources;

[0179] The random access transport opportunity (RO) resources are used for repeated PRACH transmissions.

[0180] It is understandable that network-side devices can send PDCCHs to terminals, including at least one of PRACH repeat transmission indication and PRACH repeat transmission resource indication, to support PDCCH triggering PRACH repeat transmission.

[0181] The first instruction information is used to instruct the terminal to perform repeated PRACH transmissions.

[0182] The second indication information is used to determine the random access transmission opportunity (RO) resource, that is, the second indication information is used to instruct the terminal to perform PRACH repeated transmissions of the RO resource.

[0183] In this embodiment, a PDCCH is sent to the terminal. The PDCCH includes at least one of a PRACH retransmission indication and a PRACH retransmission resource indication, which enables the terminal to determine the PRACH retransmission information, thereby realizing the PRACH retransmission triggered by the PDCCH and optimizing the random access procedure.

[0184] In some embodiments, the first indication information includes at least one of the following:

[0185] The index value of the PRACH transmission, which is configured as the preamble index value for performing the PRACH retransmission;

[0186] Uplink UL / Supplemental Uplink SUL Indication Field, the UL / SUL indication field is interpreted by the terminal as indicating the PRACH repeated transmission;

[0187] One or more code points in the PRACH mask index information field, the one or more code points being used to indicate the repeated transmission of the PRACH;

[0188] The first bit field is used to indicate that the PRACH is repeated.

[0189] In one implementation, the network-side device uses the index value of the PRACH transmission to indicate that the PRACH should be transmitted repeatedly.

[0190] When the index value of the PRACH transmission is configured as the preamble index value for PRACH retransmission, the terminal can determine that the PDCCH carries a PRACH retransmission indication, and then the terminal will perform PRACH retransmission.

[0191] The Random Access Preamble index in Table 1 is the index value of the PRACH transmission at this location.

[0192] Optionally, the preamble index value used for PRACH retransmission is configured by the network-side device.

[0193] Optionally, the network-side device is configured with an index value in the first preset range as a preamble index value for repeated PRACH transmission.

[0194] Therefore, when the value of the Random Access Preamble index information field in the PDCCH is within the first preset range, it means that the value is the preamble index value used for PRACH repeated transmission. In other words, it means that the network-side device has indicated PRACH repeated transmission.

[0195] In one implementation, the network-side device uses the UL / SUL indication field to indicate repeated PRACH transmissions.

[0196] If the UL / SUL indication field is interpreted by the terminal as indicating that the PRACH is being repeated, the terminal determines that the network-side device has indicated that the PRACH is being repeated.

[0197] In other words, the field of the UL / SUL indicator can be reinterpreted as an indication of repeated PRACH transmission.

[0198] For example, in the case of Frequency Range 2 (FR2), SUL will not be deployed, so this field can be reinterpreted as indicating that PRACH is being transmitted repeatedly.

[0199] In one implementation, one or more codepoints in the PRACH mask index information field of the network-side device indicate repeated PRACH transmission.

[0200] For example, code points with mask index values ​​of 11 to 15 in Table 2 can be used to indicate repeated PRACH transmissions.

[0201] In one implementation, the network-side device uses the first field to indicate that PRACH is transmitted repeatedly.

[0202] The first field is a new bit field.

[0203] For example, the bit field after the PRACH MASK index in Table 1 indicates that PRACH is being transmitted repeatedly; these bits are currently reserved and can be reused.

[0204] This application provides a design scheme for DCI that uses PDCCH to indicate repeated PRACH transmissions, thereby optimizing the random access procedure by triggering repeated PRACH transmissions through PDCCH.

[0205] In some embodiments, the second indication information includes at least one of the following:

[0206] The SSB and RO index values ​​of the synchronization signal block associated with PRACH transmission;

[0207] The second bit field is used to indicate the RO set corresponding to the RO resource;

[0208] Target parameters, which are used to indicate the parameters for determining the RO resource.

[0209] This application provides a design scheme for DCI that uses PDCCH to indicate PRACH retransmission resources, thereby optimizing the random access process by triggering PRACH retransmission through PDCCH.

[0210] Optionally, the terminal determines the RO resource corresponding to perform M repeated PRACH transmissions based on the SSB index value and RO index value of the synchronization signal block associated with the PRACH transmission in the PDCCH.

[0211] In one implementation, the terminal determines the first RO in the RO resource based on the SSB index value and RO index value associated with the PRACH transmission in the PDCCH; the terminal determines the subsequent ROs of the RO resource based on the first RO.

[0212] In another implementation, the terminal determines an RO corresponding to the SSB indicated by the PDCCH based on the SSB index value and RO index value associated with the PRACH transmission in the PDCCH; then, based on the RO set configured by the network-side device, it determines a first RO set containing the RO corresponding to the SSB indicated by the PDCCH, determines M-1 ROs from the first RO set, and uses the RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs as the RO resources corresponding to the M repeated PRACH transmissions.

[0213] Optionally, the terminal determines a second RO set from multiple RO sets configured by the network-side device according to the indication of the second bit field, and uses multiple ROs in the second RO set as RO resources for repeated PRACH transmission.

[0214] Optionally, the terminal implicitly determines the RO resources for repeated PRACH transmissions based on the target parameters indicated by the PDCCH.

[0215] This application provides a DCI design scheme for indicating PRACH retransmission resources, which can realize PRACH retransmission triggered by PDCCH, thereby optimizing the random access process.

[0216] It should be noted that when the terminal determines the RO resources corresponding to the PRACH repeated transmission through the above methods, it needs to combine the RO set information configured by the network-side device.

[0217] Therefore, in some embodiments, the method further includes:

[0218] Send at least one RO set information to the terminal, the RO set information being used to indicate the RO set in which the terminal can use RO resources for PRACH retransmission.

[0219] In some embodiments, the second bit field is a code point in the PRACH mask index information field.

[0220] At this time, the network-side device can reuse the PRACH Mask Index field to indicate the RO combination for PRACH retransmission. In other words, the network-side device can use the PRACH MASK Index field to indicate one of the RO sets / groups out of up to 16 RO sets / groups for PRACH retransmission.

[0221] In some embodiments, the target parameter includes one of the following:

[0222] The frequency resource location corresponding to the RO resource;

[0223] The remainder of the RO index value corresponding to the RO resource.

[0224] The PRACH repeat transmission method provided in this application further designs the DCI and introduces a new mechanism for determining PRACH repeat transmission resources. It also supports the mechanism of PDCCH triggering PRACH repeat transmission, which can optimize the random access process.

[0225] It should be noted that the PRACH repeat transmission method provided in this application embodiment can be executed by a PRACH repeat transmission device, or by a control module in the PRACH repeat transmission device for executing the PRACH repeat transmission method. This application embodiment uses the execution of the PRACH repeat transmission method by a PRACH repeat transmission device as an example to illustrate the PRACH repeat transmission device provided in this application embodiment.

[0226] Figure 6 This is one of the structural schematic diagrams of the PRACH repeat transmission device provided in the embodiments of this application, such as... Figure 6 As shown, the PRACH repeat transmission device 600 includes:

[0227] The first receiving unit 610 is used to receive the physical downlink control channel (PDCCH).

[0228] The first processing unit 620 is used to perform repeated transmission of the Physical Random Access Channel (PRACH) according to the PDCCH.

[0229] The PDCCH includes at least one of the following:

[0230] First indication information used to instruct the terminal to perform repeated PRACH transmissions;

[0231] Second indication information used to determine random access transport opportunity (RO) resources;

[0232] The random access transport opportunity (RO) resources are used for repeated PRACH transmissions.

[0233] In this embodiment, PRACH is repeatedly transmitted based on the received PDCCH, which can trigger PRACH repeated transmission through PDCCH, thereby optimizing the random access procedure.

[0234] Optionally, the first indication information includes at least one of the following:

[0235] The index value of the PRACH transmission, which is configured as the preamble index value for performing the PRACH retransmission;

[0236] Uplink UL / Supplemental Uplink SUL Indication Field, the UL / SUL indication field is interpreted by the terminal as indicating the PRACH repeated transmission;

[0237] One or more code points in the PRACH mask index information field, the one or more code points being used to indicate the repeated transmission of the PRACH;

[0238] The first bit field is used to indicate that the PRACH is repeated.

[0239] This application provides a design scheme for DCI that uses PDCCH to indicate repeated PRACH transmissions, thereby optimizing the random access procedure by triggering repeated PRACH transmissions through PDCCH.

[0240] Optionally, the second indication information includes at least one of the following:

[0241] The SSB and RO index values ​​of the synchronization signal block associated with PRACH transmission;

[0242] The second bit field is used to indicate the RO set corresponding to the RO resource;

[0243] Target parameters, which are used to indicate the parameters for determining the RO resource.

[0244] This application provides a design scheme for DCI that uses PDCCH to indicate PRACH retransmission resources, thereby optimizing the random access process by triggering PRACH retransmission through PDCCH.

[0245] Optionally, the step of performing repeated transmission of the Physical Random Access Channel (PRACH) based on the PDCCH includes:

[0246] Based on the SSB index value and RO index value associated with the PRACH transmission, the RO resources corresponding to M repeated PRACH transmissions are determined, where M is a positive integer greater than 1, and M is configured by the network-side device.

[0247] Optionally, determining the RO resource corresponding to M repeated PRACH transmissions based on the SSB index value and RO index value associated with the PRACH transmission includes:

[0248] The first RO in the RO resource is determined based on the SSB index value and RO index value associated with the PRACH transmission;

[0249] Based on the first RO, determine the subsequent ROs of the RO resource.

[0250] Optionally, the subsequent RO satisfies one of the following:

[0251] The subsequent ROs are M-1 consecutive ROs with the same frequency position as the first RO;

[0252] The subsequent ROs are the M-1 ROs associated with SSBs sent sequentially according to their SSB index values ​​after the SSB associated with the first RO.

[0253] The subsequent RO and the first RO belong to the same RO set, wherein the RO set may be configured or predefined by the network-side device and includes multiple ROs;

[0254] The subsequent ROs are M-1 ROs that share the same SSB as the first RO.

[0255] Optionally, determining the RO resource corresponding to M repeated PRACH transmissions based on the SSB index value and RO index value associated with the PRACH transmission includes:

[0256] Based on the SSB index value and RO index value associated with the PRACH transmission, determine an RO corresponding to the SSB indicated by the PDCCH;

[0257] Based on the RO set configured by the network-side device, determine the first RO set where the RO corresponding to the SSB indicated by the PDCCH is located;

[0258] M-1 ROs are determined from the first RO set, and one RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs are used as the RO resources corresponding to the M PRACH repeated transmissions.

[0259] In this embodiment, based on the PRACH retransmission indication in the received PDCCH, it is determined that the network-side device has indicated PRACH retransmission. Furthermore, the RO resource for PRACH retransmission can be determined based on the SSB index value and RO index value associated with PRACH transmission in the PDCCH. This enables PRACH retransmission to be triggered via PDCCH, thereby optimizing the random access process.

[0260] Optionally, the step of performing repeated transmission of the Physical Random Access Channel (PRACH) based on the PDCCH includes:

[0261] Based on the indication of the second bit field, a second RO set is determined from multiple RO sets configured on the network-side device;

[0262] Multiple ROs in the second RO set are used as the RO resources.

[0263] Optionally, the second bit field is a code point in the PRACH mask index information field.

[0264] This application provides a DCI design scheme for indicating PRACH retransmission resources, which can realize PRACH retransmission triggered by PDCCH, thereby optimizing the random access process.

[0265] Optionally, the step of performing repeated transmission of the Physical Random Access Channel (PRACH) based on the PDCCH includes:

[0266] The RO resources are determined based on the target parameters;

[0267] The target parameters include one of the following:

[0268] The frequency resource location corresponding to the RO resource;

[0269] The remainder of the RO index value corresponding to the RO resource.

[0270] Optionally, determining the RO resource based on the target parameter includes one of the following:

[0271] Based on the frequency resource location corresponding to the RO resource, determine N ROs with the same frequency resource location, and use the N ROs with the same frequency resource location as the RO resources for repeated PRACH transmission;

[0272] Based on the remainder of the RO index value corresponding to the RO resource, determine N RO index values, and use the N RO corresponding to the N RO index values ​​as the RO resources for repeated PRACH transmission;

[0273] Where N is a positive integer.

[0274] This application provides another DCI design scheme for indicating PRACH retransmission resources, which can realize PRACH retransmission triggered by PDCCH, thereby optimizing the random access process.

[0275] The PRACH repeat transmission device provided in this application embodiment further designs the DCI and introduces a new mechanism for determining PRACH repeat transmission resources, supports the mechanism of PDCCH triggering PRACH repeat transmission, and can optimize the random access process.

[0276] The PRACH repeat transmission device in this application embodiment can be a device, a device or electronic device with an operating system, or a component, integrated circuit, or chip in a terminal. The device or electronic device can be a mobile terminal or a non-mobile terminal. For example, a mobile terminal can include, but is not limited to, the types of terminals 11 listed above, while a non-mobile terminal can be a server, network attached storage (NAS), personal computer (PC), television (TV), ATM, or self-service machine, etc. This application embodiment does not specifically limit the type of terminal.

[0277] The PRACH repeat transfer device provided in this application embodiment can achieve Figure 4 The various processes implemented in the method embodiments achieve the same technical effect, and will not be described again here to avoid repetition.

[0278] Figure 7 This is a second schematic diagram of the structure of the PRACH repeat transmission device provided in the embodiments of this application, as shown below. Figure 7 As shown, the PRACH repeat transmission device 700 includes:

[0279] The first transmitting unit 710 is used to transmit the physical downlink control channel (PDCCH) to the terminal.

[0280] The PDCCH includes at least one of the following:

[0281] First indication information used to instruct the terminal to perform repeated PRACH transmissions;

[0282] Second indication information used to determine random access transport opportunity (RO) resources;

[0283] The random access transport opportunity (RO) resources are used for repeated PRACH transmissions.

[0284] In this embodiment, a PDCCH is sent to the terminal. The PDCCH includes at least one of a PRACH retransmission indication and a PRACH retransmission resource indication, which enables the terminal to determine the PRACH retransmission information, thereby realizing the PRACH retransmission triggered by the PDCCH and optimizing the random access procedure.

[0285] Optionally, the first indication information includes at least one of the following:

[0286] The index value of the PRACH transmission, which is configured as the preamble index value for performing the PRACH retransmission;

[0287] Uplink UL / Supplemental Uplink SUL Indication Field, the UL / SUL indication field is interpreted by the terminal as indicating the PRACH repeated transmission;

[0288] One or more code points in the PRACH mask index information field, the one or more code points being used to indicate the repeated transmission of the PRACH;

[0289] The first bit field is used to indicate that the PRACH is repeated.

[0290] This application provides a design scheme for DCI that uses PDCCH to indicate repeated PRACH transmissions, thereby optimizing the random access procedure by triggering repeated PRACH transmissions through PDCCH.

[0291] Optionally, the second indication information includes at least one of the following:

[0292] The SSB and RO index values ​​of the synchronization signal block associated with PRACH transmission;

[0293] The second bit field is used to indicate the RO set corresponding to the RO resource;

[0294] Target parameters, which are used to indicate the parameters for determining the RO resource.

[0295] This application provides a DCI design scheme for indicating PRACH retransmission resources, which can realize PRACH retransmission triggered by PDCCH, thereby optimizing the random access process.

[0296] Optionally, the device further includes:

[0297] The second sending unit is used to send at least one RO set information to the terminal, the RO set information being used to indicate the RO set in which the terminal can use RO resources for PRACH retransmission.

[0298] Optionally, the second bit field is a code point in the PRACH mask index information field.

[0299] Optionally, the target parameter includes one of the following:

[0300] The frequency resource location corresponding to the RO resource;

[0301] The remainder of the RO index value corresponding to the RO resource.

[0302] The PRACH repeat transmission device provided in this application embodiment further designs the DCI and introduces a new mechanism for determining PRACH repeat transmission resources, supports the mechanism of PDCCH triggering PRACH repeat transmission, and can optimize the random access process.

[0303] The PRACH repeat transmission device in the embodiments of this application can be a device, a device with an operating system or a network-side device, or it can be a component, integrated circuit or chip in a network-side device.

[0304] The PRACH repeat transfer device provided in this application embodiment can achieve Figure 5 The various processes implemented in the method embodiments achieve the same technical effect, and will not be described again here to avoid repetition.

[0305] Optional, such as Figure 8 As shown, this application embodiment also provides a communication device 800, including a processor 801, a memory 802, and a program or instructions stored in the memory 802 and executable on the processor 801. For example, when the communication device 800 is a terminal, the program or instructions executed by the processor 801 implement the various processes of the above-described PRACH repeat transmission method embodiment and achieve the same technical effect. When the communication device 800 is a network-side device, the program or instructions executed by the processor 801 implement the various processes of the above-described PRACH repeat transmission method embodiment and achieve the same technical effect; to avoid repetition, further details are omitted here.

[0306] This application embodiment also provides a terminal, including a processor and a communication interface. The communication interface is used to receive a Physical Downlink Control Channel (PDCCH), and the processor is used to perform PRACH retransmission according to the PDCCH. The PDCCH includes at least one of the following: first indication information for instructing the terminal to perform PRACH retransmission; and second indication information for determining a Random Access Transmission Opportunity (RO) resource. The RO resource is used for the PRACH retransmission. This terminal embodiment corresponds to the above-described terminal-side method embodiment. All implementation processes and methods of the above method embodiments can be applied to this terminal embodiment and achieve the same technical effect. Specifically, Figure 9 A schematic diagram of the hardware structure of a terminal to implement an embodiment of this application.

[0307] The terminal 900 includes, but is not limited to, at least some of the following components: radio frequency unit 901, network module 902, audio output unit 903, input unit 904, sensor 905, display unit 906, user input unit 907, interface unit 908, memory 909, and processor 910.

[0308] Those skilled in the art will understand that the terminal 900 may also include a power supply (such as a battery) for supplying power to various components. The power supply may be logically connected to the processor 910 through a power management system, thereby enabling functions such as managing charging, discharging, and power consumption through the power management system. Figure 9 The terminal structure shown does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0309] It should be understood that, in this embodiment, the input unit 904 may include a graphics processing unit (GPU) 9041 and a microphone 9042. The GPU 9041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 906 may include a display panel 9061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 907 includes a touch panel 9071 and other input devices 9072. The touch panel 9071 is also called a touch screen. The touch panel 9071 may include a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0310] In this embodiment, the radio frequency unit 901 receives downlink data from the network-side device and processes it for the processor 910; additionally, it sends uplink data to the network-side device. Typically, the radio frequency unit 901 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc.

[0311] The memory 909 can be used to store software programs or instructions and various data. The memory 909 may primarily include a program or instruction storage area and a data storage area. The program or instruction storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 909 may include high-speed random access memory and non-volatile memory, which may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. For example, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0312] Processor 910 may include one or more processing units; optionally, processor 910 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications or instructions, and the modem processor mainly handles wireless communication, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 910.

[0313] Among them, the radio frequency unit 901 is used to receive the physical downlink control channel (PDCCH);

[0314] Processor 910 is configured to perform repeated transmission of Physical Random Access Channel (PRACH) according to the PDCCH;

[0315] The PDCCH includes at least one of the following:

[0316] First indication information used to instruct the terminal to perform repeated PRACH transmissions;

[0317] Second indication information used to determine random access transport opportunity (RO) resources;

[0318] The random access transport opportunity (RO) resources are used for repeated PRACH transmissions.

[0319] In this embodiment, PRACH is repeatedly transmitted based on the received PDCCH, which can trigger PRACH repeated transmission through PDCCH, thereby optimizing the random access procedure.

[0320] Optionally, the first indication information includes at least one of the following:

[0321] The index value of the PRACH transmission, which is configured as the preamble index value for performing the PRACH retransmission;

[0322] Uplink UL / Supplemental Uplink SUL Indication Field, the UL / SUL indication field is interpreted by the terminal as indicating the PRACH repeated transmission;

[0323] One or more code points in the PRACH mask index information field, the one or more code points being used to indicate the repeated transmission of the PRACH;

[0324] The first bit field is used to indicate that the PRACH is repeated.

[0325] This application provides a design scheme for DCI that uses PDCCH to indicate repeated PRACH transmissions, thereby optimizing the random access procedure by triggering repeated PRACH transmissions through PDCCH.

[0326] Optionally, the second indication information includes at least one of the following:

[0327] The SSB and RO index values ​​of the synchronization signal block associated with PRACH transmission;

[0328] The second bit field is used to indicate the RO set corresponding to the RO resource;

[0329] Target parameters, which are used to indicate the parameters for determining the RO resource.

[0330] Optionally, the processor 910 is also used for:

[0331] Based on the SSB index value and RO index value associated with the PRACH transmission, the RO resources corresponding to M repeated PRACH transmissions are determined, where M is a positive integer greater than 1, and M is configured by the network-side device.

[0332] Optionally, determining the RO resource corresponding to M repeated PRACH transmissions based on the SSB index value and RO index value associated with the PRACH transmission includes:

[0333] The first RO in the RO resource is determined based on the SSB index value and RO index value associated with the PRACH transmission;

[0334] Based on the first RO, determine the subsequent ROs of the RO resource.

[0335] Optionally, the subsequent RO satisfies one of the following:

[0336] The subsequent ROs are M-1 consecutive ROs with the same frequency position as the first RO;

[0337] The subsequent ROs are the M-1 ROs associated with SSBs sent sequentially according to their SSB index values ​​after the SSB associated with the first RO.

[0338] The subsequent RO and the first RO belong to the same RO set, wherein the RO set may be configured or predefined by the network-side device and includes multiple ROs;

[0339] The subsequent ROs are M-1 ROs that share the same SSB as the first RO.

[0340] Optionally, determining the RO resource corresponding to M repeated PRACH transmissions based on the SSB index value and RO index value associated with the PRACH transmission includes:

[0341] Based on the SSB index value and RO index value associated with the PRACH transmission, determine an RO corresponding to the SSB indicated by the PDCCH;

[0342] Based on the RO set configured by the network-side device, determine the first RO set where the RO corresponding to the SSB indicated by the PDCCH is located;

[0343] M-1 ROs are determined from the first RO set, and one RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs are used as the RO resources corresponding to the M PRACH repeated transmissions.

[0344] In this embodiment, the terminal determines that the network-side device has indicated PRACH retransmission based on the PRACH retransmission indication in the received PDCCH, and can determine the RO resource of PRACH retransmission based on the SSB index value and RO index value associated with PRACH transmission in the PDCCH. This enables PRACH retransmission to be triggered through PDCCH, thereby optimizing the random access process.

[0345] Optionally, the processor 910 is also used for:

[0346] Based on the indication of the second bit field, a second RO set is determined from multiple RO sets configured on the network-side device;

[0347] Multiple ROs in the second RO set are used as RO resources for repeated PRACH transmission.

[0348] Optionally, the second bit field is a code point in the PRACH mask index information field.

[0349] This application provides a DCI design scheme for indicating PRACH retransmission resources, which can realize PRACH retransmission triggered by PDCCH, thereby optimizing the random access process.

[0350] Optionally, the processor 910 is also used for:

[0351] The RO resources are determined based on the target parameters;

[0352] The target parameters include one of the following:

[0353] The frequency resource location corresponding to the RO resource;

[0354] The remainder of the RO index value corresponding to the RO resource.

[0355] Optionally, determining the RO resource based on the target parameters includes one of the following:

[0356] Based on the frequency resource location corresponding to the RO resource, determine N ROs with the same frequency resource location, and use the N ROs with the same frequency resource location as the RO resources for repeated PRACH transmission;

[0357] Based on the remainder of the RO index value corresponding to the RO resource, determine N RO index values, and use the N RO corresponding to the N RO index values ​​as the RO resources for repeated PRACH transmission;

[0358] Where N is a positive integer.

[0359] This application provides another DCI design scheme for indicating PRACH retransmission resources, which can realize PRACH retransmission triggered by PDCCH, thereby optimizing the random access process.

[0360] In this embodiment, the DCI is further designed and a new mechanism for determining PRACH retransmission resources is introduced, supporting the mechanism of PDCCH triggering PRACH retransmission, which can optimize the random access process.

[0361] This application also provides a network-side device, including a processor and a communication interface. The communication interface is used to send a Physical Downlink Control Channel (PDCCH) to a terminal. The PDCCH includes at least one of the following: first indication information for instructing the terminal to perform PRACH retransmission; and second indication information for determining a Random Access Transmission Opportunity (RO) resource. The RO resource is used for the PRACH retransmission. This network-side device embodiment corresponds to the above-described network-side device method embodiment. All implementation processes and methods of the above method embodiments can be applied to this network-side device embodiment and achieve the same technical effects.

[0362] Specifically, embodiments of this application also provide a network-side device. For example... Figure 10 As shown, the network-side device 1000 includes: an antenna 1001, a radio frequency (RF) device 1002, and a baseband device 1003. The antenna 1001 is connected to the RF device 1002. In the uplink direction, the RF device 1002 receives information through the antenna 1001 and transmits the received information to the baseband device 1003 for processing. In the downlink direction, the baseband device 1003 processes the information to be transmitted and sends it to the RF device 1002. The RF device 1002 processes the received information and transmits it through the antenna 1001.

[0363] The aforementioned frequency band processing device can be located in the baseband device 1003. The method executed by the network-side device in the above embodiments can be implemented in the baseband device 1003, which includes a processor 1004 and a memory 1005.

[0364] The baseband device 1003 may include, for example, at least one baseband board on which multiple chips are disposed, such as... Figure 10As shown, one of the chips, for example, is a processor 1004, which is connected to a memory 1005 to call the program in the memory 1005 and execute the network-side device operations shown in the above method embodiment.

[0365] The baseband device 1003 may also include a network interface 1006 for exchanging information with the radio frequency device 1002, such as a common public radio interface (CPRI).

[0366] Specifically, the network-side device in this embodiment of the invention further includes: instructions or programs stored in memory 1005 and executable on processor 1004, wherein processor 1004 calls the instructions or programs in memory 1005 to execute... Figure 7 The methods executed by each module shown achieve the same technical effect, and to avoid repetition, they will not be described in detail here.

[0367] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described PRACH repeated transmission method embodiments and achieve the same technical effect. To avoid repetition, further details are omitted here.

[0368] The processor mentioned above is the processor in the terminal described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0369] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described PRACH repeated transmission method embodiment and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0370] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0371] This application also provides a computer program / program product, which is stored in a non-transient storage medium. The program / program product is executed by at least one processor to implement the various processes of the above-described system message reporting method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0372] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0373] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0374] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A method for repeated PRACH transmission, characterized in that, include: The terminal receives the Physical Downlink Control Channel (PDCCH). The terminal performs repeated transmission of the Physical Random Access Channel (PRACH) based on the PDCCH. The PDCCH includes: First indication information used to instruct the terminal to perform repeated PRACH transmissions; Second indication information used to determine random access transport opportunity (RO) resources; Wherein, the Random Access Transport Opportunity (RO) resource is used for the repeated transmission of PRACH; the first indication information includes at least one of the following: The index value of the PRACH transmission, which is configured as the preamble index value for performing the PRACH retransmission; Uplink UL / Supplemental Uplink SUL Indication Field, the UL / SUL indication field being interpreted by the terminal as indicating repeated PRACH transmission; one or more code points in the PRACH Mask Index Information Field, the one or more code points being used to indicate repeated PRACH transmission; The first bit field is used to indicate the repeated transmission of the PRACH; the second indication information includes at least one of the following: The SSB and RO index values ​​of the synchronization signal block associated with PRACH transmission; The second bit field is used to indicate the RO set corresponding to the RO resource; Target parameters, which indicate the parameters for determining the RO resource; the terminal performs repeated transmission of the Physical Random Access Channel (PRACH) according to the PDCCH, including: The terminal determines the RO resources corresponding to M repeated PRACH transmissions based on the SSB index value and RO index value associated with the PRACH transmission, where M is a positive integer greater than 1, and M is configured by the network-side device; the terminal determines the RO resources corresponding to M repeated PRACH transmissions based on the SSB index value and RO index value associated with the PRACH transmission, including: The terminal determines the first RO in the RO resource based on the SSB index value and RO index value associated with the PRACH transmission; The terminal determines subsequent ROs of the RO resource based on the first RO; the subsequent ROs satisfy one of the following: The subsequent ROs are M-1 consecutive ROs with the same frequency position as the first RO; The subsequent ROs are the M-1 ROs associated with SSBs sent sequentially according to their SSB index values ​​after the SSB associated with the first RO. The subsequent RO and the first RO belong to the same RO set, wherein the RO set is configured or predefined by the network-side device and includes multiple ROs; The subsequent ROs are M-1 ROs that share the same SSB as the first RO.

2. The PRACH repeat transmission method according to claim 1, characterized in that, The terminal determines the RO resources corresponding to M repeated PRACH transmissions based on the SSB index value and RO index value associated with the PRACH transmission, including: The terminal determines an RO corresponding to the SSB indicated by the PDCCH based on the SSB index value and RO index value associated with the PRACH transmission in the PDCCH; The terminal determines the first RO set containing the RO corresponding to the SSB indicated by the PDCCH based on the RO set configured by the network-side device. The terminal determines M-1 ROs from the first RO set, and uses one RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs as the RO resources corresponding to the M PRACH repeated transmissions.

3. The PRACH repeat transmission method according to claim 1, characterized in that, The terminal performs repeated transmission of the Physical Random Access Channel (PRACH) according to the PDCCH, including: The terminal determines the second RO set from multiple RO sets configured by the network-side device according to the indication of the second bit field; The terminal uses multiple ROs from the second RO set as the RO resources.

4. The PRACH repeat transmission method according to claim 3, characterized in that, The second bit field is the code point in the PRACH mask index information field.

5. The PRACH repeat transmission method according to claim 1, characterized in that, The terminal performs repeated transmission of the Physical Random Access Channel (PRACH) according to the PDCCH, including: The terminal determines the RO resource based on the target parameters; The target parameters include one of the following: The frequency resource location corresponding to the RO resource; The remainder of the RO index value corresponding to the RO resource.

6. The PRACH repeat transmission method according to claim 5, characterized in that, The terminal determines the RO resource based on the target parameters, including one of the following: The terminal determines N ROs with the same frequency resource location based on the frequency resource location corresponding to the RO resource, and uses the N ROs with the same frequency resource location as the RO resource. The terminal determines N RO index values ​​based on the remainder of the RO index values ​​corresponding to the RO resources, and uses the N ROs corresponding to the N RO index values ​​as the RO resources. Where N is a positive integer.

7. A method for repeated PRACH transmission, characterized in that, include: Network-side devices send Physical Downlink Control Channel (PDCCH) to the terminal; The PDCCH includes at least one of the following: First indication information used to instruct the terminal to perform repeated PRACH transmissions; Second indication information used to determine random access transport opportunity (RO) resources; Wherein, the Random Access Transport Opportunity (RO) resource is used for the repeated transmission of PRACH; the first indication information includes at least one of the following: The index value of the PRACH transmission, which is configured as the preamble index value for performing the PRACH retransmission; Uplink UL / Supplemental Uplink SUL Indication Field, the UL / SUL indication field is interpreted by the terminal as indicating the PRACH repeated transmission; One or more code points in the PRACH mask index information field, the code points being used to indicate repeated PRACH transmission; The first bit field is used to indicate the repeated transmission of the PRACH; the second indication information includes at least one of the following: The SSB and RO index values ​​of the synchronization signal block associated with PRACH transmission; The second bit field is used to indicate the RO set corresponding to the RO resource; Target parameters, which are used to indicate parameters for determining the RO resource; The terminal is used to determine the RO resources corresponding to M repeated PRACH transmissions based on the SSB index value and RO index value associated with the PRACH transmission, where M is a positive integer greater than 1 and M is configured by the network-side device. Specifically, the terminal is used to determine the first RO in the RO resource based on the SSB index value and RO index value associated with the PRACH transmission; The terminal determines the subsequent ROs of the RO resource based on the first RO; The subsequent RO satisfies one of the following: The subsequent ROs are M-1 consecutive ROs with the same frequency position as the first RO; The subsequent ROs are the M-1 ROs associated with SSBs sent sequentially according to their SSB index values ​​after the SSB associated with the first RO. The subsequent RO and the first RO belong to the same RO set, wherein the RO set is configured or predefined by the network-side device and includes multiple ROs; The subsequent ROs are M-1 ROs that share the same SSB as the first RO.

8. The PRACH repeat transmission method according to claim 7, characterized in that, The method further includes: Send at least one RO set information to the terminal, the RO set information being used to indicate the RO set in which the terminal can use RO resources for PRACH retransmission.

9. The PRACH repeat transmission method according to claim 7, characterized in that, The second bit field is the code point in the PRACH mask index information field.

10. The PRACH repetitive transmission method according to claim 7, characterized in that, The target parameter includes one of the following: The frequency resource location corresponding to the RO resource; The remainder of the RO index value corresponding to the RO resource.

11. A PRACH repeat transmission device, characterized in that, include: The first receiving unit is used to receive the Physical Downlink Control Channel (PDCCH). The first processing unit is used to perform repeated transmission of the Physical Random Access Channel (PRACH) according to the PDCCH. The PDCCH includes at least one of the following: First indication information used to instruct the terminal to perform repeated PRACH transmissions; Second indication information used to determine random access transport opportunity (RO) resources; Wherein, the Random Access Transport Opportunity (RO) resource is used for the repeated transmission of PRACH; the first indication information includes at least one of the following: The index value of the PRACH transmission, which is configured as the preamble index value for performing the PRACH retransmission; Uplink UL / Supplemental Uplink SUL Indication Field, the UL / SUL indication field is interpreted by the terminal as indicating the PRACH repeated transmission; One or more code points in the PRACH mask index information field, the one or more code points being used to indicate the repeated transmission of the PRACH; The first bit field is used to indicate the repeated transmission of the PRACH; the second indication information includes at least one of the following: The SSB and RO index values ​​of the synchronization signal block associated with PRACH transmission; The second bit field is used to indicate the RO set corresponding to the RO resource; Target parameters, which are used to indicate parameters for determining the RO resource; the step of performing repeated transmission of the Physical Random Access Channel (PRACH) according to the PDCCH includes: Based on the SSB index value and RO index value associated with the PRACH transmission, the RO resources corresponding to M repeated PRACH transmissions are determined, where M is a positive integer greater than 1, and M is configured by the network-side device; the determination of the RO resources corresponding to M repeated PRACH transmissions based on the SSB index value and RO index value associated with the PRACH transmission includes: The first RO in the RO resource is determined based on the SSB index value and RO index value associated with the PRACH transmission; Based on the first RO, determine the subsequent ROs of the RO resource; the subsequent ROs satisfy one of the following: The subsequent ROs are M-1 consecutive ROs with the same frequency position as the first RO; The subsequent ROs are the M-1 ROs associated with SSBs sent sequentially according to their SSB index values ​​after the SSB associated with the first RO. The subsequent RO and the first RO belong to the same RO set, wherein the RO set may be configured or predefined by the network-side device and includes multiple ROs; The subsequent ROs are M-1 ROs that share the same SSB as the first RO.

12. The PRACH repeat transmission device according to claim 11, characterized in that, The step of determining the RO resource corresponding to M repeated PRACH transmissions based on the SSB index value and RO index value associated with the PRACH transmission includes: Based on the SSB index value and RO index value associated with the PRACH transmission, determine an RO corresponding to the SSB indicated by the PDCCH; Based on the RO set configured by the network-side device, determine the first RO set where the RO corresponding to the SSB indicated by the PDCCH is located; M-1 ROs are determined from the first RO set, and one RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs are used as the RO resources corresponding to the M PRACH repeated transmissions.

13. The PRACH repeat transmission device according to claim 11, characterized in that, The step of performing repeated transmission of the Physical Random Access Channel (PRACH) based on the PDCCH includes: Based on the indication of the second bit field, a second RO set is determined from multiple RO sets configured on the network-side device; Multiple ROs in the second RO set are used as the RO resources.

14. The PRACH repeat transmission device according to claim 13, characterized in that, The second bit field is the code point in the PRACH mask index information field.

15. The PRACH repeat transmission apparatus according to claim 11, characterized in that, The step of performing repeated transmission of the Physical Random Access Channel (PRACH) based on the PDCCH includes: The RO resources are determined based on the target parameters indicated by the PDCCH; The target parameters include one of the following: The frequency resource location corresponding to the RO resource; The remainder of the RO index value corresponding to the RO resource.

16. The PRACH repeat transmission apparatus according to claim 15, characterized in that, The determination of the RO resource based on the target parameters indicated by the PDCCH includes one of the following: Based on the frequency resource location corresponding to the RO resource, determine N ROs with the same frequency resource location, and use the N ROs with the same frequency resource location as the RO resources for repeated PRACH transmission; Based on the remainder of the RO index value corresponding to the RO resource, determine N RO index values, and use the N RO corresponding to the N RO index values ​​as the RO resources for repeated PRACH transmission; Where N is a positive integer.

17. A PRACH repeating transmission device, characterized in that, include: The first transmitting unit is used to transmit the Physical Downlink Control Channel (PDCCH) to the terminal; The PDCCH includes at least one of the following: First indication information used to instruct the terminal to perform repeated PRACH transmissions; Second indication information used to determine random access transport opportunity (RO) resources; Wherein, the Random Access Transport Opportunity (RO) resource is used for the repeated transmission of PRACH; the first indication information includes at least one of the following: The index value of the PRACH transmission, which is configured as the preamble index value for performing the PRACH retransmission; Uplink UL / Supplemental Uplink SUL Indication Field, the UL / SUL indication field is interpreted by the terminal as indicating the PRACH repeated transmission; One or more code points in the PRACH mask index information field, the code points being used to indicate repeated PRACH transmission; The first bit field is used to indicate the repeated transmission of the PRACH; the second indication information includes at least one of the following: The SSB and RO index values ​​of the synchronization signal block associated with PRACH transmission; The second bit field is used to indicate the RO set corresponding to the RO resource; Target parameters, which are used to indicate parameters for determining the RO resource; The terminal is used to determine the RO resources corresponding to M repeated PRACH transmissions based on the SSB index value and RO index value associated with the PRACH transmission, where M is a positive integer greater than 1 and M is configured by the network-side device. Specifically, the terminal is used to determine the first RO in the RO resource based on the SSB index value and RO index value associated with the PRACH transmission; The terminal determines the subsequent ROs of the RO resource based on the first RO; The subsequent RO satisfies one of the following: The subsequent ROs are M-1 consecutive ROs with the same frequency position as the first RO; The subsequent ROs are the M-1 ROs associated with SSBs sent sequentially according to their SSB index values ​​after the SSB associated with the first RO. The subsequent RO and the first RO belong to the same RO set, wherein the RO set is configured or predefined by the network-side device and includes multiple ROs; The subsequent ROs are M-1 ROs that share the same SSB as the first RO.

18. The PRACH repeat transmission apparatus according to claim 17, characterized in that, Also includes: The second sending unit is used to send at least one RO set information to the terminal, the RO set information being used to indicate the RO set in which the terminal can use RO resources for PRACH retransmission.

19. A terminal, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the PRACH repeat transfer method as described in any one of claims 1 to 6.

20. A network-side device, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the PRACH repeat transfer method as described in any one of claims 7 to 10.

21. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the PRACH repeat transmission method as described in any one of claims 1 to 10.

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