WO2023083227A1 - Method for repeated transmission of prach, and terminal and network-side device - Google Patents

Abstract

The present application belongs to the technical field of communications. Disclosed are a method for the repeated transmission of a physical random-access channel (PRACH), and a terminal and a network-side device. The method for the repeated transmission of the PRACH in the embodiments of the present application comprises: a terminal receiving a physical downlink control channel (PDCCH); and the terminal performing repeated transmission of a PRACH according to the PDCCH, wherein the PDCCH comprises at least one of the following: first instruction information, which is used for instructing the terminal to perform the repeated transmission of the PRACH; and second indication information, which is used for determining a random-access channel transmission occasion (RO) resource, the RO resource being used for the repeated transmission of the PRACH.

Description

PRACH repeated transmission method, terminal and network side equipment

Cross References to Related Applications

This application claims the priority of the Chinese patent application with the application number 202111322649.1 filed on November 09, 2021, and the title of the invention is "PRACH repeated transmission method, terminal and network side equipment", which is fully incorporated by reference into this application.

technical field

The present application belongs to the technical field of communication, and in particular relates to a PRACH repeated transmission method, terminal and network side equipment.

Background technique

In the physical random access channel (Physical random-access channel, PRACH) transmission method, PRACH repeated transmission is a method of improving PRACH coverage. In the case of supporting PRACH repeated transmission, how to realize PRACH repeated transmission needs to be solved.

Contents of the invention

Embodiments of the present application provide a PRACH retransmission method, terminal and network side equipment, which can solve the problem of how to implement PRACH retransmission.

In the first aspect, a PRACH repeated transmission method is provided, which is applied to a terminal, and the method includes:

The terminal receives the physical downlink control channel PDCCH;

The terminal performs repeated transmission 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 PRACH retransmission;

The second indication information used to determine the RO resource of the random access transmission opportunity;

Wherein, the random access transmission opportunity (RO) resource is used for the repeated transmission of the PRACH.

In a second aspect, a PRACH repeated transmission method is provided, which is applied to a network side device, and the method includes:

The network side device sends the physical downlink control channel PDCCH to the terminal;

Wherein, the PDCCH includes at least one of the following:

First indication information for instructing the terminal to perform PRACH retransmission;

The second indication information used to determine the RO resource of the random access transmission opportunity;

Wherein, the random access transmission opportunity (RO) resource is used for the repeated transmission of the PRACH.

In a third aspect, a PRACH retransmission device is provided, which includes:

A first receiving unit, configured to receive a physical downlink control channel PDCCH;

The first processing unit is configured to perform repeated transmission 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 PRACH retransmission;

The second indication information used to determine the RO resource of the random access transmission opportunity;

Wherein, the random access transmission opportunity (RO) resource is used for the repeated transmission of the PRACH.

In a fourth aspect, a PRACH retransmission device is provided, the device comprising:

The first sending unit is configured to send a physical downlink control channel PDCCH to the terminal;

Wherein, the PDCCH includes at least one of the following:

First indication information for instructing the terminal to perform PRACH retransmission;

The second indication information used to determine the RO resource of the random access transmission opportunity;

Wherein, the random access transmission opportunity (RO) resource is used for the repeated transmission of the PRACH.

According to a fifth aspect, a terminal is provided. The terminal includes a processor, a memory, and a program or instruction stored in the memory and operable on the processor. When the program or instruction is executed by the processor The steps of implementing the PRACH repeated transmission method described in the first aspect.

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 physical random access channel PRACH repetition according to the PDCCH transmission; wherein the PDCCH includes at least one of the following: first indication information used to instruct the terminal to perform PRACH repeated transmission; second indication information used to determine random access transmission opportunity RO resources; wherein the random The access transmission opportunity RO resource is used for the repeated transmission of the PRACH.

According to the seventh aspect, a network-side device is provided, the network-side device includes a processor, a memory, and a program or instruction stored in the memory and operable on the processor, and the program or instruction is executed by the The processor implements the steps of implementing the PRACH repeated transmission method as described in the second aspect.

In an eighth aspect, 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: used to indicate First indication information for the terminal to perform repeated PRACH transmission; second indication information for determining random access transmission opportunity RO resources; wherein, the random access transmission opportunity RO resource is used for the PRACH repeated transmission.

A ninth aspect provides a readable storage medium, on which a program or an instruction is stored, and when the program or instruction is executed by a processor, the steps of the PRACH repeated transmission method as described in the first aspect are implemented, Or realize the steps of the PRACH repeated transmission method as described in the second aspect.

In a tenth aspect, a chip is provided, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the PRACH as described in the first aspect A repeated transmission method, or implement the PRACH repeated transmission method as described in the second aspect.

In an eleventh aspect, a computer program/program product is provided, the computer program/program product is stored in a non-transitory storage medium, and the program/program product is executed by at least one processor to implement the first The steps of the PRACH repeated transmission method described in the aspect, or the implementation of the PRACH repeated transmission method described in the second aspect.

In the embodiment of the present application, according to the received PDCCH, the PRACH retransmission information is determined, and the PRACH retransmission is performed, so that the PRACH retransmission can be triggered through the PDCCH, thereby optimizing the random access procedure.

Description of drawings

FIG. 1 is a structural diagram of a wireless communication system applicable to an embodiment of the present application;

Figure 2 is one of the schematic diagrams of the relationship between RO and SSB;

Figure 3 is the second schematic diagram of the relationship between RO and SSB;

FIG. 4 is one of the schematic flow diagrams of the PRACH repeated transmission method provided by the embodiment of the present application;

FIG. 5 is the second schematic flow diagram of the PRACH repeated transmission method provided by the embodiment of the present application;

FIG. 6 is one of the structural schematic diagrams of the PRACH repeated transmission device provided by the embodiment of the present application;

FIG. 7 is the second structural schematic diagram of the PRACH retransmission device provided by the embodiment of the present application;

FIG. 8 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

FIG. 9 is a schematic diagram of a hardware structure of a terminal implementing an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a network side device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in this application belong to the protection scope of this application.

The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein and that "first" and "second" distinguish objects. It is usually one category, and the number of objects is not limited. For example, there may be one or more first objects. In addition, "and/or" in the description and claims means at least one of the connected objects, and the character "/" generally means that the related objects are an "or" relationship.

It is worth pointing out that the technology described in the embodiment of this application is not limited to the Long Term Evolution (Long Term Evolution, LTE)/LTE-Advanced (LTE-Advanced, LTE-A) system, and can also be used in other wireless communication systems, such as code 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 (Single-carrier Frequency-Division Multiple Access, SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technologies can be used for the above-mentioned systems and radio technologies as well as other systems and radio technologies. The following description describes the New Radio (NR) system for illustrative purposes, and uses NR terminology in most of the following descriptions, but these techniques can also be applied to applications other than NR system applications, such as the 6th generation (6 ^th Generation, 6G) communication system.

FIG. 1 shows a structural diagram of a wireless communication system to which this embodiment of the present application is applicable. The wireless communication system includes a terminal 11 and a network side device 12 . Wherein, the terminal 11 can also be called a terminal device or a user terminal (User Equipment, UE), and the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital Assistant (Personal Digital Assistant, PDA), handheld computer, netbook, ultra-mobile personal computer (ultra-mobile personal computer, UMPC), mobile internet device (Mobile Internet Device, MID), augmented reality (augmented reality, AR)/virtual reality (virtual reality, VR) equipment, robots, wearable devices (Wearable Device), vehicle-mounted equipment (VUE), pedestrian terminal (PUE), smart home (home equipment with wireless communication functions, such as refrigerators, TVs, washing machines or furniture etc.) and other terminal-side devices, wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.) , smart wristbands, smart clothing, game consoles, etc. It should be noted that, the embodiment of the present application does not limit the specific type of the terminal 11 . The network side device 12 may be a base station or a core network, where a base station may be called a node B, an evolved node B, an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service Basic Service Set (BSS), Extended Service Set (ESS), Node B, Evolved Node B (eNB), Home Node B, Home Evolved Node B, WLAN access point, WiFi node, transmission Receiving point (Transmitting Receiving Point, TRP) or some 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 the embodiment of this application, only The base station in the NR system is taken as an example, but the specific type of the base station is not limited.

The PRACH retransmission method provided by the embodiment of the present application will be described in detail below through some embodiments and application scenarios with reference to the accompanying drawings.

In the prior art, a contention random access procedure and a non-contention random access procedure are included.

In the random access process of competition, also known as 4-step RACH, the UE first sends msg1 to the network side device, including the preamble; after the network detects the preamble, it will send msg2, including the random access response (Random Access Response) corresponding to the preamble , RAR) message; after receiving msg2, UE sends msg3 according to the instruction of RAR; after receiving msg3, the network will send msg4, including the contention resolution ID; UE receives msg4, and completes 4-step random access.

The network includes uplink (Uplink, UL) grant information in RAR to indicate MSG3 physical uplink shared channel (Physical Uplink Shared Channel, PUSCH) scheduling information, and includes random access preamble ID (RACH preamble ID, RAPID), Temporary Cell Radio Network Temporary Identifier (Temporary Cell Radio Network Temporary Identifier, TC-RNTI), Timing Advance (Timing Advance, TA) and other information. If the network does not receive the MSG3 PUSCH, it can schedule the retransmission of the MSG3 PUSCH in the physical downlink control channel (Physical Downlink Control Channel, PDCCH) scrambled by the TC-RNTI.

For the contention random access process, different UEs randomly select a preamble for transmission, so that different UEs may select the same preamble to send on the same resource, triggering the contention random access process. This situation can be understood as a preamble conflict of the UE. In this case, different UEs will receive the same RAR, and at this time different UEs will transmit MSG3 PUSCH according to the scheduling information in the RAR UL grant. The network will include the contention resolution ID in the MSG4 Physical Downlink Shared Channel (PDSCH) to match the Common Control Channel (CCCH) service data unit (Service Data Unit, SDU) sent by the UE in the MSG3 PUSCH , the UE considers that the contention is resolved successfully, and uses the TC-RNTI as the UE's Cell Radio Network Temporary Identity (C-RNTI). If there is no match, the contention resolution is considered unsuccessful.

If the contention resolution is unsuccessful, the RACH transmission resource is reselected, the PRACH transmission is performed, and the next random access attempt is performed.

In NR, the base station can configure multiple Frequency Division Multiplexing (FDM) PRACH transmission occasions (Physical Random Access Channel transmission opportunities, or PRACH occasions) at a time domain position where PRACH is transmitted. In this application, for simplicity, it is referred to as RO for short. The number of ROs that can perform FDM on a time instance (time instance) can be: {1,2,4,8}.

The random access preamble (RACH preamble) can only be transmitted on the time domain resource configured by the parameter PRACHConfigurationIndex, and the random access preamble can only be transmitted on the frequency domain resource configured by the parameter prach-FDM, and the PRACH frequency domain resource n _RA ∈{0, 1,...,M−1}, where M is equal to the higher layer parameter prach-FDM. At the time of initial access, the PRACH frequency domain resource n _RA is numbered in ascending order from the RO resource with the lowest frequency in the initial active uplink bandwidth part (initially activated uplink bandwidth part), otherwise, the PRACH frequency domain resource n _RA starts from the active uplink bandwidth part (activated The RO resources with the lowest frequency in the uplink bandwidth part) are numbered in ascending order.

In NR, there is a relationship between RO and the actually sent SSB (SS/PBCH block, synchronization signal/physical broadcast channel block, sometimes referred to as SS block, synchronization signal block). One RO may be associated with multiple SSBs, or multiple SSBs may be associated with one RO. Generally, different SSBs can use different beams for transmission, and the terminal can also use a beam that matches the SSB on the RO of the associated SSB to perform repeated transmission of the PRACH.

FIG. 2 is one of the schematic diagrams of the relationship between RO and SSB. As shown in Figure 2, the number of FDM ROs 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. Each SSB is associated with 2 ROs. If the UE sends PRACH on the RO corresponding to SSB0, then the UE selects one RO from RO#0 and RO#1 to send the PRACH.

FIG. 3 is the second schematic diagram of the relationship between RO and SSB. As shown in Figure 3, the number of FDM ROs on a time instance is 2, and the number of SSBs actually transmitted is 8. For example, the corresponding SSBs are SSB#0, SSB#1, ..., SSB#7, every 2 Each SSB is associated with one RO. When multiple SSBs share one RO, the preamble sets associated with the multiple SSBs are different.

Note that the boxes shown in Figure 2 and Figure 3 are all ROs, and the SSB marked in the boxes refers to the SSB associated with the RO.

Before sending PRACH, the UE first performs resource selection, and first selects the RO corresponding to the SSB whose RSRP is higher than the threshold. If there are multiple SSBs higher than the threshold, the terminal can select any SSB. After determining the SSB, if the SSB is associated with multiple ROs, the terminal may select one of the ROs for PRACH transmission. A preamble is randomly selected from the preamble set associated with the SSB in the RO to send the PRACH.

Table 1 shows the format of the PDCCH instructing the network to transmit the PRACH.

Table 1 indicates the format of the PDCCH for PRACH transmission

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

Table 2 Definition of PRACH mask index

When the network triggers the PRACH transmission through the PDCCH, it will also indicate the index value of the RO transmitted by the PRACH and the index value of the SSB associated with the PRACH. Since an SSB is associated with up to 8 ROs, a mask can be used to indicate on which RO to perform PRACH transmission, or to indicate that in a limited RO set, for example, an RO is selected from odd-numbered ROs or even-numbered ROs for PRACH transmission.

The PRACH transmission method triggered by the network through the PDCCH order is applicable to the scenario where the downlink data arrives but the uplink is out of sync. In the case of supporting PRACH repetition, it is also necessary to further support PDCCH ordered PRACH repeated transmission. Then, how to determine the resources for the repeated transmission of the PRACH and the index of the SSB associated with each repeated transmission needs to be further clarified.

Figure 4 is one of the schematic flow charts of the PRACH repeated transmission method provided by the embodiment of the present application. As shown in Figure 4, the method includes the following steps:

Step 400, the terminal receives the physical downlink control channel PDCCH;

Wherein, the PDCCH includes at least one of the following:

First indication information for instructing the terminal to perform PRACH retransmission;

The second indication information used to determine the RO resource of the random access transmission opportunity;

Wherein, the random access transmission opportunity (RO) resource is used for the repeated transmission of the PRACH.

Step 401, the terminal performs repeated transmission of a Physical Random Access Channel (PRACH) according to the PDCCH.

In the embodiment of the present application, the repeated transmission of PRACH can also be understood as performing multiple PRACH transmissions on multiple RO resources, and the PRACH preamble used for multiple transmissions can be the same or different.

The repeated transmission of the physical random access channel PRACH by the terminal according to the PDCCH includes:

The terminal determines, according to the first indication information in the PDCCH, that the network side device instructs repeated transmission of the PRACH.

In other words, if the PDCCH detected by the terminal includes the first indication information, the terminal determines that the network side device instructs the terminal to perform repeated PRACH transmission. If the PDCCH detected by the terminal does not include the first indication information, the terminal determines that the network side device does not instruct the terminal to perform repeated PRACH transmission.

Optionally, the terminal performing the repeated transmission of the physical random access channel PRACH according to the PDCCH may further include: the terminal determining the random access transmission opportunity RO resource for the PRACH repetition according to the second indication information in the PDCCH.

After determining the resource for PRACH retransmission, the terminal can perform PRACH retransmission on the resource.

In the embodiment of this application, according to the received PDCCH, it is determined that the network side device indicates PRACH retransmission and the RO resources used for PRACH retransmission, and performs PRACH retransmission, which can trigger PRACH retransmission through PDCCH, thereby optimizing random access process.

In some embodiments, the step 401, the terminal performs repeated transmission of the physical random access channel PRACH according to the PDCCH, including at least one of the following:

The terminal determines, according to the first indication information in the PDCCH, that the network side equipment instructs the PRACH to retransmit;

In a case where it is determined that the network side device instructs the repeated transmission of the PRACH, the terminal determines, according to the second indication information in the PDCCH, the random access transmission opportunity (RO) resource used for the repeated transmission of the PRACH.

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

An index value for PRACH transmission, where the index value for PRACH transmission is configured as a preamble index value for performing repeated PRACH transmission;

An uplink (Uplink, UL)/supplementary uplink (Supplementary Uplink, SUL) indication field, the UL/SUL indication field is interpreted by the terminal as being used to indicate the repeated transmission of the PRACH;

One or more code points in the PRACH mask index information domain, where the one or more code points are used to indicate the repeated transmission of the PRACH;

A first bit field, where the first bit field is used to indicate the repeated transmission of the PRACH.

In one embodiment, the terminal determines whether the network side device indicates repeated transmission of the PRACH according to the index value of the PRACH transmission.

In the case that the index value of PRACH transmission is configured as the preamble index value used for PRACH repeated transmission, the terminal can determine that the PDCCH carries a PRACH repeated transmission indication, and then the terminal will perform PRACH repeated transmission.

The Random Access Preamble index in Table 1 is the index value of the PRACH transmission here.

Optionally, the preamble index value used for the repeated transmission of the PRACH is configured by the network side device.

Optionally, the network side device configures an index value in the first preset range as a preamble index value used for repeated transmission of the PRACH.

Then, 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 a preamble index value for PRACH repeated transmission, in other words, it means that the network side device indicates PRACH repeated transmission.

In one embodiment, the terminal determines whether the network side device indicates repeated transmission of the PRACH according to the UL/SUL indication field.

In the case that the UL/SUL indication field is interpreted by the terminal as indicating the repeated transmission of the PRACH, the terminal determines that the network side device indicates the repeated transmission of the PRACH.

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

For example, in the case of frequency range 2 (Frequency Range 2, FR2), SUL will not be deployed, then this field can be reinterpreted as indicating repeated transmission of PRACH.

In one embodiment, the terminal determines whether the network-side device indicates repeated PRACH transmission according to values of one or more codepoints in the PRACH mask index information field.

For example, code points with mask index values 11-15 in Table 2 may be used to indicate repeated transmission of the PRACH.

In an implementation manner, the first bit field indicates repeated transmission of the PRACH.

Among them, the first bit field is a new bit field.

For example, use the bit field after the PRACH MASK index in Table 1 to indicate the repeated transmission of the PRACH. These bits are currently reserved and can be reused.

The embodiment of the present application provides a design scheme of the PDCCH indicating the DCI of the repeated transmission of the PRACH, which realizes the triggering of the repeated transmission of the PRACH through the PDCCH, thereby optimizing the random access procedure.

Further, after determining that the network-side device indicates PRACH repeated transmission, the terminal may determine the RO resource for PRACH repeated transmission according to the PRACH repeated transmission resource indication in the PDCCH and in combination with RO-related configuration information provided by the network-side device.

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

PRACH transmission associated synchronization signal block SSB index value and RO index value;

A second bit field, where the second bit field is used to indicate the RO set corresponding to the RO resource;

A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource.

The embodiment of the present application provides a design scheme for the PDCCH to indicate the DCI of the PRACH retransmission resource, and implements the triggering of the PRACH retransmission through the PDCCH, thereby optimizing the random access procedure.

In some embodiments, the terminal performs repeated transmission of a physical random access channel PRACH according to the PDCCH, including:

According to the synchronization signal block SSB index value and RO index value associated with the PRACH transmission in the PDCCH, the terminal determines the RO resource corresponding to M times of PRACH repeated transmission, where M is a positive integer greater than 1, and M is determined by the network side Device Configuration.

Further, according to the synchronization signal block SSB index value and RO index value associated with the PRACH transmission in the PDCCH, determining the RO resource corresponding to the M times of PRACH repeated transmission includes the following methods:

method one:

According to the SSB index value and RO index value associated with the PRACH transmission, the terminal determines the RO resource corresponding to M times of PRACH repeated transmission, including:

The terminal determines the first RO in the RO resource according to the SSB index value and the RO index value associated with the PRACH transmission;

The terminal determines a subsequent RO of the RO resource according to the first RO.

Wherein, 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.

According to the SSB index value and the RO index value associated with the PRACH transmission, the terminal can determine an RO, and use the RO as the first RO in the RO resource corresponding to the M times of PRACH repeated transmission.

Then, according to the first RO, a subsequent RO in the RO resources corresponding to the M times of repeated PRACH transmission is determined.

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

(1) The subsequent ROs are M-1 consecutive ROs having the same frequency position as the first RO;

In other words, the RO resource for the terminal to perform M times of repeated PRACH transmissions is a plurality of consecutive ROs with the same frequency position.

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

Optionally, the index values of the ROs associated with the M SSBs are also the same.

For example, the network indicates RO#0 of SSB#2, and M=4 repeated transmissions are performed, and the index values of the actually sent SSBs are SSB#0, 2, 4, 5, 7, then the RO resource for PRACH repeated transmission is ({SSB#0, RO#0}, {SSB#2, RO#0}, {SSB#4, RO#0}, {{SSB#5, RO#0}}).

(3) The subsequent RO and the first RO belong to the same RO set, wherein the RO set is either configured or predefined by the network side device and includes multiple ROs;

It should be noted that the RO set can also be described as other RO resource units, for example, RO group. An RO resource unit contains multiple ROs.

The RO set/group configured on the network side device includes multiple ROs, and the multiple ROs may be associated with the same or different SSBs.

For example, the network is configured with Group X=({SSB#a, RO#b}, {SSB#c, RO#d}, {SSB#e, RO#f}, {{SSB#g, RO#h}} ) belong to the same RO set/group, if the PDCCH indicates {SSB#a, RO#b}, then use group X=({SSB#a, RO#b}, {SSB#c, RO#d}, {SSB#e, RO#f}, {{SSB#g, RO#h}}) This group of ROs performs repeated PRACH transmission.

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

(4) The subsequent ROs are M-1 ROs associated with the same SSB as the first RO.

Optionally, the index values of these ROs are all the same.

In this solution, the same SSB is associated with the repeated transmission of the PRACH, which can be understood as using the same beam for repeated transmission of the PRACH.

Method 2:

According to the SSB index value and RO index value associated with the PRACH transmission, the terminal determines the RO resource corresponding to M times of PRACH repeated transmission, including:

The terminal determines an RO corresponding to the SSB indicated by the PDCCH according to the SSB index value and the RO index value associated with the PRACH transmission;

The terminal determines the first RO set in which an RO corresponding to the SSB indicated by the PDCCH is located according to 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 times of PRACH repeated transmission .

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

If the RO determined according to the PDCCH indication belongs to a certain RO set/group, the terminal performs repeated PRACH transmission in multiple ROs included in the RO set/group.

At this time, the terminal is not limited to using the RO indicated by the PDCCH as the first RO for repeated transmission of the PRACH.

For example, the network indicates RO#2 associated with SSB#2, and in the RO set/group configured by the network {(SSB#0, RO#2), {SSB#2, RO#2}, {SSB#4, RO #4}, {SSB#6, RO#4}} is a group of RO, {SSB#2, RO#2} belongs to the RO set/group, then the terminal uses multiple RO resources in the group for PRACH repetition transmission.

In the embodiment of the present application, according to the received PRACH repeated transmission indication in the PDCCH, it is determined that the network side device indicates the PRACH repeated transmission, and the PRACH repeated transmission can be determined according to the SSB index value and the RO index value associated with the PRACH transmission in the PDCCH The RO resources can be used to trigger PRACH retransmission through the PDCCH, thereby optimizing the random access process.

In addition, the terminal can also determine the RO resources used for the repeated transmission of the PRACH according to the indication of the second bit field in the PDCCH.

Method 3:

In some embodiments, the terminal performs repeated transmission of a physical random access channel PRACH according to the PDCCH, including:

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;

The terminal uses multiple ROs in the second RO set as the RO resources.

It can be understood that the network can configure a combination of multiple RO set/groups, each RO set/group includes multiple ROs, and the second bit field in the PDCCH indicates one of the multiple RO set/groups, and the terminal based on the The indication of the second bit field determines a RO set/group for repeated PRACH transmission.

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

One possible solution is that the PRACH Mask Index field can be reused at this time to indicate the RO combination for PRACH repeated transmission. In other words, one RO set/group in up to 16 RO set/groups can be indicated through the PRACH MASK Index field Perform PRACH retransmission.

The embodiment of the present application provides a DCI design scheme for indicating PRACH retransmission resources, which can trigger PRACH retransmission through the PDCCH, thereby optimizing the random access procedure.

Method 4:

The terminal can also implicitly determine RO resources for repeated transmission of the PRACH according to the target parameters indicated by the PDCCH.

That is, the terminal performs repeated transmission of the physical random access channel PRACH according to the PDCCH, including:

The terminal determines the RO resource according to the target parameter;

Wherein, the target parameters include one of the following:

A frequency resource location corresponding to the RO resource;

The remainder of the RO index value corresponding to the RO resource.

The terminal determines the RO resource according to the target parameter, including one of the following:

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

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

Wherein, N is a positive integer.

The embodiment of the present application provides another DCI design scheme for indicating PRACH retransmission resources, which can trigger PRACH retransmission through the PDCCH, thereby optimizing the random access procedure.

The PRACH retransmission method provided by the embodiment of the present application further designs DCI, and introduces a new mechanism for determining PRACH retransmission resources, supports the mechanism of PDCCH triggering PRACH retransmission, and can optimize the random access process.

FIG. 5 is the second schematic flow diagram of the PRACH retransmission method provided by the embodiment of the present application. As shown in Figure 5, the method includes the following steps:

Step 500, the network side device sends the physical downlink control channel PDCCH to the terminal;

Wherein, the PDCCH includes at least one of the following:

First indication information for instructing the terminal to perform PRACH retransmission;

The second indication information used to determine the RO resource of the random access transmission opportunity;

Wherein, the random access transmission opportunity (RO) resource is used for the repeated transmission of the PRACH.

It can be understood that the network side device may send the PDCCH including at least one of the PRACH retransmission indication and the PRACH retransmission resource indication to the terminal, so as to support the PDCCH triggering the PRACH retransmission.

The first indication information is used to instruct the terminal to perform repeated transmission of the PRACH.

The second indication information is used to determine the RO resource of the random access transmission opportunity, that is, the second indication information is used to instruct the terminal to perform the RO resource for repeated PRACH transmission.

In the embodiment of the present application, the PDCCH is sent to the terminal, and the PDCCH includes at least one of the PRACH repeated transmission indication and the PRACH repeated transmission resource indication, so that the terminal can determine the information of the PRACH repeated transmission, thereby realizing triggering the PRACH repeated transmission through the PDCCH , which can optimize the random access process.

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

An index value for PRACH transmission, where the index value for PRACH transmission is configured as a preamble index value for performing repeated PRACH transmission;

an uplink UL/supplementary uplink SUL indication field, the UL/SUL indication field is interpreted by the terminal as indicating the repeated transmission of the PRACH;

One or more code points in the PRACH mask index information domain, where the one or more code points are used to indicate the repeated transmission of the PRACH;

A first bit field, where the first bit field is used to indicate the repeated transmission of the PRACH.

In an implementation manner, the network side device uses the index value of the PRACH transmission to indicate the repeated transmission of the PRACH.

In the case that the index value of PRACH transmission is configured as the preamble index value used for PRACH repeated transmission, the terminal can determine that the PDCCH carries a PRACH repeated transmission indication, and then the terminal will perform PRACH repeated transmission.

The Random Access Preamble index in Table 1 is the index value of the PRACH transmission here.

Optionally, the preamble index value used for the repeated transmission of the PRACH is configured by the network side device.

Optionally, the network side device configures an index value in the first preset range as a preamble index value used for repeated transmission of the PRACH.

Then, 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 a preamble index value for PRACH repeated transmission, in other words, it means that the network side device indicates PRACH repeated transmission.

In one implementation manner, the network side device uses the UL/SUL indication field to indicate the repeated transmission of the PRACH.

In the case that the UL/SUL indication field is interpreted by the terminal as indicating the repeated transmission of the PRACH, the terminal determines that the network side device indicates the repeated transmission of the PRACH.

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

For example, in the case of frequency range 2 (Frequency Range 2, FR2), SUL will not be deployed, then this field can be reinterpreted as indicating repeated transmission of PRACH.

In an implementation manner, one or more codepoints in the PRACH mask index information field of the network side device indicate PRACH repeated transmission.

For example, code points with mask index values 11-15 in Table 2 may be used to indicate repeated transmission of the PRACH.

In an implementation manner, the network side device uses the first bit field to indicate repeated transmission of the PRACH.

Among them, the first bit field is a new bit field.

For example, use the bit field after the PRACH MASK index in Table 1 to indicate the repeated transmission of the PRACH. These bits are currently reserved and can be reused.

The embodiment of the present application provides a design scheme of the PDCCH indicating the DCI of the repeated transmission of the PRACH, which realizes the triggering of the repeated transmission of the PRACH through the PDCCH, thereby optimizing the random access procedure.

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

PRACH transmission associated synchronization signal block SSB index value and RO index value;

A second bit field, where the second bit field is used to indicate the RO set corresponding to the RO resource;

A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource.

The embodiment of the present application provides a design scheme for the PDCCH to indicate the DCI of the PRACH retransmission resource, and implements the triggering of the PRACH retransmission through the PDCCH, thereby optimizing the random access procedure.

Optionally, the terminal determines, according to the SSB index value and the RO index value associated with the PRACH transmission in the PDCCH, the RO resource corresponding to the M times of PRACH repeated transmission.

In one embodiment, the terminal determines the first RO in the RO resource according to the SSB index value and the RO index value associated with the PRACH transmission in the PDCCH; the terminal determines the RO according to the first RO Subsequent RO for the resource.

In another embodiment, the terminal determines an RO corresponding to the SSB indicated by the PDCCH according to the SSB index value and the RO index value associated with the PRACH transmission in the PDCCH; and then according to the RO set configured by the network side device, Determine the first RO set in which an RO corresponding to the SSB indicated by the PDCCH is located, determine M-1 ROs from the first RO set, and combine the RO corresponding to the SSB indicated by the PDCCH with the M-1 ROs are used as RO resources corresponding to the M times of repeated PRACH transmission.

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 the ROs for the repeated transmission of the PRACH resource.

Optionally, the terminal implicitly determines RO resources for repeated transmission of the PRACH according to the target parameter indicated by the PDCCH.

The embodiment of the present application provides a DCI design scheme for indicating PRACH retransmission resources, which can trigger PRACH retransmission through the PDCCH, thereby optimizing the random access procedure.

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

Therefore, in some embodiments, the method also includes:

Sending at least one piece of RO set information to the terminal, where the RO set information is used to indicate the RO set where the RO resources that the terminal can use for PRACH repeated transmission are located.

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

At this time, the network side device can reuse the PRACH Mask Index field to indicate the RO combination for PRACH repeated transmission. PRACH repeated transmission.

In some embodiments, the target parameters include one of the following:

A frequency resource location corresponding to the RO resource;

The remainder of the RO index value corresponding to the RO resource.

The PRACH retransmission method provided by the embodiment of the present application further designs DCI, and introduces a new mechanism for determining PRACH retransmission resources, supports the mechanism of PDCCH triggering PRACH retransmission, and can optimize the random access process.

It should be noted that, the PRACH retransmission method provided in the embodiment of the present application may be executed by a PRACH retransmission device, or a control module in the PRACH retransmission device for executing the PRACH retransmission method. In the embodiment of the present application, the PRACH repeated transmission method performed by the PRACH repeated transmission device is taken as an example to describe the PRACH repeated transmission device provided in the embodiment of the present application.

FIG. 6 is one of the structural schematic diagrams of the PRACH repeated transmission device provided in the embodiment of the present application. As shown in FIG. 6, the PRACH repeated transmission device 600 includes:

The first receiving unit 610 is configured to receive a physical downlink control channel PDCCH;

The first processing unit 620 is configured to perform repeated transmission 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 PRACH retransmission;

The second indication information used to determine the RO resource of the random access transmission opportunity;

Wherein, the random access transmission opportunity (RO) resource is used for the repeated transmission of the PRACH.

In the embodiment of the present application, the PRACH retransmission is performed according to the received PDCCH, and the PRACH retransmission can be triggered through the PDCCH, thereby optimizing the random access procedure.

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

An index value for PRACH transmission, where the index value for PRACH transmission is configured as a preamble index value for performing repeated PRACH transmission;

an uplink UL/supplementary uplink SUL indication field, the UL/SUL indication field is interpreted by the terminal as indicating the repeated transmission of the PRACH;

One or more code points in the PRACH mask index information domain, where the one or more code points are used to indicate the repeated transmission of the PRACH;

A first bit field, where the first bit field is used to indicate the repeated transmission of the PRACH.

The embodiment of the present application provides a design scheme of the PDCCH indicating the DCI of the repeated transmission of the PRACH, which realizes the triggering of the repeated transmission of the PRACH through the PDCCH, thereby optimizing the random access procedure.

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

PRACH transmission associated synchronization signal block SSB index value and RO index value;

A second bit field, where the second bit field is used to indicate the RO set corresponding to the RO resource;

A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource.

The embodiment of the present application provides a design scheme for the PDCCH to indicate the DCI of the PRACH retransmission resource, and implements the triggering of the PRACH retransmission through the PDCCH, thereby optimizing the random access procedure.

Optionally, performing repeated transmission of a physical random access channel PRACH according to the PDCCH includes:

According to the synchronization signal block SSB index value and RO index value associated with the PRACH transmission, determine the RO resources corresponding to M times of PRACH repeated transmission, where M is a positive integer greater than 1, and M is configured by the network side device.

Optionally, the determining, according to the SSB index value and RO index value associated with the PRACH transmission, RO resources corresponding to M times of PRACH repeated transmission includes:

Determine the first RO in the RO resource according to the SSB index value and the RO index value associated with the PRACH transmission;

A subsequent RO of the RO resource is determined according to the first RO.

Optionally, the subsequent RO satisfies one of the following:

The subsequent ROs are M-1 consecutive ROs having the same frequency position as the first RO;

The subsequent RO is the RO associated with the M-1 SSBs sent in the order of SSB index values after the SSB associated with the first RO;

The subsequent RO and the first RO belong to the same RO set, where the RO set is either configured or predefined by the network side device and includes multiple ROs;

The subsequent ROs are M-1 ROs associated with the same SSB as the first RO.

Optionally, the determining, according to the SSB index value and RO index value associated with the PRACH transmission, RO resources corresponding to M times of PRACH repeated transmission includes:

Determine an RO corresponding to the SSB indicated by the PDCCH according to the SSB index value and the RO index value associated with the PRACH transmission;

According to the RO set configured by the network side device, determine a first RO set in which an RO corresponding to the SSB indicated by the PDCCH is located;

Determine M-1 ROs from the first RO set, and use one RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs as RO resources corresponding to the M times of repeated PRACH transmission.

In the embodiment of the present application, according to the received PRACH repeated transmission indication in the PDCCH, it is determined that the network side device indicates the PRACH repeated transmission, and the PRACH repeated transmission can be determined according to the SSB index value and the RO index value associated with the PRACH transmission in the PDCCH The RO resources can be used to trigger PRACH retransmission through the PDCCH, thereby optimizing the random access process.

Optionally, performing repeated transmission of a physical random access channel PRACH according to the PDCCH includes:

According to the indication of the second bit field, determine a second RO set from multiple RO sets configured by the network side device;

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

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

The embodiment of the present application provides a DCI design scheme for indicating PRACH retransmission resources, which can trigger PRACH retransmission through the PDCCH, thereby optimizing the random access procedure.

Optionally, performing repeated transmission of a physical random access channel PRACH according to the PDCCH includes:

determining the RO resource according to the target parameter;

Wherein, the target parameters include one of the following:

A frequency resource location corresponding to the RO resource;

The remainder of the RO index value corresponding to the RO resource.

Optionally, the determining the RO resource according to the target parameter includes one of the following:

According to the frequency resource position corresponding to the RO resource, determine N ROs with the same frequency resource position, and use the N RO resources with the same frequency resource position as the RO resource for the repeated transmission of the PRACH;

Determine N RO index values according to the remainder of the RO index values corresponding to the RO resources, and use the N ROs corresponding to the N RO index values as RO resources for repeated transmission of the PRACH;

Wherein, N is a positive integer.

The embodiment of the present application provides another DCI design scheme for indicating PRACH retransmission resources, which can trigger PRACH retransmission through the PDCCH, thereby optimizing the random access procedure.

The PRACH retransmission device provided in the embodiment of the present application further designs DCI, and introduces a new mechanism for determining PRACH retransmission resources, supports the mechanism of PDCCH triggering PRACH retransmission, and can optimize the random access process.

The PRACH retransmission device in the embodiment of the present application may be a device, a device with an operating system or an electronic device, or a component, an integrated circuit, or a chip in a terminal. The apparatus or electronic equipment may be a mobile terminal or a non-mobile terminal. Exemplarily, the mobile terminal may include but not limited to the types of terminals 11 listed above, and the non-mobile terminal may be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television ( television, TV), teller machines or self-service machines, etc., are not specifically limited in this embodiment of the present application.

The PRACH retransmission device provided in the embodiment of the present application can realize each process realized by the method embodiment in FIG. 4 and achieve the same technical effect. In order to avoid repetition, details are not repeated here.

FIG. 7 is the second structural diagram of the PRACH repeated transmission device provided by the embodiment of the present application. As shown in FIG. 7, the PRACH repeated transmission device 700 includes:

The first sending unit 710 is configured to send a physical downlink control channel PDCCH to the terminal;

Wherein, the PDCCH includes at least one of the following:

First indication information for instructing the terminal to perform PRACH retransmission;

The second indication information used to determine the RO resource of the random access transmission opportunity;

Wherein, the random access transmission opportunity (RO) resource is used for the repeated transmission of the PRACH.

In the embodiment of the present application, the PDCCH is sent to the terminal, and the PDCCH includes at least one of the PRACH repeated transmission indication and the PRACH repeated transmission resource indication, so that the terminal can determine the information of the PRACH repeated transmission, thereby realizing triggering the PRACH repeated transmission through the PDCCH , which can optimize the random access process.

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

An index value for PRACH transmission, where the index value for PRACH transmission is configured as a preamble index value for performing repeated PRACH transmission;

an uplink UL/supplementary uplink SUL indication field, the UL/SUL indication field is interpreted by the terminal as indicating the repeated transmission of the PRACH;

One or more code points in the PRACH mask index information domain, where the one or more code points are used to indicate the repeated transmission of the PRACH;

A first bit field, where the first bit field is used to indicate the repeated transmission of the PRACH.

The embodiment of the present application provides a design scheme of the PDCCH indicating the DCI of the repeated transmission of the PRACH, which realizes the triggering of the repeated transmission of the PRACH through the PDCCH, thereby optimizing the random access process.

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

PRACH transmission associated synchronization signal block SSB index value and RO index value;

A second bit field, where the second bit field is used to indicate the RO set corresponding to the RO resource;

A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource.

The embodiment of the present application provides a DCI design scheme for indicating PRACH retransmission resources, which can trigger PRACH retransmission through the PDCCH, thereby optimizing the random access procedure.

Optionally, the device also includes:

The second sending unit is configured to send at least one piece of RO set information to the terminal, where the RO set information is used to indicate the RO set in which the terminal can use RO resources for repeated PRACH transmission.

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

Optionally, the target parameters include one of the following:

A frequency resource location corresponding to the RO resource;

The remainder of the RO index value corresponding to the RO resource.

The PRACH retransmission device provided by the embodiment of the present application further designs DCI, and introduces a new mechanism for determining PRACH retransmission resources, supports the mechanism of PDCCH triggering PRACH retransmission, and can optimize the random access process.

The PRACH retransmission device in the embodiment of the present application may be a device, a device with an operating system or a network-side device, or may be a component, an integrated circuit, or a chip in the network-side device.

The PRACH retransmission device provided in the embodiment of the present application can realize each process realized by the method embodiment in FIG. 5 and achieve the same technical effect. To avoid repetition, details are not repeated here.

Optionally, as shown in FIG. 8 , this embodiment of the present application further provides a communication device 800, including a processor 801, a memory 802, and programs or instructions stored in the memory 802 and operable on the processor 801, For example, when the communication device 800 is a terminal, when the program or instruction is executed by the processor 801, each process of the above PRACH repeated transmission method embodiment can be realized, and the same technical effect can be achieved. When the communication device 800 is a network-side device, when the program or instruction is executed by the processor 801, each process of the above PRACH repeated transmission method embodiment can be achieved, and the same technical effect can be achieved. To avoid repetition, details are not repeated here.

The embodiment of the present application also provides a terminal, including a processor and a communication interface, the communication interface is used to receive the physical downlink control channel PDCCH, and the processor is used to perform repeated transmission of the PRACH according to the PDCCH, wherein the PDCCH includes at least one of the following Item: the first indication information used to instruct the terminal to perform PRACH repeated transmission; the second indication information used to determine the random access transmission opportunity RO resource; wherein, the random access transmission opportunity RO resource is used for the PRACH Repeat transmission. This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment, and each implementation process and implementation mode of the above-mentioned method embodiment can be applied to this terminal embodiment, and can achieve the same technical effect. Specifically, FIG. 9 is a schematic diagram of a hardware structure of a terminal implementing an embodiment of the present application.

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

Those skilled in the art can understand that the terminal 900 can also include a power supply (such as a battery) for supplying power to various components, and the power supply can be logically connected to the processor 910 through the power management system, so as to manage charging, discharging, and power consumption through the power management system. Management and other functions. The terminal structure shown in FIG. 9 does not constitute a limitation on the terminal, and the terminal may include more or fewer components than shown in the figure, or combine some components, or arrange different components, which will not be repeated here.

It should be understood that, in the embodiment of the present application, the input unit 904 may include a graphics processor (Graphics Processing Unit, GPU) 9041 and a microphone 9042, and the graphics processor 9041 is used for the image capture device ( Such as the image data of the still picture or video obtained by the camera) for processing. The display unit 906 may include a display panel 9061, and the display panel 9061 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 two parts, 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, switch buttons, etc.), trackballs, mice, and joysticks, which will not be repeated here.

In the embodiment of the present application, the radio frequency unit 901 receives the downlink data from the network side device, and processes it to the processor 910; in addition, sends the uplink data to the network side device. Generally, 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, and the like.

The memory 909 can be used to store software programs or instructions as well as various data. The memory 909 may mainly include a program or instruction storage area and a data storage area, wherein the program or instruction storage area may store an operating system, an application program or instructions required by at least one function (such as a sound playback function, an image playback function, etc.) and the like. In addition, the memory 909 may include a high-speed random access memory, and may also include a nonvolatile memory, wherein the nonvolatile memory may be a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM) , PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. For example at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device.

The processor 910 may include one or more processing units; optionally, the processor 910 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, application programs or instructions, etc., Modem processors mainly handle wireless communications, such as baseband processors. It can be understood that the foregoing modem processor may not be integrated into the processor 910 .

Wherein, the radio frequency unit 901 is used to receive the physical downlink control channel PDCCH;

The processor 910 is configured to perform repeated transmission 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 PRACH retransmission;

The second indication information used to determine the RO resource of the random access transmission opportunity;

Wherein, the random access transmission opportunity (RO) resource is used for the repeated transmission of the PRACH.

In the embodiment of the present application, the PRACH retransmission is performed according to the received PDCCH, and the PRACH retransmission can be triggered through the PDCCH, thereby optimizing the random access procedure.

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

An index value for PRACH transmission, where the index value for PRACH transmission is configured as a preamble index value for performing repeated PRACH transmission;

an uplink UL/supplementary uplink SUL indication field, the UL/SUL indication field is interpreted by the terminal as indicating the repeated transmission of the PRACH;

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

A first bit field, where the first bit field is used to indicate the repeated transmission of the PRACH.

The embodiment of the present application provides a design scheme of the PDCCH indicating the DCI of the repeated transmission of the PRACH, which realizes the triggering of the repeated transmission of the PRACH through the PDCCH, thereby optimizing the random access procedure.

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

PRACH transmission associated synchronization signal block SSB index value and RO index value;

A second bit field, where the second bit field is used to indicate the RO set corresponding to the RO resource;

A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource.

Optionally, the processor 910 is also used for:

According to the synchronization signal block SSB index value and RO index value associated with the PRACH transmission, determine the RO resources corresponding to M times of PRACH repeated transmission, where M is a positive integer greater than 1, and M is configured by the network side device.

Optionally, the determining, according to the SSB index value and RO index value associated with the PRACH transmission, RO resources corresponding to M times of PRACH repeated transmission includes:

Determine the first RO in the RO resource according to the SSB index value and the RO index value associated with the PRACH transmission;

A subsequent RO of the RO resource is determined according to the first RO.

Optionally, the subsequent RO satisfies one of the following:

The subsequent ROs are M-1 consecutive ROs having the same frequency position as the first RO;

The subsequent RO is the RO associated with the M-1 SSBs sent in the order of SSB index values after the SSB associated with the first RO;

The subsequent RO and the first RO belong to the same RO set, where the RO set is either configured or predefined by the network side device and includes multiple ROs;

The subsequent ROs are M-1 ROs associated with the same SSB as the first RO.

Optionally, the determining, according to the SSB index value and RO index value associated with the PRACH transmission, RO resources corresponding to M times of PRACH repeated transmission includes:

Determine an RO corresponding to the SSB indicated by the PDCCH according to the SSB index value and the RO index value associated with the PRACH transmission;

According to the RO set configured by the network side device, determine a first RO set in which an RO corresponding to the SSB indicated by the PDCCH is located;

Determine M-1 ROs from the first RO set, and use one RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs as RO resources corresponding to the M times of repeated PRACH transmission.

In the embodiment of the present application, the terminal determines that the network side device indicates the PRACH repeated transmission according to the received PRACH repeated transmission indication in the PDCCH, and can determine the PRACH repeated according to the SSB index value and the RO index value associated with the PRACH transmission in the PDCCH The transmitted RO resources can trigger PRACH repeated transmission through PDCCH, so as to optimize the random access process.

Optionally, the processor 910 is also used for:

According to the indication of the second bit field, determine a second RO set from multiple RO sets configured by the network side device;

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

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

The embodiment of the present application provides a DCI design scheme for indicating PRACH retransmission resources, which can trigger PRACH retransmission through the PDCCH, thereby optimizing the random access procedure.

Optionally, the processor 910 is also used for:

determining the RO resource according to the target parameter;

Wherein, the target parameters include one of the following:

A frequency resource location corresponding to the RO resource;

The remainder of the RO index value corresponding to the RO resource.

Optionally, the determining the RO resource according to the target parameter includes one of the following:

According to the frequency resource position corresponding to the RO resource, determine N ROs with the same frequency resource position, and use the N RO resources with the same frequency resource position as the RO resource for the repeated transmission of the PRACH;

Determine N RO index values according to the remainder of the RO index values corresponding to the RO resources, and use the N ROs corresponding to the N RO index values as RO resources for repeated transmission of the PRACH;

Wherein, N is a positive integer.

The embodiment of the present application provides another DCI design scheme for indicating PRACH retransmission resources, which can trigger PRACH retransmission through the PDCCH, thereby optimizing the random access procedure.

In the embodiment of the present application, DCI is further designed, and a new mechanism for determining PRACH retransmission resources is newly introduced, which supports the mechanism of PDCCH triggering PRACH retransmission, and can optimize the random access process.

The embodiment of the present application also provides a network side device, including a processor and a communication interface, and the communication interface is used to send the physical downlink control channel PDCCH to the terminal; wherein, the PDCCH includes at least one of the following items: used to instruct the terminal to perform First indication information for repeated PRACH transmission; second indication information for determining random access transmission opportunity RO resources; wherein, the random access transmission opportunity RO resource is used for the PRACH repeated transmission. The network-side device embodiment corresponds to the above-mentioned network-side device method embodiment, and each implementation process and implementation mode of the above-mentioned method embodiment can be applied to this network-side device embodiment, and can achieve the same technical effect.

Specifically, the embodiment of the present application also provides a network side device. As shown in FIG. 10 , the network side device 1000 includes: an antenna 1001 , a radio frequency device 1002 , and a baseband device 1003 . The antenna 1001 is connected to the radio frequency device 1002 . In the uplink direction, the radio frequency device 1002 receives information through the antenna 1001, and sends the received information to the baseband device 1003 for processing. In the downlink direction, the baseband device 1003 processes the information to be sent and sends it to the radio frequency device 1002 , and the radio frequency device 1002 processes the received information and sends it out through the antenna 1001 .

The foregoing frequency band processing device may be located in the baseband device 1003 , and the method performed by the network side device in the above embodiments may be implemented in the baseband device 1003 , and the baseband device 1003 includes a processor 1004 and a memory 1005 .

The baseband device 1003 may include, for example, at least one baseband board, and the baseband board is provided with a plurality of chips, as shown in FIG. The operation of the network side device shown in the above method embodiments.

The baseband device 1003 may further include a network interface 1006 for exchanging information with the radio frequency device 1002, and the interface is, for example, a common public radio interface (CPRI for short).

Specifically, the network side device in the embodiment of the present invention further includes: instructions or programs stored in the memory 1005 and operable on the processor 1004, and the processor 1004 calls the instructions or programs in the memory 1005 to execute the modules shown in FIG. 7 To avoid duplication, the method of implementation and to achieve the same technical effect will not be repeated here.

The embodiment of the present application also provides a readable storage medium, the readable storage medium stores a program or an instruction, and when the program or instruction is executed by the processor, each process of the above PRACH repeated transmission method embodiment is implemented, and can achieve The same technical effects are not repeated here to avoid repetition.

Wherein, the processor is the processor in the terminal described in the foregoing embodiments. The readable storage medium includes computer readable storage medium, such as computer read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

The embodiment of the present application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the above embodiment of the PRACH repeated transmission method Each process, and can achieve the same technical effect, in order to avoid repetition, will not repeat them here.

It should be understood that the chip mentioned in the embodiment of the present application may also be called a system-on-chip, a system-on-chip, a system-on-a-chip, or a system-on-a-chip.

The embodiment of the present application also provides a computer program/program product, the computer program/program product is stored in a non-transitory storage medium, and the program/program product is executed by at least one processor to implement the above-mentioned system message Each process of the reporting method embodiment of the report can achieve the same technical effect, so in order to avoid repetition, details are not repeated here.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions are performed, for example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the technical solution of the present application can be embodied in the form of computer software products, which are stored in a storage medium (such as ROM/RAM, magnetic disk, etc.) , optical disc), including several instructions to enable a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Under the inspiration of this application, without departing from the purpose of this application and the scope of protection of the claims, many forms can also be made, all of which belong to the protection of this application.

Claims (35)

A PRACH repeated transmission method, comprising: The terminal receives the physical downlink control channel PDCCH; The terminal performs repeated transmission 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 PRACH retransmission; The second indication information used to determine the RO resource of the random access transmission opportunity; Wherein, the random access transmission opportunity (RO) resource is used for the repeated transmission of the PRACH. The PRACH repeated transmission method according to claim 1, wherein the first indication information includes at least one of the following: An index value for PRACH transmission, where the index value for PRACH transmission is configured as a preamble index value for performing repeated PRACH transmission; an uplink UL/supplementary uplink SUL indication field, the UL/SUL indication field is interpreted by the terminal as indicating the repeated transmission of the PRACH; One or more code points in the PRACH mask index information domain, where the one or more code points are used to indicate the repeated transmission of the PRACH; A first bit field, where the first bit field is used to indicate the repeated transmission of the PRACH. The PRACH repeated transmission method according to claim 1 or 2, wherein the second indication information includes at least one of the following: PRACH transmission associated synchronization signal block SSB index value and RO index value; A second bit field, where the second bit field is used to indicate the RO set corresponding to the RO resource; A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource. The PRACH repeated transmission method according to claim 3, wherein the terminal performs physical random access channel PRACH repeated transmission according to the PDCCH, including: The terminal determines RO resources corresponding to M times of PRACH repeated transmission according to 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 PRACH repeated transmission method according to claim 4, wherein, according to the SSB index value and RO index value associated with the PRACH transmission, the terminal determines the RO resource corresponding to M times of PRACH repeated transmission, including: The terminal determines the first RO in the RO resource according to the SSB index value and the RO index value associated with the PRACH transmission; The terminal determines a subsequent RO of the RO resource according to the first RO. The PRACH repeated transmission method according to claim 5, wherein the subsequent RO satisfies one of the following: The subsequent ROs are M-1 consecutive ROs having the same frequency position as the first RO; The subsequent RO is the RO associated with the M-1 SSBs sent in the order of SSB index values after the SSB associated with the first RO; The subsequent RO and the first RO belong to the same RO set, where the RO set is configured or predefined by the network side device and includes multiple ROs; The subsequent ROs are M-1 ROs associated with the same SSB as the first RO. The PRACH repeated transmission method according to claim 4, wherein, according to the SSB index value and RO index value associated with the PRACH transmission, the terminal determines the RO resource corresponding to M times of PRACH repeated transmission, including: The terminal determines an RO corresponding to the SSB indicated by the PDCCH according to the SSB index value and the RO index value associated with the PRACH transmission in the PDCCH; The terminal determines the first RO set in which an RO corresponding to the SSB indicated by the PDCCH is located according to 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 times of PRACH repeated transmission . The PRACH repeated transmission method according to claim 3, wherein the terminal performs physical random access channel PRACH repeated transmission according to the PDCCH, including: 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; The terminal uses multiple ROs in the second RO set as the RO resources. The PRACH repeated transmission method according to claim 8, wherein the second bit field is a code point in the PRACH mask index information field. The PRACH repeated transmission method according to claim 3, wherein the terminal performs physical random access channel PRACH repeated transmission according to the PDCCH, including: The terminal determines the RO resource according to the target parameter; Wherein, the target parameters include one of the following: A frequency resource location corresponding to the RO resource; The remainder of the RO index value corresponding to the RO resource. The PRACH repeated transmission method according to claim 10, wherein the terminal determines the RO resource according to the target parameter, including one of the following: The terminal determines N ROs with the same frequency resource positions according to the frequency resource positions corresponding to the RO resources, and uses the N ROs with the same frequency resource positions as the RO resources; The terminal determines N RO index values according to 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; Wherein, N is a positive integer. A PRACH repeated transmission method, comprising: The network side device sends the physical downlink control channel PDCCH to the terminal; Wherein, the PDCCH includes at least one of the following: First indication information for instructing the terminal to perform PRACH retransmission; The second indication information used to determine the RO resource of the random access transmission opportunity; Wherein, the random access transmission opportunity (RO) resource is used for the repeated transmission of the PRACH. The PRACH repeated transmission method according to claim 12, wherein the first indication information includes at least one of the following: An index value for PRACH transmission, where the index value for PRACH transmission is configured as a preamble index value for performing repeated PRACH transmission; an uplink UL/supplementary uplink SUL indication field, the UL/SUL indication field is interpreted by the terminal as indicating the repeated transmission of the PRACH; One or more code points in the PRACH mask index information field, where the code points are used to indicate the repeated transmission of the PRACH; A first bit field, where the first bit field is used to indicate the repeated transmission of the PRACH. The PRACH repeated transmission method according to claim 12 or 13, wherein the second indication information includes at least one of the following: PRACH transmission associated synchronization signal block SSB index value and RO index value; A second bit field, where the second bit field is used to indicate the RO set corresponding to the RO resource; A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource. The PRACH repeated transmission method according to claim 14, wherein the method further comprises: Sending at least one piece of RO set information to the terminal, where the RO set information is used to indicate the RO set where the RO resources that the terminal can use for PRACH repeated transmission are located. The PRACH repeated transmission method according to claim 14, wherein the second bit field is a code point in the PRACH mask index information field. The PRACH repeated transmission method according to claim 14, wherein the target parameters include one of the following: A frequency resource location corresponding to the RO resource; The remainder of the RO index value corresponding to the RO resource. A PRACH repeated transmission device, comprising: A first receiving unit, configured to receive a physical downlink control channel PDCCH; The first processing unit is configured to perform repeated transmission of a physical random access channel PRACH according to the PDCCH; Wherein, the PDCCH includes at least one of the following: First indication information used to instruct the terminal to perform PRACH retransmission; The second indication information used to determine the RO resource of the random access transmission opportunity; Wherein, the random access transmission opportunity (RO) resource is used for the repeated transmission of the PRACH. The PRACH repeat transmission device according to claim 18, wherein the first indication information includes at least one of the following: An index value for PRACH transmission, where the index value for PRACH transmission is configured as a preamble index value for performing repeated PRACH transmission; an uplink UL/supplementary uplink SUL indication field, the UL/SUL indication field is interpreted by the terminal as indicating the repeated transmission of the PRACH; One or more code points in the PRACH mask index information domain, where the one or more code points are used to indicate the repeated transmission of the PRACH; A first bit field, where the first bit field is used to indicate the repeated transmission of the PRACH. The PRACH repeat transmission device according to claim 18 or 19, wherein the second indication information includes at least one of the following: PRACH transmission associated synchronization signal block SSB index value and RO index value; A second bit field, where the second bit field is used to indicate the RO set corresponding to the RO resource; A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource. The PRACH retransmission device according to claim 20, wherein the retransmission of the Physical Random Access Channel PRACH according to the PDCCH includes: According to the synchronization signal block SSB index value and RO index value associated with the PRACH transmission, determine the RO resources corresponding to M times of PRACH repeated transmission, where M is a positive integer greater than 1, and M is configured by the network side device. The PRACH repeated transmission device according to claim 21, wherein, according to the SSB index value and RO index value associated with the PRACH transmission, determining the RO resource corresponding to M times of PRACH repeated transmission includes: Determine the first RO in the RO resource according to the SSB index value and the RO index value associated with the PRACH transmission; A subsequent RO of the RO resource is determined according to the first RO. The PRACH repeated transmission device according to claim 22, wherein the subsequent RO satisfies one of the following: The subsequent ROs are M-1 consecutive ROs having the same frequency position as the first RO; The subsequent RO is the RO associated with the M-1 SSBs sent in the order of SSB index values after the SSB associated with the first RO; The subsequent RO and the first RO belong to the same RO set, where the RO set is either configured or predefined by the network side device and includes multiple ROs; The subsequent ROs are M-1 ROs associated with the same SSB as the first RO. The PRACH repeated transmission device according to claim 21, wherein, according to the SSB index value and RO index value associated with the PRACH transmission, determining the RO resource corresponding to M times of PRACH repeated transmission includes: Determine an RO corresponding to the SSB indicated by the PDCCH according to the SSB index value and the RO index value associated with the PRACH transmission; According to the RO set configured by the network side device, determine a first RO set in which an RO corresponding to the SSB indicated by the PDCCH is located; Determine M-1 ROs from the first RO set, and use one RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs as RO resources corresponding to the M times of repeated PRACH transmission. The PRACH retransmission device according to claim 20, wherein the retransmission of the Physical Random Access Channel PRACH according to the PDCCH includes: According to the indication of the second bit field, determine a second RO set from multiple RO sets configured by the network side device; Multiple ROs in the second RO set are used as the RO resources. The PRACH repeated transmission device according to claim 25, wherein the second bit field is a code point in the PRACH mask index information field. The PRACH retransmission device according to claim 20, wherein the retransmission of the Physical Random Access Channel PRACH according to the PDCCH includes: Determine the RO resource according to the target parameter indicated by the PDCCH; Wherein, the target parameters include one of the following: A frequency resource location corresponding to the RO resource; The remainder of the RO index value corresponding to the RO resource. The PRACH repeat transmission device according to claim 27, wherein said determining said RO resource according to the target parameter indicated by said PDCCH includes one of the following: According to the frequency resource position corresponding to the RO resource, determine N ROs with the same frequency resource position, and use the N RO resources with the same frequency resource position as the RO resource for the repeated transmission of the PRACH; Determine N RO index values according to the remainder of the RO index values corresponding to the RO resources, and use the N ROs corresponding to the N RO index values as RO resources for repeated transmission of the PRACH; Wherein, N is a positive integer. A PRACH repeated transmission device, comprising: The first sending unit is configured to send a physical downlink control channel PDCCH to the terminal; Wherein, the PDCCH includes at least one of the following: First indication information for instructing the terminal to perform PRACH retransmission; The second indication information used to determine the RO resource of the random access transmission opportunity; Wherein, the random access transmission opportunity (RO) resource is used for the repeated transmission of the PRACH. The PRACH repeated transmission device according to claim 29, wherein the first indication information includes at least one of the following: An index value for PRACH transmission, where the index value for PRACH transmission is configured as a preamble index value for performing repeated PRACH transmission; an uplink UL/supplementary uplink SUL indication field, the UL/SUL indication field is interpreted by the terminal as indicating the repeated transmission of the PRACH; One or more code points in the PRACH mask index information field, where the code points are used to indicate the repeated transmission of the PRACH; A first bit field, where the first bit field is used to indicate the repeated transmission of the PRACH. The PRACH repeat transmission device according to claim 29 or 30, wherein the second indication information includes at least one of the following: PRACH transmission associated synchronization signal block SSB index value and RO index value; A second bit field, where the second bit field is used to indicate the RO set corresponding to the RO resource; A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource. The PRACH repeat transmission device according to claim 31, further comprising: The second sending unit is configured to send at least one piece of RO set information to the terminal, where the RO set information is used to indicate the RO set in which the terminal can use RO resources for repeated PRACH transmission. A terminal, comprising a processor, a memory, and a program or instruction stored in the memory and operable on the processor, when the program or instruction is executed by the processor, any of claims 1 to 11 can be realized. A step of the PRACH repeated transmission method. A network side device, comprising a processor, a memory, and a program or instruction stored on the memory and operable on the processor, when the program or instruction is executed by the processor, it realizes the requirements of claims 12 to 12. Steps of the PRACH repeated transmission method described in any one of 17. A readable storage medium, on which a program or an instruction is stored, and when the program or instruction is executed by a processor, the steps of the PRACH repeated transmission method according to any one of claims 1 to 11 are implemented, or The steps of realizing the PRACH repeated transmission method as described in any one of claims 12 to 17.

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