CN112153741A - Method, terminal and network equipment for triggering random access - Google Patents

Abstract

A method, terminal and network device for triggering random access, the method comprising: receiving downlink control information sent by a network; when the random access procedure triggered by the downlink control information is a 2-step random access procedure, according to Step random access procedure initiates random access. In the method, terminal, and network device for triggering random access provided by the embodiments of the present invention, the network device can trigger the terminal to initiate a 2-step random access or a 4-step random access process, thereby realizing a 2-step random access triggered by the network device. The solution of the entry process can be applied to operations such as terminal time synchronization adjustment or secondary cell addition, so as to reduce the processing delay of the above operations.

Description

A method, terminal and network device for triggering random access

technical field

The present invention relates to the technical field of mobile communication, in particular to a method, terminal and network device for triggering random access.

Background technique

In the prior art, the process for a terminal to initiate contention-based random access (CBRA, Contention-based RandomAccess) is roughly as follows:

1) The terminal sends an uplink signal containing a preamble sequence (Preamble) on the resources of the Physical Random Access Channel (PRACH, Physical Random Access Channel), which is called Msg1;

2) The terminal receives the random access response (RAR, Random Access Response) sent by the base station side, which is called Msg2;

3) The terminal sends uplink data on the uplink time-frequency resource indicated by the RAR, which is called Msg3;

4) The terminal receives downlink data sent by the base station side, and the downlink data includes contention resolution related information, which is called Msg4.

The above process is called a 4-step random access (4-step RACH) process.

In order to reduce the random access delay, the prior art also proposes to introduce a 2-step random access (2-step RACH process, as shown in FIG. 1 .

In the 2-step random access procedure, the terminal sends Msg1 and Msg3 in the original 4-step random access procedure in one step, which is called MsgA; and combines Msg2 and Msg4 in the original 4-step random access procedure into MsgB.

SUMMARY OF THE INVENTION

At least one embodiment of the present invention provides a method, a terminal, and a network device for triggering random access, which realizes a 2-step random access process triggered by the network device.

According to an aspect of the present invention, at least one embodiment provides a method for triggering random access, including:

Receive downlink control information sent by the network;

When the random access procedure triggered by the downlink control information is a 2-step random access procedure, random access is initiated according to the 2-step random access procedure.

According to at least one embodiment of the present invention, the frequency domain resource allocation fields of the downlink control information are all 1s.

According to at least one embodiment of the present invention, after receiving the downlink control information, the method further includes:

According to at least one preset bit in the downlink control information, it is determined that the random access procedure triggered by the downlink control information is a 2-step random access procedure or a 4-step random access procedure.

According to at least one embodiment of the present invention, when the random access procedure triggered by the downlink control information indication is a 2-step random access procedure, the downlink control information further includes at least one of the following parameters:

pilot index;

Subcarrier spacing or system parameter number indication information;

Waveform indication information;

modulation coding strategy;

Frequency hopping indication information for indicating whether the physical uplink shared channel PUSCH is frequency hopping;

Demodulation reference signal port.

According to at least one embodiment of the present invention, the method further includes:

In the process of initiating random access according to the 2-step random access procedure, the transmission of pilot and/or PUSCH is performed according to the parameters.

According to another aspect of the present invention, a method for triggering random access is also provided, applied to a network device, including:

Send downlink control information to the terminal, where the downlink control information is used to trigger a 2-step random access procedure;

In response to the 2-step random access procedure initiated by the terminal according to the downlink control information, a connection with the terminal is established.

According to at least one embodiment of the present invention, before sending the downlink control information, the method further includes:

When the network device initiates the target operation for the terminal, it is determined that the random access process to be initiated is a 2-step random access process or a 4-step random access process according to whether the operation delay requirement of the target operation is lower than a preset threshold. Step random access procedure.

According to at least one embodiment of the present invention, the target operation includes at least one of the following operations:

Reacquire the time adjustment amount of the terminal;

adding a secondary cell for the terminal;

The terminal is located.

According to at least one embodiment of the present invention, the frequency domain resource allocation fields of the downlink control information are all set to 1.

According to at least one embodiment of the present invention, at least one preset bit in the downlink control information is used to indicate that the triggered random access procedure is a 2-step random access procedure or a 4-step random access procedure.

According to at least one embodiment of the present invention, when the random access procedure triggered by the downlink control information is a 2-step random access, the downlink control information further includes at least one of the following parameters:

pilot index;

Subcarrier spacing or system parameter number indication information;

Waveform indication information;

modulation coding strategy;

Frequency hopping indication information used to indicate whether frequency hopping;

Demodulation reference signal port.

According to another aspect of the present invention, a terminal is also provided, comprising:

Transceiver for receiving downlink control information sent by the network

The processor is configured to initiate random access according to the 2-step random access process when the random access process triggered by the downlink control information is a 2-step random access process.

According to at least one embodiment of the present invention, the frequency domain resource allocation fields of the downlink control information are all 1s.

According to at least one embodiment of the present invention, the processor is further configured to determine, according to at least one preset bit in the downlink control information, that the random access procedure triggered by the downlink control information is a 2-step random access flow or a 4-step random access flow.

According to at least one embodiment of the present invention, when the random access procedure triggered by the downlink control information indication is a 2-step random access procedure, the downlink control information further includes at least one of the following parameters:

pilot index;

Subcarrier spacing or system parameter number indication information;

Waveform indication information;

modulation coding strategy;

Frequency hopping indication information for indicating whether the physical uplink shared channel PUSCH is frequency hopping;

Demodulation reference signal port.

According to at least one embodiment of the present invention, the processor is further configured to perform pilot and/or PUSCH transmission according to the parameters during the process of initiating random access according to the 2-step random access procedure.

According to another aspect of the present invention, at least one embodiment provides a terminal, comprising: a memory, a processor, and a program stored on the memory and executable on the processor, the program being implemented when executed by the processor The steps of the method for triggering random access as described above.

According to another aspect of the present invention, at least one embodiment provides a network device, comprising:

a transceiver, configured to send downlink control information to the terminal, where the downlink control information is used to trigger a 2-step random access procedure;

The processor is configured to establish a connection with the terminal in response to the 2-step random access procedure initiated by the terminal according to the downlink control information.

According to at least one embodiment of the present invention, the processor is further configured to, when initiating a target operation for the terminal, determine an operation delay that needs to be initiated according to whether the operation delay requirement of the target operation is lower than a preset threshold. The random access procedure is a 2-step random access procedure or a 4-step random access procedure.

According to at least one embodiment of the present invention, the target operation includes at least one of the following operations:

Reacquire the time adjustment amount of the terminal;

adding a secondary cell for the terminal;

The terminal is located.

According to at least one embodiment of the present invention, the frequency domain resource allocation fields of the downlink control information are all set to 1.

According to at least one embodiment of the present invention, at least one preset bit in the downlink control information is used to indicate that the triggered random access procedure is a 2-step random access procedure or a 4-step random access procedure.

According to at least one embodiment of the present invention, when the random access procedure triggered by the downlink control information is a 2-step random access, the downlink control information further includes at least one of the following parameters:

pilot index;

Subcarrier spacing or system parameter number indication information;

Waveform indication information;

modulation coding strategy;

Frequency hopping indication information used to indicate whether frequency hopping;

Demodulation reference signal port.

According to another aspect of the present invention, at least one embodiment provides a network device including: a memory, a processor, and a program stored on the memory and executable on the processor, when the program is executed by the processor The steps of the method for triggering random access as described above are implemented.

According to another aspect of the present invention, at least one embodiment provides a computer-readable storage medium, where a program is stored on the computer-readable storage medium, and when the program is executed by a processor, the above-mentioned method is implemented. step.

Compared with the prior art, in the method, terminal, and network device for triggering random access provided by the embodiments of the present invention, the network device can trigger the terminal to initiate a 2-step random access or a 4-step random access process, thereby realizing a The solution that the network device triggers the 2-step random access process can be applied to operations such as terminal time synchronization adjustment or secondary cell addition, to reduce the processing delay of the above operations.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating preferred embodiments only and are not to be considered limiting of the invention. Also, the same components are denoted by the same reference numerals throughout the drawings. In the attached image:

1 is a schematic diagram of a 2-step random access process in the prior art;

2 is a schematic diagram of an application scenario of an embodiment of the present invention;

3 is a flowchart of a method for triggering random access provided by an embodiment of the present invention;

4 is another flowchart of a method for triggering random access provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a terminal provided by an embodiment of the present invention;

FIG. 6 is another schematic structural diagram of a terminal provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a network device according to an embodiment of the present invention;

FIG. 8 is another schematic structural diagram of a network device according to an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be more thoroughly understood, and will fully convey the scope of the present invention to those skilled in the art.

The terms "first", "second" and the like in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the application described herein can, for example, be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices. In the description and the claims, "and/or" means at least one of the connected objects.

The following description provides examples and does not limit the scope, applicability, or configuration set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the spirit and scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to some examples may be combined in other examples.

A triggering method of the 4-step random access in the prior art can be triggered by a physical downlink control channel order (PDCCH order). When the terminal receives downlink control information (DCI, Downlink Control Information) (DCI format 1_0), it passes When the Cell-Radio Network Temporary Identify (C-RNTI, Cell-Radio Network Temporary Identify) is scrambled and all the bit fields of frequency domain resource allocation are 1, the PDCCH order triggers a 4-step random access procedure. The remaining bit field of the DCI is used to indicate random access parameters (including reserved bits), as shown in Table 1.

Table 1

In the above table, when the random access pilot index is all zeros, the SS/PBCH index and the PRACHMask index are reserved fields.

The network device can trigger a 4-step random access process for operations such as terminal time synchronization adjustment or secondary cell addition. At present, the prior art does not support the triggering of a 2-step random access procedure by a network device. Therefore, an embodiment of the present invention provides a method for triggering random access, which realizes that the 2-step random access procedure is triggered by a network device, and can Taking advantage of the low access delay of the 2-step access process, the processing delay of the above operations is reduced.

Please refer to FIGS. 2-3. FIG. 2 shows a block diagram of a wireless communication system to which an embodiment of the present invention can be applied. The wireless communication system includes a terminal 21 and a network device 22 . Referring to FIG. 3 , the method for triggering random access provided by an embodiment of the present invention, when applied to a terminal, includes:

Step 31: Receive downlink control information sent by the network.

Here, the format of the downlink control information may specifically be DCI_1_0. Specifically, the frequency domain resource allocation fields of the downlink control information are all 1 (a representation of the PDCCH order). Optionally, the downlink control information includes at least one preset bit for indicating a triggered access procedure, and the access procedure may include 2-step random access and 4-step random access. The at least one preset bit carries specific flow indication information of the random access procedure. In the step 31, the downlink control information sent by the network may be scrambled via the C-RNTI of the terminal.

According to at least one embodiment of the present invention, the at least one preset bit requires at least one bit. Considering that it is compatible with the triggering 4-step random access process in the prior art, the embodiment of the present invention can adopt the reserved bits that have not been used in the triggering 4-step random access process in the prior art, and indicate the reserved bits through the above-mentioned reserved bits. Triggered random access procedure (such as 2-step random access or 4-step random access procedure).

Taking the downlink control information shown in Table 1 as an example, in this embodiment of the present invention, the triggered random access procedure may be indicated by the last 10 bits (reserved bits) of the downlink control information. One of the bits, as indicated by the first bit. Generally, the corresponding relationship between the values of the above-mentioned bits and the random access procedure may be predetermined. In addition, in order to be compatible with the scheme of triggering a 4-step random access procedure, the procedure indication information can be indicated by the following correspondence: a value of "1" indicates that the trigger is a 2-step random access procedure; a value of "0" indicates that The trigger is a 4-step random access procedure. Please refer to Table 2, which provides a specific example of downlink control information that can be used in the embodiment of the present invention to trigger a 2-step random access procedure:

Table 2

Step 32, when the random access process triggered by the downlink control information is a 2-step random access process, initiate random access according to the 2-step random access process.

Here, the terminal may determine, according to at least one preset bit in the downlink control information, that the random access procedure triggered by the downlink control information is a 2-step random access procedure or a 4-step random access procedure. During specific reception, the terminal may use its own C-RNTI to descramble the downlink control information, and then parse out the indication information of the access procedure from the downlink control information. Specifically, the random access procedure corresponding to the value may be determined according to the value of the bit where the access procedure indication information is located, which may specifically be a 2-step random access procedure or a 4-step random access procedure. For example, when the triggered random access process is a 2-step random access process, according to the process shown in Figure 1, the terminal first sends MsgA to the network device, and then receives the MsgB returned by the network device, thereby completing the 2-step random access process . In addition, in order to save space, the specific steps of the 4-step random access procedure will not be repeated here.

Through the above steps, the terminal in the embodiment of the present invention can initiate a 2-step random access or a 4-step random access process according to the trigger of the network device, thereby realizing a solution in which the network device triggers the 2-step random access process. It is applied to operations such as terminal time synchronization adjustment or secondary cell addition, to reduce the processing delay of the above operations.

According to at least one embodiment of the present invention, when the access procedure indicated by the indication information is 2-step random access, the downlink control information sent by the network device may further include at least one of the following parameters:

pilot index;

Subcarrier spacing or system parameter (numerology) indication information;

Waveform indication information, used to indicate the waveform used by the terminal for transmission;

Modulation and Coding Scheme (MCS, Modulation and Coding Scheme);

Frequency hopping indication information used to indicate whether the PUSCH is frequency hopping;

A demodulation reference signal (DMRS, Demodulation Reference Signal) port;

and, indications of other functions or parameters.

Here, the system parameter (numerology) may include various contents, such as subcarrier interval, cyclic prefix (CP, Cyclic Prefix) length, transmission time interval (TTI, Transmission Time Interval) length, and the like.

In this way, in the above step 33, in the process of initiating the 2-step random access, the terminal transmits the pilot and/or PUSCH according to the parameters, for example, according to the downlink control information indicated The modulation and coding strategy is used for PUSCH transmission and so on.

The flow on the terminal side in the embodiment of the present invention has been described above. 4 , the method for triggering random access provided by an embodiment of the present invention, when applied to a network device, includes:

Step 41: Send downlink control information to the terminal, where the downlink control information is used to trigger a 2-step random access procedure.

Here, a network device (such as a base station) may determine whether a random access procedure of the terminal needs to be triggered and what type of random access procedure to trigger according to specific needs. In this embodiment of the present invention, before the above step 41, when initiating a target operation for the terminal, the network device may determine that a random access process of the terminal needs to be triggered, and, according to the target operation, the operation delay is affected. Whether the requirement is lower than the preset threshold, determine whether the random access procedure to be initiated is a 2-step random access procedure or a 4-step random access procedure, and when the random access procedure to be initiated is a 2-step random access procedure, enter In step 41, the downlink control information is sent. Specifically, the target operations include but are not limited to the following operations:

Reacquire the time adjustment amount of the terminal;

adding a secondary cell for the terminal;

The terminal is located.

For example, when the network device needs to send downlink data to the terminal, if it detects that the connection of the terminal is out of synchronization, that is, the uplink synchronization of the terminal is lost. The time adjustment amount (TA, Time Adjustment). Optionally, if the service delay requirement of the target service corresponding to the downlink data is lower than the preset threshold, the network device determines that the above-mentioned time adjustment amount needs to be obtained as soon as possible, and at this time, the network device can determine the random access process that needs to be initiated. It is a 2-step random access procedure.

For another example, when the network device adds a secondary cell for the terminal, it may be determined that a random access procedure of the terminal needs to be triggered. Optionally, if the network device needs to complete the addition of the secondary cell as soon as possible, it is determined that the random access procedure to be initiated is a 2-step random access procedure; otherwise, it is determined that the random access procedure to be initiated is a 4-step random access procedure.

Optionally, the frequency domain resource allocation fields of the downlink control information are all set to 1.

Optionally, at least one preset bit in the downlink control information may be used to indicate that the triggered random access procedure is a 2-step random access procedure or a 4-step random access procedure. For example, it is indicated by one of the last 10 bits of the downlink control information, such as the first bit of the last 10 bits.

Step 42, in response to the 2-step random access procedure initiated by the terminal according to the downlink control information, establish a connection with the terminal.

Through the above steps, the embodiment of the present invention realizes the triggering of the random access process of the terminal by the network device, and can trigger the 2-step random access process as required, so as to meet the processing delay requirements of different operations.

Optionally, in this embodiment of the present invention, when the random access procedure triggered by the downlink control information is a 2-step random access, the downlink control information further includes at least one of the following parameters to indicate the In the 2-step random access process, the terminal performs pilot and/or PUSCH transmission according to the following parameters:

pilot index;

Subcarrier spacing or system parameter (numerology) indication information;

Waveform indication information;

modulation coding strategy;

Frequency hopping indication information used to indicate whether the PUSCH is frequency hopping;

Demodulation reference signal port, etc.

The method for triggering a random access procedure according to the embodiment of the present invention is described above from the terminal and the network device side respectively. The above method will be described below through a specific example, which specifically includes:

1) The base station adds a secondary cell for user 1 and user 2 respectively, and needs to measure the uplink timing information of user 1 and user 2 to the base station of the secondary cell, so the user needs to be triggered to perform the RACH process.

2) The base station configures relevant parameters of 4-step RACH for user 1, and configures relevant parameters of 4-step RACH and 2-step RACH for user 2 at the same time.

3) The base station uses the PDCCH order to trigger user 1 to perform a 4-step RACH process. The specific DCI is scrambled by the C-RNTI of user 1, and the DCI information is shown in Table 3

table 3

Note that at this time, the access procedure indication is 0, which is the same as the value of the traditional reserved bit. Therefore, this design will not affect the mechanism of using the PDCCH to trigger the UE RACH procedure in the prior art.

4) The base station uses the PDCCH order to trigger user 2 to perform a 2-step RACH process. The specific DCI is scrambled by the C-RNTI of user 2, and the information of the DCI is shown in Table 4, which also indicates the modulation and coding of data transmission. Strategy (MCS), specifically the index number of the modulation and coding strategy, for example, the index is 2.

Table 4

5) User 1 performs a 4-step RACH flow according to the relevant information; User 2 performs a 2-step RACH flow according to the relevant information, wherein in msgA, the PUSCH adopts the modulation and coding strategy with an index of 2 for data transmission.

Based on the above method, an embodiment of the present invention further provides a device for implementing the above method.

Referring to FIG. 5, an embodiment of the present invention provides a terminal 50, including:

a transceiver 52, configured to receive downlink control information sent by the network;

The processor 51 is configured to initiate random access according to the 2-step random access process when the random access process triggered by the downlink control information is a 2-step random access process.

Optionally, the frequency domain resource allocation fields of the downlink control information are all 1s.

Optionally, the downlink control information indicates that the triggered random access procedure is a 2-step or 4-step random access through at least one preset bit. The processor is further configured to, according to at least one preset bit in the downlink control information, determine that the random access procedure triggered by the downlink control information is a 2-step random access procedure or a 4-step random access procedure.

Here, when the access procedure triggered by the downlink control information is 2-step random access, the downlink control information further includes at least one of the following parameters:

pilot index;

Subcarrier spacing or system parameter (numerology) indication information;

Waveform indication information;

modulation coding strategy;

Frequency hopping indication information used to indicate whether the PUSCH is frequency hopping;

Demodulation reference signal port, etc.

Optionally, the processor 51 is further configured to perform pilot and/or PUSCH transmission according to the parameter in the process of initiating the 2-step random access.

Referring to FIG. 6 , another structure of a terminal provided by an embodiment of the present invention, the terminal 600 includes: a processor 601, a transceiver 602, a memory 603, a user interface 604, and a bus interface, wherein:

In this embodiment of the present invention, the terminal 600 further includes: a program stored in the memory 603 and can be run on the processor 601. When the program is executed by the processor 601, the following steps are implemented: receiving downlink control information sent by the network; When the random access procedure triggered by the downlink control information is a 2-step random access procedure, random access is initiated according to the 2-step random access procedure.

In FIG. 6, the bus architecture may include any number of interconnected buses and bridges, in particular one or more processors represented by processor 601 and various circuits of memory represented by memory 603 linked together. The bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described further herein. The bus interface provides the interface. Transceiver 602 may be a number of elements, including a transmitter and a receiver, that provide a means for communicating with various other devices over a transmission medium. For different user equipments, the user interface 604 may also be an interface capable of externally connecting the required equipment, and the connected equipment includes but is not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

The processor 601 is responsible for managing the bus architecture and general processing, and the memory 603 may store data used by the processor 601 in performing operations.

Optionally, the frequency domain resource allocation fields of the downlink control information are all 1s.

Optionally, when the above program is executed by the processor 603, the following steps may also be implemented: according to at least one preset bit in the downlink control information, it is determined that the random access process triggered by the downlink control information is a 2-step random access process. access procedure or 4-step random access procedure.

Optionally, the indication information is indicated by one of the last 10 bits of the downlink control information.

Optionally, when the access procedure indicated by the downlink control information is 2-step random access, the downlink control information further includes at least one of the following parameters:

pilot index;

Subcarrier spacing or system parameter (numerology) indication information;

Waveform indication information;

modulation coding strategy;

Frequency hopping indication information used to indicate whether the PUSCH is frequency hopping;

Demodulation reference signal port, etc.

Optionally, when the above program is executed by the processor 603, the following steps may also be implemented: in the process of initiating the 2-step random access, transmit the pilot and/or PUSCH according to the parameter.

Based on the above terminal, the embodiment of the present invention may initiate a 2-step random access or a 4-step random access procedure in response to a trigger from a network device.

Referring to FIG. 7, an embodiment of the present invention provides a network device 70, including:

a transceiver 72, configured to send downlink control information to the terminal, where the downlink control information is used to trigger a 2-step random access procedure;

The processor 71 is configured to establish a connection with the terminal in response to the 2-step random access procedure initiated by the terminal according to the downlink control information.

Optionally, the processor 71 is further configured to, when initiating a target operation for the terminal, determine a random access procedure that needs to be initiated according to whether the operation delay requirement of the target operation is lower than a preset threshold. It is a 2-step random access procedure or a 4-step random access procedure.

Optionally, the target operation includes at least one of the following operations:

Reacquire the time adjustment amount of the terminal;

adding a secondary cell for the terminal;

The terminal is located.

Optionally, the frequency domain resource allocation fields of the downlink control information are all set to 1.

Optionally, at least one preset bit in the downlink control information is used to indicate that the triggered random access procedure is a 2-step random access procedure or a 4-step random access procedure. For example, it is indicated by one of the last 10 bits of the downlink control information.

Optionally, when the access procedure indicated by the indication information is 2-step random access, the downlink control information further includes at least one of the following parameters:

pilot index;

Subcarrier spacing or system parameter (numerology) indication information;

Waveform indication information;

modulation coding strategy;

Frequency hopping indication information used to indicate whether the PUSCH is frequency hopping;

Demodulation reference signal port, etc.

Referring to FIG. 8, an embodiment of the present invention provides another schematic structural diagram of a network device, including: a processor 801, a transceiver 802, a memory 803, and a bus interface, wherein:

In this embodiment of the present invention, the network device 800 further includes: a program stored in the memory 803 and executable on the processor 801, the program implements the following steps when executed by the processor 801: sending downlink control information to the terminal, so The downlink control information is used to trigger a 2-step random access procedure; in response to the 2-step random access procedure initiated by the terminal according to the downlink control information, a connection with the terminal is established.

In FIG. 8, the bus architecture may include any number of interconnected buses and bridges, in particular one or more processors represented by processor 801 and various circuits of memory represented by memory 803 linked together. The bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described further herein. The bus interface provides the interface. Transceiver 802 may be a number of elements, including a transmitter and a receiver, that provide a means for communicating with various other devices over a transmission medium.

The processor 801 is responsible for managing the bus architecture and general processing, and the memory 803 may store data used by the processor 801 in performing operations.

Optionally, when the program is executed by the processor 803, the following steps may also be implemented: when initiating a target operation for the terminal, according to whether the operation delay requirement of the target operation is lower than a preset threshold, determine the need for The initiated random access procedure is a 2-step random access procedure or a 4-step random access procedure.

Optionally, the target operation includes at least one of the following operations:

Reacquire the time adjustment amount of the terminal;

adding a secondary cell for the terminal;

The terminal is located.

Optionally, the frequency domain resource allocation fields of the downlink control information are all set to 1.

Optionally, at least one preset bit in the downlink control information is used to indicate that the triggered random access procedure is a 2-step random access procedure or a 4-step random access procedure.

Optionally, when the access procedure indicated by the indication information is 2-step random access, the downlink control information further includes at least one of the following parameters:

pilot index;

Subcarrier spacing or system parameter (numerology) indication information;

Waveform indication information;

modulation coding strategy;

Frequency hopping indication information used to indicate whether the PUSCH is frequency hopping;

Demodulation reference signal port, etc.

Based on the above network devices, the embodiment of the present invention can trigger the terminal to initiate a 2-step random access or a 4-step random access process.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solutions in the embodiments of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method for triggering random access described in various embodiments of the present invention. The aforementioned storage medium includes: a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk and other mediums that can store program codes.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (25)

1. A method for triggering random access, applied to a terminal, characterized in that, comprising: Receive downlink control information sent by the network; When the random access procedure triggered by the downlink control information is a 2-step random access procedure, random access is initiated according to the 2-step random access procedure. 2 . The method according to claim 1 , wherein the frequency domain resource allocation fields of the downlink control information are all 1s. 3 . 3. The method according to claim 1, wherein after receiving the downlink control information, the method further comprises: According to at least one preset bit in the downlink control information, it is determined that the random access procedure triggered by the downlink control information is a 2-step random access procedure or a 4-step random access procedure. 4. The method according to any one of claims 1 to 3, wherein when the random access procedure triggered by the downlink control information indication is a 2-step random access procedure, the downlink control information further includes Include at least one of the following parameters: pilot index; Subcarrier spacing or system parameter number indication information; Waveform indication information; modulation coding strategy; Frequency hopping indication information for indicating whether the physical uplink shared channel PUSCH is frequency hopping; Demodulation reference signal port. 5. The method of claim 4, further comprising: In the process of initiating random access according to the 2-step random access procedure, the transmission of pilot and/or PUSCH is performed according to the parameters. 6. A method for triggering random access, applied to network equipment, characterized in that, comprising: Send downlink control information to the terminal, where the downlink control information is used to trigger a 2-step random access procedure; In response to the 2-step random access procedure initiated by the terminal according to the downlink control information, a connection with the terminal is established. 7. The method according to claim 6, wherein before sending the downlink control information, the method further comprises: When the network device initiates the target operation for the terminal, it is determined that the random access process to be initiated is a 2-step random access process or a 4-step random access process according to whether the operation delay requirement of the target operation is lower than a preset threshold. Step random access procedure. 8. The method of claim 7, wherein the target operation comprises at least one of the following operations: Reacquire the time adjustment amount of the terminal; adding a secondary cell for the terminal; The terminal is located. 9. The method of claim 6, wherein The frequency domain resource allocation fields of the downlink control information are all set to 1. 10. The method of claim 9, wherein At least one preset bit in the downlink control information is used to indicate that the triggered random access procedure is a 2-step random access procedure or a 4-step random access procedure. The method according to any one of claims 6 to 10, wherein when the random access procedure triggered by the downlink control information is a 2-step random access, the downlink control information further includes the following parameters At least one of: pilot index; Subcarrier spacing or system parameter number indication information; Waveform indication information; modulation coding strategy; Frequency hopping indication information used to indicate whether the PUSCH is frequency hopping; Demodulation reference signal port. 12. A terminal, characterized in that, comprising: a transceiver for receiving downlink control information sent by the network; The processor is configured to initiate random access according to the 2-step random access process when the random access process triggered by the downlink control information is a 2-step random access process. 13 . The terminal according to claim 12 , wherein the frequency domain resource allocation fields of the downlink control information are all 1s. 14 . 14. The terminal of claim 12, wherein, The processor is further configured to determine, according to at least one preset bit in the downlink control information, that the random access procedure triggered by the downlink control information is a 2-step random access procedure or a 4-step random access procedure. 15. The terminal according to any one of claims 12 to 14, wherein, When the random access procedure triggered by the downlink control information is a 2-step random access procedure, the downlink control information further includes at least one of the following parameters: pilot index; Subcarrier spacing or system parameter number indication information; Waveform indication information; modulation coding strategy; Frequency hopping indication information for indicating whether the physical uplink shared channel PUSCH is frequency hopping; Demodulation reference signal port. 16. The terminal of claim 15, further comprising: The processor is further configured to perform pilot and/or PUSCH transmission according to the parameter in the process of initiating random access according to the 2-step random access procedure. 17. A terminal, characterized in that it comprises: a memory, a processor and a program stored in the memory and running on the processor, and when the program is executed by the processor, any one of claims 1 to 5 is implemented. One of the steps of the method for triggering random access. 18. A network device, comprising: a transceiver, configured to send downlink control information to the terminal, where the downlink control information is used to trigger a 2-step random access procedure; The processor is configured to establish a connection with the terminal in response to the 2-step random access procedure initiated by the terminal according to the downlink control information. 19. The network device of claim 18, wherein, The processor is further configured to, when initiating a target operation for the terminal, determine that the random access procedure to be initiated is a 2-step random access according to whether the operation delay requirement of the target operation is lower than a preset threshold. access procedure or 4-step random access procedure. 20. The network device of claim 19, wherein The target operation includes at least one of the following operations: Reacquire the time adjustment amount of the terminal; adding a secondary cell for the terminal; The terminal is located. 21. The network device of claim 18, wherein The frequency domain resource allocation fields of the downlink control information are all set to 1. 22. The network device of claim 21, wherein At least one preset bit in the downlink control information is used to indicate that the triggered random access procedure is a 2-step random access procedure or a 4-step random access procedure. 23. The network device according to any one of claims 18 to 22, wherein when the random access procedure triggered by the downlink control information is a 2-step random access, the downlink control information further includes the following: At least one of the parameters: pilot index; Subcarrier spacing or system parameter number indication information; Waveform indication information; modulation coding strategy; Frequency hopping indication information used to indicate whether frequency hopping; Demodulation reference signal port. 24. A network device, characterized in that it comprises: a memory, a processor and a program stored in the memory and running on the processor, the program being executed by the processor to achieve the performance as claimed in claims 5 to 11 The steps of any one of the methods for triggering random access. 25. A computer-readable storage medium, wherein a program is stored on the computer-readable storage medium, and when the program is executed by a processor, the triggering according to any one of claims 1 to 11 is realized Steps of a method for random access.

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