CN113056957B

CN113056957B - Method, device, terminal and storage medium for selecting random access type

Info

Publication number: CN113056957B
Application number: CN201980075799.1A
Authority: CN
Inventors: 石聪
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2022-06-03
Anticipated expiration: 2039-04-30
Also published as: CN113056957A; WO2020220320A1

Abstract

The application provides a method, a device, a terminal and a storage medium for selecting a random access type, belonging to the field of mobile communication, wherein the method comprises the following steps: determining an activated first upstream BWP; selecting a random access type according to a predefined first criterion when a four-step random access resource and a two-step random access resource are simultaneously configured on the activated first uplink BWP. According to the method and the device, the terminal can select the reasonable random access type by considering the distribution condition of the random access resources on the BWP, the service requirement and other factors through selecting according to the sequence of the BWP and the random access type or selecting according to the sequence of the random access type and the BWP, so that the problem of how to select the reasonable random access type is solved.

Description

Method, device, terminal and storage medium for selecting random access type

Technical Field

The present application relates to the field of mobile communications, and in particular, to a method, an apparatus, a terminal and a storage medium for selecting a random access type.

Background

Two random access types are supported in a 5G New Radio (NR) system: a four-step random access scheme (4-step RACH) and a two-step random access scheme (2-step RACH).

For a terminal supporting both the four-step random access mode and the two-step random access mode, if a four-step random access resource and a two-step random access resource are simultaneously configured on an activated BandWidth Part (BWP), how to select a reasonable random access type from the two random access types is an unsolved technical problem.

Disclosure of Invention

Embodiments of the present application provide a method, an apparatus, a terminal, and a storage medium for selecting a random access type, which may be used to solve a problem of how to select a reasonable random access type in a scenario where four-step random access resources and two-step random access resources are simultaneously configured on an activated BWP. The technical scheme is as follows:

according to an aspect of the present application, there is provided a method for selecting a random access type (RACH type), which is applied to a terminal that supports both a four-step random access scheme and a two-step random access scheme, the method including: determining an activated first upstream BandWidth Part (BWP); selecting a random access type according to a predefined first criterion when a four-step random access resource and a two-step random access resource are simultaneously configured on the activated first uplink BWP.

In one possible design, the selecting the random access type according to a predefined first criterion includes: selecting the four-step random access mode when the Reference Signal Received Power (RSRP) is smaller than a first RSRP threshold; and when the designated RSRP is larger than the first RSRP threshold value, selecting the two-step random access mode.

In one possible design, the selecting the random access type according to a predefined first criterion includes: when a first trigger event exists, selecting the four-step random access mode; and when a second trigger event exists, selecting the two-step random access mode. In one possible design, the first trigger event has a lower priority than the second trigger event. In one possible design, the first trigger event includes: an initial access event; the second trigger event comprises: at least one of a beam failure recovery event and a handover event.

In one possible design, the selecting the random access type according to a predefined first criterion includes: and when the designated logical channel triggers random access, selecting the two-step random access mode, wherein the designated logical channel is a logical channel with the priority higher than the preset condition.

In one possible design, the selecting the random access type according to a predefined first criterion includes: generating a first random number; when the first random number is smaller than a random number threshold value, selecting the four-step random access mode; when the first random number is larger than the random number threshold value, selecting the two-step random access mode; or, generating a second random number; when the second random number is larger than the random number threshold value, selecting the four-step random access mode; and when the second random number is smaller than the random number threshold value, selecting the two-step random access mode.

In one possible design, the method further includes: and switching the activated upstream BWP from the first upstream BWP to an initial upstream BWP when no random access resource exists on the first upstream BWP, wherein the four-step random access resource and the two-step random access resource exist on the initial upstream BWP at the same time.

In one possible design, Supplemental Up Link (SUL) or Normal Up Link (NUL) is selected according to a predefined second criterion.

According to another aspect of the present disclosure, there is provided a method for selecting a random access type, which is applied to a terminal that supports both a four-step random access scheme and a two-step random access scheme, the method including: selecting a random access type according to a predefined first criterion; and determining the activated uplink BWP according to the random access type.

In one possible design, the selecting the random access type according to a predefined first criterion includes: when the designated RSRP is smaller than a first RSRP threshold value, selecting the four-step random access mode; and when the designated RSRP is larger than the first RSRP threshold value, selecting the two-step random access mode.

In one possible design, the selecting the random access type according to a predefined first criterion includes: when a first trigger event exists, selecting the four-step random access mode; and when a second trigger event exists, selecting the two-step random access mode.

In one possible design, the selecting the random access type according to a predefined first criterion includes: and when a logic channel with the priority higher than the preset condition triggers random access, selecting the two-step random access mode.

In one possible design, the determining activated uplink BWP according to the random access type includes: and when the activated uplink BWP is configured with the random access resource corresponding to the random access type, executing a random access process by using the random access resource.

In one possible design, the determining activated uplink BWP according to the random access type includes: and when the activated uplink BWP is not configured with any random access resource, switching to the initial uplink BWP, and executing a random access process by using the random access resource corresponding to the random access type on the initial uplink BWP.

In one possible design, the determining activated uplink BWP according to the random access type includes: and when the activated uplink BWP is not configured with the random access resource corresponding to the random access type, executing a random access process by using the random access resource which is not corresponding to the random access type on the activated uplink BWP.

In one possible design, the selecting BWP based on the random access type includes: when the activated uplink BWP is not configured with the random access resource corresponding to the random access type, switching to an initial uplink BWP, and executing a random access process by using the random access resource corresponding to the random access type on the initial uplink BWP; or, when the activated uplink BWP is not configured with the random access resource corresponding to the random access type, switching to a target uplink BWP, and performing a random access procedure using the random access resource corresponding to the random access type on the target uplink BWP, where the target uplink BWP is configured with the random access resource corresponding to the random access type.

In one possible design, the method further includes: and selecting SUL or NUL according to the random access type.

In one possible design, the selecting the SUL or the NUL according to the random access type includes: when the random access type is the two-step random access mode, acquiring the random access resources configured on the SUL and the NUL;

selecting the SUL or the NUL according to a predefined second criterion when two-step random access resources are configured on both the SUL and the NUL.

In one possible design, the selecting the SUL or the NUL according to the random access type includes:

when the random access type is the two-step random access mode, acquiring the random access resources configured on the SUL and the NUL;

selecting the SUL or the NUL according to a predefined second criterion when there is only the SUL configured with two-step random access resources; using the SUL when the selected carrier is the SUL; when the selected carrier is the NUL, switching the activated BWP to an initial BWP on which the four-step random access resources and the two-step random access resources exist simultaneously;

selecting the SUL or the NUL according to a predefined second criterion when there is only the NUL configured with the two-step random access resources; using the NUL when the selected carrier is the NUL; when the selected carrier is the SUL, switching the activated BWP to the initial BWP on which the four-step random access resources and the two-step random access resources exist simultaneously.

In one possible design, the selecting SUL or NUL according to the random access type includes:

selecting the SUL or the NUL according to a predefined second criterion when the random access type is the four-step random access mode.

In one possible design, the SUL is selected when the specified RSRP is less than a second RSRP threshold; selecting the NUL when the specified RSRP is greater than the second RSRP threshold.

According to another aspect of the present disclosure, there is provided an apparatus for selecting a random access type, the apparatus supporting both a four-step random access scheme and a two-step random access scheme, the apparatus comprising: a processing module for determining an activated first upstream bandwidth part BWP; the processing module is further configured to select a random access type according to a predefined first criterion when the activated first uplink BWP is configured with the four-step random access resource and the two-step random access resource at the same time.

In one possible design, the processing module is further configured to select the four-step random access mode when the specified RSRP is less than the RSRP threshold; and when the designated RSRP is larger than the RSRP threshold value, selecting the two-step random access mode.

In one possible design, the processing module is further configured to select the four-step random access mode when a first trigger event exists; and when a second trigger event exists, selecting the two-step random access mode.

In one possible design, the first trigger event has a lower priority than the second trigger event.

In one possible design, the first trigger event includes: an initial access event; the second trigger event comprises: at least one of a beam failure recovery event and a handover event.

In a possible design, the processing module is further configured to select the two-step random access mode when there is a logical channel with a priority higher than a preset condition to trigger random access.

In one possible design, the processing module is further configured to generate a first random number; when the first random number is smaller than a random number threshold value, selecting the four-step random access mode; when the first random number is larger than the random number threshold value, selecting the two-step random access mode; or, the processing module is further configured to generate a second random number; when the second random number is larger than the random number threshold value, selecting the four-step random access mode; and when the second random number is smaller than the random number threshold value, selecting the two-step random access mode.

In one possible design, the processing module is further configured to switch the activated upstream BWP from the first upstream BWP to an initial upstream BWP when no random access resource exists on the first upstream BWP, where the four-step random access resource and the two-step random access resource exist simultaneously on the initial upstream BWP.

In one possible design, the processing module is further configured to select the SUL or the NUL according to a predefined second criterion.

In one possible design, the processing module is to select the SUL when the specified RSRP is less than a second RSRP threshold; selecting the NUL when the specified RSRP is greater than the second RSRP threshold.

According to another aspect of the present disclosure, there is provided an apparatus for selecting a random access type, the apparatus supporting both a four-step random access scheme and a two-step random access scheme, the apparatus comprising: a processing module for selecting a random access type according to a predefined first criterion; the processing module is further configured to determine an activated bandwidth part BWP according to the random access type.

In one possible design, the processing module is configured to select the four-step random access mode when a specified RSRP is smaller than a first RSRP threshold; and when the designated RSRP is larger than the first RSRP threshold value, selecting the two-step random access mode.

In one possible design, the processing module is configured to select the four-step random access manner when a first trigger event exists; and when a second trigger event exists, selecting the two-step random access mode. The first trigger event has a lower priority than the second trigger event. The first trigger event comprises: an initial access event; the second trigger event comprises: at least one of a beam failure recovery event and a handover event.

In a possible design, the processing module is configured to select the two-step random access mode when there is a logical channel with a priority higher than a preset condition to trigger random access.

In one possible design, the processing module is configured to generate a first random number; when the first random number is smaller than a random number threshold value, selecting the four-step random access mode; when the first random number is larger than the random number threshold value, selecting the two-step random access mode; or, the processing module is configured to generate a second random number; when the second random number is larger than the random number threshold value, selecting the four-step random access mode; and when the second random number is smaller than the random number threshold value, selecting the two-step random access mode.

In one possible design, the processing module is configured to perform a random access procedure using a random access resource corresponding to the random access type when the activated uplink BWP is configured with the random access resource.

In one possible design, the processing module is configured to switch to an initial uplink BWP when no random access resource is configured on the activated uplink BWP, and perform a random access procedure using a random access resource corresponding to the random access type on the initial uplink BWP.

In one possible design, the processing module is configured to perform a random access procedure using a random access resource on the activated uplink BWP that does not correspond to the random access type when the random access resource on the activated uplink BWP that does not correspond to the random access type is not configured.

In one possible design, the processing module is configured to switch to an initial uplink BWP when a random access resource corresponding to the random access type is not configured on the activated uplink BWP, and perform a random access procedure using the random access resource corresponding to the random access type on the initial uplink BWP; or, the processing module is configured to switch to a target uplink BWP when a random access resource corresponding to the random access type is not configured on the activated uplink BWP, and perform a random access procedure using the random access resource corresponding to the random access type on the target uplink BWP, where the target uplink BWP is a BWP configured with the random access resource corresponding to the random access type.

In one possible design, the processing module is configured to select a SUL or a NUL according to the random access type;

in a possible design, the processing module is configured to, when the random access type is the two-step random access mode, acquire random access resources configured on the SUL and the NUL; selecting the SUL or the NUL according to a predefined second criterion when two-step random access resources are configured on both the SUL and the NUL.

In a possible design, the processing module is configured to, when the random access type is the two-step random access mode, acquire random access resources configured on the SUL and the NUL;

the processing module to select the SUL or the NUL according to a predefined second criterion when there is only two-step random access resources configured with the SUL; using the SUL when the selected carrier is the SUL; when the selected carrier is the NUL, switching the activated BWP to an initial BWP on which the four-step random access resources and the two-step random access resources exist simultaneously;

the processing module to select the SUL or the NUL according to a predefined second criterion when there is only the NUL configured with the two-step random access resources; using the NUL when the selected carrier is the NUL; when the selected carrier is the SUL, switching the activated BWP to the initial BWP on which the four-step random access resources and the two-step random access resources exist simultaneously.

In one possible design, the processing module is configured to select the SUL or the NUL according to a predefined second criterion when the random access type is the four-step random access mode.

According to another aspect of the present application, there is provided a terminal, including:

a processor;

a memory for storing executable instructions of the processor;

wherein the processor is configured to load and execute the executable instructions to implement the method of random access type selection as described above.

According to another aspect of the present application, there is provided a computer readable storage medium having stored therein at least one instruction, at least one program, set of codes or set of instructions, which is loaded and executed by the processor to implement the method of selecting a random access type as described above.

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:

by selecting according to the order of the BWP and the random access type, or selecting according to the order of the random access type and the BWP, the terminal can select the reasonable random access type by considering the distribution condition of the random access resource on the BWP, the service requirement and other factors, thereby solving the problem of how to select the reasonable random access type.

Drawings

Fig. 1 is a flowchart of a four-step random access procedure provided in the related art;

fig. 2 is a flowchart of a two-step random access procedure provided in the related art;

FIG. 3 is a block diagram of a communication system provided in an exemplary embodiment of the present application;

fig. 4 is a flowchart of a method for selecting a random access type according to an exemplary embodiment of the present application;

fig. 5 is a flowchart of a method for selecting a random access type according to another exemplary embodiment of the present application;

fig. 6 is a flowchart of a method for selecting a random access type according to another exemplary embodiment of the present application;

fig. 7 is a flowchart of a method for selecting a random access type according to another exemplary embodiment of the present application;

fig. 8 is a flowchart of a method for selecting a random access type provided by another exemplary embodiment of the present application;

fig. 9 is a flowchart of a method for selecting a random access type according to another exemplary embodiment of the present application;

fig. 10 is a flowchart of a method for selecting a random access type provided by another exemplary embodiment of the present application;

fig. 11 is a flowchart of a method for selecting a random access type according to another exemplary embodiment of the present application;

fig. 12 is a flowchart of a method for selecting a random access type according to another exemplary embodiment of the present application;

fig. 13 is a schematic structural diagram of a random access type selection apparatus according to another exemplary embodiment of the present application;

fig. 14 is a schematic structural diagram of a random access type selection apparatus according to another exemplary embodiment of the present application;

fig. 15 is a schematic structural diagram of a terminal according to another exemplary embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The random access procedure refers to a process from a user sending a random access preamble sequence to trying to access a network to establishing a basic signaling connection with the network, and is one of the most basic requirements for any cellular communication system, and is used for enabling a terminal to establish data communication with a network side.

The contention-based random access procedure is divided into: a contention-based four-step random access procedure and a contention-based two-step random access procedure, and fig. 1 shows the contention-based four-step random access procedure, which includes the following steps:

(1) the terminal sends message 1 to the access network equipment: a random access preamble sequence (preamble).

The terminal sends a random access preamble sequence (preamble) to the access network equipment, and the access network equipment estimates the transmission delay of the terminal according to the preamble sequence to realize uplink synchronization.

(2) The access network equipment sends a message 2 to the terminal: random Access Response (RAR).

The access network device sends a time advance (timing advance) command based on the transmission delay estimated in the first step to adjust the sending time of the terminal. Message 2 is organized by Media Access Control (MAC) of the Access network device and carried by a downlink shared Channel (DL _ SCH), and one message 2 can simultaneously respond to random Access requests of multiple terminals.

The Access network device adopts a Physical Downlink Control Channel (PDCCH) scheduling message 2, and performs addressing (also called scrambling) through a C-RNTI or an RA-RNTI, which is determined by a Physical Random Access Channel (PRACH) time-frequency resource location of a bearer message 1. And the message 2 comprises an uplink transmission timing advance and allocates uplink resources and the temporary C-RNTI for the message 3.

(3) The terminal sends a message 3 to the access network equipment: the first time the transmission is scheduled.

After receiving the message 2, the terminal transmits a message 3 on the allocated uplink resource, and sends a User Equipment identity (UE ID) to the access network Equipment through an uplink shared Channel (Up Link Share Channel, UL _ SCH).

Optionally, the message 3 includes a Common Control Channel (CCCH) Service Data Unit (SDU) for the message 4 to carry the contention resolution ID.

(4) The access network equipment sends a message 4 to the terminal: a contention resolution message.

The access network equipment sends a contention resolution message to the terminal on a downlink shared Channel (DL _ SCH).

In the contention based random access procedure, the four-step random access procedure may be combined into a two-step random access procedure, and with reference to fig. 2, the contention based two-step random access procedure includes a message a and a message B, and the related steps include:

(1) the terminal sends message a to the access network device.

(2) And after receiving the message A sent by the terminal, the access network equipment sends a message B to the terminal.

Optionally, the message a includes the contents of message 1 and message 3, that is, the message a includes: a random access preamble sequence and a UE ID, which may be: one of C-RNTI, temporary C-RNTI and RA-RNTI;

optionally, the message B includes the contents of the message 2 and the message 4, that is, the message B includes: random access response and contention resolution information.

The communication system and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present disclosure, and do not constitute a limitation to the technical solution provided by the embodiment of the present disclosure, and as a person having ordinary skill in the art knows that along with the evolution of the communication system and the appearance of a new service scenario, the technical solution provided by the embodiment of the present disclosure is also applicable to similar technical problems.

Fig. 3 shows a block diagram of a communication system provided by an exemplary embodiment of the present disclosure, which may include: access network 12 and terminal 13.

Several access network devices 120 are included in access network 12. The access network equipment 120 may be a base station, which is a device deployed in an access network to provide wireless communication functions for terminals. The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems using different radio access technologies, the names of devices with base station functionality may differ, for example in LTE systems, called eNodeB or eNB; in the 5G NR system, it is called a gbnodeb or a gNB. The name "base station" may describe, and may vary as communication technology evolves. For convenience, in the embodiments of the present disclosure, the above-mentioned device for providing a wireless communication function for a terminal is collectively referred to as an access network device.

The terminal 13 may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem with wireless communication functions, as well as various forms of User Equipment (UE), Mobile Station (MS), terminal (terminal device), and so on. For convenience of description, the above-mentioned devices are collectively referred to as a terminal. The access network device 120 and the terminal 13 communicate with each other through some air interface technology, for example, a Uu interface.

The uplink carrier configured by the access network device 120 to the terminal 13 may be SUL or NUL, and the BWP activated on different carriers is configured with different random access resources. The problem that how to select a reasonable random access type by considering the difference of different uplink carriers and the difference of the configuration of random access resources on different uplink BWPs is still to be solved. The random access types in the present application include: a four-step random access process based on competition and a two-step random access process based on competition.

The embodiment of the application provides two selection modes:

the first method is as follows: the UE selects according to a first order of SUL/NUL, BWP and random access type;

the second method comprises the following steps: the UE selects in a second order of random access type, SUL/NUL, and BWP.

The first mode will be explained using the embodiments of fig. 4, 5 and 6.

Fig. 4 is a flowchart of a method for selecting a random access type according to an exemplary embodiment of the present application. The method may be exemplified by being performed by a terminal as shown in fig. 3. The terminal is a terminal which simultaneously supports a four-step random access mode and a two-step random access mode. The method comprises the following steps:

step 402, determining an activated first upstream BWP;

step 404, when the four-step random access resource and the two-step random access resource are configured on the activated first uplink BWP, selecting a random access type according to a predefined first criterion.

In summary, the method provided in this embodiment sequentially selects the random access types according to the sequence of determining the BWP and then selecting the random access type, so that the terminal can select a reasonable random access type according to the allocation of the random access resource on the BWP and the service requirement, thereby solving the problem of how to select a reasonable random access type.

In an alternative embodiment based on fig. 4, the first criterion comprises at least one of the following criteria:

criterion 1: when the designated RSRP is smaller than a first RSRP threshold value, selecting a four-step random access mode; and when the designated RSRP is larger than the first RSRP threshold value, selecting a two-step random access mode.

As one example, the specified RSRP may be an RSRP used to characterize downlink path loss. The first RSRP threshold may be RSRP-threshold ssb-SUL as defined in the communication standard. Or may be an rsrp-Threshold-RachType pre-configured by the network that is different from the rsrp-Threshold SSB-SUL, and the rsrp-Threshold-RachType may be larger or smaller than the rsrp-Threshold SSB-SUL.

Criterion 2: selecting a four-step random access mode when a first trigger event exists; and when a second trigger event exists, selecting a two-step random access mode.

The second trigger event has a higher priority than the first trigger event. As one example, the first triggering event includes: an initial access event; the second trigger event includes: beam Failure Recovery (BFR), Handover (HO) event, or other higher priority event.

Criterion 3: when the random access triggered by the appointed logic channel exists, selecting a two-step random access mode; and when the random access triggered by the appointed logical channel does not exist, selecting a four-step random access mode. Wherein the designated logical channel is a logical channel having a priority higher than a preset condition.

As one example, certain logical channels may be pre-configured with a higher priority. When the logic channels with the priority higher than the preset condition trigger random access (such as a scene that SR transmission is triggered but the SR transmission is not successful), selecting a two-step random access mode; when a logical channel with the priority not higher than the preset condition triggers random access (for example, a random access process is triggered by a CCCH SDU), a four-step random access mode is selected.

Extension of criterion 3: a parameter is configured in the logical channel, and the parameter indicates whether the logical channel can adopt 2-step RACH or 4-step RACH. For example, since a logical channel has new data to trigger SR, the SR is not successfully transmitted, resulting in RACH triggering. Or because a certain logic channel has new data to be sent, but the uplink is out of step at the moment; it may be determined whether the parameter is configured in the logical channel, and if the parameter indicates that 2-step RACH is used, the UE uses 2-step RACH.

Criterion 4: generating a first random number; when the first random number is smaller than the random number threshold value, selecting a four-step random access mode; when the first random number is larger than the random number threshold value, selecting a two-step random access mode;

the access network device is pre-configured with a random number threshold to the terminal, which may be a value between (0, 1). When a terminal needs to execute a random access process, generating a first random number between (0, 1), and selecting a four-step random access mode when the first random number is smaller than a random number threshold; and when the first random number is larger than the random number threshold value, selecting a two-step random access mode.

Criterion 5: generating a second random number; when the second random number is larger than the random number threshold value, selecting a four-step random access mode; and when the second random number is smaller than the random number threshold value, selecting a two-step random access mode.

The access network device is pre-configured with a random number threshold to the terminal, which may be a value between (0, 1). When the terminal needs to execute a random access process, generating a second random number between (0, 1), and selecting a four-step random access mode when the second random number is smaller than a random number threshold; and when the second random number is larger than the random number threshold value, selecting a two-step random access mode.

The above criteria may be used in combination, with criterion 1 being the base criterion, with any of criteria 2 through 5 being superimposed to form a new criterion. Illustratively, criteria 1 and 2 may be used in combination, criteria 1 and 3 may be used in combination, criteria 1 and 4 may be used in combination, and criteria 1 and 5 may be used in combination.

Taking the combination of the criterion 1 and the criterion 2 as an example, when the specified RSRP is larger than the RSRP threshold and a second trigger event exists, selecting a two-step random access mode; and when the designated RSRP is smaller than the RSRP threshold or a first trigger event exists, selecting a four-step random access mode.

Taking the combination of the criterion 1 and the criterion 3 as an example, when the designated RSRP is greater than the RSRP threshold and the designated logic channel triggers random access, a two-step random access mode is selected; and when the designated RSRP is smaller than the RSRP threshold value or the designated logic channel does not exist to trigger random access, selecting a four-step random access mode.

Fig. 5 is a flowchart illustrating a method for selecting a random access type according to another exemplary embodiment of the present application. The method may be illustrated as being performed by the terminal shown in fig. 3. The terminal is a terminal which simultaneously supports a four-step random access mode and a two-step random access mode. The method comprises the following steps:

step 402, determining an activated first upstream BWP;

illustratively, the terminal determines the activated first uplink BWP according to the configuration of the access network device. "active" means currently activated and in an activated state.

Step 403, determining whether a random access resource is configured on the first uplink BWP, where the random access resource includes at least one of two-step random access resources and four-step random access resources;

for the resource relationship between the four-step random access resource and the two-step random access resource, the access network device may adopt at least one of the following two configurations.

Attribute 1: configuring different random access occasions (RACH Occasion, RO) for the four-step random access resources and the two-step random access resources;

attribute 2: the shared RO and different preambles are configured for the four-step random access resource and the two-step random access resource.

Step 404, when the activated first uplink BWP is configured with the four-step random access resource and the two-step random access resource at the same time, selecting a random access type according to a predefined first criterion;

step 405, when only four-step random access resources are configured on the activated first uplink BWP, executing a four-step random access procedure on the first uplink BWP;

in some embodiments (such as a scenario where the serving cell is a SpCell), the terminal also switches the activated downlink BWP to the downlink BWP with the same identification as on the first uplink BWP. The SpCell is a Master Cell Group Primary Cell (MCG PCell) in the Master Cell Group or a Master Secondary Cell Group Primary Secondary Cell (SCG PsCell) in the Secondary Cell Group.

Step 406, when only two-step random access resources are configured on the activated first uplink BWP, performing a two-step random access procedure on the first uplink BWP;

in some embodiments (such as a scenario where the serving cell is a SpCell), the terminal also switches the activated downlink BWP to the downlink BWP with the same identification as on the first uplink BWP.

Step 407, when no random access resource is configured on the activated first upstream BWP, switch to the initial upstream BWP.

After the active upstream BWP is switched to the initial upstream BWP, a random access type is selected on the initial upstream BWP according to a predefined first criterion. The first criterion can refer to the description of the above embodiments, and is not repeated.

In summary, in the method provided in this embodiment, when only four-step random access resources or two-step random access resources are configured on the activated first uplink BWP, the random access procedure of the corresponding type is directly executed, so as to avoid an unreasonable situation that the terminal is forced to select two random access manners under the condition that only one random access resource is configured.

The method provided by this embodiment further ensures that the terminal can perform the random access procedure smoothly by switching to the initial uplink BWP when no random access resource is configured on the activated first uplink BWP.

In the embodiment based on fig. 4 or fig. 5, the step 402 further includes a step 401, as shown in fig. 6:

step 401, selecting SUL or NUL according to a predefined second criterion;

SUL is the supplemental uplink used to enhance uplink coverage and NUL is the normal uplink.

As an example of this embodiment, the predefined second criterion is a RSRP-based selection criterion. Optionally, the terminal selects the SUL when the specified RSRP is less than the second RSRP threshold; the NUL is selected when the designated RSRP is greater than a second RSRP threshold.

As an example of the present embodiment, the second criterion is as follows:

1. if the RSRP of the downlink path loss is less than the RSRP threshold (RSRP-threshold SSB-SUL), selecting an SUL carrier to execute a random access process, and setting the PCMAX parameter as the PCMAX of the SUL carrier_fc。

2. If the RSRP of the downlink path loss is not less than the RSRP-threshold SSB-SUL, the NUL carrier is selected to execute the random access process, and the PCMAX parameter is set to the PCMAX of the NUL carrier_fc。

The second embodiment will be explained below with reference to the embodiments of fig. 7 to 12.

Fig. 7 is a flowchart of a method for selecting a random access type according to an exemplary embodiment of the present application. The method may be exemplified by being performed by a terminal as shown in fig. 3. The terminal is a terminal which simultaneously supports a four-step random access mode and a two-step random access mode. The method comprises the following steps:

step 702, selecting a random access type according to a predefined first criterion;

for the first criterion, reference may be made to the description of the above embodiments, which are not repeated herein.

Step 704, determining the activated upstream BWP according to the random access type.

As an example of this embodiment, determining the activated upstream BWP according to the random access type includes: it is determined whether the active upstream BWP requires a handover according to the random access type.

In summary, the method provided in this embodiment prioritizes the selection of the random access type over the BWP handover, so that even if the terminal selects the two-step random access scheme, the UE can be ensured to select one BWP to perform the two-step random access scheme.

In an alternative embodiment based on fig. 7, the step 704 may include the following sub-steps, as shown in fig. 8:

7041, when the activated uplink BWP is configured with a random access resource corresponding to the random access type, performing a random access procedure using the random access resource;

and when the selected random access type is a four-step random access mode and the activated uplink BWP is configured with four-step random access resources, executing a random access process by using the four-step random access resources.

And when the selected random access type is a two-step random access mode and the activated uplink BWP is configured with two-step random access resources, executing a random access process by using the two-step random access resources.

Step 7042, when no random access resource is configured on the activated uplink BWP, switch to the initial uplink BWP, and execute a random access procedure using the random access resource corresponding to the random access type on the initial uplink BWP.

Four-step random access resources and two-step random access resources are simultaneously configured on the initial uplink BWP.

And when the selected random access type is a four-step random access mode, executing a random access process by using the four-step random access resource on the initial uplink BWP.

When the selected random access type is a two-step random access scheme, a random access procedure is performed using two-step random access resources on the initial uplink BWP.

In an alternative embodiment based on fig. 7, the step 704 may include the following sub-steps, as shown in fig. 9:

Step 7043, when no random access resource corresponding to the random access type is configured on the activated uplink BWP, performing a random access procedure using a random access resource on the activated uplink BWP that does not correspond to the random access type.

And when the selected random access type is a four-step random access mode and the activated uplink BWP is not configured with four-step random access resources, executing a two-step random access process by using the two-step random access resources.

And when the selected random access type is a two-step random access mode and the activated uplink BWP is not configured with two-step random access resources, executing a four-step random access process by using the four-step random access resources.

In an alternative embodiment based on fig. 7, the above step 704 may include the following sub-steps, as shown in fig. 10;

Step 7044, when the activated uplink BWP is not configured with the random access resource corresponding to the random access type, switching to the initial uplink BWP, and executing a random access procedure using the random access resource corresponding to the random access type on the initial uplink BWP; or, switching to a target uplink BWP, and performing a random access procedure using a random access resource corresponding to the random access type on the target uplink BWP, where the target uplink BWP is configured with the random access resource corresponding to the random access type.

In some embodiments, the initial upstream BWP is handed over to when no random access resources corresponding to the random access type are configured on the activated upstream BWP. Four-step random access resources and two-step random access resources are simultaneously configured on the initial uplink BWP.

In other embodiments, the target upstream BWP is handed over to when no random access resources corresponding to the random access type are configured on the active upstream BWP. The target uplink BWP is simultaneously configured with four steps of random access resources and two steps of random access resources.

And when the selected random access type is a four-step random access mode, executing a random access process by using four-step random access resources on the target uplink BWP.

And when the selected random access type is a two-step random access mode, performing a random access process by using two-step random access resources on the target uplink BWP.

Fig. 11 is a flowchart of a method for selecting a random access type according to another exemplary embodiment of the present application. The method may be exemplified by being performed by a terminal as shown in fig. 3. The terminal is a terminal which simultaneously supports a four-step random access mode and a two-step random access mode. The method comprises the following steps:

step 703, selecting SUL or NUL according to the random access type;

as an example of the embodiment, SUL or NUL is selected according to the random access type and the configuration of random access resources on SUL/NUL.

In step 704, an active BWP is determined according to the random access type.

In summary, in the method provided in this embodiment, in summary, by prioritizing the selection of the random access type over the SUL or NUL handover, even if the terminal selects the two-step random access scheme, the UE can be ensured to select one SUL/NUL to perform the two-step random access scheme.

Fig. 12 is a flowchart of a method for selecting a random access type according to another exemplary embodiment of the present application. The method may be exemplified by being performed by a terminal as shown in fig. 3. The terminal is a terminal which simultaneously supports a four-step random access mode and a two-step random access mode. The method comprises the following steps:

7031, when the random access type is a two-step random access mode, acquiring random access resources configured on the SUL and the NUL;

7032, when two random access resources are configured on both SUL and NUL, selecting SUL or NUL according to a predefined second criterion;

the second criterion may refer to the related description of the embodiment in fig. 6, and the description of this embodiment is not repeated.

When the selected carrier is the SUL, executing a random access process by using two steps of random access resources on the SUL; and when the selected carrier is NUL, performing a random access process by using two-step random access resources on the NUL.

7033, when there is only SUL configured with two steps of random access resources, selecting SUL or NUL according to a predefined second criterion;

when the selected carrier is SUL, perform step 7034; when the selected carrier is NUL, step 7035 is performed.

Step 7034, when the selected carrier is SUL, use SUL;

the random access procedure is performed using two steps of random access resources on the SUL.

7035, when the selected carrier is NUL, switching the activated BWP to an initial BWP, where four-step random access resources and two-step random access resources exist on the initial BWP;

the random access procedure is performed using two-step random access resources on the initial BWP.

7036, when there is only NUL configured with two steps of random access resources, selecting SUL or NUL according to a predefined second criterion;

when the selected carrier is SUL, perform step 7037; when the selected carrier is NUL, step 7038 is performed.

Step 7037, when the selected carrier is NUL, using NUL;

the random access procedure is performed using two steps of random access resources on the NUL.

7038, when the selected carrier is SUL, switching the activated BWP to the initial BWP, where the initial BWP has four-step random access resources and two-step random access resources;

Step 7039, when the random access type is a four-step random access mode, selecting a SUL or a NUL according to a predefined second criterion.

When the selected carrier is the SUL, executing a random access process by using four-step random access resources on the SUL; and when the selected carrier is NUL, performing a random access process by using four-step random access resources on the NUL.

In step 704, an active BWP is determined according to the random access type.

The implementation process of this step may refer to the related descriptions of step 7041 to step 7044, and is not described again.

The following are embodiments of the apparatus of the present application, and for details of the embodiments of the apparatus not described in detail, reference may be made to the corresponding embodiments of the method described above, which are not limited thereto. Fig. 13 is a block diagram illustrating an apparatus for selecting a random access type according to an exemplary embodiment of the present application. The device simultaneously supports a four-step random access mode and a two-step random access mode, and comprises: a processing module 1320.

A processing module 1320 for determining an activated first upstream bandwidth part BWP;

the processing module 1320 is configured to select a random access type according to a predefined first criterion when a four-step random access resource and a two-step random access resource are configured on the activated first uplink BWP at the same time.

In an optional embodiment, the processing module 1320 is configured to select the four-step random access manner when RSRP is less than a first RSRP threshold; and when the designated RSRP is larger than the first RSRP threshold value, selecting the two-step random access mode.

In an optional embodiment, the processing module 1320 is configured to select the four-step random access mode when a first trigger event exists; and when a second trigger event exists, selecting the two-step random access mode. Optionally, the priority of the first trigger event is lower than the priority of the second trigger event. The first trigger event comprises: an initial access event; the second trigger event comprises: at least one of a beam failure recovery event and a handover event.

In an alternative embodiment, the processing module 1320 is configured to select the two-step random access mode when there is a specific logical channel triggering random access. Wherein the designated logical channel is a logical channel having a priority higher than a preset condition.

In an alternative embodiment, the processing module 1320 is configured to generate a first random number; when the first random number is smaller than a random number threshold value, selecting the four-step random access mode; and when the first random number is larger than the random number threshold value, selecting the two-step random access mode.

In an alternative embodiment, the processing module 1320 is configured to generate a second random number; when the second random number is larger than the random number threshold value, selecting the four-step random access mode; and when the second random number is smaller than the random number threshold value, selecting the two-step random access mode.

In an optional embodiment, the processing module 1320 is configured to switch the activated upstream BWP from the first upstream BWP to an initial upstream BWP when there is no random access resource on the first upstream BWP, where the four-step random access resource and the two-step random access resource exist simultaneously on the initial upstream BWP.

In an alternative embodiment, the processing module 1320 is configured to select the supplemental uplink SUL or the normal uplink NUL according to a predefined second criterion. In an optional embodiment, the processing module 1320 is configured to select the SUL when the specified RSRP is less than a second RSRP threshold; selecting the NUL when the designated RSRP is greater than the second RSRP threshold.

Fig. 14 shows a block diagram of a random access type selection apparatus according to another exemplary embodiment of the present application. The device simultaneously supports a four-step random access mode and a two-step random access mode, and comprises: a processing module 1420.

A processing module 1420, configured to select a random access type according to a predefined first criterion;

the processing module 1420 is further configured to determine an activated bandwidth part BWP according to the random access type.

In an optional embodiment, the processing module 1420 is configured to select the four-step random access mode when the designated RSRP is smaller than a first RSRP threshold; and when the designated RSRP is larger than the first RSRP threshold value, selecting the two-step random access mode.

In an optional embodiment, the processing module 1420 is configured to select the four-step random access manner when a first trigger event exists; and when a second trigger event exists, selecting the two-step random access mode. Optionally, the priority of the first trigger event is lower than the priority of the second trigger event. The first trigger event comprises: an initial access event; the second trigger event comprises: at least one of a beam failure recovery event and a handover event.

In an optional embodiment, the processing module 1420 is configured to select the two-step random access mode when there is a logical channel with a priority higher than a preset condition to trigger random access.

In an alternative embodiment, the processing module 1420 is configured to generate a first random number; when the first random number is smaller than a random number threshold value, selecting the four-step random access mode; and when the first random number is larger than the random number threshold value, selecting the two-step random access mode.

In an alternative embodiment, the processing module 1420 is configured to generate a second random number; when the second random number is larger than the random number threshold value, selecting the four-step random access mode; and when the second random number is smaller than the random number threshold value, selecting the two-step random access mode.

In an optional embodiment, the processing module 1420 is configured to, when a random access resource corresponding to the random access type is configured on the activated uplink BWP, perform a random access procedure using the random access resource.

In an optional embodiment, the processing module 1420 is configured to switch to an initial uplink BWP when no random access resource is configured on the activated uplink BWP, and perform a random access procedure using a random access resource corresponding to the random access type on the initial uplink BWP.

In an optional embodiment, the processing module 1420 is configured to, when no random access resource corresponding to the random access type is configured on the activated uplink BWP, perform a random access procedure using a random access resource on the activated uplink BWP that does not correspond to the random access type.

In an optional embodiment, the processing module 1420 is configured to switch to an initial uplink BWP when no random access resource corresponding to the random access type is configured on the activated uplink BWP, and perform a random access procedure using the random access resource corresponding to the random access type on the initial uplink BWP.

In an optional embodiment, the processing module 1420 is configured to switch to a target uplink BWP when no random access resource corresponding to the random access type is configured on the activated uplink BWP, and perform a random access procedure using the random access resource corresponding to the random access type on the target uplink BWP, where the target uplink BWP is a BWP configured with the random access resource corresponding to the random access type.

In an optional embodiment, the processing module 1420 is configured to select an supplemental uplink SUL or a normal uplink NUL according to the random access type;

in an optional embodiment, the processing module 1420 is configured to, when the random access type is the two-step random access manner, acquire random access resources configured on the SUL and the NUL; selecting the SUL or the NUL according to a predefined second criterion when two-step random access resources are configured on both the SUL and the NUL.

In an optional embodiment, the processing module 1420 is configured to, when the random access type is the two-step random access mode, acquire random access resources configured on the SUL and the NUL;

in an alternative embodiment, the processing module 1420 is configured to select the SUL or the NUL according to a predefined second criterion when there is only two steps of random access resources configured with the SUL; using the SUL when the selected carrier is the SUL; when the selected carrier is the NUL, switching the activated BWP to an initial BWP on which the four-step random access resources and the two-step random access resources exist simultaneously;

in an alternative embodiment, the processing module 1420 is configured to select the SUL or the NUL according to a predefined second criterion when only the NUL is configured with the two-step random access resources; using the NUL when the selected carrier is the NUL; when the selected carrier is the SUL, switching the activated BWP to the initial BWP on which the four-step random access resources and the two-step random access resources exist simultaneously.

In an optional embodiment, the processing module 1420 is configured to select the SUL or the NUL according to a predefined second criterion when the random access type is the four-step random access mode. The processing module 1420, configured to select the SUL when the specified RSRP is less than a second RSRP threshold; selecting the NUL when the specified RSRP is greater than the second RSRP threshold.

Fig. 15 shows a schematic structural diagram of a terminal according to an exemplary embodiment of the present disclosure, where the terminal includes: a processor 101, a receiver 102, a transmitter 103, a memory 104, and a bus 105.

The processor 101 includes one or more processing cores, and the processor 101 executes various functional applications and information processing by running software programs and modules.

The receiver 102 and the transmitter 103 may be implemented as one communication component, which may be a communication chip.

The memory 104 is connected to the processor 101 through a bus 105.

The memory 104 may be configured to store at least one instruction for execution by the processor 101 to implement the various steps in the above-described method embodiments.

Further, the memory 104 may be implemented by any type or combination of volatile or non-volatile storage devices, including, but not limited to: magnetic or optical disks, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), Static Random Access Memory (SRAM), read-only memory (ROM), magnetic memory, flash memory, programmable read-only memory (PROM).

In an exemplary embodiment, a computer readable storage medium is further provided, in which at least one instruction, at least one program, a set of codes, or a set of instructions is stored, which is loaded and executed by the processor to implement the method for selecting a random access type provided by the above-mentioned various method embodiments.

The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for selecting a random access type is applied to a terminal which supports a four-step random access mode and a two-step random access mode simultaneously, and the method comprises the following steps:

determining an activated first upstream bandwidth part BWP;

when the activated first uplink BWP is configured with four-step random access resources and two-step random access resources at the same time, selecting a random access type according to a predefined first criterion;

the method further comprises the following steps:

and switching the activated upstream BWP from the first upstream BWP to an initial upstream BWP when no random access resource exists on the first upstream BWP, wherein the four-step random access resource and the two-step random access resource exist on the initial upstream BWP at the same time.

2. The method according to claim 1, wherein said selecting a random access type according to a predefined first criterion comprises: when the designated Reference Signal Received Power (RSRP) is smaller than a first RSRP threshold value, selecting the four-step random access mode; and when the designated RSRP is larger than the first RSRP threshold value, selecting the two-step random access mode.

3. The method according to claim 1, wherein said selecting a random access type according to a predefined first criterion comprises: when a first trigger event exists, selecting the four-step random access mode; and when a second trigger event exists, selecting the two-step random access mode.

4. The method of claim 3, wherein the first trigger event has a lower priority than the second trigger event.

5. The method of claim 3, wherein the first trigger event comprises: an initial access event; the second trigger event comprises: at least one of a beam failure recovery event and a handover event.

6. The method according to claim 1, wherein said selecting a random access type according to a predefined first criterion comprises: when the random access triggered by the appointed logic channel exists, selecting the two-step random access mode;

wherein the designated logical channel is a logical channel having a priority higher than a preset condition.

7. The method according to claim 1, wherein said selecting a random access type according to a predefined first criterion comprises: generating a first random number; when the first random number is smaller than a random number threshold value, selecting the four-step random access mode; when the first random number is larger than the random number threshold value, selecting the two-step random access mode; or, generating a second random number; when the second random number is larger than the random number threshold value, selecting the four-step random access mode; and when the second random number is smaller than the random number threshold value, selecting the two-step random access mode.

8. The method according to any of claims 1 to 7, wherein prior to determining the activated first upstream BWP, further comprising:

the supplemental uplink SUL or the normal uplink NUL is selected according to a predefined second criterion.

9. The method according to claim 8, wherein said selecting supplemental uplink SUL or normal uplink NUL according to a predefined second criterion comprises: selecting the SUL when the designated RSRP is less than a second RSRP threshold; selecting the NUL when the specified RSRP is greater than the second RSRP threshold.

10. A method for selecting a random access type is applied to a terminal which supports a four-step random access mode and a two-step random access mode simultaneously, and the method comprises the following steps: selecting a random access type according to a predefined first criterion; determining an activated bandwidth part BWP according to the random access type;

the determining of the activated BWP according to the random access type includes:

and when the activated uplink BWP is not configured with any random access resource, switching to the initial uplink BWP, and executing a random access process by using the random access resource corresponding to the random access type on the initial uplink BWP.

11. The method according to claim 10, wherein said selecting a random access type according to a predefined first criterion comprises: when the designated Reference Signal Received Power (RSRP) is smaller than the RSRP threshold value, selecting the four-step random access mode; and when the designated RSRP is larger than the RSRP threshold value, selecting the two-step random access mode.

12. The method according to claim 10, wherein said selecting a random access type according to a predefined first criterion comprises: when a first trigger event exists, selecting the four-step random access mode; and when a second trigger event exists, selecting the two-step random access mode.

13. The method of claim 12, wherein the first trigger event has a lower priority than the second trigger event.

14. The method of claim 12, wherein the first trigger event comprises: an initial access event; the second trigger event comprises: at least one of a beam failure recovery event and a handover event.

15. The method according to claim 10, wherein said selecting a random access type according to a predefined first criterion comprises: when the random access triggered by the appointed logic channel exists, selecting the two-step random access mode; wherein the designated logical channel is a logical channel having a priority higher than a preset condition.

16. The method according to claim 10, wherein said selecting a random access type according to a predefined first criterion comprises: generating a first random number; when the first random number is smaller than a random number threshold value, selecting the four-step random access mode; when the first random number is larger than the random number threshold value, selecting the two-step random access mode; or, generating a second random number; when the second random number is larger than the random number threshold value, selecting the four-step random access mode; and when the second random number is smaller than the random number threshold value, selecting the two-step random access mode.

17. The method according to any of claims 10 to 16, wherein said determining an active upstream BWP according to said random access type further comprises: and when the activated uplink BWP is configured with random access resources corresponding to the random access type, executing a random access process by using the random access resources.

18. The method according to any of claims 10 to 16, wherein said determining an active BWP according to said random access type further comprises: when the activated uplink BWP is not configured with the random access resource corresponding to the random access type, switching to an initial uplink BWP, and executing a random access process by using the random access resource corresponding to the random access type on the initial uplink BWP; or, when the activated uplink BWP is not configured with the random access resource corresponding to the random access type, switching to a target uplink BWP, and performing a random access procedure using the random access resource corresponding to the random access type on the target uplink BWP, where the target uplink BWP is configured with the random access resource corresponding to the random access type.

19. The method according to any of the claims 10 to 16, wherein after selecting the random access type according to a predefined first criterion, further comprising: selecting a supplemental uplink SUL or a normal uplink NUL according to the random access type.

20. The method of claim 19, wherein selecting a SUL or NUL according to the random access type comprises:

21. The method of claim 19, wherein the selecting a SUL or NUL according to the random access type comprises:

selecting the SUL or the NUL according to a predefined second criterion when there is only two steps of random access resources with which the SUL is configured; using the SUL when the selected carrier is the SUL; when the selected carrier is the NUL, switching the activated BWP to an initial BWP on which the four-step random access resources and the two-step random access resources exist simultaneously;

22. The method of claim 19, wherein the selecting a SUL or NUL according to the random access type comprises:

23. The method according to claim 20, wherein said selecting supplemental uplink SUL or normal uplink NUL according to a predefined second criterion comprises: selecting the SUL when the designated RSRP is less than a second RSRP threshold; selecting the NUL when the specified RSRP is greater than the second RSRP threshold.

24. An apparatus for selecting a random access type, the apparatus supporting both a four-step random access scheme and a two-step random access scheme, the apparatus comprising: a processing module for determining an activated first upstream bandwidth part BWP; the processing module is further configured to select a random access type according to a predefined first criterion when a four-step random access resource and a two-step random access resource are simultaneously configured on the activated first uplink BWP;

the processing module is further configured to switch the activated upstream BWP from the first upstream BWP to an initial upstream BWP when no random access resource exists on the first upstream BWP, where the four-step random access resource and the two-step random access resource exist on the initial upstream BWP at the same time.

25. The apparatus of claim 24, wherein the processing module is further configured to select the four-step random access mode when a designated Reference Signal Received Power (RSRP) is less than an RSRP threshold; and when the designated RSRP is larger than the RSRP threshold value, selecting the two-step random access mode.

26. The apparatus of claim 24, wherein the processing module is further configured to select the four-step random access mode when a first trigger event exists; and when a second trigger event exists, selecting the two-step random access mode.

27. The apparatus of claim 26, wherein the first trigger event has a lower priority than the second trigger event.

28. The apparatus of claim 26, wherein the first trigger event comprises: an initial access event; the second trigger event comprises: at least one of a beam failure recovery event and a handover event.

29. The apparatus of claim 24, wherein the processing module is further configured to select the two-step random access scheme when there is a specific logical channel triggering random access; wherein the designated logical channel is a logical channel having a priority higher than a preset condition.

30. The apparatus of claim 24, wherein the processing module is further configured to generate a first random number; when the first random number is smaller than a random number threshold value, selecting the four-step random access mode; when the first random number is larger than the random number threshold value, selecting the two-step random access mode; or, the processing module is further configured to generate a second random number; when the second random number is larger than the random number threshold value, selecting the four-step random access mode; and when the second random number is smaller than the random number threshold value, selecting the two-step random access mode.

31. The apparatus according to any of the claims 24 to 30, wherein said processing module is further configured to select an supplemental uplink SUL or a normal uplink NUL according to a predefined second criterion.

32. The apparatus of claim 31, wherein the processing module is further configured to select the SUL when the specified RSRP is less than a second RSRP threshold; selecting the NUL when the specified RSRP is greater than the second RSRP threshold.

33. An apparatus for selecting a random access type, the apparatus supporting both a four-step random access scheme and a two-step random access scheme, the apparatus comprising: a processing module for selecting a random access type according to a predefined first criterion; the processing module is further configured to determine an activated bandwidth part BWP according to the random access type;

the processing module is configured to switch to an initial uplink BWP when no random access resource is configured on the activated uplink BWP, and execute a random access procedure using the random access resource corresponding to the random access type on the initial uplink BWP.

34. The apparatus of claim 33, wherein the processing module is configured to select the four-step random access mode when a designated Reference Signal Received Power (RSRP) is less than a first RSRP threshold; and when the designated RSRP is larger than the first RSRP threshold value, selecting the two-step random access mode.

35. The apparatus of claim 33, wherein the processing module is configured to select the four-step random access mode when a first trigger event exists; and when a second trigger event exists, selecting the two-step random access mode.

36. The apparatus of claim 35, wherein the first trigger event has a lower priority than the second trigger event.

37. The apparatus of claim 35, wherein the first trigger event comprises: an initial access event; the second trigger event comprises: at least one of a beam failure recovery event and a handover event.

38. The apparatus of claim 33, wherein the processing module is configured to select the two-step random access scheme when there is a specific logical channel triggering random access; wherein the designated logical channel is a logical channel having a priority higher than a preset condition.

39. The apparatus of claim 33, wherein the processing module is configured to generate a first random number; when the first random number is smaller than a random number threshold value, selecting the four-step random access mode; when the first random number is larger than the random number threshold value, selecting the two-step random access mode; or, the processing module is configured to generate a second random number; when the second random number is larger than the random number threshold value, selecting the four-step random access mode; and when the second random number is smaller than the random number threshold value, selecting the two-step random access mode.

40. The apparatus according to any of claims 33 to 39, wherein the processing module is further configured to perform a random access procedure using a random access resource corresponding to the random access type when the random access resource is configured on the activated uplink BWP.

41. The apparatus according to any of claims 33 to 39, wherein the processing module is further configured to switch to an initial uplink BWP when no random access resource corresponding to the random access type is configured on the activated uplink BWP, and perform a random access procedure using the random access resource corresponding to the random access type on the initial uplink BWP; or, the processing module is configured to switch to a target uplink BWP when no random access resource corresponding to the random access type is configured on the activated uplink BWP, and perform a random access procedure using the random access resource corresponding to the random access type on the target uplink BWP, where the target uplink BWP is a BWP configured with the random access resource corresponding to the random access type.

42. The apparatus according to any of the claims 33 to 39, wherein said processing module is configured to select an supplemental uplink SUL or a normal uplink NUL according to said random access type.

43. The apparatus of claim 42, wherein the processing module is configured to obtain the configured random access resources on the SUL and the NUL when the random access type is the two-step random access mode; selecting the SUL or the NUL according to a predefined second criterion when two-step random access resources are configured on both the SUL and the NUL.

44. The apparatus of claim 42, wherein the processing module is configured to obtain the configured random access resources on the SUL and the NUL when the random access type is the two-step random access mode; the processing module to select the SUL or the NUL according to a predefined second criterion when there is only two-step random access resources configured with the SUL; using the SUL when the selected carrier is the SUL; when the selected carrier is NUL, switching the activated BWP to an initial BWP, wherein the four-step random access resource and the two-step random access resource exist on the initial BWP at the same time; the processing module to select the SUL or the NUL according to a predefined second criterion when there is only the NUL configured with the two-step random access resources; using the NUL when the selected carrier is the NUL; when the selected carrier is the SUL, switching the activated BWP to the initial BWP on which the four-step random access resources and the two-step random access resources exist simultaneously.

45. The apparatus of claim 42, wherein the processing module is configured to select the SUL or the NUL according to a predefined second criterion when the random access type is the four-step random access mode.

46. The apparatus of claim 43, wherein the processing module is configured to select the SUL when the specified RSRP is less than a second RSRP threshold; selecting the NUL when the specified RSRP is greater than the second RSRP threshold.

47. A terminal, characterized in that the terminal comprises:

a processor;

a memory for storing executable instructions of the processor;

wherein the processor is configured to load and execute the executable instructions to implement the method of random access type selection according to any one of claims 1 to 23.

48. A computer-readable storage medium, having stored therein at least one instruction, at least one program, a set of codes, or a set of instructions, which is loaded and executed by a processor to implement the method for selecting a random access type according to any one of claims 1 to 23.