CN110621081B

CN110621081B - Random access method and terminal equipment

Info

Publication number: CN110621081B
Application number: CN201810632519.XA
Authority: CN
Inventors: 鲍炜; 吴昱民
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2018-06-19
Filing date: 2018-06-19
Publication date: 2021-03-23
Anticipated expiration: 2038-06-19
Also published as: CN110621081A

Abstract

The embodiment of the application provides a random access method and terminal equipment, relates to the technical field of communication, and is used for solving the problem of high competition risk in the random access process. The method comprises the following steps: in the case that it is determined that there is no SSB with a signal quality greater than a threshold, and there is no CSI-RS with an associated CFRA resource configured and a signal quality greater than a threshold, selecting a first SSB, and in the case that the first SSB has an associated CFRA resource configured, selecting and transmitting a first preamble from a first preamble set including preambles corresponding to the CFRA resource associated with the first SSB, or selecting a first CSI-RS, and in the case that the first CSI-RS has an associated CFRA resource configured, transmitting a second preamble from the first preamble set including preambles corresponding to the CFRA resource associated with the first CSI-RS. The embodiment of the invention is used for random access.

Description

Random access method and terminal equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to a random access method and a terminal device.

Background

Random Access (Random Access) refers to a network Access method in which a terminal device sends a Random Access preamble (preamble) to a network side device to attempt to establish a basic signaling connection with a network.

The random access generally includes: a non-Contention Random Access (CFRA) mode and a Contention Based Random Access (CBRA) mode; in the CFRA process, the network side device allocates the associated CFRA resources for the terminal device on one or more beams (beams), and informs the terminal device of a synchronization Information Block (SSB) and/or a Channel State Information Reference Signal (CSI-RS) corresponding to the beam to which the associated CFRA resource is allocated in advance, an index (index) of the corresponding preamble and a signal quality threshold of the SSB and/or CSI-RS, when there are one or more SSBs that configure associated CFRA resources and the signal quality is greater than the SSB signal quality threshold, the terminal equipment selects an SSB which is configured with the associated CFRA resources and has signal quality greater than an SSB signal quality threshold value, and a preamble which is distributed by the network side equipment for the terminal equipment and corresponds to the CFRA associated with the selected SSB is sent to the network side equipment; when one or more CSI-RSs which are configured with associated CFRA resources and have signal quality larger than a CSI-RS signal quality threshold exist, the terminal equipment selects one CSI-RS which is configured with associated CFRA resources and have signal quality larger than the CSI-RS signal quality threshold and a preamble corresponding to the associated CFRA of the selected CSI-RS to send a random access signal to the network side equipment; when there is no SSB configured with the associated CFRA resource and having a signal quality greater than an SSB signal quality threshold, or there is no CSI-RS configured with the CFRA resource and having a signal quality greater than a CSI-RS signal quality threshold, or there is an SSB not configured with the CFRA resource and having a signal quality greater than an SSB signal quality threshold, the terminal device selects an SSB not configured with the associated CFRA resource and having a signal quality greater than an SSB signal quality threshold, and a preamble corresponding to the CBRA resource associated with the SSB to send to the network side device; when there is no SSB configured with the associated CFRA resource and having a signal quality greater than the SSB signal quality threshold, there is no CSI-RS configured with the associated CFRA resource and having a signal quality greater than the CSI-RS signal quality threshold, and there is no SSB not configured with the associated CFRA resource and having a signal quality greater than the SSB signal quality threshold, the terminal device selects any SSB and one preamble corresponding to the CBRA resource associated with the selected SSB to transmit to the network side device.

In the prior art, when there is no SSB configured with the associated CFRA resource and having a signal quality greater than an SSB signal quality threshold, there is no CSI-RS configured with the associated CFRA resource and having a signal quality greater than a CSI-RS signal quality threshold, and there is no SSB not configured with the associated CFRA resource and having a signal quality greater than an SSB signal quality threshold, the SSB selected by the terminal device may be an SSB not configured with the associated CFRA resource or an SSB configured with the associated CFRA resource, but no matter whether the SSB selected by the terminal device is configured with the associated CFRA resource, a preamble corresponding to the associated CBRA resource of the selected SSB is used to transmit to the network side device, so that a contention risk in a random access process of the terminal device is large.

Disclosure of Invention

The embodiment of the application provides a random access method and terminal equipment, which are used for solving the problem of high competition risk in the random access process of the terminal equipment.

In order to solve the technical problem, the present application is implemented as follows:

in a first aspect, an embodiment of the present application provides a random access method, which is applied to a terminal device, and the method includes:

under the condition that it is determined that there is no SSB satisfying a first preset condition and no CSI-RS satisfying a second preset condition in a first cell, selecting a first SSB from the SSBs of the first cell or selecting a first CSI-RS from a target CSI-RS set, where the first cell is a cell where the terminal device initiates random access, and the first preset condition is: the signal quality is greater than the SSB signal quality threshold, and the second preset condition is: configuring associated non-contention random access (CFRA) resources and enabling the signal quality to be larger than a channel state information-reference signal (CSI-RS) signal quality threshold value;

under the condition that the first SSB is selected and the first SSB is configured with associated CFRA resources, selecting a first preamble in a first preamble set, and sending the first preamble on PRACH time-frequency resources corresponding to the first SSB, wherein the first preamble set comprises preambles corresponding to the CFRA resources associated with the first SSB;

and under the condition that the first CSI-RS is selected and the first CSI-RS is configured with the associated CFRA resources, selecting a second preamble in a second preamble set, and sending the second preamble on the PRACH time frequency resource corresponding to the first CSI-RS, wherein the second preamble set comprises the preamble corresponding to the CFRA resources associated with the first CSI-RS.

In a second aspect, an embodiment of the present application provides a terminal device, including:

a processing unit, configured to select a first SSB from the SSBs of a first cell or a first CSI-RS from a target CSI-RS set when it is determined that there is no SSB that satisfies a first preset condition and there is no CSI-RS that satisfies a second preset condition in the first cell, where the first cell is a cell in which the terminal device initiates random access, and the first preset condition is: the signal quality is greater than the SSB signal quality threshold, and the second preset condition is: configuring associated non-contention random access (CFRA) resources and enabling the signal quality to be larger than a channel state information-reference signal (CSI-RS) signal quality threshold value;

the processing unit is further configured to select a first preamble from a first preamble set when the first SSB is selected and the first SSB configures associated CFRA resources;

a sending unit, configured to send the first preamble selected by the processing unit on a PRACH time-frequency resource corresponding to the first SSB, where the first preamble set includes preambles corresponding to CFRA resources associated with the first SSB;

the processing unit is further configured to select a second preamble from a second preamble set when the first CSI-RS is selected and the first CSI-RS configures an associated CFRA resource;

the sending unit is further configured to send the second preamble selected by the processing unit on a PRACH time-frequency resource corresponding to the first CSI-RS, where the second preamble set includes a preamble corresponding to a CFRA resource associated with the first CSI-RS.

In a third aspect, an embodiment of the present application provides a terminal device, including a processor, a memory, and a computer program stored on the memory and executable on the processor, where the computer program, when executed by the processor, implements the steps of the random access method according to the first aspect.

In a fourth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the steps of the random access method according to the first aspect.

In the random access method provided by the embodiment of the present invention, when it is determined that there is no SSB having a signal quality greater than an SSB signal quality threshold in a cell where a terminal device initiates random access, and there is no CSI-RS having an associated CFRA resource configured and a signal quality greater than a CSI-RS signal quality threshold, a first SSB is selected in the SSB of the first cell or a first CSI-RS is selected in a target CSI-RS set, and when the first SSB is selected and the first SSB has an associated CFRA resource configured, a first preamble is selected in a first preamble set including a preamble corresponding to the CFRA resource associated with the first SSB, and the first preamble is sent on a PRACH time-frequency resource corresponding to the first SSB, and when the first CSI-RS is selected and the first CSI-RS has an associated CFRA resource configured, selecting a second preamble from a second preamble set comprising a CFRA resource associated with the first CSI-RS, and sending the second preamble on a PRACH time-frequency resource corresponding to the first CSI-RS, wherein the selected preamble may be a preamble corresponding to a CFRA resource associated with the first SSB or a preamble corresponding to a CFRA resource associated with the first CSI-RS when the first SSB configures an associated CFRA resource, because the first preamble is selected from the first preamble set comprising a preamble corresponding to a CFRA resource associated with the first SSB, or the second preamble is selected from the second preamble set comprising a preamble corresponding to a CFRA resource associated with the first CSI-RS, if the first SSB configures an associated CFRA resource or the first CSI-RS configures an associated CFRA resource, therefore, the embodiment of the invention can reduce the competition risk in the random access process of the terminal equipment.

Drawings

Fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application;

fig. 2 is a flowchart illustrating steps of a random access method according to an embodiment of the present application;

fig. 3 is a second flowchart illustrating steps of a random access method according to an embodiment of the present application;

fig. 4 is a third flowchart illustrating steps of a random access method according to an embodiment of the present application;

fig. 5 is a flowchart illustrating steps of a random access method according to an embodiment of the present application;

fig. 6 is a flowchart illustrating steps of a random access method according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 8 is a schematic diagram of a hardware structure of a terminal device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship; in the formula, the character "/" indicates that the preceding and following related objects are in a relationship of "division". The term "plurality" herein means two or more, unless otherwise specified.

For the convenience of clearly describing the technical solutions of the embodiments of the present application, in the embodiments of the present application, the terms "first" and "second" are used to distinguish the same items or similar items with basically the same functions or actions, and those skilled in the art can understand that the terms "first" and "second" are not limited to the quantity and execution order.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present associated concepts in a concrete fashion. In the embodiments of the present application, the meaning of "a plurality" means two or more unless otherwise specified.

Based on the above problem, an embodiment of the present application provides a random access method and a terminal device, where in a case that it is determined that there is no SSB with a signal quality greater than an SSB signal quality threshold in a cell where the terminal device initiates random access, and there is no CSI-RS with a configured associated CFRA resource and a signal quality greater than a CSI-RS signal quality threshold, a first SSB is selected in the SSB of the first cell or a first CSI-RS is selected in a target CSI-RS set, and in a case that the first SSB is selected and the first SSB is configured with an associated CFRA resource, a first preamble is selected in a first preamble set including a preamble corresponding to the CFRA resource associated with the first SSB, and the first preamble is sent on a PRACH time frequency resource corresponding to the first SSB; or under the condition that the first CSI-RS is selected and the first CSI-RS is configured with the associated CFRA resources, selecting a second preamble from a second preamble set comprising the preambles corresponding to the CFRA resources associated with the first CSI-RS, and sending the second preamble on the PRACH time-frequency resource corresponding to the first CSI-RS. Since the first preamble is selected from the first preamble set including the preamble corresponding to the CFRA resource associated with the first SSB if the first SSB configures the associated CFRA resource, or the second preamble is selected from the second preamble set including the preamble corresponding to the CFRA resource associated with the first CSI-RS if the first CSI-RS configures the associated CFRA resource, when the first SSB configures the associated CFRA resource or the first CSI-RS configures the associated CFRA resource, the selected preamble may be the preamble corresponding to the CFRA resource associated with the first SSB or the preamble corresponding to the CFRA resource associated with the first CSI-RS, so that the contention risk in the random access process of the terminal device may be reduced.

The technical scheme provided by the application can be applied to various multi-carrier system communication systems, such as a 5G communication system, a future evolution system or a plurality of communication fusion systems and the like. A variety of application scenarios may be included, for example, scenarios such as Machine to Machine (M2M), D2M, macro and micro Communication, enhanced Mobile Broadband (eMBB), ultra high reliability and ultra Low Latency Communication (urrllc), and mass internet of things Communication (mtc). These scenarios include, but are not limited to: the communication between the terminal device and the terminal device, the communication between the network side device and the network side device, the communication between the network side device and the terminal device, and the like. The embodiment of the application can be applied to communication between network side equipment and terminal equipment in a 5G communication system, or communication between the terminal equipment and the terminal equipment, or communication between the network side equipment and the network side equipment.

Fig. 1 shows a schematic diagram of a possible structure of a communication system according to an embodiment of the present application. As shown in fig. 1, the communication system may include: a network side device 11 (shown in fig. 1 by taking the network side device as a base station as an example), and a terminal device 12 (shown in fig. 1 by taking the terminal device as a mobile phone as an example). The terminal device 12 may communicate with a Network side device 11 forming a Radio Access Network (RAN), where the Network side device 11 generates a plurality of carriers, and each carrier corresponds to a cell.

Further, the network-side device 11 may be a base station, a core network device, a Transmission and Reception node (TRP), a relay station, an access Point, or the like. The network side device may be a Base Transceiver Station (BTS) in a Global System for Mobile communication (GSM) or Code Division Multiple Access (CDMA) network, may be an nb (nodeb) in Wideband Code Division Multiple Access (WCDMA), and may be an eNB or enodeb (evolved nodeb) in LTE. The Network side device 11 may also be a wireless controller in a Cloud Radio Access Network (CRAN) scene, or a Network side device in a 5G communication system or a Network side device in a future evolution Network.

The terminal device 12 may be a mobile terminal or a non-mobile terminal, and in particular, the terminal device may be a device providing voice and/or other traffic data connectivity to a user, a handheld device having wireless communication functionality, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved PLMN network, and the like. In addition, the terminal device may communicate with one or more core networks via a Radio Access Network (RAN), and the Mobile terminal may be, for example, a Mobile phone (or referred to as a "cellular" phone) and a computer with a Mobile terminal, such as a portable, pocket, hand-held, computer-included or vehicle-mounted Mobile device, which exchange languages and/or data with the RAN, and Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like, and the Wireless terminal may also be a Mobile device, a UE terminal, an Access terminal, a Wireless Communication device, a terminal unit, a terminal Station, a Mobile Station (Mobile Station), a Mobile terminal, or a Mobile terminal, A Mobile Station (Mobile), a Remote Station (Remote Station), a Remote Station, a Remote Terminal (Remote Terminal), a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a User Agent (User Agent), a Terminal device, and the like. As an example, in the embodiment of the present application, fig. 1 illustrates that the terminal device is a mobile phone.

The first embodiment,

An embodiment of the present invention provides a random access method, and specifically, as shown in fig. 2, the method includes the following steps S11-S13.

S11, under the condition that it is determined that the first cell does not have the SSB meeting the first preset condition and does not have the CSI-RS meeting the second preset condition, selecting the first SSB from the SSBs of the first cell or selecting the first CSI-RS from the target CSI-RS set.

The first cell is a cell for initiating random access by the terminal device, and the first preset condition is that: the signal quality is greater than the SSB signal quality threshold, and the second preset condition is: associated non-contention random access, CFRA, resources are configured and the signal quality is greater than a CSI-RS signal quality threshold.

In the step S11, if the first SSB is selected and the first SSB configures the associated CFRA resource, then step S12 is executed; if the first CSI-RS is selected and the first CSI-RS configures the associated CFRA resource, step S13 is executed.

S12, selecting a first lead code from the first lead code set, and sending the first lead code on a PRACH time frequency resource (PRACH occupancy) corresponding to the first SSB.

Wherein the first set of preambles includes a preamble corresponding to a CFRA resource associated with the first SSB.

Specifically, if the CFRA resource is selected by the terminal device, the terminal device sends the first preamble on the PRACH time-frequency resource corresponding to the CFRA resource associated with the first SSB.

S13, selecting a second lead code from the second lead code set, and sending the second lead code on the PRACH time-frequency resource corresponding to the first CSI-RS.

Specifically, if the CFRA resource is selected by the terminal device, the terminal device sends the second preamble on the PRACH time-frequency resource corresponding to the CFRA resource associated with the first CSI-RS.

It should be noted that, since the step S11 selects the first SSB from the SSBs of the first cell or the first CSI-RS from the target CSI-RS set, and does not select the first SSB from the SSBs of the first cell and the first CSI-RS from the target CSI-RS set at the same time, the above steps S12 and S13 are performed by selecting one. That is, step S12 may be performed, and step S13 may also be performed, but steps S12 and S13 are not performed at the same time.

Wherein the second set of preambles includes a preamble corresponding to a CFRA resource associated with the first CSI-RS.

Specifically, the following describes in detail the implementation of the random access method provided in the foregoing embodiment:

the first implementation mode,

Referring to fig. 3, a specific implementation may include the following steps:

and S31, the terminal equipment receives the configuration information sent by the network side equipment.

Wherein the configuration information comprises: the SSB signal quality threshold, the SSBs to which the associated CFRA resources are configured, and the CFRA resources associated with each of the SSBs to which the associated CFRA resources are configured.

For example, the SSBs configured with the associated CFRA resource and the CFRA resource associated with each of the SSBs configured with the associated CFRA resource may be encapsulated in the configuration information in the form of a correspondence table shown in table 1 below, as shown in table 1 below, including: the SSB list and the CFRA resources associated with each SSB in the SSB list.

Furthermore, it should be noted that the CFRA resources associated with the SSB in the embodiment of the present invention at least include: a PRACH Mask index (PRACH Mask index) and a Random Access Preamble index (Random Access Preamble index), where the PRACH Mask index may demarcate a subset for all PRACH time-frequency resources corresponding to the SSB, and on the PRACH time-frequency resources of the subset, there are CFRA resources that the network allocates to the terminal device; the random access preamble index indicates a preamble assigned to the terminal device for exclusive use.

TABLE 1

S32, the terminal device measures the signal quality of all SSBs in the first cell.

Specifically, the terminal device may measure one or more of a Reference Signal Receiving Power (RSRP), a Reference Signal Received Quality (RSRQ), and a Received Signal Strength Indication (RSSI) of a Reference Signal of each SSB, and characterize the Signal Quality of the corresponding SSB by a combination of one or more measurement results obtained by measuring the Reference Signal.

S33, the terminal device determines whether the signal quality of all SSBs in the first cell is less than or equal to the SSB signal quality threshold.

In the above step S33, if it is determined that the signal quality of all SSBs in the first cell is less than or equal to the SSB signal quality threshold, then step S34 is executed.

S34, the terminal device determines that there is no SSB satisfying the first preset condition and there is no CSI-RS satisfying the second preset condition in the first cell.

Specifically, as can be seen from the content included in the configuration information received by the terminal device in step S31, the network-side device only configures the associated CFRA resource for one or more SSBs, and therefore it is certain that there is no CFRA resource configured and the signal quality is greater than the CSI-RS signal quality threshold, and therefore when it is determined that the signal quality of all SSBs in the first cell is less than or equal to the SSB signal quality threshold, it may be directly determined that there is no SSB in the first cell that satisfies the first preset condition and there is no CSI-RS that satisfies the second preset condition.

It should be noted that the judgment result in the step S34 may be: and when the signal quality of the one or more SSBs existing in the first cell is greater than the SSB signal quality threshold, the subsequent random access procedure is the same as the prior art. That is, when there are one or more SSBs configured with the associated CFRA resource and having a signal quality greater than the SSB signal quality threshold, the terminal device selects one SSB configured with the associated CFRA resource and having a signal quality greater than the SSB signal quality threshold, and the network-side device transmits, to the network-side device, the preamble allocated to the terminal device by the network-side device and corresponding to the CFRA associated with the selected SSB; when there is no SSB configured with the associated CFRA resource and having a signal quality greater than the SSB signal quality threshold and there is an SSB not configured with the CFRA resource and having a signal quality greater than the SSB signal quality threshold, the terminal device selects an SSB not configured with the associated CFRA resource and having a signal quality greater than the SSB signal quality threshold and a preamble corresponding to the CBRA resource associated with the SSB to send to the network-side device.

S35, the terminal device selects a first SSB from the SSBs of the first cell.

Specifically, the terminal device may select the first SSB from the SSBs of the first cell based on a certain algorithm, for example: one SSB is randomly selected among the SSBs of the first cell with equal probability. The embodiment of the present invention does not limit the implementation manner of selecting the first SSB from the SSBs of the first cell by the terminal device.

S36, the terminal device determines whether the first SSB configures the associated CFRA resource.

In the above step S36, if the first SSB configures the associated CFRA resource, step S37 is executed.

S37, the terminal device selects a first preamble from the first preamble set.

The first set of preambles includes a preamble corresponding to a CFRA resource associated with the first SSB.

Optionally, the first preamble set is a preamble set formed by a preamble corresponding to the CFRA resource associated with the first SSB and a preamble corresponding to the contention random access CBRA resource associated with the first SSB.

That is, the first preamble is selected from the preambles corresponding to the CFRA resource associated with the first SSB and the contention random access CBRA resource associated with the first SSB. In addition, the first preamble can also be selected from preambles corresponding to random access resources (including CFRA and CBRA) of the first SSB.

Optionally, the first preamble set is a preamble set formed by preambles corresponding to CFRA resources associated with the first SSB.

Namely, the first preamble is selected from the preambles corresponding to the CFRA resources associated with the first SSB.

S38, the terminal device sends the first preamble on a Physical Random Access Channel (PRACH) time-frequency resource corresponding to the first SSB.

Since the first preamble is selected and sent from the first preamble set including the preamble corresponding to the CFRA resource associated with the first SSB when the first SSB configures the associated CFRA resource, the selected and sent first preamble may be the preamble corresponding to the CFRA resource associated with the first SSB, and compared with the prior art in which the preamble corresponding to the CBRA resource associated with the first SSB is selected, the embodiment of the present invention can reduce the contention risk in the random access process of the terminal device.

The second implementation mode,

Referring to fig. 4, the second implementation may specifically include the following steps:

and S41, the terminal equipment receives the configuration information sent by the network side equipment.

The configuration information includes: the SSB signal quality threshold, the CSI-RS signal quality threshold, CSI-RSs with associated CFRA resources configured, and CFRA resources associated with each of the CSI-RSs with associated CFRA resources configured.

For example, the CSI-RS configured with the associated CFRA resource and the CFRA resource associated with each CSI-RS configured with the associated CFRA resource may be encapsulated in the configuration information in the form of a correspondence table shown in table 2 below, as shown in table 2 below, including: a CSI-RS list and CFRA resources associated with each CSI-RS in the CSI-RS list.

Also, it should be noted that, the CFRA resources associated with the CSI-RS in the embodiment of the present invention at least include: a PRACH Mask index (PRACH Mask index) and a Random Access Preamble index (Random Access Preamble index), where the PRACH Mask index may demarcate a subset for all PRACH time-frequency resources corresponding to the CSI-RS, and on the PRACH time-frequency resources of the subset, there are CFRA resources that the network allocates to the terminal device; the random access preamble index indicates a preamble assigned to the terminal device for exclusive use.

TABLE 2

S42, the terminal device measures the signal quality of each CSI-RS configured with the associated CFRA resource and the signal quality of all SSBs in the first cell.

Specifically, the terminal device may measure one or more of a Reference Signal Receiving Power (RSRP), a Reference Signal Received Quality (RSRQ), and a Received Signal Strength Indication (RSSI) of a Reference Signal of each CSI-RS or SSB, and characterize the Signal Quality of the corresponding CSI-RS or SSB by a combination of one or more measurement results obtained by measuring the Reference Signal.

S43, the terminal equipment judges whether the signal quality of each CSI-RS configured with the associated CFRA resources is less than or equal to the CSI-RS signal quality threshold value.

S44, the terminal device determines whether the signal quality of all SSBs in the first cell is less than or equal to the SSB signal quality threshold.

In the above steps S43 and S44, if it is determined that the signal quality of each CSI-RS configuring the associated CFRA resource is less than or equal to the CSI-RS signal quality threshold and the signal quality of all SSBs in the first cell is less than or equal to the SSB signal quality threshold, the following step S45 is performed.

S45, the terminal device determines that there is no SSB satisfying the first preset condition and there is no CSI-RS satisfying the second preset condition in the first cell.

It should be noted that the judgment result in the step S43 may be: there are one or more CSI-RSs configured with associated non-contention random access CFRA resources and having a signal quality greater than a CSI-RS signal quality threshold, and when there are one or more CSI-RSs configured with associated non-contention random access CFRA resources and having a signal quality greater than a CSI-RS signal quality threshold, the subsequent random access procedure is the same as in the prior art. That is, when there are one or more CSI-RSs configured with associated CFRA resources and having signal quality greater than the CSI-RS signal quality threshold, the terminal device selects one CSI-RS configured with associated CFRA resources and having signal quality greater than the CSI-RS signal quality threshold, and the preamble allocated to the terminal device by the network-side device and corresponding to the CFRA associated with the selected CSI-RS is transmitted to the network-side device.

It should be noted that the judgment result in the step S44 may be: and when the signal quality of the one or more SSBs existing in the first cell is greater than the SSB signal quality threshold, the subsequent random access procedure is the same as the prior art. That is, when there are one or more SSBs configured with the associated CFRA resource and having a signal quality greater than the SSB signal quality threshold, the terminal device selects one SSB configured with the associated CFRA resource and having a signal quality greater than the SSB signal quality threshold, and the network-side device transmits, to the network-side device, the preamble allocated to the terminal device by the network-side device and corresponding to the CFRA associated with the selected SSB; when there is no SSB configured with the associated CFRA resource and having a signal quality greater than the SSB signal quality threshold and there is an SSB not configured with the CFRA resource and having a signal quality greater than the SSB signal quality threshold, the terminal device selects an SSB not configured with the associated CFRA resource and having a signal quality greater than the SSB signal quality threshold and a preamble corresponding to the CBRA resource associated with the SSB to send to the network-side device.

S46, the terminal equipment selects a first CSI-RS from the target CSI-RS set.

Optionally, the target CSI-RS set is a CSI-RS set formed by CSI-RSs configured with associated CFRA resources.

That is, the first CSI-RS is selected from CSI-RSs all configured with the associated CFRA resource.

Optionally, the target CSI-RS set is a CSI-RS set formed by all CSI-RSs configured by the terminal device.

Namely, the first CSI-RS is selected from all the CSI-RSs configured by the terminal equipment (including the CSI-RSs configured with the associated CFRA resources and the CSI-RSs not configured with the associated CFRA resources).

In addition, the terminal device may select the first CSI-RS from the target CSI-RS set based on a certain algorithm, for example: one CSI-RS is randomly selected among CSI-RSs of the first cell with equal probability. The embodiment of the invention does not limit the implementation mode of selecting the first CSI-RS in the target CSI-RS set by the terminal equipment.

S47, the terminal equipment judges whether the first CSI-RS configures the associated CFRA resources.

In the above step S47, if the first CSI-RS configures the associated CFRA resource, step S48 is performed.

S48, the terminal device selects a second preamble from the second preamble set.

The second preamble set includes a preamble corresponding to a CFRA resource associated with the first CSI-RS.

Optionally, the second preamble set is a preamble set formed by a preamble corresponding to the CFRA resource associated with the first CSI-RS and a preamble corresponding to the contention random access CBRA resource associated with the first CSI-RS.

That is, a second preamble is selected from the preambles corresponding to the CFRA resource associated with the first CSI-RS and the contention random access CBRA resource associated with the first CSI-RS. In addition, the second preamble can also be selected from preambles corresponding to random access resources (including CFRA and CBRA) of the first CSI-RS.

Optionally, the second preamble set is a preamble set formed by preambles corresponding to CFRA resources associated with the first CSI-RS.

Namely, a second preamble is selected from the preambles corresponding to the CFRA resources associated with the first CSI-RS.

And S49, the terminal equipment sends the second preamble on a Physical Random Access Channel (PRACH) time-frequency resource corresponding to the first CSI-RS.

Since the second preamble is selected and sent in the second preamble set including the preamble corresponding to the CFRA resource associated with the first CSI-RS when the first CSI-RS configures the associated CFRA resource, and the selected and sent second preamble may be the preamble corresponding to the CFRA resource associated with the first CSI-RS, compared with the prior art in which the preamble corresponding to the CBRA resource associated with the first SSB is selected, the contention risk in the random access process of the terminal device can be reduced.

The third implementation mode,

Referring to fig. 5, the third implementation may specifically include the following steps:

and S51, the terminal equipment receives the configuration information sent by the network side equipment.

The configuration information includes: an SSB signal quality threshold, an SSB configured with associated CFRA resources, a CFRA resource associated with each of the SSBs configured with associated CFRA resources, the CSI-RS signal quality threshold, a CSI-RS configured with associated CFRA resources, and a CFRA resource associated with each of the CSI-RSs configured with associated CFRA resources.

For example, the SSBs configured with the associated CFRA resource and the CFRA resource associated with each of the SSBs configured with the associated CFRA resource may be encapsulated in the configuration information in the manner of the correspondence table shown in table 1 above; the CSI-RS configured with the associated CFRA resource and the CFRA resource associated with each of the CSI-RS configured with the associated CFRA resource may be encapsulated in the configuration information in the manner of the correspondence table shown in table 2 above.

S52, the terminal device measures the signal quality of each CSI-RS configured with the associated CFRA resource and the signal quality of all SSBs in the first cell.

And S53, the terminal equipment judges that the signal quality of each CSI-RS configured with the associated CFRA resources is less than or equal to the CSI-RS signal quality threshold.

S54, the terminal equipment judges that the signal quality of all SSBs in the first cell is less than or equal to the SSB signal quality threshold.

In the above steps S53 and S54, if it is determined that the signal quality of each CSI-RS configuring the associated CFRA resource is less than or equal to the CSI-RS signal quality threshold and the signal quality of all SSBs in the first cell is less than or equal to the SSB signal quality threshold, the following step S55 is performed.

S55, the terminal device determines that there is no SSB satisfying the first preset condition and there is no CSI-RS satisfying the second preset condition in the first cell.

It should be noted that the judgment result in the step S55 may be: when there are one or more CSI-RSs configured with associated non-contention random access CFRA resources and signal quality greater than the CSI-RS signal quality threshold and/or signal quality of one or more SSBs in the first cell is greater than the SSB signal quality threshold, the subsequent random access procedure is the same as the prior art when there are one or more CSI-RSs configured with associated non-contention random access CFRA resources and signal quality greater than the CSI-RS signal quality threshold and/or signal quality of one or more SSBs in the first cell is greater than the SSB signal quality threshold.

S56, the terminal equipment selects a first CSI-RS from the target CSI-RS set.

S57, the terminal equipment judges whether the first CSI-RS configures the associated CFRA resources.

In the above step S57, if the first CSI-RS configures the associated CFRA resource, step S58 is performed.

S58, the terminal device selects a second preamble from the second preamble set.

And S59, the terminal equipment sends the second preamble on a Physical Random Access Channel (PRACH) time-frequency resource corresponding to the first CSI-RS.

Since the second preamble is selected and sent in the second preamble set including the preamble corresponding to the CFRA resource associated with the first CSI-RS when the first CSI-RS configures the associated CFRA resource, the selected and sent second preamble may be the preamble corresponding to the CFRA resource associated with the first CSI-RS when the first CSI-RS configures the associated CFRA resource, and compared with the prior art in which the preamble corresponding to the CBRA resource associated with the first SSB is selected, the contention risk in the random access process of the terminal device may be reduced.

The implementation mode four,

Referring to fig. 6, the fourth implementation may specifically include the following steps:

and S61, the terminal equipment receives the configuration information sent by the network side equipment.

The SSB signal quality threshold, the SSBs in which the associated CFRA resources are configured, the CFRA resources associated with each of the SSBs in which the associated CFRA resources are configured, the CSI-RS signal quality threshold, the CSI-RSs in which the associated CFRA resources are configured, and the CFRA resources associated with each of the CSI-RSs in which the associated CFRA resources are configured.

S62, the terminal device measures the signal quality of each CSI-RS configured with the associated CFRA resource and the signal quality of all SSBs in the first cell.

And S63, the terminal equipment judges that the signal quality of each CSI-RS configured with the associated CFRA resources is less than or equal to the CSI-RS signal quality threshold.

S64, the terminal equipment judges that the signal quality of all SSBs in the first cell is less than or equal to the SSB signal quality threshold.

In the above steps S63 and S64, if it is determined that the signal quality of each CSI-RS configuring the associated CFRA resource is less than or equal to the CSI-RS signal quality threshold and the signal quality of all SSBs in the first cell is less than or equal to the SSB signal quality threshold, the following step S65 is performed.

S65, the terminal device determines that there is no SSB satisfying the first preset condition and there is no CSI-RS satisfying the second preset condition in the first cell.

It should be noted that, the explanation of each step in steps S61 to S65 may refer to the explanation of each step in steps S51 to S55 in the third implementation, and details are not described here for avoiding redundant description.

S66, the terminal device selects a first SSB from the SSBs of the first cell.

S67, the terminal device determines whether the first SSB configures the associated CFRA resource.

In the above step S67, if the first SSB configures the associated CFRA resource, step S68 is executed.

S68, the terminal device selects a first preamble from the first preamble set.

S69, the terminal device sends the first preamble on a Physical Random Access Channel (PRACH) time-frequency resource corresponding to the first SSB.

In addition, in addition to the above four implementation manners, when selecting the SSB or the CSI-RS in the first implementation manner, a first CSI-RS may be selected from the target CSI-RS set, however, since the associated CFRA resource is not configured for the CSI-RS, the selected first CSI-RS does not have a condition that the associated CFRA resource is configured for the selected first CSI-RS, and thus the implementation manner in this case is not limited by the embodiment of the present invention.

Similarly, when selecting the SSB or the CSI-RS in the second embodiment, the first SSB may also be selected from the SSBs of the first cell, however, since the associated CFRA resource is not configured for the SSB, the selected first SSB does not have the associated CFRA resource configured, and thus the implementation manner in this case is not limited in the embodiment of the present invention.

Example II,

An embodiment of the present invention further provides a terminal device, and specifically, as shown in fig. 7, the terminal device 700 includes:

a processing unit 71, configured to select a first SSB from SSBs of a first cell or select a first CSI-RS from a target CSI-RS set when it is determined that there is no SSB that satisfies a first preset condition and there is no CSI-RS that satisfies a second preset condition in the first cell, where the first cell is a cell where the terminal device initiates random access, and the first preset condition is: the signal quality is greater than the SSB signal quality threshold, and the second preset condition is: configuring associated non-contention random access (CFRA) resources and enabling the signal quality to be larger than a channel state information-reference signal (CSI-RS) signal quality threshold value;

the processing unit 71 is further configured to select a first preamble from a first preamble set if the first SSB is selected and the first SSB configures associated CFRA resources;

a sending unit 72, configured to send the first preamble selected by the processing unit 71 on a physical random access channel PRACH time-frequency resource corresponding to the first SSB, where the first preamble set includes preambles corresponding to CFRA resources associated with the first SSB;

the processing unit 71 is further configured to select a second preamble from a second preamble set when the first CSI-RS is selected and the first CSI-RS configures an associated CFRA resource;

the sending unit 72 is further configured to send the second preamble selected by the processing unit 71 on the PRACH time-frequency resource corresponding to the first CSI-RS, where the second preamble set includes preambles corresponding to CFRA resources associated with the first CSI-RS.

Optionally, the second preamble set is a preamble set formed by a preamble corresponding to the CFRA resource associated with the first CSI-RS and a preamble corresponding to the CBRA resource associated with the first CSI-RS.

Optionally, the target CSI-RS set is a CSI-RS set formed by configuring all CSI-RS for the terminal device.

Optionally, referring to fig. 7, the terminal device 700 further includes:

a receiving unit 73, configured to receive configuration information sent by a network side device, where the configuration information includes: the SSB signal quality threshold, SSBs in which associated CFRA resources are configured, and CFRA resources associated with each of the SSBs in which associated CFRA resources are configured;

a measuring unit 74, configured to measure signal quality of all SSBs in the first cell;

the processing unit 71 is specifically configured to determine that there is no SSB satisfying a first preset condition and there is no CSI-RS satisfying a second preset condition in the first cell when it is determined that the signal quality of all SSBs in the first cell is less than or equal to the SSB signal quality threshold.

Optionally, referring to fig. 7, the terminal device 700 further includes:

a receiving unit 73, configured to receive configuration information sent by a network side device, where the configuration information includes: the SSB signal quality threshold, the CSI-RS signal quality threshold, CSI-RSs with associated CFRA resources configured, and CFRA resources associated with each of the CSI-RSs with associated CFRA resources configured;

a measuring unit 74, configured to receive configuration information sent by a network side device, where the configuration information includes: the SSB signal quality threshold, the CSI-RS signal quality threshold, the CSI-RSs configured with the associated CFRA resources and the CFRA resources associated with each of the CSI-RSs configured with the associated CFRA resources, and measuring the signal quality of each of the CSI-RSs configured with the associated CFRA resources and the signal quality of all SSBs in the first cell;

the processing unit 71 is specifically configured to determine that there is no SSB satisfying a first preset condition and there is no CSI-RS satisfying a second preset condition in the first cell when it is determined that the signal quality of each CSI-RS configuring the associated CFRA resource is less than or equal to the CSI-RS signal quality threshold and the signal quality of all SSBs in the first cell is less than or equal to the SSB signal quality threshold.

Optionally, referring to fig. 7, the terminal device 700 further includes:

a receiving unit 73, configured to receive configuration information sent by a network side device, where the configuration information includes: the SSB signal quality threshold, the SSBs in which the associated CFRA resources are configured, the CFRA resources associated with each of the SSBs in which the associated CFRA resources are configured, the CSI-RS signal quality threshold, the CSI-RSs in which the associated CFRA resources are configured, and the CFRA resources associated with each of the CSI-RSs in which the associated CFRA resources are configured;

a measuring unit 74, configured to measure signal quality of each CSI-RS configured with the associated CFRA resource and signal quality of all SSBs in the first cell;

The terminal device provided in the embodiment of the present invention selects a first SSB from the SSB of the first cell or selects a first CSI-RS from a target CSI-RS set when it is determined that there is no SSB having a signal quality greater than an SSB signal quality threshold in a cell initiating random access and no CSI-RS having an associated CFRA resource configured and having a signal quality greater than a CSI-RS signal quality threshold, and selects a first preamble from a first preamble set including a preamble corresponding to the CFRA resource associated with the first SSB and transmits the first preamble on a PRACH time-frequency resource corresponding to the first SSB when the first SSB is selected and the first CSI-RS has an associated CFRA resource configured, selecting a second preamble from a second preamble set comprising a second preamble corresponding to the CFRA resource associated with the first CSI-RS, and sending the second preamble on the PRACH time-frequency resource corresponding to the first CSI-RS, because the first preamble is selected from a first preamble set comprising a preamble corresponding to the CFRA resource associated with the first SSB if the first SSB configures the associated CFRA resource, or the second preamble is selected from a second preamble set comprising a preamble corresponding to the CFRA resource associated with the first CSI-RS if the first CSI-RS configures the associated CFRA resource, the selected preamble may be the preamble corresponding to the CFRA resource associated with the first SSB if the first SSB configures the associated CFRA resource or the first CSI-RS configures the associated CFRA resource, therefore, the embodiment of the invention can reduce the competition risk in the random access process of the terminal equipment.

Fig. 8 is a schematic diagram of a hardware structure of a terminal device for implementing an embodiment of the present invention, where the terminal device 700 includes but is not limited to: radio frequency unit 101, network module 102, audio output unit 103, input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108, memory 109, processor 110, and power supply 111. Those skilled in the art will appreciate that the terminal device configuration shown in fig. 8 does not constitute a limitation of the terminal device, and that the terminal device may include more or fewer components than shown, or combine certain components, or a different arrangement of components. In the embodiment of the present application, the terminal device includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.

The processor 110 is configured to, when it is determined that there is no synchronization information block SSB that meets a first preset condition and there is no channel state information reference signal CSI-RS that meets a second preset condition in a first cell, select the first SSB in the SSB of the first cell or select the first CSI-RS in a target CSI-RS set, where the first cell is a cell where the terminal device initiates random access, and the first preset condition is: the signal quality is greater than the SSB signal quality threshold, and the second preset condition is: configuring associated non-contention random access (CFRA) resources and enabling the signal quality to be larger than a channel state information-reference signal (CSI-RS) signal quality threshold value;

the processor 110 is further configured to select a first preamble from a first preamble set if the first SSB is selected and the first SSB configures associated CFRA resources;

the radio frequency unit 101 is configured to send the first preamble selected by the processor 110 on a physical random access channel PRACH time-frequency resource corresponding to the first SSB, where the first preamble set includes preambles corresponding to CFRA resources associated with the first SSB;

the processor 110 is further configured to select a second preamble in a second preamble set if the first CSI-RS is selected and the first CSI-RS configures an associated CFRA resource;

the radio frequency unit 101 is further configured to send the second preamble selected by the processor 110 on a PRACH time-frequency resource corresponding to the first CSI-RS, where the second preamble set includes a preamble corresponding to a CFRA resource associated with the first CSI-RS.

It should be understood that, in the embodiment of the present application, the radio frequency unit 101 may be used for receiving and sending signals during a message sending and receiving process or a call process, and specifically, receives downlink data from a base station and then processes the received downlink data to the processor 110; in addition, the uplink data is transmitted to the base station. Typically, radio frequency unit 101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 101 can also communicate with a network and other devices through a wireless communication system.

The terminal device provides wireless broadband internet access to the user through the network module 102, such as helping the user send and receive e-mails, browse webpages, access streaming media, and the like.

The audio output unit 103 may convert audio data received by the radio frequency unit 101 or the network module 102 or stored in the memory 109 into an audio signal and output as sound. Also, the audio output unit 103 may also provide audio output associated with a specific function performed by the terminal device 700 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 103 includes a speaker, a buzzer, a receiver, and the like.

The input unit 104 is used to receive an audio or video signal. The input Unit 104 may include a Graphics Processing Unit (GPU) 1041 and a microphone 1042, and the Graphics processor 1041 processes image data of a still picture or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 106. The image frames processed by the graphic processor 1041 may be stored in the memory 109 (or other storage medium) or transmitted via the radio frequency unit 101 or the network module 102. The microphone 1042 may receive sound and may be capable of processing such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 101 in case of a phone call mode.

The terminal device 700 further comprises at least one sensor 105, such as light sensors, motion sensors and other sensors. Specifically, the light sensor includes an ambient light sensor that can adjust the brightness of the display panel 1061 according to the brightness of ambient light, and a proximity sensor that can turn off the display panel 1061 and/or the backlight when the terminal device 700 is moved to the ear. As one type of motion sensor, an accelerometer sensor can detect the magnitude of acceleration in multiple directions (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the terminal device posture (such as horizontal and vertical screen switching, associated games, magnetometer posture calibration), vibration identification associated functions (such as pedometer, tapping), and the like; the sensors 105 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., which are not described in detail herein.

The display unit 106 is used to display information input by a user or information provided to the user. The Display unit 106 may include a Display panel 1061, and the Display panel 1061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 107 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the terminal device. Specifically, the user input unit 107 includes a touch panel 1071 and other input devices 1072. Touch panel 1071, also referred to as a touch screen, may collect touch operations by a user on or near the touch panel 1071 (e.g., operations by a user on or near touch panel 1071 using a finger, stylus, or any suitable object or attachment). The touch panel 1071 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 110, and receives and executes commands sent by the processor 110. In addition, the touch panel 1071 may be implemented in various types, such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 1071, the user input unit 107 may include other input devices 1072. Specifically, other input devices 1072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein.

Further, the touch panel 1071 may be overlaid on the display panel 1061, and when the touch panel 1071 detects a touch operation thereon or nearby, the touch panel 1071 transmits the touch operation to the processor 110 to determine the type of the touch event, and then the processor 110 provides a corresponding visual output on the display panel 1061 according to the type of the touch event. Although in fig. 8, the touch panel 1071 and the display panel 1061 are two independent components to implement the input and output functions of the terminal device, in some embodiments, the touch panel 1071 and the display panel 1061 may be integrated to implement the input and output functions of the terminal device, and is not limited herein.

The interface unit 108 is an interface for connecting an external device to the terminal apparatus 700. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 108 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the terminal apparatus 700 or may be used to transmit data between the terminal apparatus 700 and the external device.

The memory 109 may be used to store software programs as well as various data. The memory 109 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 109 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 110 is a control center of the terminal device, connects various parts of the entire terminal device using various interfaces and lines, and performs various functions of the terminal device and processes data by running or executing software programs and/or modules stored in the memory 109 and calling data stored in the memory 109, thereby performing overall monitoring of the terminal device. Processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 110.

The terminal device 700 may further include a power supply 111 (such as a battery) for supplying power to the plurality of components, and preferably, the power supply 111 may be logically connected to the processor 110 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system.

In addition, the terminal device 700 includes some functional modules that are not shown, and are not described in detail herein.

Example III,

An embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements multiple processes of the random access method shown in the first embodiment, and can achieve the same technical effect, and in order to avoid repetition, the computer program is not described herein again. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present application or portions thereof contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (e.g., a mobile phone, a computer, a server, an air conditioner, or a network-side device) to execute the method according to the embodiments of the present application.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A random access method is applied to a terminal device, and the method comprises the following steps:

under the condition that it is determined that there is no synchronization information block SSB satisfying a first preset condition and no channel state information reference signal CSI-RS satisfying a second preset condition in a first cell, selecting the first SSB in the SSB of the first cell or selecting the first CSI-RS in a target CSI-RS set, where the first cell is a cell where the terminal device initiates random access, and the first preset condition is: the SSB signal quality is greater than the SSB signal quality threshold, and the second preset condition is: configuring associated non-contention random access CFRA resources and enabling the CSI-RS signal quality to be larger than a CSI-RS signal quality threshold value;

under the condition that the first SSB is selected and the first SSB is configured with associated CFRA resources, selecting a first preamble in a first preamble set, and sending the first preamble on a Physical Random Access Channel (PRACH) time-frequency resource corresponding to the first SSB, wherein the first preamble set comprises preambles corresponding to the CFRA resources associated with the first SSB;

2. The method of claim 1, wherein the first set of preambles is a set of preambles consisting of a preamble corresponding to a CFRA resource associated with the first SSB and a preamble corresponding to a contention random access (CBRA) resource associated with the first SSB.

3. The method of claim 1, wherein the first set of preambles is a set of preambles formed from preambles corresponding to CFRA resources associated with the first SSB.

4. The method of claim 1, wherein the second set of preambles is a set of preambles consisting of a preamble corresponding to a CFRA resource associated with the first CSI-RS and a preamble corresponding to a CBRA resource associated with the first CSI-RS.

5. The method of claim 1, wherein the second set of preambles is a set of preambles formed from preambles corresponding to CFRA resources associated with the first CSI-RS.

6. The method of claim 1, wherein the target CSI-RS set is a CSI-RS set of CSI-RSs configured with associated CFRA resources.

7. The method of claim 1, wherein the target CSI-RS set configures a CSI-RS set formed by all CSI-RSs for the terminal device.

8. The method according to any one of claims 1-7, further comprising:

receiving configuration information sent by a network side device, wherein the configuration information comprises: the SSB signal quality threshold, SSBs in which associated CFRA resources are configured, and CFRA resources associated with each of the SSBs in which associated CFRA resources are configured;

measuring signal quality of all SSBs in the first cell;

if the signal quality of all the SSBs in the first cell is determined to be less than or equal to the SSB signal quality threshold, determining that no SSB meeting a first preset condition exists in the first cell and no CSI-RS meeting a second preset condition exists in the first cell.

9. The method according to any one of claims 1-7, further comprising:

receiving configuration information sent by a network side device, wherein the configuration information comprises: the SSB signal quality threshold, the CSI-RS signal quality threshold, CSI-RSs with associated CFRA resources configured, and CFRA resources associated with each of the CSI-RSs with associated CFRA resources configured;

measuring signal quality of each CSI-RS configured with the associated CFRA resource and signal quality of all SSBs in the first cell;

and if the signal quality of each CSI-RS configured with the associated CFRA resource is determined to be less than or equal to the CSI-RS signal quality threshold, and the signal quality of all SSBs in the first cell is determined to be less than or equal to the SSB signal quality threshold, determining that no SSB meeting a first preset condition exists in the first cell, and no CSI-RS meeting a second preset condition exists in the first cell.

10. The method according to any one of claims 1-7, further comprising:

receiving configuration information sent by a network side device, wherein the configuration information comprises: the SSB signal quality threshold, the SSBs in which the associated CFRA resources are configured, the CFRA resources associated with each of the SSBs in which the associated CFRA resources are configured, the CSI-RS signal quality threshold, the CSI-RSs in which the associated CFRA resources are configured, and the CFRA resources associated with each of the CSI-RSs in which the associated CFRA resources are configured;

11. A terminal device, comprising:

a processing unit, configured to select a first synchronization information block SSB in a first cell or a first CSI-RS in a target CSI-RS set when it is determined that there is no SSB in the first cell that meets a first preset condition and there is no CSI-RS in a CSI-RS set that meets a second preset condition, where the first cell is a cell in which the terminal device initiates random access, and the first preset condition is: the SSB signal quality is greater than the SSB signal quality threshold, and the second preset condition is: configuring associated non-contention random access CFRA resources and enabling the CSI-RS signal quality to be larger than a CSI-RS signal quality threshold value;

a sending unit, configured to send the first preamble selected by the processing unit on a PRACH time-frequency resource of a physical random access channel corresponding to the first SSB, where the first preamble set includes preambles corresponding to CFRA resources associated with the first SSB;

12. The terminal device of claim 11, wherein the first set of preambles is a set of preambles consisting of a preamble corresponding to a CFRA resource associated with the first SSB and a preamble corresponding to a contention random access, CBRA, resource associated with the first SSB.

13. The terminal device of claim 11, wherein the first set of preambles is a set of preambles formed from preambles corresponding to CFRA resources associated with the first SSB.

14. The terminal device of claim 11, wherein the second set of preambles is a set of preambles consisting of a preamble corresponding to a CFRA resource associated with the first CSI-RS and a preamble corresponding to a CBRA resource associated with the first CSI-RS.

15. The terminal device of claim 11, wherein the second set of preambles is a set of preambles formed from preambles corresponding to CFRA resources associated with the first CSI-RS.

16. The terminal device of claim 11, wherein the target CSI-RS set is a CSI-RS set formed by CSI-RSs configured with associated CFRA resources.

17. The terminal device of claim 11, wherein the target CSI-RS set configures a CSI-RS set formed by all CSI-RSs for the terminal device.

18. The terminal device according to any of claims 11-17, wherein the terminal device further comprises:

a receiving unit, configured to receive configuration information sent by a network side device, where the configuration information includes: the SSB signal quality threshold, SSBs in which associated CFRA resources are configured, and CFRA resources associated with each of the SSBs in which associated CFRA resources are configured;

a measuring unit, configured to measure signal quality of all SSBs in the first cell;

the processing unit is specifically configured to determine that there is no SSB satisfying a first preset condition and no CSI-RS satisfying a second preset condition in the first cell when it is determined that the signal quality of all SSBs in the first cell is less than or equal to the SSB signal quality threshold.

19. The terminal device according to any of claims 11-17, wherein the terminal device further comprises:

a receiving unit, configured to receive configuration information sent by a network side device, where the configuration information includes: the SSB signal quality threshold, the CSI-RS signal quality threshold, CSI-RSs with associated CFRA resources configured, and CFRA resources associated with each of the CSI-RSs with associated CFRA resources configured;

a measuring unit, configured to measure signal quality of each CSI-RS configured with the associated CFRA resource and signal quality of all SSBs in the first cell;

the processing unit is specifically configured to determine that there is no SSB in the first cell that satisfies a first preset condition and there is no CSI-RS that satisfies a second preset condition when it is determined that the signal quality of each CSI-RS configured with the associated CFRA resource is less than or equal to the CSI-RS signal quality threshold and the signal quality of all SSBs in the first cell is less than or equal to the SSB signal quality threshold.

20. The terminal device according to any of claims 11-17, wherein the terminal device further comprises:

a receiving unit, configured to receive configuration information sent by a network side device, where the configuration information includes: the SSB signal quality threshold, the SSBs in which the associated CFRA resources are configured, the CFRA resources associated with each of the SSBs in which the associated CFRA resources are configured, the CSI-RS signal quality threshold, the CSI-RSs in which the associated CFRA resources are configured, and the CFRA resources associated with each of the CSI-RSs in which the associated CFRA resources are configured;

21. A terminal device, comprising: processor, memory and a computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the random access method according to any one of claims 1 to 10.

22. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the random access method according to any one of claims 1 to 10.