CN109495977A

CN109495977A - A kind of accidental access method and equipment

Info

Publication number: CN109495977A
Application number: CN201810350172.XA
Authority: CN
Inventors: 庞高昆; 方平; 程勇; 李小仙
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-09-11
Filing date: 2018-04-18
Publication date: 2019-03-19

Abstract

The application provides a kind of accidental access method and equipment, this method comprises: user equipment receives the random access configuration information that the network equipment is sent, random access configuration information includes the corresponding BI adjusting parameter of at least one random access procedure situation and/or power parameter, user equipment is when executing the first random access procedure situation, according to the BI received and the corresponding first BI adjusting parameter of the first random access procedure situation and/or the first power parameter, arbitrary access front signal, which is sent, to the network equipment carries out random access, the network equipment executes different random access procedures for user equipment and configures different random access configuration informations, random access can be made a concentrated effort to finish, the interference to network is reduced simultaneously.

Description

Random access method and equipment

Technical Field

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

Background

In a conventional Long Term Evolution (LTE), i.e., 4G (4th Generation) mobile communication system, a ue initial access system includes three important steps (1) initial synchronization and cell search process; (2) the network sends basic system information; (3) and (4) a random access process. In step (1), the user equipment may obtain downlink coarse time Synchronization and coarse frequency Synchronization according to a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), further obtain symbol Synchronization and frame Synchronization, and obtain information such as a cyclic prefix and a cell ID, and in step (2), the system sends a basic system message, that is, a System Information Block (SIB) message, and the user equipment may obtain an uplink network configuration message by receiving the basic system message (SIB message) and reading the basic system message, and provide related information for the random access process in step (3); in the step (3), the user equipment obtains the uplink random access resource configuration information according to the basic system information provided by the system, and performs the uplink random access process. According to the final conclusion reached by 3GPP, in the uplink Random Access process, the contention-based Random Access process still adopts a method similar to that of the conventional LTE system to send four messages, that is, the user equipment sends a Preamble sequence (Preamble), the network equipment feeds back a Random Access Response (RAR), the user equipment sends a Message 3 Message, and the network equipment replies a Message 4 to perform contention resolution, thereby completing the final uplink Random Access process;

fig. 1 is a schematic flow diagram of a contention-based random access scheme in LTE, where as shown in fig. 1, in the random access scheme, a UE sends a random access preamble (random access preamble) to a base station, and tells the base station (eNodeB, eNB) that there is a request for random access, so that the eNB can estimate a transmission delay with the UE and calibrate uplink Timing (TA) accordingly. After the UE sends the preamble, the UE monitors the PDCCH within a time window of random access feedback so as to receive the RAR message replied by the eNB. Since the resource where the preamble is located may be used by multiple UEs, in order to distinguish different UEs, next, each UE sends a third message in the RA procedure, where the information includes the unique identifier of the UE, that is, the unique identifiers of the UEs are different. Finally, the eNB informs which UE or UEs contend for the channel successfully by replying to the unique identifier of the UE in a third message in a Physical Random Access Channel (PRACH) process. In LTE, 5g NR, and other wireless communication systems, User Equipment (UE) needs to enter an RRC connected state from a Radio Resource Control (RRC) idle state (or inactive state) through random access to establish various bearers with a base station, acquire some necessary resources and parameter configurations, and then communicate with the base station.

However, in the current random access procedure, there is no specific implementation scheme and standard in the prior art, which does not relate to the access situation and the transmission using multiple beams, and how the user equipment performs the backoff technique in the NR system.

Disclosure of Invention

The application provides a random access method and equipment, and provides a backoff technology of user equipment in an NR system.

In a first aspect, the present application provides a random access method, including:

the user equipment receives random access configuration information sent by the network equipment; the random access configuration information comprises BI adjustment parameters and/or power parameters corresponding to at least one random access process condition;

and when the user equipment executes a first random access process condition, sending a random access preamble signal to the network equipment for random access according to the received BI and a first BI adjustment parameter and/or a first power parameter corresponding to the first random access process condition.

In one specific implementation, the power parameter includes a power adjustment parameter or a power ramp step size, and the power adjustment parameter or the power ramp step size is used for increasing the transmission power.

In one implementation, the method further comprises:

the user equipment receives a random access response message returned by the network equipment;

and under the condition that the reception of the random access response message is considered to be failed or under the condition that the conflict resolution is considered to be failed, the user equipment sends a random access preamble signal to the network equipment again for random access according to the received BI and a first BI adjustment parameter and/or a first power parameter corresponding to the first random access process condition.

In a specific implementation, the sending a random access preamble to the network device for performing random access according to the received BI and the first BI adjustment parameter and/or the first power parameter corresponding to the first random access procedure condition includes:

the user equipment sets a backoff parameter according to the received BI and the first BI adjustment parameter, selects a backoff time according to the backoff parameter, and sends a random access preamble signal to the network equipment for random access after waiting for the backoff time;

or,

the user equipment increases the transmitting power according to the first power parameter and sends a random access preamble signal to the network equipment for random access according to the increased transmitting power;

or,

and the user equipment sets a backoff parameter according to the received BI and the first BI adjustment parameter, selects backoff time according to the backoff parameter, increases the transmission power according to the first power parameter, and sends a random access preamble signal to the network equipment for random access according to the increased transmission power after waiting for the backoff time.

In one particular implementation, increasing the transmit power according to a first power parameter includes:

increasing the transmit power according to the recorded (or received) power ramp step size and the first BI adjustment parameter;

or,

and increasing the transmitting power according to the first power climbing step length.

In one implementation, the method further comprises:

when the user equipment executes a second random access process condition and the random access configuration information does not include a BI adjustment parameter and/or a power parameter corresponding to the second random access process condition, the user equipment sets a backoff parameter according to the received BI, selects a backoff time based on the backoff parameter, and sends a random access preamble signal to the network equipment for random access after the backoff time and/or according to the transmission power after the received (or pre-stored) power ramp step length is increased.

In a second aspect, the present application provides a random access method, including:

the user equipment receives random access configuration information sent by the network equipment; the random access configuration information comprises BI adjustment parameters and/or power parameters corresponding to at least two random access process conditions;

when the user equipment changes from executing a second random access process condition to executing a first random access process condition, sending a random access preamble signal to the network equipment for random access according to the received BI and a first BI adjustment parameter and/or a first power parameter corresponding to the first random access process condition; or sending a random access preamble signal to the network equipment for random access according to the received BI and the power ramp-up step.

In a specific implementation manner, the sending a random access preamble signal to the network device for random access according to the received BI and the power ramp-up step includes:

the user equipment sets a backoff parameter according to the received BI, selects a backoff time according to the backoff parameter, and sends a random access preamble signal to the network equipment for random access after waiting for the backoff time;

or,

the user equipment increases the transmitting power according to the received power climbing step length and sends a random access preamble signal to the network equipment for random access according to the increased transmitting power;

or,

and the user equipment sets a backoff parameter according to the received BI, selects backoff time according to the backoff parameter, increases the transmission power according to the received power ramp step length, and sends a random access preamble signal to the network equipment for random access according to the increased transmission power after waiting for the backoff time.

In a specific implementation, the BI is a BI recorded when the second random access procedure case is performed.

In a third aspect, the present application provides a random access method, including:

the network equipment configures corresponding BI adjustment parameters and/or power parameters for different random access process conditions;

the network equipment sends random access configuration information, wherein the random access configuration information comprises at least one BI adjustment parameter and/or power parameter corresponding to a random access process condition.

In a specific implementation manner, the power parameter includes a power adjustment parameter or a power ramp step size, and the power adjustment parameter or the power ramp step size is used for increasing the transmission power.

In a specific implementation manner, the network device configures a second BI adjustment parameter and/or a second power parameter for the case that the user equipment performs a second random access procedure, where the second power parameter includes the second power adjustment parameter or a second power ramp step.

In a specific implementation of the scheme, the second random access procedure condition is different from the first random access procedure condition, and the first BI adjustment parameter is different from the second BI adjustment parameter; the second power adjustment parameter is different from the first power adjustment parameter; the second power ramp step length is different from the first power ramp step length.

In a fourth aspect, the present application provides a random access method, including:

the user equipment selects a first SSB sent by the network equipment and sends a random access preamble signal to the network equipment;

the user equipment receives a random access response returned by the network equipment; the random access response comprises a first backoff indication BI and/or a first power ramp step corresponding to the first SSB;

and under the condition that the random access response message reception is considered to be failed or the conflict resolution is considered to be failed, the user equipment sends a random access preamble signal to the network equipment again for random access according to the first backoff indication BI and/or the first power ramp step.

In a specific implementation manner, the selecting, by the user equipment, a preconfigured first synchronization signal block SSB to send a random access preamble to the network equipment includes:

and the user equipment sends the random access preamble signal to the network equipment by using the PRACH resource corresponding to the first SSB.

In a specific implementation manner, the sending, by the user equipment, a random access preamble to the network equipment again according to the first backoff indicator BI and/or the first power ramp step for performing random access includes:

the user equipment selects a back-off time based on the BI, and sends a random access preamble signal to the network equipment again for random access after waiting for the back-off time;

or,

the user equipment increases the transmitting power based on the first power climbing step length, and sends a random access preamble signal to the network equipment again for random access according to the increased transmitting power;

or,

and the user equipment selects backoff time based on the BI, increases the transmission power based on the first power ramp step length, and sends a random access preamble signal to the network equipment again for random access according to the increased transmission power after waiting for the backoff time.

In a specific implementation, the method further includes:

the user equipment selects a second SSB to send a random access preamble signal to the network equipment;

the user equipment receives a random access response returned by the network equipment; the random access response comprises a second BI and/or a second power ramp step corresponding to the second SSB;

and under the condition that the random access response message reception is considered to be failed or the conflict resolution is considered to be failed, the user equipment sends a random access preamble signal to the network equipment again according to the second BI and/or the second power ramp-up step for random access.

In one specific implementation, the selecting, by the user equipment, the second SSB to send the random access preamble to the network equipment includes:

and the user equipment selects the PRACH resource corresponding to the second SSB to send a random access preamble signal to the network equipment.

In one specific implementation, the network device uses a first transmission beam to correspond to the first SSB, and the network device uses a second transmission beam to correspond to the second SSB.

Optionally, the number of user equipments covered by the first transmission beam is different from the number of users covered by the second transmission beam.

In a fifth aspect, the present application provides a random access method, including:

the network equipment receives a random access preamble signal sent by user equipment, and recognizes that the user equipment selects a first SSB;

the network equipment returns a random access response to the user equipment; the random access response includes a first backoff indication BI and/or a first power ramp step corresponding to the first SSB.

In one specific implementation, the receiving, by the network device, a random access preamble signal sent by a user equipment through a first synchronization signal block SSB includes:

and the network equipment receives the random access preamble signal sent by the user equipment through the PRACH resource corresponding to the first SSB.

In one implementation, the method further comprises:

the network equipment receives a random access preamble signal sent by user equipment, and identifies that the user equipment selects a second SSB;

the network equipment returns a random access response to the user equipment according to the random access preamble signal; the random access response comprises a second BI and/or a second power ramp step corresponding to the second SSB.

In a specific implementation, the network device receives the random access preamble signal sent by the user equipment through the PRACH resource corresponding to the second SSB.

In one specific implementation, the network device uses a first transmission beam to correspond to the first SSB.

Optionally, the network device uses a second transmission beam corresponding to the second SSB.

In a sixth aspect, the present application provides a random access method, including:

the user equipment sends a random access preamble signal to the network equipment by using a first transmission beam and/or a first random access resource, wherein the random access preamble signal is used for initiating a random access process;

the user equipment receives a backoff indicator BI sent by the network equipment;

the user equipment sets a backoff parameter according to the BI;

the user equipment performs any one of the following schemes in case random access response message reception is considered to fail or in case collision resolution is considered to fail: wherein,

scheme A: if the beam currently used by the user equipment is the first transmission beam, or the user equipment currently uses a first random access resource, or if a power ramp counter of the user equipment is changed after random access response message reception is considered to be failed or conflict resolution is considered to be failed, or if the transmission power of the user equipment reaches a maximum value, the first user equipment selects a random back-off time based on the back-off parameter, and after waiting for the random back-off time, the user equipment initiates a random access process to the network equipment again;

scheme B: if the beam currently used by the user equipment is a second transmission beam, or the user equipment currently uses a second random access resource, or if the power ramp counter of the user equipment is not changed after the random access response message reception is considered to be failed or the conflict resolution is considered to be failed, or if the power ramp counter of the user equipment is reset, the user equipment sets the backoff parameter to 0;

scheme C: if the transmission power of the user equipment reaches the maximum value and the beam currently used by the user equipment is a second transmission beam, the user equipment selects a random back-off time based on the back-off parameter, and after waiting for the random back-off time, the user equipment initiates a random access process to the network equipment again;

scheme D: if the power ramp counter of the user equipment is changed after the random access response message reception is considered to be failed or the conflict resolution is considered to be failed and the beam currently used by the user equipment is the first transmission beam, or if the power ramp counter of the user equipment is changed after the random access response message reception is considered to be failed or the conflict resolution is considered to be failed and the beam currently used by the user equipment is the second transmission beam, the user equipment selects a random back-off time based on the back-off parameter, and after waiting for the random back-off time, the user equipment initiates a random access process to the network equipment again;

scheme E: if the power ramp counter of the user equipment is not changed after the random access response message reception is considered to be failed or the conflict resolution is considered to be failed and the beam currently used by the user equipment is a second transmission beam, the user equipment sets the backoff parameter to 0;

scheme F: if the power ramp counter of the user equipment is reset and the beam currently used by the user equipment is a second transmission beam, the user equipment sets the backoff parameter to 0;

scheme G: if the beam currently used by the user equipment is a second transmission beam and the second transmission beam is a transmission beam used by the user equipment before, the user equipment selects a random back-off time based on the back-off parameter, and after waiting for the random back-off time, the user equipment initiates a random access process to the network equipment again;

scheme H: the user equipment maintains a counter for the first transmission beam, the user equipment sends a pilot once by using the first transmission beam, the counter is increased by 1, and the first user equipment sets the backoff parameter to 0 when the user equipment judges that the counter does not reach the maximum value;

scheme I: the user equipment maintains a counter for the first transmission beam, and when the user equipment judges that the counter reaches the maximum value, the user equipment selects a random back-off time based on the back-off parameter, and after waiting for the random back-off time, the user equipment initiates a random access process to the network equipment again.

In a specific implementation manner, if the beam currently used by the ue is a first transmission beam, or the ue currently uses a first random access resource, the method further includes:

the beam used by the user equipment after the random access response message reception is considered to be failed or the collision resolution is considered to be failed is the first transmission beam;

the user equipment uses the random access resource as the first random access resource after the random access response message reception is considered to be failed or the conflict resolution is considered to be failed.

Optionally, the beam currently used by the ue is a second transmission beam, or the ue currently uses a second random access resource, then the method further includes:

the beam used by the user equipment after the random access response message reception is considered to be failed or the collision resolution is considered to be failed is the second transmission beam;

the user equipment uses the random access resource as the second random access resource after the random access response message reception is considered to be failed or the conflict resolution is considered to be failed.

Optionally, if the transmission power of the ue reaches the maximum value, the transmission power of the first ue reaches the maximum value after the random access response message reception is considered to fail or the collision resolution is considered to fail.

Optionally, the power ramp counter of the first user equipment is reset, and then the power ramp counter of the user equipment is reset after the random access response message reception is considered to fail or the conflict resolution is considered to fail.

In a seventh aspect, the present application provides a user equipment, including: the device comprises a receiving module, a processing module and a sending module;

the receiving module is used for receiving random access configuration information sent by network equipment; the random access configuration information comprises a backoff indication BI adjustment parameter and/or a power parameter corresponding to at least one random access process condition;

the sending module is configured to send a random access preamble signal to the network device for random access according to the received backoff indicator BI and a first BI adjustment parameter and/or a first power parameter corresponding to the first random access procedure condition when the processing module executes the first random access procedure condition.

Optionally, the power parameter includes a power adjustment parameter or a power ramp step size, and the power adjustment parameter or the power ramp step size is used to increase the transmission power.

Optionally, the receiving module is further configured to receive a random access response message returned by the network device;

and if the reception of the random access response message is deemed to be failed or if the collision resolution is deemed to be failed, the processing module is further configured to send a random access preamble signal to the network device again for random access through the sending module according to the received backoff indication BI and the first BI adjustment parameter and/or the first power parameter corresponding to the first random access process condition.

Optionally, the processing module is specifically configured to:

setting a backoff parameter according to the received BI and the first BI adjustment parameter, selecting a backoff time according to the backoff parameter, and after waiting for the backoff time, sending a random access preamble signal to the network equipment through the sending module for random access;

or,

increasing the transmitting power according to the first power parameter, and transmitting a random access preamble signal to the network equipment through the transmitting module according to the increased transmitting power for random access;

or,

setting a backoff parameter according to the received BI and the first BI adjustment parameter, selecting a backoff time according to the backoff parameter, increasing the transmission power according to the first power parameter, and sending a random access preamble signal to the network equipment for random access through the sending module according to the increased transmission power after waiting for the backoff time.

Optionally, when the user equipment executes a second random access process condition and the random access configuration information does not include a BI adjustment parameter and/or a power parameter corresponding to the second random access process condition, the processing module is further configured to set a backoff parameter according to the received BI, select a backoff time based on the backoff parameter, and send a random access preamble to the network equipment through the sending module for random access after the backoff time and/or according to the received transmission power after the power ramp-up step is increased.

In an eighth aspect, the present application provides a user equipment, comprising: the device comprises a receiving module, a processing module and a sending module;

the receiving module is used for receiving random access configuration information sent by network equipment; the random access configuration information comprises backoff indication BI adjustment parameters and/or power parameters corresponding to at least two random access process conditions;

when the user equipment changes from executing a second random access process condition to executing a first random access process condition, the processing module sends a random access preamble signal to the network equipment for random access through the sending module according to the received backoff indication BI and a first BI adjustment parameter and/or a first power parameter corresponding to the first random access process condition; or, the processing module sends a random access preamble signal to the network device through the sending module according to the received BI and the power ramp step length to perform random access.

Optionally, the processing module is specifically configured to:

setting a backoff parameter according to the received BI, selecting a backoff time according to the backoff parameter, and after waiting for the backoff time, sending a random access preamble signal to the network equipment through the sending module for random access;

or,

increasing the transmitting power according to the received power climbing step length, and transmitting a random access preamble signal to the network equipment through the transmitting module according to the increased transmitting power for random access;

or,

setting a backoff parameter according to the received BI, selecting a backoff time according to the backoff parameter, increasing the transmission power according to the received power ramp step length, and sending a random access preamble signal to the network equipment for random access through the sending module according to the increased transmission power after waiting for the backoff time.

In a ninth aspect, the present application provides a network device, comprising:

the processing module is used for configuring corresponding backoff indication BI adjustment parameters and/or power parameters aiming at different random access process conditions;

a sending module, configured to send random access configuration information, where the random access configuration information includes at least one backoff indicator BI adjustment parameter and/or power parameter corresponding to a random access procedure condition.

In a tenth aspect, the present application provides a user equipment, comprising:

a sending module, configured to select a first SSB sent by a network device, and send a random access preamble signal to the network device;

a receiving module, configured to receive a random access response returned by the network device; the random access response comprises a first backoff indication BI and/or a first power ramp step corresponding to the first SSB;

and the processing module is used for sending a random access preamble signal to the network equipment again for random access through the sending module according to the first BI and/or the first power ramp step length under the condition that the reception of the random access response message is considered to be failed or the conflict resolution is considered to be failed.

Optionally, the sending module is specifically configured to send the random access preamble signal to the network device by using the PRACH resource corresponding to the first SSB.

Optionally, the processing module is specifically configured to:

selecting a back-off time based on the BI, and after waiting for the back-off time, sending a random access preamble signal to the network equipment again through the sending module for random access;

or,

increasing the transmitting power based on the first power climbing step length, and sending a random access preamble signal to the network equipment again through the sending module according to the increased transmitting power for random access;

or,

and selecting backoff time based on the BI, increasing the transmission power based on the first power ramp step length, and sending a random access preamble signal to the network equipment again for random access through the sending module according to the increased transmission power after waiting for the backoff time.

In an eleventh aspect, the present application provides a network device, comprising:

a receiving module, configured to receive a random access preamble signal sent by a user equipment, and recognize that the user equipment selects a first SSB;

a sending module, configured to return a random access response to the user equipment according to the random access preamble; the random access response includes a first backoff indication BI and/or a first power ramp step corresponding to the first SSB.

Optionally, the receiving module is specifically configured to receive the random access preamble signal sent by the user equipment through the PRACH resource corresponding to the first SSB.

In a twelfth aspect, the present application provides a user equipment, the method including: a receiver, a processor, a transmitter, and a memory for storing a computer program;

the receiver is used for receiving random access configuration information sent by network equipment; the random access configuration information comprises a backoff indication BI adjustment parameter and/or a power parameter corresponding to at least one random access process condition;

the transmitter is configured to send a random access preamble signal to the network device for random access according to the received BI and a first BI adjustment parameter and/or a first power parameter corresponding to a first random access procedure condition when the processor executes the first random access procedure condition.

Optionally, the receiver is further configured to receive a random access response message returned by the network device;

and under the condition that the reception of the random access response message is considered to be failed or under the condition that the conflict resolution is considered to be failed, the processor is further configured to, according to the received backoff indication BI and the first BI adjustment parameter and/or the first power parameter corresponding to the first random access process condition, send a random access preamble signal to the network device again through the transmitter for performing random access.

Optionally, the processor is specifically configured to:

setting a backoff parameter according to the received BI and the first BI adjustment parameter, selecting a backoff time according to the backoff parameter, and after waiting for the backoff time, sending a random access preamble signal to the network equipment through the transmitter for random access;

or,

increasing the transmission power according to the first power parameter, and sending a random access preamble signal to the network equipment through the sender according to the increased transmission power for random access;

or,

setting a backoff parameter according to the received BI and the first BI adjustment parameter, selecting a backoff time according to the backoff parameter, increasing the transmission power according to the first power parameter, and sending a random access preamble signal to the network equipment through the sender for random access according to the increased transmission power after waiting for the backoff time.

Optionally, when the user equipment executes a second random access process condition and the random access configuration information does not include a BI adjustment parameter and/or a power parameter corresponding to the second random access process condition, the processor is further configured to set a backoff parameter according to the received BI, select a backoff time based on the backoff parameter, and send a random access preamble to the network equipment through the sender for random access after the backoff time and/or according to the received transmission power after the power ramp step is increased.

In a thirteenth aspect, the present application provides a user equipment, comprising: a receiver, a processor, a transmitter, and a memory for storing a computer program;

the receiver is used for receiving random access configuration information sent by network equipment; the random access configuration information comprises backoff indication BI adjustment parameters and/or power parameters corresponding to at least two random access process conditions;

when the user equipment changes from executing a second random access process condition to executing a first random access process condition, the processor sends a random access preamble signal to the network equipment for random access through the transmitter according to the received backoff indication BI and a first BI adjustment parameter and/or a first power parameter corresponding to the first random access process condition; or the processor sends a random access preamble signal to the network equipment through the transmitter according to the received BI and the power ramp step length to perform random access.

Optionally, the processor is specifically configured to:

setting a backoff parameter according to the received BI, selecting a backoff time according to the backoff parameter, and after waiting for the backoff time, sending a random access preamble signal to the network equipment through the transmitter for random access;

or,

increasing the transmitting power according to the received power climbing step length, and transmitting a random access preamble signal to the network equipment through the transmitter according to the increased transmitting power for random access;

or,

setting a backoff parameter according to the received BI, selecting a backoff time according to the backoff parameter, increasing the transmission power according to the received power ramp step length, and sending a random access preamble signal to the network equipment through the sender for random access according to the increased transmission power after waiting for the backoff time.

In a fourteenth aspect, the present application provides a network device, comprising: a memory for storing a computer program;

the processor is used for configuring corresponding backoff indication BI adjustment parameters and/or power parameters aiming at different random access process conditions;

a transmitter, configured to transmit random access configuration information, where the random access configuration information includes a backoff indicator BI adjustment parameter and/or a power parameter corresponding to at least one random access procedure condition.

In a fifteenth aspect, the present application provides a user equipment, comprising: a memory for storing a computer program;

a transmitter, configured to select a first SSB sent by a network device to send a random access preamble signal to the network device;

the receiver is used for receiving a random access response returned by the network equipment; the random access response comprises a first backoff indication BI and/or a first power ramp step corresponding to the first SSB;

and a processor, configured to, in a case where reception of the random access response message is deemed to have failed or in a case where collision resolution is deemed to have failed, retransmit a random access preamble to the network device through the transmitter for random access according to the first backoff indicator BI and/or the first power ramp-up step.

Optionally, the transmitter is specifically configured to send the random access preamble signal to the network device using the PRACH resource corresponding to the first SSB.

Optionally, the processor is specifically configured to:

selecting a backoff time based on the BI, and after waiting for the backoff time, sending a random access preamble signal to the network equipment again through the transmitter for random access;

or,

increasing the transmitting power based on the first power climbing step length, and sending a random access preamble signal to the network equipment again through the transmitter according to the increased transmitting power for random access;

or,

and selecting backoff time based on the BI, increasing the transmission power based on the first power ramp step length, and sending a random access preamble signal to the network equipment again through the transmitter for random access according to the increased transmission power after waiting for the backoff time.

In a sixteenth aspect, the present application provides a network device, comprising: a memory for storing a computer program;

a receiver, configured to receive a random access preamble signal sent by a user equipment, and recognize that the user equipment selects a first SSB;

a transmitter, configured to return a random access response to the user equipment; the random access response includes a first backoff indication BI and/or a first power ramp step corresponding to the first SSB.

Optionally, the receiver is specifically configured to receive the random access preamble signal sent by the user equipment through the PRACH resource corresponding to the first SSB.

In a seventeenth aspect, the present application provides a storage medium for storing a computer program for implementing the random access method provided in any one of the first aspect.

In an eighteenth aspect, the present application provides a storage medium for storing a computer program for implementing the random access method provided in any one of the second aspects.

In a nineteenth aspect, the present application provides a storage medium for storing a computer program for implementing the random access method provided in any one of the third aspect.

In a twentieth aspect, the present application provides a storage medium for storing a computer program for implementing the random access method provided in any one of the fourth aspects.

In a twenty-first aspect, the present application provides a storage medium for storing a computer program for implementing the random access method provided in any one of the fifth aspects.

According to the random access method and the random access equipment, the network equipment configures different BI (business intelligence) adjustment parameters and/or power parameters aiming at different conditions of the random access process executed by the user equipment, and when the user executes a certain random access process condition, such as a first random access process condition, a random access preamble signal can be sent to the network equipment to carry out the random access process according to the received BI and a first BI adjustment parameter and/or a first power parameter corresponding to the first random access process condition, namely the user equipment can select to use the corresponding BI adjustment parameter to adjust the backoff parameter and the transmission power according to different random access process conditions, so that the random access can be accelerated, and the interference to the network can be reduced.

Drawings

Fig. 1 is a schematic flow diagram of a contention-based random access scheme in LTE;

fig. 2 is a schematic diagram of a wireless communication system architecture provided in the present application;

fig. 3 is a schematic connection diagram of a network device and a user equipment provided in the present application;

fig. 4 is a schematic structural diagram of a user equipment provided in the present application;

fig. 5 is a schematic structural diagram of a network device provided in the present application;

fig. 6 is a flowchart of a first embodiment of a random access method provided in the present application;

fig. 7 is a flowchart of a second embodiment of a random access method provided in the present application;

fig. 8 is a flowchart of a third embodiment of a random access method provided in the present application;

fig. 9 is a schematic structural diagram of a first embodiment of a user equipment provided in the present application;

fig. 10 is a schematic structural diagram of a first embodiment of a network device provided in the present application;

fig. 11 is a schematic structural diagram of a second embodiment of a user equipment provided in the present application;

fig. 12 is a schematic structural diagram of a second network device according to an embodiment of the present application.

Detailed Description

The random access scheme provided by the application can be applied to a wireless communication system, such as a New Radio (NR) scene, a Long Term Evolution (LTE) next generation scene, a Wireless Local Area Network (WLAN) scene, a bluetooth communication scene, and the like. For convenience of description, the embodiment of the present application takes a new air interface scenario as an example for explanation. Fig. 2 is a schematic diagram of a wireless communication system architecture provided in this application, and as shown in fig. 2, in an NR scenario, a Core network with a New air interface, such as a New Radio access technology Core (NR _ New rat-Core) and an access network with a New air interface, where functional entities are mainly network devices and a user equipment connected to the network device in the access network with a New air interface, such as the user equipment 1 shown in fig. 2, and may further include a relay device and a user equipment connected to the relay, such as the user equipment 2 shown in fig. 2. The relay device establishes a connection with the network device through the link 2, and thus, the relay device can also be regarded as a user equipment with respect to the network device; the relay device establishes a connection with the user equipment 2 via the link 3, and thus the relay device can also be considered as a kind of network device with respect to the user equipment. Therefore, those skilled in the art can understand that the network device described in the present invention may also include a relay device, and the user equipment described in the present invention may also include a relay device. The network device may specifically be any one or a combination of several of a gNB, a New radio base station (New radio eNB), a transmission point (TRP), a macro base station, a micro base station, a high frequency base station, an LTE macro or micro eNB, a CPE, a WLAN AP, a WLAN GO, and the like, for example, the network device may be a gNB, and the gNB completes functions related to the network device in the present invention, or the network device is a combination of the gNB and the TRP, for example, the gNB completes a resource configuration function of the network device in the present invention, and the TRP completes a sending and receiving function of the network device in the present invention, which is not limited in this respect. The user equipment may be a mobile phone, a tablet, an intelligent vehicle, a sensing device, an Internet of Things (IOT) device, a Customer Premises Equipment (CPE), a relay base station, and the like.

Fig. 3 is a schematic connection diagram of a network device and a user equipment provided in the present application, as shown in fig. 3, the network device may form a plurality of transmission beams or reception beams by using a Beamforming technology, such as Digital Beamforming or Analog Beamforming, angles covered by the beams may be the same or different, and beams with different coverage angles may have overlapping portions, for example, the network device may transmit control information by using a beam with a wider coverage angle and transmit data information by using a beam with a narrower coverage angle. The user equipment may receive information transmitted by the network device within the coverage area of one or more beams or sets or groups of beams therein. The ue may also form multiple receive beams by Beamforming, and determine to use one or more receive beams for reception corresponding to the downlink beams used by the network device. For convenience of description, the beams referred to in the embodiments of the present invention may refer to a single or a plurality of beams.

Accordingly, a downlink transmission Beam of a network device and a corresponding reception Beam of a user device, or an uplink transmission Beam of a user device and a corresponding reception Beam of a network device, may be referred to as a Pair of Beam pairs, beampair Link (BPL), and a transmission Link formed by the beampair Pair. For example, when the network device in fig. 3 uses beam 3 as a downlink transmission beam, the user equipment may determine to use beam 6 as the corresponding reception beam, with beam 3 forming a pair of BPLs with beam 6. When a beam of the network device or the user equipment conforms to a beam correspondence (beamcorepressor) characteristic, a corresponding receive beam or transmit beam may be determined from the transmit beam or receive beam.

The present application relates to a user equipment and a network device, and the user equipment refers to, for example, a 5G UE (UE supporting a next generation mobile communication standard), or other 5G terminal equipment. Fig. 4 is a schematic structural diagram of a user equipment provided in the present application, and as illustrated in fig. 4, the user equipment 100 may include: one or more transceivers 101, one or more antennas 104, one or more processors 102, and one or more memories 103. The user equipment may be capable of performing the method performed by the first user equipment in any of the embodiments provided herein.

The network device refers to, for example, a 5G gbb (base station in a next generation mobile communication network), or a Transmission and Reception Point (TRP), or other network devices of a 5G access network (e.g., a micro base station). Fig. 5 is a schematic structural diagram of a network device provided in the present application, and as an example in fig. 5, the network device 200 may include: one or more transceivers 201, one or more antennas 204, one or more processors 202, one or more memories 203, and further, may include one or more other interfaces 205 (e.g., fiber link interfaces, ethernet interfaces, and/or copper wire interfaces, etc.). The network device can execute the method executed by the network device in any embodiment provided by the application.

In the embodiment of the present application, a beam may also be referred to as beam, and the beam may be directly replaced by beam, or the beam may be directly replaced by beam, which is not described herein again;

optionally, the beam may also be referred to as a direction, and the beam may be directly replaced by the direction, or the direction may be directly replaced by the beam, for example, the first beam may be replaced by the first direction, and the first direction may be replaced by the first beam, which is not described herein again;

optionally, the beam may also be referred to as a spatial resource, and the beam may be directly replaced with the spatial resource, or the spatial resource may be directly replaced with the beam, which is not described herein again;

optionally, the beam may also be referred to as a precoding vector, and the beam may be directly replaced with the precoding vector, or the precoding vector may be directly replaced with the beam, which is not described herein again;

the network device may also be referred to as a gNB, and the network device may be directly replaced by the gNB, or the gNB may be directly replaced by the network device, which is not described herein again;

optionally, the network device may also be referred to as a TRP, and the network device may be directly replaced with the TRP, or the TRP may be directly replaced with the network device, which is not described herein again;

optionally, the identification information of the beam may also be referred to as index information of the beam, and the identification information of the beam may be directly replaced with the index information of the beam, or the index information of the beam may be directly replaced with the identification information of the beam, which is not described herein again.

The identification information of the beam may also be referred to as beam identification information, and the identification information of the beam may be directly replaced by the beam identification information, or the beam identification information may be directly replaced by the identification information of the beam, which is not described herein again.

Alternatively, the beam/beam may be understood as a spatial resource, and may refer to a transmission or reception precoding vector having energy transmission directivity/directivity. And, the transmission or reception precoding vector can be identified by index information. The energy transmission directivity may refer to that, in a certain spatial position, a signal subjected to precoding processing by the precoding vector is received with good reception power, such as meeting a reception demodulation signal-to-noise ratio; the energy transmission directivity may also refer to that the same signal sent from different spatial locations is received by the precoding vector and has different received powers, which may be understood as that different beams are used by the device to indicate that the device uses different spatial resources, optionally, uplink spatial resources and/or downlink spatial resources are further distinguished, or spatial resources used for sending information and spatial resources used for receiving information are further distinguished;

alternatively, a beam may be understood as a main lobe formed by the transmit pattern of an antenna array, such as a beam (of antenna) is the main lobe of the radiation pattern of an antenna array;

optionally, the same communication device (e.g., a terminal device or a network device) may have different precoding vectors, and different devices may also have different precoding vectors, that is, different beams may correspond to different directions, which may be understood as that the device uses different beams to indicate that the device uses different precoding vectors, and optionally, further distinguish between an uplink precoding vector and a downlink precoding vector, or distinguish between precoding vectors used for transmitting information and precoding vectors used for receiving information.

Optionally, the Beam/Beam may also be understood as a spatial domain transmission filter; the device (e.g., network device and/or user device) using the beam may be replaced with a device using a spatialdomain transmission filter spatial domain transmission filter;

optionally, one communication device may use one or more of a plurality of different precoding vectors at the same time, i.e. may form one or more beams at the same time, depending on the configuration or capabilities of the communication device. The information of the beam may be identified by index information. Optionally, the index information may be configured with a resource Identifier (ID) of the UE, for example, the index information may be configured with an ID or a resource of a Channel state information Reference Signal (CSI-RS), or may be configured with an ID or a resource of an uplink Sounding Reference Signal (SRS). Or, alternatively, the index information may also be index information explicitly or implicitly carried by a signal or channel carried by a beam, for example, the index information may be index information indicating the beam by a synchronization signal or a broadcast channel transmitted by the beam.

The beam pair may include a transmission beam at a transmitting end and a reception beam at a receiving end, or may also be referred to as an uplink beam or a downlink beam. For example, the beam pair may include a gNB Tx beam transmission beam or a UE Rx beam reception beam, or a UE Tx beam transmission beam or a gNB Rx beam reception beam, wherein a transmission beam may also be understood as a transmission beam.

Optionally, the identification information of the beam may specifically be one or more of an ID of the beam, an ID generated based on the ID of the beam, a name of the beam, an index generated based on the index of the beam, a derivative value of the ID of the beam, a derivative value of the index of the beam, a hash value of the ID of the beam, a hash value of the name of the beam, a hash value of the index of the beam, a truncation value of the ID of the beam, a truncation value of the index of the beam, an ID of the beam combined with a hash value of plaintext information, a name of the beam combined with a hash value of plaintext information, an index of the beam combined with a hash value of plaintext information, a bit table of the ID of the beam, a bit table of the name of the beam, a bit table of the index of the beam, a bit table of the beam, and the like.

The device does not limit the use of a certain beam (e.g., nth beam, N being any one of the beams supported by the device), and for convenience of understanding, the device uses the first beam as an example;

optionally, for example: the device uses a first beam, which may instead be in a first direction; further, the device using the first transmit beam may instead be the device in the first transmit direction, and/or the device using the first receive beam may instead be the device in the first receive direction;

optionally, for example: the device uses the first beam (or in the first direction), the device may instead use the first spatial resource; further, the device may use the first transmit beam instead of using the first transmit spatial resource, and/or the device may use the first receive beam instead of using the first receive spatial resource;

optionally, for example: the device uses a first beam (or in a first direction), the device may instead use a first antenna pattern; further, the device may use the first transmit beam instead of using the first transmit antenna pattern, and/or the device may use the first receive beam instead of using the first receive antenna pattern;

optionally, for example: the device uses a first beam (or in a first direction), the device may instead use a first antenna array pattern; further, the device may use the first transmit beam instead of using the first transmit antenna array pattern, and/or the device may use the first receive beam instead of using the first receive antenna array pattern;

optionally, for example: the device uses a first beam (or in a first direction), which may be replaced with a device that uses a first spatial domain transmission filter spatial domain transmission filtering;

further, the device uses the first transmit beam, which may be replaced with the device using a first spatial domain transmission filter for transmission; and/or, the device uses the first receive beam, the device may instead use the first spatial domain transmit filter for reception;

optionally, for example: the device uses the first transmit beam (or in a first direction), which may instead be the device using a first transmit spatial domain transmit filter; and/or, the device uses the first receive beam, the device may instead use the first receive spatial domain transmit filter;

optionally, for example: the device uses a first beam (or in a first direction), instead the device uses a first precoding vector; further, the device may use the first transmit beam instead of using the first transmit precoding vector, and/or the device may use the first receive beam instead of using the first receive precoding vector;

optionally, for example: the device uses a first beam (or in a first direction), the device may instead use a first weight; further, the device using the first transmit beam may instead use the first transmit weight, and/or the device using the first receive beam may instead use the first receive weight;

optionally, for example: the device uses a first beam (or in a first direction), which may be replaced by the device using a first parameter (such as a parameter involved in the antenna array); further, the device may use the first transmit beam instead of using the first transmit parameter, and/or the device may use the first receive beam instead of using the first receive parameter;

optionally, for example: the device uses a first beam (or in a first direction), and may instead use a first weighting parameter (such as different antennas in an antenna array using different parameters); further, the device using the first transmit beam may instead use the first transmit weighting parameter, and/or the device using the first receive beam may instead use the first receive weighting parameter;

optionally, for example: the device may use a first beam (or in a first direction), may instead use first Beamforming (further, the device may use a first transmit beam, may instead use first transmit Beamforming, and/or the device may use a first receive beam, may instead use first receive Beamforming;

optionally, the sending beam (or referred to as a downlink beam) used by the network device corresponds to a CRI (channel State Reference Signal resource indicator),

optionally, for example, the first transmission beam (or in the first direction) corresponds to a first CRI, and the second transmission beam (or in the second direction) corresponds to a second CRI; optionally, the network device sends information on a first channel state reference signal resource, which indicates that the network device uses a first sending beam; optionally, the user equipment indicates the CRI of the network device, that is, indicates the transmission beam of the network device, for example, optionally, the UE indicates a first CRI of the network device, that is, indicates a first transmission beam of the network device;

optionally, the transmission beam (or referred to as a downlink beam) used by the network device corresponds to an SBRI (SSB, synchronization signaling block resource indicator), for example, a first transmission beam (or in a first direction) corresponds to a first SBRI, and a second transmission beam (or in a second direction) corresponds to a second SBCRI; optionally, the network device sends information in the first synchronization signal block resource, which indicates that the network device uses the first sending beam; optionally, the UE indicates an SBRI of the network device, that is, indicates a transmission beam of the network device, for example, optionally, the UE indicates a first SBRI of the network device, that is, indicates a first transmission beam of the network device;

optionally, the transmission beam (or referred to as a downlink beam) used by the network device corresponds to an SSB index (SSB, synchronization signals block index), for example, the first transmission beam (or in the first direction) corresponds to a first SSB index, and the second transmission beam (or in the second direction) corresponds to a second SSB index;

optionally, the network device sends information on a resource corresponding to the first SSB, which indicates that the network device uses the first sending beam; optionally, the UE indicates the SSB index of the network device, that is, indicates the transmission beam of the network device, for example, optionally, the UE indicates a first SSB index of the network device, that is, indicates the first transmission beam of the network device;

optionally, the sending beam (or referred to as a downlink beam) used by the network device corresponds to an SSB time index (SSB, synchronization signaling block time index), for example, a first sending beam (or in a first direction) corresponds to a first SSB time index, and a second sending beam (or in a second direction) corresponds to a second SSB time index; optionally, the network device sends information on a resource corresponding to the first SSB time, which indicates that the network device uses the first sending beam; optionally, the UE indicates the SSB time index of the network device, that is, indicates the transmission beam of the network device, for example, optionally, the UE indicates the first SSB time index of the network device, that is, indicates the first transmission beam of the network device.

In this application, the user equipment sends information to the network equipment, which may also be referred to as the user equipment sending information to the network equipment, and the user equipment sending information to the network equipment may be replaced by the user equipment sending information to the network equipment, which is not limited herein,

specifically, the user equipment sends information to the network equipment, the user equipment broadcasts information to the network equipment, and the user equipment multicasts information to any one of the network equipment, where the sent information is not limited, for example: the information may be preamble, identification information of the user, transmission beam information of the user, data, management information, control information request information, indication information, SRS, SR, resource information, and the like.

In this application, the network device sends information to the user equipment, which may also be referred to as the network device sending information to the user equipment, and the network device sending information to the user equipment may be replaced by the network device sending information to the user equipment, which is not limited in this document,

specifically, the network device sends information to the user equipment, the network device broadcasts information to the user equipment, and the network device multicasts information to any one of the user equipment, where the sent information is not limited, for example: may be resource information, identification information of the user, transmission beam information of the user, data, management information, control information request information, indication information, transmission beam division information, and the like.

For example, the first user equipment sends the preamble to the network device by using the transmission beam, where the preamble is sent to the network device by the first user equipment, the first user equipment broadcasts the preamble to the network device, and the first user equipment multicasts the preamble to any one of the network devices; the network device sends the first resource information to the first user device, which may be that the network device sends a preamble to the first user device, the network device broadcasts the preamble to the first user device, and the network device multicasts the preamble to any one of the first user devices; the network device sends information to the user device, where the network device sends information to the user device corresponding to the identification information, and the identification information used by the user device may be: C-RNTI, TC-RNTI, RA-RNTI; for example, the network device sends the resource information to the user equipment, and the network device may send the resource information to the user equipment using the identity information that is the C-RNTI.

Fig. 6 is a flowchart of a first embodiment of a random access method provided in the present application, and as shown in fig. 6, the random access method provided in this embodiment is applied between a network device and a user equipment, and the method includes the specific steps of:

s101: the network device configures corresponding BI adjustment parameters and/or power parameters for different random access procedure conditions.

In this step, the network device may configure different BI adjustment parameters and/or power parameters for different situations where the user equipment performs the random access procedure, so that the user equipment may back off according to different parameters under different situations, and adjust power for random access, thereby improving the efficiency of the random access procedure.

S102: the user equipment receives random access configuration information sent by the network equipment; the random access configuration information includes a BI adjustment parameter and/or a power parameter corresponding to at least one random access procedure condition.

In this step, the network device may send the random access configuration information in a broadcast manner, where the random access configuration information includes at least one BI adjustment parameter and/or power parameter corresponding to a random access procedure condition. The network device broadcasts the configured random access configuration information so that each user equipment can receive the random access configuration information.

In a specific implementation of the scheme, the power parameter includes a power adjustment parameter or a power ramp step size, and the power adjustment parameter or the power ramp step size is used to increase the transmission power.

If the power parameter is a power adjustment parameter, the ue needs to increase the transmit power according to the recorded (or received) power ramp step size and the power adjustment parameter; if the power parameter is a power ramp step size, the user equipment may increase the transmit power directly according to the power ramp step size.

S103: and when the user equipment executes the first random access process condition, sending a random access preamble signal to the network equipment for random access according to the received BI and a first BI adjustment parameter and/or a first power parameter corresponding to the first random access process condition.

In this step, it should be understood that the random access procedure is performed, and RA is performed for the first time without backoff, power ramping; in case of RA failure, when RA is re-initiated, backoff is used, and power ramping power is ramped up.

In a random access process performed by a user equipment, when it is determined that a first random access process condition is performed, a preamble signal may be sent according to a first BI adjustment parameter and/or a first power parameter corresponding to the first random access process condition, specifically, the method at least includes the following implementation manners:

in a first implementation manner, the user equipment sets a backoff parameter according to the received BI and the first BI adjustment parameter, selects a backoff time according to the backoff parameter, and sends a random access preamble to the network equipment for random access after waiting for the backoff time.

The meaning is that, under the condition that the user equipment executes the first random access process, the user equipment sets a backoff parameter (backoff parameter) according to the received BI and the first BI adjustment parameter, and selects a random backoff time to wait for the random backoff time based on the backoff parameter, and then the user equipment sends a preamble to the network equipment.

In a second implementation manner, the user equipment increases the transmission power according to the first power parameter, and sends a random access preamble signal to the network equipment for random access according to the increased transmission power.

The meaning is that the user equipment sends preamble to the network equipment by using the sending power after the sending power is increased according to the power ramp step and the first power parameter under the condition of executing the first random access process.

In the third implementation mode, the user equipment sets a backoff parameter according to the received BI and the first BI adjustment parameter, selects backoff time according to the backoff parameter, increases the transmission power according to the first power parameter, and sends a random access preamble signal to the network equipment for random access according to the increased transmission power after waiting for the backoff time.

The implementation mode is a combination of the first two modes, namely, the backoff time is determined according to the first BI adjustment parameter, the power is increased according to the first power parameter, and preamble is sent to the network equipment according to the increased transmission power after the backoff time is reached.

In the above several implementations, it should be understood that the performing of the power increase according to the first power parameter includes at least two cases, and when the first power parameter includes the first power adjustment parameter, the ue needs to increase the transmission power according to the recorded or received power ramp step size and the first power adjustment parameter. When the first power parameter includes a first power ramp step length, the user equipment may increase the transmit power directly according to the first power ramp step length.

In a specific implementation of the solution, if the ue executes a second random access procedure and the random access configuration information does not include a BI adjustment parameter and/or a power parameter corresponding to the second random access procedure, the ue sets a backoff parameter according to the received BI, selects a backoff time based on the backoff parameter, and sends a random access preamble to the network device for random access after the backoff time and/or according to the received transmit power after the power ramp-up step is increased.

The meaning of the method is that the network device does not configure a second BI adjustment parameter for the situation that the user device executes a second random access process, and/or the second power adjustment parameter or a second power ramp step length, then when performing random access, a backoff parameter can be set according to the received BI, the user device selects a random backoff time based on the backoff parameter to wait for the random backoff time, and/or the user device sends preamble to the network device using the recorded or pre-received transmission power increased according to the power ramp step length.

After the ue sends the random access preamble to the network device, a specific implementation of the scheme further includes the following steps:

and under the condition that the random access response message is considered to be failed in receiving or the condition that the conflict resolution is considered to be failed, the user equipment sends the random access preamble signal to the network equipment again for random access according to the received backoff indication BI and the first BI adjustment parameter and/or the first power parameter corresponding to the first random access process condition.

In the scheme, the user equipment receives the random access response message returned by the network equipment, and if the random access response message is confirmed successfully, the subsequent RRC connection process is executed.

If the random access response message is considered to be failed or the conflict resolution is considered to be failed, the ue may set a backoff parameter (backoff parameter) according to the received BI and the first BI adjustment parameter, and the ue selects a random backoff time based on the backoff parameter to wait for the random backoff time, and/or the ue sends a preamble to the network device using the transmit power increased according to the power ramp step and the first power adjustment parameter or the transmit power increased according to the first power ramp step.

In the random access method provided in this embodiment, the network device configures different BI adjustment parameters and/or power parameters for different situations of the user equipment performing the random access process, and when the user performs a certain random access process situation, for example, a first random access process situation, the network device may send a random access preamble signal to the network device for performing the random access process according to the received BI and a first BI adjustment parameter and/or a first power parameter corresponding to the first random access process situation, that is, the user equipment may select to use the corresponding BI adjustment parameter to adjust the backoff parameter and the transmission power according to the different random access process situations, which may speed up the completion of the random access and reduce interference to the network.

Fig. 7 is a flowchart of a second embodiment of the random access method provided in the present application, and as shown in fig. 7, another implementation manner of the random access method includes the following steps:

s201: the network device configures corresponding BI adjustment parameters and/or power parameters for different random access procedure conditions.

S202: the user equipment receives random access configuration information sent by the network equipment; the random access configuration information includes BI adjustment parameters and/or power parameters corresponding to at least two random access procedure conditions.

In this step, the network device broadcasts random access configuration information, where the random access configuration information includes BI adjustment parameters and/or power parameters corresponding to multiple random access process conditions. The network device broadcasts the configured random access configuration information so that each user equipment can receive the random access configuration information.

S203: when the user equipment changes from executing the second random access process condition to executing the first random access process condition, sending a random access preamble signal to the network equipment for random access according to the received BI and a first BI adjustment parameter and/or a first power parameter corresponding to the first random access process condition; or sending a random access preamble signal to the network equipment for random access according to the received BI and the power ramp step length.

Also, in this scheme, the first power parameter includes a first power adjustment parameter or a first power ramp step size, and the first power adjustment parameter or the first power ramp step size is used to increase the transmission power.

The meaning of this scheme is that, under the condition that the ue changes from the case of executing the second random access procedure to the case of executing the first random access procedure, the ue may perform backoff and power increase according to the first BI adjustment parameter and/or the first power parameter corresponding to the case of the first random access procedure, and then send a random access preamble, which is similar to the specific implementation manner in the embodiment.

Or, the user equipment may directly set a backoff parameter according to the BI, select a backoff time according to the backoff parameter, and send a preamble to the network equipment after waiting for the backoff time and/or after increasing the transmission power according to the recorded power ramp step length. In this scenario, the BI is a BI recorded when the second random access procedure scenario is performed. The scheme comprises the following implementation modes:

in a first implementation manner, the user equipment sets a backoff parameter according to the received BI, selects a backoff time according to the backoff parameter, and sends a random access preamble to the network equipment for random access after waiting for the backoff time.

In a second implementation manner, the user equipment increases the transmission power according to the received power ramp step length, and sends a random access preamble signal to the network equipment for random access according to the increased transmission power.

In a third implementation manner, the user equipment sets a backoff parameter according to the received BI, selects a backoff time according to the backoff parameter, increases the transmission power according to the received power ramp step length, and sends a random access preamble signal to the network equipment for random access according to the increased transmission power after waiting for the backoff time.

Or, the user equipment may directly set the backoff parameter to 0, and/or directly send the preamble to the network equipment for random access without changing the transmission power, which is not limited in this scheme.

In the above scheme, the first BI adjustment parameter is different from the second BI adjustment parameter; the first power adjustment parameter is different from the second power adjustment parameter; the first power ramp step size is different from the second power ramp step size.

If in a specific implementation of the foregoing scheme, the network device executes, for the ue, the first BI adjustment parameter that is not configured in the case of the first random access procedure, and/or the first power adjustment parameter or the first power ramp step size. The user equipment sets a backoff parameter according to the BI, selects a random backoff time to wait for the random backoff time and/or uses the transmission power increased according to the power ramp step length based on the backoff parameter, and sends a preamble to the network equipment; or, the user equipment sets the backoff parameter to 0, and/or the transmission power is not changed. The BI in the scheme performs the BI recorded in case of the second random access procedure.

In the random access method provided by this embodiment, the network device configures the BI adjustment parameter and/or the power adjustment parameter or the power ramp step size for different random access process conditions executed by the user device, and the user device may select to use the corresponding BI adjustment parameter to adjust the Backoff parameter and the transmit power according to different random access process conditions, thereby expediting the completion of random access and reducing interference to the network.

In the above two embodiments, it should be understood that several cases where the user equipment performs the random access procedure at least include the following cases, which are specific:

the method includes the steps that a user equipment performs Random Access (RA) when changing SSB of a selected network device, the user equipment performs RA when changing the total number of SSB of the selected network device to reach a preset threshold, the user equipment performs RA when changing beam transmitted by the user equipment to reach a preset threshold, the user equipment performs RA when performing a handover over process, the user equipment performs RA when performing a Beam Failure Recovery (BFR), the user equipment performs RA when receiving a command (PDCCH order) of the network device, the user equipment performs RA when losing uplink synchronization, the user equipment performs RA when having a SR counter (scheduling request counter) of the user equipment to reach a maximum, the user equipment performs RA when performing RRC (Radio Resource Control) connection reestablishment, the RA is executed when the user equipment accesses the network equipment for the first time, the RA is executed when the user equipment uses the first priority service, the RA is executed when the user equipment uses the second priority service, and so on.

Optionally, for example, the first random access procedure condition is: executing RA under the condition that the user equipment implements BFR, and configuring a first BI adjustment parameter for the first random access process condition by the network equipment; after receiving the BI in the RAR message, the user equipment sets a backoff parameter according to the BI and the first BI adjustment parameter, selects a random backoff time (random backoff time) based on the backoff parameter, and sends a preamble to the network equipment after waiting for the random backoff time.

Optionally, for another example, the first random access procedure condition is: executing RA under the condition that the user equipment implements BFR, and configuring a first power adjustment parameter for the first random access process condition by the network equipment; after receiving the powerrampincig step, the user equipment increases the transmission power according to the power climbing step and the first power adjustment parameter (for example, the increased transmission power is calculated based on the power climbing step and the first power adjustment parameter, for example, the power climbing step is multiplied by the first power adjustment parameter, and the increased transmission power is the previous transmission power plus the increased transmission power), and the user equipment uses the increased transmission power and sends a preamble to the network equipment.

Optionally, for another example, the first random access procedure condition is: executing RA under the condition that the user equipment implements BFR, and configuring a first power climbing step length for the first random access process condition by the network equipment; the user equipment increases the transmission power according to the first power ramp step (for example, the increased transmission power is the sum of the previous transmission power and the first power ramp step), and the user equipment uses the increased transmission power and sends a preamble to the network equipment.

Optionally, for example, the second random access procedure condition is: executing RA under the condition that the uplink of the user equipment is out of synchronization, and configuring a second BI adjustment parameter for the condition of a second random access process by the network equipment; after receiving the BI in the RAR message, the user equipment sets a backoff parameter according to the BI and the second BI adjustment parameter, selects a random backoff time (random backoff time) based on the backoff parameter, and sends a preamble to the network equipment after waiting for the random backoff time.

Optionally, for another example, the second random access procedure condition is: executing RA under the condition that the uplink of the user equipment is out of synchronization, and configuring a second power adjustment parameter for the condition of a second random access process by the network equipment; after receiving the powerrampincig step, the user equipment increases the transmission power according to the power climbing step and the second power adjustment parameter (for example, the increased transmission power is calculated based on the power climbing step and the second power adjustment parameter, for example, the power climbing step is multiplied by the second power adjustment parameter, and the increased transmission power is the previous transmission power plus the increased transmission power), and the user equipment uses the increased transmission power and sends a preamble to the network equipment.

Optionally, for another example, the second random access procedure condition is: executing RA under the condition that the user equipment is out of synchronization in an uplink mode, and configuring a second power climbing step length for the first random access process condition by the network equipment; the user equipment increases the transmission power according to the second power ramp step (for example, the increased transmission power is the sum of the previous transmission power and the second power ramp step), and the user equipment uses the increased transmission power and sends a preamble to the network equipment.

Fig. 8 is a flowchart of a third embodiment of the random access method provided in the present application, and as shown in fig. 8, the random access method provided in the present embodiment includes the following steps:

s301: the user equipment selects the first SSB sent by the network equipment to send a random access preamble signal to the network equipment.

In this step, the network device configures different BIs for different SSBs (different SSBs correspond to different transmission beams, and the first transmission beam corresponds to the first SSB), that is, the first SSB corresponds to the first BI, and/or the network device configures different power ramp step sizes for different SSBs, that is, the first SSB corresponds to the first power ramp step size.

When the user equipment needs to perform random access, selecting a first SSB, and sending a random access preamble signal to the network equipment according to the selected first SSB, specifically, the user equipment sends the random access preamble signal to the network equipment by using a PRACH resource corresponding to the first SSB. The network equipment receives a random access preamble signal sent by the user equipment and recognizes that the user equipment selects a first synchronization signal block SSB. Specifically, the network device receives the random access preamble signal sent by the user equipment through the PRACH resource corresponding to the first SSB.

In this scheme, the UE may select at least according to Reference Signal Received Power (RSRP) of the SSB, for example, select the SSB with the largest RSRP; or, selecting SSBs with RSRP greater than some threshold.

S302: the network equipment returns a random access response to the user equipment; the random access response includes a first BI and/or a first power ramp step size corresponding to the first SSB.

In this step, the network device receives a preamble sent by a first user, the user device selects a first SSB synchronization signal block, the network device sends an RAR message, the RAR message carries a first BI and/or a first power ramp step length, the first BI and/or the first power ramp step length corresponds to a first SSB, and the first SSB is sent by the network device. And the user equipment receives the random access response returned by the network equipment.

S303: and under the condition that the random access response message reception is considered to be failed or the conflict resolution is considered to be failed, the user equipment sends the random access preamble signal to the network equipment again according to the first BI and/or the first power ramp step size for random access.

In this step, in a case where the random access response message is considered to be failed or in a case where collision resolution is considered to be failed, the user equipment may determine a backoff parameter based on the first BI corresponding to the first SSB, select a random backoff time according to the backoff parameter, and send the random access preamble signal to the network equipment after waiting for the backoff time and/or using a transmission power increased based on a power ramp-up step size. The method specifically comprises the following implementation modes:

in a first implementation manner, the user equipment selects a backoff time based on the BI, and after waiting for the backoff time, sends a random access preamble to the network equipment again for random access.

In a second implementation manner, the user equipment increases the transmission power based on the first power ramp step length, and sends a random access preamble signal to the network equipment again for random access according to the increased transmission power;

in a third implementation manner, the user equipment selects backoff time based on the BI, increases transmission power based on the first power ramp step length, and sends the random access preamble signal to the network equipment again for random access according to the increased transmission power after waiting for the backoff time.

In a specific implementation of the scheme, the network device may further receive a random access preamble signal sent by the user equipment through the second SSB; the network equipment returns a random access response to the user equipment according to the random access preamble signal; the random access response comprises a second BI and/or a second power ramp step corresponding to the second SSB. Specifically, the network device receives the random access preamble signal sent by the user equipment through the PRACH resource corresponding to the second SSB.

Or, the network device may further receive a random access preamble signal sent by the second user equipment, the second user equipment selects the second SSB, the network device sends an RAR message, the RAR message carries a second BI and/or a second power ramp step size, the second BI and/or the second power ramp step size corresponds to the second SSB, the second SSB is sent by the network device, and the second BI is different from the first BI and/or the first power ramp step size is different from the second power ramp step size.

The network device uses a first transmission beam to correspond to the first SSB and uses a second transmission beam to correspond to the second SSB. The number of user equipments covered by the first transmission beam is different from the number of users covered by the second transmission beam. For example, the number of users of the first transmission beam cover is greater than the number of users of the second transmission beam cover, and the first BI value is greater than the second BI value. For another example: the number of users of the first sending wave beam cover is less than that of the users of the second sending wave beam cover, and the first power climbing step value is greater than the second power climbing step value.

The random access method provided by this embodiment configures different BI and/or power ramp step sizes for different SSBs for different numbers of users covered by different beams, thereby avoiding that UEs with different congestion degrees use the same BI to perform backoff processes, accelerating the completion of the random access process, and reducing interference to the network.

In addition to the above embodiments, the present application also provides another random access scheme, including: the user equipment sends a random access preamble signal to the network equipment by using the first transmission beam and/or the first random access resource, wherein the random access preamble signal is used for initiating a random access process and receiving a BI sent by the network equipment. The user equipment sets a backoff parameter according to the BI, and then executes any one of the following schemes under the condition that the random access response message reception is considered to fail or the condition that the conflict resolution is considered to fail: wherein,

This scheme is illustrated below by several specific implementations: in the following implementation manner, the first message in the random access procedure may be an Msg1 message in the random access procedure (e.g., a message containing random access preamble information sent by the user equipment in fig. 1), or a message obtained by modifying an Msg1 message; the second message in the random access procedure may be an Msg2 message (such as the RAR message sent by the network device in fig. 1), or a modified Msg2 message (i.e., a modified message of the RAR message); the third message in the random access procedure may be Msg3 in the random access procedure (e.g., Msg3 message sent by the user equipment in fig. 1), or a modified message of the third message in the random access procedure; the fourth message in the random access procedure may be an Msg4 message (e.g., the message containing the contentionresolution information sent by the network device in fig. 1), or a message obtained by modifying the Msg4 message.

The first implementation mode comprises the following steps:

the network equipment sends an RAR message carrying BI; optionally: before the network device sends the RAR message, the network device receives a preamble, where the preamble may be sent by the first user device using the first beam, or sent by the second user device; the first user equipment is different from the second user equipment;

the first user equipment receives the RAR message, obtains a BI in the RAR message, and the UE sets a background parameter according to the BI; optionally, before receiving the RAR message, the first user equipment sends a preamble to the network equipment side by using a first beam;

optionally, the first user equipment sends a preamble by using a first resource (optionally, the first resource may be referred to as a PRACH resource, or as a Random Access (RA) resource), the first user equipment selects a first sending beam of the network equipment corresponding to the first resource, and the first user equipment uses a first beam, which is a sending beam of the first user equipment.

On the basis of the BI obtained above, the first user equipment, in a first case (the first case may also be referred to as a case where the first user equipment is ready to initiate a Random Access procedure again or a case where the first user equipment is ready to send a preamble again) where the Random Access Response message reception is considered to fail (Random Access Response is subsequent not request message), or in a second case (the collision Resolution is subsequent not request message) where the collision Resolution is considered to fail, performs the following actions (when one of the above 2 cases occurs):

if the first user equipment uses the first beam, the first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access process (the random access process initiated by the first user equipment may be replaced by sending a preamble by the first user equipment, which is not limited in the whole text).

The specific execution action of the first user equipment is as follows:

the first user equipment selects a number X as a back-off time (Backoff time) from 0 to Backoff Parameter Value, and after waiting for the X time, the first user initiates a random access process (or after waiting for the X time, the first user sends a preamble);

x is 0 or more and less than or equal to Backoff Parameter Value, and the time unit of X is ms (millisecond), or other time units;

optionally, in this scheme, the preamble transmitted may be different from the preamble transmitted by the first user equipment using the first beam at the beginning. The first user equipment can be replaced by another preambel for use. (to help reduce the occurrence of collisions)

If the first user equipment uses the second beam, which is different from the first beam, the first user equipment sets the backoff parameter (backoff parameter) to 0 (the first user equipment sets the backoff parameter (backoff parameter) to 0, which may be replaced by the first user equipment initiating the random access procedure while waiting for 0ms or the first user equipment waiting for 0ms to send the preamble, which is not limited in its entirety).

The specific execution action of the first user equipment is as follows:

x is 0 or more and less than or equal to Backoff Parameter Value, and the time unit of X is ms (millisecond), or other time units; in this scenario, it should be understood that the first user equipment may be a user equipment that does not support beam coherence. The first beam and the second beam are the sending beams of the first user equipment;

the beam used by the first user equipment after the random access response message reception is considered to have failed or the collision resolution is considered to have failed is the first transmission beam. The beam used by the first user equipment after the random access response message reception is considered to have failed or the collision resolution is considered to have failed is the second transmission beam.

In the above scheme, the operation of setting the backoff parameter to 0 after the first user equipment obtains that the network equipment instructs to use the handover transmission beam may be selectively performed.

The network device indicates in the RAR whether to use the operations defined herein. For example, 1bit (BI indication) indication information is occupied in reserved bits of a subheader of the RAR, and when the bit value is set to 1, the UE receiving the RAR message may be indicated to perform an operation of setting a backoff parameter to 0 after switching a transmission beam. Optionally, the first user equipment obtains, through the source network equipment, an operation of setting the backoff parameter to 0 after the target network equipment determines whether to use the handover transmission beam, and the first user equipment initiates a random access procedure to the target network equipment.

In the implementation mode, for different beam use conditions, the UE judges whether to execute the backoff according to specific conditions instead of executing the backoff blindly, so that blind waiting of the UE is avoided, and the process of accessing the UE to the network equipment is accelerated.

The second implementation mode comprises the following steps:

first, the network device sends an RAR message carrying a BI. Optionally: before the network device sends the RAR message, the network device receives a preamble, where the preamble may be sent by a first user device using a first beam, or sent by a second user device, and the first user device is different from the second user device.

The first user equipment receives the RAR message, obtains a BI in the RAR message, and the UE sets a backoff parameter according to the BI. Optionally, before receiving the RAR message, the first user equipment sends a preamble to the network device side by using a first beam.

Optionally, the first user equipment sends the preamble by using the first resource. The first resource corresponds to a first transmit beam of the network device. The first user equipment selects a first resource corresponding to a first beam of the first user equipment selection network equipment, and the first user equipment uses a first beam which is the transmission beam of the first user equipment.

Secondly, in a first case that the Random access response message reception is considered to be failed (Random access response is subscribed not available), or in a second case that the first user equipment is ready to initiate the Random access procedure again, or in a third case that the first user equipment is ready to send the preamble again, the first user equipment performs the following actions (when one of the above 3 cases occurs):

if the first user equipment uses the first resource, the first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access procedure or the first user equipment sends a preamble.

In this scheme, the specific execution action of the first user equipment is similar to the specific execution action of the first user equipment in the first implementation manner.

If the first user equipment selects a first transmission beam of the network equipment corresponding to the first resource, the first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access process or the first user equipment transmits a preamble.

The first resource and the first beam used by the network device have a corresponding relationship, or, referred to as, the first resource and the identification information of the first beam used by the network device have a corresponding relationship.

If the first user equipment uses the second resource, which is different from the first resource (the first resource is the first resource used when the first user equipment uses the first resource to send the preamble), the first user equipment sets the backoff parameter (backoff parameter) to 0. Or, the first user equipment initiates a random access process when waiting for 0ms or the first user equipment sends a preamble when waiting for 0 ms.

If the first user equipment selects a second beam of the network equipment corresponding to the second resource, the second resource is different from the first resource (the first sending beam of the network equipment corresponding to the first resource, and the first resource is the first resource used when the first user equipment sends the preamble by using the first resource), the first user equipment sets a backoff parameter (backoff parameter) to 0; or, the first user equipment initiates a random access process when waiting for 0ms or the first user equipment sends a preamble when waiting for 0 ms.

Supplementary explanation: the first resource and the first beam used by the network device have a corresponding relationship, or, referred to as, the first resource and the identification information of the first beam used by the network device have a corresponding relationship. The second resource and the second beam used by the network device have a corresponding relationship, or, referred to as, a corresponding relationship exists between the second resource and the identification information of the two transmission beams used by the network device.

The first user equipment may be a user equipment that does not support beam coherence. The first beam and the second beam are the sending beams of the first user equipment;

the first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access process or sends a preamble to the first user equipment, wherein the backoff parameter is set according to a BI in the latest RAR of multiple RARs received by the first user equipment. For example, the first user equipment uses the RAR received by the first beam as the latest RAR, and sets the backoff parameter according to the BI in the RAR, and for example, the first user equipment uses the RAR received by the second beam as the latest RAR, and sets the backoff parameter according to the BI in the RAR.

Optionally, the first user equipment obtains an operation of setting the backoff parameter to 0 after the network equipment indicates whether to support the PRACH resource switched and used by the first user equipment; or, the first user equipment sets the backoff parameter to 0 after switching the transmission beams of the selected network equipment.

Optionally, the network device indicates in the RAR whether to use the operation defined in the present invention; for example, 1bit (BI indication) indication information is occupied in reserved bits of subheaders of the RAR, and when a bit value is set to 1, the UE receiving the RAR message is indicated to perform an operation of setting a backoff parameter to 0 after switching the PRACH resource used; or, after switching the transmission beam of the selected network device, the first user device sets the backoff parameter to 0, and further, the network device automatically determines whether to use the indication information according to the load condition of the current network;

optionally, the first user equipment obtains, through the source network device, whether the PRACH resource that is indicated by the target network device and used by the first user equipment to be switched is supported, and then sets the backoff parameter to 0; or, after the first user equipment switches the transmission beam of the selected network equipment, the backoff parameter is set to 0, and the first user equipment initiates a random access process to the target network equipment.

According to the embodiment, the UE judges whether to use the execution backoff according to the specific conditions instead of executing the backoff blindly aiming at the use conditions of different PRACH resources or the sending beam condition of the network equipment selected by the UE, so that the blind waiting of the UE equipment is avoided, and the process of accessing the UE equipment to the network equipment is accelerated.

The third implementation mode comprises the following steps:

the foregoing steps are similar to those in the foregoing two embodiments, and the first user equipment performs the following actions in a first case where Random Access Response message reception is considered to be failed (Random Access Response is received not received), or in a second case where the first user equipment is ready to initiate a Random Access procedure again, or in a third case where the first user equipment is ready to send a preamble again (when one of the above 3 cases occurs):

if the first user equipment uses the first resource, the first user equipment uses the first beam, the first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access process or the first user equipment sends a preamble.

If the first user equipment selects a first sending beam of the network equipment corresponding to the first resource, the first user equipment uses the first beam, the first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access process or the first user equipment sends a preamble;

supplementary explanation: the first resource and the first beam used by the network device have a corresponding relationship, or, referred to as, the first resource and the identification information of the first beam used by the network device have a corresponding relationship.

If the first user equipment uses the second resource, if the first user equipment uses the second beam, the second beam is different from the first beam, the second resource is different from the first resource (the first resource is the first resource used when the first user equipment uses the first resource to send the preamble in step 201), the first user equipment sets a backoff parameter (backoff parameter) to 0; or the first user equipment initiates a random access process when waiting for 0ms or the first user equipment sends a preamble when waiting for 0 ms;

if the first user equipment selects a second beam of the network equipment corresponding to the second resource, if the first user equipment uses the second beam, the second beam is different from the first beam, the second resource is different from the first resource (the first resource corresponds to a first transmission beam of the network equipment, the first resource is the first resource used when the first user equipment transmits preamble by using the first resource in step 201), the first user equipment sets a backoff parameter (backoff parameter) to 0; or, the first user equipment initiates a random access process when waiting for 0ms or the first user equipment sends a preamble when waiting for 0 ms.

The second resource and the second beam used by the network device have a corresponding relationship, or, referred to as, a corresponding relationship exists between the second resource and the identification information of the two transmission beams used by the network device.

The first user equipment changes the transmission beam (e.g., changing the transmission beam may be from using a first beam to using a second beam).

Supplementary explanation: the optional first user equipment's power ramping counter of power ramping has changed after the random access response message reception is deemed to have failed or the collision resolution is deemed to have failed. Optionally, the power ramp counter of power ramping of the first user equipment is not changed after the random access response message reception is considered to fail or the collision resolution is considered to fail.

In the implementation manner, two factors, namely the PRACH resource and the transmission beam of the user equipment, are considered at the same time, the use of different PRACH resources and the use of the transmission beam of the user equipment, or the transmission beam of the network equipment selected by the UE and the use of the transmission beam of the user equipment, and the UE determines whether to use the execution backoff according to specific conditions instead of executing the backoff blindly, so that the blind waiting of the UE is avoided, and the process of accessing the UE to the network equipment is accelerated.

The fourth implementation mode comprises the following steps:

the foregoing steps are similar to the foregoing several implementations, and the first user equipment performs the following actions in a first case where Random Access Response message reception is considered to be failed (Random Access Response is received not received), or in a second case where the first user equipment is ready to initiate a Random Access procedure again, or in a third case where the first user equipment is ready to send a preamble again (when one of the above 3 cases occurs):

if the POWER ramp counter (counter of POWER ramping) of the first user equipment changes (increases/decreases), or the transmit POWER of the first user equipment (the transmit POWER of the first user equipment may be the PREAMBLE reception TARGET POWER PREAMBLE _ RECEIVED _ TARGET _ POWER) reaches the maximum value (the maximum value of the transmit POWER of the first user equipment is obtained from the network equipment side), the first user equipment selects a random backoff time (random backoff time) based on the backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access procedure or the first user equipment transmits a PREAMBLE;

alternatively, in the case where the random access response message reception is considered to be failed, the power ramp counter is incremented by 1 (i.e., the value corresponding to the power ramp counter is incremented by 1).

Further optionally, when the transmit power of the first user equipment reaches the maximum value, and the first user equipment changes the transmit beam (for example, changing the transmit beam may be from using a first beam to using a second beam), the first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access procedure or the first user equipment transmits a preamble;

further optionally, if the power ramp counter of the first user equipment changes and the first user equipment changes the transmission beam, the first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access procedure or the first user equipment transmits a preamble.

Further optionally, if the power ramp counter of the first user equipment changes and the first user equipment does not change the transmission beam, the first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access procedure or the first user equipment transmits a preamble.

If the power ramp counter (counter of power ramping) of the first user equipment is not changed or the power ramp counter of the first user equipment is reset (reset), the first user equipment sets a backoff parameter (backoff parameter) to 0; or, the first user equipment initiates a random access process when waiting for 0ms, or the first user equipment waits for 0ms to send a preamble.

When the first user equipment changes the transmission beam, the counter value is not changed.

If the first user equipment uses the second resource, the second resource is different from the first resource (the first resource is the first resource used when the first user equipment sends the preamble by using the first resource), the first user equipment sets the power ramp counter to be 0.

If the power ramp counter of the first user equipment is not changed, the first user equipment sets a backoff parameter (backoff parameter) to 0 under the condition that the first user equipment changes the transmission beam, or the first user equipment initiates a random access process while waiting for 0ms, or the first user equipment sends a preamble while waiting for 0 ms.

If the power ramp counter of the first user equipment is not changed, the first user equipment sets a backoff parameter (backoff parameter) to 0 under the condition that the first user equipment does not change the transmission beam; or, the first user equipment initiates a random access process when waiting for 0ms, or the first user equipment waits for 0ms to send a preamble. If the counter of power ramping of the first user equipment is not changed, and the first user equipment does not change the transmission beam, the first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access procedure or the first user equipment sends a preamble;

supplementary explanation: the first user equipment may be a user equipment that does not support beam coherence. The first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access process or sends a preamble to the first user equipment, wherein the backoff parameter is set according to a BI in the latest RAR of multiple RARs received by the first user equipment. For example, the first user equipment uses the RAR received by the first beam as the latest RAR, and sets the backoff parameter according to the BI in the RAR, and for example, the first user equipment uses the RAR received by the second beam as the latest RAR, and sets the backoff parameter according to the BI in the RAR. The first user equipment changes the transmission beam (e.g., changing the transmission beam may be from using a first beam to using a second beam).

In the implementation manner, for the situation that whether a counter of power ramping changes or not, the UE determines whether to use execution backoff or not according to the specific situation, instead of executing backoff blindly, so that blind waiting of the UE device is avoided, and the process of accessing the UE device to the network device is accelerated.

The fifth implementation manner:

in a first case where the Random Access response message reception is considered to be failed (Random Access response is subscribed not received), or in a second case where the first user equipment is ready to initiate the Random Access procedure again, or in a third case where the first user equipment is ready to send the preamble again, the first user equipment performs the following actions (when one of the above 3 cases occurs):

if the first user equipment uses the first beam, or the transmission POWER of the first user equipment (the transmission POWER of the first user equipment may be PREAMBLE reception TARGET POWER PREAMBLE _ RECEIVED _ TARGET _ POWER) reaches a maximum value (optionally, the first user equipment obtains the maximum value of the transmission POWER of the first user equipment from the network equipment side), the first user equipment selects a random backoff time (random backoff time) based on the backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access procedure or the first user equipment transmits a PREAMBLE.

Further optionally, when the transmit power of the first user equipment reaches the maximum value, and the first user equipment changes the transmit beam, the first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access procedure or the first user equipment transmits a preamble.

If the first user equipment uses a second beam, which is different from the first beam, the first user equipment sets a backoff parameter (backoff parameter) to 0; or, the first user equipment initiates a random access process when waiting for 0ms, or the first user equipment waits for 0ms to send a preamble.

If the first user equipment uses a second beam, which is different from the first beam, and the power ramp counter (counter of power ramping) is not changed (increased/decreased), the first user equipment sets a backoff parameter (backoff parameter) to 0; or, the first user equipment initiates a random access process when waiting for 0ms, or the first user equipment waits for 0ms to send a preamble.

If the first user equipment uses a second beam, which is different from the first beam power ramp counter (counter of power ramping), the second beam is changed (increased/decreased), the first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff), and after waiting for the random backoff time, the first user equipment initiates a random access procedure or the first user equipment sends a preamble.

Supplementary explanation: the first user equipment may be a user equipment that does not support beam coherence. The first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access process or sends a preamble to the first user equipment, wherein the backoff parameter is set according to a BI in the latest RAR of multiple RARs received by the first user equipment. For example, the first user equipment uses the RAR received by the first beam as the latest RAR, and sets the backoff parameter according to the BI in the RAR, and for example, the first user equipment uses the RAR received by the second beam as the latest RAR, and sets the backoff parameter according to the BI in the RAR.

In the technical scheme provided by the implementation mode, aiming at the situation that whether the counter changes and the use conditions of different beams, the UE judges whether to use the execution back-off according to specific conditions instead of the blind execution back-off, thereby avoiding the blind waiting of the UE equipment and quickening the process of accessing the UE equipment to the network equipment.

The sixth implementation manner:

if the first user equipment uses the second beam, and the second beam is different from the first beam, whether the second beam is a useless transmission beam is judged.

If the second beam is not used, the first user equipment sets the backoff parameter to 0 ms.

If the second beam is used, selecting a random backoff time (random backoff time) based on the backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiating a random access procedure or the first user equipment sending a preamble.

Or, if the first user equipment uses the second beam, determining whether the second beam is an unused transmission beam in the beam scanning beam sweep (for example, the beam scanning is that the first user equipment has N beams, and the first user equipment uses beam 1 and beam 2 until beam N is beam sweep).

If the second beam is used in beam scanning, selecting a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiating a random access procedure or sending a preamble by the first user equipment.

Supplementary explanation: the first user equipment may be a user equipment that does not support beam coherence. The first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access process or sends a preamble to the first user equipment, wherein the backoff parameter is set according to a BI in a latest RAR of multiple RARs received by the first user equipment. For example, the first user equipment uses the RAR received by the first beam as the latest RAR, and sets the backoff parameter according to the BI in the RAR, and for example, the first user equipment uses the RAR received by the second beam as the latest RAR, and sets the backoff parameter according to the BI in the RAR.

In the scheme provided by the embodiment, in order to prevent the user equipment from continuously switching the beam, the backoff parameter is continuously set to 0, so that the user equipment is prevented from cheating.

The seventh implementation manner:

the first user maintains a timer per beam, for example, the first user maintains a timer (j) using beam (j), after or before using beam (j) to send preamble, the timer (j) is initially Xms and starts to decrease, if the first user equipment uses beam (j) again before time (j) decreases to 0ms, a random backoff time (random backoff time) is selected based on the backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access procedure or the first user equipment sends preamble.

If timer (j) time X is reduced to 0ms, using beam (j), the first user equipment sets backoff parameter to 0;

the timer (j) may be the first beam, or the second beam.

In the rule, the timer (j) may be initialized to 0ms and continuously increased, if the first user is set before the time of the timer (j) increases to Xms, the beam (j) is used again, a random backoff time (random backoff time) is selected based on the backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access procedure or the first user equipment sends a preamble.

If timer (j) time is increased to X, again using beam (j), the first user equipment sets backoff parameter to 0; the timer (j) may be the first beam, or the second beam.

The first user maintains a timer counter for each sending beam, for example, the first user maintains a counter (j) using beam (j), after or before sending preamble using beam (j), the counter (j) is initially X, sends preamble (j) once using beam (j) minus 1, and if the first user sets counter (j) before time X is minus 0, again uses beam (j), selects a random backoff time (random backoff time) based on the backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user device initiates a random access procedure or the first user device sends preamble.

If counter (j) time X is reduced to 0, using beam (j), the first user equipment sets backoff parameter to 0; the timer (j) may be the first beam, or the second beam.

In the rule, counter (j) may be initialized to 0, beam (j) is used to send preamble (j) once plus 1, if the first user is set before counter (j) increases to X (X is the maximum value), beam (j) is used again, a random backoff time is selected based on the backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access procedure or the first user equipment sends preamble.

If counter (j) time increases to X, using beam (j), the first user equipment sets backoff parameter to 0; the timer (j) may be the first beam, or the second beam.

Supplementary explanation: the first user equipment may be a user equipment that does not support beam coherence.

The first user equipment selects a random backoff time (random backoff time) based on a backoff parameter (backoff parameter), and after waiting for the random backoff time, the first user equipment initiates a random access process or sends a preamble to the first user equipment, wherein the backoff parameter is set according to a BI in the latest RAR in multiple RARs received by the first user equipment. For example, the first user equipment uses the RAR received by the first beam as the latest RAR, and sets the backoff parameter according to the BI in the RAR, and for example, the first user equipment uses the RAR received by the second beam as the latest RAR, and sets the backoff parameter according to the BI in the RAR.

The first user equipment changes the transmission beam (for example, changing the transmission beam can be from using the first beam to using the second beam)

According to the technical scheme provided by the implementation mode, in order to prevent the user equipment from continuously switching the beam, the backoff parameter is continuously set to be 0, and the user equipment is prevented from cheating.

In several implementations described above, the power ramp counter of powerramping of the first user equipment has changed after the random access response message reception is deemed to have failed or the collision resolution is deemed to have failed.

Optionally, the power ramp counter of power ramping of the first user equipment is not changed after the random access response message reception is considered to fail or the collision resolution is considered to fail.

Optionally, the beam used by the first user equipment after the random access response message reception is considered to be failed or the collision resolution is considered to be failed is the first transmission beam.

Optionally, the beam used by the first user equipment after the random access response message reception is considered to be failed or the collision resolution is considered to be failed is the second transmission beam.

Optionally, the first user equipment reaches the maximum value after the random access response message reception is considered to fail or the collision resolution is considered to fail.

Optionally, the power ramp counter of the first user equipment is reset after the random access response message reception is considered to fail or the conflict resolution is considered to fail.

In the random access methods disclosed in the several embodiments, for various situations formed by one or more of different beam usage situations, different PRACH resource usage situations, power ramp counter change situations, and the like, the UE determines whether to perform backoff according to specific situations, instead of performing backoff blindly, so that blind waiting of the UE device is avoided, and a process of accessing the UE device to the network device is accelerated. The scheme can also be applied to the communication fields of WiFi, Bluetooth, LiFi and the like.

Fig. 9 is a schematic structural diagram of a first embodiment of a user equipment provided in the present application, and as shown in fig. 9, the user equipment 10 includes: a receiving module 11, a processing module 12 and a transmitting module 13;

the receiving module 11 is configured to receive random access configuration information sent by a network device; the random access configuration information comprises a backoff indication BI adjustment parameter and/or a power parameter corresponding to at least one random access process condition;

the sending module 13 is configured to send a random access preamble signal to the network device for random access according to the received backoff indicator BI and the first BI adjustment parameter and/or the first power parameter corresponding to the first random access procedure condition when the processing module executes the first random access procedure condition.

Optionally, the receiving module 11 is further configured to receive a random access response message returned by the network device;

Optionally, the processing module 12 is specifically configured to:

or,

Optionally, when the user equipment executes a second random access process condition and the random access configuration information does not include a BI adjustment parameter and/or a power parameter corresponding to the second random access process condition, the processing module 12 is further configured to set a backoff parameter according to the received BI, select a backoff time based on the backoff parameter, and send a random access preamble to the network equipment through the sending module for random access after the backoff time and/or according to the received transmission power after the power ramp step is increased.

The user equipment provided in any of the above embodiments is configured to execute the technical solution on the user equipment side in any of the above method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.

Optionally, during another application of the user equipment 10;

the receiving module 11 is configured to receive random access configuration information sent by a network device; the random access configuration information comprises backoff indication BI adjustment parameters and/or power parameters corresponding to at least two random access process conditions;

when the ue changes from executing the second random access procedure to executing the first random access procedure, the processing module 12 sends a random access preamble to the network device for random access through the sending module 13 according to the received backoff indicator BI and the first BI adjustment parameter and/or the first power parameter corresponding to the first random access procedure; or, the processing module sends a random access preamble signal to the network device through the sending module according to the received BI and the power ramp step length to perform random access.

Optionally, the processing module 12 is specifically configured to:

or,

The user equipment provided in this embodiment is configured to execute the technical solution on the user equipment side in any of the foregoing method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.

Fig. 10 is a schematic structural diagram of a first embodiment of a network device provided in the present application, and as shown in fig. 10, the network device 20 includes:

a processing module 21, configured to configure corresponding backoff indicator BI adjustment parameters and/or power parameters for different random access process conditions;

a sending module 22, configured to send random access configuration information, where the random access configuration information includes at least one backoff indicator BI adjustment parameter and/or power parameter corresponding to a random access procedure condition.

The network device provided in this embodiment is configured to execute the technical solution on the network device side in any of the foregoing method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.

Fig. 11 is a schematic structural diagram of a second embodiment of a user equipment provided in the present application, and as shown in fig. 11, the user equipment 30 includes:

a sending module 31, configured to select a first SSB sent by a network device to send a random access preamble signal to the network device;

a receiving module 32, configured to receive a random access response returned by the network device; the random access response comprises a first backoff indication BI and/or a first power ramp step corresponding to the first SSB;

a processing module 33, configured to, when reception of the random access response message is deemed to have failed or when collision resolution is deemed to have failed, send a random access preamble to the network device again through the sending module according to the first backoff indicator BI and/or the first power ramp-up step size for performing random access.

Optionally, the sending module 31 is specifically configured to send the random access preamble signal to the network device by using the PRACH resource corresponding to the first SSB.

Optionally, the processing module 33 is specifically configured to:

or,

Fig. 12 is a schematic structural diagram of a second embodiment of a network device provided in the present application, and as shown in fig. 12, the network device 40 includes:

a receiving module 41, configured to receive a random access preamble signal sent by a user equipment, and recognize that the user equipment selects a first synchronization signal block SSB;

a sending module 42, configured to return a random access response to the ue according to the random access preamble; the random access response includes a first backoff indication BI and/or a first power ramp step corresponding to the first SSB.

Optionally, the receiving module 41 is specifically configured to receive the random access preamble signal sent by the user equipment through the PRACH resource corresponding to the first SSB.

The application also provides a user equipment, and the method comprises the following steps: a receiver, a processor, a transmitter, and a memory for storing a computer program;

the receiver is used for receiving random access configuration information broadcasted by the network equipment; the random access configuration information comprises a backoff indication BI adjustment parameter and/or a power parameter corresponding to at least one random access process condition;

Optionally, the processor is specifically configured to:

or,

The present application further provides a user equipment, comprising: a receiver, a processor, a transmitter, and a memory for storing a computer program;

Optionally, the processor is specifically configured to:

or,

The present application further provides a network device, comprising: a memory for storing a computer program;

a transmitter, configured to broadcast random access configuration information, where the random access configuration information includes a backoff indicator BI adjustment parameter and/or a power parameter corresponding to at least one random access procedure condition.

The present application further provides a user equipment, comprising: a memory for storing a computer program;

a transmitter, configured to select a preconfigured first SSB to transmit a random access preamble signal to a network device;

and a processor, configured to, in a case where reception of the random access response message is deemed to have failed or in a case where collision resolution is deemed to have failed, retransmit a random access preamble to the network device through the transmitter according to the first backoff indicator BI and/or the first power ramp-up step size for performing random access.

Optionally, the processor is specifically configured to:

or,

a receiver, configured to receive a random access preamble signal sent by a user equipment through a first SSB;

a transmitter, configured to return a random access response to the user equipment according to the random access preamble signal; the random access response includes a first backoff indication BI and/or a first power ramp step corresponding to the first SSB.

In the above-mentioned specific implementation of the user equipment or the network device, the number of the processors is at least one, and the processors are used for executing execution instructions stored in the memory, that is, the computer program. The network device performs the random access method provided in the foregoing various embodiments by performing data interaction with the user equipment through the communication interface, and optionally, the memory may also be integrated inside the processor.

The present application also provides a storage medium for storing a computer program, where the computer program is used to implement the random access method on the user equipment side in any embodiment.

The present application also provides a storage medium for storing a computer program for implementing the random access method on the network device side in any embodiment.

In the above specific implementation of the user equipment or the network device, it should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose processors, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present application may be embodied directly in a hardware processor, or in a combination of the hardware and software modules in the processor.

All or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The aforementioned program may be stored in a readable memory. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned memory (storage medium) includes: read-only memory (ROM), RAM, flash memory, hard disk, solid state disk, magnetic tape (magnetic tape), floppy disk (floppy disk), optical disk (optical disk), and any combination thereof.

Claims

1. A random access method, the method comprising:

the user equipment receives random access configuration information sent by the network equipment; the random access configuration information comprises a backoff indication BI adjustment parameter and/or a power parameter corresponding to at least one random access process condition;

2. The method of claim 1, wherein the power parameter comprises a power adjustment parameter or a power ramping step size, and wherein the power adjustment parameter or the power ramping step size is used for increasing the transmit power.

3. The method of claim 1, further comprising:

and under the condition that the reception of the random access response message is considered to be failed or under the condition that the conflict resolution is considered to be failed, the user equipment sends a random access preamble signal to the network equipment again for random access according to the received backoff indication BI and a first BI adjustment parameter and/or a first power parameter corresponding to the first random access process condition.

4. The method according to any of claims 1 to 3, wherein the sending a random access preamble to the network device for random access according to the received Backoff Indicator (BI) and the first BI adjustment parameter and/or the first power parameter corresponding to the first random access procedure condition comprises:

or,

5. The method according to any one of claims 1 to 4, further comprising:

when the user equipment executes a second random access process condition and the random access configuration information does not include a BI adjustment parameter and/or a power parameter corresponding to the second random access process condition, the user equipment sets a backoff parameter according to the received BI, selects a backoff time based on the backoff parameter, and sends a random access preamble signal to the network equipment for random access after the backoff time and/or according to the received transmission power after the power ramp step is increased.

6. A random access method, comprising:

the user equipment receives random access configuration information sent by the network equipment; the random access configuration information comprises backoff indication BI adjustment parameters and/or power parameters corresponding to at least two random access process conditions;

7. The method of claim 6, wherein the sending a random access preamble to the network device for random access according to the received BI and the power ramp-up step comprises:

or,

8. The method according to claim 6 or 7, wherein the BI is a BI recorded when performing the second random access procedure scenario.

9. A random access method, comprising:

the network equipment configures corresponding backoff indication BI adjustment parameters and/or power parameters for different random access process conditions;

the network equipment sends random access configuration information, wherein the random access configuration information comprises backoff indication BI adjustment parameters and/or power parameters corresponding to at least one random access process condition.

10. The method of claim 9, wherein a power parameter comprises a power adjustment parameter or a power ramping step size, and wherein the power adjustment parameter or the power ramping step size is used for increasing the transmission power.

11. A random access method, comprising:

the user equipment selects a first synchronous signal block SSB sent by the network equipment and sends a random access preamble signal to the network equipment;

12. The method of claim 11, wherein the user equipment selects a preconfigured first Synchronization Signal Block (SSB) to send a random access preamble to a network device, comprising:

and the user equipment sends the random access preamble signal to the network equipment by using the Physical Random Access Channel (PRACH) resource corresponding to the first SSB.

13. The method according to claim 11 or 12, wherein the ue sends a random access preamble to the network device again for random access according to the first backoff indicator BI and/or the first power ramp-up step, and comprises:

or,

14. A random access method, comprising:

the network equipment receives a random access preamble signal sent by user equipment, and recognizes that the user equipment selects a first Synchronization Signal Block (SSB);

15. The method of claim 14, wherein the network device receives a random access preamble signal sent by a user equipment through a first synchronization signal block SSB, and comprises:

and the network equipment receives the random access preamble signal sent by the user equipment through the Physical Random Access Channel (PRACH) resource corresponding to the first SSB.

16. The method of claim 14 or 15, wherein the network device uses a first transmission beam for the first SSB.

17. A user device, comprising: the device comprises a receiving module, a processing module and a sending module;

18. The UE of claim 17, wherein the power parameter comprises a power adjustment parameter or a power ramping step size, and wherein the power adjustment parameter or the power ramping step size is used for increasing the transmission power.

19. The UE of claim 17, wherein the receiving module is further configured to receive a random access response message returned by the network device;

20. The ue of any one of claims 17 to 19, wherein the processing module is specifically configured to:

or,

21. The ue according to any one of claims 17 to 20, wherein when the ue executes a second random access procedure and the random access configuration information does not include a BI adjustment parameter and/or a power parameter corresponding to the second random access procedure, the processing module is further configured to set a backoff parameter according to the received BI, select a backoff time based on the backoff parameter, and send a random access preamble to the network device for random access through the sending module after the backoff time and/or according to the received transmission power after the power ramp-up step is increased.

22. A user device, comprising: the device comprises a receiving module, a processing module and a sending module;

23. The ue of claim 22, wherein the processing module is specifically configured to:

or,

24. A network device, comprising:

25. The network device of claim 24, wherein the power parameter comprises a power adjustment parameter or a power ramping step size, and wherein the power adjustment parameter or the power ramping step size is used to increase transmit power.

26. A user device, comprising:

a sending module, configured to select a first synchronization signal block SSB sent by a network device, and send a random access preamble signal to the network device;

and the processing module is used for sending a random access preamble signal to the network equipment again for random access through the sending module according to the first backoff indication BI and/or the first power ramp step length under the condition that the reception of the random access response message is considered to be failed or the conflict resolution is considered to be failed.

27. The ue of claim 26, wherein the sending module is specifically configured to send the random access preamble signal to the network device using PRACH resource corresponding to the first SSB.

28. The ue of claim 26 or 27, wherein the processing module is specifically configured to:

or,

29. A network device, comprising:

a receiving module, configured to receive a random access preamble signal sent by a user equipment, and recognize that the user equipment selects a first synchronization signal block SSB;

a sending module, configured to return a random access response to the user equipment; the random access response includes a first backoff indication BI and/or a first power ramp step corresponding to the first SSB.

30. A random access method, comprising:

the user equipment sets a backoff parameter according to the BI;

the user equipment performs any one of scheme a, scheme B, and scheme C in a case where random access response message reception is considered to fail or in a case where collision resolution is considered to fail: wherein,

scheme C: if the transmission power of the user equipment reaches the maximum value and the beam currently used by the user equipment is a second transmission beam, the user equipment selects a random back-off time based on the back-off parameter, and after waiting for the random back-off time, the user equipment initiates a random access process to the network equipment again.