TW201906361A - Method and terminal device for transmitting random access preamble - Google Patents

Abstract

The embodiments of the present application relate to a method for transmitting a random access preamble, and a terminal device. The method comprises: a terminal device transmitting, through a first transmission beam, a first random access preamble to a network device; and where the terminal device determines that the transmission of the first random access preamble has failed, the terminal device sending a second random access preamble to the network device through a second transmission beam, the first transmission beam being different from the second transmission beam. With regard to the method for transmitting a random access preamble and the terminal device according to the embodiments of the present application, in the case of the transmission of a first random access preamble through a first transmission beam failing, the terminal device can switch a transmission beam to retransmit a random access preamble, i.e. retransmitting using a second transmission beam different from the first transmission beam.

Description

Method and terminal equipment for sending random access preamble

This application relates to the field of communications, and in particular, to a method and terminal device for sending a random access preamble.

In the multi-beam system currently discussed in 5G / NR, different beams will correspond to different directions and different coverage areas. User equipment (UE) selects itself by measuring signals carried on different beams (such as synchronization signals or Channel State Information (CSI) -Reference Signal (RS) signals) For a better downlink transmission beam (DL Tx Beam), the UE needs to inform the network device of the DL Tx Beam selected by the UE when performing random access.

In the existing 3rd Generation Partnership Project (3GPP) system, different DL Tx Beams can indicate different physical random access channels (PRACH) resources and Sequence, that is, PRACH resources and / or sequences are grouped, and different groups correspond to different DL Tx Beams. If the UE selects the best DL Tx beam based on the measurement results of some signals in the synchronous signal block (SS block), it selects a PRACH preamble from its corresponding group for transmission. The time-frequency resource and / or sequence of the received PRACH preamble may determine the best DL Tx Beam selected by the UE.

When the UE does not receive a valid corresponding Random Access Response (RAR) sent by the network device within the corresponding time window, for example, the network device does not receive a preamble, or the network device sends a RAR, and the terminal device If not received, the UE will reselect a preamble to transmit again according to a preset rule until a valid corresponding RAR is received or the maximum number of transmissions specified by the system is reached. When the corresponding RAR is not successfully received after reaching the maximum number of transmissions, the UE notifies the upper layer.

However, in a 5G / NR multi-beam system, the UE may include multiple uplink transmission beams (UL Tx Beam). Therefore, when the preamble is retransmitted, the question of how to select the beam may be faced. Therefore, the existing preamble retransmission mechanism Will not be applicable to the needs of this type of UE.

The present application provides a method and a terminal device for sending a random access preamble, which can reduce the probability of preamble collision and reduce transmission delay.

According to a first aspect, a method for transmitting a random access preamble is provided. The method includes: a terminal device sends a first random access preamble to a network device through a first transmission beam; and the terminal device determines that the first random access preamble is sent. In the case of failure, the terminal device sends a second random access preamble to the network device through a second sending beam, and the first sending beam is different from the second sending beam.

Therefore, in the method for sending a random access preamble according to the embodiment of the present application, if the terminal device fails to send the first random access preamble through the first sending beam, the terminal device may switch the sending beam to resend the random access preamble, that is, the same as the first A second transmission beam with a different transmission beam is transmitted again, thereby reducing the probability of collision of the random access preamble, thereby reducing transmission delay.

It should be understood that, in a case where the sending of the first random access preamble fails, the terminal device may determine to switch or not switch the transmission beam to resend the random access preamble. Specifically, the terminal device may determine not to switch the transmission beam, and then still send the second random access preamble through the first transmission beam, where the second random access preamble may be determined by the terminal device according to a preset condition; the terminal device also It may be determined that the transmission beam is switched, and the terminal device may send a second random access preamble to the network device through a second transmission beam, where the first transmission beam is different from the second transmission beam.

With reference to the first aspect, in an implementation manner of the first aspect, before the terminal device sends the second random access preamble to the network device through the second transmission beam, the method further includes: the terminal device receives the network device transmission A third indication message, which is used to instruct the terminal device to switch the first transmission beam when the first random access preamble transmission fails.

It should be understood that the terminal device may determine, according to the third instruction message sent by the network device, to switch the first transmission beam when the transmission of the first random access preamble fails.

Optionally, the third indication message may further instruct the terminal device not to switch the first transmission beam when the first random access preamble transmission fails.

Optionally, the third indication message may further instruct the terminal device to determine whether to switch the first transmission beam by itself when the first random access preamble transmission fails.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the first random access preamble is the same as the second random access preamble.

Optionally, the terminal device may also determine whether to switch the random access preamble when the transmission beam is switched. Specifically, when the terminal device determines not to switch the random access preamble, it may directly use the first random access preamble, that is, make the second random access preamble the same as the first random access preamble.

With reference to the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, before the terminal device sends a second random access preamble to the network device through a second transmission beam, the method further includes: the terminal The device receives a first instruction message sent by the network device, and the first instruction message is used to instruct the terminal device not to switch the first random access preamble when the sending of the first random access preamble fails.

It should be understood that the terminal device may determine not to switch the first random access preamble according to the first instruction message sent by the network device.

With reference to the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, before the terminal device sends a second random access preamble to the network device through a second transmission beam, the method further includes: the terminal The device determines that the second transmission beam has not transmitted the first random access preamble.

It should be understood that the terminal device may determine whether the second transmission beam has transmitted the first random access preamble, and if it has not yet been transmitted, it may not switch the random access preamble, that is, the second random transmitted through the second transmission beam The access preamble is the same as the first random access preamble.

Optionally, if the terminal device determines that the second sending beam has not sent the first random access preamble, it may also choose to switch the random access preamble, that is, the second random access preamble sent through the second sending beam is the terminal device Determined according to preset conditions.

With reference to the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, before the terminal device sends a second random access preamble to the network device through a second transmission beam, the method further includes: the terminal The device determines the second random access preamble according to a preset condition.

Optionally, the terminal device may also determine whether to switch the random access preamble when the transmission beam is switched. Specifically, when the terminal device determines to switch the random access preamble, the second random access preamble sent by the terminal device through the second beam may be determined by the terminal device according to a preset condition.

With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, before the terminal device determines the second random access preamble according to a preset condition, the method further includes: the terminal device receives the network A second indication message sent by the device, the second indication message is used to instruct the terminal device to switch the first random access preamble when the sending of the first random access preamble fails.

With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, before the terminal device determines the second random access preamble according to a preset condition, the method further includes: the terminal device determines the first random access preamble. The two sending beams have sent the first random access preamble.

With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the preset condition is: randomly selecting a random access preamble in a pre-configured random preamble subset.

With reference to the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the first random access preamble and the second random access preamble belong to a same random preamble subset.

Optionally, the first random access preamble and the second random access preamble may be located in the same or different random preamble subsets, and the random preamble subset may be pre-configured for the terminal device by the network device. Specifically, the network device may configure one or more random preamble subsets for the terminal device, and the random preamble subset may correspond to a transmission beam of the network device.

With reference to the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the terminal device sends a second random access preamble to the network device through a second sending beam, including: the terminal device determines to send the first random access preamble. When the first transmit power during a random access preamble meets a power preset condition, the second random access preamble is sent to the network device through the second sending beam.

It should be understood that when the terminal device sends the first random access preamble by using the first sending beam, the first transmission power may be used. When the sending of the first random access preamble fails, the terminal device sends the random access preamble again, for example, through the second When the transmission beam transmits the second random access preamble, a second transmission power may be used, the second transmission power is greater than or equal to the first transmission power, and the second transmission power is less than or equal to the maximum transmission power.

It should be understood that the terminal device may determine whether to switch the transmission beam according to the transmission power, and may also determine whether to switch the random access preamble. For example, a power preset condition and a corresponding rule may be formulated according to the transmission power. When the terminal device fails to send a random access preamble, the corresponding rule is determined according to whether the power preset condition is satisfied.

With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the power preset condition includes: the first transmission power is less than a preset maximum power, and / or, the first transmission power is equal to the Preset maximum power.

With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, a rule corresponding to the power preset condition may include whether to switch a transmission beam, or may also include whether to switch a random access preamble, and may further include Determine whether to switch the transmission beam and whether to switch the random access preamble according to the beam correspondence of the terminal device.

For example, the power preset condition may be set as follows: the transmission power is equal to the maximum transmission power, and the corresponding rule may be set as: a switching transmission beam and a random access preamble. Specifically, the terminal device sends the first random access preamble through the first transmission beam, and adopts the first transmission power. When the first random access preamble fails to transmit, if the first transmission power is equal to the maximum transmission power, the terminal device Determine to execute the corresponding rule, switch the transmission beam and the random access preamble, that is, send the second random access preamble through the second transmission beam. The second transmission beam is different from the first transmission beam. The second random access preamble is determined by the terminal device according to The predetermined conditions are determined.

For another example, the power preset condition may be set as: the transmission power is equal to the maximum transmission power, and the corresponding rule may be set as: if the beam correspondence of the terminal device is not established, the transmission beam is switched. Specifically, the terminal device sends the first random access preamble through the first transmission beam, and adopts the first transmission power. When the first random access preamble fails to transmit, when the terminal device determines that the first transmission power is equal to the maximum transmission power, The terminal device determines whether the correspondence is established. If the correspondence is not established, the transmission device and the random access preamble are switched, that is, the second random access preamble is transmitted through the second transmission beam, and the second transmission beam and the first transmission beam are transmitted. Differently, the second random access preamble is determined by the terminal device according to a preset condition.

With reference to the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the method further includes: the terminal device does not receive a random access corresponding to the first random access preamble within a preset time. When receiving the response RAR, it is determined that the sending of the first random access preamble fails.

With reference to the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the correspondence of the beams of the terminal device is not established.

Therefore, in the method for sending a random access preamble according to the embodiment of the present application, if the terminal device fails to send the first random access preamble through the first sending beam, the terminal device may switch the sending beam to resend the random access preamble, that is, the same A second transmission beam with a different transmission beam is transmitted again, thereby reducing the probability of collision of the random access preamble, thereby reducing transmission delay.

In a second aspect, a terminal device is provided for performing the foregoing first aspect or the method in any possible implementation manner of the first aspect. Specifically, the terminal device includes a unit for performing the foregoing first aspect or the method in any possible implementation manner of the first aspect.

According to a third aspect, a terminal device is provided, including: a storage unit and a processor, where the storage unit is configured to store instructions, the processor is configured to execute instructions stored in the memory, and when the processor executes the instructions stored in the memory, This execution causes the processor to execute the method of the first aspect or any possible implementation of the first aspect.

In a fourth aspect, a computer-readable medium is provided for storing a computer program, the computer program including instructions for executing the first aspect or the method in any possible implementation of the first aspect.

According to a fifth aspect, a computer program product including instructions is provided. When the computer runs the fingers of the computer program product, the computer executes the first aspect or any possible implementation manner of the first aspect to send random information. Method of accessing the preamble. Specifically, the computer program product can run on the terminal device of the first aspect.

The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

It should be understood that the technical solutions in the embodiments of the present application can be applied to various communication systems, for example: a Global System of Mobile Communication (GSM) system, a Code Division Multiple Access (CDMA) system, and a broadband code division Multiple Access (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system , LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), or Worldwide Interoperability for Microwave Access (WiMAX) communication system.

In the embodiment of the present application, the terminal device may include, but is not limited to, a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), a mobile phone (Mobile Telephone), a UE, a mobile phone (handset), and portable equipment (portable equipment) , Vehicles, etc., the terminal device can communicate with one or more core networks via the Radio Access Network (RAN). For example, the terminal device can be a mobile phone (or a "cellular" phone) , Computers with wireless communication functions, etc., the terminal device may also be a portable, pocket-sized, handheld, computer-built or vehicle-mounted mobile device.

The network device involved in the embodiment of the present application is a device that is deployed in a wireless access network to provide a wireless communication function for a terminal device. The network device may be a base station, and the base station may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems using different wireless access technologies, the names of devices with base station capabilities may vary. For example, in an LTE network, it is called an Evolved NodeB (eNB or eNodeB), and in a 3rd Generation (3G) network, it is called a Node B (Node B) and so on.

FIG. 1 shows a schematic flowchart of a method 100 for sending a random access preamble according to an embodiment of the present application. The method 100 may be executed by a terminal device. As shown in FIG. 1, the method 100 includes:

S110. The terminal device sends the first random access preamble to the network device through the first sending beam.

S120. In a case where the terminal device determines that the sending of the first random access preamble fails, the terminal device sends a second random access preamble to the network device through a second sending beam, the first sending beam and the second sending The beams are different.

Therefore, in the method for sending a random access preamble according to the embodiment of the present application, if the terminal device fails to send the first random access preamble through the first sending beam, the terminal device may switch the sending beam to resend the random access preamble, that is, the same as the first A second transmission beam with a different transmission beam is transmitted again, thereby reducing the probability of collision of the random access preamble, thereby reducing transmission delay.

In the embodiment of the present application, the terminal device sends a random access preamble, that is, the preamble in PRACH, to the network device, and after the network device successfully receives it, the RAR is returned to the terminal device. If the terminal device does not receive a valid RAR within the corresponding time window, for example, no RAR is received, or the identifier in the received RAR does not match, the terminal device may re-send a random access preamble to the network device. , And the statistics of the number of times the terminal sends a preamble increases by one. When the number of times the terminal device transmits the preamble reaches the maximum number of times and the corresponding effective RAR is not received, the upper layer is notified.

In this embodiment of the present application, the terminal device may include multiple transmission beams. For example, the multiple transmission beams may include a first transmission beam and a second transmission beam. When the terminal device fails to send the first random access preamble by using the first sending beam, the terminal device may switch the sending beam. For example, when switching from the first sending beam to the second sending beam, the second random access is sent through the second sending beam. The preamble, where the first random access preamble and the second random access preamble may be the same random access preamble, or may be different random access preambles.

It should be understood that, in the embodiment of the present application, the terminal device sends the random access preamble to the network device. For example, the first random access preamble is sent to the network device through the first transmission beam. After the network device successfully receives the RAR, the terminal device returns the RAR. If the terminal device does not receive a valid RAR within a preset time, for example, within the corresponding time window, for example, the terminal device sends the first random access preamble without receiving the RAR, or the received RAR The identifiers do not match, that is, the received RAR is not the RAR corresponding to the first random access preamble, and the terminal device may determine that the sending of the random access preamble fails.

It should be understood that if the terminal device fails to send the first random access preamble, the terminal device may determine to switch or not switch the transmission beam to resend the random access preamble. Specifically, the terminal device may determine whether to switch the transmission beam by itself, or may receive an instruction message sent by the network device, and determine whether to switch the transmission beam according to the instruction message. For example, the terminal device may receive a third instruction message sent by the network device, and determine whether to switch the transmission beam according to the third instruction message.

Specifically, the terminal device may determine not to switch the transmission beam when the first random access preamble transmission sent by the first transmission beam fails, for example, the terminal device determines to not switch the transmission beam by itself; or the terminal device receives the transmission from the network device A third instruction message indicating that the terminal device does not switch the transmission beam; or the third instruction message instructs the terminal device to determine whether to switch itself, and the terminal device determines not to switch the transmission beam. The terminal device determines not to switch the transmission beam, and then still sends the second random access preamble through the first transmission beam, where the second random access preamble may be determined by the terminal device according to a preset condition.

Optionally, the terminal device may also determine to switch the transmission beam when the transmission of the first random access preamble sent by the first transmission beam fails, for example, the terminal device determines the switching transmission beam by itself; or the terminal device receives the transmission from the network device A third instruction message, the third instruction message instructs the terminal device to switch the transmission beam; or the third instruction message instructs the terminal device to determine whether to switch itself, and the terminal device then determines to switch the transmission beam. If the terminal device determines to switch the transmission beam, the terminal device may send a second random access preamble to the network device through a second transmission beam, where the first transmission beam is different from the second transmission beam.

In addition, the terminal device may also determine whether to switch the random access preamble when the transmission beam is switched. Specifically, the terminal device may determine whether to switch the random access preamble by itself, or may also receive an instruction message sent by the network device, and determine whether to switch the random access preamble according to the instruction message. For example, the terminal device may receive a first instruction message sent by the network device, and determine not to switch the random access preamble according to the first instruction message. For another example, the terminal device may receive a second instruction message sent by the network device, and determine to switch the random access preamble according to the second instruction message. For another example, the terminal device may also receive a fourth instruction message sent by the network device, and according to the fourth instruction message, the terminal device itself determines whether to switch the random access preamble.

Specifically, the terminal device may determine whether to switch the random access preamble by itself. For example, when the terminal device determines that the first random access preamble sent by the first transmission beam fails to be transmitted, the terminal device determines that the transmission beam needs to be switched, that is, the first Two transmission beams, the terminal device may determine whether the second transmission beam has transmitted the first random access preamble.

When the terminal device has sent the first random access preamble through the second sending beam, the terminal device determines to switch the first random access preamble, that is, sends the second random access preamble through the second sending beam, and the second The random access preamble is determined by the terminal device according to a preset condition.

When the terminal device has not sent the first random access preamble through the second sending beam, the terminal device may choose not to switch the random access preamble and continue to use the first random access preamble, that is, send the second random access preamble through the second sending beam. Random access preamble, the second random access preamble is the first random access preamble; or, the terminal device may also choose to switch the random access preamble, the second random access preamble is determined by the terminal device according to a preset condition of.

Optionally, the terminal device may also receive an instruction message sent by the network device. For example, the terminal device receives a first instruction message sent by the network device, where the first instruction message indicates that the terminal device does not switch the random access preamble, and the terminal device determines When the sending of the first random access preamble sent by the first sending beam fails, the first random access preamble can be directly used according to the first indication message, that is, the second random access preamble is made the same as the first random access preamble.

For another example, when the terminal device receives a second instruction message sent by the network device, the second instruction message instructs the terminal device to switch the random access preamble, and when the terminal device determines that the sending of the first random access preamble sent by the first sending beam fails, According to the second instruction message, the terminal device sends the second random access preamble through the second beam, and the second random access preamble is determined by the terminal device according to a preset condition.

For another example, the terminal device receives a fourth instruction message sent by the network device, and the fourth instruction message instructs the terminal device to determine whether to switch the random access preamble by itself, and then the terminal device determines to send When it fails, it is determined whether to switch the random access preamble according to the fourth instruction message.

It should be understood that the terminal device determines the second random access preamble according to a preset condition, and the preset condition may include that the terminal device randomly selects a random access preamble as the second random access preamble in a pre-configured random preamble subset.

Optionally, the first random access preamble and the second random access preamble may be located in the same or different random preamble subsets, and the random preamble subset may be pre-configured for the terminal device by the network device. Specifically, the network device may configure one or more random preamble subsets for the terminal device, and the random preamble subset may correspond to a transmission beam of the network device. If the terminal device determines the best DL Tx Beam, it can determine a random preamble subset corresponding to the DL Tx Beam, and then the first random access preamble and the second random access preamble can be randomly selected in the random preamble subset. Choice, that is, the first random access preamble and the second random access preamble may be located in the same random preamble subset, but the embodiment of the present application is not limited thereto.

In the embodiment of the present application, when the terminal device fails to send the first random access preamble sent through the first transmission beam, specifically, the terminal device may receive a third instruction message sent by the network device, and when the third instruction When the message indicates that the terminal device does not switch the transmission beam, the terminal device still sends the second random access preamble through the first transmission beam when the first random access preamble sent by the first transmission beam fails to send, and the second random access The access preamble is determined by the terminal device according to a preset condition.

It should be understood that the terminal device in the embodiment of the present application may include multiple beams, and the beam correspondence of the terminal device may or may not be established. The terminal device may determine whether to switch the transmission beam according to the beam correspondence.

For example, when the beam correspondence of the terminal device is established, the uplink transmission beam of the terminal device corresponds to the downlink reception beam. When the terminal device sends the first random access preamble through the first transmission beam, the first transmission beam may be the terminal device. It is determined according to the best DL Tx Beam, and when the first random access preamble of the terminal device fails to send, it may choose not to switch the transmission beam and still send the second random access preamble through the first transmission beam.

For another example, when the beam correspondence of the terminal device is not established, and the uplink transmission beam of the terminal device does not correspond to the downlink reception beam, the terminal device may choose to switch the transmission beam when it fails to send the first random access preamble through the first transmission beam. The second sending beam sends a second random access preamble.

In the embodiment of the present application, when a terminal device sends a random access preamble to a network device through a transmission beam, each transmission increases transmission power until the maximum transmission power is reached. For example, when the terminal device sends the first random access preamble through the first transmission beam, the first transmission power may be used. When the first random access preamble fails to be sent, the terminal device sends the random access preamble again, for example, through the second transmission. When the beam transmits the second random access preamble, a second transmission power may be used, the second transmission power is greater than or equal to the first transmission power, and the second transmission power is less than or equal to the maximum transmission power.

It should be understood that the terminal device may determine whether to switch the transmission beam according to the transmission power, and may also determine whether to switch the random access preamble. For example, a power preset condition and a corresponding rule may be formulated according to the transmission power. When the terminal device fails to send a random access preamble, the corresponding rule is determined according to whether the power preset condition is satisfied. For example, the power preset condition may be that the transmission power is less than the maximum transmission power, or equal to the maximum transmission power; the rule may include whether to switch the transmission beam, or may also include whether to switch the random access preamble, or may include the beam according to the terminal device The correspondence determines whether to switch the transmission beam and whether to switch the random access preamble, but the embodiment of the present application is not limited thereto.

For example, the power preset condition may be set as follows: the transmission power is equal to the maximum transmission power, and the corresponding rule may be set as: a switching transmission beam and a random access preamble. Specifically, the terminal device sends the first random access preamble by using the first transmission beam, and adopts the first transmission power. When the transmission of the first random access preamble fails, the terminal device determines whether the first transmission power satisfies a power preset condition. That is, whether the first transmission power is equal to the maximum transmission power. If it is not equal, the terminal device can determine whether to switch the transmission beam and the random access preamble by itself, or determine through other methods; if it is equal, the terminal device determines to execute the corresponding rule. , Switch the transmission beam and the random access preamble, that is, send the second random access preamble through the second transmission beam. The second transmission beam is different from the first transmission beam. The second random access preamble is determined by the terminal device according to a preset condition. .

For another example, the power preset condition may be set as: the transmission power is equal to the maximum transmission power, and the corresponding rule may be set as: if the beam correspondence of the terminal device is not established, the transmission beam is switched. Specifically, the terminal device sends the first random access preamble by using the first transmission beam, and adopts the first transmission power. When the transmission of the first random access preamble fails, the terminal device determines whether the first transmission power satisfies a power preset condition. That is, whether the first transmission power is equal to the maximum transmission power. If it is not equal, the terminal device can determine whether to switch the transmission beam and the random access preamble by itself, or determine through other methods; if it is equal, the terminal device determines to execute the corresponding rule. : The terminal device determines whether the correspondence is established. If the correspondence is established, it is still possible to determine whether to switch the transmission beam and the random access preamble, or to determine it by other methods. If the correspondence is not established, the transmission beam and the random access are switched. Incoming preamble, that is, sending the second random access preamble through the second sending beam. The second sending beam is different from the first sending beam. The second random access preamble is determined by the terminal device according to a preset condition.

It should be understood that the terminal device may formulate different power preset conditions and corresponding rules according to the transmission power, and is not limited to the above embodiments, and will not be enumerated one by one in the following.

Therefore, in the method for sending a random access preamble according to the embodiment of the present application, if the terminal device fails to send the first random access preamble through the first sending beam, the terminal device may switch the sending beam to resend the random access preamble, that is, the same as the first A second transmission beam with a different transmission beam is transmitted again, thereby reducing the probability of collision of the random access preamble, thereby reducing transmission delay.

It should be understood that, in the various embodiments of the present application, the size of the sequence numbers of the above processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic. The implementation process constitutes any limitation.

The method for sending a random access preamble according to the embodiment of the present application is described in detail above with reference to FIG. 1, and a terminal device for sending a random access preamble according to the embodiment of the present application will be described below with reference to FIGS. 2 to 3.

As shown in FIG. 2, the terminal device 200 according to the embodiment of the present application includes:

A sending unit 210, configured to send a first random access preamble to a network device through a first sending beam;

The sending unit 210 is further configured to: when the terminal device determines that the sending of the first random access preamble fails, the terminal device sends a second random access preamble to the network device through a second sending beam, and the first sending The beam is different from the second transmission beam.

Therefore, if the terminal device in the embodiment of the present application fails to send the first random access preamble by using the first sending beam, the terminal device may switch the sending beam and resend the random access preamble, that is, use a second different from the first sending beam. The transmission beam is transmitted again, thereby reducing the probability of collision of the random access preamble, thereby reducing transmission delay.

Optionally, the first random access preamble is the same as the second random access preamble.

Optionally, the terminal device further includes: a receiving unit 220, configured to receive a first instruction message sent by the network device before the sending unit 210 sends a second random access preamble to the network device through a second sending beam, The first indication message is used to instruct the terminal device not to switch the first random access preamble when the sending of the first random access preamble fails.

Optionally, the terminal device further includes: a determining unit 230, configured to determine that the second sending beam has not sent the first transmission beam before the terminal device sends the second random access preamble to the network device through the second sending beam. Random access preamble.

Optionally, the determining unit 230 is further configured to: before the sending unit 210 sends the second random access preamble to the network device through the second sending beam, the terminal device determines the second random access preamble according to a preset condition. .

Optionally, the receiving unit is further configured to: before the determining unit 230 determines the second random access preamble according to a preset condition, receive a second instruction message sent by the network device, where the second instruction message is used to indicate the When the terminal device fails to send the first random access preamble, the terminal device switches the first random access preamble.

Optionally, the determining unit 230 is specifically configured to: before determining the second random access preamble according to a preset condition, determine that the second sending beam has sent the first random access preamble.

Optionally, the preset condition is: randomly selecting a random access preamble in a pre-configured random preamble subset.

Optionally, the first random access preamble and the second random access preamble belong to the same random preamble subset.

Optionally, the sending unit 210 is specifically configured to: when the first transmit power when sending the first random access preamble meets a power preset condition, send the second to the network device through the second sending beam Random access preamble.

Optionally, the power preset condition includes that the first transmit power is less than a preset maximum power, and / or the first transmit power is equal to the preset maximum power.

Optionally, the determining unit 230 is further configured to: when the random access response RAR corresponding to the first random access preamble is not received within a preset time, determine that the sending of the first random access preamble fails.

Optionally, the correspondence of the beams of the terminal device is not established.

Optionally, the receiving unit 220 is further configured to: before the sending unit 210 sends the second random access preamble to the network device through the second sending beam, receive a third instruction message sent by the network device, and the third instruction The message is used to instruct the terminal device to switch the first transmission beam when the first random access preamble transmission fails.

It should be understood that the terminal device 200 according to the embodiment of the present application may correspond to executing the method 100 in the embodiment of the present application, and the above and other operations and / or functions of each unit in the terminal device 200 are respectively to implement each of FIG. 1. The corresponding process of the terminal device in the method is omitted here for brevity.

Therefore, if the terminal device in the embodiment of the present application fails to send the first random access preamble by using the first sending beam, the terminal device may switch the sending beam and resend the random access preamble, that is, use a second different from the first sending beam The transmission beam is transmitted again, thereby reducing the probability of collision of the random access preamble, thereby reducing transmission delay.

FIG. 3 shows a schematic block diagram of a terminal device 300 according to an embodiment of the present application. As shown in FIG. 3, the terminal device 300 includes: a processor 310 and a transceiver 320, and the processor 310 and the transceiver 320 are connected, and may Optionally, the terminal device 300 further includes a memory 330, and the memory 330 is connected to the processor 310. Among them, the processor 310, the memory 330, and the transceiver 320 communicate with each other through an internal connection path, and transfer control and / or data signals. The memory 330 can be used to store instructions, and the processor 310 is used to execute the memory stored by the memory 330. An instruction to control the transceiver 320 to send a message or signal, the transceiver 320 is configured to: send a first random access preamble to a network device through a first transmission beam; and determine, at the terminal device, that the first random access preamble fails to be sent. In this case, the terminal device sends a second random access preamble to the network device through a second sending beam, and the first sending beam is different from the second sending beam.

Therefore, if the terminal device in the embodiment of the present application fails to send the first random access preamble by using the first sending beam, the terminal device may switch the sending beam and resend the random access preamble, that is, use a second different from the first sending beam. The transmission beam is transmitted again, thereby reducing the probability of collision of the random access preamble, thereby reducing transmission delay.

Optionally, the first random access preamble is the same as the second random access preamble.

Optionally, the transceiver 320 is configured to: before sending the second random access preamble to the network device through the second sending beam, receive a first instruction message sent by the network device, where the first instruction message is used to indicate the When the terminal device fails to send the first random access preamble, the terminal device does not switch the first random access preamble.

Optionally, the processor 310 is configured to: before the terminal device sends the second random access preamble to the network device through the second sending beam, determine that the second sending beam has not sent the first random access preamble.

Optionally, the processor 310 is configured to: before the transceiver 320 sends the second random access preamble to the network device through the second sending beam, the terminal device determines the second random access preamble according to a preset condition.

Optionally, the transceiver 320 is configured to: before the processor 310 determines the second random access preamble according to a preset condition, receive a second instruction message sent by the network device, where the second instruction message is used to indicate the When the terminal device fails to send the first random access preamble, the terminal device switches the first random access preamble.

Optionally, the processor 310 is configured to: before determining the second random access preamble according to a preset condition, determine that the second sending beam has sent the first random access preamble.

Optionally, the preset condition is: randomly selecting a random access preamble in a pre-configured random preamble subset.

Optionally, the first random access preamble and the second random access preamble belong to the same random preamble subset.

Optionally, the transceiver 320 is configured to: when the first transmit power when sending the first random access preamble meets a power preset condition, send the second random to the network device through the second sending beam Access preamble.

Optionally, the power preset condition includes that the first transmit power is less than a preset maximum power, and / or the first transmit power is equal to the preset maximum power.

Optionally, the processor 310 is configured to: when a random access response RAR corresponding to the first random access preamble is not received within a preset time, determine that the sending of the first random access preamble fails.

Optionally, the correspondence of the beams of the terminal device is not established.

Optionally, the transceiver 320 is configured to: before sending the second random access preamble to the network device through the second sending beam, receive a third instruction message sent by the network device, where the third instruction message is used to indicate the When the terminal device fails to send the first random access preamble, the terminal device switches the first transmission beam.

It should be understood that the terminal device 300 according to the embodiment of the present application may correspond to the terminal device 200 in the embodiment of the present application, and may correspond to the corresponding subject in executing the method 100 according to the embodiment of the present application, and each of the terminal devices 300 The above and other operations and / or functions of the unit are respectively to implement the corresponding process of the terminal device in each method in FIG. 1, and for the sake of brevity, they are not repeated here.

Therefore, if the terminal device in the embodiment of the present application fails to send the first random access preamble by using the first sending beam, the terminal device may switch the sending beam and resend the random access preamble, that is, use a second different from the first sending beam. The transmission beam is transmitted again, thereby reducing the probability of collision of the random access preamble, thereby reducing transmission delay.

It should be noted that the foregoing method embodiments of the present application may be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method embodiments may be completed by using hardware integrated logic circuits or instructions in the form of software in a processor. The above processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA), or other Programming logic devices, discrete gate or transistor logic devices, discrete hardware components. Various methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. A general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module may be located in a mature storage medium such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electronic erasable programmable memory, a register, and the like. The storage medium is located in the memory, and the processor reads the messages in the memory and completes the steps of the foregoing method in combination with its hardware.

It can be understood that the memory in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (Erasable PROM, EPROM), and an electronic wipe. Division programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be a Random Access Memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (Synchlink DRAM, SLDRAM ) And direct memory bus random access memory (Direct Rambus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

It should be understood that the term "and / or" in this document is only an association relationship describing an associated object, which means that there can be three kinds of relationships, for example, A and / or B can mean: A exists alone, A and B exist simultaneously, alone There are three cases of B. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

Those having ordinary knowledge in the technical field may realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

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

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined or may be combined. Integration into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, which may be electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objective of the solution of this embodiment.

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

When the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application is essentially a part that contributes to the existing technology or a part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several The instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: USB hard disks, removable hard disks, Read-Only Memory (ROM), Random Access Memory (RAM), magnetic disks, or optical disks, which can store program codes. medium.

The above is only a specific implementation of this application, but the scope of protection of this application is not limited to this. Any person with ordinary knowledge in the technical field can easily think of changes or replacements within the technical scope disclosed in this application. It should be covered by the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the patent application scope.

200, 300‧‧‧ terminal equipment

100‧‧‧ Method

S110, S120‧‧‧step

210‧‧‧ sending unit

220‧‧‧Receiving unit

230‧‧‧ Confirmation unit

310‧‧‧ processor

320‧‧‧ Transceiver

330‧‧‧Memory

FIG. 1 is a schematic flowchart of a method for sending a random access preamble according to an embodiment of the present application. FIG. 2 is a schematic block diagram of a terminal device according to an embodiment of the present application. FIG. 3 is another schematic block diagram of a terminal device according to an embodiment of the present application.

Claims (10)

A method for transmitting a random access preamble, comprising: a terminal device transmitting a first random access preamble to a network device through a first transmission beam; and a situation where the terminal device determines that the first random access preamble fails to be sent. Next, the terminal device sends a second random access preamble to the network device through a second sending beam, and the first sending beam and the second sending beam are different. The method according to item 1 of the scope of patent application, wherein the first random access preamble is the same as the second random access preamble. The method according to item 2 of the scope of patent application, wherein before the terminal device sends a second random access preamble to the network device through a second transmission beam, the method further includes: receiving, by the terminal device, all The first instruction message sent by the network device is used to instruct the terminal device not to switch the first random access preamble when the first random access preamble fails to be sent. The method according to item 2 of the scope of patent application, wherein before the terminal device sends a second random access preamble to the network device through a second transmission beam, the method further includes: the terminal device determines The second transmission beam has not transmitted the first random access preamble. The method according to item 1 of the scope of patent application, wherein before the terminal device sends a second random access preamble to the network device through a second transmission beam, the method further includes: Set conditions to determine the second random access preamble. The method according to item 5 of the scope of patent application, wherein before the terminal device determines the second random access preamble according to a preset condition, the method further includes: receiving, by the terminal device, the network device sends A second indication message, the second indication message is used to instruct the terminal device to switch the first random access preamble when the sending of the first random access preamble fails. The method according to item 5 of the scope of patent application, wherein before the terminal device determines the second random access preamble according to a preset condition, the method further includes: the terminal device determines the second transmission The beam has transmitted the first random access preamble. The method according to any one of claims 1 to 7, wherein the method further comprises: the terminal device does not receive the first random access preamble corresponding to the first random access preamble within a preset time. When the random access responds to the RAR, it is determined that the sending of the first random access preamble fails. The method according to item 1 of the patent application scope, wherein before the terminal device sends a second random access preamble to the network device through a second transmission beam, the method further includes: receiving, by the terminal device, all The third instruction message sent by the network device is used to instruct the terminal device to switch the first transmission beam when the first random access preamble transmission fails. A terminal device includes: a memory; and a processor configured to execute instructions stored in the memory to cause the terminal device to perform the method described in any one of claims 1 to 9 of a patent application scope.