WO2021134636A1

WO2021134636A1 - Random access method and communication device

Info

Publication number: WO2021134636A1
Application number: PCT/CN2019/130848
Authority: WO
Inventors: 高宽栋; 黄煌; 管鹏; 颜矛
Original assignee: 华为技术有限公司
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2021-07-08
Also published as: CN114830797A

Abstract

A random access method and a communication device. The method comprises: a terminal device sending a message 1 to a network device, wherein the message 1 is associated with a first reference signal; the network device sending a message 2 to the terminal device, wherein the message 2 is associated with the first reference signal; the terminal device sends a message 3 to the network device, wherein the message 3 comprises candidate reference signal information; and the network device determining a second reference signal according to the candidate reference signal information, and sending a message 4 to the terminal device, wherein the message 4 is associated with the second reference signal. Therefore, a suitable reference signal can be selected for transmission, so that uplink information and downlink information can be transmitted using a suitable beam, thereby improving the transmission efficiency and performance.

Description

Random access method and communication device

Technical field

This application relates to the field of communication technology, and in particular to a random access method and communication device.

Background technique

Beamforming (beamforming) technology is used to limit the energy of a transmitted signal within a certain beam direction, thereby enhancing signal strength and improving signal reception efficiency. Beamforming technology can effectively expand the transmission range of wireless signals and reduce signal interference, thereby achieving higher communication efficiency and obtaining higher network capacity.

In a communication system using beamforming technology, for example, the communication system includes a network device and a terminal device. The network device uses a beam to send and receive signals, and the terminal device also uses a beam to send and receive signals. Different beams correspond to different reference signals. How to choose a suitable reference signal for transmission is a technical problem to be solved urgently.

Summary of the invention

The embodiments of the present application provide a random access method and a communication device, which can select a suitable reference signal for transmission, so that a suitable beam can be used for transmission, thereby improving transmission efficiency and performance.

The first aspect of the embodiments of the present application provides a random access method, including:

Send message 1 to the network device, and the message 1 is associated with the first reference signal;

Receiving message 2 from the network device, the message 2 being associated with the first reference signal;

Send a message 3 to the network device, where the message 3 includes candidate reference signal information, and the candidate reference signal information is used to determine the second reference signal; optionally, the message 3 is associated with the first reference signal;

Receiving a message 4 from the network device, the message 4 being associated with the second reference signal;

Wherein, the first reference signal and the second reference signal are synchronization signal blocks and belong to the same synchronization signal block period. In addition to the synchronization signal block, the first reference signal and the second reference signal may also be channel state information reference signals.

The method provided in the first aspect of the embodiments of the present application may be executed by a terminal device, or may be executed by a component of the terminal device (for example, a processor, a chip, or a chip system, etc.). The reference signal associated with message 1 to message 4 is not fixed to a certain reference signal, so that the uplink information and downlink information after message 4 can be associated with different reference signals, and different reference signals are associated with different beams, which can be used appropriately. The beam transmits signals, thereby improving the efficiency and performance of transmission.

In a possible implementation manner, after receiving the message 4 from the network device, it further includes one or more of the following:

(1) Send uplink information to the network device, where the uplink information is associated with the first reference signal;

(2) Receive downlink information from the network device, where the downlink information is associated with the second reference signal;

(3) Send uplink information to the network device, where the uplink information is associated with the second reference signal;

(4) Receive downlink information from the network device, where the downlink information is associated with the first reference signal.

The terminal device can perform one of (1)-(4), or two or more of the four. For example, by executing (1) and (2), the uplink information can be associated with the first reference signal, and the downlink information can be associated with the second reference signal, so that the uplink information can be associated with the appropriate uplink beam or downlink beam, and the downlink information can be associated with the appropriate downlink Beam or uplink beam. For another example, performing (1) and (3) can realize that the uplink information is associated with the first reference signal at a certain time, and the uplink information is associated with the second reference signal at another time, so that the beam associated with the uplink information can be flexibly selected.

In a possible implementation, message 2 can be used to indicate the reference signal associated with message 3, and can indicate that the reference signal associated with message 3 is the first reference signal, so that the terminal device can use the first reference signal when sending message 3 The corresponding beam.

In a possible implementation manner, the terminal device may determine the first reference signal before sending the message 1 to the network device, so that the terminal device can send the message 1 using the beam corresponding to the first reference signal. The terminal device may determine the first reference signal from the multiple reference signals according to the measurement result of each reference signal and/or the back-off power corresponding to each reference signal. The measurement result may include the received power of the reference signal and/or the signal-to-noise ratio of layer 1. The back-off power refers to the amount by which the transmit power is reduced.

In a possible implementation manner, the terminal device may also select the second reference signal before sending the message 1 to the network device, so that the terminal device carries the index of the second reference signal in the message 3. The terminal device may select the second reference signal from the multiple reference signals according to the measurement result of each reference signal and/or the backoff power corresponding to each reference signal.

The random access timing for selecting the first reference signal and the random access timing for selecting the second reference signal may be different. For example, the first reference signal is selected at random access timing 1, and the second reference is selected at random access timing 2. signal.

The method of selecting the first reference signal and the method of selecting the second reference signal may be the same or different. For example, according to the reference signal received power of each reference signal and the back-off power of each reference signal, the first reference signal is selected from a plurality of reference signals; according to the signal-to-noise ratio of each reference signal of the layer one, the first reference signal is selected from the plurality of reference signals Select the second reference signal.

In a possible implementation, the candidate reference signal information included in the message 3 may include one or more of the following: path loss information, the index of the second reference signal, the back-off power corresponding to the reference signal, and the measurement result of the reference signal . The path loss information, the back-off power corresponding to the reference signal, and the measurement result of the reference signal can be used by the network device to determine the second reference signal.

The second aspect of the embodiments of the present application provides a random access method, including:

Receiving message 1 from the terminal device, the message 1 being associated with the first reference signal;

Send message 2 to the terminal device, where the message 2 is associated with the first reference signal;

Receiving a message 3 from the terminal device, the message 3 including candidate reference signal information; optionally, the message 3 is associated with the first reference signal;

Determine the second reference signal according to the candidate reference signal information;

Sending a message 4 to the terminal device, where the message 4 is associated with the second reference signal;

The method provided in the second aspect of the embodiments of the present application may be executed by a network device, or may be executed by a component of the network device (for example, a processor, a chip, or a chip system, etc.). The reference signal associated with message 1 to message 4 is not fixed to a certain reference signal, so that the uplink information and downlink information after message 4 can be associated with different reference signals, and different reference signals are associated with different beams, which can be used appropriately. The beam transmits signals, thereby improving the efficiency and performance of transmission.

The method provided in the second aspect corresponds to the method provided in the first aspect, and reference may be made to the description of various implementation manners in the first aspect.

In a possible implementation manner, if the candidate reference signal information includes path loss information, the network device may determine the second reference signal according to the path loss information. If the candidate reference signal information includes the index of the second reference signal, the network device can directly determine the second reference signal. If the candidate reference signal information includes the measurement result of each reference signal, the network device may determine the second reference signal from the multiple reference signals according to the measurement result of each reference signal. If the candidate reference signal information includes the back-off power corresponding to each reference signal, the network device may determine the second reference signal from the multiple reference signals according to the back-off power corresponding to each reference signal. If the candidate reference signal information includes the measurement result of each reference signal and the back-off power corresponding to each reference signal, the network device may determine the second reference signal from the multiple reference signals according to the measurement result and the back-off power.

The third aspect of the embodiments of the present application provides a random access method, including:

Sending a message A to the network device, where the message A is associated with the first reference signal; the message A includes candidate reference signal information, and the candidate reference signal information is used to determine the second reference signal;

Receiving a message B from the network device, where the message B is associated with the second reference signal;

The method provided in the third aspect of the embodiments of the present application may be executed by a terminal device, or may be executed by a component of the terminal device (for example, a processor, a chip, or a chip system, etc.). The reference signal associated with message A and message B is not fixed to a certain reference signal, so that the uplink information and downlink information after message B can be associated with different reference signals, and different reference signals are associated with different beams, which can be used appropriately The beam transmits signals, thereby improving the efficiency and performance of transmission.

In a possible implementation manner, after receiving the message B from the network device, it further includes one or more of the following:

The terminal device can perform one of (1)-(4), or two or more of the four.

In a possible implementation, the candidate reference signal information included in the message A may include one or more of the following: path loss information, the index of the second reference signal, the back-off power corresponding to the reference signal, and the measurement result of the reference signal . The path loss information, the back-off power corresponding to the reference signal, and the measurement result of the reference signal can be used by the network device to determine the second reference signal.

The fourth aspect of the embodiments of the present application provides a random access method, including:

Receiving a message A from a terminal device, the message A being associated with the first reference signal; the message A including candidate reference signal information;

Sending a message B to the terminal device, where the message B is associated with the second reference signal;

The method provided by the fourth aspect of the embodiments of the present application may be executed by a network device, or may be executed by a component of the network device (for example, a processor, a chip, or a chip system, etc.). The reference signal associated with message A and message B is not fixed to a certain reference signal, so that the uplink information and downlink information after message B can be associated with different reference signals, and different reference signals are associated with different beams, which can be used appropriately The beam transmits signals, thereby improving the efficiency and performance of transmission.

The method provided by the fourth aspect corresponds to the method provided by the third aspect, and reference may be made to the description of various implementation manners of the third aspect.

A fifth aspect of the embodiments of the present application provides a communication device. The communication device may be a terminal device, a device in a terminal device, or a device that can be used in combination with the terminal device. The communication device can implement part or all of the functions of the terminal device in the method example described in the first aspect or the third aspect. For example, the function of the terminal device may have some or all of the functions in the embodiments of the present application, or may have The function of any embodiment in this application is implemented separately. This function can be realized by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above-mentioned functions.

In a possible design, the structure of the terminal device may include a processing unit and a communication unit. The processing unit is configured to support the terminal device to perform corresponding functions in the method provided in the first aspect or the third aspect. The communication unit is used to support communication between the terminal device and other devices, and the other devices may be network devices. The terminal device may also include a storage unit, which is used for coupling with the processing unit and the communication unit, and stores the necessary programs/instructions and data of the terminal device.

In one embodiment, the terminal device includes a processing unit and a communication unit;

The processing unit is configured to use the communication unit to send a message 1 to the network device, where the message 1 is associated with the first reference signal; receive a message 2 from the network device, and the message 2 is associated with the first reference signal; and send a message 3 to the network device, The message 3 includes candidate reference signal information, and the candidate reference signal information is used to determine the second reference signal; receiving a message 4 from the network device, and the message 4 is associated with the second reference signal;

Wherein, the first reference signal and the second reference signal are synchronization signal blocks and belong to the same synchronization signal block period.

In another implementation manner, the terminal device includes a processing unit and a communication unit;

The processing unit is configured to use the communication unit to send a message A to the network device, where the message A is associated with the first reference signal; the message A includes candidate reference signal information, and the candidate reference signal information is used to determine the second reference signal; Message B, the message B is associated with the second reference signal;

As an example, the processing unit may be a processor, the communication unit may be a transceiver, and the storage unit may be a memory.

In an implementation manner, the terminal device includes a processor and a transceiver;

The processor is configured to use the transceiver to send a message 1 to the network device, where the message 1 is associated with a first reference signal; receive a message 2 from the network device, and the message 2 is associated with the first reference signal; and send a message 3 to the network device, The message 3 includes candidate reference signal information, and the candidate reference signal information is used to determine the second reference signal; receiving a message 4 from the network device, and the message 4 is associated with the second reference signal;

In another implementation manner, the terminal device includes a processor and a transceiver;

The processor is configured to use the transceiver to send a message A to the network device, where the message A is associated with the first reference signal; the message A includes candidate reference signal information, and the candidate reference signal information is used to determine the second reference signal; Message B, the message B is associated with the second reference signal;

In a specific implementation process, the processor may be used to perform the methods provided in the first aspect or the third aspect, such as but not limited to baseband related processing, and the transceiver may be used to perform, for example, but not limited to, radio frequency transceiving. The above-mentioned devices may be respectively arranged on independent chips, or at least partly or fully arranged on the same chip. For example, the processor can be further divided into an analog baseband processor and a digital baseband processor. Among them, the analog baseband processor can be integrated with the transceiver on the same chip, and the digital baseband processor can be set on a separate chip. With the continuous development of integrated circuit technology, more and more devices can be integrated on the same chip. For example, a digital baseband processor can be combined with a variety of application processors (such as but not limited to graphics processors, multimedia processors, etc.) Integrated on the same chip. Such a chip may be called a system on chip (system on chip) or a chip system, etc. Whether each device is independently arranged on different chips or integrated on one or more chips often depends on the specific requirements of product design. The embodiment of the present application does not limit the specific implementation form of the foregoing device.

A sixth aspect of the embodiments of the present application provides a processor configured to execute the method provided in any one of the foregoing first aspect or third aspect. In the process of executing the method provided by the first aspect or the third aspect, the process of sending the foregoing information or data and receiving the foregoing information or data can be understood as the process of outputting the foregoing information or data by the processor, and the process of receiving the foregoing information or data by the processor. The process of entering the above information or data. Specifically, when outputting the above-mentioned information or data, the processor outputs the above-mentioned information or data to the transceiver for transmission by the transceiver. Furthermore, after the above-mentioned information or data is output by the processor, other processing may be performed before it reaches the transceiver. Similarly, when the processor receives the aforementioned information or data input, the transceiver receives the aforementioned information or data and inputs it into the processor. Furthermore, after the transceiver receives the above-mentioned information or data, the above-mentioned information or data may undergo other processing before being input to the processor.

Based on the foregoing principle, for example, the received message mentioned in the method provided by the foregoing first aspect or the third aspect can be understood as the transceiver inputting the received message into the processor.

In this way, if there are no special instructions for the transmitting, sending, and receiving operations involved in the processor, or if it does not conflict with the actual function or internal logic in the relevant description, it can be understood more generally as The processor outputs and receives, inputs, and other operations, instead of transmitting, sending, and receiving operations performed by radio frequency circuits and antennas.

In a specific implementation process, the foregoing processor may be a processor dedicated to executing these methods, or a processor that invokes computer instructions in a memory to execute these methods, such as a general-purpose processor. The above-mentioned memory may be a non-transitory memory, such as a read only memory (ROM), which may be integrated with the processor on the same chip, or may be separately arranged on different chips. This application The embodiment does not limit the type of the memory and the setting mode of the memory and the processor.

A seventh aspect of the embodiments of the present application provides a chip system. The chip system includes a processor and an interface. The chip system can be deployed in a terminal device.

In a possible design, the processor is configured to send message 1, which is associated with a first reference signal, to the network device through an interface; receive message 2 from the network device, which is associated with the first reference signal; Send a message 3 to the network device, the message 3 including candidate reference signal information, the candidate reference signal information is used to determine the second reference signal; receive a message 4 from the network device, the message 4 is associated with the second reference signal;

In a possible design, the processor is configured to send a message A to the network device through an interface, and the message A is associated with the first reference signal; the message A includes candidate reference signal information, and the candidate reference signal information is used to determine the second reference signal. Reference signal; receiving message B from the network device, the message B is associated with the second reference signal;

An eighth aspect of the embodiments of the present application provides a computer-readable storage medium for storing computer programs/instructions used by the above-mentioned terminal device, which includes those used for executing the method described in the above-mentioned first aspect or the third aspect. Procedures/instructions.

The ninth aspect of the embodiments of the present application provides a computer program product including instructions, which when run on a computer, cause the computer to execute the method described in the first aspect or the third aspect.

The tenth aspect of the embodiments of the present application provides a computer program including instructions, which when run on a computer, causes the computer to execute the method described in the first aspect or the third aspect.

The eleventh aspect of the embodiments of the present application provides a communication device. The communication device may be a network device, a device in a network device, or a device that can be matched and used with the network device. The communication device can implement part or all of the functions of the terminal device in the method example of the second aspect or the fourth aspect. For example, the function of the network device may have some or all of the functions in the embodiments of the present application, or may have The function of any embodiment in this application is implemented separately. This function can be realized by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above-mentioned functions.

In a possible design, the structure of the network device may include a processing unit and a communication unit. The processing unit is configured to support the terminal device to perform the corresponding function in the method provided in the second aspect or the fourth aspect. The communication unit is used to support communication between network devices and other devices, and the other devices may be terminal devices. The network device may also include a storage unit, which is used for coupling with the processing unit and the communication unit, and stores the program instructions and data necessary for the network device.

In one embodiment, the network device includes a processing unit and a communication unit;

A processing unit, a processing unit, configured to use the communication unit to receive a message 1 from a terminal device, where the message 1 is associated with a first reference signal; send a message 2 to the terminal device, where the message 2 is associated with the first reference signal; Receiving message 3 from the terminal device, the message 3 including candidate reference signal information; determining the second reference signal according to the candidate reference signal information; sending a message 4 to the terminal device, the message 4 being associated with the second reference signal;

In another embodiment, the network device includes a processing unit and a communication unit;

The processing unit is configured to use the communication unit to receive a message A from the terminal device, the message A is associated with the first reference signal; the message A includes candidate reference signal information; the second reference signal is determined according to the candidate reference signal information; Send message B, which is associated with the second reference signal;

In one embodiment, the terminal device includes a processor and a transceiver;

The processor is configured to use the transceiver to receive message 1 from the terminal device, where the message 1 is associated with the first reference signal; send message 2 to the terminal device, and the message 2 is associated with the first reference signal; and receive the message 3 from the terminal device , The message 3 includes candidate reference signal information; the second reference signal is determined according to the candidate reference signal information; the message 4 is sent to the terminal device, and the message 4 is associated with the second reference signal;

The processor is configured to use the transceiver to receive a message A from the terminal device, the message A is associated with the first reference signal; the message A includes candidate reference signal information; the second reference signal is determined according to the candidate reference signal information; Send message B, which is associated with the second reference signal;

In a specific implementation process, the processor can be used to perform the methods provided in the second or fourth aspect, such as but not limited to baseband related processing, and the transceiver can be used to perform, for example, but not limited to, radio frequency transceiving. The above-mentioned devices may be respectively arranged on independent chips, or at least partly or fully arranged on the same chip.

A twelfth aspect of the embodiments of the present application provides a processor configured to execute the method provided in the second or fourth aspect.

A thirteenth aspect of the embodiments of the present application provides a chip system. The chip system includes a processor and an interface. The chip system can be deployed in a network device.

In a possible design, the processor is configured to receive a message 1 from a terminal device through an interface, and the message 1 is associated with a first reference signal; send a message 2 to the terminal device, and the message 2 is associated with the first reference signal; Receiving message 3 from the terminal device, the message 3 including candidate reference signal information; determining the second reference signal according to the candidate reference signal information; sending a message 4 to the terminal device, the message 4 being associated with the second reference signal;

In a possible design, the processor is configured to receive a message A from the terminal device through an interface, and the message A is associated with the first reference signal; the message A includes candidate reference signal information; and according to the candidate reference signal information, determine the first reference signal Second reference signal; send a message B to the terminal device, and the message B is associated with the second reference signal;

A fourteenth aspect of the embodiments of the present application provides a computer-readable storage medium for storing computer programs/instructions used by the above-mentioned terminal device, which includes methods for executing the method described in the above-mentioned second or fourth aspect. Procedures/instructions.

The fifteenth aspect of the embodiments of the present application provides a computer program product including instructions, which when run on a computer, causes the computer to execute the method described in the second or fourth aspect.

The sixteenth aspect of the embodiments of the present application provides a computer program including instructions, which when run on a computer, causes the computer to execute the method described in the second or fourth aspect.

Description of the drawings

Figure 1a is a schematic diagram of a four-step random access process based on contention;

Figure 1b is a schematic diagram of a two-step random access process based on contention;

Figure 2 is an example diagram of a synchronization signal block period;

Figure 3 is an example diagram of beam alignment;

Figure 4 is a schematic diagram of a network architecture applying an embodiment of the present application;

FIG. 5 is a schematic flowchart of a random access method provided by an embodiment of this application;

FIG. 6 is an example diagram of beam alignment provided by an embodiment of this application;

Fig. 7 is an example diagram based on Fig. 5;

FIG. 8 is a schematic flowchart of another random access method provided by an embodiment of this application;

Fig. 9 is an example diagram based on Fig. 8;

FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of this application;

FIG. 11 is a schematic structural diagram of another communication device provided by an embodiment of this application;

FIG. 12 is a schematic structural diagram of a chip provided by an embodiment of the application;

FIG. 13 is a schematic structural diagram of a terminal device provided by an embodiment of this application.

Detailed ways

In order to better understand the technical solutions provided by the embodiments of the present application, first introduce the technologies or names involved in the embodiments of the present application.

1. Random access process

The random access process refers to the process from the terminal device sending a random access preamble (random access preamble) to attempting to access the network device to the establishment of a basic signaling connection with the network device. The terminal equipment establishes a connection with the cell through a random access process and obtains uplink synchronization. The random access process can be divided into a contention-based random access process and a non-competition-based random access process. In the contention-based random access process, the random access preamble sequence is generated by the terminal device, and the random access preamble sequence generated by different terminal devices may conflict (that is, use the same random access preamble sequence for access), and the network equipment needs to compete Solve the access of different terminal equipment. In the non-contention-based random access process, the random access preamble sequence is allocated by the network device to the terminal device, which can avoid the random access preamble sequence conflict of different terminal devices. The contention-based random access process can be divided into a contention-based four-step random access process and a contention-based two-step random access process.

(1) Four-step random access process based on competition

For the four-step random access process based on contention, refer to the schematic diagram shown in Figure 1a. In Figure 1a, the terminal device sends a random access preamble sequence to the network device; the network device sends a random access response (RAR) to the terminal device; the terminal device sends a message 3 (message3, Msg3) to the network device; the network device Send message 4 to the terminal device.

Among them, the random access preamble sequence can also be described as message 1 (message1, Msg1) or message 1 carrying random access preamble sequence, etc.; the random access response can also be described as message 2 (message2, Msg2) or message 2 carrying random Access response, etc.; Message 4 can also be described as a contention resolution message or a conflict resolution message.

The terminal device sends the selected random access preamble sequence on the selected physical random access channel (PRACH) occasion, and calculates the temporary random access to the wireless network according to the selected PRACH occasion. Identity (random access radio network temporary identity, RA-RNTI), one PRACH occasion corresponds to one RA-RNTI. When receiving message 2 subsequently, the terminal device monitors its own RA-RNTI scrambled physical downlink control channel (physical downlink control channel, PDCCH), so as to determine that it is the PDCCH sent to itself. After sending the random access preamble sequence, the terminal device monitors the PDCCH in a window. The PDCCH will indicate the location of the physical downlink shared channel (PDSCH), and the PDSCH includes the RAR. Message 3 may include the identification of the terminal device, which is used for contention resolution. For the terminal device in the connected state, the identification may be a cell radio network temporary identity (C-RNTI). Message 4 may include an identifier. If the identifier is consistent with the identifier included in message 3, then the contention resolution is successful and the terminal device can access the network device; if the identifier is inconsistent with the identifier included in message 3, then the contention resolution fails and the terminal device connects Failed to enter the network device.

(2) Two-step random access process based on contention

For the two-step random access process based on contention, refer to the schematic diagram shown in Figure 1b. In Figure 1b, the terminal device sends a message A to the network device; the network device sends a message B to the terminal device.

Among them, the message A may include a random access preamble sequence and a physical uplink shared channel (PUSCH). The message B is a response message after the network device receives the message A, and may include a time advance (TA).

In the embodiment of the present application, the contention-based four-step random access process is described using messages 1 to 4; for the contention-based two-step random access process, message A and message B are used for description.

2. Synchronization signal/physical broadcast channel block (SS/PBCH block)

The synchronization signal/physical broadcast channel block may be referred to as a synchronization signal block (synchronization signal block, SSB) for short. For the convenience of description, a synchronization signal block (SSB) is used for description in the embodiments of the present application. The synchronization signal block may include one or more of physical broadcast channel (physical broadcast channel, PBCH), primary synchronization signal (primary synchronization signal, PSS), and secondary synchronization signal (secondary synchronization signal, SSS).

The synchronization signal block period (or referred to as the SSB period) may include one or more SSBs, for example, 4, 8, or 64. In the new air interface (new radio, NR) (or referred to as a fifth generation (5 ^th -generation, 5G) communication technology), it is not co-located with a quasi SSB between a plurality of cycle included SSB (quasi co-located , QCL) relationship. With QCL relationship, it means that one or more of the following can be used: the same delay spread, the same Doppler spread, the same average gain, the same average delay, the same spatial parameters to send or receive signals, and the same beam Send or receive signals.

The duration of the synchronization signal block included in the synchronization signal block period may be 5 milliseconds (ms). In the implementation process, the network device can use spatial beam scanning to send SSBs. The terminal device scans multiple SSBs in the SSB cycle within 5ms. For example, one SSB cycle includes 8 SSBs, and the terminal device scans 8 SSBs within 5ms. SSB. The synchronization signal block period can be one of {5ms, 10ms, 20ms, 40ms, 80ms, 160ms}.

For example, refer to the example diagram of the SSB cycle shown in FIG. 2. In Figure 2, the SSB cycle includes 8 SSBs. When the network device sends the SSB in this SSB cycle, it can use 8 different beams to send the 8 SSBs, and each SSB corresponds to a beam. Network equipment can use beams to send SSB, and can also use beams to receive signals; terminal equipment can also use beams to send and receive signals.

When the beam of the network device is aligned with the beam of the terminal device, a matched beam pair will appear, and the performance of signal transmission through the matched beam pair is better than that of signal transmission without the matched beam pair. The terminal device can obtain a matched beam pair based on the beam measurement. For example, referring to the example diagram shown in FIG. 3, the terminal device can obtain a matched beam pair (including the downlink beam of the network device and the beam 1 of the terminal device) based on the beam measurement. Among them, the beam pair may also be referred to as a connected beam pair or a beam pair link (BPL) of a data connection, and the like.

In Figure 3, the user is close to point A of the terminal equipment. When the terminal equipment uses beam 1 for uplink data transmission, power back-off is required; point B of the terminal equipment is far away from the user. Although the performance of beam 2 is worse than that of beam 1, if beam 1 is used 2 For uplink data transmission, power backoff is not required. However, the terminal device still selects beam 1 for uplink data transmission, and even if the difference corresponding to beam 1 is smaller than the difference corresponding to beam 2, it will select beam 1 for uplink data transmission. Among them, the difference corresponding to beam 1 refers to the maximum permissible exposure (layer 1-reference signal receiving power, L1-RSRP) of the downlink beam corresponding to beam 1 and the maximum permissible exposure corresponding to beam 1. , MPE), that is, the difference between L1-RSRP1 and MPE1; the difference corresponding to beam 2 refers to the difference between the L1-RSRP corresponding to the uplink beam of beam 2 and the MPE corresponding to beam 2 Value, that is, the difference between L1-RSRP2 and MPE2.

Among them, MPE is the maximum radiation allowed by terminal equipment. In order to meet the requirements of MPE specifications in different countries and regions, it is necessary to reduce the transmission power to meet the requirements of MPE specifications. According to the time average requirement in the standard, the time average integral dynamic control method can be used to adjust the transmission power differently to meet the requirement of not exceeding the standard within any standardized time window. The aforementioned power backoff refers to reducing the transmission power. For example, when a terminal device uses beam 1 for uplink data transmission, the transmission power needs to be reduced. The MPE corresponding to the beam can be understood as the amount of transmit power that needs to be reduced, that is, how much transmit power needs to be reduced.

In Figure 3, for the terminal device, beam 1 is a downlink beam and beam 2 is an uplink beam. However, the current scheme selects the downlink beam instead of the uplink beam when performing uplink data transmission. It is understandable that in the current solution, when the matched beam pair is determined, the matched beam pair is used for uplink and downlink transmission, but the matched beam pair may not be suitable for uplink transmission, and it may also be possible for downlink transmission. It is not suitable, so that network equipment and terminal equipment cannot use suitable beams for transmission.

In view of this, the embodiments of the present application provide a random access method and communication device. During and after the random access process, a suitable reference signal can be selected for transmission, so that a suitable beam can be used for transmission, thereby Improve the efficiency and performance of transmission.

In the embodiments of the present application, a suitable uplink beam refers to an uplink beam determined by comprehensively considering factors such as power back-off and beam performance, and a suitable downlink beam is also a downlink beam determined by comprehensively considering factors such as power back-off and beam performance. Appropriate can also be described as appropriate, better, better, optional, etc. A suitable uplink beam can be called an uplink beam, and a suitable downlink beam can be called a downlink beam. In the following description, unless otherwise specified, the uplink beam and the suitable uplink beam can be interchanged, and the downlink beam and the suitable downlink beam Can be interchanged.

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Among them, in the description of the embodiments of the present application, unless otherwise specified, "/" indicates that the associated objects before and after are in an "or" relationship, for example, A/B can indicate A or B; and "and/or" indicates Three relationships, for example, a and/or b can represent a, b, a, and b, these three relationships. In the description of this application, unless otherwise specified, "plurality" means two or more than two. In addition, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish technical features that have substantially the same or similar functions and functions. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and order of execution, and words such as "first" and "second" do not limit the difference.

Please refer to FIG. 4, which is a schematic diagram of a network architecture to which an embodiment of the present application is applied. The network architecture shown in FIG. 4 includes a network device 401 and a terminal device 402. The device form and quantity shown in FIG. 4 are used as examples and do not constitute a limitation to the embodiment of the present application. For example, one network device can communicate with multiple terminal devices, and one terminal device can connect to multiple network devices.

Among them, the network device 401 may be any device with a wireless transceiving function. Including but not limited to: the base station in the Long Term Evolution (LTE) system or the base station (next-generation NodeB or gNB) in the NR system or the transmission receiving point/transmission reception in the NR system point, TRP), the base station of the subsequent evolution of 3GPP, the access node in the WiFi system, the wireless relay node, the wireless backhaul node, etc. The base station can be: a macro base station, a micro base station, a pico base station, a small station, a relay station, or a balloon station, etc. Multiple base stations can support networks of the same technology mentioned above, or networks of different technologies mentioned above. The network device 401 may also be a wireless controller, a centralized unit (CU), and/or a distributed unit (DU) in a cloud radio access network (CRAN) scenario. The network device 401 may also be a server, a wearable device, or a vehicle-mounted device. The following takes the network device 401 as a base station as an example for description. The multiple network devices may be base stations of the same type, or base stations of different types. The base station can communicate with the terminal equipment, and it can also communicate with the terminal equipment through the relay station.

Among them, the terminal device 402 is a device with wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on the water (such as ships, etc.); it can also be deployed in the air ( For example, airplanes, balloons, satellites, etc.). The terminal device 402 may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, and an industrial control (industrial control) terminal device. Wireless terminals in control), vehicle-mounted terminal equipment, wireless terminals in unmanned driving (self-driving), wireless terminals in remote medical (remote medical), wireless terminals in smart grid (smart grid), transportation safety (transportation safety) Wireless terminals in ), wireless terminals in smart cities, wireless terminals in smart homes, wearable terminal devices, and so on. The embodiments of this application do not limit the application scenarios. The terminal equipment 402 may sometimes be called a terminal, a mobile terminal, a user equipment (UE), an access terminal device, a vehicle-mounted terminal, an industrial control terminal, a UE unit, a UE station, a mobile station, a mobile station, a remote station, and a remote station. Terminal equipment, mobile equipment, UE agent or UE device, etc. The terminal device 402 may also be fixed or mobile.

In the embodiment of the present application, the network device 401 is a network device that supports multiple beams. For example, it can support beams based on wide coverage, and can also support beams based on fixed wireless access (FWA) accurate coverage.

In the embodiment of the present application, the network device 401 and the terminal device 402 may perform a four-step random access process based on contention, or may perform a two-step random access process based on contention. According to the embodiment of the present application, during and after the random access process, an appropriate reference signal is selected for transmission, so that the network device 401 and the terminal device 402 can use appropriate beams for transmission, thereby improving transmission efficiency and performance .

The embodiments of the present application can be applied to LTE systems, NR systems, and can also be applied to future communication systems, such as future networks or sixth-generation communication systems.

The network architecture and business scenarios described in the embodiments of this application are intended to more clearly illustrate the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. Those of ordinary skill in the art will know that with the network With the evolution of architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are equally applicable to similar technical problems.

Based on the network architecture shown in FIG. 4, the random access method provided in the embodiment of the present application will be described in detail below. During the introduction, the names of the messages or signals exchanged between the terminal device and the network device are used as examples, and do not constitute a limitation to the embodiments of the present application.

Please refer to FIG. 5, which is a schematic flow chart of a random access method provided by an embodiment of this application. The flow is aimed at a contention-based four-step random access process. The process can include but is not limited to the following steps:

Step 501: The terminal device sends a message 1 to the network device, and the message 1 is associated with the first reference signal. Correspondingly, the network device receives the message 1 from the terminal device.

Step 502: The network device sends a message 2 to the terminal device, and the message 2 is associated with the first reference signal. Correspondingly, the terminal device receives the message 2 from the network device.

Step 503: The terminal device sends a message 3 to the network device, and the message 3 includes candidate reference signal information. Correspondingly, the network device receives the message 3 from the terminal device. Optionally, message 3 is associated with the first reference signal.

Step 504: The network device determines the second reference signal according to the candidate reference signal information.

Step 505: The network device sends a message 4 to the terminal device, and the message 4 is associated with the second reference signal. Correspondingly, the terminal device receives the message 4 from the network device.

In a possible implementation manner, the first reference signal and the second reference signal may be synchronization signal blocks (ie, SSB), and belong to the same synchronization signal block period. That is, the first reference signal and the second reference signal may be different SSBs in the same SSB period, correspond to different SSB indexes, have different beam directions, and do not have a QCL relationship. For example, the SSB cycle includes 8 SSBs (SSB0 to SSB7), the first reference signal is SSB1, the second reference signal is SSB4, and the beam directions are different. The first reference signal and the second reference signal are different SSBs in the same SSB period, compared to different SSBs in different SSB periods (for example, the first reference signal is SSB1 in SSB period 1, and the second reference signal is SSB period 2. SSB4), can avoid searching for SSB and beam measurement again, thereby saving time delay.

In a possible implementation manner, the first reference signal and the second reference signal are channel state information reference signals (CSI-RS). The beam directions corresponding to the first CSI-RS and the second CSI-RS are different. CSI-RS may be configured periodically, non-periodically, or semi-persistently. Whether the first CSI-RS and the second CSI-RS belong to the same CSI-RS period is related to the CSI-RS configuration, for example, CSI -RS is configured periodically, then the first CSI-RS and the second CSI-RS may belong to the same CSI-RS period. The first CSI-RS and the second CSI-RS may be CSI-RSs with different CSI-RS resource configurations, that is, the CSI-RS resource configurations of the first CSI-RS and the second CSI-RS are different. The first CSI-RS and the second CSI-RS may be CSI-RS configured with different CSI-RS resource sets, that is, the CSI-RS resource set configurations of the first CSI-RS and the second CSI-RS are different.

In addition to the above two methods, the first reference signal and the second reference signal can also be other types of reference signals, and other types of reference signals can satisfy that the first reference signal and the second reference signal have different beam directions and do not have a QCL relationship. . In the embodiments of this application, the first reference signal and the second reference signal are SSB as an example for introduction, that is, the first reference signal is the first SSB, and the second reference signal is the second SSB as an example. The reference signal can refer to SSB.

Before the terminal device performs step 501, the terminal device matches the SSB sent by the network device with its own beam to determine a matching beam pair. For example, referring to the beam alignment example diagram shown in Figure 6, it is assumed that the beam of SSB1 of the network device and the beam 1 of the terminal device are a matched beam pair, but in the matched beam pair, the beam of SSB1 is not necessarily an uplink beam, that is, for For uplink transmission, the beam of SSB1 may not be suitable; or the beam of SSB1 may not be a downlink beam, that is, for downlink transmission, the beam of SSB1 may not be suitable. Therefore, the terminal device needs to determine the uplink beam and/or the downlink beam, the uplink beam is used to implement uplink transmission, and the downlink beam is used to implement downlink transmission. The beam associated with the SSB refers to the beam corresponding to the SSB. One SSB corresponds to one beam, which can be understood as one SSB using one beam or one beam carrying one SSB, etc.

The terminal device may determine the uplink beam and/or the downlink beam according to the measurement result of the SSB and/or the back-off power corresponding to the SSB.

In an embodiment, the terminal device may determine the uplink beam according to the measurement result of the SSB and the back-off power corresponding to the SSB. Among them, the measurement result of the SSB may include reference signal receiving power (RSRP).

Assume that the beam of SSB1 and beam 1 of the terminal device is a matched beam pair, the expected power configured by the network device is P0, the back-off power of beam 1 of the terminal device is MPE1, and the RSRP of receiving SSB1 is PL1; the return of beam 2 of the terminal device The back-off power is MPE2, and the RSRP of receiving SSB2 is PL2.

If |P0+PL2-MPE2|-|P0+PL1-MPE1|<X decibels (dB), the terminal device can choose the beam of SSB1 as the uplink beam, and the transmit power is back to MPE1 (that is, the back-off power corresponding to SSB1 is MPE1 ); if |P0+PL2-MPE2|-|P0+PL1-MPE1|>=X dB, the terminal device can select the beam of SSB2 as the uplink beam, and the transmit power will fall back to MPE2 (that is, the fall back power corresponding to SSB2 is MPE2 ). The maximum transmit power of different beams of the terminal equipment is different due to the power back-off factor: Pmax1 is used to indicate the maximum transmit power of beam 1 of the terminal device, and Pmax2 is used to indicate the maximum transmit power of beam 2 of the terminal device. When P0+PL1+ When Delta*n<Pmax1, the terminal device can choose to use beam 1 for uplink transmission; otherwise, it can choose to use beam 2 for uplink transmission.

Among them, the specific value of X can be agreed upon by agreement or configured by network equipment. Delta represents the amount of power adjustment. When the terminal device sends a random access preamble sequence to the network device for the n-1th time, and does not receive a random access response to the random access preamble sequence, the terminal device adjusts the transmission power, and according to the adjusted power, The random access preamble sequence is sent to the network device for the nth time. Delta represents the amount of power adjustment between the transmission power of the nth random access preamble sequence and the n-1th transmission power of the random access preamble sequence. n represents the nth time, and n is an integer greater than or equal to 1.

The terminal device can also determine the downlink beam according to the measurement result of the SSB and the back-off power corresponding to the SSB. The specific process can refer to the process of determining the uplink beam.

It can be understood that the terminal device selects the uplink beam, that is, selects the SSB associated with the uplink information, for example, the uplink beam is the beam of SSB1, then the uplink information can be associated with SSB1. The terminal device selects the downlink beam, that is, selects the SSB associated with the downlink information. For example, the downlink beam is the beam of SSB2, then the downlink information can be associated with SSB2.

Among them, uplink information is associated with SSB1, which can also be described as uplink information is associated with SSB1, uplink information has an association relationship with SSB1, and the SSB associated with uplink information is SSB1, and the beam used for sending uplink information corresponds to SSB1, or sending uplink information The beam used is the beam of SSB1, etc. Association can also be described as mapping, correspondence, correlation, or allocation. The uplink information is associated with SSB1. It can be understood that the uplink information has a QCL relationship with SSB1. The same delay spread, or the same Doppler spread, or the same average gain, or the same average delay, or the same space parameters can be used. Send or receive signals, or use the same beam to send or receive. For the explanation of the downlink information associated with SSB2, please refer to the explanation of the uplink information associated with SSB1.

In an embodiment, the terminal device can determine the uplink beam according to the RSRP of the SSB and the backoff power corresponding to the SSB; according to the layer 1-signal to interference and noise ratio (L1-SINR) of the SSB, Determine the downlink beam. Or, determine the downlink beam according to the RSRP of the SSB and the back-off power corresponding to the SSB; determine the uplink beam according to the L1-SINR of the SSB. The L1-SINR of the SSB can be understood as one of the measurement results of the SSB. The embodiment of this application does not limit how the terminal device determines the downlink beam or the uplink beam according to the L1-SINR of the SSB.

Exemplarily, the SSB cycle includes SSB0 to SSB7, and the SSB associated with the uplink information is determined to be SSB0 according to the RSRP and backoff power of the SSB. Among SSB1 to SSB7, the L1-SINR of SSB4 is the largest, then it can be determined that the SSB associated with the downlink information is SSB4.

Among them, L1-SINR refers to the signal-to-noise ratio of the reference signal of the physical layer.

Optionally, taking the determination of the SSB associated with the downlink information according to the L1-SINR of the SSB as an example, from the SSBs whose RSRP meets the threshold, the SSB associated with the downlink information is selected according to the L1-SINR of the SSB. For example, the SSBs whose RSRP meets the threshold include SSB3 to SSB7. Among the 5 SSBs, the L1-SINR of SSB4 is the largest, so the SSB associated with the downlink information can be selected as SSB4.

In an embodiment, the terminal device may determine the uplink beam and the downlink beam according to the L1-SINR of the SSB, that is, determine the SSB associated with the uplink information and the SSB associated with the downlink information.

In the above three embodiments, the terminal equipment selecting the PRACH occasion of the SSB associated with the uplink information is different from selecting the PRACH occasion of the SSB associated with the downlink information. For example, the SSB associated with uplink information is selected in PRACH occasion1, and the SSB associated with downlink information is selected in PRACH occasion2. Among them, PRACH occasion may also be referred to as random access channel (random access channel, PACH) timing or random access timing, etc.

For step 502, message 1 is associated with the first SSB, which can be described as the beam used by the terminal device to send message 1 is the same as the beam associated with the first SSB, or the terminal device uses the beam associated with the first SSB to send message 1, or the terminal device The beam used to send the message 1 is the beam associated with the first SSB, or the beam used to send the message 1 and the beam associated with the first SSB have a QCL relationship, and so on.

The protocol may specify that Message 1 is associated with the first SSB, or the network device may configure Message 1 to be associated with the first SSB. Further, the protocol may specify that the beam associated with the message 1 and the first SSB is an uplink beam or a downlink beam, or the network device may configure the beam associated with the message 1 and the first SSB as an uplink beam or a downlink beam. The beam associated with message 1 and the first SSB is an uplink beam, which can be understood as the beam used by the terminal device to send message 1 as an uplink beam; the beam associated with message 1 and the first SSB is a downlink beam, which can be understood as the beam used by the terminal device to send message 1 For the downlink beam.

For the explanation of the association between the message 2 and the first SSB in step 502, please refer to the explanation of the association between the message 1 and the first SSB. It can be understood that the beam for sending message 2 by the network device is the beam for receiving 1. The protocol may specify that message 2 is associated with the first SSB. Further, the protocol may specify that the beam associated with the message 2 and the first SSB is an uplink beam or a downlink beam, or the network device may configure the beam associated with the first SSB according to the protocol to configure the message 2 as an uplink beam or a downlink beam. Optionally, if the beam associated with message 1 and the first SSB is an uplink beam, then the beam associated with message 2 and the first SSB is also an uplink beam; if the beam associated with message 1 and the first SSB is a downlink beam, then message 2 The beam associated with the first SSB is also a downlink beam.

Optionally, the message 2 may include first indication information, and the first indication information is used to indicate that the quality of the SSB corresponding to the uplink beam is YdB lower than the quality of the SSB corresponding to the downlink beam, Y<X. Then, when the terminal device obtains the indication information, it can use a contention-based two-step random access process to perform random access, thereby overcoming the problem of poor performance of message 2.

Optionally, message 2 may include second indication information, which is used to indicate the SSB associated with message 3, for example, indicating that the SSB associated with message 3 is the first SSB, that is, the SSB associated with message 3 and the SSB associated with message 1 the same. That is, the SSB associated with the uplink message in the random access process is the same, and the associated beam is the same.

For step 503, the message 3 is associated with the first SSB, and the explanation can refer to the explanation of the message 1 being associated with the first SSB. Message 3 includes candidate reference signal information, and the candidate reference signal information is used by the network device to determine the second SSB. It is understandable that message 3 is used to report candidate beams, the candidate beams may be uplink beams or downlink beams, and the candidate beams are the beams associated with the second SSB. The protocol may specify that the candidate beam is an uplink beam or a downlink beam, or the network device may configure the candidate beam reported by message 3 to be an uplink beam or a downlink beam. If the beam associated with message 1 is an uplink beam, then the candidate beam is a downlink beam; if the beam associated with message 1 is a downlink beam, then the candidate beam is an uplink beam.

The candidate reference signal information may include one or more of the following: path loss information, the index of the second SSB, the back-off power corresponding to the SSB, and the measurement result of the SSB.

The path loss information specifies the path loss difference between the SSB corresponding to the uplink beam and the SSB corresponding to the downlink beam, for example, the path loss difference between the first SSB and the second SSB. The network device can determine the first SSB through message 1, and can determine the second SSB according to the path loss difference and the first SSB.

The index of the second SSB, that is, the terminal device can directly report the index of the second SSB, and the network device can directly determine the second SSB according to the index of the second SSB.

The back-off power corresponding to the SSB includes the index of each SSB and the back-off power corresponding to the index of each SSB. For example, it includes the back-off power MPE0 corresponding to SSB0, the back-off power MPE1 corresponding to SSB1, the back-off power MPE2 corresponding to SSB2, and the back-off power MPE3 corresponding to SSB3. The network device may determine the second SSB from the multiple SSBs according to the backoff power corresponding to each SSB.

The measurement result of the SSB may include the index of each SSB and the measurement result corresponding to the index of each SSB. The measurement result may include RSRP and/or LI-SINR. The network device may determine the second SSB from the multiple SSBs according to the measurement results of each SSB.

Optionally, the network device may determine the second SSB from the multiple SSBs according to the backoff power corresponding to the SSB and the measurement result of the SSB.

For step 505, the message 4 is associated with the second SSB, and the explanation can refer to the explanation of the message 1 being associated with the first SSB.

In a possible implementation manner, when the terminal device receives the message 4, the terminal device calculates the difference DeltaTA between the first time when the message 4 is received and the second time when the message 4 is estimated to be received, according to the difference The TA value for sending uplink information is adjusted, and the adjustment amount is TA+DeltaTA. If the terminal device fails to receive the message 4, for example, the message 4 is not received over time, the terminal device can use the beam associated with the first SSB to send a retransmission request message to the network device. The retransmission request message is used to request the network device to retransmit the message 4.

Exemplarily, refer to FIG. 7, which is an example diagram based on FIG. 5. It is assumed in FIG. 7 that the first SSB is SSB2, and the beam associated with SSB2 is an uplink beam; the second SSB is SSB1, and the beam associated with SSB1 is a downlink beam. The terminal device selects SSB1 at random access channel occasion (RO)1, and selects SSB2 at RO2. Message 1 is associated with SSB2, message 2 is associated with SSB2, message 3 is associated with SSB2, message 3 includes the index of SSB1, and message 4 is associated with SSB1. For another example, the beam associated with SSB2 is a downlink beam, and the beam associated with SSB1 is an uplink beam.

In a possible implementation manner, if the network device fails to send the message 4 using the beam associated with the first SSB, the beam associated with the second SSB can be used to send the message 4, that is, the message 4 is associated with the second SSB at this time. In the case of receiving message 4, the terminal device calculates the difference DeltaTA between the first time when message 4 is received and the second time when message 4 is estimated to be received, and adjusts the TA value for sending uplink information according to the difference. , The adjustment amount is TA+DeltaTA. It is understandable that, in this manner, when the network device fails to send the message 4 using the beam associated with the first SSB, it uses the beam associated with the second SSB to send the message 4 instead.

In the embodiment shown in Figure 5, in the four-step random access process, the SSB associated with the uplink message is different from the SSB associated with the downlink message, so that the transmission of the uplink message can use the appropriate beam, and the transmission of the downlink message can use the appropriate beam. Beam, thus transmission efficiency and performance.

As an optional embodiment, after step 505, it further includes one or more of the following:

(1) The terminal device sends uplink information to the network device, and the uplink information is associated with the first SSB.

(2) The network device sends downlink information to the terminal device, and the downlink information is associated with the second SSB.

(3) The terminal device sends uplink information to the network device, and the uplink information is associated with the second SSB.

(4) The network device sends downlink information to the terminal device, and the downlink information is associated with the first SSB.

One of the above (1) to (4) can be performed, or two or more of them can be performed.

In a possible implementation manner, perform (1) and (3), after the terminal device accesses the network device through the random access process, the uplink information sent to the network device can be associated with the first SSB at a certain moment , It can be associated with the second SSB at another moment, that is, the uplink information is not always associated with the first SSB.

In a possible implementation manner, perform (2) and (4). After the terminal device accesses the network device through the random access process, the downlink information sent by the network device to the terminal device can communicate with the first The SSB association can be associated with the second SSB at another moment, that is, the downlink information is not always associated with the second SSB.

In a possible implementation manner, (1) and (2) are executed. After the terminal device accesses the network device through the random access process, the uplink information sent to the network device is associated with the first SSB; The downlink information sent by the device is associated with the second SSB.

In a possible implementation manner, perform (3) and (4). After the terminal device accesses the network device through the random access process, the uplink information sent to the network device is associated with the second SSB; The downlink information sent by the device is associated with the first SSB.

The foregoing uplink information may be, for example, HARQ information of message 4, or message 5, or uplink data, or uplink signal. The aforementioned downlink information may be, for example, message 6, or downlink data, or downlink signals.

In this optional embodiment, after the random access process, the uplink information and the downlink information are not fixedly associated with a SSB, which is flexible and has a wide range of adaptability, which can make the uplink and downlink transmissions after the random access process have a higher Efficiency and performance.

Please refer to FIG. 8, which is a schematic flow chart of another random access method provided by an embodiment of this application. This flow is for a contention-based two-step random access process. The process can include but is not limited to the following steps:

Step 801: The terminal device sends a message A to the network device, the message A is associated with the first reference signal, and the message A includes candidate reference signal information. Correspondingly, the network device receives the message A from the terminal device.

Step 802: The network device determines a second reference signal according to the candidate reference signal information.

Step 803: The network device sends a message B to the terminal device, and the message B is associated with the second reference signal. Correspondingly, the terminal device receives the message B from the network device.

For the description of the first reference signal and the second reference signal, please refer to the description of the first reference signal and the second reference signal in the embodiment shown in FIG. 5, which will not be repeated here.

The description of the terminal device before performing step 801 is similar to the description of the terminal device before performing step 501 in the embodiment shown in FIG. 5. The difference is that in Figure 5, the terminal equipment selects the PRACH occasion of the SSB associated with the uplink information, which is different from the PRACH occasion of the SSB associated with the downlink information. Therefore, the terminal equipment carries candidate reference signal information in message 3; while in Figure 8 The terminal device selects the PRACH occurrence of the SSB associated with the uplink information, which may be the same as the PRACH occurrence of the SSB associated with the selection of the downlink information, so the terminal device may carry candidate reference signal information in the message A.

For step 801, the explanation of the association between the message A and the first SSB may refer to the explanation of the association between the message 1 and the first SSB. Message A includes candidate reference signal information. For candidate reference signal information, refer to the description of candidate reference signal information in the embodiment shown in FIG. 5, which is not repeated here. Message A may include random access preamble sequence and PUSCH, and PUSCH may include candidate reference signal information. The message A is associated with the first SSB, and may be that the random access preamble sequence is associated with the first SSB.

For step 803, the message B is associated with the second SSB, similar to the message 4 is associated with the second SSB.

In the case of receiving message B, the terminal device calculates the difference DeltaTA between the first time when message B is received and the second time when message B is estimated to be received, and adjusts the TA value for sending uplink information according to the difference. , The adjustment amount is TA+DeltaTA.

Exemplarily, refer to FIG. 9, which is an example diagram based on FIG. 8. In FIG. 9, it is assumed that the first SSB is SSB1, and the beam associated with SSB1 is an uplink beam; the second SSB is SSB2, and the beam associated with SSB2 is a downlink beam. The terminal equipment selects SSB1 and SSB2 in RO1. Message A is associated with SSB1, and message B is associated with SSB2. For another example, the beam associated with SSB1 is a downlink beam, and the beam associated with SSB2 is an uplink beam.

In the embodiment shown in Figure 8, in the two-step random access process, the SSB associated with the uplink message is different from the SSB associated with the downlink message, so that the transmission of the uplink message can use the appropriate beam, and the transmission of the downlink message can use the appropriate beam. Beam, thus transmission efficiency and performance.

As an optional embodiment, after step 803, it further includes one or more of the following:

For this optional embodiment, please refer to the description after step 505, which will not be repeated here.

Corresponding to the method given in the foregoing method embodiment, an embodiment of the present application also provides a corresponding communication device, and the communication device includes a corresponding module for executing the foregoing embodiment. The module can be software, hardware, or a combination of software and hardware.

Refer to FIG. 10, which is a schematic structural diagram of a communication device provided by an embodiment of this application. The communication device 900 shown in FIG. 10 may include a communication unit 901 and a processing unit 902. The communication unit 901 may include a sending unit 9011 and a receiving unit 9012. The sending unit 9011 is used to implement a sending function, the receiving unit 9012 is used to implement a receiving function, and the communication unit 901 may implement a sending function and/or a receiving function. The communication unit 901 may also be described as a transceiving unit.

The communication device 900 may be a terminal device, a device in a terminal device, or a device that can be matched and used with the terminal device.

The communication device 900 is used to implement the functions of the terminal device in the embodiment shown in FIG. 5:

In an embodiment, the processing unit 902 is configured to use the communication unit 901 to send a message 1 to the network device, where the message 1 is associated with a first reference signal; receive a message 2 from the network device, and the message 2 is associated with the first reference signal Send a message 3 to the network device, the message 3 includes candidate reference signal information, the candidate reference signal information is used to determine the second reference signal; receive a message 4 from the network device, the message 4 is associated with the second reference signal;

The processing unit 902 is further configured to determine the first reference signal from the multiple reference signals according to the measurement result of the reference signal and/or the back-off power corresponding to the reference signal.

In an embodiment, the sending unit 9011 is configured to send message 1 to the network device, and the message 1 is associated with the first reference signal; and the receiving unit 9012 is configured to receive message 2 from the network device, and the message 2 is related to the first reference signal. Signal association; the sending unit 9011 is also used to send a message 3 to the network device, the message 3 includes candidate reference signal information, the candidate reference signal information is used to determine the second reference signal; the receiving unit 9012 is also used to receive from the network device Message 4, the message 4 is associated with the second reference signal; wherein, the first reference signal and the second reference signal are synchronization signal blocks and belong to the same synchronization signal block period.

The processing unit 902 is configured to determine the first reference signal from the multiple reference signals according to the measurement result of the reference signal and/or the back-off power corresponding to the reference signal.

The communication device 900 is used to implement the functions of the terminal device in the embodiment shown in FIG. 8:

In an embodiment, the processing unit 902 is configured to use the communication unit 901 to send a message A to the network device, and the message A is associated with the first reference signal; the message A includes candidate reference signal information, and the candidate reference signal information is used to determine the second reference signal. Reference signal; receiving message B from the network device, the message B is associated with the second reference signal;

In an embodiment, the sending unit 9011 is configured to send a message A to the network device, where the message A is associated with the first reference signal; the message A includes candidate reference signal information, and the candidate reference signal information is used to determine the second reference signal; receive The unit 9012 is configured to receive a message B from a network device, and the message B is associated with a second reference signal; wherein the first reference signal and the second reference signal are synchronization signal blocks and belong to the same synchronization signal block period.

The communication device 900 may be a network device, a device in a network device, or a device that can be matched and used with the network device.

The communication device 900 is used to implement the functions of the network device in the embodiment shown in FIG. 5:

In an embodiment, the processing unit 902 is configured to use the communication unit 901 to receive a message 1 from a terminal device, and the message 1 is associated with a first reference signal; and send a message 2 to the terminal device, and the message 2 is related to the first reference signal. A reference signal association; receiving a message 3 from a terminal device, the message 3 including candidate reference signal information; determining the second reference signal according to the candidate reference signal information; sending a message 4 to the terminal device, the message 4 being associated with the second reference signal ；

In an embodiment, the receiving unit 9012 is configured to receive message 1 from the terminal device, and the message 1 is associated with the first reference signal; the sending unit 9011 is configured to send message 2 to the terminal device, and the message 2 is associated with the first reference signal. A reference signal association; the receiving unit 9012 is also used to receive a message 3 from the terminal device, the message 3 includes candidate reference signal information; the processing unit 902 is used to determine the second reference signal according to the candidate reference signal information; the sending unit 9011 , Is also used to send message 4 to the terminal device; wherein, the first reference signal and the second reference signal are synchronization signal blocks and belong to the same synchronization signal block period.

The communication device 900 is used to implement the function of the network device in the embodiment shown in FIG. 8:

In an embodiment, the processing unit 902 is configured to use the communication unit 901 to receive a message A from the terminal device, the message A is associated with the first reference signal; the message A includes candidate reference signal information; and the determination is based on the candidate reference signal information A second reference signal; sending a message B to the terminal device, and the message B is associated with the second reference signal;

In an embodiment, the receiving unit 9012 is configured to receive a message A from the terminal device, and the message A is associated with the first reference signal; the message A includes candidate reference signal information; and the sending unit 9011 is configured to send a message to the terminal device B. The message B is associated with the second reference signal; where the first reference signal and the second reference signal are synchronization signal blocks and belong to the same synchronization signal block period.

Figure 11 shows a schematic diagram of the structure of a communication device. The communication device 1000 may be a terminal device, or a chip, a chip system, or a processor that supports the terminal device to implement the foregoing method. The device can be used to implement the method described in the foregoing method embodiment, and for details, please refer to the description in the foregoing method embodiment.

The communication device 1000 may include one or more processors 1001. The processor 1001 may be a general-purpose processor or a special-purpose processor. For example, it can be a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processor can be used to control communication devices (such as base stations, baseband chips, terminals, terminal chips, DU or CU, etc.), execute software programs, and process The data of the software program.

Optionally, the communication device 1000 may include one or more memories 1002, on which instructions 1004 may be stored, and the instructions may be executed on the processor 1001, so that the device 1000 executes the foregoing method implementation The method described in the example. Optionally, the memory 1002 may also store data. The processor 1001 and the memory 1002 can be provided separately or integrated together.

Optionally, the communication device 1000 may further include a transceiver 1005 and an antenna 1006. The transceiver 1005 may be called a transceiver unit, a transceiver, a communication interface or a transceiver circuit, etc., for implementing the transceiver function. The transceiver 1005 may include a receiver and/or a transmitter. The receiver may be referred to as a receiver or a receiving circuit, etc., for implementing the receiving function; the transmitter may be referred to as a transmitter or a transmitting circuit, etc., for implementing the transmitting function.

The communication device 1000 is a terminal device: the processor 1001 can use the transceiver 1005 to perform steps 501 to 503 and step 505 in FIG. 5; to perform steps 801 and 803 in FIG. 8.

In another alternative design, the processor 1001 may include a transceiver for implementing receiving and sending functions. For example, the transceiver may be a communication interface, a transceiver circuit, or an interface, or an interface circuit. The transceiver circuits, interfaces, or interface circuits used to implement the receiving and transmitting functions can be separate or integrated. The foregoing transceiver circuit, interface, or interface circuit can be used for code/data reading and writing, or the foregoing transceiver circuit, interface, or interface circuit can be used for signal transmission or transmission.

In another possible design, optionally, the processor 1001 may store an instruction 1003, and the instruction 1003 runs on the processor 1001, so that the apparatus 1000 can execute the method described in the foregoing method embodiment. The instruction 1003 may be solidified in the processor 1001. In this case, the processor 1001 may be implemented by hardware.

In another possible design, the communication device 1000 may include a circuit, and the circuit may implement the sending or receiving or communication function in the foregoing method embodiment. The processor and transceiver described in this application can be implemented in integrated circuit (IC), analog IC, radio frequency integrated circuit RFIC, mixed signal IC, application specific integrated circuit (ASIC), printed circuit board ( printed circuit board, PCB), electronic equipment, etc. The processor and transceiver can also be manufactured by various IC process technologies, such as complementary metal oxide semiconductor (CMOS), nMetal-oxide-semiconductor (NMOS), P-type Metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

The communication device described in the above embodiment may be a network device or a terminal device, but the scope of the communication device described in this application is not limited to this, and the structure of the communication device may not be limited by FIG. 11. The communication device may be a stand-alone device or may be part of a larger device.

For the case where the communication device can be a chip or a chip system, refer to the schematic diagram of the chip structure shown in FIG. 12. The chip 1100 shown in FIG. 12 includes a processor 1101 and an interface 1102. The number of processors 1101 may be one or more, and the number of interfaces 1102 may be multiple.

For the case where the chip is used to implement the function of the terminal device in the embodiment of the present application:

In one design, the processor 1101 sends the message 1 to the network device through the interface 1102, and the message 1 is associated with the first reference signal; receives the message 2 from the network device, and the message 2 is associated with the first reference signal; Send message 3, the message 3 includes candidate reference signal information, the candidate reference signal information is used to determine the second reference signal; receive a message 4 from the network device, the message 4 is associated with the second reference signal;

In one design, the processor 1101 sends a message A to the network device through the interface 1102, and the message A is associated with the first reference signal; the message A includes candidate reference signal information, and the candidate reference signal information is used to determine the second reference signal; Receiving a message B from the network device, where the message B is associated with the second reference signal;

Optionally, the chip further includes a memory 1003, and the memory 1003 is used to store necessary program instructions and data for the terminal device.

Figure 13 provides a schematic structural diagram of a terminal device. For ease of description, FIG. 13 shows the main components of the terminal device. As shown in FIG. 13, the terminal device 1200 includes a processor, a memory, a control circuit, an antenna, and an input and output device. The processor is mainly used to process the communication protocol and communication data, and to control the entire terminal, execute the software program, and process the data of the software program. The memory is mainly used to store software programs and data. The control circuit may include a radio frequency circuit. The radio frequency circuit is mainly used for conversion of baseband signals and radio frequency signals and processing of radio frequency signals. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users.

When the terminal device is turned on, the processor can read the software program in the storage unit, parse and execute the instructions of the software program, and process the data of the software program. When sending data wirelessly, the processor performs baseband processing on the data to be sent and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit processes the baseband signal to obtain a radio frequency signal and sends the radio frequency signal out in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives the radio frequency signal through the antenna, the radio frequency signal is further converted into a baseband signal, and the baseband signal is output to the processor, and the processor converts the baseband signal into data and performs processing on the data. deal with.

For ease of description, FIG. 13 shows a memory and a processor. In an actual terminal device, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, etc., which is not limited in the embodiment of the present application.

As an optional implementation, the processor may include a baseband processor and a central processing unit. The baseband processor is mainly used to process communication protocols and communication data. The central processing unit is mainly used to control the entire terminal device and execute Software program, processing the data of the software program. The processor in FIG. 13 integrates the functions of the baseband processor and the central processing unit. Those skilled in the art can understand that the baseband processor and the central processing unit may also be independent processors and are interconnected by technologies such as buses. Those skilled in the art can understand that the terminal device may include multiple baseband processors to adapt to different network standards, the terminal device may include multiple central processors to enhance its processing capabilities, and the various components of the terminal device may be connected through various buses. The baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data can be built in the processor, or can be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.

Those skilled in the art can also understand that the various illustrative logical blocks and steps listed in the embodiments of the present application can be implemented by electronic hardware, computer software, or a combination of the two. Whether such a function is implemented by hardware or software depends on the specific application and the design requirements of the entire system. Those skilled in the art can use various methods to implement the described functions for each specific application, but such implementation should not be construed as going beyond the protection scope of the embodiments of the present application.

The present application also provides a computer-readable storage medium on which a computer program is stored, and when the computer-readable storage medium is executed by a computer, the function of any of the foregoing method embodiments is realized.

This application also provides a computer program product, which, when executed by a computer, realizes the functions of any of the foregoing method embodiments.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server, or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk, SSD)) etc.

A person of ordinary skill in the art can understand that the various digital numbers such as first and second involved in this application are for easy distinction for description, and are not used to limit the scope of the embodiments of this application, but also indicate a sequence.

The corresponding relationships shown in the tables in this application can be configured or pre-defined. The value of the information in each table is an example and can be configured to other values, which is not limited in this application. When configuring the correspondence between the information and the parameters, it is not necessarily required to configure all the correspondences illustrated in the tables. For example, in the table in this application, the corresponding relationship shown in some rows may not be configured. For another example, appropriate deformation adjustments can be made based on the above table, such as splitting, merging, and so on. The names of the parameters shown in the titles in the above tables may also be other names that can be understood by the communication device, and the values or expressions of the parameters may also be other values or expressions that can be understood by the communication device. When the above tables are implemented, other data structures can also be used, such as arrays, queues, containers, stacks, linear tables, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables, or hash tables. Wait.

The pre-definition in this application can be understood as definition, pre-definition, storage, pre-storage, pre-negotiation, pre-configuration, curing, or pre-fired.

A person of ordinary skill in the art may realize that the units and algorithm steps of the examples 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 executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

The above are specific implementations of this application, but the scope of protection of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Covered in the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A random access method, characterized in that it comprises:

Sending a message 1 to the network device, where the message 1 is associated with the first reference signal;

Receiving a message 2 from the network device, the message 2 being associated with the first reference signal;

Sending a message 3 to the network device, where the message 3 includes candidate reference signal information, and the candidate reference signal information is used to determine a second reference signal;

Receiving a message 4 from the network device, where the message 4 is associated with the second reference signal;

Wherein, the first reference signal and the second reference signal are synchronization signal blocks and belong to the same synchronization signal block period.
The method according to claim 1, wherein after receiving the message 4 from the network device, the method further comprises one or more of the following:

Sending uplink information to the network device, where the uplink information is associated with the first reference signal;

Receiving downlink information from the network device, where the downlink information is associated with the second reference signal;

Sending uplink information to the network device, where the uplink information is associated with the second reference signal;

Receiving downlink information from the network device, where the downlink information is associated with the first reference signal.
The method according to claim 1, wherein the message 2 is used to indicate that the reference signal associated with the message 3 is the first reference signal.
The method according to any one of claims 1-3, wherein the method further comprises:

The first reference signal is determined from a plurality of reference signals according to the measurement result of the reference signal and/or the back-off power corresponding to the reference signal.
The method according to claim 4, wherein the candidate reference signal information includes one or more of the following: path loss information, an index of the second reference signal, a backoff power corresponding to the reference signal, The measurement result of the reference signal.
A random access method, characterized in that it comprises:

Receiving message 1 from the terminal device, the message 1 being associated with the first reference signal;

Sending a message 2 to the terminal device, where the message 2 is associated with the first reference signal;

Receiving a message 3 from the terminal device, where the message 3 includes candidate reference signal information;

Determine a second reference signal according to the candidate reference signal information;

Sending a message 4 to the terminal device, where the message 4 is associated with the second reference signal;

Wherein, the first reference signal and the second reference signal are synchronization signal blocks and belong to the same synchronization signal block period.
The method according to claim 6, wherein after sending the message 4 to the terminal device, the method further comprises one or more of the following:

Receiving uplink information from the terminal device, where the uplink information is associated with the first reference signal;

Sending downlink information to the terminal device, where the downlink information is associated with the second reference signal;

Receiving uplink information from the terminal device, where the uplink information is associated with the second reference signal;

Sending downlink information to the terminal device, where the downlink information is associated with the first reference signal.
The method according to claim 6, wherein the message 2 is used to indicate that the reference signal associated with the message 3 is the first reference signal.
The method according to any one of claims 6-8, wherein the candidate reference signal information includes one or more of the following: path loss information, an index of the second reference signal, and the reference signal corresponds to The back-off power of the reference signal is the measurement result of the reference signal.
A random access method, characterized in that it comprises:

Sending a message A to the network device, where the message A is associated with the first reference signal; the message A includes candidate reference signal information, and the candidate reference signal information is used to determine the second reference signal;

Receiving a message B from the network device, where the message B is associated with the second reference signal;

Wherein, the first reference signal and the second reference signal are synchronization signal blocks and belong to the same synchronization signal block period.
The method according to claim 10, wherein after the receiving message B from the network device, the method further comprises one or more of the following:

Sending uplink information to the network device, where the uplink information is associated with the first reference signal;

Receiving downlink information from the network device, where the downlink information is associated with the second reference signal;

Sending uplink information to the network device, where the uplink information is associated with the second reference signal;

Receiving downlink information from the network device, where the downlink information is associated with the first reference signal.
The method according to claim 10 or 11, wherein the candidate reference signal information includes one or more of the following: path loss information, index of the second reference signal, backoff power corresponding to the reference signal, The measurement result of the reference signal.
A random access method, characterized in that it comprises:

Receiving a message A from a terminal device, where the message A is associated with a first reference signal; the message A includes candidate reference signal information;

Determine a second reference signal according to the candidate reference signal information;

Sending a message B to the terminal device, where the message B is associated with the second reference signal;

Wherein, the first reference signal and the second reference signal are synchronization signal blocks and belong to the same synchronization signal block period.
The method according to claim 13, wherein after sending the fourth message to the terminal device, the method further comprises one or more of the following:

Receiving uplink information from the terminal device, where the uplink information is associated with the first reference signal;

Sending downlink information to the terminal device, where the downlink information is associated with the second reference signal;

Receiving uplink information from the terminal device, where the uplink information is associated with the second reference signal;

Sending downlink information to the terminal device, where the downlink information is associated with the first reference signal.
The method according to claim 13 or 14, wherein the candidate reference signal information includes one or more of the following: path loss information, index of the second reference signal, back-off power corresponding to the reference signal, The measurement result of the reference signal.
A communication device, characterized in that it comprises a sending unit and a receiving unit;

The sending unit is configured to send a message 1 to a network device, where the message 1 is associated with a first reference signal;

The receiving unit is configured to receive message 2 from the network device, where the message 2 is associated with the first reference signal;

The sending unit is further configured to send a message 3 to the network device, where the message 3 includes candidate reference signal information, and the candidate reference signal information is used to determine a second reference signal;

The receiving unit is further configured to receive a message 4 from the network device, where the message 4 is associated with the second reference signal;

Wherein, the first reference signal and the second reference signal are synchronization signal blocks and belong to the same synchronization signal block period.
The device according to claim 16, characterized in that it comprises one or more of the following:

The sending unit is further configured to send uplink information to the network device, where the uplink information is associated with the first reference signal;

The receiving unit is further configured to receive downlink information from the network device, where the downlink information is associated with the second reference signal;

The sending unit is further configured to send uplink information to the network device, where the uplink information is associated with the second reference signal;

The receiving unit is further configured to receive downlink information from the network device, where the downlink information is associated with the first reference signal.
The apparatus according to claim 16, wherein the message 2 is used to indicate that the reference signal associated with the message 3 is the first reference signal.
The device according to any one of claims 16-18, further comprising a processing unit;

The processing unit is configured to determine the first reference signal from multiple reference signals according to the measurement result of the reference signal and/or the back-off power corresponding to the reference signal.
The apparatus according to claim 19, wherein the candidate reference signal information includes one or more of the following: path loss information, an index of the second reference signal, a backoff power corresponding to the reference signal, The measurement result of the reference signal.
A communication device, characterized in that it comprises a sending unit, a receiving unit and a processing unit;

The receiving unit is configured to receive a message 1 from a terminal device, and the message 1 is associated with a first reference signal;

The sending unit is configured to send a message 2 to the terminal device, where the message 2 is associated with the first reference signal;

The receiving unit is further configured to receive a message 3 from the terminal device, where the message 3 includes candidate reference signal information;

The processing unit is configured to determine a second reference signal according to the candidate reference signal information;

The sending unit is further configured to send a message 4 to the terminal device, where the message 4 is associated with the second reference signal;

Wherein, the first reference signal and the second reference signal are synchronization signal blocks and belong to the same synchronization signal block period.
The device according to claim 21, characterized in that it comprises one or more of the following:

The receiving unit is further configured to receive uplink information from the terminal device, where the uplink information is associated with the first reference signal;

The sending unit is further configured to send downlink information to the terminal device, where the downlink information is associated with the second reference signal;

The receiving unit is further configured to receive uplink information from the terminal device, where the uplink information is associated with the second reference signal;

The sending unit is further configured to send downlink information to the terminal device, where the downlink information is associated with the first reference signal.
The apparatus according to claim 21, wherein the message 2 is used to indicate that the reference signal associated with the message 3 is the first reference signal.
The apparatus according to any one of claims 21-23, wherein the candidate reference signal information includes one or more of the following: path loss information, an index of the second reference signal, and the reference signal corresponds to The back-off power of the reference signal is the measurement result of the reference signal.
A communication device, characterized in that it comprises a sending unit and a receiving unit;

The sending unit is configured to send a message A to a network device, the message A is associated with a first reference signal; the message A includes candidate reference signal information, and the candidate reference signal information is used to determine a second reference signal;

The receiving unit is configured to receive a message B from the network device, where the message B is associated with the second reference signal;

Wherein, the first reference signal and the second reference signal are synchronization signal blocks and belong to the same synchronization signal block period.
The device according to claim 25, characterized in that it comprises one or more of the following:

The sending unit is further configured to send uplink information to the network device, where the uplink information is associated with the first reference signal;

The receiving unit is further configured to receive downlink information from the network device, where the downlink information is associated with the second reference signal;

The sending unit is further configured to send uplink information to the network device, where the uplink information is associated with the second reference signal;

The receiving unit is further configured to receive downlink information from the network device, where the downlink information is associated with the first reference signal.
The apparatus according to claim 25 or 26, wherein the candidate reference signal information includes one or more of the following: path loss information, an index of the second reference signal, and backoff power corresponding to the reference signal, The measurement result of the reference signal.
A communication device, characterized by comprising a receiving unit, a sending unit, and a processing unit;

The receiving unit is configured to receive a message A from a terminal device, the message A is associated with a first reference signal; the message A includes candidate reference signal information;

The processing unit is configured to determine a second reference signal according to the candidate reference signal information;

The sending unit is configured to send a message B to the terminal device, where the message B is associated with the second reference signal;

Wherein, the first reference signal and the second reference signal are synchronization signal blocks and belong to the same synchronization signal block period.
The device according to claim 28, characterized in that it comprises one or more of the following:

The receiving unit is further configured to receive uplink information from the terminal device, where the uplink information is associated with the first reference signal;

The sending unit is further configured to send downlink information to the terminal device, where the downlink information is associated with the second reference signal;

The receiving unit is further configured to receive uplink information from the terminal device, where the uplink information is associated with the second reference signal;

The sending unit is further configured to send downlink information to the terminal device, where the downlink information is associated with the first reference signal.
The apparatus according to claim 28 or 29, wherein the candidate reference signal information includes one or more of the following: path loss information, an index of the second reference signal, and backoff power corresponding to the reference signal, The measurement result of the reference signal.
A communication device, characterized by comprising a processor and a transceiver, the processor uses the transceiver to execute the method according to any one of claims 1-5, or execute any one of claims 10-12 The method described in the item.
A communication device, characterized by comprising a processor and a transceiver, the processor uses the transceiver to execute the method according to any one of claims 6-9, or execute any one of claims 13-15 The method described in the item.
A communication device, characterized in that it comprises a processor and an interface, and the processor executes the method according to any one of claims 1-5 or executes the method according to any one of claims 10-12 through the interface. The method described.
A communication device, characterized by comprising a processor and an interface, the processor uses the interface to execute the method according to any one of claims 6-9, or executes the method according to any one of claims 13-15 The method described.
A communication device, characterized by comprising a processor, when the processor calls a computer program/instruction in the memory, the method according to any one of claims 1-5 is executed, or as claimed in claim 10- The method described in any one of 12 is executed.
A communication device, characterized by comprising a processor, when the processor calls a computer program/instruction in the memory, the method according to any one of claims 6-9 is executed, or according to claim 13- The method described in any one of 15 is executed.
A communication device, characterized by comprising a processor and a memory, the memory is used to store computer programs/instructions, when the processor calls the computer programs/instructions in the memory, the communication device executes The method according to any one of claims 1-5, or the method according to any one of claims 10-12.
A communication device, characterized by comprising a processor and a memory, the memory is used to store a computer program, and when the processor calls the computer program/instruction in the memory, the communication device executes as claimed in claim 6. -9 The method according to any one of claims 13-15, or the method according to any one of claims 13-15.
A computer-readable storage medium, wherein the computer-readable storage medium comprises a computer program/instruction, when the computer program/instruction is run on a computer, the computer is caused to execute any of claims 1-5 The method according to one, or the method according to any one of claims 10-12.
A computer-readable storage medium, wherein the computer-readable storage medium includes a computer program/instruction, when the computer program/instruction is run on a computer, the computer can execute any of claims 6-9. The method of one or the method of any one of claims 13-15.