WO2023125222A1

WO2023125222A1 - Communication method and device

Info

Publication number: WO2023125222A1
Application number: PCT/CN2022/140979
Authority: WO
Inventors: 李锐杰; 官磊; 李胜钰
Original assignee: 华为技术有限公司
Priority date: 2021-12-30
Filing date: 2022-12-22
Publication date: 2023-07-06
Also published as: CN116437471A

Abstract

The present application discloses a communication method and device. The method comprises: a terminal receiving first common information corresponding to a plurality of pieces of second common information; and the terminal receiving one or more of the plurality of pieces of second common information, and transmitting a random access channel, wherein at least one of a time-frequency resource, a sequence, and a spatial domain configuration of the random access channel transmitted by the terminal is determined according to the second common information received by the terminal.

Description

Communication method and device

technical field

The embodiments of the present application relate to the field of wireless communication, and in particular, to a random access method and device.

Background technique

In a communication system, compared with terminal equipment, when transmitting signals, a base station can often use higher transmission power and more transmission antennas. Therefore, compared with downlink communication, the coverage of uplink communication is often poor. Therefore, uplink communication is often the bottleneck of communication. During the current initial access process, especially for terminals at the edge of a cell, the RACH signal sent by them is weak, so that the terminal may not be able to access the base station in time. affect the communication quality. Therefore, improving the uplink coverage in the initial access stage is an urgent problem to be solved.

Contents of the invention

The present application provides a communication method and a communication device, which are used to improve uplink coverage during an initial access process.

In a first aspect, a communication method is provided, and the method may be executed by a terminal device, or may be executed by a module or a chip in the terminal device. The following describes the communication device as an example of a terminal device. The method includes: the terminal device receives the first public information, the first public information corresponds to H pieces of second public information, the terminal device receives the third public information, and the third public information Belonging to H pieces of second public information, H is a positive integer greater than or equal to 2. The terminal device sends the first random access channel RACH, and one or more of time-frequency resources, sequences, and airspace configurations used for sending the RACH are determined through the third public information.

In an optional manner, the communication method further includes that the terminal device receives first indication information, where the first indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is one of the H pieces of second public information The reference time-frequency resource of the second public information.

In an optional manner, the time-frequency resources of the H pieces of second public information are determined according to the first time-frequency resource referring to the second public information.

In an optional manner, the time-frequency resource referring to the second public information is the time-frequency resource with the smallest frequency-domain resource index among the H time-frequency resources of the second public information.

In an optional manner, the time-frequency resources of the H second public information are continuous in the frequency domain, or, the time-frequency resources of two adjacent system information in the H second public information are in the frequency domain Discontinuous.

In an optional manner, the time-frequency resources of two adjacent pieces of second public information among the H pieces of second public information are separated by Y resource blocks, and Y is a positive integer.

In an optional manner, the first indication information is also used to indicate the H; or, the time-frequency resource of the downlink control channel PDCCH for scheduling the third common information is determined through the first control resource set and/or the first search space , H corresponds to the first set of control resources and/or the first search space.

Through the above method, H corresponds to the first set of control resources and/or the first search space, so after determining the first set of control resources and/or the first search space, H can be determined correspondingly, reducing the additional indication H s expenses.

In an optional manner, the terminal device sends the first RACH through one or more RACH transmission opportunities in the first RACH transmission opportunity set, and the first RACH transmission opportunity set is one of the H RACH transmission opportunity sets One, the H RACH transmission opportunity sets include M RACH transmission opportunities, N is a positive integer, and M is a positive integer greater than or equal to N.

In an optional manner, the first public information corresponds to the M RACH transmission opportunities, the H RACH transmission opportunity sets are in one-to-one correspondence with the H second public information, and the first RACH transmission The opportunity set is a RACH transmission opportunity set corresponding to the third public information in the H pieces of second public information.

In an optional manner, the terminal device sends the first RACH through a first RACH transmission opportunity and a first preamble, the first RACH transmission opportunity corresponds to Q pieces of fourth public information, and the Q pieces of fourth public information The information includes the first public information, wherein the first RACH transmission opportunity corresponds to K preambles, the K preambles belong to Q preamble sets, and the Q preamble sets and the Q preamble sets The fourth public information corresponds one-to-one, the first public information corresponds to the first preamble set in the Q preamble sets, and the H second public information corresponds to the first preamble set in the first preamble set H preamble subsets, the third public information in the H second public information corresponds to the first preamble subset in the H preamble subsets, the first preamble belongs to the first preamble collection of codes.

Through the above method, the terminal device determines the transmission opportunity and/or preamble sequence corresponding to the first RACH according to the first public information and/or the third public information. By grouping RACH transmission opportunities by the first public information and/or the third public information, different terminal devices may correspond to different sets of RACH transmission opportunities, thereby reducing conflicts when different terminal devices transmit RACH.

In an optional manner, the airspace configuration in which the terminal device sends the first RACH is the same as the airspace configuration in which the terminal device receives the third public information.

In an optional manner, the first public information is received through a first beam, and the third public information is received through a second beam, where a width of the first beam is greater than a width of the second beam.

Through the above method, the terminal device selects a narrower beam to send the first RACH, which can improve the receiving strength of the first RACH, thereby improving the performance of the first random access channel RACH.

In an optional manner, the first public information includes at least one of a synchronization signal and a physical broadcast channel PBCH. The H pieces of second public information are system information block 1SIB1.

In an optional manner, the first public information is system information, and the second public information includes at least one of a synchronization signal and a physical broadcast channel PBCH.

In an optional manner, the first public information is a system information block 1SIB1.

In a second aspect, a communication method is provided, and the method may be executed by a network device, or may be executed by a module or a chip in the network device. The following describes the communication device as an example of a network device. The method includes: the network device sends first public information, the first public information corresponds to H pieces of second public information, the network device sends third public information, and the The third public information belongs to the H pieces of second public information, and H is a positive integer greater than or equal to 2. The network device receives the first random access information RACH, and one or more of the time-frequency resources, sequences, and airspace configurations used by the network device to receive the RACH are determined by the third public information.

In an optional manner, the network device sends first indication information, where the first indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is a reference in the H pieces of second public information The time-frequency resource of the second public information.

In an optional manner, the airspace configuration in which the network device receives the first RACH is the same as the airspace configuration in which the network device receives the third public information.

In an optional manner, the first public information is sent through a third beam, and the third public information is sent through a fourth beam, where a width of the third beam is greater than a width of the fourth beam.

In an optional manner, the coverage of the H fourth beams is greater than or equal to the coverage of the third beam.

Through the above method, the coverage of the second public information sent by the network device can be guaranteed.

For the method described in the second aspect, the beneficial effects of the method can be referred to in the first aspect, which will not be repeated here. In this method, the corresponding optional manners of the first public information or the second public information or the first RACH can also refer to the first aspect, which will not be repeated here.

In a third aspect, a communication device is provided for implementing the above various methods. The communication device may be the terminal device in the above-mentioned first aspect or the second aspect, or a device including the above-mentioned terminal device, or a device included in the above-mentioned terminal device, such as a chip. The communication device includes a corresponding module or unit for implementing the above method, and the module or unit may be implemented by hardware, software, or by executing corresponding software by hardware. The hardware or software includes one or more modules or units corresponding to the above functions.

In an optional manner, the communication device may include a processing module and a transceiver module. The transceiver module, which may also be referred to as a transceiver unit, is configured to implement the sending and/or receiving function in any implementation manner in the first aspect or the second aspect. The transceiver module may be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface. The processing module may be used to implement the processing functions in any of the above aspects and any possible implementation manners thereof.

In an optional manner, the transceiver module includes a sending module and a receiving module, which are respectively configured to implement the sending and receiving functions in any implementation manner in the first aspect above.

In a fourth aspect, a communication device for implementing the above various methods is provided. The communication device may be the network device in the second aspect above, or a device including the above network device, or a device included in the above network device, such as a chip. The communication device includes a corresponding module or unit for implementing the above method, and the module or unit may be implemented by hardware, software, or by executing corresponding software by hardware. The hardware or software includes one or more modules or units corresponding to the above functions.

In an optional manner, the communication device may include a processing module and a transceiver module. The transceiver module, which may also be referred to as a transceiver unit, is configured to implement the sending and/or receiving function in any implementation manner in the third aspect or the fourth aspect. The transceiver module may be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface. The processing module may be used to implement the processing function in any implementation manner in the third aspect or the fourth aspect.

In an optional manner, the transceiver module includes a sending module and a receiving module, which are respectively configured to implement the sending and receiving functions in any implementation manner in the second aspect above.

In a fifth aspect, a communication device is provided, including: a processor and an interface circuit; the interface circuit is used to receive signals from other communication devices other than the communication device and transmit them to the processor, or transmit signals from the processor The signal is sent to other communication devices other than the communication device; the processor uses a logic circuit or executes code instructions, so that the communication device executes the method described in any implementation manner in the first aspect above. The communication device may be the terminal device in the above first aspect, or a device including the above terminal device, or a device included in the above terminal device, such as a chip.

In a sixth aspect, there is provided a communication device, including: a processor and an interface circuit, the interface circuit is used to receive signals from other communication devices other than the communication device and transmit them to the processor, or transmit signals from the processor The signal is sent to other communication devices other than the communication device; the processor uses a logic circuit or executes code instructions, so that the communication device executes the method described in any implementation manner in the second aspect above. The communication device may be the network device in the second aspect above, or a device including the above network device, or a device included in the above network device, such as a chip.

In the seventh aspect, there is provided a computer-readable storage medium, the computer-readable storage medium stores instructions, and when the computer-readable storage medium is run on the communication device, the communication device can execute any implementation in the first aspect or the second aspect above. method described in the method.

In an eighth aspect, a computer-readable storage medium is provided, the computer-readable storage medium stores instructions, and when it is run on a communication device, the communication device can execute any implementation in the third or fourth aspect above. method described in the method.

In a ninth aspect, a computer program product is provided, which, when run on a computer, causes the computer to execute the method described in any implementation manner in the above first aspect.

In a tenth aspect, a computer program product is provided, which, when running on a computer, causes the computer to execute the method described in any implementation manner in the above second aspect.

In an eleventh aspect, a communication device is provided, including: a processor, the processor is coupled with a memory, and the memory is used to store instructions, and when the instructions are executed by the processor, the communication device performs the above-mentioned first aspect or The method described in any implementation manner in the second aspect.

In a twelfth aspect, there is provided a communication device, including: a processor, the processor is coupled with a memory, and the memory is used to store an instruction, and when the instruction is executed by the processor, the communication device executes the third aspect or The method described in any implementation manner in the fourth aspect.

A thirteenth aspect provides a communication system, including at least one communication device as described in the fifth aspect and at least one communication device as described in the sixth aspect, when at least one communication device as described in the fifth aspect and at least one When a communication device according to the sixth aspect is running in the system, it is used to implement the method in any implementation manner of the first aspect to the fourth aspect above.

Description of drawings

FIG. 1 is a schematic structural diagram of a mobile communication system applied in an embodiment of the present application;

FIG. 2 is a schematic flowchart of a communication method provided in an embodiment of the present application;

Figure 3 is a schematic diagram of the relationship between the first beam and the second beam provided by this application;

FIG. 4 is a schematic diagram of a relationship between time-frequency resources of H pieces of second public information provided by the present application;

FIG. 5 is a schematic diagram of another relationship between time-frequency resources of H second public information provided by the present application;

FIG. 6 is a schematic diagram of a communication device provided by the present application;

FIG. 7 is another schematic diagram of a communication device provided by the present application.

Detailed ways

FIG. 1 is a schematic structural diagram of a communication system 1000 applied in an embodiment of the present application. As shown in FIG. 1 , the communication system includes a radio access network 100 and a core network 200 , and optionally, the communication system 1000 may also include the Internet 300 . Wherein, the radio access network 100 may include at least one radio access network device (such as 110a and 110b in FIG. 1 ), and may also include at least one terminal (such as 120a-120j in FIG. 1 ). The terminal is connected to the wireless access network device in a wireless manner, and the wireless access network device is connected to the core network in a wireless or wired manner. The core network equipment and the wireless access network equipment can be independent and different physical equipment, or the functions of the core network equipment and the logical functions of the wireless access network equipment can be integrated on the same physical equipment, or it can be a physical equipment It integrates some functions of core network equipment and some functions of wireless access network equipment. Terminals and wireless access network devices may be connected to each other in a wired or wireless manner. FIG. 1 is only a schematic diagram. The communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in FIG. 1 .

The radio access network equipment can be a base station (base station), an evolved base station (evolved NodeB, eNodeB), a transmission reception point (transmission reception point, TRP), and the next generation in the fifth generation (5th generation, 5G) mobile communication system Base station (next generation NodeB, gNB), the next generation base station in the sixth generation (6th generation, 6G) mobile communication system, the base station in the future mobile communication system or the access node in the WiFi system, etc.; it can also complete the base station part A functional module or unit, for example, can be a centralized unit (central unit, CU) or a distributed unit (distributed unit, DU). The CU here completes the functions of the radio resource control protocol and the packet data convergence protocol (PDCP) of the base station, and also completes the function of the service data adaptation protocol (SDAP); the DU completes the functions of the base station The functions of the radio link control layer and the medium access control (medium access control, MAC) layer can also complete the functions of part of the physical layer or all of the physical layer. For the specific description of the above-mentioned protocol layers, you can refer to the third generation partnership project (3rd generation partnership project, 3GPP) related technical specifications. The radio access network device may be a macro base station (such as 110a in Figure 1), a micro base station or an indoor station (such as 110b in Figure 1), or a relay node or a donor node. The embodiment of the present application does not limit the specific technology and specific equipment form adopted by the radio access network equipment. For ease of description, a base station is used as an example of a radio access network device for description below. For convenience of description, a base station is taken as an example for detailed description below.

A terminal device may also be called a terminal, a user equipment (user equipment, UE), a mobile station, a mobile terminal, and the like. Terminals can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things ( internet of things, IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearables, smart transportation, smart city, etc. Terminals can be mobile phones, tablet computers, computers with wireless transceiver functions, wearable devices, vehicles, drones, helicopters, airplanes, ships, robots, robotic arms, smart home devices, etc. The embodiment of the present application does not limit the specific technology and specific device form adopted by the terminal. For convenience of description, a terminal is taken as an example for detailed description below.

Base stations and terminals can be fixed or mobile. Base stations and terminals can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on aircraft, balloons and artificial satellites. The embodiments of the present application do not limit the application scenarios of the base station and the terminal. For the convenience of description, the terminal device will be referred to as the terminal for short in the following for detailed description.

The roles of the base station and the terminal can be relative. For example, the helicopter or UAV 120i in FIG. base station; however, for

base station

110a, 120i is a terminal, that is, communication between 110a and 120i is performed through a wireless air interface protocol. Of course, communication between 110a and 120i may also be performed through an interface protocol between base stations. In this case, compared to 110a, 120i is also a base station. Therefore, both the base station and the terminal can be collectively referred to as a communication device, 110a and 110b in FIG. 1 can be referred to as a communication device with a base station function, and 120a-120j in FIG. 1 can be referred to as a communication device with a terminal function.

The communication between the base station and the terminal, between the base station and the base station, and between the terminal and the terminal can be carried out through the licensed spectrum, the communication can also be carried out through the unlicensed spectrum, and the communication can also be carried out through the licensed spectrum and the unlicensed spectrum at the same time; Communications may be performed on frequency spectrums below megahertz (gigahertz, GHz), or communications may be performed on frequency spectrums above 6 GHz, or communications may be performed using both frequency spectrums below 6 GHz and frequency spectrums above 6 GHz. The embodiments of the present application do not limit the frequency spectrum resources used for wireless communication.

In the embodiments of the present application, the functions of the base station may also be performed by modules (such as chips) in the base station, or may be performed by a control subsystem including the functions of the base station. The control subsystem including base station functions here may be the control center in the above application scenarios such as smart grid, industrial control, intelligent transportation, and smart city. The functions of the terminal may also be performed by a module (such as a chip or a modem) in the terminal, or may be performed by a device including the terminal function.

In this application, the base station sends a downlink signal or downlink information to the terminal, and the downlink information is carried on the downlink channel; the terminal sends an uplink signal or uplink information to the base station, and the uplink information is carried on the uplink channel. In order to communicate with the base station, the terminal needs to establish a wireless connection with the cell controlled by the base station. A cell with which a terminal has established a wireless connection is called a serving cell of the terminal. When the terminal communicates with the serving cell, it will also be interfered by signals from neighboring cells.

(1) Beam

Beams can be understood as the airspace direction of signal transmission, which can be divided into sending beams and receiving beams. Different spatial filtering configurations correspond to different beams, and different beams transmit in different spatial directions. The width of the beam may refer to the width of the main lobe of the antenna pattern of the transmitting or receiving antenna. The larger the beam width, the wider the energy needs to be distributed for the transmitting end, and the smaller the energy that can be received for the receiving end.

(2) Airspace configuration

It is used to configure the spatial domain behavior of sending or receiving, including at least one of parameters such as spatial filtering configuration and spatial filter. A spatial domain filter may also be referred to as a spatial domain transmission filter. For example, the same spatial domain configuration can be understood as the use of spatial domain filters with the same parameters for signal transmission. Alternatively, the airspace configuration can also be understood as signal transmission using the same quasi-colocation properties, or, the same airspace configuration can also be understood as the corresponding airspace configuration for signal transmission is the same. Beams and airspace configurations are often corresponding. For example, when the airspace filtering configurations are different, the beam and airspace configurations are also different. In this application, when describing the airspace behavior of sending and receiving, the airspace configuration can be replaced with the beam. Optionally, the same spatial configuration in this application can be understood as the same beam width, the same spatial filtering configuration, the same spatial filtering parameters, or satisfying quasi co-located (QCL). For QCL, if channel 1 and channel 2 satisfy the QCL, it can be understood that the channel characteristics of channel 1 are obtained through channel 2. The channel characteristics may include one or more items of Doppler shift, Doppler spread, average delay, delay spread and spatial domain parameters.

(3) Synchronization signal and physical broadcast channel block (synchronize signal and physical broadcast channel, SSB)

The SSB is sent by the base station, and correspondingly, the SSB is received or detected by the terminal. Different SSBs in the same cell are identified by different SSB indexes, and different SSBs transmit in different airspace directions. An SBB pattern includes multiple different SSBs, or in other words, an SSB pattern corresponds to multiple SSB indexes.

SSB consists of two parts, namely synchronization signal (synchronize signal, SS) and physical broadcast channel block (physical broadcast channel, PBCH), where SS includes primary synchronization signal (primary synchronize signal, PSS) and secondary synchronization signal (secondary synchronize signal , SSS), therefore, it can also be understood that SSB includes three parts. The SSB mainly has two functions. The first function includes cell synchronization and master information block (MIB) acquisition, and the second function includes beam training. The MIB is carried and transmitted on the PBCH.

For function one, SS and PBCH are jointly used to obtain cell identity (cell identity, cell ID), downlink timing, and system information of the terminal access cell. It specifically includes: the PSS and SSS carry a physical cell identifier (PCI), and the terminal acquires the PCI by detecting the PSS and SSS. PBCH will carry SSB index (SSB index), each SSB index corresponds to a transmission position, and the terminal completes downlink timing synchronization by detecting SSB index and detection time.

For function two, the terminal can detect the SSB, select the best SSB, and complete the training of the wide beam on the base station side. The wide beam on the base station side can also be understood as the transmit beam on the base station side. An SSB with the same index is received by different receiving beams to complete the narrow training on the terminal side. The narrow beam on the terminal side can also be understood as the receiving beam on the terminal side. The terminal receives an SSB with the same index using different receiving beams, that is, the terminal uses multiple receiving beams to receive the SSB sent by the same transmitting beam from the base station, selects the best receiving beam, and completes the training of receiving beams.

(4) system information block (system information block, SIB)

System cells are broadcast through system information blocks, which group system cells of the same type together. The system information or the third public information in this application can be SIB1, and SIB1 can be understood as the first system information block sent after the MIB, and the system information or the third public information in this application can also be considered as the remaining minimum system information ( remaining minimum system information, RMSI), or, the system information or the third public information in this application can be understood as the system information including the time-frequency resource information of the RACH, or, it can be understood as including the primary cell (primary cell, The system information of configuration information of the PCell) facilitates the terminal device to complete uplink timing synchronization through random access. Thus entering the connection state.

(5) Public information

Public information can be understood as non-private information, or as information sent by one communication device to multiple communication devices. For example, taking the communication system shown in FIG. 1 as an example, the information sent by the base station to all terminals in the cell is public information. Alternatively, the information sent by the base station to a group of terminals in the cell is also public information. Optionally, the public information can be regarded as the same information transmitted by the base station to a group of terminal devices. For example, public information may be system information, synchronization signals, etc.

(6) Control resource set (control resource set, CORESET)

CORESET is used to indicate the frequency domain position of the physical downlink control channel (PDCCH) and the number of time domain symbols occupied by the PDCCH in the time domain. Different CORESETs are distinguished by the CORESET identifier. For example, the number of time domain symbols occupied by the PDCCH in the time domain may be 1, 2 or 3. Optionally, the network device may pre-configure different control resource set identifiers for each control resource set, so as to distinguish different control resource sets according to different control resource set identifiers. For example, taking the control resource set including control resource set 1 and control resource set 2 as an example, the control resource set ID of control resource set 1 can be set as p1, and the control resource set ID of control resource set 2 can be set as p2.

(7) Search space (search space, SS) set

A set of search spaces may correspond to a set of control resources. Wherein, the search space set may be of two types: a common search space (common search space, CSS) set or a terminal equipment specific search space (UE-specific search space, USS) set. Different search space sets are distinguished by search space set identifiers.

For example, taking the search space set including search space set 1 and search space set 2 as an example, the search space set ID of search space set 1 can be set as s1, and the search space set ID of search space set 2 can be set as s2. It should be noted that a set of search spaces can also be described as a search space. That is to say, "search space" and "search space set" in this embodiment of the present application may be interchanged. For the convenience of description, SS refers to the search space and the set of search spaces below.

Each search space is used to indicate the time domain position where the PDCCH is located, and the configuration information of each search space may include parameter information such as a search space identifier and a control resource set identifier corresponding to the search space. The search space and the set of control resources jointly indicate the time-frequency location of the PDCCH.

(8) Random access channel (random access channel, RACH)

The random access channel can also be understood as a physical random access channel, which is one of the channels required for a terminal to randomly access a base station. After obtaining the configuration of the RACH, the terminal may send a RACH preamble (preamble) on the time-frequency resource of the RACH. The RACH is sent through the RACH transmission opportunity, and one RACH transmission opportunity can be understood as a piece of time-frequency resource that can be used to send the RACH. For example, multiple RACH transmission opportunities may be indicated through the indication information of the RACH time-frequency resource in SB1. In this application, time-frequency resources may include time-domain resources but not frequency-domain resources, may include frequency-domain resources but not time-domain resources, or may include both time-domain resources and frequency-domain resources.

Currently, the base station sends multiple SSBs, including the base station sending SSB1 through beam 1, and the terminal can receive SSB1 through multiple receiving beams, thereby selecting beam 2 as the best receiving beam from multiple receiving beams, and completing the receiving beam of the terminal train. Through beam training, if beam 1 corresponds to airspace configuration 1, the base station sends SSB 1 through airspace configuration 1, beam 2 corresponds to airspace configuration 2, and the terminal receives SSB1 through airspace configuration 2. The corresponding time-frequency position receives SIB1, and sends RACH at the time-frequency position corresponding to SSB 1 through airspace configuration 2.

(9)Kssb

Kssb is used to indicate the zero subcarrier of SSB and

The interval between the zero subcarriers of SSB, or understood as, Kssb represents the zero subcarriers of SSB and

The number of subcarriers that differ between the zero subcarriers of .

Indicates the common resource block (common resource block, CRB) to which the first subcarrier of the SSB belongs. Kssb can also be understood as the gap between the first subcarrier actually occupied by the SSB and the first subcarrier of the CRB to which the first subcarrier actually occupied by the SSB belongs. In the current protocol, the Kssb is indicated through the PBCH, part of the information of the Kssb is carried in the MIB information in the PBCH, and the other part is indicated through the payload of the PBCH.

It can be seen from the above description that currently, since the airspace configuration used by the terminal to send RACH is the same as the airspace configuration used by the terminal to receive SSB, correspondingly, the beam width used by the terminal to send RACH is the same as the beam width used by the terminal to receive SSB. However, the transmit power of the base station is greater than the transmit power of the terminal. The transmit power of the base station is relatively large, while the transmit power of the terminal is small. The terminal uses the same beam width as receiving SSB and SIB1 to transmit RACH, resulting in weak RACH signal and poor uplink coverage. . For example, for a terminal at the edge of a cell, when the terminal at the edge of the cell transmits RACH using a beam with the same width as receiving SSB and SIB1, the RACH signal is weak, so that the base station may not be able to obtain RACH information in time, and thus cannot complete the initial access. Failure to access the base station in time affects communication quality.

For this reason, the present application proposes a method for improving uplink coverage, which is conducive to improving the signal strength of RACH received by the base station, thereby improving the success rate of initial access and improving communication performance.

Based on the network architecture provided in FIG. 1 , the following describes the random access method provided in this application in conjunction with FIG. 2 . The base station in FIG. 2 may be the radio

access network device

110a or 110b in FIG. 1 , and the terminals may be 120a-120j in FIG. 1 .

S201: The base station sends first public information to the terminal, where the first public information corresponds to H pieces of second public information. Correspondingly, the terminal receives the first public information.

The first public information may be information used by terminals to perform time synchronization and/or frequency synchronization. For example, the first public information may be one or more of synchronization signal, PBCH, primary system information and SIB1.

The synchronization signal in this application may include at least one of SSS or PSS. When the first public information includes PSS, SSS, and PBCH, the first public information is SSB.

S202: The base station sends H pieces of second public information to the terminal, where the H pieces of second public information include third public information, correspondingly, and the third public information. Correspondingly, the terminal receives one or more pieces of second public information among the H pieces of second public information as third public information.

The second public information may be information that the terminal device performs beam measurement. For example, the second public signal may also be one or more of a synchronization signal, PBCH, primary system information and SIB1, and the second public information is different from the first public information.

Specifically, the terminal receives the first public information through the first airspace configuration, and receives the third public information through the second airspace configuration. The first airspace configuration and the second airspace configuration may be the same or different.

When the first airspace configuration and the second airspace configuration are the same, the beams corresponding to the two airspace configurations can be both narrow beams, which can be understood as having a width smaller than that corresponding to beam 2 in the terminology introduction part (7).

When the first airspace configuration is different from the second airspace configuration, beamwidths corresponding to the two airspace configurations are also different.

The base station sends the first public information to the terminal through the third airspace configuration, and sends the third public information to the terminal through the fourth airspace configuration. The third airspace configuration and the fourth airspace configuration may be the same or different.

When the third airspace configuration is the same as the fourth airspace configuration, the beams corresponding to the two airspace configurations can be both narrow beams, which can be understood as having a width smaller than that corresponding to beam 1 in the terminology introduction part (7).

When the third airspace configuration is different from the fourth airspace configuration, beamwidths corresponding to the two airspace configurations are also different. That is, the base station may use different airspace configurations to respectively send the first public information and the third public information, and the terminal may also use different airspace configurations to respectively receive the first public information and the third public information. Wherein, the first airspace configuration and the third airspace configuration may be the same or different. The second airspace configuration and the fourth airspace configuration may be the same or different.

In the following, the first airspace configuration is different from the second airspace configuration, and the fourth airspace configuration is different from the fifth airspace configuration as an example for further introduction.

In an optional manner, for the terminal, the first airspace configuration corresponds to the first beam, and the second airspace configuration corresponds to the second beam. Wherein, the width of the first beam is smaller than the width of the second wave number, that is, the width of the beam through which the terminal receives the first public information is greater than the width of the beam through which the terminal receives the third public information. For the base station, the third airspace configuration corresponds to the third beam, and the fourth airspace configuration corresponds to the fourth beam, wherein the width of the third beam is greater than the width of the fourth beam, that is, the width of the beam through which the base station sends the first public information It is larger than the width of the beam through which the base station sends the third public information.

In an optional manner, the first public information corresponds to H pieces of second public information, where the H pieces of second public information include the third public information. Further optionally, the H pieces of second public information are all SIB1, and at this time the third public information is also SIB1. When the first public information corresponds to H pieces of second public information, optionally, the width of the first beam is greater than the width of the second beam, and the sum of the coverage of the H second wave numbers is equal to or greater than the coverage of the first beam, That is, the coverage of the H pieces of second public information is not smaller than the coverage of the first public information. Optionally, in this application, the coverage may refer to the beam width, for example, the sum of the beam widths of H second wave numbers is greater than the beam width of the first beam.

Regarding how to determine H, there are several optional ways as follows.

In the first optional mode, H is predefined by the protocol.

In the second optional manner, H is indicated by the base station through information. When H is indicated by the base station through information A, in an optional manner, the information A indicated by the base station to H is carried in the MIB. Alternatively, the base station indicates that the information A of H includes at least one bit, and different status values of the at least one bit indicate Kssb and H respectively. Alternatively, information A is used to indicate Kssb at the same time.

In a third optional manner, H corresponds to the control resource set and/or search space corresponding to the PDCCH that schedules one or more pieces of second public information in the H pieces of second public information, for example, H corresponds to the scheduling of the third public information The information corresponds to the control resource set and/or the search space corresponding to the time-frequency resource of the PDCCH.

As shown in Figure 3, an example in which the first public information corresponds to H second public information, in Figure 3, the first public information corresponds to four second public information, the width of the first beam is greater than the width of the second beam, and the four The sum of the coverage of the two wave numbers is greater than the coverage of the first beam.

The H pieces of second public information are sent by the base station, and correspondingly, the time-frequency resources of the H pieces of second public information are configured by the base station and indicated to the terminal by the base station through signaling. Several ways to indicate the time-frequency resources of the H pieces of second public information are given below.

Manner 1: The base station sends first indication information, where the first indication information indicates H time-frequency resources of the second public information one by one. At this time, the terminal receives the first indication information, and can directly acquire H time-frequency resources of the second public information. Based on method 1, optionally, the first indication information may also indicate H, that is, the first indication information may also indicate the number of second public information corresponding to the first public information, or, because the first indication information indicates one by one The time-frequency resources of the H pieces of second public information can be understood at this time as that the first indication information implicitly indicates H, and the first public information is the same as the above-mentioned information A at this time.

Manner 2: The base station sends first indication information, where the first indication information indicates a first index, and the first index corresponds to H time-frequency resources of the second public information. When the values of the first indices indicated by the first indication information are different, the time-frequency resources of the H pieces of second public information are also different. Table 1 shows an example of the first index and the time-frequency resources of the H pieces of second public information.

Table 1

In Table 1, H is 4, that is, the first public information corresponds to 4 second public information. When the first index is 0, that is, the first index is 0 at this time, the time-frequency resources of the first second public information to the fourth second public information are time-frequency resource 1 to time-frequency resource 4 respectively. When the first index is 1, the time-frequency resources of the first second public information to the fourth second public information are time-frequency resource 5 to time-frequency resource 8 respectively. When the first index is 2, the time-frequency resources of the first second public information to the fourth second public information are time-frequency resource 9 to time-frequency resource 12 respectively. When the first index is 3, the time-frequency resources of the first second public information to the fourth second public information are time-frequency resource 13 to time-frequency resource 16 respectively. It should be understood that the time-frequency resource 1 to the time-frequency resource 16 may be different from each other, or there are two or more time-frequency resources in the time-frequency resource 1 to the time-frequency resource 16 that are the same, or, the time-frequency resource 1 to the time-frequency resource In 16, two or more time-frequency resources are partly the same and partly different. For example, the time-frequency resource 1 and the time-frequency resource 6 are the same, or the time-frequency resource 1 and the time-frequency resource 6 are partly the same and partly different. Alternatively, the time-frequency resource 1 is different from any one of the time-frequency resource 2 to the time-frequency resource 16 .

In Table 1, the time-frequency resource 1 and the time-frequency resource 16 may be time-domain resources, and in this case, the frequency-domain resources of the H pieces of second public information may be predefined. Alternatively, the time-frequency resource 1 and the time-frequency resource 16 may be frequency-domain resources, and in this case, the time-domain resources of the H pieces of second public information may be predefined.

Alternatively, in Table 1, the time-frequency resource 1 and the time-frequency resource 16 may be time-domain resources, and in this case, the frequency-domain resources of the H pieces of second public information may be the same. Alternatively, the time-frequency resource 1 and the time-frequency resource 16 may be frequency-domain resources, and in this case, the time-domain resources of the H pieces of second public information may be the same.

Mode 3: The base station sends first indication information, where the first indication information indicates a first time-frequency resource, and the first time-frequency resource is a time-frequency resource referring to the second public information among the H pieces of second public information. At this time, the time-frequency resources of the H pieces of second public information are determined according to the time-frequency resources referring to the second public information. The terminal receives the first indication information, and determines the time-frequency resources of the H pieces of second public information according to the first time-frequency resources. In an optional manner, the reference to the second public information is the earliest second public information in the frequency domain among the H second public information, that is, the time-frequency resource of the reference to the second public information is the H second public information Among the time-frequency resources of the information, the time-frequency resource with the smallest frequency-domain resource index. Based on mode 3, optionally, the first indication information may also indicate H, that is, the first indication information simultaneously indicates the first time-frequency resource and the number of second public information corresponding to the first public information. At this time, the terminal passes the first public information One piece of indication information determines H and H time-frequency resources of the second public information.

In an optional manner, among the H pieces of second public information, the time domain resource of each second public information does not cross a time slot (slot) boundary. For example, the time domain resources of the H pieces of second public information are located in the same time slot. Specifically, crossing a time slot boundary may specifically mean that the time domain resource occupied by each second public information belongs to at least two time slots. For example, a part of the time-domain resource of the second public information belongs to the first time slot, and another part belongs to another time slot. It should be noted that the present application takes a time slot as an example, which may be a frame (frame), a sub-frame (sub-frame) and other time units.

The time-frequency resources of the H pieces of second public information may be independent of each other, or may have a corresponding relationship.

In an optional manner, there is a correspondence between the time-frequency resources of the H pieces of second public information, and the correspondence between the H pieces of second public information may be predefined by a protocol, or may be indicated by the base station through information B. In an optional manner, the information B is carried in the MIB. For example, information B is information A that the base station indicates H to the terminal, or information B and information A are different indication fields in the MIB.

In another optional manner, the information B corresponds to the control resource set and/or search space corresponding to the PDCCH that schedules one or more second public information in the H second public information, for example, the information B corresponds to the scheduling The control resource sets and/or search spaces corresponding to the time-frequency resources of the PDCCH of the three public information correspond. For another example, the information B is the same indication information as the indication information indicating the control resource set and/or the search space.

In an optional manner, the size of the time-domain resources of the H pieces of second public information is the same, and the size of the frequency-domain resources is different, or, the size of the frequency-domain resources of the H pieces of second public information is the same, but the size of the time-domain resources is different, or, The sizes of the time-domain resources and the frequency-domain resources of the H pieces of second public information are the same, that is, the sizes of the time-frequency resources of the H pieces of second public information are the same, hereinafter, the sizes of the time-frequency resources of the H pieces of second public information are the same As an example, several examples of time-frequency resource relationships of H pieces of second public information are given. Example 1, the H pieces of second public information have a relationship of frequency division multiplexing, that is, the time domain resources of the H pieces of second public information are the same, but the frequency domain resources are different. Based on different frequency domain resources, in an optional manner, the time-frequency resources of the H second public information are continuous in the frequency domain, that is, among the H second public information, two adjacent second public information There is no frequency domain gap between them. In another optional manner, among the H pieces of second public information, the time-frequency resources of the H pieces of second public information are discontinuous in the frequency domain. For example, time-frequency resources of two adjacent pieces of second public information among the H pieces of second public information are separated by Y frequency-domain resource blocks in the frequency domain, where Y is a positive integer. The value of Y may be predefined by the protocol, or may be indicated by the base station through signaling. FIG. 4 is a specific example. In FIG. 4, H is 4, the first public information is SSB, and the second public information is system information, that is, one SSB corresponds to 4 system information. The time domain resources of the four pieces of system information are the same, but the frequency domain resources are different. In (a) of FIG. 4 , the time-frequency resources of the four pieces of system information are discontinuous in the frequency domain, and adjacent system information is separated by Y frequency domain resource blocks in the frequency domain. In (b) of FIG. 4 , the time-frequency resources of the four pieces of system information are continuous in the frequency domain, and adjacent system information has no frequency domain interval in the frequency domain. Optionally, the time-domain resource of each of the four pieces of system information shown in FIG. 4 does not cross a time slot boundary.

Optionally, in this application, different frequency domain resources may refer to different sizes of frequency domain resources, or may refer to incomplete overlapping of frequency domain resources.

As shown in Table 2, it is an example in which the H pieces of second public information are in a frequency division multiplexing relationship.

Table 2

In Table 2, the first public information corresponds to 4 second public information, and H is 4. As shown in the first row of Table 2, the frequency domain resources corresponding to the first second public information and the fourth second public information are both frequency domain resource 1, and the corresponding time domain resources are time domain resource 1 to time domain resource 1 respectively. domain resource4. Only the second row and the fourth row in Table 2 are similar to the first row, and will not be repeated here.

Example 2, the H pieces of second public information are time-division multiplexed, that is, the time-domain resources of the H pieces of second public information are different, and the frequency-domain resources are the same. Based on different time-domain resources, in an optional manner, the time-frequency resources of the H second public information are continuous in the time domain, that is, among the H second public information, two adjacent second public information There is no time interval between them. In another optional manner, among the H pieces of second public information, the time-frequency resources of the H pieces of second public information are discontinuous in the time domain. For example, the time-frequency resources of two adjacent second public information among the H pieces of second public information are separated by Y time units in the time domain, where Y is a positive integer, and one time unit can be one symbol or multiple symbols, and one or multiple time slots, one or more subframes, etc., when Y time units are Y symbols, or H pieces of second public information are continuous in the time domain, in an optional manner, H pieces of second public information The information can be located in the same time slot, or in the same subframe. This application does not limit the specific unit of the time unit. FIG. 5 shows a specific example. For example, in 5, the first public information is SSB, and the second public information is system information. In FIG. 5(a), H is 4, that is, one SSB corresponds to 4 system information. The frequency domain resources of the four pieces of system information are the same, but the time domain resources are different, and the time domain resources of the four pieces of system information are discontinuous, and two adjacent pieces of system information are separated by Y time units. In FIG. 5( b ), the time-frequency resources of the four pieces of system information are continuous in the time domain, and there is no time interval between two adjacent pieces of system information. In Figure 5, the time domain resources of the four system information do not cross the time slot boundary, for example, the time domain resource of each system information corresponds to one time slot, and the four system information correspond to four different time slots respectively, and for another example, 4 The time-domain resources of system information are located in the same time slot.

Optionally, in this application, different time domain resources may refer to different sizes of time domain resources, or may refer to incomplete overlap of time domain resources.

As shown in Table 3, it is an example in which the H pieces of second public information are time-division multiplexed.

table 3

In Table 3, the first public information corresponds to 4 second public information, and H is 4. As shown in the first row of Table 3, the time domain resources corresponding to the first second public information and the fourth second public information are both time domain resource 1, and the corresponding frequency domain resources are time domain resource 1 to time domain resource 1 respectively. domain resource4. Only the second row and the fourth row in Table 2 are similar to the first row, and will not be repeated here.

In the foregoing example 1 and example 2, optionally, the time-frequency resources of the H pieces of second public information may also be indicated by the base station to the terminal in the manner shown in Table 1, which will not be repeated here.

In the foregoing FIG. 4 and FIG. 5 , the first public information is SSB, and the second public information is system information as an example for introduction. In another optional mode, the first public information is system information, and the second public information is SSB, that is, one system information corresponds to H SSBs, and some optional modes when one system information corresponds to H SSBs, Reference may be made to the descriptions in FIG. 4 and FIG. 5 , and details are not repeated here.

S203: The terminal sends the first RACH to the base station, and correspondingly, the base station receives the first RACH from the terminal.

Specifically, one or more of the time-frequency resource, sequence, and airspace configuration used by the terminal to send the first RACH is determined through the third public information, or the base station receives the time-frequency resource, sequence, and airspace configuration used by the first RACH One or more items in the configuration are determined through the third public information.

In an optional manner, the airspace configuration in which the terminal sends the first RACH is the same as the airspace configuration in which the terminal receives the third public information. Since the airspace configuration and the beam can be replaced, that is, the terminal uses the second beam receiving the second common signal to send the first RACH. The width of the second beam is smaller than that of the first beam. The terminal transmits the beam of the first RACH, and among the beams receiving the third public information and the beam receiving the first public information, the beam with a smaller width, the narrower the beam, the more concentrated the energy of the terminal sending the first RACH, so as to improve Uplink coverage in the initial access phase.

The airspace configuration of the base station receiving the first RACH is the same as the airspace configuration of the base station sending the third public information, that is, the base station receives the first RACH using the fourth beam that sends the second public signal, and the width of the fourth beam is smaller than that of the third beam. The base station Receive the beam of the first RACH, send the beam of the third public information and the beam of the first public information for the base station, the beam with a smaller width, the narrower the beam, the greater the signal strength of the RACH received by the base station, so as to improve the initial Uplink coverage in the access phase.

As for the time-frequency resource or sequence for the terminal to send the first RACH to be determined according to the third public information, some optional ways are given below.

The RACH needs to be sent or received through RACH transmission occasions (occasions). One RACH transmission occasion can be understood as sending or receiving and can be understood as one or more of time domain resources, frequency domain resources, or sequences used for sending RACH. The base station configures multiple RACH transmission opportunities, wherein the first RACH is sent through the first RACH transmission opportunity. There may be one or multiple first RACH transmissions. Some examples of the terminal sending the first RACH are given below. How the terminal determines the RACH transmission opportunity for sending the first RACH may have the following several examples.

Example A, the terminal sends the first RACH through the first RACH transmission opportunity, the first RACH transmission opportunity belongs to the first RACH transmission opportunity set, and the first RACH transmission opportunity set is one of multiple RACH transmission opportunity sets. The first RACH transmission opportunity set includes M RACH transmission opportunities, and the M RACH transmission opportunities include the first RACH transmission opportunity. It can also be understood that the multiple RACH transmission opportunities configured by the base station can be divided into multiple RACH transmission opportunity sets, and the terminal selects the first RACH transmission opportunity set from the multiple RACH transmission opportunity sets, and uses the first RACH transmission opportunity set One or more RACH transmission opportunities in the M RACH transmission opportunity sets send the first RACH.

In an optional manner, the multiple RACH transmission opportunities configured by the base station are divided into multiple RACH transmission opportunity sets by the number of the largest fourth public information in the cell, and the multiple fourth public information includes the first public information, or, Multiple pieces of fourth information can be understood as first public information with different indexes.

Optionally, the maximum number of fourth public information in the cell may refer to the number of fourth public information sent by the base station, or may refer to the maximum number of fourth public information allowed by the protocol. For example, the first public information is SSB, and the multiple fourth information are multiple SSBs with different indexes. According to the agreement, the maximum number of SSBs allowed to be sent in the cell is 8, and the number of SSBs sent by the base station is 7. At this time, the maximum number of SSBs in the cell can be 8 or 7, which is not limited in this application.

For example, the fourth public information is the SSB, the first public information is the first SSB, and the multiple RACH transmission opportunities configured by the base station are divided into multiple RACH transmission opportunity sets according to the maximum number of SSBs in the cell. For example, the maximum number of SSBs in the cell is D, and the number of RACH transmission opportunities configured by the base station is E, then the E RACH transmission opportunities are divided into D RACH transmission opportunity sets. For example, when E is divisible by D, the number of RACH transmission opportunities in each RACH transmission opportunity set is E/D. When E is not divisible by D, the number of RACH transmission opportunities included in (D-1) RACH transmission opportunity sets in the D RACH transmission opportunity sets is

The number of RACH transmission opportunities included in a remaining RACH transmission opportunity set is

Wherein, the first RACH transmission opportunity set is the RACH transmission opportunity set corresponding to the first SSB. Optionally, the maximum number D of SSBs in the cell is indicated by SIB1. Alternatively, the maximum number D of SSBs in a cell refers to the number of SSBs actually sent by the base station in one period.

In example A, the first set of RACH transmission opportunities corresponds to the first public information, and the M RACH transmission opportunities in the first set of RACH transmission opportunities also correspond to the first public information. Since the first public information corresponds to H pieces of second public information, in an optional manner, the M RACH transmission opportunities can be divided into H RACH transmission opportunity subsets, H RACH transmission opportunity subsets and H second public information The information is in one-to-one correspondence, and the first RACH transmission opportunity belongs to a RACH transmission opportunity subset corresponding to the third common information among the H RACH transmission opportunity subsets. The M RACH transmission opportunities may correspond to the H pieces of second public information in a predefined sequence. For example, the M RACH transmission opportunities correspond to the H pieces of second public information in an ascending order of the time domain, or correspond to the H pieces of second public information in an ascending order of the time domain. The M RACH transmission opportunities may also correspond to the H pieces of second public information in descending order of frequency domain resource indexes, or correspond to the H pieces of second public information in descending order of frequency domain resource indexes. How to divide the M RACH transmission opportunities into H RACH transmission opportunity subsets may refer to the manner in which the multiple RACH transmission opportunities configured by the base station are divided into multiple RACH transmission opportunity sets by the maximum number of SSBs in the cell.

For example, the first RACH transmission opportunity set corresponding to the first public information includes 8 RACH transmission opportunities, and the first public information corresponds to 4 second public information. The second public information is system information, the four second public information are system information 1 to system information 4 respectively, and the eight RACH transmission opportunities are four RACH transmission opportunity sets. The eight RACH transmission opportunities include RACH transmission opportunity 1 to RACH transmission opportunity 8, and the four pieces of system information are system information 1 to system information 4 respectively. RACH transmission opportunity 1 and RACH transmission opportunity 2 belong to RACH transmission opportunity set 1, corresponding to system information 1; RACH transmission opportunity 3 and RACH transmission opportunity 4 belong to RACH transmission opportunity set 2, corresponding to system information 2; RACH transmission opportunity set 5 and RACH transmission Opportunity set 6 belongs to RACH transmission opportunity set 3 and corresponds to system information 3; RACH transmission opportunity 7 and RACH transmission opportunity 8 belong to RACH transmission opportunity set 4 and corresponds to system information 4. Further, RACH transmission opportunity 1 to RACH transmission opportunity 8 may be arranged according to the time domain from small to large, that is, RACH transmission opportunity 1 is the earliest in the time domain, and RACH transmission opportunity 8 is the latest in the time domain. RACH transmission opportunity 1 to RACH transmission opportunity 8 may be arranged according to the index of time-frequency domain resources from small to large, that is, the frequency domain resource index of RACH transmission opportunity 1 is the smallest, and the frequency domain resource index of RACH transmission opportunity 8 is the largest.

Example B, the terminal sends the first RACH by using the first RACH transmission opportunity and the first preamble. The first RACH transmission opportunity corresponds to Q pieces of fourth public information, the Q pieces of fourth public information include the first public information, and Q is a positive integer. Optionally, the Q pieces of fourth public information may be understood as Q pieces of first public information with different indexes.

When Q is equal to 1, that is, the first RACH transmission opportunity corresponds to the first public information or the index corresponding to the first public information, when Q is greater than 1, the Q pieces of fourth public information include the first public information, that is, the first RACH The transmission opportunity corresponds to multiple pieces of fourth public information. Compared with the situation in Example A where one RACH transmission opportunity corresponds to one piece of public information, in Example B, one RACH transmission opportunity may correspond to multiple pieces of public information.

Based on the fact that the first RACH transmission opportunity corresponds to Q fourth public information, in an optional manner, the first RACH transmission opportunity corresponds to K preambles, and the K preambles are divided into Q preamble sets, and Q second information One-to-one correspondence with Q preamble sets, the first common information corresponds to the first preamble set, and the first preamble belongs to the first preamble set in the Q preamble sets, that is, the first preamble is Q A preamble set corresponding to the first public information in the preamble set.

Since the first public information corresponds to H pieces of second public information, in an optional manner, the first set of preambles can be further divided into H pieces of preamble subsets, and the H pieces of preamble subsets and H pieces of second public information are one One to one correspondence. Wherein, the first preamble belongs to the first preamble subset among the H preamble subsets, and the first preamble subset corresponds to the third common information. Optionally, the correspondence between the multiple preambles in the first preamble set and the H pieces of second public information can refer to the above-mentioned correspondence between the M RACH transmission opportunity sets and the H pieces of second public information. For the convenience of description, the first The preamble set includes L preambles as an example for introduction.

The L preambles correspond to the H pieces of second public information. For the correspondence between the L preambles and the H second public information, refer to the example in the above example A where E RACH transmission opportunities correspond to D SSBs.

For example, L is equal to 8, the L preambles can be sorted according to a predefined rule, the L preambles are respectively preamble 1 to preamble 8, and H is equal to 4. The second public information is system information, and the four pieces of system information are system information 1 to system information 4. The 8 preambles in the first preamble set are divided into 4 preamble subsets, and the 8 preambles are divided into preamble 1 to 4. Preamble 8. Preamble 1 and Preamble 2 belong to Preamble Subset 1; Preamble 3 and Preamble 4 belong to Preamble Subset 2; Preamble 5 and Preamble 6 belong to Preamble Subset 3; Preamble 7 and Preamble 8 belong to Preamble Subset 4. It should be understood that this application does not limit the starting number and ordering rules of the L preambles. For example, L is equal to 8, and the L preambles can also be numbered from 0. The L preambles are respectively preamble 0 to preamble 7.

In the above embodiment, the airspace configuration for the terminal to send the first RACH is the airspace configuration for the terminal to receive the third public information and the airspace configuration for receiving the first public information, and the airspace configuration corresponding to the smaller beam width, the narrower the beam, the terminal sends The energy of the first RACH is more concentrated, so as to improve the uplink coverage in the initial access stage. Correspondingly, the base station receives the airspace configuration of the first RACH, among the airspace configuration for sending the third public information and the airspace configuration for sending the first public information for the base station, corresponding to the airspace configuration with a smaller beam width, the narrower the beam, the RACH received by the base station The stronger the signal strength, the better the uplink coverage in the initial access phase.

In an optional manner, through the above steps S201 to S203, the terminal learns that the airspace configuration for sending the first RACH is the second airspace configuration, and the base station learns that the airspace configuration for receiving the first RACH is the fourth airspace configuration. Optionally, the terminal The base station and the base station can continue to complete the initial access through the air space configuration for transmitting the RACH determined in steps S201 to S203 respectively.

For example, the method shown in FIG. 2 may further include S204: the base station sends a first random access response (random access response, RAR) using the fourth airspace configuration, and correspondingly, the terminal receives the first RAR using the second airspace configuration.

Specifically, the terminal obtains the timing advance (timing advance, TA) of the initial uplink transmission through the first RAR, the temporary cell radio network temporary identifier ((temporary cell radio network temporary identifier, TC-RNTI) and the uplink grant (uplink grant), the The uplink grant is used to schedule subsequent physical uplink shared channel (physical uplink share channel, PUSCH) transmission.

In an optional manner, the method shown in FIG. 2 further includes S204: the terminal uses the second airspace configuration to send the PUSCH, the PUSCH is scheduled through the first RAR, or the time-frequency resources of the PUSCH or the MCS (modulation and At least one of coding scheme, modulation and coding scheme) is indicated by the first RAR.

Correspondingly, the base station receives the PUSCH through the fourth airspace configuration.

In an optional manner, the method shown in FIG. 2 further includes S205: the terminal detects downlink control information (downlink control information, DCI) scrambled by the TC-RNTI within the detection time window.

Specifically, if the terminal detects the TC-RNTI scrambled DCI within the detection time window, the terminal receives the PDSCH (physical downlink share channel, PDSCH) according to the TC-RNTI scrambled DCI. And feed back the result of whether the PDSCH is received successfully to the base station. Wherein, the terminal device detects the DCI scrambled by the TC-RNTI and receives the PDSCH through the second airspace configuration. Correspondingly, the base station sends the DCI scrambled by the TC-RNTI and sends the PDSCH through the fourth airspace configuration.

It can be understood that, in order to implement the functions in the foregoing embodiments, the base station and the terminal include hardware structures and/or software modules corresponding to each function. Those skilled in the art should easily realize that the present application can be implemented in the form of hardware or a combination of hardware and computer software with reference to the units and method steps of the examples described in the embodiments disclosed in the present application. Whether a certain function is executed by hardware or computer software drives the hardware depends on the specific application scenario and design constraints of the technical solution.

FIG. 6 and FIG. 7 are schematic structural diagrams of possible communication devices provided by the embodiments of the present application. These communication devices can be used to implement the functions of the terminal or the base station in the above method embodiments, and therefore can also realize the beneficial effects of the above method embodiments. In the embodiment of the present application, the communication device may be one of the terminals 120a-120j shown in FIG. 1, or the

base station

110a or 110b shown in FIG. 1, or a terminal or a base station Modules (such as chips).

As shown in FIG. 6 , the communication device 600 includes a transceiver unit 610 . The communication device 600 is configured to implement functions of a terminal or a base station in the method embodiment shown in FIG. 2 above.

When the communication device 600 is used to implement the functions of the terminal in the method embodiment shown in FIG. 2: the transceiver unit 610 is used to receive the first public information, receive the third public information, and send the first RACH. In an optional manner, the communication device 1300 further includes a processing unit 620 .

In an optional manner, the transceiver unit 610 is further configured to receive first indication information, where the first indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is a reference in the H pieces of second public information The time-frequency resource of the second public information.

When the communication device 600 is used to implement the functions of the base station in the method embodiment shown in FIG. 2: the transceiver unit 610 is used to send the first public information, send the third public information, and receive the first RACH; an optional method Among them, the communication device 600 processes the unit 620 .

In an optional manner, the transceiver unit 610 is further configured to send first indication information, where the first indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is a reference in the H pieces of second public information. The time-frequency resource of the second public information.

More detailed descriptions about the processing unit 620 and the transceiver unit 610 can be directly obtained by referring to the relevant descriptions in the method embodiment shown in FIG. 4 , and details are not repeated here.

As shown in FIG. 7 , a communication device 700 includes a processor 710 and an interface circuit 720 . The processor 710 and the interface circuit 720 are coupled to each other. It can be understood that the interface circuit 720 may be a transceiver or an input-output interface. Optionally, the communication device 700 may further include a memory 730 for storing instructions executed by the processor 710, or storing input data required by the processor 710 to execute the instructions, or storing data generated by the processor 710 after executing the instructions.

When the communication device 710 is used to implement the method shown in FIG. 2 , the processor 710 is used to implement the functions of the processing unit 620 , and the interface circuit 720 is used to implement the functions of the transceiver unit 610 .

When the above communication device is a chip applied to a terminal, the terminal chip implements the functions of the terminal in the above method embodiment. The terminal chip receives information from other modules in the terminal (such as radio frequency modules or antennas), and the information is sent to the terminal by the base station; or, the terminal chip sends information to other modules in the terminal (such as radio frequency modules or antennas), and the The information is sent by the terminal to the base station.

When the above communication device is a module applied to a base station, the base station module implements the functions of the base station in the above method embodiment. The base station module receives information from other modules in the base station (such as radio frequency modules or antennas), and the information is sent by the terminal to the base station; or, the base station module sends information to other modules in the base station (such as radio frequency modules or antennas), the The information is sent by the base station to the terminal. The base station module here may be a baseband chip of the base station, or a DU or other modules, and the DU here may be a DU under an open radio access network (O-RAN) architecture.

It can be understood that the processor in the embodiments of the present application can be a central processing unit (Central Processing Unit, CPU), and can also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application-specific integrated circuits (Application Specific Integrated Circuit, ASIC), Field Programmable Gate Array (Field Programmable Gate Array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor can be a microprocessor, or any conventional processor.

The method steps in the embodiments of the present application may be implemented in hardware, and may also be implemented in software instructions executable by a processor. Software instructions can be composed of corresponding software modules, and software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only Memory, registers, hard disk, removable hard disk, CD-ROM or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. A storage medium may also be an integral part of the processor. The processor and storage medium can be located in the ASIC. In addition, the ASIC can be located in the base station or the terminal. The processor and the storage medium may also exist in the base station or the terminal as discrete components.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer programs or instructions. When the computer program or instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, network equipment, user equipment, or other programmable devices. The computer program or instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions may be downloaded from a website, computer, A server or data center transmits to another website site, computer, server or data center by wired or wireless means. 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 integrating one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disk; or it may be a semiconductor medium, such as a solid state disk. The computer readable storage medium may be a volatile or a nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

In each embodiment of the present application, if there is no special explanation and logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referred to each other, and the technical features in different embodiments are based on their inherent Logical relationships can be combined to form new embodiments.

In this application, "at least one" means one or more, and "multiple" means two or more. "And/or" describes the corresponding relationship of corresponding objects, indicating that there may be three kinds of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural. In the text description of this application, the character "/" generally indicates that the corresponding objects before and after are a kind of "or" relationship; in the formula of this application, the character "/" indicates that the corresponding objects before and after are a kind of "division" Relationship. "Including at least one of A, B and C" may mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

It can be understood that the various numbers involved in the embodiments of the present application are only for convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the serial numbers of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its functions and internal logic.

Claims

A communication method, characterized in that the method comprises:

receiving first public information, where the first public information corresponds to H pieces of second public information;

receiving third public information, where the third public information belongs to the H pieces of second public information, where H is a positive integer greater than or equal to 2;

Sending the first random access channel RACH, one or more of the time-frequency resource, sequence, and airspace configuration for sending the first RACH are determined through the third public information.
The method of claim 1, further comprising:

receiving first indication information, where the first indication information is used to indicate a first time-frequency resource, where the first time-frequency resource is a time-frequency resource referring to the second public information among the H pieces of second public information.
The method according to claim 1 or 2, wherein the time-frequency resources of the H pieces of second public information are determined according to the first time-frequency resource of the reference second public information.
The method according to claim 2 or 3, wherein the time-frequency resource referring to the second public information is the time-frequency resource with the smallest frequency domain resource index among the H time-frequency resources of the second public information.
The method according to any one of claims 2-4, characterized in that, the time-frequency resources of the H pieces of second public information are continuous in the frequency domain, or, the adjacent two of the H pieces of second public information The time-frequency resources of the second public information are separated by Y resource blocks in the frequency domain, where Y is a positive integer.
The method according to any one of claims 2-5, wherein the first indication information is also used to indicate the H; or, the time-frequency resource of the downlink control channel PDCCH scheduling the third public information passes The first control resource set and/or the first search space are determined, and the H corresponds to the first control resource set and/or the first search space.
The method according to any one of claims 1-6, wherein the airspace configuration for sending the first RACH is the same as the airspace configuration for receiving the third public information.
The method according to any one of claims 1-7, wherein the sending the first random access channel RACH comprises: sending the first random access channel RACH through one or more RACH transmission opportunities in the first RACH transmission opportunity set One RACH, the first RACH transmission opportunity set is one of H RACH transmission opportunity sets, the H RACH transmission opportunity sets include M RACH transmission opportunities, N is a positive integer, and M is a positive number greater than or equal to N integer.
The method according to claim 8, wherein the first public information corresponds to the M RACH transmission opportunities, the H sets of RACH transmission opportunities correspond to the H second public information one by one, and the The first RACH transmission opportunity set is a RACH transmission opportunity set corresponding to the third public information in the H pieces of second public information.
The method according to any one of claims 1-7, wherein the sending the first random access channel RACH comprises: sending the first RACH through a first RACH transmission opportunity and a first preamble, the The first RACH transmission opportunity corresponds to Q pieces of fourth public information, and the Q pieces of fourth public information include the first public information, wherein the first RACH transmission opportunity corresponds to K preambles, and the K preambles The code belongs to Q preamble sets, the Q preamble sets correspond to the Q fourth public information one by one, and the first public information corresponds to the first preamble set in the Q preamble sets, The H pieces of second public information correspond one-to-one to the H preamble subsets in the first set of preambles, and the third public information in the H pieces of second public information corresponds to the H preamble subsets In the first preamble subset, the first preamble belongs to the first preamble subset.
The method according to any one of claims 1-10, wherein the first public information is received through a first beam, and the third public information is received through a second beam, and the width of the first beam is larger than the The width of the second beams, the coverage of the H second beams is greater than or equal to the coverage of the first beams.
A communication method, characterized in that the method comprises:

sending first public information, where the first public information corresponds to H pieces of second public information;

sending third public information, where the third public information belongs to the H pieces of second public information, where H is a positive integer greater than or equal to 2;

The first random access information RACH is received, and one or more items of the time-frequency resource, sequence, and airspace configuration for receiving the first RACH are determined through the third public information.
The method of claim 12, further comprising:

Sending first indication information, where the first indication information is used to indicate a first time-frequency resource, where the first time-frequency resource is a time-frequency resource referring to the second public information among the H pieces of second public information.
The method according to claim 13, wherein the time-frequency resources of the H pieces of second public information are determined according to the first time-frequency resource of the reference second public information.
The method according to claim 13 or 14, wherein the time-frequency resource referring to the second public information is the time-frequency resource with the smallest frequency-domain resource index among the time-frequency resources of the H second public information .
The method according to any one of claims 13-15, characterized in that, the time-frequency resources of the H pieces of second public information are continuous in the frequency domain, or the adjacent time-frequency resources of the H pieces of second public information The time-frequency resources of the two second public information are separated by Y resource blocks in the frequency domain, where Y is a positive integer.
The method according to any one of claims 13-16, wherein the first indication information is also used to indicate the H; or, the time-frequency resource of the downlink control channel PDCCH scheduling the third public information passes The first control resource set and/or the first search space are determined, and the H corresponds to the first control resource set and/or the first search space.
The method according to any one of claims 12-17, wherein the airspace configuration for sending the first RACH is the same as the airspace configuration for receiving the third public information.
The method according to any one of claims 12-18, wherein the receiving the first random access channel RACH comprises:

Send the first RACH through one or more RACH transmission opportunities in the first RACH transmission opportunity set, the first RACH transmission opportunity set is one of the H RACH transmission opportunity sets, and the H RACH transmission opportunity sets It includes M RACH transmission opportunities, N is a positive integer, and M is a positive integer greater than or equal to N.
The method according to claim 19, wherein the first public information corresponds to the M RACH transmission opportunities, and the H sets of RACH transmission opportunities are in one-to-one correspondence with the H second public information, so The first set of RACH transmission opportunities is a set of RACH transmission opportunities corresponding to the third public information in the H pieces of second public information.
The method according to any one of claims 12-18, wherein the receiving the first random access channel RACH comprises:

sending the first RACH by using a first RACH transmission opportunity and a first preamble, where the first RACH transmission opportunity corresponds to Q pieces of fourth public information, and the Q pieces of fourth public information include the first public information, Wherein, the first RACH transmission opportunity corresponds to K preambles, and the K preambles belong to Q preamble sets, and the Q preamble sets correspond to the Q fourth public information one by one, and the The first public information corresponds to the first preamble set in the Q preamble sets, the H second public information corresponds to the H preamble subsets in the first preamble set one by one, and the H The third public information in the second public information corresponds to a first preamble subset in the H preamble subsets, and the first preamble belongs to the first preamble subset.
The method according to any one of claims 12-21, wherein the first public information is sent through a third beam, and the third public information is sent through a fourth beam, and the width of the third beam is larger than the The width of the fourth beam, the coverage of the H fourth beams is greater than or equal to the coverage of the third beam.
A communication device, characterized in that it includes a transceiver unit, the transceiver unit is used for:

receiving first public information, where the first public information corresponds to H pieces of second public information;

receiving third public information, where the third public information belongs to the H pieces of second public information, where H is a positive integer greater than or equal to 2;

Sending the first random access channel RACH, one or more of the time-frequency resource, sequence, and airspace configuration for sending the first RACH are determined through the third public information.
The device according to claim 23, wherein the transceiver unit is also used for:

receiving first indication information, where the first indication information is used to indicate a first time-frequency resource, where the first time-frequency resource is a time-frequency resource referring to the second public information among the H pieces of second public information.
The device according to claim 23 or 24, wherein the time-frequency resources of the H pieces of second public information are determined according to the first time-frequency resource of the reference second public information.
The device according to claim 24 or 25, wherein the time-frequency resource referring to the second public information is the time-frequency resource with the smallest frequency domain resource index among the time-frequency resources of the H second public information .
The device according to any one of claims 24-26, wherein the time-frequency resources of the H pieces of second public information are continuous in the frequency domain, or, the adjacent time-frequency resources of the H pieces of second public information The time-frequency resources of the two second public information are separated by Y resource blocks in the frequency domain, where Y is a positive integer.
The device according to any one of claims 24-27, wherein the first indication information is also used to indicate the H; or, the time-frequency resource of the PDCCH for scheduling the third common information is passed through the first The control resource set and/or the first search space are determined, and the H corresponds to the first control resource set and/or the first search space.
The device according to any one of claims 23-28, wherein the airspace configuration for sending the first RACH is the same as the airspace configuration for receiving the third public information.
The device according to any one of claims 23-29, wherein the sending the first random access channel RACH includes:

Send the first RACH through one or more RACH transmission opportunities in the first RACH transmission opportunity set, the first RACH transmission opportunity set is one of the H RACH transmission opportunity sets, and the H RACH transmission opportunity sets It includes M RACH transmission opportunities, N is a positive integer, and M is a positive integer greater than or equal to N.
The device according to claim 30, wherein the first public information corresponds to the M RACH transmission opportunities, and the H RACH transmission opportunity sets are in one-to-one correspondence with the H second public information, so The first set of RACH transmission opportunities is a set of RACH transmission opportunities corresponding to the third public information in the H pieces of second public information.
The device according to any one of claims 23-29, wherein the sending the first random access channel RACH includes:

sending the first RACH by using a first RACH transmission opportunity and a first preamble, where the first RACH transmission opportunity corresponds to Q pieces of fourth public information, and the Q pieces of fourth public information include the first public information, Wherein, the first RACH transmission opportunity corresponds to K preambles, and the K preambles belong to Q preamble sets, and the Q preamble sets correspond to the Q fourth public information one by one, and the The first public information corresponds to the first preamble set in the Q preamble sets, the H second public information corresponds to the H preamble subsets in the first preamble set one by one, and the H The third public information in the second public information corresponds to a first preamble subset in the H preamble subsets, and the first preamble belongs to the first preamble subset.
The device according to any one of claims 23-32, wherein the transceiver unit receives the first public information through a first beam, and the transceiver unit receives the third public information through a second beam, The width of the first beam is greater than the width of the second beam, and the coverage of the H second beams is greater than or equal to the coverage of the first beam.
A communication device, characterized in that it includes a transceiver unit, the transceiver unit is used for:

sending first public information, where the first public information corresponds to H pieces of second public information;

sending third public information, where the third public information belongs to the H pieces of second public information, where H is a positive integer greater than or equal to 2;

The first random access information RACH is received, and one or more items of the time-frequency resource, sequence, and airspace configuration for receiving the first RACH are determined through the third public information.
The device according to claim 34, wherein the transceiver unit is also used for:

Sending first indication information, where the first indication information is used to indicate a first time-frequency resource, where the first time-frequency resource is a time-frequency resource referring to the second public information among the H pieces of second public information.
The device according to claim 35, wherein the time-frequency resources of the H pieces of second public information are determined according to the first time-frequency resource of the reference second public information.
The device according to claim 35 or 36, wherein the time-frequency resource referring to the second public information is the time-frequency resource with the smallest frequency-domain resource index among the time-frequency resources of the H second public information .
The device according to any one of claims 35-37, wherein the time-frequency resources of the H pieces of second public information are continuous in the frequency domain, or, the adjacent time-frequency resources of the H pieces of second public information The time-frequency resources of the two second public information are separated by Y resource blocks in the frequency domain, where Y is a positive integer.
The device according to any one of claims 35-38, wherein the first indication information is also used to indicate the H; or, scheduling the time-frequency resource of the downlink control channel PDCCH of the third public information Determined by the first set of control resources and/or the first search space, the H corresponds to the first set of control resources and/or the first search space.
The device according to any one of claims 34-39, wherein the airspace configuration for sending the first RACH is the same as the airspace configuration for receiving the third public information.
The device according to any one of claims 34-40, wherein the receiving the first random access channel RACH comprises:

Send the first RACH through one or more RACH transmission opportunities in the first RACH transmission opportunity set, the first RACH transmission opportunity set is one of the H RACH transmission opportunity sets, and the H RACH transmission opportunity sets It includes M RACH transmission opportunities, N is a positive integer, and M is a positive integer greater than or equal to N.
The device according to claim 41, wherein the first public information corresponds to the M RACH transmission opportunities, and the H sets of RACH transmission opportunities are in one-to-one correspondence with the H second public information, The first set of RACH transmission opportunities is a set of RACH transmission opportunities corresponding to the third public information in the H pieces of second public information.
The device according to any one of claims 34-40, wherein the receiving the first random access channel RACH comprises:

sending the first RACH by using a first RACH transmission opportunity and a first preamble, where the first RACH transmission opportunity corresponds to Q pieces of fourth public information, and the Q pieces of fourth public information include the first public information, Wherein, the first RACH transmission opportunity corresponds to K preambles, and the K preambles belong to Q preamble sets, and the Q preamble sets correspond to the Q fourth public information one by one, and the The first public information corresponds to the first preamble set in the Q preamble sets, the H second public information corresponds to the H preamble subsets in the first preamble set one by one, and the H The third public information in the second public information corresponds to a first preamble subset in the H preamble subsets, and the first preamble belongs to the first preamble subset.
The device according to any one of claims 12-21, wherein the transceiver unit sends the first public information through a third beam, and the transceiver unit sends the third public information through a fourth beam, The width of the third beam is greater than the width of the fourth beam, and the coverage of the H fourth beams is greater than or equal to the coverage of the third beam.
A communication device, characterized in that it includes a processor and an interface circuit, the interface circuit is used to receive signals from other communication devices other than the communication device and transmit them to the processor, or transmit signals from the processing The signal of the processor is sent to other communication devices other than the communication device, and the processor is used to implement the method according to any one of claims 1-11 through a logic circuit or to execute code instructions, or to implement The method according to any one of claims 12-22.
A computer-readable storage medium, characterized in that instructions are stored in the storage medium, and when the instructions are executed by the communication device, the method according to any one of claims 1-11 is realized, or the method according to any one of claims 1-11 is realized, or The method according to any one of claims 12-22.
A computer program product, characterized in that, when it is run on a computer, it causes the computer to execute the method according to any one of claims 1-11, or to execute the method according to any one of claims 12-22. described method.