CN112929978B

CN112929978B - Preamble transmission method and apparatus, and computer-readable storage medium

Info

Publication number: CN112929978B
Application number: CN202110298340.7A
Authority: CN
Inventors: 胡炜
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2021-03-19
Filing date: 2021-03-19
Publication date: 2022-08-19
Anticipated expiration: 2041-03-19
Also published as: WO2022193972A1; CN112929978A

Abstract

A preamble sending method and device, and a computer readable storage medium, the method comprising: selecting a preferred SSB according to the channel quality, and determining a preferred RO position corresponding to the preferred SSB according to a preset mapping relation between the SSB and the candidate RO position; judging whether the PRACH time slot of the preferred RO position contains enough uplink symbols or not; if the judgment result shows that the uplink symbols contained in the PRACH time slot are insufficient, selecting alternative RO positions in other PRACH time slots according to the channel quality, wherein the other PRACH time slots contain the candidate RO positions and enough uplink symbols; transmitting the preamble at the alternate RO location. The scheme of the invention can increase the successful access opportunity when the random access process is carried out.

Description

Preamble transmission method and apparatus, and computer-readable storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a preamble transmission method and apparatus, and a computer-readable storage medium.

Background

According to The related provisions of The existing protocol, when a User Equipment (UE) initiates Random Access in The Fifth-Generation mobile communication technology (5G), all Random Access (RO) locations that can be used for sending a Random Access preamble (preamble) are configured by a network through a system message. But which RO locations are finally available for sending the preamble depends on the determination of the current strongest Synchronization Signal Block (SS/PBCH Block, i.e., SSB) index (SSB index) and the mapping relationship between the SSB and RO locations of the network configuration.

In a 5G New Radio (NR, which may also be referred to as New Radio) environment, due to time fluctuation of a network signal, a strongest SSB index may also change, thereby affecting selection of a location of an RO that is finally used by the UE.

When the slot (slot) of the finally selected RO location does not have enough uplink symbols (symbols) for sending the preamble, the UE cannot always initiate access because of no uplink resource, and the successful access opportunity is seriously reduced.

Disclosure of Invention

The invention solves the technical problem of how to increase the successful access chance in random access.

In order to solve the foregoing technical problem, an embodiment of the present invention provides a preamble sending method, including: selecting a preferred SSB according to the channel quality, and determining a preferred RO position corresponding to the preferred SSB according to a preset mapping relation between the SSB and the candidate RO position; judging whether the PRACH time slot of the preferred RO position contains enough uplink symbols or not; if the judgment result shows that the uplink symbols contained in the PRACH time slot are insufficient, selecting alternative RO positions in other PRACH time slots according to the channel quality, wherein the other PRACH time slots contain the candidate RO positions and enough uplink symbols; transmitting the preamble at the alternate RO location.

Optionally, the determining whether the PRACH slot in which the preferred RO location is located includes enough uplink symbols includes: and judging whether uplink symbols contained in the PRACH time slot of the preferred RO position can bear all contents of the preamble or not.

Optionally, the selecting, at another PRACH time slot, a substitute RO location according to the channel quality includes: determining candidate SSBs corresponding to the candidate RO positions contained in the other PRACH time slots according to a preset mapping relation between the SSBs and the candidate RO positions; determining candidate SSBs with channel quality higher than a preset threshold as substitute SSBs; and determining a substitute RO position corresponding to the substitute SSB according to a preset mapping relation between the SSB and the candidate RO position.

Optionally, the determining, according to the preset mapping relationship between the SSB and the candidate RO location, the alternative RO location corresponding to the alternative SSB includes: and when the preset mapping relation between the SSB and the candidate RO positions shows that the substitute SSB corresponds to a plurality of candidate RO positions, randomly selecting the substitute RO positions from the corresponding candidate RO positions.

Optionally, the preset threshold is determined according to a path loss, RSRP, and a signal-to-noise ratio of the PRACH, where different parameters correspond to different weight coefficients.

Optionally, the preset mapping relationship between the SSB and the candidate RO location is determined based on a network configuration.

Optionally, the channel quality is determined according to a measurement result of the SSB bitmap.

An embodiment of the present invention further provides a preamble sending apparatus, including: the first selection module is used for selecting a preferred SSB according to the channel quality and determining a preferred RO position corresponding to the preferred SSB according to a preset mapping relation between the SSB and the candidate RO position; a judging module, configured to judge whether a PRACH time slot in which the preferred RO location is located includes enough uplink symbols; a second selection module, configured to select a substitute RO location in another PRACH time slot according to channel quality if the determination result indicates that the PRACH time slot includes insufficient uplink symbols, where the another PRACH time slot includes the candidate RO location and includes sufficient uplink symbols; a transmitting module for transmitting the preamble at the alternate RO location.

An embodiment of the present invention further provides a computer-readable storage medium, which is a non-volatile storage medium or a non-transitory storage medium, and on which a computer program is stored, where the computer program is executed by a processor to perform the steps of the above method.

The embodiment of the present invention further provides a preamble transmission apparatus, which includes a memory and a processor, where the memory stores a computer program that can be executed on the processor, and the processor executes the steps of the method when executing the computer program.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

the embodiment of the invention provides a lead code sending method, which comprises the following steps: selecting a preferred SSB according to the channel quality, and determining a preferred RO position corresponding to the preferred SSB according to a preset mapping relation between the SSB and the candidate RO position; judging whether the PRACH time slot in which the preferred RO position is positioned contains enough uplink symbols or not; if the judgment result shows that the uplink symbols contained in the PRACH time slot are insufficient, selecting alternative RO positions in other PRACH time slots according to the channel quality, wherein the other PRACH time slots contain the candidate RO positions and enough uplink symbols; transmitting the preamble at the alternate RO location.

Compared with the prior art that the RO position for sending the preamble code is determined according to the mapping relationship between the RO position and the SSB strictly configured by the network and the currently measured strongest SSB index, when the PRACH time slot where the preferred RO position corresponding to the strongest SSB index (i.e. the preferred SSB) is located does not have enough uplink symbols to send the preamble code, the UE can not initiate the random access all the time. The scheme of the application can increase the successful access opportunity when the random access process is carried out. Specifically, when the situation occurs, the scheme of the application increases the successful access opportunity of the UE in the situation by inquiring whether other PRACH slots can meet the preamble transmission requirement and temporarily ignoring the mapping relationship between the SSB and the RO location. Ignoring the mapping relationship between SSBs and RO locations for the moment may be understood as discarding the preferred RO location corresponding to the preferred SSB, and finding the alternative RO location where the PRACH slot includes enough uplink symbols.

Further, determining candidate SSBs corresponding to the candidate RO positions included in the other PRACH time slots according to a preset mapping relation between the SSBs and the candidate RO positions; determining candidate SSBs with channel quality higher than a preset threshold as substitute SSBs; and determining a substitute RO position corresponding to the substitute SSB according to a preset mapping relation between the SSB and the candidate RO position. In the scheme of the invention, the channel quality of the SSB corresponding to the alternative RO location is higher than a preset threshold, so that the preamble sent at the alternative RO location can be successfully transmitted to the base station.

Drawings

Fig. 1 is a flowchart of a preamble transmission method according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a preamble transmission apparatus according to an embodiment of the present invention.

Detailed Description

As mentioned in the background art, the actual location of the RO used for preamble transmission may vary with the finally selected SSB index, and the uplink and downlink slot configuration of the NR is flexible. When the Physical Random Access Channel (PRACH) timeslot where the RO position corresponding to the changed SSB index is located does not have enough uplink symbols, for example, the selected RO position is just in a special timeslot in a Data Distribution Service (DDS) configuration of 2 milliseconds (ms), the UE may not send a preamble and finally trigger an Access timeout alarm.

Specifically, when the UE of the prior art transmits the preamble for initiating the random access, all RO locations (i.e., candidate RO locations) that can be used for transmitting the preamble, including the time domain location and the frequency domain location, are determined according to the network configuration parameters. Then, the UE will measure according to the SSB bitmap (bitmap) sent by the network, and see which SSB indexes can be detected. Then, an SSB index meeting the threshold requirement is found among the detected SSBs as the preferred SSB for transmitting the preamble. Since the cell already specifies the mapping relationship between each SSB and the candidate RO location in the access rule, when the UE selects the preferred SSB, it is equivalent to defining the RO location that can be used for transmission. That is, the UE in the prior art can only send the preamble at the RO location corresponding to the optimal SSB, and the fault tolerance rate is low in a scenario where the uplink and downlink timeslot configuration is very flexible, such as NR, and the successful access opportunity is severely reduced.

The scheme of the application can increase the successful access opportunity when the random access process is carried out. Specifically, when the situation occurs, the scheme of the application increases the successful access opportunity of the UE in the situation by inquiring whether other PRACH slots can meet the preamble transmission requirement and temporarily ignoring the mapping relationship between the SSB and the RO location. Ignoring the mapping relationship between the SSB and the RO location for the moment may be understood as discarding the preferred RO location corresponding to the preferred SSB, and instead finding a substitute RO location where the PRACH slot includes enough uplink symbols.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below.

Fig. 1 is a flowchart of a preamble transmission method according to an embodiment of the present invention.

This embodiment may be performed by the user equipment side, such as by a UE of the user equipment side.

The embodiment can be applied to a random access scene, such as a random access scene adopting an NR technology.

In a specific implementation, the preamble method provided in steps S101 to S104 may be executed by a chip with a random access function in the user equipment, or may be executed by a baseband chip in the user equipment.

Specifically, referring to fig. 1, the preamble transmission method according to this embodiment may include the following steps:

step S101, selecting a preferred SSB according to the channel quality, and determining a preferred RO position corresponding to the preferred SSB according to a preset mapping relation between the SSB and the candidate RO position;

step S102, judging whether the PRACH time slot in which the preferred RO position is positioned contains enough uplink symbols;

if the determination result in the step S102 is negative, that is, the PRACH time slot includes insufficient uplink symbols, step S103 is executed, that is, a substitute RO location is selected according to channel quality in another PRACH time slot, where the another PRACH time slot includes the candidate RO location and includes sufficient uplink symbols.

Further, after performing step S103, step S104 is also performed, namely, the preamble is transmitted at the alternative RO location.

If the determination result in step S102 is yes, that is, the PRACH slot includes enough uplink symbols, step S105 is executed, that is, the preamble is sent at the preferred RO location.

In a specific implementation, the preamble sending process in this embodiment may be triggered and executed after a Physical (PHY) layer of the UE receives the random access request.

Further, before step S101, the method may further include the step of: all available RO locations, i.e. candidate RO locations, are obtained. Such as determining all candidate RO locations based on network configuration parameters.

In one implementation, the channel quality may be determined based on measurements of an SSB bitmap (bitmap).

Further, in step S101, the SSB with the strongest channel quality among all the measured SSBs may be determined as the preferred SSB.

Further, the channel quality of the preferred SSB is higher than a preset threshold. The preset threshold may be determined according to a path loss of the PRACH, a Reference Signal Received Power (RSRP for short), and a Signal-to-noise ratio. In a specific implementation, the three parameters may respectively correspond to different weight coefficients, and the preset threshold is obtained by weighting according to the respective weight coefficients. The specific value of each weight coefficient can be determined comprehensively according to the decoding easiness.

In one implementation, the predetermined mapping relationship between the SSB and the candidate RO location may be determined based on a network configuration. For example, the preset mapping relationship may be used to indicate a correspondence relationship between SSB indexes and candidate RO locations.

Further, the SSB index and the candidate RO location may be in a one-to-one correspondence, or may be in a many-to-one or one-to-many mapping relationship.

When the preset mapping relationship indicates that the preferred SSB corresponds to multiple candidate RO locations, one candidate RO location may be randomly selected as the preferred RO location.

In one implementation, the step S102 may include the steps of: and judging whether the uplink symbols contained in the PRACH time slot of the preferred RO position can bear the whole content of the preamble or not.

If the uplink symbol included in the PRACH slot in which the preferred RO location is located is not enough to transmit the preamble, step S103 and step S104 are performed.

Based on the present embodiment, when the preferred RO location selected according to the strongest SSB index does not have enough uplink symbols for transmitting the preamble, as long as there are other PRACH slots in the current cell and the slot has enough uplink symbols for transmitting the preamble. The preamble is directly transmitted with the RO location on the other PRACH slot to increase the chance of successful access.

That is to say, after detecting that all selected ROs have insufficient symbols (symbol) for transmission, as long as other PRACH time slots satisfying the transmission condition are found, the original RO selection mechanism is ignored, and access is initiated on other PRACH time slots allowed by the network, so as to improve access opportunities.

In one implementation, the other PRACH slots may refer to other PRACH slots including the candidate RO location in addition to the PRACH slot in which the preferred RO location is located.

In one implementation, the candidate RO location and the preferred RO location included in other PRACH slots may correspond to the same SSB, i.e., both correspond to the preferred SSB selected in step S101.

For example, assuming the protocol specifies that preambles can be sent in both slot 18 and slot 19, then both slot 18 and slot 19 have candidate RO positions, all of which correspond to the same SSB, and the UE currently detects only this one SSB. It is assumed that a certain candidate RO location in the selected slot 18 at step S101 is the preferred RO location to transmit the preamble. If the judgment result of step S102 indicates that the uplink symbol of the slot 18 is not enough to transmit the preamble, all the candidate RO positions in the slot 18 are discarded, and the UE uses the candidate RO position in the slot 19 as the substitute RO position to transmit the preamble.

In one variation, the candidate RO locations and the preferred RO location contained by other PRACH slots may correspond to different SSBs.

In this embodiment, a suitable alternative RO location may be selected according to the channel quality of the SSB corresponding to the candidate RO location included in the other PRACH slot, so as to further increase the successful access.

In one implementation, step S103 may include the steps of: determining candidate SSBs corresponding to the candidate RO positions contained in the other PRACH time slots according to a preset mapping relation between the SSBs and the candidate RO positions; determining candidate SSBs with channel quality higher than a preset threshold as alternative SSBs; and determining a substitute RO position corresponding to the substitute SSB according to a preset mapping relation between the SSB and the candidate RO position.

Therefore, the channel quality of the SSB corresponding to the alternative RO location is higher than the preset threshold, so that the preamble transmitted at the alternative RO location can be successfully transmitted to the base station.

Further, when there are a plurality of candidate SSBs having channel quality higher than a preset threshold, the candidate SSB having the best channel quality among the candidate SSBs may be determined as the substitute SSB.

Further, when the preset mapping relationship between the SSB and the candidate RO location indicates that the alternative SSB corresponds to multiple candidate RO locations, the alternative RO location may be randomly selected from the multiple candidate RO locations.

In a specific implementation, if there are no suitable other PRACH slots, or channel qualities of SSBs corresponding to candidate RO locations included in the other PRACH slots are all lower than a preset threshold, an alarm message is sent to prompt that a preamble cannot be sent.

Further, the action of sending the alarm information may be performed when the access is not timed out, so as to improve the response efficiency of the UE.

Thus, by adopting the embodiment, the successful access opportunity can be increased when the random access process is carried out. Specifically, when the situation occurs, the scheme of the application increases the successful access opportunity of the UE in the situation by inquiring whether other PRACH slots can meet the preamble transmission requirement and temporarily ignoring the mapping relationship between the SSB and the RO location. Ignoring the mapping relationship between SSBs and RO locations for the moment may be understood as discarding the preferred RO location corresponding to the preferred SSB, and finding the alternative RO location where the PRACH slot includes enough uplink symbols.

Fig. 2 is a schematic structural diagram of a preamble transmission apparatus according to an embodiment of the present invention. Those skilled in the art understand that the preamble transmission apparatus in this embodiment can be used to implement the method technical solution described in the embodiment of fig. 1.

Specifically, referring to fig. 2, the preamble transmission apparatus 2 according to this embodiment may include: a first selection module 21, configured to select a preferred SSB according to channel quality, and determine a preferred RO location corresponding to the preferred SSB according to a preset mapping relationship between the SSB and a candidate RO location; a determining module 22, configured to determine whether the PRACH time slot in which the preferred RO location is located includes enough uplink symbols; a second selection module 23, configured to select, according to channel quality, a substitute RO location in another PRACH slot if the determination result indicates that the PRACH slot includes insufficient uplink symbols, where the another PRACH slot includes the candidate RO location and includes sufficient uplink symbols; a sending module 24, configured to send the preamble at the alternative RO location.

For more contents of the operation principle and the operation manner of the preamble transmission device 2, reference may be made to the related description in fig. 1, and details are not repeated here.

In a specific implementation, the preamble sending apparatus may correspond to a Chip having a random access function in the user equipment, or correspond to a Chip having a data processing function, such as a System-On-a-Chip (SOC), a baseband Chip, or the like; or the chip module group comprises a chip with a random access function in the corresponding user equipment; or to a chip module having a chip with data processing function, or to a user equipment.

In specific implementation, regarding each module/unit included in each apparatus and product described in the foregoing embodiments, it may be a software module/unit, or may also be a hardware module/unit, or may also be a part of the software module/unit and a part of the hardware module/unit.

For example, for each apparatus and product applied to or integrated into a chip, each module/unit included in the apparatus and product may all be implemented by hardware such as a circuit, or at least a part of the modules/units may be implemented by a software program running on a processor integrated within the chip, and the remaining (if any) part of the modules/units may be implemented by hardware such as a circuit; for each device or product applied to or integrated with the chip module, each module/unit included in the device or product may be implemented by using hardware such as a circuit, and different modules/units may be located in the same component (e.g., a chip, a circuit module, etc.) or different components of the chip module, or at least some of the modules/units may be implemented by using a software program running on a processor integrated within the chip module, and the rest (if any) of the modules/units may be implemented by using hardware such as a circuit; for each device and product applied to or integrated in the terminal, each module/unit included in the device and product may be implemented by using hardware such as a circuit, and different modules/units may be located in the same component (e.g., a chip, a circuit module, etc.) or different components in the terminal, or at least part of the modules/units may be implemented by using a software program running on a processor integrated in the terminal, and the rest (if any) part of the modules/units may be implemented by using hardware such as a circuit.

An embodiment of the present invention further provides a computer-readable storage medium, which is a non-volatile storage medium or a non-transitory storage medium, and on which a computer program is stored, where the computer program is executed by a processor to perform the steps of the preamble transmission method provided in any of the above embodiments. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transient) memory. The storage medium may include ROM, RAM, magnetic or optical disks, etc.

The embodiment of the present invention further provides another preamble transmission apparatus, which includes a memory and a processor, where the memory stores a computer program that can be executed on the processor, and the processor executes the steps of the preamble transmission method provided in the embodiment corresponding to fig. 1 when executing the computer program.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by instructing the relevant hardware through a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.

The technical scheme of the invention can be suitable for 5G (5generation) communication systems, 4G and 3G communication systems, and various communication systems of subsequent evolution, such as 6G, 7G and the like.

The technical solution of the present invention is also applicable to different network architectures, including but not limited to relay network architecture, dual link architecture, and Vehicle-to-event architecture.

The 5G CN in the embodiment of the present application may also be referred to as a new core (new core), a 5G new core, a Next Generation Core (NGC), or the like. The 5G-CN is set independently of an existing core network, such as an Evolved Packet Core (EPC).

A Base Station (BS) in the embodiment of the present application, which may also be referred to as a base station device, is a device deployed in a radio access network to provide a wireless communication function. For example, the device providing the base station function in the 2G network includes a Base Transceiver Station (BTS) and a Base Station Controller (BSC), the device providing the base station function in the 3G network includes a node B (NodeB) and a Radio Network Controller (RNC), the device providing the base station function in the 4G network includes an evolved node B (eNB), the device providing the base station function in the Wireless Local Area Network (WLAN) is an Access Point (AP), the device providing the base station function in the 5G New Radio (New Radio, NR) includes a node B (gnb) that continues to evolve, and the device providing the base station function in a New communication system in the future, and the like.

A terminal in the embodiments of the present application may refer to various forms of User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a Mobile Station (MS), a remote station, a remote terminal, a mobile device, a user terminal, a terminal device (terminal equipment), a wireless communication device, a user agent, or a user equipment. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication function, a computing device or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G Network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which are not limited in this embodiment.

In the embodiment of the application, a unidirectional communication link from an access network to a terminal is defined as a downlink, data transmitted on the downlink is downlink data, and the transmission direction of the downlink data is called as a downlink direction; the unidirectional communication link from the terminal to the access network is an uplink, the data transmitted on the uplink is uplink data, and the transmission direction of the uplink data is referred to as an uplink direction.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein indicates that the former and latter associated objects are in an "or" relationship.

The "plurality" appearing in the embodiments of the present application means two or more.

The descriptions of the first, second, etc. appearing in the embodiments of the present application are only for the purpose of illustrating and differentiating the description objects, and do not represent any particular limitation to the number of devices in the embodiments of the present application, and cannot constitute any limitation to the embodiments of the present application.

The term "connect" in the embodiments of the present application refers to various connection manners, such as direct connection or indirect connection, to implement communication between devices, which is not limited in this embodiment of the present application. In the embodiments of the present application, "network" and "system" represent the same concept, and a communication system is a communication network.

It should be understood that, in the embodiment of the present application, the processor may be a Central Processing Unit (CPU), and the processor may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It will also be appreciated that the memory in the embodiments of the subject application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of Random Access Memory (RAM) are available, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct bus RAM (DR RAM).

The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, the above-described embodiments 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 instructions or computer programs. The procedures or functions described in accordance with the embodiments of the present application are produced in whole or in part when the computer instructions or the computer program are loaded or executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more collections of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed method, apparatus and system may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately and physically included, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer-readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a portable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other media capable of storing program codes.

Claims

1. A preamble transmission method, comprising:

selecting a preferred SSB according to the channel quality, and determining a preferred RO position corresponding to the preferred SSB according to a preset mapping relation between the SSB and the candidate RO position;

judging whether the PRACH time slot in which the preferred RO position is positioned contains enough uplink symbols or not;

if the judgment result shows that the uplink symbols contained in the PRACH time slot are insufficient, selecting alternative RO positions in other PRACH time slots according to the channel quality, wherein the other PRACH time slots contain the candidate RO positions and enough uplink symbols;

transmitting the preamble at the alternate RO location.

2. The preamble sending method of claim 1, wherein the determining whether the PRACH slot in which the preferred RO location is located includes enough uplink symbols comprises:

and judging whether the uplink symbols contained in the PRACH time slot of the preferred RO position can bear the whole content of the preamble or not.

3. The preamble transmission method of claim 1, wherein the selecting alternative RO locations based on channel quality at other PRACH slots comprises:

determining candidate SSBs corresponding to the candidate RO positions contained in the other PRACH time slots according to a preset mapping relation between the SSBs and the candidate RO positions;

determining candidate SSBs with channel quality higher than a preset threshold as substitute SSBs;

and determining a substitute RO position corresponding to the substitute SSB according to a preset mapping relation between the SSB and the candidate RO position.

4. The preamble sending method of claim 3, wherein the determining the alternative RO location corresponding to the alternative SSB according to the preset mapping relationship between the SSB and the candidate RO location comprises: and when the preset mapping relation between the SSB and the candidate RO positions indicates that the alternative SSB corresponds to a plurality of candidate RO positions, randomly selecting the alternative RO positions from the corresponding candidate RO positions.

5. The preamble sending method according to claim 3, wherein the preset threshold is determined according to a path loss, RSRP and a signal-to-noise ratio of the PRACH, and wherein different parameters correspond to different weight coefficients.

6. The preamble sending method of claim 1, wherein the preset mapping relationship between the SSB and the candidate RO location is determined based on a network configuration.

7. The preamble transmission method according to claim 1, wherein the channel quality is determined according to a measurement result of an SSB bitmap.

8. A preamble transmission apparatus, comprising:

the first selection module is used for selecting a preferred SSB according to the channel quality and determining a preferred RO position corresponding to the preferred SSB according to a preset mapping relation between the SSB and the candidate RO position;

a judging module, configured to judge whether a PRACH time slot in which the preferred RO location is located includes enough uplink symbols;

a second selection module, configured to select a substitute RO location in another PRACH slot according to channel quality if the determination result indicates that the PRACH slot includes insufficient uplink symbols, where the another PRACH slot includes the candidate RO location and includes sufficient uplink symbols;

a transmitting module for transmitting the preamble at the alternate RO location.

9. A computer-readable storage medium, being a non-volatile storage medium or a non-transitory storage medium, having a computer program stored thereon, the computer program, when being executed by a processor, performing the steps of the method according to any one of claims 1 to 7.

10. A preamble transmission device comprising a memory and a processor, said memory having stored thereon a computer program being executable on said processor, characterized in that said processor is operative to perform the steps of the method as claimed in any one of the claims 1 to 7 when executing said computer program.