CN114071772B

CN114071772B - Physical random access channel PRACH resource allocation method and device

Info

Publication number: CN114071772B
Application number: CN202010763583.9A
Authority: CN
Inventors: 任智勇
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2023-07-18
Anticipated expiration: 2040-07-31
Also published as: CN114071772A

Abstract

The embodiment of the invention provides a physical random access channel PRACH resource allocation method and device. The method comprises the steps of obtaining target SSB which accords with a preset condition in a plurality of synchronous signals SSB of a target cell, wherein the preset condition comprises that the number of user equipment which are switched to the same cell through the same SSB in a preset time period is larger than a first preset threshold; selecting target resources reserved for the target SSB from a preset resource set, and sending parameter information of the target resources to user equipment of the target SSB; the target resource is used for transmitting a non-contention random access preamble, and the preset resource set comprises PRACH resources which are configured in advance for the target cell by the base station and are available for service channels except Physical Uplink Control Channel (PUCCH) resources and cell-level Physical Random Access Channel (PRACH) resources. Therefore, the scheme of the invention can solve the problem that the access delay is increased due to too many or too few lead codes reserved by some SSB to a certain extent.

Description

Physical random access channel PRACH resource allocation method and device

Technical Field

The present invention relates to the field of mobile communications technologies, and in particular, to a method and an apparatus for allocating PRACH resources of a physical random access channel.

Background

The 5G New Radio (NR) introduces a corresponding relationship between a synchronization signal/physical broadcast channel signal block (or synchronization signal block) (Synchronization Signal and PBCH block, SSB) and a timing of random access (PRACH timing, RO). In a long term evolution (Long Term Evolution, LTE) system, only allocation is required by a dedicated preamble resource pool. However, in the 5G system, the allocation of the dedicated preamble needs to consider the SSB index of the access, but the SSB index and the RO hooking allocation may result in more discretization of the preamble resource allocation.

Wherein, 5G introduces the mapping relation between SSB and RO, and sets the preamble that each RO must have competition in the common configuration of cell level, and there may be no competition in the special configuration. Specifically, when one SSB corresponds to a plurality of ROs, the SSB index and the contention-based preamble (CB preamble) in the PRACH correspond to each other in the following order from the first point to the fourth point:

first, the CB preamble in each RO is incremented in the preamble index (preamble index) order;

a second point when configuring RACH FDM (i.e., frequency domain multiple ROs), incrementing according to the frequency domain index;

third, when configuring a plurality of ROs in the PRACH slot, increasing according to the index in the PRACH slot;

Fourth, when configuring a plurality of PRACH slots, the PRACH slot index is incremented.

For example, as shown in fig. 1, when SSB-perRACH-allocation (number of ROs mapped per SSB) =1/8, number of contended random accesses in one SSB n=60, one SSB is mapped to 8 ROs, CB preambles on each RO are preambles with indices of 0 to 59, respectively, and preambles with indices of 60 to 63 are non-contended.

Alternatively, for example, as shown in fig. 2, when SSB-perRACH-allocation=1 and the number of contended random accesses in one SSB n=56, one SSB is mapped to 1 RO, and CB preambles on each RO are preambles with indexes of 0 to 55, respectively.

Alternatively, for example, as shown in fig. 3, when SSB-perRACH-allocation=4 and the number of contended random accesses in one SSB is n=12, 4 SSBs are mapped to one RO, CB preambles corresponding to SSB1 are preambles with indexes 0 to 11, CB preambles corresponding to SSB2 are preambles with indexes 16 to 27, CB preambles corresponding to SSB3 are preambles with indexes 32 to 43, and CB preambles corresponding to SSB4 are preambles with indexes 48 to 59.

In addition, to ensure faster access for the user, it is generally configured that the mapping relationship between SSBs and ROs is that 8 SSBs are mapped to 1 RO, and each SSB contends preamble is allocated to 6, so that the number of non-contends preambles reserved for 8 SSBs is only 64-6*8 =16. If the number of dedicated preambles allocated at a time (i.e., non-contention preambles) exceeds 16, the remaining dedicated preamble allocation-requiring users can only proceed through contention random access, which may result in random access contention failure or access delay extension.

Furthermore, if it is desired to enlarge the resource pool of the dedicated preamble (i.e., the non-competing preamble), the mapping of SSBs and ROs needs to be set to a small value, such as setting 1 SSB to 2 ROs, and each RO competing preamble is allocated to 16, so that the number of non-competing preambles left for each SSB is 64×2-16×2=96. Thus, more users can access through non-contention, but not necessarily, each SSB needs so many non-contention preambles, and the RO that can be carried in each time slot has a protocol rule, if it cannot be carried in one time slot, it will be carried in the next available time slot, thus increasing the random access delay.

As can be seen from the above, in the prior art, when the PRACH resource is allocated, the mapping relationship between SSB and RO and the non-contention preamble available for each RO cannot be changed, that is, when the base station allocates the PRACH resource in the prior art, the same mapping relationship between SSB and RO and the same number of non-contention preambles available for one RO are configured for all SSBs. If less non-contention preambles are reserved, the UE not allocated to the non-contention preambles uses the contention random access preamble during handover, so that the time delay of random access is increased; if too many non-contention preambles are reserved, each RO must be reserved, and even if there is no SSB in need, the non-contention preambles need to be reserved, which is not flexible enough, wastes resources, and increases random access delay.

Disclosure of Invention

The embodiment of the invention provides a physical random access channel PRACH resource allocation method and device, which are used for solving the problems that in the prior art, the mapping relation between SSB and RO and the available non-competitive lead code of each RO cannot be changed, and the lead codes reserved by some SSB are too many or too few to increase access time delay.

In a first aspect, an embodiment of the present invention provides a method for allocating PRACH resources of a physical random access channel, where the method includes:

acquiring target SSB meeting preset conditions in a plurality of synchronous signals SSB of a target cell, wherein the preset conditions comprise that the number of user equipment switched to the same cell by the same SSB in a preset time period is larger than a first preset threshold;

selecting target resources reserved for the target SSB from a preset resource set, and sending parameter information of the target resources to user equipment of the target SSB;

the target resource is used for sending a non-contention random access preamble, and the preset resource set comprises PRACH resources which are configured in advance by a base station for the target cell and are available for service channels except Physical Uplink Control Channel (PUCCH) resources and cell-level Physical Random Access Channel (PRACH) resources.

In a second aspect, an embodiment of the present invention further provides a device for allocating PRACH resources of a physical random access channel, where the device includes:

a first obtaining module, configured to obtain a target SSB that meets a preset condition in a plurality of synchronization signals SSBs of a target cell, where the preset condition includes that the number of user equipments switched to the same cell by the same SSB in a preset time period is greater than a first preset threshold;

the resource reservation module is used for selecting target resources reserved for the target SSB in a preset resource set and sending parameter information of the target resources to user equipment of the target SSB;

In a third aspect, an embodiment of the present invention further provides an electronic device, where the electronic device includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, the steps in the method for allocating PRACH resources of a physical random access channel according to the first aspect are implemented.

In a fourth aspect, an embodiment of the present invention further provides a computer readable storage medium, on which a computer program is stored, the computer program implementing the steps in the method for allocating PRACH resources of a physical random access channel according to the first aspect above when being executed by a processor.

In the embodiment of the invention, the target SSB meeting the preset condition in the SSBs of the target cell can be obtained, so that the target resource reserved for the target SSB is selected from the preset resource set, and the parameter information of the target resource is sent to the user equipment of the target SSB. The preset resource set comprises PRACH resources which are configured by the base station in advance for the target cell and are available for service channels except PUCCH resources and cell-level PRACH resources, so that in the embodiment of the invention, the PRACH resources are reserved for the target SSB, and PUCCH transmission and cell-level PRACH transmission are not influenced.

In addition, the preset condition includes that the number of the user equipments handed over to the same cell through the same SSB in the preset time period is greater than a first preset threshold. Thus, there are a large number of user equipments in the target SSB that need to be centrally handed over to the cell. Therefore, in the embodiment of the invention, the PRACH resource is reserved only for the SSB with a large number of user equipment centralized switching requirements, so that the target SSB has enough preamble codes to be used when the cell switching is performed by a large number of user equipment centralized, and the PRACH resource is not reserved for the SSB without a large number of user equipment centralized switching requirements, thereby avoiding excessive preamble code reservation caused by reserving the PRACH resource for the SSB without a large number of user equipment centralized switching requirements to a certain extent. Therefore, the embodiment of the invention can solve the problem that the access delay is increased due to too many or too few preambles reserved by some SSB.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a diagram showing the mapping between SSB and RO in the prior art;

FIG. 2 is a second diagram of the mapping between SSB and RO in the prior art;

FIG. 3 is a third diagram illustrating the mapping between SSB and RO in the prior art;

fig. 4 is a flowchart illustrating steps of a method for allocating PRACH resources according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a scenario in which a target cell has a directional handover user in an embodiment of the present invention;

fig. 6 is a schematic diagram of a dedicated PRACH resource distribution in an embodiment of the present invention;

FIG. 7 is a schematic diagram of SSB0, SSB3, and SSB7 mapped RO when they are in different time domain positions;

FIG. 8 is a schematic diagram showing the comparison of adjacent and non-adjacent RO mapped by SSB0, SSB3 and SSB7 in the frequency domain;

fig. 9 is a block diagram of a physical random access channel PRACH resource allocation device according to an embodiment of the present invention;

Fig. 10 is a block diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B may be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may also determine B from a and/or other information.

Fig. 4 is a flow chart illustrating a method for allocating PRACH resources of a physical random access channel according to an embodiment of the present invention.

As shown in fig. 4, an embodiment of the present invention provides a method for allocating PRACH resources of a physical random access channel, which is applied to a base station, and the method includes:

step 401: and acquiring target SSB meeting preset conditions in a plurality of synchronous signals SSB of the target cell.

The preset condition includes that the number of the user equipment switched to the same cell through the same SSB in a preset time period is larger than a first preset threshold value. Therefore, there are a large number of user equipments in the target SSB that need to perform cell handover in a centralized manner.

Specifically, as shown in fig. 5, there are four cases of directional handover users in the target cell, where the rectangular box in fig. 5 is used to represent the usage scenario, and the line with an arrow is used to represent the direction in which the user enters the cell. There are four types of users in the target cell shown in fig. 5:

First category: high-speed rail users, for example all users, enter from SSB0, where the user entry cell trigger frequency is low, may be half an hour or several hours before users need to enter, and require particularly many user entries in a very short time.

The second category: light rail users, for example all users, enter from SSB3, where the frequency of triggers for user entry into the cell is low, only a few minutes, and relatively many users are required to enter in a short time.

Third category: expressway: all users enter from SSB7, where the triggering frequency of user entry into the cell is typically user entry per minute and the number of entering users is small relative to the first and second types described above.

Fourth category: other general users (e.g., square or cell users): the entry location is random and the trigger frequency of the user entering the cell is also random.

For each of the first to third types of users, the user moves to the SSB of the same cell, then the user appears in a pulse mode in a bundle, and then the user is silent, and finally the switching requirement is not met. Therefore, the first to third class users switch to the target cell through the same SSB in a certain period of time, so that the SSBs entered by the first to third class users are SSBs meeting the preset conditions. Thus, for the fourth class of users described above, the user's movements may be considered to be decentralized, averaged, and may still be allocated by the cell-level PRACH resources; and aiming at the users of the first class to the third class, the PRACH resource is allocated by adopting the PRACH resource allocation method of the embodiment of the invention.

It can be seen that, in the scenario shown in fig. 5, the base station is required to reserve PRACH resources for SSB0, SSB3 and SSB7, so as to provide a large number of dedicated preambles, but if the prior art PRACH resource allocation method described in the foregoing background section is used, the same size PRACH resources are reserved for SSB1, SSB2, SSB4, SSB5 and SSB6, but these SSBs do not actually have a requirement of centralized switching of a large number of users, which results in resource waste, and for the PRACH resources reserved for these SSBs, the resources are also completely wasted when there is no user switching period.

In the PRACH resource allocation method according to the embodiment of the present invention, for the scenario shown in fig. 5, PRACH resources may be reserved only for SSB0, SSB3 and SSB7, so as to provide enough dedicated preamble resources, but not for SSB1, SSB2, SSB4, SSB5 and SSB6, so that enough preambles may be used when SSB0, SSB3 and SSB7 perform cell handover in a large number of user equipments in a centralized manner, and the problem of resource waste is solved to a certain extent.

In addition, the direction angle of the SSB of the target cell is preset, so it can be determined, according to the direction indicated by the direction angle of the SSB of the target cell and the moving direction of each UE that needs to be switched to the target cell within a preset time period, which SSB the UE needs to be switched to the target cell (for example, the moving direction of one UE and the direction indicated by the direction angle of one SSB are less than the preset angle, the UE needs to be switched to the target cell by the SSB), and the number of UEs in each SSB can be counted, so as to determine which SSBs in the target cell meet the preset conditions.

Step 402: and selecting target resources reserved for the target SSB from a preset resource set, and sending the parameter information of the target resources to user equipment of the target SSB.

The target resource is used for sending a non-contention random access preamble, and the preset set of preset resources comprises PRACH resources which are configured in advance by a base station for the target cell and are available for service channels except Physical Uplink Control Channel (PUCCH) resources and cell-level Physical Random Access Channel (PRACH) resources. Therefore, the resources in the above-mentioned preset resource set are used for being reserved for SSBs meeting preset conditions, that is, for being reserved for the designated SSBs, and thus the resources in the above-mentioned resource set may be referred to as dedicated PRACH resources. For example, as shown in fig. 6, in a unit time, the resources included in the preset resource set are resources shown by diagonal line filling areas.

It can be known that, in the embodiment of the present invention, the PRACH resource reserved for the target SSB for transmitting the non-contention random access preamble is the dedicated PRACH resource, but does not occupy the cell-level PRACH resource, that is, in the embodiment of the present invention, the UE in the target SSB does not occupy the cell-level PRACH resource when transmitting the non-contention random access preamble. In the prior art, the UE may send the non-contention preamble using the PRACH resource at the cell level, so that, in comparison with the prior art, in the embodiment of the present invention, more PRACH resources are available for sending the non-contention preamble in the cell level configuration under the PRACH resource with the same bandwidth.

In addition, after reserving a target resource for transmitting a non-contention random access preamble for a target SSB, the preamble corresponding to the target resource is reserved for a UE that needs to access the SSB.

In addition, in the prior art, the PRACH period is not variable, so that the existence of unpredictable competitive random access users can lead all PRACH resources to be completely reserved, and occupied time-frequency domain positions can not be used as services, thus being very wasteful. In the embodiment of the invention, the target resources reserved for the target SSB are started when a large number of users need to perform cell switching in the target SSB, and the target resources are still reserved for service use when the target SSB is idle, so that the resource waste is further reduced.

In summary, as can be seen from the above description, in the prior art, the mapping relationship between SSBs and ROs exists in the 5G protocol, RO resources (i.e., PRACH resources with uplink transmission timing, i.e., PRACH resources for transmitting non-contention random access preambles) are reserved for all SSBs according to the protocol, which results in resource waste. In the embodiment of the present invention, RO resources are reserved only for the specified SSB, that is, users having no SSB other than the target SSB meeting the preset condition access through the dedicated PRACH resources.

Therefore, in the embodiment of the invention, the PRACH resource is reserved only for the SSB with a large number of user equipment centralized switching requirements, so that the target SSB can use enough preambles when a large number of user equipment centralized switching is performed on cells, but the PRACH resource is not reserved for the SSB without a large number of user equipment centralized switching requirements, so that the target SSB can use enough preambles when a large number of user equipment centralized switching is performed on cells, and the problem that too many preambles are reserved for the SSB without a large number of user equipment centralized switching requirements and the access delay is increased due to too many or too few preambles reserved for the SSB is avoided to a certain extent.

Optionally, the target SSB includes at least one SSB;

selecting a target resource reserved for the target SSB from a preset resource set, and sending parameter information of the target resource to user equipment of the target SSB, including:

acquiring a target time domain position, wherein the target time domain position comprises a target time domain position of a random access opportunity RO existing in a radio frame structure by PRACH resources in the preset resource set;

Obtaining a target expected number of each SSB included in the target SSB, wherein the target expected number is an expected number of user equipment handed over to the target cell through the same SSB in the preset time period;

determining a target mapping relation corresponding to the target expected number of each SSB included in the target SSB according to a corresponding relation between the predetermined target expected number and the target mapping relation, wherein the target mapping relation represents the number of RO mapped by one SSB;

determining the number of ROs mapped by each SSB included in the target SSB according to a target mapping relationship corresponding to the target expected number of each SSB included in the target SSB;

and selecting target resources reserved for each SSB included in the target SSB in the preset resource set according to the target time domain position, the number of RO mapped by each SSB included in the target SSB and the number of frequency division multiplexing FDM on one PRACH time slot, and sending parameter information of the target resources of each SSB included in the target SSB to user equipment corresponding to the SSB.

The target mapping relationship may be represented by SSB-perRACH-allocation, that is, different values of SSB-perRACH-allocation indicate that one SSB maps a different number of ROs. For example SSB-perRACH-occupancy=1, indicating that one SSB maps one RO; SSB-perRACH-occupancy=1/2, indicating that one SSB maps 2 ROs; SSB-perRACH-occupancy=1/4, indicating that one SSB maps 4 ROs.

In addition, in the embodiment of the present invention, the target mapping relationship indicates that one SSB maps at least one RO. If multiple SSBs map one RO, there may be a problem that SSB0 and SSB1 map the same RO, that is, the RO is reserved for SSB0 and SSB1, but SSB1 does not meet the above preset condition, so that SSB1 does not need to reserve the above target resource, and therefore, multiple SSBs map one RO may generate resource waste. However, when one SSB maps at least one RO, the above-described problem does not exist.

In addition, the number of users that need to switch may be different for different scenario types, such as in the scenario shown in fig. 5, there may be 240 bits of users of the high-speed rail type that enter SSB0 that need to switch cells within a first preset time, 100 bits of users of the light rail type that enter SSB3 that need to switch cells within a second preset time, and 50 bits of users of the highway type that enter SSB7 that need to switch cells within a third preset time. Therefore, the number of user equipments switched to the same cell in the preset time period can be acquired in advance according to each SSB included in the target SSB meeting the preset condition, and the target expected number of each SSB included in the target SSB is determined by taking the number as a reference, so that the corresponding relation between different SSBs and RO mapping relations (i.e. the target mapping relations) and different target expected numbers is established and stored.

Therefore, after the target expected number of a certain SSB is obtained, the number of the RO to be mapped by the SSB can be determined directly according to the corresponding relation between the prestored target mapping relation and the target expected number.

It can be known that in the embodiment of the present invention, the target resource may be reserved for the SSB according to the expected number of the user equipment that is handed over to the same cell by the same SSB in the preset time period, so that the reserved target resource may meet the handover requirement of the actual user, and excessive or insufficient resource reservation may be further avoided.

The target expected number of each SSB included in the target SSB may be specifically manually input to the target expected number of each SSB included in the target SSB, for example, the target expected number of each SSB included in the target SSB may be input in a man-machine interaction setting interface of the base station.

In addition, a target time domain location where the RO exists in one radio frame structure may be determined according to a PRACH configuration index (PRACH Configuration Index) of resources in a preset set of resources. In particular, specific parameters such as PRACH Configuration Index are shown in table 1 below.

Specific parameters of Table 1 PRACH Configuration Index

Wherein the Preamble format indicates a Preamble format, subframe number indicates a Subframe number where the PRACH resource is located, starting symbol indicates a Starting symbol of the PRACH resource in the RACH slot,indicates the number of PRACH slots in one subframe, +.>Representing the number of time domain ROs in RACH slot, +.>Representing the number of time domain symbols comprised by one frequency domain RO.

As can be seen from table 1, the starting position of the PRACH resource in one RACH slot is 0, and there are 6 ROs in one RACH slot, each RO occupies two time domain symbols. Wherein, when the configuration index is 103, the supported subcarrier intervals are 15kHz and 30kHz, and when the subcarrier interval is 15kHz, one RACH slot includes 14 symbols, then symbol 0 and symbol 1 are the first RO, symbol 2 and symbol 3 are the second RO, and so on, it can be determined that when the subcarrier interval is 15kHz, the starting symbols of PRACH resources in one RACH slot are 0, 2, 4, 6, 8, and 10, respectively. When the subcarrier spacing is 30kHz, one RACH slot includes 28 symbols, it can be determined that the starting symbols of PRACH resources in one RACH slot are 0, 2, 4, 6, 8, 10, 14, 16, 18, 20, 22, 24, respectively, when the subcarrier spacing is 30 kHz.

Optionally, the target SSB includes a first SSB and a second SSB;

the selecting, according to the target time domain location, the number of ROs mapped by each SSB included in the target SSB, and the number of FDMs on one PRACH slot, a target resource reserved for each SSB included in the target SSB in the preset resource set, and sending parameter information of the target resource of each SSB included in the target SSB to a user equipment of the corresponding SSB, where the parameter information includes:

under the condition that the first number is smaller than the number of FDM (frequency division multiplexing) on one PRACH time slot, acquiring the frequency domain starting position of PRACH resources in the preset resource set and taking the frequency domain starting position as a first value of a second parameter of the first SSB, wherein the first number is the number of RO mapped by the first SSB, and the second parameter is used for representing the offset of the frequency domain starting position of RO with an index of 0 relative to the frequency domain starting position of the current bandwidth;

transmitting a first configuration parameter to a user equipment of the first SSB, wherein the first configuration parameter comprises: a parameter representing a first one of the target time-domain locations, a target mapping corresponding to a target expected number of first SSBs, the first value of the second parameter;

Acquiring a frequency domain end position of a target resource reserved for the first SSB under the condition that the number of RBs included in FDM on one PRACH slot is larger than the sum of the number of RBs included in RO of a first target number and the number of RBs represented by a second preset threshold, wherein the first target number is the sum of the first number and a second number, and the second number is the number of ROs mapped by the second SSB;

calculating a second value of the second parameter of the second SSB when the frequency domain end position of the target resource reserved for the first SSB is spaced from the frequency domain start position of the target resource reserved for the second SSB by the second preset threshold;

and sending a second configuration parameter to the user equipment of the second SSB, wherein the second configuration parameter includes a parameter for representing a first time domain position in the target time domain positions, a target mapping relation corresponding to a target expected number of the second SSB, and the second value of the second parameter.

Wherein the second parameter is msg1-FrequencyStart. In addition, according to the msg1-FrequencyStart value of one SSB, the index of the RB reserved at the frequency domain starting position of the target resource of the SSB can be calculated. Specifically, the calculation formula is: msg1-frequencystart+a×b×k=c, where a denotes the number of ROs for one SSB map, b denotes the number of resource blocks RBs included in one RO, k denotes the index of SSB, and c denotes the index of RB at the frequency domain start position of the target resource reserved for SSB.

In addition, according to the second parameter, a frequency domain starting position of the target resource reserved for an SSB may be determined, and further according to the number of ROs mapped by the SSB and the number of RBs included by the one RO, a frequency domain range of the target resource reserved for the SSB may be determined.

Further, parameters for representing the time domain location of the RO of one SSB map include, for example, SSB index (SSB-index), SSB-perRACH-occupancy, PRACH Configuration Index. Wherein, according to PRACH Configuration Index, the time domain position of the RO in one radio frame structure can be obtained, and according to SSB-perRACH-allocation, it can be clear that SSB represented by SSB-index maps several ROs, so that according to the rule of adjacent frequency domain positions (i.e. adjacent frequency domain positions of ROs of adjacent SSB maps), it can be determined which time domain positions the SSB represented by SSB-index are distributed on, so that the parameters "SSB index (SSB-index), SSB-perRACH-allocation, PRACH Configuration Index" can represent the time domain position of one SSB mapped RO.

As can be seen from the above, when the PRACH resources are allocated by the base station, the relevant parameters of the corresponding resources may be sent to the UE, so that the UE may determine the time domain and the frequency domain of the corresponding resources according to the parameters. For example, when the base station reserves PRACH resources for the SSB, the number of ROs mapped by the SSB and the value of the second parameter are notified to the UE, so that the UE can determine the frequency domain location of the PRACH resources reserved for the SSB by the base station.

Optionally, the second preset threshold is 0, that is, in the embodiment of the present invention, the target resources reserved for the first SSB and the second SSB may be adjacent in the frequency domain.

If the target SSB further includes a third SSB, after the second configuration parameter is sent to the ue of the second SSB, the method further includes the following steps:

acquiring a frequency domain end position of a target resource reserved for the second SSB under the condition that the number of RBs included in FDM on one PRACH slot is greater than the sum of the number of RBs included in RO of a third target number and the number of RBs represented by 2 times of a second preset threshold, wherein the third target number is the sum of the first number, the second number and a third number, and the third number is the number of ROs mapped by the third SSB;

calculating a sixth value of the second parameter of the third SSB when the frequency domain end position of the target resource reserved for the second SSB is spaced from the frequency domain start position of the target resource reserved for the third SSB by the second preset threshold;

and sending a sixth configuration parameter to the user equipment of the third SSB, wherein the sixth configuration parameter includes a parameter for representing a first time domain position in the target time domain positions, a target mapping relationship corresponding to the target expected number of the third SSB, and the sixth value of the second parameter.

As can be seen from the above, when at least two SSBs are included in the target SSB, if FDM on one PRACH slot is sufficiently large, resources adjacent in the frequency domain can be reserved in the same PRACH slot for each SSB included in the target SSB, so that uplink traffic scheduling of the user can be continuous.

Optionally, the calculating, when the frequency domain end position of the target resource reserved for the first SSB is spaced from the frequency domain start position of the target resource reserved for the second SSB by the second preset threshold, the second value of the second parameter of the second SSB includes:

according to a first preset formula x+a b k=c ₁ +d+1, calculating a second value X of said second parameter of said second SSB;

wherein a represents the second number, b is as followsShowing the number of Resource Blocks (RBs) included in one RO, k representing the index of the second SSB, d representing the number of RBs indicated by the second preset threshold, c ₁ An index representing an RB at a frequency domain end position of the target resource reserved for the first SSB.

For example, if the first SSB is SSB0, the second SSB is SSB3, the third SSB is SSB7, and SSB0 needs to map 4 ROs, SSB3 needs to map 2 ROs, SSB7 needs to map one RO, and the frequency domain starting position of the PRACH in the preset resource set is an RB with index of 24, then if one RO includes 12 RBs, if the number of FDMs on one PRACH slot is greater than or equal to the total number of ROs required to be mapped by SSB0, SSB3, and SSB7, the PRACH resources reserved for SSB0, SSB3, and SSB7 may be adjacent in the frequency domain, and the frequency domain range of the PRACH resource reserved for SSB0 is: 24-24 (24+12 x 4-1), i.e. 24-71, the range of PRACH resources reserved for SSB3 is 72-72 (72+12 x 2-1), i.e. 72-95, and the range of PRACH resources reserved for SSB7 is 96-96 (96+12-1), i.e. 96-107.

From this, it can be seen that the frequency domain end position of the PRACH resource reserved for SSB0 is 71RB, the number of ROs mapped by SSB3 is 2, the index of SSB3 is 3, the number of intervals RB between SSB0 and SSB3 is 0, and one RO includes 12 RBs, and if these values are substituted into the first preset formula, x+2x12x3= 71+1 can be obtained, and x=0, that is, the msg1-FrequencyStart value of SSB3 is 0RB.

The frequency domain end position of the PRACH resource reserved for SSB3 is 95RB, the number of ROs mapped by SSB7 is 1, the index of SSB7 is 7, the number of intervals RB between SSB3 and SSB7 is 0, and one RO includes 12 RBs, and then these values are substituted into the first preset formula, so that x+1x11x1= 95+1 can be obtained, and x=12 can be obtained, that is, the msg1-FrequencyStart value of SSB7 is 12RB.

Optionally, in the case that the first SSB maps a plurality of ROs, the first configuration parameter further includes first indication information, where the first indication information is used to indicate ROs used by the user equipment of the first SSB to send a preamble;

in case that the second SSB maps a plurality of ROs, the second configuration parameter further includes second indication information, and the first indication information is used to indicate ROs used by the user equipment of the second SSB to transmit a preamble.

It is known that when one SSB maps a plurality of ROs, it is also necessary to instruct each UE in the SSB which one of the ROs mapped by the SSB to use to transmit the preamble. The first indication information may be occidionmassindex, that is, different values of occidionmassindix are adopted, which indicates that the preamble is sent on different ROs from the ROs mapped with the SSB. For example, when occidionmassindix=1, it means that the UE will select the first RO from the ROs mapped by the SSB to access; when occidionmassindix=2, it means that the UE will select a second RO from the ROs mapped by the SSB to access.

As can be seen from the above, when the frequency domain starting position of the PRACH in the preset resource set is an RB with an index of 24, and the frequency domain range of the PRACH resource reserved for SSB0 is: 24-71 RB, the PRACH resources reserved for SSB3 range from 72RB to 95RB, and the PRACH resources reserved for SSB7 range from 96RB to 107RB, the parameters (i.e., frequency domain configuration parameters) for determining the frequency domain location transmitted by the base station to each UE of SSB0, SSB3, and SSB7 may be as shown in table 2 below.

Table 2 frequency domain configuration parameters of SSB0, SSB3 and SSB7

In addition, in the case where the value of FDM is smaller than the total number of ROs mapped by two SSBs, one of the two SSBs needs to be mapped with the RO at the first time-domain position and the other one needs to be mapped with the RO at the second time-domain position of the target time-domain positions. For example, when msg 1-fdm=4, SSB0 needs to map 4 ROs, SSB3 needs to map 2 ROs, and SSB7 needs to map 1 RO, the distribution of ROs mapped by SSB0, SSB3, and SSB7 may be as shown in fig. 7, that is, SSB0 maps with 4 ROs in the first time domain location, SSB3 maps with two ROs in the second time domain location, and SSB7 maps with one RO in the second time domain location.

Optionally, the selecting, in the preset resource set, a target resource reserved for the target SSB, and sending parameter information of the target resource to the user equipment of the target SSB includes:

determining user equipment continuously belonging to the same SSB in a target sequence as a group to obtain at least one group, wherein the target sequence is the sequence of switching each user equipment in the target SSB to the target cell;

determining, for each packet, each second target number of user equipments adjacent to each other in the target sequence as a type of user equipment, wherein after determining each second target number of user equipments adjacent to each other in one packet as a type of user equipment, if the number of remaining user equipments in one packet is smaller than the second target number, determining the remaining user equipments in the packet as a type of user equipment, where the second target number is the number of preambles included in one RO;

And selecting target resources reserved for each type of user equipment in the preset resource set according to the rule that each type of user equipment needs to reserve an RO, and sending parameter information of the target resources of each type of user equipment to the user equipment of the corresponding type.

That is, in the embodiment of the present invention, when the PRACH resource is reserved for each SSB included in the target SSB, UEs in the SSBs are first ordered according to the sequence of switching to the target cell, then UEs belonging to the same SSB are determined as one group, then for each group, UEs of every adjacent second target number are determined as one class, wherein the remaining UEs in each group are not less than the second target number and are also determined as one class, and finally, one RO is reserved for each class of UEs.

The number of the UEs included in the one type of UEs is smaller than or equal to the number of the preambles included in one RO, so that one RO is reserved for the one type of UEs, and the one type of UEs can be satisfied.

It can be known that in the embodiment of the present invention, the target resource may be reserved for the SSB according to the actual number of the user equipment that is handed over to the same cell by the same SSB in the preset time period, so that the reserved target resource may meet the handover requirement of the actual user, and excessive or insufficient resource reservation may be further avoided.

Optionally, the target SSB includes a first SSB, a first type of user equipment and a second type of user equipment exist in the first SSB, and in the target ordering, the second type of user equipment is located after the first type of user equipment;

according to the rule that each type of user equipment needs to reserve an RO, selecting target resources reserved for each type of user equipment in the preset resource set according to the target time domain position, and sending parameter information of the target resources of each type of user equipment to the user equipment of the corresponding type, wherein the method comprises the following steps:

acquiring a frequency domain starting position of PRACH resources in the preset resource set and taking the frequency domain starting position as a third value of a second parameter of the first SSB, wherein the second parameter is used for representing offset of the frequency domain starting position of RO with an index of 0 relative to the frequency domain starting position of the current bandwidth;

transmitting a third configuration parameter to the first class of user equipment, wherein the third configuration parameter comprises a parameter for representing a first time domain position in the target time domain position and the third value of the second parameter;

calculating a fourth value of a second parameter of the first SSB when a frequency domain end position of a target resource reserved for the first type user equipment is spaced from a frequency domain start position of the target resource reserved for the second type user equipment by a second preset threshold value under the condition that the number of RBs included in FDM on one PRACH time slot is larger than the sum of the number of RBs included in one RO and the number of RBs represented by the second preset threshold value;

And sending a fourth configuration parameter to the second class of user equipment, wherein the fourth configuration parameter comprises a parameter for representing a first time domain position in the target time domain positions and the fourth value of the second parameter.

The fourth value is the sum of the third value and the number of RBs included in one RO. That is, for two UEs belonging to the same SSB class, the difference between the value of the second parameter received by one class UE and the value of the second parameter received by the other class UE is the number of RBs included in one RO.

In addition, if the first SSB further includes other types of user equipment besides the first type of user equipment and the second type of user equipment, the same method as described above may be used to reserve the target resources for the user equipment.

As can be seen from the above, when the target SSB includes the first SSB and the first SSB includes the two types of UEs, if FDM on one PRACH slot is sufficiently large, resources adjacent in the frequency domain can be reserved for the two types of UEs in the same PRACH slot, so that uplink traffic scheduling of the user can be continuous.

Optionally, the target SSB further includes a second SSB, a third type of user equipment exists in the second SSB, and in the target ordering, the third type of user equipment is located after the second type of user equipment;

According to the rule that each type of user equipment needs to reserve an RO, selecting target resources reserved for each type of user equipment in the preset resource set according to the target time domain position, and sending parameter information of the target resources of each type of user equipment to the user equipment of the corresponding type, and further comprising:

acquiring a frequency domain end position of target resources reserved for the second type of user equipment under the condition that the number of RBs included in FDM on one PRACH time slot is larger than the sum of the number of RBs included in three RO and the number of RBs represented by 2 times of a second preset threshold;

calculating a fifth value of the second parameter of the second SSB when the frequency domain end position of the target resource reserved for the second class of user equipment is spaced from the frequency domain start position of the target resource reserved for the third class of user equipment by the second preset threshold;

and sending a fifth configuration parameter to the third class of user equipment, wherein the fifth configuration parameter comprises a parameter for representing a first time domain position in the target time domain positions and the fifth value of the second parameter.

As can be seen from the above, for two types of UEs that do not belong to the same SSB, if FDM on one PRACH slot is large enough, resources adjacent to each other in the frequency domain can be reserved for the two types of UEs in the same PRACH slot, so that uplink traffic scheduling of the user can be continuous.

Optionally, the calculating, when the frequency domain end position of the target resource reserved for the second class of user equipment is spaced from the frequency domain start position of the target resource reserved for the third class of user equipment by the second preset threshold, the fifth value of the second parameter of the second SSB includes:

k=c according to a second preset formula y+b ₂ +d+1, calculating a fifth value Y of said second parameter of said second SSB;

wherein b represents the number of RBs included in one RO, k represents the index of the second SSB, d represents the number of RBs indicated by the second preset threshold, c ₂ And representing an index of the RB at a frequency domain end position of the target resource reserved for the second class user equipment.

If 8 SSBs exist in the target cell, three SSBs meet the preset condition, namely, the UE in the high-speed railway scene is switched in from SSB0, and the handover of 240 UEs per second is required; the UE in the light rail scene is switched in from SSB3, and 80 UEs need to be switched every second; a user in a high-speed scenario is handed in from SSB7, requiring a handover of 30 UEs per second. And msg1-FDM takes the maximum value of 8, and the PUCCH and PRACH at the cell level occupy 24 RBs at the bottom end of the uplink bandwidth, so that the reserved resources are as follows according to the sequence of switching the UE to the target cell:

The 0-191UE of SSB0 performs hand-in, the base station reserves 3 parts of RO resources for the base station, and uses PRB24-59 for 36 RBs;

the 0-63UE of SSB3 performs hand-in, the base station continues to reserve 1 part of RO resource, and uses PRB60-71 for 12 RBs;

192-239 (i.e. 47 users) of SSB0 UE performs hand-in, the base station continues to reserve 1 part of RO resource, and uses PRB72-83 for 12 RBs;

the 0-29UE of SSB7 performs hand-in, the base station continues to reserve 1 part of RO resource, and uses PRB84-95 for 12 RBs;

the 64-79UE of SSB3 performs hand-in (namely 15 users), the base station continues to reserve 1 part of RO resource, and uses PRB84-95 for 12 RBs;

at this time, all UEs have allocated dedicated preambles, and the remaining bandwidth from 95RB to the upper edge of the bandwidth can be continuously used for the traffic channel.

Specifically, according to the above resource reservation case, parameters (i.e., frequency domain configuration parameters) for determining the frequency domain location, which are transmitted from the base station to each UE of SSB0, SSB3, and SSB7, may be as shown in table 3 below. Therefore, the embodiment of the invention can achieve the aim that different SSBs support different numbers of users by configuring parameters of different frequency domains of different categories of users of the same SSB.

Table 3 frequency domain configuration parameters of SSB0, SSB3 and SSB7

	Specific configuration parameters
		0 to 63UE in SSB0	msg1-FrequencyStart＝24
64-127 UE in SSB0	msg1-FrequencyStart＝36
		128-191 UE in SSB0	msg1-FrequencyStart＝48
192-255 UE in SSB3	msg1-FrequencyStart＝24
		192-255 UE in SSB0	msg1-FrequencyStart＝72
64-127 UE in SSB7	msg1-FrequencyStart＝0
		64-127 UE in SSB3	msg1-FrequencyStart＝60

It should be noted that, for the above-described target SSB satisfying the preset condition, it is necessary to complete the cell handover of the UE in a short time, and the case where all SSBs included in the target SSB are mapped for a plurality of rounds in one period has no advantage for non-contention random access, so it is necessary to let all users perform the cell handover in one subframe as much as possible, and thus it is necessary to enlarge the number of ROs in one subframe. Since the number of ROs in each PRACH slot and the number of PRACH slots in each subframe are fixed, the number of FDMs needs to be increased, and thus in the embodiment of the present invention, the number of frequency division multiplexing FDMs (i.e., msg 1-FDM) on one PRACH slot needs to be set to a larger value, that is, the number of RBs included in FDM on one PRACH slot is greater than or equal to the sum of the number of RBs included in the total number of ROs of all SSB mappings included in the target SSB and the number of RBs represented by M times the second preset threshold, where M represents the number of SSBs included in the target SSB.

In summary, in the embodiment of the present invention, PRACH resources are reserved in a short time when the UE of the directional traffic (i.e., the UE in the SSB meeting the above-mentioned preset conditions) performs handover, and the service is reserved when there is no user handover.

Furthermore, according to the characteristic that the user without directional flow (i.e. the UE in the SSB which does not meet the preset condition) does not need to reserve the PRACH resource, the PRACH resource reserved for the SSB meeting the preset condition can be mapped flexibly by using the time condition of the bandwidth of the service through the protocol parameter msg1-FrequencyStart, so that the PRACH resource adjacent on the frequency domain is made, thereby saving the bandwidth, that is, integrating the PRACH resource which does not need to be mapped by the SSB, reducing the idle waste of the frequency domain through the protocol parameter, and leaving the whole segment of PUSCH resource for the user.

For example, when one RO needs to be mapped for SSB0, SSB3 and SSB7, and the frequency domain starting position of the PRACH resource in the preset resource set is 96RB, msg 1-fdm=8, and one RO includes 12 RBs, if the configuration is directly performed according to the protocol in the prior art, msg1-FrequencyStart of SSB0, SSB3 and SSB7 are all set to 96, the PRACH resources reserved for SSB0, SSB3 and SSB7 are not adjacent in time domain, as shown in fig. 8; by adopting the PRACH resource allocation method of the embodiment of the invention, the msg1-FrequencyStart values of SSB3 and SSB7 can be adjusted so that PRACH resources reserved by SSB0, SSB3 and SSB7 are adjacent in time domain, as shown in figure 8.

Furthermore, different PRACH resources (i.e. preamble resources) can be provided according to users with different scene types, so that the contention random access is reduced, and the processing of the base station access flow is reduced. For example, according to the expected user cut-in situation under different scene types, the aim of accessing different ROs by different users can be achieved by adjusting the mapping relation between SSB and RO and different values of occidionmassindix; or the PRACH resources can be allocated according to the switching-in conditions of actual users under different scene types, and the PRACH resources are allocated when the switching requirements of the users exist, so that the time-frequency domain position is flexibly occupied, and the waste of frequency spectrum resources is reduced.

The physical random access channel PRACH resource allocation method provided by the embodiment of the present invention is described above, and the physical random access channel PRACH resource allocation device provided by the embodiment of the present invention will be described below with reference to the accompanying drawings.

Referring to fig. 9, the embodiment of the present invention further provides a device for allocating PRACH resources, where the device includes:

a first obtaining module 901, configured to obtain a target SSB that meets a preset condition in a plurality of synchronization signals SSBs of a target cell, where the preset condition includes that the number of user equipments switched to the same cell by the same SSB in a preset time period is greater than a first preset threshold;

A resource reservation module 902, configured to select a target resource reserved for the target SSB in a preset resource set, and send parameter information of the target resource to a user equipment of the target SSB;

Optionally, the target SSB includes at least one SSB;

the resource reservation module 902 includes:

a time domain position obtaining sub-module, configured to obtain a target time domain position, where the target time domain position includes a target time domain position where a random access opportunity RO exists in a radio frame structure of PRACH resources in the preset resource set;

an expected number obtaining sub-module, configured to obtain a target expected number of each SSB included in the target SSB, where the target expected number is an expected number of user equipments handed over to the target cell through the same SSB in the preset time period;

a mapping relation determining sub-module, configured to determine, according to a predetermined correspondence relation between a target expected number and a target mapping relation, a target mapping relation corresponding to the target expected number of each SSB included in the target SSB, where the target mapping relation represents a number of ROs mapped by one SSB;

A mapping number determination submodule for determining the number of ROs mapped by each SSB included in the target SSB according to a target mapping relationship corresponding to the target expected number of each SSB included in the target SSB;

and a first configuration submodule, configured to select, in the preset resource set, a target resource reserved for each SSB included in the target SSB according to the target time domain position, the number of ROs mapped by each SSB included in the target SSB, and the number of frequency division multiplexing FDM on one PRACH slot, and send parameter information of the target resource of each SSB included in the target SSB to a user equipment corresponding to the SSB.

Optionally, the target SSB includes a first SSB and a second SSB;

the first configuration submodule is specifically configured to:

Optionally, when calculating the second preset threshold value between the frequency domain end position of the target resource reserved for the first SSB and the frequency domain start position of the target resource reserved for the second SSB, the first configuration sub-module is specifically configured to:

wherein a represents the second number, b represents the number of resource blocks RBs included in one RO, k represents the index of the second SSB, d represents the number of RBs indicated by the second preset threshold, c ₁ An index representing an RB at a frequency domain end position of the target resource reserved for the first SSB.

Optionally, the resource reservation module 902 includes:

a grouping sub-module, configured to determine user equipment continuously belonging to the same SSB in a target ordering as a group, and obtain at least one group, where the target ordering is a sequence in which each user equipment in the target SSB is switched to the target cell;

a classification sub-module, configured to determine, for each packet, a second target number of user equipments per neighbor in the target rank as a class of user equipments, where after determining the second target number of user equipments per neighbor in one packet as a class of user equipments, if the number of remaining user equipments in one packet is smaller than the second target number, determining the remaining user equipments in the packet as a class of user equipments, where the second target number is a number of preambles included in one RO;

and the second configuration submodule is used for reserving a rule of RO according to each type of user equipment, selecting target resources reserved for each type of user equipment in the preset resource set according to the target time domain position, and sending parameter information of the target resources of each type of user equipment to the user equipment of the corresponding type.

the second configuration submodule is specifically configured to:

the second configuration sub-module is further configured to:

Optionally, when calculating the frequency domain end position of the target resource reserved for the second class of user equipment and the frequency domain start position of the target resource reserved for the third class of user equipment, the second configuration sub-module is specifically configured to:

The physical random access channel PRACH resource allocation device provided by the embodiment of the present invention can implement each process implemented by the base station side in the method embodiments of fig. 1 to 8, and in order to avoid repetition, the description is omitted here.

In the embodiment of the invention, the target SSB meeting the preset condition in the SSBs of the target cell can be obtained, so that the target resource reserved for the target SSB is selected from the preset resource set, and the parameter information of the target resource is sent to the user equipment of the target SSB. The preset resource set includes PRACH resources which are configured by the base station in advance for the target cell and are available for service channels except for the PUCCH resources and the cell-level PRACH resources, so in the embodiment of the present invention, the PRACH resources are reserved for the target SSB, and PUCCH transmission and cell-level PRACH transmission are not affected.

In addition, the preset condition includes that the number of the user equipments handed over to the same cell through the same SSB in the preset time period is greater than a first preset threshold. Thus, there are a large number of user equipments in the target SSB that need to be centrally handed over to the cell. Therefore, in the embodiment of the invention, the PRACH resource is reserved only for the SSB with a large number of user equipment centralized switching requirements, so that the target SSB can be used when a large number of user equipment centralized switching is performed on a cell, and the PRACH resource is not reserved for the SSB without a large number of user equipment centralized switching requirements, thereby avoiding excessive preamble reservation caused by reserving the PRACH resource for the SSB without a large number of user equipment centralized switching requirements to a certain extent, and therefore, the embodiment of the invention can solve the problem that the access delay is increased due to excessive or too few preamble reserved by some SSB to a certain extent.

In another aspect, an embodiment of the present invention further provides an electronic device, including a memory, a processor, a bus, and a computer program stored in the memory and capable of running on the processor, where the processor implements the steps in the method for allocating PRACH resources of a physical random access channel when the processor executes the program.

For example, fig. 10 shows a schematic diagram of the physical structure of an electronic device.

As shown in fig. 10, the electronic device 1000 may include: a processor 1010, a communication interface (Communications Interface) 1020, a memory 1030, and a communication bus 1020, wherein the processor 1010, the communication interface 1040, and the memory 1030 communicate with each other via the communication bus 1020. Processor 1010 may call logic instructions in memory 1030 to perform the following methods:

Further, the logic instructions in the memory 1030 described above may be implemented in the form of software functional units and stored in a computer readable storage medium when sold or used as a stand alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

In still another aspect, an embodiment of the present invention further provides a computer readable storage medium, on which a computer program is stored, where the computer program is implemented when executed by a processor to perform the method for allocating PRACH resources of a physical random access channel provided in the foregoing embodiments, for example, includes:

The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for allocating PRACH resources of a physical random access channel, the method comprising:

2. The method for PRACH resource allocation according to claim 1, wherein the target SSB includes at least one SSB;

Acquiring a target time domain position, wherein the target time domain position is a time domain position of a random access opportunity RO existing in a radio frame structure of PRACH resources in the preset resource set;

3. The method for PRACH resource allocation according to claim 2, wherein the target SSB includes a first SSB and a second SSB;

4. The method for physical random access channel PRACH resource allocation according to claim 3, wherein,

in the case that the first SSB maps a plurality of ROs, the first configuration parameter further includes first indication information, where the first indication information is used to indicate ROs used by the user equipment of the first SSB to transmit a preamble;

5. The method of claim 3, wherein the calculating the second value of the second parameter of the second SSB when the frequency domain end position of the target resource reserved for the first SSB is spaced apart from the frequency domain start position of the target resource reserved for the second SSB by the second preset threshold value comprises:

6. The method for PRACH resource allocation according to claim 1, wherein selecting a target resource reserved for the target SSB from a preset resource set and transmitting parameter information of the target resource to a ue of the target SSB includes:

7. The method of claim 6, wherein the target SSB includes a first SSB, wherein a first type of user equipment and a second type of user equipment exist in the first SSB, and wherein the second type of user equipment is located after the first type of user equipment in the target ordering;

8. The method of claim 7, wherein the target SSB further comprises a second SSB, wherein a third class of user equipment is present in the second SSB, and wherein the third class of user equipment is located after the second class of user equipment in the target ordering;

9. The method of PRACH resource allocation according to claim 8, wherein said calculating a fifth value of the second parameter of the second SSB when the frequency domain end position of the target resource reserved for the second class of user equipment is spaced from the frequency domain start position of the target resource reserved for the third class of user equipment by the second preset threshold value comprises:

10. A physical random access channel, PRACH, resource allocation apparatus, the apparatus comprising:

11. An electronic device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, wherein the computer program when executed by the processor implements the steps of the physical random access channel, PRACH, resource allocation method of any of claims 1 to 9.

12. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the physical random access channel PRACH resource allocation method according to any of claims 1 to 9.