CN112584537B - PRACH resource configuration method and device - Google Patents

PRACH resource configuration method and device Download PDF

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Publication number
CN112584537B
CN112584537B CN201910939506.1A CN201910939506A CN112584537B CN 112584537 B CN112584537 B CN 112584537B CN 201910939506 A CN201910939506 A CN 201910939506A CN 112584537 B CN112584537 B CN 112584537B
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prach
coverage enhancement
prach resources
resources
ssb
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CN112584537A (en
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吴丹
胡丽洁
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a PRACH resource configuration method and device, wherein the PRACH resource configuration method comprises the following steps: according to the configuration information of PRACH resources, determining target PRACH resources corresponding to the coverage enhancement level of the PRACH resources; and carrying out random access on the target PRACH resource. The invention solves the problem of the corresponding relation between the PRACH resource of the repeatedly transmitted SSB and the coverage grade of the terminal, so that the network side knows the coverage enhancement grade corresponding to the terminal when receiving the PRACH resource.

Description

PRACH resource configuration method and device
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for configuring PRACH resources.
Background
In the cell search process, after the terminal acquires the SSB (Synchronization Signal Block ) and receives the synchronization and broadcast information, the terminal needs to further acquire the random access information to realize the cell access. In the design of 5G NR (5G New radio,5G New radio station), an association mapping relation between random access resources and SSB is introduced, when a terminal transmits a random access sequence, the terminal only transmits the random access sequence on PRACH (Physical Random Access Channel ) transmission opportunity corresponding to a specific SSB, so that 'implicit' reporting of downlink SSB beam selection is realized, and beam scanning overhead in a subsequent flow is reduced by using the PRACH support on multiple beams.
The mapping of SSB and PRACH transmission opportunity is carried out according to the sequence of sequence resource, frequency domain resource and time domain resource. Therefore, the terminal obtains the time-frequency position of the PRACH transmission opportunity corresponding to each SSB index according to the PRACH configuration information configured by the resident cell, and when the random access sequence is sent, the terminal selects the associated random access code and transmission time-frequency resource according to the SSB detected by the terminal. The base station side can also acquire the SSB sequence number selected by the terminal according to the mapping relation between the SSB and the PRACH resource, so that the beam corresponding to the SSB can be used for transmitting downlink information such as subsequent Msg2, msg4 and the like to the terminal, and the preliminary determination of the downlink beam is realized in the random access stage.
In NR real network deployment, there may be some scenarios, resulting in the presence of coverage shortboards in certain directions. For example, under the coverage of the same cell, one direction has dense trees or buildings, and the signal propagation in the direction can experience larger attenuation, so that the coverage in the direction is poor, the user rate is low, the coverage is contracted, and the coverage short plates of the cell appear. The most straightforward way to solve this problem is to add a repeater or relay, even a new cell to cover these areas, but this means more hardware is put in and the cost is increased.
Since NR supports transmission of multiple SSBs in the same cell, different users may access to SSBs on different synchronization grids during the search process, thereby implementing multiple candidate initial BWP (bandwidth Part) access. With this feature of NR, different coverage requirements within a cell, e.g. 8 beams SSB normal on one BWP, corresponding to 8 different beam directions, respectively, may be achieved by sending different SSBs on different BWP, covering users of different directions of the cell. On another BWP is repeated transmission of SSBs corresponding to a certain beam direction a plurality of times, in which case repeated SSBs are provided on the repeated transmission BWP, the plurality of SSBs transmitting on the same beam, and for terminals accessing on this BWP it is no longer necessary to distinguish the beam direction, but the level of coverage.
Therefore, when multiple SSBs of the BWP have the same beam, the "implicit" indication of SSB beam using PRACH transmission opportunities does not enable the base station to know the coverage enhancement level of the terminal, because the base station knows that the beams corresponding to repeated SSBs are the same, in which case the correspondence between PRACH resources corresponding to PRACH transmission opportunities of multiple SSBs that are repeatedly transmitted and the coverage level needs to be resolved.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a method and an apparatus for configuring PRACH resources, which solve a problem of correspondence between PRACH resources and coverage levels of SSBs that are repeatedly transmitted, so that a network side can know a coverage enhancement level corresponding to a terminal when receiving a target PRACH resource.
In order to solve the technical problems, the invention is realized as follows:
in a first aspect, a method for configuring PRACH resources is provided, which is applied to a terminal, and includes: according to the configuration information of PRACH resources, determining target PRACH resources corresponding to the coverage enhancement level of the PRACH resources; and carrying out random access on the target PRACH resource.
Optionally, the configuration information of the PRACH resource includes: and mapping relation between SSB and PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
Optionally, the configuration information of the PRACH resource includes: the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the PRACH resource corresponding to the SSB index and the coverage enhancement level; and each SSB index corresponds to K PRACH resources, the coverage enhancement levels are L, wherein the K PRACH resources corresponding to each SSB index are divided into L parts, each part corresponds to different coverage enhancement levels, and K and L are positive integers which are greater than or equal to 1.
Optionally, the configuration information of the PRACH resource includes: a mapping relation between PRACH resources and coverage enhancement levels;
and Y PRACH resources are shared in each PRACH association pattern period, and the coverage enhancement levels are L, wherein the Y PRACH resources are divided into L parts, and each part corresponds to a different coverage enhancement level.
Optionally, the PRACH association pattern period includes one or more association pattern periods, and the mapping relationship between all PRACH retransmission opportunities and SSB indexes in each coverage enhancement level is repeated among a plurality of association pattern periods. The PRACH association pattern period is T, T is less than or equal to N times of 160ms, and N is the maximum PRACH repetition number. In a second aspect, a method for configuring PRACH resources is provided, which is applied to a network side and includes:
transmitting configuration information of PRACH resources; and determining the coverage enhancement level corresponding to the terminal according to the received target PRACH resource information.
Optionally, the sending the configuration information of the PRACH resource includes: and sending the mapping relation between the SSB and the PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
Optionally, the sending the configuration information of the PRACH resource includes: the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the PRACH resource corresponding to the SSB index and the coverage enhancement level; the coverage enhancement levels are L, wherein the K PRACH resources corresponding to each SSB index are divided into L parts, and each part corresponds to different coverage enhancement levels, and K and L are positive integers greater than or equal to 1.
Optionally, the sending the configuration information of the PRACH resource includes: a mapping relation between PRACH resources and coverage enhancement levels; and Y PRACH resources are shared in each PRACH association pattern period, and the coverage enhancement levels are L, wherein the Y PRACH resources are divided into L parts, and each part corresponds to a different coverage enhancement level.
In a third aspect, there is also provided a terminal, including: the receiving and transmitting module is used for carrying out random access on the target PRACH resource; and the processing module determines a target PRACH resource corresponding to the coverage enhancement level of the processing module according to the configuration information of the PRACH resource.
Optionally, the configuration information of the PRACH resource includes: and sending the mapping relation between the SSB and the PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
Optionally, the configuration information of the PRACH resource includes: the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the PRACH resource corresponding to the SSB index and the coverage enhancement level; the coverage enhancement levels are L, wherein the K PRACH resources corresponding to each SSB index are divided into L parts, and each part corresponds to different coverage enhancement levels, and K and L are positive integers greater than or equal to 1.
Optionally, the configuration information of the PRACH resource includes: a mapping relation between PRACH resources and coverage enhancement levels; and Y PRACH resources are shared in each PRACH association pattern period, and the coverage enhancement levels are L, wherein the Y PRACH resources are divided into L parts, and each part corresponds to a different coverage enhancement level.
In a fourth aspect, there is also provided a terminal, including: a transceiver and a processor; the transceiver is configured to perform random access on the target PRACH resource; and the processor is used for determining the target PRACH resource corresponding to the self coverage enhancement level according to the configuration information of the PRACH resource.
Optionally, the configuration information of the PRACH resource includes: and sending the mapping relation between the SSB and the PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
Optionally, the configuration information of the PRACH resource includes: the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the PRACH resource corresponding to the SSB index and the coverage enhancement level; the coverage enhancement levels are L, wherein the K PRACH resources corresponding to each SSB index are divided into L parts, and each part corresponds to different coverage enhancement levels, and K and L are positive integers greater than or equal to 1.
Optionally, the configuration information of the PRACH resource includes: a mapping relation between PRACH resources and coverage enhancement levels; and Y PRACH resources are shared in each PRACH association pattern period, and the coverage enhancement levels are L, wherein the Y PRACH resources are divided into L parts, and each part corresponds to a different coverage enhancement level.
In a fifth aspect, there is also provided a network side device, including: the receiving and transmitting module is used for transmitting the configuration information of the PRACH resources; and the processing module is used for determining the coverage enhancement level corresponding to the terminal according to the received target PRACH resource information.
Optionally, the sending the configuration information of the PRACH resource includes: and sending the mapping relation between the SSB and the PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
Optionally, the sending the configuration information of the PRACH resource includes: the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the PRACH resource corresponding to the SSB index and the coverage enhancement level; the coverage enhancement levels are L, wherein the K PRACH resources corresponding to each SSB index are divided into L parts, and each part corresponds to different coverage enhancement levels, and K and L are positive integers greater than or equal to 1.
Optionally, the sending the configuration information of the PRACH resource includes: a mapping relation between PRACH resources and coverage enhancement levels; and Y PRACH resources are shared in each PRACH association pattern period, and the coverage enhancement levels are L, wherein the Y PRACH resources are divided into L parts, and each part corresponds to a different coverage enhancement level.
In a sixth aspect, there is also provided a network-side device, including: a transceiver and a processor; the transceiver is configured to send configuration information of the PRACH resource; and the processor is used for determining the coverage enhancement level corresponding to the terminal according to the received target PRACH resource information.
Optionally, the sending the configuration information of the PRACH resource includes: and sending the mapping relation between the SSB and the PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
Optionally, the sending the configuration information of the PRACH resource includes: the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the PRACH resource corresponding to the SSB index and the coverage enhancement level; the coverage enhancement levels are L, wherein the K PRACH resources corresponding to each SSB index are divided into L parts, and each part corresponds to different coverage enhancement levels, and K and L are positive integers greater than or equal to 1.
Optionally, the sending the configuration information of the PRACH resource includes: a mapping relation between PRACH resources and coverage enhancement levels; and Y PRACH resources are shared in each PRACH association pattern period, and the coverage enhancement levels are L, wherein the Y PRACH resources are divided into L parts, and each part corresponds to a different coverage enhancement level.
In a seventh aspect, there is provided a terminal comprising: the method comprises the steps of a processor, a memory and a processing program which is stored in the memory and can run a PRACH resource configuration method on the processor, wherein the PRACH resource configuration method processing program is executed by the processor to realize the PRACH resource configuration method.
An eighth aspect provides a network-side device, including: the method comprises the steps of a processor, a memory and a processing program which is stored in the memory and can run a PRACH resource configuration method on the processor, wherein the PRACH resource configuration method processing program is executed by the processor to realize the PRACH resource configuration method.
In a ninth aspect, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method for configuring PRACH resources applied to a terminal, or which, when executed by a processor, implements the steps of the method for configuring PRACH resources applied to a network side.
The invention has the beneficial effects that: in the embodiment of the invention, the UE determines the target PRACH resource corresponding to the coverage enhancement level according to the received configuration information of the PRACH resource, and performs random access on the target PRACH resource, so that the network side can know the coverage enhancement level corresponding to the terminal when receiving the target PRACH resource.
Drawings
Fig. 1 is a flow chart of a method for configuring PRACH resources according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of a method for configuring PRACH resources according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a method for configuring PRACH resources according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a method for configuring PRACH resources according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a method for configuring PRACH resources according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a PRACH association pattern period according to an embodiment of the present invention;
fig. 7 is a flow chart of a method for configuring PRACH resources according to an embodiment of the present invention;
fig. 8A and 8B are schematic structural diagrams of a terminal according to an embodiment of the present invention;
fig. 9A and 9B are schematic diagrams of a network side according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a network side structure 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.
Referring to fig. 1, fig. 1 is a flow chart of a method for configuring PRACH resources according to an embodiment of the present invention, where the method for configuring PRACH resources is applied to a terminal, and includes:
step 11: according to the configuration information of PRACH resources, determining target PRACH resources corresponding to the coverage enhancement level of the PRACH resources;
step 12: and carrying out random access on the target PRACH resource.
Optionally, the terminal receives configuration information of PRACH resources sent from the network side device.
Optionally, the configuration information of the PRACH resource is configured by a protocol convention or a network side.
Optionally, the terminal sends the target PRACH resource to the network side to realize cell access.
Through the steps, the terminal performs random access on the target PRACH resource according to PRACH resource information configured by the network side and according to the coverage enhancement level of the terminal, thereby ensuring the coverage of uplink transmission without adding a repeater or other hardware facilities and reducing the cost.
The configuration information of the PRACH resource may be in various manners, and is exemplified below.
Referring to fig. 2, fig. 2 is a schematic diagram of a method for configuring PRACH resources according to an embodiment of the present invention, where the method for configuring PRACH resources is applied to a terminal.
The association mapping relation between PRACH resources and SSB is configured by high-level parameters, and the network configures the number N of SSB associated with each PRACH transmission machine, and the value range is {1/8,1/4,1/2,1,2,4,8, 16}. When N >1, there are multiple SSBs that map to one and the same PRACH transmission opportunity; when n=1, SSB and PRACH transmission opportunities are mapped one-to-one; when N <1, one SSB will map to N consecutive PRACH transmission opportunities.
On this basis, SSBs are mapped sequentially onto all PRACH transmission opportunities of the system configuration according to the following rules. First, SSBs will preferentially associate by number of sequences on one PRACH transmission opportunity. When one or more SSB (N > 1) are associated on one PRACH transmission opportunity, carrying out association mapping on the N SSB in 64 random access sequences in sequence according to the number R of the configured random access sequences, wherein the initial sequence number of the random access sequence associated with the N SSB is n.times.64/N, and the value of N is 0-N-1. Second, SSBs are mapped to PRACH transmission opportunities in ascending frequency-domain relation at the same time-domain location. The SSB will then map PRACH transmission opportunities at different times in one PRACH slot. Finally, SSB will map PRACH transmission opportunities in different PRACH slots.
In the embodiment of the present invention, the configuration information of the PRACH resource includes: and mapping relation between SSB and PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
The mapping relation between the selectable SSB and the PRACH opportunity comprises at least one of the following: the number of SSBs associated with one PRACH opportunity or the number of contention-based sequences corresponding to each SSB in each PRACH opportunity, etc. The PRACH resources include at least one of: PRACH opportunities or PRACH sequences, etc.
Specifically, the mapping relation between the PRACH opportunity and the coverage enhancement level can be obtained through the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the SSB and the coverage enhancement level. Wherein, the mapping relation between the SSB and the coverage enhancement level is as follows: different SSBs correspond to different coverage enhancement levels.
For example: the transmission is repeated for 4 SSBs, SSB0, SSB1, SSB2, and SSB3, respectively, with 2 PRACH opportunities associated with each SSB index. The PRACH opportunity corresponding to SSB0 and the random access sequence in each PRACH opportunity may be used for random access by the user with coverage enhancement level 1, the PRACH opportunity corresponding to SSB1 may be used for random access by the user with coverage enhancement level 2, and so on, the PRACH resources corresponding to different SSBs correspond to different coverage enhancement levels respectively. It should be noted that the coverage enhancement level may be started from 0, and then the PRACH opportunity corresponding to SSB0 and the random access sequence in each PRACH opportunity may be used for the user of the coverage enhancement level 0 to perform random access, and so on.
Referring to fig. 3, fig. 3 is a schematic diagram of a method for configuring PRACH resources according to an embodiment of the present invention, where the method for configuring PRACH resources is applied to a terminal, and in the embodiment of the present invention, configuration information of the PRACH resources includes: the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the PRACH resource corresponding to the SSB index and the coverage enhancement level; the coverage enhancement levels are L, wherein the K PRACH resources corresponding to each SSB index are divided into L parts, and each part corresponds to different coverage enhancement levels, and K and L are positive integers greater than or equal to 1.
Specifically, the mapping relationship between the PRACH resource corresponding to the SSB and the coverage enhancement level is: and dividing the PRACH resources on the PRACH opportunity corresponding to each SSB index according to coverage enhancement levels, wherein each PRACH resource corresponds to different coverage enhancement levels.
For example: the transmission is repeated for 4 SSBs, SSB0, SSB1, SSB2, and SSB3, respectively, with 2 PRACH opportunities associated with each SSB index. The number of the time domain, the frequency domain and the code resources corresponding to the SSB0 is K, the coverage enhancement levels are 4, wherein the number of the PRACH resources corresponding to each SSB index is divided into 4 parts, and each part corresponds to the different coverage enhancement levels.
Optionally, the K PRACH resources corresponding to each SSB index are equally divided into L shares. For example: the K PRACH resources corresponding to SSB0 are equally divided into 4 parts, each coverage class is divided into K/4 resources, and a rounding operation may need to be performed, if the number of the divided resources is not an integer, an upward rounding operation or a downward rounding operation may be performed.
Optionally, the coverage enhancement level is W level, and the corresponding repetition number of PRACH is N W The W-level coverage enhancement corresponds to division K.times.N W /(N 1 +N 2 +…+Nw+……+N L ) The following resources: and the PRACH resources corresponding to the different coverage enhancement levels are more, and the larger the coverage enhancement level is, the more the corresponding PRACH resources are. This is because the larger the coverage enhancement level, the more the number of PRACH repetitions is required, and therefore, a higher coverage enhancement level needs to be allocated more PRACH resources to ensure that the proportion of users in each coverage level is close. For example: the PRACH resources corresponding to the coverage enhancement levels 1-4 may be configured to be K/(1+2+3+4) PRACH resources corresponding to the coverage enhancement level 1, and k×2/(1+2+3+4) PRACH resources corresponding to the coverage enhancement level 2, which may also involve rounding operations. This arrangement ensuresThe number of users of different coverage levels is equal. Of course, if the coverage enhancement level is 0-3, the PRACH sequence repetition number corresponding to the W level of the coverage enhancement level is N W The W-level coverage enhancement corresponds to division K.times.N W /(N 0 +N 1 +…+N w +……+N L-1 ) The specific form of the formula and the resources depend on the numbering of the coverage level, and the essence of the invention is not affected.
Referring to fig. 4, fig. 4 is a schematic diagram of a method for configuring PRACH resources according to an embodiment of the present invention, where the method for configuring PRACH resources is applied to a terminal, and in the embodiment of the present invention, the configuration information of the PRACH resources includes: and mapping relation between SSB and PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
Specifically, the mapping relation between the PRACH opportunity and the coverage enhancement level can be obtained through the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the SSB and the coverage enhancement level. Wherein, the mapping relation between the SSB and the coverage enhancement level is as follows: different SSBs correspond to different coverage enhancement levels.
For example: 4 SSBs are repeatedly sent, SSB0, SSB1, SSB2, and SSB3, respectively, with 1/2 PRACH opportunities associated with each SSB index. The PRACH opportunity corresponding to SSB0 and the random access sequence in each PRACH opportunity may be used for random access by the user with coverage enhancement level 1, the PRACH opportunity corresponding to SSB1 may be used for random access by the user with coverage enhancement level 2, and so on, the PRACH resources corresponding to different SSBs correspond to different coverage enhancement levels respectively. It should be noted that the coverage enhancement level may be started from 0, and then the PRACH opportunity corresponding to SSB0 and the random access sequence in each PRACH opportunity may be used for the user of the coverage enhancement level 0 to perform random access, and so on.
Referring to fig. 5, fig. 5 is a schematic diagram of a method for configuring PRACH resources according to an embodiment of the present invention, where the method for configuring PRACH resources is applied to a terminal, and in the embodiment of the present invention, the configuration information of the PRACH resources includes: and mapping relation between SSB and PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
Specifically, the mapping relation between the PRACH opportunity and the coverage enhancement level can be obtained through the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the SSB and the coverage enhancement level. Wherein, the mapping relation between the SSB and the coverage enhancement level is as follows: different SSBs correspond to different coverage enhancement levels.
For example: 4 SSBs are repeatedly sent, SSB0, SSB1, SSB2, and SSB3, respectively, with 1/2 PRACH opportunities associated with each SSB index. The number of the sequence resources corresponding to the SSB0 is K, the coverage enhancement levels are 4, wherein the number of the sequence resources corresponding to each SSB index is divided into 4 parts, and each part corresponds to a different coverage enhancement level.
Optionally, the K sequence resources corresponding to each SSB index are equally divided into L shares. For example: the K sequence resources corresponding to SSB0 are equally divided into 4 parts, each coverage level is divided into K/4 resources, and a rounding operation may need to be performed, if the number of the divided resources is not an integer, an upward rounding operation or a downward rounding operation may be performed.
Optionally, the coverage enhancement level is W level, and the corresponding repetition number of PRACH is N W The W-level coverage enhancement corresponds to division K.times.N W /(N 1 +N 2 +…+Nw+……+N L ) The following resources: and the PRACH resources corresponding to the different coverage enhancement levels are more, and the larger the coverage enhancement level is, the more the corresponding PRACH resources are. This is because the larger the coverage enhancement level, the more the number of PRACH repetitions is required, and therefore, a higher coverage enhancement level needs to be allocated more PRACH resources to ensure that the proportion of users in each coverage level is close. For example: the PRACH resources corresponding to the coverage enhancement levels 1-4 may be configured to be K/(1+2+3+4) PRACH resources corresponding to the coverage enhancement level 1, and k×2/(1+2+3+4) PRACH resources corresponding to the coverage enhancement level 2, which may also involve rounding operations. This arrangement ensures equal numbers of users of different coverage levels. Of course, if the coverage enhancement level is 0-3, the PRACH sequence repetition number corresponding to the W level of the coverage enhancement level is N W The W level is coveredCover enhancement corresponding to division k×n W /(N 0 +N 1 +…+N w +……+N L-1 ) The specific form of the formula and the resources depend on the numbering of the coverage level, and the essence of the invention is not affected. Another method for configuring PRACH resources according to the embodiment of the present invention, where the configuration information of the PRACH resources includes: a mapping relation between PRACH resources and coverage enhancement levels; and Y PRACH resources are shared in each PRACH association pattern period, the coverage enhancement levels are L, the Y PRACH resources are divided into L parts, and each part corresponds to different coverage enhancement levels.
Optionally, the Y PRACH resources are divided into L shares, each share corresponding to a different coverage enhancement level including: the Y PRACH resources are equally divided into L parts; or the PRACH resources corresponding to the different coverage enhancement levels, the larger the coverage enhancement level is, the more the corresponding PRACH resources are.
Optionally, the Y PRACH resources are all time domain, frequency domain or code domain resources in one PRACH association pattern period.
According to the embodiment of the invention, the terminal receives PRACH resource information configured by the network side, and performs random access on the target PRACH resource according to the coverage enhancement level of the terminal, so that the corresponding relation between the PRACH resource and the coverage enhancement level which are repeatedly transmitted is solved, and the coverage of uplink transmission is ensured.
Referring to fig. 6, fig. 6 is a schematic diagram of a PRACH association pattern period according to an embodiment of the present invention, where the PRACH association pattern period includes one or more association pattern periods, and a mapping relationship between all PRACH repeated transmission opportunities and SSB indexes in each coverage enhancement level is repeated among a plurality of the association pattern periods.
In the prior art, the primary definition of PRACH association pattern period is: the maximum time that the PRACH opportunity and the SSB finish one round of mapping is at least, and the maximum PRACH association pattern period under the original definition is not more than 160ms. In order to shorten the random access delay as much as possible, the association pattern period of SSB and PRACH should be shortened as much as possible, which requires that a sufficient density should be provided as much as possible in the time domain configuration of the random access resources.
Optionally, in an embodiment of the present invention, the PRACH association pattern period is T, where T is less than or equal to N times 160ms, and N is a maximum number of repetitions of PRACH. For example, SSB3 is the largest PRACH, the PRACH resources corresponding to SSB are repeatedly transmitted 8 times, and the largest number of PRACH repetitions is 8, i.e., n=8, and therefore, the association pattern period T of prach=time of PRACH association pattern period under the original definition×8.
Fig. 7 is a flow chart of a method for configuring PRACH resources according to an embodiment of the present invention, where the method for configuring PRACH resources is applied to a network side, and includes:
step 71: transmitting configuration information of PRACH resources;
step 72: and determining the coverage enhancement level corresponding to the terminal according to the received target PRACH resource information.
Optionally, the target PRACH resource information is: target PRACH corresponding to the terminal self enhanced capping level.
Optionally, the network side determines the coverage enhancement level corresponding to the terminal according to the received target PRACH resource information, so that subsequent downlink control information and data information can be sent to the terminal.
Optionally, the sending the configuration information of the PRACH resource includes: and sending the mapping relation between the SSB and the PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
The mapping relation between the selectable SSB and the PRACH opportunity comprises at least one of the following: the number of SSBs associated with one PRACH opportunity or the number of contention-based sequences corresponding to each SSB in each PRACH opportunity, etc. The PRACH resources include at least one of: PRACH opportunities or PRACH sequences, etc.
Optionally, the sending the configuration information of the PRACH resource includes: the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the PRACH resource corresponding to the SSB index and the coverage enhancement level; the coverage enhancement levels are L, wherein the K PRACH resources corresponding to each SSB index are divided into L parts, and each part corresponds to different coverage enhancement levels, and K and L are positive integers greater than or equal to 1.
Optionally, the sending the configuration information of the PRACH resource includes: a mapping relation between PRACH resources and coverage enhancement levels; and Y PRACH resources are shared in each PRACH association pattern period, and the coverage enhancement levels are L, wherein the Y PRACH resources are divided into L parts, and each part corresponds to a different coverage enhancement level.
Optionally, the PRACH association pattern period is T, T is less than or equal to N times 160ms, and N is the maximum number of PRACH repetitions. The PRACH association pattern period comprises one or more association pattern periods, and the mapping relation between all PRACH repeated transmission opportunities and SSB indexes in each coverage enhancement level among a plurality of association pattern periods is repeated.
Through the steps, the network side configures and sends PRACH resource information to the terminal, and determines the coverage enhancement level corresponding to the terminal according to the received target PRACH resource sent by the terminal.
Fig. 8A and fig. 8B are schematic structural diagrams of a terminal according to an embodiment of the present invention. The terminal shown with reference to fig. 8A includes a transceiver 810 and a processor 820.
The transceiver 810 is configured to perform random access on the target PRACH resource;
the processor 820 is configured to determine, according to the configuration information of the PRACH resource, a target PRACH resource corresponding to the self-coverage enhancement level.
Optionally, the configuration information of the PRACH resource includes: and mapping relation between SSB and PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
Optionally, the configuration information of the PRACH resource includes: the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the PRACH resource corresponding to the SSB index and the coverage enhancement level; the coverage enhancement levels are L, wherein the K PRACH resources corresponding to each SSB index are divided into L parts, and each part corresponds to different coverage enhancement levels, and K and L are positive integers greater than or equal to 1.
Optionally, the configuration information of the PRACH resource includes: a mapping relation between PRACH resources and coverage enhancement levels; and Y PRACH resources are shared in each PRACH association pattern period, the coverage enhancement levels are L, the Y PRACH resources are divided into L parts, and each part corresponds to different coverage enhancement levels.
The terminal shown in fig. 8B includes a transceiver module 811 and a processing module 821.
The transceiver module 811 is configured to perform random access on the target PRACH resource;
the processing module 821 is configured to determine, according to the configuration information of the PRACH resource, a target PRACH resource corresponding to the self coverage enhancement level.
Optionally, the configuration information of the PRACH resource includes: and mapping relation between SSB and PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
Optionally, the configuration information of the PRACH resource includes: the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the PRACH resource corresponding to the SSB index and the coverage enhancement level; the coverage enhancement levels are L, wherein the K PRACH resources corresponding to each SSB index are divided into L parts, and each part corresponds to different coverage enhancement levels, and K and L are positive integers greater than or equal to 1.
Optionally, the configuration information of the PRACH resource includes: a mapping relation between PRACH resources and coverage enhancement levels; and Y PRACH resources are shared in each PRACH association pattern period, the coverage enhancement levels are L, the Y PRACH resources are divided into L parts, and each part corresponds to different coverage enhancement levels.
The terminal provided by the embodiment of the invention can realize each process realized by the terminal in the embodiment of the method, and in order to avoid repetition, the description is omitted.
Fig. 9A and fig. 9B are schematic structural diagrams of a network side device according to an embodiment of the present invention.
The network side device shown with reference to fig. 9A includes a transceiver 910 and a processor 920.
The transceiver 910 is configured to send configuration information of the PRACH resource;
the processor 920 is configured to determine, according to the received target PRACH resource information, a coverage enhancement level corresponding to the terminal.
Optionally, the configuration information of the PRACH resource includes: and mapping relation between SSB and PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
Optionally, the configuration information of the PRACH resource includes: the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the PRACH resource corresponding to the SSB index and the coverage enhancement level; the coverage enhancement levels are L, wherein the K PRACH resources corresponding to each SSB index are divided into L parts, and each part corresponds to different coverage enhancement levels, and K and L are positive integers greater than or equal to 1.
Optionally, the configuration information of the PRACH resource includes: a mapping relation between PRACH resources and coverage enhancement levels; and Y PRACH resources are shared in each PRACH association pattern period, the coverage enhancement levels are L, the Y PRACH resources are divided into L parts, and each part corresponds to different coverage enhancement levels.
The network-side device shown in fig. 9B includes a transceiver module 911 and a processing module 921.
The transceiver module 911 is configured to send configuration information of the PRACH resource;
and the processing module 921 is configured to determine, according to the received target PRACH resource information, a coverage enhancement level corresponding to the terminal.
Optionally, the configuration information of the PRACH resource includes: and mapping relation between SSB and PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
Optionally, the configuration information of the PRACH resource includes: the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the PRACH resource corresponding to the SSB index and the coverage enhancement level; the coverage enhancement levels are L, wherein the K PRACH resources corresponding to each SSB index are divided into L parts, and each part corresponds to different coverage enhancement levels, and K and L are positive integers greater than or equal to 1.
Optionally, the configuration information of the PRACH resource includes: a mapping relation between PRACH resources and coverage enhancement levels; and Y PRACH resources are shared in each PRACH association pattern period, the coverage enhancement levels are L, the Y PRACH resources are divided into L parts, and each part corresponds to different coverage enhancement levels.
The network side device provided by the embodiment of the present invention can implement each process implemented by the network side device in the above method embodiment, and in order to avoid repetition, details are not repeated here.
Referring to fig. 10, a schematic diagram of a terminal structure provided in an embodiment of the present invention includes: a processor, a memory, and a processor program for a PRACH resource allocation method stored on the memory and executable on the processor, the processor program for the PRACH resource allocation method being executed by the processor to perform the steps of:
a processor 1010 and a memory 1020. In the embodiment of the invention, the terminal further comprises: a computer program stored in the memory 1020 and executable on the processor 1010, which when executed by the processor 1010 performs the steps of:
and determining the target PRACH resources corresponding to the coverage enhancement level of the PRACH resources according to the configuration information of the PRACH resources.
The processor 1010 is responsible for managing the bus architecture and general processing, and the memory 1020 may store data used by the processor 1010 in performing operations.
The computer program may further implement the following steps when executed by the processor 1010:
optionally, the configuration information of the PRACH resource includes: and mapping relation between SSB and PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
Optionally, the configuration information of the PRACH resource includes: the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the PRACH resource corresponding to the SSB index and the coverage enhancement level; the coverage enhancement levels are L, wherein the K PRACH resources corresponding to each SSB index are divided into L parts, and each part corresponds to different coverage enhancement levels, and K and L are positive integers greater than or equal to 1.
Optionally, the configuration information of the PRACH resource includes: a mapping relation between PRACH resources and coverage enhancement levels; and Y PRACH resources are shared in each PRACH association pattern period, the coverage enhancement levels are L, the Y PRACH resources are divided into L parts, and each part corresponds to different coverage enhancement levels.
Referring to fig. 11, a schematic diagram of a structure of a network side according to an embodiment of the present invention is provided, where the network side includes: a processor, a memory, and a processor program for a PRACH resource allocation method stored on the memory and executable on the processor, the processor program for the PRACH resource allocation method being executed by the processor to perform the steps of:
a processor 1110 and a memory 1120. In the embodiment of the invention, the terminal further comprises: a computer program stored on the memory 1120 and executable on the processor 1110, which when executed by the processor 1110 performs the steps of:
and determining the coverage enhancement level corresponding to the terminal according to the received target PRACH resource information.
The processor 1110 is responsible for managing the bus architecture and general processing, and the memory 1120 may store data used by the processor 1110 in performing operations.
The computer program may further implement the following steps when executed by the processor 1110:
optionally, the configuration information of the PRACH resource includes: and mapping relation between SSB and PRACH opportunity, wherein PRACH resources corresponding to different SSB indexes correspond to PRACH resources of different coverage enhancement levels.
Optionally, the configuration information of the PRACH resource includes: the mapping relation between the SSB and the PRACH opportunity and the mapping relation between the PRACH resource corresponding to the SSB index and the coverage enhancement level; the coverage enhancement levels are L, wherein the K PRACH resources corresponding to each SSB index are divided into L parts, and each part corresponds to different coverage enhancement levels, and K and L are positive integers greater than or equal to 1.
Optionally, the configuration information of the PRACH resource includes: a mapping relation between PRACH resources and coverage enhancement levels; and Y PRACH resources are shared in each PRACH association pattern period, the coverage enhancement levels are L, the Y PRACH resources are divided into L parts, and each part corresponds to different coverage enhancement levels.
The embodiment of the present invention further provides a computer readable storage medium, where a computer program is stored, where the computer program when executed by a processor implements each process of the PRACH resource allocation method embodiment applied to a terminal, or where the computer program when executed by a processor implements each process of the PRACH resource allocation method embodiment applied to a network side, and the same technical effect can be achieved, and for avoiding repetition, details are not repeated herein. Wherein the computer readable storage medium is selected from ROM (Read-Only Memory), RAM (Random Access Memory), magnetic disk or optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.

Claims (13)

1. A method for configuring PRACH resources, applied to a terminal, comprising:
according to the configuration information of PRACH resources, determining target PRACH resources corresponding to the coverage enhancement level of the PRACH resources;
performing random access on target PRACH resources;
the configuration information of the PRACH resource comprises:
a mapping relation between SSB and PRACH opportunity, and a mapping relation between PRACH resource corresponding to SSB index and the coverage enhancement level;
wherein each SSB index corresponds to K PRACH resources, and the coverage enhancement levels are L, where the K PRACH resources corresponding to each SSB index are divided into L shares, and each share corresponds to a different coverage enhancement level, where K and L are positive integers greater than or equal to 1;
or alternatively, the first and second heat exchangers may be,
a mapping relation between PRACH resources and coverage enhancement levels;
and Y PRACH resources are shared in each PRACH association pattern period, the coverage enhancement levels are L, the Y PRACH resources are divided into L parts, and each part corresponds to different coverage enhancement levels.
2. The method of claim 1, wherein K PRACH resources for each SSB index are divided into L shares, each share corresponding to a different coverage enhancement level comprising:
The K PRACH resources corresponding to each SSB index are equally divided into L parts; or alternatively
PRACH resources corresponding to different coverage enhancement levels, the larger the coverage enhancement level is, the more corresponding PRACH resources are.
3. The method of claim 1, wherein the Y PRACH resources are divided into L shares, each share corresponding to a different coverage enhancement level comprising:
the Y PRACH resources are equally divided into L parts;
or, the PRACH resources corresponding to the coverage enhancement levels are different, and the larger the coverage enhancement level is, the more the corresponding PRACH resources are.
4. The method of claim 1, wherein the PRACH association pattern period comprises one or more association pattern periods between which a mapping of all PRACH repetition transmission opportunities to SSB indexes within each coverage enhancement level is repeated.
5. A method for configuring PRACH resources, applied to a network side, comprising:
transmitting configuration information of PRACH resources;
determining a coverage enhancement level corresponding to the terminal according to the received target PRACH resource information;
the configuration information of the PRACH resource comprises:
a mapping relation between SSB and PRACH opportunity, and a mapping relation between PRACH resource corresponding to SSB index and the coverage enhancement level;
Wherein each SSB index corresponds to K PRACH resources, and the coverage enhancement levels are L, where the K PRACH resources corresponding to each SSB index are divided into L shares, and each share corresponds to a different coverage enhancement level, where K and L are positive integers greater than or equal to 1;
or alternatively, the first and second heat exchangers may be,
a mapping relation between PRACH resources and coverage enhancement levels;
and Y PRACH resources are shared in each PRACH association pattern period, the coverage enhancement levels are L, the Y PRACH resources are divided into L parts, and each part corresponds to different coverage enhancement levels.
6. The method of claim 5, wherein the PRACH association pattern period comprises one or more association pattern periods between which the mapping of all PRACH repetition transmission opportunities to SSB indexes within each coverage enhancement level is repeated.
7. A terminal, comprising: a transceiver and a processor;
the transceiver is used for carrying out random access on target PRACH resources;
the processor is used for determining a target PRACH resource corresponding to the coverage enhancement level of the processor according to the configuration information of the PRACH resource;
The configuration information of the PRACH resource comprises:
a mapping relation between SSB and PRACH opportunity, and a mapping relation between PRACH resource corresponding to SSB index and the coverage enhancement level;
wherein each SSB index corresponds to K PRACH resources, and the coverage enhancement levels are L, where the K PRACH resources corresponding to each SSB index are divided into L shares, and each share corresponds to a different coverage enhancement level, where K and L are positive integers greater than or equal to 1;
or alternatively, the first and second heat exchangers may be,
a mapping relation between PRACH resources and coverage enhancement levels;
and Y PRACH resources are shared in each PRACH association pattern period, the coverage enhancement levels are L, the Y PRACH resources are divided into L parts, and each part corresponds to different coverage enhancement levels.
8. A terminal, comprising:
the receiving and transmitting module is used for carrying out random access on target PRACH resources;
the processing module is used for determining target PRACH resources corresponding to the coverage enhancement level of the PRACH resources according to the configuration information of the PRACH resources;
the configuration information of the PRACH resource comprises:
a mapping relation between SSB and PRACH opportunity, and a mapping relation between PRACH resource corresponding to SSB index and the coverage enhancement level;
Wherein each SSB index corresponds to K PRACH resources, and the coverage enhancement levels are L, where the K PRACH resources corresponding to each SSB index are divided into L shares, and each share corresponds to a different coverage enhancement level, where K and L are positive integers greater than or equal to 1;
or alternatively, the first and second heat exchangers may be,
a mapping relation between PRACH resources and coverage enhancement levels;
and Y PRACH resources are shared in each PRACH association pattern period, the coverage enhancement levels are L, the Y PRACH resources are divided into L parts, and each part corresponds to different coverage enhancement levels.
9. A network side device, comprising: a transceiver and a processor;
the transceiver is used for sending configuration information of PRACH resources;
the processor is used for determining a coverage enhancement level corresponding to the terminal according to the received target PRACH resource information;
the configuration information of the PRACH resource comprises:
a mapping relation between SSB and PRACH opportunity, and a mapping relation between PRACH resource corresponding to SSB index and the coverage enhancement level;
wherein each SSB index corresponds to K PRACH resources, and the coverage enhancement levels are L, where the K PRACH resources corresponding to each SSB index are divided into L shares, and each share corresponds to a different coverage enhancement level, where K and L are positive integers greater than or equal to 1;
Or alternatively, the first and second heat exchangers may be,
a mapping relation between PRACH resources and coverage enhancement levels;
and Y PRACH resources are shared in each PRACH association pattern period, the coverage enhancement levels are L, the Y PRACH resources are divided into L parts, and each part corresponds to different coverage enhancement levels.
10. A network side device, comprising:
the receiving and transmitting module is used for transmitting configuration information of PRACH resources;
the processing module determines a coverage enhancement level corresponding to the terminal according to the received target PRACH resource information;
the configuration information of the PRACH resource comprises:
a mapping relation between SSB and PRACH opportunity, and a mapping relation between PRACH resource corresponding to SSB index and the coverage enhancement level;
wherein each SSB index corresponds to K PRACH resources, and the coverage enhancement levels are L, where the K PRACH resources corresponding to each SSB index are divided into L shares, and each share corresponds to a different coverage enhancement level, where K and L are positive integers greater than or equal to 1;
or alternatively, the first and second heat exchangers may be,
a mapping relation between PRACH resources and coverage enhancement levels;
and Y PRACH resources are shared in each PRACH association pattern period, the coverage enhancement levels are L, the Y PRACH resources are divided into L parts, and each part corresponds to different coverage enhancement levels.
11. A terminal, comprising: a processor, a memory and a processing program stored on the memory and operable on the processor to perform the method of configuring PRACH resources, the processing program of configuring PRACH resources, when executed by the processor, implementing the steps of the method of configuring PRACH resources as claimed in any one of claims 1 to 4.
12. A network side device, comprising: processor, memory and a processing program stored on the memory and operable on the processor to perform the method of configuring PRACH resources, the processing program of configuring PRACH resources, when executed by the processor, implementing the steps of the method of configuring PRACH resources as claimed in any one of claims 5 to 6.
13. A computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, the computer program implementing the steps of the method for configuring PRACH resources applied to a terminal according to any one of claims 1 to 4 when being executed by a processor, or the steps of the method for configuring PRACH resources applied to a network side according to any one of claims 5 to 6 when being executed by a processor.
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