CN109152042B - Preamble configuration and identification method, base station, terminal and readable storage medium - Google Patents
Preamble configuration and identification method, base station, terminal and readable storage medium Download PDFInfo
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- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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Abstract
A preamble configuration method, a preamble identification method, a base station, a terminal and a readable storage medium are provided. The configuration method comprises the following steps: configuring preamble configuration information for a terminal, wherein the preamble configuration information comprises: the number of subsets corresponding to available first preamble sequences, identification information of the subsets corresponding to each beam, and the number information of the available first preambles in each of the subsets; the first preamble is a contention preamble or a non-contention preamble; and sending the preamble configuration information to the terminal. By applying the scheme, the UE can be enabled to identify the available preamble sequence range.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a preamble configuration and identification method, a base station, a terminal, and a readable storage medium.
Background
In 5G, a serving cell of a User Equipment (UE) may support multi-beam (beam) operation, each beam having access to the UE. The UE may determine a beam to be accessed by receiving signal quality of a synchronization signal block (SS block) sent by the base station, and further may select a Physical Random Access Channel (PRACH) resource and a preamble (preamble) sequence to be randomly accessed based on Random Access configuration information indicated in a corresponding system message, and send the selected preamble sequence on the selected PRACH resource. The base station may determine a beam accessed by the UE based on the PRACH resource used by the UE and the received preamble sequence, and further transmit data to the UE.
In practical applications, when the UE selects a preamble sequence to be subjected to random access, it needs to identify an available preamble sequence based on the random access configuration information. Since a serving cell of a UE in Long Term Evolution (LTE) is single beam operation, the same information content as random access configuration information in LTE cannot be used to indicate a preamble sequence range available to the UE in 5G, but how a base station indicates an available preamble sequence range in 5G is not solved at present.
Disclosure of Invention
The technical problem solved by the invention is how the base station indicates the available preamble sequence range to the UE in 5G, so that the UE can identify the available preamble sequence.
In order to solve the foregoing technical problem, an embodiment of the present invention provides a preamble configuration method, where the method includes: configuring preamble configuration information for a terminal, wherein the preamble configuration information comprises: the number of subsets corresponding to the available first preamble sequences, identification information of the subsets corresponding to the beams and the number information of the available first preambles in each subset; the first preamble is a contention preamble or a non-contention preamble; and sending the preamble configuration information to the terminal.
Optionally, the first preamble is a contention preamble, and the preamble sequences of each of the subsets are the available contention preamble sequences.
Optionally, the preamble sequence of each of the subsets includes: the available contention preamble sequence and the available non-contention preamble sequence.
Optionally, the preamble configuration information further includes: information of the number of all available preambles in each of said subsets.
The embodiment of the invention also provides a lead code identification method, which comprises the following steps: when preamble configuration information is received, a preset preamble identification mode is adopted to identify a preamble sequence range corresponding to an access beam predetermined by a terminal based on the preamble configuration information; the preamble configuration information includes: the number of subsets corresponding to available first preamble sequences, identification information of the subsets corresponding to each beam, and the number information of the available first preambles in each of the subsets; the first preamble is a contention preamble or a non-contention preamble.
Optionally, the first preamble is a contention preamble, and the preamble sequences of each of the subsets are the available contention preamble sequences.
Optionally, the identifying, by using a preset preamble identification manner, a preamble sequence range corresponding to an access beam predetermined by the terminal includes: and determining a start index and an end index of the subset corresponding to the access beam of the terminal based on the information of the number of the contention preamble sequences in each subset and the number of the subsets.
Optionally, the method further comprises: determining the number of the available non-contention preamble sequences based on the number of the subsets and the information of the number of contention preamble sequences in each of the subsets, and identifying the available non-contention preamble sequences in a reverse order from the end of the preamble sequences available to the terminal.
Optionally, the preamble sequence of each of the subsets includes: the available contention preamble sequence and the available non-contention preamble sequence.
Optionally, the first preamble is a contention preamble; the method for identifying the preamble sequence range corresponding to the access beam predetermined by the terminal by adopting the preset preamble identification mode comprises the following steps: determining a starting index and an ending index of a subset corresponding to an access beam of the terminal based on the quantity information of the competitive lead code sequences in each subset and the number of the subsets; determining the number information of non-contention preamble sequences in the subset corresponding to the access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the number information of contention preamble sequences in the subset corresponding to the access beam of the terminal, identifying the sequence range of the non-contention preamble sequences from the end of the subset corresponding to the access beam of the terminal in a reverse order, and determining the start index and the end index of the non-contention preamble sequences in the subset corresponding to the access beam of the terminal; determining a start index and an end index of a contention preamble in a subset corresponding to an access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and a start index and an end index of a non-contention preamble in the subset corresponding to the access beam of the terminal.
Optionally, the preamble configuration information further includes: information of the number of all available preambles in each of said subsets.
Optionally, the first preamble is a contention preamble; the method for identifying the preamble sequence range corresponding to the access beam predetermined by the terminal by adopting the preset preamble identification mode includes: determining a start index and an end index of a subset corresponding to an access beam of the terminal based on the quantity information of all available lead codes in each subset and the number of subsets corresponding to available competitive lead code sequences; determining the number information of available non-contention preamble codes in the subset corresponding to the access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the number information of available contention preamble codes in the subset corresponding to the access beam of the terminal, identifying the sequence range of the available non-contention preamble codes in reverse order from the end of the subset corresponding to the access beam of the terminal, and determining the start index and the end index of the available non-contention preamble codes in the subset corresponding to the access beam of the terminal; determining a start index and an end index of a non-contention preamble in the subset corresponding to the access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the start index and the end index of the non-contention preamble in the subset corresponding to the access beam of the terminal.
Optionally, the number information of the first preambles available in each of the subsets is: total number of available first preambles in each of the subsets, or ratio of contention preambles to non-contention preambles available in each of the subsets.
An embodiment of the present invention further provides a base station, where the base station includes: a configuration unit adapted to configure preamble configuration information for a terminal, wherein the preamble configuration information includes: the number of subsets corresponding to available first preamble sequences, identification information of the subsets corresponding to each beam, and the number information of the available first preambles in each of the subsets; the first preamble is a contention preamble or a non-contention preamble; a sending unit adapted to send the preamble configuration information to the terminal.
Optionally, the first preamble is a contention preamble, and the preamble sequences of each of the subsets are the available contention preamble sequences.
Optionally, the preamble sequence of each of the subsets includes: the available contention preamble sequence and the available non-contention preamble sequence.
Optionally, the preamble configuration information further includes: information of the number of all available preambles in each of said subsets.
An embodiment of the present invention further provides a terminal, where the terminal includes: a receiving unit adapted to receive preamble configuration information; the preamble configuration information includes: the number of subsets corresponding to available first preamble sequences, identification information of the subsets corresponding to each beam, and the number information of the available first preambles in each of the subsets; the first preamble is a contention preamble or a non-contention preamble; the first identification unit is suitable for identifying a preamble sequence range corresponding to an access beam predetermined by the terminal by adopting a preset preamble identification mode based on the preamble configuration information when the preamble configuration information is received.
Optionally, the first preamble is a contention preamble, and the preamble sequences of each of the subsets are the available contention preamble sequences.
Optionally, the first identifying unit is adapted to determine a start index and an end index of a subset corresponding to an access beam of the terminal according to the information of the number of contention preamble sequences in each subset and the number of the subsets.
Optionally, the terminal further includes: a second identification unit, adapted to determine the number of available non-contention preamble sequences based on the number of subsets and the information of the number of contention preamble sequences in each of the subsets, and identify the range of available non-contention preamble sequences from the end of the range of preamble sequences available to the terminal in reverse order.
Optionally, the preamble sequence of each of the subsets includes: the available contention preamble sequence and the available non-contention preamble sequence.
Optionally, the first preamble is a contention preamble; the first identifying unit is adapted to determine a start index and an end index of a subset corresponding to an access beam of the terminal based on the information of the number of contended preamble sequences in each of the subsets and the number of the subsets; determining the number information of non-contention preamble sequences in the subset corresponding to the access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the number information of the contention preamble sequences in the subset corresponding to the access beam of the terminal, identifying the sequence range of the non-contention preamble in reverse order from the end of the subset corresponding to the access beam of the terminal, and determining the start index and the end index of the non-contention preamble in the subset corresponding to the access beam of the terminal; determining a start index and an end index of a contention preamble code in a subset corresponding to an access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the start index and the end index of a non-contention preamble code in the subset corresponding to the access beam of the terminal.
Optionally, the preamble configuration information further includes: information of the number of all available preambles in each of said subsets.
Optionally, the first preamble is a contention preamble; the first identification unit is adapted to determine a start index and an end index of a subset corresponding to an access beam of the terminal based on the number information of all available preambles in each of the subsets and the number of subsets corresponding to available contention preamble sequences; determining the number information of available non-contention preamble codes in the subset corresponding to the access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the number information of available contention preamble codes in the subset corresponding to the access beam of the terminal, identifying the sequence range of the available non-contention preamble codes in reverse order from the end of the subset corresponding to the access beam of the terminal, and determining the start index and the end index of the available non-contention preamble codes in the subset corresponding to the access beam of the terminal; determining a start index and an end index of a non-contention preamble in the subset corresponding to the access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the start index and the end index of the non-contention preamble in the subset corresponding to the access beam of the terminal.
Optionally, the number information of the available first preambles in each of the subsets is: information of a total number of first preambles available in each of the subsets, or information of a ratio of contention preambles to non-contention preambles available in each of the subsets.
The embodiment of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed, the method for configuring the preamble described above is performed.
The embodiment of the present invention further provides another computer-readable storage medium, on which computer instructions are stored, where the computer instructions are executed to perform any of the above steps of the preamble identification method.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
with the above scheme, the preamble configuration information includes: the number of subsets corresponding to available first preamble sequences, the identification information of the subsets corresponding to each beam, and the number information of the available first preambles in each of the subsets may be further determined based on the preamble configuration information, the number of available first preamble sequences in a preamble sequence range may be determined based on the total number of preamble sequences and the number of available first preamble sequences, the number of another available preamble sequence in the preamble sequence range may be determined based on the total number of preamble sequences and the number of available first preamble sequences, and finally, based on the identification information of the subsets corresponding to each beam, the sequence range of preambles corresponding to beams to which the terminal is to access may be identified.
Drawings
Fig. 1 is a schematic configuration diagram of a preamble in an LTE system;
fig. 2 is a flowchart of a preamble configuration method according to an embodiment of the present invention;
fig. 3 is a flowchart of a preamble identification method according to an embodiment of the present invention;
fig. 4 is a schematic configuration diagram of a preamble in an embodiment of the present invention;
fig. 5 is a schematic diagram of another preamble configuration in the embodiment of the present invention;
fig. 6 is a schematic configuration diagram of a preamble according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a terminal in an embodiment of the present invention.
Detailed Description
In the random access process of the LTE system, after the UE completes cell search, downlink synchronization is achieved, so that downlink data can be transmitted. Then, the UE needs to establish uplink synchronization with the cell through a random access process before uplink data transmission can be performed. The first step of the random access procedure is that the UE transmits a preamble to the base station through the PRACH.
In LTE, there are 64 preamble sequences available per cell, which can be used for contention random access and non-contention random access. The UE may select one of them (or designated by the base station) for transmission on the PRACH.
Referring to fig. 1, in LTE, a base station may indicate an available preamble sequence range to a UE through random access configuration information. Where N1 denotes a preamble sequence range of contention random access available to the cell (referred to as an available contention preamble sequence range), and N2 denotes a preamble sequence range of non-contention random access available to the cell (referred to as an available non-contention preamble sequence range). Wherein N2= (64-N1).
Since the serving cell of the UE is operated in a single beam in LTE, the same information content as the random access configuration information in LTE cannot be used to indicate the available preamble sequence range of the UE in 5G, but how the base station indicates the available preamble sequence range in 5G is not solved at present.
In view of the foregoing problems, an embodiment of the present invention provides a preamble configuration method, where preamble configuration information includes: the number of subsets corresponding to available first preamble sequences, the identification information of the subsets corresponding to each beam, and the number information of the available first preambles in each of the subsets may be further determined based on the preamble configuration information, the number of available first preamble sequences in a preamble sequence range may be determined based on the total number of preamble sequences and the number of available first preamble sequences, the number of another available preamble sequence in the preamble sequence range may be determined based on the total number of preamble sequences and the number of available first preamble sequences, and finally, based on the identification information of the subsets corresponding to each beam, the sequence range of preambles corresponding to beams to which the terminal is to access may be identified.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 2 is a configuration method of a preamble provided in an embodiment of the present invention, where the method specifically includes the following steps:
and step 21, configuring the lead code configuration information for the terminal.
Wherein the preamble configuration information includes: the number of subsets corresponding to available first preamble sequences, identification information of the subsets corresponding to each beam, and the number information of the available first preambles in each of the subsets; the first preamble is a contention preamble or a non-contention preamble.
In a specific implementation, before the terminal sends the preamble sequence to the base station, the base station may configure preamble configuration information for the terminal, and then the terminal may identify, from the preamble configuration information configured by the base station, a preamble sequence range corresponding to a beam to be accessed, and select one preamble sequence from the preamble sequence range to send to the base station, so as to continue a subsequent random access process.
In an embodiment of the present invention, the first preamble may be an available contention preamble or an available non-contention preamble. For convenience and clarity of description, the first preamble is used for unified illustration. It is understood that, in a specific implementation, a person skilled in the art may replace the first preamble in the following embodiments with an available contention preamble, and may also replace the first preamble with an available non-contention preamble.
In the embodiment of the present invention, the first preamble sequence available to the cell may be divided into a plurality of subsets, and how to set each subset is not limited.
In an embodiment of the present invention, the first preamble is a contention preamble, and the available preamble sequences in each subset are the available contention preamble sequences, that is, each subset only includes the available contention preamble sequences.
In the above embodiment, the terminal may determine the start index and the end index of each subset according to the preamble configuration information, and may determine the available non-contention preamble sequence range within the available preamble sequence range of the terminal. The non-contention preamble sequence range is common to all beams. The number of the available first preamble sequences in each of the subsets may be the same or different, and is not limited specifically.
For example, the base station may indicate, in the preamble configuration information, 4 subsets corresponding to the available contention preamble sequences, where the number of the available contention preamble sequences in each subset is 16. Since the total number N of available preamble sequences for a cell is typically fixed, the difference between the total number N of available preamble sequences for a cell and the total number (16 × 4) of available contention preamble sequences in all subsets, i.e., N-16 × 4, is the number of available non-contention preambles for a cell.
In another embodiment of the present invention, each subset may also include both available contention-based preamble sequences and available non-contention-based preamble sequences.
In the case where the number of preamble sequences in each subset is the same, the number of all available preamble sequences in each subset may not be indicated. The terminal can obtain the number of non-contention preamble sequences in each subset based on the total number N of available preamble sequences of the cell, the number of subsets corresponding to the available first preamble sequences, and the number information of the available first preambles in each subset.
For example, the total number of available preamble sequences of the cell is 128, and when the number of subsets corresponding to the available contention preamble sequences is 4, the subsets are respectively subset 1 to subset 4, where the number of contention preamble sequences available in subset 1 is 5, the number of contention preamble sequences available in subset 2 is 4, the number of contention preamble sequences available in subset 3 is 4, and the number of contention preamble sequences available in subset 4 is 5, the number of non-contention preamble sequences available in subset 1 is 128/4-5=27, the number of non-contention preamble sequences available in subset 2 is 128/4-4=28, the number of non-contention preamble sequences available in subset 3 is 128/4-4=28, and the number of non-contention preamble sequences available in subset 4 is 128/4-5= 27.
In the case that the number of preamble sequences in each subset is different, the base station shall indicate the number of subsets corresponding to the available first preamble sequences in the preamble configuration information, and the number information of the available first preambles in each of the subsets, and shall also indicate the number of all available preamble sequences in each of the subsets.
Taking the first preamble as a contention preamble as an example, assuming that the total number of preamble sequences available for a cell is 128, the preamble configuration information includes the following indication information: the number of subsets corresponding to the available contention preamble sequences is 4, and is respectively subset 1 to subset 4, the number of the available contention preamble sequences in subset 1 to subset 4 is 32, 16, 32, and 48, the number of the available contention preamble sequences in subset 1 is 5, the number of the available contention preamble sequences in subset 2 is 4, the number of the available contention preamble sequences in subset 3 is 4, and the number of the available contention preamble sequences in subset 4 is 5.
Based on the preamble configuration information, the terminal may know that the number of available contention-free preamble sequences in the subset 1 is 32-5=27, the number of available contention-free preamble sequences in the subset 2 is 16-4=12, the number of available contention-free preamble sequences in the subset 3 is 32-4=28, and the number of available contention-free preamble sequences in the subset 4 is 48-5= 43.
In specific implementation, whether the number of preamble sequences in each subset is the same or not may be predetermined by a protocol, or may be indicated in the preamble configuration information, and how a specific terminal knows whether the data of the preamble in each subset is the same or not is not limited.
It is to be understood that, in an implementation, when each subset includes both available contention preamble sequences and available non-contention preamble sequences, the base station may also indicate, in the preamble configuration information, the number of subsets corresponding to the available contention preamble sequences and the number information of the available non-contention preambles in each of the subsets. The terminal may determine the number of contention preambles available in each subset based on the above information, which is not illustrated here.
And step 22, sending the preamble configuration information to the terminal.
In a specific implementation, the base station may send the preamble configuration information to the terminal in a plurality of ways, which is not limited specifically. For example, the base station may send the preamble configuration information to the terminal through a system message, or may send the preamble configuration information to the terminal through dedicated signaling.
Since the serving cell of the UE is operated by a single beam in LTE, the UE cannot identify the preamble sequence range in the preamble configuration information by using the same preamble identification method as in LTE, but how the UE identifies the preamble sequence range in the preamble configuration information in 5G is not solved at present.
In view of the foregoing problems, embodiments of the present invention provide a preamble identification method, which can identify an available preamble sequence range by using a preset identification method when receiving the preamble configuration information in the foregoing embodiments.
Specifically, referring to fig. 3, the preamble identification method may include the steps of:
Wherein the preamble configuration information includes: the number of subsets corresponding to available first preamble sequences, identification information of the subsets corresponding to each beam, and the number information of the available first preambles in each of the subsets; the first preamble is a contention preamble or a non-contention preamble.
In an embodiment of the present invention, the first preamble is a non-contention preamble, and all available preamble sequences in each subset are the available contention preamble sequences, that is, each subset only includes available contention preamble sequences.
In a further embodiment of the invention, the preamble sequence of each of said subsets comprises: the available contention preamble sequence and the available non-contention preamble sequence.
In the case where the number of preamble sequences in each subset is the same, the base station may not indicate the number of all available preamble sequences in each subset in the preamble configuration information. The terminal can determine the distribution situation of the available competitive lead codes and the non-competitive lead codes within the range of the available lead code sequences based on the number of the subsets corresponding to the available first lead code sequences and the information of the number of the available first lead codes in each subset.
In the case that the number of preamble sequences in each subset is not exactly the same, the base station shall indicate the number of all available preamble sequences in each subset, in addition to the number of subsets corresponding to the available first preamble sequence and the number information of the available first preamble in each subset, in preamble configuration information. The terminal can determine the distribution of the available contention preambles and the non-contention preambles within the range of the available preamble sequences based on the information.
The preamble configuration information may be implemented specifically with reference to the description of the preamble configuration information in the embodiment shown in fig. 2. And will not be described in detail herein.
And step 32, when the preamble configuration information is received, identifying a preamble sequence range corresponding to an access beam predetermined by the terminal by adopting a preset preamble identification mode based on the preamble configuration information.
In an embodiment of the present invention, when the first preamble is a contention preamble and the preamble sequences of each of the subsets are the available contention preamble sequences, the base station may divide the available non-contention preamble sequences according to a cell level, that is, the contention preamble sequences available to the cell are divided into a plurality of subsets, and the remaining ones of the available contention preamble sequences of the cell are the range of the available non-contention preamble sequences except the available contention preamble sequences.
And the terminal determines the start index and the end index of the subset corresponding to the access beam of the terminal based on the quantity information of the competitive lead code sequences in each subset and the number of the subsets.
In a specific implementation, based on the information of the number of contention preamble sequences in each of the subsets and the number of the subsets, a plurality of methods may be employed to determine a start index and an end index of a subset corresponding to an access beam of a terminal.
For example, referring to fig. 4, taking the total number of the available preamble sequences as N as an example, the number of subsets corresponding to the available contention preamble sequences is x, and the numbers of the available contention preamble sequences in subsets 1 to x are N1 to Nx respectively.
Assuming that the subset corresponding to the access beam of the terminal is subset 2, the terminal may determine the start index of the preamble sequence in subset 2 to be N1 based on the number N1 of the preamble sequences in subset 1, and determine the end index of the preamble sequence in subset 2 to be N1+ y-1 based on the number of the preamble sequences in subset 1, resulting in a range of the preamble sequences in subset 2 to be [ N1, N1+ y-1]. When N1= N2= … … = Nx = y, the preamble sequence range in subset 2 is [ y,2y-1].
In particular implementations, when non-contention random access is required, the terminal should also identify the sequence range of the non-contention preamble from the available preamble sequence range.
Specifically, the terminal may determine the number of available non-contention preamble sequences based on the number of subsets and the information about the number of contention preamble sequences in each of the subsets, and identify the available non-contention preamble sequence range from the end of the preamble sequence range available to the terminal in a reverse order.
For example, referring to fig. 4, the terminal may first obtain the total number of available contention preamble sequences (N1 + N2+ … … + Nx) based on the number of available contention preamble sequences in the subsets 1 to x, further determine the number of all available non-contention preamble sequences = N- (N1 + N2+ … … + Nx) based on the total number of available contention preamble sequences and the total number N of all available preamble sequences, and identify the available non-contention preamble sequences from the end of the range of available preamble sequences of the cell in an inverted manner, to obtain the range of available non-contention preamble sequences [ (N1 + N2+ … … + Nx), N-1]. When N1= N2= … … = Nx = y, the preamble sequence in subset 2 ranges [ x × y, N-1].
In another embodiment of the present invention, when the first preamble is a non-contention preamble and the preamble sequences of each of the subsets are the available non-contention preamble sequences, the terminal sequentially determines the start index and the end index of each subset from the first preamble sequence within the range of the preamble sequences available to the terminal based on the number information of the non-contention preamble sequences in each of the subsets, determines the number of the available contention preamble sequences based on the number of the subsets and the number information of the non-contention preamble sequences in each of the subsets, and identifies the available contention preamble sequence range from the end of the range of the preamble sequences available to the terminal in an inverted manner. Specifically, the method for the terminal to identify the preamble may be implemented when the first preamble is a non-contention preamble and the preamble sequence of each subset is an available non-contention preamble sequence, which is not described herein again.
In another embodiment of the present invention, when the preamble sequences of each of the subsets include both the available contention preamble sequences and the available non-contention preamble sequences, the base station may divide the available first preamble sequences according to the subset level, that is, divide the available first preamble sequences of the cell into a plurality of subsets, and each subset may include both the available contention preamble sequences and the available non-contention preamble sequences.
Taking the first preamble as a contention preamble as an example, when the number of preamble sequences in each subset is the same, determining a start index and an end index of a subset corresponding to an access beam of the terminal based on the number information of the contention preamble sequences in each subset and the number of the subsets.
In a specific implementation, based on the number information of the contention preamble sequences and the number of the subsets in each of the subsets, a plurality of methods may be employed to determine a start index and an end index of a subset corresponding to an access beam of the terminal, further based on the start index and the end index of the subset corresponding to the access beam of the terminal, the number information of the contention preamble sequences available in the subset corresponding to the access beam of the terminal, the number information of the non-contention preambles available in the subset corresponding to the access beam of the terminal is determined, and a sequence range of the available non-contention preambles is identified from the end of the subset corresponding to the access beam of the terminal in an inverted order, the start index and the end index of the non-contention preambles in the subset corresponding to the access beam of the terminal are determined, and finally based on the start index and the end index of the subset corresponding to the access beam of the terminal and the start index and the end index of the non-contention preambles in the subset corresponding to the access beam of the terminal, the start index and the end index and the index of the contention preambles in the subset corresponding to the access beam of the terminal are determined.
For example, referring to fig. 5, when the total number of the available preamble sequences is N, and the number of subsets corresponding to the available contention preamble sequences is x, the number of available preamble sequences in subsets 1 to x is N/x. If the subset corresponding to the access beam of the terminal is the subset x, the terminal may calculate that the total number of preambles in the 1 st to x-1 st subsets is (x-1) N/x, and further determine that the start index of the x-th subset is (x-1) N/x, the end index is N-1, and the corresponding range is [ (x-1) N/x, N-1].
When the available contention preamble sequences in each subset are the same and y, the sequence range of the contention preamble in the xth subset [ (x-1) N/x, (x-1) N/x + y-1], i.e., [ (x-1) N/x, N-N/x + y-1], may be determined based on the start index (x-1) N/x of the xth subset and the number y of contention preambles in the xth subset.
When the contention preamble sequences available in the xth subset are y, the number of non-contention preamble sequences available in the xth subset is N/x-y. Based on the sequence range [ (x-1) N/x, N-N/x + y-1] of the contention preambles in the x-th subset, the start index of the available non-contention preambles in the x-th subset is N-N/x + y, the end index is N-1, and the range of the available non-contention preambles in the x-th subset is [ N-N/x + y, N-1].
In other embodiments of the present invention, when the first preamble is a contention preamble, the number of available non-contention preamble sequences in at least one of the subsets may also be 0. That is, of the subsets corresponding to the available contention preamble sequences, the preamble sequences in at least one subset may all be available contention preamble sequences. At this time, when each of the subsets includes an available contention preamble sequence and a non-contention preamble sequence at the same time, the method for the terminal to identify the preamble sequence may be used for identification, which is not described herein again.
In other embodiments of the present invention, when the first preamble is a non-contention preamble, the number of available contention preamble sequences in at least one of the subsets may also be 0. That is, in the subset corresponding to the available non-contention preamble sequences, the preamble sequences in at least one subset may all be the available non-contention preamble sequences. At this time, when each of the subsets includes both available contention preamble sequences and non-contention preamble sequences, the method for the terminal to identify the preamble sequences may be used for identification, which is not described herein again.
In a specific implementation, when the number of preamble sequences in each subset is not completely the same, the terminal may first determine the start index and the end index of the subset corresponding to the access beam of the terminal based on the number information of all available preambles in each subset and the number of subsets corresponding to available contention preamble sequences, further determine the number information of available contention preamble sequences in the subset corresponding to the access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal, determine the number information of available non-contention preambles in the subset corresponding to the access beam of the terminal, and identify the sequence range of available non-contention preambles from the end of the subset corresponding to the access beam of the terminal in an inverted manner, determine the start index and the end index of the non-contention preambles in the subset corresponding to the access beam of the terminal, and finally determine the start index and the end index of the contention preambles in the subset corresponding to the access beam of the terminal based on the start index and the index of the subset corresponding to the access beam of the terminal and the index and the non-contention preambles in the subset corresponding to the access beam of the terminal.
For example, referring to fig. 6, when the total number of the available preamble sequences is N, the number of subsets corresponding to the available contention preamble sequences is x, and the numbers of the available preamble sequences in the subsets 1 to x are N1 to Nx, respectively, if the subset corresponding to the terminal access beam is the subset 2, the start index of the subset 1 may be determined to be N1 based on the number N1 of the available preambles in the subset 1, and the end index of the subset 2 may be determined to be N1+ N2-1 based on the number N2 of the available preambles in the subset 2, thereby obtaining that the preamble sequence range of the subset 2 is [ N1, N1+ N2-1].
When the number of the contention preamble sequences in the subset 2 is y, the preamble sequence range of the subset 2 is [ N1, N1+ N2-1], it can be obtained that the start index of the contention preamble in the subset 2 is N1, the end index is N1+ y-1, and the sequence range of the contention preamble in the subset 2 is [ N1, N1+ y-1], and further, based on the sequence range of the contention preamble in the subset 2 and the preamble sequence range of the subset 2, it is determined that the start index of the non-contention preamble in the subset 2 is N1+ y, the end index is N1+ N2-1, and the sequence range of the non-contention preamble in the subset 2 is [ N1+ y, N1+ N2-1].
In a specific implementation, when indicating the number of available first preambles in each subset, the base station may directly indicate, in the preamble configuration information, the total number of available first preambles in each subset, or may indicate the ratio of available contention preambles to non-contention preambles in each subset. How to indicate specifically is not limiting.
How to configure the non-contention preamble into a plurality of subsets for the terminal and how the terminal specifically identifies the available preamble sequence range can be implemented with reference to the configuration method and the identification method of dividing the contention preamble into a plurality of subsets, which are not illustrated herein.
The following describes the preamble identification method in the embodiment of the present invention in detail with reference to specific embodiments:
assuming that the base station has 8 beams corresponding to the SS block for transmitting the synchronization signals, the total number of preambles available to the cell is N =128, the first preamble is a contention preamble, and the number of subsets corresponding to the contention preambles available to the cell is 4.
In an embodiment, the available non-contention Preamble sequences for the cell are divided at the cell level (as shown in fig. 4), each subset is configured with 16 available contention preambles, and then the start index of Preamble subset index = (j-1) × 16 for each subset, the start index of the non-contention Preamble sequence is 16 × 4, and the available Preamble index range in each subset is as follows:
Preamble subset index1:[0，15]；
Preamble subset index2：[16，31]；
Preamble subset index3:[32，47]；
Preamble subset index4:[48，63]；
the non-contention preamble range available to the cell is 64, 127.
In another implementation, the sequences of non-contention preambles available to the cell are divided at the cell level, (as shown in fig. 4), and each subset is configured with a different number of contention preambles available, where the number of contention preambles available in subset 1 is 12, the number of contention preambles available in subset 2 is 24, the number of contention preambles available in subset 3 is 48, and the number of contention preambles available in subset 4 is 16.
The beginning index of the jth subset, numberOfRA-Preambles, is represented by Preamble subset indexj j Representing the number of preambles available in the jth subset, the start index of the jth subset is
The last preamble sequence index is
Non-contention preamble sequence start index of
numberOfRA-Preambles j The last preamble sequence index is N-1, whereby the available preamble index range in each subset can be obtained as follows:
Preamble subset index1：[0，11]；
Preamble subset index2：[12，35]；
Preamble subset index3：[36，83]；
Preamble subset index4：[84，99]；
the non-contention preamble range available to the cell is 100, 127.
In yet another embodiment, the available non-contention preambles for the cell are divided at the subset level (as shown in fig. 5), each subset contains available contention preambles and non-contention preambles, and the total number of preambles in each subset is the same, i.e., each subset bisects the preambles available to the cell, thereby resulting in a total number of available preambles in each subset of N/4=128/4=32.
In addition, the number of contention preambles available in each subset of the base station configuration may or may not be the same. Taking the difference as an example, the number of contention preambles available in the subset 1 is 12, the number of contention preambles available in the subset 2 is 24, the number of contention preambles available in the subset 3 is 28, and the number of contention preambles available in the subset 4 is 16.
The beginning index of the jth subset, numberOfRA-Preambles, is represented by Preamble subset indexj j Indicating the number of Preambles available in the jth subset, the start index of the jth subset is (j-1) N/x, and the end preamble sequence index is (j-1) N/x + number of ra-Preambles j -1, non-competing preamble sequence start index of (j-1) × N/x + number OfRA-Preambles j The last preamble sequence index is j × N/x-1, from which the available preamble index range in each subset can be obtained as follows:
subset 1: contention preamble index range [0, 11], non-contention preamble index range [12, 31];
subset 2: contention preamble index range [32, 55], non-contention preamble index range [56, 63];
subset 3: contention preamble index range [64, 91], non-contention preamble index range [92, 95];
subset 4: contention preamble index range [96, 111], non-contention preamble index range [112, 127].
In another embodiment, the non-contention preambles available to the cell are divided at the subset level (as shown in fig. 6), each subset includes contention preambles and non-contention preambles, and the total number of preambles within each subset is different. The base station configures the ratio of the number of available contention preambles to the number of non-contention preambles in each subset to be 3:1 in the preamble configuration information, where the number of available preambles in subset 1 is 24, the number of available preambles in subset 2 is 24, the number of available preambles in subset 3 is 48, and the number of available preambles in subset 4 is 32.
The j-th is represented by Preamble subset indexjStarting index of subset, numberOfRA-Preambles j Representing the number of preambles available in the jth subset, the contention starting preamble index of the jth subset is
Last contention preamble index of
Then, according to the total number of preambles, a non-contention preamble index range can be calculated, and specifically, the available preamble index ranges in each subset can be obtained as follows:
subset 1: contention preamble index range [0, 17], non-contention preamble index range [18, 23];
subset 2: contention preamble index range [24, 41], non-contention preamble index range [42, 47];
subset 3: contention preamble index range [48, 83], non-contention preamble index range [84, 95];
subset 4: contention preamble index range [96, 119], non-contention preamble index range [120, 127].
In a specific implementation, no matter what scheme of the foregoing embodiment is adopted, after the terminal identifies the preamble sequences in the subset corresponding to the access beam, when contention random access is required, one available contention preamble sequence may be selected from the identified available contention preamble sequence range and sent to the base station.
When non-contention random access is required, one available non-contention preamble sequence can be selected from the range of the identified available non-contention preamble sequence and sent to the base station. Of course, when non-contention random access is required, the base station may also designate a terminal to use a certain preamble sequence from the identified available non-contention preamble sequence range to perform a subsequent random access procedure.
As can be seen from the above, the preamble identification method in the embodiment of the present invention identifies the available preamble sequence range by using a corresponding identification method based on the preamble configuration information, so as to better meet the requirement of the random access process in 5G.
In order to make the steps described in the method in the above embodiments more clearly implemented by those skilled in the art, the following describes in detail the apparatus corresponding to the method in the above embodiments:
referring to fig. 7, an embodiment of the present invention provides a base station 70, where the base station 70 may include: a configuration unit 71 and a transmission unit 72. Wherein:
the configuration unit 71 is adapted to configure preamble configuration information for the terminal, where the preamble configuration information includes: the number of subsets corresponding to available first preamble sequences, identification information of the subsets corresponding to each beam, and the number information of the available first preambles in each of the subsets; the first preamble is a contention preamble or a non-contention preamble;
the sending unit 72 is adapted to send the preamble configuration information to the terminal.
In an embodiment of the invention, the first preamble is a contention preamble, and the preamble sequences of each of the subsets are the available contention preamble sequences.
In another embodiment of the present invention, the preamble sequence of each of the subsets comprises: the available contention preamble sequence and the available non-contention preamble sequence.
In an embodiment of the present invention, the preamble configuration information configured by the configuration unit 71 for the terminal includes: the preamble configuration information further includes: information of the number of all available preambles in each of said subsets.
Referring to fig. 8, an embodiment of the present invention further provides a terminal 80, where the terminal 80 may include: a receiving unit 81 and a first identifying unit 82. Wherein:
the receiving unit 81 is adapted to receive preamble configuration information; the preamble configuration information includes: the number of subsets corresponding to available first preamble sequences, identification information of the subsets corresponding to each beam, and the number information of the available first preambles in each of the subsets; the first preamble is a contention preamble or a non-contention preamble;
the first identifying unit 82 is adapted to identify, when preamble configuration information is received, a preamble sequence range corresponding to an access beam predetermined by a terminal by using a preset preamble identification manner based on the preamble configuration information.
In an embodiment of the present invention, the first preamble is a contention preamble, and the preamble sequences of each of the subsets are the available contention preamble sequences.
In an embodiment of the present invention, the first identifying unit is adapted to determine a start index and an end index of a subset corresponding to an access beam of the terminal according to the quantity information of the contention preamble sequences in each subset and the number of the subsets.
In an embodiment of the present invention, the terminal 80 further includes: a second identifying unit (not shown) adapted to determine the number of available non-contention preamble sequences based on the number of subsets and the information of the number of contention preamble sequences in each of the subsets, and identify the range of available non-contention preamble sequences in reverse order from the end of the range of preamble sequences available to the terminal.
In an embodiment of the present invention, the preamble sequence of each of the subsets includes: the available contention preamble sequence and the available non-contention preamble sequence.
In an embodiment of the present invention, the first preamble is a contention preamble; the first identifying unit 82 is adapted to determine a start index and an end index of a subset corresponding to an access beam of the terminal based on the information of the number of contention preamble sequences in each of the subsets and the number of the subsets; determining the number information of non-contention preamble sequences in the subset corresponding to the access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the number information of contention preamble sequences in the subset corresponding to the access beam of the terminal, identifying the sequence range of the non-contention preamble sequences from the end of the subset corresponding to the access beam of the terminal in a reverse order, and determining the start index and the end index of the non-contention preamble sequences in the subset corresponding to the access beam of the terminal; determining a start index and an end index of a contention preamble in a subset corresponding to an access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and a start index and an end index of a non-contention preamble in the subset corresponding to the access beam of the terminal.
In an embodiment of the present invention, the preamble configuration information further includes: information of the number of all available preambles in each of said subsets.
In a specific implementation, the first preamble is a contention preamble; the first identifying unit 82 is adapted to determine a start index and an end index of a subset corresponding to an access beam of the terminal based on the number information of all available preambles in each of the subsets and the number of subsets corresponding to available contention preamble sequences; determining the number information of available non-contention preamble codes in the subset corresponding to the access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the number information of available contention preamble codes in the subset corresponding to the access beam of the terminal, identifying the sequence range of the available non-contention preamble codes in reverse order from the end of the subset corresponding to the access beam of the terminal, and determining the start index and the end index of the available non-contention preamble codes in the subset corresponding to the access beam of the terminal; determining a start index and an end index of a contention preamble in a subset corresponding to an access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the start index and the end index of a non-contention preamble in the subset corresponding to the access beam of the terminal.
In a specific implementation, the number information of the available first preambles in each of the subsets is: total number of available first preambles in each of the subsets, or ratio of contention preambles to non-contention preambles available in each of the subsets.
The embodiment of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, where the computer instructions, when executed, perform the steps of the preamble configuration method.
The embodiment of the present invention further provides another computer-readable storage medium, on which computer instructions are stored, where the computer instructions are executed to perform the steps of the above preamble identification method.
In particular implementations, the computer-readable storage medium may be an optical disk, a mechanical hard disk, a solid state hard disk, and the like.
Specific implementation and beneficial effects of the base station and the terminal in the embodiment of the present invention may refer to the configuration method and the identification method of the preamble in the embodiment of the present invention, which are not described herein again.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.
Claims (28)
1. A method for configuring a preamble, comprising:
configuring preamble configuration information for a terminal, wherein the preamble configuration information comprises: the number of subsets corresponding to available first preamble sequences, identification information of the subsets corresponding to each beam, and the number information of the available first preambles in each of the subsets; the first preamble is a contention preamble or a non-contention preamble;
and sending the preamble configuration information to the terminal.
2. The preamble configuration method of claim 1, wherein the first preamble is a contention preamble, and the preamble sequences of each of the subsets are the available contention preamble sequences.
3. The preamble configuration method according to claim 1, wherein the preamble sequence of each of the subsets comprises: the available contention preamble sequence and the available non-contention preamble sequence.
4. The preamble configuration method according to claim 3, wherein the preamble configuration information further includes: information of the number of all available preambles in each of said subsets.
5. A method for identifying a preamble, comprising:
when preamble configuration information is received, a preset preamble identification mode is adopted to identify a preamble sequence range corresponding to an access beam predetermined by a terminal based on the preamble configuration information; the preamble configuration information includes: the number of subsets corresponding to available first preamble sequences, identification information of the subsets corresponding to each beam, and the number information of the available first preambles in each of the subsets; the first preamble is a contention preamble or a non-contention preamble.
6. The method for identifying preambles of claim 5, wherein the first preamble is a contention preamble, and wherein the preamble sequences of each of the subsets are the available contention preamble sequences.
7. The method for identifying the preamble as claimed in claim 6, wherein the identifying the preamble sequence range corresponding to the access beam predetermined by the terminal by using the preset preamble identification manner comprises:
and determining a start index and an end index of the subset corresponding to the access beam of the terminal based on the information of the number of the contention preamble sequences in each subset and the number of the subsets.
8. The preamble identification method of claim 7, further comprising:
determining the number of the available non-contention preamble sequences based on the number of the subsets and the information of the number of contention preamble sequences in each of the subsets, and identifying the available non-contention preamble sequences in a reverse order from the end of the preamble sequences available to the terminal.
9. The method for identifying preambles of claim 5, wherein the preamble sequences of each of the subsets comprise: the available contention preamble sequence and the available non-contention preamble sequence.
10. The method for identifying the preamble according to claim 9, wherein the first preamble is a contention preamble;
the method for identifying the preamble sequence range corresponding to the access beam predetermined by the terminal by adopting the preset preamble identification mode comprises the following steps:
determining a starting index and an ending index of a subset corresponding to an access beam of the terminal based on the quantity information of the competitive lead code sequences in each subset and the number of the subsets;
determining the number information of non-contention preamble sequences in the subset corresponding to the access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the number information of contention preamble sequences in the subset corresponding to the access beam of the terminal, identifying the sequence range of the non-contention preamble sequences from the end of the subset corresponding to the access beam of the terminal in a reverse order, and determining the start index and the end index of the non-contention preamble sequences in the subset corresponding to the access beam of the terminal;
determining a start index and an end index of a contention preamble in a subset corresponding to an access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and a start index and an end index of a non-contention preamble in the subset corresponding to the access beam of the terminal.
11. The method for identifying the preamble of claim 5, wherein the preamble configuration information further comprises: information of the number of all available preambles in each of said subsets.
12. The method for identifying the preamble of claim 11, wherein the first preamble is a contention preamble;
the method for identifying the preamble sequence range corresponding to the access beam predetermined by the terminal by adopting the preset preamble identification mode comprises the following steps:
determining a start index and an end index of a subset corresponding to an access beam of the terminal based on the quantity information of all available lead codes in each subset and the number of subsets corresponding to available competitive lead code sequences;
determining the number information of available non-contention preamble codes in the subset corresponding to the access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the number information of available contention preamble codes in the subset corresponding to the access beam of the terminal, identifying the sequence range of the available non-contention preamble codes in reverse order from the end of the subset corresponding to the access beam of the terminal, and determining the start index and the end index of the available non-contention preamble codes in the subset corresponding to the access beam of the terminal;
determining a start index and an end index of a contention preamble in a subset corresponding to an access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the start index and the end index of a non-contention preamble in the subset corresponding to the access beam of the terminal.
13. The preamble identification method according to claim 5, wherein the number information of the first preambles available in each of the subsets is: information of a total number of first preambles available in each of the subsets, or information of a ratio of contention preambles to non-contention preambles available in each of the subsets.
14. A base station, comprising:
a configuration unit adapted to configure preamble configuration information for a terminal, wherein the preamble configuration information includes: the number of subsets corresponding to available first preamble sequences, identification information of the subsets corresponding to each beam, and the number information of the available first preambles in each of the subsets; the first preamble is a contention preamble or a non-contention preamble;
a sending unit adapted to send the preamble configuration information to the terminal.
15. The base station of claim 14, wherein the first preamble is a contention preamble, and wherein the preamble sequences of each of the subsets are the available contention preamble sequences.
16. The base station of claim 14, wherein the preamble sequence of each of the subsets comprises: the available contention preamble sequence and the available non-contention preamble sequence.
17. The base station of claim 16, wherein the preamble configuration information further comprises: information of the number of all available preambles in each of said subsets.
18. A terminal, comprising:
a receiving unit adapted to receive preamble configuration information; the preamble configuration information includes: the number of subsets corresponding to available first preamble sequences, identification information of the subsets corresponding to each beam, and the number information of the available first preambles in each of the subsets; the first preamble is a contention preamble or a non-contention preamble;
the first identification unit is suitable for identifying a preamble sequence range corresponding to an access beam predetermined by the terminal by adopting a preset preamble identification mode based on the preamble configuration information when the preamble configuration information is received.
19. The terminal of claim 18, wherein the first preamble is a contention preamble, and wherein the preamble sequences of each of the subsets are the available contention preamble sequences.
20. The terminal of claim 19, wherein the first identifying unit is adapted to determine a start index and an end index of a subset corresponding to an access beam of the terminal according to the information of the number of contention preamble sequences in each of the subsets and the number of the subsets.
21. The terminal of claim 20, further comprising:
a second identification unit, adapted to determine the number of available non-contention preamble sequences based on the number of subsets and the information of the number of contention preamble sequences in each of the subsets, and identify the range of available non-contention preamble sequences from the end of the range of preamble sequences available to the terminal in reverse order.
22. The terminal of claim 18, wherein the preamble sequence of each of the subsets comprises: the available contention preamble sequence and the available non-contention preamble sequence.
23. The terminal of claim 22, wherein the first preamble is a contention preamble; the first identifying unit is adapted to determine a start index and an end index of a subset corresponding to an access beam of the terminal based on the information of the number of contended preamble sequences in each of the subsets and the number of the subsets; determining the number information of non-contention preamble sequences in the subset corresponding to the access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the number information of contention preamble sequences in the subset corresponding to the access beam of the terminal, identifying the sequence range of the non-contention preamble sequences from the end of the subset corresponding to the access beam of the terminal in a reverse order, and determining the start index and the end index of the non-contention preamble sequences in the subset corresponding to the access beam of the terminal; determining a start index and an end index of a contention preamble in a subset corresponding to an access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and a start index and an end index of a non-contention preamble in the subset corresponding to the access beam of the terminal.
24. The terminal of claim 18, wherein the preamble configuration information further comprises: information of the number of all available preambles in each of said subsets.
25. The terminal of claim 24, wherein the first preamble is a contention preamble;
the first identification unit is adapted to determine a start index and an end index of a subset corresponding to an access beam of the terminal based on the number information of all available preambles in each of the subsets and the number of subsets corresponding to available contention preamble sequences; determining the number information of available non-contention preamble codes in the subset corresponding to the access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the number information of available contention preamble codes in the subset corresponding to the access beam of the terminal, identifying the sequence range of the available non-contention preamble codes in reverse order from the end of the subset corresponding to the access beam of the terminal, and determining the start index and the end index of the available non-contention preamble codes in the subset corresponding to the access beam of the terminal; determining a start index and an end index of a non-contention preamble in the subset corresponding to the access beam of the terminal based on the start index and the end index of the subset corresponding to the access beam of the terminal and the start index and the end index of the non-contention preamble in the subset corresponding to the access beam of the terminal.
26. The terminal of claim 18, wherein the information on the number of first preambles available in each of the subsets is: total number of available first preambles in each of the subsets, or ratio of contention preambles to non-contention preambles available in each of the subsets.
27. A computer readable storage medium having stored thereon computer instructions, wherein the computer instructions are executable by a processor to implement the steps of the preamble configuration method of any one of claims 1 to 4.
28. A computer readable storage medium having stored thereon computer instructions, wherein the computer instructions are executable by a processor to perform the steps of the preamble identification method of any one of claims 5 to 13.
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| CN111629445B (en) * | 2019-02-27 | 2022-07-29 | 华为技术有限公司 | Random access method and device |
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