CN107333283B - Random access detection method and device - Google Patents

Random access detection method and device Download PDF

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CN107333283B
CN107333283B CN201710419280.3A CN201710419280A CN107333283B CN 107333283 B CN107333283 B CN 107333283B CN 201710419280 A CN201710419280 A CN 201710419280A CN 107333283 B CN107333283 B CN 107333283B
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value
preset threshold
access
threshold value
signal
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CN107333283A (en
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付杰尉
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Comba Network Systems Co Ltd
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Comba Telecom Systems China Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic

Abstract

The application discloses a random access detection method and a device, wherein the method part comprises the following steps: the network equipment determines the access number of terminals currently performing random access according to the received Physical Random Access Channel (PRACH) signal; the network equipment determines a preset threshold value corresponding to the access quantity; and the network equipment detects the PRACH signal according to the preset threshold value.

Description

Random access detection method and device
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a random access detection method and apparatus.
Background
In a Long Term Evolution (LTE) system, a terminal performs uplink Random Access using a Physical Random Access Channel (PRACH) to establish an uplink with each cell. In the LTE system, a terminal can be scheduled for uplink transmission only after time synchronization of an uplink channel is completed. In the initial synchronization process, the terminal sends a preamble sequence on the PRACH, the base station determines the timing adjustment amount of uplink synchronization of the terminal after receiving the preamble sequence and sends it to the terminal, and the terminal adjusts the uplink data transmission time according to the issued timing adjustment amount, thereby implementing time synchronization of the uplink channel, which is generally called as a random access process.
In the LTE protocol of the third Generation Partnership Project (3 GPP), there are 64 preambles available in each cell in the LTE system, and a terminal randomly selects one of the 64 preamble sequences to initiate random access. The base station needs to detect the received preamble sequence and determine whether there is a terminal access.
The following two methods are generally adopted in the prior art for PRACH detection.
1) Presetting a fixed power threshold value, then calculating the power in the search window, if the calculated power is greater than the power threshold value, determining that a terminal is accessed, otherwise, determining that no terminal is accessed. The method only sets a fixed threshold, 2) a fixed Signal-to-Noise Ratio (SNR) threshold value is preset, then the SNR in a search window is calculated, if the calculated SNR is larger than the threshold SNR value, it is determined that a terminal is accessed, otherwise, no terminal is accessed.
In the method, the threshold is set as a fixed value, so that the index requirements of missed detection and false detection are difficult to meet, and particularly, when multiple terminals are accessed, the missed detection and the false detection can occur due to the existence of interference between the terminals.
Disclosure of Invention
The application provides a random access detection method and a random access detection device, which are used for solving the problems of missed detection, false detection and the like caused by the existence of interference between terminals when multiple terminals are accessed in the prior art.
The application provides a random access detection method, which comprises the following steps:
the network equipment determines the access number of terminals currently performing random access according to a received Physical Random Access Channel (PRACH) signal, and determines a preset threshold value corresponding to the access number.
And the network equipment detects the PRACH signal according to the preset threshold value.
According to the method provided by the embodiment of the application, after the network equipment determines the access number of the terminals which are currently subjected to random access, the preset threshold value corresponding to the access number is determined, and then the PRACH signal is detected again according to the preset threshold value, so that whether the terminals are accessed in each search window of the PRACH signal can be determined according to the preset threshold value, and the conditions of missed detection, false detection and the like caused by the existence of interference among the terminals are further avoided when multiple terminals are accessed.
The network equipment determines the access number of terminals currently performing random access according to the received Physical Random Access Channel (PRACH) signal;
the network equipment determines a preset threshold value corresponding to the access quantity;
and the network equipment detects the PRACH signal according to the preset threshold value.
Optionally, the detecting, by the network device, the PRACH signal according to the preset threshold value includes:
the network equipment determines a search window with target parameter values larger than the preset threshold value in all search windows of the PRACH signal as a search window with terminal access, and determines a search window with target parameter values smaller than or equal to the preset threshold value in all search windows as a search window without terminal access; the target parameter value is a signal-to-noise ratio (SNR) value or a useful signal power value.
Optionally, the detecting, by the network device, the PRACH signal according to the preset threshold value includes:
the network equipment determines a search window with a target parameter value larger than a weighted preset threshold value in all search windows of the PRACH signal as a search window with terminal access, and determines a search window with a target parameter value smaller than or equal to the weighted preset threshold value in all search windows as a search window without terminal access; the target parameter value is a signal-to-noise ratio (SNR) value or a useful signal power value; the weighted preset threshold is a product of the preset threshold and a power average value of a power spectrum of the PRACH signal.
Optionally, the preset threshold value is a preset signal-to-noise ratio SNR value; or the preset threshold value is the useful signal power value.
The application provides a random access detection device, includes:
a first determining unit, configured to determine, according to a received physical random access channel PRACH signal, an access number of terminals currently performing random access;
a second determining unit, configured to determine a preset threshold corresponding to the access number; and detecting the PRACH signal according to the preset threshold value.
Optionally, the second determining unit is specifically configured to:
determining search windows with target parameter values larger than the preset threshold value in all search windows of the PRACH signal as search windows with terminal access, and determining search windows with target parameter values smaller than or equal to the preset threshold value in all search windows as search windows without terminal access; the target parameter value is a signal-to-noise ratio (SNR) value or a useful signal power value.
Optionally, the second determining unit is specifically configured to:
determining search windows with target parameter values larger than a weighted preset threshold value in all search windows of the PRACH signal as search windows with terminal access, and determining search windows with target parameter values smaller than or equal to the weighted preset threshold value in all search windows as search windows without terminal access; the target parameter value is a signal-to-noise ratio (SNR) value or a useful signal power value; the weighted preset threshold is a product of the preset threshold and a power average value of a power spectrum of the PRACH signal.
Optionally, the preset threshold value is a preset signal-to-noise ratio SNR value; or the preset threshold value is the useful signal power value.
Embodiments of the present application provide a computer-readable storage medium having stored therein instructions, which when executed on a computer, cause the computer to perform the method of the above aspects.
The present application provides a computer program product containing instructions which, when run on a computer, cause the computer to perform the method of the above aspects.
Drawings
Fig. 1 is a schematic flow chart of a random access detection method according to an embodiment of the present application;
fig. 2 is a schematic diagram of a time-domain power spectrum provided in an embodiment of the present application;
fig. 3 is a schematic diagram of a time-domain power spectrum provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a random access detection apparatus according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings.
The embodiment of the application can be applied to various mobile communication systems, such as: new Radio (NR) systems, Global System of Mobile communication (GSM) systems, Code Division Multiple Access (CDMA) systems, Wideband Code Division Multiple Access (WCDMA) systems, General Packet Radio Service (GPRS), Long Term Evolution (LTE) systems, Advanced Long Term Evolution (LTE-a) systems, Universal Mobile Telecommunications System (UMTS), evolved Long Term Evolution (LTE) systems, and other Mobile communication systems such as 5G.
Hereinafter, some terms in the present application are explained to facilitate understanding by those skilled in the art.
1) A terminal, which may also be referred to as a User Equipment (UE), is a device that provides voice and/or data connectivity to a User, for example, a handheld device with a wireless connection function, a vehicle-mounted device, and so on. Common terminals include, for example: the mobile phone includes a mobile phone, a tablet computer, a notebook computer, a palm computer, a Mobile Internet Device (MID), and a wearable device such as a smart watch, a smart bracelet, a pedometer, and the like.
2) The network device may be a common base station (e.g., a Node B or an eNB), may be a new radio controller (NR controller), may be a gNode B (gNB) in a 5G system, may be a Centralized network element (Centralized Unit), may be a new wireless base station, may be a radio remote module, may be a macro base station, may be a micro base station, may be a relay (relay), may be a Distributed network element (Distributed Unit), may be a Reception Point (TRP) or a Transmission Point (TP), or any other wireless access device, but the embodiment of the present invention is not limited thereto.
3) "plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. Meanwhile, it should be understood that although the terms first, second, third, etc. may be used to describe various messages, requests and terminals in the embodiments of the present application, these messages, requests and terminals should not be limited to these terms, such as first terminal, second terminal, etc. These terms are only used to distinguish one message, request, and terminal from another and do not denote any order or importance to the message, request, and terminal.
Referring to fig. 1, a flowchart of a random access detection method provided in an embodiment of the present application is shown. The method comprises the following steps:
step 101: the network equipment determines the access number of the terminals which are currently subjected to random access according to the received physical random access channel PRACH signal.
Step 102: and the network equipment determines a preset threshold value corresponding to the access quantity.
Step 103: and the network equipment detects the PRACH signal according to the preset threshold value.
In step 101, the network device may first determine a time domain power spectrum obtained by correlating the PRACH signal with each local root sequence, and then determine whether a terminal accesses in each search window of the PRACH signal according to the time domain power spectrum obtained by correlating the PRACH signal with each local root sequence, so as to obtain the access number.
For example, suppose PDPr(n) is the time domain power spectrum obtained after the PRACH signal is correlated with the r local root sequence, and the PDP is carried outr(n) dividing the search windows, judging access in each search window, and if the search window has a mean (PDP) value greater than thatr(n)) + α point, it is determined that there is a terminal access to it in the search window, mean (PDP)r(n)) is PDPrThe mean of (n), α, is the threshold adjustment factor.
It should be noted that, the number of search windows and the size of the search windows are predefined by a protocol according to parameters selected by a network device, and the embodiment of the present application is not limited thereto.
In the above steps, the access number determined by the network device is the number of the terminals currently performing random access, which is preliminarily estimated, and the access number may need to be corrected subsequently, so as to more accurately determine the number of the terminals currently performing random access.
Optionally, in this embodiment of the present application, the network device may obtain a time domain power spectrum of the PRACH signal in the following manner:
the method comprises the following steps: the network equipment firstly correlates the received PRACH signal with a local root sequence to obtain a PRACH channel estimation value.
If a plurality of local root sequences exist, the received PRACH signal needs to be correlated with each local root sequence, so as to obtain a plurality of PRACH channel estimation values.
Step two: and the network equipment fills the zero of the obtained PRACH channel estimation value to 1024 points, and then converts the PRACH channel estimation value into a time domain to obtain a time domain power spectrum. For example, if the PRACH is format4, the frequency domain channel estimate may have only 139 points, and requires 885 zeros at the end; if the PRACH is format 0-format 3, the frequency domain channel estimation value is only 839 points, and 185 zeros need to be complemented at the end.
For example, assume PRACH of format0, NCS59, 5 root sequences are required to generate 64 preamble sequences. Fig. 2 is a schematic diagram of a time-domain power spectrum provided in the embodiment of the present application. Fig. 2 is a time domain power spectrum obtained by a network device correlating a received PRACH signal with a local root sequence when a terminal randomly accesses the network device. For another example, as shown in fig. 3, a schematic diagram of a time domain power spectrum provided for the embodiment of the present application is provided. Fig. 3 is a time domain power spectrum obtained by a network device correlating a received PRACH signal with a first root sequence when 10 terminals randomly access, where the 10 terminals are uniformly distributed under 5 root sequences, that is, 2 terminals access under each root.
In step 102, the network device may pre-establish a correspondence between the number of terminals and a preset threshold, and after acquiring the access number, the network device may determine the preset threshold corresponding to the access number.
In the embodiment of the present application, the preset threshold may be an SNR value, a useful signal power value, or a threshold related to a signal peak value. Meanwhile, the corresponding relationship between the number of the terminals and the preset threshold value may have various forms, which is not limited in the embodiment of the present application. For example, when the number of the terminals is less than 5, the first preset threshold value is corresponded to, when the number of the terminals is greater than or equal to 5 and less than 10, the second preset threshold value is corresponded to, and so on.
When a plurality of terminals access, especially when a plurality of root sequences exist, and the accessed terminals select different root sequences, the terminals distributed under different root sequences interfere with each other due to non-orthogonality among different root sequences, the number of the access terminals is different under the same noise, and the calculated SNR difference is also very large. Therefore, in the embodiment of the present application, when the number of the accessed terminals is larger, the corresponding preset threshold value may be smaller.
In conjunction with fig. 2 and 3, it can be seen that the noise in fig. 2 is much less than that in fig. 3 (the PRACH signal in fig. 2 and 3 is received under the same noise, and below the dashed line in fig. 2 and 3 is noise); this is because the sequences generated by different roots are not orthogonal, so the remaining 4 terminals are noise for the current root terminal, and thus the calculated SNR for 10 terminal users in fig. 3 is much smaller than the SNR generated for one terminal user in fig. 2.
For example, assuming that the maximum number of access terminals for PRACH in an application scenario is less than 20, 4 groups of preset threshold values may be set, and the specific correspondence may be as follows:
if the number of terminals is NumUE, then
If NumUE<5, the corresponding preset threshold th1 may be β1；
If NumUE is greater than or equal to 5 and less than or equal to 10, the corresponding preset threshold value th1 may be β2；
If 10<NumUE is less than or equal to 15, and the corresponding preset threshold value th1 can be β3；
If 15<NumUE is less than or equal to 20, and the corresponding preset threshold value th1 can be β4。
Wherein, β1，β2，β3，β4There may be a relationship of β1>β2>β3>β4And β1，β2，β3，β4Has a value range of [0,10 ]]。
Where th1 may be a threshold value related to SNR, or a threshold value related to power of the desired signal, or a threshold value related to power factor of the desired signal, or a threshold value related to peak value of the signal, or a threshold value related to peak factor of the signal.
Finally, in step 103, the network device performs re-detection in all search windows of the PRACH signal according to the preset threshold value, and finally determines whether there is terminal access in each search window, and determines the number of terminal accesses obtained by detection as the final number of terminals currently performing random access.
Specifically, the network device may compare the preset threshold value with a target parameter value of each search window in all search windows of the PRACH signal, so as to determine whether there is a terminal access in each search window. The target parameter value is an SNR value or a useful signal power value.
In a possible implementation manner, the network device may determine, as a search window in which a terminal accesses, a search window in which a target parameter value in all search windows of the PRACH signal is greater than the preset threshold value, and determine, as a search window in which a terminal accesses, a search window in which a target parameter value in all search windows is less than or equal to the preset threshold value; the target parameter value is a signal-to-noise ratio (SNR) value or a useful signal power value.
For example, if the predetermined threshold is an SNR value, an SNR value in each search window of the PRACH signal is calculated. If the SNR value of one search window is larger than the search window with the preset threshold value, the fact that a terminal is accessed in the search window can be determined, otherwise, no terminal is accessed.
In another possible implementation manner, the network device determines, as a search window in which a terminal accesses, a search window in which a target parameter value in all search windows of the PRACH signal is greater than a weighted preset threshold value, and determines, as a search window in which a terminal accesses, a search window in which a target parameter value in all search windows is less than or equal to the weighted preset threshold value; the target parameter value is an SNR value or a useful signal power value; the weighted preset threshold is a product of the preset threshold and a power average value of a power spectrum of the PRACH signal.
For example, if the preset threshold is a useful signal power value, a useful signal power value in each search window of the PRACH signal is calculated, and if the useful signal power of one search window is greater than the preset threshold, it may be determined that there is a terminal access in the search window, otherwise, there is no terminal access. Or, if the preset Threshold is the useful signal power value, calculating the useful signal power value in each search window of the PRACH signal, and if the useful signal power value of one search window is greater than the weighted preset Threshold value Threshold1Then it can be determined that there is terminal access in the search window, otherwise it can be determined that there is no terminal access in the search window, wherein Threshold1＝mean(PDPr(n)). th1, th1 are preset threshold values.
For another example, if the preset threshold is a signal peak, a signal peak in each search window of the PRACH signal is searched, if the signal peak of one search window is greater than the preset threshold, a terminal accesses in the search window, otherwise, no terminal accesses. Or, if the preset Threshold is the signal peak coefficient, searching the signal peak in each search window of the PRACH signal, and if the signal peak of one search window is greater than the weighted preset Threshold1Then it can be determined that there is terminal access in the search window, otherwise it can be determined that there is no terminal access in the search window, wherein Threshold1＝mean(PDPr(n)). th1, th1 are preset threshold values.
Based on the same technical concept, the embodiment of the present application further provides a random access detection device, which can execute the above method embodiments.
As shown in fig. 4, a schematic structural diagram of a random access detection apparatus 1500 is provided for an embodiment of the present application. The apparatus 400 may be a network device or the like.
Referring to fig. 4, the apparatus 400 includes:
a first determining unit 401, configured to determine, according to a received physical random access channel PRACH signal, an access number of terminals currently performing random access;
a second determining unit 402, configured to determine a preset threshold corresponding to the access number; and detecting the PRACH signal according to the preset threshold value.
Optionally, the second determining unit 402 is specifically configured to:
determining search windows with target parameter values larger than the preset threshold value in all search windows of the PRACH signal as search windows with terminal access, and determining search windows with target parameter values smaller than or equal to the preset threshold value in all search windows as search windows without terminal access; the target parameter value is a signal-to-noise ratio (SNR) value or a useful signal power value.
Optionally, the second determining unit 402 is specifically configured to:
determining search windows with target parameter values larger than a weighted preset threshold value in all search windows of the PRACH signal as search windows with terminal access, and determining search windows with target parameter values smaller than or equal to the weighted preset threshold value in all search windows as search windows without terminal access; the target parameter value is a signal-to-noise ratio (SNR) value or a useful signal power value; the weighted preset threshold is a product of the preset threshold and a power average value of a power spectrum of the PRACH signal.
Optionally, the preset threshold value is a preset signal-to-noise ratio SNR value; or the preset threshold value is the useful signal power value.
The embodiment of the present application further provides a computer-readable storage medium, which is used for storing computer software instructions required to be executed for executing the processor, and which contains a program required to be executed for executing the processor.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (6)

1. A method for random access detection, the method comprising:
the network equipment determines a time domain power spectrum obtained after the correlation between the received physical random access channel PRACH signal and each local root sequence; determining an access terminal in each search window in all search windows of the PRACH signal according to the time domain power spectrum; determining the access number of the access terminals according to the access terminals; the network equipment determines a preset threshold value corresponding to the access quantity;
the network equipment determines a search window with target parameter values larger than the preset threshold value in all search windows of the PRACH signal as a search window with terminal access, and determines a search window with target parameter values smaller than or equal to the preset threshold value in all search windows as a search window without terminal access; the target parameter value is a signal-to-noise ratio (SNR) value or a useful signal power value.
2. The method of claim 1, wherein the detecting, by the network device, the PRACH signal according to the preset threshold value comprises:
the network equipment determines a search window with a target parameter value larger than a weighted preset threshold value in all search windows of the PRACH signal as a search window with terminal access, and determines a search window with a target parameter value smaller than or equal to the weighted preset threshold value in all search windows as a search window without terminal access; the target parameter value is a signal-to-noise ratio (SNR) value or a useful signal power value; the weighted preset threshold is a product of the preset threshold and a power average value of a power spectrum of the PRACH signal.
3. The method according to any one of claims 1 to 2, wherein the predetermined threshold value is a predetermined signal-to-noise ratio, SNR, value; or the preset threshold value is the useful signal power value.
4. A random access detection apparatus, comprising:
the first determining unit is used for determining a time domain power spectrum obtained after the correlation between the received physical random access channel PRACH signal and each local root sequence is carried out; determining an access terminal in each search window in all search windows of the PRACH signal according to the time domain power spectrum; determining the access number of the access terminals according to the access terminals;
a second determining unit, configured to determine a preset threshold corresponding to the access number; the search windows used for determining the search windows with the target parameter values larger than the preset threshold value in all the search windows of the PRACH signal as the search windows with terminal access, and determining the search windows with the target parameter values smaller than or equal to the preset threshold value in all the search windows as the search windows without terminal access; the target parameter value is a signal-to-noise ratio (SNR) value or a useful signal power value.
5. The apparatus according to claim 4, wherein the second determining unit is specifically configured to:
determining search windows with target parameter values larger than a weighted preset threshold value in all search windows of the PRACH signal as search windows with terminal access, and determining search windows with target parameter values smaller than or equal to the weighted preset threshold value in all search windows as search windows without terminal access; the target parameter value is a signal-to-noise ratio (SNR) value or a useful signal power value; the weighted preset threshold is a product of the preset threshold and a power average value of a power spectrum of the PRACH signal.
6. The apparatus according to any one of claims 4 to 5, wherein the predetermined threshold value is a predetermined SNR value; or the preset threshold value is the useful signal power value.
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