CN116528390A - Equipment access method, terminal equipment, base station, system and electronic equipment - Google Patents

Equipment access method, terminal equipment, base station, system and electronic equipment Download PDF

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Publication number
CN116528390A
CN116528390A CN202310525625.9A CN202310525625A CN116528390A CN 116528390 A CN116528390 A CN 116528390A CN 202310525625 A CN202310525625 A CN 202310525625A CN 116528390 A CN116528390 A CN 116528390A
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China
Prior art keywords
preamble
sequence
base station
lead code
initial
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CN202310525625.9A
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Chinese (zh)
Inventor
李立华
王秋实
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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Priority to CN202310525625.9A priority Critical patent/CN116528390A/en
Publication of CN116528390A publication Critical patent/CN116528390A/en
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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
    • H04W74/0841—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment
    • H04W74/0858—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure with collision treatment collision detection
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention provides a device access method, terminal equipment, a base station, a system and electronic equipment, wherein the method comprises the following steps: the terminal equipment determines an initial preamble according to the preamble sequence and a conjugate sequence corresponding to the preamble sequence; responding to a label mapping instruction, and determining a label lead code corresponding to the initial lead code according to the initial lead code and the lead index number, wherein the root serial number of the initial lead code corresponds to the lead index number one by one; transmitting a tag preamble to a base station; the base station receives a label lead code sent by the terminal equipment; performing conflict detection on the tag preamble to obtain a conflict result; transmitting a conflict result to the terminal equipment; the terminal equipment receives the conflict result sent by the base station and determines an access result according to the conflict result. According to the method, a label lead code corresponding to an initial lead code is generated according to the one-to-one correspondence between the root serial number of the initial lead code and the lead index number, so that a base station can accurately detect the conflict of the label lead code, and the conflict false detection rate is reduced.

Description

Equipment access method, terminal equipment, base station, system and electronic equipment
Technical Field
The present invention relates to the field of data processing technologies, and in particular, to a device access method, a terminal device, a base station, a system, and an electronic device.
Background
With rapid development of technology, terminal devices are becoming more popular. When a user uses a terminal device, the terminal device needs to be accessed to a base station, and in the access process, the terminal device always sends a preamble to the base station so that the base station can perform conflict detection on the preamble, and the terminal device is allowed to be accessed under the condition that the preamble is determined not to be in conflict.
However, the collision detection link in the existing device access method has a high false detection rate. Therefore, how to reduce the collision false detection rate in the collision detection link becomes a problem to be solved.
Disclosure of Invention
The invention provides a device access method, terminal equipment, a base station, a system and electronic equipment, which are used for solving the defect that a high false detection rate exists in a collision detection link in the existing device access method, and generating a tag preamble corresponding to an initial preamble according to the one-to-one correspondence between a root serial number of the initial preamble and the preamble index number so as to prepare the base station for more accurately detecting the tag preamble, thereby reducing the collision false detection rate and improving the effective access quantity of the terminal equipment.
In a first aspect, the present invention provides a device access method, applied to a terminal device, where the method includes:
determining an initial preamble according to the preamble sequence and a conjugate sequence corresponding to the preamble sequence;
responding to a label mapping instruction, and determining a label lead code corresponding to the initial lead code according to the initial lead code and the lead index number, wherein the root serial number of the initial lead code corresponds to the lead index number one by one;
the label lead code is sent to a base station, and is used for carrying out conflict detection by the base station to obtain a conflict result;
and receiving the conflict result sent by the base station, and determining an access result according to the conflict result.
According to the device access method provided by the invention, the initial preamble is determined according to the preamble sequence and the conjugate sequence corresponding to the preamble sequence, and the method comprises the following steps: superposing the preamble sequence and a conjugate sequence corresponding to the preamble sequence to obtain the initial preamble; wherein the sum of the number of the root sequence numbers of the preamble sequence and the number of the root sequence numbers of the conjugate sequence is the same as the sequence length of the initial preamble.
According to the device access method provided by the invention, the label lead code corresponding to the initial lead code is determined according to the initial lead code and the lead index number, and the method comprises the following steps: obtaining a root sequence number of the label lead code corresponding to the initial lead code according to a mapping formula; determining the tag preamble according to the root sequence number of the tag preamble; wherein, the mapping formula is: k (k) i =f (i), k+.r and k+.u; i represents the leading index number; k (k) i A root sequence number representing the tag preamble; f (i) represents a mapping function corresponding to the preamble index number i; k represents the root sequence number set of the tag preamble, K i E, K; r represents the root sequence number set of the preamble sequence in the initial preamble; u denotes the set of root sequence numbers of the co-sequence in the initial preamble.
In a second aspect, the present invention provides a device access method, applied to a base station, where the method includes:
receiving a label lead code sent by terminal equipment, wherein the label lead code is obtained by the terminal equipment according to an initial lead code and a lead index number, a root serial number of the initial lead code corresponds to the lead index number one by one, and the initial lead code is determined according to a lead sequence and a conjugate sequence corresponding to the lead sequence;
performing conflict detection on the label lead code to obtain a conflict result;
and sending the conflict result to the terminal equipment, wherein the conflict result is used for determining an access result by the terminal equipment.
According to the device access method provided by the invention, the conflict detection is carried out on the tag lead code to obtain a conflict result, which comprises the following steps: determining a power delay spectrum according to the tag preamble; according to a preset detection method, determining the number of peaks greater than a preset peak threshold in the power delay spectrum, wherein the preset detection method can comprise the following steps: a detection method based on a multipath expansion domain and/or a detection method based on normalized frequency offset; and determining the conflict result according to the peak value number.
The device access method provided by the invention comprises the following steps: under the condition that the number of the peaks is larger than a preset number threshold value, the conflict result indicates that conflict occurs between the terminal equipment and the base station; and under the condition that the number of the peaks is smaller than or equal to the preset number threshold value, the conflict result indicates that no conflict occurs between the terminal equipment and the base station.
In a third aspect, the present invention further provides a terminal device, including:
the processing module is used for determining an initial preamble according to the preamble sequence and a conjugate sequence corresponding to the preamble sequence; responding to a label mapping instruction, and determining a label lead code corresponding to the initial lead code according to the initial lead code and the lead index number, wherein the root serial number of the initial lead code corresponds to the lead index number one by one;
the receiving and transmitting module is used for transmitting the tag lead code to the base station, wherein the tag lead code is used for collision detection of the base station to obtain a collision result; receiving the conflict result sent by the base station;
the processing module is further configured to determine an access result according to the collision result.
In a fourth aspect, the present invention also provides a base station, including:
the receiving and transmitting module is used for receiving a label lead code sent by the terminal equipment, wherein the label lead code is obtained by the terminal equipment according to an initial lead code and a lead index number, a root serial number of the initial lead code corresponds to the lead index number one by one, and the initial lead code is determined according to a lead sequence and a conjugate sequence corresponding to the lead sequence;
The processing module is used for carrying out conflict detection on the tag preamble to obtain a conflict result;
the transceiver module is further configured to send the collision result to the terminal device, where the collision result is used for the terminal device to determine an access result.
In a fifth aspect, the present invention further provides a device access system, including: terminal equipment and a base station;
the terminal equipment is used for determining an initial preamble according to the preamble sequence and a conjugate sequence corresponding to the preamble sequence; responding to a label mapping instruction, and determining a label lead code corresponding to the initial lead code according to the initial lead code and the lead index number, wherein the root serial number of the initial lead code corresponds to the lead index number one by one; transmitting the tag preamble to the base station;
the base station is used for receiving the label lead code sent by the terminal equipment; performing conflict detection on the label lead code to obtain a conflict result; transmitting the conflict result to the terminal equipment;
the terminal equipment is also used for receiving the conflict result sent by the base station and determining an access result according to the conflict result.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the device access method according to the first and/or second aspects when executing the program.
The invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the device access method according to the first and/or second aspects.
The invention also provides a computer program product comprising a computer program which, when executed by a processor, implements the device access method according to the first and/or second aspects.
According to the device access method, the terminal device, the base station, the system and the electronic device, the initial preamble is determined through the terminal device according to the preamble sequence and the conjugate sequence corresponding to the preamble sequence; responding to a label mapping instruction, and determining a label lead code corresponding to the initial lead code according to the initial lead code and the lead index number, wherein a root serial number of the initial lead code corresponds to the lead index number one by one; transmitting the tag preamble to a base station; the base station receives a label lead code sent by the terminal equipment; performing conflict detection on the tag preamble to obtain a conflict result; transmitting the conflict result to the terminal equipment; and the terminal equipment receives the conflict result sent by the base station and determines an access result according to the conflict result. The method is used for solving the defect of higher false detection rate in the conflict detection link in the existing equipment access method, and generating the label lead code corresponding to the initial lead code according to the one-to-one correspondence between the root serial number of the initial lead code and the lead index number so as to prepare a base station for more accurate conflict detection of the label lead code, thereby reducing the conflict false detection rate and improving the effective access quantity of the terminal equipment.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1a is a schematic diagram of a scenario of a device access method provided by the present invention;
FIG. 1b is a schematic diagram of a second scenario of the device access method according to the present invention;
fig. 2 is a schematic flow chart of a device access method provided by the present invention;
fig. 3a is a schematic diagram of a relationship among a cyclic prefix, a guard time interval and a length of a preamble sequence in a random access preamble provided by the present invention;
fig. 3b is a schematic structural diagram of a random access preamble provided by the present invention;
FIG. 3c is a schematic diagram of a scenario in which a peak is detected after a power delay profile is determined according to the present invention;
FIG. 3d is a schematic diagram of a power delay profile provided by the present invention;
FIG. 3e is a diagram illustrating a second power delay profile provided by the present invention;
FIG. 3f is a third schematic diagram of the power delay profile provided by the present invention;
Fig. 4 is a schematic structural diagram of a terminal device provided by the present invention;
fig. 5 is a schematic structural diagram of a base station provided by the present invention;
fig. 6 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1a is a schematic view of a scenario of a device access method according to the present invention. In fig. 1a, a device access system 10 may include a terminal device 20 and a base station 30.
The terminal device 20 refers to a mobile device capable of performing data transmission with the base station 30 through a wireless communication technology, and it should be noted that the terminal device 20 according to the embodiment of the present invention does not have a positioning function.
Alternatively, the number of terminal devices 20 is not limited. In fig. 1a, the number of terminal devices 20 is 5.
Optionally, the terminal device 20 may include: computer, mobile terminal, wearable device, etc.
The base station 30 refers to a radio transceiver station that performs data transmission with the terminal device 20 through a wireless communication technology in a certain radio coverage area.
Alternatively, the number of base stations 30 is not limited. In fig. 1a, the number of base stations 30 is 1.
Alternatively, the base station 30 may include: low orbit satellites. In fig. 1a, the distance between the low-orbit satellite and the ground is 660km.
Alternatively, the wireless communication technology may include, but is not limited to, one of the following: fourth generation communication technology (the 4Generation mobile communication technology,4G), fifth generation communication technology (the 5Generation mobile communication technology,5G), wireless fidelity technology (Wireless Fidelity, wiFi), and the like.
In fig. 1a, the terminal device 20 may determine an initial preamble according to the preamble sequence and a conjugate sequence corresponding to the preamble sequence; then, in response to the label mapping instruction, determining a label lead code corresponding to the initial lead code according to the initial lead code and the lead index number, wherein the root serial number of the initial lead code corresponds to the lead index number one by one; then, transmitting the tag preamble to the base station 30; the base station 30 may receive the tag preamble transmitted by the terminal device 20; performing conflict detection on the label lead code to obtain a conflict result; then, the collision result is transmitted to the terminal device 20; the terminal device 20 receives the collision result sent by the base station 30, and determines an access result according to the collision result. In this way, the whole device access method can effectively solve the defect of higher false detection rate in the conflict detection link in the existing device access method, and generates the tag preamble corresponding to the initial preamble according to the one-to-one correspondence between the root sequence number of the initial preamble and the preamble index number, so that the base station can perform more accurate conflict detection on the tag preamble, and the conflict false detection rate is reduced to improve the effective access quantity of the terminal device.
Exemplary, as shown in fig. 1b, a schematic view of a device access method provided by the present invention is shown. As can be seen from fig. 1b, before the terminal device performs random access, the base station sends system information (System Information, SI) to the terminal device, where the system information may carry random access configuration information, and the random access configuration information may include an optional preamble and time-frequency resource. The terminal device then generates first information according to the random access configuration information, where the first information may be represented by Msg a, where the Msg a may include a randomly selected preamble (preamble) and a corresponding data payload (payload), and sends the first information to the base station in a specific time-frequency resource. Then, after receiving the Msg a sent by the terminal device, the base station may detect a preamble in the Msg a, and if the base station successfully detects a preamble sequence in the preamble, the base station will continue to process the data load in the Msg a, and obtain second information according to a detection result corresponding to the preamble sequence and a detection result corresponding to the data load, where the second information may be represented by Msg B, and then send the Msg B to the terminal device. And finally, the terminal equipment receives the Msg B sent by the base station and accesses the base station according to the Msg B.
The following describes embodiments of the present invention further with respect to a base station and a terminal device.
As shown in fig. 2, a flow chart of a device access method provided by the present invention may include:
201. the terminal equipment determines an initial preamble according to the preamble sequence and the conjugate sequence corresponding to the preamble sequence.
Wherein the preamble sequence may be a ZC (Zadoff-Chu) sequence having good constant amplitude zero auto-correlation (Constant Amplitude Zero Auto Correlation, CAZAC) properties and minimal cross-correlation properties. The preamble sequence may be used by ZC u (n) represents a compound.
The conjugated sequence can be ZC u * (n) represents a compound.
The initial preamble may be x c (n) is also a ZC sequence.
The terminal equipment can firstly acquire the preamble sequence and a conjugate sequence corresponding to the preamble sequence; and then, the terminal equipment determines an initial lead code according to the lead sequence and the conjugate sequence, and provides data support for the label lead code corresponding to the initial lead code which is determined subsequently.
It should be noted that, at most, 64 preamble sequences are available to the terminal device for user selection in the cell corresponding to each base station, and these preamble sequences may be generated by different cyclic shifts from one root sequence. If one root sequence cannot generate 64 preambles, it may also be generated by a plurality of root sequences through different cyclic shifts. Depending on the nature of the ZC sequences, different cyclic shift sequences using the same root sequence are orthogonal, i.e., interference is introduced, and different cyclic shift sequences using different root sequences are non-orthogonal. Therefore, in order to reduce the influence of non-orthogonal interference, the preamble sequences should be generated from the same root sequence as much as possible.
Optionally, in the process of determining the preamble sequence, the terminal device may determine the random access preamble according to the design criterion; and determining a required preamble sequence according to the random access preamble.
The design criteria may include, among others: t (T) CP ≥T RTDmax +τ max ≈T RTDmax ；T GT ≥T RTDmax ；T SEQ ≥T RTDmax +τ max ≈T RTDmax 。
T CP Indicating the length of a Cyclic Prefix (CP); t (T) RTDmax Indicating the maximum round trip transmission delay; τ max Representing the maximum multipath delay of the ka band; t (T) GT Representing the length of a guard time interval (Guard Time interval, GT); t (T) SEQ The length of the leader (leader) Sequence (SEQ) is shown.
The cyclic prefix CP is effective in compensating channel delay, solving inter-symbol interference problem caused by different communication distances, and ensuring signal integrity in a receiving window.
It should be noted that, as shown in fig. 3a, a schematic diagram of a relationship among a cyclic prefix, a guard time interval and a length of a preamble sequence in a random access preamble provided by the present invention is shown. Based on fig. 3a, since the terminal devices all perform timing advance adjustment based on the base station side downlink subframe transmission time, the difference between the time when the base station performs uplink reception timing and the time when the terminal device transmits the preamble to the base station should be greater than 2 times of the maximum unidirectional transmission delay T STDmax With maximum multipath delay tau max And (3) summing. Maximum unidirectional transmission delay T of 2 times STDmax Recorded as maximum round trip transmission delay T RTDmax At this time, T CP ≥T RTDmax +τ max 。
The guard interval GT is used to eliminate interference between adjacent subframes, so as to ensure that the data of two frames are correctly received by the base station, and T is GT ≥T RTDmax 。
The base station obtains the terminal by detecting the preamble sequenceThe transmission delay of the end device, so the preamble duration must take into account the maximum round trip transmission delay T RTDmax Maximum multipath delay spread τ max T, i.e SEQ ≥T RTDmax +τ max 。
Taking the base station in fig. 1a as an example, the maximum round trip delay difference T is 660km RTDmax The value of (2) is 4.44ms, and the maximum multipath delay of the ka band is 10ns.
In consideration of subcarrier orthogonality, T SEQ ＝L/(Δf RA )，L∈N。
L represents a cyclic shift, l=0, 1, …, [1, L RA /(N CS -1)]，L RA Representing the sequence length of the random access preamble, N CS Representing a cyclic shift interval; n represents a parameter; Δf RA Representing the random access channel subcarrier width.
For example, Δf according to the third generation partnership project (the 3rd Generation Partner Project,3GPP) protocol 38.821 and the 5G standard RA The value of (C) is 15kHz, at this time, T SEQ =l×66.67us; according to the 5G standard, L RA The value of (3) is 839 or 139.
Furthermore, to meet the 3GPP protocol 38.821 and 5G standards, the sum of the cyclic prefix CP, the preamble sequence SEQ, the guard interval GT should be an integer multiple of 1ms of the subframe length, and assuming that the integer multiple is 16, the total length of the random access preamble is 16ms, at this time T CP The value of (2) is 4.8ms, T SEQ Is 4.8ms and T GT The value of (2) is 6.4ms.
Then, in order to improve the signal detection performance under the signal-to-noise ratio, the preamble sequence SEQ may be repeated, as shown in fig. 3b, which is a schematic structural diagram of the random access preamble provided by the present invention, and in fig. 3b, the preamble sequence SEQ is repeated 6 times. According to the 5G standard, the value of the subcarrier width of the physical random access channel (Physical Random Access Channel, PRACH) is 1.25kHz, and at this time, the length of the orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbol in the PRACH is 0.8ms.
Also, since the cyclic shifts of the preamble sequences SEQ are the same, at the base stationIn the power delay profile (Power Delay Profile, PDP) corresponding to each preamble sequence SEQ, the peaks overlap at the same position. While the round trip delay difference of the satellite is far greater than the length T of the preamble sequence SEQ SEQ Wherein the length T of the leader sequence SEQ SEQ The corresponding delay τ may include an integer multiple of the delay length τ f And a fractional time delay length tau i I.e. τ=τ f +τ i ，τ f＝ τmodT SEQ . Since the leader sequence SEQ is repeated, τ is f ＜T SEQ 。
At this time, the terminal device obtains a preamble sequence ZC u (n)＝x u ((n+vN cs )modL RA ) V.epsilon.1, 2, …, V; n represents the number of samples and v represents the number of staggered peaks in the PDP generated by cross-correlating the preamble sequence SEQ with the local sequence in the base station.
It should be noted that the Doppler frequency offset is related to ZC u (n) and ZC u * The effect of (n) is symmetrical, and the process is specifically demonstrated as follows: suppose ZC u (n) the peak position in PDP when not affected by Doppler frequency offset is m, and the peak position in PDP when affected by Doppler frequency offset with normalized frequency offset of Δf is m ZC ，ZC u * (n) the peak position in PDP is m when affected by Doppler frequency offset with normalized frequency offset of Δf ZC* At this time, according to the first and second formulas, the Doppler frequency offset is known for ZC u (n) and ZC u * The effect of (n) is symmetrical.
Wherein, the first formula is:
the second formula is:
representing a received signal of the base station; x (n) represents a local sequence in a base station; h represents the channel gain of the channel on which the received signal y (n) is located; w (n) represents gaussian noise; x is x u (n) represents a preamble sequence, u represents a preamble sequence x u Root sequence number of (n), u.epsilon.1, L RA -1]；x * u (n+m) represents a conjugate sequence corresponding to the peak position m; corr (Corr) w,u (m) represents a noise function generated by cross-correlating the gaussian noise w (n) with the local sequence x (n).
In some embodiments, the determining, by the terminal device, the initial preamble according to the preamble sequence and the conjugate sequence corresponding to the preamble sequence may include: and the terminal equipment overlaps the preamble sequence and the conjugate sequence corresponding to the preamble sequence to obtain an initial preamble.
Wherein, the sum of the root sequence number of the preamble sequence and the root sequence number of the conjugate sequence is the same as the sequence length of the initial preamble.
After the terminal equipment acquires the preamble sequence and the conjugate sequence, the terminal equipment calculates the frequency offset of the ZC from the Doppler frequency offset u (n) and ZC u * The influence of (n) proves that the influence of (m) ZC -Δf RA )modL RA =0, i.e. um ZC ＝(aL RA +Δf RA ) In the case of/u, a peak occurs in the PDP corresponding to the preamble sequence, and similarly, in (um ZC* +Δf RA )modL RA =0, i.e. um ZC* ＝(bL RA -Δf RA ) In the case of/u, a peak value is also generated in the PDP corresponding to the preamble sequence for collision detection by the subsequent base station, so that the terminal device can superimpose the preamble sequence and the conjugate sequence to obtain an initial preamble, i.e., x c (n)＝ZC u (n)+ZC u * (n)。
Wherein a represents a first preset parameter, a ε N; b represents a second preset parameter b e N.
The conjugated sequence ZC u * (n) can satisfy
Wherein x is * r (n) represents a preamble sequence x u A conjugated sequence of (n); r represents a conjugated sequence x * r (n) and satisfies r+u=the sequence length of the initial preamble, which is a prime number.
Since n is an integer, n (n+1) is an even number, and e is jπun(n+1) ＝1。
202. And the terminal equipment responds to the label mapping instruction, and determines a label lead code corresponding to the initial lead code according to the initial lead code and the lead index number.
Wherein the root sequence number of the initial preamble corresponds to the preamble index number one by one.
The preamble index refers to a separate, physical storage structure that orders the root sequence number of the initial preamble.
The tag preamble refers to a preamble obtained by adding a preamble index number to the initial preamble, and the usable ZC ki (n) represents, k i Representing a tag preamble ZC ki (n) root sequence number.
In order to avoid that a plurality of preamble index numbers correspond to a tag sequence with the same root sequence number, a user can input a tag mapping instruction to terminal equipment based on the corresponding relation between the root sequence number of an initial preamble code and the preamble index number; and then, the terminal equipment responds to the label mapping instruction, and determines a label lead code corresponding to the initial lead code according to the root serial number of the initial lead code and the lead index number so as to enable a subsequent base station to perform conflict detection based on the label lead code.
In some embodiments, the determining, by the terminal device, the tag preamble corresponding to the initial preamble according to the initial preamble and the preamble index number may include: the terminal equipment obtains a root serial number of a label lead code corresponding to the initial lead code according to a mapping formula; the terminal equipment determines the tag preamble according to the root sequence number of the tag preamble.
Wherein, the mapping formula is: k (k) i =f (i), k+.r and k+.u;
i represents a preamble index number; k (k) i A root sequence number representing a tag preamble; f (i) represents a mapping function corresponding to the preamble index number i; k represents the root sequence number set of the tag preamble, K i E, K; r represents a root sequence number set of a preamble sequence in an initial preamble; u denotes the set of root sequence numbers of the co-sequence in the initial preamble.
In the process of determining the tag preamble, the terminal equipment determines that the root sequence number of the preamble is different from the root sequence number of the tag preamble, namely k i =f (i), k+.r, and conjugate sequence ZC u * (n) satisfyTherefore, the terminal device can obtain a mapping formula; and then, according to the mapping formula, obtaining the root serial number of the label lead code corresponding to the initial lead code, and further determining the label lead code. In this way, since the root sequence number of the initial preamble corresponds to the preamble index number one by one, even if a plurality of tag sequences using different preamble index numbers use the same root sequence number in the subsequent collision detection process, the tag index which does not collide will not be determined to collide, so as to effectively reduce the collision false detection rate.
203. The terminal device transmits the tag preamble to the base station.
The base station receives the tag preamble sent by the terminal equipment.
204. And the base station performs conflict detection on the tag preamble to obtain a conflict result.
Wherein the collision result may indicate that a collision or no collision occurs between the terminal device and the base station.
After receiving the tag preamble sent by the terminal equipment, the base station can perform conflict detection on the tag preamble and judge whether the terminal equipment collides with the base station or not so as to obtain a conflict result with higher accuracy.
Alternatively, in case the collision result indicates that no collision between the terminal device and the base station occurs, the collision result may include a device identification allowing access.
In some embodiments, the base station performs collision detection on the tag preamble to obtain a collision result, which may include: the base station determines a power delay spectrum according to the tag preamble; the base station determines the number of peaks greater than a preset peak threshold in the power delay spectrum according to a preset detection method; and the base station determines a conflict result according to the peak value number.
The preset detection method may include: detection methods based on multipath expansion domain and/or detection methods based on normalized frequency offset.
After the base station determines the power delay spectrum according to the label lead code, the base station can determine the number of peaks larger than a preset peak threshold value in the power delay spectrum by adopting a detection method based on a multipath expansion domain in order to eliminate the influence of Doppler frequency offset, and can determine the number of peaks larger than the preset peak threshold value in the power delay spectrum by adopting a detection method based on a normalization frequency offset, so that the number of the obtained peaks is more accurate; then, the base station can obtain a conflict result with higher accuracy according to the number of peaks so as to effectively reduce the conflict false detection rate.
In some embodiments, if the number of peaks is greater than a preset number threshold, the collision result indicates that a collision occurs between the terminal device and the base station; and under the condition that the number of the peaks is smaller than or equal to a preset number threshold value, the conflict result indicates that no conflict occurs between the terminal equipment and the base station.
The preset number threshold may be set before the base station leaves the factory, or may be user-defined, which is not specifically limited herein.
It should be noted that, the conflict result indicates that a conflict occurs between the terminal device and the base station, which indicates that the terminal device cannot access the base station; the conflict result indicates that no conflict occurs between the terminal equipment and the base station, which indicates that the terminal equipment can effectively access the base station.
Optionally, the determining, by the base station, the power delay spectrum according to the tag preamble may include: and the base station performs cross-correlation on the tag preamble and the local sequence to obtain a power delay spectrum.
Exemplary, as shown in fig. 3c, a schematic diagram of a scenario for detecting a peak after determining a power delay profile according to the present invention is shown. In fig. 3c, the base station may send a preamble sequence ZC u (n), conjugated sequence ZC u * (n) and a tag preamble ZC ki (n) performing Discrete Fourier Transform (DFT) after alignment to obtain a first sequence; then, performing Discrete Fourier Transform (DFT) on the local sequence in the base station, and then obtaining a conjugate to obtain a second sequence; then, performing point multiplication on the first sequence and the second sequence, and converting the first sequence and the second sequence into a frequency domain to obtain PDP; finally, the base station performs inverse discrete Fourier transform on the PDP and then square the module to perform peak detection.
The timing of determining the first sequence by the base station and determining the second sequence by the base station is not limited.
Taking a case that 5 terminal devices are concurrently connected to the base station at the transmitting end, as shown in fig. 3d, the power delay spectrum provided by the invention is schematic. In fig. 3d, 3 of the 5 terminal devices collide and use the same preamble index number, and the remaining 2 terminal devices each use a different preamble index number. Then, in the process of collision detection for the terminal device with collision, the base station adopts different preamble index numbers from the terminal device without collision, so that 3 peaks appear in the PDP.
Taking an example that 5 terminal devices are concurrently connected to the base station at the transmitting end, as shown in fig. 3e, the power delay spectrum provided by the present invention is schematic. As can be seen from fig. 3e, in case k+.r, the number of peaks occurring in the PDP is not accurate enough, since these 5 terminal devices may use different preamble index numbers, but the same tag root sequence number may exist.
Optionally, in the case that the preset detection method is a detection method based on a multipath expansion domain, the determining, by the base station according to the preset detection method, the number of peaks in the power delay spectrum that are greater than a preset peak threshold may include: the base station determines a peak value position and a multipath expansion domain corresponding to the peak value position in a power delay spectrogram; under the condition that the base station determines that a peak value larger than a preset peak value threshold exists in a detection area corresponding to the multipath expansion domain, determining that the multipath expansion domain corresponds to a peak value, and determining the peak value as a target peak value; the base station then determines the number of target peaks.
Wherein the multipath expansion domains corresponding to different peak positions can be the same or different, and the multipath expansion domain D NS The preset peak value threshold may be set before the base station leaves the factory, or may be user-defined, which is not specifically limited herein.
The peak position can be represented by m; multipath expansion domain availability D NS Representation, D NS ≥[τ ds (L RA /T SEQ )]，τ ds Representing a multipath maximum delay spread; preset peak threshold available y th A representation; the detection area is available (m+D) NS )modL RA And (3) representing.
In the process of adopting a detection method based on a multipath expansion domain to carry out conflict detection on a power delay spectrogram, a base station can firstly determine a peak position and a multipath expansion domain corresponding to the peak position; then, the base station performs collision detection again in the detection area corresponding to the multipath expansion domain, and determines that the multipath expansion domain corresponds to only one target peak no matter how many peaks larger than a preset peak threshold are detected in the detection area, so that the number of the target peaks can be determined.
Wherein the number of target peaks is less than or equal to the number of peak positions.
In addition, the cyclic shift index of the tag sequence is N in total l And N l ＝L RA /N CS ，N CS Indicating the detection window size, i.e. window_size=n CS 。
Exemplary, as shown in fig. 3f, is a schematic diagram of a power delay profile provided by the present invention. FIG. 3f shows a PDP obtained by cascading multiple short sequences by a base station, specifically, the base station may intercept the obtained tag preamble to obtain p short sequences, where p is equal to or greater than 2; then, the base station carries out cross correlation on the p short sequences and the corresponding local sequences respectively to obtain p PDP; then, the base station will make the The p PDPs are superimposed, and 1 peak is determined from the superimposed PDPs. From the superimposed PDP, it can be seen that a pseudo peak appears at a position beside the main peak, and the base station can detect a detection window of size N CS In the detection window of the multi-path expansion domain, namely in the detection region corresponding to the multi-path expansion domain, performing collision detection again; then, the base station counts the number of windows generating conflict as 1 under the condition that a peak value larger than a preset peak value threshold exists in a detection window, wherein the number of windows can be expressed by window_collision; then, the base station performs conflict detection on a plurality of detection windows and counts the total number of the windows generating conflict, wherein the total number of the windows can be expressed by window_color_sum; then, the base station determines that the peak positions in the corresponding detection windows conflict under the condition that the total number of the windows is larger than a preset number threshold value.
Wherein the total number of windows is less than or equal to the number of peak positions.
Optionally, in the case that the preset detection method is a detection method based on normalized frequency offset, the determining, by the base station according to the preset detection method, the number of peaks in the power delay spectrum that are greater than a preset peak threshold may include: the base station determines a first normalized frequency offset and a second normalized frequency offset corresponding to the power delay spectrum; and the base station determines the number of peaks in the power delay spectrum, which is larger than a preset peak threshold value, according to the first position corresponding to the first normalized frequency offset and the second position corresponding to the second normalized frequency offset.
Wherein the first normalized frequency offset may be Δf 1 A representation; the first position can be m 11 A representation; the second normalized frequency offset is available as delta f 2 Expressed as Deltaf 2 ＝Δf 1 +1; the second position can use m 21 And (3) representing.
In the process of carrying out conflict detection on the power delay spectrogram by adopting a detection method based on normalized frequency offset, a base station can firstly determine a first normalized frequency offset and a second normalized frequency offset corresponding to the power delay spectrogram; then, the base station determines a correlation function according to the first position corresponding to the first normalized frequency offset and the second position corresponding to the second normalized frequency offset, the correlation function has a peak value, and the correlation function is thatAssuming that only one terminal device is accessed and the peak position in the selected detection window is generated for the access of the terminal device, setting the peak position generated by the terminal device as M, at this time, the base station can obtain uΔm=cl according to the correlation function RA +1，c∈N，ΔM＝m 21 -m 11 C=b-a; further deriving Δm= (cL) RA +1)/u, so that the base station can obtain an offset position corresponding to the first normalized frequency offset and an offset position corresponding to the second normalized frequency offset.
In order to improve the collision detection efficiency, the base station only needs to obtain the first normalized frequency offset Δf 1 The base station can detect the position difference delta M generated when taking one time of frequency offset according to the difference delta M and the peak position M at the left and right sides of a detection window in the PDP, if (M+delta M) mod L is determined RA If the peak value is larger than the preset peak value threshold value, then the terminal equipment and the base station are determined to have no conflict, otherwise, the terminal equipment and the base station are determined to have the conflict.
Under the condition that a plurality of terminal devices try to access the base station, the base station can firstly acquire a peak position set which is larger than a preset peak value threshold value, then a detection window is adopted to conduct multipath discrimination, if the distance between two peak positions is smaller than the size of the detection window, the peak values corresponding to the two peak positions are determined to be generated by one terminal device, finally, the number of peak values which are larger than the preset peak value threshold value is counted, and the number of peak values can be represented by a collesion_sum.
Exemplary, under the condition that the number of the peaks is larger than or equal to 3, the collision between the terminal equipment and the base station is illustrated; in the case of collision_sum=2, it is explained that no collision occurs between the terminal device and the base station; in the case of collision_sum=1, the following budget needs to be made for each peak value greater than the preset peak threshold: using a first normalized frequency offset Deltaf 1 Root sequence number k of tag preamble i And the sequence length L 'of the initial preamble' RA Obtaining the peak under Doppler shift Determining a peak position M 'larger than a preset peak threshold value according to the position difference value delta M' corresponding to the value; then, based on (M ' +ΔM ') mod L ' RA The position of the possible shift under the influence of the frequency offset is determined. If in (M ' +ΔM ') mod L ' RA If the peak value is larger than the preset peak value threshold value, then the terminal equipment and the base station are determined to have no conflict, otherwise, the terminal equipment and the base station are determined to have the conflict.
In the process of carrying out conflict detection on the power delay spectrogram by the base station in the preset detection method, namely the detection method based on the multipath expansion domain and the detection method based on the normalized frequency offset, the base station can obtain a third normalized frequency offset delta f through timing detection 3 And a maximum Time Advance (TA) value; then, the base station intercepts the tag preamble to obtain a plurality of subsequences, and cross-correlates the subsequences with corresponding local sequences to obtain a plurality of PDPs, wherein the number of PDPs is the same as the number of the subsequences; then, the base station superimposes the plurality of PDPs, and in the superimposed PDPs, carries out peak detection by adopting a detection window so as to count a peak position set which is larger than a preset peak threshold value, wherein the cyclic shift L of a plurality of terminal devices is different and is influenced by multipath, so that a plurality of peak positions appear in the peak position set, and in order to eliminate the influence caused by multipath, if the distance between any two peak positions is smaller than the size of the detection window, the access of one terminal device is calculated to generate a peak value; thereafter, the base station counts the number of peaks, which may be represented by n.
Wherein, in the case of n=0, it is stated that the terminal device does not transmit the tag preamble to the base station; in the case of n=1, it is indicated that the base station detects the tag preamble and that no collision occurs between the terminal device and the base station; in the case of n=3, it is explained that a collision occurs between the terminal device and the base station; in the case of n=2, the third normalized frequency offset Δf is utilized 3 Root sequence number k of tag preamble i And the sequence length L 'of the initial preamble' RA Obtaining a position difference value delta M 'corresponding to the peak value under Doppler shift, and determining a peak value position M' larger than a preset peak value threshold value; then based on(M’+ΔM’)modL’ RA The position of the possible shift under the influence of the frequency offset is determined. If in (M ' +ΔM ') mod L ' RA If the peak value is larger than the preset peak value threshold value, then n is 1, and no conflict occurs between the terminal equipment and the base station.
205. And the base station sends the conflict result to the terminal equipment.
And the terminal equipment receives the conflict result sent by the base station.
Optionally, the base station sends the conflict result to the terminal equipment corresponding to the equipment identifier allowed to be accessed.
It will be appreciated that in the case where the terminal device is a terminal device to which the base station is allowed access, the collision result sent by the base station may be received.
206. And the terminal equipment determines an access result according to the conflict result.
After receiving a conflict result sent by a base station, the terminal equipment can not access the base station according to an access result when the conflict result indicates that the conflict occurs between the terminal equipment and the base station, and at the moment, the terminal equipment and the base station can not establish a connection relationship; and under the condition that the conflict result indicates that no conflict occurs between the terminal equipment and the base station, the access result is that the terminal equipment can be effectively accessed to the base station, and at the moment, the terminal equipment and the base station can establish an effective connection relationship for subsequent data transmission.
In the embodiment of the invention, the device access method can effectively solve the defect of higher false detection rate in the conflict detection link in the existing device access method, and generates the label lead code corresponding to the initial lead code according to the one-to-one correspondence between the root serial number of the initial lead code and the lead index number so as to prepare a base station for more accurately detecting the conflict of the label lead code, thereby reducing the false detection rate of the conflict and improving the effective access quantity of the terminal device.
As shown in fig. 4, a schematic structural diagram of a terminal device provided by the present invention may include:
A processing module 401, configured to determine an initial preamble according to a preamble sequence and a conjugate sequence corresponding to the preamble sequence; responding to a label mapping instruction, and determining a label lead code corresponding to the initial lead code according to the initial lead code and the lead index number, wherein the root serial number of the initial lead code corresponds to the lead index number one by one;
a transceiver module 402, configured to send the tag preamble to a base station, where the tag preamble is used for collision detection by the base station, so as to obtain a collision result; receiving the conflict result sent by the base station;
the processing module 401 is further configured to determine an access result according to the collision result.
Optionally, the processing module 401 is specifically configured to superimpose the preamble sequence and a conjugate sequence corresponding to the preamble sequence to obtain the initial preamble; wherein the sum of the number of the root sequence numbers of the preamble sequence and the number of the root sequence numbers of the conjugate sequence is the same as the sequence length of the initial preamble.
Optionally, the processing module 401 is specifically configured to obtain, according to a mapping formula, a root sequence number of the tag preamble corresponding to the initial preamble; determining the tag preamble according to the root sequence number of the tag preamble; wherein, the mapping formula is: k (k) i =f (i), k+.r and k+.u; i represents the leading index number; k (k) i A root sequence number representing the tag preamble; f (i) represents a mapping function corresponding to the preamble index number i; k represents the root sequence number set of the tag preamble, K i E, K; r represents the root sequence number set of the preamble sequence in the initial preamble; u denotes the set of root sequence numbers of the co-sequence in the initial preamble.
As shown in fig. 5, a schematic structural diagram of a base station provided by the present invention may include:
a transceiver module 501, configured to receive a tag preamble sent by a terminal device, where the tag preamble is obtained by the terminal device according to an initial preamble and a preamble index, a root sequence number of the initial preamble corresponds to the preamble index one to one, and the initial preamble is determined according to a preamble sequence and a conjugate sequence corresponding to the preamble sequence;
the processing module 502 is configured to perform collision detection on the tag preamble to obtain a collision result;
the transceiver module 501 is further configured to send the collision result to the terminal device, where the collision result is used for the terminal device to determine an access result.
Optionally, the processing module 502 is specifically configured to determine a power delay spectrum according to the tag preamble; according to a preset detection method, determining the number of peaks greater than a preset peak threshold in the power delay spectrum, wherein the preset detection method can comprise the following steps: a detection method based on a multipath expansion domain and/or a detection method based on normalized frequency offset; and determining the conflict result according to the peak value number.
Optionally, if the number of peaks is greater than a preset number threshold, the collision result indicates that a collision occurs between the terminal device and the base station; and under the condition that the number of the peaks is smaller than or equal to the preset number threshold value, the conflict result indicates that no conflict occurs between the terminal equipment and the base station.
As shown in fig. 6, a schematic structural diagram of an electronic device provided by the present invention may include: processor 610, communication interface (Communications Interface) 620, memory 630, and communication bus 640, wherein processor 610, communication interface 620, and memory 630 communicate with each other via communication bus 640. The processor 610 may invoke logic instructions in the memory 630 to perform a device access method comprising: the terminal equipment determines an initial preamble according to the preamble sequence and a conjugate sequence corresponding to the preamble sequence; responding to a label mapping instruction, and determining a label lead code corresponding to the initial lead code according to the initial lead code and the lead index number, wherein the root serial number of the initial lead code corresponds to the lead index number one by one; transmitting the tag preamble to a base station; the base station receives a label lead code sent by the terminal equipment; performing conflict detection on the label lead code to obtain a conflict result; transmitting the conflict result to the terminal equipment; and the terminal equipment receives the conflict result sent by the base station and determines an access result according to the conflict result.
Further, the logic instructions in the memory 630 may be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program, the computer program being storable on a non-transitory computer readable storage medium, the computer program, when executed by a processor, being capable of performing the device access method provided by the methods described above, the method comprising: the terminal equipment determines an initial preamble according to the preamble sequence and a conjugate sequence corresponding to the preamble sequence; responding to a label mapping instruction, and determining a label lead code corresponding to the initial lead code according to the initial lead code and the lead index number, wherein the root serial number of the initial lead code corresponds to the lead index number one by one; transmitting the tag preamble to a base station; the base station receives a label lead code sent by the terminal equipment; performing conflict detection on the label lead code to obtain a conflict result; transmitting the conflict result to the terminal equipment; and the terminal equipment receives the conflict result sent by the base station and determines an access result according to the conflict result.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform a device access method provided by the above methods, the method comprising: the terminal equipment determines an initial preamble according to the preamble sequence and a conjugate sequence corresponding to the preamble sequence; responding to a label mapping instruction, and determining a label lead code corresponding to the initial lead code according to the initial lead code and the lead index number, wherein the root serial number of the initial lead code corresponds to the lead index number one by one; transmitting the tag preamble to a base station; the base station receives a label lead code sent by the terminal equipment; performing conflict detection on the label lead code to obtain a conflict result; transmitting the conflict result to the terminal equipment; and the terminal equipment receives the conflict result sent by the base station and determines an access result according to the conflict result.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A device access method, applied to a terminal device, the method comprising:
determining an initial preamble according to the preamble sequence and a conjugate sequence corresponding to the preamble sequence;
responding to a label mapping instruction, and determining a label lead code corresponding to the initial lead code according to the initial lead code and the lead index number, wherein a root serial number of the initial lead code corresponds to the lead index number one by one;
the label lead code is sent to a base station, and the label lead code is used for conflict detection by the base station to obtain a conflict result;
and receiving the conflict result sent by the base station, and determining an access result according to the conflict result.
2. The method of claim 1, wherein the determining the initial preamble based on the preamble sequence and the conjugate sequence corresponding to the preamble sequence comprises:
superposing the preamble sequence and a conjugate sequence corresponding to the preamble sequence to obtain the initial preamble;
and the sum of the number of the root sequence numbers of the preamble sequences and the number of the root sequence numbers of the conjugate sequences is the same as the sequence length of the initial preamble.
3. The method according to claim 1 or 2, wherein the determining the tag preamble corresponding to the initial preamble according to the initial preamble and the preamble index number includes:
Obtaining a root sequence number of the label lead code corresponding to the initial lead code according to a mapping formula;
determining the tag preamble according to the root sequence number of the tag preamble;
wherein, the mapping formula is: k (k) i =f (i), k+.r and k+.u;
i represents the leading index number; k (k) i A root sequence number representing the tag preamble; f (i) represents a mapping function corresponding to the preamble index number i; k represents the root sequence number set of the tag preamble, K i E, K; r represents a root sequence number set of a preamble sequence in the initial preamble; u represents the set of root sequence numbers of the conjugate sequences in the initial preamble.
4. A device access method, applied to a base station, the method comprising:
receiving a label lead code sent by terminal equipment, wherein the label lead code is obtained by the terminal equipment according to an initial lead code and a lead index number, a root serial number of the initial lead code corresponds to the lead index number one by one, and the initial lead code is determined according to a lead sequence and a conjugate sequence corresponding to the lead sequence;
performing conflict detection on the tag preamble to obtain a conflict result;
and sending the conflict result to the terminal equipment, wherein the conflict result is used for determining an access result by the terminal equipment.
5. The method of claim 4, wherein the performing collision detection on the tag preamble to obtain a collision result comprises:
determining a power delay spectrum according to the tag preamble;
according to a preset detection method, determining the number of peaks greater than a preset peak threshold in the power delay spectrum, wherein the preset detection method can comprise the following steps: a detection method based on a multipath expansion domain and/or a detection method based on normalized frequency offset;
and determining the conflict result according to the peak value number.
6. The method according to claim 5, comprising:
under the condition that the number of peaks is larger than a preset number threshold, the conflict result indicates that conflict occurs between the terminal equipment and the base station;
and under the condition that the number of the peaks is smaller than or equal to the preset number threshold, the conflict result indicates that no conflict occurs between the terminal equipment and the base station.
7. A terminal device, comprising:
the processing module is used for determining an initial preamble according to the preamble sequence and a conjugate sequence corresponding to the preamble sequence; responding to a label mapping instruction, and determining a label lead code corresponding to the initial lead code according to the initial lead code and the lead index number, wherein a root serial number of the initial lead code corresponds to the lead index number one by one;
The receiving and transmitting module is used for transmitting the tag lead code to a base station, wherein the tag lead code is used for collision detection by the base station to obtain a collision result; receiving the conflict result sent by the base station;
the processing module is further configured to determine an access result according to the collision result.
8. A base station, comprising:
the receiving and transmitting module is used for receiving a label lead code sent by the terminal equipment, wherein the label lead code is obtained by the terminal equipment according to an initial lead code and a lead index number, a root serial number of the initial lead code corresponds to the lead index number one by one, and the initial lead code is determined according to a lead sequence and a conjugate sequence corresponding to the lead sequence;
the processing module is used for carrying out conflict detection on the tag preamble to obtain a conflict result;
the receiving and transmitting module is further configured to send the conflict result to the terminal device, where the conflict result is used for the terminal device to determine an access result.
9. An equipment access system comprising terminal equipment and a base station, characterized in that,
the terminal equipment is used for determining an initial preamble according to the preamble sequence and a conjugate sequence corresponding to the preamble sequence; responding to a label mapping instruction, and determining a label lead code corresponding to the initial lead code according to the initial lead code and the lead index number, wherein a root serial number of the initial lead code corresponds to the lead index number one by one; transmitting the tag preamble to the base station;
The base station is used for receiving the label lead code sent by the terminal equipment; performing conflict detection on the tag preamble to obtain a conflict result; transmitting the conflict result to the terminal equipment;
the terminal equipment is also used for receiving the conflict result sent by the base station and determining an access result according to the conflict result.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the device access method of any of claims 1 to 6 when the program is executed by the processor.
CN202310525625.9A 2023-05-10 2023-05-10 Equipment access method, terminal equipment, base station, system and electronic equipment Pending CN116528390A (en)

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