CN110572863A - system access method of high-frequency Internet of things - Google Patents
system access method of high-frequency Internet of things Download PDFInfo
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- CN110572863A CN110572863A CN201910823317.8A CN201910823317A CN110572863A CN 110572863 A CN110572863 A CN 110572863A CN 201910823317 A CN201910823317 A CN 201910823317A CN 110572863 A CN110572863 A CN 110572863A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- 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 system access method of a high-frequency Internet of things, which comprises the following steps: the second type base station sends the wave beam to the first type base station in a high frequency band, then the first type base station is switched into a dormant state, and the first type base station selects the wave beam with the optimal receiving quality as a positioning wave beam; acquiring a receiving beam direction used when the positioning beam is received according to the positioning beam; the first terminal sends an access pilot frequency to the first type base station through a low frequency band and then switches to a high frequency band communication mode; the first type base station acquires the optimal space beam transmission direction between the first type base station and the first terminal; determining the optimal transmitting beam direction communicated with the second type base station, and activating the second type base station; and the second type base station sends a beam, the first terminal sends an access pilot frequency to the second type base station after receiving the beam, if the response information of the second type base station is not received, the first type base station is switched into a low-frequency band communication mode to communicate with the first type base station, and the first type base station determines the positioning beam again. The invention effectively reduces the energy consumption of the Internet of things.
Description
Technical Field
the invention relates to a network access method, in particular to a system access method of a high-frequency Internet of things.
Background
the 5G can meet diversified business requirements of people in various areas such as residence, work, leisure and traffic, and can provide extremely-sophisticated business experience such as ultra-high-definition video, virtual reality, augmented reality, cloud desktops and online games for users even in scenes with ultra-high traffic density, ultra-high connection number density and ultra-high mobility characteristics such as dense residential areas, offices, stadiums, outdoor gatherings, subways, expressways, high-speed rails and wide area coverage. Meanwhile, 5G can permeate into the fields of the Internet of things and various industries, is deeply integrated with industrial facilities, medical instruments, vehicles and the like, effectively meets the diversified business requirements of the vertical industries such as industry, medical treatment, transportation and the like, and realizes real 'everything interconnection'.
the 5G application scenarios can be divided into two broad categories, namely Mobile Broadband (MBB) and Internet of Things (IoT). Among these, the main technical requirements for mobile broadband access are high capacity, providing high data rates to meet the ever-increasing demand for data services. The internet of things is mainly driven by the requirement of Machine Communication (MTC), and can be further divided into two types, including low-speed Mass Machine Communication (MMC) and low-latency high-reliability Machine Communication. For the low-speed mass machine communication, mass nodes are accessed at a low speed, the transmitted data packets are usually small, the interval time is relatively long, and the cost and the power consumption of the nodes are usually low; for machine communication with low time delay and high reliability, the method is mainly used for machine communication with higher requirements on instantaneity and reliability, such as real-time alarm, real-time monitoring and the like.
in a fifth generation mobile communication system, a scene needing to be researched is an access method in the internet of things using high-frequency-band communication, a common access scheme mainly depends on complex beam search matching, power consumption of an internet of things terminal is seriously increased, and the important problem to be solved by the internet of things system is urgently solved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a system access method of a high-frequency Internet of things.
the invention comprises the following steps:
s101: the method comprises the steps that a second type base station sends a plurality of wave beams to a first type base station in a high frequency band and then shifts to a dormant state, the first type base station selects the wave beam with the optimal receiving quality from the plurality of wave beams as a positioning wave beam, wherein the second type base station is a base station supporting high frequency band communication, and the first type base station is a base station supporting both high frequency band communication and low frequency band communication;
S102: the first type base station acquires a receiving wave beam direction used when receiving the positioning wave beam according to the positioning wave beam;
S103: the first type base station sends and sends low-frequency band access parameter configuration information to a first terminal of a system to be accessed through a low-frequency band;
S104: the first terminal in the low-frequency band communication mode sends an access pilot frequency to the first type base station based on the low-frequency band access parameter configuration information, and then switches to the high-frequency band communication mode;
S105: the first type base station determines the optimal space beam transmission direction of the first type base station and the first terminal according to the access pilot frequency;
s106: the first type base station determines the optimal transmitting beam direction used when communicating with the second type base station according to the optimal space beam transmission direction and the receiving beam direction, and activates the second type base station through the optimal transmitting beam direction by using a high frequency band;
s107: after the second type base station is activated, sending a wave beam carrying high-frequency band access parameter configuration information;
s108: after receiving the wave beam, the first terminal sends an access pilot frequency to the second type base station based on the obtained high-frequency band access parameter information, judges whether response information of the second type base station is received, if so, uses high-frequency band communication with the second type base station, and if not, switches to a low-frequency band communication mode to communicate with the first type base station;
s109: after a first terminal accesses a first type base station, informing the first type base station of failure notification information that the first type base station attempts to access a second type base station but does not succeed;
S110: after receiving the failure notification message, the first type base station re-determines the positioning beam with the second type base station, and then performs step S102.
In a further improvement of the present invention, in step S102, the first type base station measures and stores the SNR1 of the received positioning beam, in step S105, the first type base station measures and stores the SNR2 of the received access pilot, and in step 106, the first type base station activates the second type base station by activation information, wherein the activation information at least includes an absolute value of difference information between the SNR1 and the SNR 2.
The invention is further improved, and the first type base station transfers to low-frequency communication after transmitting the activation information for 15 s.
The present invention further improves, in step S107, after the second-type base station receives the activation information, if the absolute value of the difference information is smaller than the first set value, the second-type base station sends N beams with a beam width of X degrees, and if the absolute value of the difference information is not smaller than the first set value, the second-type base station sends 2N beams with a beam width of X/2 degrees, where N is an integer greater than or equal to 12, and X is an integer greater than 0 and less than or equal to 30, and the high-band access parameter configuration information at least includes the number of times Z that the first terminal sends the access pilot, and Z is an integer greater than or equal to 1.
The invention is further improved, the repetition times Z is related to the beam width, when the beam width is X/2, the value of Z is 3, and when the beam width is X, the value of Z is 6.
in step S105, the method for the first type base station to obtain the optimal spatial beam transmission direction includes: acquiring a first terminal and a low-frequency channel H of the first terminal, performing singular value decomposition on the low-frequency channel H to obtain a right singular vector V corresponding to the maximum singular value, finding the highest discrete Fourier transform vector similar to the right singular vector V by the first type base station, then determining the optimal space beam transmission direction of the first type base station and the first terminal based on the discrete Fourier transform vector,
In step S106, the optimal transmit beam direction is an average value of angle sums of the optimal spatial beam transmission direction and the optimal receive beam direction.
The invention is further improved, the antennas of the first type base station are distributed in a uniform straight line or plane, the second type base station only has one radio frequency channel, and each time can only send or receive a wave beam in one direction.
In step S104, the duration of the low-band transmission of the access pilot is a positive integer multiple of 20ms, and the number of repetitions of the access pilot sequence is a positive integer multiple of 10.
The invention is further improved, the second type base station adopts a solar power supply mode, the beam can be sent based on the activation information sent by the first type base station only when the electric quantity reserve of the second type base station reaches more than 10%, if the electric quantity reserve of the second type base station does not reach 10%, the second type base station sends response information to the first type base station, the first type base station is informed that the electric quantity of the first type base station does not meet the condition of sending the beam, and the first type base station is switched into low-frequency-band communication.
the invention is further improved in that if the first terminal fails to receive the beam after being switched to the high frequency band communication mode for 20s, the first terminal is switched to the low frequency band communication mode.
Compared with the prior art, the invention has the beneficial effects that: the problem of high power consumption of terminal access in the existing Internet of things is solved, and the energy consumption of the Internet of things system is effectively reduced by various low-energy consumption settings, so that the requirement of green communication is met.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
as shown in fig. 1, the present invention comprises the steps of:
S101: the method comprises the steps that a second type base station sends a plurality of wave beams to a first type base station in a high frequency band and then shifts to a dormant state, the first type base station selects the wave beam with the optimal receiving quality from the plurality of wave beams as a positioning wave beam, wherein the second type base station is a base station supporting high frequency band communication, and the first type base station is a base station supporting both high frequency band communication and low frequency band communication;
S102: the first type base station acquires a receiving wave beam direction used when receiving the positioning wave beam according to the positioning wave beam;
S103: the first type base station sends and sends low-frequency band access parameter configuration information to a first terminal of a system to be accessed through a low-frequency band;
s104: the first terminal in the low-frequency band communication mode sends an access pilot frequency to the first type base station based on the low-frequency band access parameter configuration information, and then switches to the high-frequency band communication mode;
S105: the first type base station determines the optimal space beam transmission direction of the first type base station and the first terminal according to the access pilot frequency;
s106: the first type base station determines the optimal transmitting beam direction used when communicating with the second type base station according to the optimal space beam transmission direction and the receiving beam direction, and activates the second type base station through the optimal transmitting beam direction by using a high frequency band;
S107: after the second type base station is activated, sending a wave beam carrying high-frequency band access parameter configuration information;
S108: after receiving the wave beam, the first terminal sends an access pilot frequency to the second type base station based on the obtained high-frequency band access parameter information, judges whether response information of the second type base station is received, if so, uses high-frequency band communication with the second type base station, and if not, switches to a low-frequency band communication mode to communicate with the first type base station;
s109: after a first terminal accesses a first type base station, informing the first type base station of failure notification information that the first type base station attempts to access a second type base station but does not succeed;
S110: after receiving the failure notification message, the first type base station re-determines the positioning beam with the second type base station, and then performs step S102.
specifically, as a preferred embodiment of the present invention, the system access method in this embodiment is:
(1) The second type base station sends Y wave beams to the first type base station in a time division mode in a high frequency band, then the first type base station enters a dormant state, the first type base station selects the wave beam with the optimal receiving quality from the Y wave beams as a positioning wave beam, the first type base station measures and stores the SNR1 of the received positioning wave beam and the receiving wave beam used by the first type base station when the first type base station receives the positioning wave beam, wherein Y is an integer more than 2, the second type base station is a base station supporting high frequency band communication, and the first type base station is a base station supporting both high frequency band communication and low frequency band communication.
(2) The first type base station sends the low-frequency band access parameter configuration information to a first terminal through a low-frequency band, wherein the first terminal supports both a high-frequency band communication mode and a low-frequency band communication mode, and the first terminal can only work in one communication mode at each moment.
(3) and the first terminal in the low-frequency band communication mode sends the access pilot frequency to the first type base station in the low-frequency band based on the low-frequency band access parameter configuration information, and then switches to the high-frequency band communication mode.
(4) the first type base station measures and stores the SNR2 of the received access pilot frequency, the first type base station obtains a first terminal and a low-frequency band channel H of the first type base station based on the access pilot frequency, performs singular value decomposition on the low-frequency band channel H to obtain a right singular vector V corresponding to the maximum singular value, finds a discrete Fourier transform vector (for example, in an inner product mode) which is most similar to the right singular vector V, and then determines the optimal space beam transmission direction of the first type base station and the first terminal based on the discrete Fourier transform vector.
(5) the first type base station determines an optimal transmitting beam direction used when communicating with the second type base station according to the optimal space beam transmitting direction and the optimal receiving beam direction, and transmits activation information to the second type base station through the optimal transmitting beam by using a high frequency band, wherein the optimal transmitting beam direction is an average value of angles and values of the optimal space beam transmitting direction and the optimal receiving beam direction, and the activation information at least comprises an absolute value of difference information of SNR1 and SNR 2. In the embodiment, only the second type base station within the coverage range of the optimal space beam transmission direction is activated, so that the power consumption of the whole wireless communication system is reduced.
(6) After the second type base station receives the activation information, if the absolute value of the difference information is within the range of 5dB, the second type base station sends N beams with the beam width of X degrees, and if the absolute value of the difference information is outside the range of 5dB, the second type base station sends 2N beams with the beam width of X/2 degrees, where N is an integer greater than or equal to 12, X is an integer greater than 0 and less than or equal to 30, the beams carry high-band access parameter configuration information, the high-band access parameter configuration information at least includes the number of times Z of repetition of sending an access pilot by the first terminal, and Z is an integer greater than or equal to 1.
the advantage of determining the number of beams and the angle based on the absolute value of the difference information is that when the absolute value of the difference information is less than or equal to a specific threshold, it indicates that the second-type base station and the first terminal are located relatively close to each other, and therefore the transmission beam is not spread particularly widely, so that the first terminal can be ensured to successfully receive the transmission beam with a high probability using relatively few and relatively narrow transmission beams, and when the absolute value of the difference information is greater than the specific threshold, it indicates that the second-type base station and the first terminal are located relatively far away from each other, and therefore the transmission beam may be spread widely, and therefore the first terminal can be ensured to successfully receive the transmission beam with a high probability using relatively many and relatively wide transmission beams.
(7) The first terminal tries to receive the wave beam to obtain the high-frequency band access parameter configuration information, and the first terminal repeatedly sends the access pilot frequency to the second type base station for Z times based on the obtained high-frequency band access parameter information.
(8) If the first terminal does not receive the response information of the second type base station after repeatedly sending the access pilot frequency to the second type base station for Z times, the first terminal is switched into a low frequency band communication mode to communicate with the first type base station; this has the advantage of enabling the terminal to quickly switch to low band mode to obtain service from the system when high band communication is not available.
(9) After the first terminal accesses the first type base station, the first terminal informs the first type base station that the first type base station attempts to access the second type base station but fails to successfully notify the information, so that the first type base station can know that a link between the first type base station and the second type base station possibly has a problem, and measures can be taken to quickly recover the relevant link.
(10) And after receiving the failure notification information, the first type base station re-determines the positioning wave beam between the first type base station and the second type base station.
Example 2
On the basis of the embodiment 1, when the second type base station is in the dormant state, only a part of the time window receives the state that the first type base station transmits information. This has the advantage that the power consumption of the second type base station can be reduced as much as possible to meet the "green" communication requirements.
Example 3
In addition to the embodiment 1, the duration of the access pilot transmitted by the first terminal in the low frequency band is positive integer times of 20ms, and the number of times of repetition of the access pilot sequence included is positive integer times of 10. This has the advantage that the first type base station receives the access pilot with high quality as much as possible, so that subsequent angle estimation and the like can be better performed.
Example 4
based on embodiment 1, the antennas of the first type base station are uniformly distributed in a straight line or in a plane, which has the advantage that the discrete fourier transform vector can be used for optimal transmission beam angle matching.
Example 5
On the basis of the embodiment 1, the second type base station has only one radio frequency channel, and can only transmit or receive beams in one direction at each moment. The reason for this is that the cost of the second type base station needs to be reduced as much as possible, since analog-to-digital and digital-to-analog conversion devices for high frequencies are very expensive.
example 6
On the basis of the embodiment 1, the second type base station adopts a solar power supply mode, and the beam can be transmitted based on the activation information transmitted by the first type base station only when the electric quantity reserve reaches more than 10%. The advantage of doing so is satisfying "green" communication demand while, preferentially ensure the basic work electric quantity demand of second type basic station, avoid the problem that maintenance cost increases by a wide margin because the electric quantity exhausts.
And if the electric quantity reserve of the second type base station cannot reach 10%, the second type base station sends response information to the first type base station to inform the first type base station that the electric quantity of the first type base station does not meet the condition of sending the wave beam, and the first type base station switches to low-frequency-band communication. This has the advantage that in such a case the first terminal may not be able to use the high frequency band for subsequent communication, which subsequently needs to communicate with the first type base station via the low frequency band.
Example 7
On the basis of embodiment 1, if the first terminal fails to receive the beam after shifting to the high band communication mode for 20s, the first terminal shifts to the low band communication mode. This has the advantage that the terminal can eventually be served from the low band communication mode.
Example 8
on the basis of the embodiment 1, the first type base station switches to low-frequency band communication after sending the activation information 15 s. This has the advantage of avoiding the problem that the system cannot continue to provide service to the first terminal after it cannot communicate using the high frequency band.
Example 9
on the basis of embodiment 1, the number of times of repetition Z is related to the beam width, and when the beam width is X/2, Z takes a value of 3, and when the beam width is X, Z takes a value of 6. The reason for this is that the narrower the beam, which means that the second type base station considers that the closer the first terminal is to itself, the better the communication quality, and therefore a better access pilot quality can be obtained with a smaller number of repetitions, and vice versa.
It is to be noted that the above-mentioned embodiments can be combined with several or all of them without departing from the technical scope.
The above-described embodiments are intended to be illustrative, and not restrictive, of the invention, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A system access method of a high-frequency Internet of things is characterized by comprising the following steps:
S101: the method comprises the steps that a second type base station sends a plurality of wave beams to a first type base station in a high frequency band and then shifts to a dormant state, the first type base station selects the wave beam with the optimal receiving quality from the plurality of wave beams as a positioning wave beam, wherein the second type base station is a base station supporting high frequency band communication, and the first type base station is a base station supporting both high frequency band communication and low frequency band communication;
S102: the first type base station acquires a receiving wave beam direction used when receiving the positioning wave beam according to the positioning wave beam;
S103: the first type base station sends and sends low-frequency band access parameter configuration information to a first terminal of a system to be accessed through a low-frequency band;
S104: the first terminal in the low-frequency band communication mode sends an access pilot frequency to the first type base station based on the low-frequency band access parameter configuration information, and then switches to the high-frequency band communication mode;
s105: the first type base station determines the optimal space beam transmission direction of the first type base station and the first terminal according to the access pilot frequency;
S106: the first type base station determines the optimal transmitting beam direction used when communicating with the second type base station according to the optimal space beam transmission direction and the receiving beam direction, and activates the second type base station through the optimal transmitting beam direction by using a high frequency band;
S107: after the second type base station is activated, sending a wave beam carrying high-frequency band access parameter configuration information;
S108: after receiving the wave beam, the first terminal sends an access pilot frequency to the second type base station based on the obtained high-frequency band access parameter information, judges whether response information of the second type base station is received, if so, uses high-frequency band communication with the second type base station, and if not, switches to a low-frequency band communication mode to communicate with the first type base station;
s109: after a first terminal accesses a first type base station, informing the first type base station of failure notification information that the first type base station attempts to access a second type base station but does not succeed;
s110: after receiving the failure notification message, the first type base station re-determines the positioning beam with the second type base station, and then performs step S102.
2. The system access method of the high-frequency internet of things of claim 1, characterized in that: in step S102, the first type base station measures and stores SNR1 of the received positioning beam, in step S105, the first type base station measures and stores SNR2 of the received access pilot, and in step S106, the first type base station activates the second type base station by activation information, wherein the activation information at least comprises an absolute value of difference information between SNR1 and SNR 2.
3. The system access method of the high-frequency internet of things as claimed in claim 2, wherein: and the first type base station switches to low-frequency communication after sending the activation information for 15 s.
4. The system access method of the high-frequency internet of things as claimed in claim 2, wherein: in step S107, after the second type base station receives the activation information, if the absolute value of the difference information is smaller than the first set value, the second type base station transmits N beams with a beam width of X degrees, and if the absolute value of the difference information is not smaller than the first set value, the second type base station transmits 2N beams with a beam width of X/2 degrees, where N is an integer greater than or equal to 12, X is an integer greater than 0 and less than or equal to 30, the high-band access parameter configuration information at least includes a repetition number Z of times that the first terminal transmits the access pilot, and Z is an integer greater than or equal to 1.
5. The system access method of the high-frequency Internet of things as claimed in claim 4, wherein: the number of repetitions Z is related to the beam width, and when the beam width is X/2, the value of Z is 3, and when the beam width is X, the value of Z is 6.
6. the system access method of the high-frequency internet of things as claimed in any one of claims 1 to 5, wherein: in step S105, the method for the first type base station to obtain the optimal spatial beam transmission direction includes: acquiring a first terminal and a low-frequency channel H of the first terminal, performing singular value decomposition on the low-frequency channel H to obtain a right singular vector V corresponding to the maximum singular value, finding the highest discrete Fourier transform vector similar to the right singular vector V by the first type base station, then determining the optimal space beam transmission direction of the first type base station and the first terminal based on the discrete Fourier transform vector,
In step S106, the optimal transmit beam direction is an average value of angle sums of the optimal spatial beam transmission direction and the optimal receive beam direction.
7. The system access method of the high-frequency internet of things as claimed in any one of claims 1 to 5, wherein: the antennas of the first type base station are uniformly distributed in a straight line or in a plane, the second type base station only has one radio frequency channel, and only one beam in one direction can be sent or received at each moment.
8. The system access method of the high-frequency internet of things as claimed in any one of claims 1 to 5, wherein: in step S104, the duration of the low-band access pilot transmission is a positive integer multiple of 20ms, and the number of times of access pilot sequence repetition included is a positive integer multiple of 10.
9. The system access method of the high-frequency internet of things as claimed in any one of claims 1 to 5, wherein: the second type base station adopts a solar power supply mode, only when the electric quantity reserve reaches more than 10%, the beam can be sent based on the activation information sent by the first type base station, if the electric quantity reserve of the second type base station fails to reach 10%, the second type base station sends response information to the first type base station, the first type base station is informed that the electric quantity of the first type base station does not meet the condition of sending the beam, and the first type base station is switched into low-frequency-band communication.
10. the system access method of the high-frequency internet of things as claimed in any one of claims 1 to 5, wherein: and if the first terminal fails to receive the beam after being switched into the high-frequency-band communication mode for 20s, the first terminal is switched into the low-frequency-band communication mode.
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| CN114786192A (en) * | 2022-05-13 | 2022-07-22 | 中国联合网络通信集团有限公司 | Beam selection method, access network equipment and storage medium |
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