CN110602797B - Access method in Internet of things - Google Patents
Access method in Internet of things Download PDFInfo
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- CN110602797B CN110602797B CN201910823288.5A CN201910823288A CN110602797B CN 110602797 B CN110602797 B CN 110602797B CN 201910823288 A CN201910823288 A CN 201910823288A CN 110602797 B CN110602797 B CN 110602797B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
- H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
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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
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
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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
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- 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
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
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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 an access method in the Internet of things, and belongs to the field of wireless communication. The invention comprises the following steps: the second type base station enters a dormant state after sending position information to the first type base station; the first type base station sends low-frequency band access parameter configuration information to a first terminal; the first terminal sends an access pilot frequency to the first type base station in a low frequency band, and the first terminal is switched into 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; activating a second type base station in the optimal space beam transmission direction according to the optimal space beam transmission direction and the position information; the second type base station sends a wave beam carrying high-frequency band access parameter configuration information; after receiving the wave beam, the first terminal sends an access pilot frequency to the second type base station; and if the response information of the second type base station is not received, switching to a low-frequency band communication mode to communicate with the first type base station. The invention reduces the energy consumption of the Internet of things system.
Description
Technical Field
The invention relates to a network access method, in particular to an access method in the Internet of things with low energy consumption.
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 an access method in the Internet of things.
The invention comprises the following steps:
s101: the method comprises the steps that a second type base station sends position information to a first type base station and then enters a dormant state, 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 measures and stores the signal-to-noise ratio SNR1 of the received position information, and then sends the low-frequency band access parameter configuration information to the first terminal through the low-frequency band;
s103: the first terminal in the low-frequency band communication mode sends an 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 the first terminal is switched into the high-frequency band communication mode;
s104: the first type base station measures and stores the SNR2 of the received access pilot frequency, and obtains the optimal space beam transmission direction of the first type base station and the first terminal based on the access pilot frequency;
s105: the first type base station determines a second type base station in the optimal space beam transmission direction according to the optimal space beam transmission direction and the position information, and transmits activation information to the second type base station in a beam mode by using a high frequency band, wherein the activation information at least comprises an absolute value of difference information between SNR1 and SNR 2;
s106: after receiving the activation information, the second type base station sends a wave beam carrying high-frequency band access parameter configuration information, wherein the high-frequency band access parameter configuration information at least comprises the repetition times Z of the access pilot frequency sent by the first terminal, and the Z is an integer larger than or equal to 1;
s107: the first terminal tries to receive the wave beam, obtains high-frequency band access parameter configuration information, and repeatedly sends access pilot frequency to the second type base station for Z times based on the obtained high-frequency band access parameter information;
s108: and 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.
In a further improvement of the present invention, the first terminal is a terminal that supports both the high-band communication mode and the low-band communication mode, and the first terminal can only operate in one communication mode at each moment.
In step S104, the first type base station obtains the first terminal and its own low-frequency channel H based on the access pilot, performs singular value decomposition on the low-frequency channel H to obtain a right singular vector V corresponding to a maximum singular value, then finds a discrete fourier transform vector with the highest similarity to the right singular vector V, and finally determines the optimal spatial beam transmission direction between the first type base station and the first terminal based on the discrete fourier transform vector.
In step S106, if the absolute value of the difference information is within the threshold range, the second type base station transmits N beams with a beam width of X degrees, and if the absolute value of the difference information exceeds the threshold, 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, and X is an integer greater than 0 and less than or equal to 30.
The invention is further improved, and the threshold value is 5 dB.
In a further improvement of the present invention, the antennas of the first type base station are uniformly distributed in a straight line or in a plane.
The invention is further improved, the second type base station only has one radio frequency channel, and can only send or receive beams in one direction at each moment.
The invention is further improved, the second type base station adopts a solar power supply mode, the beam can be transmitted based on the activation information transmitted 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 fails to reach 10%, the second type base station transmits 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 transmitting the beam, and the first type base station is switched into low-frequency-band communication.
The invention is further improved, if the first terminal is switched to the high frequency band communication mode and cannot successfully receive the wave beam within the set time, the first terminal is switched to the low frequency band communication mode, and the first type base station is switched to the low frequency band communication after sending the activation information for a certain time.
In step S103, the duration of the access pilot sent by the first terminal in the low frequency band is positive integer times of the first setting value, and the number of times of repetition of the access pilot sequence included in the access pilot sequence is positive integer times of the second setting value.
Compared with the prior art, the invention has the beneficial effects that: and only the second type base station within the coverage range of the optimal space beam transmission direction is activated through the position information and the optimal space beam transmission direction, so that the power consumption of the whole wireless communication system is effectively reduced, and 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, as an embodiment of the present invention, the present invention includes the steps of:
step S101: the second type base station sends position information to the first type base station, and then enters a dormant state, 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.
The dormant state of the second type base station in this example is a state in which only a part of the time window receives information transmitted by the first type base station. 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.
Step S102: the first type base station measures and stores the SNR1 of the received location information and then sends the configuration information of the low band access parameters to the first terminal through the low band, the first terminal in this example being a terminal that supports both the high band communication mode and the low band communication mode, and the first terminal being capable of operating in only one communication mode at each moment.
In this example, the duration of the access pilot frequency transmitted in the low frequency band is positive integer times of 20ms, and the number of times of repetition of the access pilot frequency sequence included in the access pilot frequency sequence 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. In addition, other values may be selected.
Step S103: 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 the first terminal is switched into the high-frequency band communication mode.
Step S104: the first type base station measures and stores the SNR2 of the received access pilot, and obtains the optimal space beam transmission direction of the first type base station and the first terminal based on the access pilot.
As an embodiment of the present invention, the method for acquiring the optimal spatial beam transmission direction in this embodiment is:
and the first type base station acquires a low-frequency channel H of the first type base station and a first terminal based on the access pilot frequency, performs singular value decomposition on the low-frequency channel H to obtain a right singular vector V corresponding to a maximum singular value, then finds a discrete Fourier transform vector with the highest similarity with the right singular vector V, and finally determines the optimal space beam transmission direction of the first type base station and the first terminal based on the discrete Fourier transform vector.
Step S105: and the first type base station determines a second type base station in the optimal space beam transmission direction according to the optimal space beam transmission direction and the position information, and transmits activation information to the second type base station in a beam mode by using a high frequency band, wherein the activation information at least comprises an absolute value of difference information between SNR1 and SNR 2. This has the advantage that only base stations of the second type within the coverage area of the most spatial beam transmission direction are activated, thereby reducing the power consumption of the overall wireless communication system.
Preferably, in this embodiment, after the first type base station transmits the activation information 15s, the first type base station switches to low frequency band communication, so as to avoid the problem that the system cannot continue to provide service for the first terminal after the first terminal cannot use the high frequency band for communication.
Step S106: and after receiving the activation information, the second type base station sends a wave beam carrying high-frequency band access parameter configuration information, wherein the high-frequency band access parameter configuration information at least comprises the repetition times Z of the access pilot frequency sent by the first terminal, and the Z is an integer larger than or equal to 1.
Preferably, if the absolute value of the difference information is within a range of 5dB, the second-type base station transmits N beams with a beam width of X degrees, and if the absolute value of the difference information exceeds a threshold, 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, and X is an integer greater than 0 and less than or equal to 30. The threshold value of this example may be set to other values based on the number of access terminals, etc.
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.
Step S107: the first terminal tries to receive the wave beam, obtains the high-frequency band access parameter configuration information, and 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.
As an embodiment of the present invention, the number of times Z of repetition in this example depends on 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.
Preferably, if the first terminal is switched to the high frequency band communication mode and fails to receive the beam after 20s, the first terminal is switched to the low frequency band communication mode, and the first type base station is switched to the low frequency band communication after sending the activation information for a certain time. This has the advantage that the terminal can eventually be served from the low band communication mode.
Step S108: and 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.
As another embodiment of the present invention, the antennas of the first type base station of this example are uniformly distributed in a straight line or in a plane. This has the advantage that the discrete fourier transform vector can be used for optimal transmit beam angle matching.
The second type of base station in this example has only one radio frequency channel and can only transmit or receive beams in one direction at each time. The reason for this is that the cost of the second type base station can be reduced as much as possible while the power consumption is reduced in this example because the analog-to-digital and digital-to-analog conversion devices for high frequencies are very expensive.
The invention is further improved, 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, informs 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 switches the first type base station into 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.
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 (9)
1. An access method in the Internet of things is characterized by comprising the following steps:
s101: the method comprises the steps that a second type base station sends position information to a first type base station and then enters a dormant state, 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 measures and stores the signal-to-noise ratio SNR1 of the received position information, and then sends the low-frequency band access parameter configuration information to the first terminal through the low-frequency band;
s103: the first terminal in the low-frequency band communication mode sends an 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 the first terminal is switched into the high-frequency band communication mode;
s104: the first type base station measures and stores the SNR2 of the received access pilot frequency, and obtains the optimal space beam transmission direction of the first type base station and the first terminal based on the access pilot frequency;
s105: the first type base station determines a second type base station in the optimal space beam transmission direction according to the optimal space beam transmission direction and the position information, and transmits activation information to the second type base station in a beam mode by using a high frequency band, wherein the activation information at least comprises an absolute value of difference information between SNR1 and SNR 2;
s106: after receiving the activation information, the second type base station sends a wave beam carrying high-frequency band access parameter configuration information, wherein the high-frequency band access parameter configuration information at least comprises the repetition times Z of the access pilot frequency sent by the first terminal, and the Z is an integer larger than or equal to 1;
s107: the first terminal tries to receive the wave beam, obtains high-frequency band access parameter configuration information, and repeatedly sends access pilot frequency to the second type base station for Z times based on the obtained high-frequency band access parameter information;
s108: and 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.
2. The access method in the internet of things as claimed in claim 1, 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. The access method in the internet of things as claimed in claim 1, wherein: in step S104, the first type base station obtains the first terminal and its own low-frequency channel H based on the access pilot, performs singular value decomposition on the low-frequency channel H to obtain a right singular vector V corresponding to a maximum singular value, then finds a discrete fourier transform vector having a highest similarity with the right singular vector V, and finally determines an optimal spatial beam transmission direction between the first type base station and the first terminal based on the discrete fourier transform vector.
4. The access method in the internet of things as claimed in claim 2, wherein: in step S106, if the absolute value of the difference information does not exceed the threshold, which indicates that the second-type base station and the first terminal are located closer together, the second-type base station transmits N beams with a beam width of X degrees, and if the absolute value of the difference information exceeds the threshold, which indicates that the second-type base station and the first terminal are located farther apart, 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, and X is an integer greater than 0 and less than or equal to 30.
5. The access method in the internet of things as claimed in claim 4, wherein: the threshold is 5 dB.
6. The access method in the internet of things according to any one of claims 1 to 5, wherein: the antennas of the first type base station are distributed in a uniform straight line or in a plane.
7. The access method in the internet of things according to any one of claims 1 to 5, wherein: the second type base station only has one radio frequency channel, and can only send or receive beams in one direction at each moment.
8. The access method in the internet of things according to 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.
9. The access method in the internet of things according to any one of claims 1 to 5, wherein: and if the first terminal is switched into the high-frequency-band communication mode and cannot successfully receive the wave beam within the set time, the first terminal is switched into the low-frequency-band communication mode, and the first type base station is switched into low-frequency-band communication after sending the activation information for a certain time.
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| CN106851560A (en) * | 2016-12-30 | 2017-06-13 | 上海无线通信研究中心 | A kind of method for building up of high-frequency communication link, system and electronic equipment |
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