CN107438287B - Wireless channel selection method, device and system for metropolitan area Internet of things node - Google Patents

Wireless channel selection method, device and system for metropolitan area Internet of things node Download PDF

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CN107438287B
CN107438287B CN201610362799.8A CN201610362799A CN107438287B CN 107438287 B CN107438287 B CN 107438287B CN 201610362799 A CN201610362799 A CN 201610362799A CN 107438287 B CN107438287 B CN 107438287B
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metropolitan area
channel
things node
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CN107438287A (en
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徐伯星
何春舅
韩朝相
王新安
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Peking University Shenzhen Graduate School
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource

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Abstract

A wireless channel selection method, device and system for a metropolitan area Internet of things node comprises the following steps: receiving base station broadcast information through a first channel, wherein the base station broadcast information is used for representing the state of each transceiver module in a base station; recommending and evaluating each transceiver module according to the base station broadcast information to obtain a recommendation and evaluation result; and selecting at least one transceiver module in each transceiver module according to the evaluation result to establish a second channel. Therefore, the metropolitan area Internet of things node can select a proper base station transceiving module and establish a second channel according to the recommendation evaluation result. And a plurality of node modules are utilized to avoid conflict when selecting the second channel, thereby realizing the optimal distribution and the efficient multiplexing of the base station transceiver module channel.

Description

Wireless channel selection method, device and system for metropolitan area Internet of things node
Technical Field
The invention relates to the field of communication, in particular to a wireless channel selection method, a wireless channel selection device and a wireless channel selection system for a metropolitan area Internet of things node.
Background
The internet of things is widely applied to network fusion through communication perception technologies such as intelligent perception, identification technology and pervasive computing, is the third wave of development of the world information industry after computers and the internet, and is one of the current key problems of how to realize real-time acquisition, connection, monitoring and interaction in a long distance, low delay and low power consumption manner.
Currently, the mainstream wireless sensor network adopts the Zigbee technology, and short-distance wireless communication with low speed and low power consumption is well realized, but because of the limitation of the modulation mode, the reliable transmission distance of the signal is generally not more than 100 meters. Although the coverage can be extended by a mesh networking mode, the greatest disadvantage of the ad hoc networking mode is that: the complicated topology management, data routing and multi-hop transmission modes inevitably cause that the power consumption of full-function nodes in the sensing network cannot be reduced to be very low. The battery powered time support of a typical node lasts several months to a year or two, while more applications urgently require longer transmission distances and lower battery life.
LoRa is a new wireless signal modulation technique introduced by the company of alt (semtech) in 2013, month 10, which has lower power consumption and larger transmission distance than the conventional wireless signal modulation technique. By adopting the radio frequency chip integrating the technology, long-distance communication under the constraint of extremely low power consumption can be realized. According to the manufacturer data, the transmission distance of the LoRa modulation chip in an open area can reach 15 kilometers, and the coverage range of 1-5 kilometers can be reached even in a downtown area. The development of wireless transmission technology makes it possible to realize a wide-range and large-scale wireless sensor network. By means of a cellular networking mode, the wireless sensor network in a metropolitan area range can be realized, and the wide-range movement of the wireless sensor nodes can be realized.
The wireless sensor network has the following characteristics in communication: the data transmitted by the network cable sensing network is very limited, so that a low-rate wireless communication transmission mode is usually adopted between the wireless sensor node and the gateway; due to strict low power consumption constraint, the wireless sensor network node is generally powered by a battery, so that the requirement on power consumption is strict; the node capacity is large, each internet of things cell needs to accommodate a large number of wireless sensor nodes, and the nodes are often only needed for long-period and small-quantity data transmission.
Therefore, a cellular network protocol for a high-speed and broadband network cannot be directly applied to a cellular network of the internet of things, and a set of internet of things cellular networking special protocol meeting wireless internet of things networking needs to be realized. Without perfect signaling and complex interactive negotiation mechanisms, how to realize channel allocation and multiplexing between a wireless node and a gateway (base station) becomes a problem to be solved urgently.
Disclosure of Invention
The application provides a wireless channel selection method, device and system for a metropolitan area Internet of things node, which are used for realizing selection and channel establishment of a base station transceiver module by the metropolitan area Internet of things node and realizing distribution and multiplexing of the base station transceiver module channel.
According to a first aspect, an embodiment provides a wireless channel selection method for a metro internet of things node, including:
receiving base station broadcast information through a first channel, wherein the base station broadcast information is used for representing the state of each transceiver module in a base station; recommending and evaluating each transceiver module according to the base station broadcast information to obtain a recommendation and evaluation result; and selecting at least one transceiver module in each transceiver module according to the evaluation result to establish a second channel.
According to a second aspect, an embodiment provides a wireless channel selection apparatus for a metro area internet of things node, including:
the broadcast information receiving module is used for receiving base station broadcast information through a first channel, and the base station broadcast information is used for representing the state of each transceiver module in the base station; the recommendation evaluation module is used for performing recommendation evaluation on each transceiver module according to the base station broadcast information to obtain a recommendation evaluation result; and the second channel establishing module is used for selecting at least one transceiving module in each transceiving module according to the evaluation result so as to establish a second channel.
According to a third aspect, an embodiment provides a wireless channel selection system for a metro internet of things node, including:
a base station broadcast module acquires the state of each transceiver module in a base station; the base station broadcasting module broadcasts broadcasting information to the metropolitan area Internet of things nodes, and the broadcasting information is used for the state of each transceiving module; the metropolitan area Internet of things node carries out recommendation evaluation on each transceiver module according to the base station broadcast information to obtain a recommendation evaluation result; and the metropolitan area Internet of things node selects at least one transceiving module from the transceiving modules according to the evaluation result and establishes a second channel with the transceiving module.
According to the method, the device and the system for selecting the wireless channel of the metropolitan area internet of things node, the base station broadcast information represents the state of each transceiver module in the base station, and recommendation evaluation is performed on each transceiver module according to the base station broadcast information to obtain a recommendation evaluation result, so that the metropolitan area internet of things node can select a proper transceiver module according to the recommendation evaluation result and establish a second channel, and channel allocation and multiplexing of the transceiver module are realized.
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Fig. 1 is a schematic structural diagram of a wireless channel selection system of a metropolitan area internet of things node disclosed in this embodiment;
fig. 2 is a schematic structural diagram of a wireless channel selection device of a metropolitan area internet of things node disclosed in this embodiment;
fig. 3 is a flowchart of a wireless channel selection method for a metropolitan area internet of things node disclosed in this embodiment;
fig. 4 is a flowchart of a method for selecting a wireless channel optimization of a metro internet of things node disclosed in this embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
Referring to fig. 1, a schematic structural diagram of a wireless channel selection system for a metropolitan area internet of things node disclosed in this embodiment is shown, where the wireless channel selection system for the metropolitan area internet of things node includes: the system comprises a base station 1 and a plurality of metropolitan area internet of things nodes 2, wherein the base station 1 comprises a base station broadcasting module 11 and a plurality of transceiving modules 12, each transceiving module 12 is provided with a transceiving interface (shown as S/R in figure 1) for data interaction, and each metropolitan area internet of things node 2 is also provided with a transceiving interface (shown as S/R in figure 1) for data interaction.
In this embodiment, the base station broadcasting module 11 obtains the status of each transceiver module 12 in the base station 1; the base station broadcasting module 11 broadcasts broadcasting information to the metropolitan area internet of things node 2, wherein the broadcasting information is used for representing the state of each transceiving module 12; the metropolitan area Internet of things node 2 carries out recommendation evaluation on each transceiver module 12 according to the base station broadcast information to obtain a recommendation evaluation result; the metropolitan area internet of things node 2 selects at least one transceiving module 12 of the transceiving modules 12 according to the evaluation result and establishes a second channel with the transceiving module 12, so that wireless data interaction is realized.
In order to implement the receiving, recommending, evaluating, and the like of the information of the node 2 of the metropolitan area internet of things, this embodiment also discloses a wireless channel selection device of the node of the metropolitan area internet of things, please refer to fig. 2, which is a schematic structural diagram of the wireless channel selection device of the node of the metropolitan area internet of things, and the wireless channel selection device of the node of the metropolitan area internet of things includes: a broadcast information receiving module 21, a recommendation evaluation module 22 and a second channel establishing module 23, wherein:
the broadcast information receiving module 21 is configured to receive base station broadcast information through a first channel, where the base station broadcast information is used to characterize states of each transceiver module in a base station; the recommendation evaluation module 22 is configured to perform recommendation evaluation on each transceiver module according to the base station broadcast information to obtain a recommendation evaluation result; the second channel establishing module 23 is configured to select at least one transceiver module of the transceiver modules according to the evaluation result to establish a second channel.
In a preferred embodiment, the wireless channel selecting apparatus of the metro internet of things node further includes: the attribute obtaining module 24, the state obtaining module 24 is configured to obtain an attribute of a metropolitan area internet of things node; and the recommendation evaluation module is used for performing recommendation evaluation on each transceiver module according to the base station broadcast information and the attributes of the metropolitan area Internet of things nodes to obtain a recommendation evaluation result.
The embodiment also discloses a method for selecting a wireless channel of a node of the metropolitan area internet of things, please refer to fig. 3, which is a flowchart of the method for selecting a wireless channel of the node of the metropolitan area internet of things, and the method for selecting a wireless channel of the node of the metropolitan area internet of things comprises the following steps:
step 100, receiving base station broadcast information through a first channel. In this embodiment, the base station broadcast information is used to characterize the status of each transceiver module in the base station, specifically, please refer to L1 in fig. 1 as a first channel, and the first channel L1 may be a communication channel for unidirectional transmission. In a specific embodiment, the states of the transceiver modules include, as needed: in a specific embodiment, please refer to fig. 1, a second channel L2 is a channel for performing uplink and downlink communication between the metro internet of things node 2 and the transceiving module 12, and of course, the second channel L2 may also be wireless; when the base station 1 has N transceiver modules, each transceiver module and any one of the metro internet of things nodes can establish N second channels, where N is an integer greater than 1.
And 200, performing recommendation evaluation on each transceiver module according to the base station broadcast information. In this embodiment, after recommendation evaluation is performed on each transceiver module, a recommendation evaluation result can be obtained.
And 300, selecting at least one transceiving module in each transceiving module according to the evaluation result to establish a second channel, so as to realize wireless data interaction between the metropolitan area Internet of things node and the transceiving module.
In a specific embodiment, before performing step 200, the following steps may be further included:
and step 400, acquiring the attribute of the metropolitan area Internet of things node. In a specific embodiment, the attributes of the metro internet of things node may include, as needed: and any one or any combination of the priority p and the data transmission quantity o of the metro internet of things node. In step 200, recommendation evaluation may be performed on each transceiver module according to the base station broadcast information and the attributes of the metro internet of things nodes to obtain a recommendation evaluation result.
In a preferred embodiment, after obtaining the attributes of the metro internet of things node, when performing step 200, the method includes: calculating a recommendation index f established by the current metropolitan area Internet of things node and each second channel, wherein the recommendation index f can be calculated by adopting a preset function: f (r, q, p, o), although in a preferred embodiment, other dependent variables may be introduced when calculating the recommendation index f, and the dependent variables in the above formula may be reduced as appropriate. The method comprises the steps that a recommendation index of an ith second channel is established by a current metropolitan area Internet of things node according to the attribute of the current metropolitan area Internet of things node and the state of a transceiving module corresponding to the ith second channel, wherein i is an integer and is more than or equal to 1 and less than or equal to N; then, generating a random number s of the current metropolitan area Internet of things node between the intervals [0, M ]; and finally, determining a second channel selected by the current metropolitan area Internet of things node according to the random number s.
In an embodiment, after calculating the recommendation index established by the current metro internet of things node and each second channel, please refer to fig. 4, further including:
step 210, normalizing each recommendation index to obtain normalized recommendation index fi. Specifically, as an example, normalization may be performed in the following manner, fi＝fi/(f1+f2+f3+……+fn) So that after normalization f1+f2+f3+……+f n1, wherein fiAnd normalizing the recommended index for the ith second channel.
The step of determining the second channel selected by the current metropolitan area internet of things node according to the random number s comprises the following steps:
step 220, determining the range of the random number s.
Step 230, selecting a second channel according to the affiliated interval. In a specific embodiment, when the random number s belongs to the interval
Figure BDA0001000980670000051
When the current metropolitan area Internet of things node is determined to select to establish a kth second channel, wherein k is more than or equal to 1 and less than or equal to N; when the random number s belongs to the interval [0, f1*M]And then determining that the current metropolitan area Internet of things node selects to establish the 1 st second channel. As an example, the random number s falls in the interval (0, f)1M), then channel 1 is selected; the random number s falls within, for example, the interval (f)1,(f1+f2) M) then channel 2 is selected; the random number s falls in, for example, the interval ((f)1+f2)*M,(f1+f2+f3) M), channel 3 is selected, falling on ((f)1+f2+…+fk-1)*M,(f1+f2+…+fk) M) then select channel k.
In a preferred embodiment, after determining the second channel selected by the current metro internet of things node according to the random number s, the method further includes:
step 240, determine whether the selected second channel is successfully established. Specifically, whether the current metropolitan area internet of things node and the selected second channel are established successfully is judged. If the establishment fails, the random number s of the current metropolitan area internet of things node is regenerated between the intervals [0, M ], and the step 220 is returned to, namely: the selected second channel is re-determined based on the re-generated random number. And if the establishment is successful, finishing the second channel selection, carrying out data communication and the like.
The base station broadcast information represents the state of each transceiver module in the base station, and the recommendation evaluation result is obtained by performing recommendation evaluation on each transceiver module according to the base station broadcast information, so that the metropolitan area internet of things node can select a proper transceiver module and establish a second channel according to the recommendation evaluation result. And a plurality of node modules are utilized to avoid conflict when selecting the second channel, thereby realizing the optimal distribution and the efficient multiplexing of the channel of the transceiving module.
The method, the device and the system for selecting the wireless channel of the metropolitan area internet of things node have the characteristics of low bandwidth, low cost, ultra-low power consumption communication protocol, ultra-large range coverage, less base station requirements and the like.
Those skilled in the art will appreciate that all or part of the steps of the various methods in the above embodiments may be implemented by instructions associated with hardware via a program, which may be stored in a computer-readable storage medium, and the storage medium may include: read-only memory, random access memory, magnetic or optical disk, and the like.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims (6)

1. A wireless channel selection method for a metropolitan area Internet of things node is characterized by comprising the following steps:
receiving base station broadcast information through a first channel, wherein the base station broadcast information is used for representing the state of each transceiver module in a base station;
acquiring the attribute of a metropolitan area Internet of things node;
calculating a recommendation index established by the current metropolitan area Internet of things node and each second channel according to the base station broadcast information and the attributes of the metropolitan area Internet of things node, wherein the recommendation index established by the current metropolitan area Internet of things node and each second channel is calculated according to the attributes of the current metropolitan area Internet of things node and the states of base station transceiving modules corresponding to the ith second channel, i is an integer, i is more than or equal to 1 and less than or equal to N, the number of each transceiving module is N, and N is an integer larger than 1; the number of the metropolitan area Internet of things nodes is multiple, and N second channels can be established between each transceiver module and any one of the metropolitan area Internet of things nodes one by one;
normalizing each recommendation index to obtain normalized recommendation index (f)i)；
Generating a random number(s) of the current metropolitan area Internet of things node between intervals [0, M ], wherein M is a number larger than 0;
determining the section to which the random number(s) belongs when the random number(s) belongs
Figure FDA0002772998040000011
Then, determining that the current metropolitan area Internet of things node selects to establish a kth second channel, wherein k is more than or equal to 1 and less than or equal to N, fiNormalizing the recommended index for the ith second channel; when the random number(s) belongs to the interval [0, f1*M]Then, determining that the current metropolitan area Internet of things node selects to establish the 1 st second channel, f1And (4) normalizing the recommended index for the 1 st second channel.
2. The method for selecting a wireless channel of a metro internet of things node according to claim 1,
the base station broadcast information comprises any one or any combination of idle rate (r), communication quality (q) and second channel logarithm (n) for representing each transceiving module in the base station;
the attribute information of the metropolitan area Internet of things node comprises the following steps: and any one or any combination of the priority (p) and the data transmission amount (o) of the metro IOT node.
3. The method for wireless channel selection for a metro internet of things node according to claim 1, the method further comprising:
judging whether the current metropolitan area Internet of things node and the selected second channel are established successfully or not;
and if the establishment fails, regenerating the random number(s) of the current metropolitan area Internet of things node between the intervals [0, M ], and re-determining the selected second channel according to the regenerated random number.
4. A wireless channel selection device of a metropolitan area Internet of things node is characterized by comprising:
the base station broadcast information receiving module is used for receiving base station broadcast information through a first channel, and the base station broadcast information is used for representing the state of each transceiver module in the base station;
the attribute acquisition module is used for acquiring the attribute of the metropolitan area Internet of things node;
a module for calculating a recommendation index established by the current metropolitan area Internet of things node and each second channel according to the base station broadcast information and the attributes of the metropolitan area Internet of things node, wherein the recommendation index established by the current metropolitan area Internet of things node and each second channel is calculated according to the attributes of the current metropolitan area Internet of things node and the state of a base station transceiving module corresponding to the ith second channel, i is an integer, i is more than or equal to 1 and less than or equal to N, the number of each transceiving module is N, and N is an integer more than 1; the number of the metropolitan area Internet of things nodes is multiple, and N second channels can be established between each transceiver module and any one of the metropolitan area Internet of things nodes one by one;
for normalizing each recommendation index to obtain a normalized recommendation index (f)i) The module of (1);
a module for generating a random number(s) for said current metro internet of things node between intervals [0, M ], M being a number greater than 0;
means for determining the section to which the random number(s) belongs when the random number(s) belongs
Figure FDA0002772998040000021
Then, determining that the current metropolitan area Internet of things node selects to establish a kth second channel, wherein k is more than or equal to 1 and less than or equal to N, fiNormalizing the recommended index for the ith second channel; when the random number(s) belongs to the interval [0, f1*M]Then, the current metropolitan area Internet of things node is determined to be selected and builtSetting up the 1 st second channel, f1And (4) normalizing the recommended index for the 1 st second channel.
5. The wireless channel selection apparatus of a metro internet of things node according to claim 4,
the base station broadcast information comprises any one or any combination of idle rate (r), communication quality (q) and second channel logarithm (n) for representing each transceiving module in the base station;
the attributes of the metropolitan area internet of things node comprise: and any one or any combination of the priority (p) and the data transmission amount (o) of the metro IOT node.
6. A wireless channel selection system for a metropolitan area Internet of things node is characterized by comprising the following components:
a base station broadcast module acquires the state of each transceiver module in a base station;
the base station broadcasting module broadcasts broadcasting information to a metropolitan area Internet of things node, wherein the broadcasting information is used for representing the state of each transceiving module;
the metropolitan area Internet of things node receives base station broadcast information through a first channel, wherein the base station broadcast information is used for representing the state of each transceiver module in a base station;
the metropolitan area Internet of things node acquires the attribute of the metropolitan area Internet of things node;
the metropolitan area Internet of things node calculates a recommendation index established by the current metropolitan area Internet of things node and each second channel according to the base station broadcast information and the attributes of the metropolitan area Internet of things node, wherein the recommendation index established by the current metropolitan area Internet of things node and each second channel is calculated according to the attributes of the current metropolitan area Internet of things node and the state of a base station transceiving module corresponding to the ith second channel, i is an integer, i is more than or equal to 1 and less than or equal to N, the number of each transceiving module is N, and N is an integer more than 1; the number of the metropolitan area Internet of things nodes is multiple, and N second channels can be established between each transceiver module and any one of the metropolitan area Internet of things nodes one by one;
the metropolitan area Internet of things node normalizes each recommendation index to respectively obtain normalized recommendation indexes (f)i)；
The metropolitan area Internet of things node generates a random number(s) of the current metropolitan area Internet of things node between intervals [0, M ], wherein M is a number larger than 0;
the metropolitan area Internet of things node determines the section of the random number(s), and when the random number(s) belongs to the section
Figure FDA0002772998040000031
Then, determining that the current metropolitan area Internet of things node selects to establish a kth second channel, wherein k is more than or equal to 1 and less than or equal to N, fiNormalizing the recommended index for the ith second channel; when the random number(s) belongs to the interval [0, f1*M]Then, determining that the current metropolitan area Internet of things node selects to establish the 1 st second channel, f1And (4) normalizing the recommended index for the 1 st second channel.
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