CN106851757A - A kind of heterogeneous network switch method based on SDN and SDR - Google Patents
A kind of heterogeneous network switch method based on SDN and SDR Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0088—Scheduling hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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Abstract
The present invention proposes a kind of heterogeneous network switch method based on SDN and SDR, for solving poor reliability present in existing heterogeneous network switch method and the low technical problem of wireless resource utility efficiency, including sets dual switching threshold；Wireless terminal status information is collected in the soft base station of source radio network, and by information reporting SDN controllers under the conditions of pre-switch is met；The soft base station state of SDN controller monitoring wireless networks, associated wireless terminal's status information determines the soft base station of optimal objective wireless network and predistribution Radio Resource；The soft base station of source radio network updates wireless terminal status information, and sets switching time threshold value, in the threshold timeframe, judges whether wireless terminal meets switching condition, and result is reported into SDN controllers；SDN controllers decide whether to issue predistribution resource according to reported result；The soft base station of optimal objective wireless network adjusts network parameter on demand；SDN controllers issue flow table, realize that heterogeneous network switches.
Description
Technical field
The invention belongs to communication technical field, be related to a kind of heterogeneous network switch method, and in particular to one kind based on SDN and
The heterogeneous network switch method of SDR, can be used in heterogeneous network provide reliable network switching.
Background technology
In recent years, with the fast development of mobile communication technology, terminal device tends to variation, Yong Huxu with application species
Ask and naturally also show diversity and time variation, mobile data flow increases sharply, these demands have all promoted next generation communication system
System --- the development of 5G.It is various in order to ensure that large-scale wireless coverage, diversified terminal are accessed and high speed data transfers
The heterogeneous network of the network coexisted composition of different systems, the necessarily development trend of 5G communication systems.
But between traditional numerous heterogeneous networks, the network architecture closing of various standards can not enter row information friendship each other
Mutually, it is difficult to realize the scheduling of resource of the whole network, therefore existing in heterogeneous network cannot quickly determine target handover network, switch
The problems such as easily there is ping-pong in journey.Meanwhile, the new demand servicing type for continuing to bring out out, to the demand of Internet resources also it is each not
It is identical, under the current rigid network architecture, it is difficult to which the different demands for different user provide the service of customization.
For the problem that conventional heterogeneous network is present, the appearance of following two technologies just can be in different aspects to above-mentioned
Problem is improved.A kind of is in a kind of brand-new of proposition in 2008 by Clean Slate project team of Stanford Univ USA
The network architecture --- software defined network SDN, is separated, the network control of centralization, open by its chain of command and data surface
Programmable interface feature, can simplify existing rigid wireless network architecture, while the unified pipe to the whole network resource can be realized
Reason, reasonably distributes wireless network resource, realizes that the whole network performance optimizes.Another kind is the appearance of software-defined radio SDR, will
Network equipment software and hardware is mutually decoupled, and the function that could be realized based on conventional hardware is realized using the mode of software programming, its spirit
Programmability living provides possibility for diversified, the customization service of following 5G networks.Future network will gradually tend to software
Definitionization, it is widely accepted.
Switching between heterogeneous network is constantly among development as an important technology of influence heterogeneous network performance.
Heterogeneous network switch method based on SDN, although can utilize SDN controllers, realizes the unified management and the whole network resource of the whole network
Scheduling, but because target handover network structure ossifys, it is impossible to customization service is provided the user, user can be caused to trigger again
Switching, causes ping-pong, and switching reliability is low.The heterogeneous network switch method of SDN and SDR is currently based on, using the spirit of SDR
Configuration feature living, can provide the user the customization service for meeting demand, overcome and be based only on SDN and realize that heterogeneous network switches
Defect.Author Kun Wang, Yihui Wang, Deze Zeng and Song Guo are in IEEE Wireless within 2 months 2017
Paper " the An SDN-Based Architecture for Next-Generation delivered on Communications
A kind of heterogeneous network switch method is disclosed in Wireless Networks ".SDN controllers collect the current mobile message of user,
The mobile route of user is predicted, so that it is determined that objective network, and notification instruction is sent and is given the objective network；Meanwhile, SDN controllers
Optimal Radio Resource is searched for according to user's current state information in advance and objective network is issued to, the reply for triggering objective network rings
Should；Responded according to the reply, objective network initiates handover request to source network, source network receives the company of release and user after request
Connect, switch between completing heterogeneous network.The characteristics of although the method make use of SDN controllers overall situation visual angle, is uniformly controlled, Ke Yiti
It is preceding for user realizes optimal radio resource allocation, while provide the user service using the flexible configuration of SDR, but still suffer from
Lower deficiency：(1) SDN controllers are directly collected to user profile, calculate, and many users under general condition and do not need
Switch over judgement, therefore waste storage and the computing resource of SDN controllers, increase its burden；(2) SDN controllers exist
The optimal radio resource allocation that to search in advance is completed before switching to objective network, however user service have diversity and when
Denaturation, once user have changed business demand, then and the Radio Resource for issuing in advance necessarily causes the wasting of resources；(3) cutting
Handover request is initiated from objective network to source network when changing, once user's movement changes and causes the change of objective network, then
Correct switching cannot be realized, and now the method can only move back and perform heterogeneous network according to conventional handover method and switch, it is reliable
Property cannot be ensured.
The content of the invention
It is an object of the invention to the defect for overcoming above-mentioned prior art to exist, it is proposed that a kind of based on the different of SDN and SDR
Structure method for switching network is low for solving poor reliability present in existing heterogeneous network switch method and wireless resource utility efficiency
Technical problem.
To achieve the above object, the technical scheme that the present invention takes comprises the following steps：
(1) dual decision threshold, respectively the pre-switch signal strength threshold C of the soft base station of source radio network are set1With certainly
Determine switching signal intensity threshold C2, and C1>C2；
(2) the soft base station of source radio network carries out monitor in real time to wireless terminal status, obtains wireless terminal current state letter
Breath：Feedback signal strength R1, position, translational speed, direction, service request and user selection preference；
(3) the soft base station of source radio network judges the feedback signal strength R in wireless terminal current state information1Whether it is less than
Pre-switch signal strength threshold C1, if so, recording the moment for pre-switch moment T1, and by wireless terminal current state information
SDN controllers are reached, while position, translational speed and direction in wireless terminal current state information, during setting switching
Between threshold value T；Otherwise, step (2) is performed；
(4) SDN controllers carry out monitor in real time to the soft base station state of wireless network, obtain the current shape in the soft base station of wireless network
State information：Coverage, type and hold Radio Resource；
(5) SDN controllers are uploaded using the soft base station of source radio network wireless terminal status information and the soft base of wireless network
Stand status information, the soft base station of multiple target radio networks is predicted, obtain the soft base station of optimal objective wireless network, and according to
Service request in wireless terminal status information, is scheduled to heterogeneous network Radio Resource, obtains optimal objective wireless network
The predistribution Radio Resource and predistribution radio resource parameter of soft base station, then will predistribution radio resource parameter and wireless terminal shape
State information is together issued to the soft base station of optimal objective wireless network；
(6) the soft base station of source radio network is updated to wireless terminal status, obtains wireless terminal more new state information, bag
Include current time T2, feedback signal strength R2, position, translational speed, direction, service request and user selection preference, and judge work as
Preceding time interval T2-T1Whether switching time threshold value T is more than, if so, wireless terminal more new state information is uploaded into SDN controls
Device simultaneously updates switching time threshold value T and pre-switch moment T1, perform step (7)；Otherwise, step (8) is performed；
(7) SDN controllers are updated to the soft base station state information of wireless network, obtain the soft base station of wireless network and update shape
State information, and perform step (5)；
(8) the soft base station of source radio network judges the feedback signal strength R in the wireless terminal more new state information for obtaining2It is
It is no less than determining switching signal intensity threshold C2, if so, performing step (9)；Otherwise, step (6) is performed；
(9) the soft base station of source radio network judges that the service request in the wireless terminal more new state information for obtaining is relatively wireless whole
Whether the service request in the current state information of end changes, if so, generating hand off signaling 1 and being uploaded to SDN controllers, holds
Row step (10)；Otherwise, generate hand off signaling 2 and be uploaded to SDN controllers, perform step (11)；
(10) SDN controllers reclaim predistribution Radio Resource, generate self adaptation hand off signaling, and be issued to optimal objective without
The soft base station of gauze network；The soft base station of optimal objective wireless network according to the self adaptation hand off signaling for receiving, using holding Radio Resource,
Self-adaptative adjustment is carried out to network parameter, to realize at utmost meeting wireless terminal service request；
(11) SDN controllers will pre-allocate Radio Resource and be issued to the soft base station of optimal objective wireless network, optimal objective without
The predistribution radio resource parameter that the soft base station of gauze network obtains according to step (5), is adjusted to current network parameter, to realize
Immediately wireless terminal service request is adapted to；
(12) SDN controllers issue flow table, are that wireless terminal is opened and the link of the soft base station of optimal objective wireless network connects
Connect, simultaneously switch off the link connection with the soft base station of source radio network, realize the switching of heterogeneous network.
The present invention compared with prior art, with advantages below：
1st, it is of the invention due to during realizing that heterogeneous network switches, using dual judgement, the soft base station of source radio network
SDN controllers are uploaded to by the wireless terminal status information that switching condition is only will be provided with after pre- judgement, SDN controllers are reduced
Amount of calculation and save its storage resource；Meanwhile, again to the business of wireless terminal when carrying out second judgement after pre- judgement
Request is judged that, in the case where service request changes temporarily, the recyclable predistribution Radio Resource of SDN controllers is kept away
Exempt from waste of radio resources, improve heterogeneous network wireless resource utility efficiency.
When the 2nd, in the present invention due to realizing second judgement after pre- judgement, switching time threshold value T, source radio network are set
Soft base station can in time find the state change of wireless terminal, so as to redefine optimal objective wireless network soft for wireless terminal
Base station, and using the flexible configuration characteristic of SDR, the soft base station of optimal objective wireless network can fast and accurately change Radio Resource
Parameter, meets wireless terminal demand to a greater extent, so as to reduce switching times, it is to avoid the generation of ping-pong, carries
The reliability of heterogeneous network switching high.
Brief description of the drawings
Fig. 1 is the heterogeneous network architectural configurations schematic diagram of the embodiment of the present invention；
Fig. 2 is that FB(flow block) is realized in heterogeneous network of the present invention switching.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Reference picture 1, the heterogeneous network framework based on SDN and SDR, including the soft base station of SDN controllers, wireless network and wireless
Terminal, wherein：
SDN controllers, for being connected with the soft base station chain of command of each wireless network, determine optimal objective wireless network, the palm
Control the whole network scheduling of resource.
The soft base station of wireless network, is the various wireless networks of the obedience communication standard based on software defined radio exploitation
Network base station, for carrying out information exchange, including baseband processing unit, Software Radio platform with SDN controllers and wireless terminal
With virtual switch OVS, wherein baseband processing unit is various Base-Band Processings that the utilization software being deployed on computer is realized
Functional module, the process such as encoding and decoding and modulation /demodulation for completing signal；Software Radio platform is used to complete the number of signal
The processes such as word Up/Down Conversion, sampling and interpolation, and treated signal is sent in wireless network by radio-frequency antenna；Virtually
Interchanger OVS meets OpenFlow agreements and is communicated for the soft base station of wireless network with SDN controllers.
Wireless terminal, for receiving the data issued by the soft base station of wireless network, and by its status information feedback to wireless
The soft base station of network.
It is connected by internet between SDN controllers and the soft base station of wireless network, row information is entered using virtual switch OVS
Interaction；Communicated by Radio Link between the soft base station of wireless network and wireless terminal.
Heterogeneous network framework based on SDN and SDR, including the soft base station of at least one source radio network and at least one target
The soft base station of wireless network, wherein, the soft base station of source radio network and the soft base station of target radio network can correspond to various wireless standards
Network base station, this example with presently the most conventional WiFi and LTE network, respectively as the soft base station of source radio network and target without
The soft base station of gauze network, the referred to as soft AP of WiFi network and the soft base station of LTE network, for illustrating wireless terminal by WiFi network extremely
The handoff procedure of LTE network.
A kind of reference picture 2, heterogeneous network switch method based on SDN and SDR, comprises the following steps：
Step 1：Set dual decision threshold, respectively the pre-switch signal strength threshold C of the soft AP of WiFi network1And decision
Switching signal intensity threshold C2, and C1>C2；Different signal strength thresholds can determine that the soft AP of WiFi network is different size of and cover
Lid scope；
Step 2：The soft AP of WiFi network carries out monitor in real time to wireless terminal status, obtains wireless terminal current state letter
Breath：Feedback signal strength R1, position, translational speed, direction, service request and user selection preference；
Step 3：The soft AP of WiFi network judges the feedback signal strength R in wireless terminal current state information1Whether it is less than
Pre-switch signal strength threshold C1, if so, recording the moment for pre-switch moment T1, and by wireless terminal current state information
SDN controllers are reached, while position, translational speed and direction in wireless terminal current state information, predict wireless
Terminal reaches the soft AP of WiFi network to determine switching signal intensity threshold C2The maximum time on the coverage border of determination, by this
Maximum time is set to switching time threshold value T；Otherwise, step 2 is performed；
Wherein, the feedback signal strength size in wireless terminal current state information, carries out pre- judgement, can screen
The wireless terminal of standby switching condition is provided, i.e. SDN controllers only need to enter the wireless terminal status information for possessing switching condition
Row treatment, reduces the amount of calculation of SDN controllers and saves its storage resource；
Step 4：SDN controllers carry out monitor in real time to the soft base station state of all wireless networks in heterogeneous network, obtain nothing
The soft base station current state information of gauze network：Coverage, type and hold Radio Resource；
Step 5：Position, shifting of the SDN controllers in the wireless terminal current state information of the soft AP uploads of WiFi network
Dynamic speed and direction, the soft base station location of target radio network that will enter to wireless terminal is predicted, while according to wireless
Service request and user preference in terminal current state information, are predicted to the soft base station type of target radio network, joint
The soft base station of optimal objective wireless network is obtained, the soft base station of optimal objective wireless network is the soft base station of LTE network in this example；And root
According to the service request in wireless terminal status information, heterogeneous network Radio Resource is scheduled, obtains the soft base station of LTE network
Predistribution Radio Resource and predistribution radio resource parameter, then will predistribution radio resource parameter and wireless terminal status information one
It is same to be issued to the soft base station of LTE network；
Because the status information of wireless terminal and the soft base station of wireless network is being entered in real-time update, therefore SDN controllers
The soft base station of row optimal objective wireless network really timing, all the time with SDN controllers it is newest upload or update wireless terminal with
The status information of the soft base station of wireless network is defined, i.e., in this example, after pre- judgement SDN controllers using wireless terminal with
The current state information of the soft AP of WiFi network, is determined to the soft base station of optimal objective wireless network, and is entering second judgement
If preceding time interval T2-T1More than switching time threshold value T, then using wireless terminal and the more new state information of the soft AP of WiFi network,
The soft base station of optimal objective wireless network is redefined；
Wherein, determination of the SDN controllers to the soft base station of optimal objective wireless network, can use different letters according to different demands
Breath is predicted that the mobility information and service request that this example is employed in wireless terminal status information carry out associated prediction,
Seek to fill that service request of the wireless terminal under target radio network coverage；
Step 6：The soft AP of WiFi network carries out continuous updating to wireless terminal status, obtains wireless terminal more new state letter
Breath, including current time T2, feedback signal strength R2, position, translational speed, direction, service request and user selection preference, and
Judge current time interval T2-T1Whether switching time threshold value T is more than, if so, wireless terminal more new state information is uploaded to
SDN controllers simultaneously update switching time threshold value T and pre-switch moment T1, perform step 7；Otherwise, step 8 is performed；
Wherein, positions of the soft AP of WiFi network in wireless terminal more new state information, translational speed and direction, prediction
Wireless terminal reaches the soft AP of WiFi network to determine switching signal intensity threshold C2The maximum time on the coverage border of determination,
The maximum time is updated to T；The soft AP of WiFi network is by current time T2Assign pre-switch moment T1, it is updated to the pre-switch moment
T1；
By by current time interval T2-T1It is compared with switching time threshold value T, is realized to whether wireless terminal enters
Enter prejudging for second judgement, it is ensured that the timely perception changed to wireless terminal movement target, such that it is able to again
For wireless terminal determines the soft base station of optimal objective wireless network, and then ensure that the reliability of heterogeneous network switching；
Step 7：SDN controllers are updated to the soft base station state information of all wireless networks in heterogeneous network, obtain nothing
The soft base station of gauze network more new state information, and perform step 5；
Step 8：The soft AP of WiFi network carries out the second judgement after pre- judgement, the wireless terminal more new state letter that judgement is obtained
Feedback signal strength R in breath2Whether less than decision switching signal intensity threshold C2, if so, performing step 9；Otherwise, step is performed
Rapid 6；
Step 9：The soft AP of WiFi network judges that the service request in the wireless terminal more new state information for obtaining is relatively wireless whole
Whether the service request in the current state information of end changes, if so, generating hand off signaling 1 and being uploaded to SDN controllers, holds
Row step 10；Otherwise, generate hand off signaling 2 and be uploaded to SDN controllers, perform step 11；
Step 10：SDN controllers reclaim predistribution Radio Resource, generate self adaptation hand off signaling, and be issued to LTE network
Soft base station；The soft base station of LTE network, using Radio Resource is held, is carried out according to the self adaptation hand off signaling for receiving to network parameter
Self-adaptative adjustment, to realize at utmost meeting wireless terminal service request；
Step 11：SDN controllers will pre-allocate Radio Resource and be issued to the soft base station of LTE network, the soft base station of LTE network according to
The predistribution radio resource parameter that step 5 is obtained, is adjusted to current radio resource parameter, to realize adapting to wireless whole immediately
End service request；
Due to having carried out second judgement after pre-switch, and again to the service request of wireless terminal in second judgement
Judged, according to the different situations whether service request changes temporarily under, SDN controllers may be selected to reclaim or issue pre-
Distributing radio resource, it is to avoid waste of radio resources, improves heterogeneous network wireless resource utility efficiency；
Step 12：SDN controllers issue flow table, are the link connection of wireless terminal unlatching and the soft base station of LTE network, while
The link connection with the soft AP of WiFi network is disconnected, the switching of heterogeneous network is realized.
Claims (4)
1. a kind of heterogeneous network switch method based on SDN and SDR, it is characterised in that comprise the following steps：
(1) dual decision threshold, respectively the pre-switch signal strength threshold C of the soft base station of source radio network are set1Switch with decision
Signal strength threshold C2, and C1>C2；
(2) the soft base station of source radio network carries out monitor in real time to wireless terminal status, obtains wireless terminal current state information：Instead
Feedback signal intensity R1, position, translational speed, direction, service request and user selection preference；
(3) the soft base station of source radio network judges the feedback signal strength R in wireless terminal current state information1Whether pre-cut is less than
Change signal strength threshold C1, if so, recording the moment for pre-switch moment T1, and wireless terminal current state information is uploaded to
SDN controllers, while position, translational speed and direction in wireless terminal current state information, set switching time threshold
Value T；Otherwise, step (2) is performed；
(4) SDN controllers carry out monitor in real time to the soft base station state of wireless network, obtain the soft base station current state letter of wireless network
Breath：Coverage, type and hold Radio Resource；
(5) SDN controllers are uploaded using the soft base station of source radio network wireless terminal status information and the soft base station shape of wireless network
State information, is predicted to the soft base station of multiple target radio networks, obtains the soft base station of optimal objective wireless network, and according to wireless
Service request in terminal's status information, is scheduled to heterogeneous network Radio Resource, obtains the soft base of optimal objective wireless network
The predistribution Radio Resource and predistribution radio resource parameter stood, then predistribution radio resource parameter is believed with wireless terminal status
Breath is together issued to the soft base station of optimal objective wireless network；
(6) the soft base station of source radio network is updated to wireless terminal status, obtains wireless terminal more new state information, including work as
Preceding moment T2, feedback signal strength R2, position, translational speed, direction, service request and user's selection preference, and when judging current
Between be spaced T2-T1Whether switching time threshold value T is more than, if so, wireless terminal more new state information is uploaded into SDN controllers simultaneously
Update switching time threshold value T and pre-switch moment T1, perform step (7)；Otherwise, step (8) is performed；
(7) SDN controllers are updated to the soft base station state information of wireless network, obtain the soft base station of wireless network more new state letter
Breath, and perform step (5)；
(8) the soft base station of source radio network judges the feedback signal strength R in the wireless terminal more new state information for obtaining2It is whether small
In decision switching signal intensity threshold C2, if so, performing step (9)；Otherwise, step (6) is performed；
(9) the soft base station of source radio network judges that the service request in the wireless terminal more new state information for obtaining is worked as compared with wireless terminal
Whether the service request in preceding status information changes, if so, generating hand off signaling 1 and being uploaded to SDN controllers, performs step
Suddenly (10)；Otherwise, generate hand off signaling 2 and be uploaded to SDN controllers, perform step (11)；
(10) SDN controllers reclaim predistribution Radio Resource, generate self adaptation hand off signaling, and be issued to optimal objective wireless network
The soft base station of network；The soft base station of optimal objective wireless network according to the self adaptation hand off signaling for receiving, using Radio Resource is held, to net
Network parameter carries out self-adaptative adjustment, to realize at utmost meeting wireless terminal service request；
(11) SDN controllers are issued to the soft base station of optimal objective wireless network, optimal objective wireless network by Radio Resource is pre-allocated
The predistribution radio resource parameter that the soft base station of network obtains according to step (5), is adjusted to current network parameter, to realize immediately
Adapt to wireless terminal service request；
(12) SDN controllers issue flow table, are the link connection of wireless terminal unlatching and the soft base station of optimal objective wireless network, together
When disconnect with the link connection of the soft base station of source radio network, realize the switching of heterogeneous network.
2. a kind of heterogeneous network switch method based on SDN and SDR according to claim 1, it is characterised in that step
(3) the switching time threshold value T described in, refers to position of the soft base station of source radio network in wireless terminal current state information
Put, translational speed and direction, predict wireless terminal and reach the soft base station of source radio network to determine switching signal intensity threshold C2
The maximum time on the coverage border of determination.
3. a kind of heterogeneous network switch method based on SDN and SDR according to claim 1, it is characterised in that step
(5) the soft base station of determination optimal objective wireless network described in, implementation method is：SDN controllers, according to the current shape of wireless terminal
Position, translational speed and direction in state information, the soft base station location of target radio network that will enter to wireless terminal are carried out
Prediction, while service request and user preference in wireless terminal current state information, to the soft base station of target radio network
Type is predicted.
4. a kind of heterogeneous network switch method based on SDN and SDR according to claim 1, it is characterised in that step
(6) renewal switching time threshold value T and pre-switch moment T described in1, specially：The soft base station of source radio network is according to wireless whole
Position, translational speed and direction in the more new state information of end, prediction wireless terminal reach the soft base station of source radio network to determine
Switching signal intensity threshold C2The maximum time on the coverage border of determination, the maximum time is updated to T；Source radio network
Soft base station is by current time T2Assign pre-switch moment T1, it is updated to pre-switch moment T1。
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| CN112732356A (en) * | 2021-01-11 | 2021-04-30 | 江西中瑞防雷技术有限公司 | Data monitoring management system of intelligent platform system |
| CN114339924A (en) * | 2021-12-15 | 2022-04-12 | 中国船舶重工集团公司第七0九研究所 | DQN-based network switching method for high-low frequency hybrid networking |
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