CN106851559A - A kind of wireless cognition channel power suitable for vehicle-mounted short distance communication network distributes optimization method - Google Patents
A kind of wireless cognition channel power suitable for vehicle-mounted short distance communication network distributes optimization method Download PDFInfo
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- CN106851559A CN106851559A CN201611203797.0A CN201611203797A CN106851559A CN 106851559 A CN106851559 A CN 106851559A CN 201611203797 A CN201611203797 A CN 201611203797A CN 106851559 A CN106851559 A CN 106851559A
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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
- H04W4/02—Services making use of location information
- H04W4/025—Services making use of location information using location based information parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
- H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay
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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
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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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
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/32—TPC of broadcast or control channels
- H04W52/322—Power control of broadcast channels
Abstract
Optimization method, including region Interference Detection model foundation, parameter acquiring and power distribution optimized algorithm, cognitive working node power optimization are distributed the invention provides a kind of wireless cognition channel power suitable for vehicle-mounted short distance communication network.The present invention obtains interference temperature using the power distribution optimized algorithm of design by detection node, is then authorizing multi-band broadcast to cognitive working node, cognitive working node is using the algorithm for setting, power to this node is adjusted, and repeats said process, obtains the optimization of one's respective area internal power distribution.
Description
Technical field
Optimization method is distributed the present invention relates to a kind of wireless cognition channel power suitable for vehicle-mounted short distance communication network,
Belong to vehicle-mounted network technology field.
Background technology
By perceiving external environment condition, dynamic access leaves unused frequency spectrum cognitive radio (cognitive radio, CR), passes through
Dynamic Spectrum Management mechanism, using spectrum interposition, realizes primary and secondary users to share frequency spectrum.
Vehicle-mounted short haul connection (Vehicle to X：V2X) network is by short distances such as radio communication, GPS/GIS, sensings
From in-car (CAN-Controller Area Network), bus or train route (Vehicle-2-RSU), workshop that the communication technology is realized
(Vehicle-2-Vehicle), car is outer between (vehicle-2-Infrastructure), people's car (Vehicle-2-Person)
Communication.
V2X is with the fixed frequency range for authorizing, but narrower bandwidth.Bulk information service class extension class business in V2X, by
In the limitation of authorized bandwidth, the expansion of its class of business and the diversity of business tine are influenceed.
Cognitive radio technology can effectively expand the working frequency range of V2X, and the channel of high bandwidth is provided for extension class business,
Because extension classes of the V2X based on information service be not strict to delay requirement, it is highly suitable for being transmitted in cognitive channel.
Cognitive system in V2X is that a kind of dynamic utilizes spectrum system, from from the perspective of single user, its dynamic
The frequency spectrum usage behavior being embodied between cognitive user influences each other.Power Control is an important topic in communication network,
The purpose is to suppressing network interferences, saving the energy of terminal device and ensureing the service quality of communication link.For cognitive net
Network, Power Control can also control the interference to authorized user, therefore the optimization of Power Control plays important to cognitive system
Effect.
Existing power control algorithm, major part is directed to the communication network of communication node fixation.Vehicle-mounted section in due to V2X
Point is in quickly movement, and the change of the distance between node and node of surrounding is frequent, it is impossible to which the directly existing cognition of application is saved
Point Power Control optimized algorithm.In addition, in the cognitive Power Control optimized algorithm in part, many detection nodes that set think cognitive nodes
The work of feedback cognitive nodes in V2X quickly mobile vehicle, sets up this kind of special detection node to the interference temperature of primary user
Also it is relatively difficult.
The content of the invention
Calculated the invention provides a kind of wireless cognition channel power distribution optimization suitable for vehicle-mounted short distance communication network
Method, including three parts.Part I is that Interference Detection model in region is set up, by authorization channel periodic broadcasting comprising vehicle-mounted
The unique mark of node and the heartbeat message in geographical position, obtain the information of the vehicle-mounted node of surrounding, are then worked by cognition
Node state is broadcasted, and obtains the Node distribution and working channel of one's respective area cognition working node.Other do not operate at cognitive letter
The node in road is arranged to cognition detection node, by receiving the signal that cognitive working node sends, calculates cognitive interference temperature；The
Two parts are parameter acquiring and power distribution optimized algorithm, and vehicle-mounted node obtains cognitive channel and correspondence by trackside node broadcasts
Jamming power thresholding, then determine Optimized model using lagrangian optimization algorithm and game theory；Part III is cognitive
Working node power optimization, using the power distribution optimized algorithm of design, interference temperature is obtained by detection node, is then being authorized
Multi-band broadcast is adjusted to cognitive working node, cognitive working node using the algorithm for setting, the power to this node, repeats
Said process, obtains the optimization of one's respective area internal power distribution.
Optimization side is distributed the invention provides a kind of wireless cognition channel power suitable for vehicle-mounted short distance communication network
Method, it is characterised in that vehicle-mounted node obtains cognitive channel and corresponding jamming power thresholding by trackside node broadcasts, by fixed
The message comprising node unique mark and geographical position of phase broadcast, obtains the information of the vehicle-mounted node of surrounding.Cognition work section
Point broadcasts its state, and other nodes are arranged to cognition detection node, cognitive interference are calculated, then using lagrangian optimization algorithm
With game theory algorithm, interference temperature is obtained by detection node, then authorizing multi-band broadcast to cognitive working node, cognition work
Node is adjusted to the power of this node, repeats said process, obtains the optimization of one's respective area internal power distribution.
Preferably, following steps S1, S2, S3 are specifically included：
S1, region Interference Detection model are set up, and it includes
S11, cognitive working node state broadcast；
The vehicle-mounted node mode setting of S12, cognitive interference detection state；
The power distribution Optimized model of S13, vehicle-mounted node；
S2, parameter acquiring and power distribution optimized algorithm, it includes
S21, detection node jamming power threshold sets；
S22, Lagrange operator and lax；
S23, vector λ are solved；
S24, Best response function are solved；
S3, cognitive working node power optimization, it includes
S31, detection node broadcast interference temperature；
S32, cognitive nodes adjustment power；
S33, variable update；
S34, circulation.
Preferably, in the step S11, the vehicle-mounted node using cognitive multi-channel operation is cognitive in authorization channel periodic broadcasting
The channel use state of channel so that cognition detection node can know that the cognitive channel for needing detection；
Preferably, in the step S12, the vehicle-mounted node of cognitive channel is not operated at as cognition detection node, carry
Interference Detection is known in confession；
Preferably, in the step S13, it is limited to build power distribution optimization by utility of power function and interference temperature
Model；
Preferably, in the step S21, trackside node provides cognitive channel and corresponding jamming power thresholding, by authorizing
Channels broadcast is saved in vehicle-mounted node, vehicle-mounted node after receiving local, and is received in next trackside node new similar
Local information is updated after type broadcast；
Preferably, in the step S31, after cognition detection node calculates interference temperature, cognitive working node is broadcast to, is recognized
Know the interference temperature that working node feeds back according to each detection node for receiving, signal transmitting power is adjusted, to optimize local area
The power distribution of the cognitive working node in domain.
In present invention utilization V2X networks in regional area, the vehicle-mounted node of cognitive channel is not used to undertake detection interference
The work of temperature, then feeds back to cognitive working node in authorization channel, so as to the power distribution for realizing whole region optimizes.
Brief description of the drawings
Fig. 1 is the workflow diagram according to the inventive method；
Fig. 2 is the notification broadcast bag form schematic diagram that cognitive channel is taken according to the vehicle-mounted node of the inventive method；
Fig. 3 is the vehicle-mounted node interference temperature measurement model schematic diagram according to the inventive method.
Specific embodiment
Optimization side is distributed the invention provides a kind of wireless cognition channel power suitable for vehicle-mounted short distance communication network
Method, the method includes three parts in step, is respectively that region Interference Detection model is set up, parameter acquiring and power distribution optimize
Algorithm, cognitive working node power optimization, the present invention is described in further detail below.
Part I, region Interference Detection model are set up
In regional area, vehicle-mounted node is authorizing frequency range periodically broadcast packet unique mark containing vehicle (VIN) and geography
The security classes applications such as message (abbreviation heartbeat message) user's anticollision of position.Vehicle-mounted node is wide by receiving the vehicle-mounted node of surrounding
The heartbeat message broadcast, can obtain the quantity of the vehicle-mounted node of coverage inner periphery and respective position.If in certain region in Q,
Having T vehicle-mounted node can mutually receive respective heartbeat message.
1.1st, cognitive working node state broadcast
It is located in Q regions, has N number of vehicle-mounted node to be operated in cognitive channel, default these nodes is in authorization channel
Periodicity broadcasts the working condition of the cognitive channel of its occupancy, and form is as shown in Fig. 2 wherein：
Type：Packet type, mark is the notification broadcast that vehicle-mounted node takes cognitive channel；
VIN：The unique mark of vehicle-mounted node, distinguishes different vehicle-mounted nodes；
GP：The geographical position of vehicle-mounted node, takes from the GPS or Big Dipper equipment of vehicle-mounted node；
Ch-XML：The service condition of the vehicle-mounted node cognition channel of sheet described using XML, notifies in coverage (general
150 meters of radius) the cognitive channel description that is currently in use of other vehicle-mounted this nodes of node, including channel frequency, bandwidth and work
Make mode.
1.2nd, the vehicle-mounted node mode setting of cognitive interference detection state
It is located in the Q of region, has M=T-N vehicle-mounted node not operate at cognitive frequency range, default these nodes work
In interferometry mode of operation, interferometry is carried out using its idle cognition module.By authorizing what UHF band reception was broadcasted
Cognitive channel channels broadcast bag, acquisition is operated in the quantity of the vehicle-mounted node of cognitive channel and the occupancy situation of cognitive channel.
1.3rd, the power distribution Optimized model of vehicle-mounted node
In the Q of region, vehicle-mounted node interference temperature measurement model is set up, as shown in figure 3, comprising N to receiving and dispatching vehicle-mounted node,
Interference level of the M vehicle-mounted node monitors cognitive nodes of interferometry to authorized user.
To any one node i in N number of cognitive working node, its letter drying is more as shown in Equation 1 than SINR：
Wherein, i={ 1,2 ..., N }, PiIt is its transmit power, GiIt is its channel gain, σ2It is noise.
To the arbitrary node k in M detection node, to ensure not disturb primary user, its total jamming power for receiving should expire
Sufficient formula 2：
Wherein, k={ 1,2 ..., M }, gikThe channel gain of cognitive working node i to detection node k, B be Bohr hereby
Graceful constant, TkIt is interference temperature thresholding, is that the maximum interference allowed by authorized user's receiving terminal is determined by default.
The utility function of cognitive working node i is u in definition region Qi(pi)=log (SINRi), it is its cognitive channel work(
The function of rate, the optimum allocation of each cognitive nodes power can be described with formula 3：
Subject to are " being limited to ", and the optimal power allocation for illustrating (formula 3) is limited to each test point of (formula 4)
Power can not disturb the limitation that primary user works.
Part II, parameter acquiring and power distribution optimized algorithm
Because vehicle is in motion, obtain the characteristic of available cognitive channel and its channel, it is necessary to a region compared with
Prolonged to perceive, vehicle realizes that this function is relatively difficult, and the present embodiment can use cognitive channel by trackside node by scanning
And the characteristic of learning cognition channel, including channel frequency, bandwidth, jamming power thresholding form broadcast packet, and broadcast distribution gives
The vehicle-mounted node for passing through, vehicle-mounted node is confessed after preserving and knows that channel is used and detection is used, until the issue of next trackside node
New data.
2.1st, detection node jamming power threshold sets
Cognition detection node is according to the working frequency of all cognitive working nodes in region in the Q of region, from local cache
Obtain corresponding jamming power thresholding Zk=BTk, illustrate the maximum interference power of detection node k permissions.
2.2nd, Lagrange operator and lax
The condition for releasing (formula 4) using Lagrange multiplier method is limited, and obtains Lagrangian such as (formula 5) shown：
Optimized power distribution is equivalent to solution (formula 6)：
2.3rd, vector λ is solved
Vectorial λ={ λ1,λ2,...,λmTried to achieve by (formula 7)：
λ (t+1)=max { 0, λk(t)+lk(t)(Nk(t)-Zk) (formula 7)
T represents the computing moment, and (t+1) represents next computing moment, NkT () represents the general power that node k is detected, be equal to
lkRepresent and update step-length, tried to achieve by (formula 9)：
Wherein, α is a normal number of default.
2.4th, Best response function is solved
Use piRepresent the transmission power of cognitive working node i, p-iOther nodes of the expression in addition to cognitive working node i
Transmission power, then on the premise of other node powers are constant, the optimal power contribution of node i can be expressed as optimum response letter
Several solutions, according to game theory algorithm, is tried to achieve by (formula 10)：
Wherein, symbolRepresent max { a, min (b, X) }, πjIt is the testing result of detection node j feedbacks.
Part III, cognitive working node power optimization
3.1st, detection node broadcast interference temperature
Detection node k calculates the interference temperature for detecting, such as shown in (formula 11)：
And by interference temperature πkAuthorized channels according to default time interval, periodic broadcast to region Q.
3.2nd, cognitive nodes adjustment power
Cognitive nodes update real-time work(after the interference temperature that authorization channel receives detection node broadcast with (formula 12)
Rate：
3.3rd, variable update
Variable λ is updated using (formula 12) according to subgradient algorithmk, step-length is lk
λk(t+1)=max { 0, λk(t)+lk(t)(Nk(t)-Zk) (formula 12)
Step-length is lkTried to achieve by (formula 9).
3.4th, circulate
T=t+1, goes to 3.1, and the power for performing next cycle updates, and each cognitive nodes of region Q obtain power point
The optimization matched somebody with somebody.
The above is presently preferred embodiments of the present invention and its know-why used, for those skilled in the art
For, without departing from the spirit and scope of the present invention, it is any based on technical solution of the present invention on the basis of equivalent change
Change, simply replacement etc. obviously changes, belong within the scope of the present invention.
Claims (7)
1. a kind of wireless cognition channel power suitable for vehicle-mounted short distance communication network distributes optimization method, it is characterised in that
Vehicle-mounted node obtains cognitive channel and corresponding jamming power thresholding by trackside node broadcasts, and section is included by periodic broadcasting
Point unique mark and the message in geographical position, obtain the information of the vehicle-mounted node of surrounding.Cognitive working node broadcasts its state, its
His node is arranged to cognition detection node, calculates cognitive interference, then using lagrangian optimization algorithm and game theory algorithm, by
Detection node obtains interference temperature, is then authorizing multi-band broadcast to cognitive working node, and cognitive working node is to this node
Power is adjusted, and repeats said process, obtains the optimization of one's respective area internal power distribution.
2. a kind of wireless cognition channel power distribution suitable for vehicle-mounted short distance communication network according to claim 1 is excellent
Change method, it is characterised in that specifically include following steps S1, S2, S3：
S1, region Interference Detection model are set up, and it includes
S11, cognitive working node state broadcast；
The vehicle-mounted node mode setting of S12, cognitive interference detection state；
The power distribution Optimized model of S13, vehicle-mounted node；
S2, parameter acquiring and power distribution optimized algorithm, it includes
S21, detection node jamming power threshold sets；
S22, Lagrange operator and lax；
S23, vector λ are solved；
S24, Best response function are solved；
S3, cognitive working node power optimization, it includes
S31, detection node broadcast interference temperature；
S32, cognitive nodes adjustment power；
S33, variable update；
S34, circulation.
3. a kind of wireless cognition channel power distribution suitable for vehicle-mounted short distance communication network according to claim 2 is excellent
Change method, it is characterised in that in the step S11, using the vehicle-mounted node of cognitive multi-channel operation in authorization channel periodic broadcasting
The channel use state of cognitive channel so that cognition detection node can know that the cognitive channel for needing detection.
4. a kind of wireless cognition channel power distribution suitable for vehicle-mounted short distance communication network according to claim 2 is excellent
Change method, it is characterised in that in the step S12, does not operate at the vehicle-mounted node of cognitive channel as cognition detection node,
Cognitive interference detection is provided.
5. a kind of wireless cognition channel power distribution suitable for vehicle-mounted short distance communication network according to claim 2 is excellent
Change method, it is characterised in that in the step S13, be limited to build power distribution by utility of power function and interference temperature
Optimized model.
6. a kind of wireless cognition channel power distribution suitable for vehicle-mounted short distance communication network according to claim 2 is excellent
Change method, it is characterised in that in the step S21, trackside node provides cognitive channel and corresponding jamming power thresholding, by awarding
Power channels broadcast is saved in vehicle-mounted node, vehicle-mounted node after receiving local, and is received in next trackside node new same
Local information is updated after type broadcast.
7. a kind of wireless cognition channel power distribution suitable for vehicle-mounted short distance communication network according to claim 2 is excellent
Change method, it is characterised in that in the step S31, after cognition detection node calculates interference temperature, is broadcast to cognitive work section
Point, the interference temperature that cognitive working node feeds back according to each detection node for receiving adjusts signal transmitting power, to optimize
The power distribution of the cognitive working node in one's respective area.
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| CN114126025A (en) * | 2021-11-02 | 2022-03-01 | 中国联合网络通信集团有限公司 | Power adjustment method for vehicle-mounted terminal, vehicle-mounted terminal and server |
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