CN107071713A - The cellular network flow conveyer method communicated based on multi-hop D2D - Google Patents
The cellular network flow conveyer method communicated based on multi-hop D2D Download PDFInfo
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- CN107071713A CN107071713A CN201710406038.2A CN201710406038A CN107071713A CN 107071713 A CN107071713 A CN 107071713A CN 201710406038 A CN201710406038 A CN 201710406038A CN 107071713 A CN107071713 A CN 107071713A
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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
- H04W28/08—Load balancing or load distribution
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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
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
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Abstract
The present invention discloses a kind of cellular network flow conveyer method communicated based on multi-hop D2D, comprises the following steps：(10) surplus resources list is set up：Cellular network base station asks all microcellulor networks to upload surplus resources situation, and sets up surplus resources list；(20) the most NetFinds of surplus resources：Cellular network base station finds the most microcellulor network of surplus resources according to surplus resources list；(30) relaying access：According to the repeated link quality of free node in connection request node and the most microcellulor network of surplus resources, the best repeated link of selection link-quality carries out relaying access.The cellular network flow conveyer method communicated based on multi-hop D2D of the present invention, makes the honeycomb heterogeneous network that there is user's integrated distribution keep load balancing.
Description
Technical field
It is particularly a kind of to make the presence of user's integrated distribution the invention belongs to honeycomb heterogeneous network technical field of data transmission
The cellular network flow conveyer method communicated based on multi-hop D2D of honeycomb heterogeneous network load balancing.
Background technology
Mobile flow transhipment refers to transmit the stream that ought to be transmitted by cellular network using various wireless communication technology
Data are measured, load, the lifting network key performance of cellular network are reduced with this.In honeycomb self-organizing heterogeneous network, operation
Business usually by the less microcellulor network of multiple network coverage (such as：Pico cell and Femo cell etc.) it is deployed in
The spectrum utilization efficiency in region is improved in traditional cellular network (Macro cell), alleviates the flow pressure of hot spot region
And lift end-user experience.But it is due to user time and the random distribution in space, the unbalanced feelings of network load can be caused
Condition occurs, and the mobile flow transhipment technology communicated based on D2D can be utilized to realize Network Load Balance in this case.
If user only needs to the flows such as the shared, multiplayer of content without needing the application by base station or core network
Service, then it is contemplated that directly carrying out flow transhipment by the D2D communication technologys between user, lift service experience.But this stream
The defect of amount transhipment strategy is that it can only realize the flow transhipment between user, it is impossible to realize that the internetwork flow of microcellulor turns
Fortune.When user has the demand of access network, this strategy can not meet the demand of terminal user.Now it is contemplated that utilizing
The D2D communication technologys carry out network trunk access, user's access is also had the microcellulor network of surplus resources, obtain Internet resources.
Communicated more than flow transhipment technology in presently relevant research based on single-hop D2D.And the communication distance of single-hop D2D communications
It is extremely limited, it is relatively specific for the network scenarios [1] [2] [3] that user in network was uniformly distributed or obeyed a certain specific distribution.
But in the application scenarios of many honeycomb heterogeneous networks, user is not necessarily all equally distributed, but is more intensively distributed in
In some hot spot regions, other area distributions are then less (such as：Market, teaching building and Conference Hall etc.).For such field
For scape, if user of the integrated distribution in hot spot region only uses the flow transhipment technology communicated based on single-hop D2D, then no
There can be very big access contention only between user, and many users will be unable to be relayed to the idle micro-cellular network outside hot spot region
Network.
Therefore, the problem of prior art is present be：For network internal storage user's integrated distribution (hot spot region) isomery
Cellular network scene, can cause there is very big access contention, network load between user based on the flow transhipment that single-hop D2D communicates
It is unbalanced.
The content of the invention
It is an object of the invention to provide a kind of cellular network flow conveyer method communicated based on multi-hop D2D, make presence
The honeycomb heterogeneous network of user's integrated distribution keeps load balancing.
The technical solution for realizing the object of the invention is：
A kind of cellular network flow conveyer method communicated based on multi-hop D2D, is comprised the following steps：
(10) surplus resources list is set up：Cellular network base station asks all microcellulor networks to upload surplus resources situation,
And set up surplus resources list；
(20) the most NetFinds of surplus resources：Cellular network base station finds surplus resources most according to surplus resources list
Many microcellulor networks；
(30) relaying access：According in free node in connection request node and the most microcellulor network of surplus resources
After link-quality, the best repeated link of selection link-quality carries out relaying access.
Compared with prior art, its remarkable advantage is the present invention：
The honeycomb heterogeneous network that there is user's integrated distribution is set to keep load balancing.
The present invention is directed in honeycomb heterogeneous network because user has integrated distribution and causes network load is unbalanced to ask
Topic proposes that carrying out flow relaying using the multi-hop D2D communication technologys transports, remaining with microcellulor when carrying out the selection of D2D relay routes
Resource and network link quality as relay route Combination selection standard.By applying this method, during user can be made preferential
After access the more microcellulors of surplus resources come reduce user in hot spot region microcellulor resource seize, reduce user
Between relaying access interference.Be shown experimentally that, with traditional honeycomb heterogeneous network pattern (no flow transhipment strategy) and with away from
Compared from the method as relaying routing standard, the present invention can further increase on the premise of guaranteeing QoS of customer
The overall throughput and user's access rate of system.
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
Brief description of the drawings
Fig. 1 is main flow chart of the present invention based on the multi-hop D2D cellular network flow conveyer methods communicated.
Fig. 2 is the flow chart of the most NetFind steps of surplus resources in Fig. 1.
Fig. 3 is the flow chart of relaying access step in Fig. 1.
Fig. 4 is honeycomb heterogeneous network model configuration diagram.
Embodiment
As shown in figure 1, the cellular network flow conveyer method that the present invention is communicated based on multi-hop D2D, comprises the following steps：
(10) surplus resources list is set up：Cellular network base station asks all microcellulor networks to upload surplus resources situation,
And set up surplus resources list；
Being described as follows based on the relay traffic transhipment honeycomb heterogeneous system model configuration that multi-hop D2D communicates in the present invention：
Two distinct types of network is included in network altogether, is that traditional cellular network and M network coverage are less micro- respectively
Cellular network (i.e. Pico cell).Cellular network and microcellulor network have different usable spectrum resource quantities, and in system
The overall usable spectrum resource quantity of network after initializing set is carried out no longer to change.Microcellulor network timing in network is to honeycomb
Network uploads its surplus resources situation, and cellular network carries out the residual resource information of all microcellulor networks in the form of a list
Storage, and upgraded in time according to the situation of upload.N number of user is unevenly dispersed with network, each user is with identical
Probability sends connection request to network and service quality to network has basic requirement.In cellular network coverage
There is hot spot region, user can integrated distribution causes the network of hot spot region in hot spot region according to actual subjective demand
Load is higher, and the microcellulor network in hot spot region is designated as η by the present invention.Outside hot spot region, user distribution is relatively disperseed, net
Network load is relatively low.Assuming that cellular network is in full load condition, no surplus resources are supplied to user access network, and exist micro-
Cellular network also has surplus resources.If terminal user is apart from the coverage that D2D communicates, then can set up each other
D2D communication links carry out flow transhipment.D2D communicates by cellular network control, and the communication resource uses cellular network resource.In network
It is different comprising cellular network communication, microcellulor network service, via node and microcellulor network service and D2D communications etc. altogether
Communication pattern, wherein D2D communication is carried out data transmission using up-link, the interference in network be also these four communication patterns it
Between the interference that produces.Phone user and microcellulor user work under OFDMA patterns, and the user in identical network is using just
Channel is handed over, thus it is noiseless each other.In addition, it is contemplated that the fading characteristic of wireless channel, more compared to single-hop D2D communications
Jumping the performances such as the delivery rate and time delay of D2D communications can all decline, therefore to ensure service quality, the present invention considers that user exists
When carrying out flow transhipment using the multi-hop D2D communication technologys, maximum D2D communication hop counts are no more than double bounce.
(20) the most NetFinds of surplus resources：Cellular network base station finds surplus resources most according to surplus resources list
Many microcellulor networks；
As shown in Fig. 2 the most NetFind steps of (20) surplus resources include：
(21) surplus resources list judges：Whether be empty, in this way, then going to (22) can not connect if judging surplus resources list Lx
Enter to point out step；Otherwise, the most microcellulor network PBSi of surplus resources is found；
(22) prompting can not be accessed：It was found that connection request node x can not access the prompting of cellular network, (10) are gone to remaining
The Resources list establishment step.
(30) relaying access：According in free node in connection request node and the most microcellulor network of surplus resources
After link-quality, the best repeated link of selection link-quality carries out relaying access.
As shown in figure 3, described (30) relaying access step includes：
(31) primary link quality evaluation：For in any microcellulor network PBSi coverages most in surplus resources
Free node Ni, if communication distance between connection request node x and Ni is less than d2d communication distances, according to link data
Transmission rate, assesses the main repeated link quality between connection request node x and free node Ni；
(32) primary link relaying access：If meeting network threshold in the absence of repeated link in all potential repeated links
Value Cth, then go to (33) step；Otherwise, the repeated link progress relaying that connection request node x selects link-quality best connects
Enter；
(33) secondary link-quality is assessed：In the microcellulor network PBSi coverages most for being in surplus resources together
Another any free node Nj, if its be in free node Ni d2d communication coverages in, and with connection request node x
Between communication distance be less than d2d communication distances, then according to link data transmission rate, assess the pair between connection request node x and Ni
Repeated link quality；
(34) secondary link trunking access：If meeting network threshold in the absence of repeated link in all potential repeated links
Value Cth, cellular network base station deletes the most microcellulor network PBSi of surplus resources from surplus resources list Lx, and goes to
(20) the most NetFind steps of surplus resources；Otherwise, connection request node x selects the best repeated link of link-quality to carry out
Relaying access.
Fig. 4 is honeycomb heterogeneous network model configuration diagram.In honeycomb heterogeneous network, network service quality is all users
One significant concern point.In the honeycomb heterogeneous system model that is considered of the present invention, when the user in network by D2D relayings come
When accessing microcellulor network, in order to ensure the network service quality of user, the selected repeated link of user is sent up to data
Rate has to the threshold value higher than network provision.Repeated link Li path via node number is defined as RN, by Li up to number
C is defined as according to transfer rateLi.For any microcellulor network PBSiFor, its resource utilization isWherein
Rallocate=Rlte+Rd2dFor PBSiThe frequency spectrum resource of (occupied), R are distributedlteRepresent micro- honeybee of microcellulor network user occupancy
Nest network PBSiFrequency spectrum resource, Rd2dRepresent that user accesses microcellulor network PBS by D2D patternsiShared frequency spectrum resource；
RtotalRepresent microcellulor network PBSiWhole available frequency spectrum resources.Based on defined above, cellular network problem of load balancing is just
It can model and be described as in link data transmission rate CthPass through optimal multi-hop D2D under constraints (maximum hop count is double bounce)
Relay selection method makes all microcellulor resource utilization summations in network realize maximized problem, and optimization aim expression formula is such as
Under：
s.t.
Rallocate≤Rtotoal
Rlte,Rd2d∈{0,1,2....Rtotoal}
RN∈{1,2}
CLi≥Cth
First constraints is so that the occupied frequency spectrum resource numbers of PBS is less than PBS frequency spectrum resources sum.Second about
Beam condition shows Rlte,Rd2dIt is 0 to RtotalNonnegative integer in interval.3rd constraints indicates repeated link in network
D2D hop counts be double bounce to the maximum.Last constraints make it that the repeated link data transfer rates of all user's selections are necessary
More than network threshold, to ensure the QoE of user.
For the transmission loss of data, the present invention has considered path loss and shadow fading the two factors.Path
Loss uses the path loss model based on transmission range, for the user using honeycomb and microcellulor pattern communication, its
Path loss is：L (d) (dB)=40.9+37.6lg (d)+26lg (fc/ 5), wherein d is user to the distance of respective base station, fc
For carrier frequency.For the user using D2D trunking traffics, the path loss between D2D communications is：L (d) (dB)=79+
40lg(d)+30lg(fc), wherein d is distance, f between D2D usercFor carrier frequency.For shadow fading, used herein is
The just lunar shadow fading model of typical logarithm：X=A*r1+B*r2, wherein A and B are coefficient correlation, r1And r2Become for standard gaussian
Amount, the standard deviation of shadow fading is 10dBm.
So that ensure the service quality of network, only when the data transfer rates of node are more than given threshold value, network is recognized
Meet and require for repeated link, it is possible to use the link trunking access network.Arbitrary node in network is understood by Shannon's theorems
Data available transfer rate is：
Cmax=W*log2(1+γ) (1)
(1) W is channel width in formula, and γ is signal to noise ratio.Designed transhipment strategy interior joint passes through relay access network network
Maximum D2D communication hop count be no more than double bounce.It is assumed that there is user A, user B and user C, wherein user A please to send connection
The user asked, and expect to relay by user B and user C double bounce with D2D patterns to access microcellulor network P, then user A
Reachable data transmission rate is on this repeated link：
maxCAmax=min (Wlog2(1+γB),Wlog2(1+γC),Wlog2(1+γPBS)) (2)
(2) γ in formulaBFor the value of user's B snr of received signal, γCFor the value of user's C snr of received signal, PBS tables
Show microcellulor network P base station, and γPBSFor the value of PBS snr of received signal.And when user A is accessed with D2D communication patterns
During microcellulor network P, the Signal-to-Noise that user B, user C and PBS are received respectively is respectively：
(3), the P in (4) and (5) formulaA、PBAnd PCPhone user A, B and microcellulor user C transmitting work(are represented respectively
Rate, Gm,nAnd Gm,PBSRepresent respectively user m to user n carry out data transmission when retrievable overall channel gains and user m to micro-
Overall channel gains between cellular basestation PBS, SB、SCAnd SPBSWhen representing the non-access network of user A respectively, phone user B, microcellulor
The signal strength values that user C and PBS are received.And SB、SCAnd SPBSRespectively：
SB=N0+PmGm,B (6)
(6), the N in (7) and (8) formula0Represent white Gaussian noise, PmRepresent the corresponding transmission power of cellular network subscriber, Pp
Represent the corresponding transmission power of user, F in microcellulor networkpRepresent the available frequency hop count of any microcellulor network.More than being based on
Expression formula can in the hope of any one repeated link in network peak data transfer rate maxCmax。
Although cellular network also has without the microcellulor network that surplus resources are supplied in user access network, network
Surplus resources.For the user for sending connection request, D2D technologies can be used to be relayed, allow it to access micro-cellular network
Network obtains service.System model regulation in the present invention, if all microcellulor networks for also having surplus resources receive user's
The access request of connection request, then consenting user.By integrated distribution in hot spot region can trunk subscriber be divided into two classes：The first kind
User has the ability to relay microcellulor network more idle outside access hot spot region by D2D；Equations of The Second Kind user is due to distributing position
And the factor such as link-quality can not relay the idle microcellulor network outside access hot spot region by D2D, and it can only relay and connect
Enter the microcellulor network η in hot spot region.Multi-hop D2D relay traffics based on surplus resources transport algorithm with the micro- honeybee of network
The first standard that the surplus resources of nest are selected as D2D relay routes, the user for sending connection request is surplus according to all microcellulors
Remaining resource number sequentially attempt relaying access, rather than the prioritizing selection microcellulor nearest apart from user accessed.I.e.
For the first kind user in hot spot region, prioritizing selection is distributed in outside hot spot region surplus resources most by its access
Many microcellulor networks.It so can as far as possible evade and produce access interference with Equations of The Second Kind user, improve resource utilization.It is simultaneously
Ensure the service quality of user, when carrying out the selection of D2D relay routes, the node in network is needed to all potential relaying chains
Road quality is estimated, the second standard that link-quality is selected as relay route.Only when the quality of repeated link can
When meeting the basic demand of user, node can just select the optimal path of link-quality to carry out relaying access, realize that flow is transported.
Claims (3)
1. a kind of cellular network flow conveyer method communicated based on multi-hop D2D, it is characterised in that comprise the following steps：
(10) surplus resources list is set up：Cellular network base station asks all microcellulor networks to upload surplus resources situation, and builds
Vertical surplus resources list；
(20) the most NetFinds of surplus resources：Cellular network base station finds surplus resources most according to surplus resources list
Microcellulor network；
(30) relaying access：According to the relaying chain of free node in connection request node and the most microcellulor network of surplus resources
Road quality, the best repeated link of selection link-quality carries out relaying access.
2. flow conveyer method according to claim 1, it is characterised in that the most NetFinds of (20) surplus resources
Step includes：
(21) surplus resources list judges：Judge surplus resources list LxWhether it is empty, in this way, then goes to (22) and can not access and carry
Show step；Otherwise, the most microcellulor network PBS of surplus resources is foundi；
(22) prompting can not be accessed：It was found that connection request node x can not access the prompting of cellular network, (10) surplus resources are gone to
List establishment step.
3. flow conveyer method according to claim 1, it is characterised in that (30) relaying access step includes：
(31) primary link quality evaluation：For any microcellulor network PBS most in surplus resourcesiIn coverage from
By node NiIf, connection request node x and NiBetween communication distance be less than d2d communication distances, then sent according to link data
Rate, assesses connection request node x and free node NiBetween main repeated link quality；
(32) primary link relaying access：If meeting network threshold in the absence of repeated link in all potential repeated links
Cth, then (33) step is gone to；Otherwise, connection request node x selects the best repeated link of link-quality to carry out relaying access；
(33) secondary link-quality is assessed：The microcellulor network PBS most for being in surplus resources togetheriIt is another in coverage
Any free node NjIf it is in free node NiD2d communication coverages in, it is and logical between connection request node x
Communication distance is less than d2d communication distances, then according to link data transmission rate, assesses connection request node x and NiBetween secondary relaying chain
Road quality；
(34) secondary link trunking access：If meeting network threshold in the absence of repeated link in all potential repeated links
Cth, cellular network base station is by the most microcellulor network PBS of surplus resourcesiFrom surplus resources list LxIt is middle to delete, and go to
(20) the most NetFind steps of surplus resources；Otherwise, connection request node x selects the best repeated link of link-quality to carry out
Relaying access.
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