CN105072620A - Network visualization-based resource sharing method among service providers - Google Patents

Abstract

The invention discloses a network visualization-based resource sharing method among service providers. The method includes the steps: providing an SDN-based network visualization structure, designing a method for resource sharing among different service providers through base station visualization on the basis of the network structure, determining through calculation whether a base station meets a visualization trigger condition, performing base station visualization if the base station meets the visualization trigger condition, and switching UE that meets a switch condition in a heavily loaded community to base stations of medium-sized or light loaded communities of other service providers. According to the resource sharing method, the frequency spectrum resource utilization rate can be effectively improved, and the system throughput and the virtualization cost can be balanced by setting different base station visualization trigger conditions.

Description

Resource share method between virtualized operator Network Based

Technical field

To the present invention relates in network virtualization resource-sharing problem between operator, belong to the network virtualization technical field in radio communication.

Background technology

In recent years, along with smart mobile phone, notebook is day by day universal with other wireless devices, and the demand of Mobile data sharply increases.In order to improve mobile network's capacity to meet demand data, Mobile Network Operator employs many technology, as the wide-band air interfaces technology using multiple-input and multiple-output (MultipleInputMultipleOutput, MIMO) system to obtain higher rate, small-sized honeycomb technology etc.But these technology improve capital and the operation expenditure of network, add network complexity.In addition, the method improving power system capacity by obtaining new radio spectrum resources also needs a large amount of up-front investments.Network virtualization technology, by multiple operators share spectrum resources and infrastructure, while raising resource utilization and throughput of system, decreasing capital and the operation expenditure of network, having started brand-new situation for solving this problem.Software defined network (SoftDefinedNetwork, SDN), by uneoupled control plane and datum plane and introduce centralized control plane, is considered to realize one of the most promising technology of network virtualization.

Network virtualization refers to can be abstract and be divided into multiple mutually isolated virtual network resource by the technology in many ways shared by physical resource.Traditional Internet Service Provider is divided into into two new roles by network virtualization: infrastructure network provider (InfrastructureProvider, InP) and service provider (ServiceProvide, SP).SP sets up virtual network to provide various service by leasing resource to InP.Network virtualization significantly improves resource utilization, the decoupling zero of practical function and facility, is easy to the expansion and the management that realize new service and product, thus reduces facilities and administration cost.

SDN is a kind of new network framework, be the network architecture that a kind of network control and data retransmission are separated, and network control function possesses programmable features, can pass through software program configuration network function neatly.Although SDN and network virtualization are different technology, the two is highly complementary.So SDN and network virtualization being combined extremely is necessary for the opportunities and challenges successfully managing future network.SDN is applied in network virtualization, is conducive to the optimization realizing control and migration efficiency, improves the programmability of network virtualization.

Base station virtualization, as the virtualized a kind of implementation in networking, can realize frequency spectrum between different operators and facility is shared.Utilize the network architecture of SDN, the isolation between the centralized control of base station virtualization and different operators can be realized and customize service.Based in the base station virtualization of SDN, need to provide the changing method of subscriber terminal equipment (UserEquipment, UE) after concrete base station virtualization method and base station virtualization.Further, base station virtualization also has expense, needs to design a kind of method and realizes improving the balance between systematic function and minimizing virtualization overhead.

Summary of the invention

The object of this invention is to provide the resource share method between different operators in a kind of network virtualization, design a kind of base station virtualization and virtual rear user's changing method, whether carry out virtual, and realize resource-sharing by UE switching after setting up virtual base station if whether meeting the decision of virtual trigger condition according to base station between different operators.Adopt the resource share method in the present invention, effectively can improve frequency spectrum resource utilization rate, realize the balance between throughput of system and virtualization overhead by the virtual trigger condition of setting different base station simultaneously.

First the present invention provides a kind of network virtualization framework based on SDN, based on this network architecture, to design between a kind of different operators base station virtualization to realize the method for resource-sharing, judge whether base station meets virtual trigger condition according to calculating, if meet, carry out base station virtualization and the UE meeting switching condition in heavy duty community is switched in the virtual base station of the medium of other operators or underload community.

1 based on the network architecture of SDN

As shown in Figure 1, network is divided into two planes: control plane and datum plane.

Control plane is made up of three parts: controller, database and network virtualization assembly.Different operators controls their network by the network controller of oneself.Can communicate between controller, with exchange message.For simplicity, the controller of Liang Ge operator A and B is only drawn in Fig. 1.The database purchase abstract topological structure of whole network, and the information about base station and user to collect from datum plane (such as, the position of base station, transmitting power, Physical Resource Block (PhysicalResourceBlock, PRB) service condition, the Signal to Interference plus Noise Ratio (SignaltoInterferenceplusNoiseRatio, SINR) etc. of user.Network virtualization assembly comprises two modules: computing module and decision-making module.Computing module primary responsibility utilizes the data in database to calculate the UE quantity meeting switching condition, then they is sent to decision-making module.Decision-making module judges whether UE quantity meets virtualized trigger condition, if meet, sends a signal to base station and controller carries out virtual.

Datum plane is made up of the base station of various heterogeneous network, and these base stations are only responsible for forwarding and collecting data.

2 cell load definition and classification thereof

Base station virtualization method of the present invention carries out resource-sharing in the uneven situation of the cell load of different operators, first needs the definition providing cell load.Cell load ρ is by the PRB sum N of this community _pRBwith the PRB number N that Yi Beigai community UE takies _{uE_PRBs}definition:

$\mathrm{\ρ}=\frac{N_{PRBs}}{N_{UE\_PRBs}}---\[1\]$

For the different situations of cell load ρ, littlely divide into following three kinds:

A, heavy duty community.If cell load ρ meets 0.9< ρ≤1, Ze Gai attaches most importance to community loaded cell.

B, medium load community.If cell load ρ meets 0.5< ρ≤0.9, Ze Gai community is medium load community.

C, underload community.If cell load ρ meets 0≤ρ≤0.5, Ze Gai community is underload community.

Resource share method between 3 operators

To suppose in following scene load imbalance between different operators, attach most importance to loaded cell in most of communities of operator A, and most of communities of operator B are medium or underload community.Base station in the medium or underload community of operator B virtually can turn to two virtual base stations, one for serving the UE of this community, another is for operator A.The UE of the heavy duty community of operator A is switched to virtual base station, even if the SINR value after their switching is a little less than the SINR value in former community.Concrete base station virtualization process is as follows:

1) if i-th of operator A community to attach most importance to loaded cell, base station send measurement configuration information to the UE of this community.If in a kth UEu _kalso in the jGe community of operator B coverage in, and for medium or underload community, then UEu _kto be measured it in this community in SINR value with it in operator B community in SINR value

${\mathrm{SINR}}_C\left(u_k\right)=\frac{P_C{H}_x{x}^{-\mathrm{\&alpha;}}}{I_C+N_0},C=C_i^A,C_j^B---\&lsqb;2\&rsqb;$

Wherein P _cbe the transmitting power of C base station, community, x is UEu _kto the distance of C base station, community, H _xthat C base station, community is to UEu _kchannel gain, α is path loss index, N ₀it is noise power.Because operator A, B are alien frequencies, so I _crepresent that user receives the interference from other communities C' in operator A or B,

$I_C=\underset{C^{\&prime;}\&NotEqual;C}{\&Sigma;}{P}_{C^{\&prime;}}{H}_y{y}^{-\mathrm{\&alpha;}}---\&lsqb;3\&rsqb;$

Wherein, P _c'be the transmitting power of other communities C', y is UEu _kto the distance of C' base station, other communities, H _ythat C' base station, other communities is to UEu _kchannel gain.Community two SINR value will measuring of UE with be reported to community base station.

2) community base station the SINR value received is sent to the database of control plane.Community base station by it not by PRB quantity N that UE takies _leftsend to database.Under database purchase, these information are for other assemblies of control plane.Meanwhile, community to send virtual request signal to network virtualization assembly oneself be that heavy duty community needs a virtual base station to inform in base station.

3) reducing too many to prevent setting up the virtual rear SINR value switching UE in the past, in the computing module of network virtualization assembly, setting a UE handoff threshold SINR _thres(this thresholding can be set according to network condition by operator), the UE only met the following conditions just likely is switched to virtual base station after setting up virtual base station:

${\mathrm{SINR}}_{C_j^B}\left(u_k\right)-{\mathrm{SINR}}_{C_i^A}\left(u_k\right)>{\mathrm{SINR}}_{thres}---\&lsqb;4\&rsqb;$

Computing module statistics meets above UE switching condition UE quantity N _v, and send it to decision-making module.

4) in order to weigh virtualization overhead and throughput of system, the decision-making module of network virtualization assembly sets a virtual triggering thresholding θ (this thresholding can be set according to network condition by operator), only works as N _vwhen being greater than this threshold value, decision-making module just determines that triggering is virtual, namely

N _v＞θ[5]

After virtual triggering, decision-making module sends a signal to the base station of operator B base station virtually turn to two virtual base stations, and by it not by N that UE takies _leftindividual PRB distributes to another virtual base station and uses for operator A.

5) decision-making module sends a signal to database and controller and upgrades information about virtual base station, and the controller of operator A sends a signal to its community base station, base station will meet the UE of UE switching condition according to SINR gain descendingly switch to virtual base station successively until virtual base station PRB uses up or the UE that meets switching condition has all switched.

The present invention has following beneficial effect: the present invention, according to the network architecture based on SDN, gives a kind of method of being carried out resource-sharing between different operators by base station virtualization.Determine whether to carry out base station virtualization according to the virtual trigger condition provided, and after carrying out base station virtualization, the UE meeting switching condition is switched to virtual base station.

Based in network virtualization of the present invention between operator Resources Sharing tool have the following advantages:

1., in the uneven situation of load, realize the sharing frequency spectrum resource between different operators by the mode of base station virtualization, improve resource utilization.

2. the UE meeting virtual condition being switched to virtual base station makes more user to be served.

3. while guarantee throughput of system improves, the expense of base station virtualization can be reduced by the virtual trigger condition that setting is different.

4., while realizing resource-sharing, the isolation between each operator can also be realized and customize service.

Accompanying drawing explanation

Fig. 1 is the network architecture schematic diagram based on SDN.

Embodiment

Embodiments of the present invention are as follows:

1) heavy duty cell base station sends measuring-signal and measures to its UE, UE and calculate it according to formula [6] in this carrier cell and the SINR value in the non-heavy duty community of other operators SINR value is reported to base station.

${\mathrm{SINR}}_{C_j^B}\left(u_k\right)-{\mathrm{SINR}}_{C_i^A}\left(u_k\right)>{\mathrm{SINR}}_{thres}---\&lsqb;6\&rsqb;$

2) SINR value that UE records by heavy duty cell base station sends to the database of control plane, simultaneously the PRB number N that will do not taken by UE of the non-heavy duty community of other operators _leftsend to database.These information of database purchase.Meanwhile, heavy duty community sends virtual request signal to the virtual parts of control plane.

3) computing module in network virtualization assembly calculates the UE number N meeting UE switching condition formula [7] _v, then send it to the decision-making module in network virtualization assembly.

${\mathrm{SINR}}_{C_j^B}\left(u_k\right)-{\mathrm{SINR}}_{C_i^A}\left(u_k\right)>{\mathrm{SINR}}_{thres}---\&lsqb;7\&rsqb;$

4) decision-making module in network virtualization assembly judges N _vwhether be greater than virtual triggering thresholding θ (formula [8]), if be greater than, send a signal to the non-heavy duty cell base station of other operators, base station virtualization is two virtual base stations, one for oneself, another distributes N _leftindividual PRB is for heavy duty community.

N _v＞θ[8]

5) decision-making module in network virtualization assembly sends a signal to database and controller upgrades virtual base station information.Operator's controller belonging to heavy duty community sends a signal to the base station of this heavy duty community, and the UE meeting UE switching condition is switched to virtual base station until virtual base station PRB uses up or the UE that meets switching condition has all switched according to SINR gain is descending by base station successively.

Claims (2)

1. a resource share method between virtualized operator Network Based, is characterized in that, attach most importance to loaded cell in most of communities of operator A, and most of communities of operator B are medium or underload community; Base station in the medium or underload community of operator B virtually can turn to two virtual base stations, one for serving the UE of this community, another is for operator A; The UE of the heavy duty community of operator A is switched to virtual base station, even if the SINR value after their switching is a little less than the SINR value in former community.

2. resource share method between virtualized operator Network Based according to claim 1, it is characterized in that, concrete base station virtualization process is as follows:

1) if i-th of operator A community to attach most importance to loaded cell, base station send measurement configuration information to the UE of this community.If in a kth UEu _kalso in the jGe community of operator B coverage in, and for medium or underload community, then UEu _kto be measured it in this community in SINR value with it in operator B community in SINR value

${\mathrm{SINR}}_C\left(u_k\right)=\frac{P_C{H}_x{x}^{-\mathrm{\&alpha;}}}{I_C+N_0},C=C_i^A,C_j^B---\&lsqb;2\&rsqb;$

Wherein P _cbe the transmitting power of C base station, community, x is UEu _kto the distance of C base station, community, H _xthat C base station, community is to UEu _kchannel gain, α is path loss index, N ₀it is noise power.Because operator A, B are alien frequencies, so I _crepresent that user receives the interference from other communities C' in operator A or B,

$I_C=\underset{C^{\&prime;}\&NotEqual;C}{\&Sigma;}{P}_{C^{\&prime;}}{H}_y{y}^{-\mathrm{\&alpha;}}---\&lsqb;3\&rsqb;$

Wherein, P _c'be the transmitting power of other communities C', y is UEu _kto the distance of C' base station, other communities, H _ythat C' base station, other communities is to UEu _kchannel gain.Community two SINR value will measuring of UE with be reported to community base station;

2) community base station the SINR value received is sent to the database of control plane; Community base station by it not by PRB quantity N that UE takies _leftsend to database.Under database purchase, these information are for other assemblies of control plane; Meanwhile, community to send virtual request signal to network virtualization assembly oneself be that heavy duty community needs a virtual base station to inform in base station;

3) reducing too many to prevent setting up the virtual rear SINR value switching UE in the past, in the computing module of network virtualization assembly, setting a UE handoff threshold SINR _thres, this thresholding can be set according to network condition by operator, and the UE only met the following conditions just likely is switched to virtual base station after setting up virtual base station:

${\mathrm{SINR}}_{C_j^B}\left(u_k\right)-{\mathrm{SINR}}_{C_i^A}\left(u_k\right)>{\mathrm{SINR}}_{thres}---\&lsqb;4\&rsqb;$

Computing module statistics meets above UE switching condition UE quantity N _v, and send it to decision-making module;

4) in order to weigh virtualization overhead and throughput of system, the decision-making module of network virtualization assembly sets a virtual triggering thresholding θ, and this thresholding can be set according to network condition by operator, only works as N _vwhen being greater than this threshold value, decision-making module just determines that triggering is virtual, namely

N _v＞θ[5]

After virtual triggering, decision-making module sends a signal to the base station of operator B base station virtually turn to two virtual base stations, and by it not by N that UE takies _leftindividual PRB distributes to another virtual base station and uses for operator A;

5) decision-making module sends a signal to database and controller and upgrades information about virtual base station, and the controller of operator A sends a signal to its community base station, base station will meet the UE of UE switching condition according to SINR gain descendingly switch to virtual base station successively until virtual base station PRB uses up or the UE that meets switching condition has all switched.