CN103987066B - Head node system of selection based on outage probability and differential channel quality configured information - Google Patents
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Abstract
The invention discloses a kind of head node system of selection based on outage probability and differential channel quality configured information, it is related to the communication technology, the present invention proposes that correct node is selected.The roughing that OP methods carry out user is first passed through, the less UE of outage probability in cell was both drawn plus conditional probability by the power gain thresholding in channel capacity；Then carried out by IWF selected, between community user by OP roughings after, feedback trade quality indication (CQI) information gives eNodeB (base station), draw differential channel quality configured information, obtain disturbing weighted factor using differential channel quality configured information, obtain disturbing less UE (user) eventually through interference weighted factor, be both head node.In the environment of due to being mobile cooperation cloud, so the selection of head node is dynamic monitoring, real-time update.The head node outage probability so selected is small, and the availability of frequency spectrum is high, and handling capacity is big, enhances the effect that head node is formed a connecting link in mobile cooperation cloud.
Description
Technical field
The present invention relates to mobile communication technology field, in particular, this distribution is related to a kind of wireless mobile that is used for and cooperated
Head node system of selection in network
Background technology
With developing rapidly for mobile communication, collaboration communication turns into a focus, CoMP in new generation of wireless communication
(coordinated multi-point, coordinate multipoint) has been obtained for skillful application in LTE-A, in face of a new generation's shifting
The higher requirement of dynamic communication, while the requirement to collaboration communication is also just higher.Traditional collaboration communication is to be based on base station and base
Between standing, two kinds of Combined Treatment and wave beam forming are generally divided into.The collaboration communication of a new generation is not only to be based on base station and base station
Between, and cooperating between user's group and user's group is also added between user and user, it is exactly this to be layered different work movement cloud system
A kind of cooperation communication system of sample.Heterogeneous hierarchical movement cloud system is different from traditional Turbo Detection for Cooperative Communication, and it is further system
It is subdivided into two layers, one layer is that, based on the head node layer cooperated between user and user, another layer is to be based on user's group and user's group
Between cooperate child node layer.Every layer of progress resource-sharing, and dynamic monitor, real-time update, it is ensured that head node energy are carried out to node
Give child node transmission information.
In heterogeneous hierarchical cooperation cloud system, one of the problem of selection of the base station to head node is most critical must protect
The performance for demonstrate,proving head node is good enough, it is ensured that the outage probability of head node is smaller, disturbs smaller, could be between second layer user's group
Set up good communication.
In existing technical scheme, for the selection of head node, it can be needed by signal to noise ratio with reference to different service types
The packet wanted, the need for the guarantee of signal to noise ratio and business data transmission in terms of two, analyzes existing user grouping algorithm
The performance indications such as the bit error rate, to select the more preferable head node of performance.Some technical schemes are to add the consideration of power.Propose
Environment sensing first search algorithm, more effectively head node is selected by using CCS (Cooperation controlling server).
In fact, except signal to noise ratio and power, the outage probability and handling capacity of head node these be very in the field of communications
Crucial the problem of, because head node in addition to having data exchange each other, also to transmit data to child node.In recent years, occur
The analysis of collaboration communication outage probability and a kind of choose inter-cell interference most in the way of differential channel quality configured information
Small user, more efficient head node can be only by interrupting the more preferable head node of lower and channel quality.
The content of the invention
The deficiency of the prior art for more than, it is an object of the invention to provide a kind of packet sending speed is fast, testing efficiency
High method, technical scheme is as follows：A kind of head node based on outage probability and differential channel quality configured information
System of selection, it comprises the following steps：
101st, macrocellular network includes n Micro-cell, and each Micro-cell includes a base station eNodeB
With several node users, the Micro-cell is used in Hierarchical Mobile cooperation cloud access network, the microcellulor network
Base station eNodeB sends request data package to node users, and the node users, which are received, draws each microcellulor after request data package
The signal to noise ratio snr of channel, channel quality indicator (CQI), pre-coding matrix instruction information PMI and channel between cell and node users
Fading coefficientsWherein S represents source node, is herein base station eNodeB, and i represents that i-th of node in Micro-cell is used
Family；
102nd, setting packet rate R and its threshold valueSignal to noise ratio snr and channel according to being obtained in step 101 decline
Fall coefficientCalculate channel capacityWhen the power gain of the channel of node usersIt is less than
Threshold valueJust using this node users as cooperative node, several cooperative nodes constitute cooperation domain C (s), wherein| C (s) | the cooperative node number chosen in C (s) is represented, | C
(s) | ∈ 0,1 ..., and M }, cooperation outage probability is calculated according to formula
103rd, by the cooperation outage probability P obtained in step 102SOP| C (s) | } descending sort is carried out, and it is general to select interruption
Rate PSOP{|C(s)|}<A1, as SINR=20, A1 values be 0.025, user's group | C (s) |nAs roughing head node, and
101 more new nodes are returned to using dynamic monitoring；
104th, cellular communication system cell general power S is obtainedt, channel gain H of the source node S to i-th of usersi, i-th
The pre-coding matrix M of useri, inter-cell interference PICI, receiving terminal white Gaussian noiseThen in n Micro-cell
The roughing head node of respective cell is sent to the base station of remaining Micro-cell by base station, calculates cooperating in collaboration communication
Channel quality indication (CQI) information Q in cooperation in communicationCoMP：
And according to formula
Calculate differential CQI channel quality indication (CQI) information, wherein Qn(Mi) expression cooperation cell pre-coding matrix be MiNth user
Channel quality indication (CQI) information, Qn(M0) expression cooperation cell pre-coding matrix be M0Nth user channel quality indicate letter
Breath；
105th, when macrocellular network includes 3 Micro-cell, including cell A, cell B, cell C, by step 104
In obtained differential CQI channel quality indication (CQI) information be defined as interference weighted factor ω, ω=k × △ Qn(Mi), k is for weighting
Number, is herein 1, and draw Normalized throughput t=log according to Shannon's theorems2(QA(Mj))+log2(QB(Mj))=log2(QA
(Mj)×QB(Mj)), then draw C community users to A community users and B community users (An,Bn) interference volume ωA×ωB, repeat
Step 105 obtains A cells and the minimum user's set (C of B area interferencesm), similarly cell A and cell B also select interference minimum
User, and cell C user composition user set (Am,Bm,Cm)；
106th, return to step 104, dynamic monitoring updates roughing head node, user's set (Am,Bm,Cm) it is final cephalomere
Point, head node selection is finished, and base station eNodeB is forwarded packet by head node.
Further, in step 102It is 0 to obey average, and real and imaginary parts variance is σ2Multiple Gauss distribution,Obedience parameter is σ2Flat Rayleigh distribution,Obedience average is 2 σ2Exponential distribution,
WhereinRepresentAverage/expectation.
Advantages of the present invention and have the beneficial effect that：
The present invention carries out the roughing of user using OP methods are first passed through, and is both added by the power gain thresholding in channel capacity
Upper conditional probability draws the less UE of outage probability in cell；Then carried out by IWF selected, pass through OP roughings between community user
Afterwards, feedback trade quality indication (CQI) information gives eNodeB (base station), draws differential channel quality configured information, utilizes differential channel matter
Amount instruction information obtains disturbing weighted factor, obtains disturbing less UE (user) eventually through interference weighted factor, is both head
Node.In the environment of due to being mobile cooperation cloud, so the selection of head node is dynamic monitoring, real-time update.So select
Head node outage probability it is small, the availability of frequency spectrum is high, and handling capacity is big, enhances what head node was formed a connecting link in mobile cooperation cloud
Effect
Brief description of the drawings
Fig. 1 is the basic framework figure of the mobile cooperation cloud of the present invention；
Fig. 2 is head node OP rougher process flow charts of the invention；
Fig. 3 is head node IWF refining process flow charts of the invention；
Fig. 4 is overall flow figure of the invention.
Embodiment
Providing a non-limiting embodiment below in conjunction with the accompanying drawings, the invention will be further elaborated.
The present invention is to provide a kind of head node system of selection based on outage probability and differential channel quality configured information.
Reference picture 1 is exactly a kind of Hierarchical Mobile cooperation cloud model.
Hierarchical Mobile cooperation cloud network, is the network with different transport properties and host-host protocol, Hierarchical Mobile cooperation cloud
The core of network is layering, and heterogeneous network is divided into two layers：Head node client layer and user's group layer.As shown in reference picture, institute in figure
Show be under a cell macrocellular network being divided into three Micro-cell, each cell be a heterogeneous hierarchical
User node in cloud access network, network can be operated in cellular mobile communications networks, can also be operated in themselves
Local network short haul connection net in.A part of user in system can receive the data flow from eNodeB, Ran Houtong
Short haul connection is crossed to share with the other users in same packet cloud.The two-layer communication network that system is presented, i.e. honeycomb and short
Range communication network.
It is head node referred to herein as directly to receive the user node from eNodeB data flows in heterogeneous hierarchical movement cloud network,
It is responsible for directly receiving eNodeB data message, data is being transferred to the child node of user's group layer, between head node and child node
All carry out the shared to reduce eNodeB data retransmission times of data.It can be seen that head node rising in heterogeneous hierarchical moves cloud network
The effect of most critical.
Reference picture 2 is head node OP rougher process flow charts of the invention, and this method is mainly included the following steps that：
201：ENodeB sends packet, including SNR to community user；
202：The channel fading coefficient of SNR and i-th of node in 201Source node S is between i-th of node
Outage probability PopIt is defined as channel capacityIt is less than the probability under a certain given speed R
203：Further calculate outage probability：
In the selection of cloud cluster, when the power gain of the channel of via nodeReach a threshold valueBefore
When, just using this node as UE nodes cooperative node, then the possibility of each UE node interrupts is
From (1)
204：Calculate the outage probability in cooperation domain, it is assumed thatIt is 0 to obey average, and real and imaginary parts hair difference is σ2's
Multiple Gauss is distributed,Obedience parameter is σ2Flat Rayleigh distribution, can obtain
ThenObedience average is 2 σ2Exponential distribution.
WhereinRepresentAverage/expectation.
The cooperation domain being made up of selected UE nodes is represented with C (s), | C (s) | represent the UE nodes chosen in C (s)
Number (| C (s) | ∈ 0,1 ..., M }), then UE cooperations outage probability has：
Obtain the outage probability P in cooperation domainSOP| C (s) | } and number of users | C (s) |；
205：Passing through the outage probability P that cooperates in 204SOPSequence；
206：From | C (s) | select the small a part of user's group of outage probability | C (s) |n, it is roughing head node；
207：Due to being that movement cooperates cloud system, it is necessary to which dynamic monitoring, real-time update returns to 201, more new node.
Reference picture 3 carries out the head node concentration step based on differential CQI：
301：The roughing cephalomere point set obtained by 201-207 | C (s) |nStart selected head node；
302：Cell sends packet, including CQI and PMI to eNodeB；
303：ENodeB in 3 cells issues the packet of roughing user the eNodeB of other 2 cell；
304：The Q in collaboration communication in collaboration communication is calculated by packetCoMP：
Wherein StFor system total power, HsiRepresent source node S to the channel gain of i-th of user, MiRepresent i-th of user
Pre-coding matrix, PICIFor inter-cell interference,For receiving terminal white Gaussian noise；
305：Each community user calculates the differential channel quality configured information of other other cells respectively.If using cooperation
Cell precoding matrix is MiNth user channel quality indication (CQI) information be Qn(Mi), using cooperation cell pre-coding matrix
For M0For Qn(M0), then both ratio：
For differential channel quality configured information；
306：Differential CQI in 305 is defined as interference weighted factor ω：
ω=k × △ Qn(Mi) (4)
Visual user n differential CQI is bigger, is disturbed smaller；
307：Assuming that under three cell cooperative scenes, the user of the 1st cell and the 2nd cell is to being expressed as (An,Bn),
It is set to MjThe pre-encoding codeword used for nth user in 3 cells, then according to Shannon's theorems, user A and B normalizing
Change handling capacity and be.
T=log2(1+QA(Mj))+log2(1+QB(Mj)) (5)
In real system, the SINR of scheduled user is much larger than 1, therefore formula (5) can abbreviation be further
T=log2(QA(Mj))+log2(QB(Mj))=log2(QA(Mj)×QB(Mj)) (6)
So, the user throughput sum for maximizing A and B is equivalent to：
maxQA(Mj)×QB(Mj) (7)
According to differential CQI and interference weighted factor ω definition, formula (7) is further equivalent to
maxωA×ωB (8)
So user n of the 3rd cell is to the user of the 1st cell and the 2nd cell to (An,Bn) interference level can be with
Use ωA×ωBRepresent.
308：User's group set (the C for being disturbed minimum in cell C by cell A and B is selected by 307 methodsm)；
309：Similarly cell A and cell B also select the minimum user of interference, and cell C user composition user's set (Am,
Bm,Cm)；
310：Due to being that movement cooperates cloud system, it is necessary to which dynamic monitoring, real-time update returns to 301, renewal head node；
311：User gathers (Am,Bm,Cm) it is final head node
Further, the dispatching priority of 3 community users is together decided on by outage probability and interference weighted factor.3rd
Community user n weighting dispatching priorities γnIt is expressed as
γn=Pn(ωA×ωB) (9)
So, in the fixation collaboration region of M+1 cell composition, gather for the M cell pairing user of determination, the
M+1 community user k weighting dispatching priority is：
The above embodiment is interpreted as being merely to illustrate the present invention rather than limited the scope of the invention.
After the content for the record for having read the present invention, technical staff can make various changes or modifications to the present invention, these equivalent changes
Change and modification equally falls into the inventive method claim limited range.
Claims (2)
1. a kind of head node system of selection based on outage probability and differential channel quality configured information, it is characterised in that including with
Lower step：
101st, macrocellular network includes n Micro-cell, if each Micro-cell include a base station eNodeB and
Dry node users, the Micro-cell uses the base station in Hierarchical Mobile cooperation cloud access network, the Micro-cell
ENodeB sends request data package to node users, and the node users, which are received, draws each Micro-cell after request data package
The signal to noise ratio snr of channel, channel quality indicator (CQI), pre-coding matrix instruction information PMI and channel fading between node users
CoefficientWherein S represents source node, is herein base station eNodeB, and i represents i-th of node users in Micro-cell；
102nd, setting packet rate R and its threshold valueSignal to noise ratio snr and channel according to being obtained in step 101 decline
Fall coefficientCalculate channel capacityWhen the power of the channel of node users increases
BenefitLess than threshold valueJust it assign this node users as cooperative node, several cooperative nodes composition association
Make domain C (s), wherein| C (s) | represent C
(s) the cooperative node number chosen in, | C (s) | ∈ { 0,1 ..., M }, cooperation outage probability is calculated according to formula
103rd, by the cooperation outage probability P obtained in step 102SOP| C (s) | } descending sort is carried out, and select outage probability
PSOP{|C(s)|}<A1 user's group | C (s) |nAs roughing head node, and 101 more new nodes are returned to using dynamic monitoring；
104th, cellular communication system cell general power S is obtainedt, channel gain H of the source node S to i-th of usersi, i-th of user
Pre-coding matrix Mi, inter-cell interference PICI, receiving terminal white Gaussian noiseThen the base station in n Micro-cell will
The roughing head node of respective cell is sent to the base station of remaining Micro-cell, calculate in collaboration communication in collaboration communication
Cooperation in channel quality indication (CQI) information QCoMP：
And according to formulaCalculate
Differential CQI channel quality indication (CQI) information, wherein Qn(Mi) expression cooperation cell pre-coding matrix be MiNth user channel
Quality indication (CQI) information, Qn(M0) expression cooperation cell pre-coding matrix be M0Nth user channel quality indication (CQI) information；
105th, when macrocellular network includes 3 Micro-cell, including cell A, cell B, cell C, it will be obtained in step 104
To differential CQI channel quality indication (CQI) information be defined as interference weighted factor ω, ω=k × Δ Qn(Mi), k is weight coefficient, and
Normalized throughput t=log is drawn according to Shannon's theorems2(QA(Mj))+log2(QB(Mj))=log2(QA(Mj)×QB(Mj)), then
Draw C community users to A community users and B community users (An,Bn) interference volume ωA×ωB, it is small that repeat step 105 obtains A
Area and the minimum user's set (C of B area interferencesm), similarly cell A and cell B also select the minimum user of interference, and cell C
User's composition user's set (Am,Bm,Cm)；
106th, return to step 104, dynamic monitoring updates roughing head node, user's set (Am,Bm,Cm) it is final head node, head
Node selection is finished, and base station eNodeB is forwarded packet by head node.
2. the head node system of selection according to claim 1 based on outage probability and differential channel quality configured information,
It is characterized in that：In step 102It is 0 to obey average, and real and imaginary parts variance is σ2Multiple Gauss distribution,Obey ginseng
Number is σ2Flat Rayleigh distribution,Obedience average is 2 σ2Exponential distribution,
WhereinRepresentAverage/expectation, p () represent outage probability.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101883410A (en) * | 2010-07-20 | 2010-11-10 | 上海交通大学 | Method for selecting relay node in multi-relay wireless network |
| CN101977391A (en) * | 2010-10-15 | 2011-02-16 | 北京邮电大学 | Multiple terminal cooperative communication method in cognition wireless network |
| CN102638872A (en) * | 2012-04-18 | 2012-08-15 | 西安邮电学院 | Relay selection method based on load balancing in cooperation relay network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101883410A (en) * | 2010-07-20 | 2010-11-10 | 上海交通大学 | Method for selecting relay node in multi-relay wireless network |
| CN101977391A (en) * | 2010-10-15 | 2011-02-16 | 北京邮电大学 | Multiple terminal cooperative communication method in cognition wireless network |
| CN102638872A (en) * | 2012-04-18 | 2012-08-15 | 西安邮电学院 | Relay selection method based on load balancing in cooperation relay network |
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