CN106209181A - A kind of method utilizing wavelength reconstruct to improve CoMP performance - Google Patents

A kind of method utilizing wavelength reconstruct to improve CoMP performance Download PDF

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CN106209181A
CN106209181A CN201610602760.9A CN201610602760A CN106209181A CN 106209181 A CN106209181 A CN 106209181A CN 201610602760 A CN201610602760 A CN 201610602760A CN 106209181 A CN106209181 A CN 106209181A
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wavelength
bbu
community
rrh
step
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CN201610602760.9A
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CN106209181B (en
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纪越峰
张佳玮
贾松昊
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北京邮电大学
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022Site diversity; Macro-diversity
    • H04B7/024Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14Spectrum sharing arrangements between different networks

Abstract

The invention provides a kind of method utilizing wavelength reconstruct to improve CoMP performance, belong to wireless communication technology field.The present invention, by reconstructing wavelength, adjusts baseband processing unit BBU and the membership relation of remote radio head RRH, allows the summation of internal user service traffics that the edge customer service traffics of Inter BBU CoMP and wavelength be migrated minimize.The present invention is to realize wavelength reconstruct to provide method based on topological diagram and method based on wavelength weight.Reconstructed by wavelength, alleviate in distributed wireless access network to provide CoMP that access network especially X2 link is formed huge pressure and impact, reduce the link stress between BBU, reduce the service traffics of Inter BBU CoMP user, thus add the handling capacity of community, improve QoS of customer, be integrally improved the bearing capacity of network.

Description

A kind of method utilizing wavelength reconstruct to improve CoMP performance

Technical field

The invention belongs to wireless communication technology field, specifically refer to one and utilize wavelength reconstruct to improve CoMP The method of (Coordinated Multiple Point, coordinate multipoint) performance.

Background technology

In wireless communications, have employed MIMO due to LTE (Long Term Evolution, Long Term Evolution) system (Multiple-Input Multiple-Output, multiple-input, multiple-output) and OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology, the interference between user corresponding in community is the least or can ignore.But it is right For Cell Edge User, the co-channel interference of minizone seriously reduces marginal user performance, and the technical advantage of MIMO is not Can preferably improve cell edge spectrum efficiency, cell-edge performance has been increasingly becoming the bottleneck of systematic function.Based on above-mentioned feelings Condition, cooperative multipoint transmission technology has been incorporated in LTE-A by 3GPP tissue, is used for improving and improve cell edge spectrum efficiency, The performance of the most whole cell system.

The target that coordinate multipoint (Coordinated Multiple Point, CoMP) is transmitted is to combine the sky of multiple communities Line is combined to user's transmission, utilizes diversity technique to improve the handling capacity of edge customer, strengthens conventional cell and prop up for edge Hold and promote mobile user data transmission performance.

Collaboration communication mode according to cooperation point can be divided into inside of base station cooperation (Intra-Site (eNodeB) CoMP And cooperation between base stations (Inter-Site (eNodeB) CoMP) CoMP).In Intra-Site CoMP communication, all of can assist The community made is under the jurisdiction of same eNodeB.Therefore, user data and necessary demodulating information are only in same eNodeB The minizone that BBU (baseband processing unit) administers swaps.In Inter-Site CoMP communication, collaborative operation can be expanded Coverage, more communication node can carry out cooperative transmission and reception.Relatively big yet with cooperation scope, data and letter Channel state information (CSI) exchange between base station can cause the problems such as expense and the time delay of back haul link, additionally, clock and synchronization Control also there is certain difficulty.

In actual application, the cooperative association of minizone becomes the scene that widely cooperates.But in distributed network, Each community has respective digital processing element, so the cooperation of minizone means that this is between several BBU CoMP(Inter-BBU CoMP).And in cloud (centralized) wireless access network, BBU is brought together formation BBU pool. Connect with optical-fiber network between BBU pool and RRH (Remote Radio Head, remote radio head).One BBU can be many Individual RRH provides service, the CoMP (Inter-BBU CoMP) that the CoMP between these RRH is referred to as in BBU.

In CoMP technology, system needs being total to of the data message relating to carrying out user between multiple community and channel information Enjoy and between multiple transmission node resource coordination distribution.Therefore, in LTE-A Radio Access Network CoMP technology for backhaul chain The characteristic on road has higher requirement.

Relevant conclusion has been obtained: multi-cell cooperating processes and can significantly improve in the discussion of 3GPP standardized process The performance of wireless cellular network, effectively reduces the interference of minizone.During CoMP technology realizes, multiple base station is needed to enter Row associating precoding and transmission data signal, and on multiple Resource Block, dispatch the user serviced.Association during this The data stream making user must be shared between all cooperation cell.Therefore to realize the above-mentioned stage, generally require between base station The information that X2 interface carries out big data quantity is mutual.The process of business simultaneously has strict time restriction, so to X2 link Time delay also has the highest requirement.But, these limit for the cost of X2 link and the complexity of realization is huge choosing War.

Summary of the invention

The present invention, based on cloud (centralized) wireless access network, proposes a kind of side utilizing wavelength reconstruct to improve CoMP performance Method, makes more CoMP user can be provided CoMP service (Intra-BBU CoMP) by same BBU by the reconstruct of wavelength.

A kind of method utilizing wavelength reconstruct to improve CoMP performance that the present invention provides, by reconstructing wavelength, adjusts BBU With the membership relation of RRH, allow the internal user business that the edge customer service traffics of Inter-BBU CoMP and wavelength are migrated The summation of flow minimizes.Wherein, carrying out wavelength reconstruct has two kinds of methods, illustrates separately below.

First, the present invention carries out wavelength reconstruct based on topological diagram, it is achieved step is as follows:

Step 1, sets up non-directed graph G=(V, E), and wherein, node V comprises the two kinds of nodes of BBU and RRH in access network, limit E Comprising two kinds, a kind of is the limit between two RRH nodes, and the weight on limit is simultaneously to the user of two RRH request CoMP services Service traffics, another kind is the limit between RRH node and BBU node, and the weight on limit is that the inside that RRH is being serviced by BBU is used Family service traffics.

Step 2, it is judged that the quantity of the BBU node in figure G, whether less than 2, if so, performs step 4;Otherwise, set up virtual Topology, chooses the BBU that business load in BBU is the heaviest, is set to node BBUs, and remaining BBU is merged one virtual joint of formation Point BBUt

Step 3, uses and asks max-flow method to try to achieve node BBUsAnd BBUtBetween minimal cut, according to the division of minimal cut Determine and be subordinated to BBUsRRH;From figure, by BBUsAll remove with the RRH being subordinated to it, remove and BBU simultaneouslysAnd subordinate RRH node be connected limit, by dummy node BBUtSplit into initial condition;Then step 2 is performed.

Step 4, only remains 1 BBU, remaining RRH and this BBU is set up membership relation, method ends in network.

Secondly, the present invention also provides for a kind of wavelength reconstructing method based on wavelength weight, it is achieved step is as follows:

Step 2.1, travels through all of community, it is thus achieved that optimization weight OW of each community, expectation wavelength EW and co-wavelength are adjacent Meet community ACs

If current area is Vi, record the service traffics of the internal user of wavelength current for Vi and Vi;Find and have with Vi All community Vj of CoMP relation, record each wavelength current for community Vj, and apply for CoMP service between Vj and Vi of community The service traffics of user;Then the user traffic recording Vi and Vj is added according to the wavelength of community, will tool Have identical base band user traffic be added;Find out user traffic is maximum after addition wavelength as community Optimization weight OW of Vi, corresponding wavelength is expectation wavelength EW, and all and expectation wavelength co-wavelength community Vj is defined For co-wavelength abutting subdistrict ACs

Step 2.2, sets up a list L according to optimization weight OW of each community order from big to small, selects to optimize The community that weight is maximum, is reconstructed into the expectation wavelength EW of this community, then by this community and this community by the wavelength of this community ACsCommunity removes from list L.

By step 2.2, the RRH with equating expections wavelength is made to be subordinated to the BBU that this expectation wavelength is corresponding.

Step 2.3, if list L non-NULL, continues executing with step 2.2, otherwise, is finished, method ends.

Advantages of the present invention with have the active effect that the inventive method reduces presence of intercell interference, improve cell edge Handling capacity and service quality.Alleviate in distributed wireless access network to provide CoMP to access network especially X2 link Form huge pressure and impact, reduce the link stress between BBU, reduce the Business Stream of Inter-BBU CoMP user Amount, thus add the handling capacity of community, improve QoS of customer, be integrally improved the bearing capacity of network.

Accompanying drawing explanation

Fig. 1 is the schematic diagram that the present invention passes through wavelength reconstruct raising CoMP performance;

Fig. 2 is the schematic flow sheet of the wavelength reconstructing method based on topological diagram that the present invention provides;

Fig. 3 is the non-directed graph of description BBU and RRH built in the embodiment of the present invention;

Fig. 4 is that the non-directed graph to Fig. 3 divides subordinate BBU according to minimal cutsThe schematic diagram of RRH;

Fig. 5 is the schematic flow sheet of the wavelength reconstructing method based on wavelength weight that the present invention provides;

Fig. 6 is an embodiment, and (a) is the optimization weight of each community;B () is the row comprising all optimizing cells weights Table.

Detailed description of the invention

Below in conjunction with drawings and Examples, the present invention is described in further detail.

The present invention is found by analysis, in distributed wireless access network, due to BBU separation layout physically, adds On be difficult to BBU and the RRH membership relation that changes.Result in minizone CoMP service and will pay bigger network cost and calculating Cost.And in centralized wireless access network, weaken the fixing membership relation between BBU and RRH, say, that by light net The reconstruct of network can adjust the membership relation of BBU and RRH easily.Substantial amounts of Inter-site CoMP is it would be possible to be converted into Intra-BBU CoMP, this greatly reduces the communication overhead between BBU, reduces the requirement to network capacity and time delay. As it is shown in figure 1, by the reconstruct to wavelength, user U1 is converted into Intra-BBU CoMP from Inter-BBU CoMP.Additionally It should be noted that owing to the reconstruct of wavelength may cause the wavelength of partial interior user to change, such as the user U3 in Fig. 1 Serviced by BBU2 before reconstruct, and serviced by BBU1 after reconstructing.So should both consider when carrying out wavelength reconstruct when Edge customer is also contemplated for internal user simultaneously, and the inventive method purpose is to allow the edge customer service traffics of Inter-BBU CoMP The summation of the internal user service traffics being migrated with wavelength minimizes.In Fig. 1, λ 1, λ 2, λ 3 represent the wavelength of BBU.

The invention provides a kind of wavelength reconstructing method based on topological diagram, improve CoMP performance, flow process such as Fig. 2 institute Show.

Step 1) set up a non-directed graph G=(V, E), BBU and RRH in access network is described.Wherein, if gathering VRRH Represent the set of RRH in access network, be the subset of V, if node therein is RRH1,RRH2,…,RRHk, k is RRH in access network Number;Set VBBURepresent the set of BBU in access network, be also the subset of V, if node therein is BBU1,BBU2,…, BBUp, p is the number of BBU in access network.E is the set on limit, and each edge has a weight.Figure G comprises two kinds of limits, one two Limit between individual RRH, the weight on limit is simultaneously to the user traffic of two RRH request CoMP services.Such as (RRH1, RRH2), on limit, weights are simultaneously to the user traffic of RRH1 and RRH2 request CoMP service.Another kind of limit is RRH and BBU Between limit, the weight on limit represents the internal user service traffics that RRH is being serviced by BBU.Such as: (RRH1,BBU1), this limit Weight represent RRH1By BBU1The service traffics of the internal user of service.

As it is shown on figure 3, in the access network of this example, including two BBU, be numbered BBU1 and BBU2, comprise 7 RRH, mark Number it is RRH1~RRH7.

Step 2) judge that the quantity scheming the BBU node in G, whether less than 2, if so, performs step 4, otherwise sets up virtual opening up Flutter, choose the BBU that business load in BBU is the heaviest, be set to node BBUs, and remaining BBU is merged one dummy node of formation BBUt。

Step 3) use and ask the method for max-flow to try to achieve node BBUsAnd BBUtBetween minimal cut.Drawing according to minimal cut Point may determine that and to be subordinated to BBUsRRH.Then by BBU from figuresAll remove with the RRH being subordinated to it, remove and institute simultaneously The BBU statedsAnd the limit that subordinate RRH node is connected.Then dummy node is split into initial condition.Carry out step 2.

As shown in Figure 4, BBU is determined according to minimal cutsSubordinate RRH node be RRH2, RRH3 and RRH6, by BBUsAnd from The RRH node belonged to removes, and is all removed on the limit being connected with these nodes.

Step 4) only residue 1 BBU and several RRH in network, sets up corresponding membership relation method ends.

By again by the foundation of RRH Yu BBU relation, changing the wavelength of RRH, reduce the link stress between BBU, Reduce the service traffics of Inter-BBU CoMP user.

Present invention also offers a kind of wavelength reconstructing method based on wavelength weight, improve CoMP performance, flow process such as Fig. 5 Shown in.In the method, the optimization weight of each community is first defined.Then one is set up according to the optimization weight of each community Individual list.Then it is optimized according to list.

Implement step as follows:

Step 2.1, if current area is Vi, records wavelength current for Vi and Vi does not applies for total Business Stream of CoMP user Amount;Find and have all community Vj of CoMP relation with Vi, and record each wavelength current for community Vj, and community Vj and Vi it Between apply for CoMP service user traffic.Then by the user traffic recorded in Vi and Vj according to the ripple of community Long be added, by have identical base band user traffic be added.

The wavelength of community refers to the wavelength of the RRH of community.Connected by optical-fiber network between RRH and BBU, be connected to the light of RRH Fibre has a wavelength, and this wavelength is exactly the wavelength of RRH, namely the wavelength of community.The total of CoMP user is not applied in community The internal user service traffics of service traffics i.e. community.

As shown in Figure 6, in figure, cell represents that community, λ 1, λ 2, λ 3 represent the wavelength of community respectively.Such as, the ripple of community 10 A length of 1, internal user service traffics are 8.Around the community of CoMP relation is had to have community 2,3,4,5,6,7 with community 10, these 6 The respective wavelength in community and and community 10 between apply for CoMP service user traffic such as figure in labelling.By these 7 communities According to wavelength, the user traffic recorded is added.For wavelength 1, user traffic is 14;For wavelength 2, user Service traffics are 15;For wavelength 3, user traffic is 10.The user traffic sum of wavelength 2 correspondence is maximum, so Wavelength 2 is expectation wavelength (EW), and 15 these values optimize weight (OW) exactly.

Find out the maximum wavelength of user traffic as community Vi optimization weight (Optimized-weighted: OW);Corresponding wavelength is expectation wavelength (Expect wavelength:EW);And all with expectation wavelength co-wavelength little District Vj is defined as co-wavelength abutting subdistrict (Adjacent cells with same wavelength:ACs).

As shown in Figure 6, the optimization weight of community 10 is 15, it is desirable to wavelength is wavelength 2, wavelength be the community 3 and 4 of 2 be same Wavelength abutting subdistrict.

All of community is traveled through, it is thus achieved that OW, EW and the AC of each community according to said methods

Step 2.2, sets up a list L, such as Fig. 6 according to the optimization weight (OW) of each community order from big to small Shown in (b).Select to optimize the community that weight is maximum, the wavelength of this community is reconstructed into the expectation wavelength (EW) of correspondence, then will This community removes the AC of Bing Jianggai community from listsCommunity also removes from list.

As shown in (b) of Fig. 6, select to optimize the community 3 that weight is maximum, the wavelength of community 3 be reconstructed into wavelength 1, then It is exactly that the RRH of community 3 has been reconfigured on the BBU that wavelength is 1, thus changes the annexation between BBU and RRH.Then The community, co-wavelength abutting subdistrict 1 of community 3 and community 3 correspondence is deleted from table.The RRH with equating expections wavelength is subordinated to The BBU of this expectation wavelength, by this step, reconstructs the membership relation between RRH and BBU.Such as the community 3 of Fig. 6, community 3 is right The RRH answered and the RRH of co-wavelength is subordinated to the BBU that wavelength is λ 1.

Step 2.3, if list L non-NULL, continues executing with step 2.2, otherwise, is finished, method ends.

Claims (3)

1. one kind utilize wavelength reconstruct improve CoMP performance method, it is characterised in that by wavelength reconstruct, adjust BBU and The membership relation of RRH;BBU represents baseband processing unit, and RRH represents remote radio head.
A kind of method utilizing wavelength reconstruct to improve CoMP performance the most according to claim 1, it is characterised in that described Wavelength reconstructs, and uses method based on topological diagram to realize, it is achieved step is as follows:
Step 1, sets up non-directed graph G=(V, E), and wherein, node V comprises the two kinds of nodes of BBU and RRH in access network, and limit E comprises Two kinds, a kind of is the limit between two RRH nodes, and the weight on limit is simultaneously to the customer service of two RRH request CoMP services Flow, another kind is the limit between RRH node and BBU node, and the weight on limit is the internal user industry that RRH is being serviced by BBU Business flow;
Step 2, it is judged that the quantity of the BBU node in figure G, whether less than 2, if so, performs step 4;Otherwise, set up virtual topology, Choose the BBU that business load in BBU is the heaviest, be set to node BBUs, and remaining BBU is merged one dummy node of formation BBUt;
Step 3, uses and asks max-flow method to try to achieve the minimal cut between node BBUs and BBUt, determine according to the division of minimal cut It is subordinated to the RRH of BBUs;From figure, by BBUs be subordinated to its RRH and all remove, remove and BBUs and subordinate simultaneously The limit that RRH node is connected, splits into initial condition by dummy node BBUt;Then step 2 is performed;
Step 4, only remains 1 BBU, remaining RRH and this BBU is set up membership relation, method ends in network.
A kind of method utilizing wavelength reconstruct to improve CoMP performance the most according to claim 1, it is characterised in that described Wavelength reconstructs, and uses method based on wavelength weight to realize, it is achieved step is as follows:
Step 2.1, travels through all of community, according to following method obtain each community optimization weight OW, expectation wavelength EW and Co-wavelength abutting subdistrict ACs;
If current area is Vi, record the service traffics of the internal user of wavelength current for Vi and Vi;Find and have CoMP with Vi All community Vj of relation, record each wavelength current for community Vj, and apply for the use of CoMP service between Vj and Vi of community The service traffics at family;Then the user traffic recording Vi and Vj is added according to the wavelength of community, will have phase With base band user traffic be added;Find out user traffic is maximum after addition wavelength as community Vi's Optimization weight OW, corresponding wavelength is expectation wavelength EW, and community Vj that is all and that expect wavelength co-wavelength is defined as same Wavelength abutting subdistrict ACs;
Step 2.2, sets up a list L according to optimization weight OW of each community order from big to small, selects to optimize weight Maximum community, is reconstructed into the expectation wavelength EW of this community, then by this community and the ACs of this community by the wavelength of this community Community removes from list L;
By step 2.2, the RRH with equating expections wavelength is made to be subordinated to the BBU that this expectation wavelength is corresponding;
Step 2.3, if list L non-NULL, continues executing with step 2.2, otherwise, is finished, method ends.
CN201610602760.9A 2016-07-27 2016-07-27 A method of it is reconstructed using wavelength and improves CoMP performance CN106209181B (en)

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