CN102869101B - A kind of method for managing resource being applicable to mobile-relay system - Google Patents

Abstract

The invention provides a kind of method for managing resource being applicable to mobile-relay system, comprise the following steps: first, MRN and R-UE looks as a whole by DeNB, adopts different tactful Resources allocation by DeNB according to different mobile device type; Secondly, be that R-UE redistributes resource by MRN.Resourse Distribute, interference management and scheduling of resource process combine by the method, to improve resource management flexibility, resource utilization and user fairness.

Description

A kind of method for managing resource being applicable to mobile-relay system

Technical field

The present invention relates to mobile communication technology field, particularly relate to a kind of method for managing resource being applicable to mobile-relay system.

Background technology

Relaying technique is one of key technology of lte-a system.Utilize relaying technique can improve the performance of Cell Edge User, expand the coverage of community.In addition utilize relaying technique can also provide higher message transmission rate for hot zones or degree of depth shadow fading area user, and improve the throughput of whole system to a certain extent.A relay system as shown in Figure 1, mobile device (MobileEquipment in this system, ME) grand user terminal (MacroUE is comprised, M-UE), mobile relay node (MobileRelayNode, MRN), trunk subscriber terminal (Relay-attachedUE, R-UE) and base station (DeNBDonereNodeB.Relaying technique is one of key technology of lte-a system.Utilize relaying technique can improve the performance of Cell Edge User, expand the coverage of community.In addition utilize relaying technique can also provide higher message transmission rate for hot zones or degree of depth shadow fading area user, and improve the throughput of whole system to a certain extent.When disposing relaying, each wireless link (direct connected link (DirectLink), DeNB and via node (RelayNode between DeNB and M-UE, RN) back haul link (BackhaulLink) between and the access link (AccessLink) between RN and R-UE, the Resourse Distribute as shown in Figure 1), interference management and scheduling of resource are the subject matter of resource management in mobile-relay system.If imappropriate reasonably resource management scheme, the unbalanced and interference problem of Resourse Distribute serious between each link will be caused, finally cause the deterioration of systematic function.

In the 3 gpp standards, relaying is divided into band and out-of-band two kinds of patterns.These two kinds of repeater modes mainly pay close attention to the resource allocation problem between relay return link and access link.They utilize Radio Resource respectively by the mode of time division multiplexing (TimeDomainMultiplexing, TDM) and frequency division multiplexing (FrequencyDomainMultiplexing, FDM).In band, repeater mode only need utilize single carrier wave, therefore becomes 3GPPLTE research emphasis.The introduction of carrier aggregation technology enables more frequency spectrum resource obtain flexible allocation, improves the feasibility of the outer repeater mode application of band, because it has more multicarrier to use for back haul link and access link.But 3GPP tissue does not propose detailed resource management scheme for these two kinds of repeater mode application under carrier aggregation scene at present.

Carrier aggregation technology is another key technology of lte-a system, and it is intended to the band spreading demand meeting the proposition of radio communication department of International Telecommunication Union.Two or more member carrier (ComponentCarrier, CC) can be aggregated into a wider usable spectrum by carrier aggregation technology, and maximum transmission bandwidth can reach 100MHz, makes up-downgoing peak rate reach 500Mbps and 1Gbps respectively.Carrier aggregation technology has certain flexibility, can be polymerized the continuous or discontinuous member carrier of single frequency band or different frequency range.For keep backwards compatibility, each member carrier should with LTERel.8 operating such.

The subject matter that in band, relaying and the outer repeater mode of band exist at present is that Resourse Distribute is dumb, both the fairness of Resourse Distribute between M-UE and R-UE cannot have been ensured, also the resources balance between relay return link and access link cannot be ensured, therefore, very easily the injustice of Resourse Distribute and the bottleneck effect of relay return link between different UEs is produced.For the inflexible problem of band and out-of-band repeater mode Resourse Distribute, current existence two kinds of resource management schemes be applicable to interior relaying---Resource Unit justice (Fair-Resource-Unit, and the resource allocation methods of throughput fairness (Fair-Throughput, Fair-TP) Fair-RU).The modified model of this two schemes can also be applied to the outer repeater mode of band.But two spike-type cultivars allocative decision only considers the fairness problem of Resourse Distribute between M-UE and R-UE, but do not consider the resources balance between relay return link and access link, very easily cause wherein certain link to produce bottleneck effect because of inadequate resource.

MRN, as the special relaying of one, not only has the feature of traditional base station formula fixed relay, also supports group's mobility and disposes flexibility.It is mainly arranged on the higher vehicles of user density (long-distance bus, train, passenger steamer etc.), to provide high-quality communication service for passenger, as shown in Figure 1.Due to MRN position changeable, there is some new problems compared with fixed relay.Such as its back haul link channel is because becoming when the change of MRN position is, and access link geo-stationary.So need the situation of change considering surrounding environment more when designing the resource management scheme of MRN, and be designed to a dynamic process.In addition, because fixed relay is generally arranged on cell edge, traditional resource management scheme carries out channeling usually between direct connected link and access link, do not consider the interference problem between two kinds of links, but in MRN situation, this interference is likely quite serious, must take in.

Summary of the invention

The object of the present invention is to provide a kind of method for managing resource being applicable to mobile-relay system, Resourse Distribute, interference management and scheduling of resource process are combined, to improve resource management flexibility, resource utilization and user fairness.

In order to reach above object, the embodiment of the present invention discloses a kind of method for managing resource being applicable to mobile-relay system, comprises the following steps:

First, MRN and R-UE looks as a whole by DeNB, adopts different tactful Resources allocation by DeNB according to different mobile device type;

Secondly, be that R-UE redistributes resource by MRN.

Further, preferred as one, relay system is single-carrier system.

Further, preferred as one, relay system is multicarrier system.

Further, preferred as one, multicarrier system comprises further distributes to each mobile entity by all member carriers.

Further, preferred as one, mobile entity is M-UE, MRN and/or R-UE.

Further, preferred as one, adopt different tactful Resources allocation first to comprise by DeNB according to different mobile device type: to calculate equitable proportion module.

Further, preferred as one, different tactful Resources allocation is adopted to comprise further by DeNB according to different mobile device type: DeNB is that M-UE and MRN distributes RU according to equitable proportion module, then access link is reentried RU, the RU distributing to access link is that in all UE, quality is the poorest, once RU is assigned with give access link, it just can not be assigned to M-UE or MRN again.

Further, preferred as one, if RU distributes to access link, just start to enter the redistribute resources process by MRN control R-UE, the RU distributing to access link reallocates to corresponding R-UE according to traditional proportional fair algorithm or polling algorithm by MRN, and estimates the throughput of access link, if the throughput of access link is lower than the throughput of back haul link, just again distribute the RU that in residue RU, quality is the poorest to access link, until access link and back haul link throughput reach balance.

Resource Distribution and Schedule process combines by the present invention, not only implements simply, flexible, user fairness is good, also improve flexibility and the resource utilization of resource management, make all mobile entities in network reach the optimization of Resourse Distribute.

Accompanying drawing explanation

When considered in conjunction with the accompanying drawings, by referring to detailed description below, more completely can understand the present invention better and easily learn wherein many adjoint advantages, but accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention, wherein:

Fig. 1 is embodiment of the present invention mobile relay deployment scenario schematic diagram.

Fig. 2 is embodiment of the present invention TLPF(two-stage equitable proportion) CC(member carrier) distribute schematic diagram.

Fig. 3 is the detail flowchart of TLPF scheme.

Embodiment

For enabling above-mentioned purpose, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.

As shown in Figure 1, the embodiment of the present invention proposes a kind of two-stage equitable proportion (Two-LevelProportionalFair, TLPF) resource management scheme being applicable to mobile-relay system.Mobile device (MobileEquipment in this system, ME) grand user terminal 4(MacroUE is comprised, M-UE), mobile relay node 3(MobileRelayNode, MRN), trunk subscriber terminal 1(Relay-attachedUE, R-UE) and relaying 2(DeNBDonereNodeB).In this programme, relay station 2(DeNBDonereNodeB) regard MRN3 and R-UE4 as an entirety, like this from DeNB2 angle, whole network is not the double jump framework of a traditional relay system, but the single-hop framework model of a flattening.

The present invention proposes a kind of resource management scheme being applicable to the lte-a system of mobile relay, i.e. two-stage equitable proportion scheme.In the first order, MRN3 and R-UE4 looks as a whole by DeNB2, therefore whole network is no longer the double jump framework of traditional relay system, but the single-hop framework model of a flattening, adopt different tactful Resources allocation by DeNB2 according to different mobile device type.In the second level, be that R-UE4 redistributes resource by MRN3.Resource Distribution and Schedule process combines by this programme, not only implements simply, flexible, user fairness is good, also improve flexibility and the resource utilization of resource management, make all mobile entities in network reach the optimization of Resourse Distribute.

In conventional proportional justice (ProportionalFair, PF) algorithm, eachly treat that dispatched users can be endowed a priority, first the user that priority is the highest transmits.At each scheduling instance t, the prerequisite that Resource Unit (ResourceUnit, RU) distributes to user i is that i meets:

$i=\arg \underset{i\∈U}{\max }\left\{\frac{R_i(l,m,t)}{T_i\left(t\right)}\right\},$ 1≤l≤C;(1)

Wherein U represents total number of users, and C represents CC sum.R _i(l, m, t) represents the momentary rate of user i t on m the RU of l CC.T _it () represents the Mean Speed of user i before moment t, account form is:

$T_i\left(t\right)=(1-\frac{1}{t_c})T_i(t-1)+\frac{1}{t_c}\mathrm{\δ}---\left(2\right)$

Wherein t _crepresent average window size, δ represents that user i is in (t-1) moment momentary rate, and its account form is as follows:

Wherein r _irepresent the momentary rate of user i at certain RU, if this RU is not yet assigned to user i, then this value is 0.

TLPF scheme is the improvement based on conventional proportional fair algorithm, and namely the program can be used for single-carrier system, also can be used for multicarrier system.In multi-carrier systems, a basic assumption is that all member carriers (ComponentCarrier, CC) are all distributed to each mobile entity, comprises M-UE, MRN and R-UE.The allocative decision of a kind of pair of carrier wave as shown in Figure 2.Because consider from load balancing angle, we wish that all loads of system can be evenly distributed on each CC.When the MRN3 adhering to multiple R-UE4 initiates to switch, if distribute a CC only to this MRN3, this CC load can be very heavy, and for reaching load balancing between different CC, some M-UE1 need to be switched on other CC.If all CC are distributed to MRN3, between CC, load balancing process will complete in MRN3 inside, and the intercarrier of M-UE4 can not be caused to switch.Therefore, this allocative decision not only makes Consumer's Experience and dispatching flexibility improve, and reduces the signaling consumption of intercarrier switching, avoids declining because intercarrier switches the communication quality caused.

As can see from Figure 2, in system, every bar link is all operated on all carrier waves.

Resource allocation process is controlled by DeNB2 in the scheme first order.MRN3 and R-UE4 is regarded as an entirety by DeNB2, and therefore whole network is no longer the double jump framework of traditional relay system, but the single-hop framework model of a flattening.With traditional PF class of algorithms seemingly, DeNB2 needs to be grasped the channel quality information of M-UE4 and MRN3, and the channel quality information of R-UE1 only needs to report MRN2, DeNB3 without the need to grasp.

Fig. 3 is the detail flowchart of TLPF scheme.

S1, distribute all CC for each mobile entity.

S2, mobile entity are classified.

S3, acquisition channel quality information.

S4, first calculating PF module, the PF module of different mobile entity is different, the module of M-UE can calculate according to formula (1), the module of MRN is the product of conventional PF module and R-UE quantity, as shown in Equation (4), because DeNB regards MRN and R-UE as an entirety, therefore need not calculate the PF module of R-UE, DeNB is only that the UE be made up of MRN and M-UE gathers all UE scheduling resources in Φ.

$i=\arg \underset{i\∈U_R}{\max }\{\frac{R_i(l,m,t)}{T_i\left(t\right)}\·N_R\},$ 1≤l≤C;(4)

Wherein U _rrepresent MRN number.

Identical Resourse Distribute can obtain larger throughput to M-UE, therefore considers resource utilization, can add a coefficient in formula (4), regulates the Resourse Distribute ratio between M-UE and MRN, as formula (5)

$i=\arg \underset{i\∈U_R}{\max }\{\frac{R_i(l,m,t)}{T_i\left(t\right)}\·N_R\·\mathrm{\δ}\},$ 1≤l≤C,0≤δ≤1;(5)

S5, then, DeNB are that M-UE and MRN distributes RU according to PF module.S6, to judge whether MRN dispatches complete, if do not had, then enters next RU and distribute, if so, then enter S7.S7, after MRN is assigned to some RU, access link also should obtain RU.In order to obtain the highest throughput, the RU distributing to access link should be the poorest relative to UE quality all in Φ, S8, in order to eliminate the interference between access link and other links, once RU is assigned with give access link, it just can not be assigned to M-UE or MRN again, therefore should concentrate from RU to be scheduled and delete.The poorest RU of quality meets formula (6).

$m=\arg \underset{m\∈M_l}{\min }\underset{i\∈U\∪U_R}{\mathrm{mean}}\left\{R_i(l,m,t)\right\},$ 1≤l≤C;(6)

Wherein M _lrepresent the RU sum on CCl.

Once there be RU to distribute to access link, just start the second level scheduling process in TLPF scheme.S9, in the second level by the redistribute resources process of MRN control R-UE, the RU distributing to access link reallocates to corresponding R-UE according to traditional PF algorithm by MRN, S10 also estimates the throughput of access link, if the throughput of access link is lower than the throughput of back haul link, just need again to distribute RU that in residue RU, quality is the poorest to access link, until access link and back haul link throughput reach balance.

S11, repeat above step, until all RU are assigned.

Be line-of-sight transmission between usual MRN and R-UE, the channel quality of access link is also metastable.In order to avoid the signaling consumption that transmission of channel quality information continually causes, for access link, other are not also feasible containing scheduling strategies of channel quality information, as polling dispatching algorithm (RoundRobin, RR).

Although the foregoing describe the specific embodiment of the present invention, but those skilled in the art is to be understood that, these embodiments only illustrate, those skilled in the art, when not departing from principle of the present invention and essence, can carry out various omission, replacement and change to the details of said method and system.Such as, merge said method step, thus then belong to scope of the present invention according to the function that the method that essence is identical performs essence identical to realize the identical result of essence.Therefore, scope of the present invention is only defined by the appended claims.

Claims (3)

1. one kind is applicable to the method for managing resource of mobile-relay system, this system comprises grand user terminal M-UE (MacroUE, M-UE), mobile relay node MRN (MobileRelayNode, MRN), trunk subscriber terminal R-UE (Relay-attachedUE, and relaying DeNB (DonereNodeB R-UE), DeNB), it is characterized in that, comprise the following steps:

The first step, for each mobile entity distributes all member carriers;

Second step, mobile relay node and trunk subscriber terminal are looked as a whole by relaying, and the channel quality information of grand user terminal and mobile relay node grasped by relaying, and mobile relay node grasps the channel quality information of trunk subscriber terminal;

3rd step, calculates PF module,

The module of grand user terminal is calculated as follows:

$i=\arg \underset{i\∈U}{\max }\left\{\frac{R_i(l,m,t)}{T_i\left(t\right)}\right\},1\≤l\≤C;$

Wherein U represents total number of users, and C represents member's total number subcarriers, R _i(l, m, t) represents the momentary rate of user i t on m RU of l member carrier,

T _it () represents the Mean Speed of user i before moment t, account form is: wherein t _crepresent average window size,

δ represents that user i is in (t-1) moment momentary rate, and account form is:

Wherein r _irepresent the momentary rate of user i at certain RU, if this RU is not yet assigned to user i, then this r _ivalue is 0,

The module of mobile relay node is the product of conventional PF module and trunk subscriber terminal quantity, is calculated as follows: $i=\arg \underset{i\∈U_R}{\max }\left\{\frac{R_i(l,m,t)}{T_i\left(t\right)}\·N_R\right\},1\≤l\≤C;$

Wherein U _rrepresent mobile relay node number,

The module of relaying is all scheduling of user terminals resources in the set of user terminals Φ be made up of mobile relay node and grand user terminal;

4th step, relaying is that grand user terminal and mobile relay node distribute RU according to PF module, then access link is reentried RU, the RU distributing to access link is that in all user terminals, quality is the poorest, once RU is assigned with give access link, it just can not be assigned to grand user terminal or mobile relay node again, and should concentrate from RU to be scheduled and delete, the poorest RU of quality meets formula:

$m=\arg \underset{m\∈M_l}{\min }\underset{i\∈U\∪U_R}{mean}\left\{R_i(l,m,t)\right\},1\≤l\≤C;$

Wherein M _lrepresent the RU sum on l member carrier;

5th step, if RU distributes to access link, just start to enter the redistribute resources process being controlled trunk subscriber terminal by mobile relay node, the RU distributing to access link reallocates to corresponding trunk subscriber terminal according to traditional proportional fair algorithm or polling algorithm by mobile relay node, and estimate the throughput of access link, if the throughput of access link is lower than the throughput of back haul link, just again distribute the RU that in residue RU, quality is the poorest to access link, until access link and back haul link throughput reach balance.

2. the method for managing resource being applicable to mobile-relay system according to claim 1, is characterized in that, described relay system is single-carrier system.

3. the method for managing resource being applicable to mobile-relay system according to claim 1, is characterized in that, described relay system is multicarrier system.