CN103687033A - LTE MU-MIMO system resource distributing method and device - Google Patents
LTE MU-MIMO system resource distributing method and device Download PDFInfo
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Abstract
The invention discloses an LTE MU-MIMO system resource distributing method. The method comprises the steps of calculating the service quality metric of N pieces of UE of resources to be distributed, wherein the service quality metric is used for indicating the service quality demand information of the UE; selecting M pieces of UE, largest in service quality metric, of the resources to be distributed according to the magnitude of the service quality metric to form a pairing object set, wherein M is smaller than N; conducting pairing treatment on the UE of resources, to be distributed, and centralized in pairing objects; and distributing the same time frequency resources to the paired UE. The invention further discloses an LTE MU-MIMO system resource distributing device. The method and device enable relevant service really needing resources to obtain resources timely.
Description
Technical field
The application relates to mobile communication technology field, particularly a kind of resource allocation methods and device of LTE MU-MIMO system.
Background technology
MIMO(Multiple-Input Multiple Output, multiple-input and multiple-output) technology, owing to having the power system capacity of significantly improving and the availability of frequency spectrum, is widely used among various communication systems.3GPP LTE project is at the beginning just using it as one of essential key technology.For LTE system, user terminal small volume, for avoiding crosstalking between signal, conventionally many antennas can not be installed, in actual application, develop the MU-MIMO technology based on LTE system, be virtual MIMO technology (multiuser MIMO technology, Muti-User MIMO).Referring to Fig. 1, the figure shows the scene signal of the MU-MIMO technology of 2 * 2, by this technology, can allow user terminal 1, user terminal 2 or more users terminal to take identical running time-frequency resource, and then utilize this running time-frequency resource to carry out resource distribution, which has effectively improved spatial reuse gain, has saved frequency spectrum resource.
In LTE MU-MIMO system, adopt which kind of mode to carry out multiple users to the share of identical running time-frequency resource, i.e. it is the crucial part of this technology that resource on pairing between user terminal and pairing basis is distributed.Prior art is conventionally using the quality of channel quality as the decision condition of selecting user terminal pairing, according to the channel quality condition of different user terminals, select pairing object and resource allocation mode separately, this multiple users has realized to the mode of share of identical running time-frequency resource the object that improves power system capacity and the availability of frequency spectrum in LTE system preferably.But in the situation that system resource is limited, this Resources allocation mode can not guarantee really to need to utilize the related service of resource can obtain in time resource.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of resource allocation methods and device of LTE MU-MIMO system, to guarantee really to need to utilize the related service of resource can obtain in time resource, thereby realizes regular traffic.
The resource allocation methods of the LTE MU-MIMO system that the embodiment of the present application provides comprises:
Calculate the quality of service metric of N UE of resource to be allocated, described quality of service metric is used to indicate the quality of service requirements information of UE;
The UE that chooses M resource to be allocated of quality of service metric maximum according to described quality of service metric size forms pairing object set, and described M is less than N;
The UE of the resource to be allocated in described pairing object set is matched to processing;
To the UE having matched, distribute identical running time-frequency resource.
Preferably, the service priority that described quality of service metric is carried by UE, etc. the urgency of data volume waiting for transmission and/or transfer of data determine.
Preferably, set the preliminary election cycle, the UE that carries out the quality of service metric of N the UE that calculates resource to be allocated and choose M resource to be allocated of quality of service metric maximum within the preliminary election cycle forms and matches the number of times of step of object set and be less than the quotient of described preliminary election cycle and resource allocation cycle.
Preferably, the described UE to the resource to be allocated in described pairing object set matches to process and specifically comprises;
According to the forming coefficient of the UE of each resource to be allocated in pairing object set, estimate the azimuth of the UE of each resource to be allocated; The UE that azimuthal difference is greater than to the resource to be allocated of default correlation threshold value matches processing; And/or,
Calculate average transmission rate and/or the actual transmissions spectrum efficiency of the UE of each resource to be allocated in pairing object set, the UE that the difference that the difference of average transmission rate is less than to default transmission rate threshold value and/or actual transmissions spectrum efficiency is less than the resource to be allocated of default spectrum efficiency threshold value matches processing.
Preferably, the described UE to having matched distributes identical running time-frequency resource specifically to comprise:
The scheduling metric that calculates the UE having matched, described scheduling metric is used to indicate the order that the UE for having matched carries out resource distribution;
According to the size of described scheduling metric, the UE having matched is distributed to identical running time-frequency resource.
Further preferably, the scheduling metric of the UE that described calculating has been matched specifically calculates according to the following equation:
In formula: W
qosfor the quality of service metric of UE, W
sINRfor UE channel quality status parameter, R
ave(t) be UE average accumulated transmission rate, W
sche(ue) for having matched the scheduling metric of UE.
Preferably, before the UE of the resource to be allocated in described pairing object set matches processing, described method also comprises:
Calculate the Signal to Interference plus Noise Ratio of the UE of each resource to be allocated in described pairing object set;
The UE that Signal to Interference plus Noise Ratio is greater than to default Signal to Interference plus Noise Ratio threshold value is as matching the UE of the resource to be allocated in object set.
The embodiment of the present application also provides a kind of resource allocation device of LTE MU-MIMO system.This device comprises: quality of service metric computing unit, pairing object select unit, pairing processing unit and resource allocation unit, wherein:
Described quality of service metric computing unit, for calculating the quality of service metric of N UE of resource to be allocated, described quality of service metric is used to indicate the quality of service requirements information of UE;
Described pairing object select unit, forms pairing object set for choose the UE of M resource to be allocated of quality of service metric maximum according to described quality of service metric size, and described M is less than N;
Described pairing processing unit, for matching processing to the UE of the resource to be allocated of described pairing object set;
Described resource allocation unit, distributes identical running time-frequency resource for the UE to pairing.
Preferably, described device also comprises timing unit and carries out number of times control unit, described timing unit is used for setting the preliminary election cycle, described execution number of times control unit, carries out the quality of service metric of N the UE that calculates resource to be allocated and UE that M resource to be allocated choosing quality of service metric maximum carried out in pairing object select unit and forms and match the number of times of step of object set and be less than the quotient of described preliminary election cycle and resource allocation cycle for being controlled at quality of service metric computing unit in the preliminary election cycle.
Preferably, described pairing processing unit specifically comprises azimuth estimation subelement and the first pairing processing subelement, and/or subelement is processed in speed/efficiency calculation subelement and the second pairing, wherein:
Described azimuth estimation subelement, for estimating the azimuth of the UE of each resource to be allocated according to the forming coefficient of the UE of each resource to be allocated of pairing object set;
Subelement is processed in described the first pairing, for azimuthal difference being greater than to the UE of the resource to be allocated of default correlation threshold value, matches processing;
Described speed/efficiency calculation subelement, for calculating average transmission rate and/or the actual transmissions spectrum efficiency of UE of each resource to be allocated of pairing object set;
Subelement is processed in described the second pairing, and the UE that is less than the resource to be allocated of default spectrum efficiency threshold value for the difference of average transmission rate being less than to the difference of default transmission rate threshold value and/or actual transmissions spectrum efficiency matches processing.
Preferably, described resource allocation unit specifically comprises: scheduling metric computation subunit and resource are distributed subelement, wherein:
Described scheduling metric computation subunit, for calculating the scheduling metric of the UE having matched, described scheduling metric is used to indicate the order that the UE for having matched carries out resource distribution;
Described resource is distributed subelement, for the UE having matched being distributed to identical running time-frequency resource according to the size of described scheduling metric.
The embodiment of the present application is in UE time-frequency resource allocating process, not only consider channel quality, and what is more important by the quality of service of UE, the form with quality of service metric takes into account, using it as a condition that enters pairing object set, this impact that different user terminals UE own service demand is distributed resource is rationally reflected, and then resource-constrained in the situation that, can preferably guarantee to truly have the related service that utilizes resource to need to obtain in time resource, complete regular traffic.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, the accompanying drawing the following describes is only some embodiment that record in the application, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the scene schematic diagram of MU-MIMO technology;
Fig. 2 is the resource allocation methods embodiment flow chart of the application's LTE MU-MIMO system;
Fig. 3 is the resource allocation device embodiment composition frame chart of the application's LTE MU-MIMO system.
Embodiment
In order to make those skilled in the art person understand better the technical scheme in the application, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Embodiment based in the application, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all should belong to the scope of the application's protection.
Referring to Fig. 2, the figure shows the flow process of an embodiment of resource allocation methods of the application's LTE MU-MIMO system.This flow process comprises:
Step S201: calculate the quality of service metric of N UE of resource to be allocated, described quality of service metric is used to indicate the quality of service requirements information of UE;
In LTE system, resource shares out the work and conventionally by base station (eNodeB), is completed.A base station may face to one or more UE(user terminals within a period) carry out resource distribution, these resources of wishing to obtain base station assigns be take and realized the UE that the UE of its business is resource to be allocated.The present embodiment calculates quality of service (Quanlity of Service, the QoS) metric of N UE of resource to be allocated, to utilize this quality of service metric to carry out subsequent operation.QoS metric can reflect the QoS demand of UE, by the size of QoS metric, can indicate the quality of service requirements information of UE.The factor of reflection QoS metric size can comprise the urgency of the data volumes waiting for transmission such as UE bearer service priority, carrying, transfer of data etc.These factors can be used as factor arranged side by side to be considered on same level, and the factor of progressive relationship before and after having that also can be used as is considered successively, these factors can also be considered separately respectively in different embodiment.The mode of front and back progressive relationship of take considers that above-mentioned factor is as example, first, can distinguish different service priority, type of service different business priority is conventionally different, such as, for VoIP/GBR, non-GBR tri-class business, the priority of VoIP business is the highest conventionally, GBR business is taken second place, and non-GBR service priority is minimum; Secondly, in the situation that service priority is identical, further consider traffic demand and the time urgency of transfer of data, for example, user terminal UE1 and user terminal UE2, both all carry non-GBR business, but the download demand of the non-GBR1 of UE1 carrying is 100Kbit/s, the download demand of the non-GBR2 of UE2 carrying is 200Kbit/s, at this moment, because the transfer of data demand of non-GBR2 is large, in resource allocation process, can be preferably its allocation of transmission resources.The aforementioned different factors to reflection quality of service metric size, consider in a different manner to have influence on the specific formula for calculation of quality of service metric, such as, a kind of simple consideration mode is directly a plurality of factors to be carried out being directly added after certain processing, and quality of service metric can calculate according to following formula:
W
qoS=e
traffic demand parameter+ e
the urgent parameter of time delay+ e
(9-QCI priority)
In above formula: traffic demand parameter refers to the total amount of bits of packet in buffering area of data that UE need to send and the ratio of service traffics demand, and this ratio is larger, illustrates that the packet not sending of this UE accumulation is more, and QoS priority is higher; The urgent parameter of time delay refers to the time that data that UE need to send have been waited in buffering area, and with the ratio of the maximum delay time of this business need, this ratio is larger, illustrates that the time delay urgency of UE is higher, and QoS priority is higher; QCI represents QoS class indication, and it is not higher that span is generally the less expression service priority of 1～9, QCI.
Step S202: the UE that chooses M resource to be allocated of quality of service metric maximum according to described quality of service metric size forms pairing object set, and described M is less than N;
By abovementioned steps, determine after quality of service metric, can to the UE of each resource to be allocated, sort according to the size of quality of service metric, and therefrom choose the UE of M the resource to be allocated of quality of service metric maximum, the Constitution Elements using them as pairing object set.In actual application, here should be noted that 3 points: the one, in some cases, calculate after quality of service metric, during the UE of the M of selectance value maximum resource to be allocated, can not sort, and directly carry out between two determining more afterwards M maximum UE, that is to say, sequence is only the alternative step that convenient selection is carried out.The 2nd, carrying out M UE while choosing, the present embodiment requires the value of M to be less than N, the UE preselected operation that utilizes quality of service metric to carry out is here contractility preliminary election, the UE that can get rid of those quality of service metrics less (show its business demand not so strong) by this preliminary election mode enters into limited resource allocation process, thereby guarantees nervous resource to be applied to meet those on the UE in the urgent need to resource.The 3rd, the concrete value of M can determine according to actual conditions here, as long as carry out immediately the quantity that the quantity of the UE of resource distribution is less than the UE that has resource distribution requirements in this resource is distributed.Generally, M can consider to determine after the calculation process ability of base station.The 4th, the present embodiment for pairing object set formation a kind of measurement mode that quantizes is easily provided, this mode neither " is received all " to carrying out the UE of resource distribution, also the UE of nonvoluntary selection some carries out resource distribution, the concrete condition of the UE business demand of having distinguished resource to be allocated of " not receiving all ", such as the service priority carrying according to UE, present flow rate demand, the factors such as business urgency are treated respectively UE, nonvoluntary selection is less than the individual UE of N and is that the application is not merely to reduce the quantity of the resource allocation request of processing base station, and be how more reasonably to distribute extremely limited resource.
Step S203: the UE of the resource to be allocated in described pairing object set is matched to processing;
Determine after pairing object set, generally can match to the UE in this set processings, the concrete mode of processing of matching can be matched the mode of its pairing according to any, needs only the realization of the goal of the invention that does not hinder the application.Here " pairing " can not only be interpreted as and be limited between two UE, in this application, the incidence relation between a kind of different UEs has been expressed in pairing, a UE can form pairing with other one or more UE, that is to say, a UE can have and the UE set UEi={UEj self matching, j ≠ i}.In actual application, if formed and a pairing set that UE is corresponding, in the situation that the disposal ability of base station allows, can consider the replication problem in different pairing set, when the disposal ability in base station can not meet the demands, can be when a UE have entered into pairing set corresponding to certain UE, no longer consider the pairing of itself and other UE.
Step S204: distribute identical running time-frequency resource to the UE having matched.
For determined the UE of pair relationhip by abovementioned steps, can be for these UE distribute identical running time-frequency resource, these UE share running time-frequency resource.In actual application, except directly carrying out time-frequency resource allocating resource to the UE having matched, can also first to these UE, carry out investigation to a certain degree, see whether it is applicable to adopting MU-MIMO mode to carry out resource distribution, because may and being not suitable for adopting MU-MIMO mode, some UE need to adopt SU-MIMO, such as, for the UE in cell edge, these UE generally its channel quality are poor, if this part UE is also paired, the channel quality inter-user interference that other UE can be larger to its generation preferably with its pairing, this will reduce the transmission rate of edge customer, have influence on transmission quality.For this reason, in order to guarantee the transmission quality of the user terminal that these channel conditions are poor, conventionally adopt SU-MIMOD(Single-User MIMO, Single User MIMO) transmission means.Before carrying out resource allocation operations, the application is preferably not suitable for these adopting the UE of MU-MIMO to get rid of outside resource is distributed, specific implementation can be processed in accordance with the following steps: first calculate the Signal to Interference plus Noise Ratio SINR of the UE of each resource to be allocated in described pairing object set, then by this Signal to Interference plus Noise Ratio and default Signal to Interference plus Noise Ratio threshold value SINR
targetcompare, the UE of the resource to be allocated in pairing object set using the UE that is greater than default Signal to Interference plus Noise Ratio threshold value only, if i.e. SINR<SINR
target, this UE belongs to low SINR user, does not carry out virtual MIMO pairing transmission, and directly adopts SU-MIMO transmission means, to avoid the interference between multi-user, ensures the transmission quality of channel quality poor user; If SINR>=SINR
target, carry out subsequent treatment.Here it should be noted that the above-mentioned judgement of carrying out transmission means can carry out before processing carrying out UE pairing, can avoid like this those not adopt the UE of MU-MIMO transmission means to carry out the waste that matching operation brings calculation process resource.
The present embodiment is in UE time-frequency resource allocating process, not only consider channel quality, and what is more important by the quality of service of UE, the form with quality of service metric takes into account, using it as a condition that enters pairing object set, this impact that different user terminals UE own service demand is distributed resource is rationally reflected, and then resource-constrained in the situation that, can preferably guarantee to truly have the related service that utilizes resource to need to obtain in time resource, complete regular traffic.
Above-described embodiment is the basic implementation of the present application object, in actual application, can carry out some to it improve based on various concrete conditions, forms new embodiment, to obtain other or better technique effect.Below exemplary provide several improved procedures, those skilled in the art, on these example improvement mode bases, can obtain more mode of texturing.
One of improved procedure: the execution number of times to the selecting step of the calculation procedure of quality of service metric and UE to be allocated in certain time length limits.
It is conventionally very frequent that the operation of resource distribution is carried out in base station, within a shorter time, may carry out repeatedly resource allocation operations, and often carry out first resource batch operation according to the mode of previous embodiment, all need the UE that carries out the quality of service metric step of N the UE that calculates resource to be allocated and choose M resource to be allocated to form the step of matching object set.Yet, in actual application, in adjacent several resource allocation cycle, the quality of service metric of each UE changes also little, that is to say, even if the quality of service metric that again carries out quality of service metric calculation procedure and foundation calculating is chosen the step of UE, its results change is little, and the element in the pairing object set obtaining may be similar, carries out so aforementioned two steps very not large meaning except waste calculation resources.For this reason, the improved mode of the application is to limit aforementioned two steps execution number of times within a certain period of time.Particularly: first set a preliminary election cycle, within this preliminary election cycle, according to the mode of previous embodiment, may need to carry out repeatedly abovementioned steps, then control the quotient that number of times that aforementioned two steps carry out within the preliminary election cycle is less than preliminary election cycle and resource allocation cycle, that is to say, within the cycle in advance, originally often carry out the operation that first resource batch operation all needs the computing service quality metric value of carrying out and chooses UE, limit the quotient of only carrying out once or be less than preliminary election cycle and resource allocation cycle, a rear resource allocation cycle need to carry out UE pairing and concrete resource is divided timing, the identical pairing object set that adopts once the UE step by computing service quality metric value and M resource to be allocated choosing according to quality of service metric to form.In specific implementation process, can consider to introduce UE timer, the preliminary election cycle triggers UE and carries out aforesaid preselected operation (generating run of pairing object set) while starting, timer initial value is set, such as the preliminary election cycle is i.e. 1000 TTI of 1s, timer initial value is made as 1000, this timer value of TTI of every mistake subtracts 1, and timer value is to represent this preliminary election end cycle at 0 o'clock, empties aforementioned pairing object set, trigger UE preselected operation, repeat the process in a preliminary election cycle.
Two of improved procedure: the pairing that realizes UE by consideration channel relevancy, spectrum efficiency and resource requirement situation is processed.
As previously mentioned, the application can select any mode that can realize UE pairing to carry out UE pairing processing.But, in order to choose pairing UE out, be the UE that needs most resource really, the application can consider that based on channel relevancy, spectrum efficiency and resource requirement situation etc., realizing pairing processes.Particularly: when considering channel relevancy, can judge whether the pair relationhip between the necessary UE of foundation according to the deflection of UE to be paired.Between two UE that can match, conventionally require to have less channel relevancy, two could be transmitted and separate like this, deflection can be for weighing the correlation size between different UEs.The application first estimates the azimuth (DoA) of the UE of each resource to be allocated according to the forming coefficient of the UE of each resource to be allocated in pairing object set; The difference of azimuth (DoA) is greater than to default correlation threshold value Δ DoA
targetthe UE of resource to be allocated match processing, calculate respectively the azimuth DoA of j UEj in i UEi and pairing object set, then ask for this two azimuthal difference DELTA
i,j=| DoA
uEi-DoA
uEj|, the difference of asking for and predetermined threshold value are compared, as long as Δ
i,j> Δ DoA
target, illustrate that this two UE pairing can not cause disturbing, finally determine to be { UEj| Δ with the UE set of the pairing of i UEi
i,j> Δ DoA
target.When considering spectrum efficiency, can judge whether the pair relationhip between the necessary UE of foundation according to the spectrum efficiency of UE to be paired.Particularly: first calculate the actual transmissions spectrum efficiency of the UE of each resource to be allocated in pairing object set, the UE that the difference of actual transmissions spectrum efficiency is less than to the resource to be allocated of default spectrum efficiency threshold value matches processing.When considering resource requirement situation, can determine to join the whether necessary pair relationhip between UE of setting up according to the average transmission rate of reflection resource requirement situation.Its implementation and spectrum efficiency are similar, calculate the average transmission rate of the UE of each resource to be allocated in pairing object set that is:, and the UE that the difference of average transmission rate is less than to the resource to be allocated of default transmission rate threshold value matches processing.It should be noted that, above-mentioned three factors are introduced respectively, in actual application, can be by any two considerations in the lump that combine in three, certainly, reasonable mode is that three considers simultaneously, and the condition that meets pair relationhip not only requires the difference of UE deflection to be greater than default correlation threshold value, and, require the average transmission rate of UE and the corresponding difference of actual transmissions spectrum efficiency to be less than corresponding predetermined threshold value.This matching method of simultaneously considering channel relevancy, spectrum efficiency and resource requirement situation, has taken into full account the business demand of different user, can effectively suppress the interference between multi-user, improves the availability of frequency spectrum.
Three of improved procedure: the mode of dispatching metric by calculating realizes matches the resource of UE and distribute.
As previously mentioned, after the pair relationhip determining between the UE of resource to be allocated, can directly carry out resource allocation operations.But in actual application, the UE that can also match to these carries out a minor sort, therefrom select the most forward pairing UE to carry out resource distribution, this mode can be assigned to the most critical resource on the UE that needs most resource.During specific implementation, the UE sequence that the application adopts the mode of calculating scheduling metric to match, then one or more pairs of UE of selection scheduling metric maximum carry out resource distribution.The resource allocation order of the scheduling metric reflection pairing UE here.While calculating this value, can consider the average accumulated transmission rate of quality of service metric, channel quality status and the UE of UE.Quality of service metric can show user's priority and the impact of business demand urgency on scheduling metric, and the priority of UE is higher, and business demand is more urgent, and its scheduling metric is larger; Channel quality status can show the impact of channel quality on scheduling metric, in the situation that other conditions are identical, be preferably the UE that channel quality is good and carry out resource distribution, can as far as possible effectively utilize system bandwidth, the availability of frequency spectrum of elevator system like this; Average accumulated transmission rate can show the impact of transmission rate on scheduling metric, this factor can guarantee the fairness of serving between different UEs in community to a certain extent, be that its average cumulative transmission rate is larger, show that the subdistrict frequency band resource taking in a period of time is in the past more, consider the fairness between UE, therefore after TTI to reduce the chance of its scheduling while dispatching, more local resource is distributed to the UE that does not enjoy service.These three factors can be combined together to form with the form of various necessity scheduling metric, such as, the application adopts following mode to calculate scheduling metric:
In formula: W
qosfor the quality of service metric of UE, W
sINRfor UE channel quality status parameter, R
ave(t) be UE average accumulated transmission rate, W
sche(ue) for having matched the scheduling metric of UE.
Foregoing describes various embodiment and the mode of texturing of resource allocation methods of the application's LTE MU-MIMO system in detail, and correspondingly, the application also provides the resource allocation device of LTE MU-MIMO system.Referring to Fig. 3, the figure shows the composition structure of an embodiment of resource allocation device of the application's LTE MU-MIMO system.This device comprises: quality of service metric computing unit 301, pairing object select unit 302, pairing processing unit 303 and resource allocation unit 304, wherein:
Quality of service metric computing unit 301, for calculating the quality of service metric of N UE of resource to be allocated, described quality of service metric is used to indicate the quality of service requirements information of UE;
Pairing object select unit 302, forms pairing object set for choose the UE of M resource to be allocated of quality of service metric maximum according to described quality of service metric size, and described M is less than N;
The course of work of said apparatus embodiment is: the quality of service metric that is first calculated N UE of resource to be allocated by quality of service metric computing unit 301, then, the UE that M resource to be allocated of quality of service metric maximum chosen according to the quality of service metric calculating in pairing object select unit 302 forms pairing object set, the UE of the resource to be allocated in pairing processing unit 303 pairs of described pairing object sets matches processing again, finally, resource allocation unit 304 distributes identical running time-frequency resource to the UE of pairing.This device embodiment can obtain the constructed effect with preceding method embodiment, for avoiding repetition, and superfluous words no longer here.
Said apparatus, based on some actual needs, can increase specific functional unit to realize corresponding object.Such as, aforementioned means embodiment can also comprise timing unit and execution number of times control unit, wherein: and timing unit, for setting the preliminary election cycle; Carry out number of times control unit, for being controlled at the number of times of the quality of service metric of N UE of quality of service metric computing unit execution calculating resource to be allocated in the preliminary election cycle and the step of the UE formation pairing object set that the individual resource to be allocated of M of choosing quality of service metric maximum is carried out in pairing object select unit, be less than the quotient of described preliminary election cycle and resource allocation cycle.By increasing this two unit, can avoid each resource allocation cycle to start the rear calculating operation that quality of service metric computing unit carries out computing service quality metric value that all calls, and call pairing object select unit and carry out the selection operation of M UE of quality of service metric maximum, and because the quality of service metric of UE in generally adjacent several resource allocation cycle changes also little, the final pairing object set forming there will not be too large discrepancy, therefore, do not carry out above-mentioned operation and can't bring bad result to the distribution of resource, on the contrary, it can be a large amount of calculation process resource of base station saving.
Except realizing by increasing specific functional unit the Function Extension and technique effect raising of said apparatus embodiment, the different specific implementations of different units in said apparatus embodiment, also may impact its function and technique effect, and then cause the concrete structure of said apparatus embodiment to change.Such as, above-mentioned pairing processing unit 303 can specifically comprise azimuth estimation subelement 3031 and the first pairing processing subelement 3032, and/or, subelement 3034 is processed in speed/efficiency calculation subelement 3033 and the second pairing, wherein: azimuth estimation subelement 3031, for estimate the azimuth of the UE of each resource to be allocated according to the forming coefficient of the UE of each resource to be allocated of pairing object set; Subelement 3032 is processed in the first pairing, for azimuthal difference being greater than to the UE of the resource to be allocated of default correlation threshold value, matches processing; Speed/efficiency calculation subelement 3033, for calculating average transmission rate and/or the actual transmissions spectrum efficiency of UE of each resource to be allocated of pairing object set; Subelement 3034 is processed in the second pairing, and the UE that is less than the resource to be allocated of default spectrum efficiency threshold value for the difference of average transmission rate being less than to the difference of default transmission rate threshold value and/or actual transmissions spectrum efficiency matches processing.Subelement 3034 is processed in speed/efficiency calculation subelement 3033 in above-mentioned each component units and the second pairing can estimate that subelement 3031 and the first pairing process subelement 3032 and be present among a device embodiment simultaneously with azimuth, also can be present in respectively among different device embodiment.Certainly, in actual application, consider the optimization of technique effect, can be integrated in same device, consider each factor of channel relevancy, spectrum efficiency and efficiency of transmission simultaneously.
Also such as, resource allocation unit 304 in said apparatus embodiment can specifically comprise: scheduling metric computation subunit 3041 and resource are distributed subelement 3042, wherein: scheduling metric computation subunit 3041, for calculating the scheduling metric of the UE having matched, described scheduling metric is used to indicate the order that the UE for having matched carries out resource distribution; Resource is distributed subelement 3042, for the UE having matched being distributed to identical running time-frequency resource according to the size of described scheduling metric.
It should be noted that: easy for what narrate, the various distortion implementations of above-described embodiment of this specification and embodiment stress is all the difference with other embodiment or mode of texturing, between each situation identical similar part mutually referring to.Especially, for several improved procedures of device embodiment, because it is substantially similar in appearance to embodiment of the method, so describe fairly simplely, relevant part is referring to the part explanation of embodiment of the method.Each unit of device embodiment described above can or can not be also physically to separate, and both can be positioned at a place, or also can be distributed to a plurality of net environments.In actual application, can select according to the actual needs some or all of unit wherein to realize the object of the present embodiment scheme, those of ordinary skills, in the situation that not paying creative work, are appreciated that and implement.
The above is only the application's embodiment; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the application's protection range.
Claims (11)
1. a resource allocation methods for LTE MU-MIMO system, is characterized in that, the method comprises:
Calculate the quality of service metric of N UE of resource to be allocated, described quality of service metric is used to indicate the quality of service requirements information of UE;
The UE that chooses M resource to be allocated of quality of service metric maximum according to described quality of service metric size forms pairing object set, and described M is less than N;
The UE of the resource to be allocated in described pairing object set is matched to processing;
To the UE having matched, distribute identical running time-frequency resource.
2. method according to claim 1, is characterized in that, described quality of service metric by UE bearer service priority, etc. the urgency of data volume waiting for transmission and/or transfer of data determine.
3. method according to claim 1, it is characterized in that, set the preliminary election cycle, the UE that carries out the quality of service metric of N the UE that calculates resource to be allocated and choose M resource to be allocated of quality of service metric maximum within the preliminary election cycle forms and matches the number of times of step of object set and be less than the quotient of described preliminary election cycle and resource allocation cycle.
4. method according to claim 1, is characterized in that, the described UE to the resource to be allocated in described pairing object set matches to process and specifically comprises:
According to the forming coefficient of the UE of each resource to be allocated in pairing object set, estimate the azimuth of the UE of each resource to be allocated; The UE that azimuthal difference is greater than to the resource to be allocated of default correlation threshold value matches processing; And/or,
Calculate average transmission rate and/or the actual transmissions spectrum efficiency of the UE of each resource to be allocated in pairing object set, the UE that the difference that the difference of average transmission rate is less than to default transmission rate threshold value and/or actual transmissions spectrum efficiency is less than the resource to be allocated of default spectrum efficiency threshold value matches processing.
5. according to the method described in any one in claim 1 to 4, it is characterized in that, the described UE to having matched distributes identical running time-frequency resource specifically to comprise:
The scheduling metric that calculates the UE having matched, described scheduling metric is used to indicate the order that the UE for having matched carries out resource distribution;
According to the size of described scheduling metric, the UE having matched is distributed to identical running time-frequency resource.
6. method according to claim 5, is characterized in that, the scheduling metric of the UE that described calculating has been matched specifically calculates according to the following equation:
In formula: W
qosfor the quality of service metric of UE, W
sINRfor UE channel quality status parameter, R
ave(t) be UE average accumulated transmission rate, W
sche(ue) for having matched the scheduling metric of UE.
7. method according to claim 5, is characterized in that, before the UE of the resource to be allocated in described pairing object set matches processing, described method also comprises:
Calculate the Signal to Interference plus Noise Ratio of the UE of each resource to be allocated in described pairing object set;
The UE that Signal to Interference plus Noise Ratio is greater than to default Signal to Interference plus Noise Ratio threshold value is as matching the UE of the resource to be allocated in object set.
8. a resource allocation device for LTE MU-MIMO system, is characterized in that, this device comprises: quality of service metric computing unit, pairing object select unit, pairing processing unit and resource allocation unit, wherein:
Described quality of service metric computing unit, for calculating the quality of service metric of N UE of resource to be allocated, described quality of service metric is used to indicate the quality of service requirements information of UE;
Described pairing object select unit, forms pairing object set for choose the UE of M resource to be allocated of quality of service metric maximum according to described quality of service metric size, and described M is less than N;
Described pairing processing unit, for matching processing to the UE of the resource to be allocated of described pairing object set;
Described resource allocation unit, distributes identical running time-frequency resource for the UE to pairing.
9. device according to claim 8, is characterized in that, described device also comprises timing unit and execution number of times control unit, wherein:
Described timing unit, for setting the preliminary election cycle;
Described execution number of times control unit, carries out the quality of service metric of N the UE that calculates resource to be allocated and UE that M resource to be allocated choosing quality of service metric maximum carried out in pairing object select unit and forms and match the number of times of step of object set and be less than the quotient of described preliminary election cycle and resource allocation cycle for being controlled at quality of service metric computing unit in the preliminary election cycle.
10. device according to claim 8, is characterized in that, described pairing processing unit specifically comprises azimuth estimation subelement and the first pairing processing subelement, and/or subelement is processed in speed/efficiency calculation subelement and the second pairing, wherein:
Described azimuth estimation subelement, for estimating the azimuth of the UE of each resource to be allocated according to the forming coefficient of the UE of each resource to be allocated of pairing object set;
Subelement is processed in described the first pairing, for azimuthal difference being greater than to the UE of the resource to be allocated of default correlation threshold value, matches processing;
Described speed/efficiency calculation subelement, for calculating average transmission rate and/or the actual transmissions spectrum efficiency of UE of each resource to be allocated of pairing object set;
Subelement is processed in described the second pairing, and the UE that is less than the resource to be allocated of default spectrum efficiency threshold value for the difference of average transmission rate being less than to the difference of default transmission rate threshold value and/or actual transmissions spectrum efficiency matches processing.
Device in 11. according to Claim 8 to 10 described in any one, is characterized in that, described resource allocation unit specifically comprises: scheduling metric computation subunit and resource are distributed subelement, wherein:
Described scheduling metric computation subunit, for calculating the scheduling metric of the UE having matched, described scheduling metric is used to indicate the order that the UE for having matched carries out resource distribution;
Described resource is distributed subelement, for the UE having matched being distributed to identical running time-frequency resource according to the size of described scheduling metric.
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