CN105517178B - A kind of dispatching method of adjustable low complex degree wireless resource scheduling device - Google Patents

A kind of dispatching method of adjustable low complex degree wireless resource scheduling device Download PDF

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CN105517178B
CN105517178B CN201510952084.3A CN201510952084A CN105517178B CN 105517178 B CN105517178 B CN 105517178B CN 201510952084 A CN201510952084 A CN 201510952084A CN 105517178 B CN105517178 B CN 105517178B
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user
grade
priority
fair
scheduling device
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CN105517178A (en
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梅妍
谢孟昊
施渊籍
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Nanjing Panda Electronics Co Ltd
Nanjing Panda Communication Technology Co Ltd
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Nanjing Panda Electronics Co Ltd
Nanjing Panda Communication Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
    • H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a kind of dispatching methods of adjustable low complex degree wireless resource scheduling device, it is according to PF dispatching algorithm, design a kind of wireless resource scheduling device for being applied to TD-LTE enterprise-level base station (Femtocell), comprehensively consider efficiency, fairness, and have computation complexity low, model is simple, the flexible adjustable feature of operator, allow operator to carry out fairness in face of wireless resource scheduling device by OAM configuration page and efficiency stresses the flexible modulation of degree, and computation complexity is low, and system delay can be effectively reduced.

Description

A kind of dispatching method of adjustable low complex degree wireless resource scheduling device
Technical field
The present invention relates to a kind of dispatching methods of adjustable low complex degree wireless resource scheduling device, belong to mobile communication skill Art field.
Background technique
Mobile communication system belongs to resource limited system, and mobile subscriber number is in lasting rapid growth, therefore such as Limited radio resource is carried out reasonable distribution by what between multi-user meets growing user demand, is always mobile communication One Important Problems of system manufacturer and operator's concern.
LTE introduces shared channel mechanism, needs to solve the problems, such as more UE multi-service competition shared resources.In LTE system, Scheduling of resource is mainly realized by the scheduler that eNodeB is located at MAC layer, and can be divided into uplink and downlink scheduler, is each responsible for The shared channel resources of reasonable distribution uplink and downlink, the thread of usual uplink are logic channel (Logical Channel, abbreviation LC), and the thread of downlink is logic channel group (Logical Channel Group, abbreviation LCG).
Common dispatching algorithm has max carrier to interference (Maximum C/I) algorithm, poll (RR) class algorithm, PF algorithm. In each frame, all preferentially the selection highest connection of carrier/interface ratio is serviced Maximum C/I algorithm, and the system that this algorithm obtains gulps down The amount of spitting is the upper bound of all dispatching algorithms, but has ignored fairness, and the UE that channel quality can be made poor is unable to get service, draws " starvation " for sending out channel quality user low.RR algorithm is with Maximum C/I algorithm on the contrary, it is not with maximum system throughput Target, because of the channel quality without considering UE, the user of the chances ground in scheduling system such as far as possible, although can guarantee fairness, It is lower to will cause communication system efficiency.PF algorithm is a kind of half fairness dispatch, defines an index DRC/R, wherein DRC is The maximum transmission rate that one user can be supported under present channel carrier/interface ratio, R are a user whithin a period of time flat Equal rate value, at each Transmission Time Interval (Transmission time intervel, abbreviation TTI), scheduler selection is adjusted The highest user of index DRC/R is spent, therefore PF algorithm has taken into account fairness and efficiency.
Each communication equipment producer has nothing in common with each other for the implementation method of wireless resource scheduling algorithm.A kind of reasonable wireless money Source dispatching algorithm usually requires to comprehensively consider the quality of wireless channel of user equipment (UE), the fairness of user and user's Grade of service etc..In LTE communication system, channel quality with channel quality indicate (Channel Quality Indication, Hereinafter referred to as CQI) it indicates, CQI shares 15 grades, respectively represent different user channel qualities.The UE grade of service is usual With QoS grade designation (QoS class identifier, abbreviation QCI), corresponding different business is for priority, time delay, error code The demand of rate etc..
When wireless resource scheduling algorithm is applied in practical communication equipment, in addition to comprehensively consider user as described above CQI grade, fairness, business QCI grade etc., it is also necessary to have the characteristics of low complex degree, it is possible to reduce consumption reduces time delay, And operator is generally intended to be can carry out autonomous configuration to resource scheduling algorithm, specific according to practical radio communication environment and user Demand etc. carries out flexible modulation in scheduling weighing factor to efficiency, fairness.
Summary of the invention
The purpose of the present invention is according to PF dispatching algorithm, and comprehensively consider efficiency, fairness, and there is computation complexity Low, model is simple, the flexible adjustable feature of operator, provides and a kind of is applied to TD-LTE enterprise-level base station (Femtocell) Wireless resource scheduling device dispatching method.
The technical solution adopted by the present invention is that: a kind of dispatching method of adjustable low complex degree wireless resource scheduling device, It is characterized by comprising following steps:
Step 1: for inside, each has the user of business transmission demand for the base station TD-LTE first, counts it and has sent Rate Rserved, i.e. user obtained dispatcher meeting and transmitted the Mean Speed of data；Then protocol stack dispatches each waiting The R of userservedAnd its CQI grade and QoS of survice grade are input to wireless resource scheduling device as input parameter；
Step 2: operator configures the page by the OAM of TD-LTE enterprise-level base station and is imitated according to their own needs Rate factor-alphaefficWith fairness index βfairConfiguration, αefficAnd βfairAs input parameter, the wireless money being input in protocol stack In the scheduler of source；
Step 3: as described in step 1 and two, for each user, wireless resource scheduling device all has five inputs Parameter, respectively efficiency factor αeffic, fairness index βfair, transmission rate Rserved, CQI grade and QoS grade；Firstly, nothing Line Resource Scheduler is according to user's CQI grade of input, QoS grade and Rserved, the initial efficiency comes first grade of user is calculated Coefficient, service priority coefficient and fair priorities coefficient, use Prio respectivelyeffic, PrioQos, PriofairTo indicate；Then, The efficiency factor α that wireless resource scheduling device scheduler is configured in conjunction with operatorefficWith fairness index βfairUser is calculated Weighting efficiency comes first grade coefficientWith weighted-fair priority factor
Step 4: radio resource Resource Scheduler is according to the weighting efficiency comes first grade coefficient of userWeighted-fair Priority factorWith service priority FACTOR P rioQos, the final dispatching priority value of the user is calculated；
Step 5: all dispatching priority values for waiting scheduling user are ranked up by wireless resource scheduling device, i.e., first All users are inserted into priority query by the sequencing of application business, and all assign maximum dispatching priority value, agreement CQI is reported and can be triggered wireless resource scheduling device with distribution request and recalculate dispatching priority value in stack, carries out priority query It reorders；In each dispatching cycle, all the selection highest user of dispatching priority value is scheduled.
In scheme, the CQI of user has 15 grades in TD-LTE, and QoS grade has 9 grades, in step 1, association Discussing stack will be in rank M and N the input scheduling device of user CQI and QCI；Data rate R has been sent for userserved, wireless to provide Source scheduler can calculate user " grade of service " according to this value, and the grade of service is divided by wireless resource scheduling device 255 grades, for unsecured rate business, according to RservedThe section that/AMBR is fallen into obtains the grade of service；For rate Guarantee business, according to RservedThe section that/GBR is fallen into obtains the grade of service, wherein the grade of service is indicated with L.
In scheme, the efficiency factor αefficWith fairness index βfairValue range be 0-10, if do not configured, Take default value 10.
In scheme, wireless resource scheduling device has starting efficiency priority factor table PrioEffi [15], initial fair excellent First grade coefficient table PrioFair [255] and initial service priority factor table PrioQos [9], coefficient value therein respectively by with Family CQI, user have serviced Mean Speed, and QCI and the mathematical relationship of the total rate of system obtain；Wireless resource scheduling device is according to step M in one, N, L search priority factor table, available Prioeffic=PrioEffi [M], PrioQos=PrioQos [N], Priofair=PrioFair [L]；The efficiency factor and fairness index that radio resource Resource Scheduler is configured according to operator calculate Weighting efficiency comes first grade coefficient, weighted-fair priority factor, and exponentially to starting efficiency priority factor value and public affairs Flat priority factor value is weighted, that is,For When efficiency factor is 0, then weighted priority value is 1, can shield influence of the factor to scheduling completely；It is public when fairness index is 0 Levelling is shielded, and the user that channel quality is good almost occupies whole dispatcher meetings；As efficiency factor increases, weighted priority value Index rises, and when efficiency factor is 10, then weighted priority value is initial priority value.
The beneficial effects of the present invention are: the present invention can make operator by the OAM configuration page of enterprise-level base station in face of nothing Line Resource Scheduler carries out fairness and efficiency stresses the adjusting of degree.If operator wishes to obtain higher system throughput Amount can configure higher value for efficiency factor, and the corresponding dispatching priority of user with higher CQI grade can be more in this way It is high；If operator does not pay the utmost attention to throughput of system, and the scheduling for being desirable to user can be more fair, then can be justice The factor configures higher value, and adding up the less user of the data volume serviced in this way can be scheduled device priority scheduling.When efficiency because When son is configured to zero, user CQI no longer has an impact scheduling, thus scheduler is converted into RR dispatcher by PF scheduling mechanism System.When fairness index is configured to zero, scheduler is converted into Max C/I scheduling mechanism by PF scheduling mechanism.The present invention considers Operator can be realized the flexible configuration of efficiency and fairness, the configuration of practical business priority by same method；This Outside, the mathematical model that the scheduler in the present invention uses is simple, meets TD-LTE enterprise-level base station for algorithm low complex degree It is required that Time Delay of Systems can be effectively reduced.
Detailed description of the invention
Fig. 1 is flow diagram of the invention.
Fig. 2 is to be tested using TM500 (industrywide standard base station testing instrument) Resource Scheduler performance；Prerequisite Are as follows: TM500 simulates two terminal UEs 1 and the SNR (signal-to-noise ratio) of UE2, UE1 are 5dB lower than UE2, and 2 are established downlink between UE and eNB Continuous non-GBR business；10 are configured by efficiency factor, fairness index is configured to 0, and the tune of UE1 and UE2 is counted in 1 minute It spends number and draws as schemed.
Fig. 3 is to be tested using TM500 Resource Scheduler performance；The same Fig. 2 of prerequisite, strong efficiency factor are configured to 4, fairness index is configured to 10, and the scheduling times of UE1 and UE2 are counted in 1 minute and are drawn as schemed.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Step 1: the CQI of user has 15 grades, QoS grade, that is, QCI (QoS Class in TD-LTE Identifier) there are 9 grades, protocol stack only need to be by rank M and the N input scheduling of user CQI and QCI in step 1 In device.Data rate R has been sent for userserved, that is, user obtained dispatcher meeting and transmitted the average speed of data Rate, scheduler can calculate user " grade of service " according to this value, and the grade of service is divided into 255 etc. by scheduler Grade.For non-GBR (unsecured rate) business, definition has AMBR (accumulative maximum bit rate), the i.e. non-of user in LTE The upper limit of the sum of GBR traffic rate.Section (0,1) is equally divided into 255 sections, i.e. (0,1/255) by scheduler, (1/255, 2/255),…,(244/255,1).Scheduler is according to RservedThe section that/AMBR is fallen into obtains the grade of service, for example, if Rserved/ AMBR fall into section (1/255,2/255) then its grade of service be 2.For GBR (rate guarantee) business, in LTE Definition has GBR (guaranteeing bit rate), and similarly non-GBR business, scheduler can be according to RservedThe section that/GBR is fallen into, obtains The grade of service of user out.The grade of service is indicated with L.
Step 2: efficiency factor α is arranged in operatorefficWith fairness index βfair。αeffic, βfairValue range be (0 ..., 10) take default value 10 if do not configured.
Step 3: Resource Scheduler has starting efficiency priority factor table PrioEffi [15], initial fair priorities Coefficient table PrioFair [255] and initial service priority factor table PrioQos [9], coefficient value therein is respectively by user CQI, user have serviced Mean Speed, and QCI and the mathematical relationship of the total rate of system obtain.Scheduler according to M, the N in step 1, L searches priority factor table, available Prioeffic=PrioEffi [M], PrioQos=PrioQos [N], Priofair= PrioFair[L].The efficiency factor and fairness index that radio resource Resource Scheduler is configured according to operator calculate weighting efficiency Priority factor, weighted-fair priority factor.Scheduler is exponentially to starting efficiency priority value and fair priorities Value is weighted, that is,To be when efficiency factor 0, then weighted priority value is 1, can shield influence of the factor to scheduling completely.Such as Fig. 2, when fairness index is 0, fairness quilt Shielding, the user that channel quality is good almost occupy whole dispatcher meetings.As efficiency factor increases, in weighted priority value index number It rises.When efficiency factor is 10, then weighted priority value is initial priority value.
Step 4: scheduler will weight efficiency comes first grade value, weighted-fair priority value and service priority value be multiplied that is, Prioeffic*PrioQos*Priofair, obtain the final dispatching priority value of user.
Step 5: all users are inserted into priority query by the sequencing of application business first by scheduler, and all assign Maximum dispatching priority value is given, CQI is reported and can be triggered scheduler with distribution request and recalculate dispatching priority in protocol stack Value carries out priority query and reorders.The highest user of current priority is chosen in each scheduler dispatching cycle to be scheduled.
Part that the present invention does not relate to is the same as those in the prior art or can be realized by using the prior art.

Claims (4)

1. a kind of dispatching method of adjustable low complex degree wireless resource scheduling device, it is characterised in that include the following steps:
Step 1: for inside, each has the user of business transmission demand for the base station TD-LTE first, counts its transmission rate Rserved, i.e. user obtained dispatcher meeting and transmitted the Mean Speed of data；Then each waiting is dispatched user by protocol stack RservedAnd its CQI grade and QoS of survice grade are input to wireless resource scheduling device as input parameter；
Step 2: operator configures the page by the OAM of TD-LTE enterprise-level base station, according to their own needs, carry out efficiency because Sub- αefficWith fairness index βfairConfiguration, αefficAnd βfairAs input parameter, the radio resource tune being input in protocol stack It spends in device；
Step 3: as described in step 1 and two, for each user, wireless resource scheduling device all has five input ginsengs Number, respectively efficiency factor αeffic, fairness index βfair, transmission rate Rserved, CQI grade and QoS grade；Firstly, wireless Resource Scheduler is according to user's CQI grade of input, QoS grade and Rserved, the initial efficiency comes first grade system of user is calculated Number, service priority coefficient and fair priorities coefficient, use Prio respectivelyeffic, PrioQos, PriofairTo indicate；Then, nothing The efficiency factor α that line Resource Scheduler scheduler is configured in conjunction with operatorefficWith fairness index βfairIt is calculated user's Weight efficiency comes first grade coefficientWith weighted-fair priority factor
Step 4: radio resource Resource Scheduler is according to the weighting efficiency comes first grade coefficient of userWeighted-fair is preferential Grade coefficientWith service priority FACTOR P rioQos, the final dispatching priority value of the user is calculated；
Step 5: all dispatching priority values for waiting scheduling user are ranked up by wireless resource scheduling device, i.e., first by institute There is user to be inserted into priority query by the sequencing of application business, and all assign maximum dispatching priority value, in protocol stack CQI is reported and can be triggered wireless resource scheduling device with distribution request and recalculate dispatching priority value, carries out priority query's rearrangement Sequence；In each dispatching cycle, all the selection highest user of dispatching priority value is scheduled.
2. a kind of dispatching method of adjustable low complex degree wireless resource scheduling device according to claim 1, feature Be: the CQI of user has 15 grades in TD-LTE, and QoS grade has 9 grades, and in step 1, protocol stack is by user In rank M and N the input scheduling device of CQI and QCI；Data rate R has been sent for userserved, wireless resource scheduling device meeting It is calculated according to this value " grade of service " of user, the grade of service is divided into 255 grades by wireless resource scheduling device, right In unsecured rate business, according to RservedThe section that/AMBR is fallen into obtains the grade of service；For rate guarantee business, root According to RservedThe section that/GBR is fallen into obtains the grade of service, wherein the grade of service is indicated with L.
3. a kind of dispatching method of adjustable low complex degree wireless resource scheduling device according to claim 1 or 2, special Sign is: the efficiency factor αefficWith fairness index βfairValue range be that 0-10 if do not configured takes default Value 10.
4. a kind of dispatching method of adjustable low complex degree wireless resource scheduling device according to claim 3, feature Be: wireless resource scheduling device has starting efficiency priority factor table PrioEffi [15], initial fair priorities coefficient table PrioFair [255] and initial service priority factor table PrioQos [9], coefficient value therein is respectively by user CQI, user Mean Speed is serviced, QCI and the mathematical relationship of the total rate of system obtain；Wireless resource scheduling device according to M, the N in step 1, L searches priority factor table, available Prioeffic=PrioEffi [M], PrioQos=PrioQos [N], Priofair= PrioFair[L]；The efficiency factor and fairness index that radio resource Resource Scheduler is configured according to operator calculate weighting efficiency Priority factor, weighted-fair priority factor, and exponentially to starting efficiency priority factor and fair priorities system Number is weighted, that is,When efficiency factor be 0, Then weighted priority value is 1, can shield influence of the efficiency factor to scheduling completely；When fairness index is 0, fairness is shielded It covers, the user that channel quality is good almost occupies whole dispatcher meetings；As efficiency factor increases, in weighted priority value index number It rises, when efficiency factor is 10, then weighted priority value is initial priority value.
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CN106028453B (en) * 2016-07-01 2019-04-16 南京邮电大学 Wireless dummy network resource cross-layer scheduling mapping method based on queueing theory
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CN102083221A (en) * 2009-11-27 2011-06-01 中国移动通信集团北京有限公司 Resource scheduling method and device based on HSDPA (high speed downlink packet access)
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