CN101436921B - Scheduling method and network side equipment - Google Patents
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Abstract
The embodiment of the invention relates to a scheduling method and a network side device. The method comprises the following steps: acquiring connection scheduling speed rates of all connections with data in the current cell; determining the scheduling mode according to the data waiting time delay connected with the current cell when not all the connection scheduling speed rates of all the connections with data meet a speed guarantee; and performing scheduling by adopting the determined scheduling mode. The device comprises an acquiring module, a determining module and a scheduling module. The embodiment of the invention determines the scheduling mode according to the load state in the cell, takes the scheduling speed rate and the time delay guarantee of user connection into consideration comprehensively, and achieves the maximized network throughput while meeting QoS requirements of users.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of dispatching method and network equipment.
Background technology
Long Term Evolution (Long Term Evolution, LTE) technology is mobile phone technique third generation partnership projects (3rd Generation Partnership Project, 3GPP) tissue satisfies novel business demand simultaneously and starts in order to tackle the challenge of broadband access technology.The LTE technology has improved the spectrum efficiency and the traffic rate of wireless communication system greatly, and the support maximum bandwidth is 20MHz.Under this bandwidth, the cell downlink peak rate can reach 100Mbps, and up peak rate can reach 50Mbps.The LTE technology is in physical layer, descending employing OFDM (OFDMA) access technology, and up employing is based on single-carrier frequency division multiple access (SC-FDMA) access technology of OFDM.
Dispatching algorithm is positioned at the medium access control of LTE system, and (Media Access Control, MAC) layer are used to system information or user data to distribute Physical Downlink Shared Channel (Physical Downlinkshared Channel, PDSCH) resource on.Scheduling need satisfied QoS of customer (Qualityof Service, QoS) under the prerequisite, utilize channel condition information CQI (channel quality indicator just as far as possible, CQI) feedback will be considered user's differentiation and fairness simultaneously to obtain maximum system throughput.
(Transmission Time Interval TTI) carries out once scheduling to each Transmission Time Interval, and the time span of a TTI is 1ms.During scheduling, need select user in the current TTI scheduling, the transformat that uses when sending: mix automatic repeat requests (HARQ) redundant version number, Modulation and Coding Scheme (Modulation and Coding Scheme for these user's determination datas, MCS), Resource Block (Resource Block, RB) number, and according to the frequency domain characteristic of subscriber channel decision RB position.
Among the LTE type of service be divided into guarantee bit rate (Guaranteed Bit Rate, GBR) and two kinds of non-GBR (Non-GBR).GBR is professional by connecting GBR of configuration; A gathering of all Non-GBR business configuration of same user maximum bit rate (Aggregate Maximum Bit Rate, AMBR).GBR must satisfy, and AMBR can not satisfy according to network congestion.The QoS of survice parameter that will consider in the scheduling also has: time delay, priority.
In the prior art, the LTE system by max carrier to interference (MAX C/I) scheduling mode, the earliest preferential (EDF) scheduling mode of time limit or equitable proportion (Proportional Fair, PF) scheduling mode is dispatched.
MAX C/I scheduling mode is at each TTI, and the user that can send data ranks by the CQI order from big to small of report, sends the user's data of the CQI maximum of report successively.
The EDF scheduling mode is to be delay parameter of every kind of traffic assignments, and poor according to the time delay time limit professional under the grouping and the time of advent sorted to all groupings, and service is with overdue grouping at first earlier.
The PF scheduling mode is at each TTI, and the user that can send data is according to following formula calculating priority level, then according to priority dispatched users successively from high to low.
Wherein, R
I_max(t) be constantly at t, the peak transfer rate that the user present position is supported, r
i(t) the expression user scheduling rates that arrives of a period of time real income in front.
In realizing process of the present invention, the inventor finds that there is following defective at least in prior art: though the MAXC/I scheduling can access maximum throughput of system, but the resulting service of user is very unfair, the user of low channel quality often can not get the dispatcher meeting, can not guarantee for the user provides speed.Though the EDF scheduling is having best performance aspect the overtime packet loss of grouping that guarantees real time business, throughput of system is lower, can not guarantee for the user provides speed.Though speed and present position that the PF scheduling mode can obtain the user can provide the ratio of speed basic identical, can not guarantee for the user provides speed equally.
Summary of the invention
The embodiment of the invention has proposed a kind of dispatching method and network equipment, guarantees the maximization network throughput of trying one's best with connection scheduling rates, the time delay of taking all factors into consideration the user when satisfying user's qos requirement.
The embodiment of the invention provides a kind of dispatching method, comprising:
All have the connection scheduling rates of the connection of data to obtain current area;
When described all when having the connection scheduling rates of the connection of data not all to satisfy speed to guarantee, the data that connect according to described current area wait for that time delay determines scheduling mode;
Adopt described definite scheduling mode to dispatch;
All have the connection scheduling rates of data all to reach under the situation of speed assurance in described current area, and described scheduling mode is defined as the Proportional Fair mode.
The embodiment of the invention also provides a kind of network equipment, comprising:
Acquisition module, all have the connection scheduling rates of the connection of data to be used to obtain current area;
Determination module, be used for when described all when having the connection scheduling rates of the connection of data not all to satisfy speed to guarantee, the data that connect according to described current area wait for that time delay determines scheduling mode;
Scheduler module, the scheduling mode that is used to adopt described determination module to determine is dispatched; All have the connection scheduling rates of data all to reach under the situation of speed assurance in described current area, and described determination module is defined as the Proportional Fair mode with described scheduling mode.
The embodiment of the invention is determined scheduling mode according to the loading condition in the sub-district, and connection scheduling rates, the time delay of having taken all factors into consideration the user guarantee, have realized the maximization network throughput when satisfying user's qos requirement.
Below by drawings and Examples, the technical scheme of the embodiment of the invention is described in further detail.
Description of drawings
Fig. 1 is the flow chart of dispatching method embodiment of the present invention;
Fig. 2 is the schematic diagram of countershaft situation of change at any time of the scheduling strategy under the normal operation situation among the dispatching method embodiment of the present invention;
Fig. 3 is the structural representation of network equipment embodiment of the present invention.
Embodiment
Fig. 1 is the flow chart of dispatching method embodiment of the present invention, mainly comprises:
The scheduling mode that step 13, employing are determined is dispatched.
In above-mentioned steps 11, the step 12, connect scheduling rates and promptly set up the professional data dispatch speed that connects, speed guarantees to comprise that GBR speed professional and the Non-GBR business guarantees that the GBR business is weighed to guarantee speed, and the Non-GBR business can be weighed by AMBR.
In the above-mentioned steps 12, the data wait time delay that connects according to described current area determines that scheduling mode can comprise:
Wait under the not urgent situation of time delay connecting the data that scheduling rates do not reach in the connection that speed guarantees, select MAX C/I scheduling mode.That is, in the sub-district, if all also do not reach in the connection of speed assurance, its data wait for that time delay is not urgent, then adopt MAX C/I scheduling, with maximum system throughput, improve spectrum efficiency;
Wait under the urgent situation of time delay connecting the data that scheduling rates do not reach in the connection that speed guarantees, select the EDF scheduling mode; That is, if there is the speed of not reaching to guarantee in the sub-district, and the more urgent connection of data wait time delay, then adopt the EDF scheduling, to guarantee professional QoS time delay index.Wherein, the threshold value of the corresponding proportion that whether promptly is provided with according to packet delay of time delay is judged.
Connection scheduling rates in all data has all reached under the situation of speed assurance, selects the PF scheduling mode.That is,, then adopt the PF scheduling, each user is distributed on network surplus resources equitable proportion ground,, both utilized channel to select characteristic frequently, guaranteed certain fairness again with the assurance equitable proportion if the connection of all data has all reached speed and guarantees in the sub-district.
In the foregoing description, can adopt scheduling mode, will dispatch and constantly be divided into sectional dispatching cycle of T based on the cycle
p, the setting of cycle size should be in the rate fluctuation scope that business can be tolerated.For the implementation algorithm target, each TTI in dispatching cycle begins, and wait for that with the data that are connected time delay determines the scheduling mode at this TTI together according to connecting the scheduling rates satisfaction degree in the current area.
In the network, adopt the above-mentioned dispatching method of present embodiment after, the scheduling mode under the normal operation situation at any time the countershaft situation of change as shown in Figure 2, the time window length of Tp wherein for guaranteeing that GBR, AMBR are provided with.
Use the connection scheduling rates in the connection of GBR business whether to reach GBR, can adopt two kinds of methods to weigh: 1) this is connected the data volume that has sent in the current dispatching cycle and surpasses " GBR * dispatching cycle "; 2),, but there have not been data in the formation buffer memory of this connection if the data that sent do not surpass " GBR * dispatching cycle " in end point dispatching cycle.Any one that satisfies in two conditions thinks that all the connection scheduling rates of this connection has reached GBR in this cycle.Equally, whether the connection scheduling rates in the connection of use Non-GBR business reaches AMBR, also can the method weigh, as surpassing " AMBR * dispatching cycle ", can think that the connection scheduling rates in the connection of using the Non-GBR business has reached AMBR when being connected the data volume that has sent in the current dispatching cycle.
In the foregoing description,, can guarantee that also factor-alpha determines its speed assurance by default speed for the Non-GBR business.For the Non-GBR business, all Non-GBR of the same user of regulation connect assurance speed sum and can not surpass AMBR among the LTE.When the gathering of Non-GBR connection guarantees speed smaller or equal to α AMBR, be considered as having equal priority with the GBR business, participate in MAX C/I and EDF scheduling with the GBR business; Guaranteed the GBR and α AMBR of all connections when the sub-district after, surplus resources equitable proportion between Non-GBR connects is distributed, guaranteed the AMBR of Non-GBR with the PF scheduling mode.
Being provided with of α can dynamically change with cell load.When the sub-district is in light condition, in the time of promptly can guaranteeing the GBR of all connections and AMBR, α can be made as 1; When the sub-district is in heavy condition, in the time of promptly only guaranteeing speed that all GBR connect, α can be made as 0; When cell load mediated state, in the time of promptly can guaranteeing all GBR and part A MBR, α can be made as 0.5.Like this, can under the situation that network capacity allows, allow Non-GBR connect and connect the participation scheduling, made full use of the time-varying characteristics of wireless channel, improved spectrum efficiency with GBR.
In the present embodiment, the LTE system determines scheduling mode according to the loading condition in the sub-district, and GBR demand, AMBR constraint, the time delay of having taken all factors into consideration the user guarantee, have realized the maximization network throughput when satisfying user's qos requirement.
When the foregoing description during, will dispatch and be divided into sectional dispatching cycle of T constantly based on periodic scheduling
p, the setting of cycle size should be in the rate fluctuation scope that business can be tolerated.Scheduling process comprises:
In each default dispatching cycle, the user who all service speeds is not reached GBR or α AMBR carries out MAX C/I scheduling.Then, every T
EDF_CheckIndividual TTI checks once current whether occur not reaching speed assurance and the more urgent connection of data wait time delay, if, then carry out the EDF scheduling, otherwise, MAX C/I scheduling continued.At last, when all connect the assurance speed that all reaches GBR or α AMBR in the sub-district, enter the PF scheduling.Wherein, according to the parameter T that waits for that the time delay urgency level is default
EDF_CheckBe used for every T
EDF_CheckWhether individual TTI checks needs to enter the EDF scheduling.As, when waiting for that time delay is urgent, what this parameter can be provided with is a little bit smaller relatively.Dispatch the GBR that has guaranteed the GBR business at EDF and MAX C/I stage.After satisfying, the GBR+ α * AMBR in the Tp window enters the PF scheduling.
The priority of MAX C/I scheduling can be passed through formula:
Priority＝MCS?Level
Obtain.Wherein, MCS is determined jointly by the CQI of user feedback and this user's down transmitting power.
The priority of EDF scheduling can be passed through formula:
Priority＝Time_To_Discard
Obtain.Wherein, Time_To_Discard represents the time interval that first packet distance in the Subscriber Queue abandons.
The priority of PF scheduling can be passed through formula:
Obtain.Wherein, Priority represents priority,
Represent that all k of user Non-GBR connects modulated degree bit number sum, AMBRT
pThe bit number upper limit that the expression user can dispatch in time window, γ
iBe expressed as the weighted factor of the differentiation that realizes User Priority.
Considered in calculating priority level in the PF scheduling that AMBR speed guarantees, has realized the differentiation of different priority users.
Present embodiment can satisfy the delay requirement of channel quality poor user by the EDF scheduling; Guarantee the factor by the speed that the Non-GBR business is set according to sub-district internal burden situation, under the prerequisite that guarantees the GBR business, allow the partial data of Non-GBR business participate in scheduling, make full use of the time-varying characteristics of wireless channel, improve spectrum efficiency with the GBR business; Whether need to enter the EDF scheduling by cyclic check and can adapt to different scenes, the user's real time business that for example is in the edge in the sub-district connects more for a long time, EDF can account for larger proportion in dispatching cycle, and the user's real time business that is in the edge in the sub-district connects more after a little while, and the ratio that EDF accounted in dispatching cycle is also less.
Said method embodiment is applicable to descending scheduling, and when said method was used for uplink scheduling, its mode was basic identical with above-mentioned case description.Difference is that up channel information is by collection reference signal (sounding reference signal, SRS) the feedback acquisition of terminal or reporting of user.During the priority of above-mentioned MAX C/I and PF scheduling mode is calculated, need to consider the SRS of user feedback.
Fig. 3 is the structural representation of network equipment embodiment of the present invention.Network equipment can comprise: acquisition module 31, determination module 32 and scheduler module 33.Acquisition module 31 is used to obtain current area, and all have the connection scheduling rates of the connection of data; Determination module 32 is used for when all have the connection scheduling rates of the connection of data not all to satisfy the speed assurance, and the data wait time delay that connects according to current area is determined scheduling mode.As, the data that do not satisfy in current area in the connection that speed guarantees are waited under the not urgent situation of time delay, and scheduling mode is defined as MAX C/I scheduling mode; The data that do not satisfy in current area in the connection that speed guarantees are waited under the urgent situation of time delay, and scheduling mode is defined as the EDF scheduling mode.Determination module 32 also is used for selecting the EDF scheduling mode according to the default time interval.Determination module 32 also is used in current area all has the connection scheduling rates of the connection of data all to reach under the situation that guarantees bit rate, and scheduling mode is defined as the PF scheduling mode.The scheduling mode that scheduler module 33 is used to adopt determination module 32 to determine is dispatched.
The speed that connects for non-assurance bit rate guarantees, can guarantee that the factor obtains according to default speed, and speed guarantees that the factor is definite according to the load condition of current area, and then the speed that non-assurance bit rate connects in the current area guarantees and can multiply by the gathering maximum bit rate for speed guarantees the factor.
Determination module 32 also was used in default dispatching cycle, if current scheduling mode is the max carrier to interference scheduling mode, whether the wait time delay that detects the data in the connection of not satisfying the speed assurance in current area every the default time interval is urgent, when waiting for that as if the data in the connection of not satisfying the speed assurance in the current area time delay is urgent, scheduling mode is defined as time limit priority scheduling system the earliest, wherein, the Yu She time interval is a positive integer Transmission Time Interval.
Among the said equipment embodiment, the PF scheduling mode that described determination module 32 is selected passes through formula:
Obtain priority; Wherein, Priority represents priority,
Represent that all k of user non-assurance bit rates connect modulated degree bit number sum, AMBRT
pThe bit number upper limit that the expression user can dispatch in world's window, γ
iBe expressed as the weighted factor of the differentiation that realizes User Priority.Above-mentioned network equipment can be the base station, as Node-B.
In the present embodiment, network equipment is determined scheduling strategy according to the loading condition in the sub-district, and GBR demand, AMBR constraint, the time delay of having taken all factors into consideration the user guarantee, have realized the maximization network throughput when satisfying user's qos requirement.
In said method and the system embodiment, determine scheduling strategy according to the loading condition in the sub-district, GBR demand, AMBR constraint, the time delay of having taken all factors into consideration the user guarantee, have realized the maximization network throughput when satisfying user's qos requirement.And, make user's speed that in default dispatching cycle, as far as possible is guaranteed; In dispatching cycle, can guarantee that situation and time delay are waited in the speed that each TTI connects in according to the sub-district to require to determine scheduling mode; Under the prerequisite that does not influence GBR business in the sub-district, dispatch so that All factors being equal, preference will be give to by level with the GBR business for the partial data of Non-GBR business; Use MAX C/I to improve system spectral efficiency as far as possible; Use the EDF scheduling to guarantee the time delay of data dispatching in the relatively poor connection of channel quality; Use PF equitable proportion ground to connect and distribute surplus resources as Non-GBR.Use improved PF priority computing formula, realized the differentiation of different priority users.
The foregoing description not only can be applied in the LTE system, also can in other wireless communication system, use, such as Wideband Code Division Multiple Access (WCDMA) (Wideband Code-Division Multiple Access, WCDMA).
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (11)
1. a dispatching method is characterized in that, comprising:
All have the connection scheduling rates of the connection of data to obtain current area;
When described all when having the connection scheduling rates of the connection of data not all to satisfy speed to guarantee, the data that connect according to described current area wait for that time delay determines scheduling mode;
All have the connection scheduling rates of data all to reach under the situation of speed assurance in described current area, and described scheduling mode is defined as the Proportional Fair mode;
Adopt described definite scheduling mode to dispatch.
2. dispatching method according to claim 1 is characterized in that, the data wait time delay that connects according to described current area determines that scheduling mode comprises:
The data that do not satisfy in described current area in the connection that speed guarantees are waited under the not urgent situation of time delay, described scheduling mode is defined as the max carrier to interference scheduling mode, wherein, the threshold value of the corresponding proportion that whether promptly is provided with according to packet delay of time delay is judged.
3. dispatching method according to claim 1 is characterized in that, the data wait time delay that connects according to described current area determines that scheduling mode comprises:
When the data on not satisfying the connection that speed guarantees in the described current area wait for that time delay is urgent, described scheduling mode is defined as time limit priority scheduling system the earliest, wherein, the threshold value of the corresponding proportion whether time delay promptly is provided with according to packet delay is judged.
4. dispatching method according to claim 1 is characterized in that, described Proportional Fair mode is passed through formula:
Obtain to connect user's priority; Wherein, Priority represents priority,
Represent that all k of user non-assurance bit rates connect modulated degree bit number sum, AMBR * T
pThe bit number upper limit that the expression user can dispatch in time window, Y
iBe expressed as the weighted factor of the differentiation that realizes User Priority.
5. according to each described dispatching method in the claim 1 to 4, it is characterized in that, the speed that non-assurance bit rate connects in the described current area guarantees that the default speed of basis guarantees that the factor obtains, and wherein said speed guarantees that the factor is definite according to the load condition of described current area;
The speed that non-assurance bit rate connects in the described current area guarantees to guarantee that for described speed the factor multiply by the gathering maximum bit rate.
6. dispatching method according to claim 2, it is characterized in that, in default dispatching cycle, if current scheduling mode is described max carrier to interference scheduling mode, whether the wait time delay that detects the data in the connection of not satisfying the speed assurance in described current area every the default time interval is urgent, when waiting for that as if the data in the connection of not satisfying the speed assurance in the described current area time delay is urgent, scheduling mode is defined as time limit priority scheduling system the earliest, wherein, the described default time interval is a positive integer Transmission Time Interval.
7. a network equipment is characterized in that, comprising:
Acquisition module, all have the connection scheduling rates of the connection of data to be used to obtain current area;
Determination module, be used for when described all when having the connection scheduling rates of the connection of data not all to satisfy speed to guarantee, the data that connect according to described current area wait for that time delay determines scheduling mode;
Scheduler module, the scheduling mode that is used to adopt described determination module to determine is dispatched; All have the connection scheduling rates of data all to reach under the situation of speed assurance in described current area, and described determination module is defined as the Proportional Fair mode with described scheduling mode.
8. network equipment according to claim 7, it is characterized in that, the data that do not satisfy in described current area in the connection that speed guarantees wait for that described determination module is defined as the max carrier to interference scheduling mode with described scheduling mode under the not urgent situation of time delay;
Data on connecting in described current area wait for that described determination module is defined as time limit priority scheduling system the earliest with described scheduling mode under the urgent situation of time delay;
Wherein, the threshold value of the corresponding proportion that whether promptly is provided with according to packet delay of time delay is judged.
9. network equipment according to claim 7 is characterized in that, described Proportional Fair mode is passed through formula:
Obtain to connect user's priority; Wherein, Priority represents priority,
Represent that all k of user non-assurance bit rates connect modulated degree bit number sum, AMBR * T
pThe bit number upper limit that the expression user can dispatch in time window, Y
iBe expressed as the weighted factor of the differentiation that realizes User Priority.
10. according to each described network equipment in the claim 7 to 9, it is characterized in that, the speed that non-assurance bit rate connects in the described current area guarantees that the default speed of basis guarantees that the factor obtains, and wherein said speed guarantees that the factor is definite according to the load condition of described current area;
The speed that non-assurance bit rate connects in the described current area guarantees to guarantee that for described speed the factor multiply by the gathering maximum bit rate;
The speed that then described determination module connects according to described non-assurance bit rate guarantees to judge whether the connection scheduling rates that described non-assurance bit rate connects reaches its speed assurance.
11. network equipment according to claim 8, it is characterized in that, in default dispatching cycle, if current scheduling mode is described max carrier to interference scheduling mode, whether then described determination module detects the data in the connection of not satisfying the speed assurance in described current area every the default time interval wait time delay is urgent, when waiting for that as if the data in the connection of not satisfying the speed assurance in the described current area time delay is urgent, scheduling mode is defined as time limit priority scheduling system the earliest, wherein, the described default time interval is a positive integer Transmission Time Interval.
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| CN101990271A (en) * | 2009-08-05 | 2011-03-23 | 北京大学 | Communication method between base state and terminal, wireless communication base station and system |
| CN102083207B (en) * | 2009-11-30 | 2013-06-05 | 中国移动通信集团北京有限公司 | Method and relevant device for scheduling HS-PDSCH (high-speed physical downlink shared channel) resources |
| CN101827446B (en) * | 2010-04-09 | 2012-09-05 | 新邮通信设备有限公司 | Radio bearer scheduling method and device |
| CN101895933B (en) * | 2010-06-30 | 2014-04-09 | 中兴通讯股份有限公司 | Load distribution method and base station |
| CN104581968B (en) * | 2013-10-24 | 2019-02-05 | 普天信息技术研究院有限公司 | A method of dispatching non-guaranteed bit rate traffic |
| CN104619034B (en) * | 2015-01-16 | 2018-06-19 | 电子科技大学 | Towards the grouping scheduling method of real time business in a kind of LTE communication system |
| CN111769899B (en) * | 2019-03-30 | 2021-10-01 | 华为技术有限公司 | Method and device for determining transmission resources |
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