CN101568156A - Method and device for radio resource scheduling and base station - Google Patents

Method and device for radio resource scheduling and base station Download PDF

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Publication number
CN101568156A
CN101568156A CNA2008101050229A CN200810105022A CN101568156A CN 101568156 A CN101568156 A CN 101568156A CN A2008101050229 A CNA2008101050229 A CN A2008101050229A CN 200810105022 A CN200810105022 A CN 200810105022A CN 101568156 A CN101568156 A CN 101568156A
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user
real
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carrier wave
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CN101568156B (en
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雷海鹏
王亚峰
沈晓冬
李男
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China Mobile Communications Group Co Ltd
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China Mobile Communications Group Co Ltd
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Abstract

The invention discloses a method for radio resource scheduling, which comprises the following steps: aiming at carrier clusters to be scheduled, determining scheduling information of each real-time service user and scheduling information of each non-real time service user containing the current queue time delay of the non-real time service user; according to the determined scheduling information of each user, calculating the priority of each user on the carrier clusters to be scheduled; and scheduling the carrier clusters to be scheduled to the user with calculated highest priority. Correspondingly, the invention also discloses a device for radio resource scheduling and a base station. The invention can fairly treat the real-time service users and the non-real time service users on the basis of simultaneously ensuring Qos of the real-time service users and the non-real time service users, and ensure the service continuity of the non-real time service users.

Description

Scheduling method for wireless resource and device thereof, base station
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of scheduling method for wireless resource and device thereof, base station.
Background technology
Providing at the same time in the communication system of real time business and non-real-time service, all is to calculate the priority of each user on carrier resource to be scheduled respectively usually, then carrier resource to be scheduled is distributed to the highest user of priority thereon.
As shown in Figure 1, for the scheduling schematic diagram of packet radio scheduling scheme in the prior art, on down link, the data buffering formation of a correspondence is set up in the base station for each user; In each dispatching cycle, the user measures the channel conditions of oneself, and by the dedicated uplink feedback channel self channel conditions is fed back to the base station.The base station is determined each user retrievable instantaneous data rates on carrier resource to be scheduled respectively according to the channel conditions of each user feedback, and the instantaneous data rates that on carrier resource to be scheduled, obtains according to each user who determines, and each user's out of Memory, as user's queue length, service quality (QoS), queuing delay etc., calculate the dispatching priority of each user on carrier resource to be scheduled, according to priority orders each user is sorted then, and carrier resource to be scheduled is distributed to the highest user of priority.
Wherein the packet scheduling on the wireless fading channel is a very important research direction in the communications field always.On the one hand, mobile communication system is a resource limited system, how to utilize limited system resource to satisfy growing user's request, mobile communication system manufacturer and operator's urgent problem have been become, this just requires mobile communication system to utilize existing Radio Resource more rationally, fully, utilizes limited system resource to provide better service for more user as much as possible.On the other hand, in present mobile communication system, need support multiple business simultaneously, such as, VoIP, FTP, WWW, E-mail, business such as Video Streaming.Different business has different qos requirements, how to ensure the QoS demand of different business, also is a very important research direction in the mobile communication system.
Therefore as a key technology, the wireless resource scheduling technology has become whether mobile communication system system of measurement is feasible, the criterion of system service quality good or not.The wireless resource scheduling scheme can make full use of the time-varying characteristics of channel under the prerequisite that guarantees QoS of survice efficiently, realizes multi-user diversity gain, to improve the professional Mean Speed and the resistance to overturning of system.Wherein the wireless resource scheduling scheme must be taken into account efficient and fair two aspects, that is to say, should make the best CU resource of channel condition to improve throughput of system, also to make the relatively poor relatively user of channel condition can access the dispatcher meeting within a certain period of time, guarantee continuity that it is professional and the fairness between the user.
But provide at the same time in the mobile communication system of real time business and non-real-time service at present, when carrying out scheduling of resource for the user, usually do not consider non-real-time service user's queuing delay factor, will cause the real time business user's of same channel conditions dispatching priority always to be higher than non-real-time service user's dispatching priority like this, make the real time business user always preferentially obtain scheduling, and make the non-real-time service user can not get scheduling for a long time, thereby have influence on non-real-time service user's business continuance, and lose fairness the non-real-time service user.
Summary of the invention
The invention provides a kind of scheduling method for wireless resource and device thereof, base station, on the basis that guarantees real time business user and non-real-time service user QoS at the same time, be impartial to real time business user and non-real-time service user guarantee non-real-time service user's business continuance.
The invention provides a kind of scheduling method for wireless resource, comprise, determine each real time business user's schedule information, and each comprises the non-real-time service user's of the current queuing delay of non-real-time service user schedule information at carrier wave to be scheduled bunch; According to each user's who determines schedule information, calculate the priority of each user on this carrier wave to be scheduled bunch; And this carrier wave to be scheduled bunch scheduling given the highest user of priority calculate.
The present invention also provides a kind of wireless resource scheduling device, comprise the schedule information determining unit, be used for determine each real time business user's schedule information, and each comprising the non-real-time service user's of the current queuing delay of non-real-time service user schedule information at carrier wave to be scheduled bunch; Priority calculation unit is used for the schedule information according to each user who determines, calculates the priority of each user on this carrier wave to be scheduled bunch; And scheduling unit, be used for giving the highest user of priority who calculates with this carrier wave to be scheduled bunch scheduling.
The present invention also provides a kind of base station, comprise the schedule information determining unit, be used for determine each real time business user's schedule information, and each comprising the non-real-time service user's of the current queuing delay of non-real-time service user schedule information at carrier wave to be scheduled bunch; Priority calculation unit is used for the schedule information according to each user who determines, calculates the priority of each user on this carrier wave to be scheduled bunch; And scheduling unit, be used for giving the highest user of priority who calculates with this carrier wave to be scheduled bunch scheduling.
Wireless resource scheduling scheme of the present invention provides in the mobile communication system of real time business and non-real-time service at the same time, when carrying out scheduling of resource, taken into full account non-real-time service user's queuing delay, like this will be on the basis of basic assurance real time business user QoS, avoided real time business user's priority always to be higher than non-real-time service user's priority, cause the non-real-time service user to can not get scheduling for a long time, thereby guaranteed non-real-time service user's business continuance and QoS preferably.
Description of drawings
Below in conjunction with each accompanying drawing the specific implementation process of technical solution of the present invention is carried out elaboration, wherein in each accompanying drawing:
Fig. 1 is the scheduling schematic diagram of packet radio scheduling scheme in the prior art;
Fig. 2 is the embodiment process chart of scheduling method for wireless resource of the present invention;
Fig. 3 is the utility function curve synoptic diagram that the queuing delay of real time business user and non-real-time service user among the present invention program changes;
Fig. 4 is the concrete composition structured flowchart of resource scheduling device of the present invention.
Embodiment
Design concept of the present invention is at the same time real time business user and non-real-time service user to be carried out in the mobile communication system of scheduling of resource, take into full account non-real-time service user's queuing delay, avoid the non-real-time service user to can not get scheduling for a long time, thereby on the basis of basic assurance real time business user QoS, guarantee non-real-time service user's business continuance and QoS.
As shown in Figure 2, be the embodiment process chart of scheduling method for wireless resource of the present invention, its specific implementation process is as follows:
Step 10, at the carrier wave to be scheduled bunch (Resource Block that a plurality of carrier waves lump together on the carrier wave bunch finger frequency domain, can comprise a subcarrier or at least two subcarriers), determine each real time business user's schedule information, and determine that each comprises the non-real-time service user's of the current queuing delay of non-real-time service user schedule information;
Step 20 according to above-mentioned definite each user's schedule information, is calculated the priority of each user on this carrier wave to be scheduled bunch respectively;
Step 30 according to the precedence information of each user who calculates on this carrier wave to be scheduled bunch, is given this carrier wave to be scheduled bunch scheduling the highest user of priority who calculates.
Technical solution of the present invention is come the satisfaction of assesses user to wireless communication system, i.e. user's QoS by using the utility function theory in the microeconomics.The main thought of utility function is that system resource (as bandwidth, power etc.) or performance index (as data speed, time delay etc.) are mapped to corresponding value of utility, to be used for optimizing whole communication system.Utility function all plays a part very crucial at aspects such as RRM and guarantee user qos requirements.
The embodiment of the invention is used U here k(d k) represent the utility function of user k, promptly use U k(d k) representative of consumer k is to the satisfaction of mobile communication system, d kThe queuing delay of expression user k.Because along with the increase of queuing delay, user's satisfaction descends gradually, and this utility function should be successively decreased; And, allowing queuing delay the closer to this maximum for the maximum permission queuing delay that business is stipulated, user's satisfaction descends fast more, and more away from the place of this maximum permission queuing delay, the user takes notice of less very much more.So the derivative of this utility function also successively decreases, and be negative value.So U k(d k) should be a non-negative monotone decreasing convex function.Total be exactly the utility function value of the optimization aim of embodiment of the invention maximization that is to say to allow all users' satisfaction (qos value) sum maximum.
Based on above-mentioned principle, the embodiment of the invention provides following optimization aim function here:
max Σ k = 1 K U k ( d k )
over?d k≥0，1≤k≤K
Wherein, K is the number of excited users in the sub-district.
The embodiment of the invention is used r K, m(n) expression user k in current scheduling time slot n on carrier wave bunch m obtainable instantaneous data rates, generally can be according to the channel quality status of real time business user and non-real-time service reporting of user, determine real time business user and non-real-time service user respectively in current scheduling time slot n, obtainable instantaneous data rates on this carrier wave to be scheduled bunch.
Calculate the Mean Speed of user k in current scheduling time slot n according to following account form:
R k ( n ) = ( 1 - 1 T c ) R k ( n - 1 ) + 1 T c r k ( n - 1 ) ;
R wherein k(n) represent the Mean Speed that user k obtains in current scheduling time slot n; R k(n-1) Mean Speed of expression user k in a last time slot scheduling n-1; T cExpression sliding time window, normally slot length T sIntegral multiple; Wherein:
r k ( n - 1 ) = Σ m = 1 M r k , m ( n - 1 ) · δ k ( n - 1 ) ;
r k(n-1) represent user k in a last time slot scheduling n-1, the instantaneous data rates sum on each carrier wave bunch m that is dispatched to; r K, m(n-1) expression user k is in last a time slot scheduling n-1, the instantaneous data rates of acquisition on m the carrier wave that is dispatched to bunch; δ k(n-1) be the variable of expression carrier wave bunch distribution condition, if m carrier wave bunch given the user k n-1 time slot allocation, δ then k(n-1)=1, otherwise, δ then k(n-1)=0; M is for the carrier wave number of clusters order of dispatching in the system.Disturb in the sub-district, in each time slot scheduling, multiple-input and multiple-output (MIMO) channel of each carrier wave bunch correspondence can only be distributed to a user uniquely, so equation is arranged Σ k = 1 : K δ k , m ( n - 1 ) = 1 Set up, if user k is not scheduled for any carrier wave bunch, then r in n-1 time slot k(n-1)=0.
If use d k(n) the expression queuing delay of user k in current scheduling time slot n, then according to above-mentioned definite each non-real-time service user's schedule information, calculate the priority of each non-real-time service user on this carrier wave to be scheduled bunch in the following manner:
k ^ = | ∂ U k ( 1 ) ∂ d k | · r k , m ( n ) R k ( n ) ;
And, calculate the priority of each real time business user on this carrier wave to be scheduled bunch in the following manner according to above-mentioned definite each real time business user's schedule information:
k ^ = | ∂ U k ( 2 ) ∂ d k | · r k , m ( n ) R k ( n ) · w ;
Wherein,
Figure A20081010502200103
The priority of expression user k on this carrier wave to be scheduled bunch; r K, m(n) instantaneous data rates that in current scheduling time slot n, on this carrier wave to be scheduled bunch, obtains of expression user k; R k(n) represent the Mean Speed that user k obtains in current scheduling time slot n; W is a correction factor, is used for regulating according to actual conditions real time business user's priority, and wherein w is big more, helps improving real time business user's priority more, is traditionally arranged to be the numerical value greater than 1;
Figure A20081010502200104
Expression and non-real-time service user's queuing delay, the first relevant utility function of maximum queuing delay that non-real-time service allows;
Figure A20081010502200105
Expression and real time business user's queuing delay, the second relevant utility function of maximum queuing delay that real time business allows.Can change functional value or select different utility functions according to real business demand particularly.
Should be the non-negative subtraction function of a strictly monotone with user's queuing delay as the utility function of index, and epirelief.The embodiment of the invention is here with s type function f (t)=1-(1+e -α (t-β)) -1, α＞0, β＞0 are example, as real time business user's utility function.Wherein, parametric t is represented real time business user's queuing delay, and β represents the maximum queuing delay that real time business allows; α and β determine the position of the slope and the gradient mid point of this utility function respectively.Usually, α is big more, and the gradient of this utility function is just precipitous more, and utility function is also just big more at the absolute value of the derivative of gradient mid point.
Wherein, mainly contain the consideration of the following aspects for the real time business user selects the s type function:
(1) before downward trend appears in the s type function, generally all more smooth, so its derivative absolute value is less, so during this period of time, the non-real-time service user can preferentially obtain scheduling;
(2) when maximum queuing delay that real time business user's queuing delay allows near real time business, this moment, the s type function began to descend, the severe degree that descends is determined by α, α is big more, decline Shaoxing opera is strong, the absolute value of its derivative is also just big more, makes the real time business user obtain higher scheduling weights, to reduce real time business user's packet loss;
(3) because the characteristics of s type function, when real time business user's queuing delay surpasses the maximum queuing delay of real time business permission, value of utility is not to drop to 0 immediately, but a process that descends is gradually arranged, can make the real time business user continue to participate in the scheduling of resource like this, thereby can further reduce real time business user's packet loss.
For the non-real-time service user, because its requirement to queuing delay is so strict unlike the real time business user, if but the service that can't accept for a long time also can cause non-real-time service user's satisfaction to descend.So non-real-time service user's queuing delay is commonly referred to as " soft time delay ", along with the increase of queuing delay, its utility function value also can descend gradually.Therefore, the embodiment of the invention is selected f (t)=1-ce here for use A (t-b), a＞0, b＞0, c＞0 is as non-real-time service user's utility function.Wherein t represents non-real-time service user's queuing delay, and b represents the maximum queuing delay that non-real-time service allows; A, c and b determine slope, amplitude and the delay requirement of this utility function respectively.
As shown in Figure 3, the utility function curve synoptic diagram that changes for real time business user among the present invention program and non-real-time service user's queuing delay.
According to the aforementioned calculation mode, the dispatching priority of each user on this carrier wave to be scheduled bunch m can be calculated, and therefrom selects the user with maximum dispatching priority
Figure A20081010502200111
Should distribute to the user by a carrier wave to be scheduled bunch m
Figure A20081010502200112
Then,, dispatch next carrier wave bunch again according to identical scheduling scheme, up to all carrier waves bunch be scheduled finish till.The user who is scheduled for carrier wave bunch just can be at its corresponding channel data bit.
Corresponding, the present invention also provides a kind of wireless resource scheduling device, this device is generally the base station equipment in the communication system, as shown in Figure 4, be the concrete composition structured flowchart of resource scheduling device of the present invention, wherein the schedule information determining unit 100, are used at carrier wave to be scheduled bunch, determine each real time business user's schedule information, and determine that each comprises the non-real-time service user's of the current queuing delay of non-real-time service user schedule information; Priority calculation unit 200 is used for each user's of determining according to schedule information determining unit 100 schedule information, calculates the priority of each user on this carrier wave to be scheduled bunch; Scheduling unit 300 is used for the highest user of priority who calculates to priority calculation unit 200 this carrier wave to be scheduled bunch scheduling.
In the above-mentioned wireless resource scheduling device, the specific implementation of schedule information determining unit 100 definite real time business users' schedule information and non-real-time service user's schedule information, and priority calculation unit 200 is according to each real time business user's schedule information and each non-real-time service user's schedule information, calculate the account form of the priority of each user on this carrier wave to be scheduled bunch, in the concrete enforcement of said method, elaborate, no longer give unnecessary details here.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (10)

1, a kind of scheduling method for wireless resource is characterized in that, comprising:
At carrier wave to be scheduled bunch, determine each real time business user's schedule information, and each comprises the non-real-time service user's of the current queuing delay of non-real-time service user schedule information;
According to each user's who determines schedule information, calculate the priority of each user on this carrier wave to be scheduled bunch; And
This carrier wave to be scheduled bunch scheduling is given the highest user of priority who calculates.
2, the method for claim 1, it is characterized in that, comprise the instantaneous data rates that maximum queuing delay that the current queuing delay of the current Mean Speed of real time business user, real time business user, real time business allow and real time business user obtain in described real time business user's the schedule information on this carrier wave to be scheduled bunch;
Also comprise the instantaneous data rates that maximum queuing delay that the current Mean Speed of non-real-time service user, non-real-time service allow and non-real-time service user obtain in described non-real-time service user's the schedule information on this carrier wave to be scheduled bunch.
3, method as claimed in claim 2 is characterized in that, according to each the non-real-time service user's who determines schedule information, calculates the priority of each non-real-time service user on this carrier wave to be scheduled bunch in the following manner:
k ^ = | ∂ U k ( 1 ) ∂ d k | · r k , m ( n ) R k ( n ) ;
Wherein,
Figure A2008101050220002C2
The priority of expression user k on this carrier wave to be scheduled bunch;
r K, m(n) instantaneous data rates that in current scheduling time slot n, on this carrier wave to be scheduled bunch, obtains of expression user k;
R k(n) represent the Mean Speed that user k obtains in current scheduling time slot n;
Figure A2008101050220002C3
Expression and non-real-time service user's queuing delay, the first relevant utility function of maximum queuing delay that non-real-time service allows.
4, method as claimed in claim 3 is characterized in that, according to each the real time business user's who determines schedule information, calculates the priority of each real time business user on this carrier wave to be scheduled bunch in the following manner:
k ^ = | ∂ U k ( 2 ) ∂ d k | · r k , m ( n ) R k ( n ) · w ;
Wherein, w is a correction factor, is used for regulating according to actual conditions real time business user's priority;
Figure A2008101050220003C2
Expression and real time business user's queuing delay, the second relevant utility function of maximum queuing delay that real time business allows.
5, method as claimed in claim 3 is characterized in that, described first utility function is:
f(t)＝1-ce a(t-b)；
Wherein, t represents non-real-time service user's queuing delay;
B represents the maximum queuing delay that non-real-time service allows;
a＞0，b＞0，c＞0。
6, method as claimed in claim 4 is characterized in that, described second utility function is:
f(t)＝1-(1+e -α(t-β)) -1；
Wherein, t represents real time business user's queuing delay;
β represents the maximum queuing delay that real time business allows;
α＞0，β＞0。
7, method as claimed in claim 2 is characterized in that, calculates real time business user and the current Mean Speed of non-real-time service user according to following account form:
R k ( n ) = ( 1 - 1 T c ) R k ( n - 1 ) + 1 T c r k ( n - 1 ) ;
R k(n) represent the Mean Speed that user k obtains in current scheduling time slot n;
R k(n-1) Mean Speed of expression user k in a last time slot scheduling n-1;
T cThe expression sliding time window;
Wherein r k ( n - 1 ) = Σ m = 1 M r k , m ( n - 1 ) · δ k ( n - 1 )
r k(n-1) represent user k in a last time slot scheduling n-1, the instantaneous data rates sum on each carrier wave bunch m that is dispatched to;
r K, m(n-1) expression user k is in last a time slot scheduling n-1, the instantaneous data rates of acquisition on m the carrier wave that is dispatched to bunch;
δ k(n-1) be the variable of expression carrier wave bunch distribution condition, if m carrier wave bunch given the user k n-1 time slot allocation, δ then k(n-1)=1, otherwise, δ then k(n-1)=0;
M is for the carrier wave number of clusters order of dispatching in the system.
8, method as claimed in claim 2 is characterized in that, according to the channel quality status of real time business user and non-real-time service reporting of user, determines real time business user and the non-real-time service user instantaneous data rates on this carrier wave to be scheduled bunch respectively.
9, a kind of wireless resource scheduling device is characterized in that, comprising:
The schedule information determining unit is used for determine each real time business user's schedule information, and each comprising the non-real-time service user's of the current queuing delay of non-real-time service user schedule information at carrier wave to be scheduled bunch;
Priority calculation unit is used for the schedule information according to each user who determines, calculates the priority of each user on this carrier wave to be scheduled bunch; And
Scheduling unit is used for giving the highest user of priority who calculates with this carrier wave to be scheduled bunch scheduling.
10, a kind of base station is characterized in that, comprising:
The schedule information determining unit is used for determine each real time business user's schedule information, and each comprising the non-real-time service user's of the current queuing delay of non-real-time service user schedule information at carrier wave to be scheduled bunch;
Priority calculation unit is used for the schedule information according to each user who determines, calculates the priority of each user on this carrier wave to be scheduled bunch; And
Scheduling unit is used for giving the highest user of priority who calculates with this carrier wave to be scheduled bunch scheduling.
CN2008101050229A 2008-04-25 2008-04-25 Method and device for radio resource scheduling and base station Expired - Fee Related CN101568156B (en)

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CN105636210A (en) * 2014-11-13 2016-06-01 中兴通讯股份有限公司 Method and apparatus for allocating resource
CN105873128A (en) * 2016-05-31 2016-08-17 杭州电子科技大学 LTE fairness scheduling method based on time delay sensitivity
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CN102668653B (en) * 2009-09-28 2015-09-16 三星电子株式会社 The method and apparatus of the transmitting power for user scheduling and in supervisory communications
CN105636210A (en) * 2014-11-13 2016-06-01 中兴通讯股份有限公司 Method and apparatus for allocating resource
CN105873128A (en) * 2016-05-31 2016-08-17 杭州电子科技大学 LTE fairness scheduling method based on time delay sensitivity
CN105873128B (en) * 2016-05-31 2019-05-14 杭州电子科技大学 A kind of LTE fairness dispatching method based on delay sensitive
CN109548161A (en) * 2018-12-17 2019-03-29 深圳信息职业技术学院 A kind of method, apparatus and terminal device of wireless resource scheduling

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