CN103442446A - Dynamic and semi-static combined dispatching method in LTE system - Google Patents
Dynamic and semi-static combined dispatching method in LTE system Download PDFInfo
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Abstract
The invention discloses a dynamic and semi-static combined dispatching method in an LTE system. The method comprises the steps that a base station obtains status information and parameters, so that whether service flows are retransmitted or not is determined, if not, whether the service flows are VoIP services is further determined, and a dynamic dispatching mechanism or a semi-static dispatching mechanism is carried out on the different service flows. Due to the fact that the semi-static dispatching mechanism and the dynamic dispatching mechanism are combined, the problem of service quality of real-time services and the throughput of non-real-time services are both considered, signaling resources are saved, and limited resources are fully utilized for achieving a better dispatching effect. Furthermore, on the basis of the dynamic dispatching mechanism, according to the improvement on an existing algorithm, calculation can be simplified on the premise that the real-time services and a bit rate are guaranteed, and secondary allocation on remaining resources is achieved. The dynamic and semi-static combined dispatching method in the LTE system can be widely applied in the field of wireless communication.
Description
Technical field
The present invention relates to wireless communication field, dynamic and semi-static combined scheduling method in especially a kind of LTE system.
Background technology
Terminological interpretation:
LTE:Long Term Evolution(Long Term Evolution);
3GPP:The Third Generation Partnership Project(third generation partner program);
The access control of MAC:Medium Access Control(media);
TTI:Transmission Time Interval(Transmission Time Interval);
RB:Resource Block(Resource Block);
IP:Internet Protocol(Internet Protocol);
QoS:Quality of Service(service quality);
GBR:Guaranteed Bit Rate(guarantees bit rate);
MBR:Maximum Bit Rate(Maximum Bit Rate);
Max C/I:Maximum Carrier/Interference(max carrier to interference algorithm);
RR:Round Robin(polling algorithm);
PF:Proportional Fair(direct ratio fair algorithm);
The maximum weighted time delay that M-LWDF:Modified Largest Weighted Delay First(revises is preferential);
HOL:Head of Line(team head);
RRC:Radio Resource Control(Radio Resource is controlled);
PDCCH:Physical Downlink Control Channel(Physical Downlink Control Channel);
SPS:Semi-Persistent Scheduling(semi-persistent scheduling);
VoIP:Voice over IP(IP voice);
The Video:(video stream traffic);
The permanent bit rate of CBR:Constant Bit Rate();
BE:Infinite Buffer(infinite buffer);
The request of HARQ:Hybrid Automatic Repeat-reQuest(mixed automatic retransfer).
Along with mobile subscriber's continuous growth, people expect that following generation cellular network provides ubiquitous broadband-access.Under this background, for the performance that makes system more levels off to the Shannon's theorems limit, LTE has adopted the RRM process, has especially adopted towards the scheduling mechanism of the complete IP network framework of packet switching, and has carried traditional speech business with voip technology.Packet scheduling is responsible for the selection of time and frequency resource, under different scenes, according to decisions such as channel condition and qos requirements, how to distribute limited Radio Resource.Meanwhile, scheduler should be obtained effective balance between throughput, fairness and complexity.
Domestic and international many papers have proposed the improving one's methods of prioritization of dispatching algorithm, as Siyue Sun and Qiyue Tu at article " A Configurable Dual-Mode Algorithm on Delay-Aware Low-Computation Scheduling and Resource Allocation in LTE Downlink " Wireless Communications and Networking Conference:MAC and Cross-Layer Design, to dispatch in 2012IEEE with resource and be divided into three subproblems: scheduling type, dispatching priority and data dispatching amount, a kind of configurable double mode scheduling scheme has been proposed on this basis.Under non-real-time service, priority is according to the ratio sequence of channel quality and Mean Speed, and under real time business, the QCI of prioritization and business is inversely proportional to.Although simplified the complexity of scheduling, do not consider other parameters of QoS, as GBR, MBR etc., the resource while simultaneously also considering to transmit parcel efficiently utilize problem, and do not consider the situation that the base station side buffer area is limited.
In addition, existing scheduling mechanism mainly contains three kinds: static scheduling is machine-processed, dynamic dispatching is machine-processed and semi-persistent scheduling is machine-processed.
Although dynamic dispatching mechanism is more flexible, need a large amount of control signals, the transmission of possible blocking data bag.Though, and semi-persistent scheduling mechanism can be saved the LTE system effectively for dispatching the PDCCH resource of indication, be only applicable to wrap the VoIP class business little, that certain transmission cycle is arranged.
At present, existing dispatching algorithm is only for dynamic dispatching mechanism, and can not meet preferably throughput and the service quality QoS requirements of system under the mixed service scene.The dispatching algorithm of three kinds of classics: Max C/I, RR and PF all do not consider the time delay of grouping, are not suitable for real time business.And the M-LWDF algorithm is suitable for high data rate traffic, considered the HOL delay, improved the performance of real time business, but be a kind of dispatching algorithm of non-justice, be unsuitable for non-real-time service.
The characteristics of static scheduling mechanism are not consider the real time status of channel, and resource is distributed fixing and lasting whole business; Shortcoming is that resource distributes the dumb wasting of resources more serious.The characteristics of dynamic dispatching mechanism are each TTI, according to the channel condition of user feedback, dynamically carry out scheduling of resource, enjoy the time-frequency domain full-diversity of channel; Its shortcoming is to need a large amount of control signals, the transmission of possible blocking data bag.And semi-persistent scheduling mechanism is to carry out initial configuration by RRC, retransmits and transfer dynamic dispatching to, mainly for the VoIP business.Characteristics are once to authorize, and the cycle is used, and can effectively save the LTE system for dispatching the PDCCH resource of indication.
In sum, three kinds of scheduling mechanisms respectively have pluses and minuses, and LTE is aimed at the multiple services scene of multi-user.If we organically combine dynamic dispatching mechanism and semi-persistent scheduling mechanism, dynamic dispatching plays critical effect in LTE, and semi-persistent scheduling effectively supplements it.Will certainly make moderate progress to the time delay of the throughput of system, spectrum efficiency, business and packet loss etc.
Summary of the invention
In order to solve the problems of the technologies described above, the objective of the invention is: provide a kind of for different business characteristics, adopt the LTE scheduling mode of different scheduling mechanisms, and considered the service quality problem of real time business, taken into account again in the LTE system of throughput of non-real-time service dynamically and semi-static combined scheduling method.
The technical solution adopted in the present invention is: dynamic and semi-static combined scheduling method in a kind of LTE system comprises the following steps:
101, base station obtains the QoS parameter of buffer status information and each Business Stream;
102, according to the above-mentioned state information of obtaining and parameter, judge whether descending Business Stream waiting for transmission is re-transmission, if, perform step 105, if not, perform step 103;
103, according to the above-mentioned state information of obtaining and parameter, judge whether descending Business Stream waiting for transmission is VoIP class business, if, perform step 104, if not, perform step 106;
104, carry out the dispatching algorithm under semi-persistent scheduling mechanism, then finish this scheduling;
105, judged whether resources left, if, perform step 106, if not, finish this scheduling;
106, carry out the dispatching algorithm under dynamic dispatching mechanism, and Resources allocation, this scheduling then finished.
Further, described step 101 comprises following sub-step:
201, base station receives the cycle of unique user or the CQI of non-periodic feedback;
202, base station dispatcher reads above-mentioned user's the average transmission rate of each Business Stream before current transmission time interval.
Further, described step 102 comprises following sub-step:
203,, for real time business, calculate the rate compensation factor of each Business Stream waiting for transmission of above-mentioned user; For non-real-time service, do not calculate the rate compensation factor;
204,, according to CQI, average transmission rate and/or the rate compensation factor of above-mentioned user feedback, calculate the priority factors of each Business Stream waiting for transmission of above-mentioned user at each Resource Block;
205, the institute before repeating in steps, until obtain all Business Streams priority factors on each Resource Block in Transmission Time Interval of all users;
206, by the according to priority sequence from high to low of all Business Streams waiting for transmission, the Business Stream priority of re-transmission is the highest;
207, judge that according to the sequence of above-mentioned priority whether descending Business Stream waiting for transmission is re-transmission, if perform step 105, otherwise performs step 103.
Further, described step 106 comprises following sub-step:
208, carry out the dispatching algorithm under dynamic dispatching mechanism;
209, delete the Business Stream of having dispatched from traffic stream queues waiting for transmission, refresh traffic stream queues waiting for transmission;
210, judge whether to exist Business Stream waiting for transmission, if re-execute step 207, otherwise finish this scheduling.
Further, described step 104 comprises following sub-step:
301, judge whether semi-persistent scheduling mechanism is activated, if perform step 302, otherwise perform step 304;
302, the resource that preferential configuration is retained;
When 303, configuration parameter need to change, stop semi-persistent scheduling mechanism and activate, then finish this scheduling;
304, the dispatch indication of controlling according to Radio Resource, in fixing Resource Block transmitting VoIP class business, and the recording dispatching parameter;
305, activate semi-persistent scheduling mechanism, then finish this scheduling.
Further, in described step 203, the formula of computation rate compensating factor is:
Wherein, GBR
ibe the assurance bit rate of i business,
for the average transmission rate described in above-mentioned steps 202, the identify label that k is described unique user.
Further, in described step 204, each Business Stream waiting for transmission that calculates above-mentioned user at the formula of the priority factors of Resource Block is:
Wherein, CQI is CQI, and θ is configurable weight factor, and μ is adjustable priority factors, δ
ithe parameter relevant to service quality;
the time delay fraction, wherein, D
k,i(t) be the receptible maximum delay of user, T
k,ifor delay threshold.
The invention has the beneficial effects as follows: the present invention utilizes semi-persistent scheduling mechanism and dynamic dispatching mechanism to combine, both considered the service quality problem of real time business, taken into account again the throughput of non-real-time service, the saving signaling resource, take full advantage of limited resources to reach better dispatching effect.In addition, under dynamic dispatching mechanism, can guarantee under the prerequisite of guaranteeing bit rate of real time business to simplify calculating to the improvement of existing algorithm, and realize surplus resources is carried out to secondary distribution.
The accompanying drawing explanation
The flow chart of steps that Fig. 1 is the inventive method;
The flow chart of steps that Fig. 2 is dynamic dispatching mechanism in the inventive method;
The flow chart of steps that Fig. 3 is semi-persistent scheduling mechanism in the inventive method.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
With reference to Fig. 1, dynamic and semi-static combined scheduling method in a kind of LTE system comprises the following steps:
101, base station obtains the QoS parameter of buffer status information and each Business Stream;
Be designated as t at each current transmission time interval TTI() suppose that base station side is unlimited buffer size, base station obtains the state information of buffering area and the qos parameter of each Business Stream;
102, according to the above-mentioned state information of obtaining and parameter, judge whether descending Business Stream waiting for transmission is re-transmission, if, perform step 105, if not, perform step 103;
Implementation concrete in this step is: scheduler knows by the indication of checking the HARQ management entity whether re-transmission is arranged.
103, according to the above-mentioned state information of obtaining and parameter, judge whether descending Business Stream waiting for transmission is VoIP class business, if, perform step 104, if not, perform step 106;
104, carry out the dispatching algorithm under semi-persistent scheduling mechanism, then finish this scheduling;
105, judged whether resources left, if, perform step 106, if not, finish this scheduling;
106, carry out the dispatching algorithm under dynamic dispatching mechanism, and Resources allocation, this scheduling then finished.
The priority level initializing of each Business Stream: the Business Stream of re-transmission has limit priority, and adopts dynamic dispatching mechanism; In new business, VoIP class business adopts semi-persistent scheduling mechanism, and other business adopt dynamic dispatching mechanism.In dynamic dispatching mechanism, according to real-time still non-real-time service, adopt respectively different dispatching priority computing formula to carry out prioritization, then give the highest traffic flow assignment Radio Resource of priority.
With reference to Fig. 2, be further used as preferred embodiment, described step 101 comprises following sub-step:
201, base station receives the cycle of unique user k or the channel quality indicator CQI of non-periodic feedback;
CQI is above-mentioned buffer status information, and buffer status information also comprises the qos parameter of each Business Stream waiting for transmission in the base station side buffering area etc. in addition;
202, base station dispatcher reads the average transmission rate of each Business Stream before current transmission time interval TTI of above-mentioned user k
If current time is t Transmission Time Interval TTI, the average transmission rate of each Business Stream before current transmission time interval TTI is
be the QoS parameter of each Business Stream.
With reference to Fig. 2, be further used as preferred embodiment, described step 102 comprises following sub-step:
203,, for real time business, calculate the rate compensation factor ρ of each Business Stream waiting for transmission of above-mentioned user k
k,i(t); For non-real-time service, do not calculate the rate compensation factor;
204, the channel quality indicator CQI, the average transmission rate that according to above-mentioned user k, feed back
and/or rate compensation factor ρ
k,i(t), calculate the priority factors P of each Business Stream waiting for transmission of above-mentioned user at each Resource Block
k,i;
205, the institute before repeating in steps, until obtain all Business Streams priority factors P on each Resource Block in Transmission Time Interval TTI of all users
k,i;
206, by the according to priority sequence from high to low of all Business Streams waiting for transmission, the Business Stream priority of re-transmission is the highest;
207, judge that according to the sequence of above-mentioned priority whether descending Business Stream waiting for transmission is re-transmission, if perform step 105, otherwise performs step 103.
With reference to Fig. 2, be further used as preferred embodiment, described step 106 comprises following sub-step:
208, carry out the dispatching algorithm under dynamic dispatching mechanism;
209, delete the Business Stream of having dispatched from traffic stream queues waiting for transmission, refresh traffic stream queues waiting for transmission;
210, judge whether to exist Business Stream waiting for transmission, if re-execute step 207, otherwise finish this scheduling.
After this finishing scheduling, the result of scheduling will be stored in the DCI form, by the PDCCH transmission to the user.And the scheduling Business Stream by the PDSCH transmission to the user.
With reference to Fig. 3, be further used as preferred embodiment, described step 104 comprises following sub-step:
301, judge whether semi-persistent scheduling mechanism is activated, if perform step 302, otherwise perform step 304;
302, the resource that preferential configuration is retained;
When 303, configuration parameter need to change, stop semi-persistent scheduling mechanism and activate, then finish this scheduling;
304, indicate CQI according to the dispatch of radio resource control RRC, in fixing Resource Block transmitting VoIP class business, and the recording dispatching parameter;
305, activate semi-persistent scheduling mechanism, then finish this scheduling.
Be further used as preferred embodiment, in described step 203, the formula of computation rate compensating factor is:
Wherein, GBR
ibe the assurance bit rate GBR of i business,
for the average transmission rate described in above-mentioned steps 202, the identify label that k is described unique user.
When
the time, show that the Mean Speed of user k does not reach business GBR
irequirement, now the weight factor of user k is by the compensation of index access form.And, for the user who has reached user that business GBR requires and Non-GBR and require, the value of compensating factor is 1, has guaranteed like this GBR requirement of customer service by restriction and indemnifying measure, can support LTE mixed service scene.
Be further used as preferred embodiment, in described step 204, calculate the priority factors P of each Business Stream waiting for transmission of above-mentioned user k at Resource Block
k,iformula be:
Wherein, CQI is CQI, and θ is configurable weight factor, can weigh fairness between the user and the resource utilization of system.Through after the system-level emulation of LTE-Sim repeatedly, determine that θ gets 2 o'clock best results, μ is adjustable priority factors, δ
ithe parameter relevant to service quality;
the time delay fraction, wherein, D
k,i(t) be the receptible maximum delay of user, T
k,ifor delay threshold.
μ is larger, and the priority of non-real-time service is higher, and throughput is just larger, still along with the increase of μ, can cause the average packet time delay of real time business to increase, thereby has increased the possibility of packet loss.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art can also make all equivalents or replacement under the prerequisite without prejudice to spirit of the present invention, and the distortion that these are equal to or replacement all are included in the application's claim limited range.
Claims (7)
- In a LTE system dynamically with semi-static combined scheduling method, it is characterized in that: comprise the following steps:101, base station obtains the QoS parameter of buffer status information and each Business Stream;102, according to the above-mentioned state information of obtaining and parameter, judge whether descending Business Stream waiting for transmission is re-transmission, if, perform step 105, if not, perform step 103;103, according to the above-mentioned state information of obtaining and parameter, judge whether descending Business Stream waiting for transmission is VoIP class business, if, perform step 104, if not, perform step 106;104, carry out the dispatching algorithm under semi-persistent scheduling mechanism, then finish this scheduling;105, judged whether resources left, if, perform step 106, if not, finish this scheduling;106, carry out the dispatching algorithm under dynamic dispatching mechanism, and Resources allocation, this scheduling then finished.
- In a kind of LTE system according to claim 1 dynamically with semi-static combined scheduling method, it is characterized in that: described step 101 comprises following sub-step:201, base station receives the cycle of unique user or the CQI of non-periodic feedback;202, base station dispatcher reads above-mentioned user's the average transmission rate of each Business Stream before current transmission time interval.
- In a kind of LTE system according to claim 2 dynamically with semi-static combined scheduling method, it is characterized in that: described step 102 comprises following sub-step:203,, for real time business, calculate the rate compensation factor of each Business Stream waiting for transmission of above-mentioned user; For non-real-time service, do not calculate the rate compensation factor;204,, according to CQI, average transmission rate and/or the rate compensation factor of above-mentioned user feedback, calculate the priority factors of each Business Stream waiting for transmission of above-mentioned user at each Resource Block;205, the institute before repeating in steps, until obtain all Business Streams priority factors on each Resource Block in Transmission Time Interval of all users;206, by the according to priority sequence from high to low of all Business Streams waiting for transmission, the Business Stream priority of re-transmission is the highest;207, judge that according to the sequence of above-mentioned priority whether descending Business Stream waiting for transmission is re-transmission, if perform step 105, otherwise performs step 103.
- In a kind of LTE system according to claim 3 dynamically with semi-static combined scheduling method, it is characterized in that: described step 106 comprises following sub-step:208, carry out the dispatching algorithm under dynamic dispatching mechanism;209, delete the Business Stream of having dispatched from traffic stream queues waiting for transmission, refresh traffic stream queues waiting for transmission;210, judge in traffic stream queues waiting for transmission and whether have Business Stream waiting for transmission, if re-execute step 207, otherwise finish this scheduling.
- In a kind of LTE system according to claim 1 dynamically with semi-static combined scheduling method, it is characterized in that: described step 104 comprises following sub-step:301, judge whether semi-persistent scheduling mechanism is activated, if perform step 302, otherwise perform step 304;302, the resource that preferential configuration is retained;When 303, configuration parameter need to change, stop semi-persistent scheduling mechanism and activate, then finish this scheduling;304, the dispatch indication of controlling according to Radio Resource, in fixing Resource Block transmitting VoIP class business, and the recording dispatching parameter;305, activate semi-persistent scheduling mechanism, then finish this scheduling.
- In a kind of LTE system according to claim 3 dynamically with semi-static combined scheduling method, it is characterized in that: in described step 203, the formula of computation rate compensating factor is:
- In a kind of LTE system according to claim 6 dynamically with semi-static combined scheduling method, it is characterized in that: in described step 204, each Business Stream waiting for transmission that calculates above-mentioned user at the formula of the priority factors of Resource Block is:Wherein, CQI is CQI, and θ is configurable weight factor, and μ is adjustable priority factors, δ ithe parameter relevant to service quality; the time delay fraction, wherein, D k,i(t) be the receptible maximum delay of user, T k,ifor delay threshold.
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CN104507173A (en) * | 2015-01-19 | 2015-04-08 | 中国人民解放军国防科学技术大学 | Voice service upstream resource half persistence scheduling method and device directed at 3G (the 3rd generation telecommunication)/4G (the fourth generation telecommunication) mobile communication network |
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CN106162914A (en) * | 2015-04-22 | 2016-11-23 | 普天信息技术有限公司 | A kind of semi-static method with dynamic mixed scheduling in LTE system |
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CN107409065A (en) * | 2015-04-08 | 2017-11-28 | 华为技术有限公司 | A kind of quality of service measures method, apparatus and a kind of base station |
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CN106162914B (en) * | 2015-04-22 | 2020-05-08 | 普天信息技术有限公司 | Semi-static and dynamic hybrid scheduling method in LTE system |
CN106604404A (en) * | 2015-10-20 | 2017-04-26 | 大唐移动通信设备有限公司 | Method and device for service scheduling |
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