CN103442446B - Dynamic and semi-static combined scheduling method in a kind of LTE system - Google Patents
Dynamic and semi-static combined scheduling method in a kind of LTE system Download PDFInfo
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Abstract
The invention discloses dynamic in a kind of LTE system and semi-static combined scheduling method, the steps include: that base station obtains status information and parameter, thus judge whether Business Stream is re-transmission, as no, then and then determine whether VoIP class business, different Business Streams is performed dynamic dispatching mechanism or semi-persistent scheduling mechanism.The present invention utilizes semi-persistent scheduling mechanism and dynamic dispatching mechanism to combine, and has both considered the service quality problem of real time business, has taken into account again the handling capacity of non-real-time service, saving signaling resource, has taken full advantage of limited resources to reach more preferable dispatching effect.Additionally, under dynamic dispatching mechanism, to the improvement of existing algorithm can guarantee real time business guarantee bit rate on the premise of simplify and calculate, and realize surplus resources is carried out secondary distribution.The present invention dynamically can be widely applied to wireless communication field with semi-static combined scheduling method as in a kind of LTE system.
Description
Technical field
The present invention relates to wireless communication field, dynamically with semi-static in especially a kind of LTE system
Combined scheduling method.
Background technology
Term is explained:
LTE:Long Term Evolution(Long Term Evolution)；
The 3GPP:The Third Generation Partnership Project(third generation closes
Make Partnership Program)；
MAC:Medium Access Control(medium education)；
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(Proportional-Fair algorithm)；
M-LWDF:Modified Largest Weighted Delay First(revises
The most temporary prolong preferential)；
HOL:Head of Line(team head)；
RRC:Radio Resource Control(wireless heterogeneous networks)；
PDCCH:Physical Downlink Control Channel(physical down controls letter
Road)；
SPS:Semi-Persistent Scheduling(semi-persistent scheduling)；
VoIP:Voice over IP(IP voice)；
Video:(video stream traffic)；
CBR:Constant Bit Rate(perseverance bit rate)；
BE:Infinite Buffer(infinite buffer)；
HARQ:Hybrid Automatic Repeat-reQuest(hybrid automatic repeat-request).
Along with the continuous growth of mobile subscriber, people expect that future-generation cellular network provides nowhere
Not broadband-access.Under this background, in order to make the performance of system more level off to Shannon calmly
The reason limit, LTE have employed RRM process, in particular by towards packet switch
The scheduling mechanism of complete IP network framework, and with the traditional speech business of voip technology carrying.
Packet scheduling is responsible for the selection of time and frequency resource, according to channel condition under different scenes
Determine how to distribute limited Radio Resource with qos requirement etc..Meanwhile, scheduler should
Effective balance is obtained between handling capacity, fairness and complexity.
The most many papers propose the improved method of the prioritization of dispatching algorithm, as
Siyue Sun and Qiyue Tu is 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, 2012IEEE
Middle scheduling and resource are divided into three subproblems: scheduling type, dispatching priority and scheduling
Data volume, proposes a kind of configurable double mode scheduling scheme on this basis.Non real-time industry
The lower priority of business sorts, under real time business, preferentially according to the ratio of channel quality and Mean Speed
Level sequence is inversely proportional to the QCI of business.Although simplifying the complexity of scheduling, but do not consider
Other parameters of QoS, such as GBR, MBR etc., do not consider to transmit resource during parcel the most yet
Efficient Utilizing question, and do not consider the situation that base station side buffer area is limited.
Additionally, existing scheduling mechanism mainly has three kinds: static scheduling mechanism, dynamic dispatching machine
System and semi-persistent scheduling mechanism.
Although dynamic dispatching mechanism is more flexible, but needs substantial amounts of control signaling, may block
The transmission of packet.And though semi-persistent scheduling mechanism can be effectively saved LTE system for adjusting
The PDCCH resource of degree instruction, but be only applicable to wrap little, to have certain transmission cycle VoIP
Class business.
At present, existing dispatching algorithm is machine-processed only for dynamic dispatching, and can not be the most satisfied
The handling capacity of system and service quality QoS requirements under mixed service scene.Three kinds of classical scheduling
Algorithm: Max C/I, RR and PF all do not consider the time delay of packet, are not suitable for real time business.
And M-LWDF algorithm is suitable to high data rate traffic, it is contemplated that HOL postpones, improve in real time
The performance of business, but it is the dispatching algorithm of a kind of non-justice, it is unsuitable for non-real-time service.
The feature of static scheduling mechanism is not consider the real time status of channel, resource distribution fixing and
Continue whole business；Shortcoming is that the resource dumb wasting of resources of distribution is more serious.Dynamic dispatching machine
The feature of system is each TTI, dynamically carries out scheduling of resource according to the channel condition of user feedback,
Enjoy the time-frequency domain full-diversity of channel；Its shortcoming is to need substantial amounts of control signaling, may block
The transmission of packet.And semi-persistent scheduling mechanism is to be carried out initial configuration by RRC, re-transmission transfers to
Dynamic dispatching, mainly for VoIP business.Feature is a sub-authorization, and the cycle uses, permissible
Effective LTE system of saving is for dispatching the PDCCH resource of instruction.
In sum, three kinds of scheduling mechanisms are respectively arranged with pluses and minuses, and LTE to be aimed at multi-user many
The scene of business.If we organically combine dynamic dispatching mechanism and semi-persistent scheduling mechanism
Coming, dynamic dispatching plays critical effect in LTE, and it is effectively mended by semi-persistent scheduling
Fill.The handling capacity of system, spectrum efficiency, the time delay of business and packet loss etc. will certainly be changed
Kind.
Summary of the invention
In order to solve above-mentioned technical problem, it is an object of the invention to: provide a kind of for different
Business characteristic, uses the LTE scheduling mode of different scheduling mechanisms, and considers real time business
Service quality problem, dynamically with half in the LTE system of the handling capacity taking into account again non-real-time service
Static combined scheduling method.
The technical solution adopted in the present invention is: dynamically combine with semi-static in a kind of LTE system
Dispatching method, comprises the following steps:
101, base station obtains buffer status information and the QoS parameter of each Business Stream；
102, according to status information and the parameter of above-mentioned acquisition, it is judged that descending industry waiting for transmission
Whether business stream is re-transmission, the most then perform step 105, if it is not, then perform step 103；
103, according to status information and the parameter of above-mentioned acquisition, it is judged that descending industry waiting for transmission
Whether business stream is VoIP class business, the most then perform step 104, if it is not, then perform step
Rapid 106；
104, perform the dispatching algorithm under semi-persistent scheduling mechanism, then terminate this scheduling；
105, determine whether resources left, the most then perform step 106, if it is not, then
Terminate this scheduling；
106, perform the dispatching algorithm under dynamic dispatching mechanism, and Resources allocation, then terminate
This scheduling.
Further, described step 101 includes following sub-step:
201, base station receives cycle or the CQI of non-periodic feedback of unique user；
202, base station dispatcher reads each Business Stream of above-mentioned user in current transmission time interval
Average transmission rate before.
Further, described step 102 includes following sub-step:
203, for real time business, the speed of each Business Stream waiting for transmission of above-mentioned user is calculated
Rate compensating factor；For non-real-time service, do not calculate the rate compensation factor；
204, according to the CQI of above-mentioned user feedback, average transmission rate and/
Or the rate compensation factor, calculate each Business Stream waiting for transmission of above-mentioned user at each Resource Block
Priority factors；
205, the institute before repetition is in steps, until all Business Streams obtaining all users exist
Priority factors on each Resource Block in Transmission Time Interval；
206, all Business Streams waiting for transmission are sorted the most from high to low, the industry of re-transmission
Business flow priority is the highest；
207, judge whether descending Business Stream waiting for transmission attaches most importance to according to the sequence of above-mentioned priority
Passing, if then performing step 105, otherwise performing step 103.
Further, described step 106 includes following sub-step:
208, the dispatching algorithm under dynamic dispatching mechanism is performed；
209, from traffic stream queues waiting for transmission, delete scheduled Business Stream, refresh to be passed
Defeated traffic stream queues；
210, judge whether Business Stream waiting for transmission, the most then re-execute step 207,
Otherwise terminate this scheduling.
Further, described step 104 includes following sub-step:
301, judge whether semi-persistent scheduling mechanism is activated, the most then perform step 302,
Otherwise perform step 304；
302, the resource that preferential configuration is retained；
303, when configuration parameter needs to change, terminate semi-persistent scheduling mechanism activation, then tie
Shu Benci dispatches；
304, indicate according to the dispatch of wireless heterogeneous networks, upload at fixing Resource Block
Defeated VoIP class business, and recording dispatching parameter；
305, activate semi-persistent scheduling mechanism, then terminate this scheduling.
Further, in described step 203, the formula of computation rate compensating factor is:
Wherein, GBRiFor the guarantee bit rate of i-th business,For above-mentioned steps 202
Described in average transmission rate, k is the identity of described unique user.
Further, in described step 204, calculate each Business Stream waiting for transmission of above-mentioned user
Formula in the priority factors of Resource Block is:
Wherein, CQI is CQI, and θ is configurable weight factor, and μ is can
The priority factors adjusted, δiIt is the parameter relevant to service quality；It is time delay fraction,
Wherein, Dk,iT () is the receptible maximum delay of user, Tk,iFor delay threshold.
The invention has the beneficial effects as follows: the present invention utilizes semi-persistent scheduling mechanism and dynamic dispatching machine
System combines, and has both considered the service quality problem of real time business, has taken into account again non-real-time service
Handling capacity, saving signaling resource, take full advantage of limited resources to reach preferably to dispatch effect
Really.Additionally, under dynamic dispatching mechanism, the improvement to existing algorithm can guarantee real time business
Simplify on the premise of guaranteeing bit rate and calculate, and realize surplus resources is carried out secondary distribution.
Accompanying drawing explanation
Fig. 1 is the flow chart of steps of the inventive method；
Fig. 2 is the flow chart of steps of dynamic dispatching mechanism in the inventive method；
Fig. 3 is the flow chart of steps of semi-persistent scheduling mechanism in the inventive method.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described further:
With reference to Fig. 1, in a kind of LTE system dynamically with semi-static combined scheduling method, including with
Lower step:
101, base station obtains buffer status information and the QoS parameter of each Business Stream；
It is designated as t) supposing that base station side is for unlimited buffering in each current transmission time interval TTI(
District's size, the status information of acquisition relief area, base station and the qos parameter of each Business Stream；
102, according to status information and the parameter of above-mentioned acquisition, it is judged that descending industry waiting for transmission
Whether business stream is re-transmission, the most then perform step 105, if it is not, then perform step 103；
In this step, concrete implementation mode is: scheduler is by checking HARQ management entity
Instruction has known whether re-transmission.
103, according to status information and the parameter of above-mentioned acquisition, it is judged that descending industry waiting for transmission
Whether business stream is VoIP class business, the most then perform step 104, if it is not, then perform step
Rapid 106；
104, perform the dispatching algorithm under semi-persistent scheduling mechanism, then terminate this scheduling；
105, determine whether resources left, the most then perform step 106, if it is not, then
Terminate this scheduling；
106, perform the dispatching algorithm under dynamic dispatching mechanism, and Resources allocation, then terminate
This scheduling.
The priority level initializing of each Business Stream: the Business Stream of re-transmission has limit priority, and uses
Dynamic dispatching mechanism；In new business, VoIP class business uses semi-persistent scheduling mechanism, other
Business uses dynamic dispatching mechanism.In dynamic dispatching mechanism, according to the most still non-real-time service
It is respectively adopted different dispatching priority computing formula and carries out prioritization, then give priority
The highest traffic flow assignment Radio Resource.
With reference to Fig. 2, being further used as preferred embodiment, described step 101 includes following
Sub-step:
201, base station receives the cycle of unique user k or the channel quality instruction of non-periodic feedback
Symbol CQI；
CQI is above-mentioned buffer status information, and buffer status information also includes base station in addition
The qos parameter etc. of each Business Stream waiting for transmission in relief area, side；
202, base station dispatcher reads each Business Stream of above-mentioned user k between current transmission time
Average transmission rate before TTI
If current time is t Transmission Time Interval TTI, the most each Business Stream is when current transmission
Between be spaced the average transmission rate before TTI and beIt is each Business Stream
QoS parameter.
With reference to Fig. 2, being further used as preferred embodiment, described step 102 includes following
Sub-step:
203, for real time business, each Business Stream waiting for transmission of above-mentioned user k is calculated
Rate compensation factor ρk,i(t)；For non-real-time service, do not calculate the rate compensation factor；
204, according to channel quality indicator CQI, the average transmission speed of above-mentioned user k feedback
RateAnd/or rate compensation factor ρk,i(t), calculate above-mentioned user waiting for transmission each
Business Stream is in priority factors P of each Resource Blockk,i；
205, the institute before repetition is in steps, until all Business Streams obtaining all users exist
Priority factors P on each Resource Block in Transmission Time Interval TTIk,i；
206, all Business Streams waiting for transmission are sorted the most from high to low, the industry of re-transmission
Business flow priority is the highest；
207, judge whether descending Business Stream waiting for transmission attaches most importance to according to the sequence of above-mentioned priority
Passing, if then performing step 105, otherwise performing step 103.
With reference to Fig. 2, being further used as preferred embodiment, described step 106 includes following
Sub-step:
208, the dispatching algorithm under dynamic dispatching mechanism is performed；
209, from traffic stream queues waiting for transmission, delete scheduled Business Stream, refresh to be passed
Defeated traffic stream queues；
210, judge whether Business Stream waiting for transmission, the most then re-execute step 207,
Otherwise terminate this scheduling.
After this finishing scheduling, the result of scheduling will be stored in DCI format, PDCCH believe
Road is transferred to user.And the Business Stream dispatched by PDSCH transmission to user.
With reference to Fig. 3, being further used as preferred embodiment, described step 104 includes following
Sub-step:
301, judge whether semi-persistent scheduling mechanism is activated, the most then perform step 302,
Otherwise perform step 304；
302, the resource that preferential configuration is retained；
303, when configuration parameter needs to change, terminate semi-persistent scheduling mechanism activation, then tie
Shu Benci dispatches；
304, CQI is indicated, in fixing money according to the dispatch of radio resource control RRC
Source block transmitting VoIP class business, and recording dispatching parameter；
305, activate semi-persistent scheduling mechanism, then terminate this scheduling.
Be further used as preferred embodiment, in described step 203, computation rate compensate because of
The formula of son is:
Wherein, GBRiFor the guarantee bit rate GBR of i-th business,For above-mentioned steps
Average transmission rate described in 202, k is the identity of described unique user.
WhenTime, show that the Mean Speed of user k is not up to business GBRiWant
Asking, now the weight factor of user k will obtain the compensation of exponential form.And for having reached industry
The user that the user of business GBR requirement and Non-GBR require, the value of compensating factor is 1,
So be ensure that the GBR requirement of customer service by restriction and indemnifying measure, can support
LTE mixed service scene.
It is further used as preferred embodiment, in described step 204, calculates above-mentioned user k
Each Business Stream waiting for transmission in priority factors P of Resource Blockk,iFormula be:
Wherein, CQI is CQI, and θ is configurable weight factor, Ke Yiquan
Fairness between weighing apparatus user and the resource utilization of system.System-level through repeatedly LTE-Sim
After emulation, determining best results when θ takes 2, μ is adjustable priority factors, δiIt is and clothes
The parameter that business quality is relevant；It is time delay fraction, wherein, Dk,iT () is that user is receptible
Maximum delay, Tk,iFor delay threshold.
μ is the biggest, and the priority of non-real-time service is the highest, and handling capacity is the biggest, but is as μ
Increase, the average packet time delay of real time business can be caused to increase, thus add packet loss can
Can property.
It is above the preferably enforcement of the present invention is illustrated, but the invention is not
Being limited to described embodiment, those of ordinary skill in the art are in the premise without prejudice to spirit of the present invention
Can also make down all equivalents or replacement, deformation or the replacement of these equivalents all comprise
In the application claim limited range.
Claims (5)
1. in a LTE system dynamically with semi-static combined scheduling method, it is characterised in that: comprise the following steps:
101, base station obtains buffer status information and the QoS parameter of each Business Stream；
102, according to status information and the parameter of above-mentioned acquisition, it is judged that whether descending Business Stream waiting for transmission is re-transmission, the most then step 105 is performed, if it is not, then perform step 103；
103, according to status information and the parameter of above-mentioned acquisition, it is judged that whether descending Business Stream waiting for transmission is VoIP class business, the most then step 104 is performed, if it is not, then perform step 106；
104, perform the dispatching algorithm under semi-persistent scheduling mechanism, then terminate this scheduling；
105, determine whether resources left, the most then perform step 106, if it is not, then terminate this scheduling；
106, perform the dispatching algorithm under dynamic dispatching mechanism, and Resources allocation, then terminate this scheduling；
Described step 101 includes following sub-step:
201, base station receives cycle or the CQI of non-periodic feedback of unique user；
202, base station dispatcher reads each Business Stream of above-mentioned user average transmission rate before current transmission time interval；
Described step 102 includes following sub-step:
203, for real time business, the rate compensation factor of each Business Stream waiting for transmission of above-mentioned user is calculated；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, each the Business Stream waiting for transmission priority factors at each Resource Block of above-mentioned user is calculated；
205, the institute before repetition is in steps, until obtaining all Business Streams priority factors on each Resource Block in Transmission Time Interval of all users；
206, being sorted the most from high to low by all Business Streams waiting for transmission, the Business Stream priority of re-transmission is the highest；
207, judging whether descending Business Stream waiting for transmission is re-transmission according to the sequence of above-mentioned priority, if then performing step 105, otherwise performing step 103.
In a kind of LTE system the most according to claim 1 dynamically with semi-static combined scheduling method, it is characterised in that: described step 106 includes following sub-step:
208, the dispatching algorithm under dynamic dispatching mechanism is performed；
209, from traffic stream queues waiting for transmission, delete scheduled Business Stream, refresh traffic stream queues waiting for transmission；
210, judge whether traffic stream queues waiting for transmission exists Business Stream waiting for transmission, the most then re-execute step 207, otherwise terminate this scheduling.
In a kind of LTE system the most according to claim 1 dynamically with semi-static combined scheduling method, it is characterised in that: described step 104 includes following sub-step:
301, judge whether semi-persistent scheduling mechanism is activated, the most then perform step 302, otherwise perform step 304；
302, the resource that preferential configuration is retained；
303, when configuration parameter needs to change, terminate semi-persistent scheduling mechanism activation, then terminate this scheduling；
304, indicate according to the dispatch of wireless heterogeneous networks, in fixing Resource Block transmitting VoIP class business, and recording dispatching parameter；
305, activate semi-persistent scheduling mechanism, then terminate this scheduling.
Dynamic and semi-static combined scheduling method in a kind of LTE system the most according to claim 1, it is characterised in that: in described step 203, the formula of computation rate compensating factor is:
Wherein, GBRiFor the guarantee bit rate of i-th business,For the average transmission rate described in above-mentioned steps 202, k is the identity of described unique user.
Dynamic and semi-static combined scheduling method in a kind of LTE system the most according to claim 4, it is characterised in that: in described step 204, each Business Stream waiting for transmission calculating 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, δiIt is the parameter relevant to service quality；It is time delay fraction, wherein, Dk,iT () is the receptible maximum delay of user, Tk,iFor delay threshold.
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| CN103857054B (en) * | 2014-03-12 | 2017-06-20 | 天津大学 | Multiplexing and combined dispatch processing method in long evolving system MAC layer |
| CN104507173B (en) * | 2015-01-19 | 2019-05-14 | 中国人民解放军国防科学技术大学 | A kind of voice service ascending resource method for semi-persistently dispatching and device towards 3G/4G mobile communications network |
| 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 |
| CN104837205B (en) * | 2015-04-16 | 2019-03-08 | 长安大学 | A kind of bus or train route communication downlink radio resource allocation algorithm |
| 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 |
| CN106604404B (en) * | 2015-10-20 | 2020-07-17 | 大唐移动通信设备有限公司 | Service scheduling method and device |
| CN110139239B (en) * | 2018-02-09 | 2021-03-16 | 电信科学技术研究院有限公司 | Method and terminal for service transmission |
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