CN104519581B - A kind of user scheduling method in communication system - Google Patents
A kind of user scheduling method in communication system Download PDFInfo
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- CN104519581B CN104519581B CN201310446661.2A CN201310446661A CN104519581B CN 104519581 B CN104519581 B CN 104519581B CN 201310446661 A CN201310446661 A CN 201310446661A CN 104519581 B CN104519581 B CN 104519581B
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Abstract
This application discloses the user scheduling method in a kind of communication system, including：It determines the CCE aggregation levels that scheduled user uses, user's scheduling is carried out according to CCE aggregation levels；Wherein, the CCE aggregation levels of SPS transmission services are set as 0；For scheduled downlink user, according to the sequence of CCE aggregation levels from high to low, preferentially it is scheduled in the subframe for only carrying out descending scheduling.Using the application, PDCCH resource can be made full use of, improves system performance.
Description
Technical field
This application involves wireless communication technique, the user scheduling method in more particularly to a kind of communication system.
Background technology
In existing communication system, PDCCH channels realize user's tune for carrying uplink and downlink control information using the channel
Degree.In order to which the running time-frequency resource of PDCCH and other down control channels is more effectively configured, LTE defines two dedicated controls
Channel resource unit：RE groups (RE Group, REG) and control channel unit (Control Channel Element, CCE).Its
In, a CCE is made of 9 REG.It, can be by N number of CCE according to the difference of resource requirement when carrying out PDCCH resource distribution
It is allocated for unit, wherein, N represents the aggregation levels of CCE.In current communication system, the aggregation levels of CCE are divided into 1,
2nd, 4 and 8.
In a communications system, PDCCH resource is very limited, particularly evident in small bandwidth.Such as in two transmitting antennas two
In the case of root reception antenna (2T2R), when system bandwidth is 1.4M, only 6 CCE can be used；When system bandwidth is 3M,
CCE at most also only has 12 CCE can be used.When being used in conjunction with CCE there are uplink and downlink, the resource of CCE is more nervous.
At present when carrying out resource allocation on PDCCH, by CCE public spaces（For carrying group message, system message etc.
PDCCH）Maximum is limited to 16 CCE, and the aggregation levels of public space CCE are 4 or 8；Meanwhile the maximum of uplink and downlink CCE
Ratio is adjusted to 1:2, it is adjusted in the service condition according to CCE.When carrying out user's scheduling, calculated according to QoS preferential
The random sequence that grade or semi-static business arrive is scheduled.Specifically, the semi-static activation of speech business is to carry out at random
, as long as current transmission time interval（TTI）Semi-persistent resource it is enough, the semi-static business under current TTI will be activated.Its
Remaining PS business is entirely the priority calculated according to QoS, is scheduled according to priority, is not considered used in the business
CCE situations.
However QoS is calculated and Random Activation SPS's as a result, will lead to following situation in being dispatched according to above-mentioned user：One
A TTI aggregation is entirely the low user of CCE aggregation levels or is the speech business for not needing to CCE entirely；And another TTI is concentrated
Be the high user of CCE aggregation levels entirely；So as to cause a TTI due to not needing to CCE or only needing a small amount of CCE, and
It is idle to there is CCE, another TTI can not be dispatched since CCE is insufficient（In small bandwidth, the scheduling time foot of single TTI
Enough, the number of users that each TTI can be dispatched depends primarily on radio resource）.
Have at the same time in the subframe that uplink and downlink is dispatched, limited CCE is used in conjunction with for uplink and downlink, since descending scheduling is upper
Before row scheduling, it will the situation that downlink user seizes uplink user CCE occur, lead to uplink user due to lacking CCE and nothing
Method carries out uplink scheduling or leaves the CCE of uplink scheduling for can not the higher user of dispatching uplink CCE aggregation levels.Extremely
In the case of, the high user of uplink CCE aggregation levels can not will dispatch for a long time, cause the waste of ascending idle port resource with
The QoS of the high uplink user of CCE aggregation levels can not be guaranteed.
From the foregoing, it can be seen that in existing dispatching method, in fact it could happen that the CCE of system fails fully to use, but in scheduling
The deficiency of CCE is presented, influences system performance.
Invention content
The application provides the user scheduling method in a kind of communication system, can make full use of the scheduling resource of PDCCH, carry
High system performance.
To achieve the above object, the application adopts the following technical scheme that：
A kind of user scheduling method in communication system, including：
It determines the CCE aggregation levels that scheduled user uses, user's scheduling is carried out according to CCE aggregation levels；
Wherein, the CCE aggregation levels of SPS transmission services are set as 0；For scheduled downlink user, assemble according to CCE
The sequence of rank from high to low is preferentially scheduled in the subframe for only carrying out descending scheduling.
Preferably, the user for using public CCE spaces, is preferentially adjusted in the subframe for only carrying out descending scheduling
Degree；
For the downlink user in special CCE spaces, according to the sequence of CCE aggregation levels from high to low, preferentially only carrying out
It is scheduled in the subframe of descending scheduling；
Preferably, after the resource allocation in the subframe for only carrying out descending scheduling is complete, it is low for remaining CCE aggregation levels
In the scheduled downlink user of given threshold, preferentially centralized dispatching is carried out in the same subframe for carrying out uplink and downlink scheduling.
Preferably, after the resource allocation in the subframe for only carrying out descending scheduling is complete, for remaining CCE aggregation levels not
Less than the scheduled downlink user of given threshold, according to different aggregation levels, under the premise of uplink residue CCE is retained,
The subframe for being carried out at the same time uplink and downlink scheduling is scheduled.
Preferably, for scheduled uplink user, according to the sequence of CCE aggregation levels from high to low, preferentially concentrating
It dispatches and is scheduled in subframe of the remaining CCE aggregation levels less than the scheduled downlink user of given threshold.
Preferably, described preferentially carry out in the subframe of scheduled downlink user for being less than given threshold described in centralized dispatching
It is scheduling to：Preferentially it is scheduled in the descending scheduling subframe of SPS business described in centralized dispatching.
Preferably, in the scheduled downlink user for being not less than given threshold described in scheduling, in the progress uplink and downlink tune
In the subframe of degree, according to the CCE aggregation levels of scheduled uplink user, the CCE resources of uplink scheduled user are reserved.
Preferably, the activation for uplink SPS business, preferentially described scheduled not less than given threshold for dispatching
It is scheduled in the subframe of the uplink and downlink scheduling of downlink user.
As seen from the above technical solution, in the application, the CCE aggregation levels that scheduled user uses is determined, are being used
It is further carried out when family is dispatched according to CCE aggregation levels；Wherein, the CCE aggregation levels of SPS transmission services are set as 0；For quilt
The downlink user of scheduling according to the sequence of CCE aggregation levels from high to low, preferentially carries out in the subframe for only carrying out descending scheduling
Scheduling.The user's scheduling carried out through the above way, considers the CCE aggregation levels of user, rationally carries out PDCCH resource distribution,
The downlink user for making CCE aggregation levels higher is scheduled in the subframe for only carrying out descending scheduling, on the one hand makes these as possible
Downlink user has CCE resources as much as possible that can use, and the downlink user on the other hand making these CCE aggregation levels high is as possible
The sub-frame resources for being carried out at the same time uplink and downlink scheduling are occupied less, and the uplink user for making CCE aggregation levels high there are more CCE resources
It can use, so as to avoid as possible on the one hand, CCE resources are under utilized, it is insufficient that CCE is on the other hand presented again in scheduling
Problem makes full use of the scheduling resource of PDCCH, improves system performance.
Specific embodiment
In order to which the purpose of the application, technological means and advantage is more clearly understood, the application is done below in conjunction with attached drawing
It is further described.
In small bandwidth system, the CCE sums of single TTI inherently very little, and each TTI can only use this TTI's
CCE.If reducing the CCE aggregation levels of scheduling user, the problem of CCE can not make full use of can be improved to a certain extent,
But the coverage area that will influence cell in this way；And if promoting the CCE aggregation levels of scheduling user, it may cause to eat dishes without rice or wine to provide
Source can not make full use of.
In the application, to make full use of CCE resources, while the coverage area of cell is not influenced, when carrying out user's scheduling,
Scheduled user is classified by the aggregation levels of its used CCE, it is corresponding poly- by being dispatched in specific subframe
Collect the user of rank, reach and fully use the CCE of system, and make full use of the purpose of interface-free resources, while ensure cell
Coverage area.
Most basicly, the dispatching method of the application includes：When carrying out user's scheduling, determine each scheduled user's
CCE aggregation levels carry out CCE resource allocations according to the aggregation levels and user dispatch.Wherein, due to the SPS industry activated
Business is not needed to using CCE, therefore the CCE aggregation levels of SPS transmission services are set as 0.Meanwhile scheduled downlink is used
Family according to the sequence of CCE aggregation levels from high to low, is preferentially scheduled in the subframe for only carrying out descending scheduling.Here,
The scheduling subframe of PDCCH is divided into two classes, and one kind is only used for carrying out descending scheduling, another kind of to be used to carry out uplink and downlink scheduling.
The scheduling carried out in the application is carried out according to CCE aggregation levels, meanwhile, the reference factor of other dispatching priorities can also rise
Effect, such as QoS grades of PS business, here " according to the sequence of CCE aggregation levels from high to low, preferentially in the case where only carrying out
It is scheduled in the subframe of row scheduling " can be the CCE aggregation grades under the premise of the reference factor for considering other dispatching priorities
It is not higher, more preferentially it is scheduled in the subframe for only carrying out descending scheduling, and be not that stringent limitation gathers fully according to CCE
Collect the height of rank, be scheduled the selection of subframe.For example, descending scheduling user A and aggregation grade for CCE aggregation levels 8
Other 4 descending scheduling user B, it is assumed that QoS of the QoS priority of user B higher than user A or the tune for first carrying out user B
Degree, and for it CCE resources are preferentially chosen in the subframe for only carrying out descending scheduling.
By the basic skills in above-mentioned the application, the downlink user that CCE aggregation levels can be allowed high, it is preferential using only into
CCE resources in the subframe of row descending scheduling ensure that the high user of these CCE aggregation levels will not be due to CCE not as much as possible
It can not be dispatched enough, and occupy the subframe for being carried out at the same time uplink and downlink scheduling as few as possible, be reserved for uplink scheduling user
Sufficient CCE resources are scheduled.
In descending scheduling, it is understood that there may be point-to-point traffic scheduling, it is also possible to group or system there are point-to-multipoint
The scheduling of message etc..Wherein, for carrying out the CCE that the CCE of point-to-point traffic scheduling is known as private space, for carrying out a little pair
The CCE of the scheduling such as the system message of multiple spot is known as the CCE of public space.During scheduling, the CCE user of public space first dispatches, so
CCE user's scheduling of private space is carried out afterwards；Downlink user is first dispatched, and is dispatched after uplink user.
When carrying out descending scheduling, " according to the sequence of CCE aggregation levels from high to low, preferentially descending scheduling is only being carried out
It is scheduled in subframe " it can specifically be implemented as described below：
1st, public space CCE user（Group or system message etc.）CCE aggregation levels it is higher（CCE as defined at present
Aggregation levels are 4 or 8）, therefore, for public space CCE user, according to its sequence of CCE aggregation levels from high to low, preferentially
It is scheduled in the subframe for only carrying out descending scheduling；In view of cell coverage area, the transmission power of public space CCE user
It can also increase.
2nd, for the downlink user in special CCE spaces, according to the sequence of CCE aggregation levels from high to low, preferentially only into
It is scheduled in the subframe of row descending scheduling；If the CCE resources only carried out in the subframe of descending scheduling have been assigned,
Remaining scheduled user carries out being scheduled in the subframe of ascending-descending subframes scheduling at the same time.
3rd, after the sub-frame resources for only carrying out descending scheduling are assigned, for remaining scheduled downlink user, by CCE
Aggregation levels preferentially carry out centralized dispatching less than the user of given threshold in the same subframe for carrying out uplink and downlink scheduling；Namely
It says, for the relatively low user of this kind of CCE aggregation levels, is concentrated on identical subframe and be scheduled, main purpose is uplink
There is also remote subscriber, CCE aggregation levels may also be higher, and the user for concentrating progress CCE aggregation levels relatively low is collected
Middle scheduling, so as to reserve sufficient CCE for distal end uplink user.When wherein given threshold is 1, that is, SPS business will be transmitted
User preferentially carry out centralized dispatching in the same subframe for carrying out uplink and downlink scheduling, so as to by all CCE resources of corresponding subframe
Keep for uplink scheduling user.
4th, after the sub-frame resources for only carrying out descending scheduling are assigned, for remaining scheduled downlink user, by CCE
Aggregation levels are not less than the user of given threshold, and the subframe for being preferentially dispersed in different carry out uplink and downlink scheduling is scheduled.This
Sample makes the downlink user of the more CCE resources of occupancy, is not concentrated in the same subframe for carrying out uplink and downlink scheduling, is upper as possible
Row scheduling user reserves sufficient CCE resources；Specifically, the above-mentioned scheduled downlink user not less than given threshold is being dispatched
When, in scheduling subframe, according to the CCE aggregation levels of scheduled uplink user, reserve the CCE moneys of uplink scheduled user
Then source, the above-mentioned scheduled downlink user not less than given threshold is dispatched after reserved CCE resources.
After the scheduling for completing downlink user, the scheduling of uplink user is carried out.In the scheduling for carrying out uplink user, most base
Locally, the sequence according to the CCE aggregation levels of uplink scheduling user from high to low, preferentially in the most subframe of remaining CCE resources
On be scheduled.Here priority scheduling meaning as hereinbefore, that is, allows to consider the reference factor of other dispatching priorities,
The considerations of carrying out priority scheduling with reference to CCE aggregation levels under equal conditions is not that stringent limitation is true only in accordance with CCE aggregation levels
Determine deployment position.Specifically, " for uplink scheduling user, according to the sequence of CCE aggregation levels from high to low, preferentially in residue
It is scheduled in the most subframe of CCE resources " it can be implemented as described below：
5th, for scheduled uplink user, according to the sequence of CCE aggregation levels from high to low, preferentially before centralized dispatching
It states and is scheduled in the subframe less than the scheduled downlink user of given threshold, that is to say, that the preferentially scheduling sublayer described in 3
It is scheduled on frame；When given threshold is 1, the uplink user that is scheduled is according to CCE aggregation levels, preferentially in transmission SPS business
Uplink and downlink scheduling subframe on be scheduled.Uplink user so as to enable occupancy CCE resources more is few with occupying CCE resources
Downlink user be scheduled in same subframe, to make full use of CCE resources.
6th, for the activation of uplink SPS business, preferentially for dispatching the aforementioned scheduled downlink not less than given threshold
It is scheduled, that is, be preferentially scheduled in the scheduling subframe described in 4 in the subframe of the uplink and downlink scheduling of user.Its
In, since the CCE resources that the activation of uplink SPS business occupies are seldom, by its descending scheduling more with occupying CCE resources
User is scheduled in same subframe, to make full use of CCE resources.
Above-mentioned is the user scheduling method in the application.In the above-mentioned methods, the use dispatched by modulating each TTI
Family, the CCE resource allocations of each TTI of adjustment system, the system of reduction are dispatched identification caused by CCE, make full use of and eat dishes without rice or wine
Resource.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God and any modification, equivalent substitution, improvement and etc. within principle, done, should be included within the scope of protection of the invention.
Claims (8)
1. a kind of user scheduling method in communication system, which is characterized in that including：
It determines the CCE aggregation levels that scheduled user uses, user's scheduling is carried out according to CCE aggregation levels；
Wherein, the CCE aggregation levels of SPS transmission services are set as 0；For scheduled downlink user, according to CCE aggregation levels
Sequence from high to low is preferentially scheduled in the subframe for only carrying out descending scheduling.
2. according to the method described in claim 1, it is characterized in that, user for using public CCE spaces, preferentially only into
It is scheduled in the subframe of row descending scheduling；
For the downlink user in special CCE spaces, according to the sequence of CCE aggregation levels from high to low, preferentially downlink is only being carried out
It is scheduled in the subframe of scheduling.
3. according to the method described in claim 1, it is characterized in that, when the resource allocation in the subframe for only carrying out descending scheduling is complete
Afterwards, remaining CCE aggregation levels are less than with the scheduled downlink user of given threshold, preferentially in same progress uplink and downlink scheduling
Subframe carry out centralized dispatching.
4. the method according to claim 1 or 3, which is characterized in that when the resource point in the subframe for only carrying out descending scheduling
After complete, remaining CCE aggregation levels are not less than with the scheduled downlink user of given threshold, according to different aggregation grades
Not, under the premise of uplink residue CCE is retained, the subframe for carrying out uplink and downlink scheduling at the same time is scheduled, and be preferentially dispersed in
The subframe of different carry out uplink and downlink scheduling is scheduled.
5. according to the method described in claim 3, it is characterized in that, for scheduled uplink user, according to CCE aggregation levels
Sequence from high to low is preferentially used in CCE aggregation levels remaining described in centralized dispatching less than the scheduled downlink of given threshold
It is scheduled in the subframe at family.
6. according to the method described in claim 5, it is characterized in that, described be preferentially less than given threshold described in centralized dispatching
It is scheduling in the subframe of scheduled downlink user：Preferentially in the uplink and downlink scheduling subframe of SPS business described in centralized dispatching
It is scheduled.
7. according to the method described in claim 4, it is characterized in that, in the scheduling scheduled downlink for being not less than given threshold
During user, in the subframe for carrying out uplink and downlink scheduling, according to the CCE aggregation levels of scheduled uplink user, reserve
The CCE resources of row scheduled user.
8. according to the method described in claim 4, it is characterized in that, activation for uplink SPS business, preferentially for dispatching
It is scheduled in the subframe of the uplink and downlink scheduling of the scheduled downlink user not less than given threshold.
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| CN101895988A (en) * | 2009-05-22 | 2010-11-24 | 中兴通讯股份有限公司 | Control channel resource allocation method and device |
| CN101895936A (en) * | 2009-05-18 | 2010-11-24 | 中兴通讯股份有限公司 | Method and device for distributing control channel resources |
| CN102202407A (en) * | 2010-03-23 | 2011-09-28 | 电信科学技术研究院 | Method and equipment for distributing resource |
| CN102404862A (en) * | 2011-11-11 | 2012-04-04 | 武汉邮电科学研究院 | Method for PDCCH (Physical Downlink Control Channel) resource allocation in LTE (Long Term Evolution) system |
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| US9055578B2 (en) * | 2012-03-15 | 2015-06-09 | Futurewei Technologies, Inc. | Systems and methods for UE-specific search space and ePDCCH scrambling |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895936A (en) * | 2009-05-18 | 2010-11-24 | 中兴通讯股份有限公司 | Method and device for distributing control channel resources |
| CN101895988A (en) * | 2009-05-22 | 2010-11-24 | 中兴通讯股份有限公司 | Control channel resource allocation method and device |
| CN102202407A (en) * | 2010-03-23 | 2011-09-28 | 电信科学技术研究院 | Method and equipment for distributing resource |
| CN102404862A (en) * | 2011-11-11 | 2012-04-04 | 武汉邮电科学研究院 | Method for PDCCH (Physical Downlink Control Channel) resource allocation in LTE (Long Term Evolution) system |
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