CN103096478B - A kind of for optimizing the method and apparatus that in PDCCH, CCE scheduling of resource is distributed - Google Patents

A kind of for optimizing the method and apparatus that in PDCCH, CCE scheduling of resource is distributed Download PDF

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CN103096478B
CN103096478B CN201110341897.0A CN201110341897A CN103096478B CN 103096478 B CN103096478 B CN 103096478B CN 201110341897 A CN201110341897 A CN 201110341897A CN 103096478 B CN103096478 B CN 103096478B
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cce resource
cce
subscriber equipment
resource
pdcch
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CN103096478A (en
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王见
赵伟娟
钱骁琍
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Nokia Shanghai Bell Co Ltd
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Alcatel Lucent Shanghai Bell Co Ltd
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Abstract

The invention provides a kind of for optimizing the method and apparatus that in PDCCH, CCE scheduling of resource is distributed.Wherein, base station is retrieved as the duplicate allocation mark of CCE resource in each candidate PDCCH of schedulable user equipment allocation; According to the search volume corresponding to current priority and set rank, according to the summation that the duplicate allocation of CCE resource collection marks, give corresponding subscriber equipment by described CCE resource collection dispatching distribution.Compared with prior art, the present invention is by carrying out preliminary making to the CCE resource in PDCCH, again by down link and up link integrally, dynamic assignment is carried out, to improve utilance and the systematic function of CCE resource in PDCCH to the CCE resource in the PDCCH of system is unified.

Description

A kind of for optimizing the method and apparatus that in PDCCH, CCE scheduling of resource is distributed
Technical field
The present invention relates to wireless communication technology field, particularly relating to a kind of for optimizing the technology that in PDCCH, CCE scheduling of resource is distributed.
Background technology
Long Term Evolution (LTE, LongTermEvolution) is a transition between 3G and 4G technology.Wherein, LTE technology defines physical downlink control channel (PDCCH, PhysicalDownlinkControlChannel), it is by control channel unit (CCE, ControlChannelElement) form, for bearing downlink control information (DCI, DownlinkControlInformation).CCE is the minimum unit to the corresponding control channel resource of each user equipment allocation.CCE Resourse Distribute in PDCCH and PDSCH (PhysicalDownlinkSharedChannel, physical down link sharing channel) in PRB (PhysicalResourceBlock, Physical Resource Block) scheduling be the major function that the layer 2 (MAC layer) of base station is dispatched.
Can contribute to improving gulping down of whole system for effective distribution of CCE resource in PDCCH to measure and performance.Existing allocation algorithm focuses mostly on the static allocation of in PDCCH CCE resource, namely a CCE allocation table is preset, and CCE resource is divided into downlink portion and uplink portion, the scheduler of down link or the scheduler of up link can only distribute the CCE resource belonging to part separately respectively.Therefore, in PDCCH, CCE resource is not used effectively and optimizes, and in addition, this also have impact on the performance of whole system simultaneously.
Summary of the invention
The object of this invention is to provide for optimizing the method and apparatus that in PDCCH, CCE scheduling of resource is distributed.
According to an aspect of the present invention, provide a kind of for optimizing the method that in PDCCH, CCE scheduling of resource is distributed, the method comprises:
A is retrieved as the duplicate allocation mark of CCE resource in each candidate PDCCH of schedulable user equipment allocation;
Described CCE resource collection dispatching distribution, according to current corresponding search volume and set rank, according to the summation that the duplicate allocation of CCE resource collection marks, is given corresponding subscriber equipment by b.
According to another aspect of the present invention, additionally provide a kind of for optimizing the base station that in PDCCH, CCE scheduling of resource is distributed, this base station comprises:
Duplicate allocation labelling apparatus, for be retrieved as schedulable user equipment allocation each candidate PDCCH in the duplicate allocation mark of CCE resource;
Dynamic assignment device, for according to the search volume corresponding to current priority and set rank, according to the summation that the duplicate allocation of CCE resource collection marks, gives corresponding subscriber equipment by described CCE resource collection dispatching distribution.
Compared with prior art, the present invention is by carrying out preliminary making to the CCE resource in PDCCH, again by down link and up link integrally, dynamic assignment is carried out, to improve utilance and the systematic function of the CCE resource in PDCCH to the CCE resource in the PDCCH of system is unified.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 illustrates the method flow diagram for optimizing CCE dispatching distribution in PDCCH according to one aspect of the invention;
Fig. 2 illustrates the equipment schematic diagram for optimizing CCE dispatching distribution in PDCCH according to one aspect of the invention.
In accompanying drawing, same or analogous Reference numeral represents same or analogous parts.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 is the method flow diagram according to one aspect of the invention, illustrates for optimizing the process that in PDCCH, CCE scheduling of resource is distributed.Wherein, in step S101, base station is retrieved as the duplicate allocation mark of CCE resource in each candidate PDCCH of schedulable user equipment allocation; In step s 102, described CCE resource collection dispatching distribution, according to current corresponding search volume and set rank, according to the summation that the duplicate allocation of CCE resource collection marks, is given corresponding subscriber equipment by base station.
In the present invention, base station presets the starting point of the PDCCH dispatching distribution for whole system, and this starting point represents that the startup of the whole dispatching distribution operation of the CCE resource of PDCCH can not be later than this time point.
At this, in order to the schedulable user device list of down link and the schedulable user device list of up link be considered as a whole, the input of interval scan as PDCCH dispatching distribution is carried out to the schedulable subscriber equipment in two lists respectively in base station.Preferably, base station does not need the priority considering down link or up link.
According to LTE protocol, base station is search volume and the set rank that each schedulable subscriber equipment sets preferential CCE resource, and determines candidate's number M of PDCCH according to the search volume of described prioritizing selection and set rank (L).Wherein, in PDCCH, the search volume of CCE resource comprises public search space and specific search volume, and set rank comprises 1,2,4,8.At this, the transmission mode of base station based on down link or the schedule information type of institute's scheduling user's set, determine first search space and the set rank of the CCE resource corresponding to institute's scheduling user's set.
In step S101, the CCE resource occupy of set corresponding to rank L is determined by following formula:
Wherein, i=0 ..., L-1, M (L)for PDCCH candidate number, m=0 ..., M (L)-1;
For public search space, variable Y k=0; For the specific search volume on the CCE resource collection level L that subscriber equipment is corresponding variable Y k is defined as:
Y k＝(A·Y k-1)modD，
Wherein, Y -1=n rNTI≠ 0, A=39827, D=65537, n sit is time slot (slot) sequence number in a radio frames.
Base station, according to the corresponding relation of CCE resource in schedulable subscriber equipment and candidate PDCCH, marks corresponding CCE resource, and obtains the duplicate allocation mark of each CCE resource according to final mark.
At this, described duplicate allocation is designated as gain, and is initialized as 0.When CCE resource CceNo and can call subscriber equipment corresponding time, be designated as gain (CceNo)=gain (CceNo)+1; Iterative computation, in final candidate PDCCH, the duplicate allocation mark of each CCE resource calculates complete.
Subsequently, in step s 102, described CCE resource collection dispatching distribution, according to corresponding search volume and set rank, according to the summation that the duplicate allocation of CCE resource collection marks, is given corresponding subscriber equipment by base station.
Particularly, base station, according to the search volume of CCE resource and other priority of set tier, calculates the summation of duplicate allocation mark to the CCE resource collection corresponding to each priority, CCE resource collection minimum for summation is distributed to corresponding subscriber equipment.
Base station, according to other priority of the set tier of CCE resource, from limit priority, calculates duplicate allocation mark summation to each the CCE resource collection in candidate PDCCH, following formula can be adopted to calculate:
sgain ( m ) = Σ i = 0 L - 1 gain ( CceNo ( i ) ) ,
Subsequently, as candidate PDCCHm 0unoccupied and sgain ( m 0 ) = min m = 0 , . . . , M ( L ) ( sgain ( m ) ) , By candidate PDCCHm 0in CCE resource collection distribute to corresponding subscriber equipment; Otherwise, jump to the set rank of the CCE resource of next priority, repeat the computational process of step S102, to call subscriber equipment dynamic dispatching CCE resource to current.
When there is no the set rank of available CCE resource, again calling for current the search volume that next priority determined by subscriber equipment, and re-executing step S102.
When not having available search volume, then this is the current operation failure calling user equipment allocation CCE resource, waits for the process of allocation schedule next time of whole system.
Fig. 2 is equipment schematic diagram according to a further aspect of the invention, illustrates for optimizing the base station that in PDCCH, CCE scheduling of resource is distributed.Wherein, this base station comprises duplicate allocation labelling apparatus 211 and dynamic assignment device 212.Particularly, duplicate allocation labelling apparatus 211 is retrieved as the duplicate allocation mark of CCE resource in each candidate PDCCH of schedulable user equipment allocation; Described CCE resource collection dispatching distribution, according to current corresponding search volume and set rank, according to the summation that the duplicate allocation of CCE resource collection marks, is given corresponding subscriber equipment by dynamic assignment device 212.
In the present invention, base station presets the starting point of the PDCCH dispatching distribution for whole system, and this starting point represents that the startup of the whole dispatching distribution operation of the CCE resource of PDCCH can not be later than this time point.
At this, in order to the schedulable user device list of down link and the schedulable user device list of up link be considered as a whole, the input of interval scan as PDCCH dispatching distribution is carried out to the schedulable subscriber equipment in two lists respectively in base station.Preferably, base station does not need the priority considering down link or up link.
According to LTE protocol, base station is search volume and the set rank that each schedulable subscriber equipment sets preferential CCE resource, and determines candidate's number M of PDCCH according to the search volume of described prioritizing selection and set rank (L).Wherein, in PDCCH, the search volume of CCE resource comprises public search space and specific search volume, and set rank comprises 1,2,4,8.At this, the transmission mode of base station based on down link or the schedule information type of institute's scheduling user's set, determine first search space and the set rank of the CCE resource corresponding to institute's scheduling user's set.
The CCE resource occupy of set corresponding to rank L is determined by following formula:
Wherein, i=0 ..., L-1, M (L)for PDCCH candidate number, m=0 ..., M (L)-1;
For public search space, variable Y k=0; For the specific search volume on the CCE resource collection level L that subscriber equipment is corresponding variable Y kbe defined as:
Y k＝(A·Y k-1)modD，
Wherein, Y -1=n rNTI≠ 0, A=39827, D=65537, n sit is time slot (slot) sequence number in a radio frames.
Duplicate allocation labelling apparatus 211, according to the corresponding relation of CCE resource in schedulable subscriber equipment and candidate PDCCH, marks corresponding CCE resource, and obtains the duplicate allocation mark of each CCE resource according to final mark.
At this, described duplicate allocation is designated as gain, and is initialized as 0.When CCE resource CceNo and can call subscriber equipment corresponding time, be designated as gain (CceNo)=gain (CceNo)+1; Iterative computation, in final candidate PDCCH, the duplicate allocation mark of each CCE resource calculates complete.
Subsequently, described CCE resource collection dispatching distribution, according to corresponding search volume and set rank, according to the summation that the duplicate allocation of CCE resource collection marks, is given corresponding subscriber equipment by dynamic assignment device 212.
Particularly, dynamic assignment device 212 is according to the search volume of CCE resource and other priority of set tier, CCE resource collection corresponding to each priority is calculated to the summation of duplicate allocation mark, CCE resource collection minimum for summation is distributed to corresponding subscriber equipment.
Dynamic assignment device 212, according to other priority of the set tier of CCE resource, from limit priority, calculates duplicate allocation mark summation to each the CCE resource collection in candidate PDCCH, following formula can be adopted to calculate:
sgain ( m ) = Σ i = 0 L - 1 gain ( CceNo ( i ) ) ,
Subsequently, as candidate PDCCHm 0unoccupied and sgain ( m 0 ) = min m = 0 , . . . , M ( L ) ( sgain ( m ) ) , Dynamic assignment device 212 is by candidate PDCCHm 0in CCE resource collection distribute to corresponding subscriber equipment; Otherwise dynamic assignment device 212 is adjusted to the set rank of the CCE resource of next priority, repeats above-mentioned dynamic allocation procedure, to call subscriber equipment dynamic dispatching CCE resource to current.
When there is no the set rank of available CCE resource, dynamic assignment device 212 calls for current the search volume that next priority determined by subscriber equipment again, and repeat above-mentioned dynamic allocation procedure, with to this current adjustable subscriber equipment dynamic dispatching CCE resource.
When not having available search volume, then dynamic assignment device 212 judges that this is the current operation failure calling user equipment allocation CCE resource, waits for the process of allocation schedule next time of whole system.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.Any Reference numeral in claim should be considered as the claim involved by limiting.In addition, obviously " comprising " one word do not get rid of other unit or step, odd number does not get rid of plural number.Multiple unit of stating in system claims or device also can be realized by software or hardware by a unit or device.First, second word such as grade is used for representing title, and does not represent any specific order.

Claims (10)

1., for optimizing the method that in PDCCH, CCE scheduling of resource is distributed, the method comprises:
The corresponding relation of CCE resource in each candidate PDCCH that a is assigned with it according to each schedulable subscriber equipment, determines the duplicate allocation mark of CCE resource in each candidate PDCCH of described each schedulable subscriber equipment;
B is according to the search volume of CCE resource and other priority of set tier, based on the search volume corresponding to each priority and set rank, the summation of the duplicate allocation mark of the CCE resource collection corresponding to respective priority, gives corresponding subscriber equipment by described CCE resource collection dispatching distribution.
2. method according to claim 1, wherein, is designated as gain by described duplicate allocation, and is initialized as 0;
Wherein, described step a comprises:
A1, when CCE resource CceNo is corresponding with a schedulable subscriber equipment, is designated as gain (CceNo)=gain (CceNo)+1;
A2 iteration performs step a1, until the duplicate allocation mark of all CCE resources calculates complete.
3. method according to claim 1 and 2, wherein, described step b comprises:
-according to the search volume of CCE resource and other priority of set tier, from limit priority, corresponding CCE resource collection is calculated to the summation of duplicate allocation mark;
-CCE resource collection minimum for summation is distributed to corresponding subscriber equipment.
4. method according to claim 3, wherein, the method also comprises:
-when there is no available CCE resource, again for the set rank of next priority selected by current schedulable subscriber equipment;
-when there is no the set rank of available CCE resource, again for the search volume of next priority determined by current schedulable subscriber equipment, and re-execute described step b.
5. method according to claim 4, wherein, the method also comprises:
-when there is no available search volume, then this is the operation failure of current schedulable user equipment allocation CCE resource, waits for the process of allocation schedule next time of whole system.
6., for optimizing the base station that in PDCCH, CCE scheduling of resource is distributed, this base station comprises:
Duplicate allocation labelling apparatus, for the corresponding relation of CCE resource in each candidate PDCCH of being assigned with it according to each schedulable subscriber equipment, determines the duplicate allocation mark of CCE resource in each candidate PDCCH of described each schedulable subscriber equipment;
Dynamic assignment device, for according to the search volume of CCE resource and other priority of set tier, based on the search volume corresponding to each priority and set rank, the summation of the duplicate allocation mark of the CCE resource collection corresponding to respective priority, gives corresponding subscriber equipment by described CCE resource collection dispatching distribution.
7. base station according to claim 6, is designated as gain by described duplicate allocation, and is initialized as 0;
Wherein, described duplicate allocation labelling apparatus is used for:
-when CCE resource CceNo is corresponding with a schedulable subscriber equipment, be designated as gain (CceNo)=gain (CceNo)+1;
-iteration performs aforesaid operations, until the duplicate allocation mark of all CCE resources calculates complete.
8. the base station according to claim 6 or 7, wherein, described dynamic assignment device is used for:
-according to the search volume of CCE resource and other priority of set tier, from limit priority, corresponding CCE resource collection is calculated to the summation of duplicate allocation mark;
-CCE resource collection minimum for summation is distributed to corresponding subscriber equipment.
9. base station according to claim 8, wherein, described dynamic assignment device also for:
-when there is no available CCE resource, again for the set rank of next priority selected by current schedulable subscriber equipment;
-when there is no the set rank of available CCE resource, again for the search volume of next priority determined by current schedulable subscriber equipment, this current schedulable dispatching user facility of retry behavior of laying equal stress on distributes the operation of CCE resource.
10. base station according to claim 9, wherein, described dynamic assignment device also for:
-when there is no available search volume, then judge that this is the operation failure of current schedulable user equipment allocation CCE resource, wait for the process of allocation schedule next time of whole system.
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