CN105471560A - PDCCH CCE aggregation level determining method - Google Patents
PDCCH CCE aggregation level determining method Download PDFInfo
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- CN105471560A CN105471560A CN201410452145.5A CN201410452145A CN105471560A CN 105471560 A CN105471560 A CN 105471560A CN 201410452145 A CN201410452145 A CN 201410452145A CN 105471560 A CN105471560 A CN 105471560A
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Abstract
The invention discloses a physical downlink control channel (PDCCH) control channel element (CCE) aggregation level determining method, which comprises the steps of: A, setting a correspondence table of CCE aggregation levels and downlink channel quality parameters; B, acquiring the downlink channel quality parameter of current user equipment; C, querying the correspondence table according to the downlink channel quality parameter of the current user equipment, and regarding the queried corresponding CCE aggregation level as the current CCE aggregation level. The invention further discloses a device for determining PDCCH CCE aggregation levels. By adopting the PDCCH CCE aggregation level determining method and the device, the PDCCH resource allocation of the user equipment can be more reasonable.
Description
Technical field
The application relates to mobile communication technology field, particularly relates to a kind of PDCCHCCE polymerization grade defining method.
Background technology
In LTE mobile communication system, Physical Downlink Control Channel (PDCCH, PhysicalDownlinkControlChannel) for bearing downlink control information (DCI, DownlinkControlInformation), shared by up-downgoing scheduling, mainly comprise dispatching distribution and other control informations.Subscriber equipment (UE, UserEquipment) obtains required DCI information by blind Detecting, after UE correctly receives PDCCH information, for decoding to Physical Downlink Shared Channel (PDSCH) information and obtain uplink authorization.The correctness of PDCCH decoding determines transmission rate.
Multiple PDCCH can be transmitted in a subframe simultaneously.A PDCCH is made up of n continuous print control channel unit (CCE, ControlChannelElement), and initial CCE index i must meet imodn=0 and the scope of i is [0, N
cCE, k-1], wherein N
cCE, kfor CCE numbers for PDCCH all in subframe k.Namely CCE number is the PDCCH of n, No. CCE of its original position, is necessary for the integral multiple of n.
PDCCH has 4 types (format), is respectively { 0,1,2,3}, respectively corresponding polymerization grade (AggregationLevel) { 1,2,4,8}.Polymerization grade represents the continuous print CCE number that a PDCCH takies, i.e. above-mentioned n.
PDCCH type is as shown in table 1:
Table 1
During scheduling, base station (eNodeB) can for each UE to be scheduled, the PDCCH resource that distribution one is available from PDCCH search space (SearchSpace), if can be assigned to just scheduling, otherwise does not just dispatch.
UE can at discontinuous reception (DRX, DiscontinuousReception) descending sub frame of the activationary time (ActiveTime) of pattern monitors PDCCHcandidates set, and decode according to monitored DCI format, this set is defined as again the search volume (SearchSpace) of this UE.In the convergence rank L ∈ { search volume on 1,2,4,8}
be defined as the set of PDCCHcandidates.
Search volume
the CCEs of middle PDCCHcandidatem is by following formulae discovery:
Wherein, i=0 ..., L-1 and m=0 ..., M
(L)-1.M
(L)for the PDCCHcandidate number of search volume, table look-up according to L and 2 to obtain:
Table 2
Search volume is divided into common (Common) space and UE special (UE-Specific) space, Common space is used for transmission and paging (Paging), accidental access response (RAResponse), Broadcast Control Channel (BCCH, BroadcastControlChannel) etc. relevant control information, UE-Specific space is used for the transmission control information relevant to DSCH Downlink Shared Channel (DL-SCH), Uplink Shared Channel (UL-SCH) etc.Common space is from CCE0; The original position in UE-Specific space can calculate (i=0) by the function provided above.
For common space, Y
kbe 0.
For UE-specific space
(convergence rank is L), Y
kbe defined as Y
k=(AY
k-1) modD.
Wherein, Y
-1=n
rNTI≠ 0, A=39827, D=65537, and
n
sit is the time slot (slot) number (value 0 ~ 19) in a frame.
For different users, down channel quality is different, and the CCE number required for PDCCH is also different, and downstream channel conditions is better, and the CCE number of needs is fewer.If distribute CCE inadequate resource, then directly can cause the decline of UE blind Detecting success rate, if the CCE quantity of distributing is too many, then can causes the waste of resource that resource utilization is declined, thus cause systematic function to decline.Therefore, the distribution carrying the CCE resource of DCI just seems most important.
In prior art, the relevant parameter configured by high level determines the OFDM (OFDM of PDCCH, OrthogonalFrequencyDivisionMultiplex) symbolic number, and the resource particle (RE mapped for carrying PDCCH is calculated according to this symbolic number, ResourceElement) number, come, for each PDCCH configures PDCCH form large as far as possible, namely to select polymerization grade large as far as possible finally by RE number.The advantage of this implementation method is easy to realize, and shortcoming is PDCCH resource unreasonable distribution.The required Resources allocation when channel condition is relatively good can be caused to lack, but reality is then assigned with more resource, causes the waste of resource; When channel condition is poor, need more resource to ensure the reliability transmitted, and when having multiple DCI format multiplexing, then the blocking rate of PDCCH can be caused to increase, cause the blind Detecting success rate of terminal to reduce.
Summary of the invention
This application provides a kind of PDCCHCCE polymerization grade defining method, the PDCCH resource of subscriber equipment can be made to distribute more reasonable.
A kind of PDCCHCCE polymerization grade defining method that the embodiment of the present application provides, comprising:
A, the mapping table of each CCE polymerization grade and down channel quality parameter is set;
The down channel quality parameter of B, acquisition current user equipment;
C, inquire about described mapping table according to subscriber equipment current downlink channel mass parameter, using the corresponding CCE polymerization grade that inquires as current C CE polymerization grade.
Preferably, described down channel quality parameter is that the down channel quality that UE reports indicates CQI, through the down channel quality parameter of Adaptive Modulation and Coding AMC adjustment or the Signal to Interference plus Noise Ratio SINR of down channel.
Preferably, comprise further after step C:
D, use current C CE polymerization grade search available CCE, judge whether to find available CCE position, if so, proceed to step G, otherwise perform step e;
E, judge whether current polymerization grade equals 8, if so, process ends, otherwise perform step F;
F, by current C CE polymerization grade elevated by one step, proceed to step D;
G, use current C CE polymerization grade carry out subsequent operation, process ends.
Preferably, described down channel quality parameter is the SINR of down channel;
Steps A comprises: when obtaining using different CCE polymerization grade by link simulation 1% the SINR threshold value required by the error rate, set up the mapping table of SINR and CCE polymerization grade accordingly.
The embodiment of the present application additionally provides a kind of device for determining PDCCHCCE polymerization grade, and this device is arranged in base station, comprising:
Corresponding relation module, for arranging the mapping table of each CCE polymerization grade and down channel quality parameter;
Channel quality acquisition module, for obtaining the down channel quality parameter of current user equipment;
CCE polymerization grade determination module, subscriber equipment current downlink channel mass parameter for obtaining according to channel quality acquisition module inquires about the mapping table arranged in described corresponding relation module, using the corresponding CCE polymerization grade that inquires as current C CE polymerization grade.
Preferably, described down channel quality parameter is that the down channel quality that UE reports indicates CQI, through the down channel quality parameter of Adaptive Modulation and Coding AMC adjustment or the Signal to Interference plus Noise Ratio SINR of down channel.
Preferably, this device comprises further:
First judge module, for using current C CE polymerization grade to search available CCE, judges whether to find available CCE position, and if so, this device exports current C CE polymerization grade, otherwise enable second judge module;
Second judge module, for judging whether current polymerization grade equals 8, if so, described device terminates the operation determining CCE polymerization grade; Otherwise, by current C CE polymerization grade L elevated by one step, notify that the first judge module performs its operation again.
Preferably, described down channel quality parameter is the SINR of down channel;
When described corresponding relation module obtains using different CCE polymerization grade by link simulation 1% the SINR threshold value required by the error rate, set up the mapping table of SINR and CCE polymerization grade accordingly.
As can be seen from the above technical solutions, relevant to the down channel quality of subscriber equipment according to the CCE polymerization grade that the application's scheme is determined, the PDCCH resource of subscriber equipment is distributed more reasonable, obtain on the basis of required PDCCH resource at each subscriber equipment of guarantee, maximize the success rate of the blind Detecting improving subscriber equipment as far as possible.
Accompanying drawing explanation
The PDCCHCCE polymerization grade defining method schematic flow sheet that Fig. 1 provides for the embodiment of the present application.
Embodiment
This application provides a kind of PDCCHCCE polymerization grade defining method, its design philosophy is: the mapping table pre-setting down channel quality parameter and CCE polymerization grade; Described mapping table is inquired about, using the corresponding CCE polymerization grade that inquires as current C CE polymerization grade according to subscriber equipment current downlink channel mass parameter.Further, if CCE position corresponding to current C CE polymerization grade is unoccupied, then current CCE polymerization grade is selected; Otherwise the CCE position that namely current C CE polymerization grade is corresponding is occupied, then current C CE polymerization grade elevated by one step is proceeded PDCCH resource and search until find available CCE position; Or polymerization grade reaches when being 8 to the maximum without available CCE position.
For making the know-why of technical scheme, feature and technique effect clearly, below in conjunction with specific embodiment, technical scheme is described in detail.
The PDCCHCCE polymerization grade defining method flow process that the embodiment of the present application provides as shown in Figure 1, comprises the steps:
Step 101: the mapping table that each CCE polymerization grade and down channel quality parameter are set.
The particular content of the application to described down channel quality parameter is not construed as limiting, it can be such as down channel quality instruction (CQI) that UE reports, also Adaptive Modulation and Coding (AMC can be through, AdaptiveModulationCoding) the down channel quality parameter adjusted, or the Signal to Interference plus Noise Ratio of down channel (SINR).Down channel quality parameter according to CQI or AMC adjustment obtains corresponding SINR by link simulation results, is described in following steps for SINR.When can obtain using different CCE polymerization grade by link simulation 1% the SINR threshold value required by the error rate, the mapping table of SINR and CCE polymerization grade can be set up accordingly.
Step 102: the down channel quality parameter obtaining current user equipment.
Step 103: determine CCE polymerization grade L according to down channel parameters.
The mapping table determination current C CE polymerization grade L of CCE polymerization grade and the Signal to Interference plus Noise Ratio threshold value pre-set is searched according to current downlink channel SINR value.
Step 104: use current polymerization grade L to search available CCE.
In conjunction with total CCE number, present sub-frame number, use the CCE polymerization grade L determined to utilize CCE position calculation formulae discovery CCE available position, search available CCE.
The process of searching available CCE is described below by way of false code:
Table look-up according to L and obtain the corresponding number M needing the candidate PDCCH detected
(L);
for(m＝0；m<M
(L)；m++)
{
Determine PDCCHCCE original position:
wherein N
cCE, kfor the number of the CCE that present sub-frame comprises; Y
kbe defined as Y
k=(AY
k-1) modD,
Wherein, Y
-1=n
rNTI≠ 0, A=39827, D=65537, and
n
sit is the time slot (slot) number (value 0 ~ 19) in a frame.
If current candidate PDCCH can use, and L CCE from original position is available
Then represent and find available CCE, break;
}
Step 105: judge whether to find available CCE position, if so, proceed to step 108, otherwise perform step 106.
Step 106: judge whether current polymerization grade L equals 8, if so, represent that all available positions are all occupied, do not have available CCE position, this subframe cannot be dispatched, process ends, otherwise performs step 107.
Step 107: by current C CE polymerization grade L elevated by one step, proceeds to step 104 and carries out new round PDCCH resource and search.
If current C CE polymerization grade L is 1, then elevated by one step becomes 2; If current C CE polymerization grade L is 2, then elevated by one step becomes 4; If current C CE polymerization grade L is 4, then elevated by one step becomes 8.
Step 108: use current C CE polymerization grade L to carry out subsequent operation, process ends.
The embodiment of the present application additionally provides a kind of device for determining PDCCHCCE polymerization grade, and this device is arranged in base station, comprising:
Corresponding relation module, for arranging the mapping table of each CCE polymerization grade and down channel quality parameter;
Channel quality acquisition module, for obtaining the down channel quality parameter of current user equipment;
CCE polymerization grade determination module, subscriber equipment current downlink channel mass parameter for obtaining according to channel quality acquisition module inquires about the mapping table arranged in described corresponding relation module, using the corresponding CCE polymerization grade that inquires as current C CE polymerization grade.
According to another embodiment of the application, described down channel quality parameter is that the down channel quality that UE reports indicates CQI, through the down channel quality parameter of Adaptive Modulation and Coding AMC adjustment or the Signal to Interference plus Noise Ratio SINR of down channel.
According to another embodiment of the application, this device comprises further:
First judge module, for using current C CE polymerization grade to search available CCE, judges whether to find available CCE position, and if so, this device exports current C CE polymerization grade, otherwise enable second judge module;
Second judge module, for judging whether current polymerization grade equals 8, if so, described device terminates the operation determining CCE polymerization grade; Otherwise, by current C CE polymerization grade L elevated by one step, notify that the first judge module performs its operation again.
According to another embodiment of the application, described down channel quality parameter is the SINR of down channel;
When described corresponding relation module obtains using different CCE polymerization grade by link simulation 1% the SINR threshold value required by the error rate, set up the mapping table of SINR and CCE polymerization grade accordingly.
The foregoing is only the preferred embodiment of the application; not in order to limit the protection range of the application; within all spirit in technical scheme and principle, any amendment made, equivalent replacements, improvement etc., all should be included within scope that the application protects.
Claims (8)
1. a physical downlink control channel PDCCH control channel unit CCE polymerization grade defining method, is characterized in that, comprising:
A, the mapping table of each CCE polymerization grade and down channel quality parameter is set;
The down channel quality parameter of B, acquisition current user equipment;
C, inquire about described mapping table according to subscriber equipment current downlink channel mass parameter, using the corresponding CCE polymerization grade that inquires as current C CE polymerization grade.
2. method according to claim 1, is characterized in that, described down channel quality parameter is that the down channel quality that UE reports indicates CQI, through the down channel quality parameter of Adaptive Modulation and Coding AMC adjustment or the Signal to Interference plus Noise Ratio SINR of down channel.
3. method according to claim 1, is characterized in that, comprises further after step C:
D, use current C CE polymerization grade search available CCE, judge whether to find available CCE position, if so, proceed to step G, otherwise perform step e;
E, judge whether current polymerization grade equals 8, if so, process ends, otherwise perform step F;
F, by current C CE polymerization grade elevated by one step, proceed to step D;
G, use current C CE polymerization grade carry out subsequent operation, process ends.
4. method according to claim 1, is characterized in that, described down channel quality parameter is the SINR of down channel;
Steps A comprises: when obtaining using different CCE polymerization grade by link simulation 1% the SINR threshold value required by the error rate, set up the mapping table of SINR and CCE polymerization grade accordingly.
5., for determining a device for physical downlink control channel PDCCH control channel unit CCE polymerization grade, it is characterized in that, this device is arranged in base station, comprising:
Corresponding relation module, for arranging the mapping table of each CCE polymerization grade and down channel quality parameter;
Channel quality acquisition module, for obtaining the down channel quality parameter of current user equipment;
CCE polymerization grade determination module, subscriber equipment current downlink channel mass parameter for obtaining according to channel quality acquisition module inquires about the mapping table arranged in described corresponding relation module, using the corresponding CCE polymerization grade that inquires as current C CE polymerization grade.
6. device according to claim 5, is characterized in that, described down channel quality parameter is that the down channel quality that UE reports indicates CQI, through the down channel quality parameter of Adaptive Modulation and Coding AMC adjustment or the Signal to Interference plus Noise Ratio SINR of down channel.
7. device according to claim 5, is characterized in that, this device comprises further:
First judge module, for using current C CE polymerization grade to search available CCE, judges whether to find available CCE position, and if so, this device exports current C CE polymerization grade, otherwise enable second judge module;
Second judge module, for judging whether current polymerization grade equals 8, if so, described device terminates the operation determining CCE polymerization grade; Otherwise, by current C CE polymerization grade L elevated by one step, notify that the first judge module performs its operation again.
8. device according to claim 5, is characterized in that, described down channel quality parameter is the SINR of down channel;
When described corresponding relation module obtains using different CCE polymerization grade by link simulation 1% the SINR threshold value required by the error rate, set up the mapping table of SINR and CCE polymerization grade accordingly.
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| CN107645356A (en) * | 2016-07-20 | 2018-01-30 | 普天信息技术有限公司 | PDCCH control channel unit polymerization grade determines method and apparatus |
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| CN114982158A (en) * | 2020-12-30 | 2022-08-30 | 北京小米移动软件有限公司 | Parameter determining method, parameter determining device and storage medium |
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Application publication date: 20160406 |