CN108156663A - A kind of method for improving control channel resource allocation in LTE - Google Patents
A kind of method for improving control channel resource allocation in LTE Download PDFInfo
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- CN108156663A CN108156663A CN201711418312.4A CN201711418312A CN108156663A CN 108156663 A CN108156663 A CN 108156663A CN 201711418312 A CN201711418312 A CN 201711418312A CN 108156663 A CN108156663 A CN 108156663A
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- control channel
- channel resource
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
Abstract
A kind of method for improving control channel resource allocation, comprises the steps of in LTE：Corresponding spectrum efficiency SE is extrapolated according to the channel quality indicator (CQI) that terminal UE is fed back, the control channel resource CCE situations issued is determined, is denoted as M；Using tube method, with M centers, certain control channel resource CCE is reduced, M L is denoted as, is denoted as lower limit；Increase certain control channel resource CCE, be denoted as M+H, be denoted as the upper limit；It is the control channel resource CCE ranges that terminal UE schedules control channels PDCCH is used to determine M L to M+H；The control channel PDCCH that the terminal UE is carried out using the control channel resource CCE after adjustment is dispatched.This method makes channel resource allocation more reasonable, and control channel PDCCH performances are improved.
Description
Technical field
The invention belongs to fields of communication technology, and in particular to a kind of side for improving control channel resource allocation in LTE system
Method.
Background technology
In the system of LTE, OFDM symbol number that control channel PDCCH is occupied in a subframe is by physics control
Control format instruction CFI defined in format indication channel PCFICH processed is determined.In the occupied sign resources of PDCCH, also
Include PCFICH, the contents such as physical mixed automatic re-transmission indicating channel PHICH, reference signal RS, their occupied resources
It is several to be to determine according to configuration.Control channel PDCCH carryings are Downlink Control Information DCI, include one or more terminal UEs
Resource allocation and other control information.Due to can believe simultaneously comprising multiple DCI in the transmission bandwidth of control channel PDCCH
Breath, in order to which the running time-frequency resource of control channel PDCCH and other down control channels is more effectively configured, LTE defines two specially
Control channel resource units：RE groups (RE Group, REG) and control channel resource CCE.1 REG is by being located at same OFDM
4 or 6 adjacent RE compositions on symbol, but wherein available RE numbers only have 4, are contained in the REG of 6 RE compositions
Two reference signals, and the occupied RE of reference signal RS cannot be used by the REG of control channel.One control channel resource
CCE is made of 9 REG.DCI information is in the different control channel resource CCE degree of polymerization (i.e. in 1/2/4/8 continuous control
Channel resource CCE) on transmit, occupied control channel resource CCE numbers depend on terminal UE residing for down channel ring
Border, for the good terminal UE of down channel environment, base station can distribute less control channel resource CCE, but downlink is believed
The poor terminal UE of road environment, base station, which may need to distribute more control channel resource CCE for it, just can guarantee its performance.
How the channel situation of terminal UE is accurately determined, reasonably using control channel resource CCE for ensureing control letter
The performance in road is highly important, simultaneously because the OFDM symbol that control channel can occupy is limited, different terminals UE reasonable employments
The control channel resource CCE degree of polymerization is for increasing terminal UE dispatcher meeting, reasonable disposition control in the case of identical dispatch terminal UE numbers
Channel occupancy symbolic number processed is also all significantly.It is also unreasonable there are channel resource allocation in the prior art, control letter
The shortcomings that road performance is not high.
Invention content
The technical problems to be solved by the invention are to overcome above-mentioned the deficiencies in the prior art, provide a kind of flexibility and can
By the method for improving control channel resource allocation a kind of in the high LTE of property.
Technical solution is made of following step used by solving above-mentioned technical problem：
1st, the channel quality indicator (CQI) fed back according to terminal UE extrapolates spectrum efficiency SE；Specially：According to agreement, look into
Table 1 obtains the corresponding spectrum efficiency SE of channel quality indicator (CQI), and spectrum efficiency SE is filtered, and is trembled with reducing to measure
The dynamic influence judged channel quality CQI.
The corresponding table (QPSK-64QAM) of 1 channel quality indicator (CQI) of table and spectrum efficiency SE
2nd, the control channel resource CCE for meeting control channel PDCCH performance requirements is determined according to spectrum efficiency SE, is denoted as M；
The corresponding control channel PDCCH index of wherein spectrum efficiency SE and specific CCE and power combination numerical value, such as 2 institute of table
Show.
The corresponding control channel PDCCH index of 2 spectrum efficiency SE of table
3rd, centered on M, increase H, obtain the CCE upper limits, be denoted as M+H；L is reduced, the lower limit of CCE is obtained, is denoted as M-L,
Based on experience value, value is relatively more reasonable for 2 by wherein H and L.
4th, according to the business feedback information of the terminal UE, the control channel resource used is adjusted in the range of M-L~M+H
CCE tracks the truth of channel.Specially：If being fed back to ACK/NACK according to business, information judges control channel
PDCCH has been normally received, dependable performance, then using step-length as 0.01, reduces the control channel resource CCE used at present, reduce CCE
Consumption；If business is fed back to DTX, information judges that control channel PDCCH is not normally received, then using step-length as 1, increases scheduling
Control channel resource CCE, ensure that control channel PDCCH is normally received.
5th, whether the control channel resource CCE after adjustment is judged less than control channel resource CCE range lower limit M-L, if low
In the lower limit, then it is scheduled with the lower limit；Otherwise, step 6 is carried out.
6th, whether the control channel resource CCE after adjustment is judged higher than control channel resource CCE range lower limit M+H, if high
In the upper limit, then it is scheduled with the upper limit；Otherwise, step 7 is carried out.
7th, control channel PDCCH scheduling is carried out with the control channel resource CCE after adjustment.
The control channel resource CCE of determining schedules control channels PDCCH in this approach, both can be quickly with upper signal channel
Situation of change, can also there are certain adaptive spaces when channel quality indicator (CQI) reports devious；Reliable
Adaptively reach certain balance on the optimum utilization of property and resource.This method makes channel resource allocation more reasonable, control
Channel performance increases substantially.
Description of the drawings
Fig. 1 is the flow chart that the present invention improves control channel resource allocation methods.
Specific embodiment
The present invention is described in more detail with reference to the accompanying drawings and examples, but the present invention is not limited to following implementations
Example.
Embodiment 1
If terminal UE is configured with periodic channel quality instruction, CQI is reported, and step is as follows：
1st, the channel quality indicator (CQI) index fed back according to terminal UE is 6, tables look-up 1, obtains the correspondence of spectrum efficiency SE
Be worth is 1.17.
2nd, it is 1.17 according to frequency efficiency SE, tables look-up 2, determines that it is 17 to issue control channel PDCCH indexes, i.e. M=17.
3rd, with M centers, lower limit M-L=15 is obtained, while obtains upper limit M+H=19.
4th, ACK/NACK the and DTX situations fed back according to terminal UE business adjust the control channel resource CCE of actual use
Situation.If only there is ACK and NACK in a length of 100 fed back statistics window, lower control channel resource CCE the degree of polymerization or
Power excursion；If occurring two DTX in feedback window, the degree of polymerization or power excursion of control channel resource CCE are improved；If
Only occur a DTX in feedback window, then keep the degree of polymerization of control channel resource CCE and power excursion constant.
5th, whether the PDCCH indexes after adjustment are judged less than thresholding 15, if less than this thresholding, using indexing 15, i.e.,
4CCE+2dB carries out control channel PDCCH scheduling；Otherwise, step 6 is carried out.
6th, whether the PDCCH indexes after adjustment are judged higher than thresholding 19, if higher than this thresholding, using indexing 19, i.e.,
8CCE+3dB carries out control channel PDCCH scheduling, otherwise, carries out step 7.
7th, the CCE and power found using the PDCCH indexes after adjustment carries out the control channel PDCCH tune of the terminal UE
Degree.
Embodiment 2
If terminal UE is configured with periodic channel quality instruction, CQI is reported, and step is as follows：
1st, the channel quality indicator (CQI) index fed back according to terminal UE is 3, tables look-up 1, obtains the correspondence of spectrum efficiency SE
Be worth is 0.37.
2nd, it is 0.37 according to frequency efficiency SE, tables look-up 2, determines that it is 19 to issue control channel PDCCH indexes, i.e. M=19.
3rd, with M centers, obtain lower limit M-L=17, while obtain upper limit M+H=21, due to 21 be more than largest index 19, because
This upper limit is still 19.
4th, ACK/NACK the and DTX situations fed back according to terminal UE business adjust the control channel resource CCE of actual use
Situation.If only there is ACK and NACK in a length of 100 fed back statistics window, lower control channel resource CCE the degree of polymerization or
Power excursion；If occurring two DTX in feedback window, the degree of polymerization or power excursion of control channel resource CCE are improved；If
Only occur a DTX in feedback window, then keep the degree of polymerization of control channel resource CCE and power excursion constant.
5th, whether the PDCCH indexes after adjustment are judged less than thresholding 17, if less than this thresholding, using indexing 17, i.e.,
8CCE+1dB carries out control channel PDCCH scheduling；Otherwise, step 6 is carried out.
6th, whether the PDCCH indexes after adjustment are judged higher than thresholding 19, if higher than this thresholding, using indexing 19, i.e.,
8CCE+3dB carries out control channel PDCCH scheduling, otherwise, carries out step 7.
7th, the CCE and power found using the PDCCH indexes after adjustment carries out the control channel PDCCH tune of the terminal UE
Degree.
Embodiment 3
If terminal UE is configured with periodic channel quality instruction, CQI is reported, and step is as follows：
1st, the channel quality indicator (CQI) index fed back according to terminal UE is 15, tables look-up 1, obtains pair of spectrum efficiency SE
Should be worth is 5.55.
2nd, it is 5.55 according to frequency efficiency SE, tables look-up 2, determines that it is 0 to issue control channel PDCCH indexes, i.e. M=0.
3rd, with M centers, lower limit M-L=-2 is obtained, is still 0 since -2 more than index range；Obtain upper limit M+ simultaneously
H=2.
4th, ACK/NACK the and DTX situations fed back according to terminal UE business adjust the control channel resource CCE of actual use
Situation.If only there is ACK and NACK in a length of 100 fed back statistics window, lower control channel resource CCE the degree of polymerization or
Power excursion；If occurring two DTX in feedback window, the degree of polymerization or power excursion of control channel resource CCE are improved；If
Only occur a DTX in feedback window, then keep the degree of polymerization of control channel resource CCE and power excursion constant.
5th, whether the PDCCH indexes after adjustment are judged less than thresholding 0, if less than this thresholding, using index 0, i.e. 1CCE-
7dB carries out control channel PDCCH scheduling；Otherwise, step 6 is carried out.
6th, whether the PDCCH indexes after adjustment are judged higher than thresholding 2, if higher than this thresholding, using index 2, i.e. 1CCE-
5dB carries out control channel PDCCH scheduling, otherwise, carries out step 7.
7th, the CCE and power found using the PDCCH indexes after adjustment carries out the control channel PDCCH tune of the terminal UE
Degree.
Claims (1)
- A kind of method for improving control channel resource allocation, comprises the steps of in 1.LTE：(1) channel quality indicator (CQI) fed back according to terminal UE extrapolates spectrum efficiency SE；(2) the control channel resource CCE for meeting control channel PDCCH performance requirements is determined according to spectrum efficiency SE, is denoted as M；(3) centered on M, increase H, obtain the CCE upper limits, be denoted as M+H；L is reduced, the lower limit of CCE is obtained, is denoted as M-L；(4) according to the business feedback information of the terminal UE, the control channel resource CCE used is adjusted in the range of M-L~M+H, The truth of channel is tracked, specially：If being fed back to ACK/NACK according to business, information judges control channel PDCCH It has been normally received that, dependable performance, then using step-length as 0.01, reduced the control channel resource CCE used at present, reduced CCE consumption； If business is fed back to DTX, information judges that control channel PDCCH is not normally received, then using step-length as 1, increases the control of scheduling Channel resource CCE processed ensures normally receiving for control channel PDCCH；(5) whether the control channel resource CCE after adjustment is judged less than control channel resource CCE range lower limit M-L, if less than should Lower limit is then scheduled with the lower limit；Otherwise, step (6) is carried out；(6) whether the control channel resource CCE after adjustment is judged higher than control channel resource CCE range lower limit M+H, if higher than should The upper limit is then scheduled with the upper limit；Otherwise, step (7) is carried out；(7) control channel PDCCH scheduling is carried out with the control channel resource CCE after adjustment.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111385899A (en) * | 2018-12-28 | 2020-07-07 | 中兴通讯股份有限公司 | Resource scheduling method and device, network equipment and readable storage medium |
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Application publication date: 20180612 |