CN106254053A - A kind of LTE A carrier aggregation composition carrier allocation method based on CQI - Google Patents
A kind of LTE A carrier aggregation composition carrier allocation method based on CQI Download PDFInfo
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- CN106254053A CN106254053A CN201610682992.XA CN201610682992A CN106254053A CN 106254053 A CN106254053 A CN 106254053A CN 201610682992 A CN201610682992 A CN 201610682992A CN 106254053 A CN106254053 A CN 106254053A
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- 230000002776 aggregation Effects 0.000 title claims abstract description 23
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- 239000000203 mixture Substances 0.000 title claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
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- 238000005516 engineering process Methods 0.000 description 4
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- 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
- H04L5/0057—Physical resource allocation for CQI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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Abstract
The present invention provides a kind of LTE A carrier aggregation composition carrier allocation method based on CQI, including: according to coupling loss CL of carrier wave, one-tenth sub-carrier CC is divided into main plot carrier wave PCC and secondary cell carrier wave SCC；2) the channel quality indicator (CQI) value of current each one-tenth sub-carrier CC is calculated；Effective Signal to Interference plus Noise Ratio is mapped directly into channel quality indicator (CQI)；The channel quality indicator (CQI) value calculated order from high to low being arranged, first accessed by one-tenth sub-carrier high for CQI value when there being user to be carried out data transmission, the one-tenth sub-carrier that the most preferential channel condition is good carries out data transmission.The present invention can improve the availability of frequency spectrum and throughput of system, and promotes the satisfaction of end user.
Description
Technical field
The present invention relates to moving communicating field, be specifically related to a kind of LTE-A carrier aggregation and become the distribution method of sub-carrier.
Background technology
LTE-A is the evolution version of long evolving system LTE, in order to meet the descending 1Gbit/s of LTE-A, up
The peak rate of 500Mbit/s, defines crucial new features, i.e. a carrier aggregation technology of LTE-A in 3GPP R10.By
Frequency spectrum resource in current global range has not had the Continuous Band of 100M for LTE-A, so carrier aggregation technology
It is exactly by multiple continuous or discrete carrier aggregation together, forms a broader frequency spectrum, wide bandwidth can not only be met
Demand, also can improve the utilization rate of fragment frequency spectrum, it is to avoid frequency spectrum waste.
Owing to having introduced carrier aggregation technology in LTE-A, the different module of corresponding system will make corresponding change,
Wherein scheduling of resource also and has before had obvious difference as the important module of communication.Existing about Resource Allocation Formula master
Having two kinds, one is that federated resource distributes JCS scheme, another kind of for independent resource distribution ICS scheme.Federated resource distribution is
The one-tenth sub-carrier CC of polymerization is regarded as a carrier wave, only carries out one-level scheduling of resource, and independent resource distribution is to have two-stage resource
Distribution, is respectively into sub-carrier CC level scheduling of resource and Resource Block RB level scheduling of resource, realizes resource distribution.
Become the scheduling of sub-carrier CC level to refer to according to allocation algorithm business packet to be assigned in corresponding carriers, become sub-carrier at present
CC level resource allocation algorithm major part is all based on load balancing, and traditional algorithm includes randomly choosing RS algorithm, circulation choosing
Select CS algorithm and minimum load LL algorithm etc..Traditional algorithm is all based on load balancing to improve systematic function, but business is born
The equilibrium carried is not sufficient to ensure that good systematic function.For the carrier aggregation between frequency band, due to the covering of each one-tenth sub-carrier
Difference makes at user option composition carrier number different, so not only wanting when system carries out into the distribution of sub-carrier CC level resource
Consider business load, it is also contemplated that the propagation characteristic of wireless channel.
Summary of the invention
It is an object of the invention to provide a kind of handling capacity that can improve community user, improve the LTE-of user satisfaction
A carrier aggregation composition carrier allocation method.Technical scheme is as follows:
A kind of LTE-A carrier aggregation composition carrier allocation method based on CQI, including the following aspects:
1) according to coupling loss CL of carrier wave, one-tenth sub-carrier CC is divided into main plot carrier wave PCC and secondary cell carrier wave SCC: make
For selecting the foundation of PCC, using one-tenth sub-carrier CC minimum for coupling loss CL as main plot carrier wave PCC；Afterwards according to user
The one-tenth sub-carrier CC number of big polymerization adds secondary cell carrier wave SCC；
2) calculating the channel quality indicator (CQI) value of current each one-tenth sub-carrier CC, method is:
1. effective Signal to Interference plus Noise Ratio SINR is calculatedeff:
Wherein i is the number that user uses into the subcarrier on sub-carrier,
SINRiFor the Signal to Interference plus Noise Ratio on subcarrier i, β is scale factor, and L is the composition carrier number of polymerization；
2. by effective Signal to Interference plus Noise Ratio SINReffBeing mapped directly into channel quality indicator (CQI), corresponding formula is:
Wherein i is effective Signal to Interference plus Noise Ratio SINReffNumber,Represent i-th effective Signal to Interference plus Noise Ratio SINReffValue,Represent is i-th channel quality indicator (CQI) value；
3) the channel quality indicator (CQI) value calculated order from high to low is arranged, to count when there being user
First being accessed by one-tenth sub-carrier high for CQI value during according to transmission, the one-tenth sub-carrier that the most preferential channel condition is good carries out data transmission.
Compared with prior art, coupling loss and channel quality are indicated combination to reflect current component carrier wave CC by the present invention
Channel quality, and preferentially one-tenth sub-carrier good for channel condition is carried out data transmission.The present invention can improve the availability of frequency spectrum
And throughput of system, and improve the satisfaction of end user.
Accompanying drawing explanation
Fig. 1 .LTE-A carrier aggregation schematic diagram.
Fig. 2 .LTE-A system carrier aggregation resource allocation flow figure.
Independent resource distribution method schematic diagram under Fig. 3 .LTE-A system carrier aggregation.
Fig. 4. the general flow chart of present invention composition based on channel quality indicator (CQI) carrier allocation method.
Detailed description of the invention
The present invention is a kind of LTE-A carrier aggregation composition carrier allocation method based on channel quality indicator (CQI), mainly thinks
Wanting that the channel quality in view of heterogeneity carrier wave is different, research finds, channel condition is the best, and the modulating-coding exponent number of system is just
The highest, the exponent number of modulating-coding is the highest, and the handling capacity of system is the biggest, to this end, propose component carrier distribution side based on CQI
Method.When user data transmission, one-tenth sub-carrier higher for prioritizing selection CQI, it is achieved the data transmission of two-forty, improves system
Performance.
Understandable for making the purpose of the present invention, technical method and advantage become apparent from, enter with concrete steps below in conjunction with the accompanying drawings
One step describes the present invention in detail.
Fig. 1 is LTE-A carrier aggregation schematic diagram.Wherein the bandwidth of system is formed by composition carrier aggregation, the most often
The individual one-tenth sub-carrier subcarrier with correspondence identical with single carrier, becomes sub-carrier that continuous print can be made can also to be discrete,
Continuous print is used to become sub-carrier in the present invention.
Fig. 2 is that lte-a system carrier aggregation resource distributes schematic diagram.Resource distribution can be divided into following process: money
The configuration of source scheduler, user to the selection of each one-tenth sub-carrier and each become the distribution of Resource Block on sub-carrier.Specifically include with
Lower step:
Step 201: determined the one-tenth sub-carrier CC of this community by carrier aggregation subdistrict practical situation；
Step 202: configure suitable resource to base station according to the resource allocation methods becoming sub-carrier and system to be used
Scheduler；
Step 203: wait that user initiates the request message of data access；
Step 204: base station considers the service condition of Radio Resource in wireless access network, according to selected CC distribution method
For allowing the customer service accessed distribution suitably to become sub-carrier；
Step 205: after customer service is assigned to special component carrier wave, base station is to the Resource Block on this one-tenth sub-carrier
It is allocated；
Step 206: base station is gathering from the data cell on heterogeneity carrier wave in its medium access control MAC layer
Close, carry out hybrid automatic repeat-request HARQ detection；
Step 207: configure the transmission parameters such as respective through-put power, modulation coding method on a physical layer；
Step 208: finally carry out independent data transmission on heterogeneity carrier wave CC.
Fig. 3 is independent resource distribution method schematic diagram under lte-a system carrier aggregation, and carrier aggregation dispatching algorithm can be divided
Dispatching with united carrier for Independent Carrier Wave scheduling, the present invention realizes on the basis of Independent Carrier Wave is dispatched, and Independent Carrier Wave is adjusted
Degree is the one of two-level scheduler, and the member that the first order first provides it to select to each user according to corresponding CC distribution method carries
Ripple, carries out the distribution of Resource Block in the second level, and Resource Scheduler then provides a user with according to corresponding resource scheduling algorithm can
With the Resource Block used.Said method comprising the steps of:
Step 301: system is configured with L (becoming the total number of sub-carrier in L expression system) individual Resource Scheduler to base station, often
Individual Resource Scheduler manages a resource become on sub-carrier；
Step 302: when data flow to reach base station, base station first according to become sub-carrier selection strategy be that this user selects properly
One-tenth sub-carrier；
Step 303: user data is kept in and is placed in this one-tenth sub-carrier in the buffer queue of user k；
Step 304: Resource Scheduler is the user data Resources allocation block being positioned on this one-tenth sub-carrier and carries out data biography
Defeated.
Fig. 4 is the general flow chart of present invention LTE-A based on CQI carrier aggregation composition carrier allocation method, described method
Comprise the following steps:
Step 401: the parameter of configuration system, initializes the information of system；
Step 402: to offer, system includes that safe input, Radio Link Detection, physical uplink control by becoming sub-carrier
Channel, in interior a series of functions, can be classified as main constituent according to the flow process of the function becoming sub-carrier to provide and correspondence thereof and carry
Ripple PCC, with auxiliary become sub-carrier SCC.In the present invention, coupling loss CL according to carrier wave is as selecting depending on of main constituent carrier wave PCC
According to, computing formula CL=PL+ANT+SHAD+PENTR, wherein PL is path loss；ANT is antenna gain；SHAD is that shade declines
Fall；PENTR is penetration loss.Using one-tenth sub-carrier minimum for the coupling loss calculated as main constituent carrier wave PCC, add auxiliary one-tenth
Sub-carrier SCC is based on the CC number of user's maximum polymerization；
Step 403: user to report after calculating the value of channel quality indicator (CQI), and the mode reported has multiple, this
Using UE in invention selects subband to report CQI, concrete step:
1) system bandwidth of user is divided into J portions of bandwidth (BP)；
2) in each portions of bandwidth BP, select optimal sub-band to report；
3) in user updates BP, the CQI of all subbands takes；
4) value that CQI value is optimal sub-band CQI reported of the one-tenth sub-carrier CC obtained；
Relating to the calculating of CQI in step 403, concrete calculation procedure is as follows:
(1) using EESM algorithm to obtain effective Signal to Interference plus Noise Ratio SINR value, the formula used during calculating is as follows:
SINRiFor the Signal to Interference plus Noise Ratio on each subcarrier.L is the composition carrier number of polymerization.β is scale factor, in difference
The value difference that modulation system is corresponding with under code rate, specific corresponding to relation is as shown in table 1.
Table 1 modulation and coding strategy MCS-β synopsis
| Modulation system | Code rate | β |
| QPSK | 1/3 | 1.49 |
| 1/2 | 1.57 | |
| 2/3 | 1.69 | |
| 3/4 | 1.69 | |
| 4/5 | 1.65 | |
| 16QAM | 1/3 | 3.36 |
| 1/2 | 4.56 | |
| 2/3 | 6.42 | |
| 3/4 | 7.33 | |
| 4/5 | 7.68 |
(2) method that the mapping from Signal to Interference plus Noise Ratio SINR to channel quality indicator (CQI) uses directly mapping, at AWGN
Under environment, in the case of the value of block error rate BLER is fixed as 0.1, by the simulation curve of system determine Signal to Interference plus Noise Ratio SINR and
The linear corresponding relation of channel quality indicator (CQI).Concrete formula is as follows:
WhereinRepresent the value of i-th Signal to Interference plus Noise Ratio SINR,Represent is the value of i-th CQI.
Step 404: the CQI value obtaining step 403 is ranked up from big to small；
Step 405: when there being user data to be accessed, first accesses the maximum one-tenth sub-carrier CC of CQI；
Step 406: the user data of this one-tenth sub-carrier CC will be assigned in step 405 according to corresponding resource scheduling algorithm
For its Resources allocation block and carry out data transmission.
Step 407: judge that this user the most also has data to be transmitted；
Step 408: if this user also has data to transmission, then call next one-tenth sub-carrier CC, in this use unallocated
The residual components carrier wave CC of the data at family selects the one-tenth sub-carrier CC Resources allocation that CQI value is maximum, repeats step 404；
Step 409: if this user does not has data to transmission, then call next user；
Step 410: judge that whether active user is that last to distribute the user of data resource；
Step 411: if it is not, then continue to repeat step 403；
Step 412: if last user, then terminate whole scheduling of resource process.
Claims (1)
1. a LTE-A carrier aggregation composition carrier allocation method based on CQI, including the following aspects
1) according to coupling loss CL of carrier wave, one-tenth sub-carrier CC is divided into main plot carrier wave PCC and secondary cell carrier wave SCC: as choosing
Select the foundation of PCC, using one-tenth sub-carrier CC minimum for coupling loss CL as main plot carrier wave PCC；Gather according to user's maximum afterwards
The one-tenth sub-carrier CC number closed adds secondary cell carrier wave SCC；
2) calculating the channel quality indicator (CQI) value of current each one-tenth sub-carrier CC, method is:
1. effective Signal to Interference plus Noise Ratio SINR is calculatedeff:=
Wherein i is the number that user uses into the subcarrier on sub-carrier,
SINRiFor the Signal to Interference plus Noise Ratio on subcarrier i, β is scale factor, and L is the composition carrier number of polymerization；
2. by effective Signal to Interference plus Noise Ratio SINReffBeing mapped directly into channel quality indicator (CQI), corresponding formula is:
Wherein i is effective Signal to Interference plus Noise Ratio SINReffNumber,Represent i-th effective Signal to Interference plus Noise Ratio SINReffValue,Table
Show is i-th channel quality indicator (CQI) value；
3) the channel quality indicator (CQI) value calculated order from high to low is arranged, when there being user's data to be carried out biography
First being accessed by one-tenth sub-carrier high for CQI value time defeated, the one-tenth sub-carrier that the most preferential channel condition is good carries out data transmission.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110446266A (en) * | 2019-09-11 | 2019-11-12 | 南京邮电大学 | A kind of component carrier selection method of WiFi carrier aggregation technology |
| CN111148249A (en) * | 2019-12-24 | 2020-05-12 | 深圳大学 | Network resource allocation method and device |
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| US20120076028A1 (en) * | 2010-09-29 | 2012-03-29 | Hyunsoo Ko | Method and apparatus for performing effective feedback in wireless communication system supporting multiple antennas |
| CN103874208A (en) * | 2012-12-14 | 2014-06-18 | 电信科学技术研究院 | Shared channel resource distribution method and equipment based on multi-carrier system |
| CN105392193A (en) * | 2010-08-10 | 2016-03-09 | 三星电子株式会社 | Method and apparatus for configuring power headroom information in mobile communication system |
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| CN101242664A (en) * | 2007-12-27 | 2008-08-13 | 华为技术有限公司 | A realization method and device for multi-carrier wave power share |
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| CN110446266A (en) * | 2019-09-11 | 2019-11-12 | 南京邮电大学 | A kind of component carrier selection method of WiFi carrier aggregation technology |
| CN111148249A (en) * | 2019-12-24 | 2020-05-12 | 深圳大学 | Network resource allocation method and device |
| CN111148249B (en) * | 2019-12-24 | 2023-04-07 | 深圳大学 | Network resource allocation method and device |
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