CN103987089B - The channel quality index uploading method of ABS mechanism is not lined up - Google Patents
The channel quality index uploading method of ABS mechanism is not lined up Download PDFInfo
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- CN103987089B CN103987089B CN201410197032.5A CN201410197032A CN103987089B CN 103987089 B CN103987089 B CN 103987089B CN 201410197032 A CN201410197032 A CN 201410197032A CN 103987089 B CN103987089 B CN 103987089B
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Abstract
The invention discloses a kind of channel quality index uploading method for not lining up ABS mechanism, and first, user equipment obtains the ID of its most strong jamming cell, and reports its base station in service sector；Secondly, the ABS illustration case of most strong interferers cell described in base station in service sector acquisition, and the user equipment is sent to by RRC signaling；Afterwards, subframe is divided into two types, independent channel quality index uploading is respectively adopted and feeds back to base station in service sector, the MCS for base station in service sector is selected by user equipment according to the ABS illustration case of the most strong interferers cell configured；In addition, base station in service sector judges whether throughput performance is improved according to statistical result.The present invention effectively increases the degree of accuracy that base station is estimated UE down channels, so as to lifting system handling capacity.
Description
Technical field
The present invention relates to moving communicating field, more particularly to one kind to be applied to LTE-A (Long Term Evolution
Advanced, senior long term evolution) system for not lining up ABS (Almost Blank Subframe, almost blank subframe)
CQI (Channel Quality Identifier, channel quality instruction) report method of mechanism.
Background technology
In current LTE-A heterogeneous network scenes, there is serious grand small section interference.In order to reduce macro station to small
The annoyance level stood, it must just use necessary interference coordination technique.Generally, due to temporal correlation, eNB
(evolved Node B, evolved base station) thinks that UE channel quality does not change in a short time, so once
CQI reports the down channel estimation for being used in continuous several subframes, such as Fig. 1.
ABS mechanism is exactly a kind of time domain interference coordination technology, and it is sent out by limiting data of the macrocell in some subframes
Send the interference reduced to small station UE (User Equipment, user equipment).But after adding ABS mechanism, UE is in inhomogeneity
Channel quality in type subframe has obvious difference, and now UE is still reported using a set of CQI will cause serious channel estimation
Deviation, cause declining to a great extent for throughput of system.
Specifically, the introducing of ABS subframes can bring SINR (Signal tos of the UE in different subframes
Interference Noise Ratio, Signal to Interference plus Noise Ratio) differ larger, such as Fig. 2.Wherein Mcell1-3 (Macro cell, it is grand small
Area) in grid subframe represent ABS subframes, remaining is nonABS subframes.Assuming that this 3 macrocells are Pcell (Pico in figure
Cell, cell) three interference cell-of-origins, then the SINR of the first of Pcell subframe is more much higher than remaining subframe, now such as
Fruit UE just reports CQI, Pcell eNB to estimate 5 subframes next according to CQI now in this first subframe
Down channel quality, the consequence brought is apparent：Employ too high MCS (Modulation and Coding Scheme,
Modulation coding mode) this UE transmission data are given, BLER (Block Error Ratio, bLock error rate) is raised significantly, cause to count
Increase according to retransmission rate, so that throughput of system declines to a great extent；, whereas if gone to estimate ABS subframes with the CQI in common subframe
MCS used by transmission data, then can lose spectrum efficiency, and consequence is still the handling capacity for losing this UE.
Traditional ABS is static aligned type configuration, that is, when system initialization, all Mcell configure phase
Same ABS illustration case.The channel circumstance of UE in Pcell divide into two kinds by such collocation method：ABS subframes and nonABS subframes
(the ABS subframes in ABS subframe Zhi Linhong areas here, Pcell are configured without ABS illustration case in itself).It can be considered to by UE
The CQI of report is divided to for two sets：The nonABS_CQI of the ABS_CQI and nonABS subframes of ABS subframes.Such as Fig. 3, grid subframe uses
ABS_CQI, remaining subframe use nonABS_CQI.Different types of CQI is only used for corresponding subframe and carries out down channel
Quality is estimated.So service cell eNB just can accurately estimate two kinds of different channels, and this two sets of CQI report cycles are only mutually
It is vertical.For the UE in Mcell, CQI still only needs it is sufficient that a set of, because when adjacent area is ABS subframes, this cell
It is ABS subframes, does not send any UE data.
And using after not lining up ABS technologies, all Mcell can be adaptive to the disturbed condition of other cells according to oneself
Generate ABS subframes.If serious to other area interferences, two ABS subframes may be configured；If to other area interferences not
Seriously, an ABS subframe may be only configured not distribute even, and even if the same, the different Macro of ABS number of sub frames of distribution
The position of cell ABS subframes also not necessarily, such as Fig. 4.Therefore following two problems can be brought：
First, PUE (grand user equipment) is no longer able to find clear and definite two kinds of channel quality, as long as present sub-frame has
Lin Hong areas distribute ABS subframes, and the SINR of this subframe will be improved, but how many adjacent area is assigned with ABS in each subframe
Subframe is uncertain, therefore how many kind channel quality is also not necessarily on earth.
2nd, MUE (micro- user equipment) can not be reported only with a set of CQI, because different from the ABS illustration case of aligned type, when
Even if it is ABS subframes that, which there is adjacent area at the preceding moment, this cell is not necessarily ABS subframes, it is desired nonetheless to sends data.Therefore this
In the case of, as MUE with PUE is, also there is the subframe of a variety of channel qualities.
Due to the limitation of current termination function, each UE can not possibly accurately know the ABS illustration case of each interference adjacent area, from
And definite channel quality is classified；CQI is divided into too many set simultaneously and also has extra cost, can be made between UE and eNB
Signalling exchange becomes very frequently, to influence throughput of system.
The content of the invention
The present invention proposes a kind of CQI report methods for not lining up ABS mechanism applied to lte-a system, Ke Yigen
Subframe is divided into two types according to the UE actual situations that are disturbed, independent CQI is respectively adopted and reports, effectively improves base station under UE
The degree of accuracy of row channel estimation, so as to lifting system handling capacity.
The technical solution adopted by the present invention is as follows：A kind of channel quality index uploading method for not lining up ABS mechanism, bag
Include,
The first step, a user equipment obtain the ID of its most strong jamming cell, and report its base station in service sector；
Second step, the ABS illustration case of most strong interferers cell described in base station in service sector acquisition, and sent by RRC signaling
To the user equipment；
Subframe is divided into two species by the 3rd step, user equipment according to the ABS illustration case of the most strong interferers cell configured
Type, independent channel quality index uploading is respectively adopted and feeds back to base station in service sector, the MCS for base station in service sector is selected
Select；
Whether the 4th step, the current throughput performance of base station in service sector Statistic analysis are improved：If making moderate progress,
It is transferred to the first step；Otherwise channel quality index uploading mode is reduced.
Preferably, in the first step, user equipment periodically collects the RSRP in all Lin Hong areas, by being calculated
Most strong interferers macrocell.
Preferably, triggering switch decision event A3 when collecting the RSRP in Lin Hong areas, then collection process, which enters, forbids state, etc.
Restart collection process after the completion of to be switched.
Preferably, in the second step, base station in service sector first inquires about local data base with the presence or absence of this Target cell
ABS illustration case；If it is not, then sending ABS illustration case to this Target cell by X2 mouths obtains request, and the ABS illustration case received is deposited
It is placed on local data base.
In addition, in the first step, user equipment is by calculating the path loss in all Lin Hong areas and this cell or apart from judging
Most strong jamming cell.
Beneficial effect：In the case where ABS mechanism be present, ABS technologies are not lined up particularly, it is right that the present invention program passes through
The modification of CQI reporting schemes, the degree of accuracy that base station is estimated downstream data channel can be obviously improved, so as to greatly improve LTE-
A throughput of system.
Brief description of the drawings
Fig. 1 is the schematic diagram of known periodicity COI reporting schemes；
Fig. 2 is the channel quality condition schematic diagram of UE after introducing ABS mechanism；
Fig. 3 is the ABS distribution schematic diagrams of static aligned type configuration；
Fig. 4 is not line up ABS distribution schematic diagrams under ABS algorithms；
Fig. 5 is the heterogeneous network scene schematic diagram of the embodiment of the present invention；Fig. 6 is that two sets are used in ABS of the embodiment of the present invention
CQI reports the schematic diagram of mechanism.
Embodiment
In order to know more about the technology contents of the present invention, especially exemplified by specific embodiment and institute's accompanying drawings are coordinated to be described as follows.
The present invention proposes that a kind of simple realization, the less method of cost optimize the degree of accuracy that CQI is reported：Obtain most capable and experienced
The ABS illustration case of adjacent area is disturbed, on this basis, two sets of CQI is still divided into and reports.
That realizes this method focuses on how determining most strong interfered cell, small for the interference that how to determine most strong
Area, following two methods can be used：
Cell_specific：I.e. according to each Lin Hong areas and the path loss or distance of this cell, to judge to this area interference
Most Qiang Linhong areas.
UE_specific：I.e. each UE disturbed conditions according to suffered by respective, find out to its RSRP (Reference
Signal Receiving Power, Reference Signal Received Power) most Qiang Linhong areas, the interfered cell most strong as it.
Two ways has respective advantage and disadvantage.From the point of view of Signalling exchange amount, Cell_specific has obvious advantage,
Because the position of each cell is changeless, the most strong jamming cell of each cell just can be really in system initialization
It is fixed, and will not change again.The ABS illustration case in each most strong jamming Lin Hong areas is handed down to by each cell by measurement configuration information
Each UE, later UE are with regard to that can report two sets of CQI.And UE_specific method Signalling exchange is more frequent, because general feelings
UE is motion under condition, and each UE most strong interferers cell can constantly change over time, it is therefore desirable to periodically enter
Row config update.
But from the point of view of accurate angle, UE_specific method will have more advantage, such as Fig. 5, and cell Pico is arrived
Three adjacent macro cell eNB minimum range min (D)=D1, consider under path loss situation the same terms, Pico most strong jamming is adjacent
Area should be Macro1 in figure.Three eNB of UE1 distances distance is L1, L2 and L3 respectively in figure, and three eNB of UE1 distances
Minimum range min (L)=L3, i.e. UE1 most strong jamming adjacent area should select Macro3.Now, using Cell_specific and
The most strong jamming adjacent area that UE_specific is drawn is different, due to inherently one UE_specific of CQI information,
It is clear that the result that UE_specific methods find out most strong jamming cell is more accurate.
Once it is determined that most strong jamming cell, this cell base station Pico can just obtain its ABS illustration case by X2 mouths, then pass through
Transmitting signaling downwards are to UE by RRC (Radio Resource Control, radio resource control), as its measurement configuration information.
Hereafter UE can be just defined by this information marks off two sets of CQI and reports, and improves the precision of CQI feedback.
Specifically, the preferred embodiments of the invention comprise the following steps that：
The first step, a kind of new event type ABS_Event is defined, for determining that the most strong interferers of user equipment (UE) are adjacent
Hong Qu.This event is made decisions in the rrc layer of user equipment (UE) by cycle T, similar to switch decision event A3 (neighbor cell matter
Amount is better than serving cell, and difference exceedes appointed threshold), but the RSRP in only more all Lin Hong areas of ABS_Event.If this is surveyed
The RSRP in all Lin Hong areas of amount gained is not more than most strong interferers cell before, then event does not trigger；If this measurement is found
Most strong interferers cell before You Linhong areas RSRP is more than, then report serving cell by the most strong cell ID of wherein RSRP.Need
It is noted that if this user's A3 event has triggered, ABS_Event, which enters, forbids state, after waiting user's switching completion,
ABS_Event reenters available state.
Second step, after the eNB of serving cell receives the most strong interferers Lin Hong area ID from reported by user equipment UE, first look into
Ask the ABS illustration case that local data base whether there is this Target cell.If this data be present, directly sent out by RRC signaling
Give this UE；If local data base is not present, ABS illustration case is sent to this Target cell by X2 interface and obtains request, works as mesh
After Biao Hong areas receive this request, its ABS illustration case is just sent back into serving cell, this information is stored in local data by serving cell
Storehouse is simultaneously sent to this UE.
3rd step, after UE receives the ABS illustration case in most strong interferers Lin Hong areas, the CQI of script is reported and is divided into two sets, respectively
For ABS_CQI and nonABS_CQI, this two sets of CQI report cycles are independent mutually, and are only used for the letter of corresponding subframe type
Estimate in road.Two sets of CQI report cycles are configured when system initialization, respectively ABS_Period and nonABS_
Period, as shown in fig. 6, wherein grid subframe is PUE ABS subframes, i.e., this UE most strong interferers Hong Qu is in this subframe
ABS subframes, therefore SINR is higher.The CQI measured in this subframe, i.e. ABS_CQI, the eNB for being simply possible to use in serving cell exist
This UE ABS subframes carry out channel estimation when sending data.
4th step, after CQI modification mechanism is opened, the eNB of serving cell judges that throughput performance is according to statistical result
It is no to be improved.If making moderate progress, the first step is transferred to, UE continues to carry out ABS_Event judgements by cycle T；If not improving,
Even handling capacity becomes even worse, then all UE into cell, which send CQI and changed, forbids signaling, reduces CQI reporting schemes.
Although the present invention is disclosed above with preferred embodiment, so it is not limited to the present invention.Skill belonging to the present invention
Has usually intellectual in art field, without departing from the spirit and scope of the present invention, when can be used for a variety of modifications and variations.Cause
This, the scope of protection of the present invention is defined by those of the claims.
Claims (5)
1. a kind of channel quality index uploading method for not lining up ABS mechanism, the ABS that do not line up refers to all Mcell meetings
According to oneself disturbed condition adaptive generation ABS subframe to other cells；Including,
The first step, a user equipment obtain the ID of its most strong jamming cell, and report its base station in service sector；
Second step, the ABS illustration case of most strong interferers cell described in base station in service sector acquisition, and institute is sent to by RRC signaling
State user equipment；
3rd step, user equipment are divided into ABS subframes and non-according to the ABS illustration case of the most strong interferers cell configured, by subframe
ABS subframes, independent channel quality is respectively adopted and indicates periodically to report to feed back to base station in service sector, for serving cell
The MCS selections of base station；
4th step, base station in service sector judge whether current throughput performance is improved：If making moderate progress, first is transferred to
Step；Otherwise channel quality index uploading mode is reduced.
2. the channel quality index uploading method according to claim 1 for not lining up ABS mechanism, it is characterized in that, described
In one step, user equipment periodically collects the Reference Signal Received Power in all Lin Hong areas, by the way that most strong jamming is calculated
Source macrocell.
3. the channel quality index uploading method according to claim 2 for not lining up ABS mechanism, it is characterized in that, work as collection
During the RSRP in Lin Hong areas trigger switch decision event A3, then collect process enter forbids state, wait it is to be switched after the completion of restart
Collection process.
4. the channel quality index uploading method according to claim 1 for not lining up ABS mechanism, it is characterized in that, described
In one step, user equipment is by calculating the path loss in all Lin Hong areas and this cell or apart from judging most strong jamming cell.
5. the channel quality index uploading method according to claim 1 for not lining up ABS mechanism, it is characterized in that, described
In two steps, base station in service sector first inquires about the ABS illustration case that local data base whether there is this Target cell；If it is not, then pass through X2
Mouth sends ABS illustration case to this Target cell and obtains request, and the ABS illustration case received is stored in into local data base.
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| CN103262596A (en) * | 2011-08-05 | 2013-08-21 | 日电（中国）有限公司 | Method and apparatus for indicating downlink channel measurement and method and apparatus performing downlink channel measurement in a relaying system |
| CN103580784A (en) * | 2012-07-26 | 2014-02-12 | 中兴通讯股份有限公司 | Modulation mode and code rate selecting method based on channel quality indication and base station |
| CN103733587A (en) * | 2011-06-08 | 2014-04-16 | Lg电子株式会社 | Method and device for information transmission in wireless communication system |
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| CN103733587A (en) * | 2011-06-08 | 2014-04-16 | Lg电子株式会社 | Method and device for information transmission in wireless communication system |
| CN103262596A (en) * | 2011-08-05 | 2013-08-21 | 日电（中国）有限公司 | Method and apparatus for indicating downlink channel measurement and method and apparatus performing downlink channel measurement in a relaying system |
| CN103580784A (en) * | 2012-07-26 | 2014-02-12 | 中兴通讯股份有限公司 | Modulation mode and code rate selecting method based on channel quality indication and base station |
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