CN102804638B - Method for estimating channel state in a wireless communication system using fractional frequency reuse and mobile station using the same - Google Patents
Method for estimating channel state in a wireless communication system using fractional frequency reuse and mobile station using the same Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/06—Reselecting a communication resource in the serving access point
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- 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
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
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- H04L25/022—Channel estimation of frequency response
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Abstract
A method for estimating channel state in a wireless communication system and a mobile station using the same are disclosed. The method includes acquiring cell Identifiers (IDs) of a serving cell and one or more neighbor cells, acquiring information about preset power level patterns for one or more frequency partitions to which FFR is applied according to the cell IDs, and estimating a channel state of the serving cell based on the power level pattern information.
Description
Technical field
The present invention relates to wireless communication system, or rather, relating to a kind of method estimating channel status in wireless communication system using fractional frequency reuse (Fractional Frequency Reuse) (FFR).
Background technology
FFR is one of technology of the channel quantity that can increase each unit area in the cellular system.Typically, signal becomes more weak along with its propagation.This means can use identical frequency channels in the place of certain distance separated from one another or larger distance.According to this principle, can greatly increase subscriber's capacity by using same frequency in multiple position simultaneously.This effective frequency usage is called as channeling.
Community (or sector) is defined as the unit area geographically distinguished, and for continue ongoing communication carry out between cells frequency channels exchange be called as switching.Channeling is necessary for analog mobile cellular telecommunication.Frequency duplex factor as one is one of parameter representing frequency efficiency in the cellular system.In multi-cell environment, frequency duplex factor as one is by the value of the sum of the community (sector) that uses same frequency divided by community sum simultaneously.
(such as, advanced mobile phone service (AMPS) has the frequency duplex factor as one being less than 1 to the first generation (1G) system.Such as, be 1/7 at 7-cell frequency multiplex medium frequency multiplexing factor.Frequency duplex factor as one is higher in the second generation (2G) system (such as, code division multiple access (CDMA) and time division multiple access (TDMA)).Such as, the global system for mobile communications (GSM) that frequency division multiple access (FDMA) and TDMA combine is called oneself the frequency duplex factor as one reaching 1/4 or 1/3.2G CDMA or the third generation (3G) bandwidth CDMA (WCDMA) system can support be 1 frequency duplex factor as one, therefore increase spectrum frequently efficiency and reduce network design cost.
The frequency duplex factor as one of 1 can be embodied as when all sectors in community and all communities in network operate in same frequency channel.But, even if the system with the frequency duplex factor as one being 1 also may stand the throughput of difference at cell edge or sector-edge because of the severe jamming between neighbor cell, and therefore may in the face of service disruption.That is, because presence of intercell interference, so signal receiving performance for being poor the user of cell edge.
In OFDM (OFDMA), channel is divided into subchannel and sends signal on sub-channels.Different from 3G (CDMA2000 or WCDMA), Signal transmissions does not occupy whole channel.Utilize this feature, for the heart in the cell user and throughput can be increased the user of cell edge simultaneously.
Or rather, center of housing estate is from the region close to base station (BS), and this base station is not relatively by the impact of cochannel interference.Therefore, the user of the heart can operate on all available subchannels in the cell.On the other hand, only allow to operate in a part for all available subchannels the user of cell edge.With the edge of neighbor cell, the mode operated in the different sets of subchannel is carried out this part of allocated sub-channels.This is called as FFR.By whole subband being divided into orthogonally multiple frequency partition (Frequency Partition) (FP) and arranging FA to make each community not use a certain FA or to use a certain FA with low power level, the cochannel interference between neighbor cell can be alleviated.
Multiple-input and multiple-output (MIMO) has attracted a lot of attentiveness recently as wideband wireless mobile communication technology.Mimo system is sought by using multiple antenna to increase data communication efficiency.Send identical data or different pieces of information according to by antenna, MIMO technology is divided into spatial reuse and space diversity.
The feature of spatial reuse is, sends different pieces of information by multiple transmission (Tx) antenna simultaneously.Therefore, it is possible to send data when not increasing system bandwidth with two-forty.In space diversity, send identical data by multiple Tx antenna, therefore realize transmitting diversity.Space-time channel model coding is a kind of space diversity scheme.
According to receiver whether by feedback of channel information to transmitter, MIMO technology also can classify as open loop MIMO and closed-loop MIMO.(BLAST) and space-time grid coding (STTC) when open loop MIMO scheme comprises dblast.According to BLAST, transmitter transmitted in parallel information, and receiver detects detection signal by repetition ZF (ZF) or least mean-square error (MMSE).Therefore, it is possible to send the as many information of number with Tx antenna.STTC realizes transmitting diversity and coding gain by usage space.Transmit antenna array (TxAA) is closed-loop MIMO techniques.
In wireless channel environment, channel status changes brokenly in time and frequency, that is, decline is inevitable.Therefore, receiver uses channel information to correct the signal received, to recover the data of transmitter transmission, and detects correct data.Transmitter is sent to receiver, so that this receiver obtains channel information based on the distorted signals produced during the transmission by transmitter and the known signal of receiver.This signal is reference signal or pilot signal, and the process obtaining channel information is called as channel estimating.High power is utilized to send the reference signal not carrying data.If transmitted and receive data by multiple antenna, so receiver should understand the channel status between transmitting antenna and reception antenna.Therefore, reference signal is sent by each transmitting antenna.
Propose multipoint cooperative (CoMP), with the throughput by applying advanced MIMO to improve the user at cell edge under multi-cell environment.The use of CoMP in a wireless communication system can be increased in the communication performance of the MS of cell edge.For this purpose, need to perform channel estimating accurately based on the reference signal received from multiple BS.Associating Data support (joint data support) can be supplied to MS by CoMP operation by multiple cell BS.In addition, each BS is by supporting one or more MS, MS1, MS2 simultaneously ... MSK, can improve systematic function.In addition, BS can realize space division multiple access (SDMA) based on channel condition information between the bs and ms.
In CoMP wireless communication system, serving BS broadcasts and one or more neighbor bss, BS1, BS2 ... BSM is connected to scheduler by backbone network.Scheduler receives measured by BS, expression MS, MS1 to MSK and BS, BS1, BS2 ... the feedback channel information of the channel status between BSM.Such as, scheduler can dispatch the collaboration MIMO information for serving BS broadcasts and one or more cooperation BS.That is, scheduler directly sends to each BS by operating relevant order to collaboration MIMO.
Fig. 1 conceptually illustrates the CoMP scheme being applied to wireless communication system under multi-cell environment.
See Fig. 1, exist in multi-cell environment inner (intra) strengthen Node B (eNB) 110 and 120 and between (inter) eNB 130.Inner eNB covers multiple community (or sector) in Long Term Evolution (LTE) system.The community that eNB belonging to subscriber equipment (UE) covers and UE are in the relation of inner eNB.Namely, the ShieNBNei community, community (intra-eNB cell) that the identical eNB managing community, UE place covers, and the ShieNBJian community, community (inter-eNB cell) that the eNB different from the eNB of the Serving cell of management UE covers.
The community that the identical eNB of service UE covers is by x2 interface exchange message (such as, data and channel condition information (CSI)), and the community that the eNB different from the service eNB of UE covers is via information between backhaul 140 exchanging cell.As shown in fig. 1, be arranged in single subdistrict (or sector) single cell mimo user 150 can with a service eNB communication of community (or sector), and be arranged in cell edge multiple cell MIMO user 160 can with multiple service eNB communications of multiple community (or sector).
As mentioned above, eNB (or community) performs the CoMP operation being used for UE in multi-cell environment.But, for the CoMP operation based on FFR under multi-cell environment, for effectively estimating that interference from neighbor cell is so that the technology improving the performance of the UE at cell edge place still awaits specification.
Summary of the invention
Technical problem
The target of the present invention being designed to solve this problem is the method being provided for estimating channel status at mobile radio station (MS) place in the wireless communication system using fractional frequency reuse (FFR).
Technical scheme
Therefore, the present invention relates in a kind of wireless communication system using fractional frequency reuse and estimate the method for channel status, and use the mobile radio station of the method, it substantially avoid one or more problems that restriction and shortcoming due to prior art cause.
A target of the present invention is to provide a kind of method estimating channel status in wireless communication system using fractional frequency reuse (FFR).
Another target of the present invention is to provide the mobile radio station (MS) estimating channel status in a kind of wireless communication system using FFR.
Other advantage of the present invention, target and feature will partly be set forth in the following description, and partly will become apparent for the those skilled in the art that have studied following content, or can know from the practice of the present invention.By structure specifically noted in write description and its claim and accompanying drawing, can realize and reach object of the present invention and other advantage.
In order to realize these targets with other advantages and according to object of the present invention, as here embodied with broadly described, estimate the method for channel status at MS place in a kind of wireless communication system using FFR, comprise: the cell identifier (ID) obtaining Serving cell and one or more neighbor cell, according to the community ID obtained, obtain the information relevant with the predetermined power rank pattern for one or more frequency partition, FFR is applied to described one or more frequency partition, and estimates the channel status of Serving cell based on power level pattern information.
The method can also comprise: from the power level of the enhancing frequency partition of cell receiver Serving cell, and channel status is estimated, use the power level of the enhancing frequency partition of power level pattern information and the Serving cell obtained, the channel status of Serving cell and/or one or more neighbor cell can be estimated.
The method also comprises the power level of the enhancing frequency partition receiving one or more neighbor cell from one or more neighbor cell, and channel status is estimated, use the power level of the enhancing frequency partition of power level pattern information and the one or more neighbor cell obtained, the channel status of one or more neighbor cell can be estimated.
The method also comprise by based on the channel status estimated the information feedback that generates to Serving cell.
Predetermined power rank pattern information can comprise the information be used to indicate applying the frequency partition being set to enhancing or non-reinforcing among one or more frequency partition of FFR.
In another aspect of this invention, estimate the MS of channel status in a kind of wireless communication system using FFR, comprising: community ID acquisition module, it is for obtaining the community ID of Serving cell and one or more neighbor cell; Power level pattern acquiring module, it is for according to community ID, and obtain the information relevant with the predetermined power rank pattern for one or more frequency partition, FFR is applied to described one or more frequency partition; And channel estimation module, it is for estimating the channel status of Serving cell based on power level pattern information.
MS can also comprise receiver module, it is for the power level of the enhancing frequency partition from cell receiver Serving cell, and channel estimation module uses the power level of the enhancing frequency partition of power level pattern information and the Serving cell obtained, and can estimate the channel status of Serving cell and/or one or more neighbor cell.
MS can also comprise receiver module, it is for receiving the power level of the enhancing frequency partition of one or more neighbor cell from one or more neighbor cell, and channel estimation module uses the power level of the enhancing frequency partition of power level pattern information and the one or more neighbor cell obtained, and can estimate the channel status of one or more neighbor cell.
It is exemplary and explanatory for it should be understood that above-mentioned summary of the present invention describes with detailed description hereafter, and it aims to provide the further explanation to the present invention for required protection.
Beneficial effect
According to embodiments of the invention, by effectively estimating the interference from one or more neighbor cell, improve the performance of cell edge place UE.
Accompanying drawing explanation
Appended accompanying drawing is included to provide a further understanding of the present invention, and it is merged in and forms a application's part, it illustrates embodiments of the invention, and together with the description for explaining principle of the present invention.In the accompanying drawings:
Fig. 1 shows the concept of CoPM between conventional enhancing Node B (eNB) interior multipoint cooperative (CoMP) and eNB.
Fig. 2 shows the physical channel used in mobile communication system, the third generation (3G) partner program (3GPP) Long Term Evolution (LTE) and the general signal transmission method using this physical channel.
Fig. 3 shows the position according to the UE in community in multi-cell environment, and subscriber equipment (UE) receives the example of service from one or more eNB.
Fig. 4 shows in multi-cell environment as implementing the example of hard (hard) fractional frequency reuse (FFR) based on the CoMP operation of FFR.
Fig. 5 shows in multi-cell environment as implementing the example of soft (soft) FFR based on the CoMP operation of FFR.
Fig. 6 shows in multi-cell environment as implementing another example of soft FFR based on the CoMP operation of FFR.
Fig. 7 shows the example format of Frequency Division Duplexing (FDD) (FDD) down link (DL) frame in 3GPP LTE mobile communication system.
Fig. 8 is the block diagram of the UE according to exemplary embodiment of the present invention.
Embodiment
Hereinafter with reference to accompanying drawing, exemplary embodiment of the present invention is described in detail.Detailed description given by hereinafter with reference accompanying drawing is intended to explain exemplary embodiment of the present invention, but not the embodiment that can realize according to the present invention is only shown.Hereafter detailed description comprises specific detail, to provide thorough understanding of the present invention.But, it is apparent to those skilled in the art that when there is no these specific detail, also can implement the present invention.Such as, give hereafter describe in detail when supposing that mobile communication system is third generation partner program (3GPP) Long Term Evolution (LTE) system.But these descriptions can be applied to any other mobile communication system except the intrinsic special characteristic of 3GPP LTE system.
In some instances, known structure and equipment are omitted, or focus on that the key character of this structure and equipment is illustrated in form of a block diagram, so that concept of the present invention is not fuzzy.In whole specification, use identical Reference numeral to represent same or similar parts.
In the following description, suppose that " subscriber equipment (UE) " refers to movement or the fixed-line subscriber end equipment of such as mobile radio station (MS), advanced mobile station (AMS) etc., and suppose that " strengthening Node B (eNB or e Node B) " refers to any node of the network terminal that such as Node B, base station (BS), access point (AP) etc. communicate with UE.
In mobile communication system, UE can receive information from eNB on down link (DL), and in up link (UL), information is sent to eNB.The information sent from UE or receive at UE comprises data and various control information, and according to the type of this information with make for defining multiple physical channel.
Fig. 2 shows in mobile communication system, the general signal transmission method of the physical channel used in 3GPP LTE and this physical channel of use.
See Fig. 2, to connect or when initially entering community, UE performs search of initial zone in step s 201 at power supply, it relates to, and to obtain with eNB synchronous.Or rather, UE, by receiving primary synchronization channel (P-SCH) and secondary synchronizing channel (S-SCH) from eNB, obtains the information with the synchronous of eNB and such as cell identifier (ID).Subsequently, UE can obtain by receiving Physical Broadcast Channel (PBCH) information broadcasted in community.Meanwhile, UE can determine DL channel status by receiving DL reference signal (RS) during search of initial zone.
After search of initial zone, UE can also by receiving physical downlink control channel (PDCCH) and the physical down link sharing channel (PDSCH) that is associated with PDCCH obtains particular system information in step S202.
If UE initially accesses eNB or also do not distribute to the Radio Resource of UE for Signal transmissions, so in step S203 to S206, UE can perform random access procedure.Specifically, predetermined sequence can be sent to eNB by UE in step S203 on Physical Random Access Channel (PRACH), and on PDCCH and the PDSCH that is associated with PDCCH, receives the response message for sent sequence in step S204.For the Stochastic accessing based on competition except switching, UE, by the PDSCH sending other PRACH and receive PDCCH and be associated with PDCCH in step S206 in step S205, can perform contention resolved process.
Subsequently, it is as described below that general DL/UL send/receive process.Or rather, the PDSCH that UE receives PDCCH and is associated with PDCCH in step S207, and in step S208, send physical uplink link shared channels (PUSCH) and physical uplink control channel (PUCCH).UE is sent to eNB or comprises DL/UL acknowledgement/non-acknowledgement (ACK/NACK) signal, CQI (CQI)/pre-coding matrix index (PMI)/order designator (RI) etc. from the control information of eNB reception on DL on UL.In 3GPPLTE system, UE can send the control information of such as CQI, PMI and RI on PUSCH and/or PUCCH.
The term used herein, when using with geographic significance, " eNB " can exchange with " community " or " sector ".Be considered to provide the service eNB (or community) of the conventional eNB of main services can send and receiving control information in CoMP.In this context, service eNB (or community) can be called anchor (anchor) eNB (or community).Similarly, with geographic significance, adjacent eNB also can be called as neighbor cell.Term " community " and " sector " mean the basic network element implementing FFR.Therefore these terms use each other convertibly, because community and sector provide service by FFR to the UE at cell edge place.
CoMP operation can improve the communication performance of the UE at cell edge place in multi-cell environment.Main existence two kinds of CoMP operation patterns: Combined Treatment (JP) pattern and cooperative scheduling/Wave beam forming (CS/CB) pattern, Combined Treatment (JP) pattern is the cooperation multiple-input and multiple-output (MIMO) based on data sharing, and cooperative scheduling/Wave beam forming (CS/CB) pattern is divided into the poorest partner (companion) and best partner, be intended to reduce presence of intercell interference.The poorest partner's scheme decreases interference, because UE causes the poorest PMI report of most severe jamming to service eNB by for performing the community (CoMP cell) of CoMP operation, thus CoMP cell uses the suboptimum PMI except the poorest PMI.Than the poorest partner's scheme, in best partner's scheme, UE causes the best PMI of least interference for CoMP cell to service eNB report, and therefore CoMP cell uses best PMI, thus reduces presence of intercell interference.In this context, can say, it is the communication plan that UE cooperates that CoMP covers service eNB and adjacent eNB in multi-cell environment.
In order to implement FFR in multi-cell environment, each eNB can use different frequency bands (or different frequency partition (FP)) on sub-channels.But some tones (tone) are used publicly in all sectors, thus have be 1 frequency duplex factor as one, and other tones are used in sector, in each sector 1/3 tone, thus have be 1/3 frequency duplex factor as one.Frequency duplex factor as one can change according to network settings.FFR scheme is divided into hard FFR and soft FFR.When some tones do not use in hard FFR, some tones use with low power level in soft FFR.Therefore, FFR can be implemented in every way according to setting, and effectively reduce presence of intercell interference.Therefore, FFR configuration information should be shared between eNB and/or UE, effectively to implement FFR in actual applications.
Especially, in soft FFR, when from the signal being received from multiple community to measure CQI, UE needs the through-put power knowing each frequency band (or FP).That is, other information of interference level estimating such as adjacent eNB is necessary, to use FFR to perform effective CoMP operation in multi-cell environment.
When cell edge UE, due to the interference from neighbor cell, the receptivity of signal may be reduced.But the FFR scheme based on multiple cell is passed through to reduce the interference from neighbor cell, can improve the performance of the UE at cell edge.Multiple cell FFR can be considered to the special circumstances of the CS/CB in CoMP system.
Using in the environment based on the FFR of multiple cell, implement the community of FFR by arranging special frequency band in enhancing (boost) or non-reinforcing (non-boost) process, can reduce presence of intercell interference, the impact of this presence of intercell interference is arranged in the UE that cell edge operates at special frequency band.
Fig. 3 shows in multi-cell environment UE receives service from one or more eNB example according to its position in community.
Belong to community A see Fig. 3, UE a and therefore receive service from community A.But, because the cell edge of UE a between community A and community B, so community B can affect UE a.Similarly, although UE b belongs to community B, and therefore receive service from community B, because the cell edge of UE b between community A and community B, so community A can affect UE b.Community C serves UE c1, but due to its cell edge between community C and community B, so community B can affect UE c1.Community C also serves UE c2, but due to its cell edge between community C and neighbor cell, so neighbor cell (not shown) can affect UE c2.Although UE d receives service from community D, community B and C can affect UE d, because its cell edge between community B, C and D.
Because UE a, b, c1, c2 and d to be subject to the impact of their neighbor cells due to it at the cell edge at least between Liang Ge community simultaneously, so the data throughout of service that their receive reduces due to the cochannel interference from neighbor cell.Otherwise the UE (such as: inner UE) of the heart is not by the impact from the interference of neighbor cell in the cell.
Fig. 4 shows in multi-cell environment as implementing the example of hard FFR based on the CoMP operation of FFR.
See Fig. 4, according to FFR implement relevant some criterions can by community can whole frequency resources divide into groups.First, whole frequency bands (or FP) of community are roughly divided into for the frequency band of edge customer (that is, edge UE) and the frequency band for internal user (that is, inner UE).
In FFR, the frequency band for edge customer can be divided into again multiple less frequency band.In the situation shown in Fig. 4, the frequency band multiplexing factor of FFR is 1/3 (FFR 1/3).FFR 1/3 when, the frequency resource for edge customer is divided into 3 frequency fields, and service is supplied to the edge customer in one of 3 frequency fields by each eNB.
According to the present invention, in service UE to each community can frequency resource can be grouped into multiple frequency resource group.Frequency resource group can be called frequency band or FP.Can to classify frequency resource group according to FFR use of being correlated with.As shown in Figure 4, can according to FFR be correlated with use by for community can whole frequency resource components become 3 frequency bands.
For community A, such as, the first frequency band 410 is the frequency resource groups for edge customer, is expressed as at " FFR_ frequency band _ edge ".Second frequency band 420 and 430 be be assigned as among for the frequency resource group of edge customer, not used for the frequency resource group of edge customer, be expressed as " FFR_ frequency band _ inside ".3rd frequency band 440 is the frequency resource groups for internal user, is expressed as " inside _ frequency band ".
As shown in Figure 4, each community only uses 1/3 of the frequency resource distributing to edge customer for the edge customer of community.Therefore, the frequency duplex factor as one for Cell Edge User is 1/3.On the other hand, the whole frequency resource of internal user is distributed to for the internal user in community.Therefore, for internal user, frequency duplex factor as one is 1.
Fig. 5 shows in multi-cell environment as implementing the example of soft FFR based on the CoMP operation of FFR.
See Fig. 5, can by for community can whole frequency resources be divided into four frequency resource groups 510 to 540 (group 1 to group 4).Group 1, group 2 and group 3 are frequency resources of the edge UE distributing to community, with the frequency resource group 410 shown in Fig. 4,420 and 430 corresponding.Group 4 is the frequency resource groups of the inside UE distributing to the heart in the cell, corresponding with the frequency resource group 440 shown in Fig. 4.Community A, B in Fig. 5 are corresponding with C with community A, the B in C and Fig. 4.
The soft FFR shown in Fig. 5 is implemented, except the decline that soft FFR can prevent bandwidth efficiency in the mode similar to the hard FFR shown in Fig. 4.Owing to not using some frequency resource groups (such as, the frequency resource group 420 and 430 in the community A of Fig. 4), the decline of bandwidth efficiency can be suffered together with hard FFR.Following description is carried out under the background of community A.By for community A can whole frequency resources be divided into four frequency resource groups.In Figure 5, the UE that group 1, group 2 and group 3 are used at cell edge, have be 1 frequency duplex factor as one.Therefore, in group 1, one of group 2 and group 3, that is, service can be provided to the UE at cell edge at group 1 (FFR_ frequency band _ edge) small area A.Other two frequency resource groups, group 1 and group 2 (FFR_ frequency band _ inside) are not used to edge UE.Meanwhile, group 4 is frequency resource groups (inside _ frequency band) of the UE being assigned to the heart in cell a, have be 1 frequency duplex factor as one.
Than the hard FFR shown in Fig. 4, in soft FFR scheme, service additionally can be supplied to inner UE by community A in group 2 and group 3 (FFR_ frequency band _ inside).In order to this object, community A arranges the low transmission power for organizing 2 and group 3, thus avoids producing with the UE at the cell edge place of community B and community C disturbing.
In like fashion, soft FFR is by dividing into groups frequency resource and making, for arranging the different transmission power level being used for frequency resource group, can increase frequency efficiency according to it.
When shown in Figure 5, according to the use of frequency resource group, three power level can be defined for the service UE in each community, to make PFFR_ frequency band _ edge >=P inside _ frequency band > PFFR_ frequency band _ inside.In the frequency resource group FFR_ frequency band _ edge with frequency duplex factor as one 1/3, with power level PFFR_ frequency band _ edge, service can be provided to edge UE, in the frequency resource group FFR_ frequency band _ inside with frequency duplex factor as one 1/3, with power level PFFR_ frequency band _ inside, service is provided to inner UE, and with power level P inside _ frequency band, service is provided to inner UE in the frequency resource group inside _ frequency band with frequency duplex factor as one 1.
In order to effectively implement soft FFR, need to arrange power level to each frequency resource group, and eNB and/or UE needs the power level knowing frequency resource group.Especially in order to effectively operate in CoMP CS (cooperative scheduling) pattern using FFR in multi-cell environment, UE needs other information of interference level estimating such as neighbor cell.Preferably, UE understands the power level of the frequency resource group in each neighbor cell and the power level of frequency resource group in the serving cells, so that estimation CQI etc. effectively.
Self adaptation FFR scheme can be regarded as the distribution according to the user in community (sector) and effectively implement FFR.Self adaptation FFR scheme adjusts bandwidth or the ratio of each frequency resource group neatly.In order to the enforcement of self adaptation FFR scheme, each eNB and/or UE needs to understand about each bandwidth of frequency resource group or the information of ratio.
Now be described in multi-cell environment as CoMP operation implements the FFR information required for FFR.
Service eNB can notify to the UE performing FFR for CoMP operation: enhancing (boosted) the frequency resource group of Serving cell and/or one or more neighbor cell and non-reinforcing (non-boosted) frequency resource group.By transmission replacement response (bitmap) or the index passing through the enhancing frequency resource group sending Serving cell and/or one or more neighbor cell, can notify.
Implement multiple communities of FFR use identical enhancing rank with identical non-reinforcing rank and strengthen rank and non-reinforcing rank preset when, power level can be expressed with ON/OFF (on/off) binary code.Service eNB simply need to UE and notifies whether each frequency resource group used in Serving cell and neighbor cell is enhanced subsequently.If it is equal in all FFR communities to strengthen power level, strengthen power level or the enhancing power level of each neighbor cell can be arranged to Serving cell equal so can be pre-defined.
Alternatively or additionally, the pattern strengthening power level and non-reinforcing power level can for the FFR factor (such as FFR 1/2,1/3,1/4 ... 1/n) preset.Therefore, service eNB only can notify to strengthen class pattern according to the FFR of the community of frequency duplex factor as one to UE.Hereinafter, describe FFR by way of example and strengthen class pattern.
See Fig. 5, frequency duplex factor as one 1/3 is utilized to implement FFR.Class pattern can be strengthened for frequency duplex factor as one 1/3 defines three kinds.Implement each enhancing power level and the non-reinforcing power level strengthening one of class pattern according to three kinds of FFR in the community of FFR, determine the transmission power level of its frequency resource group.
Frequency duplex factor as one 1/3 when, the example that the FFR for community strengthens class pattern is hereafter arranging into [table 1].
Table 1
[table 1]
| Group 1 | Group 2 | Group 3 | |
| Community A | Strengthen | Non-reinforcing | Non-reinforcing |
| Community B | Non-reinforcing | Strengthen | Non-reinforcing |
| Community C | Non-reinforcing | Non-reinforcing | Strengthen |
See [table 1], first, second, and third FFR strengthens class pattern can be defined as [group 1, group 2 respectively, group 3]=[strengthening, non-reinforcing, non-reinforcing], [group 1, group 2, group 3]=[non-reinforcing, strengthen, non-reinforcing], and [group 1, group 2, group 3]=[non-reinforcing, non-reinforcing strengthen].
Frequency duplex factor as one 1/4 when, the example that the FFR for community strengthens class pattern is hereafter arranging into [table 2].
Table 2
[table 2]
| Group 1 | Group 2 | Group 3 | Group 4 | |
| Community A | Strengthen | Non-reinforcing | Non-reinforcing | Non-reinforcing |
| Community B | Non-reinforcing | Strengthen | Non-reinforcing | Non-reinforcing |
| Community C | Non-reinforcing | Non-reinforcing | Strengthen | Non-reinforcing |
| Community D | Non-reinforcing | Non-reinforcing | Non-reinforcing | Strengthen |
With reference to [table 2], when the FFR factor is 1/4, four kinds of FFR can be there are and strengthen class pattern.Such as, first to fourth FFR enhancing class pattern can be defined as [group 1, group 2, group 3, group 4]=[enhancing respectively, non-reinforcing, non-reinforcing, non-reinforcing], [group 1, group 2, group 3, group 4]=[non-reinforcing strengthens, non-reinforcing, non-reinforcing], [group 1, group 2, group 3, group 4]=[non-reinforcing, non-reinforcing, strengthen, non-reinforcing], and [group 1, group 2, group 3, group 4]=[non-reinforcing, strengthens for non-reinforcing, non-reinforcing].To UE, Serving cell can notify that the FFR of neighbor cell as above strengthens class pattern.
Except notifying by eNB except the enhancing rank of frequency band implementing to use in multiple communities of FFR and the said method of non-reinforcing rank to UE, UE can select the FFR preset to strengthen power level pattern based on community ID.Herein, when any specific instruction not from eNB, effectively FFR can be implemented.That is, UE can perform FFR effectively based on the community ID of the neighbor cell of implementing FFR.According to the community function of each neighbor cell, (such as (community ID mould (the 1/FFR factor)) uses default FFR to strengthen power level pattern to UE.In this case, UE only needs the community ID obtaining neighbor cell during measuring neighbor cell.In addition, UE can obtain the ID of Serving cell.The community of implementing FFR can use identical enhancing power level and identical non-reinforcing power level.
Such as, in FFR-1/3 system, UE, according to (the community ID mould 3) of each neighbor cell, uses default FFR to strengthen power level.With reference to [table 1], if (community ID mould 3)=0, so [strengthen, non-reinforcing, non-reinforcing] FFR be presented as community A and strengthen class pattern.(if community ID mould 3)=1, so the FFR of community B strengthens class pattern is [non-reinforcing strengthens, non-reinforcing].In an identical manner, if (community ID mould 3)=2, so [non-reinforcing, non-reinforcing strengthen] FFR be presented as community C strengthens class pattern.By this way, once UE has to strengthen the relevant information of default mapping between class pattern and community ID with FFR, so it can utilize community ID to perform FFR simply and effectively.
As mentioned above, when using predetermined power level pattern based on community ID, each UE strengthens class pattern according to FFR and implements FFR, this FFR enhancing class pattern to each physical frequencies Region specification enhancing rank or non-reinforcing rank.
Except the method, the enhancing physics frequency field being used for each community can also be expected to be appointed as group 1, and implement FFR according to power level pattern, carry out this power level pattern predetermined based on group index.Or rather, always group 1 can be preset as enhancing frequency field, instead of perform FFR operation (such as according to the difference enhancing frequency resource group arranged for different districts, for the FFR operation in Fig. 5, be respectively community A, community B and community C arranges group 1, group 2 and group 3).In this case, UE also uses predetermined power level pattern to perform FFR based on community ID based on group index.
With reference to figure 5, when using power level pattern according to community ID in the above described manner, if (community ID mould 3=0), so for community A provides [group 1, group 2, group 3]=[enhancing, non-reinforcing, non-reinforcing] FFR strengthen class pattern.The FFR of [group 1, group 2, group 3]=[non-reinforcing, strengthen, non-reinforcing] that the community B with (community ID mould 3=1) has strengthens class pattern.In the same way, for having the FFR enhancing class pattern of community C setting [group 1, group 2, group 3]=[non-reinforcing, non-reinforcing strengthen] of (community ID mould 3=2).
Simultaneously, if strengthen frequency field be all designated as group 1, so FFR is strengthened class pattern be respectively have (community ID mould 3=0) community A be defined as [group 1, group 2, group 3]=[strengthen, non-reinforcing, non-reinforcing] or [group 1, group 3, group 2]=[strengthen, non-reinforcing, non-reinforcing], and [organize 2 for the community B with (community ID mould 3=1) is defined as, group 1, group 3]=[non-reinforcing strengthens, non-reinforcing] or [group 3, group 1, group 2]=[non-reinforcing strengthens, non-reinforcing].
In an identical manner, strengthening class pattern for the community C with (community ID mould 3=2), FFR is [group 2, group 3, group 1]=[non-reinforcing, non-reinforcing strengthen] or [group 3, group 2, group 1]=[non-reinforcing, non-reinforcing strengthen].
Because utilize identical group index (such as, group 1) to mark the enhancing physics frequency field of each community, so different group indexes can be assigned to the same physical frequency field for different districts.By the enhancing physics frequency field of each community is indexed for organize 1 and other frequency fields of community are indexed for organize 2 and the new FFR that create of group 3 strengthen class pattern and can be sent to each UE by eNB with signal, or can be known by UE in advance when there is no other signaling.
In this way, each UE, according to the above-mentioned group index of the enhancing frequency field as group 1, uses the predetermined power rank pattern being used for each community ID to implement FFR, is described with reference to Fig. 6.
Fig. 6 shows in multi-cell environment as implementing another example of soft FFR based on the CoMP operation of FFR.
Than the situation shown in Fig. 5, wherein the FFR frequency field of each community is physically aimed at, namely, the same physical frequency field of different districts is indexed into identical number (such as, frequency field 610 is group 1, frequency field 620 is group 2, frequency field 630 is group 3), can to index physical frequencies region to different districts in a different manner.Specifically, physical frequencies region 610 can be community A and indexed as strengthening the group 1 of frequency field, can be community B and indexed as non-reinforcing frequency field, group 3, and can be community C and indexed as non-reinforcing frequency field, group 2.
Similarly, physical frequencies region 620 can be community A and indexed as organizing 2, can be community B and being indexed as organizing 1 and be community C and being indexed as group C.
In like fashion, different index can be utilized to mark identical physical frequencies region to different districts.
By at hereafter Short Description in order to effective based on the FFR of community ID, operate from the UE of the one or more neighbor cell acquisition community ID operated with CoMP pattern (that is, the collaboration mode between community).
The example format of Frequency Division Duplexing (FDD) (FDD) the DL frame in 3GPP LTE mobile communication system is shown the example for mobile communication system by Fig. 7.
With reference to figure 7, a descending chain circuit frame can comprise 10 subframes, and each subframe has two time slots.Each time slot can have 6 or 7 OFDM (OFDM) symbols.Or rather, when using normal cyclic prefix (CP), a time slot can comprise 7 OFDM symbol, and when using expansion CP, a time slot can comprise 6 OFDM symbol.
Primary synchronization channel (P-SCH) and secondary synchronizing channel (S-SCH) can be assigned to the first time slot of subframe 0 and subframe 5.Master sync signal (PSS) can be mapped to the last OFDM symbol of time slot 0 and time slot 10, and secondary synchronizing signal (SSS) can be mapped to the symbol before the symbol of carrying PSS.
In LTE system, UE does not have about with the information of the neighbor cell of CoMP operation, but receives the community ID collection information comprising neighbor cell id information from service eNB.Therefore, UE can use the SCH of community ID collection and neighbor cell to come neighbor identification.
There are 504 physical cell identifier (PCI) in LTE system.504 PCI are grouped into 168 community ID groups, each have three community ID.PCI is expressed as following equalities.
[equation 1]
Wherein,
represent PCI,
represent the number of PCI group, scope from 0 to 167, and
represent the number of the PCI in PCI group, scope is from 0 to 2.
The information that the community ID that UE can obtain three community ID in the ID group of community from PSS is relevant, and the information that the community ID group obtained 168 community ID groups from SSS is relevant.Therefore, UE can neighbor identification based on ID Zu He community, the community ID obtained.That is, UE can obtain the sequence of neighbor cell for pilot transmission from the SCH of neighbor cell.
From the sequence d (n) generating the PSS being used for neighbor cell according to frequency domain Zadoff-Chu sequence du (n) of [equation 2].
[equation 2]
Wherein, Zadoff-Chu root sequence index u (root sequence index) provides with table 3.
Table 3
[table 3]
[table 3] shows the root index for PSS above.Be used in the root index shown in [table 3] and PSS sequence can be generated.
SSS sequence d (0) ..., d (61) is the staggered cascade of the binary sequence of two length 31.The scramble sequence given by PSS is utilized to carry out scrambling to modular cascade sequence.
According to [equation 3], being combined between subframe 0 and subframe 5 of sequence of two length 31 of definition SSS is different.
[equation 3]
Wherein, 0≤n≤30, and according to [equation 4], from PCI group
in draw index m
0and m
1.
[equation 4]
m
0＝m′mod31
When UE based on community ID use the FFR preset strengthen class pattern effectively perform FFR time, community ID can be physical district ID or global cell ID or both.
In multi-cell environment, differently can arrange in multiple communities of implementing FFR and strengthen power level and non-reinforcing power level.Enhancing power level and the non-reinforcing power level of each community are pre quantized power value.Service eNB can notify that UE is used to indicate the index of the enhancing power level of each community and the quantized power value of non-reinforcing power level.
Service eNB can send to UE the replacement response being used to indicate the quantized power value of each frequency resource group.Except the quantized power value of each community, service eNB can also indicate the index of the enhancing frequency resource group of each community to UE.Such as, if for frequency resource group and for three frequency resource groups with FFR operation three communities define 9 power level P0 to P9, following replacement response can be configured.
Table 4
[table 4]
| Group 1 | Group 2 | Group 3 | |
| Community A | P 0 | P 1 | P 5 |
| Community B | P 4 | P 2 | P 1 |
| Community C | P 0 | P 6 | P 1 |
As mentioned above, UE estimates the interference rank of neighbor cell effectively based on the FFR information received from service eNB.Therefore, it is possible to improve the communication performance of Cell Edge User.
Described above is service eNB and be sent to the details of the FFR information of UE.FFR information can be sent to UE according to how configuring CoMP collection (CoMP set) by service eNB in two ways.Therefore, the method configuring CoMP collection in CoMP wireless communication system will be first described in.
For effective CoMP operation, be necessary the neighbor cell defined performing CoMP operation for UE.CoMP can be integrated be defined as by as UE with the set of the neighbor cell of CoMP operation.
First, service eNB and UE can share the information about CoMP collection in advance.
Measure based on UE and can configure CoMP collection.The CoMP collection configuration of measuring based on UE ensure that and arranging flexibility in CoMP collection with the neighbor cell directly affecting UE.UE, by advance from the list of service eNB reception of neighboring cell or by its oneself measurement neighbor cell, can make neighbor cell list.UE measures the interference rank of neighbor cell listed in neighbor cell list.The interference rank of neighbor cell can be reference symbol received power (RSRP), the reference symbol quality of reception (RSRQ), reference signal strength designator (RSSI), carrier wave and interference plus noise ratio (CINR), Signal to Interference plus Noise Ratio (SINR), propagation delay (PD) etc.
By this way, in LTE system, UE is based on RSRP, can measure the channel quality states between UE and community, the power of the pilot signal that this RSRP Shi Cong community receives.RSRP is the linear averaging of power in measured frequency bandwidth, and the resource element that this power is assigned at community specific (cell-specific) RS distributes.The power of each resource element Resource Block can be determined from the received energy in the significant character cycle except CP.In wireless heterogeneous networks _ free time (RRC_ is idle) state and RRC_ connection status, RSRP is applicable to UE.If UE operates with receive diversity, the value so reported equals the linear averaging of the performance number of all diversity branches.
UE can by the information reporting required for the configuration of CoMP collection to service eNB based on the measurement (such as, RSRP measures) of neighbor cell.The information reported can comprise the one or more above-mentioned measurement of each neighbor cell and the community ID of each neighbor cell.When UE oneself makes neighbor cell list, metrical information report can be utilized to be included in the community ID of the one or more neighbor cells in neighbor cell list by UE.On the other hand, if neighbor cell list is supplied to UE by service eNB in advance, the predefined procedure of ZeUEYi community ID sends the measurement about neighbor cell, or the measurement of community ID and index.Or UE arranges the index of community ID with other order of interference level, and measurement relevant with the neighbor cell corresponding with the index of the community ID of arrangement for the index of the community ID of arrangement is sent to service eNB.
When service eNB and UE measure based on UE as above, when sharing information (such as the community ID) about CoMP collection, the FFR information preset about CoMP collection can be sent to UE by service eNB.Specifically, when any cell ID information not being sent to UE, service eNB sends FFR information with the predefined procedure of community ID or with other order of the interference level corresponding with community ID.
Secondly, the information about CoMP collection can be sent to UE by service eNB.
CoMP collection based on UE measurement configures the risk that the measurement expense of UE and feedback transmission overhead may be emitted significantly to increase and guarantees the flexibility that CoMP collection configures.Under this background, CoMP collection can parameter Network Based and being configured, to realize suitable measurement expense and feedback transmission overhead.Therefore, service eNB according to predetermined criterion, when not having UE to measure, can configure CoMP collection.Then, service eNB needs the information about CoMP collection to be sent to UE.The id information concentrating multiple communities of comprising relevant at CoMP can be indicated by interim BS index.Specifically, service eNB can configure CoMP collection, and the interim BS index of the neighbor cell (or adjacent eNB) of CoMP collection is sent to UE.Service eNB can be sent to UE (that is, interim BS index+FFR information) by with the FFR information that each interim BS index is associated together with interim BS index.
FFR information is sent to UE by higher level signaling or layer 1/ layer of 2 (L1/L2) control signal by service eNB.By higher level signaling, service eNB can notify that UE is included in community ID or the community ID index of the neighbor cell that CoMP concentrates.When needed, the FFR information about neighbor cell can be sent to UE by service eNB.In addition, service eNB by community ID (or community ID index) and/or FFR property information cycle ground or can be sent to UE with event triggered fashion.
Usually, service eNB can send dispatching distribution and other control informations on PDCCH.Physical control channel can be sent in the polymerization (aggregation) of one or several continuous control channel elements (CCE), each CCR is corresponding with 9 resource element groups.The number not being assigned to the resource element group of physical control format indicator channel (PCFICH) or physical mixed automatic repeat request indicator channel (PHICH) is NREG.In systems in which can CCE by from 0 to N
cCE-1numbering, wherein
pDCCH is supported in multiple format listed in [table 5].The PDCCH occupying n continuous CCE only starts on the CCE meeting i mod n=0, and wherein i is No. CCE.Multiple PDCCH can be sent in a subframe.
Table 5
[table 5]
| PDCCH form | The number of CCE | The number of resource element group | The number of PDCCH bit |
| 0 | 1 | 9 | 72 |
| 1 | 2 | 18 | 144 |
| 2 | 4 | 36 | 288 |
| 3 | 8 | 72 | 576 |
See [table 5], the number in the region be sent out can be selected PDCCH form according to control information by eNB.UE can read control information on the basis of CCE then CCE (CCE-by-CCE), therefore reduces expense.
As described above, the community ID and FFR information that are included in the community that CoMP concentrates are sent to UE by L1/L2 control signal by service eNB.That is, configure with down link control information (DCI) form different from conventional DCI format the PDCCH carrying community ID and FFR information.Or, in order to multiplexing (reuse) conventional DCI format, by still using some fields of conventional DCI format and filling other fields with zero or fill arbitrary value in other fields, configure the DCI format of PDCCH.
Now estimate that the UE of channel status is described according to the present invention in the CoMP operation pattern using FFR.
Fig. 8 is the block diagram of the UE according to exemplary embodiment of the present invention.
Comprise reception (Rx) module 810, processor 820, memory cell 830 see Fig. 8, UE 800 and send (Tx) module 840.
Rx module 810 can comprise module 811 and enhancing power level for receiving Serving cell, and comprises module 812 and for the enhancing power level of reception of neighboring cell.Rx module 810 can from the external equipment Received signal strength of such as service eNB or information.Such as, Rx module 810 can receive RS, to estimate channel status from Serving cell and neighbor cell.On the other hand, UE 800 knows the predetermined power rank pattern for one or more frequency band in advance in the present invention, and FFR is applied to this one or more frequency band.
Processor 820 can comprise community ID acquisition module 821, power level pattern acquiring module 822 and channel estimation module 823.
Community ID acquisition module 821 can obtain its ID from Serving cell and one or more neighbor cell.Power level pattern acquiring module 822 can obtain predetermined power level pattern according to the community ID obtained.Channel estimation module 823 uses the power level pattern obtained can estimate the channel status of Serving cell.In addition, channel estimation module 823 uses the enhancing power level of FP that received by Rx module 811, that strengthened by Serving cell and the power level pattern of acquisition, can estimate the channel status of Serving cell and/or one or more neighbor cell.In addition, channel estimation module 723 uses the enhancing power level of FP that received by Rx module 811, that strengthened by one or more neighbor cell and the power level pattern of acquisition, can estimate the channel status of one or more neighbor cell.
Memory cell 830 can be stored in the information that Rx module 811 receives and the information calculated by processor 820 in the given time.Memory cell 830 can be replaced by buffer (not shown).
Signal, information etc. can be sent to the external equipment of such as service eNB by Tx module 840.Such as, the measurement of the interference rank of neighbor cell and community ID can be sent to service eNB by Tx module 840.Tx module 840 also can generate channel condition information based on the channel status of estimated neighbor cell, and by this information feedback to service eNB.
It is evident that from foregoing description, UE accurately and effectively can estimate the channel status of the community performing the CoMP operation using FFR.
The detailed description of the preferred embodiments of the present invention provided, realizes to make those skilled in the art and implements the present invention.Although describe the present invention with reference to preferred embodiment, it is apparent to those skilled in the art that when not departing from the spirit or scope of the present invention described in claims, various correction and change can be carried out to the present invention.Such as, by the element described in combination embodiments of the invention and/or the part of feature, embodiments of the invention can be formed.
Therefore, the present invention should be not limited to specific embodiment described herein, but should meet the widest range consistent with the principles described herein and feature.
Industrial applicibility
Estimate at mobile radio station (MS) place in a kind of wireless communication system using fractional frequency reuse (FFR) that the method for channel status is applied to such as 3GPP LTE, LTE-A, IEEE 802.16 mobile communication system of grade.
Claims (10)
1. in the wireless communication system using fractional frequency reuse (FFR), estimate a method for channel status at mobile radio station (MS) place, described method comprises:
From the information that cell receiver multipoint cooperative (CoMP) collects, described CoMP collection configured by described Serving cell, and described CoMP collection comprises the community performing CoMP operation, and described community comprises described Serving cell and at least one neighbor cell;
Obtain the information of regarding service cell identifier (ID), and;
When described FFR is applied to described Serving cell, according to predetermined rule, use the information of the relevant described Serving cell ID obtained, obtain in three downlink power class pattern and be applied to the downlink power class pattern be configured to four of Serving cell frequency partition;
Wherein, the downlink power class pattern of acquisition is different from the downlink power class pattern of the neighbor cell of described CoMP collection,
When described MS based on described CoMP collection information and executing described in CoMP operation time, send best PMI or the poorest PMI to described Serving cell, described best PMI causes the least interference of described CoMP collection, and the poorest described PMI causes the severe jamming of described CoMP collection,
Wherein, according to described predetermined rule, described frequency partition each is set to every community and has different power level, and
Wherein, the index of the frequency partition of the enhancing in the index of four frequency partition is 1.
2. method according to claim 1, also comprises:
The downlink channel status of described Serving cell is estimated based on obtained downlink power class pattern.
3. method according to claim 1, also comprises:
Obtain the information about neighbor cell identifiers (ID), and;
When described FFR is applied to described neighbor cell, according to predetermined rule, use the information of the relevant described neighbor cell ID obtained, obtain in three downlink power class pattern and be applied to the downlink power class pattern be configured to four of neighbor cell frequency partition.
4. method according to claim 2, also comprises:
Information feedback downlink channel status based on estimation generated is to described Serving cell.
5. method according to claim 1, wherein, described four frequency partition comprise the frequency partition of at least one frequency partition strengthened and at least one non-reinforcing.
6. method according to claim 1, wherein, determines described downlink power class pattern according to described Serving cell ID functional value.
7. method according to claim 3, comprises further:
Downlink power class pattern based on obtained neighbor cell estimates the downlink channel status of described neighbor cell.
8. in the wireless communication system using fractional frequency reuse (FFR), estimate the mobile radio station (MS) of channel status for one kind, described MS comprises:
Receiver module, for the information collected from cell receiver multipoint cooperative (CoMP), described CoMP collection configured by described Serving cell, and described CoMP collection comprises the community performing CoMP operation, described community comprises described Serving cell and at least one neighbor cell, and
Cell identifier (ID) acquisition module, it is for obtaining the information of regarding service cell identifier (ID);
Power level pattern acquiring module, it is for when described FFR is applied to described Serving cell, according to predetermined rule, use the information of the relevant described Serving cell ID obtained, obtain in three downlink power class pattern and be applied to the downlink power class pattern be configured to four of Serving cell frequency partition;
Wherein, the downlink power class pattern of acquisition is different from the downlink power class pattern of the neighbor cell of described CoMP collection,
Sending module, for when described MS based on described CoMP collection information and executing described in CoMP operation time, send best PMI or the poorest PMI to described Serving cell, described best PMI causes the least interference of described CoMP collection, and the poorest described PMI causes the severe jamming of described CoMP collection
Wherein, according to described predetermined rule, described frequency partition each is set to every community and has different power level, and
Wherein, the index of the frequency partition of the enhancing in the index of four frequency partition is 1.
9. MS according to claim 8, also comprises:
Channel status estimation module, for estimating the downlink channel status of described Serving cell based on obtained downlink power class pattern.
10. MS according to claim 8,
Wherein, described cell identifier (ID) acquisition module obtains the information about neighbor cell identifiers (ID), and;
Wherein, when described FFR is applied to described neighbor cell, according to predetermined rule, described power level pattern acquiring module uses the information of the relevant described neighbor cell ID obtained, and obtains and be applied to the downlink power class pattern be configured to four of neighbor cell frequency partition in three downlink power class pattern.
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| KR1020100002224A KR20100130543A (en) | 2009-06-03 | 2010-01-11 | The method of channel state estimation in wireless communication using fractional frequency reuse and mobile station using the same method |
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| PCT/KR2010/003578 WO2010140854A2 (en) | 2009-06-03 | 2010-06-03 | Method for estimating channel state in a wireless communication system using fractional frequency reuse and mobile station using the same |
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| CN102804638A (en) | 2012-11-28 |
| KR20100130543A (en) | 2010-12-13 |
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