CN102783165B - The interferometry mechanism that cellular orthogonal frequency division multiple access system medium frequency is multiplexing - Google Patents

The interferometry mechanism that cellular orthogonal frequency division multiple access system medium frequency is multiplexing Download PDF

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Publication number
CN102783165B
CN102783165B CN200880001723.6A CN200880001723A CN102783165B CN 102783165 B CN102783165 B CN 102783165B CN 200880001723 A CN200880001723 A CN 200880001723A CN 102783165 B CN102783165 B CN 102783165B
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interference
measurement results
travelling carriage
interference measurement
serving
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CN200880001723.6A
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Chinese (zh)
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CN102783165A (en
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傅宜康
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联发科技股份有限公司
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Priority to US60/980,431 priority
Priority to US12/287,925 priority patent/US8259601B2/en
Priority to US12/287,925 priority
Priority to US12/287,990 priority
Priority to US12/287,990 priority patent/US8351949B2/en
Application filed by 联发科技股份有限公司 filed Critical 联发科技股份有限公司
Priority to PCT/CN2008/072727 priority patent/WO2009052754A1/en
Publication of CN102783165A publication Critical patent/CN102783165A/en
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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
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • 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
    • H04L5/0037—Inter-user or inter-terminal allocation
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04—Wireless resource allocation
    • H04W72/08—Wireless resource allocation where an allocation plan is defined based on quality criteria

Abstract

In adaptability channeling technology, the travelling carriage of cellular orthogonal frequency division multiple access system operates on different radio resource region, and alleviates the interference between community with suitable frequency reuse mode and promote the capacity of system.In first novel feature, moving table measuring interference statistics amount also obtains interference measurement results.Travelling carriage report interference measurement results is to serving BS.Serving BS determines adaptability frequency reuse mode based on the interference measurement results received.In second novel feature, radio resource controls community and receives interference measurement results, determines frequency reuse mode and configure radio resources allocation according to the interference measurement results received.In the 3rd novel feature, base station obtains interference measurement results and schedule mobile stations with by suitable radio resource region service.

Description

The interferometry mechanism that cellular orthogonal frequency division multiple access system medium frequency is multiplexing

Technical field

The invention relates to cellular orthogonal frequency-time multiple access (OrthogonalFrequencyDivisionMultipleAccess, hereinafter referred to as OFDMA) system, and relate to the interferometry mechanism of adaptability channeling (adaptivefrequencyreuse) especially.

Background technology

In mobile radio system, channeling is an important technology, and it promotes the capacity of whole system by reusing rare Radio Spectrum Resource (radiospectrumresource).But the enhancement of power system capacity but can cause on line quality to worsen because adjoint interference strength rises.Under cellular OFDMA system, because the signal of different users can remain orthogonal when transmitting, thus there is no the interference (intra-cellinterference) of Intra-cell.But, because identical frequency band also can reuse by the base station of adjacent cell, reuse radio-frequency spectrum (namely: channeling) and interference (inter-cellinterference) between community will be caused.

Fig. 1 is the community configuration diagram of the cellular OFDMA system 1 of conventional art.Cellular OFDMA system 1 comprises a cell structure, and frequency duplex factor as one (frequencyreusefactor) 1/K of this cell structure equals 1/4.Frequency duplex factor as one 1/K can not share the number of cells of same frequency band when representing transmission.In the example depicted in figure 1, the frequency spectrum of whole license is divided into four frequency bands, and every four adjacent communities form a cluster (cluster), and each community therefore in cluster can be served by different frequency bands.In the middle of an example, base station BS 4 and base station BS 5 share identical frequency band #1, and service is positioned at the mobile station MS 6 of community 2 and the mobile station MS 7 being positioned at community 3 respectively.Result, when BS4 transmits a data-signal to communicate with MS6, BS5 also transmits a data-signal to MS7 simultaneously, but due to BS4 be transferred to MS6 signal be not the signal that receives desired by MS7 but transmit within the same frequency band, therefore this signal can cause interference to MS7.This interference signal reduces the Signal to Interference plus Noise Ratio (Signaltointerference-plus-noiseratio, hereinafter referred to as SINR) of mobile station MS 7, because this reducing overall service quality.Although this problem is by setting a less frequency duplex factor as one 1/K to zoom out (such as by the distance of interference source and receiving terminal, sqrt (3K) * R, wherein, R is radius of society) improve, but thus spendable radio resource can decline (such as, the licensed spectrum of 1/K) and cause the reduction of power system capacity in each community.

Compared with traditional frequency multiplexing method, multiplexing (the Fractionalfrequencyreuse of frequency division, hereinafter referred to as FFR) be proposed for cellular OFDMA system, to reach better balance (tradeoff) between power system capacity and service quality.Fig. 2 is the schematic diagram that the display of conventional art is used in the FFR of cellular OFDMA system 10.Cellular OFDMA system 10 comprises community 11, and community 11 is split into the 1st district and the 2nd district.1st district is positioned at comparatively close to the geographical position of serving BS BS12, and the 2nd district is then positioned at compared with the geographical position away from serving BS BS12.In addition, the radio-frequency spectrum of cellular OFDMA system 10 is split into frame district (framezone) #1 and frame district #2 in time domain.Under adaptability channeling technology, different frame districts is employed to serve from different frequency duplex factor as one the travelling carriage being positioned at different district.In the example in figure 2, the first frame district uses higher frequency duplex factor as one (that is: 1/K equals 1), and serve the 1st district, the second frame district then uses lower frequency duplex factor as one (that is: 1/K equals 1/3), serves the 2nd district.Therefore, the first frame district that the mobile station MS 17 being positioned at the 1st district equals 1 by base station BS 12 frequency of utilization multiplexing factor 1/K serves, and the second frame district that the mobile station MS 18 being positioned at the 2nd district equals 1/3 by base station BS 12 frequency of utilization multiplexing factor 1/K serves.Because mobile station MS 17 is positioned at comparatively close to the position at center, community 11, can suppose that it receives from the stronger data-signal of BS12 and the relatively weak interference signal from near-by interference source.On the other hand, because mobile station MS 18 is positioned at comparatively close to the position on border, community 11, can suppose its receive from the relatively weak data-signal of BS12 with from the relatively strong interference signal in near-by interference source.Therefore serving MS2 by using higher repetition factor (1/K) to serve MS1 with using lower repetition factor (1/K), between power system capacity and service quality, just can reach good balance.

Unfortunately, the FFR technology based on geographical position is not always effective.As shown in Figure 2, physical structure (physicalstructure) 14 intercepts between mobile station MS 18 and interference base station BS13.Therefore, interference base station BS13 transmits relatively strong interference signal 15 and also transmits relatively weak interference signal 16 to MS18 to MS17.As implied above, exist under the situation based on the frequency reuse mode of cell area, the MS17 being positioned at the 1st district is subject to but using higher 1/K to equal 1 from BS13 compared with strong jamming, and the MS18 being positioned at the 2nd district enjoys preferably service quality uses lower 1/K to equal 1/3.Therefore, based on geographical position FFR technology and under not being suitable for the situation of dynamic network.In radio communications system, that wants to maintain on line quality and power system capacity well balancedly must do kinetic measurement and disturb, and according to the result of interferometry to determine the action such as frequency reuse mode and radio resource configuration, these all still also exist sizable challenge.

Interferometry mechanism was once applied on traditional wireless communication system.Such as: traditional cellular frequency division multiple access access (as GSM) or code division multiple access system, transmitted by transceiver and receive narrow band signal.Because arrowband (narrowband) characteristic, frequency division multiple access system can only measured signal power or interference in the single time-frequency region in preset time.FDM systems cannot freely be measured in different time-frequency region, just can measure this is because the RF center frequency of FDM systems must correspondingly adjust.Relatively, in OFDMA system, transmitted and the signal receiving broadband by the transceiver possessing fast fourier transform (FastFourierTransfer) function.This OFDMA system can allow signal transmit easily and be received in the time-frequency region of specifying arbitrarily under wider channel width.Therefore, the transceiver of OFDMA system can when not changing RF center frequency, freely measured signal power or interference in the time-frequency region being different from the time-frequency region receiving data.This is OFDMA system and other traditional cellular frequency division multiple access system or the maximum difference of code division multiple access system.

Summary of the invention

Under adaptability channeling technology, the travelling carriage service of cellular OFDMA system uses the frequency reuse mode be applicable in different radio resource region, the capacity lowering the interference between community with this and promote system.In addition, adaptability channeling has coordinated radio resources allocation scheduling, power division, antenna configuration and the channelizing form in order to utilize the related optimization system of system resource to show further further.

First novel feature, moving table measuring interference statistics amount and obtain interference measurement results.Be required, be not required, spontaneous interferometry mechanism may be used for measurements interference statistic.Interference measurement results directly can be obtained by interference statistics amount, or indirectly through the calculating of interferometry statistic.Interference measurement results may comprise the form that interference power, signal interference ratio (signaltointerferenceratio, hereinafter referred to as SIR), SINR, the index in expression jamming station, the radio resource region index representing preference and non-preference or other SIR/SINR derive.In an embodiment, each travelling carriage is measurements interference statistic on given time and frequency measurement region, and serving BS not signal transmission in given time-frequency region.In another embodiment, each travelling carriage measurements interference statistic on given time and frequency measurement region, and serving BS signal transmission in given time-frequency region.Base station signal transmission in same given time-frequency region of serving BS and interference, and travelling carriage distinguishes the signal from serving BS and the signal from interference base station.Travelling carriage reports that the interference measurement results obtained is to serving BS or on-line file control unit subsequently.Serving BS or on-line file control unit determine adaptability frequency reuse mode by the interference measurement results received.

Second novel feature, the adaptability channeling of cellular OFDMA system is by coordinating to reach between on-line file control unit or the base station based on interference measurement results.In one embodiment, radio resource control unit receives interference measurement results, determines frequency reuse mode and configure radio resource based on interference measurement results.In another embodiment, base station obtains interference measurement results and links up interference measurement results with neighbor base station.Base station, by the coordination between base station, determines frequency reuse mode subsequently and configures radio resource by the interference measurement results obtained.

With the 3rd novel feature, base station obtains interference measurement results and the radio resource region of schedule mobile stations use and applicable frequency reuse mode.In descending channeling controls, base station receives interferometry statistic from travelling carriage.In up channeling controls, base station measurement interference statistics amount also obtains interference measurement results.Optimization system performance, with by the radio resource region service be applicable to, is carried out in base station subsequently schedule mobile stations.

Other embodiment and advantage are described in the following examples, and summary of the invention does not define the present invention.The present invention will be defined by right.

Accompanying drawing explanation

Fig. 1 is the community configuration diagram of the cellular OFDMA system of conventional art.

Fig. 2 is the schematic diagram being used in the FFR of cellular OFDMA system of conventional art.

Fig. 3 is the schematic diagram of the honeycomb OFDMA system according to one embodiment of the invention.

Fig. 4 is the flow chart that in cellular OFDMA system, result is disturbed in measurements interference statistic and report.

Fig. 5 is the schematic diagram being used in the requested interferometry mechanism in the community of cellular OFDMA system and not requested interferometry mechanism.

Fig. 6 is the schematic diagram of the spontaneous interferometry mechanism be used in the community of cellular OFDMA system.

Fig. 7 is the schematic diagram of the travelling carriage being positioned at cellular OFDMA system community.

Fig. 8 is the schematic diagram of the cellular OFDMA system of one embodiment of the invention.

Fig. 9 is the schematic diagram of the cellular OFDMA system of one embodiment of the invention.

Figure 10 is the applicating flow chart of the adaptation channeling of the cellular OFDMA system of one embodiment of the invention.

Figure 11 is the embodiment schematic diagram deciding antenna configuration in cellular OFDMA system according to the interference measurement results received.

Figure 12 is the embodiment schematic diagram deciding channelizing form in cellular OFDMA system according to the interference measurement results received.

Figure 13 is the schematic diagram of the cellular OFDMA system 80 of one embodiment of the invention.

Figure 14 is with the flow chart by suitable radio frequency regional service based on the result schedule mobile stations of interferometry.

Figure 15 is the schematic diagram based on interference measurement results schedule mobile stations in cellular OFDMA system 80.

Figure 16 A is based on interference measurement results application adaptability channeling and the schematic diagram by coordinating to carry out uplink power control between base station simultaneously.

Figure 16 B shows the schematic diagram based on the SINR of uplink power control.

Embodiment

Fig. 3 display is according to the schematic diagram of the honeycomb OFDMA system 20 of one embodiment of the invention.Honeycomb OFDMA system 20 comprises community 21, serving BS BS22 and is positioned at the multiple mobile station MS 23 in community 21, MS24, MS25.Each travelling carriage comprises transceiver 26, measurement module 27, analog baseband circuitry 28, digital baseband circuit 29 and internal memory 30.Cellular OFDMA system 20 using adaptability channeling (being also referred to as FFR) technology is to lower the interference of minizone.In the example of Fig. 3, in cellular OFDMA system 20, all obtainable frequency channels are cut into 3 different radio resource region #1, #2 and #3.Radio resource region is cut in time-domain or in frequency domain or the combination of time-domain and frequency domain.Each radio frequency region adopts a corresponding frequency duplex factor as one to serve the travelling carriage being positioned at community 21.According to a first aspect of the present invention, the interference measurement results that obtains based on itself of each travelling carriage being positioned at community 21 and being served by suitable frequency duplex factor as one.As shown in Figure 3, control for descending FFR, first each travelling carriage is measured its interference statistics amount (interferencestatistic) and is obtained interference measurement results in given time-frequency region.Interferometry statistic can by interference power, signal interference ratio (signaltointerferenceratio, hereinafter referred to as SIR), Signal to Interference plus Noise Ratio (signaltointerference-plus-noiseratio, hereinafter referred to as SINR) or some other interfere information represent.Interference measurement results directly can be obtained by interference statistics amount or is indirectly calculated by interference statistics amount.For example, the form that interferometry statistic result can be derived by the index (indexindicative) in interference power, SIR, SINR, expression jamming station, the radio resource region index representing preference (preferred) and non-preference (non-preferred) or other SIR/SINR represents.Each travelling carriage then reports that interference measurement results is to serving BS BS22.Based on the interference measurement results received, serving BS BS22 dispatches (schedule) each travelling carriage to be served with the radio resource region be applicable to by the radio resource region of correspondence, the performance online with this optimization and maximized system capacity.

Fig. 4 is cellular OFDMA system measurements interference statistic and the flow chart reporting interference statistics amount result.Wherein there is different interferometry mechanism (interferencemeasurementmechanism).In the middle of requested interferometry mechanism, first travelling carriage sends the request of interferometry to serving BS (step 31).After request, travelling carriage receives the instruction (step 32) of interferometry from serving BS.In step 34, travelling carriage measures its interference statistics amount in given time-frequency region, and obtains interference measurement results subsequently.Given time-frequency region is then indicated by interferometry provided.In last step 35, travelling carriage report interference measurement results is to serving BS.In the middle of not requested interferometry mechanism, travelling carriage does not transmit interferometry request.Contrary, serving BS directly indicates travelling carriage to perform interferometry.Travelling carriage then performs same step 34 and step 35, carrys out measurements interference statistic and reports that interference statistics amount result is to serving BS.In the middle of spontaneous interferometry mechanism (autonomousinterferencemeasurementmechanism), there is no interferometry request, do not have the interferometry of travelling carriage and base station communication to indicate yet.Contrary, travelling carriage receives the resource allocation information (step 33) of being broadcasted by serving BS.By to resource allocation information decoding, travelling carriage obtains the given time-frequency region that can make for doing interferometry.Its interference statistics amount then measured by travelling carriage according to identical step 34 and step 35, and reports that interference measurement results is to serving BS.

The requested interferometry mechanism that Fig. 5 display is used in the community 40 of cellular OFDMA system is machine-processed with not requested interferometry.Mobile station MS 42, MS43, be positioned at community 40 with MS44, and served by base station BS 41.In Figure 5, the downlink frame of community 40 is divided into N number of different frame district (frame district #1-#N) in time-domain.Under requested interferometry mechanism, mobile station MS 42, MS43 and MS44 first request service base station BS 41 indicate travelling carriage to measure their interference statistics amount.After serving BS receives request, indicate in the given time-frequency region of each travelling carriage in each frame district and perform interferometry.Under not requested interferometry mechanism, serving BS BS41 directly initiates interferometry and does not need to receive the request coming from travelling carriage.

In one embodiment, travelling carriage cannot be differentiated the signal received and comes from serving BS or other interference base station.Be more convenient for make the interferometry of travelling carriage carrying out, serving BS BS41 is data signal in given time-frequency region not.As a result, the total signal power that each travelling carriage receives in given time-frequency region equals always to receive interference power, therefore can measure easily.In another embodiment, travelling carriage can differentiate interference signal and data-signal, therefore can always receive interference power, SIR or SINR by surveying and calculating.For example, in a wireless communication system (as in global intercommunication microwave access (WiMAX) system), the targeting signal (pilotsignal) sent by each base station is interpreted into unique coding.Therefore, travelling carriage can utilize the targeting signal power received from serving BS to derive the interference power received from interference base station.

Fig. 6 display is used in the schematic diagram of the spontaneous interferometry mechanism in the community 40 of cellular OFDMA system.Serving BS BS41 periodically broadcast resource assignment information gives all travelling carriages being positioned at community 40.In one embodiment, mobile station MS 42, MS43 and MS44 to resource allocation information decoding, to obtain the time-frequency region not having signal transmission in each frame district of serving BS BS41.Then, the given time-frequency region in each frame district of each mobile assignment spontaneously carries out interferometry.For example, given time-frequency region is the subclass that a serving BS BS41 does not have the decoding time-frequency region of transmission signal.Another embodiment (not being shown in Fig. 6), which time-frequency region of suggest services base station BS 41 should be designated by each travelling carriage performs interferometry.

In cellular OFDMA system, many differences are had to utilize measurement module to measure the method for the interference statistics amount of travelling carriage.In the present invention, being used for the measurement module (such as, the measurement module 27 in Fig. 3) of measurements interference statistic can be the hardware of programmable or non-program, or embeds the software in the middle of travelling carriage.

Fig. 7 display is positioned at the schematic diagram of the various examples of the mobile station MS 42 measurements interference statistic of cellular OFDMA system community 40.Mobile station MS 42 served by serving BS BS41 in the example of fig. 7, and in the contiguous accessibility scope of interference base station BS45.As shown in Figure 7, if travelling carriage can differentiate data-signal and interference signal, so interference base station BS45 transmits interference signal 46 to while mobile station MS 42, and serving BS BS41 also data signal 47 can give mobile station MS 42.In the middle of first example, mobile station MS 42 obtains interference power by the reference signal power (such as, targeting signal power) measuring each base station, and reference signal power and total received power proportional.In the middle of second example, mobile station MS 42 receives interference signal 46 and identifies the pre-coding matrix index (precodingmatrixindex) that interference base station BS45 uses.In the 3rd example, mobile station MS 42 tells data-signal 47 and data-signal 46, and measures SIR or SINR that mobile station MS 42 receives.Signal comprises data carrier (datacarrier) and preamble carrier (pilotcarrier).

At moving table measuring after the statistic of interference signal, then can obtain corresponding interference measurement results.Interference measurement results can be identical with the interference statistics amount measured.Interference measurement results also can be calculated by interference statistics gauge indirectly.In one embodiment, interference measurement results is by identifying that the index of interference base station represents.If travelling carriage can identify the signal of certain interference base station from total interference signal received, then it then reports an index, and this index is relevant at least one base station of significantly disturbing of causing.For example, this index is related to minimum SINR, most strong jamming power or other interfere information.Specific interference base station is selected from (except serving BS) whole interference base stations by travelling carriage.In general, specific interference base station is selected by travelling carriage and returns.But in some cases, serving BS can indicate travelling carriage to report specific interference base station.

In the middle of another embodiment, interference measurement results is represented by the index of the radio resource region of identifiable design preference and non-preference, and wherein radio resource region based on measurements interference normalized set out.Because travelling carriage may also have sizable difference in the interference statistics amount of different time-frequency region, so travelling carriage can collect different interference statistics amounts by the interferometry repeating different time-frequency region.After different time-frequency region collects interference statistics amount, travelling carriage can the index of selective recognition preference or non-preference radio areas.Such as, the radio areas of preference can by the highest SINR or minimum interference power identification, and the radio areas of non-preference can by minimum SINR or the highest interference power identification.

Measured by the actual interference of travelling carriage and the interference measurement results that obtain can reflect dynamic network conditions, and, with estimated by geographical position or by more accurate compared with the interference power measured by above.Therefore, based on interference measurement results accurately, serving BS or other network element (as network operations, network controller or other similar unit) more effectively application adaptation channeling, reach the higher power system capacity required by 4G wireless communication system of future generation with this.

Wireless communication system using adaptability channeling technology of the present invention is also carried out optimization on line quality based on interference measurement results and improves power system capacity.Adaptability channeling is particularly suitable for cellular OFDMA system, because it is distributing running time-frequency resource to different districts having more elasticity.Under adaptability channeling technology, travelling carriage is scheduled in being served by different radio resource region and suitable frequency reuse mode.In addition, adaptability channeling further coordinate radio resources distribution, scheduling, power division, antenna configuration, system resource is related improves systematic function with using channelizing form to utilize further.In cellular OFDMA system, adaptability channeling can be reached by the coordination between the network control unit concentrated or base station.

Fig. 8 is the schematic diagram of the cellular OFDMA system 50 of one embodiment of the invention.Cellular OFDMA system 50 comprise centralized radio resource control unit 51, multiple unit 52-55, multiple serving BS BS56-59, with multiple travelling carriage.In Fig. 8 example, first centralized radio resource control unit 51 receives interference measurement results from base station BS 56-59 (or directly from travelling carriage).Subsequently, centralized radio resource control unit 51 decides frequency reuse mode according to the interference measurement results received and other network configuration index and configures radio resources allocation.

Fig. 9 is the schematic diagram of the cellular OFDMA system 50 of one embodiment of the invention.In the example of figure 9, serving BS BS56-59 first receives interference measurement results from travelling carriage.Serving BS BS56-59 intercoms to determine frequency reuse mode according to the interference measurement results received and other network configuration parameters subsequently mutually.In Fig. 9 example, the downlink frame of community 54 is split into three radio resource region, and its frequency duplex factor as one 1/K equals 1,1/2 and 1/4 respectively, carrys out three travelling carriages in Serving cell 54 with this.

Figure 10 is the applicating flow chart of the adaptability channeling of the cellular OFDMA system of one embodiment of the invention.If cellular OFDMA system has centralized radio resource control unit, so centralized radio resource control unit receives interference measurement results (step 61) from serving BS.Contrary, if do not have centralized radio resource control unit, so serving BS receives interference measurement results (step 62) from travelling carriage.In step 63, centralized radio resource control unit or serving BS determine frequency reuse mode according to the interference measurement results received.More particularly, following project can be determined: give the radio resource region number of each community, be used in the frequency duplex factor as one of each radio resource region, and for the time-frequency region of each radio resource region.In step 64, centralized radio resource control unit or serving BS are according to determined frequency reuse mode configuration radio resources allocation.More particularly, following project can be determined: the configuration (as beam pattern (beampattern), precoding vector) of the through-put power of each radio resource region, the antenna of each radio resource region and the channelizing form (queueing discipline as multiple community) of each radio resource region.

In order to make the decision of frequency reuse mode more convenient, travelling carriage is combined with corresponding frequency duplex factor as one to measure their interference statistics amount in different radio resource region.In one embodiment, its interference power of receiving in different radio resource area of each moving table measuring or SINR, and then report that the interference power of measurement or SINR are to its serving BS.Centralized radio resource control unit receives the interference power or SINR that measure, decides frequency reuse mode subsequently according to travelling carriage quantity in each community and each travelling carriage in the interfering frequency of different radio resource area or SINR.In one example in which, frequency reuse mode is determined, to make average interference power minimize, or by the interference power of each travelling carriage compared with predetermined threshold value (such as: the interference power of each travelling carriage is less than predetermined threshold value).In another example, determine frequency reuse mode, to make average SINR maximize, or by the SINR of each travelling carriage compared with predetermined threshold value (such as: the SINR of each travelling carriage is higher than predetermined threshold value).

Figure 11 shows cellular OFDMA system 50 decides an antenna configuration embodiment according to the interference measurement results received.In the middle of the example shown in Figure 11, base station BS 56 initially uses pre-coding matrix index #K to carry out mobile station MS68.Under adaptability channeling technology, mobile station MS 69 performs interferometry that serving BS BS57 asks and reports interference measurement results (such as, interference base station BS56 use pre-coding matrix index #K).Base station BS 57 subsequently with centralized radio resource control unit 51 Communication Jamming measurement result.Because mobile station MS 69 is very close to MS68, so MS69 is interfered the strong interference of pre-coding matrix index #K that base station BS 56 uses.As a result, the beam pattern that base station BS 57 asks base station BS 56 to change it by centralized radio resource control unit 51 reduces strong interference.

Figure 12 is shown in the embodiment deciding channelizing form in cellular OFDMA system 50 according to the interference measurement results received.In a local channel program (localizedchannelizationprocedure), the physics subcarrier of each logic channel is distributed in the regional area in frequency domain.The subcarrier arrangement of channelizing in different districts keeps identical.As a result, the interference coming from specific interference source may highly significant.In staggered channelizing program, the physics subcarrier of each logic channel crisscrosses in frequency domain.The physics subcarrier arrangement of the channelizing of different districts is different along with pseudo-random method.Therefore, the interference from certain interference source is randomized.In general, centralized radio resource control unit 51 interference that utilizes local channel method can coordinate between community.But, if interference is too dynamically difficult to coordinate, then then serving BS simply randomized transmission at all signals in particular radio resource region, to utilize interlace channel method to reach the effect of interference randomization.Interference measurement results contributes to the interference that cellular OFDMA system utilizes the channelization method of different channelization method or mixing to control or alleviates minizone.

Figure 13 is the schematic diagram of the cellular OFDMA system 80 of one embodiment of the invention.Cellular OFDMA system 80 comprises community 81, serves the serving BS BS82 of community 81, is positioned at the mobile station MS 83 of community 81 and MS84.Serving BS BS82 can in descending FFR controls receiving mobile interference measurement results or in up FFR controls oneself measurements interference statistic.Serving BS BS82 then can with the result schedule mobile stations of interferometry with by suitable radio frequency regional service.

Figure 14 is with the flow chart by suitable radio frequency regional service based on the result schedule mobile stations of interferometry.In descending FFR controls, serving BS indicates each travelling carriage given time-frequency region to be measured to its interference statistics amount (step 91) under different radio resource region.In step 92, serving BS receives the interference measurement results of each travelling carriage passback.Serving BS is dispatched each travelling carriage and is served by using the suitable radio resource region of corresponding frequency duplex factor as one, reaches optimization to make network performance.In up FFR controls, the interference statistics amount (step 93) of serving BS measurement itself.In step 94, serving BS and other base station or on-line file control unit Communication Jamming measurement result.In step 95, based on interference measurement results, adaptability frequency reuse mode is by serving BS itself or by coordinating between base station to determine.

The schematic diagram of data transmission scheduling of Figure 15 for doing based on interference measurement results in cellular OFDMA system 80, wherein Figure 15 is the radio resource figure for serving BS BS82, for the radio resource figure of interference base station BS85.Cellular OFDMA system 80 comprises the interference base station BS85 serving adjacent cell 81.In the middle of Figure 15 example, physical structure 86 is between mobile station MS 84 and interference base station BS85.If mobile station MS 83 uses high frequency duplex factor as one (1/K equals 1), and mobile station MS 84 uses low frequency duplex factor as one (1/K equals 1/3), the then high reject signal 87 that will receive from interference base station BS85 of mobile station MS 83, and mobile station MS 84 confiscates interference signal.Contrary, if mobile station MS 83 uses low frequency duplex factor as one (1/K equals 1/3), mobile station MS 84 uses high frequency duplex factor as one (1/K equals 1), then mobile station MS 83 does not receive the interference signal of interference base station BS85, and mobile station MS 84 also only receives interference signal 88 more weak after physical structure 86 intercepts.Therefore, the interference measurement results of serving BS BS82 is reported based on mobile station MS 83 and mobile station MS 84, the radio resource region that BS82 schedule mobile stations MS83 equals 1/3 to serve frequency duplex factor as one 1/K, and the radio resource region (as 98) that schedule mobile stations MS84 equals 1 to serve frequency duplex factor as one 1/K.Interference measurement results according to each travelling carriage determines that dynamic frequency is multiplexing, and radio resource can through effectively distributing the balance reached between high power system capacity and good service quality.

Figure 16 A is based on interference measurement results application adaptability channeling and the schematic diagram by coordinating to carry out uplink power control between base station simultaneously.If the target jamming noise ratio (InterferenceoverThermal of the radio resource region of other community, IoT) grade is low, the travelling carriage being then assigned to this radio resource region can be instructed to lower power delivery, to avoid the user affecting other community.On the other hand, if the target jamming noise ratio grade of the radio resource region of other community is high, then the travelling carriage being assigned to this radio resource region can allow with higher power delivery.In order to control system-wide interference, serving BS can be coordinated with other base station, the ratio of adjustresources segmentation and corresponding target jamming noise ratio grade.Similarly, Figure 16 B shows the schematic diagram based on the SINR of uplink power control, and wherein different target SINR grades specifies different radio resource region.

Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any the technical staff in the technical field, without departing from the scope of the present invention; can do some to change, the scope that therefore protection scope of the present invention should define with claim is as the criterion.

Claims (44)

1. be used to provide a method for interference measurement results, use at least one travelling carriage to carry out auxiliary cellular orthogonal frequency division multiple access system multiplexing with enables frequency, the method comprises:
A interferometry that () is received from serving BS by a travelling carriage indicates, and wherein, the instruction of this interferometry comprises given time-frequency region; B () uses this travelling carriage measurements interference statistic in this given time-frequency region, to obtain the interference measurement results in this cellular orthogonal frequency division multiple access system accordingly, wherein, this travelling carriage is positioned at the community that this serving BS is served; And
C () reports that this interference measurement results is to this serving BS.
2. the method being used to provide interference measurement results according to claim 1, it is characterized in that, this interference measurement results is derived by this interference statistics amount, and wherein this interference measurement results comprises interference power, signal interference ratio, Signal to Interference plus Noise Ratio, first index in expression jamming station or the second index of expression radio resource region.
3. the method being used to provide interference measurement results according to claim 1, it is characterized in that, b this measurement in () comprises: measure the signal power received from one or more jamming station in this given time-frequency region, wherein, this serving BS not signal transmission in this given time-frequency region.
4. the method being used to provide interference measurement results according to claim 1, it is characterized in that, b this measurement in () comprises: the reference signal power measuring one or more jamming station, and wherein, this serving BS is signal transmission in this time-frequency region.
5. the method being used to provide interference measurement results according to claim 1, it is characterized in that, b this measurement in () comprises: this travelling carriage is differentiated from the signal of this serving BS and the signal from one or more jamming station, wherein, this serving BS signal transmission in this given time-frequency region.
6. the method being used to provide interference measurement results according to claim 2, is characterized in that, this first index comprises one or more desired value, and this or the plurality of desired value are in order to represent one or more precoding vectors in this jamming station.
7. the method being used to provide interference measurement results according to claim 2, it is characterized in that, this second index comprises: in order to represent preference radio resource region desired value and in order to represent non-preference radio areas desired value at least one, wherein, this preference radio areas is defined by the highest Signal to Interference plus Noise Ratio or minimum interference power, and wherein this non-preference radio resource region is defined by minimum Signal to Interference plus Noise Ratio or the highest interference power.
8. the method being used to provide interference measurement results according to claim 1, is characterized in that, this given time-frequency region obtains according to the radio resource allocation information broadcasted from this serving BS.
9. the method being used to provide interference measurement results according to claim 8, is characterized in that, comprise further:
D () transmits interferometry request to this serving BS.
10. the method being used to provide interference measurement results according to claim 2, it is characterized in that, this community is divided into multiple different radio resource region, and wherein, this serving BS is served by the corresponding radio resource area with corresponding frequencies multiplexer mode.
11. methods being used to provide interference measurement results according to claim 10, is characterized in that, this interference statistics amount is measured in the plurality of different radio resource region by this travelling carriage and obtains.
12. methods being used to provide interference measurement results according to claim 10, is characterized in that, this interference statistics amount is used for adaptability channeling, and wherein, this frequency reuse mode determines by comparing this interference power and threshold value.
13. methods being used to provide interference measurement results according to claim 10, is characterized in that, this interference statistics amount is used for adaptability channeling, and wherein this frequency reuse mode determines by comparing this Signal to Interference plus Noise Ratio and threshold value.
14. 1 kinds of travelling carriages being used to provide interference measurement results, auxiliary cellular orthogonal frequency division multiple access system is multiplexing with enables frequency, and this travelling carriage comprises:
Transceiver, the interferometry received from serving BS indicates, and obtains given time-frequency region from the instruction of this interferometry; And
Measurement module, this measurement module, in this cellular orthogonal frequency division multiple access system, in the time-frequency region measurements interference statistic that this is given, and obtains interference measurement results accordingly, and wherein, this travelling carriage reports that this interference measurement results is to this serving BS.
15. travelling carriages being used to provide interference measurement results according to claim 14, it is characterized in that, this interference measurement results is derived by this interference statistics amount and obtains, wherein, this interference measurement results comprises interference power, signal interference ratio, Signal to Interference plus Noise Ratio, first index in expression jamming station or the second index of expression radio resource region.
16. travelling carriages being used to provide interference measurement results according to claim 14, is characterized in that, this measurement module measures this interference statistics amount in this given time-frequency region, and wherein, this serving BS is signal transmission in this time-frequency region not.
17. travelling carriages being used to provide interference measurement results according to claim 14, it is characterized in that, this measurement module measures this interference statistics amount in this given time-frequency region, and wherein, at this serving BS in this given time-frequency region during transmission signal, this measurement module identifies at least one interference signal from certain interference platform further.
18. travelling carriages being used to provide interference measurement results according to claim 14, it is characterized in that, this measurement module comprises programmable software modules.
19. 1 kinds of methods configuring radio resource, comprise:
A () sends interferometry by serving BS and is indicated to travelling carriage, wherein, the instruction of this interferometry comprises given time-frequency region;
B () obtains the multiple interference measurement results of this travelling carriage in this given time-frequency region being positioned at the community of cellular orthogonal frequency division multiple access system; And
C () basis at least partially the plurality of interference measurement results determines frequency reuse mode, and the radio resources allocation that configuration is corresponding.
The method of 20. configuration radio resources according to claim 19, is characterized in that, the frame of each community is divided into multiple radio resource region, and wherein, each travelling carriage is served by the corresponding radio resource area with corresponding frequencies multiplexer mode.
The method of 21. configuration radio resources according to claim 19, is characterized in that, the frequency reuse mode being decided by (c) depends on the comparative result of the interference power that this travelling carriage receives and predetermined threshold value.
The method of 22. configuration radio resources according to claim 19, is characterized in that, the frequency reuse mode being decided by (c) depends on the comparative result of the Signal to Interference plus Noise Ratio that this travelling carriage receives and predetermined threshold value.
The method of 23. configuration radio resources according to claim 20, it is characterized in that, should determine in (c) that the step of frequency reuse mode comprised: the quantity and the size that determine the radio resource region of each community, and determine the frequency duplex factor as one of each radio resource region.
The method of 24. configuration radio resources according to claim 20, is characterized in that, should determine that the step of frequency reuse mode comprised: definition is used for the time-frequency region of each radio resource region in adjacent cell with synchronization in (c).
The method of 25. configuration radio resources according to claim 20, is characterized in that, the step of this radio resources allocation of configuration should comprise: the through-put power determining each radio resource region in (c).
The method of 26. configuration radio resources according to claim 20, is characterized in that, the step of this radio resources allocation of configuration should comprise: the antenna configuration determining each radio resource region in (c).
The method of 27. configuration radio resources according to claim 20, is characterized in that, the step of this radio resources allocation of configuration should comprise: the channelizing form determining each radio resource region in (c).
The method of 28. configuration radio resources according to claim 19, it is characterized in that, should determine in (c) that this frequency reuse mode was performed by the centralized radio resource control unit of this cellular orthogonal frequency division multiple access system with the step of this radio resources allocation of configuration.
The method of 29. configuration radio resources according to claim 19, it is characterized in that, the step that should determine this frequency reuse mode in (c) and configure this radio resources allocation be by this cellular orthogonal frequency division multiple access system in coordination between neighbor base station perform.
30. 1 kinds of cellular orthogonal frequency division multiple access systems, comprise:
Multiple travelling carriage, the interferometry received from serving BS indicates, and the instruction of this interferometry comprises given time-frequency region, and the plurality of travelling carriage is measured multiple interference statistics amount in this given time-frequency region and obtains multiple interference statistics amount result accordingly; And
Network element, receives the plurality of interference measurement results, and wherein, this network element decides multiple frequency reuse mode radio resources allocation corresponding to configuration according to the plurality of interference measurement results received at least partially.
31. cellular orthogonal frequency division multiple access systems according to claim 30, is characterized in that, this network element is the centralized radio resource unit of this cellular orthogonal frequency division multiple access system.
32. cellular orthogonal frequency division multiple access systems according to claim 30, it is characterized in that, the plurality of travelling carriage served by serving BS, and wherein, this serving BS comprises this network element receiving the plurality of interference measurement results and determine this frequency reuse mode.
33. cellular orthogonal frequency division multiple access systems according to claim 30, it is characterized in that, the plurality of travelling carriage served by multiple serving BS, wherein, each serving BS receives the plurality of interference measurement results by the coordination between multiple neighbor base station and determines the plurality of frequency reuse mode.
The method of 34. 1 kinds of data transmission schedulings, comprises:
A () sends interferometry instruction by the base station in cellular orthogonal frequency division multiple access system, instruction travelling carriage measurements interference statistic in given time-frequency region;
B () obtains interference measurement results by this base station in cellular orthogonal frequency division multiple access system; And
C () according to this interference measurement results obtained at least partially, dispatches this travelling carriage to be served by radio resource region.
The method of 35. data transmission schedulings according to claim 34, is characterized in that, the data of this travelling carriage be sent to be divided into multiple radio resource region community in, wherein each radio resource region uses corresponding frequency reuse mode.
The method of 36. data transmission schedulings according to claim 34, is characterized in that, the step that should obtain interference measurement results in (b) comprise: receive this interference measurement results from travelling carriage belonging to these data.
The method of 37. data transmission schedulings according to claim 34, is characterized in that, the step that should obtain interference measurement results in (b) comprises: by this base station measurement interference statistics amount, and obtain this interference measurement results accordingly.
The method of 38. data transmission schedulings according to claim 34, it is characterized in that, the step of this travelling carriage of scheduling should comprise in (c): the data of dispatching this travelling carriage transmitted via this radio resource region, to make the reception interference power of this travelling carriage lower than predetermined threshold value.
The method of 39. data transmission schedulings according to claim 34, it is characterized in that, the step of this travelling carriage of scheduling should comprise in (c): the data of dispatching this travelling carriage transmitted via this radio resource region, to make the Signal to Interference plus Noise Ratio of this travelling carriage higher than predetermined threshold value.
The method of 40. data transmission schedulings according to claim 34, is characterized in that, comprise further:
This serving BS is transmission signal in this given time-frequency region not.
The method of 41. data transmission schedulings according to claim 34, is characterized in that, comprise further:
D () communicates with the neighbor base station of this cellular orthogonal frequency division multiple access system this interference measurement results.
42. 1 kinds of cellular orthogonal frequency division multiple access systems, comprise:
Travelling carriage, the interferometry received from serving BS indicates, and wherein the instruction of this interferometry comprises a given time-frequency region; And
This serving BS, obtains the interference measurement results in this given time-frequency region, and based on this interference measurement results at least partially, dispatches the data of this travelling carriage to be transmitted by radio resource region.
43. cellular orthogonal frequency division multiple access systems according to claim 42, is characterized in that, this moving table measuring interference statistics amount, and obtain this interference measurement results accordingly, and wherein, this serving BS receives this interference measurement results from this travelling carriage.
44. cellular orthogonal frequency division multiple access systems according to claim 42, is characterized in that, this serving BS measurements interference statistic also obtains this interference measurement results accordingly.
CN200880001723.6A 2007-10-16 2008-10-16 The interferometry mechanism that cellular orthogonal frequency division multiple access system medium frequency is multiplexing CN102783165B (en)

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US12/287,925 US8259601B2 (en) 2007-10-16 2008-10-15 Interference measurement mechanism for frequency reuse in cellular OFDMA systems
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