CN102783165A - Interference measurement mechanism for frequency reuse in cellular ofdma systems - Google Patents
Interference measurement mechanism for frequency reuse in cellular ofdma systems Download PDFInfo
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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
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- 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
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- 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
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- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
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- 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
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
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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
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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Abstract
Under adaptive frequency reuse technique, mobile stations in a cellular orthogonal frequency division multiple access (OFDMA) system are served by different radio resource regions with appropriate frequency reuse patterns to mitigate inter-cell interference and improve system capacity. In a first novel aspect, the mobile stations measure interference statistics and obtain interference measurement results. The mobile stations report the obtained interference measurement results to serving base stations. The serving base stations determine adaptive frequency reuse patterns based on the received interference measurement result. In a second novel aspect, a radio resource control element receives the interference measurement results, determines frequency reuse patterns and configures radio resource allocation based on the received interference measurement results. In a third novel aspect, the base stations obtain the interference measurement results and schedule the mobile stations to be served with appropriate radio resource regions.
Description
Technical field
The invention relates to that cellular OFDM inserts (Orthogonal FrequencyDivision Multiple Access; Hereinafter to be referred as OFDMA) system, and particularly machine-processed relevant for the interferometry of adaptability channeling (adaptive frequency reuse).
Background technology
In mobile radio system, channeling is an important techniques, and it promotes the capacity of whole system through reusing rare Radio Spectrum Resource (radio spectrum resource).Yet the enhancement of power system capacity but can cause on line quality to worsen because of the interference strength of following rises.Under cellular OFDMA system,, thereby there is not the inner interference (intra-cell interference) in unit because different users's signal can be kept quadrature when transmission.Yet,, reuse radio-frequency spectrum (just: channeling) will cause interference (inter-cell interference) between the unit because identical frequency band also can be reused by the base station of adjacent unit.
Fig. 1 is the unit structure sketch map of the cellular OFDMA system 1 of conventional art.Cellular OFDMA system 1 comprises a cellular construction, and the frequency duplex factor as one of this element structure (frequencyreuse factor) 1/K equals 1/4.The number of unit that can not share same frequency band during frequency duplex factor as one 1/K representative transmission.In example shown in Figure 1, the frequency spectrum of whole permission is divided into four frequency bands, and a cluster (cluster) is formed in per four adjacent unit, so each unit in the cluster can be served by different frequency bands.In the middle of an example, base station BS 4 is shared identical frequency band # 1 with base station BS 5, and service is positioned at the mobile station MS 6 and the mobile station MS 7 that is positioned at unit 3 of unit 2 respectively.The result; When data-signal of BS4 transmission when communicating by letter with MS6; BS5 has also transmitted a data-signal simultaneously and has given MS7, but because the signal of MS6 that BS4 is transferred to is not the desired signal of receiving of MS7 but is transmitted in the identical frequency band, so this signal can cause interference to MS7.This interference signal has reduced the Signal to Interference plus Noise Ratio (Signal to interference-plus-noise ratio is hereinafter to be referred as SINR) of mobile station MS 7, has therefore reduced whole service quality.Though this problem can (for example zoom out with the distance with interference source and receiving terminal through setting a less frequency duplex factor as one 1/K; Sqrt (3K) * R; Wherein, R is a cell radius) improve, but spendable radio resource can thereby descend (for example, the licensed spectrum of 1/K) and causes the reduction of power system capacity in each unit.
Compare with traditional frequency multiplexing method, frequency division multiplexing (Fractional frequency reuse is hereinafter to be referred as FFR) has been suggested and has been used for cellular OFDMA system, between power system capacity and service quality, to reach better balance (tradeoff).The sketch map of Fig. 2 FFR of cellular OFDMA system 10 for the demonstration of conventional art is used in.Cellular OFDMA system 10 comprises unit 11, and unit 11 is split into the 1st district and the 2nd district.The 1st district is positioned at than the geographical position near serving BS BS12, and the 2nd district then is positioned at than the geographical position away from serving BS BS12.In addition, the radio-frequency spectrum of cellular OFDMA system 10 is split into frame district (frame zone) #1 and frame district # 2 on time domain.Under adaptability channeling technology, different frame districts is employed the travelling carriage that is positioned at different districts with service with different frequency duplex factor as one.In the example of Fig. 2, the first frame district uses higher frequency duplex factor as one (that is: 1/K equals 1), serves the 1st district, and 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 mobile station MS 17 that is positioned at the 1st district equals 1 the first frame district by the multiplexing factor 1/K of base station BS 12 frequencies of utilization serves, and serves and the mobile station MS 18 that is positioned at the 2nd district equals 1/3 the second frame district by the multiplexing factor 1/K of base station BS 12 frequencies of utilization.Because mobile station MS 17 is positioned at than the position near 11 centers, unit, can suppose that its reception reaches the relative more weak interference signal from the near-by interference source from the stronger data-signal of BS12.On the other hand, because mobile station MS 18 is positioned at than the position near 11 borders, unit, can suppose that its receives from the relative more weak data-signal of BS12 and from the relative stronger interference signal in near-by interference source.Therefore serve MS2 through using higher repetition factor (1/K) to serve MS1 with using lower repetition factor (1/K), just can reach good balance between power system capacity and the service quality.
Unfortunately, the FFR technology based on the geographical position is not always effective.As shown in Figure 2, physical structure (physical structure) 14 intercepts between mobile station MS 18 and interference base station BS13.Therefore, interference base station BS13 transmits stronger relatively interference signal 15 and gives MS18 to MS17 and the more weak relatively interference signal 16 of transmission.As implied above; Under the situation of existence based on the frequency reuse mode of unit area; The MS17 that is positioned at the 1st district receive from BS13 but use higher 1/K to equal 1 than strong jamming, and the MS18 that is positioned at the 2nd district enjoys preferable service quality and uses low 1/K to equal 1/3.Therefore, based on the FFR in geographical position technology and be not suitable under the situation of dynamic network.In the radio communications system; The well balanced of wanting to keep on line quality and power system capacity must be done the kinetic measurement interference; And according to the result of interferometry with actions such as decision frequency reuse mode and radio resource configuration, these all still exist sizable challenge.
Interferometry mechanism once was applied on traditional wireless communication system.For example: traditional cellular frequency division multiple access inserts (like GSM) or code division multiple access system, transmits the band signal narrow with reception by transceiver.Because arrowband (narrowband) characteristic, frequency division multiple access system can only the single time-frequency region in preset time on measured signal power or interference.The frequency division multi-task system can't freely measure in different time-frequency region, and this is because the radio frequency centre frequency of frequency division multi-task system must correspondingly be adjusted just and can measure.Relatively, in the OFDMA system, transmit and receive the signal in broadband through possessing fast fourier transform (Fast FourierTransfer) transceiver of function.This OFDMA system can let signal transmit and the time-frequency region that is received in any appointment under the channel width of broad easily.Therefore, the transceiver of OFDMA system can be under the situation that does not change the radio frequency centre frequency, measured signal power or interference freely in the time-frequency region that is different from the time-frequency region that receives 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 in different radio resource region, is lowered interference and the capacity of promoting system unit between with this with the frequency reuse mode that is fit to.In addition, the adaptability channeling has further been coordinated radio resources allocation scheduling, power division, antenna configurations and the channelizing form in order further to utilize the related optimization system of system resource to show.
First novel feature, moving table measuring interference statistics amount and obtain interference measurement results.That be asked to, that be not asked to, spontaneous interferometry mechanism can be used to measure the interference statistics amount.Interference measurement results can directly be obtained by the interference statistics amount, or passes through the calculating of interferometry statistic indirectly.Interference measurement results possibly comprise the form that the index in interference power, signal interference ratio (signal to interference ratio is hereinafter to be referred as SIR), SINR, expression jamming station, the radio resource region index of representing preference and non-preference or other SIR/SINR derive.In an embodiment, each travelling carriage is measured the interference statistics amount on given time and frequency measurement zone, and serving BS transmission signals on given time-frequency region not.In another embodiment, each travelling carriage is measured the interference statistics amount on given time and frequency measurement zone, and serving BS transmission signals on given time-frequency region.The base station of serving BS and interference is transmission signals on same given time-frequency region, and travelling carriage is told from the signal of serving BS and signal from interference base station.Travelling carriage reports that subsequently the interference measurement results that obtains is to serving BS or on-line file control unit.Serving BS or on-line file control unit are by the interference measurement results decision adaptability frequency reuse mode of receiving.
Second novel feature, the adaptability channeling of cellular OFDMA system is reached through the on-line file control unit or based on coordinating between the base station of interference measurement results.In one embodiment, the radio resource control unit is received interference measurement results, decision frequency reuse mode and is disposed radio resource based on interference measurement results.In another embodiment, the base station obtains interference measurement results and links up interference measurement results with neighbor base station.The base station determines frequency reuse mode subsequently and disposes radio resource through the interference measurement results that obtains through the coordination between the base station.
With the 3rd novel feature, the base station obtains interference measurement results and dispatches radio resource region and the suitable frequency reuse mode that travelling carriage uses.In descending channeling control, the interferometry statistic is received from travelling carriage in the base station.In up channeling control, base station measurement interference statistics amount also obtains interference measurement results.Travelling carriage is dispatched subsequently with by the radio resource region service that is fit in the base station, comes the optimization system performance.
Other embodiment and advantage are described in following embodiment, and summary of the invention does not define the present invention.The present invention will be by the claim scope definition.
Description of drawings
Fig. 1 is the unit structure sketch map of the cellular OFDMA system of conventional art.
Fig. 2 is the sketch map of the FFR of the cellular OFDMA of being used in of conventional art system.
Fig. 3 is the sketch map according to the honeycomb OFDMA system of one embodiment of the invention.
Fig. 4 measures the flow chart that the result is disturbed in interference statistics amount and report in the cellular OFDMA system.
Fig. 5 is the sketch map that is used in requested interferometry mechanism and not requested interferometry mechanism in the unit of cellular OFDMA system.
Fig. 6 is the sketch map that is used in the spontaneous interferometry mechanism in the unit of cellular OFDMA system.
Fig. 7 is the sketch map that is positioned at the travelling carriage of cellular OFDMA system unit.
Fig. 8 is the sketch map of the cellular OFDMA system of one embodiment of the invention.
Fig. 9 is the sketch map of the cellular OFDMA system of one embodiment of the invention.
Figure 10 is the applicating flow chart of adaptation channeling of the cellular OFDMA system of one embodiment of the invention.
Figure 11 is for deciding the embodiment sketch map of antenna configurations according to the interference measurement results of receiving in the cellular OFDMA system.
Figure 12 is for deciding the embodiment sketch map of channelizing form according to the interference measurement results of receiving in the cellular OFDMA system.
Figure 13 is the sketch map of the cellular OFDMA system 80 of one embodiment of the invention.
Figure 14 dispatches travelling carriage with the flow chart by suitable radio frequency regional service for the result based on interferometry.
Figure 15 is based on the sketch mapes of interference measurement results scheduling travelling carriage in the cellular OFDMA system 80.
Figure 16 A is for carrying out the sketch map of uplink power control based on interference measurement results while application adaptability channeling and through coordination between the base station.
Figure 16 B shows the sketch map based on the SINR of uplink power control.
Embodiment
Fig. 3 shows the sketch map according to the honeycomb OFDMA system 20 of one embodiment of the invention.Honeycomb OFDMA system 20 comprises unit 21, serving BS BS22 and is positioned at a plurality of mobile station MS in unit 21 23, 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 uses adaptability channeling (also being called as FFR) technology to lower the interference between the unit.In the example of Fig. 3, all obtainable frequency channels are cut into 3 different radio resource region # 1, #2 and #3 in the cellular OFDMA system 20.Radio resource region is cut in time-domain or combining in frequency domain or time-domain and frequency domain.Each radio frequency zone adopts a corresponding frequency duplex factor as one to serve the travelling carriage that is positioned at unit 21.According to first aspect present invention, each is positioned at the interference measurement results that the travelling carriage of unit 21 obtains based on itself and is served by suitable frequency duplex factor as one.As shown in Figure 3, for descending FFR control, each travelling carriage is at first measured its interference statistics amount (interference statistic) and is obtained interference measurement results on given time-frequency region.The interferometry statistic can be by interference power, signal interference ratio (signal to interference ratio; Hereinafter to be referred as SIR), other interfere information of Signal to Interference plus Noise Ratio (signal to interference-plus-noise ratio is hereinafter to be referred as SINR) or some representes.Interference measurement results can directly be obtained or calculated by the interference statistics amount indirectly by the interference statistics amount.For instance, interferometry statistic result can be represented with the radio resource region index of not preferred (non-preferred) or the form of other SIR/SINR derivation by index (index indicative), the expression preferred (preferred) in interference power, SIR, SINR, expression jamming station.Each travelling carriage reports that then interference measurement results gives serving BS BS22.Based on the interference measurement results of receiving, information desk BS22 scheduling (schedule) each travelling carriage is to be served with the radio resource region that is fit to by the radio resource region of correspondence, with this optimization online performance and maximized system capacity.
Fig. 4 is cellular OFDMA systematic survey interference statistics amount and the flow chart of reporting interference statistics amount result.Different interferometry mechanism (interference measurement mechanism) is wherein arranged.In the middle of requested interferometry mechanism, travelling carriage at first sends the request of interferometry and gives serving BS (step 31).After the request, travelling carriage receives the indication (step 32) of interferometry from serving BS.In step 34, travelling carriage is measured its interference statistics amount in given time-frequency region, and obtains interference measurement results subsequently.Given time-frequency region then is to be provided by the interferometry indication.In last step 35, travelling carriage report interference measurement results is given serving BS.In the middle of not requested interferometry mechanism, travelling carriage does not transmit the interferometry request.Opposite, serving BS directly indicates travelling carriage to carry out interferometry.Travelling carriage is then carried out same step 34 and step 35, measures the interference statistics amount and reports that interference statistics amount result gives serving BS.In the middle of spontaneous interferometry mechanism (autonomous interferencemeasurement mechanism), there is not the interferometry request, there is not the interferometry indication of travelling carriage and base station communication yet.Opposite, travelling carriage receives the resource allocation information (step 33) of being broadcasted by serving BS.Through resource allocation information is deciphered, travelling carriage obtains to make the given time-frequency region that is used for doing interferometry.Travelling carriage is then measured its interference statistics amount according to identical step 34 and step 35, and the report interference measurement results is given serving BS.
Fig. 5 shows the requested interferometry mechanism and not requested interferometry mechanism in the unit 40 be used in cellular OFDMA system.Mobile station MS 42, MS43, be positioned at unit 40, and serve by base station BS 41 with MS44.In Fig. 5, the downlink frame of unit 40 is divided into N different frame district (frame district #1-#N) in time-domain.Under requested interferometry mechanism, mobile station MS 42, MS43 and MS44 at first ask serving BS BS41 indication travelling carriage to measure their interference statistics amount.After serving BS is received request, indicate on the given time-frequency region of each travelling carriage in each frame district and carry out interferometry.Under not requested interferometry mechanism, serving BS BS41 directly initiates interferometry and need not receive the request that comes from travelling carriage.
In one embodiment, travelling carriage can't be differentiated the signal that receives and comes from serving BS or other interference base station.Be more convenient for carrying out for the interferometry that makes travelling carriage, serving BS BS41 is data signal on given time-frequency region not.As a result, the total signal power that each travelling carriage is received on given time-frequency region equals always to receive interference power, therefore can measure easily.At another embodiment, travelling carriage can be differentiated interference signal and data-signal, therefore can measure and calculate total reception interference power, SIR or SINR.For instance, in wireless communication system (in global intercommunication microwave access (WiMAX) system), the targeting signal (pilot signal) that is sent by each base station is interpreted into unique coding.Therefore, travelling carriage can utilize the targeting signal power of receiving from serving BS to derive the interference power of receiving from interference base station.
Fig. 6 shows the sketch map of the spontaneous interferometry mechanism in the unit 40 be used in cellular OFDMA system.Serving BS BS41 periodically broadcast resource assignment information is positioned at the travelling carriage of unit 40 to all.In one embodiment, mobile station MS 42, MS43 and MS44 decipher resource allocation information, to obtain not have in each frame district of serving BS BS41 the time-frequency region of transmission signals.Then, each travelling carriage distributes the given time-frequency region in each frame district spontaneously to carry out interferometry.For instance, given time-frequency region is the subclass that a serving BS BS41 does not transmit the decoding time-frequency region of signal.Another embodiment (not being shown in Fig. 6), each travelling carriage should designatedly be carried out interferometry with suggest services base station BS 41 which time-frequency region.
In cellular OFDMA system, there are many differences to utilize measurement module to measure the method for the interference statistics amount of travelling carriage.In the present invention, the measurement module (for example, the measurement module 27 among Fig. 3) that is used for measuring the interference statistics amount can be the programmable or the hardware of programmable not, or embeds the software in the middle of the travelling carriage.
Fig. 7 shows the sketch map of the various examples of the mobile station MS 42 measurement interference statistics amounts that are positioned at cellular OFDMA system unit 40.Mobile station MS 42 is 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 be differentiated data-signal and interference signal, when interference base station BS45 transmits interference signal 46 and gives mobile station MS 42 so, but serving BS BS41 also data signal 47 give mobile station MS 42.In the middle of first example, mobile station MS 42 obtains interference power through the reference signal power (for example, targeting signal power) of measuring each base station, and reference signal power and total received power are proportional.In the middle of second example, mobile station MS 42 receives interference signal 46 and discerns the employed pre-coding matrix index of interference base station BS45 (precoding matrix index).In the 3rd example, mobile station MS 42 is told data-signal 47 and data-signal 46, and measures SIR or the SINR that mobile station MS 42 is received.Signal comprises data carrier (data carrier) and preamble carrier (pilot carrier).
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 of measuring.Interference measurement results also can be calculated by the interference statistics amount indirectly.In one embodiment, interference measurement results is represented by the index of identification interference base station.If travelling carriage can be discerned the certain interference signal of base station from the interference signal of total reception, then it then reports an index, and this index is relevant with at least one base station of significantly disturbing of causing.For instance, this index is concerning minimum SINR, strong jamming power or other interfere information.Specific interference base station is selected by travelling carriage (except serving BS) from whole interference base stations.In general, specific interference base station is to be selected and repaid by travelling carriage.But in some cases, serving BS can be indicated the specific interference base station of travelling carriage report.
In the middle of another embodiment, interference measurement results represented by the index that can discern preferred and not preferred radio resource region, and wherein radio resource region is based on and measures that the interference statistics amount calculates.Because travelling carriage possibly also have sizable difference in the interference statistics amount of different time-frequency region, so travelling carriage can be collected different interference statistics amounts through the interferometry that repeats different time-frequency region.After different time-frequency region were collected the interference statistics amount, travelling carriage can select to discern the index of preferred or not preferred radio areas.For example, preferred radio areas can be by the highest SINR or minimum interference power identification, and not preferred radio areas can be by minimum SINR or the highest interference power identification.
By the actual interference of travelling carriage measure and interference measurement results can reflect the dynamic network situation, and, with estimated by the geographical position or compare by the measured interference power of preamble more accurate.Therefore; Based on interference measurement results accurately; Serving BS or other NE (like network operations, network controller or other similar unit) be the application adaptation channeling more effectively, reaches the desired higher power system capacity of 4G wireless communication system of future generation with this.
Wireless communication system of the present invention uses adaptability channeling technology and comes the optimization on line quality and improve power system capacity based on interference measurement results.The adaptability channeling is particularly suitable for cellular OFDMA system, because it is distributing running time-frequency resource to have more elasticity on to different units.Under adaptability channeling technology, travelling carriage is scheduled in being served by different radio resource region and suitable frequency reuse mode.In addition, further coordinate radio resources distribution of adaptability channeling, scheduling, power division, antenna configurations, come further to utilize the related systematic function of improving of system resource with using the channelizing form.In cellular OFDMA system, the adaptability channeling can be reached by network control unit of concentrating or the coordination between the base station.
Fig. 8 is the sketch map of the cellular OFDMA system 50 of one embodiment of the invention.Cellular OFDMA system 50 comprise centralized radio resource control unit 51, a plurality of unit 52-55, a plurality of serving BS BS56-59, with a plurality of travelling carriages.In Fig. 8 example, centralized radio resource control unit 51 at first 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 and disposes radio resources allocation according to interference measurement results and other network configuration index received.
Fig. 9 is the sketch map of the cellular OFDMA system 50 of one embodiment of the invention.In the example of Fig. 9, serving BS BS56-59 receives interference measurement results from travelling carriage earlier.Serving BS BS56-59 intercoms with the decision frequency reuse mode according to the interference measurement results of receiving and other network configuration parameters subsequently mutually.In Fig. 9 example, the downlink frame of unit 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, comes three travelling carriages in the service unit 54 with this.
Figure 10 is the applicating flow chart of adaptability channeling of the cellular OFDMA system of one embodiment of the invention.If there is centralized radio resource control unit in cellular OFDMA system, so centralized radio resource control unit receives interference measurement results (step 61) from serving BS.Opposite, if there is not centralized radio resource control unit, serving BS receives interference measurement results (step 62) from travelling carriage so.In step 63, centralized radio resource control unit or serving BS are according to the interference measurement results decision frequency reuse mode of receiving.More particularly, following project can be determined: give each unit the radio resource region number, be used in the frequency duplex factor as one of each radio resource region, and the time-frequency region that is used for 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 channelizing form (like the queueing discipline of a plurality of unit) of the through-put power of each radio resource region, the arrangement of antennas of each radio resource region (like beam pattern (beam pattern), precoding vector) and each radio resource region.
More convenient for the decision that makes frequency reuse mode, travelling carriage is cooperating the multiplexing factor of correspondent frequency to measure their interference statistics amount in different radio resource region.In one embodiment, its interference power or SINR of on the different radio resource area, receiving of each moving table measuring, and then the interference power or the SINR that measure of report gives its serving BS.Centralized radio resource control unit is received interference power or the SINR that measures, and decides frequency reuse mode according to travelling carriage quantity in each unit and each travelling carriage at the interfering frequency or the SINR of different radio resource area subsequently.In an example, the decision frequency reuse mode so that average interference power minimizes, or is compared (for example: the interference power of each travelling carriage is less than predetermined threshold value) with the interference power of each travelling carriage with predetermined threshold value.In another example, the decision frequency reuse mode so that average SINR maximization, or is compared (for example: the SINR of each travelling carriage is higher than predetermined threshold value) with the SINR of each travelling carriage with predetermined threshold value.
Figure 11 shows that cellular OFDMA system 50 decides an embodiment of antenna configurations according to the interference measurement results of receiving.In the middle of example shown in Figure 11, the base station BS 56 initial pre-coding matrix index #K that use serve mobile station MS 68.Under adaptability channeling technology, mobile station MS 69 is carried out the interferometry of serving BS BS57 request and is reported interference measurement results (for example, the employed pre-coding matrix index of interference base station BS56 #K).Base station BS 57 subsequently with centralized radio resource control unit 51 Communication Jamming measurement results.Because mobile station MS 69 is very near MS68, so, the MS69 strong interference of base station BS 56 employed pre-coding matrix index #K that is interfered.As a result, base station BS 57 asks base station BS 56 its beam patterns of change to reduce strong interference through centralized radio resource control unit 51.
Figure 12 is shown in the cellular OFDMA system 50 embodiment that decides the channelizing form according to the interference measurement results of receiving.In a local channel program (localized channelizationprocedure), the physics subcarrier of each logic channel is distributed in the regional area in the frequency domain.The subcarrier of channelizing is arranged and is kept identical in the different units.As a result, the interference possibility highly significant that comes from specific interference source.In staggered channelizing program, the physics subcarrier of each logic channel crisscrosses in the frequency domain.The physics subcarrier of the channelizing of different units is arranged different along with pseudo-random method.Therefore, from the interference in certain interference source by randomization.In general, centralized radio resource control unit 51 utilizes the interference of local channel method between can coordination unit.Yet, too dynamically be difficult to coordinate if disturb, then serving BS simply randomization be transmitted in all signals in particular radio resource zone, reach the effect of interference randomization to utilize staggered channelizing method.Interference measurement results helps cellular OFDMA system to utilize the channelizing method of different channelizing methods or mixing to control or alleviates the interference between the unit.
Figure 13 is the sketch map of the cellular OFDMA system 80 of one embodiment of the invention.Cellular OFDMA system 80 comprises unit 81, serve the serving BS BS82 of unit 81, be positioned at the mobile station MS 83 and the MS84 of unit 81.Serving BS BS82 can be in descending FFR control receiving mobile interference measurement results or in up FFR control own measurement interference statistics amount.Serving BS BS82 then can dispatch travelling carriage with the result of interferometry with by suitable radio frequency regional service.
The result that Figure 14 is based on interferometry dispatches travelling carriage with the flow chart by suitable radio frequency regional service.In descending FFR control, each travelling carriage of serving BS indication is measured its interference statistics amount (step 91) to given time-frequency region under different radio resource region.In step 92, serving BS receives the interference measurement results of each travelling carriage passback.Each travelling carriage of serving BS scheduling is served by the suitable radio resource region of using corresponding frequency duplex factor as one, so that network performance reaches optimization.In up FFR control, 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, the adaptability frequency reuse mode is by serving BS itself or by coordinating decision between the base station.
Figure 15 is the sketch map of the data transmission scheduling done based on interference measurement results in the cellular OFDMA system 80, and wherein Figure 15 is the radio resource figure that is used for serving BS BS82, is used for the radio resource figure of interference base station BS85.Cellular OFDMA system 80 comprises the interference base station BS85 that serves adjacent unit 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); Then mobile station MS 83 will be received the high reject signal 87 from interference base station BS85, and mobile station MS 84 is confiscated interference signal.Opposite; 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 is not received the interference signal of interference base station BS85, and mobile station MS 84 is also only received through more weak interference signal 88 after physical structure 86 obstructs.Therefore; Report the interference measurement results of serving BS BS82 based on mobile station MS 83 and mobile station MS 84; BS82 scheduling mobile station MS 83 is serving the radio resource region that frequency duplex factor as one 1/K equals 1/3, and scheduling mobile station MS 84 is to serve the radio resource region (as 98) that frequency duplex factor as one 1/K equals 1.Interference measurement results decision dynamic frequency according to each travelling carriage is multiplexing, and radio resource can pass through effective distribution and reach the balance between high power system capacity and the good service quality.
Figure 16 A is for carrying out the sketch map of uplink power control based on interference measurement results while application adaptability channeling and through coordination between the base station.If the target interference-to-noise ratio of the radio resource region of other unit (Interference over Thermal; IoT) grade is low; The travelling carriage that then is assigned to this radio resource region can be by indication with lower power delivery, to avoid influencing the user of other unit.On the other hand, if the target interference-to-noise ratio grade of the radio resource region of other unit is high, the travelling carriage that then is 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 and the corresponding target interference-to-noise ratio grade of adjustment division of resources.Similarly, Figure 16 B shows the sketch map based on the SINR of uplink power control, and wherein different target SINR grades is specified different radio resource region.
Though the present invention discloses as above with preferred embodiment; Right its is not in order to qualification the present invention, and any affiliated those skilled in the art are not in departing from the scope of the present invention; Can do some and change, so protection scope of the present invention should be as the criterion with the scope that claim is defined.
Claims (48)
1. a method that is used to provide interference measurement results uses at least one travelling carriage to assist cellular orthogonal frequency division multiple access system with the activation channeling, and this method comprises:
(a) use this at least one travelling carriage on time-frequency region, to measure the interference statistics amount, to obtain the interference measurement results in this cellular orthogonal frequency division multiple access system in view of the above, wherein, this travelling carriage is positioned at the unit that serving BS is served; And
(b) report that this interference measurement results is to this serving BS.
2. the method that is 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 first index in interference power, signal interference ratio, Signal to Interference plus Noise Ratio, expression jamming station or second index of expression radio resource region.
3. the method that is used to provide interference measurement results according to claim 1; It is characterized in that; (a) this measurement in comprises: measure the signal power that on this time-frequency region, receives from one or more jammings station, wherein, this serving BS is transmission signals on this time-frequency region not.
4. the method that is used to provide interference measurement results according to claim 1 is characterized in that, this measurement in (a) comprises: measure the reference signal power in one or more jammings station, wherein, this serving BS is transmission signals on this time-frequency region.
5. the method that is used to provide interference measurement results according to claim 1; It is characterized in that; (a) this measurement in comprises: the signal that this travelling carriage is differentiated from this serving BS reaches the signal from one or more jammings station, and wherein, this serving BS is transmission signals on this time-frequency region.
6. the method that is used to provide interference measurement results according to claim 2 is characterized in that, this first index comprises one or more desired values, and this or these a plurality of desired values are in order to represent one or more precoding vectors in this jamming station.
7. the method that is used to provide interference measurement results according to claim 2; It is characterized in that; This second index comprises: in order to the desired value in expression preferred wireless electric resources zone and in order in the desired value of representing not preferred radio areas at least one; Wherein, This preferred wireless electricity zone is defined by the highest Signal to Interference plus Noise Ratio or minimum interference power, and wherein this not preferred radio resource region is by minimum Signal to Interference plus Noise Ratio or the highest interference power defines.
8. the method that is used to provide interference measurement results according to claim 1 is characterized in that, this time-frequency region obtains according to the radio resource allocation information of broadcasting from this serving BS.
9. the method that is used to provide interference measurement results according to claim 1 is characterized in that, further comprises:
(c) reception is from the interferometry indication of this serving BS, and wherein, this interferometry is pointed out the time-frequency region that this is given.
10. the method that is used to provide interference measurement results according to claim 9 is characterized in that, further comprises:
(d) transmit the interferometry request and give this serving BS.
11. the method that is used to provide interference measurement results according to claim 2; It is characterized in that; This unit is divided into a plurality of different radio resource region, and wherein, this information desk is served by the corresponding radio resource area with corresponding frequencies multiplexer mode.
12. the method that is used to provide interference measurement results according to claim 11 is characterized in that, this interference statistics amount is measured and is got in these a plurality of different radio resource region by this travelling carriage.
13. the method that is used to provide interference measurement results according to claim 11 is characterized in that, this interference statistics amount is used for the adaptability channeling, and wherein, this frequency reuse mode is through relatively this interference power and threshold value determine.
14. the method that is used to provide interference measurement results according to claim 11 is characterized in that, this interference statistics amount is used for the adaptability channeling, and wherein this frequency reuse mode through relatively this Signal to Interference plus Noise Ratio and threshold value determine.
15. a travelling carriage that is used to provide interference measurement results, auxiliary cellular orthogonal frequency division multiple access system is with the activation channeling, and this travelling carriage comprises:
Measurement module, this measurement module are measured the interference statistics amount in this cellular orthogonal frequency division multiple access system, and obtain interference measurement results in view of the above, and wherein, this this interference measurement results of travelling carriage report is given NE.
16. the travelling carriage that is used to provide interference measurement results according to claim 15; It is characterized in that; This interference measurement results is derived by this interference statistics amount and is got; Wherein, this interference measurement results comprises first index in interference power, signal interference ratio, Signal to Interference plus Noise Ratio, expression jamming station or second index of expression radio resource region.
17. the travelling carriage that is used to provide interference measurement results according to claim 15 is characterized in that, this NE is the serving BS of this travelling carriage of service.
18. the travelling carriage that is used to provide interference measurement results according to claim 17 is characterized in that, this measurement module is measured this interference statistics amount on given time-frequency region, and wherein, this serving BS is transmission signals on this time-frequency region not.
19. the travelling carriage that is used to provide interference measurement results according to claim 17; It is characterized in that; This measurement module is measured this interference statistics amount on given time-frequency region; And wherein, when this given time-frequency region was uploaded feed signals, this measurement module was further discerned at least one interference signal from the certain interference platform at this serving BS.
20. the travelling carriage that is used to provide interference measurement results according to claim 15 is characterized in that this measurement module comprises the programmable software module.
21. a travelling carriage comprises:
Transceiver; And
Measurement mechanism; This measurement mechanism is measured the interference statistics amount in cellular orthogonal frequency division multiple access system; And obtain interference measurement results in view of the above, wherein, this this interference measurement results of measurement mechanism report is given the NE of this cellular orthogonal frequency division multiple access system.
22. travelling carriage according to claim 21 is characterized in that, the serving BS of this this travelling carriage of NE service.
23. a method that disposes radio resource comprises:
(a) obtain to be positioned at a plurality of interference measurement results of travelling carriage of the unit of cellular orthogonal frequency division multiple access system; And
(b) according to these a plurality of interference measurement results decision frequency reuse modes of at least a portion, and the corresponding radio resources allocation of configuration.
24. the method for configuration radio resource according to claim 23 is characterized in that, the frame of each unit is divided into a plurality of radio resource region, and wherein, each travelling carriage is served by the corresponding radio resource area with corresponding frequencies multiplexer mode.
25. the method for configuration radio resource according to claim 23 is characterized in that, is decided by the comparative result of interference power that frequency reuse mode in (b) depends on that this travelling carriage receives and predetermined threshold value.
26. the method for configuration radio resource according to claim 23 is characterized in that, is decided by that the frequency reuse mode in (b) depends on the Signal to Interference plus Noise Ratio of this travelling carriage reception and the comparative result of the threshold value of being scheduled to.
27. the method for configuration radio resource according to claim 24; It is characterized in that; Should in (b), the step of decision frequency reuse mode comprise: determine the quantity and size of the radio resource region of each unit, and the frequency duplex factor as one of each radio resource region of decision.
28. the method for configuration radio resource according to claim 24 is characterized in that, should in (b), the step of decision frequency reuse mode comprise: definition and synchronization are used for the time-frequency region of each radio resource region of adjacent unit.
29. the method for configuration radio resource according to claim 24 is characterized in that, should in (b), the step of this radio resources allocation of configuration comprise: the through-put power that determines each radio resource region.
30. the method for configuration radio resource according to claim 24 is characterized in that, should in (b), the step of this radio resources allocation of configuration comprise: the antenna configurations that determines each radio resource region.
31. the method for configuration radio resource according to claim 24 is characterized in that, should in (b), the step of this radio resources allocation of configuration comprise: the channelizing form that determines each radio resource region.
32. the method for configuration radio resource according to claim 23; It is characterized in that, should in (b), this frequency reuse mode of decision carry out 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.
33. the method for configuration radio resource according to claim 23; It is characterized in that, should determine in (b) that the step of this frequency reuse mode and this radio resources allocation of configuration was to carry out through the coordination between neighbor base station in this cellular orthogonal frequency division multiple access system.
34. a cellular orthogonal frequency division multiple access system comprises:
A plurality of travelling carriages are measured a plurality of interference statistics amounts and are obtained a plurality of interference statistics amount results in view of the above; And
NE receives this a plurality of interference measurement results, and wherein, these a plurality of interference measurement results that this NE receives according at least a portion decide a plurality of frequency reuse modes and the corresponding radio resources allocation of configuration.
35. cellular orthogonal frequency division multiple access system according to claim 34 is characterized in that, this NE is the centralized radio resource unit of this cellular orthogonal frequency division multiple access system.
36. cellular orthogonal frequency division multiple access system according to claim 34; It is characterized in that; These a plurality of travelling carriages are served by serving BS, and wherein, this serving BS comprises this NE that receives these a plurality of interference measurement results and this frequency reuse mode of decision.
37. cellular orthogonal frequency division multiple access system according to claim 34; It is characterized in that; These a plurality of travelling carriages are served by a plurality of serving BS; Wherein, each serving BS receives these a plurality of interference measurement results and these a plurality of frequency reuse modes of decision through the coordination between a plurality of neighbor base stations.
38. the method for a data transmission scheduling comprises:
(a) obtain interference measurement results through the base station in the cellular orthogonal frequency division multiple access system; And
(b) according at least a portion of this interference measurement results that obtains, the scheduling travelling carriage is to be served by radio resource region.
39. the method according to the described data transmission scheduling of claim 38 is characterized in that, the data of this travelling carriage are sent in the unit that is divided into a plurality of radio resource region, and wherein each radio resource region is used the correspondent frequency multiplexer mode.
40. the method according to the described data transmission scheduling of claim 38 is characterized in that, the step that should in (a), obtain interference measurement results comprises: receive this interference measurement results from travelling carriage under these data.
41. the method according to the described data transmission scheduling of claim 38 is characterized in that, the step that should in (a), obtain interference measurement results comprises: through this base station measurement interference statistics amount, and obtain this interference measurement results in view of the above.
42. method according to the described data transmission scheduling of claim 38; It is characterized in that; Should in (b), the step of this travelling carriage of scheduling comprise: the data of dispatching this travelling carriage transmit via this radio resource region, so that the reception interference power of this travelling carriage is lower than predetermined threshold value.
43. method according to the described data transmission scheduling of claim 38; It is characterized in that; Should in (b), the step of this travelling carriage of scheduling comprise: the data of dispatching this travelling carriage transmit via this radio resource region, so that the Signal to Interference plus Noise Ratio of this travelling carriage is higher than predetermined threshold value.
44. the method according to the described data transmission scheduling of claim 38 is characterized in that, further comprises:
(c) indicate this travelling carriage on given time-frequency region, to measure the interference statistics amount, wherein, this serving BS is not uploaded feed signals in this given time-frequency region.
45. the method according to the described data transmission scheduling of claim 38 is characterized in that, further comprises:
(c) this interference measurement results of communicating by letter with the neighbor base station of this cellular orthogonal frequency division multiple access system.
46. a cellular orthogonal frequency division multiple access system comprises:
Travelling carriage; And
Serving BS obtains interference measurement results, and based at least a portion of this interference measurement results, the data of dispatching this travelling carriage are to be transmitted by radio resource region.
47. according to the described cellular orthogonal frequency division multiple access system of claim 46, it is characterized in that, this moving table measuring interference statistics amount, and obtain this interference measurement results in view of the above, wherein, this serving BS receives this interference measurement results from this travelling carriage.
48., it is characterized in that this serving BS is measured the interference statistics amount and obtained this interference measurement results in view of the above according to the described cellular orthogonal frequency division multiple access system of claim 46.
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| PCT/CN2008/072727 WO2009052754A1 (en) | 2007-10-16 | 2008-10-16 | Interference measurement mechanism for frequency reuse in cellular ofdma systems |
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| EP2204058A1 (en) | 2010-07-07 |
| TWI535306B (en) | 2016-05-21 |
| EP2204058A4 (en) | 2013-11-13 |
| JP2011502380A (en) | 2011-01-20 |
| CN102783165B (en) | 2016-02-24 |
| WO2009052754A1 (en) | 2009-04-30 |
| TW201424414A (en) | 2014-06-16 |
| TW200934262A (en) | 2009-08-01 |
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