WO2009052754A1 - Mécanisme de mesure d'interférences pour une réutilisation de la fréquence dans des systèmes ofdma cellulaires - Google Patents

Mécanisme de mesure d'interférences pour une réutilisation de la fréquence dans des systèmes ofdma cellulaires Download PDF

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Publication number
WO2009052754A1
WO2009052754A1 PCT/CN2008/072727 CN2008072727W WO2009052754A1 WO 2009052754 A1 WO2009052754 A1 WO 2009052754A1 CN 2008072727 W CN2008072727 W CN 2008072727W WO 2009052754 A1 WO2009052754 A1 WO 2009052754A1
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WIPO (PCT)
Prior art keywords
interference
radio resource
mobile station
interference measurement
serving base
Prior art date
Application number
PCT/CN2008/072727
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English (en)
Inventor
I Kang Fu
Original Assignee
Mediatek Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US12/287,990 external-priority patent/US8351949B2/en
Application filed by Mediatek Inc. filed Critical Mediatek Inc.
Priority to JP2010529222A priority Critical patent/JP2011502380A/ja
Priority to CN200880001723.6A priority patent/CN102783165B/zh
Priority to EP08841793.6A priority patent/EP2204058A4/fr
Publication of WO2009052754A1 publication Critical patent/WO2009052754A1/fr

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Classifications

    • 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 only
    • 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
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria

Definitions

  • the present invention relates generally to cellular OFDMA systems and, more particularly, to interference measurement mechanism for adaptive frequency reuse.
  • OF THE INVENTION In wireless mobile systems, frequency reuse is an important technique to improve the overall system capacity by reusing the scarce radio spectrum resource. Improvement of the system capacity, however, is achieved at the cost of link performance due to increased interference.
  • OFDMA orthogonal frequency division multiple access
  • Figure 1 is a diagram that illustrates a cell structure of a cellular OFDMA system 1.
  • Cellular OFDMA system 1 includes a cell structure having a frequency reuse factor 1/K equal to 1/4.
  • Frequency reuse factor 1/K represents the number of cells that cannot share the same frequency bands for transmission.
  • the entire licensed spectrum is partitioned into four frequency bands, and every four neighboring cells form a cluster of four cells, within which each cell is served by a different frequency band.
  • base station BS4 and base station BS5 share the same frequency band #1 to serve mobile station MS6 located within cell 2 and to serve mobile station MS7 located within cell 3 respectively.
  • BS4 transmits a desired data signal to communicate with MS6, it also transmits an undesired interference signal to MS7.
  • interference signal reduces the signal to interference-plus-noise ratio (SINR) of mobile station MS7 and thus reduces overall quality of service.
  • SINR signal to interference-plus-noise ratio
  • a smaller frequency reuse factor 1/K generally results a larger separation (e.g., SQRT (3K)* R, where R is the cell radius) from interfering sources, the available radio resource in each cell becomes lower (e.g., 1/K of the licensed spectrum).
  • FIG. 1 is a diagram that illustrates FFR in a cellular OFDMA system 10.
  • Cellular OFDMA system 10 includes a cell 11 that is partitioned into cell region 1 and cell region 2.
  • Cell region 1 is located in a geographic area closer to serving base station BS 12 while cell region 2 is located in a geographic area further to serving base station BS 12.
  • the radio spectrum of OFDMA system 10 is partitioned into a first frame zone and a second frame zone in time domain. Under adaptive frequency reuse technique, different frame zones are applied with different frequency reuse factors to serve mobile stations located in different cell regions.
  • mobile station MS 18 is located close to the boundary of cell 11, it is presumed to receive relatively weak data signals from BS 12 and relatively strong interference signals from neighboring interfering sources. Therefore, by serving MSl using a higher reuse factor (1/K) and serving MS2 using a lower reuse factor (1/K), a good tradeoff between system capacity and quality of service is achieved.
  • FFR technique based on geographic locations is not always effective.
  • a physical structure 14 is located between mobile station MS 18 and an interfering base station BS 13.
  • Interfering base station BS 13 thus transmits relatively strong interference signal 15 to MS 17 and relatively weak interference signal 16 to MS 18.
  • Interference measurement mechanisms have been addressed in various wireless mobile systems.
  • traditional cellular FDMA e.g. GSM
  • CDMA Code Division Multiple Access
  • narrow band signals are transmitted and received by transceivers. Due to the narrowband characteristic, an FDMA system can only measure the signal power or interference over one single time-frequency region at a given time. Such FDMA system is not able to freely measure among different time-frequency regions because the RF center frequency of the FDMA system needs to be adjusted accordingly.
  • OFDMA wideband signals are transmitted and received by transceivers equipped with Fast Fourier Transfer (FFT) functionality.
  • FFT Fast Fourier Transfer
  • the transceivers of the OFDMA system can freely measure the signal power or interference over a time-frequency region different from the time-frequency region for data receiving without changing the RF center frequency. This is a distinct feature of OFDMA systems as compared to other traditional cellular FDMA or CDMA systems.
  • 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.
  • adaptive frequency reuse is further coordinated with radio resource allocation, scheduling, power allocation, antenna configuration, and channelization format to more aggressively utilize system resource and jointly optimize system performance.
  • the mobile stations measure interference statistics and obtain interference measurement results.
  • a solicited, unsolicited or autonomous interference measurement mechanism may be used in measuring interference statistics.
  • the interference measurement results may then be obtained from the interference statistics directly or calculated from the interference statistics indirectly.
  • the interference measurement results may include an interference power, a signal to interference ratio (SIR), a signal to interference-plus-noise ratio (SINR), an index indicative of an interfering station, an index indicative of a preferred or non-preferred radio resource region, or other SIR/SINR derived form.
  • each mobile station measures its interference statistic over a designated time-frequency region while the serving base station does not transmit signal over the designated time-frequency region.
  • each mobile station measures its interference statistic over a designated time-frequency region while the serving base station transmit signal over the designated time- frequency region.
  • the serving base station transmits signal over the designated time-frequency region where the serving base station and interfering base stations are transmitting signal over that region, and the mobile station distinguishes the signal transmitted by serving base station from the signal transmitted by the interfering base stations.
  • the mobile stations then report the obtained interference measurement results to the serving base stations or a centralized network control element.
  • the serving base stations or the control element determines adaptive frequency reuse patterns based on the received interference measurement results.
  • adaptive frequency reuse in a cellular OFDMA system is achieved either by a centralized network control element or by inter-BS coordination among the base stations based on interference measurement results.
  • 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.
  • the base stations obtain the interference measurement results and communicate the interference measurement results among the neighboring base stations. The base stations then determine frequency reuse patterns and configure radio resource allocation based on the obtained interference measurement results through inter-BS coordination.
  • a base station obtains an interference measurement result and schedules a mobile station to be served with a radio resource region with an appropriate frequency reuse pattern.
  • the base station receives the interference measurement results from the mobile stations.
  • the base station measures its interference statistic and obtains the interference measurement result. The base station then schedules the mobile station to be served with an appropriate radio resource region to optimize system performance.
  • Figure 1 is a diagram illustrating a cell structure of a cellular OFDMA system.
  • Figure 2 is a diagram illustrating fractional frequency reuse in a cellular OFDMA system.
  • Figure 3 is a diagram that illustrates a cellular OFDMA system in accordance with a first novel aspect.
  • Figure 4 is a flow chart of measuring interference statistics and reporting interference measurement result in a cellular OFDMA system.
  • Figure 5 is a diagram that illustrates a solicited or unsolicited interference measurement mechanism.
  • Figure 6 is a diagram that illustrates an autonomous interference measurement mechanism.
  • Figure 7 is a diagram that illustrates examples of measuring interference statistics.
  • Figure 8 is a diagram that illustrates a first embodiment of a cellular OFDMA system in accordance with a second novel aspect.
  • Figure 9 is a diagram that illustrates a second embodiment of a cellular OFDMA system in accordance with the second novel aspect.
  • Figure 10 is a flow chart of determining frequency reuse pattern and configuring radio resource allocation based on interference measurement results.
  • Figure 11 is a diagram that illustrates one embodiment of determining antenna configuration based on interference measurement results.
  • Figure 12 is a diagram that illustrates one embodiment of determining channelization format based on interference measurement results.
  • Figure 13 is a diagram that illustrates a cellular OFDMA system in accordance with a third novel aspect.
  • Figure 14 is a flow chart of scheduling mobile stations based on interference measurement results.
  • Figure 15 is a diagram that illustrates an example of scheduling mobile stations based on interference measurement results.
  • Figure 16A and 16B illustrate examples of applying fractional frequency reuse together with uplink power control.
  • FIG. 3 is a diagram that illustrates a cellular OFDMA system 20 in accordance with a first novel aspect.
  • Cellular OFDMA system 20 includes a cell 21, a serving base station BS22, and a plurality of mobile stations including mobile stations MS23, MS24, and MS25 located in cell 21.
  • Each mobile station includes a transceiver 26, a measurement module 27, an analog baseband circuitry 28, a digital baseband circuitry 29, and memory 30.
  • Cellular OFDMA system 20 uses an adaptive frequency reuse (also referred as fractional frequency reuse (FFR)) technique to mitigate inter-cell interference.
  • FFR fractional frequency reuse
  • the total frequency channels available in OFDMA system 20 are partitioned into three different radio resource regions #1, #2 and #3.
  • the radio resource regions are partitioned either in time domain, or in frequency domain, or in a combination of both time domain and frequency domain.
  • Each radio frequency region is applied with a corresponding frequency reuse factor to serve mobile stations located in cell 21.
  • each mobile station located in cell 21 is served by an appropriate frequency reuse factor based on interference measurement results obtained by each mobile station.
  • each mobile station first measures its interference statistic and obtains an interference measurement result over a designated time-frequency region.
  • the interference statistic may be represented in a form of an interference power, a signal to interference ratio (SIR), a signal to interference-plus-noise ratio (SINR), or some other interference information.
  • the interference measurement result can either be obtained from the interference statistic directly or be calculated from the interference statistic indirectly.
  • the interference measurement result may be represented in a form of an interference power, a SIR, a SINR, an index indicative of an interfering station, an index indicative of a preferred or non-preferred radio resource region, or other SIR/SINR derived form.
  • Each mobile station then reports the interference measurement result to serving base station BS22.
  • serving base station BS22 schedules each mobile station to be served by a corresponding radio resource region with an appropriate radio resource region to optimize link performance while maximize system capacity.
  • Figure 4 is a flow chart of measuring interference statistics and reporting interference measurement results in a cellular OFDMA system.
  • a mobile station Under a solicited interference measurement mechanism, a mobile station first transmits an interference measurement request to a serving base station (step 31). After the solicitation, the mobile station then receives an interference measurement instruction from the serving base station (step 32). In step 34, the mobile station measures its interference statistic over a designated time-frequency region and thereby obtains an interference measurement result. The designated time-frequency region is provided by the interference measurement instruction. In the final step of step 35, the mobile station reports the interference measurement result to the serving base station. Under an unsolicited interference measurement mechanism, the mobile station does not transmit the interference measurement request. Instead, the serving base station instructs the mobile station to perform interference measurement directly.
  • the mobile station then follows the same steps of 34 and 35 to measure its interference statistic and report the interference measurement result to the serving base station.
  • an autonomous interference measurement mechanism there is neither interference measurement request nor interference measurement instruction communicated between the mobile station and the serving base station. Instead, the mobile station receives a resource allocation MAP broadcasted by the serving base station. By decoding the resource allocation MAP, the mobile station obtains the designated time- frequency region which can be used to perform interference measurement. The mobile station then follows the same steps of 34 and 35 to measure its interference statistic and report the interference measurement result to the serving base station.
  • FIG. 5 is a diagram that illustrates a solicited or an unsolicited interference measurement mechanism used in cell 40 of a cellular OFDMA system.
  • Mobile stations MS42, MS43, and MS44 are located in cell 40 that is served by a serving base station BS41.
  • a downlink (DL) frame of cell 40 is divided into N different frame zones (ZONE #1-#N) in time domain.
  • mobile stations MS42, MS43 and MS44 first solicit serving base station BS41 to instruct the mobile stations to measure their interference statistics.
  • serving base station BS41 After serving base station BS41 receives such solicitation, it instructs each mobile station to perform interference measurement over a designated time-frequency region within each frame zone.
  • serving base station BS41 initiates the interference measurement directly without receiving solicitation from the mobile stations.
  • the mobile stations are unable to distinguish whether the received signal is from the serving base station or from other interfering stations.
  • serving base station BS41 does not transmit data signal over the designated time-frequency region.
  • the total signal power received by each mobile station over the designated time-frequency region is equivalent to total received interference power and therefore is easily measurable.
  • the mobile stations are able to distinguish interference signals from data signals and thus are able to measure and calculate total received interference power, SIR, or SINR.
  • the pilot signal transmitted by each base station is encoded with a unique code. Therefore, the mobile stations can use the received pilot power from its serving base station to derive the received interference power from interfering base stations.
  • FIG. 6 is a diagram that illustrates an autonomous interference measurement mechanism used in cell 40 of a cellular OFDMA system.
  • Serving base station BS41 periodically broadcasts resource allocation MAP to all mobile stations located in cell 40.
  • mobile stations MS42, MS43, and MS44 decode the resource allocation MAP to obtain a decoded time-frequency region within each frame zone that serving base station BS22 does not transmit signal.
  • Each mobile station then allocates a designated time-frequency region within each frame zone to perform interference measurement autonomously.
  • the designated time-frequency region is a subset of the decoded time- frequency region over which serving base station BS41 does not transmit signal.
  • each mobile makes recommendation to serving base station BS41 on which time-frequency region should be designated to perform interference measurement.
  • the measurement module may be a piece of programmable or non-programmable hardware or software embedded within the mobile station for measuring the interference statistics.
  • FIG. 7 is a diagram that illustrates various examples of measuring an interference statistic of mobile station MS42 located in cell 40 of a cellular OFDMA system.
  • mobile station MS42 is served by serving base station BS41, and is within the reach of a nearby interfering station BS45.
  • serving base station BS41 transmits data signal 47 to MS42 while interfering station BS45 transmits an interference signal 46 to MS42.
  • mobile station MS42 obtains the interference power by measuring a reference signal power (e.g., a pilot signal power) of each base stations and the reference signal power is proportional to the total received signal power.
  • a reference signal power e.g., a pilot signal power
  • mobile station MS42 receives interference signal 46 and identifies a precoding matrix index (PMI) used by interfering station BS45.
  • PMI precoding matrix index
  • mobile station MS42 distinguishes data signal 47 from interference signal 46 and measures a signal to interference ratio (SIR) or a signal to interference-plus-noise ratio (SINR) received by MS42.
  • SIR signal to interference ratio
  • SINR signal to interference-plus-noise ratio
  • the mobile station After the mobile station measures a selected form of the interference statistics, it then obtains an interference measurement result accordingly.
  • the interference measurement result may be the same as the measured interference statistics.
  • the interference measurement result may also be calculated from the interference statistics indirectly.
  • the interference measurement result is represented by an index value that identifies an interfering base station. If a mobile station is able to identify the signal of a specific interfering base station from total received interfering signals, then it reports an index associated with at least one interfering station having the most significant interference. For example, the index is associated with the strongest SINR, the lowest interference power, or other interference information.
  • the specific interfering base station is selected among all of interfering base stations (excluding the serving base station) by the mobile station.
  • the specific interfering base station is selected by the mobile station.
  • the serving base station is capable of instructing the mobile station to report the specific interfering base station.
  • the interference measurement result is represented by an index value that identifies a preferred or non-preferred radio resource region calculated based on the measured interference statistics. Because the interference statistics of the mobile stations in different time-frequency regions may be much different, the mobile stations are able to gather different interference statistics by repeating the interference measurement over different time-frequency regions. After gathering interference statistics over different time-frequency regions, the mobile stations are able to select an index that identifies a preferred or non- preferred radio resource region. For example, the preferred radio resource region is identified by either the highest SINR or the lowest interference power, and the non-preferred radio resource region is identified by either the lowest SINR or the highest interference power.
  • the interference measurement results obtained from actual interference measurement by the mobile stations reflect dynamic network conditions and are more accurate than an interference power estimated from geographic locations or measured from preamble. Therefore, based on the accurate interference measurement results, the serving base stations or other network elements (such as a network operator, a network controller, or other similar elements) are able to apply adaptive frequency reuse more effectively to meet much higher system capacity requirement for next generation 4G mobile communication systems.
  • Adaptive frequency reuse is specifically suitable for cellular OFDMA systems because of its flexibility in allocating time-frequency resource to different cells.
  • mobile stations are scheduled to be served by different radio resource regions with appropriate frequency reuse patterns.
  • adaptive frequency reuse is further coordinated with radio resource allocation, scheduling, power allocation, antenna configuration, and channelization format to more aggressively utilize system resource and joint optimize system performance.
  • adaptive frequency reuse is achieved either by a centralized network control element or by inter-BS coordination among the base stations.
  • Figure 8 is a diagram that illustrates a first embodiment of a cellular
  • Cellular OFDMA system 50 in accordance with the second novel aspect.
  • Cellular OFDMA system 50 includes a centralized radio resource control element 51, a plurality of cells including cells 52-55, a plurality of serving base stations including BS56-59, and a plurality of mobile stations.
  • radio resource control element 51 first receives interference measurement results from base stations BS56-59 (or from the mobile stations directly). Radio resource control element 51 then determines frequency reuse patterns based on the received interference measurement results and other network configuration parameters.
  • Figure 9 is a diagram that illustrates a second embodiment of a cellular
  • serving base stations BS56-59 first receive interference measurement results from the mobile stations. Serving base stations BS56-59 then communicate with each other to determine frequency reuse patterns based on the received interference measurement and other network configuration parameters.
  • a downlink frame of cell 54 is partitioned into three radio resource regions with frequency reuse factors (1/K) equal to 1, 1/2, and 1/4 respectively to serve the three mobile stations located in cell 54.
  • Figure 10 is a flow chart of applying adaptive frequency reuse of a cellular OFDMA system in accordance with the second novel aspect. If cellular OFDMA system has a centralized radio resource control element, then the radio resource control element receives interference measurement results from the serving base stations (step 61). On the other hand, if no centralized control element is available, then the serving base stations receive interference measurement results from the mobile stations (step 62). In step 63, either the radio resource control element or the serving base stations determine frequency reuse patterns based on the received interference measurement results. More specifically, the following terms may be determined: the number of radio resource regions to be partitioned for each cell, frequency reuse factors to be applied with each radio resource region, and time-frequency regions to be used in each radio resource region.
  • either the radio resource control element or the serving base stations configure radio resource allocation based on the determined frequency reuse patterns. More specifically, the following terms may be determined: the transmit power of each radio resource region, the antenna configuration (e.g., beam pattern, precoding vector) of each radio resource region, and the channelization format (e.g., permutation rule over multiple cells) of each radio resource region.
  • the antenna configuration e.g., beam pattern, precoding vector
  • the channelization format e.g., permutation rule over multiple cells
  • mobile stations measure their interference statistics over different radio resource region associated with a corresponding frequency reuse factor.
  • each mobile station measures its received interference power or SINR over different radio resource regions and then reports the measured interference power or SINR to its serving base station.
  • the radio resource control element receives the measured interference power or SINR and then determines frequency reuse patterns based on the number of mobile stations located in each cell and based on the interference power or SINR of each mobile station over different radio resource regions.
  • frequency reuse patterns are determined such that either an average interference power is minimized or the interference power of each mobile station is compared with a predetermined threshold (e.g. the interference power of each mobile station is smaller than a predetermined threshold value).
  • FIG. 11 is a diagram that illustrates one embodiment of determining antenna configuration based on received interference measurement results in cellular OFDMA system 50.
  • base station BS56 originally serves mobile station MS68 by precoding matrix index (PMI) #k.
  • PMI precoding matrix index
  • mobile station MS 69 performs the measurement and reports an interference measurement result (for instance, the PMI index #k used by interfering station BS56) to its serving base station BS57.
  • Base station BS57 then communicates the interference measurement result to radio resource control element 51. Because mobile station MS69 is closely located to MS68, MS69 suffers strong interference due to PMI #K used by interfering station BS56. As a result, base station BS57 requests BS56 to change its beam pattern in order to mitigate such strong interference through radio resource control element 51.
  • Figure 12 is a diagram that illustrates one embodiment of determining channelization format based on received interference measurement results in cellular OFDMA system 50.
  • a localized channelization procedure the physical sub-carrier of each logical channel is distributed over a localized region in frequency domain.
  • the sub-carrier permutation for channelization in different cells remains the same.
  • interference from a specific interfering source could be very significant.
  • the physical sub-carrier of each logical channel is interleaved in frequency domain.
  • the sub-carrier permutation for the channelization in different cells is different in pseudo random manner. As a result, interference from any specific interfering source is randomized.
  • radio resource control element 51 is able to coordinate inter-cell interference using localized channelization method.
  • the serving base stations simply randomize all the signals transmitted over specific radio resource region to achieve the effect of interference randomization using interleaved channelization method.
  • Interference measurement result helps the cellular OFDMA system to apply different channelization methods or mixed channelization methods to mitigate inter-cell interference.
  • FIG. 13 is a diagram that illustrates a cellular OFDMA system 80 in accordance with a third novel aspect.
  • Cellular OFDMA system 80 includes a cell 81, a serving base station BS82 that serves cell 81, and mobile stations MS83 and MS84 that are located in cell 81.
  • serving base station BS82 either receives interference measurement results from mobile stations for downlink FFR control or measures interference statistics itself for uplink FFR control. Serving base stations BS82 then schedules the mobile stations to be served by appropriate radio frequency regions based on the interference measurement results.
  • Figure 14 is a flow chart of scheduling mobile stations to be served by appropriate radio resource region based on interference measurement results.
  • the serving base station instructs each mobile station to measure its interference statistic over a designated time-frequency region under different radio resource regions (step 91).
  • the serving mobile station receives the interference measurement result from each mobile station.
  • the serving mobile station schedules each mobile station to be served by an appropriate radio resource region under a corresponding frequency reuse factor such that network performance is optimized.
  • the serving base station measures its own interference statistic (step 93).
  • step 94 the serving base station communicates the interference measurement results to other base stations or to another centralized network control element.
  • adaptive frequency reuse patterns are determined by the serving base station alone or through inter-BS coordination based on the interference measurement results.
  • FIG. 15 is a diagram that illustrates an example of scheduling mobile stations based on interference measurement results in cellular OFDMA system 80.
  • Cellular OFDMA system 80 includes an interfering base station BS85 that serves a neighboring cell 81.
  • MS83 receives no interference signal from interfering station BS85 and MS84 receives a weak interference signal 88 that is blocked by physical structure 86. Therefore, based on the interference measurement results reported to serving base station BS82, BS82 schedules MS83 to be served in a radio resource region having frequency reuse factor 1/K equal to 1/3, and schedules MS84 to be served in a radio resource region having frequency reuse factor 1/K equal to 1.
  • radio resource is allocated to achieve a good balance between high system capacity and good quality of service.
  • Figure 16A is a diagram that illustrates an example of applying adaptive frequency reuse together with uplink power control through inter-BS coordination based on the interference measurement results. If the target interference over thermal (IoT) level of other cells for a radio resource region is low, then a mobile station assigned for that radio resource region is instructed to transmit with low power not to interfere other cell users. On the other hand, if the target IoT level of other cells for a radio resource region is high, then a mobile station assigned for that radio resource region is allowed to transmit with a higher power. To control system-wide interference, the serving base station adjusts the radio resource partitions and the corresponding target IoT level in coordination with other base stations.
  • IoT interference over thermal
  • Figure 16B is a diagram that illustrates an example for SINR based uplink power control where different target SINR level is designated for different radio resource regions.
  • the present invention has been described in connection with certain specific embodiments for instructional purposes, the present invention is not limited thereto.
  • the mobile stations in the present invention can be also referred to relay stations or similar variants. Accordingly, various modifications, adaptations, and combinations of various features of the described embodiments can be practiced without departing from the scope of the invention as set forth in the claims.

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Abstract

L'invention concerne une technique de réutilisation adaptative de la fréquence, selon laquelle des stations mobiles d'un système cellulaire d'accès multiple par répartition en fréquence orthogonale (OFDMA) sont desservies par différentes zones de ressources radio avec des modèles de réutilisation de la fréquence adaptés pour atténuer les interférences intercellulaires et augmenter la capacité du système. Dans un nouveau premier aspect, les stations mobiles mesurent les statistiques d'interférences et obtiennent des résultats de mesure d'interférences. Les stations mobiles communiquent les résultats de mesure d'interférences obtenus aux stations de base de service. Les stations de base de service déterminent des modèles de réutilisation adaptative de la fréquence en fonction des résultats de mesure d'interférences reçus. Dans un deuxième nouvel aspect, un élément de commande des ressources radio reçoit les résultats de mesure d'interférences, détermine des modèles de réutilisation de la fréquence et configure l'affectation des ressources radio en fonction des résultats de mesure d'interférences reçus. Dans un troisième nouvel aspect, les stations de base obtiennent les résultats de mesure des interférences et programment le service des stations mobiles avec des zones de ressources radio adaptées.
PCT/CN2008/072727 2007-10-16 2008-10-16 Mécanisme de mesure d'interférences pour une réutilisation de la fréquence dans des systèmes ofdma cellulaires WO2009052754A1 (fr)

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JP2010529222A JP2011502380A (ja) 2007-10-16 2008-10-16 干渉計測結果を提供する方法、干渉計測結果を提供する移動局、無線リソース割り当てを設定する方法、ｏｆｄｍａセルラシステム、及び移動局をスケジューリングする方法
CN200880001723.6A CN102783165B (zh) 2007-10-16 2008-10-16 蜂巢式正交频分多址接入系统中频率复用的干扰测量机制
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US12/287,990 2008-10-15
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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US10085154B2 (en) 2012-10-17 2018-09-25 Huawei Technologies Co., Ltd. System and method for dynamic inter-cell interference coordination
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CN102783165B (zh) 2016-02-24
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TWI535306B (zh) 2016-05-21
TWI433559B (zh) 2014-04-01
CN102783165A (zh) 2012-11-14
EP2204058A4 (fr) 2013-11-13
JP2011502380A (ja) 2011-01-20
TW201424414A (zh) 2014-06-16

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