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1 (19) TEPZZ_77874B_T (11) EP B1 (12) EUROPEAN PATENT SPECIFICATION (4) Date of publication and mention of the grant of the patent: Bulletin 13/31 (1) Int Cl.: H04L /02 (06.01) H04L 27/26 (06.01) (21) Application number: (22) Date of filing: (4) Apparatus and method for assigning sub-channels in an OFDMA system Einrichtung und Verfahren zur Zuweisung von Unterkanälen in einem OFDMA-System Dispositif et procédé d allocation de sous-canaux dans un système AMDFO (84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR () Priority: KR (43) Date of publication of application: Bulletin 07/16 (73) Proprietor: Ericsson-LG Co., Ltd. Seoul (KR) (72) Inventors: Kim, Dong Hun Bundang-gu Seongnam-si Gyeonggi-do (KR) Lee, Jung Yun Anyang-si Gyeonggi-do (KR) Kim, Young Keun Seongnam-si Gyeonggi-do (KR) (74) Representative: Katérle, Axel Wuesthoff & Wuesthoff Patent- und Rechtsanwälte Schweigerstraße München (DE) (6) References cited: EP-A EP B1 Note: Within nine months of the publication of the mention of the grant of the European patent in the European Patent Bulletin, any person may give notice to the European Patent Office of opposition to that patent, in accordance with the Implementing Regulations. Notice of opposition shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). Printed by Jouve, 7001 PARIS (FR)

2 Description BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an OFDMA (Orthogonal Frequency Division Multiplexing Access) system, and more particularly to an apparatus and method for minimizing interference caused by sub-channel frequency overlaps when assigning sub-channels for sectors of a base station in an OFDMA system of a FDMA (Frequency Division Multiple Access) type. 2. Background of the Related Art [0002] Recent advances in mobile communication technologies have led to a move from using analog methods to digital methods in signal processing. Also, in addition to voice and text communication services, multimedia communication services are now also provided for commercial use. In line with such progress, there has been a growing interest in the 4 th generation communication system, which establishes a more effective communication environment based on systematic inter-operations between a mobile communication system and a radio access and wide-band wired system. [0003] Also, an OFDM transmission method is being proposed as a radio transmission method in order to enable various services to be provided in the 4 th generation communication system. The basic principle of the OFDM transmission method is to transform data rows inputted in series into a plurality of parallel data rows so as to separately carry each of the parallel data on a separate sub-carrier. In such a case, the frequency of the sub-carriers must be selected to maintain orthogonality between the sub-carriers, wherein such orthogonality allows each of the sub-carriers to overlap in the spectrum region. [0004] Also, as for the 4 th generation communication system based on the prior OFDM transmission method, an OFDMA technology based on the OFDM system has been proposed as a multiple user access method in order to satisfy various QoS (Quality of Service) requirements, i.e., to maintain service quality while supporting various types of services and applications. The OFDMA method has the advantage of providing frequency and time in accordance with the user s requests by dividing the frequency band and time. [000] Further, since the same medium (channel) is shared by a plurality of users, the interference from neighboring cells or sectors greatly affects the communication quality. Thus, in order to reduce the interference, a FDMA based system uses a frequency reuse factor of 1/7 as a default value, while a CDMA based system employs power control methods, for example. In contrast, the OFDMA system aims to use 1 as its frequency reuse factor. However, this inevitably leads to the interference phenomenon caused by the sub-carrier frequency overlap when there is an increase in the number of users in the multiple-sector environment. [0006] That is, in the multiple sector (or cell) environment exemplified in Fig. 1, the sub-carriers will inevitably be assigned to multiple sectors or cells when a sum of cell loads of each sector constituting the base station is greater than 1. This requires a resource assignment method, which is different from the prior methods, in order to reduce the interference effect of these multiply assigned sub-carriers. [0007] Also, prior OFDMA systems assign resources by unit of sub-channels consisting of a combination of subcarriers and can be classified as PUSC (Partially Used Sub Carrier), FUSC (Fully Used Sub Carrier) or Band AMC (Band Adaptive Modulation Coding) types, etc. according to their sub-channel combination type. The PUSC and FUSC types are designed to avoid the same sub-carriers from being in proximity with each other when preparing the sub-channels to obtain frequency diversity. The Band AMC type is designed to allow the sub-carriers to be in proximity with each other when preparing the sub-channels to maximize the utilization of a change in the channel. However, conventionally, the assignment of the combined sub-channels is not managed by a single base station or controller, but rather independently by each sector, such that the problem of the interference caused by frequency overlap (i.e., sub-carrier overlap) arises. [0008] Fig. 2 is a diagram illustrating a case of sub-channels randomly assigned in a conventional OFDMA system. The first sub-channel assignment method illustrated in Fig. 2 is a conventional random assignment method. When the total sum of the cell loads of each sector is greater than 1 (1/2+1/2+1/2=1.), not only are there sub-channels of class 0 which are not assigned to any of the sectors (channel indexes 43-48), but there are also a lot of sub-channels that are inefficiently assigned. This increases the number of sub-channels of class 2 (a group of sub-channels assigned to 2 sectors, channel indexes 7-18, 2-) and the number of sub-channels of class 3 (a group of sub-channels assigned to all sectors, channels indexes 1-6). Thus, the interference phenomenon caused by the frequency overlap cannot be efficiently managed. Another sub-channel assignment method is e.g. disclosed in EP

3 SUMMARY OF THE INVENTION 1 2 [0009] Embodiments according to the present invention provide an OFDMA system with a base station or controller adapted to collect and analyze information on used channels and load of each sector to assign sub-channels to each sector. [00] Embodiments according to the present invention also provide an OFDMA system that performs sub-channel assignment at a base station or controller such that no sub-channel is multiply assigned to the neighboring sectors when the cell load of the system is low, and such that interference effects caused by the frequency overlap of the sub-carriers are minimized when the cell load is above a critical point where the assignment of the sub-carriers of the same frequency to the multiple sectors or cells is needed. [0011] Embodiments according to the present invention further provide an OFDMA system with a base station or controller that provides faster channel assignment scheduling and maximum utilization efficiency of the radio resource by using a quantitative value on the ratios for assigning the sub-channels for each sector, wherein the ratios are based on the channel and load information of each sector. [0012] According to one embodiment according to the present invention, an apparatus for assigning sub-channels in an OFDMA system with a plurality of sectors is provided. The apparatus may comprise: a plurality of sector channel management parts each for assigning channels having assignable channel indexes in response to requests from users in a sector managed by the sector channel management part, and reporting sector load information regarding the total number of the requests from the users in the sector; and a channel assignment scheduler for using the sector load information reported from each of the channel management part to calculate the number of assignable channels per class for each of the sectors, determining the assignable channel indexes per class for each of the sectors according to the numbers of assignable channels, and forwarding the assignable channel indexes to each of the sector channel management parts, wherein said class is a group consisting of channels to be assigned to a same number of sectors. [0013] According to another embodiment according to the present invention, a method for assigning sub-channels in an OFDMA system is provided. The method may comprise: receiving reports from each of a sector channel management part on sector load information regarding the number of channel assignment requests from users in sectors managed by each of the sector channel management parts; calculating the number of assignable channels per class for each of the sectors by using the sector load information of each of the sectors; determining assignable channel indexes per class for each of the sectors according to the number of assignable channels per class for each of the sectors; and forwarding each of the channel indexes to corresponding sector channel management parts, wherein the class is a group consisting of channels assigned to the same number of sectors. BRIEF DESCRIPTION OF THE DRAWINGS 3 [0014] The present invention is further described in the detailed description which follows in reference to the noted plurality of drawings by way of non-limiting examples of embodiments of the present invention in which like reference numerals represent similar parts throughout the several views of the drawings and wherein: 4 0 Fig. 1 is a diagram illustrating a multiple sector environment of a conventional base station. Fig. 2 is a diagram illustrating a case of sub-channels randomly assigned in a conventional OFDMA system. Fig. 3 is a diagram illustrating a sub-channel assigning apparatus in an OFDMA system according to an exemplary embodiment of the present invention. Fig. 4 is a diagram illustrating a case where sub-channels are assigned to set the number of sub-channels of Class 0 to 0 and the number of sub-channels of Class 3 to maximum according to an exemplary embodiment of the present invention. Fig. is a diagram illustrating a case where sub-channels are assigned to set the number of sub-channels of Class 0 to 0 and the number of sub-channels of Class 3 to minimum according to an exemplary embodiment of the present invention. Figs. 6 and 7 are diagrams exemplifying the sub-channel assignment method of Fig. when the sum of the cell loads of each sector is greater than 1 but smaller than or equal to 2. Figs. 8 and 9 are diagrams exemplifying the sub-channel assignment method of Fig. when the sum of the cell loads of each sector is greater than 2 but smaller than or equal to 3. Fig. is a flow chart illustrating a sub-channel assignment method of an OFDMA system according to one exemplary embodiment of the present invention. Fig. 11 is a flow chart illustrating a method of calculating the number of assigned channels of an OFDMA system according to an exemplary embodiment of the present invention. 3

4 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [001] Henceforth, the preferred embodiments of the present invention will be described in detail in connection with the attached drawings. [0016] Fig. 3 is a diagram illustrating a sub-channel assigning apparatus in an OFDMA system according to an exemplary embodiment of the present invention. In the exemplary embodiment of the present invention, sector (or cell) load information and channel quality information are completely managed in a base station or controller to thereby realize a sub-channel assignment function that minimizes the interference phenomenon caused by the frequency overlap. Such sub-channel assignment function can be realized based on an example OFDMA system as illustrated in Fig. 3. [0017] Referring more particularly to Fig. 3, a sub-channel assignment apparatus 0 according to an exemplary embodiment of the present invention may comprise: a plurality of sector channel management part 1a, 1b, 1c for performing sub-channel assignment and management functions for each sector and for creating and reporting the sector load information and the channel quality information of the corresponding sector on every frame; and a channel assignment scheduler 1 for collecting and analyzing the sector load information and the channel quality information reported on every frame from each of the sector channel management parts 1a, 1b, 1c, thereby calculating the number of assignable channels per class for each of the sectors and the number of assignable channels per the sectors to be assigned for the respective classes. Such information can then be forwarded on the assignable channel indexes per class for each of the sectors and/or information on the assignable channel indexes per sector for each of the classes to each of the sector channel management parts, thus controlling the sub-channel assignment. [0018] Herein, the class refers to groups of sub-channels classified from a pool of total sub-channels that can be assigned to the sectors by the number of sectors the sub-channel is assigned in the base station or controller. For example, assuming that three sectors (sector A, sector B, sector C) are managed by the base station, the sub-channels can be classified into class 0 (including a group of sub-channels not assigned to any of the three sectors), class 1 (including a group of sub-channels assigned to only one of the three sectors), class 2 (including a group of sub-channels assigned to two of the three sectors), and class 3 (including a group of sub-channels assigned to all three sectors). [0019] Each sector channel management part 1a, 1b, 1c reports the sector load information, which is proportional to the number of channel assignment requests by the users located, among a plurality of sectors managed by the base station in the sector managed by the respective sector management part (preferably, the channel quality information containing signal to noise ratio information for channels currently in use to channel assignment scheduler 1 on every frame). Each sector channel management part 1a, 1b, 1c performs sub-channel assignment in response to requests from each user located in the sector managed by the respective sector channel management part according to the information on the assignable channel indexes per class for each of the sectors transmitted on every frame from channel assignment scheduler 1. Preferably, when assigning the sub-channel, each sector channel management part 1a, 1b, 1c sequentially assigns the sub-channels starting from the sub-channels of a class with sub-channels assigned to a less number of sectors. For example, when assigning the sub-channels, each sector channel management part 1a, 1b, 1c first assigns the sub-channels of a class with sub-channels not assigned to multiple sectors according to the information on the assignable channel indexes per class, followed by the sub-channels of a class with sub-channels assigned to multiple sectors according to the information on the assignable channel indexes classified by the sectors to be assigned for the respective classes. In addition to the channel index information, each sector channel management part 1a, 1b, 1c can receive information on the number of assignable channels per each class and the number of assignable channels per sectors to be assigned for the respective classes on every frame. [00] The channel assignment scheduler 1 located in the base station or controller controls each sector channel management part 1a, 1b, 1c to thereby control the sub-channel assignment for each of the sectors managed by the base station on every frame. The channel assignment scheduler collects and analyzes the sector load information reported from each sector channel management part 1a, 1b, 1c on every frame and calculates the number of assignable channels per class for each of the sectors and the number of assignable channels per sectors to be assigned for the respective classes. Also, the channel assignment scheduler 1 determines the assignable channel indexes per class for each of the sectors and per sectors to be assigned for the respective classes according to the calculation result on the number of assignable channels and the channel quality information reported with the sector load information from each of the sector channel management parts. The channel assignment scheduler 1 forwards the assignable channel indexes information per class for each of the sectors and/or per sectors to be assigned for the respective classes determined as such, thereby controlling the sub-channel assignment of each sector channel management part 1a, 1b, 1c. [0021] In the base station consisting of aforementioned multiple sectors, if the sum of the cell loads of each sector is greater than 1, then a sub-channel that is multiply assigned (i.e., sub-channel assigned to multiple sectors) inevitably arises. Thus, in order to minimize the interference phenomenon caused by the frequency overlap of the sub-channels assigned to the multiple sectors, the number of assignable channels (i.e., number of sub-channels) per class and/or per sector to be assigned for each of the classes is calculated. In such a case, the number of sub-channels of class 0 should 4

5 be 0 to maximize the sub-channel assignment efficiency. Also, the number of sub-channels multiply assigned to other sectors, such as the sub-channels of class 2 or 3, should be minimized in order to reduce the sub-channel interference. [0022] The detailed description on the sub-channel assignment method in the OFDMA system of such construction, especially those with 3 sectors (e.g., sector A, sector B and sector C) under the base station, is provided below. [0023] Fig. 4 is a diagram illustrating a case where the sub-channels are assigned to set the number of sub-channels of class 0 to 0 and the number of sub-channels of class 3 to maximum, according to an exemplary embodiment of the present invention. Fig. is a diagram illustrating a case where the sub-channels are assigned to set the number of subchannels of class 0 to 0 and the number of sub-channels of class 3 to minimum according to an exemplary embodiment of the present invention. [0024] In the exemplary method illustrated in Fig. 4, the number of sub-channels of class 3 (a group of sub-channels assigned to all the sectors) are inefficiently large. Thus, a portion of users assigned to the sub-channels of class 3 experiences heavy interferences due to the frequency overlap with the users of other sectors. On the other hand, the other users are assigned to the sub-channels of class 1, thus enabling communication to be free from the interference caused by the frequency overlap. [002] Another exemplary sub-channel assignment method illustrated in Fig. performs the sub-channel assignment with regards to the cell load of each sector. The operation of each sector channel management part and the channel assignment scheduler is explained in detail as follows. [0026] For example, as to the cell construction shown in Fig. 1, the cell loads of sectors A, B and C, which are managed by the base station, are defined as Wa, Wb and Wc, respectively. In this instance, the channel assignment scheduler 1 collects and analyzes the load information reported from each of the sectors. When the sum of the cell loads is smaller than or equal to 1 (Wa+Wb+Wc<=1), this implies that the total number of channels requested by all the users in the sectors are smaller than or equal to the total number of assignable channels. Thus, when assigning the subchannels, the sub-channels can be assigned without any sub-channels being multiply assigned. That is, the number of sub-channels of classes 2 and 3 (a group of sub-channels multiply assigned to sectors 2 and 3, respectively) can be made to 0. Also, the number of sub-channels of class 0 (a group of sub-channels assigned to only one sector) can be made to correspond to the cell loads of each sector. By doing so, the assignable channel indexes per each sector and per each class can be determined. For example, assuming that the cell load of sector A (Wa) is /48, the cell load of sector B (Wb) is 1/48 and the cell load of sector C (Wc) is /48, since the total cell load of all sectors (Wa+Wb+Wc) is smaller than 1 (the total cell load is 4/48), the number of sub-channels of classes 2 and 3 will be made to 0 while the number of sub-channels of class 1 is calculated to be the value matching the total cell load for all the sectors (that is, 4). Among the sub-channels of class 1, channel indexes are assigned to sector A, 1 channel indexes are assigned to sector B, and channel indexes are assigned to sector C. Then, the information per sector and per class are forwarded to the corresponding sector channel management parts 1a, 1b, 1c, to thereby control the sub-channel assignment, such that each sector channel management part does not multiply assign the sub-channels. [0027] Figs. 6 and 7 are diagrams exemplifying the sub-channel assignment method of Fig. when the sum of the cell loads of each sector is greater than 1 but smaller than or equal to 2. When the channel assignment scheduler 1 collects and analyzes the load information reported from each sector channel management part to find that the total sum of the cell loads of each of the sectors is greater than 1 but smaller than or equal to 2 (that is 1<Wa+Wb+Wc 2), this implies that the total number of channels requested by all the sectors is greater than the number of total assignable channels and thus the sub-channel assignment should be performed in consideration of the interference due to the frequency overlap. [0028] With this in mind, as exemplified in Fig. 6, the number of sub-channels of class 1 assigned only to one of sectors A, B and C is respectively defined as Sa, Sb and Sc. In order to maintain the ratio of the number of sub-channels of class 1 for each sector (that is, the ratio of Sa, Sb and Sc) equal to the ratio of the number of sub-channels of class 2 (the group of sub-channels multiply assigned to 2 sectors), the ratio of Sa, Sb and Sc is made to follow the ratio of the cell loads of each sector Wa, Wb and Wc. [0029] By doing so, the total number of sub-channels of class 1 becomes Sa+Sb+Sc, and the total number of subchannels of class 2 becomes [00] In such a case, to make the number of sub-channels of class 0 (the group of sub-channels not assigned to any of the sectors) to 0, the condition must be satisfied. Since the ratio of the number of sub-channels of class 1 is equal to the ratio of the cell loads of each sector (that is, Sa : Sb : Sc = Wa : Wb : Wc ), the number of sub-channels of each sector becomes

6 , [0031] Also, since the total number of sub-channels of class 1 is S=2-(Wa+Wb+Wc), the number of class 1 subchannels of each sector calculated above, Sa, Sb, Sc, can be represented as equation 1 shown below [0032] The number of class 2 sub-channels of sector A multiply assigned to sector B is defined as Sab. The number of sub-channels multiply assigned to other sectors can be similarly defined. In summary, they are defined as Sab, Sac, Sba, Sbc, Sca, Scb, wherein Sab=Sba, Sac=Sca, Sbc=Scb. [0033] To illustrate the sub-channel assignment procedure based on the above definitions, all sub-channels for sector A are first assigned, starting from an initial sub-channel assignment point for the total sub-channels wherein, for the cell load of sector A (Wa), the sub-channel multiply assigned to sector (Sac) is assigned first, the sub-channels only assigned to sector A (Sa) are then assigned, and the sub-channels multiply assigned to sector B (Sab) are assigned last. [0034] After all the sub-channels for sector A have been assigned, the sub-channels for sector B are assigned. The sub-channels for sector B are assigned next to the position of the sub-channels multiply assigned to sector C (Sac) and the sub-channels only assigned to sector A (Sa) among the cell load of sector A (Wa). The sub-channels multiply assigned to sector A (Sba) are assigned first, the sub-channels assigned only to sector B are then assigned, and then the subchannels multiply assigned to sector C (Sbc) are assigned last. [003] After all the sub-channels of sector B are assigned, the sub-channels of sector C are sequentially assigned. As explained above, the sub-channels for sector C are assigned to the position next to the sub-channels multiply assigned to sector A (Sba) and the sub-channels only assigned to sector B (Sb) among the cell load of sector B (Wb). The subchannels multiply assigned to sector B (Scb) are first assigned, then the sub-channels only assigned to sector C (Sc) are assigned, and lastly, starting from the initial sub-channel assignment point, the sub-channels multiply assigned to sector C (Sca) are assigned. [0036] According to the aforementioned sub-channel assignment results, three equations, i.e., (1) Sac+Sa+Sab=Wa, (2) Wa+(Wb-Sab)+Sc=1 and (3) Wa+Sb+Sbc+Sc=1, can be obtained. Using the above equations, the number of subchannels multiply assigned to other sectors can be derived for each sector as shown in equation 2 shown below. In equation 2, Sab and Sba are each the number of sub-channels multiply assigned to sectors A and B, Sbc and Scb are each the number of sub-channels multiply assigned to sectors B and C, Sca and Sac are each the number of subchannels multiply assigned to sectors C and A. 0 6

7 [0037] When the sum of the cell loads of each of the sectors is greater than 1 but smaller than or equal to 2 (1<Wa+Wb+Wc 2), the channel assignment scheduler 1 calculates the number of assignable channels per class for each of the sectors and the number of assignable channels per sectors to be assigned for the respective classes for every frame in a direction of minimizing the interference caused by the frequency overlap. Then, the channel assignment scheduler 1 determines the assignable channel indexes per class for each of the sectors and per sectors to be assigned for the respective classes according to the calculation results on the number of assignable channels. [0038] For example, as illustrated in Fig. 7, when the cell load of sectors A, B and C are respectively /8, 4/8 and 3/8, the number of class 1 sub-channels for each sector (Sa, Sb Sc) can be calculated by using the aforementioned equation 1. Further, the number of sub-channels multiply assigned to other sectors for each of the sectors (Sab, Sac, Sba, Sbc, Sca and Scb) can be calculated by using the aforementioned equation 2. [0039] The assignable channel indexes per class for each of the sectors and per sectors to be assigned for the respective classes are determined by the channel assignment scheduler 1, according to the calculated result for the number of assignable channels as shown below: For sector A, channel indexes 1-, 13- are determined as assignable for the sub-channels of class 2 (Sab, Sac) and channel indexes 6-12 are determined as assignable for the sub-channels of class 1 (Sa), wherein such information on the assignable channel indexes are forwarded to the sector channel management part of sector A, 1a. For sector B, channel indexes 13-, are determined as assignable for the sub-channels of class 2 (Sba, Sbc) and channel indexes 21-2 are determined as assignable for the sub-channels of class 1 (Sb), wherein such information on the assignable channel indexes are forwarded to the sector channel management part of sector B, 1b. For sector C, channel indexes 1-, are determined as assignable for the sub-channels of class 2 (Sca, Scb) and channel indexes are determined as assignable for the sub-channels of class 1 (Sc), wherein such information on the assignable channel indexes are forwarded to the sector channel management part of sector C, 1c. [00] Figs. 8 and 9 are diagrams exemplifying the sub-channel assignment method of Fig. when the sum of the cell loads of each sector is greater than 2 but smaller than or equal to 3. When the channel assignment scheduler 1 collects and analyzes the load information reported from each sector channel management part 1a, 1b, 1c, to find that the sum of the cell loads of each sector is greater than 2 but smaller than or equal to 3 (that is, 2<Wa+Wb+Wc 3), this implies that there must inevitably be the sub-channels of class 3 (group of sub-channels multiply assigned to 3 sectors). Thus, it is preferable to maximize the number of sub-channels of class 2 (sub-channels multiply assigned to 2 sectors) when assigning the sub-channels. To achieve this, preferably, the number of sub-channels of class 3 must be minimized. Also, the number of sub-channels of class 0 (sub-channels not assigned to any of the sectors) and class 1 (sub-channels assigned to only one of the sectors) must be 0. [0041] In this case, as illustrated in Fig. 8, assuming that the number of sub-channels of class 3 for each sector is Ta, Tb and Tc, the total number of the sub-channels of class 2 must be 1 at maximum. [0042] Therefore, the condition is met. When examining the cell load of 0 each sector, the cell load of sector A becomes Wa=Sab+Sac+Ta+Tb+Tc, the cell load of sector B becomes Wb=Sba+Sbc+Ta+Tb+Tc, and the cell load of sector C becomes Wc=Sca+Scb+Ta+Tb+Tc. Herein, Sab, Sac, Sba, Sbc, Sca, Scb correspond to the number of sub-channels multiply assigned to 2 sectors, which are different from each other, wherein Sab=Sba, Sac=Sca and Sbc=Scb. [0043] Using the above equation for the cell loads of each sector to calculate the number of sub-channels of class 3, 7

8 the equations and can be obtained. In such a case, since the total number of sub-channels of class 3 is T=Wa+Wb+Wc-2, the number of class 3 sub-channels of each sector Ta, Tb, Tc can be represented by equation 3 shown below. 1 2 [0044] Further, as in the case where the sum of the cell loads of each sector is greater than 1 but smaller than or equal to 2, the number of sub-channels multiply assigned to other sectors in each sector can be found using equation 4 shown below. In equation 4 shown below, Sab and Sba are each the number of sub-channels multiply assigned to sectors A and B, Sbc and Scb are each the number of sub-channels multiply assigned to sectors B and C, and Sca and Sac are each the number of sub-channels multiply assigned to sectors C and A [004] When the sum of the cell loads of each sector is greater than 2 but smaller than or equal to 3 (that is, 2<Wa+Wb+Wc 3), the channel assignment scheduler 1 calculates the number of assignable channels per class for each sector and the number of assignable channels per sectors to be assigned for the respective classes for every frame in a direction of minimizing the interference caused by the frequency overlap. Then, the channel assignment scheduler 1 determines the assignable channel indexes per class for each sector and per sectors to be assigned for the respective classes, according to the calculation results for the number of assignable channels. [0046] For example, as illustrated in Fig. 9, when the cell load of sectors A, B and C are respectively 4/60, 0/60 and /60, the number of class 3 sub-channels for each sector (Ta, Tb, Tc) can be calculated by using the above equation 3. Further, the number of sub-channels multiply assigned to other sectors for each sectors Sab, Sac, Sba, Sbc, Sca, and Scb can be calculated by using the above equation 4. [0047] The assignable channel indexes per class for each sector and per sectors to be assigned for the respective classes are determined by the channel assignment scheduler 1, according to the calculated results on the number of assignable channels as shown below: For sector A, channel indexes 1-9, 2-34 and 4- are determined as assignable, 8

9 respectively, for the sub-channels of class 3, Ta, Tb, and Tc, while channel indexes -24, 3-44 are determined as assignable for the sub-channels of class 2 (Sab, Sac), wherein such information on the assignable channel indexes are forwarded to the sector channel management part 1a of sector A. For sector B, channel indexes 1-9, 2-34 and 4- are determined as assignable, respectively, for the sub-channels of class 3, Ta, Tb and Tc, while channel indexes -24, 6-60 are determined as assignable for the sub-channels of class 2 (Sba, Sbc), wherein such information on the assignable channel indexes are forwarded to the sector channel management part 1b of sector B. For sector C, channel indexes 1-9, 2-34 and 4- are determined as respectively assignable for the sub-channels of class 3, Ta, Tb, and Tc, while channel indexes 3-44, 6-60 are determined as assignable for the subchannels of class 2 (Sca, Scb), wherein such information on the assignable channel indexes are forwarded to the sector channel management part 1c of sector C. [0048] Also, in determining the assignable channel indexes per class for each sector and per sectors to be assigned for the respective classes, according to the calculated result for the number of assignable channels based on the aforementioned conditions, the channel assignment scheduler 1 determines the assignable channel indexes per class for each sector and per sectors to be assigned for the respective classes according to the channel information reported with the cell load information from each sector channel management part 1a, 1b, 1c (in addition to the above calculated information on the number of assignable channels). [0049] That is, even though the channel assignment scheduler uses the above calculated information on the number of assignable channels to determine the assignable channel indexes per class for each sector and per sectors to be assigned for the respective classes, when the analyzed result of the channel information reported from each sector channel management part indicates that an arbitrary sub-channel in a certain sector has a low signal to noise ratio, the channel indexes are determined not to assign the said sub-channel once again to the said sector (that is, the sector having the low signal to noise ratio). On the other hand, when the analyzed result of the channel information reported from each sector channel management part indicates that an arbitrary sub-channel in a certain sector has a high signal to noise ratio, the channel indexes are determined to once again assign the said sub-channel to the said sector (that is, the sector having the high signal to noise ratio). [000] As such, after determining the assignable channel indexes per class for each sector and per sectors to be assigned for the respective classes for every frame, the channel assignment scheduler 1 forwards the channel index information to the corresponding sector channel management part 1a, 1b, 1c performing the sub-channel assignment and management function for the corresponding sector. Each sector channel management part 1a, 1b, 1c performs the sub-channel assignment requested by each user located in the sector, according to the assignable channel index information per each class and per sectors to be assigned for the respective classes forwarded from the channel assignment scheduler 1 for every frame. [001] In this case, it is preferable for each sector channel management part 1a, 1b, 1c to first assign the subchannels corresponding to the assignable sub-channels of class 1 (group of sub-channels not multiply assigned to other sectors) among the assignable channels indexes for all classes and then assign the sub-channels corresponding to the assignable channel indexes of classes 2 and 3 (group of sub-channels multiply assigned to other sectors). This is to minimize the interference caused by the frequency overlap. [002] Fig. is a flow chart illustrating a sub-channel assignment method of an OFDMA system according to one exemplary embodiment of the present invention. Referring to Fig., the channel assignment scheduler 1 of subchannel assignment apparatus 0 of an OFDMA system according to an exemplary embodiment of the present invention receives reports from each sector management part 1a, 1b, 1c on sector load information regarding the number of channel assignment requests of users in the sector managed by each sector channel management part 1a, 1b, 1c and channel quality information including the signal to noise ratio of the channels currently in use (S0). Preferably, the numbers of assigned channels per class of each sector are classified by the sectors to be assigned for each of the classes. The number of assignable channels per class for each sector is calculated using the sector load information (S 1). [003] The channel assignment scheduler 1 determines the assignable channel indexes per classes for each sector according to the calculated number of assignable channels per class for each sector and the channel quality information (S1). Then, the channel assignment scheduler 1 forwards the assignable channel indexes to each corresponding sector channel management part 1a, 1b, 1c (S1). Preferably, the assignable channel indexes are sequentially determined, first for the classes with sub-channels assigned to more sectors, according to the calculated number of subchannels for each class. Further preferably, when the magnitude of the signal to noise ratio according to the channel quality information of the channel is larger than a predetermined threshold, the channel index of the channel is determined as the assignable channel index. Each sector channel management part 1a, 1b, 1c receives the calculated channel index for the corresponding channel and in response to a request from a user in the sector managed by itself, assigns one of the channels having the forwarded assignable channel index (S1). Preferably, the sub-channels are assigned sequentially with the sub-channels of a class with sub-channels assigned to a less number of sectors assigned first. 9

10 1 2 3 [004] Fig. 11 is a flow chart illustrating a method of calculating the number of assigned channels of an OFDMA system according to an exemplary embodiment of the present invention. Referring to Fig. 11, the channel assignment scheduler 1 of channel assignment apparatus 0 of an OFDMA system according to an exemplary embodiment of the present invention determines whether the sum of cell loads of each sector is smaller than or equal to 1 (S0). [00] If the sum of cell loads of each cell is determined to be smaller than or equal to 1, then the channel assignment scheduler 1 sets the number of sub-channels of classes 2 and 3 to 0 (S2). Since the total number of channels requested by the sectors is smaller than the number of total assignable channels, there is no need to assign the subchannels of class 2 or 3. Then, the channel assignment scheduler 1 calculates the number of sub-channels of class 1 for each sector to correspond to the cell load of each sector (S2) and ends the procedure. [006] If the sum of the cell loads of each cell is determined not to be smaller than or equal to 1, then the channel assignment scheduler 1 determines whether the sum of the cell loads of each cell is larger than 1 but smaller than or equal to 2 (S2). If the sum of cell loads of each cell is determined to be larger than 1 but smaller than or equal to 2, then the channel assignment scheduler 1 sets the number of sub-channels of class 0 and 3 to 0 (S2). In this instance, the sum of the numbers of channels requested by each sector must be larger than the number of total assignable sub-channels, and there inevitably is a sub-channel multiply assigned to more than 2 sectors. Thus, the number of subchannels of class 0 is set to 0 so as to avoid the waste of channel resources, while the number of sub-channels of class 3 is set to 0 in order to reduce the interference between the channels. [007] The channel assignment scheduler 1 uses the aforementioned equation 1 to calculate the number of subchannels of class 1 (S). Equation 1 is an equation derived to set the sum of the numbers of sub-channels of the class with the sub-channels assigned to only one sector. This is to maximize the number of sub-channels of class 1, which has the least interference between the channels. Then, the channel assignment scheduler 1 uses the aforementioned equation 2 to calculate the number of sub-channels of class 2 (S260). Equation 2 is an equation derived to set the ratio between the numbers of sub-channels of class 2 with sub-channels assigned to multiple sectors to correspond with the ratio between the numbers of sub-channels of the class 2 with sub-channels assigned to one sector. [008] If the sum of cell loads of each cell is determined to be larger than 1 but smaller or equal to 2, then the channel assignment scheduler 1 sets the number of sub-channels of classes 0 and 1 to 0 (S270). In this instance, there inevitably must be a sub-channel of class 3 (group of sub-channels multiply assigned to all 3 sectors). Also, since the number of sub-channels of class 3 increases when there is a sub-channel of class 1, the number of sub-channels of class 1 is set to 0. [009] The channel assignment scheduler 1 uses the aforementioned equation 3 to calculate the number of subchannels of class 3 (S280). Then, the channel assignment scheduler 1 uses aforementioned equation 4 to calculate the number of sub-channels of class 2 (S290) and aborts the procedure. Equations 3 and 4 calculate the number of channels assigned per class for each sector by using the ratio of the cell load of each sector to maximize the number of sub-channels of class 2, thereby minimizing the number of sub-channels of class 3. [0060] While the preferred embodiment of the present invention has been described as a certain method for calculating the number of assigned channels and for determining channels indexes, there exists many variations to the method described, according to the policy on how to manage the quality of the channels provided to the users. While the present invention has been described with respect to embodiments illustrated in the figures, these only serve for illustrative purposes only, and those skilled in the art will understand that various modifications and equivalent embodiments can be made. Therefore, the true technical scope of the present invention should be determined by the appended claims. Claims 4 1. An apparatus (0) capable of assigning sub-channels in an Orthogonal Frequency Division Multiplexing Access system with a plurality of sectors, comprising: 0 a plurality of sector channel management parts (1a, 1b, 1c), each sector channel management part (1a, 1b, 1c) configured to assign channels having assignable channel indexes in response to requests from users in a sector managed by the respective sector channel management part (1a, 1b, 1c), and to report sector load information regarding the total number of the requests from the users in the sector; and a channel assignment scheduler (1) configured to analyze the sector load information reported from each of the channel management parts to calculate the number of assignable channels per class for each of the sectors, to determine the assignable channel indexes per class for each of the sectors according to the number of assignable channels, and to forward the assignable channel indexes to each of the sector channel management parts, wherein, when the sector load information indicates that a sum of the cell loads for the sectors is smaller than or equal to one, the channel assignment scheduler (1) is configured to calculate the number of assignable channels such that the number of sub-channels of a class with sub-channels assigned to multiple sectors is set

11 to zero, and when the sector load information indicates that a sum of the cell loads for the sectors is greater than one, the channel assignment scheduler (1) is configured to calculate the number of assignable channels such that the sub-channels that are not assigned to any of the sectors are set to zero and a ratio of the number of subchannels in each class follows a ratio of loads of each sector, and wherein said class is a group consisting of channels to be assigned to a same number of sectors The apparatus (0) of claim 1, wherein the channel assignment scheduler (1) is configured to classify the number of assignable channels per class for each of the classes by the assignable sectors for the respective classes. 3. The apparatus (0) of claim 1, wherein the sector channel management part (1a, 1b, 1c) is configured to report the sector load information and channel quality information, which includes signal to noise ratios for the channels currently in use, to the channel assignment scheduler on every frame, and to receive the assignable channel indexes per class from the channel assignment scheduler on every frame. 4. The apparatus (0) of claim 3, wherein the sector channel management part (1a, 1b, 1c) is configured to sequentially assign the sub-channels, starting from the sub-channels of a class with sub-channels assigned to a least number of sectors.. The apparatus (0) of claim 3, wherein the channel assignment scheduler (1) is configured to determine the assignable channel indexes per class for each of the sectors according to the reported channel quality information The apparatus (0) of claim, wherein when the channel quality information indicates that a signal to noise ratio of an arbitrary sub-channel is below a predetermined threshold at a certain sector, the channel assignment scheduler (1) is configured to determine the channel index such that said sub-channel is not assigned to the certain sector. 7. The apparatus (0) of claim 6, wherein when the channel quality information indicates that the signal to noise ratio of the arbitrary sub-channel is above the predetermined threshold at the certain sector, the channel assignment scheduler (1) is configured to determine the channel index such that said sub-channel is assigned to the certain sector The apparatus (0) of claim 1, wherein each of the sector channel management parts (1a, 1b, 1c) is configured to generate and report the sector load information on every frame, and wherein the channel assignment scheduler (1) is configured to generate the assignable channel indexes for each of the sectors for every frame and forwards the assignable channel indexes to each of the sector channel management parts (1a, 1b, 1c). 9. The apparatus (0) of claim 1, wherein the channel assignment scheduler (1) is configured to calculate the number of assignable channels to set the number of sub-channels of a class with sub-channels not assigned to any of the sectors to 0 and to maximize the number of sub-channels of a class with sub-channels assigned to all of the sectors. 4. The apparatus (0) of claim 1, wherein the channel assignment scheduler (1) is configured to calculate the number of assignable channels to set the number of sub-channels of a class with sub-channels not assigned to any of the sectors to 0 and to minimize the number of sub-channels of a class with sub-channels assigned to all of the sectors The apparatus (0) of claim, wherein if the sector load information indicates that the sum of the cell loads for each of the sectors is smaller than or equal to 1, the channel assignment scheduler (1) is configured to calculate the number of assignable channels per class for each of the sectors, such that the number of sub-channels of a class with sub-channels assigned to multiple sectors is set to 0 and a ratio of the numbers of sub-channels of a class with sub-channels assigned to only one sector among the plurality of sectors corresponds to a ratio of the cell loads of each of the sectors. 12. The apparatus (0) of claim, wherein if the sector load information indicates that the sum of the cell loads of each of the sectors is greater than one and smaller than or equal to 2, the channel assignment scheduler (1) is configured to calculate the number of assignable channels per class for each sector, such that a ratio of the numbers of sub-channels of a class with sub-channels assigned to only one sector among the plurality of sectors corresponds to a ratio of the cell loads of each of the sectors, and a ratio of the numbers of sub-channels of a class with sub- 11

12 channels assigned to multiple sectors among the plurality of sectors corresponds to the ratio of the numbers of subchannels of a class with sub-channels assigned to only one sector among the plurality of sectors. 13. The apparatus (0) of claim, wherein if the sector load information indicates that the sum of the cell loads of each of the sectors is greater than 2 but smaller than or equal to 3, the channel assignment scheduler (1) is configured to calculate the number of channels assignable per class for each of the sectors using a ratio of the cell loads of each of the sectors to maximize the number of sub-channels of a class with sub-channels assigned to 2 sectors. 14. The apparatus (0) of claim 1, wherein the channel assignment scheduler (1) is configured to sequentially assign the channel indexes according to the number of sub-channels of each class, starting from the class with sub-channels assigned to the most sectors A method of assigning sub-channels in an Orthogonal Frequency Division Multiplexing Access system, comprising: receiving reports from each of a plurality of sector channel management parts on sector load information regarding the number of channel assignment requests from users in sectors managed by each of the sector channel management parts, calculating the number of assignable channels per class for each of the sectors by using the sector load information of each of the sectors, wherein, when the sector load information indicates that a sum of the cell loads for the sectors is smaller than or equal to one, the calculating the number of assignable channels calculates the number of assignable channels such that the number of sub-channels of a class with sub-channels assigned to multiple sectors is set to zero, and wherein, when the sector load information indicates that a sum of the cell loads for the sectors is greater than one, the calculating the number of assignable channels calculates the number of assignable channels such that the sub-channels that are not assigned to any of the sectors are set to zero and a ratio of the number of sub-channels in each class follows a ratio of loads of each sector, determining assignable channel indexes per class for each of the sectors according to the number of assignable channels per class for each of the sectors, and forwarding each of the assigned channel indexes to each corresponding sector channel management part, wherein the class is a group consisting of channels assigned to a same number of sectors The method of claim 1, wherein the calculating the number of assignable channels further comprises classifying the number of assignable channels per class for each sector by the assignable sectors for the respective classes. 17. The method of claim 1, wherein the receiving the report further comprises receiving the sector load information and channel quality information, which contains signal to noise ratios of channels currently in use, and the forwarding forwards the assignable channel indexes per class for each of the sectors to each of the sector channel management parts on every frame. 18. The method of claim 17, wherein the determining the channel index further comprises determining the assignable channel index per class for each of the sectors by the reported channel quality information The method of claim 18, wherein the determining the channel index further comprises determining the channel index such that a first sub-channel is not assigned to a certain sector, when the channel quality information indicates that a signal to noise ratio of the sub-channel is lower than a predetermined threshold. 0. The method of claim 19, wherein the determining the channel index further comprises determining the channel index such that the first sub-channel is again assigned to the certain sector, when the channel quality information indicates that a signal to noise ratio of the first sub-channel is higher than a predetermined threshold. 21. The method of claim 1, further comprising each of the sector channel management parts assigning one of channels having the forwarded assignable channel indexes, in response to the user s request in the sector managed by the respective sector channel management part. 22. The method of claim 21, wherein the assigning sequentially assigns the sub-channels, starting from the sub-channels of a class with sub-channels assigned to a least number of sectors. 12

13 1 23. The method of claim 1, wherein the calculating the number of assignable channels calculates the number of assignable channels such that the number of sub-channels of a class with sub-channels not assigned to any of the sectors is set to 0 and the number of sub-channels of a class with sub-channels assigned to all of the sectors is set to maximum. 24. The method of claim 1, wherein the calculating the number of assignable channels calculates the number of assignable channels such that the number of sub-channels of a class with sub-channels not assigned to any of the sectors is set to 0 and the number of sub-channels of a class with sub-channels assigned to all of the sectors is set to minimum. 2. The method of claim 24, wherein if the sector load information indicates that the sum of the cell loads for each of the sectors is smaller than or equal to 1, the calculating the number of assignable channels calculates the number of assignable channels per class for each of the sectors, such that the number of sub-channels of a class with subchannels assigned to multiple sectors is set to 0 and a ratio of the number of sub-channels of a class with subchannels assigned to only one sector among the plurality of sectors corresponds to a ratio of the cell loads of each of the sectors The method of claim 24, wherein if the sector load information indicates that the sum of the cell loads of each of the sectors is greater than one and smaller than or equal to 2, the calculating the number of assignable channels calculates the number of assignable channels per class for each sector, such that a ratio of the number of subchannels of a class with sub-channels assigned to only one sector among the plurality of sectors corresponds to a ratio of the cell loads of each of the sectors, and a ratio of the number of sub-channels of a class with sub-channels assigned to multiple sector among the plurality of sectors corresponds to the ratio of the number of sub-channels of a class with sub-channels assigned to only one sector among the plurality of sectors. 27. The method of claim 26, wherein, when 3 sectors (sector A, sector B, sector C) exist, the calculating the number of assignable channels calculates the numbers of sub-channels of a class with sub-channels assigned to only one sector using the equations (1), (2) and (3): (where, Sa, Sb, Sc is the number of sub-channels of each of the sectors A, B, and C respectively, and Wa, Wb, Wc is a cell load of sectors A, B, and C respectively), and said calculating the number of assignable channels calculates the numbers of sub-channels of a class with subchannels assigned to two sectors using the equations (4), () and (6): 13

14 1 (where, Sab, Sba are the numbers of sub-channels multiply assigned to sectors A and B, Sbc, Scb are the numbers of sub-channels multiply assigned to sectors B and C, Sca, Sac are the numbers of sub-channels multiply assigned to sector C and A). 28. The method of claim 24, wherein if the sector load information indicates that the sum of the cell loads of each of the sectors is greater than 2 and smaller than or equal to 3, the calculating the number of assignable channels calculates the number of channels assignable per class for each of the sectors using a ratio of the cell loads of each of the sectors to maximize the number of sub-channels of a class with sub-channels assigned to 2 sectors. 29. The method of claim 26, wherein, if 3 sectors (sector A, sector B, sector C) exist, the calculating the number of assignable channels calculates the numbers of sub-channels of a class with sub-channels assigned to all the sectors (Class 3) using equations (7), (8) and (9): 2 3 (where, Ta, Tb, Tc are the number of sub-channels of class 3 for each of the sectors A, B, C respectively, and Wa, Wb, Wc are a cell load of each of the sectors A, B, C respectively), and the calculating the number of assignable channels calculates the numbers of sub-channels of a class with subchannels assigned to two sectors using the equations (), (11) and (12): 4 0 (where, Sab, Sba are the numbers of sub-channels multiply assigned to sector A and B, Sbc, Scb are the numbers of sub-channels multiply assigned to sectors B and C, Sca, Sac are the numbers of sub-channels multiply assigned 14

15 to sectors C and A).. The method of claim 1, wherein the determining the channel index sequentially assigns the channel indexes according to the number of sub-channels of each class, starting from the class with sub-channels assigned to the most sectors. Patentansprüche 1. Vorrichtung (0), die in der Lage ist, Unterkanälen in einem Orthogonal-Frequenzteilungsmultiplex-Zugangssystem eine Vielzahl von Sektoren zuzuweisen, umfassend: 1 2 eine Vielzahl von Sektorkanalverwaltungsabschnitten (1a, 1b, 1c), wobei jeder Sektorkanalverwaltungsabschnitt (1a, 1b, 1c) konfiguriert ist, um Kanäle mit zuweisbaren Kanalindizes in Antwort auf Anforderungen von Benutzern in einem Sektor zuzuweisen, der durch den jeweiligen Sektorkanalverwaltungsabschnitt (1a, 1b, 1c) verwaltet wird, und um Sektorlastinformationen hinsichtlich der Gesamtanzahl der Anforderungen von den Benutzern in dem Sektor zu berichten; und einen Kanalzuweisungsplaner (1), der konfiguriert ist, um die Sektorlastinformationen zu analysieren, die aus jedem der Kanalverwaltungsabschnitte gemeldet sind, um die Anzahl von zuweisbaren Kanälen pro Klasse für jeden der Sektoren zu berechnen, die zuweisbaren Kanalindizes pro Klasse für jeden der Sektoren gemäß der Anzahl von zuweisbaren Kanälen zu bestimmen, und um die zuweisbaren Kanalindizes zu jedem der Sektorkanalverwaltungsabschnitte weiterzuleiten, wobei, wenn die Sektorlastinformationen anzeigen, dass eine Summe der Zelllasten für die Sektoren kleiner oder gleich eins ist, der Kanalzuweisungsplaner (1) konfiguriert ist, um die Anzahl von zuweisbaren Kanälen derart zu berechnen, dass die Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die mehreren Sektoren zugewiesen sind, auf null gesetzt wird, und falls die Sektorlastinformationen anzeigen, dass eine Summe der Zelllasten für die Sektoren größer als eins ist, der Kanalzuweisungsplaner (1) konfiguriert ist, um die Anzahl von zuweisbaren Kanälen derart zu berechnen, dass die Unterkanäle, die keinem der Sektoren zugewiesen sind, auf null gesetzt werden, und ein Verhältnis der Anzahl von Unterkanälen in jeder Klasse einem Verhältnis von Lasten von jedem Sektor nachfolgt, und wobei die Klasse eine Gruppe ist, die aus Kanälen besteht, die einer gleichen Anzahl von Sektoren zuzuweisen sind Vorrichtung (0) gemäß Anspruch 1, wobei der Kanalzuweisungsplaner (1) konfiguriert ist, um die Anzahl von zuweisbaren Kanälen pro Klasse für jede der Klassen durch die zuweisbaren Sektoren für die jeweiligen Klassen zu klassifizieren. 3. Vorrichtung (0) gemäß Anspruch 1, wobei der Sektorkanalverwaltungsabschnitt (1a, 1b, 1c) konfiguriert ist, um die Sektorlastinformationen und Kanalqualitätsinformationen, die Signal-zu-Rauschverhältnisse für die momentan verwendeten Kanäle umfassen, zu dem Kanalzuweisungsplaner auf jedem Rahmen zu berichten, und um die zuweisbaren Kanalindizes pro Klasse aus dem Kanalzuweisungsplaner auf jedem Rahmen zu empfangen Vorrichtung (0) gemäß Anspruch 3, wobei der Sektorkanalverwaltungsabschnitt (1a, 1b, 1c) konfiguriert ist, um die Unterkanäle, angefangen von den Unterkanälen einer Klasse mit Unterkanälen, die einer kleinsten Anzahl von Sektoren zugewiesen ist, sequenziell zuzuweisen.. Vorrichtung (0) gemäß Anspruch 3, wobei der Kanalzuweisungsplaner (1) konfiguriert ist, um die zuweisbaren Kanalindizes pro Klasse für jeden der Sektoren gemäß den gemeldeten Kanalqualitätsinformationen zu bestimmen Vorrichtung (0) gemäß Anspruch, wobei, wenn die Kanalqualitätsinformationen anzeigen, dass ein Signal-zu- Rauschverhältnis eines beliebigen Unterkanals unterhalb eines vorbestimmten Schwellwerts bei einem bestimmten Sektor liegt, dann der Kanalzuweisungsplaner (1) konfiguriert ist, um den Kanalindex derart zu bestimmen, dass der Unterkanal dem bestimmten Sektor nicht zugewiesen wird. 7. Vorrichtung (0) gemäß Anspruch 6, wobei, wenn die Kanalqualitätsinformationen anzeigen, dass das Signal-zu- Rauschverhältnis eines beliebigen Unterkanals oberhalb des vorbestimmten Schwellwerts bei dem bestimmten Sektor liegt, dann der Kanalzuweisungsplaner (1) konfiguriert ist, um den Kanalindex derart zu bestimmen, dass der Unterkanal dem bestimmten Sektor zugewiesen wird. 1

16 8. Vorrichtung (0) gemäß Anspruch 1, wobei jeder der Sektorkanalverwaltungsabschnitte (1a, 1b, 1c) konfiguriert ist, um die Sektorlastinformationen auf jedem Rahmen zu erzeugen und zu berichten, und wobei der Kanalzuweisungsplaner (1) konfiguriert ist, um die zuweisbaren Kanalindizes für jeden der Sektoren für jeden Rahmen zu erzeugen und die zuweisbaren Kanalindizes zu jedem der Sektorkanalverwaltungsabschnitte (1a, 1b, 1c) weiterzuleiten. 9. Vorrichtung (0) gemäß Anspruch 1, wobei der Kanalzuweisungsplaner (1) konfiguriert ist, um die Anzahl von zuweisbaren Kanälen zu berechnen, um die Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die keinem der Sektoren zugewiesen sind, auf null zu setzen, und um die Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die allen Sektoren zugewiesen sind, zu maximieren. 1. Vorrichtung (0) gemäß Anspruch 1, wobei der Kanalzuweisungsplaner (1) konfiguriert ist, um die Anzahl von zuweisbaren Kanälen zu berechnen, um die Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die keinem der Sektoren zugewiesen sind, auf null zu setzen, und um die Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die allen Sektoren zugewiesen sind, zu minimieren. 11. Vorrichtung (0) gemäß Anspruch, wobei, falls die Sektorlastinformationen anzeigen, dass die Summe der Zelllasten für jeden der Sektoren kleiner oder gleich eins ist, der Kanalzuweisungsplaner (1) konfiguriert ist, um die Anzahl von zuweisbaren Kanälen pro Klasse für jeden der Sektoren derart zu berechnen, dass die Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die mehreren Sektoren zugewiesen sind, auf null gesetzt wird, und dass ein Verhältnis der Anzahlen von Unterkanälen einer Klasse mit Unterkanälen, die lediglich einem Sektor unter der Vielzahl von Sektoren zugewiesen sind, einem Verhältnis der Zelllasten von jedem der Sektoren entspricht Vorrichtung (0) gemäß Anspruch, wobei, falls die Sektorlastinformationen anzeigen, dass die Summe der Zelllasten von jedem der Sektoren größer als eins und kleiner oder gleich zwei ist, der Kanalzuweisungsplaner (1) konfiguriert ist, um die Anzahl von zuweisbaren Kanälen pro Klasse für jeden Sektor derart zu berechnen, dass ein Verhältnis der Anzahlen von Unterkanälen einer Klasse mit Unterkanälen, die lediglich einem Sektor unter der Vielzahl von Sektoren zugewiesen sind, einem Verhältnis der Zelllasten von jedem der Sektoren entspricht, und dass ein Verhältnis der Anzahlen von Unterkanälen einer Klasse mit Unterkanälen, die mehreren Sektoren unter der Vielzahl von Sektoren zugewiesen sind, dem Verhältnis der Anzahlen von Unterkanälen einer Klasse mit Unterkanälen entspricht, die lediglich einem Sektor unter der Vielzahl von Sektoren zugewiesen sind Vorrichtung (0) gemäß Anspruch, wobei, falls die Sektorlastinformationen anzeigen, dass die Summe der Zelllasten von jedem der Sektoren größer als zwei, aber kleiner oder gleich drei ist, der Kanalzuweisungsplaner (1) konfiguriert ist, um die Anzahl von pro Klasse zuweisbaren Kanälen für jeden der Sektoren unter Verwendung eines Verhältnisses der Zelllasten von jedem der Sektoren zu berechnen, um die Anzahl von Unterkanälen einer Klasse mit Unterkanälen zu maximieren, die zwei Sektoren zugewiesen sind. 14. Vorrichtung (0) gemäß Anspruch 1, wobei der Kanalzuweisungsplaner (1) konfiguriert ist, um die Kanalindizes gemäß der Anzahl von Unterkanälen jeder Klasse, angefangen von der Klasse mit Unterkanälen, die den meisten Sektoren zugewiesen sind, sequenziell zuzuweisen Verfahren zum Zuweisen von Unterkanälen in einem Orthogonal-Frequenzteilungsmultiplex-Zugangssystem, umfassend: Empfangen von Berichten von jedem einer Vielzahl von Sektorkanalverwaltungsabschnitten bezüglich Sektorlastinformationen hinsichtlich der Anzahl von Kanalzuweisungsanforderungen von Benutzern in Sektoren, die durch jeden der Sektorkanalverwaltungsabschnitte verwaltet sind, Berechnen der Anzahl von zuweisbaren Kanälen pro Klasse für jeden der Sektoren durch Verwenden der Sektorlastinformationen von jedem der Sektoren, wobei, wenn die Sektorlastinformationen anzeigen, dass eine Summe der Zelllasten für die Sektoren kleiner oder gleich eins ist, das Berechnen der Anzahl von zuweisbaren Kanälen die Anzahl von zuweisbaren Kanälen derart berechnet, dass die Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die mehreren Sektoren zugewiesen sind, auf null gesetzt wird, und wobei, wenn die Sektorlastinformationen anzeigen, dass eine Summe der Zelllasten für die Sektoren größer als eins ist, das Berechnen der Anzahl von zuweisbaren Kanälen die Anzahl von zuweisbaren Kanälen derart berechnet, dass die Unterkanäle, die keinem der Sektoren zugewiesen sind, auf null gesetzt wird, und dass ein Verhältnis der Anzahl von Unterkanälen in jeder Klasse einem Verhältnis von Lasten von jedem Sektor nachfolgt, 16

17 Bestimmen von zuweisbaren Kanalindizes pro Klasse für jeden der Sektoren gemäß der Anzahl von zuweisbaren Kanälen pro Klasse für jeden der Sektoren, und Weiterleiten von jedem der zugewiesenen Kanalindizes zu jedem entsprechenden Sektorkanalverwaltungsabschnitt, wobei die Klasse eine Gruppe ist, die aus Kanälen besteht, die einer gleichen Anzahl von Sektoren zugewiesen sind. 16. Verfahren gemäß Anspruch 1, wobei das Berechnen der Anzahl von zuweisbaren Kanälen weiterhin umfasst: Klassifizieren der Anzahl von zuweisbaren Kanälen pro Klasse für jeden Sektor durch die zuweisbaren Sektoren für die jeweiligen Klassen Verfahren gemäß Anspruch 1, wobei das Empfangen des Berichts weiterhin umfasst: Empfangen der Sektorlastinformationen und von Kanalqualitätsinformationen, die Signal-zu-Rauschverhältnisse der momentan verwendeten Kanäle umfassen, und das Weiterleiten die zuweisbaren Kanalindizes pro Klasse für jeden der Sektoren zu jedem der Sektorkanalverwaltungsabschnitte auf jedem Rahmen weiterleitet Verfahren gemäß Anspruch 17, wobei das Bestimmen des Kanalindex weiterhin umfasst: Bestimmen des zuweisbaren Kanalindex pro Klasse für jeden der Sektoren durch die berichteten Kanalqualitätsinformationen. 19. Verfahren gemäß Anspruch 18, wobei das Bestimmen des Kanalindex weiterhin umfasst: Bestimmen des Kanalindex derart, dass ein erster Unterkanal keinem bestimmten Sektor zugewiesen wird, wenn die Kanalqualitätsinformationen anzeigen, dass ein Signal-zu-Rauschverhältnis des Unterkanals kleiner als ein vorbestimmter Schwellwert ist.. Verfahren gemäß Anspruch 19, wobei das Bestimmen des Kanalindex weiterhin umfasst: Bestimmen des Kanalindex derart, dass der erste Unterkanal wieder dem bestimmten Sektor zugewiesen wird, wenn die Kanalqualitätsinformationen anzeigen, dass ein Signal-zu-Rauschverhältnis des ersten Unterkanals größer als ein vorbestimmter Schwellwert ist. 21. Verfahren gemäß Anspruch 1, weiterhin umfassend, von jedem der Sektorkanalverwaltungsabschnitte, Zuweisen von einem der Kanäle mit den weitergeleiteten zuweisbaren Kanalindizes, in Antwort auf die Anforderungen der Benutzer in dem Sektor, der durch den jeweiligen Sektorkanalverwaltungsabschnitt verwaltet ist Verfahren gemäß Anspruch 21, wobei das Zuweisen die Unterkanäle, angefangen von den Unterkanälen einer Klasse mit Unterkanälen, die einer kleinsten Anzahl von Sektoren zugewiesen sind, sequenziell zuweist. 23. Verfahren gemäß Anspruch 1, wobei das Berechnen der Anzahl von zuweisbaren Kanälen die Anzahl von zuweisbaren Kanälen derart berechnet, dass die Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die keinem der Sektoren zugewiesen sind, auf null gesetzt wird, und die Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die allen Sektoren zugewiesen sind, auf Maximum gesetzt wird Verfahren gemäß Anspruch 1, wobei das Berechnen der Anzahl von zuweisbaren Kanälen die Anzahl von zuweisbaren Kanälen derart berechnet, dass die Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die keinem der Sektoren zugewiesen sind, auf null gesetzt wird, und die Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die allen Sektoren zugewiesen sind, auf Minimum gesetzt wird Verfahren gemäß Anspruch 24, wobei, falls die Sektorlastinformationen anzeigen, dass die Summe der Zelllasten für jeden der Sektoren kleiner oder gleich eins ist, das Berechnen der Anzahl von zuweisbaren Kanälen die Anzahl von zuweisbaren Kanälen pro Klasse für jeden der Sektoren derart berechnet, dass die Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die mehreren Sektoren zugewiesen sind, auf null gesetzt wird, und dass ein Verhältnis der Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die lediglich einem Sektor unter der Vielzahl von Sektoren zugewiesen sind, einem Verhältnis der Zelllasten von jedem der Sektoren entspricht. 26. Verfahren gemäß Anspruch 24, wobei, falls die Sektorlastinformationen anzeigen, dass die Summe der Zelllasten von jedem der Sektoren größer als eins und kleiner oder gleich zwei ist, das Berechnen der Anzahl von zuweisbaren Kanälen die Anzahl von zuweisbaren Kanälen pro Klasse für jeden Sektor derart berechnet, dass ein Verhältnis der Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die lediglich einem Sektor unter der Vielzahl von Sektoren zugewiesen sind, einem Verhältnis der Zelllasten von jedem der Sektoren entspricht, und dass ein Ver- 17

18 hältnis der Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die mehreren Sektoren unter der Vielzahl von Sektoren zugewiesen sind, dem Verhältnis der Anzahl von Unterkanälen einer Klasse mit Unterkanälen entspricht, die lediglich einem Sektor unter der Vielzahl von Sektoren zugewiesen sind. 27. Verfahren gemäß Anspruch 26, wobei, wenn drei Sektoren (Sektor A, Sektor B, Sektor C) vorliegen, das Berechnen der Anzahl von zuweisbaren Kanälen die Anzahl von Unterkanälen einer Klasse mit Unterkanälen, die lediglich einem Sektor zugewiesen sind, unter Verwendung der Gleichungen (1), (2) und (3) berechnet: 1 2 (wobei Sa, Sb, Sc die Anzahl von Unterkanälen jeweils von jedem der Sektoren A, B, C ist, und wobei Wa, Wb, Wc jeweils eine Zelllast der Sektoren A, B und C ist), und das Berechnen der Anzahl von zuweisbaren Kanälen die Anzahlen von Unterkanälen einer Klasse mit Unterkanälen, die zwei Sektoren zugewiesen sind, unter Verwendung der Gleichungen (4), () und (6) berechnet: (wobei Sab und Sba die Anzahlen von Unterkanälen sind, die Sektoren A und B mehrfach zugewiesen sind, Sbc und Scb die Anzahlen von Unterkanälen sind, die den Sektoren mehrfach B und C zugewiesen sind, Sca und Sac die Anzahlen von Unterkanälen sind, die dem Sektor C und A mehrfach zugewiesen sind). 28. Verfahren gemäß Anspruch 24, wobei, falls die Sektorlastinformationen anzeigen, dass die Summe der Zelllasten von jedem der Sektoren größer als zwei und kleiner oder gleich drei sind, das Berechnen der Anzahl von zuweisbaren Kanälen die Anzahl von pro Klasse zuweisbaren Kanälen für jeden der Sektoren unter Verwendung eines Verhältnisses der Zelllasten von jedem der Sektoren berechnet, um die Anzahl von Unterkanälen einer Klasse mit Unterkanälen zu maximieren, die zwei Sektoren zugewiesen sind. 29. Verfahren gemäß Anspruch 26, wobei, falls drei Sektoren (Sektor A, Sektor B, Sektor C) vorliegen, das Berechnen der Anzahl von zuweisbaren Kanälen die Anzahlen von Unterkanälen einer Klasse mit Unterkanälen, die allen Sektoren (Klasse 3) zugewiesen sind, unter Verwendung von Gleichungen (7), (8) und (9) berechnet: 18

19 1 (wobei Ta, Tb, Tc die Anzahl von Unterkanälen der Klasse 3 jeweils für jeden der Sektoren A, B, C sind, und Wa, Wb, Wc jeweils eine Zelllast von jedem der Sektoren A, B, C sind), und das Berechnen der Anzahl von zuweisbaren Kanälen die Anzahlen von Unterkanälen einer Klasse mit Unterkanälen, die zwei Sektoren zugewiesen sind, unter Verwendung der Gleichungen (), (11) und (12) berechnet: 2 3 (wobei Sab und Sba die Anzahlen von Unterkanälen sind, die den Sektoren A und B mehrfach zugewiesen sind, Sbc und Scb die Anzahlen von Unterkanälen sind, die den Sektoren B und C mehrfach zugewiesen sind, und Sca und Sac die Anzahlen von Unterkanälen sind, die den Sektoren C und A mehrfach zugewiesen sind).. Verfahren gemäß Anspruch 1, wobei das Bestimmen des Kanalindex die Kanalindizes gemäß der Anzahl von Unterkanälen von jeder Klasse, angefangen von der Klasse mit Unterkanälen, die den meisten Sektoren zugewiesen sind, sequenziell zuweist. 4 Revendications 0 1. Appareil (0) apte à attribuer des sous-canaux dans un système à Accès par Multiplexage par Répartition Orthogonale de la Fréquence avec une pluralité de secteurs, comprenant : une pluralité de parties (1a, 1b, 1c) de gestion de canaux de secteurs, chaque partie (1a, 1b, 1c) de gestion de canaux de secteurs configurée pour attribuer des canaux ayant des index de canaux attribuables en réponse à des demandes provenant d utilisateurs dans un secteur géré par la partie (1a, 1b, 1c) de gestion de canaux de secteurs respective, et pour annoncer une information de charge de secteur se rapportant au nombre total des demandes provenant des utilisateurs dans le secteur ; et un programmateur (1) d attribution de canaux configuré pour analyser l information de charge de secteur annoncée de chacune des parties de gestion de canaux afin de calculer le nombre de canaux attribuables par classe pour chacun des secteurs, pour déterminer les index de canaux attribuables par classe pour chacun 19

20 des secteurs en fonction du nombre de canaux attribuables, et pour envoyer les index de canaux attribuables à chacune des parties de gestion de canaux de secteurs, dans lequel, lorsque l information de charge de secteur indique qu une somme des charges de cellules pour les secteurs est inférieure ou égale à un, le programmateur (1) d attribution de canaux est configuré pour calculer le nombre de canaux attribuables de façon à ce que le nombre de sous-canaux d une classe avec des sous-canaux attribués à des secteurs multiples soit fixé à zéro, et lorsque l information de charge de secteur indique qu une somme des charges de cellules pour les secteurs est supérieure à un, le programmateur (1) d attribution de canaux est configuré pour calculer le nombre de canaux attribuables de façon à ce que les sous-canaux qui ne sont pas attribués à un quelconque parmi les secteurs soient fixés à zéro et qu un rapport du nombre de sous-canaux dans chaque classe suive un rapport de charges de chaque secteur, et dans lequel ladite classe est un groupe consistant en des canaux devant être attribués à un même nombre de secteurs Appareil (0) selon la revendication 1, dans lequel le programmateur (1) d attribution de canaux est configuré pour classer le nombre de canaux attribuables par classe pour chacune des classes par les secteurs attribuables pour les classes respectives. 3. Appareil (0) selon la revendication 1, dans lequel la partie (1a, 1b, 1c) de gestion de canaux de secteurs est configurée pour annoncer l information de charge de secteur et une information de qualité de canaux, qui inclut des rapports signal-bruit pour les canaux couramment utilisés, au programmateur d attribution de canaux sur chaque trame, et pour recevoir les index de canaux attribuables par classe du programmateur d attribution de canaux sur chaque trame Appareil (0) selon la revendication 3, dans lequel la partie (1a, 1b, 1c) de gestion de canaux de secteurs est configurée pour attribuer séquentiellement les sous-canaux, en commençant à partir des sous-canaux d une classe avec des sous-canaux attribués à un nombre moindre de secteurs.. Appareil (0) selon la revendication 3, dans lequel le programmateur (1) d attribution de canaux est configuré pour déterminer les index de canaux attribuables par classe pour chacun des secteurs en fonction de l information de qualité de canaux annoncée Appareil (0) selon la revendication, dans lequel, lorsque l information de qualité de canaux indique qu un rapport signal-bruit d un sous-canal arbitraire est inférieur à un seuil prédéterminé au niveau d un certain secteur, le programmateur (1) d attribution de canaux est configuré pour déterminer l index de canal de telle façon que ledit sous-canal n est pas attribué au certain secteur. 7. Appareil (0) selon la revendication 6, dans lequel, lorsque l information de qualité de canaux indique que le rapport signal-bruit du sous-canal arbitraire est supérieur au seuil prédéterminé au niveau du certain secteur, le programmateur (1) d attribution de canaux est configuré pour déterminer l index de canal de telle façon que ledit souscanal est attribué au certain secteur Appareil (0) selon la revendication 1, dans lequel chacune des parties (1a, 1b, 1c) de gestion de canaux de secteurs est configurée pour générer et annoncer l information de charge de secteur sur chaque trame, et dans lequel le programmateur (1) d attribution de canaux est configuré pour générer les index de canaux attribuables pour chacun des secteurs pour chaque trame et envoie les index de canaux attribuables à chacune des parties (1a, 1b, 1c) de gestion de canaux de secteurs Appareil (0) selon la revendication 1, dans lequel le programmateur (1) d attribution de canaux est configuré pour calculer le nombre de canaux attribuables afin de fixer le nombre de sous-canaux d une classe avec des souscanaux non attribués à l un quelconque parmi les secteurs à 0 et de maximiser le nombre de sous-canaux d une classe avec des sous-canaux attribués à tous les secteurs.. Appareil (0) selon la revendication 1, dans lequel le programmateur (1) d attribution de canaux est configuré pour calculer le nombre de canaux attribuables afin de fixer le nombre de sous-canaux d une classe avec des souscanaux non attribués à l un quelconque parmi les secteurs à 0 et de minimiser le nombre de sous-canaux d une classe avec des sous-canaux attribués à tous les secteurs.

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