MXPA06005160A

MXPA06005160A - Transmission power range setting during channel assignment for interference balancing in a cellular wireless communication system

Info

Publication number: MXPA06005160A
Application number: MXPA/A/2006/005160A
Authority: MX
Inventors: Christian Wengerter; Edler Von Elbwart Alexander Golitschek
Original assignee: Matsushita Electric Industrial Co Ltd
Priority date: 2003-11-06
Filing date: 2006-05-08
Publication date: 2007-04-20

Abstract

The present invention relates to a method for balancing the distribution of interference between radio cells in a wireless communication system comprising cells in which subcarrier blocks are used for communication. A number of adjacent cells build a cell cluster. Moreover, the present invention relates to a corresponding method adapted for use in a system in which multi beam antennas or multiple antennas are used. Furthermore, the present invention relates to base stations performing the above method as well as a communication system comprising the base stations. To reduce the large average SIR variations without causing additional SIR estimation, measurement and calculation problem as introduced with power control the invention suggests to group subcarrier blocks into a plurality of subcarrier block sets in each cell of a cell cluster, to determine transmission power ranges for each of the cells of saidcell cluster, and to assign transmission power ranges to the subcarrier block sets to perform TPC within the ranges.

Description

EQUILIBRIUM OF INTERFERENCE IN A WIRELESS COMMUNICATIONS SYSTEM FIELD OF THE INVENTION The present invention relates to a method for balancing the interference distribution between radio cells in a wireless communication system. The system comprises a plurality of radio cells in which a plurality of subcarrier blocks are used for communication, wherein each subcarrier block comprises a plurality of subcarriers. In addition, a number of adjacent radio cells constitutes a group of cells. In addition, the present invention relates to a corresponding method adapted for use in a system in which base stations divided into sectors are used. In addition, the present invention relates to base stations performing the above method as well as a communication system comprising the base stations.

ANTECEDENTS OF THE TECHNIQUE In packet-based cellular mobile communication systems, Dynamic Channel Allocation (DCA) schemes are popular, as they are an efficient tool for increasing system performance (air interface). The DCA schemes use the short-term fluctuations (fast fade) of the link channel quality between base stations (BS) and mobile stations (MS). In such a system a so-called scheduler (usually part of the base station) atts to allocate system resources preferably to mobile stations in favorable channel conditions. In the time domain DCA works on a frame-by-frame basis, where a frame duration is typically in the region of (sub-) milliseconds. Furthermore, depending on the multiple access scheme, the air interface resources are divided into, for example, code and / or frequency domain. The following description focuses on the downlink scenario (BS transmits to MS), however without losing the generality, the DCA can also be applied to the uplink (MS transmits to BS). In any case, the programmer who performs the DCA needs to have detailed channel knowledge of the BS-MS links, which are gathered through the channel estimation. If the programmer is located in the network and the measurement is made in the MS, the channel information is signaled from MS to BS. It is important that the channel quality is measured on an instantaneous basis in order to reflect the instantaneous received signal energy and instantaneous interference. In Frequency Division Multiple Access (FDMA) systems, the DCA is performed in time-frequency domain, since the physical layer channels are defined in the frequency domain. Typically, the channel quality varies significantly in the frequency domain (selective frequency fading). From that, depending on the conditions of the channels on all available frequencies and all active mobile stations, the programmer can assign the channels dynamically at each instant of programming to specify BS-MS links. In an OFDMA (Orthogonal Frequency Division Multiple Access) system, the frequency resource is divided into narrowband subcarriers, which typically experience a flat fading. Here, the programmer usually dynamically allocates subcarrier blocks (containing M adjacent or separate subcarriers) to a specific MS in order to use favorable channel conditions in a link. An example of such a system by Rohling and others is known, "Performance or fan OFDM-TDMA mobile communication system", IEEE Proceedings on the Conference on Vehicular Technology (VTC 1996), Atlanta, 1996. In the case of a CDMA (Multiple Access) by Code Division) the system resources are defined in code domain and, therefore, the programmer dynamically assigns codes to specify BS-MS links. It should be noted, that in contrast to the FDMA, for a given link the channel quality is similar for all resources / codes (the fading is not code selective) and, from that, in code domain the DCA is made with respect to the number of codes to be assigned to a specific MS and not in what codes to assign. The DCA is focused on time domain programming that uses fast fading characteristics. HSDPA (High Speed Downlink Packet Access) within the 3GPP standard (3rd Generation Partnership Project) is such a CDMA system that DCA uses. An MC-CDMA (Multiple Carrier CDMA) system can be considered as a combination of CDMA and (O) FDMA. From that, the DCA can be performed in both code and frequency domain. Generally, the DCA through efficiency increases with the number of active mobile stations in a cell, since this increases the number of links in good channel conditions and, therefore, increases the probability that a channel is programmed in favorable conditions (multiple user diversity). Typically, the DCA is combined with link adaptation techniques such as Adaptive Modulation and Coding (AMC) and Hybrid Automatic Repetition Request (ARQ). In addition, the DCA can be combined with energy control schemes, where the energy assigned to a specific channel (in code, frequency domain is controlled in order to compensate for variations in channel energy and / or to support the operation of AMC.

Properties of controlled systems without power As described in the previous section, for the operation of DCA efficient programmer in the BS when it assumes that a controlled system without power needs detailed knowledge of the instantaneous quality of all the channels on all available subcarrier blocks and all the BS-MS links involved. Considering a multiple cell scenario of DCA OFDMA and a frequency reuse factor of 1, the system is typically of limited interference, that is, the channel quality per subcarrier block is defined mainly through the signal ratio (SIR) (S) to interference (I), where the interference is dominated by inter-cell interference (sub-channel interference) caused by transmissions in the respective channel (subcarrier block) in adjacent cells (C denotes the group of cells adjacent): S S C) C aHcladcleCana i SIR = - «c In the case of an OFDMA system with DCA and selective frequency fading, the instantaneous SIR (t) for a given link for a mobile station m varies over the b subcarrier blocks, since both the signal and the interference experience fading: As mentioned above, the performance of a system that employs DCA and AMC extensively depends on the accuracy of the SIR estimate. Therefore, according to equation (2) the following problems occur: All the values in equation (2) experience rapid fading and will change between the point in time of the measurement and the point in time of the actual transmission (after making the selection of DCA and AMC). This delay causes the inaccurate operation of DCA and AMC. The delay even increases, if the measurement is made in the MS and needs to be fed back by the BS signaling. The number of interferences in the denominator depends on the actual use (distribution) of the subcarrier block in adjacent cells, that is, depending on the actual load in the adjacent cells some subcarrier blocks may not be used. Generally, at the point in time of the measurement, the use of the subcarrier block at the point in time of transmission in adjacent cells is unknown due to the following reasons: The channel quality measurement is performed based on an old interference caused by the distribution of subcarrier block (programming) in the adjacent cells (measurement for n-do framework is done in the (nk) -do frame, when the distribution of the subcarrier is most likely different). In addition, there is the distribution problem so called chicken and egg. In cell A, the subcarrier and AMC block distribution can only be made after the measurement / calculation of SIR has been performed in cell A, which requires knowledge of the distribution of subcarrier block in cell B (adjacent cells) ). However, before the distribution of the subcarrier block in cell B can be performed, the SIR measurement / calculation in cell B needs to be performed, which requires knowledge of the distribution of subcarrier block in cell A. In the case of the chicken and egg problem can be avoided / solved through for example an iterative procedure, the signaling of eg the distribution status between the base stations would be required. However, since the programming frames are in the millisecond region, the signaling would introduce additional significant delay. Additionally, without any power control, the average SIR (ignoring fast fading influences) for a BS-MS link depends strongly on the geometry (eg distance to BS) of the MS that causes the following effects: With increasing distance between BS and MS, the SIR of the respective links decreases, since the average received signal energy decreases and the energy of the average received interference increases. This results in a significantly lower achievable data rate per subcarrier block for links to mobile stations in low geometry. The difference in average SIR can only be in the order of 10 dB which requires a large dynamic scale for the definition of AMC scheme. This leads to an increased amount of signaling, since the number of required combinations of modulation schemes and code rates increases when the granularity of AMC is maintained with respect to smaller dynamic scales. Compared to energy-controlled systems, for non-energy controlled systems it is more likely that multi-level modulation schemes (eg, 8-PSK, 16-QAM, 64-QAM, etc.) are chosen for links for mobile stations in geometry high. Although this increases the available throughput for those mobile stations, the performance of the total system can be decreased compared to a system, where the available energy is distributed so that only modulation schemes without multiple level (for example, QPSK) are used. This is caused by the reduced energy efficiency of multiple level modulation schemes. Compared to controlled power systems, for non-powered controlled systems it is more likely that low-geometry mobile stations will not receive any of the data with individual transmission attempts, but would require several retransmissions. Therefore, the average number of transmissions (ARQ retransmissions) increases, which in turn increases the transmission delay and feedback signaling, as well as decreases the bandwidth efficiency. The transmission of data to mobile stations in high geometry is interrupted in the time domain, since higher average modulation and coding schemes can be selected. This results in an interrupt subcarrier block distribution. This will make the SIR estimate according to the most difficult equation (2), since the subcarrier block distribution changes more frequently.

Properties of Controlled Energy Systems The DCA and AMC can also be combined with Energy Control (PC) schemes. When using PC, the system attempts to compensate for fluctuations in the received signal energy due to loss of signal path, shading effects (slow fade) and / or fast fading effects. Generally, PC schemes can be classified into two categories: fast PC and slow PC. In contrast to PC-less systems, for slow PC systems, the average SIR does not depend on the geometry of the mobile stations, assuming only slow fading effects and unlimited minimum and maximum transmission energy. From that, the data rates obtainable per subcarrier block do not depend on the MS position. However, it should be noted that the slow PC can only operate within certain limits (dynamic scale of the control commands), ie the power compensation may not be sufficient or fast enough for any link. The rapid energy control is usually carried out jointly with the AMC in order to adapt the transmission speed to short-term fluctuations and in order to optimize the use of total energy. With slow / fast PC the problem of estimation / measurement / calculation of instantaneous SIR as outlined in the previous sections above, is more severe compared to the case without PC. That is, the unknown number of interference components of the sum in the denominator equation (2) not only experiences rapid fading, but varies significantly in amplitude due to the PC in adjacent cells, i.e., the interference of between the cells in a The given subcarrier block of a given adjacent cell may vary from frame to frame in tens of dB depending on which MS is programmed in the respective subcarrier block, since the transmitted energy can vary significantly depending mainly on the location of MS. This is especially critical if the interference is dominated by few obstacles, since there is no average interference effect.

BRIEF DESCRIPTION OF THE INVENTION An object of the present invention is to reduce large interference fluctuations between cells caused by energy control schemes. The object is resolved by the subject matter of the independent claims. The different embodiments of the present invention are subjects of the subject matter of the dependent claims. In more detail, the present invention provides a method for balancing the interference distribution between radio cells in a wireless communication system, the system can comprise a plurality of radio cells in which a plurality of subcarrier blocks are used for communication . Each subcarrier block may comprise a plurality of subcarriers and a number of adjacent radio cells may construct a group of cells. In addition, it should be noted that the term "subcarrier block" should also be understood as a channel (physical layer) in a communication system based on FDM (Division Multiplexer Frequency), for example, in the case where the number of subcarriers of a subcarrier block equals one. According to the method, the subcarrier blocks can be grouped into a plurality of subcarrier block groups (SBSs) in each radio cell of the group of cells. In addition, a plurality of transmit power scales can be determined for each of the cell group radio cells, wherein the scale of transmit power defines a scale of transmit power levels used for transmission power control , and the plurality of transmission power scales can be assigned to the radio cell subcarrier block groups of the group of cells. It is noted that according to this modality, the number of transmission energy scales and subcarrier block groups are independent of each other, that is, the same does not necessarily have to be the same number. According to another embodiment, the radio cells of the cell group may comprise corresponding subcarrier block groups having the same subcarriers. More specifically, a transmission power scale as mentioned above can define a range of transmission energy levels used for energy control of a communication channel (subcarrier block) to a mobile communication terminal, i.e. chooses a subcarrier block for communication, only a predetermined transmission power level scale of the subcarrier group of blocks to which the respective subcarrier block belongs for energy control can be used. The plurality of transmission power scales can assign to the subcarrier block groups of the radio cells of the cell group, so that in a single radio cell, there is a location of each of the plurality of energy scales of the cell group. transmission for a group of subcarrier blocks of the individual radio cell, and there is a location of each of the plurality of transmission power scales for one of the corresponding subcarrier block groups in the radio cells of the group of cells. This rule for the distribution of energy scales can be specifically applicable in situations in which the number of available transmission power scales is chosen to be larger or equal to the number of subcarrier block groups. In addition, the plurality of transmission power scales can be assigned to the subcarrier block groups of the radio cells of the group of cells so that in a single radio cell, there is a location of each of the plurality of block groups. subcarrier of the individual radio cell for a transmission power scale, and there is a location of each of the corresponding subcarrier block groups in the radio cells of the cell group for one of the plurality of transmission power scales. In contrast to the illustrative distribution rule mentioned above, this rule for energy scale distribution can be especially applicable in situations in which the number of available subcarrier block groups is chosen to be larger or equal to the number of energy scales of transmission. According to another embodiment, the location used in the two allocation rules mentioned above is a single or one-to-one location. This means that, for example, when the transmission power scales are located for the subcarrier block groups, each of the transmission power scales is located to a corresponding individual subcarrier block groups. If the subcarrier block groups are located on the transmission power scales, each group of subcarrier blocks is located at a corresponding individual transmission power scale. To simplify the distribution of transmission power scales and subcarrier block groups, their number can be determined based on the number of radio cells that make up a cell group. From that, in another embodiment, the present invention provides a method for balancing the interference distribution between radio cells in a wireless communication system, comprising a plurality of radio cells in which a plurality of subcarrier block is used. for communication, wherein each subcarrier block comprises a plurality of subcarriers. In addition, N adjacent radio cells can build a cell group, where N is an integer of 2 or more. According to this embodiment of the present invention, the subcarrier blocks can be grouped into N groups of subcarrier blocks in each radio cell of the cell group, wherein the radio cells of the cell group can comprise groups of corresponding subcarrier blocks. that have the same subcarriers. From that, the number of subcarrier group groups corresponds to the number of radio cells in a group in this mode. In addition, N transmission power scales may be determined for each of the radio cells in the group of cells, wherein a transmission power scale defines a scale of transmission power levels used for transmission power control, and The N transmission power scales can be assigned to the N groups of subcarrier block of radio cells of the cell group, so that each of the N transmission power scales in a radio cell is assigned to one of N block groups subcarrier of the radio cell, and each of N transmission power scales is assigned to a subcarrier block groups of the corresponding subcarrier block groups. When the number of cells in a cell group is chosen, the number of subcarrier block groups and the number of transmission power scales as proposed in this embodiment the general distribution rule as defined above can be significantly simplified. Another embodiment of the present invention relates to a system in which a number of transmission energy scales and subcarrier block groups are each multiple integers of the number of radio cells in a group of cells. This mode also provides a method for balancing the distribution of interference between radio cells in a wireless communication system. Again, the system may comprise a plurality of radio cells in which a plurality of subcarrier block is used for communication, wherein each subcarrier block may comprise a plurality of subcarriers. N adjacent radio cells can build a cell group, where N can be an integer of 2 or more. According to the method, the subcarrier blocks can be grouped in s.f. groups of subcarrier blocks in each radio of the group of cells, wherein the radio cells of the group of cells each comprise subcarrier block groups having the same subcarriers. x represents an integer of 1 or more. In addition, Inc. transmission power scales can be determined for each of the radio cells in the group of cells, wherein a transmission power scale defines a scale of transmission power levels used for transmission power control, and where and is a whole number of 1 or more Then, the transmission power scales of Inc. can be assigned to the subcarrier block groups x | N of the radio cells of the cell group, so that each of Inc. transmission power scales in a radio cell is assign one of x | N groups of subcarrier block of the radio cell, and / x transmit power scales on average are assigned to a subcarrier group of corresponding subcarrier block groups. It was noted that the ratio y / x can also result in a non-integer number depending on the choice of parameters x and y.

Obviously, it is not possible to assign half of a transmission energy scale to a subcarrier group of blocks. However, it is possible to distribute a whole number of energy scales to groups of subcarrier blocks in which different amounts of energy scales are assigned to each of the groups of subcarrier blocks to be assigned above the average of the proportion of scales of energy y / x. It was further noted that different modalities of the method for balancing the interference in a wireless communication system outlined above should not be understood as restricting the energy scales in different cells of a cell group for identical energy scales. The individual energy scales in each radio cell of a group of cells may be identical or may be different from one another. This is advantageous for being able to adapt to, for example, the respective channel conditions and / or cell means in different cells. In all the above embodiments, the method may further comprise the steps of measuring the path loss of a communication signal of a communication terminal and the path loss of the interference of adjacent cells. The above embodiments may further comprise assigning the communication terminal to at least one subcarrier block of one of the subcarrier block groups based on the measurement. A transmission energy scale for the communication terminal can be determined based on the aforementioned measurement, and the communication terminal can be assigned to at least one subcarrier group of blocks based on the determined transmission energy scale. It should be noted that the actual channel assignment can be carried out in a subcarrier block. In this context, the assignment to a group of subcarrier blocks can be considered as a preselection. In an alternative embodiment, it may also be considered to allocate a block group for a communication terminal first and choose the respective transmission power level based on the assignment. From there, the transmission energy scale can be determined based on the assigned block group. The transmission energy scale of the assigned subcarrier block group can be chosen based on the proportion of the loss of measured signal path and the loss of measured path trajectory. Accordingly, for a communication terminal that is located near a base station of a radio cell the measurement results may indicate that a transmission power scale comprising low transmit power levels may be sufficient for a communication between the communication terminal and the base station. In contrast, for a communication terminal that is located near the cell boundaries of a radio cell the measurement results can indicate a compliance transmission power scale that comprises large transmission power levels that may be required for a communication between the communication terminal and the base station.

In addition, it should be noted that channel quality fluctuations can be opposed by changing the level of transmission energy within allowed energy for the respective subcarrier block groups, by changing the transmission energy scale (ie changing the subcarrier block groups), or by performing link adaptation by changing the modulation and coding scheme. It is also advantageous if the transmission energy scales in different radio cells of a cell group vary, so that it can be adapted to the respective channel conditions in each of the radio cells of the cell group. In addition, the transmission power scales in a radio cell may vary between the radio cells. As explained above, this allows individual control of the transmission power scales in each of the cells to adapt the same to change the channel quality conditions in the respective cell. In order to be able to adapt the channel quality conditions, the subcarrier block groups can also be reconfigured in a radio cell. For the same reason as previously, the transmission power scales can also be reconfigured in a radio cell. The reconfiguration of the energy scales and / or subcarrier block groups in the radio cell can be done according to the other radio cells in their group of cells. The reconfiguration may be based on channel quality measurements in the radio cell and / or the other radio cells of its cell group. In addition, the information related to a reconfiguration of the subcarrier block groups in a radio cell can be signaled from the radio cells to the other radio cells in their cell group or can be signaled from a control unit (e.g. , radio network controller) to the radio cells that form a group of cells. According to another embodiment of the present invention also the information related to the channel qualities in a radio cell can be signaled from the radio cell to other radio cells of its group of cells. By signaling the channel qualities in a radio cell for the adjacent radio cells, they can include the information when the transmission power scales or subcarrier block groups in the respective radio cell are reconfigured. The main idea preceding the present invention may also be applicable to systems in which the radio cells are divided into sectors, that is, systems using multiple-beam antennas or multiple antennas. By employing this arrangement, a single cell can be divided into a plurality of sectors each covered by an antenna beam. According to another embodiment, the present invention therefore provides a method for balancing the interference distribution between radio cells in a wireless communication system. The system may comprise a plurality of radio cells each comprising at least two sectors, wherein in each sector a plurality of subcarrier block is used for communication. Each subcarrier block may comprise a plurality of subcarriers, and a number of adjacent radio cells that build a cell group. The subcarrier blocks can be grouped into a plurality of subcarrier block groups in each of the sectors of each radio cell in the group. A plurality of transmission power scales can be determined for each sector of each cell group radio cell, wherein a transmission energy scale defines a scale of transmission energy levels used for transmission power control. Then, the plurality of transmission energy scales can be assigned to the plurality of groups of subcarrier blocks of a sector of a radio cell and their adjacent sectors of the other radio cells. In another embodiment, each sector of a radio cell may have adjacent sectors in the other radio cells of the group of cells. In addition, a sector of a radio cell and its adjacent sectors belonging to the other radio cells can build a sector group and each can comprise groups of corresponding subcarrier blocks having the same subcarriers. The plurality of transmission power scales can be assigned to the radio cell subcarrier block groups of the cell group so that a single sector of a radio cell, there is a location of each of the plurality of transmission power scales for a group of subcarrier blocks of the sector, and there is a location of each of the plurality of transmission power scales for one of the corresponding subcarrier block groups in the sector group. Alternatively, the plurality of transmission power scales can be assigned to the radio cell subcarrier block groups of the cell group, so that a single sector of a radio cell, there is a location of each of the plurality of groups of the subcarrier block of the sector for a transmission energy scale and there is a location of each of the plurality of corresponding subcarrier block groups in the sector group for a transmission energy scale. As outlined above, the location can be a single location or one by one. To simplify the distribution of transmission energy scales and subcarrier block groups, their number can be determined in relation to the number of radio cells that make up a group of cells. Thereafter, in another embodiment, the present invention provides a method for balancing the interference distribution between radio cells in a wireless communication system. The system may comprise a plurality of radio cells each comprising at least two sectors, wherein in each sector a plurality of subcarrier blocks is used for communication wherein each subcarrier block comprises a plurality of subcarriers. A number of adjacent radio cells can build a cell group. The subcarrier blocks can be grouped into N groups of subcarrier blocks in each of the sectors of each radio cell in the group, where each sector of a radio cell has N-1 adjacent sectors in the other radio cells of the group of cell, and wherein a sector of a radio cell and its adjacent sectors in other radio cells each comprises a corresponding subcarrier group of blocks having the same subcarriers and wherein N may be an integer of two or more. In addition, N transmission power scales can be determined for each sector of each radio cell of the group of cells, wherein a transmission energy scale defines a scale of transmission energy levels used for transmission power control. The N transmission power scales can be assigned to the N groups of subcarrier block of a sector of a radio cell and its adjacent sectors of the other radio cells, so that one sector, each of the N of energy scales Transmission energy in a sector of a radio cell is assigned to one of the N subcarrier block groups in the sector, and each of the N transmission power scales is assigned to a group of corresponding subcarrier block sectors. Another embodiment of the present invention relates to a system in which the number of transmission power scales and subcarrier block groups are each multiple of integers of the number of radio cells in a group of cells. This mode also provides a method for balancing the interference distribution between radio cells in a wireless communication system. Again, the system may comprise a plurality of radio cells each comprising at least two sectors, wherein in each sector a plurality of subcarrier block is used for communication, wherein in each sector a plurality of block is used. subcarrier for communication, wherein each subcarrier block comprises a plurality of subcarriers. A number of adjacent radio cells can build a group of cells. In this mode, the subcarrier blocks can be grouped in s.f. subcarrier block groups in each of the sectors of each group radio cell, wherein each sector of a radio cell has N-1 adjacent sectors in other radio cells of the cell group, and wherein a sector of a radio cell and its adjacent sectors in the other radio cells may comprise groups of corresponding subcarrier blocks that have the same subcarriers. x can be an integer of 1 or more and N can be an integer of two or more. In addition, Ion transmission power scales can be determined for each sector of each cell cell radio cell, where y can be an integer of 1 or more. The transmission energy scales and | N can be assigned to the s.f. groups of subcarrier block of a sector of a radio cell and its adjacent sectors of the other radio cells, so that in a sector, each of the transmission power scales in a sector of a radio cell are assigned to one of the x | N groups of the subcarrier block of the sector, and y / x transmission energy scales on the average are assigned to a group of subcarrier blocks of corresponding sectors. The communication system further comprises a plurality of communication terminals which communicate with base stations associated with the plurality of radio cells. The path loss of a communication signal of a communication terminal and the path loss due to adjacent sector interference for the communication signal can be measured, for example, in a base station, and the communication terminal is You can assign a subcarrier block of a subcarrier group of blocks in a sector based on the measurement. In another step a transmission power scale can be determined for the communication terminal based on the measurement, and the communication terminal can be assigned to a block group based on the determined transmission power scale. According to another embodiment, it may also be considered to assign a block group to a communication terminal first and choose the respective transmission power level based on the assignment. From there, the transmission power scale can be determined based on the assigned block group.

Transmission energy scales in different sectors may vary as well as the transmission energy scales of sectors of a radio cell. Regardless of the use of single or multiple beam antennas, the size of the groups of subcarrier blocks in groups of corresponding subcarrier blocks may be equal, that is, each of the subcarrier block groups comprises the same number of subcarrier and / or subcarrier blocks. . In addition, subcarrier block groups can be reconfigured in a radio cell sector. The same applies to the scales of transmission energy also of a sector. The reconfiguration of energy scales and / or subcarrier block groups in the sector can be done in accordance with the other sectors of your sector group. In addition, the reconfiguration can be based on channel quality editions in the sector and / or the other sectors of its sector group. In the context of reconfiguration, the information related to a reconfiguration of the subcarrier block groups in a sector can be signaled from its radio cell to radio cells comprising sectors of the sector group. Also, the information related to channel qualities in a sector can be indicated from its radio cell to radio cells comprising sectors of the sector group.

Regardless of the system architecture, that is, the use of radio cells divided into sectors or not, the information related to the reconfiguration of energy levels or subcarrier block groups can be signaled for a control unit in the communication system . Taking the example of the release architecture 99/4/5 UTRAN (UMTS Terrestrial Radio Access Network), such a control unit can be a radio network controller (RNC) or, in the developed architecture an improved Node B functional, the Node B +. In addition, also independent of the system architecture, information related to a subcarrier block assignment and / or a subcarrier block group assignment can be signaled to a communication terminal. The communication terminal may further comprise receiving means for receiving information indicating a subcarrier block assignment and / or an allocation of groups of subcarrier blocks, and selection means for selecting the designated assigned subcarrier block and / or groups of assigned subcarrier blocks. designated for data transmission. All the different modalities of the inventive method for balancing the sub-channel interference in radio cells can advantageously be used in a base station. The base station may be equipped with respective means to perform the different steps of the method according to the different modalities of the method as outlined above.

In addition, the present invention provides a communication terminal adapted for operation in the communication systems described above. In the communication terminal, an energy control means may be adapted to perform power control on a transmission power control scale in a range defined by the zero transmission power level and a maximum transmit power level. The present invention also provides a radio communication system comprising a base station adapted to carry out the method according to the different modes and at least one communication terminal and the communication terminal described above.

BRIEF DESCRIPTION OF THE DRAWINGS In the following, the present invention is described in more detail with reference to the accompanying drawings and drawings. Similar or corresponding details in the Figures are marked with the same reference numbers. Figure 1a shows a transmission energy distribution for subcarrier block according to the prior art, Figures 1b-1d show 3 examples for a transmission energy distribution for subcarrier block according to an embodiment of the present invention., Figures 2a-2f show a transmission energy distribution for subcarrier block in adjacent cells in a frame-by-frame basis according to the prior art, Figures 3a-3f show a transmission energy distribution for subcarrier block in cells adjacent on a frame by frame basis according to an embodiment of the present invention, Figure 4 shows an example for an energy scale distribution of subcarrier block groups for subcarrier block in adjacent cells according to an embodiment of the present invention , Figures 5a-5i show three examples for configuration of groups of multi-cell energy scale subcarrier blocks with subcarrier block groups. Equally adjusted according to one embodiment of the present invention, Figure 6 shows an example for a standard. of energy scale distribution of groups of subcarrier blocks in adjacent radio cells entities each divided into a plurality of sectors according to one embodiment of the present invention, and Figure 7 shows another example for an energy scale distribution pattern of groups of subcarrier blocks in adjacent radius cells each divided into one. plurality of sectors according to one embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION In the following the present invention will be described with respect to wireless communication system using OFDM. Through the examples that refer to OFDM, it should be noted that the ideas in accordance with the present invention will be easily applied also to other communication systems based on FDM. According to one embodiment of the present invention, the OFDM subcarrier blocks can be divided into N subcarrier block groups (SBS). Figure 1a shows the transmission energy distribution of subcarrier blocks according to a prior art system. Figures 1b-1d show three examples for the distribution of energy limits (or scales) with different SBS definitions according to different embodiments of the present invention. The assignment of the energy limits can be done according to the energy limits of SBS in adjacent cells in order to control the SIR levels depending on the SBS as for example of sample in Figures 5a-5i. Compared to the prior art, this definition of energy limit has the advantage that inter-cell-interference variations on a subcarrier block basis are reduced, since the interference from a given adjacent cell can not exceed a specific upper limit due to the upper transmission power limit of SBS. In the prior art, the transmission energy per subcarrier block can have any value between zero and a defined maximum with the obligation that the total transmission energy should not exceed the maximum allowed transmission energy. Figure 1a shows such a subcarrier-block energy distribution for a controlled energy system. According to one embodiment of the present invention the subcarrier blocks can be divided into subcarrier block (SBS) groups, wherein an upper limit (and possibly a lower limit) for the subcarrier block transmission energy can be defined. Figures 1b-1d show three examples of SBS definitions, where in the leftmost example an SBS is constructed from adjacent subcarrier blocks. Alternatively, a predetermined number of consecutive subcarrier block can be grouped into a subcarrier group of blocks, which is assigned to a transmission power limit. The example shown in the middle associates subcarrier blocks spaced by a fixed interval to a subcarrier group of blocks, while in the rightmost example in Figures 1 b-1d a free distribution of subcarrier block in groups of subcarrier block is shown. Furthermore, it should be noted that the different subcarrier block groups of a radio cell do not necessarily comprise an equal number of subcarrier blocks as shown in the three examples.

The definition of different transmission power scales or limits can provide the possibility of locating mobile stations in low geometry to subcarrier block belonging to an SBS with a transmission power control scale that has large power levels, to locate stations mobile in medium geometry to subcarrier blocks belonging to an SBS with a transmission power control scale having average energy levels and to locate mobile stations in upper geometry for subcarrier block containing an SBS with a power control scale of transmission that has low energy levels. Again it is noted, that only three illustrative transmission energy scales are used in this modality. With respect to DCA and PC, different methodologies for subcarrier assignment may be possible. PC for a given MS can be considered first and then a subcarrier block of an SBS for which the limits are not exceeded by the subcarrier block transmission power that can be assigned. Alternatively, a subcarrier block can be assigned to the MS and then the transmission power according to the allowed limits is assigned (ie, the PC performs within the given limits). One of the benefits of the present invention is that the Interphase structure created for a given subcarrier block is limited to the top by the maximum transmission power allowed by the subcarrier block by the SBS power limit definition. In this way the variation of SIR can be reduced and a worst case of SIR can be estimated in adjacent cells. Since in the prior art any transmission energy (within the total energy limits) is allowed for any subcarrier, the inter-cell interference created varies on a large scale. The variation of SIR (from frame to frame) may even be smaller, if so, a lower energy limit is defined for the subcarrier blocks. Figures 2a-2f and Figures 3a-3f show an example of subcarrier block transmission power assignments of the radio cells adjacent to cell 1 (BSi) (see Figure 4) for a prior art system and for a system according to an embodiment of the present invention. Assuming that, an MS is located, for example, inside radio cell 1 near the cell of radio cell 2 and radio cell 3 (MS position to the upper right of cell 1), the radio cell 2 and radio cell 3 causes the main interference. Figures 2a-2f indicate the transmission energy per subcarrier block in a prior art system. As will be apparent from them, the inter-cell interference can vary significantly from frame to frame, since the interference caused by radio cell 2 and radio cell 3 on a given subcarrier may vary depending on the transmitted energy , which can be between zero and maximum transmission energy. Since the frame-by-frame fluctuations in the interference may not be known in the radio cell 1, in SIR per subcarrier block it can change within this large scale. From that, the selection performance of DCA and AMC can be significantly reduced due to their "unknown" variation in the SIR per subcarrier block. In considering the method proposed by the present invention, the Figures 3a-3f show that the transmission energy per subcarrier blocks can only fluctuate within specific limits, ie within a predefined range of transmission power control levels when energy control is performed for a subcarrier block. This may allow to improve the estimation / prediction accuracy of SIR that may result in increased selection performance of DCA and AMC. Furthermore the definition of energy scales can be realized so that, for example, a mobile station in low geometry (ie, near the cell boundary) can be assigned to one or multiple subcarrier block (s) that belongs ( n) to a subcarrier group of blocks that has a power scale of high transmission energy levels. The opposite would apply for mobile stations in high geometry. In addition to the subcarrier block division into subcarrier block groups, the energy limit definitions in adjacent radio cells can be aligned. Taking as an example the division of subcarrier block into groups of subcarrier block as shown in Figure 4, that is, three groups of subcarrier block per radio cell, the scales of transmission energy in which energy control is performed it can be defined according to the lower table.

Considering the radio cells from 1 to 3 as a group of cells of interference cells (see Figures 5a-5i) the energy limits can be coordinated so that they cross the considered radio cells of the group for each group of subcarrier blocks, a high, a medium and a low energy limit is defined once. With respect to inter-cell interference this can have the following effects: a subcarrier block belonging to an SBS with a high energy limit is interfered with by subcarrier blocks with medium and low energy limit, a subcarrier block belonging to a SBS with a medium energy limit is interfered by subcarrier blocks with high and low energy limit, and a subcarrier block belonging to an SBS with a low energy limit is interfered by subcarrier block with high and medium energy limit.

Although the examples shown in Figures 3a-3f and also the distribution rule as defined in the above table refers to three groups of subcarrier block per radio cell and three transmission power scales, the present invention is generally applicable to any number of transmission power scales and groups of subcarrier blocks in a radio cell. As will be obvious from the examples given above, a certain constellation in the choice of the number of transmission power scales and the number of groups of subcarrier blocks can provide a rule of simple assignment of transmission power levels to groups of subcarrier blocks (or vice versa). The following matrix shows an example for the generalization of the "allocation rule" mentioned above, where PRnx refers to a range of transmission energy in cell of radius n that has a scale index of transmission energy x, which identifies The X of different transmission energy scales available per radio cell: In the previous table, the PRpx energy scale of an energy scale index x can vary between different radio cells or can represent the same energy scale. It is important to note that in the given example the index x = 1 refers to the energy scale PRpx, in cell of radius N that has the lowest transmission energy levels available for energy control, while x = X refer to the energy scale PRnx in the radio cell n that has the largest transmission energy levels available for energy control. In addition, PRnx < PRnx-? is valid for all x. The distribution of the energy scales between different cells can be achieved by a permutation of the index x that indicates the resistance of the energy levels, that is, the scale of energy level of transmission of a signal emitted by a cell base station of radio n. As can also be seen in the table, each of the energy scale indexes x e. { 1,2,3, ..., X.}. occurs once in each column and each row of the matrix. From there, in the example shown, the number of groups of subcarrier blocks M equal to the transmission energy scale numbers X. Also the number of radio cells in a group M is the same as the number of radio groups. M subcarrier blocks or X transmission power scales respectively. It should be noted that a possible mode allows PRpx = PRpx- ?, which essentially means that in the respective cell SBSm and SBSm + 1 can have an identical transmission power scale. Naturally, these can only be valid for groups of selected subcarrier blocks. This modality can be considered similar to the case when it has lower energy scales than the groups of subcarrier blocks for a given cell and an individual energy scale is used for multiple groups of subcarrier blocks. In the case M > X, more than one group of subcarrier blocks can be assigned to a single transmission power scale. Also in the case N? M, that is, the number of radio cells in a group and the number of groups of subcarrier blocks is not the same, a rule of distribution can follow the rule as mentioned above, that is, each row and column in the matrix can only understand each of the energy scale indexes x once. When the number of transmission energy scales and groups of subcarrier blocks is chosen equal to a multiple of the number of cells in a group of cells, a simple distribution rule can be defined. In case the number of subcarrier group groups of the transmission cell scales per radio cell are also equal, the location scheme as outlined above can be used. Figure 4 further shows that the subcarrier block group alignment according to this embodiment can be extended to a multiple cell scenario when the denoted interference properties are maintained. The multiple cell alignment of proposed subcarrier block group can have the following effects / benefits. The SIR for MS in low geometries can reduce, since they are preferably assigned to subcarrier blocks belonging to groups of subcarrier blocks with high transmission energy, ie they have an associated transmission energy scale comprising large transmission energies, which experience less interference, for example, through of blocks 5 medium and low energy subcarrier. The SIR for MS in high geometries can be increased, since they are preferably assigned to a subcarrier block belonging to SBS with low transmit power, which experiences increased interference, for example, through high and medium low subcarrier blocks. By employing the principles of the present invention as outlined, the dynamic scale required for the control of transmission energy can be decreased. According to another embodiment of the present invention, the lower energy limits (pMIN) are equal to the upper limits (PMAX) of the group of subcarrier blocks "after stronger", that is, for ? c DMAX. DMAX, pMAX, antnn.a. p IN _ DMAX '5 r SBS 1 = ^ SBS 2 = G SBS 3 = - - • ßntOnCßS SBS 1 - "SBS 2? r SBS 2 - 'SBS 3 - - - a.S.O. According to another embodiment of the present invention, the lower energy limits (F ^ m) are smaller (for example, by a defined equivalent) than the upper limits (PMAX) of the next group of 0 subcarrier blocks, ie , for PMAXSBS 1 > P ^ SBS 2 = PMAXSBS 3 = - a.s.o. then PM, NSBS 1 < P AXSBS 2, P INSBS 2 < P AXSBS 3 ... a.s.o. According to another embodiment, an MS in low geometry can be assigned to high energy subcarrier block groups and vice versa, i.e., a communication terminal is assigned to a radio channel (one or multiple subcarrier block (s) of a group of subcarrier blocks) based on their geometry. It should be noted that in a real deployment and environment the term geometry does not necessarily solely depend on the distance of MS-BS (distance from MS to the center of the cell), but refers more to the loss of signal path. That is, an MS can be very close to the BS, but it can have a low average SIR, since the signal path is overshadowed by a construction and the interference path (s) is (are) LOS (line of sight). A subcarrier block as used in the previous sections can comprise M subcarriers, where M can also be 1. That is, in the case of M = 1 the system would be "reduced" to an FDM system. A subcarrier block group (SBS) may contain S subcarrier blocks, where S may vary depending on the defined SBS, however preferably the same subcarrier blocks for respective SBSs should be used in adjacent cells. A group of subcarrier blocks (SBS) can contain S subcarrier blocks, where S can vary depending on the SBS defined. However, according to another embodiment of the present invention, the same subcarrier blocks for respective SBSs can be used in adjacent cells. In the latter case, for each of the groups of subcarrier blocks in each radio cell of the cell group there may exist a corresponding subcarrier block group in an adjacent radio cell corresponding to the same subcarrier that are assigned to the groups of corresponding subcarrier blocks. In addition, the SBS energy limits may vary depending on the radio cell. For defined x SBSs, up to x-1 SBSs may have the same power limit. The energy limits can be reconfigured for each cell individually or according to adjacent radio cells. Another aspect of the present invention relates to signaling related to the (re) configuration of subcarrier block groups in radio cells and the transmission or limit energy scales. Since a reconfiguration in a radio cell can be coordinated with radio cells adjacent to the cells, it may be necessary to signal information related to the reconfiguration to the adjacent cells. For exemplary information that relates to the channel quality, that is, levels of interference in a radio cell, the neighboring radio cells can be pointed out in order to allow them to use this information when a reconfiguration of their levels is considered. of energy used. Also when the grouping of subcarrier blocks in the groups of subcarrier blocks has to be changed, the new distribution or location of subcarrier blocks for the groups of subcarrier blocks can be pointed to the adjacent cells, while those can use the same location in respective paths.

Depending on the network architecture this information may be transmitted to a monitoring unit (eg, radio network controller) which controls a cell group and may use respective information in order to initiate a (re) configuration. According to another embodiment of the present inventionAnother aspect of the invention is the signaling related to the communication between the transmitter and the receiver. The signaling between the transmitter and the receiver may comprise the signaling of a subcarrier block group assignment and a subcarrier block assignment. Prior to a real frequent allocation (frame by frame) of the subcarrier block, there may be a relatively less frequent pre-allocation of a mobile station to a group of subcarrier blocks, which can basically define a group of subcarrier (active) blocks for the respective mobile station . This can make it possible to reduce the upper signaling of the subcarrier block assignment, since the signaling must only be carried out with respect to the group of subcarrier blocks for which the mobile station is pre-assigned. In addition, it may allow to reduce the upper signaling for the channel quality feedback signaling for the receiver to the transmitter, which may be carried out only for the respective subcarrier block group. In addition, it was noted that the designs in accordance with the present invention can be applied to any cell arrangement. According to another embodiment of the present invention, the radius cell divided into sectors can be used. An example of a hexagonal radio cell layout with 3 sectors per cell is shown in Figure 6 and 7. It can be assumed that the antenna patterns of the sectors within a radio cell interfere with one another in a careless way (that is, antenna beam width <120 ° C). In this case the interference of sectors of adjacent cells (within the antenna beam width) can be dominant. As shown in Figure 6, for sector 2 of radio cell 1 (BS-i) there are two adjacent sectors in adjacent radio cells, mainly in sector 2 in radio cell 3 (BS3) and sector 3 in radio cell 2 (BS2). These three adjacent sectors in the different radio cells can also be considered as a sector group. In each of the sectors shown in the individual radio cell, the same subcarrier blocks (i.e., subcarriers) can be used simultaneously. In order to balance the interference, the methods can be used as previously proposed for the use of individual radio antennas. The method was only adopted for the new cell arrangement and that instead of performing the interface balance in radio cells of a cell group, interference between sectors or a sector group is balanced. When comparing Figure 6 with Figure 4, it is noted that the same choice of the number of transmission energy scales and subcarrier block groups and a similar location between energy scales and groups of subcarrier blocks can be employed. As illustrated in Figure 6, the same group combinations of energy scale subcarrier blocks can be used within sectors of a radio cell. Thereafter, the "pattern" of combinations of the group of energy scale subcarrier blocks coordinated between sectors belonging to a sector group may correspond to the same known one of Figure 4 for combinations of the energy scale subcarrier block group coordinated for a radio cell group. However, in the case of using radio cells divided into sectors, the energy scales chosen in the sectors of an individual radio cell may differ from one another. In addition, the transmission power scales and subcarrier block groups within a sector can be reconfigured as described above. The signaling that may be necessary to inform the adjacent radio cells in the reconfiguration of a sector can be transmitted to the base stations that provide the antenna beam of adjacent sectors of a sector group. Depending on the network architecture this can be done directly or through the control unit in the communication system, for example a Radio Radio Controller (RNC). Another example for a combination of the possible energy scale subcarrier block group is illustrated in Figure 7. In this embodiment of the present invention, the sectors of a single radio cell do not use the same combination of scale subcarrier block group of energy, which in the example of Figure 6. The "pattern" resulting from the group combinations of coordinated energy scale subcarrier block considered in a sector basis is similar to that shown in Figure 4. This means that a sector in Figure 7 corresponds to the radio cell in Figure 4 to abstain in the fact that more than one sector is controlled by a base station of a radio cell. The proposed method can also be applied to systems of MC-CDMA. Here, the transmission power limits for an SBS must be defined for the sum of the energy per code for a given (sub) potador- (block). Such a MC-CDMA system can be employed extended in the time and / or frequency domain. Furthermore, it is noted that the principles in accordance with the present invention may be applicable for communication in the downlink and / or uplink of a communication system.

Claims

NOVELTY OF THE INVENTION CLAIMS

1. - A method for balancing the interference distribution between radio cells in a wireless communication system, the system comprising a plurality of radio cells in which a plurality of subcarrier blocks is used for communication, wherein each subcarrier block comprises one plurality of subcarriers, wherein a group of adjacent radio cells build a cell group, the method comprising the steps of: grouping said subcarrier blocks into a plurality of groups of subcarrier blocks in each radio cell of the cell group, determining a plurality of transmission power scales for each of the radio cell of said cell group, wherein a transmission energy scale defines a scale of transmission energy levels used to control transmission power, assigning the plurality of Transmission energy scales to the groups of subcarrier block of radio cells of the group of cells

2. The method according to claim 1, further characterized in that the radio cells of the cell group each comprise corresponding subcarrier block groups having the same subcarrier.

3. - The method according to claim 2, further characterized in that said plurality of transmission power scales is assigned to the radio cell subcarrier block groups of the group of cells, so that in a single radio cell, there is a location of each of said plurality of transmission energy scales for a subcarrier block of said individual radio cell, and there is a location of each of said plurality of transmission energy scales for one of said corresponding subcarrier block groups in the radio cell of said cell group.

4. The method according to claim 2 or 3, further characterized in that said plurality of transmission power scales is assigned to the groups of subcarrier blocks of radio cells of the cell group, so that in a single radio cell , there is a location of each of said plurality of subcarrier block groups of said individual radio cell for a transmission power scale, and there is a location of each of said corresponding subcarrier block groups in the radio cells of said cell group to one of said plurality of transmission power scales.

5. The method according to claim 3 or 4, further characterized in that the location is a single location or one by one.

6. A method for balancing the distribution of interferences between radio cells in a wireless communication system, the system comprising a plurality of radio cells in which a plurality of subcarrier blocks are used for communication, wherein each block subcarrier comprises a plurality of subcarriers, wherein N adjacent radio cells construct a group of cells, N being an integer of 2 or more, the method comprising the steps of: grouping said subcarrier blocks N groups of subcarrier blocks in each cell radio of the cell group, wherein the radio cells of the cell group each comprise groups of corresponding subcarrier blocks having the same subcarrier, determine N transmission power scales for each of the radio cells of said group of cells, where a transmission energy scale defines a scale of transmission energy levels used for control Transmission energy, assign N transmission power scales for the N groups of subcarrier block of radio cells of the cell group, so that each of the N transmission power scales in a radio cell is assigned to one of the N subcarrier group groups of said radio cell, and each of the N transmission power scales is assigned to a subcarrier group group of corresponding subcarrier block groups.

7.- A method to balance the distribution of interference between radio cells in a wireless communication system, the system comprising a plurality of radio cells in which a plurality of subcarrier blocks is used for communication, wherein each subcarrier block comprises a plurality of subcarriers, wherein N adjacent radio cells construct a group of cells, N being an integer number of 2 or more, the method comprising the steps of: grouping said subcarrier blocks into x | N subcarrier group groups in each radio cell of the cell group, wherein the radio cells of the group of cells each one comprises corresponding subcarrier block groups having the same subcarriers, x being an integer of 1 or more, determining and | N transmission power scales of each of the radio cell of said cell group, wherein a scale Transmission energy defines a scale of energy transmission levels used for transmission energy control, and being an integer of 1 or more, assigning scales of transmission power for x | N groups of subcarrier blocks of radio cells of the cell group, so that each of y | N transmission power scales in a radio cell is assigned to one of x | N groups of subcarrier blocks of said radio cell, and y / x transmit power scales over the average are assigned to a group of subcarrier blocks of corresponding subcarrier block groups.

8. A method for balancing the interference distribution between the radio cells in a wireless communication system, the system comprising a plurality of radio cells each comprising at least two sectors, wherein in each sector one plurality of subcarrier blocks is used for communication, wherein each subcarrier block comprises a plurality of subcarriers, wherein a number of adjacent radio cells construct a cell group, the method comprising the steps: grouping said subcarrier blocks into a plurality of groups of subcarrier blocks in each of the sectors of each radio cell of said group, determining a plurality of transmission energy scales for sector of each radio cell of the cell group, wherein a scale of transmission energy defines a scale of transmission power levels used for transmission power control, assign the plurality of transmission scales transmission system to the plurality of subcarrier block groups of a sector of a radio cell and adjacent sectors of said other radio cells.

9. The method according to claim 8, further characterized in that each sector of a radio cell has adjacent sectors in the other radio cells of the cell group, and wherein a sector of a radio cell and its adjacent sectors in said other radio cells they construct a sector group and each comprises a group of corresponding subcarrier blocks having the same subcarrier.

10. The method according to claim 9, further characterized in that said plurality of transmission power scales are assigned with subcarrier block groups of cell group radio cells, so that a single sector of a cell of radius, there is a location of each of said plurality of transmission power scales for a group of subcarrier blocks of said sector, and there is a location of each said plurality of transmission power scales for one of said block groups corresponding subcarrier in said sector group.

11. The method according to claim 9 or 10, further characterized in that said plurality of transmission power scales is assigned to the radio cell subcarrier block groups of the cell group, so that in a single sector of a radio cell, there is a location of each of said plurality of groups of subcarrier blocks of said sector for a transmission energy scale, and there is a location of each of said plurality of said corresponding subcarrier block groups in said sector group for a transmission energy scale.

12. The method according to claim 10 or 11, further characterized in that the location is a single or one-to-one location.

13. A method for balancing the distribution of interference between radio cells in a wireless communication system, the system comprising a plurality of cells each comprising at least two sectors, wherein in each sector a plurality of blocks of subcarrier is used for communication, wherein each subcarrier block comprises a plurality of subcarriers, wherein a number of adjacent radio cells construct a group of cells, the method comprising the steps of: grouping said subcarrier blocks into blocks N subcarrier in each of the sectors of each radio cell of said group, wherein each sector of a radio cell has N-1 adjacent sectors in the other radio cells of the cell group, and wherein a sector of a radio cell and its adjacent sectors in said other radio cells each comprise corresponding subcarrier block group having the same subcarrier, N being a number of • two or more, determine N transmission power scales for each sector of each radio cell of the cell group, where a transmission energy scale defines a scale of transmission power levels used for transmission power control assign the N transmission power scales to the N groups of subcarrier block of a sector of a radio cell and its adjacent sectors of said other radio cells, so that in one sector, each of the N transmission power scales in a sector of a radio cell is assigned with one of the N groups of subcarrier blocks of said sector, and each of the N transmission power scales is assigned with a group of corresponding subcarrier block sectors.

14. A method for balancing a method for balancing the interference distribution between radio cells in a wireless communication system, the system comprising a plurality of radio cells each comprising at least two sectors, wherein Each sector a plurality of subcarrier blocks is used for communication, wherein each subcarrier block comprises a plurality of subcarriers, and wherein a number of adjacent radio cells construct a group of cells, the method comprising the steps of: grouping said blocks of subcarrier in x | N groups of subcarrier block in each of the sectors of each radio cell of said group, where sector of a radio cell has N-1 adjacent sectors in the other radio cells of the cell group, and wherein a sector of a radio cell and its adjacent sectors in said other radio cells each comprises a corresponding subcarrier group of blocks having the same subcarriers, x being an integer number of 1 or more and N being an integer of 1 or more, and N being an integer of 2 or more, determining and | N transmission power scales for each sector of each cell radio of the cell group, wherein a transmission energy scale defines a range of transmission energy levels used for transmission power control, and being an integer of 1 or more, assigning the y | N energy scales transmission to the x | N groups of subcarrier block of a sector of a radio cell and its adjacent sectors said other radio cells, so that in a sector, each of y | N transmission power scales in a sector of a radio cell is assigned with the x | N groups of subcarrier block of said sector, and y / x transmission energy scales on the average are assigned to a group of corresponding subcarrier block sectors.

15. The method according to one of claims 1 to 14, further characterized in that the communication system comprises a plurality of communication terminals communicating with base stations associated with said plurality of radio cells / sectors, the method further comprising the steps of: measuring the path loss of a signal of communication of a communication terminal and loss of interference path of adjacent radio cells / sectors of said communication signal, and assigning the communication terminal to a subcarrier block of a group of subcarrier blocks in a cell / radio based sector in that measurement.

16. The method according to claim 15, further characterized in that it further comprises the step of determining a transmission energy scale for said communication terminal based on said measurement, and wherein the communication termination is assigned to a group of block based on the determined transmission energy scale.

17. The method according to one of claims 1 to 16, further characterized in that the transmission energy scales in different cells / radio sectors vary.

The method according to one of claims 1 to 17, further characterized in that the group size of the subcarrier block of corresponding subcarrier block groups is the same.

19. The method according to one of the claims

1 to 18, further characterized in that it further comprises the step of reconfiguring the groups of subcarrier blocks in a cell / radio sector of radio cell.

20. - The method according to one of claims 1 to 19, further characterized in that it further comprises the step of reconfiguring the transmission energy scales in a cell / radio sector of a radio cell.

21. The method according to claim 19 or 20, further characterized in that the reconfiguration of the energy scales and / or subcarrier block groups in the radio cell is carried out in accordance with the other radio cells of its group of cell.

22. The method according to claim 19 or 20, further characterized in that the reconfiguration of the energy scales and / or groups of subcarrier blocks in the sector are carried out in accordance with the other sectors of its sector group.

23. The method according to one of claims 19 to 22, further characterized in that the reconfiguration is based on channel quality measurements. 24.- The method according to one of the claims

1 to 23, further characterized in that it further comprises the step of signaling information related to a reconfiguration of the subcarrier block groups in a cell / radio sector of the radio cell for at least one adjacent radio cell / sector.

The method according to one of claims 19 to 34, further characterized in that it additionally comprises the step of signaling information related to channel qualities in a cell / radio sector of the / his radio cell to at least one cell / adjacent radio sector.

26. The method according to claim 24 or 25, further characterized in that it additionally comprises the step of signaling the information for a control unit to the communication system.

The method according to one of claims 15 to 26, further characterized in that it additionally comprises the step of indicating information related to a subcarrier block assignment and / or a subcarrier block group assignment to a communication terminal.

28.- A base station in a wireless communication system, the system comprising a plurality of radio cells in which a plurality of subcarrier blocks are used for communication, wherein each subcarrier block comprises a plurality of subcarriers, wherein a number of adjacent radio cells construct a group of cells, the base stations comprising: processing means for grouping said subcarrier blocks into a plurality of groups of subcarrier blocks in each radio cell of the cell group, determining means for determining a plurality of transmission power scales for each of the radio cell of said cell group, energy control means for performing energy control within a scale of transmission energy levels defined by said plurality of energy scales of transmission, allocation means for assigning the plurality of energy scales of transmission energy to the subcarrier block groups of the cells in the cell group radio.

29. The base station according to claim 28, further characterized in that the radio cells of the cell group each comprise groups of corresponding subcarrier blocks having the same subcarrier.

30. The base station according to claim 29, further characterized in that said allocation means is adapted to assign said plurality of transmit power scales to the radio cell subcarrier block groups of the cell group, for that in a single radio cell, there is a location of each of said plurality of transmission power scales for a subcarrier group of said individual radio cell, and there is a location of each of said plurality of power scales transmission for one of said groups of corresponding subcarrier blocks in the radio cells of said cell group.

31. The base station according to claim 29 or 30, further characterized in that said allocation means are adapted to assign said plurality of transmit power scales to the groups of subcarrier blocks of radio cells of cell group, so that in a cell of individual radius, there is a delineation of each said plurality of groups of subcarrier blocks of said individual radio cell for the transmission energy scale, and there is a location of each of said groups of corresponding subcarrier blocks in said radio cells of said cell group to one of said plurality of Transmission energy scales.

32.- A base in a wireless communication system, the system comprising a plurality of radio cells in which a plurality of subcarrier blocks is used for communication, wherein each subcarrier block comprises a plurality of subcarriers, wherein N cells adjacent radio stations construct a cell group, N being an integer of 2 or more, the base station comprising: process means for grouping said subcarrier blocks into N groups of subcarrier block in each radio cell of the cell group, in where the radio cell of the cell group each comprises groups of corresponding subcarrier blocks having the same subcarrier, determining means for determining N transmission power scales for each of the radio cell of said cell group, means of energy control to perform energy control within a scale of transmission energy levels defined by said plurality Transmission energy scales, assign means to assign N transmission power scales to the N groups of subcarrier blocks of radio cells of the cell group, so that each of N transmission power scales in the radio cell is assigned of N groups of subcarrier blocks of said radio cell, and each of N transmission power scales is assigned to a group of subcarrier blocks of corresponding subcarrier block groups.

33.- A base station in a wireless communication system, the system comprising a plurality of radio cells in which a plurality of subcarrier blocks is used for communication, wherein each subcarrier block comprises a plurality of subcarriers, wherein N adjacent radio cells construct a group of cells, N being an integer of 2 or more, the base station comprising: processing means for grouping said subcarrier blocks into x | N groups of subcarrier blocks in each radio cell of the cell group, wherein the radio cells of the cell group each comprise groups of corresponding subcarrier blocks having the same subcarrier, x being an integer of 1 or more, determining means for determining and | N energy scales of transmission for each of the radio cells of said cell group, and being an integer of 1 or more, energy control means for performing ol of energy within a scale of transmission energy levels defined by one of said plurality of transmission power scales, assignment means for assigning and | N transmission power scales ax | N groups of subcarrier blocks of radio cells of the cell group, so that each of the | y | n transmission power scales of a radio cell is assigned to one of x | N groups of subcarrier blocks of said radio cell, and y / x transmission power scales above the average are assigned to a subcarrier group group of corresponding subcarrier block groups.

34.- A base station in a wireless communication system, the system comprising a plurality of radio cells each comprising at least two sectors, wherein in each sector a plurality of subcarrier blocks is used for communication, in wherein each subcarrier block comprises a plurality of subcarriers, wherein a number of adjacent radio cells build a cell group, the base station comprising: processing means for grouping said subcarrier blocks into a plurality of groups of subcarrier blocks in each sector of each radio cell of said group, determining means for determining a plurality of transmission energy scales for each sector of each radio cell of the cell group, energy control means for performing energy control within a defined scale of energy levels of transmission by one of said plurality of transmission power scales, allocation means for assigning the plurality of transmit power scales to the plurality of groups of subcarrier blocks of a sector of a radio cell and their adjacent sectors of said other data cells. radio.

35.- The base station according to claim 34, further characterized in that each sector of a radio cell has adjacent sectors in the other radio cells of the cell group, and wherein a sector of the radio radio cell and its adjacent sectors in said other radio cells construct a sector group and each comprises a corresponding subcarrier block group having the same subcarriers.

36.- The base station according to claim 35, further characterized in that said allocation means are adapted to assign said plurality of transmit power scales to the groups of subcarrier blocks of radio cells of the group of cells, so that a individual sector of a radio cell, there is a location of each of said plurality of transmission energy scales for a group of subcarrier blocks of said sector, and there is a location of each of said plurality of transmission energy scale for one of said groups of corresponding subcarrier block in said sector group.

37.- The base station according to claim 35 or 36, further characterized in that said allocation means are adapted to assign said plurality of transmit power scales to the groups of subcarrier blocks of said radio cells of the cell group, for that in a single sector of a radio cell, there is a location of each of said plurality of groups of subcarrier blocks of said sector for a transmission energy scale, and there is a location of each said plurality of said block groups corresponding subcarrier in said sector group for a transmission power scale.

38. - A base station in a wireless communication system, the system comprising a plurality of radio cells each comprising at least two sectors, wherein in each sector a plurality of subcarrier blocks is used for communication, wherein each subcarrier comprises a plurality of subcarriers, and wherein a number of adjacent radio cells builds a cell group, the base station comprises: processing means for grouping said subcarrier blocks into N groups of subcarrier blocks in each of the sectors and each radio cell of said group, wherein each sector of a radio cell has N-1 adjacent sectors in the other radio cells of the cell group, and wherein a sector of a radio cell and its adjacent sectors in said other radio cells each comprising groups of corresponding subcarrier blocks having the same subcarrier, N being an integer of 2 or more, determining means n to determine N transmission power scales for sector of each cell of cell group radio, energy control means for performing energy control within a range of transmission energy levels defined by one of said plurality of power scales; transmission energy, allocation means for assigning the N transmission power scales to N groups of subcarrier blocks of a sector of a radio cell in their adjacent sectors of said other radio cells, so that in a sector, each of N transmission power scales in a sector of a radio cell is assigned to one of the groups of subcarrier blocks N of said sector, and each of N transmission power scales is assigned to a group of corresponding subcarrier block sectors .

39.- A base station in a wireless communication system, the system comprising a plurality of cells each comprising at least two sectors, wherein in each sector a plurality of subcarrier blocks is used for communication, wherein each subcarrier block comprises a plurality of subcarriers, and wherein N adjacent radio cells construct a cell group, the base station comprising: processing means for grouping said subcarrier blocks into x | N groups of subcarrier blocks in each of the sectors of each radio cell of said group, wherein each sector of a radio cell has N-1 adjacent sectors in the other radio cells of the cell group, and wherein a sector of a radio cell and its adjacent sectors in said other radio cells comprise corresponding subcarrier block group having the same subcarrier, x being an integer of 1 or more and N being an integer of 2 or more, determining means for determining and | N transmission power scales for each sector of each cell cell radio cell, and being an integer of 1 or more, energy control means for performing energy control within of a scale of transmission power levels defined by said plurality of transmission power scales, allocation means for assigning the y | N transmission power scales ax | N groups of subcarrier blocks of a sector of a radio cell and its adjacent sectors of said other radio cells, so that in a sector, each of y | N transmission power scales in a sector of a radio cell is assigned to one of x | N groups of subcarrier blocks of said Sector e and / x Transmission energy scales above the average are assigned to a group of corresponding subcarrier sector blocks.

40.- The base station according to one of claims 28 to 39, further characterized in that the base station is adapted to perform the method according to one of claims 1 to 27.

41.- The base station according to a of claims 28 to 40, further characterized in that it further comprises: measuring means for measuring the path loss of a communication signal of a communication terminal and the path loss due to interference between adjacent sectors for said communication signal, and the allocation means are adapted to assign the communication terminal to one of said groups of subcarrier blocks based on said measurements.

42.- A communication terminal in a wireless communication system, the system comprising a plurality of radio cells in which a plurality of subcarrier blocks is used for communication, wherein each subcarrier comprises a plurality of subcarriers, the end of communication comprising energy control means for performing energy control between a base station of a radio cell communicating with the communication terminal, wherein the energy control means is adapted to perform energy control on a scale of control of transmission energy in a range defined by a transmission energy level of zero and a maximum transmission energy level.

43.- The communication terminal according to claim 42, further characterized in that it further comprises receiving means for receiving information indicating a subcarrier block assignment and / or a subcarrier group group assignment, and selection means for selecting the designated assigned subcarrier block and / or group of assigned subcarrier blocks designated for data transmission.

44. A radio communication system comprising a station according to one of claims 28 to 41 and at least one communication terminal according to claim 42 or 43.