WO2006116928A1 - Procédé de répartition de ressources dans un système à porteurs multiples - Google Patents

Procédé de répartition de ressources dans un système à porteurs multiples Download PDF

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Publication number
WO2006116928A1
WO2006116928A1 PCT/CN2006/000836 CN2006000836W WO2006116928A1 WO 2006116928 A1 WO2006116928 A1 WO 2006116928A1 CN 2006000836 W CN2006000836 W CN 2006000836W WO 2006116928 A1 WO2006116928 A1 WO 2006116928A1
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WO
WIPO (PCT)
Prior art keywords
cell
frequency
user
resource
frequency resource
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Application number
PCT/CN2006/000836
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English (en)
Chinese (zh)
Inventor
Bingyu Qu
Sha Ma
Yujuan He
Xuezhi Yang
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Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2006116928A1 publication Critical patent/WO2006116928A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a resource allocation method in a multi-carrier system. Background of the invention
  • wireless communication systems usually use geographical regions for differentiation, and achieve frequency reuse such as cellular wireless communication systems, thereby increasing the capacity of wireless communication systems.
  • Each communication area in a wireless communication system may be referred to as a cell.
  • a code division multiple access (CDMA) system can easily achieve a frequency reuse factor of 1 by using different cell scrambling codes to obtain high spectrum utilization.
  • CDMA code division multiple access
  • the small-area interference is relatively uniform and can usually be regarded as white noise, but as long as multipath exists, the orthogonality of the code will not be maintained. Since the transmission information of each code division user occupies all the bandwidth, it is difficult to reduce inter-user interference by the code design of the transmission end.
  • a complex algorithm is used to estimate and eliminate the interference.
  • the guarantee of the user performance of the CDMA cell boundary with a frequency reuse factor of 1 is obtained by soft/softer handover, and usually requires a continuous dedicated channel to continuously accumulate the channel condition, and there is no multiple base station resource scheduling conflict.
  • the channel for transmitting service data is of a shared type, and it is difficult to implement soft handover, and the soft combining gain cannot be utilized, resulting in a difference in the satisfaction of the boundary users.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the OFDM system can also avoid or reduce inter-cell interference from the transmitting end by designing the time-frequency pattern.
  • the multi-carrier system can also achieve frequency reuse factor of 1 by means of frequency hopping, time domain/frequency domain spreading. Moreover, since the frequency resources of the multi-carrier system can be configured and scheduled on the sub-carrier granularity, the resource occupancy of the user, especially the cell border user, can be coordinated at the transmitting end, thereby reducing inter-cell interference and improving system capacity. .
  • one method currently implemented to achieve a frequency reuse factor of 1 is: a frequency hopping OFDM downlink design that does not require frequency planning.
  • the method obtains the orthogonality of the users in the cell through the clever time-frequency pattern design, and achieves the effect of averaging the inter-cell interference.
  • FIG. 1 shows the performance of the Costas sequence on the time-frequency plane, and the method is based on Costas.
  • the characteristics of the sequence, all cyclic frequency shifts of the corresponding Costas sequence form a time-frequency pattern group, and each transmission time interval (TTI), the available time-frequency pattern set of each cell is a different time cyclic shift of the time-frequency pattern group .
  • TTI transmission time interval
  • the time-frequency pattern thus designed satisfies the following characteristics:
  • the distance between two adjacent grid points in the time-frequency pattern thus generated is the most The small value is large, and the minimum value of the sum of the time domain division grid number and the frequency domain separation grid number is 3, that is, the time-frequency pattern formed by this method has a good frequency diversity effect.
  • the base station of the cell in order to ensure correct reception of the cell border users, the base station of the cell will increase the transmission power to the border users. In this way, the user located at the boundary of the cell becomes the main interference source of the neighboring cell. At the same time, cell border users are also the main victims of neighbor cell interference.
  • the above-mentioned frequency hopping mode is to achieve the averaging of the inter-cell interference as much as possible, and by the design of the frequency hopping mode, the load of the neighboring cell can also be substantially distributed on the time-frequency plane, that is, for the boundary user of the cell.
  • the interference point distribution is relatively uniform; however, the amount of neighbor cell interference received on different subcarriers is still non-uniform, that is, the boundary user with large transmission power will have greater interference to the boundary users of the neighboring cells.
  • an object of the present invention is to provide a resource allocation method for a multi-carrier system, which can adopt a separate method while ensuring that the basic hopping or spreading methods are unchanged.
  • Resource allocation scheme which effectively reduces interference between users in neighboring cells.
  • a resource allocation method for a multi-carrier system includes: A. Set the primary frequency resource and the secondary frequency resource for the cell, and the primary frequency resources set by the neighboring cells are different;
  • the primary frequency resource is first allocated to the user in the cell.
  • the secondary frequency resource is allocated to the remaining users in the cell.
  • the method for setting the primary frequency resource in step A is as follows:
  • the corresponding primary frequency resource is fixedly set for each cell.
  • the method further includes: adjusting the primary frequency resources set by each cell according to the set time interval.
  • the method further includes: setting a primary frequency resource and a secondary frequency resource for the newly added cells in the multi-carrier system.
  • the primary frequency resource is a continuous frequency band or a discontinuous frequency band.
  • the method for setting the primary frequency resource in step A is as follows:
  • different primary frequency resources are set for all or a preset number of cells.
  • the step B is specifically:
  • the cell For the downlink direction of the multi-carrier system, in the cell, according to the transmission power from large to small, a preset number of users are selected, and the selected user is allocated the primary frequency resource in the cell; when the primary frequency resources in the cell are already When occupied, the remaining cell users are allocated secondary frequency resources outside the primary frequency resources in the cell.
  • the user who first allocates the primary frequency resource according to B is: a high-power user;
  • the method further includes: determining a user with a large transmission power in the cell.
  • the high power user is a user at a cell boundary.
  • the user who first allocates the primary frequency resource in step B is:
  • the method further includes: determining, in the cell, a user that causes large interference to other users.
  • the large interfering user is a user at a cell boundary.
  • the method further includes: setting a primary frequency resource for a newly added cell in the multi-carrier system, and performing frequency multiplexing by using frequency hopping or spreading.
  • the primary frequency resources of each cell in step A are implemented by different sets of time domain rotation factors, and the sets of primary twirl factors set by each neighboring cell are different. ;
  • step B is specifically:
  • a user at the cell boundary is assigned one or more rotation factors in the set of primary twiddle factors.
  • the method also includes:
  • the downlink common pilot occupies the primary frequency resource, and when the cell has no primary frequency resource, the randomized pilot in the single-frequency networking mode is used.
  • the present invention mainly improves the normal single-frequency networking mode, and prioritizes the occupation of the primary frequency resources that do not overlap each adjacent cell in resource scheduling, and prioritizes Consider that the high-power user occupies the main frequency resource, so that the main interfering users in the neighboring cells are staggered by different frequencies, and then the P inter-cells have low total inter-cell interference.
  • the primary frequency resource does not require complex dynamic adjustment and unified scheduling. Once the primary frequency resource is insufficient, the normal single frequency networking mode can be continued.
  • the invention can reduce the distribution of major interference sources between cells and improve system capacity without maintaining complicated planning and multi-cell coordination under the premise of maintaining the characteristics of the single frequency network.
  • Figure 1 is a schematic diagram showing the performance of the Costas sequence in the time-frequency plane
  • 2 is a schematic diagram of frequency resource allocation of adjacent cells
  • FIG. 3 shows the comb spectrum in the IFDMA system. Mode for carrying out the invention
  • the frequency resource of the cell is divided into two parts: a primary frequency resource and a secondary frequency resource, and the primary frequency resources of the adjacent cells are mutually offset, that is, different, to avoid mutual interference.
  • the primary frequency resource can be a continuous frequency band or a discontinuous frequency band.
  • the primary frequency resource is preferentially occupied.
  • the high-power user occupies the primary frequency resource preferentially; if there are many users, some of the high-power users have occupied the primary frequency resource. After that, the remaining high-power users can still occupy the remaining sub-frequency resources; in this case, the resource allocation scheme of the usual single-frequency networking, such as frequency hopping and spreading, is adopted.
  • a user with a large transmission power needs to occupy the primary frequency.
  • the resources so that the frequency resources occupied by the large transmission power users of the neighboring cells can be distinguished, and the P strips have low interference to the users of the neighboring cells.
  • other users with smaller transmit power in the cell such as cell core area users, may occupy secondary frequency resources during scheduling.
  • the primary frequency resource may have been occupied.
  • the large transmission power user may also occupy the secondary frequency resource, and the common frequency reuse factor is
  • the resource occupancy mode of 1 reduces inter-cell interference, such as frequency hopping and spreading mode.
  • the present invention is an improvement based on the conventional single-frequency networking mode, and prioritizes high-power users in resource scheduling, and these high-power users preferentially occupy main frequency resources that do not overlap each neighboring cell.
  • the single frequency networking mode such as the usual frequency hopping is continued. Therefore, the frequency resources used by high-power users are staggered, thereby reducing inter-cell interference.
  • Low-power users and a small number of high-power users can use other frequency resources by means of frequency hopping to achieve adjacent cell frequency reuse. By controlling the frequency hopping time-frequency pattern of adjacent cells, the control of inter-cell interference can be achieved.
  • the primary frequency resource and the corresponding secondary frequency resource need to be set for the newly added cell; of course, if the cell is newly added in the multi-carrier system, When setting the main frequency resource is difficult or requires large network changes, the newly added cell may not set the main frequency resource, but still adopts frequency hopping or spreading to achieve full frequency reuse.
  • FIG. 2 is a schematic diagram of frequency resource allocation of neighboring cells. As shown in FIG. 2, it is assumed that cells A, B, and C are neighboring cells, and the same frequency resource is used; the entire frequency band of the frequency resource is divided into three non-overlapping For the part, as shown in FIG. 2, the frequencies &, b, c may be consecutive subcarriers or interlaced subcarriers, and FIG. 2 is only a schematic diagram.
  • the main frequency resources of cells A, B, and C are respectively frequencies a, b, and c, as shown in the shaded portion in Figure 2, and the sub-frequency resources are frequency 13 and frequency & and frequency & and 3 ⁇ 4», respectively.
  • the part other than the main frequency resource Since the proportion of high-power users in different cells always changes frequently, in order to adapt to such changes, the primary frequency resources that need to be set for each cell can be adjusted according to a set time interval, and the adjustment involves multiple cells, and The distribution of high-power users will not change too fast, so the time interval is set according to the stability requirements of the system, and it is usually set as long as possible, that is, the main frequency resources are slowly adjusted.
  • the user occupying the primary frequency resource a may be a high-power user or a low-power user. As long as the primary frequency resource a remains, it can be occupied by users in the cell, but the large transmission power user is preferentially occupied, that is, the transmission power is large. The user preferentially occupies the primary frequency resource a.
  • the design of the spreading and frequency hopping modes of the adjacent cells is exactly the same as the design of the common multiplexing factor of 1.
  • the design of the downlink common pilot can also occupy the primary frequency resource.
  • the randomized pilot can still be used.
  • the allocation of the primary frequency resources is pre-negotiated by each base station in the system.
  • the corresponding primary frequency resource can be set for it.
  • the primary frequency resource may not be set for it, that is, the original multiplexing factor is used to reduce the difficulty of planning.
  • the present invention is an improvement based on a reuse factor of 1. If the primary frequency resource can be planned, the corresponding plan is performed; if not, the original reuse factor is still used. mode. At the same time, in the case of planning, the neighboring cell users can divide the frequency by frequency, and can not continue to adopt the mode with the original multiplexing factor of 1.
  • the neighboring cells use the same frequency resource, and users of different cells use different hopping patterns at the same time, so that inter-cell interference is randomized.
  • high-power users are still the main source of interference.
  • the time-frequency resource distribution of such users affects the overall system capacity. Therefore, the present invention can effectively reduce interference and improve system capacity.
  • the neighboring cell users use inter-frequency resources, which can greatly reduce inter-cell interference.
  • the inter-frequency resources can be greatly reduced between the main interfering users, and the inter-cell interference can be greatly reduced.
  • a preset number of users are selected, and the selected user is allocated the primary frequency resource in the cell; When it is occupied, the remaining cell users are allocated secondary frequency resources in the cell.
  • the original frequency hopping design can still be used.
  • the present invention is also applicable to the uplink design, except that the user is no longer sorted according to the transmission power to distinguish between high-power users and low-power users, and the main consideration is users who cause large interference to other users, which are usually at the cell boundary, so For the uplink direction of the multi-carrier system, the primary frequency resource in the cell is preferentially allocated for the user at the cell boundary.
  • IFDMA interleaved frequency division multiple access
  • FDMA Interleaved FDMA
  • IFDMA is an effective multi-carrier transmission technology
  • user data is repeated and multiplied by time domain. With different twirl factors, in the frequency domain, they appear as a pair of "combs" that are interlaced.
  • the symbol in this block is now compressed so that it changes from the symbol duration Ts to the chip duration Tc, and then + ⁇ is repeated.
  • the repeated operation can be performed by an interleaver of ⁇ ⁇ ( + ⁇ ), and the obtained symbols are:
  • Each user's data block undergoes the same operation and appears as the same comb spectrum in frequency. To distinguish the users, select the user-specific phase vector:
  • / identifies a different twiddle factor
  • the twiddle factor corresponds to the occupied comb frequency resource
  • ie A rotation factor corresponds to a set of equally spaced discontinuous frequencies.
  • the vector is multiplied by the symbol c W by elements, so that each user's subcarrier coefficients are orthogonal, that is, the user's respective comb words are staggered.
  • 3 is a comb spectrum diagram in the IFDMA system, the coordinate axis in FIG. 3 is a frequency value indication, the shaded portion in FIG. 3 shows the frequency occupancy of the user i, and the blank portion shows the user j. Frequency occupancy.
  • the last user i's sent signal is:
  • the peaks of the IFDMA symbols are small and have a good frequency diversity effect. Moreover, the frequency domain comb spectrum of IFDMA symbols is realized by different twirl factors in the time domain. Single.
  • the IFDMA can also be combined with spread spectrum technology to achieve a frequency reuse factor of 1.
  • the primary frequency resource of each cell is implemented by different time domain rotation factor sets, and the set of primary rotation factors set by each neighboring cell is different; if the spread spectrum IFDMA is used in uplink transmission, it may be a cell boundary.
  • the large interfering user at the location assigns one or more twiddle factors in the set of primary twirl factors to form its comb spectrum, and the primary frequency resources formed at this time may be discontinuous frequency bands.
  • the present invention improves the usual single-frequency networking mode, and prioritizes the occupation of the main frequency resources that do not overlap each adjacent cell in the resource scheduling, and prioritizes the main frequency resources occupied by the high-power users. Therefore, the main interfering users of the neighboring cells are staggered by different frequencies, thereby reducing the total inter-cell interference. Moreover, the present invention can effectively reduce the characteristics of the single-frequency networking without complicated planning and multi-cell coordination. The small interval mainly interferes with the distribution of sources, thereby increasing system capacity.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L’invention concerne un procédé de répartition de ressources dans un système à porteurs multiples, qui améliore principalement le mode de travail en réseau à fréquence simple ce qui se traduit par un facteur de multiplexage de fréquence égal à 1, le procédé englobant les éléments suivants : évaluer de préférence l’occupation des ressources de fréquence principale ne se chevauchant pas et utilisées dans la cellule adjacente tout en affectant les ressources, et évaluer les ressources de fréquence principale de prédilection occupées par des utilisateurs d’interférence majeurs, pour organiser les utilisateurs d’interférence principale dans la cellule adjacente grâce à la fréquence différente et réduire l’interférence totale entre les cellules. Si les ressources de fréquence principale dans la cellule sont déjà occupées, le système répartit les ressources de fréquence auxiliaire entre les autres utilisateurs. Dans l’application de la présente invention, le mode de multiplexage des utilisateurs adopte le mode d’originalité dans le travail en réseau à simple fréquence, par exemple, saut de fréquence ou étalement de fréquence. La présente invention permet de réduire la répartition des ressources d’interférence principale entre les cellules et d’améliorer la capacité du système tout en préservant le caractère du travail en réseau à simple fréquence, et en se dispensant d’une planification complexe et d’une coordination parmi les cellules.
PCT/CN2006/000836 2005-04-29 2006-04-28 Procédé de répartition de ressources dans un système à porteurs multiples WO2006116928A1 (fr)

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CNB2005100694210A CN100531174C (zh) 2005-04-29 2005-04-29 频率复用因子为1的多载波系统中的资源分配方法
CN200510069421.0 2005-04-29

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CN101325445B (zh) * 2007-06-15 2012-11-14 中兴通讯股份有限公司 一种正交频分多址接入系统的动态组网方法
CN101340712B (zh) * 2007-07-06 2012-04-04 中兴通讯股份有限公司 多载波增强上行接入系统的调度信息上报方法
GB2452697A (en) 2007-08-14 2009-03-18 Nec Corp Dynamically allocating new resources to a node provided with persistently allocated resources
CN101442752B (zh) * 2007-11-21 2010-11-03 上海贝尔阿尔卡特股份有限公司 基站与用户终端中用于控制相邻小区间干扰的方法及装置
JP5106454B2 (ja) * 2009-03-18 2012-12-26 株式会社日立製作所 無線リソース制御方法及び基地局
CN103702430A (zh) * 2013-12-28 2014-04-02 杨学志 一种多级软时频复用和资源分配的方法、设备和系统

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