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WO2008003195A1 - Procédé d'affectation adaptative des ressources dans un système à accès multiple par répartition orthogonale de la fréquence - Google Patents

Procédé d'affectation adaptative des ressources dans un système à accès multiple par répartition orthogonale de la fréquence Download PDF

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Publication number
WO2008003195A1
WO2008003195A1 PCT/CN2006/003753 CN2006003753W WO2008003195A1 WO 2008003195 A1 WO2008003195 A1 WO 2008003195A1 CN 2006003753 W CN2006003753 W CN 2006003753W WO 2008003195 A1 WO2008003195 A1 WO 2008003195A1
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WO
WIPO (PCT)
Prior art keywords
user
subcarriers
base station
activated
subcarrier
Prior art date
Application number
PCT/CN2006/003753
Other languages
English (en)
Chinese (zh)
Inventor
Xiaokui Jiang
Li Zhang
Yanwen Wang
Qiang Wang
Original Assignee
Zte Corporation
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 Zte Corporation filed Critical Zte Corporation
Publication of WO2008003195A1 publication Critical patent/WO2008003195A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to a wireless mobile communication system, and in particular to a method for implementing adaptive resource allocation in an Orthogonal Frequency Division Multiple Access (OFDMA) system.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • a subcarrier allocation method is implemented in an Orthogonal Frequency Division Multiple Access (OFDMA) system.
  • OFDM Orthogonal Frequency Division Multiple Access
  • Orthogonal frequency division multiplexing has become a key technology of B3G (Beyond Three Generation) mobile communication system because of its high spectrum utilization efficiency and natural immunity to frequency selective fading.
  • B3G Beyond Three Generation
  • the OFDM system has a wide frequency resource, and the channel response on each subcarrier is very different. Therefore, OFDM can select different modulation modes for each subcarrier according to the principle of spectrum utilization and optimal balance. To achieve optimal use of resources.
  • channel resources are shared by multiple users at the same time, but the physical channels experienced by each user and the base station are different, that is, on each subcarrier, the channel response of each user is not The same, therefore, in order to fully increase the data rate of the system, the sub-carrier allocation between multiple users must be assigned to the channel response of each user on each OFDM subcarrier.
  • An excellent subcarrier allocation algorithm must be simultaneously Good performance on the evaluation indicators: spectrum efficiency or average number of bits that can be transmitted on each subcarrier, fairness to each user, and real-time and complexity of algorithm implementation.
  • Orthogonal Frequency Division Multiple Access Multiple Access In an (OFDMA) system, the concept of a resource can be defined as a set of available subcarriers in a fixed frequency bandwidth.
  • the allocation of resources refers to the most efficient spectrum utilization in a cell-based mobile cellular system based on the channel conditions of the user. The method allocates appropriate subcarriers for each user to meet the communication service requirements of the user. In multi-user OFDMA systems, the allocation of subcarriers is an important issue. OFDMA uses OFDM technology to distinguish users. In an OFDM system, the entire frequency band is divided into a number of subcarriers, each of which is orthogonal to each other and overlaps in frequency spectrum.
  • OFDMA Since data is transmitted in parallel on different subcarriers, OFDMA is a frequency reuse access method.
  • the OFDMA concept is essentially the same as FDMA, but it has some advantages that FDMA does not have.
  • the subcarriers are mainly used to distinguish users. Therefore, within one frame time (of course, other time units, as long as the time unit is much smaller than the coherence time of the channel), after a user occupies a certain subcarrier, This subcarrier can no longer be assigned to other users.
  • each user is allocated a certain number of subcarriers, so that the total transmission power is minimized. All subcarriers are thus assigned to these users to meet the minimum requirements of these users.
  • This is a static allocation method, provided that the base station knows the total number of users, the channel conditions for each user, and the business needs.
  • Subcarriers of a real-time multi-user OFDM system given by US Patent US 2005/0078759 Al "subcairier and bit allocation for real time services in multiuser orthogonal frequency division multiplex (OFDM) systems", published April 14, 2005
  • OFDM orthogonal frequency division multiplex
  • the subcarrier with the smallest power increase caused by adding one bit is used.
  • the drawback of this method is that it is necessary to determine the water injection level parameter of each user through iteration.
  • the convergence speed is very slow.
  • the user requests the access system to be random, and the number of subcarriers that each user does not use is as large as possible, that is, the number of subcarriers required by each user has an upper limit and a lower limit.
  • JM has few technical documents to consider the allocation of subcarriers when a new user requests to enter the system.
  • the problem to be solved by the present invention is: When a user applies to access the system, and each time Only one user is allowed to access in the inter-cell, and the system adaptively allocates sub-carriers according to changes in user channel conditions under the conditions of transmission rate and power limitation, so that the total transmission power of the system is minimized, and the total transmission rate of the system tends to be maximized. Chemical.
  • An adaptive resource allocation method in an orthogonal frequency division multiplexing multiple access system includes: an active user that has determined the minimum number of subcarriers to be allocated in the system; The following processing steps are performed when the user to be activated is ready to enter: The first step is: the sum of the number of subcarriers required by the system, the total number of subcarriers allowed by the system, and the total number of subcarriers allowed by the system. The base station determines the number of users that can be allowed to access the subcarrier allocation. In the second step, according to the constraint that the minimum transmit power is met, the user with the smallest absolute value of the transmit power increment when adding one subcarrier will obtain the number of subcarriers.
  • the base station determines the number of subcarriers that can be allocated and the power that can be allocated to each user that can obtain the subcarrier allocation.
  • the exact subcarrier allocated by the base station to each user is notified by the base station through the downlink control channel.
  • the corresponding user enters the business transmission.
  • the first step 3 ⁇ 4 ⁇ 4 further includes the following steps: Step 1: The user to be activated reports the minimum transmission rate requirement information and channel state information that can be accepted to the base station; Step 2: The base station uses the information reported by the user to be activated to estimate that the information can be satisfied.
  • Step 3 The base station determines whether the sum of the minimum number of subcarriers required by all users in the active and inactive users exceeds the total number of subcarriers allowed by the system, if greater than or equal to The user to be activated is not assigned any subcarriers, and then directly transferred to the second step; if less, after the subcarriers are allocated to the user to be activated, the second step is transferred.
  • the second step further includes the following processing: Step 1: The base station estimates that each of the active user and the user to be activated meets the basic subcarrier of each user.
  • Step 2 The base station estimates the maximum number of subcarriers required by each user;
  • Step 3 The base station estimates the average channel gain of each of the active users and the users to be activated participating in the subcarrier allocation; 4: The base station estimates that each user adds a power increment corresponding to one subcarrier;
  • Step 5 The base station seeks the user with the smallest power increment;
  • Step 6 The number of subcarriers of the user and the required power;
  • Step 7 Number of remaining subcarriers Decrease by 1;
  • Step 8 Repeat steps 3 through 6 until all subcarriers have been allocated.
  • the second step further includes the following processing: Step 9: The base station estimates whether the number of subcarriers of each of the activated user and the user to be activated exceeds the maximum number of subcarriers required by the user, and if it is less than or equal to, Step 10: If it is greater, go to step 11; Step 10: The user finally allocates the number of subcarriers and the power is not adjusted, and directly enters the third step; Step 11: The number of finally allocated subcarriers of the user is a basic subcarrier Resources, while adjusting the power and then directly into the third step.
  • the invention mainly solves the problem of determining the number of subcarriers when a user applies for accessing a system.
  • FIG. 1 is a schematic flowchart of adaptive subcarrier allocation in an OFDMA system according to an embodiment of the present invention
  • 2 is a schematic diagram of determining a number of allocated subcarriers per user and a power allocation process in an OFDMA system according to an embodiment of the present invention.
  • the present invention provides a method for implementing resource allocation in an Orthogonal Frequency Division Multiple Access (OFDMA) system, the basic idea of which is to satisfy the basic service requirements of each user in the system.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • the basic idea of which is to satisfy the basic service requirements of each user in the system.
  • allocate more subcarriers to each user as much as possible to improve the data transmission rate of the system and the frequency utilization efficiency of the system, and make full use of the resources of the wireless system. As shown in FIG.
  • Max Max
  • coding modulation scheme adopted its value depends on the system, ceil (x ) indicates that the real number X is rounded in the direction of positive infinity.
  • the base station counts the sum of the minimum number of subcarriers required by all users in the set.
  • N exceeds the total number of subcarriers available in the system N, ie ZN ⁇ N ', no user is assigned any subcarriers', that is, the system does not currently have enough frequency resources to support the basic business requirements of user K;
  • N m k ia is smaller than the total number available in the system sub-carriers N, i.e. H ⁇ N, the frequency indicating the system has enough resources to support the basic service users K, that is, at least in sub-carriers may be allocated to users.
  • Hujun Yin and Hui Liu abandoned in IEEE Globecom'OO.
  • the method provided in the method is that the user with the smallest absolute value of the transmit power increment when adding one subcarrier will obtain an increase in the number of subcarriers under the condition that the minimum transmit power is satisfied. That is, if user 1 has determined the least 3 ⁇ 4 subcarrier allocation, then add a subcarrier Time required for the power increment ⁇ ⁇ For all users, the user with the smallest power increment is determined, that is, argmin ⁇ A, and the number of subcarriers allocated to the user is increased by 1, and the transmission power thereof is correspondingly increased, that is, P k + J .
  • ⁇ is the average channel gain of user 1, which can be directly estimated by the channel state information reported by the user.
  • Such a subcarrier (the portion of the subcarriers remaining in the system after the above-mentioned allocation of the minimum number of subcarriers required by each user is allocated) is increased until the sum of the number of subcarriers allocated by all users in the user set is allowed by the system.
  • the system may not be able to meet the business needs of each user, since the number of subcarriers some users may exceed the maximum number of subcarriers ax the user at the lowest transmission rate required by the circumstances of That is, where ? ?
  • micript indicates the minimum transmission rate that each subcarrier can allow, the value of which depends on the coded modulation scheme adopted by the system.
  • the subcarrier resources more than W, ax are a kind of waste for the user.
  • the user's business requirements do not require so many subcarriers.
  • additional signaling overhead is required. Therefore, in order to simplify the operation of the system, this situation is encountered. Assign users the basic subcarrier resources, that is, take At the same time adjust its transmit power value.
  • the step 100 is determined by the base station to determine the number of users allowed to access the system, and further includes the following implementation steps:
  • the user reports the minimum transmission rate requirement information f in and the channel state information to the base station, wherein the user indicates the channel response of the user on the Mth subcarrier; (2) the base station estimates the information by using the information reported by the user.
  • the base station determines the number of subcarriers that each user can allocate and the power step 200, and further includes the following implementation steps;
  • the base station estimates that the number of subcarriers remaining after the allocation of the basic subcarriers of each user in the user set is satisfied, that is, N. ;
  • the base station estimates the maximum number of subcarriers N rax required for each user, that is, N,
  • the base station estimates the average channel gain for each user in the set of users participating in the subcarrier allocation t/
  • the base station estimates that each user adds a power increment corresponding to one subcarrier ⁇ ⁇ .
  • step G the base station estimates whether the number of subcarriers N A of each user in the user set ⁇ / exceeds the maximum number of subcarriers N required by the user, and if N A ⁇ N, A rax , then proceeds to step G), otherwise Transfer to step (1 ⁇ );
  • the number of final allocated subcarriers of the user is N A
  • the base station determines a step 300 of the exact subcarrier allocated by each user. After each user allocates the exact subcarrier (including the number and location) and the power is determined, the base station notifies the corresponding user through the downlink control channel, and then follows the This kind of agreement enters into the business transmission.

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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 système de communication mobile sans fil. Plus particulièrement, l'invention concerne un procédé d'affectation adaptative des ressources dans un système à accès multiple par répartition orthogonale de la fréquence. Selon ce procédé, une station de base détermine le nombre d'utilisateurs disposant d'une autorisation d'accès (soit l'utilisateur pouvant obtenir une affectation de sous-porteuse), la station de base détermine le nombre et la puissance des sous-porteuses susceptibles d'être affectées aux utilisateurs, et la station de base détermine le nombre effectif de sous-porteuses affectées à chaque utilisateur. Le principal problème résolu par l'invention est lié au mode de détermination du nombre des sous-porteuses lorsqu'un utilisateur demande un accès au système, ce qui constitue une procédure d'affectation de sous-porteuse dynamique par opposition à la procédure d'affectation de sous-porteuse statique classique. En outre, avec la règle de réduction de la puissance de transmission du système, chaque utilisateur est susceptible de se voir affecter un nombre suffisant de sous-porteuses, ce qui permet une réalisation complète de la diversité en fréquence. En outre, l'invention permet de surmonter les difficultés liées à la complexité de la procédure itérative pour la détermination du niveau de water-filling dans le procédé de water-filling, et ne requiert aucune procédure itérative, d'où un fonctionnement simplifié.
PCT/CN2006/003753 2006-06-29 2006-12-30 Procédé d'affectation adaptative des ressources dans un système à accès multiple par répartition orthogonale de la fréquence WO2008003195A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200610090574A CN101098326B (zh) 2006-06-29 2006-06-29 一种正交频分复用多址接入系统中的自适应资源分配方法
CN200610090574.8 2006-06-29

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Cited By (3)

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CN107911853A (zh) * 2017-10-18 2018-04-13 重庆邮电大学 一种基于蚁群算法的scma系统资源分配算法
CN111432473A (zh) * 2019-01-09 2020-07-17 成都鼎桥通信技术有限公司 数字集群的载波调度方法和装置
CN112804715A (zh) * 2021-01-12 2021-05-14 南京邮电大学 面向异构业务需求的移动边缘计算网络用户接入控制方法

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WO2009117874A1 (fr) * 2008-03-28 2009-10-01 Huawei Technologies Co., Ltd. Réduction de puissance émise hors bande
US8964536B2 (en) * 2009-10-05 2015-02-24 Qualcomm Incorporated Apparatus and method for dynamic load balancing in a multi-carrier wireless communication system
CN101720129B (zh) * 2009-11-17 2012-02-15 华为技术有限公司 资源分配方法、基站及通信系统
CN103188685B (zh) * 2011-12-27 2016-06-22 华为技术有限公司 无线资源分配方法和设备
CN102781101B (zh) * 2012-01-06 2015-01-07 宁波大学 一种ofdma中继系统的资源分配方法
EP3496491A1 (fr) 2012-07-19 2019-06-12 Nippon Telegraph and Telephone Corporation Système et procédé de communication sans fil
CN104185265B (zh) * 2013-05-21 2018-03-20 电信科学技术研究院 一种功率分配方法及装置
CN105657846B (zh) * 2016-03-04 2019-04-02 金陵科技学院 一种功率最小化的双层迭代ofdm子载波分配算法
CN106851835B (zh) * 2017-01-06 2019-10-15 北京邮电大学 一种资源分配方法及装置

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WO2005015770A1 (fr) * 2003-08-08 2005-02-17 Intel Corporation Procede adaptatif de chargement des bits et d'allocation de puissance dans un systeme de communications sans fil a ondes porteuses multiples
US20050078759A1 (en) * 2003-08-27 2005-04-14 Interdigital Technology Corporation Subcarrier and bit allocation for real time services in multiuser orthogonal frequency division multiplex (OFDM) systems

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN107911853A (zh) * 2017-10-18 2018-04-13 重庆邮电大学 一种基于蚁群算法的scma系统资源分配算法
CN107911853B (zh) * 2017-10-18 2021-05-18 重庆邮电大学 一种基于蚁群算法的scma系统资源分配算法
CN111432473A (zh) * 2019-01-09 2020-07-17 成都鼎桥通信技术有限公司 数字集群的载波调度方法和装置
CN112804715A (zh) * 2021-01-12 2021-05-14 南京邮电大学 面向异构业务需求的移动边缘计算网络用户接入控制方法

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CN101098326A (zh) 2008-01-02

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