基于拉格朗日对偶的认知无线电网络最优资源分配算法

针对传统机会认知无线电网络容量有限的问题,提出了基于拉格朗日对偶的认知无线电网络最优资源分配算法。首先,将一个用户分配给每个子载波;然后,使用标准的凸优化方法确定每个子载波的对应功率,仅一个用户可获得功率正值;最后,利用拉格朗日对偶分解法同时分配CR网络中的子载波和功率,最大限度地提高系统的总容量。使用长期演进真实场景参数与空间信道传播模型评估了所提算法的有效性,仿真结果表明,相比次优资源分配算法,所提算法的总容量平均分别提高了9.3%,相比基于任意输入分布的最优资源分配算法,总容量提高了28.7%,并取得了较快的收敛速率,可以很好地用于解决无线电网络资源配置中的容量问题。     

宽带码分多址系统无线资源管理的最优实现

本文通过定性分析宽带码分多址（WCDMA）系统的业务吞吐量的最大化,推导出了WCDMA系统无线资源管理的两种最优化方案,第一种是用户以相同的速率传输数据,在每信道发射功率受限条件下分配最小的功率给用户;第二种是在总发射功率受限制条件下分配给用户不同的传输速率。文章最后通过实际系统的分析比较了这两种方案的实现效果。     

Method for optimal allocation of network resources based on discrete probability model

The method for optimal allocation of network resources based on discrete probability model is proposed. In order to take into account multiple coverage of the monitored points, the method constructs the discrete probability perception model of the network nodes. The model is introduced into the solution of the node coverage area, and the optimized parameters of the sensor optimization arrangement are used to optimize the layout of the multimedia sensor nodes. After setting the node scheduling standard, the interaction force between the sensor nodes and the points on the curve path is analyzed by the virtual force analysis method based on the discrete probability model At the same time On this basis, the path coverage algorithm based on the moving target is used to optimize the coverage of the wireless sensor network node in order to achieve optimal configuration of network resources. The experimental results show that the proposed method has good convergence and can complete the node coverage process in a short time. The introduction of the node selection criteria and the adoption of the dormant scheduling mechanism greatly improve the energy saving effect and enhance the network resource optimization effect.

     

Resource allocation for cellular radio systems

High terminal traffic densities are expected in urban multiuser radio systems. An efficient allocation of resources is the key to high system capacity. In this paper, a distributed dynamic resource allocation (DDRA) scheme based on local signal and interference measurements is proposed for multiuser radio networks. It offers “soft capacity” for time division multiple access (TDMA) and frequency division multiple access (FDMA) systems, bounded above by N per base station, where N is the total number of channels in the system. The decisions are made local to a terminal and its base and are essentially independent of the rest of the system. A distributed dynamic channel assignment scheme is used to assign channels to new calls. This scheme assigns a channel that offers the maximum carrier to interference ratio (CIR) to a new call. A distributed constrained power control (DCPC) scheme based on CIR measurements is used for power control. The channel assignment scheme and the power control scheme are coupled to obtain an interactive resource allocation scheme. We compare the capacity of a system which uses the distributed dynamic resource allocation scheme described above with the capacity of a system which uses the channel assignment scheme alone. The system capacity is measured by simulation as the number of terminals that can be served by the system with a CIR above an acceptable minimum. In a 1D cellular system, coupling the channel assignment scheme with power control is discussed. Simulations were also used to show the effect of varying the maximum transmitter power on system capacity     

浅论层次分析法在无线电频谱资源分配中的应用

在针对特定无线电频谱资源提出的申请方案中进行筛选．是一个难以定量分析的课题。广泛应用于管理决策的层次分析法为此提供了一种科学、简捷而实用的辅助分析手段。通过分解复杂问题、重组层次结构、进行两两比较的方法确定各个方案的相对重要性．并以此作为决策的依据。     

Reservation-based bandwidth allocation in a radio ATM network

The comparative performance of a number of reservation-based bandwidth sharing policies that could be used to maximize the link utilization and/or offer equally fair or preferential treatment to a class of supported users, is examined in the context of a radio asynchronous transfer mode local-area network (ATM LAN). Our analytical results, based an a recursion for the link occupancy distribution originally suggested by Kaufman (1981) and Roberts (1981) independently and subsequently extended to include finite source population models, are further extended in the cases of equal sharing of the resources with retries, and a dynamic sharing mechanism in which, when the available capacity is exceeded, weighted reductions for the active users' rates and queueing are employed. Next, examining the application of the above sharing schemes in an indoor radio environment, we apply switched diversity and a Reed-Solomon-based forward error correction (FEC) scheme to recover radio-related (Rayleigh fading) packet losses. The performance and the effects of the fading-mitigating switched-antenna-diversity mechanism and the required on a packet-basis coding protection are taken into account in order to establish the actual radio link throughput under the above conditions     

Sensing tasks allocation in cellular-based cognitive radio network

In Cognitive Radio (CR) Networks, especially in Cellular-based CR networks, in order to obtain the precise spectrum state which is available in the whole coverage, the spectrum sensing function need to be accomplished by the cooperation of multi-sensing nodes, i.e., cooperative spectrum sensing. This paper mainly focuses on the key question of the cooperative spectrum sensing: How many sensing nodes are required and how to allocate the sensing tasks to these sensing nodes in an effective way? In this paper, we classify the spectrum bands into three categories by a pre-sensing mechanism, in order to firstly exclude unavailable channels and select candidate channels for fine sensing in the next stage. Then the required number of sensing node for each candidate channel is determined by the proposed scheme. Through the scheme proposed in this paper, the sensing tasks allocation in cellular-based CR network can be accomplished in a high effective way and the sensing overhead could keep a low level.     

WCDMA网络资源故障及解决方案研究

随着联通WCDMA网络的快速发展,用户群也在不断扩张,尤其是对接受新生事物更为超前的大学生群体,愿意去接受手机上网等增值业务,虽然单个用户使用的流量并不高,但群体效益明显,且会在课间和晚上休息集中性上网,很容易造成CS业务和PS业务的拥塞。为了保障学生的使用感知度,避免用户量的流失,校园网络的优化就成了重中之重,校园周边站点的扩容势在必行。     

无线电频率资源管理和市场化配置构想

概述1.无线电频率资源管理的重要性当今随着无线电的应用迅速扩大,无线电通信已经成为人们日常生活中必不可少的一部分, 各种移动通信、卫星通信、广播电视、雷达导航、遥测遥控、射电天文等无线电业务的应用遍及国防、公共安全、商用和工业等各个部门,其业务量在日益增大。在一些情况下,当在移动状态不能使用其他通信方式时,在农村、海岛等边远地区有线通信不方便的情况下,或者在紧急情况及救灾时有线通信被中断时,水上和航空的紧急遇险和安全通信等,无线电通信就成为必不可少或唯一的通信手段。由于无线电波可以穿越国界、地区,许多无线电…     

Dynamic bandwidth allocation with fair scheduling for WCDMA systems

Dynamic bandwidth allocation (DBA) will play an important role in future broadband wireless networks, including the 3G and 4G WCDMA systems. A code-division generalized processor sharing (CDGPS) fair scheduling DBA scheme is proposed for WCDMA systems. The scheme exploits the capability of the WCDMA physical layer, reduces the computational complexity in the link layer, and allows channel rates to be dynamically and fairly scheduled in response to the variation of traffic rates. Deterministic delay bounds for heterogeneous packet traffic are derived. Simulation results show that the proposed CDGPS scheme is effective in supporting differentiated QoS, while achieving efficient utilization of radio resources.     

Efficient optimal and suboptimal radio resource allocation in OFDMA system

A fast optimal algorithm for solving radio resource allocation (RRA) problems in orthogonal frequency division multiple access (OFDMA) systems is proposed based on branch- and-bound (BnB) approach. The proposed algorithm offers the same performance as that achieved by some other existing optimal algorithms but with much reduced average computational complexity. As an effort in providing trade-off between performance and computational complexity, two suboptimal algorithms are also developed. Simulation results are shown to compare the performance and complexity of the proposed suboptimal algorithms with several existing algorithms.     

中继蜂窝网络中动态无线资源分配方案

提出一种中继蜂窝网络中基于动态复用分割的无线资源分配方案。该方案在所设计的帧结构基础上,从时间域和频率域进行联合的资源分配。其基本思想是通过小区间的协作使频带资源可以最有效的复用来提高系统性能。仿真结果论证了该方案在小区容量方面可以获得较大的增益。     

Pre-reservation based spectrum allocation for cognitive radio network

Studies on the current usage of the radio spectrum by several agencies have already revealed that a large fraction of the radio spectrum is inadequately utilized. This basic finding has led to numerous research initiatives. Cognitive radio technology is one of the key candidate technologies to solve the problems of spectrum scarcity and low spectrum utilization. However, random behavior of the primary user (PU) appears to be an enormous challenge. In this paper, a Pre-reservation based spectrum allocation method for cognitive radio network is proposed to apply a PU behavior aware joint spectrum band (SB) selection and allocation scheme. In the first step, the SB is observed in terms of PU usage statistics whereas in the second phase, a network operator (NO) using a spectrum allocation scheme is employed to allocate SBs among secondary users (SUs). We also introduce the concept of reservation and exchange functionality under the priority serving strategy in a time-varying framing process. Simulation results show that the proposed scheme outperforms existing schemes in terms of the spectrum utilization and network revenue. In addition, it helps NO to manage the spectrum on a planned basis with a systematical spectrum reservation management where the NO has the status of time slots. Moreover, SUs have an opportunity to reserve or instantly request a SB that maximizes the SUs satisfaction in terms of quality of experience.     

Downlink joint rate and power allocation in cellular multirate WCDMA systems

This paper proposes a novel dynamic joint rate and power control procedure for downlink data transmission in a multicell variable spreading factor wideband code-division multiple-access (WCDMA) system where the different users have similar quality-of-service requirements in terms of the signal-to-interference ratio (SIR). Two variations of the dynamic joint rate and power allocation procedure, namely, Algorithm-1 and Algorithm-2, are presented. The performances of these two schemes are compared to the performance of the optimal dynamic link adaptation for which the rate and power allocation is found by an exhaustive search. The optimality criterion is the maximization of the total radio link level capacity (or sum-rate capacity) in terms of the average number of radio link level frame transmitted per adaptation interval under constrained SIR and power limit in the base station transmitter. The proposed schemes have linear time complexity as compared to the exponential time complexity of the optimal scheme and achieve better radio link level throughput fairness compared to the optimal link adaptation scheme with a moderate loss in total throughput. Performance evaluation is carried out under random and directional micromobility models with uncorrelated and correlated long-term fading, respectively, in a cellular WCDMA environment for both the homogeneous (or uniform) and the nonhomogeneous (or nonuniform) traffic load scenarios.     

Capacity regions and optimal power allocation for CDMA cellular radio

The capacity region of code-division multiple access (CDMA) is determined by the set of transmission rates combined with quality-of-service (QoS) requirements which allow for a feasible power allocation scheme for n mobiles in a cellular network. The geometrical and topological properties of the capacity region are investigated in the present paper for the case of unlimited and limited power, respectively. As a central result, we show that the capacity region is convex by breaking the complicated topological structure into characteristic properties of its boundary and interior points, each of interest in itself. Based on these results, we furthermore investigate optimal power assignment schemes in the case that the demand of a community of users is infeasible. Weighted minimax and Bayes solutions are explicitly determined as appropriate means to share the capacity of a cellular network in a reasonable and fair way.     

我国无线电频率资源分配方式变革初探

长期以来,我国对无线电频率资源的分配一直沿用行政审批的单一模式。随着各种无线电新技术和新业务的广泛应用,从目前来看,这种单一的行政审批分配无线电频率资源的模式以及与之相配套的较低的频率占用费收费标准,已经不适应我国无线电通信业务飞速发展的需要,不适应通信业市场竞争的新形势。为贯彻落实国家关于减少行政审批,充分利用市场机制进行资源配置的精神,对传统的无线电频率资源分配方式进行改革已势在必行。从我国的情况来看,除了行政审批的模式之外,也可以尝试采用招标、拍卖等方式对无线电频率资源进行分配。单一的以行政审批方…     

3G业务各系统间的电磁兼容分析之一WCDMA与WCDMA

0概述 信息产业部无线电管理局已于2002年10月对外公布了<关于第三代公众移动通信系统频率规划问题的通知>(信部无[2002]479号),在该频率规划的方案中,将1920-1980MHz/2000-2170MHz频段作为FDD的主要使用频段,1755-1785MHz/1 850-1 880MHz频段作为FDD的补充工作频段,由WCDMA和CDMA2000共享;1880-1920MHz、2010-2025 MHz频段作为TDD的主要使用频段,2300-2400MHz频段作为TDD的补充工作频段;1980-2010MHz/2170-2200MHz作为卫星移动通信系统工作频段,主要使用频段如图1所示.     

面向5G网络切片无线资源分配

未来网络需要满足多种应用场景在时延、可靠性和速率等方面的不同要求,然而只构建一种网络难以满足所有应用场景的需求.网络切片技术即在一个物理基础设施之上构建多个逻辑网络以满足不同类型应用场景的需求,能够实现专用电信网络所具有的所有功能,且用户感受不到差别.无线接入网切片是端到端网络切片的一部分,而无线资源分配又是无线接入网切片的重要内容.本文提出了一种基于比例公平算法的半静态资源分配方案,在各网络切片之间实现更公平的资源分配.仿真结果对比了三种资源分配方案,半静态资源分配方案获得的公平性优于其他两种资源分配方案.     

Resource allocation for non-real-time services in OFDM-based cognitive radio systems

We study the resource allocation (RA) problem in a multiuser OFDM-based cognitive radio (CR) system for non-realtime (NRT) applications in which average user data rates are to be maintained proportionally. In contrast to existing algorithms designed for multiuser OFDM systems, which are unable to guarantee users proportional rates when applied in a CR system, the proposed optimal RA algorithm ensures that CR user rates are maintained in proportion to predefined target rates while at the same time providing an improved system throughput.     

Proportional-fairness resource allocation for uplink OFDM-based cognitive radio systems

This paper has proposed a proportional-fairness resource allocation algorithm, including both subcarrier assignment algorithm and power allocation algorithm, for uplink orthogonal frequency division multiplexing (OFDM)-based cognitive radio (CR) systems. First, to get a better performance in the proposed system model, the influence factor (a,b,c) was introduced to realize the assignment of the subcarriers. Second, the transmit power of the secondary users (SUs) was allocated to the corresponding subcarriers in order to maximize the uplink capacity of the SUs subject to both power and interference constraints. With the appropriate influence factor in the subcarrier assignment, the loss of transmitted data rate arising from the fairness was minimized. Simulation results showed that the proposed algorithm can achieve a perfect fairness among the SUs while maximizing the system capacity simultaneously, and is of a low computation complexity.