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Beyond 3G and 4G wireless promise 'always best connected' as well as new high-rate wireless networks. Since costly earlier generation networks are still useful, load sharing between integrated wireless networks becomes feasible. Studies have shown that load shared networks using common radio resource management (CRRM) techniques are beneficial - with circuit-oriented sessions. Since wireless networks...
IEEE 802.16, known as WiMAX, has received much attention for its capability to support multiple types of applications with diverse QoS requirements. Beyond what the standard has defined, radio resource management (RRM) still remains an open issue. In this paper, we propose a hierarchical downlink resource management framework for OFDMA based WiMAX systems. Our framework consists of a dynamic resource...
An iterative algorithm for the multiuser fair scheduling problem of adaptive OFDMA systems is presented. It uses iterative local search with k-opt switches in the combinatorial solution space. The algorithm can be used with different scheduling criteria like proportional fairness and max-min fairness, both for constant and adaptive allocation of power to subcarriers/resource blocks. The algorithm...
Sensor management deals with the efficient resource allocation to meet mission objectives of the application, air traffic control. A schedule for the sensors is constructed, which simultaneously meets the measurement accuracy and update rate, while minimizing the transmissions from the sensors. Bayesian inference is used to determine management requirements for individual aircraft. Particle swarm...
In this paper, we study the election of multiple leaders for intrusion detection in the presence of selfish nodes in mobile ad hoc networks (MANETs). To balance the resource consumption and prolong the lifetime of all nodes, each cluster should elect a node with the most remaining resources as its leader. However, without incentives for serving others, a node may behave selfishly by lying about its...
This paper presents the design of VoIP optimized packet scheduler and performance simulations for supporting voice services over downlink evolved UTRA. An efficient packet scheduler taking into account the traffic characteristics and adopting optimal resource allocation is proposed. Results are given for different control channel number settings and packet bundling options. Simulation results show...
A utility based resource allocation scheme is investigated for improving system performance of 802.16 OFDMA systems supporting a mix of multi-media traffic types. We show that a utility based approach can improve system capacity over conventional proportional-fair resource allocation schemes through more efficient allocation of only the required resources demanded by the QoS profile of each traffic...
The impact of MIMO systems on common radio resource management (CRRM) in heterogeneous cellular networks is analysed, by taking some key performance indicators (KPIs) into account. A recent method used to integrate MIMO effects/gains into system level simulation is presented. User mobility profiles are mapped onto MIMO terminal capabilities, and their impact is analysed. CRRM algorithms are based...
WLAN mesh networks are often installed to provide wireless coverage for temporary events. In many of these cases, the WLAN mesh nodes can be operated using an energy sustainable source such as solar power. Node resource assignment consists of provisioning each node with a solar panel and battery combination that is sufficient to prevent node outage for the duration of the deployment. In this paper...
IEEE 802.16 Wireless Broadband is a promising technology for providing last mile access. Quality of Service (QoS) is an important factor that has been addressed by the standard which defines four types of multimedia traffic classes. However resource allocation and scheduling between the traffic classes is vital in providing QoS which the standard has left undefined. In this paper we propose a Markov...
In IEEE 802.16 uplinks, the permutation of data on a frequency domain is performed when logical subchannels are transformed to physical subchannels to scatter deterioration of the radio propagation environment via inter-cell interference. However, it is ideal from the viewpoint of evading interference to completely divide the radio resource between the interfering cells, when there is comparatively...
In this paper, we propose cooperative division relay- based allocation technique jointly with adaptive bit/power loading for multiple-input-multiple-output/orthogonal frequency division multiplexing (MIMO/OFDM) system. In this cooperative division technique, the transmitted stream of bits is divided into two parts. The first part is sent directly from the source to the destination, whereas the second...
Various characteristics of applications determine different requirements of mobility management schemes. Realtime applications especially lay strict limitation on handoff latency and latency stretch. This limitation is exacerbated when system robust, scalability and load balancing are required simultaneously. In this paper, we present a peer-to-peer based mobility support scheme that keeps advantages...
In future cellular networks, random users' mobility as well as time-varying multimedia traffic activity make cellular networks design a challenging task. To efficiently utilize the limited wireless spectrum, it is crucial to enable cellular systems to reactively and dynamically reconfigure cells' service area and capacity. This paper proposes an effective dynamic directional cell coverage adaptation...
This paper provides analytical expressions to evaluate the performance of a random access wireless network in terms of user throughput and network throughput, subject to the constraint of proportional fairness amongst users. The proportional fair scheduling (PFS) algorithm is considered an attractive bandwidth allocation criterion in wireless networks for supporting high resource utilization while...
We consider the problem of scheduling multiple transmissions on the downlink of a wireless network with probabilistic guarantees on users' short-term average throughputs. Many interactive data applications have some degree of a latency requirement, and measure performance by average throughput over a relatively short time interval. We refer to the fraction of time that the transmission rate of a user...
In this paper, dynamic resource allocation problems for multi-user downlink MIMO-OFDMA are investigated. With the goal of minimizing the total transmit power under condition that QoS of different users can be guaranteed, a novel dynamic resource allocation algorithm is proposed. First of all, a new subcarrier allocation policy is given based on the perfect CSI. And then a spatial subchannels grouping...
Channel-dependent scheduling (CDS) can increase the data throughput of a cellular system by exploiting multi-user diversity and frequency selectivity in the channel. In this paper, we investigate the impact of imperfect channel state information (CSI) on CDS. Specifically, we analyze the data throughput of an uplink single carrier FDMA (SC-FDMA) system with uncoded adaptive modulation and CDS when...
We consider a multi-cell wireless network with a large number of users. Each user selfishly chooses the Base Station (BS) that gives it the best throughput (utility), and each BS allocates its resource by some simple scheduling policy. First we consider two cases: (1) BS allocates the same time to its users; (2) BS allocates the same throughput to its users. It turns out that, combined with users'...
This paper presents an AP selection strategy in the office environment covered by WLAN. While most of the selection metrics balances the active load among neighboring BSSs, the quality of voice applications greatly depends on the call blocking probability which is decided by all the potential voice STAs. For this reason, we define a QoS-aware information element that is advertised from APs. On this...
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