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This paper proposes a novel admission control (AC) algorithm for guaranteed quality of service (QoS) to all users. The proposed solution provides better utilization of system capacity using adaptive modulation (AM). A scheduler based on a per user priority function is also given in this paper. The AC is given by allocating the exact number of slots for each user that will meet its QoS. For every new...
Cross-layer algorithms that jointly allocate resources at different layers are known to foster the communication performance in wireless networks. Recent works have shown that fading and queue information are among the most critical parameters to consider in cross-layer designs. Motivated by those findings, this work develops optimal algorithms that use instantaneous fading and queue length information...
To achieve multiuser diversity gains, resource allocation relies on accurate and timely feedback of the users' channel states. This feedback suffers from transmission errors and delay which can heavily degrade the sum capacity of a scheduled multiuser downlink. The order of this capacity loss and its interdependency to relevant scenario factors is characterized in this paper. From studying a simple...
We propose a new channel rate and queue state adaptive time resource allocation heuristic for the base stations in a multiuser wireless access scenario. Motivation of the scheme is derived through the effective capacity concept. Our proposed strategy accounts for fairness and quality-of-service (QoS) of the system on per frame basis. Our results show that the proposed scheme benefits the users with...
We propose a game-theoretic framework for quality-of-service (QoS) aware resource competition among coexisting wireless links in mobile wireless networks. The senders of wireless links use the constant transmit power and then the wireless resources of interest is characterized by time-slot length. Multiple wireless links will use the limited wireless resources through a time-slot competition game...
In this paper, a new packet approximation algorithm based on WF2Q+ of TGPS (T-WF2Q+) has been proposed in multicast orthogonal frequency division multiplexing (OFDM) systems. By using Lambda(t) instead of Lambda, the TGPS scheme could preserve the service guarantees provided by WF2Q+ algorithm for enabling to support the OFDM wireless dynamic communication systems. The proposed resource management...
Distributed Cooperative Cyclic Delay Diversity (DCCDD) multi-hop relay network is shown to yield superior performance over traditional link network. The benefits provided by increased frequency selectivity caused by the cyclic delays are evaluated through the explicit closed-form BER expressions and maximum achievable throughput [bits/s/Hz]. Towards that end resource allocation strategies in terms...
In the OFDMA downlink, obtaining channel state information (CSI) from users is necessary for the base station (BS) to optimize network performance by intelligently allocating resources and scheduling mobile stations (MS). However, the overhead of obtaining CSI is a large burden and therefore, schemes to reduce CSI are necessary for a realizable system. By considering a MS's coherence time Deltatcoh...
Dynamic allocation of power, rate and channel access is a critical task in wireless networks. Capitalizing on convex optimization and stochastic approximation tools, this paper develops a stochastic resource allocation algorithm that minimizes average transmit power under individual average rate constraints. Focus is placed on networks where users transmit orthogonally over a set of parallel channels...
In this paper, we propose signal strength ratio (SSR) based handoff algorithms for cellular networks. Conventional handoff algorithms use averaging method to minimize fluctuations of received signal strength at a mobile station (MS). The algorithm provides good performance under dynamic propagation environment and provides very less delay as averaging of signal strength is not done. Performance of...
In this paper we analyze the delay performance of a single user with perfect channel state information transmitting data over a wireless fading channel. We consider a dynamic resource allocation policy that maximizes average capacity by adapting transmission power, as well as a policy that adapts instantaneous bandwidth. Nakagami fading is assumed, and the impact of the fading parameter, m, as well...
In this paper, we explore the applicability of a well known biological modeling technique to the problem of studying dynamic resource allocation in wireless networks. We utilize a variant of Kauffman's NK model for epistatic evolution, where epistasis is taken to be a measure of the degree to which network links share a common resource, for example time or bandwidth. In our model, alleles correspond...
In this paper we study the performance of the heuristic localized gradient algorithm (HLGA) that was designed for uplink scheduling in 3G long term evolution (LTE) systems. The performance of the algorithm is examined when dynamic traffic models are assumed. With dynamic traffic, users will have different buffer occupancies. The amount of resources granted to a user need to be mapped to the size of...
We propose the adaptive resource allocation schemes for multiuser downlink quality-of-service (QoS) provisionings over broadcast fading channels in time-division (TD) based cellular wireless networks. Specifically, we apply the effective capacity theory to control the service rates with the diverse delay QoS requirements for different mobile users. Subject to the proportional- effective-capacity constraint...
A new cross-layer adaptive resource allocation scheme for real-time services is proposed in this paper. Not only the characters such as the random service arrival, limited buffers and QoS requirements are considered at MAC layer, but also the time-varying wireless channel effect. By adaptive processing procedures, it can improve end-to-end system performance effectively. Simulation results show that...
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