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Inter-cell interference (ICI) is responsible for user throughput degradation and especially for users found near cell border which additionally experience serious path-losses. Efficient methods for ICI mitigation are ICI coordination (ICIC) schemes which allocate certain resources among users in different cells. In this paper we propose a decentralized ICIC scheme in order to mitigate the ICI and...
In this paper, we propose a distributed adaptive interference coordination algorithm for a practical orthogonal frequency division multiple access (OFDMA)-based mobile cellular systems. The designed algorithm can achieve an efficient frequency reuse for any user distribution and traffic load. Since no a priori frequency planning is required, the minimal coordination between base stations is also achieved...
In this paper we apply constrained optimization techniques to optimally allocate bandwidth and transmit power to the users in a cellular network. We utilize partial frequency reuse with one user in the full and one user in the partial frequency reuse regions as inter-cell interference mitigation technique. We show that the non-convex sum-rate maximization problem becomes convex under some simplifying...
This paper investigates a new analytical model of a cell supporting adaptive traffic. A dynamic channel allocation scheme based on predefined bandwidth threshold values, which takes into account the signal power of incoming calls, is presented. A threshold value is set to limit the number of new connections to reduce the handoff dropping probability. Formula for performance characteristics e.g. blocking...
In this paper, we propose the Nash bargaining solution for the interference problem in cellular networks. The base-stations of neighboring cells negotiate with each other to determine the best number of channels that should be allocated to their edge users. While cells optimize the allocated resources on a local level, the bargaining process acts as a common framework that combines the optimization...
In the channel assignment problem, frequencies are assigned to requested calls in a cellular mobile network subject to co-channel, adjacent channel and co-site constraints such that required bandwidth is minimized. In this paper, a new hybrid algorithm is proposed to solve the channel assignment problem and Node-color and Node-degree ordering of cells and Row-wise and Column-wise ordering of calls...
This paper proposes a novel Dynamic Priority Time-Threshold-based Queuing bandwidth allocation Scheme for Multimedia services (DPTTQM) in cellular networks. Because future data service will occupy a large portion of all services in next generation mobile networks, there is much significance in improving non-prioritized handoff data call dropping probability of Finite Queuing Adaptive Time-Threshold-based...
As various wireless technologies and application demands for more and more bandwidth, dynamic channel allocation in multiple bands has become an attractive research direction. In this paper, we propose several channel allocation policies for various types of user profiles under various fluctuation traffic loads in dual-band multi-cell environments. The considered policies include 1) fixed allocation...
In the next generation cellular communication environment, the effective delivery of multimedia traffic will become an increasingly important issue. In multimedia cellular networks, we should not only minimize handoff dropping probability, but also control new call blocking probability and utilize bandwidth efficiently. In this paper, a novel preemptive time-threshold based bandwidth allocation scheme(PTTS)...
This paper proposes a dynamic Probabilistic Priority Adaptive Time-Threshold-based bandwidth allocation Scheme for Multimedia services (PPATTSM) in cellular networks. Because future data service will occupy a large portion of all services in next generation mobile networks and forced termination of an ongoing call is clearly less desirable than blocking of a new call attempt, there is much significance...
This paper points out the disadvantage of ATTS scheme in performance of the handoff voice call dropping probabilities and then proposes a novel Improved Adaptive Time-Threshold based bandwidth allocation Scheme (IATTS) for voice calls in cellular wireless networks. In order to decrease the prioritized handoff dropping probability, proposed scheme makes prioritized handoff calls have preemptive priority...
Cognitive radio is thought to be a flexible way to improve the spectrum efficiency. The major challenge is that the communications in the cognitive radio network would be affected by the behaviors of licensed incumbents. The cognitive system must vacate the channel within moving time whenever the licensed incumbents re-occupy that channel, in order to reduce the interference to the licensed system...
Since bandwidth is the most critical resource in mobile cellular networks, it is important to employ mechanisms for efficiently using the available bandwidth. Mobility of users and scarcity of bandwidth makes QoS provisioning a difficult task in cellular networks. In this paper, a call admission control (CAC) and resource reservation mechanism (RR) is described to provide a consistent QoS guarantee...
In order to ensure the quality of broadband service in cellular networks, bandwidth resources are required more and more. But the wireless bandwidth resources in a cell are limited and fixed. A QoS-adaptive bandwidth allocation scheme based on measurement report real-time analysis is presented in the paper. It makes use of the measurement report frames and normalized QoS level to maximize the weight...
In this paper, the analytical modeling of a time-threshold based multi-guard bandwidth allocation scheme is presented using a two-dimensional Markov chain. The main idea of the scheme is based on monitoring the elapsed real time of handoff calls and according to a time threshold (te), a handoff call is either slightly-prioritized or fully-prioritized. A slightly-prioritized handoff call has higher...
In this paper, we propose time slot based bandwidth management in mobile wireless cellular networks along with time split method. Our analytical results have shown that higher priority handover call gets fixed duration time slot and will be maintained constant through out the connection life time. Lower priority handover call gets minimum duration time slot in heavy load conditions and will enjoy...
We derive lower bounds on the bandwidth requirement for feasible channel assignment in a hexagonal cellular network for multimedia communications. An understanding of such bounds would greatly enhance the ability of service providers to offer multimedia based applications over cellular networks. For simplicity, we consider only two types of multimedia signals, with single demand for each type at each...
This paper proposes a novel Adaptive Time-Threshold-based bandwidth allocation Scheme for Multimedia calls (ATTSM) in cellular networks. In proposed scheme, multimedia services include voice and data calls and the bandwidth threshold for non-prioritized handoff multimedia calls and new multimedia calls can be varied adaptively based on handoff and new multimedia call arrival rates. This makes it possible...
Consider the problem of base-station and sub-carrier assignment on the downlink of a two-cell OFDMA system with adaptive modulation. The aim is to maximize a common data rate that can be offered to each user with a guaranteed maximum rate-outage probability. A target bit-error rate is also guaranteed with a maximum outage probability. The channel model takes into account the propagation path-loss...
Multihop relay networks (MR) use relay stations (RS) to extend or enhance the coverage of a base station (BS) in a cellular network. The base station is attached to a wired backhaul. Relay stations use wireless transmission to connect to the base station and to the mobile stations (MS), while direct BS-MS connection is also possible. Low cost relay technologies are recently proposed for OFDM based...
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