Channel allocation schemes

About: Channel allocation schemes is a research topic. Over the lifetime, 10656 publications have been published within this topic receiving 182117 citations.

Joint Base-Station Association, Channel Assignment, Beamforming and Power Control in Heterogeneous Networks

Abstract: Heterogeneous cellular networks (HetNets), where low-power base-stations are overlaid with conventional macro base-stations, is a promising technique to improve coverage and capacity of the macro-only networks. To realize the potential benefits of HetNets, it is crucial to jointly optimize the user association, channel assignment, beamforming and power control to ensure that the inter- and intra-cell interference will not overwhelm the cell-splitting gains. This paper presents an iterative algorithm to solve the joint optimization problem with an objective of maximizing the network sum rate and simultaneously guaranteeing the individual user quality-of-service. The proposed algorithm is built on the so-called convex-concave procedure, and the feasibility issue is handled by L1-norm heuristic. Numerical results demonstrate the large gains over currently used methods for cellular networks.

Cellular vs. Network MIMO: A comparison including the channel state information overhead

Abstract: Cooperative base-station (BS) signaling using MU-MIMO (Network MIMO) has received a great deal of attention given its ability to reduce inter-cell interference (ICI) and improve the system spectral efficiency. Indeed for a given number of antennas per BS, cooperative systems can have significant benefits over conventional cellular architectures. However cooperative signaling requires and uses more channel state information (CSI). This increases CSI signaling overhead, and can have a non-negligible effect on the system throughput. In fact once systems are compared while taking into account CSI overhead, the question of what system architecture is best becomes interesting and non-trivial. We provide one such alternative look at cooperative architectures. We show, despite prevailing views, that cellular architectures, using coordinated colocated antennas, can be quite attractive compared to Network MIMO.

A statistical bandwidth allocation and usage monitoring algorithm for ATM networks

Abstract: A load control method and load monitor function are proposed for continuous bit-rate-oriented (CBO) and variable bit-rate (VBR) services in asynchronous transfer mode networks. The allocation algorithm features low complexity and optimizes quality of service and statistical multiplexing gain for variable bit-rate sources. The need to implement a monitor function to verify the assumptions made by the load control is demonstrated. Every single connection is monitored and the negative cumulative distribution of the cell rate compared with an envelope. The load monitor function ensures the proper functioning of the load control mechanisms under all input conditions. >

Virtual circuit network dynamic channel management

Abstract: A method and system of managing virtual circuits for improved non-blocking fault tolerance in a multi-node virtual circuit network of resources is presented. On receiving a request for connection between two nodes in the multi-node network, a virtual circuit with a plurality of virtual circuit channels is set up between the two nodes. Each node may have more than one physical link equipped to it. Furthermore, the virtual circuit channel may be disconnected when there is no traffic between the nodes. A method for handling virtual circuit channel allocation and de-allocation that prevents conflicts in reuse of the channels before they are released by both nodes in the connection is also presented. A protocol to prevent race conditions between the nodes is also established providing improved bandwidth utilization in the multi-node network.

Real-time link quality estimation for industrial wireless sensor networks using dedicated nodes

Abstract: Adaptive mechanisms, such as dynamic channel allocation or adaptive routing, are used to deal with the variations in the link quality of Wireless Sensor Networks (WSN). In both cases, the first step is to estimate the link quality, so that the network nodes can decide if a channel or route change is needed. This paper proposes a Link Quality Estimator (LQE) for Industrial WSN, and a new type of node, the LQE node, that estimates the link quality in real-time, using the Received Signal Strength Indication (RSSI), and information obtained from received data packets. The proposed LQE is capable of capturing the effects of multipath, interference, and link asymmetry. Experiments were performed in a real industrial environment using IEEE 802.15.4 radios, and models were developed to allow the use of RSSI samples to proper estimate the link quality. A comparison was performed with a state-of-the-art LQE, the Opt-FLQE, and the results showed that the proposed estimator is more accurate and reactive for the type of environment in study. Different from other LQEs in literature, in the proposed LQE the sensor nodes do not need to send broadcast probe packets. Besides, using the LQE node, the other nodes of the WSN do not need to stop their operation to monitor the link quality.