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.

Throughput and buffer analysis for GSM General Packet Radio Service (GPRS)

Abstract: The Global System for Mobile Communications (GSM) Phase 2+ standard specifies a new type of packet data service called General Packet Radio Service (GPRS). GPRS allows the dynamic allocation of bandwidth resources. Wireless channels are allocated to a mobile terminal based on its traffic demands. This results in better resource utilization compared to the circuit-based data services. In general, packet-based communication has more bursty traffic and longer connection time compared to its circuit-based counterpart. A communication session may last for an extended period of time with intermittent packet transmissions. This traffic behavior coupled with flexible bandwidth allocation in a GPRS network results in multiplexing gain that is not available in circuit switched data networks. This paper evaluates the throughput and buffer utilization in a GPRS network under Internet traffic models, such as WWW and E-mail. The performance of GPRS is then compared with the circuit based GSM network to demonstrate the improvement due to multiplexing gain.

Energy efficient hybrid satellite terrestrial 5G networks with software defined features

Abstract: In order to improve the manageability and adaptability of future 5G wireless networks, the software orchestration mechanism, named software defined networking (SDN) with control and user plane (C/U-plane) decoupling, has become one of the most promising key techniques. Based on these features, the hybrid satellite terrestrial network is expected to support flexible and customized resource scheduling for both massive machinetype- communication (MTC) and high-quality multimedia requests while achieving broader global coverage, larger capacity and lower power consumption. In this paper, an end-to-end hybrid satellite terrestrial network is proposed and the performance metrics, e. g., coverage probability, spectral and energy efficiency (SE and EE), are analysed in both sparse networks and ultra-dense networks. The fundamental relationship between SE and EE is investigated, considering the overhead costs, fronthaul of the gateway (GW), density of small cells (SCs) and multiple quality-ofservice (QoS) requirements. Numerical results show that compared with current LTE networks, the hybrid system with C/U split can achieve approximately 40% and 80% EE improvement in sparse and ultra-dense networks respectively, and greatly enhance the coverage. Various resource management schemes, bandwidth allocation methods, and on-off approaches are compared, and the applications of the satellite in future 5G networks with software defined features are proposed.

Distributed channel assignment protocols: a cross-layer approach [wireless ad hoc networks]

Abstract: Despite being the subject of many years of research, distributed channel assignment remains a challenging problem. In this paper, we use a cross-layer approach and present a family of efficient distributed channel assignment protocols for wireless ad hoc networks. These protocols seek to assign distinct channels to each node within all sets of interfering nodes on the same route, subject to a channel availability constraint. Because the proposed protocols combine channel assignment with routing, they exhibit significantly lower communication, computation, and storage complexity than existing channel assignment schemes. We present an example protocol that utilizes the AODV routing protocol. In addition, we prove the correctness of the algorithms and derive an upper bound on the number of channels required to both resolve collisions and mitigate interference. Simulation results show that the performance of the proposed protocols can approach that of centralized near-optimal algorithms when the number of active routes is small.

Energy-efficient resource allocation in wireless OFDMA systems

Abstract: Reducing the consumed energy in wireless communication systems has a direct impact on operational expenditure as well as CO2 emissions With increasing interest in multimedia applications and high data rate services, environmentally sustainable communications networks must reduce the energy per delivered bit at an equal rate, if not better This paper addresses downlink energy-efficient transmission in OFDMA systems and maximizes the overall bits transmitted per joule of energy In addition to the transmit power, circuit power is also accounted for in the energy-efficient design, which is tackled using both standard optimization techniques and a frame work based on time-sharing Simulation results show similar performances for both cases with the latter having lower complexity and taking less CPU time to run

Partially overlapping channel assignment based on “node orthogonality” for 802.11 wireless networks

Abstract: In this study, we investigate the problem of partially overlapping channel assignment to improve the performance of 802.11 wireless networks. We first derive a novel interference model that takes into account both the adjacent channel separation and the physical distance of the two nodes employing adjacent channels. This model defines “node orthogonality”, which states that two nodes over adjacent channels are orthogonal if they are physically sufficiently separated. We propose an approximate algorithm MICA to minimize the total interference for throughput maximization. Extensive simulation study has been performed to validate our design and to compare the performances of our algorithm with those of the state-of-the-art.