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.

Channel allocation methods in a communication network and corresponding system

Abstract: The invention relates to a resource allocation method and system making use of a dynamically controlled boundary policy to satisfy the quality of service parameters guaranteed by the system for two traffic classes (a constant bit rate traffic, and a bursty data one also called VBR traffic) having to share a communication channel divided into frames. The boundary position (BP) between the traffic sub-frames and hence the allocation decision itself are defined by a resource allocator (23) for each frame, after monitoring the filling level of traffic request queues (21, 22). Application: satellite network for broadband communications.

Performance analysis of a dual-threshold reservation (DTR) scheme for voice/data integrated mobile wireless networks

Abstract: The emerging next generation of wireless cellular networks has to provide the quality-of-service (QoS) for a variety of applications. This paper addresses bandwidth allocation for a voice and data integrated mobile wireless network. Specifically, we propose a new bandwidth allocation scheme called dual-threshold reservation (DTR) scheme, which is a natural extension from well-known guarded channel (GC) scheme used in cellular networks supporting voice traffic. The basic idea is to use two thresholds, one for reserving channels for voice handoff, while the other is used to block data traffic into the network in order to preserve the voice performance in terms of handoff dropping and call blocking probabilities. We develop an analytical model which can obtain its performance using an iterative technique. Results obtained from the analytical model are used to illustrate the system tradeoff.

Minimum Latency Broadcasting in Multiradio, Multichannel, Multirate Wireless Meshes

Abstract: This paper addresses the problem of "efficientrdquo broadcast in a multiradio, multichannel, multirate wireless mesh network (MR2-MC WMN). In such an MR2-MC WMN, nodes are equipped with multiple radio interfaces, tuned to orthogonal channels, that can dynamically adjust their transmission rate by choosing a modulation scheme appropriate for the channel conditions. We choose "broadcast latency,rdquo defined as the maximum delay between a packet's network-wide broadcast at the source and its eventual reception at all network nodes, as the ldquoefficiencyrdquo metric of broadcast performance. We study in this paper how the availability of multirate transmission capability and multiple radio interfaces tuned to orthogonal channels in MR2-MC WMN nodes can be exploited, in addition to the medium's ldquowireless broadcast advantagerdquo (WBA), to improve the ldquobroadcast latencyrdquo performance. In this paper, we present four heuristic solutions to our considered problem. We present detailed simulation results for these algorithms for an idealized scheduler, as well as for a practical 802.11-based scheduler. We also study the effect of channel assignment on broadcast performance and show that channel assignment can affect the broadcast performance substantially. More importantly, we show that a channel assignment that performs well for unicast does not necessarily perform well for broadcast/multicast.

Performance Analysis of Wireless Energy Harvesting Cognitive Radio Networks Under Smart Jamming Attacks

Abstract: In cognitive radio networks with wireless energy harvesting, secondary users are able to harvest energy from a wireless power source and then use the harvested energy to transmit data opportunistically on an idle channel allocated to primary users. Such networks have become more common due to pervasiveness of wireless charging, improving the performance of the secondary users. However, in such networks, the secondary users can be vulnerable to jamming attacks by malicious users who can also harvest wireless energy to launch the attacks. In this paper, we first formulate the throughput optimization problem for a secondary user under the attacks by jammers as a Markov decision process (MDP). We then introduce a new solution based on the deception tactic to deal with smart jamming attacks. Furthermore, we propose a learning algorithm for the secondary user to find an optimal transmission policy and extend to the case with multiple secondary users in the same environment. Through the simulations, we demonstrate that the proposed learning algorithms can effectively reduce adverse effects from smart jammers even when they use different attack strategies.

Sub-channel allocation in orthogonal frequency division multiplex wlan

Abstract: A method for simultaneous communication with multiple communication devices in a wireless local area network is described. Respective sub-channels of an orthogonal frequency division multiplexing (OFDM) communication channel are allocated to two or more second communication devices for simultaneous OFDM transmission to the two or more second communication devices, including allocating first and second sub-channels to first and second ones of the two or more second communication devices, respectively. Respective downlink OFDM data units are generated using the corresponding allocated sub-channels. The downlink OFDM data units are transmitted using the corresponding allocated sub-channels. At least first and second uplink OFDM data units transmitted by the respective second communication device in response to the corresponding downlink OFDM data unit are received. The first and second uplink OFDM data units are transmitted from the respective second communication device via the corresponding allocated sub-channel.