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.

Utility-oriented adaptive QoS and bandwidth allocation in wireless networks

Abstract: In this paper we propose a general utility-oriented adaptive quality of service (QoS) model for wireless networks and establish a framework for formulating the bandwidth allocation problem for users with time-varying links. For slow link variations, it is inadequate to only employ low-level adaptive mechanisms at the symbol or packet level, such as error correction coding or swapping packet transmission opportunities. To improve bandwidth utilization and satisfy users' QoS requirements, high-level adaptive mechanisms working at larger time scale are needed. We propose an adaptive bandwidth allocation scheme, which is capable of providing QoS guarantees, ensuring long-term fairness, and achieving high bandwidth utilization. A finite-state Markov channel model (FSMC) is used to model wireless links.

Exploiting spatial reuse gain through joint mode selection and resource allocation for underlay device-to-device communications

Abstract: Device-to-device (D2D) communication has recently emerged as a promising technique for improving the performance of next-generation cellular systems. In particular, traffic offloading through exploiting spatial reuse gain of underlay D2D communication has gained attention in the literature. While related work has considered the scenario where at most one underlay D2D pair can share the radio resource of cellular users, we consider in this paper a more general scenario involving multiple D2D pairs for resource sharing. To investigate the resultant performance gain, we first formulate a joint optimization problem for mode selection and resource allocation, where the optimal mode to operate, radio resources to use, and power to transmit are to be optimally decided for a group of users with intra-cell traffic. The formulated problem belongs to MINLP, and hence we propose an algorithm with reduced complexity for solving the problem. Evaluation results show that, through joint mode selection and resource allocation among multiple D2D pairs, the potential of D2D communications can be further exploited for achieving significant performance gain.

Improving the Channel Utilization of IEEE 802.11p/1609 Networks

Abstract: The IEEE 802.11p/1609 standards specify a suite of communication protocols for vehicular communication networks. A new operational mode, called theWAVE (Wireless Access in Vehicular Environments) mode, is defined to enable communication among high-speed vehicles or between a vehicle and a roadside infrastructure network. In the WAVE mode, a mobile/stationary station uses a combined FDMA/TDMA channel access scheme to switch its channel between the control channel and a service channel every 50 ms. The primary purpose of this design is to detect new services announced by other stations. However, if a station would like to use all of its service channel bandwidth to transmit a large volume of data to another station, switching back to the control channel every 50 ms without doing anything useful only unnecessarily reduces the maximum possible transmission throughput by a half. To overcome this problem, in this paper we propose an improved channel access scheme to allow a station to stay on a service channel as long as it requires before returning to the control channel. Our simulation results show that the proposed scheme significantly improves the service channel utilization under various network conditions.

A study on channel allocation for data dissemination in mobile computing environments

Abstract: This paper studies channel allocation methods for data dissemination through broadcast and on-demand channels. Analytical models and cost formulae for exclusive broadcast channels and exclusive on-demand channels are provided. Based on the models, we further derive cost models for dynamic channel allocation methods and propose a channel adaptation algorithm for optimizing system performance. The channel adaptation algorithm can be executed in O(n) time, where n is the number of data items in the database. Performance evaluation shows that the channel allocation algorithm produces optimal channel allocation which significantly improves the system performance under various parameter settings.

Method for channel allocation utilizing power restrictions

Abstract: In channel allocation, the objective is to allocate channels to desired connections using the available frequency spectrum as effectively as possible so that the connections will not cause excessive interference to each other. This invention presents a method based on time blocking of transmission in connections using different transmission powers, in order to further improve the allocation of channels.