Topic
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.
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01 Jan 2003TL;DR: In this article, a semi-distributed OFDMA radio resource control (RRC) scheme where dynamic resource allocation is realized at both a radio network controller (RNC) and base stations (BTSs) is presented.
Abstract: This paper presents an OFDMA radio resource control (RRC) scheme where dynamic resource allocation is realized at both a radio network controller (RNC) and base stations (BTSs). The scheme is semi-distributed in the sense that the RNC coordinates the mutual interference (inter-cell) at a super-frame level, whereas each BTS makes faster frame-level channel assignment decision based on resources' utility value to users. Another contribution of the paper is a set of computationally efficient algorithms that perform dynamic channel allocation at RNC and BTSs. Simulations show that the algorithm yields excellent performance for both real-time and non real-time services, even under very fast fading.
111 citations
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TL;DR: It is shown that dynamic load balancing and sharing capabilities of iCAR systems are strictly dependent on the availability of the ISM-band relay channels, and a simple channel assignment scheme to reduce the performance degradation due to other users' interference is provided.
Abstract: The capacity of wireless networks can be increased via dynamic load balancing/sharing by employing overlay networks on top of the existing cellular networks. One such recently proposed system is the integrated cellular and ad hoc relay (iCAR) system, where an overlay ad hoc network is employed to use the resources efficiently by dynamically balancing the load of the hot spots in the cellular network, and to provide quality-of-service to subscribers, no matter where they are located and when the request is made. It is assumed that this overlay network operates in the 2.4-GHz Industrial, Scientific, and Medical (ISM) band and, hence, the number of available ISM-band relay channels used for load balancing will be limited due to other users' interference at a given point in time. In this paper, the impact of ISM-band interference on the performance of iCAR systems, which is a representative hybrid wireless network, is studied, and it is shown that dynamic load balancing and sharing capabilities of iCAR systems are strictly dependent on the availability of the ISM-band relay channels. In addition to quantifying the impact of the number of available relay channels on the performance of iCAR systems, a simple channel assignment scheme to reduce the performance degradation due to other users' interference is also provided. Results show that this interference avoidance technique can improve the realistic performance of iCAR-like hybrid wireless networks by 12%-23% when the interferers are uniformly distributed in the ISM-band.
110 citations
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TL;DR: A new distortion-minimized bit allocation scheme with hybrid unequal error protection (UEP) and delay-constrained automatic repeat request (ARQ) is proposed, which dynamically adapts to the estimated time-varying network conditions.
Abstract: The paper addresses the important issues of resource allocation for scalable video transmission over third generation (3G) wireless networks. By taking the time-varying wireless channel/network condition and scalable video codec characteristic into account, we allocate resources between source and channel coders based on the minimum-distortion or minimum-power consumption criterion. Specifically, we first present how to estimate the time-varying wireless channel/network condition through measurements of throughput and error rate in a 3G wireless network. Then, we propose a new distortion-minimized bit allocation scheme with hybrid unequal error protection (UEP) and delay-constrained automatic repeat request (ARQ), which dynamically adapts to the estimated time-varying network conditions. Furthermore, a novel power-minimized bit allocation scheme with channel-adaptive hybrid UEP and delay-constrained ARQ is proposed for mobile devices. In our proposed distortion/power-minimized bit-allocation scheme, bits are optimally distributed among source coding, forward error correction, and ARQ according to the varying channel/network condition. Simulation and analysis are performed using a progressive fine granularity scalability video codec. The simulation results show that our proposed schemes can significantly improve the reconstructed video quality under the same network conditions.
110 citations
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NEC1
TL;DR: A simple, decentralized procedure for adaptive channel allocation, autonomous reuse partitioning (ARP), is proposed, which doubles traffic handling capacity and decreases the probability of interference by 1/4 and improves traffic handlingcapacity at the cost of CIR margin in each channel.
Abstract: A simple, decentralized procedure for adaptive channel allocation, autonomous reuse partitioning (ARP), is proposed. Radio channels are viewed in the same order at any base station, and the first channel that satisfies a carrier-to-interference ratio (CIR) threshold is allocated. ARP easily achieves reuse partitioning, in which channels higher in the order are reused at shorter distance by mobile stations from which stronger signal levels are received. An efficient frequency reuse pattern helps ARP to improve traffic handling capacity while avoiding interference. Performance was evaluated by means of computer simulation in which a system accommodating portable units with 70 channels is assumed. Compared with random channel allocation, ARP doubles traffic handling capacity and decreases the probability of interference by 1/4. Actual transmitter power control is shown to improve capacity by 9%. ARP improves traffic handling capacity at the cost of CIR margin in each channel. This can create problems for mobile stations, such as car-mounted units, which suffer rapid fluctuation in signal levels. >
109 citations
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28 Jan 2010TL;DR: In this paper, an access point for a wireless network broadcasting a list of unused channels that are available for communication within the area served by the access point, the various access terminals within this service area receive the broadcast and measure various interference characteristics of each of the channels in the list.
Abstract: Multichannel dynamic frequency selection in wireless networks begins with an access point for a wireless network broadcasting a list of unused channels that are available for communication within the area served by the access point. The various access terminals within this service area receive the broadcast and measure various interference characteristics of each of the channels in the list. The access terminals then send this interference information to the access point, which compiles a matrix of interference information that is associated with the quality of each signal as related to each access terminal. Using this information, the access point selects the appropriate channels to serve the most number of access terminals at the highest possible channel qualities.
109 citations