Performance analysis of transparent relays in 802.16j MMR networks

Genc, Vasken; Murphy, Siobhan; Murphy, John

doi:10.1109/wiopt.2008.4586077

Cited by 25 publications

(18 citation statements)

References 6 publications

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“…By not taking one of the methods into progress, we have been able to observe the improvement and the effects of each method on system performance. It is depicted [5] that, the system throughput increase stabilizes when 4 relay nodes are deployed. Thus, before investigating all the results evaluated for a range of all N values, we focus on an example of results evaluated for totally N=6 nodes including the transmitter and the receiver [11].…”

Section: Resultsmentioning

confidence: 96%

“…Most of the works in the literature attempt to improve the system throughput by trying to cooperate the primary (licensed) users and secondary (unlicensed) users for efficient resource allocation [3,4]. However, there are only little research works specifically on multi-hop 802.16j networks at present [5] that try to improve the throughput with design of WIMAX relay based system. In [3], the authors propose a novel method for flexible channel cooperation which allows secondary users to freely optimize the use of channels for transmitting primary data along with their own data in order to maximize the throughput performance.…”

Section: Introductionmentioning

confidence: 99%

“…In [5], a study of the performance of transparent mode relay-based 802.16j systems is described and design of WIMAX relay-based system is considered. However effects of routing algorithms and effects of vehicular velocities are not considered in this work and only 5% throughput improvement is provided with almost twice signaling overhead where we have provided the throughput improvement for different number of nodes (N) in a range between 15% (for N=24) and 36% (for N=4) as seen in Fig.5.…”

Section: Introductionmentioning

confidence: 99%

“…However effects of routing algorithms and effects of vehicular velocities are not considered in this work and only 5% throughput improvement is provided with almost twice signaling overhead where we have provided the throughput improvement for different number of nodes (N) in a range between 15% (for N=24) and 36% (for N=4) as seen in Fig.5. According to authors [5], the work already demonstrates the necessity of finding other ways to improve 802.16j network throughput performance.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of Novel Long Life Routing Algorithms on IEEE 802.16 Throughput Improvement Methods for Various Vehicular Velocities

Preveze

2012

IJWMN

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In this paper, effects of Fastest Path Routing, Ant-Colony Routing, Associativity Based Routing (ABR) and other novel proposed Associativity Based Long Life Routing algorithms, on novel proposed throughput improvement algorithm Most Congested Access First (MCAF), minimizing the packet loss ratio and improving the throughput of a multi-hop mobile WIMAX network are investigated for various vehicular velocities. The proposed Long Life Routing algorithms are shown to provide more throughput improvement for all vehicular velocities and provide longer life routes.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Novel Long Life Routing Algorithms on IEEE 802.16 Throughput Improvement Methods for Various Vehicular Velocities

Preveze

2012

IJWMN

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“…One or more RS are involved to establish the connectivity between BS and MS, and the network follows either tree mode architecture. Nevertheless, relay based multihop WiMAX networks are envisioned as a promising solution for coverage extension, coverage hole, shadowing, and throughput enhancement [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Mutual Contention Bandwidth Request Mechanisms in Two-Hop Relay Network with ITU-R Path Loss Models

Anbazhagan

Nakkeeran

2013

ISRN Communications and Networking

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The performance of two-hop contention based bandwidth request (BR) mechanism for WiMAX relay networks is investigated under ITU-R path loss models. In conventional WiMAX systems, the mobile stations (MS) update their contention window irrespective of their transmission failures. Those systems update their contention window on collision and due to channel error or unavailability of bandwidth. Further, these failure models have been suggested for single hop networks. The failure model in two-hop systems becomes complex since it may include additional failure events such as improper detection of codes and channel error due to varying path loss. Interestingly, these failure events (collision, channel error, unavailability of bandwidth, and improper detection of codes) do not occur evenly for both hops of a link. Hence, to set the contention window effectively, unique failure models are developed by considering the characteristics of BR mechanism and hop at which the BR is performed. In the proposed system, the two-hop BR is carried out with all combinations of message and code bandwidth request schemes. Among them, the messagecode BR mechanism performs better under suburban fixed and outdoor to indoor or pedestrian environment, and code-code BR scheme performs better for vehicular environment.

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Evaluating frame structure design in WiMAX relay networks

Taha

Kolomitro

Hassanein

et al. 2011

Concurrency and Computation

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SUMMARYThis paper evaluates the effect of the choice of frame structure type in WiMAX networks employing non‐transparent relay stations (ntRS). The IEEE 802.16j‐2009 amendment allows two frame structure types, single frame and multiframe. Thus far, a comparison of the two choices, in terms of network performance, has not been made. To facilitate this evaluation, we expanded on light WiMAX ns2 add‐on to support ntRS, the two‐frame structure types, in addition to the relevant operational requirements (e.g. QoS support). We observed that whereas the multi‐frame structure allows for higher throughput and voice capacities, the single frame shows some general advantage in terms of delay. A serious need exists, however, for schedulers that exploit the advantages of a dynamic multi‐frame structure in order to realize its full potential. Copyright © 2011 John Wiley & Sons, Ltd.

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Performance analysis of transparent relays in 802.16j MMR networks

Cited by 25 publications

References 6 publications

Effects of Novel Long Life Routing Algorithms on IEEE 802.16 Throughput Improvement Methods for Various Vehicular Velocities

Effects of Novel Long Life Routing Algorithms on IEEE 802.16 Throughput Improvement Methods for Various Vehicular Velocities

Investigation on Mutual Contention Bandwidth Request Mechanisms in Two-Hop Relay Network with ITU-R Path Loss Models

Evaluating frame structure design in WiMAX relay networks

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