Effect of relaying on capacity improvement in wireless local area networks

So, Aaron; Liang, Ben

doi:10.1109/wcnc.2005.1424743

Cited by 46 publications

(32 citation statements)

References 9 publications

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“…In [22], the expected throughput capacity of a wireless network with a single-tier relay infrastructure and the optimal placement of the relay nodes were derived based on the recent information theory results. We have shown in [22] that, under the additive white Gaussian noise channel model and with continuous bit rates, the optimally configured relay infrastructure can improve the throughput of a wireless network significantly.…”

Section: Related Workmentioning

confidence: 99%

“…We have shown in [22] that, under the additive white Gaussian noise channel model and with continuous bit rates, the optimally configured relay infrastructure can improve the throughput of a wireless network significantly. However, because of the finite modulation and coding schemes of modern communications systems, transmitters can only transmit in a finite set of bit rates.…”

Section: Related Workmentioning

confidence: 99%

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Efficient Wireless Extension Point Placement Algorithm in Urban Rectilineal WLANs

Liang

2008

IEEE Trans. Veh. Technol.

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Abstract-With a small amount of software modification, wireless Extension Points (EPs), which are now commercially available, can be used to improve the throughput capacity of a Wireless Local Area Network (WLAN). An EP is an immobile device that has access to the power supply or is equipped with a high capacity battery but does not have direct access to the Internet. They relay data wirelessly between the Access Point (AP) and the mobile hosts. In this paper, we investigate the optimal placement of EPs such that the throughput capacity of an urban rectilineal WLAN can be maximized. Two channel models are studied, based on the Shannon capacity bound and IEEE 802.11 specifications. We first formulate a solution for the optimal EP placement problem in a general network scenario as a non-linear programming problem, then we propose an efficient algorithm that determines the optimal locations of a fixed number of EPs in a rectilineal network. Our results show that, for a wide range of system parameters, the optimally placed EPs can significantly increase the network throughput capacity. Moreover, we study how the number of EPs, transmission power, path loss exponent, channel models and traffic characteristics affect the optimal EP placement and expected throughput capacity of the network.Index Terms-wireless local area networks, access point, extension point, optimal placement, capacity improvement, mathematical programming/optimization.

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Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Efficient Wireless Extension Point Placement Algorithm in Urban Rectilineal WLANs

Liang

2008

IEEE Trans. Veh. Technol.

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“…Second, the fixed relay nodes can be optimally configured to maximize their beneficial effects. The problem of fixed relay placement to maximize WLAN capacity was first studied in [8]. In [9], we proposed an efficient extension point placement algorithm aiming at improving the network layer throughput of a rectilineal network, using a divide-and-conquer searching algorithm.…”

Section: Related Workmentioning

confidence: 99%

“…The expected minimum packet transaction time with this particular placement can be calculated by using (7). This value is an upper bound of (8). The lower bound for the current iteration is simply the objective function (14) with the values of X and Y found in Step 2 [11].…”

Section: An Optimization-based Lagrangian Relaxation Iterative Algorithmmentioning

confidence: 99%

A Lagrangian Approach for the Optimal Placement of Wireless Relay Nodes in Wireless Local Area Networks

Liang

2006

NETWORKING 2006. Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile A

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Abstract. The throughput capacity of WLANs can be improved by a carefully designed relay infrastructure. In this work, we propose an optimization formulation based on Lagrangian relaxation and a subgradient algorithm to compute the best placement of a fixed number of relay nodes (RNs) in a WLAN. We apply this optimization framework to a multi-rate WLAN based on the IEEE 802.11g standard under Rayleigh fading. We then study the expected throughput capacity of a WLAN with relay infrastructure and investigate how the optimal placement of RNs is affected by the number of RNs, path-loss characteristics, and the traffic pattern. Our numerical results show that, in some network scenarios, more than 120% performance gain can be achieved when RNs are strategically installed in the network. Furthermore, we also show that for a wide range of system parameters, optimally placed RNs can significantly increase the network throughput capacity over random placement.

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“…Deploying RNs near the cell edge will help to increase the capacity [3] [4] or, alternatively, to extend the cell coverage area [5] [6]. RNs diverse in functionality and mode of operation.…”

Section: Introductionmentioning

confidence: 99%

Performance of Amplify-and-Forward and Decode-and-Forward Relays in LTE-Advanced

Saleh

Redana

Raaf

et al. 2009

2009 IEEE 70th Vehicular Technology Conference Fall

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Effect of relaying on capacity improvement in wireless local area networks

Cited by 46 publications

References 9 publications

Efficient Wireless Extension Point Placement Algorithm in Urban Rectilineal WLANs

Efficient Wireless Extension Point Placement Algorithm in Urban Rectilineal WLANs

A Lagrangian Approach for the Optimal Placement of Wireless Relay Nodes in Wireless Local Area Networks

Performance of Amplify-and-Forward and Decode-and-Forward Relays in LTE-Advanced

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