A Scheme for Enhancing TCP Fairness and Throughput in IEEE 802.11 WLANs

Lee, Eun-Jong; Lim, Hyung-Taig; Seok, Seung-Joon; Kang, Chul-Hee

doi:10.1007/978-3-540-72606-7_32

Cited by 4 publications

(7 citation statements)

References 6 publications

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“…As the first category of service differentiation or fairness, there are some schemes that directly control TCP congestion window size so as to mitigate the unfairness issue of TCP in IEEE 802.11 MAC protocol [6,7]. Pilosof et al [6] have exhibited that the AP in a Hot Spot network favors uplink TCP flows more than downlink TCP flows and its buffer capacity affects the fairness among stations, and then proposed the solution that the AP directly manipulates the advertised TCP window size included in TCP acknowledgment (ACK) packets passing through it.…”

Section: Service Differentiation In Wlansmentioning

confidence: 99%

“…Pilosof et al [6] have exhibited that the AP in a Hot Spot network favors uplink TCP flows more than downlink TCP flows and its buffer capacity affects the fairness among stations, and then proposed the solution that the AP directly manipulates the advertised TCP window size included in TCP acknowledgment (ACK) packets passing through it. Lee et al have proposed the solution of extending the idea in [6] in the way that AP modifies advertised TCP window size by reflecting a maximally achievable TCP window size into the computation of advertised window size in addition to inspecting current buffer availability [7].…”

Section: Service Differentiation In Wlansmentioning

confidence: 99%

“…Based on the framework, LBS (i) enables users to pinpoint their current position in a new area into which they move or to search geographical information in the position; (ii) personalizes information, contents, or services according to users' interest; (iii) provides a list of local service providers for users according to their location, e.g., private location, home location, or work location, so that they can choose one of them giving most economic rate for voice or data service, i.e., at rate, special, and discount rate; (iv) assists users to determine most appropriate communication access technology, such as cellular, WiFi, WiMAX, or BlueTooth; (v) identifies emergent events or users in danger or disseminates crucial events to all the people in the proximity and then provides the relevant safety services and information; (vi) provides privileged access to keep track of friends, family members, or employees moving in a fleet. Considering LBSs directly use location information and also require different levels of quality of services (QoS), we need to use the location information in LBS frameworks in order to provide QoS for LBSs, instead of just resorting to any existing per-flow or per-station QoS-provisioning scheme [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enabling location-aware quality-controlled access in wireless networks

Kim

Lee

et al. 2011

J Wireless Com Network

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Location-based services (LBSs), such as location-specific contents-providing services, presence services, and E-911 locating services, have recently been drawing much attention in wireless network community. Since LBSs rely on the location information in providing services and enhancing their service quality, we need to devise a framework of directly using the location information to provide a different level of service differentiation and/or fairness for them. In this paper, we investigate how to use location information for QoS provisioning in IEEE 802.11-based Hot Spot networks. Location-based service differentiation is different from existing QoS schemes in that it assigns different priority levels to different locations rather than flows or stations and schedules network resources to support the prioritized service levels. In order to realize such the location-based service differentiation, we introduce the concept of per-location target load to simply represent the desirable rate of traffic imposed to the network, which is dynamically changing due to the number of stations. The load consists of per-location load, which directly quantifies per-location usage of link capacity, and network-wide load, which indirectly calibrates the portion of per-location load contributed to the network-wide traffic. We then propose a feedback framework of provisioning service differentiation and/or fairness according to per-location target load. In the proposed framework, the load information is feedback to traffic senders and used to adjust their sending rate, so that per-location load does not deviate from a given per-location share of wireless link capacity and lays only tolerable traffic on the network in cooperation with other locations. We finally implemented the proposed framework in ns-2 simulator and conducted an extensive set of simulation study so as to evaluate its performance and effectiveness. The simulation results indicate that the proposed framework provides location-based service differentiation and/or fairness in IEEE 802.11 Hot Spot networks, regardless of the number of stations in a location, traffic types, or station mobility.

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Section: Service Differentiation In Wlansmentioning

confidence: 99%

Section: Service Differentiation In Wlansmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enabling location-aware quality-controlled access in wireless networks

Kim

Lee

et al. 2011

J Wireless Com Network

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“…Also, the approach in [20] allows the AP to transmit multiple frames in a burst, and the burst size is adjusted based on the collision probability that is monitored in the AP to maximize the wireless link utilization and provide fairness between the uplink and downlink data flows. A transport-layer solution [1], [21] can mitigate the TCP unfairness in the IEEE 802.11 MAC. In [1], it has been pointed out that the TCP fairness is affected by the buffer availability at the AP.…”

Section: Related Workmentioning

confidence: 99%

Provisioning QoS for WiFi-enabled Portable Devices in Home Networks

Park

Kwak

Lee³

et al. 2011

KSII TIIS

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Wi-Fi-enabled portable devices have recently been introduced into the consumer electronics market. These devices download or upload content, from or to a host machine, such as a personal computer, a laptop, a home gateway, or a media server. This paper investigates the fairness among multiple Wi-Fi-enabled portable devices in a home network when they are simultaneously communicated with the host machine. First, we present that, a simple IEEE 802.11-based home network suffers from unfairness, and the fairness is exaggerated by the wireless link errors. This unfairness is due to the asymmetric response of the TCP to data-packet loss and to acknowledgment-packet loss, and the wireless link errors that occur in the proximity of any node; the errors affect other wireless devices through the interaction at the interface queue of the home gateway. We propose a QoS-provisioning framework in order to achieve per-device fairness and service differentiation. For this purpose, we introduce the medium access price, which denotes an aggregate value of network-wide traffic load, per-device link usage, and per-device link error rate. We implemented the proposed framework in the ns-2 simulator, and carried out a simulation study to evaluate its performance with respect to fairness, service differentiation, loss and delay. The simulation results indicate that the proposed method enforces the per-device fairness, regardless of the number of devices present and regardless of the level of wireless link errors; furthermore it achieves high link utilization with only a small amount of frame losses.

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“…Based on pilosof's work, Lee et al [11] improved both the TCP fairness and total throughput. Their solution is to modify the receiver window size on the basis of the maximum window size which is able to maximize the link utilization instead of the AP buffer size.…”

Section: Related Workmentioning

confidence: 99%

Weighted Window and Class-Based Weighted Window Methods for Per-Station TCP Fairness in IEEE 802.11 WLANs

Seyedzadegan

Othman

2010

J Wireless Com Network

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TCP unfairness problem in access networks using the 802.11 has been studied by many researchers. Their solutions required that the existing MAC protocol be modified. However, since they did not consider the case when each wireless node has a different number of flows, they cannot provide fairness among wireless nodes having different numbers of flow in both directions. In order to resolve this problem, Weighted Window and Class-Based Weighted Window methods are proposed. In the Weighted Window method, each wireless node can control the rate of TCP flows based on TCP window size. By applying this method, per-station fairness can be achieved, regardless of the number and direction of flows in each wireless node. Furthermore, to improve and to provide fair bandwidth allocation in the Weighted Window method when the users have different requirements, the Class-Based Weighted Window method is proposed. Therefore, for wireless nodes with different requirements, fair allocation bandwidth between wireless nodes in the same class of bandwidth is achieved.

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A Scheme for Enhancing TCP Fairness and Throughput in IEEE 802.11 WLANs

Cited by 4 publications

References 6 publications

Enabling location-aware quality-controlled access in wireless networks

Enabling location-aware quality-controlled access in wireless networks

Provisioning QoS for WiFi-enabled Portable Devices in Home Networks

Weighted Window and Class-Based Weighted Window Methods for Per-Station TCP Fairness in IEEE 802.11 WLANs

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