A comparison of TCP performance over three routing protocols for mobile ad hoc networks

Dyer, Thomas D.; Boppana, Rajendra V.

doi:10.1145/501422.501425

Cited by 141 publications

(68 citation statements)

References 19 publications

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“…First, as the topology changes, the path is interrupted and TCP goes into repeated, exponentially increasing time-outs with severe performance impact. Efficient retransmission strategies have been proposed to overcome such problems [4,5,9]. The second problem has to do with the fact that TCP performance in ad hoc multihop environment depends critically on the congestion window in use.…”

Section: Introductionmentioning

confidence: 99%

Enhancing TCP fairness in ad hoc wireless networks using neighborhood RED

Gerla

et al. 2003

Proceedings of the 9th Annual International Conference on Mobile Computing and Networking

162

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Significant TCP unfairness in ad hoc wireless networks has been reported during the past several years. This unfairness results from the nature of the shared wireless medium and location dependency. If we view a node and its interfering nodes to form a "neighborhood", the aggregate of local queues at these nodes represents the distributed queue for this neighborhood. However, this queue is not a FIFO queue. Flows sharing the queue have different, dynamically changing priorities determined by the topology and traffic patterns. Thus, they get different feedback in terms of packet loss rate and packet delay when congestion occurs. In wired networks, the Randomly Early Detection (RED) scheme was found to improve TCP fairness. In this paper, we show that the RED scheme does not work when running on individual queues in wireless nodes. We then propose a Neighborhood RED (NRED) scheme, which extends the RED concept to the distributed neighborhood queue. Simulation studies confirm that the NRED scheme can improve TCP unfairness substantially in ad hoc networks. Moreover, the NRED scheme acts at the network level, without MAC protocol modifications. This considerably simplifies its deployment.

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Section: Introductionmentioning

confidence: 99%

Enhancing TCP fairness in ad hoc wireless networks using neighborhood RED

Gerla

et al. 2003

Proceedings of the 9th Annual International Conference on Mobile Computing and Networking

162

View full text Add to dashboard Cite

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“…An initial study of the effect of routing on the quality of TCP communications is presented by Dyer and Boppana in [8]. Their study concentrates on TCP throughput that is achievable using different ad hoc routing schemes.…”

Section: Related Workmentioning

confidence: 99%

“…In the literature related to the performance analysis of routing schemes [1,8,12,13] we found very few quantitative performance metrics. The informational RFC 2051 [14] summarizes these metrics as follows:…”

Section: Current Performance Metrics and Why They Are Not Informativementioning

confidence: 99%

Evaluating the Effect of Ad Hoc Routing on TCP Performance in IEEE 802.11 Based MANETs

Osipov

Tschudin

2006

Next Generation Teletraffic and Wired/Wireless Advanced Networking

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Abstract.In this paper we analyze the impact of different ad hoc routing schemes on TCP traffic in multihop ad hoc wireless networks. Our hypothesis is that beyond a certain network size the uncontrolled broadcast transmission of routing messages will seriously degrade the performance of the TCP protocol. We experimentally determine the admissible operation ranges of MANETs where the level of such degradation is still acceptable for end users.

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“…TCP exits the frozen state when route is re-established. Fixed-RTO was proposed in [12] with selective and delayed ack to help constraining the damage when packet loss is known to come from path breakage.…”

Section: Airborne Swarmsmentioning

confidence: 99%

TCP over Geo-routing for High Mobility: Vehicle Grids and Airborne Swarms

2006

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Summary. Ad hoc wireless networks have become the architecture of choice for peer to peer communications in areas where the telecommunications infrastructure is inadequate or has failed, A major challenge is the reliable delivery of data when nodes move. The reliable Internet protocol is TCP. However, TCP performs poorly in mobile ad hoc networks, mainly because of route breakage. To overcome this problem, a robust routing protocol must be used. To this effect, Geo-routing has recently received attention in large scale, mobile systems as it does not require endto-end path establishment and pre-computed packet forwarding routing structure at nodes. These properties make Geo-routing robust to highly dynamic route changes. For best performance, however, several parameters must be carefully tuned.In this paper we study the joint optimization of TCP and Geo-routing parameters to handle high speeds. We first introduce two highly mobile ad hoc scenarios that require reliable delivery, namely the vehicle urban grid and the airborne swarms. Then, we study the impact of critical system parameters (e.g., hello message exchange rate, delay timer in TCP for out-of-order delivery, etc) on the performance of both UDP and TCP. We improve hello message efficiency in Geo-routing by using an adaptive hello exchange scheme. Then, we fix the out-of-order problem in TCP by using a receiver-side out-of-order detection and delayed ack strategy. We show that these parameter adjustments are critical for efficient TCP over Geo-routing in highly mobile applications. With these enhancements our TCP with Geo-routing solution easily outperforms TCP over traditional ad hoc routing schemes, such as AODV.

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A comparison of TCP performance over three routing protocols for mobile ad hoc networks

Cited by 141 publications

References 19 publications

Enhancing TCP fairness in ad hoc wireless networks using neighborhood RED

Enhancing TCP fairness in ad hoc wireless networks using neighborhood RED

Evaluating the Effect of Ad Hoc Routing on TCP Performance in IEEE 802.11 Based MANETs

TCP over Geo-routing for High Mobility: Vehicle Grids and Airborne Swarms

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