A microscopic analysis of TCP performance over wireless ad-hoc networks

Anantharaman, V.; Sivakumar, R.

doi:10.1145/511334.511375

Cited by 27 publications

(19 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(5) The ATRA framework [4]: consists of a set of MAC and routing layers mechanisms that reduce route failures, predict route failures before they occur and minimize the latency for route error propagation.…”

Section: Introductionmentioning

confidence: 99%

Novel Delayed ACK Techniques for Improving TCP Performance in Multihop Wireless Networks

Altman

Jiménez

2003

Personal Wireless Communications

View full text Add to dashboard Cite

Abstract. We study in this paper TCP performance over a static multihop network that uses IEEE 802.11 protocol for access. For such networks it has been shown in [6] that TCP performance is mainly determined by the hidden terminal effects (and not by drop probabilities at buffers) which limits the number of packets that can be transmitted simultaneously in the network. We propose new approaches for improving the performance based on thinning the ACK streams that competes over the same radio resources as the TCP packets. In particular, we propose a new delayed ACK scheme in which the delay coefficient varies with the sequence number of the TCP packet. Through simulations we show that the ACK thinning allows to increase TCP throughput substantially more than previous improvement methods.

show abstract

Section: Introductionmentioning

confidence: 99%

Novel Delayed ACK Techniques for Improving TCP Performance in Multihop Wireless Networks

Altman

Jiménez

2003

Personal Wireless Communications

View full text Add to dashboard Cite

show abstract

“…For example, most routing protocols designed for ad-hoc networks rely on MAC layer information to detect link (and hence path) failures. Mechanisms to further improve performance of routing protocols with additional MAC layer information have been proposed in related work [14]. A further degree of coordination possible in ad-hoc networks is the explicit coordination between the different nodes in the network to improve end-to-end performance.…”

Section: Layer Coordinationmentioning

confidence: 99%

“…When the receiver responds back with an ACK, it piggybacks onto the ACK the Qt + Tt value that was stamped on the incoming SYN packet (lines 12-13). The sender, upon receiving the ACK, starts using the rate value obtained based on the feedback (lines [14][15][16][17][18].…”

Section: Figure 6: Pseudo-code For Quick-startmentioning

confidence: 99%

ATP: a reliable transport protocol for ad hoc networks

Sundaresan

Anantharaman

Hsieh

et al. 2005

IEEE Trans. on Mobile Comput.

252

194

View full text Add to dashboard Cite

Existing works have approached the problem of reliable transport in ad-hoc networks by proposing mechanisms to improve TCP's performance over such networks. In this paper we show through detailed arguments and simulations that several of the design elements in TCP are fundamentally inappropriate for the unique characteristics of ad-hoc networks. Given that ad-hoc networks are typically stand-alone, we approach the problem of reliable transport from the perspective that it is justifiable to develop an entirely new transport protocol that is not a variant of TCP. Toward this end, we present a new reliable transport layer protocol for ad-hoc networks called ATP (ad-hoc transport protocol). We show through ns2 based simulations that ATP outperforms both default TCP and TCP-ELFN.

show abstract

“…Various approaches have been suggested to improve TCP performance of MANET at the routing layer [7,8,10,11,12], at the transport layer [2-5, 16, 17], at the MAC layer [9], and at the Physical layer [18]. [10] proposes the COPAS protocol whereby node-disjoint paths are used.…”

Section: Literature Reviewmentioning

confidence: 99%

“…TCP-DATA packets are sent in the forward direction and the TCP-ACK packets in the reverse direction to reduce interference between these packets. [8], on the other hand, uses the same route for both TCP-DATA and TCPACK packets so as to reduce the total number of links that may stall the connection. This mechanism is also capable of predicting the occurrence of a link failure by observing the trend of the signal strengths of packet receptions from neighbours.…”

Section: Literature Reviewmentioning

confidence: 99%

Intelligent IEEE 802.11B Wireless Networks Mac Layer Diagnostic Controller in Mobile Ad Hoc Network

Soo

Phang

Ling

et al. 2007

MJCS

View full text Add to dashboard Cite

In a mobile ad hoc network (MANET), when a node fails during the RTS-CTS INTRODUCTIONA MANET is a collection of autonomous mobile wireless nodes which are free to move about arbitrarily. It may operate in isolation, or may have gateways to and interface with a fixed network. The nodes are capable of singlehop or multi-hop connectivity. One important characteristic of MANET is that the network topology may change randomly and rapidly at unpredictable times as the nodes move or adjust their transmission and reception parameters [1]. The network is important in situations where temporary networks are needed but fixed infrastructure does not exist. Some of these applications such as military or serving disaster relief efforts can be time-critical.A MANET is a potential solution whenever a temporary network is needed and no fixed infrastructure exists. Moreover many applications in this environment are time-critical. It is observed that TCP performs poorly in MANET as demonstrated in [2-6, 7, 8]. Here, a node drops a packet either due to congestion in the shared medium or when it is unable to forward the packet to the next hop. A node cannot reach the next hop node because the next hop node has moved out of transmission range or there are simply too many nodes trying to access the channel at the same time [6]. In a MANET, due to the mobility, bandwidth and energy limitations of nodes, link disconnection and packet loss occur frequently. A high level of packet losses and consequently a high number of TCP retransmission time-outs degraded the overall network performance. It should be noted that in MANET, mobility alone can cause a degradation of performance of TCP in ad hoc networks even when the load is light. The objective in this paper is to address the issue of degradation in TCP performance due to mobility.Towards this objective, we propose mechanisms to reduce the number of packet losses and to reduce control/management packet overhead. We are making use of the signal strength measurements at the physical layer to predict possible link failure to a neighbour that is about to move out of range as proposed by [9]. Thus, if the measurements indicate that the link is likely to break, fewer attempts should be tried to restore the link and a search for new route can be initiated more quickly. This reduces packet loss. On the other hand, if the link is very likely to remain within range, the number of retries to restore the link should be increased as to avoid rerouting because rerouting in MANET consumes a lot of network computation power and resources. This reduces control/management packets overhead. Section 2 describes related works. Section 3 and 4 presents the proposed mechanism and its simulation results. Finally, Section 5 concludes the paper with future work.

show abstract

A microscopic analysis of TCP performance over wireless ad-hoc networks

Cited by 27 publications

References 0 publications

Novel Delayed ACK Techniques for Improving TCP Performance in Multihop Wireless Networks

Novel Delayed ACK Techniques for Improving TCP Performance in Multihop Wireless Networks

ATP: a reliable transport protocol for ad hoc networks

Intelligent IEEE 802.11B Wireless Networks Mac Layer Diagnostic Controller in Mobile Ad Hoc Network

Contact Info

Product

Resources

About