275 research outputs found
Observation-based Cooperation Enforcement in Ad Hoc Networks
Ad hoc networks rely on the cooperation of the nodes participating in the
network to forward packets for each other. A node may decide not to cooperate
to save its resources while still using the network to relay its traffic. If
too many nodes exhibit this behavior, network performance degrades and
cooperating nodes may find themselves unfairly loaded. Most previous efforts to
counter this behavior have relied on further cooperation between nodes to
exchange reputation information about other nodes. If a node observes another
node not participating correctly, it reports this observation to other nodes
who then take action to avoid being affected and potentially punish the bad
node by refusing to forward its traffic. Unfortunately, such second-hand
reputation information is subject to false accusations and requires maintaining
trust relationships with other nodes. The objective of OCEAN is to avoid this
trust-management machinery and see how far we can get simply by using direct
first-hand observations of other nodes' behavior. We find that, in many
scenarios, OCEAN can do as well as, or even better than, schemes requiring
second-hand reputation exchanges. This encouraging result could possibly help
obviate solutions requiring trust-management for some contexts.Comment: 10 pages, 7 figure
Chronology of the development of Active Queue Management algorithms of RED family. Part 1: from 1993 up to 2005
This work is the first part of a large bibliographic review of active queue management algorithms of the Random Early Detection (RED) family, presented in the scientific press from 1993 to 2023. The first part will provide data on algorithms published from 1993 to 2005
Proportional bandwidth distribution in IP networks implementing the assured forwarding PHB
Recent demands for new applications are giving rise
to an increasing need of Quality of Service (QoS).
Nowadays, most IP-based networks tend to use the
DiffServ architecture to provide end-to-end QoS.
Traffic conditioners are a key element in the
deployment of DiffServ. In this paper, we introduce a
new approach for traffic conditioning based on feedback
signaling among boundary nodes and traffic
conditioners. This new approach is intended to provide
a poportional distribution of excess bandwidth to endusers.
We evaluate through extensive simulations the
performance of our proposal in terms of final
throughput, considering contracted target rates and
distribution of spare bandwidth. Results show a high
level of fairness in the excess bandwidth allocation
among TCP sources under different network
conditions
An Energy-conscious Transport Protocol for Multi-hop Wireless Networks
We present a transport protocol whose goal is to reduce power consumption without compromising delivery requirements of applications. To meet its goal of energy efficiency, our transport protocol (1) contains mechanisms to balance end-to-end vs. local retransmissions; (2) minimizes acknowledgment traffic using receiver regulated rate-based flow control combined with selected acknowledgements and in-network caching of packets; and (3) aggressively seeks to avoid any congestion-based packet loss. Within a recently developed ultra low-power multi-hop wireless network system, extensive simulations and experimental results demonstrate that our transport protocol meets its goal of preserving the energy efficiency of the underlying network.Defense Advanced Research Projects Agency (NBCHC050053
- …