US 2010/0142375 A1Published application

Method and system for measuring quality of networking nodes

AssigneeFundacio Privada Centre Technologic de Telecomunicacions de Catalunya

InventorsMarc Portoles Comeras, Andrey Krendzel, Joseph Mangues Bafalluy

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Abstract

This method is applied to nodes of networks based on carrier sense measurements and defines as well as determines accurately the values of two quality metrics to characterize respectively the accuracy of a node in carrier sensing and the ability of said node to cope with a given workload of concurrent incoming and outgoing communication traffic. These two quality metrics characterizes the intrinsic losses of a node due to different hardware and software limitations, which generate unexpected traffic losses in the node and make experimentally obtained results not match with those obtained through theoretical models. A testing controlled scenario is provided for allowing to measure the values of the two quality metrics separately, detecting the presence of the maximum value measured for concurrent workload of the node under test in the measurement of the accuracy of said node in carrier sensing.

Claims13

Dependent claims

Method for measuring quality of networking nodes, wherein a node (N) transmits and receives data packets of a length (L) using a distributed medium access protocol relying on detecting transmissions from other nodes by carrier sensing, and for transmitting data the node (N) is at one of three possible states:

an idle state, an active state and an stall state, the method being characterised by comprising the steps of:
setting a controlled environment where at least two independent multicast packet flows, a first flow (f1) and a second flow (f2), are generated using identical modulation rate and packet length (L), and where the node (N) receives the first flow (f1) and sends second flow (f2) at a packet rate;
determining, in the controlled environment, values of a mean time that the node (N) remains in idle state (Tidle)/a mean time that the node (N) remains in active state (Tactive) and a mean time that the node (N) is expected to remain in stall state (Texpected—stall);
increasing periodically the packet rate until the controlled environment reaches a saturation point;
measuring a data rate (d) sent by the node (N) at the saturation point in the controlled environment;
measuring a maximum data rate (β) sent and received concurrently by the node (N) at the saturation point in the controlled environment;
measuring a carrier sensing accuracy (α) of the node (N) for the modulation rate and packet length (L).

4 more elements

Dependencies are inferred from the claim text.