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Method | # of bits | Available Delay Metrics | Impairments Resiliency | # of meas. | |
---|---|---|---|---|---|
UniDir Observer | BiDir Observer | ||||
S: Spin Bit | 1 | RTT | x2, Half RTT | low | very high |
D: Delay Bit | 1 | RTT | x2, Half RTT | high | medium |
SD: Spin Bit & Delay Bit * | 2 | RTT | x2, Half RTT | high | very high |
Method | Bits | Available Loss Metrics | Prto | Measurement Aspects | ||
---|---|---|---|---|---|---|
UniDir Observer | BiDir Observer | Fidelity | Delay | |||
T: Round-Trip Loss Bit | $1 | RT | x2, Half RT | * | Rate by sampling 1/3 to 1/(3*ppa) of pkts over 2 RTT | ~6 RTT |
Q: sQuare Bit | 1 | Upstream | x2 | * | Rate over N pkts (e.g., 64) | N pkts (e.g., 64) |
L: Loss Event Bit | 1 | E2E | x2 | # | Loss shape (and rate) | Min: RTT, Max: RTO |
QL: sQuare + Loss Ev. Bits | 2 | Upstream | x2 | # | see Q | see Q |
Downstream | x2 | # | see Q|L | see L | ||
E2E | x2 | # | see L | see L | ||
QR: sQuare + Ref. Sq. Bits | 2 | Upstream | x2 | * | Rate over N*ppa pkts (see Q bit for N) | see Q |
3/4 RT | x2 | * | N*ppa pkts (see Q bit for N) | |||
!E2E | E2E, Downstream, Half RT | * |
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