Metrics

Mathematical formulation

Description

Acceptable

Packet loss ratio (PLR)

PLR is the corrupted, lost, or excessively delayed packets divided by the total number of packets expected at the video client station.

10⁻³

Packet End-to-End Delay (E2E) (ms)

D_E2E = Q (d_proc + d_queue + d_trans + d_prop), where:

Q is the number of network elements between the media server and mobile station .

d_proc is the processing delay at a given network element.

d_queue is the queuing delay at a given network element.

d_trans is the transmission time of a packet on a given communication link between two network elements.

d_prop is the propagation delay across a given network link

Packet delay is the average packet transit time between the media server and the video client station.

<400

Packet delay variation

(PDV) or packet jitter (ms)

j_pkt = t_actual – t_expected, where:

t_actual is the actual packet reception time.

t_expected is the expected packet reception time.

Packet jitter is defined as the variability in packet delay within a given media at video client station.

<50

Throughput (bps)

The throughput for variable bit rate (VBR) traffic loading is dynamic in nature and it is a function of the scene complexity and associated audio content. Variable bit rate (VBR) traffic loads is typically quoted as peak throughput ranges.

Throughput is defined as the traffic load that the media stream will add to the network. It can be measured in bits/sec.

[221-5311]