Patent ID: 7894363

Claim:
A traffic quality measurement apparatus comprising: an interval measurement unit to measure a plurality of packet transfer times t(i) for a plurality of packets; a packet length measurement unit to measure a plurality of packet lengths L(i) for the plurality of packets; and, an analyzing unit to obtain a variance of a data transfer rate DTR ⁡ ( i ) ⁢ L ⁡ ( i ) t ⁡ ( i ) - t ⁡ ( i - 1 ) for each packet, where the variance of the data transfer rate is VDTR and is obtained by evaluating: VDTR = ∑ i = 1 N ⁢ ( L ⁡ ( i ) ∑ k = 1 N ⁢ L ⁡ ( k ) × ln ⁡ ( L ⁡ ( i ) ∑ m = 1 N ⁢ L ⁡ ( m ) ⁢ ∑ n = 1 N ⁢ Δ ⁢ ⁢ t ⁡ ( n ) Δt ⁡ ( i ) ) ) , wherein (N+1) data points are used and are indexed by an index i ranging from 0 to N, and Δt(i)=t(i)−t(i−1) is a packet transfer time interval between an (i−1)-th packet and an i-th packet.