Patent ID: 8665745
Filing Date: 2014-03-04
Classification: H04L

Abstract:
1. A method for determining a buffer level of a jitter data buffer comprised in a receiver adapted to sequentially receive data packets from a communications network, wherein frames are encoded into the data packets, each frame comprising timestamp information, T, and payload size information, L, wherein the buffer level is determined on the basis of a first part of frame arrival delay related to payload size variation between frames and a second part related to the amount of crosstraffic in the communications network, the method comprising, for each frame: determining a frame payload size difference, ΔL, by comparing L of the current frame with L of a previous frame; determining a frame inter-arrival time, Δt, by comparing the measured arrival time of the current frame with the measured arrival time of a previous frame; determining a temporal frame spacing, ΔT, by comparing T of the current frame with T of a previous frame; determining a frame network transit delay, d, on the basis of the difference between Δt and ΔT; estimating a set of parameters of a linear relationship between ΔL and d on the basis of ΔL and d for the current frame and ΔL and d determined for at least one previous frame, wherein a first parameter and a second parameter comprised in the set are indicative of the first and second part, respectively; estimating a maximum frame payload size and an average frame payload size on the basis of L of the current frame and L of at least one previous frame; and determining the buffer level on the basis of the maximum frame payload size, the average frame payload size and the parameters of the linear relationship.