Enhancing jitter buffer performance through radio level feedback

摘要

A jitter buffer in a Voice over LTE receiver may be influenced by radio level feedback (RLF) from both local and remote endpoints to preemptively adjust the jitter buffer delay in anticipation of predicted future losses that have a high probability of occurring. The radio events of the RLF and the scenarios that trigger the preemptive adjustments may be identified, and their use may be expressed in terms of mathematical formulas. In prior art designs, the instantaneous jitter is derived from a weighted history of the media stream, and consequently only packets that have already arrived are used to compute the instantaneous jitter to adjust the length of the buffer. By providing and using RLF from both local and remote endpoints, the anticipated delay—for packets that have not yet arrived—may be used to preemptively adjust the buffer, thereby minimizing packet loss without introducing unnecessary delay.

主权项

1. A wireless user equipment (UE) device, the UE device comprising:
a radio, comprising one or more antennas for performing wireless communication that includes receiving incoming transmission packets; a jitter buffer configured to queue the incoming transmission packets; and a processing element, coupled to the radio and the jitter buffer, and configured to:
identify radio events that affect a timing of future transmission packets to be received in the future by the radio;estimate a specified number of emperical factors for each event type of the identified radio events;calculate a projected delay associated with the radio events according to at least the estimated specified number of empirical factors;compute a queue delay for all packets that have already been queued in the jitter buffer;determine an effective delay according to the queue delay and the projected delay; andcontrol when the queued incoming transmission packets are released from the jitter buffer according to at least the effective delay.