In the procedures of video packetization, the importance of a video packet can be marked as either high or low priority, so that it can be scheduled and delivered differently in lower layers.
For example, a cell can be labeled as a video packet, a voice packet or a data packet.
Essentially, the increase in distortion due to the loss of a video packet is a function of all the other video packets that are dependent on it and cannot be decoded if it is not sent.
As aforementioned in Section 3.1, the priority of a video packet is determined according to (2), i.e., the DVFI value of its associated video frame.
Based on the simulation results obtained in this study, the proposed scheme can recover high-quality H.264/AVC video frames from the corresponding corrupted video frames up to a video packet loss rate of 20%.
Instead, when a video packet arrives at MAC, any AC queue which has the shortest estimated delay time among all the ACs will be selected to serve the video packet.
The aforementioned content-aware scheduling strategies as well as the strategies proposed in [23 28] require video content information, such as distortion (if the video packet is dropped or scheduled successfully), decoding deadline associated with each of the video packets, decoding dependence of a video packet, error concealment strategy at the receiver, and several other parameters.
For example, if a video packet has fixed length of 150 bytes, and if there are 42 HP packets and 378 LP packets, then R H 1 is 50.4 kbps and R L 1 is 453.6 kbps.
The upper bound on the video packet dropping has been selected not only to be strict (in [32] the upper bound is defined as 1%) but also to account for the fact that if a video packet loss corresponds to an I frame, then the "glitch" in the video will propagate to the rest of the video frames in the GoP.
The LTE/LTE-A has a hierarchical architecture, where video packets are first passed through Packet Data Network Gateway (P-GW), located in the core network.
