Table 3 Examples of causes of low QoE and advices to users (QoE advices module)
From: YouTube QoE evaluation tool for Android wireless terminals
Cause | Evidence | Advice | |
|---|---|---|---|
Low throughput | High traffic load | ||
IF many applications synchronizing | → | Temporarily stop data synchronization | |
ELSE IF many apps running | → | Offer some apps/services to be switched off | |
ELSE | → | Switch to other technology (WiFi, mobile) | |
Low network traffic and connected to a cellular network | |||
IF GSM/3G lock on 2G | → | Activate 3G | |
ELSE IF low RSSI and WiFi available | → | Switch to a WiFi connection | |
ELSE IF low RSSI and WiFi switched on and WiFi not available | → | Switch off WiFi to avoid interference | |
ELSE IF low RSSI and Bluetooth switched on | → | Switch off Bluetooth to avoid interference | |
Low network traffic and connected to WiFi | |||
IF WiFi tethering is activated | → | Switch off WiFi tethering | |
ELSE IF Bluetooth switched on | → | Switch off Bluetooth | |
ELSE | → | Switch to a cellular network connection | |
Low memory | Low memory status flag is TRUE | ||
IF many apps/services running | → | Offer some apps/services to be switched off | |
ELSE IF ‘hungry’ app detected | → | Offer to switch off ‘hungry’ app | |
ELSE | → | Check for system updates | |
High CPU load | CPU load is high during a period | ||
IF many apps/services running | → | Offer some apps/services to be switched off | |
Low CPU frequency forced | CPU freq low | ||
IF low battery level | |||
OR high battery temperature | → | Wait until battery gets in better conditions | |
ELSE IF aggressive power save profile selected | → | Select a performance oriented profile | |
ELSE | → | Check for system updates | |
Video requirements exceeds terminal capabilities | YouTube API video source and device HW information | ||
IF device capability < video req. | → | Try to select less demanding video files, switch off high quality (HQ) option | |
Low video quality in origin | YouTube API video source information | ||
IF low resolution/coding rate | → | Select another file of higher quality | |