What is the meaning of 0 QOS in LTE?

I heard first time 0 QOS. Could you please share any reference where this word has been used. I want to go through that reference. Thanks, Harshita.

Hello Harshita,

Even I couldn't get any reference which speaks of 0 QoS.
Ideall QoS is defined based on QCI+ARP+MBR+GBR at bearer level QoS Provisioning and APN-AMBR at APN level.

I came across a requirement which checks for the QoS to be greater than 0.
So was wondering at what condition can we achieve 0 QoS.