5.27.2.5.1 Overview

If the NG-RAN receives a TSCAI containing a BAT Window or the Capability for BAT adaptation for a QoS Flow, the NG-RAN can determine a BAT offset in order to align the arrival of the traffic bursts with the next expected transmission opportunity over the air interface in each direction (i.e. DL or UL). The BAT offset can take a positive or a negative values.

If the NG-RAN receives a TSCAI containing a Periodicity Range for a QoS Flow, the NG-RAN can determine an adjusted Periodicity along with above specified BAT offset, in order to align the periodicity of the traffic bursts with the expected time interval between subsequent transmission opportunities over the air interface in each direction (i.e. DL or UL). If the TSCAI contained a value range, the adjusted Periodicity should be any value between the lower bound and upper bound. If the TSCAI contained a list of Periodicity value(s), the adjusted Periodicity should be one of these values.

NG-RAN may support the following feedback mechanisms:

• Proactive RAN feedback for adaptation of Burst Arrival Time and Periodicity: NG-RAN may provide a Burst Arrival Time offset and an adjusted Periodicity as part of QoS flow establishment or modification as illustrated in clause 5.27.2.5.2;
• Reactive RAN feedback for Burst Arrival Time adaptation: NG-RAN may provide a Burst Arrival Time offset after QoS flow establishment as illustrated in clause 5.27.2.5.3.