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Transport aspects 2

Table Z.9 – Short names for valid link state transitions

Permitted link state To
transitions
L0 L2.1N L2.1B L2.2
L0 – L0_L2.1N L0_L2.1B N/A
From L2.1N L2.1N_L0 – L2.1N_L2.1B N/A

L2.1B N/A L2.1B_L2.1N – L2.1B_L2.2
L2.2 N/A L2.2_L2.1N L2.2_L2.1B –

Z.6.2.1 Input information
Triggers for link state change operate on data flow and queue fill metrics as described in clause Z.6.2.2.

Z.6.2.2 Traffic information processing

Z.6.2.2.1 Queue arrival processing
QADA represents the aggregate downstream queue arrival, and is the sum of the QADQ over NQOSQds
downstream QoS queues provisioned at the DPU. QADA is calculated by the LRCC-O on receipt of a
QSR-DS-QA from the TMF-O.
Z.6.2.2.2 Queue fill processing
QFDA represents the aggregate downstream queue fill, and is the sum of the QFDQ over NQOSQds
downstream QoS queues provisioned at the DPU. QFDA is calculated by the LRCC-O on receipt of a QSR-DS-
QF from the TMF-O.
QFUA represents the aggregate upstream queue fill, and is the sum of the QFUQ over NQOSQus upstream
QoS queues provisioned at the NT. QFUA is calculated by the LRCC-O on receipt of a QSI-US-QF from the
DRA.
Z.6.2.3 Trigger criteria – principles of operation

Each valid transition has trigger criteria. There are two types of trigger criteria: traffic driven, and battery
operation status driven.

Z.6.2.3.1 Traffic-driven link state transitions

Valid traffic driven link state transitions are shown in Table Z.10.

Table Z.10 – Valid traffic driven link state transitions
Permitted traffic To
driven link state
L0 L2.1N L2.1B L2.2
transitions
L0 – L0_L2.1N N/A N/A
From L2.1N L2.1N_L0 – N/A N/A
L2.1B N/A N/A – L2.1B_L2.2
L2.2 N/A N/A L2.2_L2.1B –

In the L0 and L2.1B states, two traffic driven link state change trigger criteria are defined with separate
parameterisation for each direction:

1. US_TRAFFIC_TRIGR (LinkState, QAUA)
2. DS_TRAFFIC_TRIGR (LinkState, QADA)
In the L2.1N and L2.2 states, two traffic driven link state change trigger criteria are defined with separate
parameterisation for each direction:

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