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Technical Description
Figure 17
6.2.4
Strict Priority
With strict priority scheduling, the eight traffic class queues are handled
one-by-one with the highest priority queue first. The scheduler always handles
the queue with highest priority until it is empty. Once the queue with highest
priority is empty the scheduler moves on to the next queue with lower priority. If
frames are placed in a queue with higher priority, the scheduler handles these
frames before it returns to handle the frames in the queue with lower priority.
6.2.5
Congestion Handling
Congestion Avoidance prevents saturation of queues managed by the classifier,
which discards incoming packets according to a specific policy. The following
algorithms are supported to realize the Congestion Avoidance:
•
•
Each algorithm has characteristic parameters, such as buffer size and
thresholds, that can be configured for the different traffic class queues.
6.3
Performance Monitoring
The following counters are monitored for the whole radio link or for each traffic
class:
28
TC 0
Disabled
TC 1
Disabled
TC 2
Disabled
TC 3
10
ms
TC 4
10 ms
TC 5
10 ms
TC 6
10 ms
TC 7
10 ms
Default Settings for Packet Aging
Tail dropping
In case of queue congestion, all incoming packets are dropped. Tail
dropping acts on each queue independently.
Timestamp dropping
Each incoming packet is tagged with a timestamp. In case of congestion
the oldest packets are discarded. Packets will also be discarded if they
remain in the queue longer than the set aging time.
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