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QoS

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in IETF BCP14 (RFC2119 & RFC8174)

Copyright (c) 2023 General Motors GTO LLC

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
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regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

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SPDX-FileType: DOCUMENTATION
SPDX-FileCopyrightText: 2023 General Motors GTO LLC
SPDX-License-Identifier: Apache-2.0

Prioritization is used to control QoS at uP-L1 between devices. This document will follow RFC4594 Configuration Guidelines for DiffServ Service Classes.

  • All messages MUST be assigned a priority

  • Every topic MUST have a priority code associated with it.

  • Default priority when not assigned MUST be CS1

Table 1. QoS Classifications
Class Description Use Case

CS0

Low Priority. No bandwidth assurance

File Transfer

CS1

Standard, undifferentiated application

General (unclassified)

CS2

Operations, Administration, and Management

Streamer messages (sub, connect, etc…)

CS3

Multimedia streaming

Video Streaming

CS4

Real-time interactive

High priority (rpc events)

CS5

Signaling

Important

CS6

Network control

Safety Critical

Note
Please see uP-L2 Specifications for values used per message type.