8.2.12 Transport Level Marking
29.2443GPPInterface between the Control Plane and the User Plane nodesRelease 17TS
The Transport Level Marking IE type shall be encoded as shown in Figure 8.2.12-1. It indicates the DSCP to be used for UL/DL transport level marking.
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Bits |
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|
Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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|
1 to 2 |
Type = 30 (decimal) |
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|
3 to 4 |
Length = n |
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|
5 to 6 |
ToS/Traffic Class |
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|
7 to (n+4) |
These octet(s) is/are present only if explicitly specified |
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Figure 8.2.12-1: Transport Level Marking
The ToS/Traffic Class shall be encoded on two octets as an OctetString. The first octet shall contain the DSCP value in the IPv4 Type-of-Service or the IPv6 Traffic-Class field and the second octet shall contain the ToS/Traffic Class mask field, which shall be set to "0xFC". See clause 5.3.15 of 3GPP TS 29.212 [8].
NOTE: The original ECN bits in the IP header of user plane packets are not changed after applying transport level marking.