8.7 Aggregate Maximum Bit Rate (AMBR)
29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 18Stage 3TS
Aggregate Maximum Bit Rate (AMBR) is transferred via GTP tunnels. The sending entity copies the value part of the AMBR into the Value field of the AMBR (APN-AMBR) IE.
AMBR is defined in clause 9.9.4.2 of 3GPP TS 24.301 [23], but it shall be encoded as shown in Figure 8.7-1 as Unsigned32 binary integer values in kbps (1000 bits per second).
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Bits |
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|
Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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|
1 |
Type = 72 (decimal) |
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|
2 to 3 |
Length = 8 |
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|
4 |
Spare |
Instance |
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|
5 to 8 |
APN-AMBR for uplink |
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|
9 to 12 |
APN-AMBR for downlink |
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Figure 8.7-1: Aggregate Maximum Bit Rate (AMBR)
The APN-AMBR for uplink and the APN-AMBR for downlink may require converting values in bits per second to kilo bits per second when the APN-AMBR for uplink and the APN-AMBR for downlink are received from an interface other than GTPv2 interface. If such conversions result in fractions, then the value of APN-AMBR for uplink and the APN-AMBR for downlink shall be rounded upwards.
NOTE: The encoding in 3GPP TS 24.301 [23] is different from the encoding within this specification.