8.32 Bearer Flags
29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 18Stage 3TS
Bearer Flags is coded as depicted in Figure 8.32-1.
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Bits |
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Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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1 |
Type = 97 (decimal) |
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2 to 3 |
Length = n |
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4 |
Spare |
Instance |
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5 |
Spare |
ASI |
Vind |
VB |
PPC |
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6-(n+4) |
These octet(s) is/are present only if explicitly specified |
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Figure 8.32-1: Bearer Flags
The following bits within Octet 5 indicate:
– Bit 1 – PPC (Prohibit Payload Compression): This flag is used to determine whether an SGSN should attempt to compress the payload of user data when the users asks for it to be compressed (PPC = 0), or not (PPC = 1).
– Bit 2 – VB (Voice Bearer): This flag is used to indicate a voice bearer when doing PS-to-CS (v)SRVCC handover.
– Bit 3 – Vind (vSRVCC indicator): This flag is used to indicate that this bearer is an IMS video bearer and is candidate for PS-to-CS vSRVCC handover.
– Bit 4 – ASI (Activity Status Indicator): When set to 1, this flag indicates that the bearer context is preserved in the CN without corresponding Radio Access Bearer established. The target S4-SGSN shall keep the bearer context associated with this indicator preserved. When the target S4-SGSN sends Relocation Request message towards the target RNC, the target S4-SGSN may not request to setup the RABs for those bearer contexts associated with this indicator.