7.7.19 RAB Context
29.0603GPPGeneral Packet Radio Service (GPRS)GPRS Tunnelling Protocol (GTP) across the Gn and Gp interfaceRelease 17TS
The RAB context information element contains sequence number status for one RAB in RNC, which corresponds to one PDP context in CN. The RAB contexts are transferred between the RNCs via the SGSNs at inter SGSN hard handover.
NSAPI identifies the PDP context and the associated RAB for which the RAB context IE is intended.
DL GTP-U Sequence Number is the number for the next downlink GTP-U T-PDU to be sent to the MS.
UL GTP-U Sequence Number is the number for the next uplink GTP-U T-PDU to be tunnelled to the GGSN.
DL PDCP Sequence Number is the number for the next downlink PDCP-PDU to be sent to the MS.
UL PDCP Sequence Number is the number for the next uplink PDCP-PDU to be received from the MS.
|
1 |
Type = 22 (Decimal) |
|
|
2 |
Spare (0 0 0 0) |
NSAPI |
|
3-4 |
DL GTP-U Sequence Number |
|
|
5-6 |
UL GTP-U Sequence Number |
|
|
7-8 |
DL PDCP Sequence Number |
|
|
9-10 |
UL PDCP Sequence Number |
|
Figure 27: RAB Context Information Element