From GPRS: General Packet Radio Service

6.10 Example of PBCCH + PCCCH Configuration

The multiplexing of the packet channels on a PDCH is not fixed like in the GSM system. In GPRS, it is managed by some parameters and the following block order: B0, B6, B3, B9, B1, B7, B4, B10, B2, B8, B5, and B11.

Figure 6-10 shows the parameters that manage the multiplexing of the packet channels on the same PDCH:

Figure 6-10: An example of the packet logical channel configuration.
  • BS_PBCCH_BLKS This indicates the number of PBCCH blocks used to broadcast the PSI.

    These blocks are always the first blocks according to the multiframe blocks order. The parameter is broadcast on the first PBCCH block (B0). If many PCCCH channels (the total number of PCCCH channels is given by the parameter BS_PCC_CHANS broadcast on PBCCH) are present, PDTCH may be transmitted at the PBCCH blocks position in the other PCCCH channels (because PBCCH blocks are only transmitted on one single time slot in the cell).

  • BS_PAG_BLKS_RES (number of blocks for access grant) Indicates the number of PCCCH blocks following the PBCCH blocks (according to the multiframe blocks order) on which paging is forbidden.

    These blocks are thus reserved for PAGCH, and eventually PDTCH/PACCH/PTCCH. If one of these blocks is used for PAGCH, then the corresponding UL channels can be used for network access (PRACH), so uplink state flag (USF) is annotated as being free in the MAC header of the radio block. If one of these blocks is used for...

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Topics of Interest

Packet Traffic Channels The Packet Traffic Channels are the only ones used in GPRS Phase I. Figure 6-11 provides an example of the Packet Traffic Channel configurations. Figure 6-11: Packet Traffic...

Packet Broadcast Control Channel (PBCCH) The presence of a PBCCH channel in the cell is indicated by a PBCCH channel description in the SI 13 broadcast on the BCCH (providing GPRS-specific...

Packet Logical Channels Multiframe Structure The packet channels carry either RLC data blocks or RLC/MAC control blocks (except PRACH and PTCCH UL, which use an access burst instead of normal...

System Information Type 13 (SI 13) SI 13 message is broadcast by the network on the BCCH. The message provides the mobile station with GPRS cell-specific, access-related information. The information...

5.1 RLC/MAC Block Structure The RLC/MAC block is the basic transport unit on the air interface that is used between the mobile and the network. It is used to carry data and RLC/MAC signaling. In the...