GPRS Radio Network Configuration
• Physical Channel Structure
• Cell Re -Selection
• GPRS Channel Allocation
• Radio Network Features
• Cell planning
• GPRS Cell Parameters and BSC Properties and SGSN Parameters
• EGPRS Radio Network Enhancements in R9.1
GPRS Radio Network
Configuration
Part 1: Physical Channel Structure
Packet Data Logical Channels
• PBCCH – broadcast of system information (DL)
• PCCCH –common control signalling
– PRACH – uplink packet transfer initiation (UL)
– PAGCH – resource assignemnt (DL)
– PPCH – paging for either PS or PS&CS (DL)
– PNCH – PTM – M, Multicast (DL)
• PDCCH
– PACCH – MS- specific signalization (UL & DL)
– PTCCH/U – MS- specific timing advance information (UL)
– PTCCH/D – timing advance information for group of MSs (DL)
• PDTCH – end-user data traffic
– PDTCH/U – end- user traffic in uplink direction (UL)
– PDTCH/D – end- user traffic in downlink direction (DL)
GPRS Multi-Frame Structure
• One TDMA Frame (F) consists of 8 Time Slots (TS)
• 4 Consecutive TDMA Frames (F) are groupped into one TDMA Block (B)
• 12 Blocks + 2 Idle TDMA Frames+ 2 TDMA Frames used for PTCCH
consisting 52 Multi- Frame structure
GPRS Multi-Frame Structure (MPDCH)
• PBCCH is indicated on BCCH channel
• Different structure for UL/DL
• Mapping of channels are controlled by PBCCH parameters
• In downlink case first blocks can be reserved for PRACH, other are
used for PDTCH and PACCH channels
GPRS Multi-Frame Structure (PDTCH)
• Very similar in UL and DL
• Almost all Blocks used for PDTCH & PACCH
• Idle and PTCCH can be used for signal measurements and BSIC
identification
to be continue....