User's Manual

GSM/802.11b RadioFrame System Method of Procedure
System Description
RadioFrame Networks, Inc.
9
2.1 Base Chassis Unit (BCU)
The Base Chassis Unit (BCU) is the main controller of the RFS and provides:
• The central processing function of the GSM RFS,
• The Abis interface towards the BCU (with TRAU remotely located within the BCU),
• Most of the data link layer and layer 3 functions of the BTS, and
• Network management
The main purpose of the BCU is to accommodate the need for simulcasting and to
provide a single Abis interface to the BSC for each BTS function, therefore the partition of
different BTS functions between BCU and ACU shall be designed with the consideration
of processing load, traffic throughput and delay, user capacity, as well as supporting both
simulcasting and non-simulcasting configurations.
Figure 2 BCU functional diagram.
DLC
BPC
BLIC
BPC
BPC
T1/E1
T1/E1
T1/E1
T1/E1
ERTM
BPC
BCU
Internal
Interface