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8 Signal Flows in the BTS
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Reverse Outband Signaling Signal Flow
The reverse outband signaling signal flow is as follows:
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8.3 OM Signal Flow in the BTS
This topic describes the OM signal flow in the BTS. The OM of the BTS, either originated from
the far-end BAM server or from the near-end maintenance console, is realized through the
operation & maintenance unit (OMU) of the BCKM.
Figure 8-2
8-4
The ATM cells or IP packets from the BSC are sent to the BCIM, which reassembles them,
uses its own main control unit to process them, and sends them to the CCPM or CECM
through the cell bus.
The CCPM or CECM encodes, interleaves, spreads, modulates, and multiplexes the
baseband signals that are sent from the BCIM and carry Abis signaling. Then, the CCPM
or CECM sends the processed baseband signals to the STRM.
The STRM performs demultiplexing, up-conversion, and filtering for the received
baseband signals, and then sends them to the SPAM.
The SPAM amplifies the signals and sends them to the SDFU, which transmits the signals
through the antenna subsystem.
Through the main and diversity antennas, the SDFU receives two paths of CDMA signals
from the MS and then sends them to the STRM.
The STRM performs filtering, down-conversion, and multiplexing for the main and
diversity signals, and then sends them to the CCPM or CECM.
The CCPM or CECM demultiplexes, demodulates, de-interleaves, and decodes the
baseband signals, which carry Abis signaling. After that, the signals are processed by the
BCKM and sent to the BCIM through the cell bus.
The BCIM converts the received signals into ATM cells or IP packets that adapted to Abis
link types, and then sends them to the BSC over the E1/T1/FE link.
shows the OM signal flow in the BTS.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Airbridge BTS3606C CDMA Base Station
Product Description
Issue 03 (2008-02-25)
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