Huawei Airbridge BTS3606C Technical specifications
8 Signal Flows in the BTS
About This Chapter
This topic describes the signal flows in the BTS. From the Abis interface to the Um interface,
the signals in the BTS form signal flows during transmission. The signal flows in the BTS are
the Abis traffic signal flow, Abis signaling signal flow, OM signal flow, and clock signal flow.
The signal flows in the BTS are shown in Figure 8-1, where different types of lines are used to
mark different types of signal flows.
Figure 8-1 Signal flows in the BTS
MC
OMU
S
T
R
M
RXD
TX
RXM
TXF
SPAM
SDFU
Antenna
&
Feeder
CCPM
/
CECM
CCPM
/
CECM
Clock Signal
RF Singal
Signaling Signal
OAM Signal
Traffic Signal
BCIMBSC
BAM
BCKM
CLK
Telnet
S
T
R
M
RXD
TX
RXM
TXF
SPAM
SDFU
Antenna
&
Feeder
The Abis traffic signals, Abis signaling signals, and OM signals are adapted and carried through
the asynchronous transfer mode (ATM)/IP protocols. The ATM/IP links over different interfaces
are provided by different physical links. The details are as follows:
Airbridge BTS3606C CDMA Base Station
Product Description 8 Signal Flows in the BTS
Issue 03 (2008-02-25) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
8-1
lThe physical links over the Abis interface are E1/T1/FE links.
lThe physical links between baseband subracks are cell buses.
lThe CCPMs/CECMs are connected to the STDM through SFP cables.
The Abis traffic signals and Abis signaling signals are baseband signals. They are processed by
the STRM and converted into RF signals, and then transmitted by the RF modules. The STRM
also receives RF signals and converts them into baseband signals.
8.1 Abis Traffic Signal Flow in the BTS
This topic describes the Abis traffic signal flow in the BTS. The Abis traffic signals consist of
voice service traffic signals, inband signaling signals, and data service traffic signals.
8.2 Abis Signaling Signal Flow in the BTS
This topic describes the Abis signaling signal flow in the BTS. Two types of signals, namely,
BTS control signaling signals and outband signaling signals, are transmitted on the Abis common
signaling channel.
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.
8.4 Clock Signal Flow in the BTS
This topic describes the clock signal flow in the BTS.
8 Signal Flows in the BTS
Airbridge BTS3606C CDMA Base Station
Product Description
8-2 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 03 (2008-02-25)
8.1 Abis Traffic Signal Flow in the BTS
This topic describes the Abis traffic signal flow in the BTS. The Abis traffic signals consist of
voice service traffic signals, inband signaling signals, and data service traffic signals.
Forward Traffic Signal Flow
The forward traffic signal flow is as follows:
1. The ATM cells or IP packets from the BSC are sent to the BCIM, which reassembles them
and sends them to the CCPM or CECM through the cell bus.
2. The CCPM or CECM encodes, interleaves, spreads, modulates, and multiplexes the
baseband signals that are sent from the BCIM and carry traffic. Then, the CCPM or CECM
sends the processed baseband signals to the STRM.
3. The STRM performs demultiplexing, up-conversion, and filtering for the received
baseband signals, and then sends them to the SPAM.
4. The SPAM amplifies the signals and sends them to the SDFU, which transmits the signals
through the antenna subsystem.
Reverse Traffic Signal Flow
The reverse traffic signal flow is as follows:
1. Through the main and diversity antennas, the SDFU receives two paths of CDMA signals
from the MS and then sends them to the STRM.
2. The STRM performs filtering, down-conversion, and multiplexing for the main and
diversity signals, and then sends them to the CCPM or CECM through the SFP port.
3. The CCPM or CECM demultiplexes, demodulates, de-interleaves, and decodes the
baseband signals, which carry traffic. Then, the CCPM or CECM sends the processed
signals to the BCIM through the cell bus.
4. The BCIM converts the received signals into ATM cells or IP packets that are adapted to
Abis link types, and then sends them to the BSC over the E1/T1/FE link.
8.2 Abis Signaling Signal Flow in the BTS
This topic describes the Abis signaling signal flow in the BTS. Two types of signals, namely,
BTS control signaling signals and outband signaling signals, are transmitted on the Abis common
signaling channel.
BTS Control Signaling
The BTS control signaling signals contains parameters or control messages sent from the BSC
to the BTS for processing. The BTS control signaling signals are not transmitted as RF signals.
For example, the BSC sends PN codes to the BTS so that the channel boards can process them.
Forward Outband Signaling Signal Flow
The forward outband signaling signal flow is as follows:
Airbridge BTS3606C CDMA Base Station
Product Description 8 Signal Flows in the BTS
Issue 03 (2008-02-25) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
8-3
1. 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.
2. 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.
3. The STRM performs demultiplexing, up-conversion, and filtering for the received
baseband signals, and then sends them to the SPAM.
4. The SPAM amplifies the signals and sends them to the SDFU, which transmits the signals
through the antenna subsystem.
Reverse Outband Signaling Signal Flow
The reverse outband signaling signal flow is as follows:
1. Through the main and diversity antennas, the SDFU receives two paths of CDMA signals
from the MS and then sends them to the STRM.
2. The STRM performs filtering, down-conversion, and multiplexing for the main and
diversity signals, and then sends them to the CCPM or CECM.
3. 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.
4. 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.
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 shows the OM signal flow in the BTS.
8 Signal Flows in the BTS
Airbridge BTS3606C CDMA Base Station
Product Description
8-4 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 03 (2008-02-25)
Figure 8-2 OM signal flow in the BTS
MC
OMU
S
T
R
M
RXD
TX
RXM
TXF
SPAM
SDFU
Antenna
&
Feeder
CCPM
/
CECM
CCPM
/
CECM
Clock Signal
RF Singal
Signaling Signal
OAM Signal
Traffic Signal
BCIMBSC
BAM
BCKM
CLK
Telnet
S
T
R
M
RXD
TX
RXM
TXF
SPAM
SDFU
Antenna
&
Feeder
8.4 Clock Signal Flow in the BTS
This topic describes the clock signal flow in the BTS.
Figure 8-3 shows the clock signal flow in the BTS.
Figure 8-3 Clock signal flow in the BTS
The clock signal flow in the BTS is as follows:
Airbridge BTS3606C CDMA Base Station
Product Description 8 Signal Flows in the BTS
Issue 03 (2008-02-25) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
8-5
lThe satellite receiver of the BCKM receives 1 pulse per second (PPS) synchronization
signals from GPS and GLONASS satellites through the satellite antenna. Then, the CLKM
processes the 1PPS signals to generate 2S and 16Fc clock signals (19.6608 MHz) required
by the CCPM or CECM and outputs 2S and 10 MHz signals for testing.
lThe BCIM obtains 25 MHz clock signals from the clock bus.
lThe CCPM or CECM obtains 2S signals, 25 MHz signals, and 16Fc signals from the clock
bus. Then, the CCPM or CECM converts these signals into internal clock signals that it
requires and 100Fc clock signals that other boards require. The 2S signals are sent to the
logic, which converts them into the signals required by the processing chip.
lThrough the SFP port, the STRM uses the internal chip to obtain 100Fc clock signals from
the CCPM or CECM. Then, the 100Fc clock signals are converted into 12.288 MHz clock
signals after undergoing 10 frequency division. Through phase locking, the 12.288 MHz
clock signals are converted to 10 MHz clock signals, used by the RF part, and 64Fc clock
signals, used by the intermediate frequency (IF) part.
lIf ODU cascading is used, the ODUs obtain 100Fc clock signals from the CCPM or CECM.
8 Signal Flows in the BTS
Airbridge BTS3606C CDMA Base Station
Product Description
8-6 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 03 (2008-02-25)
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