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7Signal Flow of the Macro NodeBAbout This Chapter

Signal flow of the macro NodeB consists of signal flow of downlink services, signal flow of

uplink services, and signal flow of signaling processing.

7.1 Signal Flow of Downlink Services of the Macro NodeB

The signal flow of downlink services is the user plane data from the RNC to the UE through the

macro NodeB. The MAFU, MTRU, HBBI, HDLP, and NUTI work together to process the

signals of the downlink services carried on the macro NodeB. Based on whether the HDLP is

configured, the signal flow of the downlink services can be categorized as follows:

7.2 Signal Flow of Uplink Services of the Macro NodeB

The signal flow of uplink services refers to the user plane data sent from the UE through the

macro NodeBto the RNC. The MAFU, MTRU, HBBI, HDLP, and NUTI work together to

process the signals of the uplink services carried on the macro NodeB. Based on whether the

HULP is configured, the signal flow of the uplink services can be categorized as follows:

7.3 Signal Flow of Signaling Processing of the Macro NodeB

The signalingof the macro NodeB refers to the signaling over the Iub interface. Working together

with other boards, the NMPT controls the signaling processing.

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7.1 Signal Flow of Downlink Services of the Macro NodeB

The signal flow of downlink services is the user plane data from the RNC to the UE through the

macro NodeB. The MAFU, MTRU, HBBI, HDLP, and NUTI work together to process the

signals of the downlink services carried on the macro NodeB. Based on whether the HDLP is

configured, the signal flow of the downlink services can be categorized as follows:

Signal flow of downlink services when the HDLP is not configured

Only HBBI needs to be configured when the downlink traffic of the macro NodeB is low. Figure

7-1shows the signal flow of downlink services in this situation.

Figure 7-1Signal flow of downlink services when the HDLP is not configured

Signal Flow of Downlink Services When the HDLP Is Configured

The HDLP must be configured when the downlink traffic is high. Figure 7-2shows the signalflow of downlink services in this situation.

7 Signal Flow of the Macro NodeB BTS3812E

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Figure 7-2Signal flow of downlink services when the HDLP is configured

Description of Signal Flow of Downlink Services

No matter the HDLP is configured or not, procedures for signal flow of downlink services are

as follows:

1. The NodeB Iub interface board receives signals from the RNC, performs AAL2 switching,

and then transmits the service signals to the HDLP and the downlink baseband processing

part of the HBBI.

2. The HDLP and the downlink baseband processing part of HBBI perform the following

functions:

l Frame Protocol (FP) processing, coding, mapping from transport channels to physical

channels, framing, spreading and modulation, and power control

l Collecting the processed data and transmitting it to the corresponding MTRU

3. The MTRU:

l The MTRU performs digital RRC pulse-shaping filtering, insertion filtering, Digital UpConversion (DUC), and Digital-Analog Conversion (DAC). Then IF signals are

generated.

l RF signals are generated after up-conversion and are transmitted to the MAFU after

filtering and amplification.

4. The MAFU: The duplexer in the MAFU filters the signals and sends them to antenna on

the NodeB through feeders.

7.2 Signal Flow of Uplink Services of the Macro NodeB

The signal flow of uplink services refers to the user plane data sent from the UE through themacro NodeB to the RNC. The MAFU, MTRU, HBBI, HDLP, and NUTI work together to



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process the signals of the uplink services carried on the macro NodeB. Based on whether the

HULP is configured, the signal flow of the uplink services can be categorized as follows:

Signal Flow of Uplink Services When the HULP Is Not Configured

The HBBI rather than the HULP should be configured when the uplink traffic is low. Figure

7-3shows the signal flow of uplink services in this situation.

Figure 7-3Signal flow of uplink services when the HULP is not configured

Signal Flow of Uplink Services When the HULP Is Configured

Both the HBBI and the HULP should be configured when the uplink traffic is high. Figure

7-4shows the signal flow of uplink services in this situation.



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Figure 7-4Signal flow of uplink services when the HULP is configured

Description of Signal Flow of Uplink Services

No matter the HULP is configured or not, the procedure for the signal flow of uplink services

is as follows:

1. The antenna receives signals from UEs. The signals amplified by the TMA are transmitted

to the MAFU. Note that the TMA can be optionally used to compensate for feeder loss and

to enhance the NodeB receive sensitivity.

2. The MAFU: The MAFU processes UL signals of two channels simultaneously.

l The signals of one channel are processed over the common TX/RX channel. The signals

are sent to the MTRU after filtered by the duplexer and amplified by the LNA.

l The signals of the other channel are processed over the dedicated RX channel. The

signals are sent to the MTRU after filtered by the duplexer and amplified by the LNA.

3. The MTRU: The MTRU simultaneously processes UL signals of two channels in the same

way as follows:

(1) The MTRU amplifies and down converts the signals to produce IF signals.

(2) Through the Analog-Digital Conversion (ADC), the IF signals are converted into

digital signals.

(3) After the Digital Down Conversion (DDC), extraction filtering, RRC filtering, and

Digital Automatic Gain Control (DAGC) processing, digital baseband signals are

produced and signal multiplexing is completed. Then the multiplexed signals are

transferred to the HBBI.

4. The HBBI: The HBBI processes the baseband signals or transmits them to the

corresponding HULP for baseband processing. The procedure for digital baseband

processing is as follows:

(1) The HULP or the HBBI performs access channel demodulation and dedicated channeldemodulation, including multi-path searching, channel estimation, frequency



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tracking, and rake combination to obtain despread and demodulated soft decision

symbols.

(2) After convolutional or Turbo decoding, FP scrambling and SAR-to-AAL2 adaptation,

the HULP sends the symbols to the Iub interface board through the ATM bus.

5. The Iub interface board: The Iub interface board performs AAL2 switching on the uplinkservice data and transmits the switched data to the RNC through the Iub interface.

7.3 Signal Flow of Signaling Processing of the Macro NodeB

The signaling of the macro NodeB refers to the signaling over the Iub interface. Working together

with other boards, the NMPT controls the signaling processing.

Figure 7-5shows the signal flow of signaling processing.

Figure 7-5Signal flow of signaling processing of the NodeB

The signal flow of the signaling processing is as follows:

1. The Iub interface boards receive data from the RNC and forward the data to the NMPT.

2. The NMPT performs decision and processing on the signaling and distributes signaling

processing commands to other boards.

l The NMPT transmits the signaling to HDLPs, HULPs, Iub interface boards, and HBBIs.

l The NMPT transmits the signaling to the MTRU and MAFU through HBBIs.

3. The boards report the processing results to the NMPT.

l The HDLPs, HULPs, Iub interface boards, and HBBIs directly report the board state to

the NMPT.

l The MTRU and MAFU report the board state to the NMPT through HBBIs.

4. The NMPT obtains the NodeB status and reports the status information to the RNC.



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