ZTE Corporation ZXG-BTS2 Manuale Utente

Chapter 4 - System Functions

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I G U R E

5 5

H Y S I C A L

N V I R O N M E N T

E Q U E S T

/ A

C K N O W L E D G E M E N T

LAPD

FURRM

HPIMa

LAPD

BSC

OAMM

DL_ DATA_IND (PHYS

CONTEXT REQ)

(PHYS CON-TEXT

REQ)

DL_DATA_REQ (PHYS

CONTEXT CONF)

(PHYS CON-TEXT

CONF)

This optional procedure enables the BSC to obtain the physical

environment information before the channel change.
The physical environment information can be sent to a new TRX (which
may be in another cell).
The PHY CONTEXT CONF message to be returned by the BTS to the
BSC contains the MS/BS power and TA that are obtained from the

channel , and the BTS does not process the physical environment
information temporarily.

4. SACCH fill-in information change

The procedure of modifying the SACCH fill-in information is shown in

Figure 56.

I G U R E

5 6

R O C E D U R E O F

O D I F Y I N G

S A C C H F

I L L

I N

N F O R M A T I O N

LAPDm

FURRM

HPIMan

LAPD

BSC

OAMM

DL_ DATA_IND (SACCH INFO

MODIFY)

(SACCH INFO

MODIFY)

MPH_RRCmdToCHP

(CHP SET/STOP

SACCH INFO )

(SYS INFO TYPE

5/6/5bis/5ter)

The BSC instructs the BTS that the new system message (<RR>

System Information Type 5/5bis/5ter/6) will change the original
system message that is filled in the SACCH.
The SACCH fill-in information in the SACCH INFO MODIFY message will
be sent in the specified channel, till the channel is released or changed

by another SACCH INFO MODIFY message.
When the BTS receives the SACCH INFO MODIFY message, it takes out
the system message (<RR> System Information Type 5/5bis/5ter/6)

and sends to the CHP module to change the original system
information. If there is no system message content, it indicates that

such system messages will stop being sent on this channel.