Zte ZXG10 OB06, Technical Manual

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Chapter 4 - System Functions
Confidential and Proprietary Information of ZTE CORPORATION 71
All software versions are downloaded into the CMM’s FLASH memory
through the BSC. The CMM validates the versions, and loads the software
to the FUC when it finds any difference with the TRM software.
The TRM software is stored in the FLASH memory on the FUC board. After
DSP is restarted, the FUC software loads the CHP software to the CHP and
CIP through the HPI interface.
The software loading procedure is described as follows:
1. The CMM sends to the FUC the “software loading initialization”
message.
2. The FUC returns the CMM the “software loading initialization finished”
message.
3. CMM divides the software versions into message segments and sends
to FUC segment by segment.
4. When all software data are sent, the CMM sends to the FUC the
“software loading finished” message.
5. The FUC returns the CMM the “software loading finished
acknowledgement” message.
Ultra-Distance Coverage
Ultra-distance coverage refers to coverage by a BTS with a cell radius
greater than 35 km, which is stipulated by the GSM standard.
According to the GSM protocol, the maximum access radius of the GSM
system is 35 km, and the corresponding time advance (TA) is 63. This
limit is made because, under normal conditions, and in a 900 M
propagation environment, it is difficult to offer a coverage with a radius
greater than 35 km. But, in some special propagation conditions, such as
low propagation loss areas like coasts, deserts and grasslands, with the
help of BTS of high-power output and high-gain antenna, it will be possible
to offer coverage with a radius greater than 35 km.