ZTE Corporation ZXG-BTS2 Benutzerhandbuch
Chapter 4 - System Functions
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The TRM software is stored in the FLASH memory on the FUC board. After
the DSP is restarted, the FUC software loads the CHP software to the CHP
and CIP through the HPI interface.
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. The CMM divides the software versions into message segments and
sends them to the FUC one by one.
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
Configured into a super-large cell, theoretically, it can support the ultra
distance cell with a coverage radius of up to 120 km.
According to the GSM protocol, the maximum access radius of the GSM
system is 35 km, and the corresponding time advance (TA) is 63. Some
system is 35 km, and the corresponding time advance (TA) is 63. Some
application cases, however, require a coverage radius of larger than 35
km(i.e. time advance is greater than 63), such as ocean and islands,
km(i.e. time advance is greater than 63), such as ocean and islands,
desert and rare route area.
When the coverage radius is larger than 35 km, the MS should support a
time advance > 63. However, the GSM900 MS can only recognize the time
advance of up to 63. It is impractical to upgrade the great number of
advance of up to 63. It is impractical to upgrade the great number of
existing MSs, so the BSS should be upgraded to break the 35 km
limitation.
limitation.
The system implementation plan is: To implement the functions of one
channel by using two timeslots. In this way, the software processing may
guarantee the coverage is within 0 km ~ 120 km in radius.
guarantee the coverage is within 0 km ~ 120 km in radius.
In the case the GSM900 system has a coverage of larger than 35 km in
radius, when an MS sends a channel request, the access burst pulse
radius, when an MS sends a channel request, the access burst pulse
received at the BTS side will cross two timeslots, so the control channel
needs two physical channels, which are two continuous timeslots.
needs two physical channels, which are two continuous timeslots.
The maximum timing advance of the MS on a wireless interface is 63.
When the air delay is greater than 63, the time when the signal arrives at
the BTS will cross two timeslots, as shown in Figure 72. As a result, the
When the air delay is greater than 63, the time when the signal arrives at
the BTS will cross two timeslots, as shown in Figure 72. As a result, the
dedicated control channel and service channel need two adjacent physical
channels too.
channels too.