Control Channel Selection; Registration - Motorola ST7000 Product Information Manual

MN002955A01-AA
Chapter 2: Services and Features
3 A frequency range specification, using a specific offset, that can be preprogrammed in the factory.
The system operator can modify this range using the programming tool. Then the radio scans all
frequencies in 25 kHz intervals in the specified range.
4 An extra frequency range specification. Having two separate range specifications allows for two
non-contiguous blocks of frequencies or two different offsets.
The radio can use all four frequency lists to speed up registration process after a power cycle or loss of
Trunked Mode Operation (TMO) coverage.
2.14.2

Control Channel Selection

Each TDMA frame on a given carrier comprises of four time slots, which any slot can be used as a
physical channel.
The following types of physical channels are available:
• Traffic physical (TP) channel - used primarily for circuit call traffic.
• Control physical (CP) channel - dedicated only for signaling.
• Packed Data Control (PDCH) channel - dedicated for Packet Data traffic.
• Unallocated physical (UP) channel.
The following types of control channels are available:
• Main Control Channel (MCCH) - occupies the first slot of the main carrier.
• Secondary Control Channel (SCCH) - can be used to extend Control Channel capacity.
The following types of SCCH are available:
• Common SCCH
• Assigned SCCH
In addition to the MCCH, a cell can have up to three common SCCHs, which could occupy slots 2, 3,
and 4 in the main carrier. This solution allows the radio to distribute its population among up to four
channels and so to increase Control Channel capacity at the expense of traffic channel capacity.
Until having received a specific parameter on a cell, the radio uses the MCCH. When the signal is
received, each radio maps itself to a particular common SCCH, and that SCCH operates as the MCCH
for the radio.
Secondary Control Channel (SCCH) is a paid feature.
2.14.3

Registration

On camping on a cell, the radio sends a registration request PDU to the SwMI, which includes a
request to attach to the selected talkgroup.
If the registration and attachment succeed, the radio begins normal operation on the cell. If the
registration attempt times out, or the SwMI rejects the registration for a temporary reason, another
registration attempt is made. If both attempts fail, the radio attempts to camp on a different cell.
If the SwMI denies the registration request due to the location area rejection, the radio does not
attempt to register again at this cell until the next power-on. The radio supports the modification of its
subscriber class on receipt of a new subscriber class from the SwMI in the registration
acknowledgment PDU. This subscriber class is used until turning off the radio or next Individual
TETRA Subscriber Identity (ITSI) attach.
The radio does not send registration signaling when one of the following occurs:
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