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Chapter 10, TIA/EIA-136 Basics
Basic Functions of the DCCH in TIA/EIA-136
TIA/EIAa TIA/EIA-136 Basics
Handoffs and
Mobile Assisted
Handoff (MAHO)
There are several types of handoffs possible within TIA/EIA-136. These are listed
below.
•DTC to DTC
• DTC to AVC
• AVC to DTC
• AVC to AVC
Basic steps in all handoffs
1. Start in Conversation task
2. Base station sends a handoff message
3. Mobile acknowledges
4. Mobile tunes to new channel and starts transmitting
5. Timing is aligned
6. End Handoff by re-entering Conversation mode
Table 8
Handoff
Direction
DTC to DTC DTC to AVC AVC to DTC AVC to AVC
Start Start in Conversation mode
Send Handoff
message(s)
Contains new
channel,
timeslot, DVCC
Contains new
channel
Word 1:
message type,
DVCC
Word 1:
message type,
AV C
Word 2: new
channel, DMAC
Word 2: new
channel, DMAC
Acknowledge Acknowledge
handoff
message
Acknowledge
handoff
message
Send ST for 50
msec.
Send ST for 50
msec.
Transmit Normal or
shortened bursts
SAT Shortened
bursts
SAT
Time
alignment
Typically set to
Standard Offset
Reference
(SOR)
Typically set to
Standard Offset
Reference
(SOR)
End Handoff Enter Conversation mode