ZTE Corporation ZXG-BTS2 Manuale Utente
Chapter 3 - Interfaces and Communications
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SACCH: Slow Associated Control CHannel, working together with a
traffic channel or an SDCCH to transmit specific information in the user
information, such as power and frame adjustment control information
information, such as power and frame adjustment control information
and measurement data; This channel can be divided into the following
types:
SACCH/TF: SACCH associated with TCH/F
SACCH/TH: SACCH associated with TCH/H
SACCH/C4: SACCH associated with SACCH/C4
SACCH/C8: SACCH associated with SACCH/C8
types:
SACCH/TF: SACCH associated with TCH/F
SACCH/TH: SACCH associated with TCH/H
SACCH/C4: SACCH associated with SACCH/C4
SACCH/C8: SACCH associated with SACCH/C8
FACCH: Short for fast associated control channel, used in combination
with a TCH to carry the same signals as SDCCH, but FACCH will be
allocated only if no SDCCH is allocated. Connection is realized via the
allocated only if no SDCCH is allocated. Connection is realized via the
frame borrowed by TCH (stolen frame) to transmit such instructions as
“handover”. FACCH comes in the following types:
FACCH/F: Fast Associated Control CHannel/Full Rate
FACCH/H: Fast Associated Control CHannel/Half Rate;
TCH/F and SACCH are generally allocated in pairs. The combination of
“handover”. FACCH comes in the following types:
FACCH/F: Fast Associated Control CHannel/Full Rate
FACCH/H: Fast Associated Control CHannel/Half Rate;
TCH/F and SACCH are generally allocated in pairs. The combination of
TCH/F and SACCH is represented as TACH/F.
3. Channel Combination
In practice, logic channels of different types are usually mapped to the
same physical channel, which is called channel combination.
Following are nine channel combinations:
i. TCHFull (Traffic CHannel Full-rate): TCH/F + FACCH/F + SACCH/TF
ii. TCHHalf (Traffic CHannel Half rate): TCH/H (0, 1) + FACCH/H (0, 1)
same physical channel, which is called channel combination.
Following are nine channel combinations:
i. TCHFull (Traffic CHannel Full-rate): TCH/F + FACCH/F + SACCH/TF
ii. TCHHalf (Traffic CHannel Half rate): TCH/H (0, 1) + FACCH/H (0, 1)
+ SACCH/TH (0, 1)
iii. TCHHalf2 (Traffic CHannel Half rate 1): TCH/H (0, 0) + FACCH/H (0,
1) + SACCH/TH (0, 1) + TCH/H (1, 1)
iv. SDCCH (Stand-alone Dedicated Control CHannel): SDCCH/8 (0, …,
7) + SACCH/C8 (0, …, 7)
v. MainBCCH (Main Broadcasting Control Channel): FCCH + SCH +
BCCH + CCCH
vi. BCCHCombined (Broadcasting Control CHannel Combined): FCCH +
SCH + BCCH + CCCH + SDCCH/4 (0, …, 3) + SACCH/C4 (0, …, 3)
vii. BCH (Broadcasting CHannel): FCCH + SCH + BCCH
viii. BCCHwithCBCH (Cell Broadcasting CHannel): FCCH + SCH + BCCH
viii. BCCHwithCBCH (Cell Broadcasting CHannel): FCCH + SCH + BCCH
+ CCCH + SDCCH/4 (0, …, 3) + SACCH/C4 (0, …, 3) + CBCH
ix. SDCCHwithCBCH (Slow Dedicated CCH): SDCCH + SACCH + CBCH
Among the above channel combinations, CCCH = PCH + RACH +
AGCH.CBCH: Only downlink channels are available, carrying cell
AGCH.CBCH: Only downlink channels are available, carrying cell
broadcast information and sharing the physical channel with SDCCH.
Each cell broadcasts an FCCH and an SCH. The basic combination in
the downlink direction includes an FCCH, an SCH, a BCCH and a
Each cell broadcasts an FCCH and an SCH. The basic combination in
the downlink direction includes an FCCH, an SCH, a BCCH and a
CCCH (PCH + AGCH), allocated strictly to TN0 of BCCH carrier
configured for a cell, as shown in Figure 18.
configured for a cell, as shown in Figure 18.