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Data Configuration Reference − Network Planning Parameters
M900/M1800 Base Station Controller Table of Contents
Huawei Technologies Proprietary
i
Table of Contents
Chapter 1 Foreword....................................................................................................................... 1-1
1.1 Types of Radio Parameter Adjustment.............................................................................. 1-2
1.2 Prerequisites for Radio Parameter Adjustment ................................................................. 1-2
1.3 Points for Attention in Radio Parameter Adjustment ......................................................... 1-3
Chapter 2 Data Configuration ...................................................................................................... 2-1
2.1 Local Office........................................................................................................................ 2-1
2.1.1 BSC Cell Table........................................................................................................ 2-1
2.1.2 Frequency Hopping Data Table .............................................................................. 2-4
2.1.3 Radio Channel Configuration Table........................................................................ 2-7
2.2 Site..................................................................................................................................... 2-9
2.2.1 Carrier Configuration Table..................................................................................... 2-9
2.2.2 Antenna and Feeder Configuration Table............................................................. 2-10
2.3 Cells................................................................................................................................. 2-11
2.3.1 System Information Table ..................................................................................... 2-11
2.3.2 Cell Configuration Table........................................................................................ 2-30
2.3.3 Cell Allocation Table ............................................................................................. 2-34
2.3.4 BA1 Table.............................................................................................................. 2-35
2.3.5 BA2 (SACCH) Table ............................................................................................. 2-35
2.3.6 Cell Attribute Table................................................................................................ 2-36
2.3.7 Cell Alarm Threshold Table................................................................................... 2-50
2.3.8 Cell Call Control Table .......................................................................................... 2-52
2.3.9 Cell Call Control Parameter Table ........................................................................ 2-57
2.3.10 Cell Module Information Table ............................................................................ 2-63
2.4 Handover ......................................................................................................................... 2-64
2.4.1 Handover Control Data Table ............................................................................... 2-65
2.4.2 Cell Description Table ........................................................................................... 2-72
2.4.3 External Cell Description Table............................................................................. 2-76
2.4.4 Neighboring Cell Relation Table ........................................................................... 2-76
2.4.5 Filter Data Table.................................................................................................... 2-77
2.4.6 Penalty Table ........................................................................................................ 2-79
2.4.7 Emergency Handover Table ................................................................................. 2-81
2.4.8 Load Handover Data Table................................................................................... 2-84
2.4.9 Normal Handover Data Table ............................................................................... 2-86
2.4.10 MS Fast Moving HO Data Table ......................................................................... 2-89
2.4.11 Intra-cell Handover Data Table ........................................................................... 2-90
2.4.12 GSM0508 Handover Table ................................................................................. 2-91
2.4.13 Concentric Cell Handover Table ......................................................................... 2-91

M900/M1800 Base Station Controller Table of Contents
ii
2.5 Power Control ................................................................................................................ 2-100
2.5.1 Power Control Selection Table............................................................................ 2-100
2.5.2 Ordinary Cell PC Table ....................................................................................... 2-101
2.5.3 BTS Power Control Data Table........................................................................... 2-104
2.5.4 MS Power Control Data Table ............................................................................ 2-107
2.5.5 HW II Power Control Data Table......................................................................... 2-110
2.5.6 Table of BTS Power Control Data (AMR) ........................................................... 2-118
2.5.7 Table of MS Power Control Data (AMR)............................................................. 2-121
2.5.8 Table of Power Control Data for Huawei II (AMR).............................................. 2-124
2.6 Channels........................................................................................................................ 2-132
2.6.1 Radio Channel Management Control Table........................................................ 2-132
2.6.2 HW II Channel Allocation Table .......................................................................... 2-136
Chapter 3 BCCH participate in FH Data Configuration.............................................................. 3-1
3.1 Overview............................................................................................................................ 3-1
3.2 Data Configuration............................................................................................................. 3-1

M900/M1800 Base Station Controller Chapter 1 Foreword
1-1
Chapter 1 Foreword
GSM9001800 BSS Network Planning Parameters ReferenceV3.2 is for Huawei’s
GSM BSC 06.1120A version. The difference from the former version is referred to
Chapter5.
The GSM system can be divided into three parts in physical structure of the network:
the network subsystem (NSS), the base station subsystem (BSS), and the MS (MS).
In the signaling structure, the GSM system –consists of MAP interface, A-interface
(interface between MSC and BSC), Abis interface (interface between BSC and BTS)
and Um interface (interface between BTS and MS). All these entities and interfaces
have plenty of configuration parameters and performance parameters. Some of them
have already been determined during the equipment development stage. Most are
determined by the network operators as according to the actual requirements and
actual running. The settings and adjustments of those parameters have considerable
impacts on the operation of the whole GSM network. Therefore, network optimization
is the process of settings and adjustments of various parameters.
The GSM network has parameters related to radio devices and radio interfaces that
can impact the network performance. The radio parameters in the GSM network refer
to those related to radio devices and radio resources. These parameters have vital
impact on the coverage, distribution of signaling flow and network performance. Thus,
adjustment of radio parameters is an important part of the optimization.
The GSM radio parameters can be divided into two types as according to the service
targets of the radio parameters, i.e., engineering parameters and resource
parameters. The engineering parameters are related to engineering design,
installation and commissioning such as antenna height, antenna direction, antenna
gain, antenna downtilt and cable attenuation. These parameters must be determined
during network design. These parameters can hardly be changed during network
operation. The resources parameters refer to those related to the configuration and
usage of radio resources. They are normally transmitted on Um interface to keep the
consistency between the base station and MS. Most resources parameters can be
dynamically adjusted through certain man machine interfaces (MMI) during network
operation. The radio parameters involved in this document are mainly radio resources
parameters (unless otherwise specify, the parameters described here are radio
resources parameters).
When an operator is to construct a mobile communications network, he must first
make engineering design according to geographic environments, service forecast,
radio channel features, and etc. The design should include network structure design,

1-2
base station location selection and frequency planning. During the network operation,
the operator may need to adjust the network configurations and parameters so as to
improve network performance. This is an important part of the whole network
optimization process.
Radio parameter optimization is a process to improve the communication quality, the
network performance, and the equipment utilization rate by adjusting the partial or
global radio parameters as according to the actual radio channel features, traffic
features, and signaling flow bearing. The basic principle of radio parameter
adjustment is to make full use of existing radio resources, balance the global traffic
and signaling flow through load-sharing so as to achieve a better network
performance.
1.1 Types of Radio Parameter Adjustment
There are two types of radio parameter adjustment. The first type of Radio
Parameter Adjustment is to solve static problems as according to the actual average
traffic and signaling flow. The other type of Radio Parameter Adjustment is to solve
problems in traffic overloading and channel congestion.
For the first type of adjustment, the operator has to test the actual running of the
network periodically. On the basis of the test results adjust the global or partial
network parameters and configurations. While for the second type of adjustment, the
operator needs to adjust some radio parameters – as according to the real-time driver
test and the traffic statistics data. This document describes the meaning of the
parameters and analyses the impact of parameter adjustment on the whole network
performance.
1.2 Prerequisites for Radio Parameter Adjustment
The network operator must know the meaning, adjustment method and the result of
the adjustments of each radio network parameter. The network operator should be
very experienced in the radio network parameters. This is a necessary condition to
adjust radio network parameters effectively. Meanwhile, the adjustment of radio
parameters depends on many testing data during network operation. Generally, these
data can be obtained in two ways. Firstly, the statistical data can be obtained from the
Operation Maintenance Center (OMC) such as the load of CCCH, RACH channels.
Secondly, other data such as the coverage, and the MS speech quality, should be
obtained from actual measurements and tests. Therefore, frequent and long-term
measurements of various network features are necessary for effective radio
parameter adjustment.

1-3
1.3 Points for Attention in Radio Parameter Adjustment
In the GSM system, many radio network parameters are set on the basis of cells and
local areas (LA). As inter-region parameters are often strongly interrelated, during
adjustment of those parameters, consideration must be given to the impact on other
areas, especially on neighboring cells. Otherwise, parameter adjustment will bring
about negative consequences.
Besides, when a problem occurs in a region, make sure whether it is caused by
equipment faults (including connection failure). Only when it is confirmed that network
problems are caused by service causes then radio parameter adjustment is
performed. The radio parameter adjustments recommended in this document assume
that no device problems exist.

M900/M1800 Base Station Controller Chapter 2 Data Configuration
2-1
Chapter 2 Data Configuration
2.1 Local Office
2.1.1 BSC Cell Table
Cell system type
Range: GSM900, GSM1800, GSM900/GSM1800, PCS1900, GSM850
Unit -
Default: GSM900
Description: M900/M1800 BSC supports both the independent and hybrid
network structures of both 900M and 1800M. The frequency band
can be set as "GSM900". Or "GSM1800", or GSM900/GSM1800 as
according to the actual situation.
Huawei M900/M1800 BSC supports the networking of PCS1900M,
GSM850M, the hybrid networking of GSM900 and PCS1900, and
the hybrid networking of GSM850 and GSM900/GSM1800.
It does not support the hybrid networking of 1900M and 1800M..
Hybrid cell possesses the following features in respect of data
configuration:
1, Hybrid cell supports both M900 and M1800.
2, Hybrid cell must also be concentric cell.
3, Primary BCCH channel, combined BCCH channel / BCCH +
CBCH channel and BCH channel configured on different TRXs
must be in OverLaid subcell. TRXs in the same frequency band
with the TRX that the BCCH is configured on are also in OverLaid
subcell, and the other TRXs are in UnderLaid subcell.
4, SDCCH and some data service relative channel (dynamic PDCH
and static PDCH) must be configured on TRXs in OverLaid subcell.
5, A cell can not be configured as hybrid cell if it is configured as
2-timeslots extension cell and vice versa. But no such restriction is
presented for other normal cells or single-timeslot extension cell.
6, In hybrid cell, M900 and M1800 can not be in the same
frequency hopping group simultaneously.
Sub cell type

2-2
Range: Normal, upper layer and lower layer.
Unit -
Default: "normal"
Description: Use to determine a cell class in a hierarchical structure so as to
differentiate macro-cell, micro-cell, and to realize load-sharing and
inter-layer handover.
cell class
Range: Medium layer, upper layer, and lower layer.
Unit -
Default: "upper layer"
Description: Use to determine a cell class in a hierarchical structure so as to
differentiate macro-cell, micro-cell, and to realize load-sharing and
inter-layer handover.
BCC
Range: 0–7
Unit -
Default: -
Description: BCC is Base Station Color Code. It is used to distinguish among
neighboring cells with the same BCCH frequency. In cells that use
frequency hopping, the TSC in the frequency hopping data table
must be configured to be consistent with the BCC in the cell.
Regarding the protection against co-channel interference, the MS
reports the BCC value so that the BSC can distinguish among
different cells transmitting on the same frequency. For this purpose
the BCC must be allocated as wisely as possible. If frequency
reuse clusters are used then it is recommended that all BTSs in a
given cluster use the same BCC. In this way the reuse distance of
a certain BCC can be maximized according to the frequency reuse
distance.
Note that only 8 different values (BCC: 0 to 7) are used for the
purpose of recognizing co-channel interference.
Note: 1. After modify the BCC of the cell, you shall modify the TSC in the
frequency hopping table correspondingly.
2. Known by the transmit end and the receive end, the TSC is used
to locate the position of other bits in the same bust and judge
whether the received signals of the same frequencies are valid. The
burst that is no consistent with the known TSC cannot be decoded.
3. According to the GSM protocols, the TSC must be the same with
the BCC regarding the broadcast and common control channels.
For the TCH channel, the BCC is not required to be the same with
the TSC. But many manufacturers sets the BCC and the TSC same

2-3
by force (including for TCH channel). Therefore, it is recommended
to set BCC=TSC in actual data configuration.
4. Common BCCH frequency and common BSIC causes the
following problems:
1) In the RACH, the NCC and BCC of the target cell are used to
read the meaning of the access information. If there are common
frequencies and common BSICs, th random access information
(including handover access) may be processed in the non-serving
cell in case of over-cell coverage. This leads to the SDCCH
allocated abnormally or congested.
2) Common BCCH frequencies and common BSICs may also
cause the error handover judgment. Although two cells are not
defined as neighbors, if they have the common BCCH frequency
and common BSIC, MS may handover to the cell due to its strong
signals.
3) When the TCH co-channel interference or the frequency hopping
co-channel interference occurs, the TSC (same with BCC) in the
TCH is an important criterion to judge the useful voice frame and
useless voice frame. Therefore, reasonable BCC planning can
reduce the interference’s effect on voice.
5. The BCC planning priciples: keep the common BCCs far away
from each other. Keep the common BCCH frequencies and
common BSICs far away from each other
The specific requirements are as follows:
1) In the frequency planning, especially the 1X1 and 1X3 fruqency
hopping nework planning, the probability o the TCH frequency
interference is high. Therefore, when plan the BCC, set eight bas
station as a cluster and one base station uses one BCC.
2) Any frequency planning shall meet the principles of keeping
common BCCH frequencies and common BSICs far away from
each other. When the BCCH frequencies are the same, try to set
the BSICs different. If conflict with the BCC planning principles, try
to modify the NCC to avoid the common frequency and common
BSIC when NCC can be modified.
NCC
Range: 0–7
Unit -
Default: -
Description: The NCC is Network Color Code. It is used to discriminate
networks in different areas. It is a uniform code over the whole
country.
The color code NCC is then used to discriminate cells that use the
same frequency. Though mainly intended for the purpose of
differentiating PLMNs, it also serves to distinguish cells within one
PLMN that use the same frequency provided they have been

2-4
assigned different NCC.
What is stated here should be considered as general guidelines. Of
course any type of NCC assignment must be decided by
agreements between operators and countries.
CGI
Range: MCC: 3 digits (Mobile Country Code).
MNC: 2 or 3 digits (Mobile Network Code).
LAC: 1 to 65535 (Location Area Code).
CI: 0 to 65535 (Cell Identity).
Unit -
Default: -
Description: Cell global identifier. CGI = MCC + MNC + LAC + CI. It should be
noted that the classification of LAC has a significant effect on
increasing signaling load and call completion rate.
Note: In Huawei system, LAC and CI should be in hexadecimal format.
CGI is sent to the mobile station (MS) as a part of the system
information message (GSM Rec. 04.08). The combination
MCC-MNC-LAC is also known as the location area identity (LAI).
Support GPRS
Description: Indicating whether the GPRS function is supported. It should be
noted that the GPRS function needs the support of the base
station.
Range: Yes, No
Unit
Default: No
Note: For base station versions that don't support the GPRS function and
cells that do not provide the GPRS service, the value must be set
to No. Otherwise, some mobiles cannot access to the network.
2.1.2 Frequency Hopping Data Table
Huawei’s GSM supports RF frame/baseband frame/timeslot hopping. The list is as
follows:

2-5
BTS series
RF
hopping
Baseband
hopping
Timeslot
hopping
Frame
hopping
BCCH
participating
in baseband
hopping
BTS2X Y N N Y N
BTS3X Y Y Y Y Y
BTS22C Y N N Y N
BTS3001C
(1TRX)
N N N N N
BTS3001C
(2TRX)
Y N N Y N
BTS3002C Y N Y Y N
FH index No.
Range: 0–65535
Unit -
Default: -
Description: Internal index number providing an association between the radio
channel configuration table and the frequency hopping data table.
Note: For data configuration when BCCH joins in baseband
timeslot frequency hopping, please refer to the matching materials
(Data configuration when BCCH is involved in frequency hopping).
MA
Range: -0−1023
Unit -
Default: -
Description: The MA is a set consisting of a maximum of 64 hopping
frequencies. These frequencies must be those in the cell allocation
table.
Note: MA is a set consisting of a maximum of 64 hopping frequencies.
These frequencies must be those in the cell allocation table. MA of
RF hopping cannot include the frequency of BCCH. But if BCCH
participates in frequency hopping (baseband/timeslot FH), MA in
other timeslots can include the BCCH frequency except the timeslot
0 of hopping TRX (when extended BCCH is configured, its’
corresponding timeslot should be excluded)
Frequency hopping algorithm:
If it is FH, calculate the frequency to be used by invoking FH
algorithm as per hopping frequency set (Radio channel

2-6
configuration table and Frequency hopping data table) in the
channel property settings.
Judge whether it is baseband frequency hopping.
If it is baseband frequency hopping, find out the TRX NO to be
used for the frequency calculated just now as per the
correspondence between FH frequency and TRX NO (TRX
configuration table).
So, the correspondence between hopping frequency and TRX NO
in TRX configuration table is only used in base band frequency
hopping.
While the correspondence between hopping frequency and TRX
NO. is not suitable for RF hopping.
When use cyclic frequency hopping and DTX at the same time, the
frequency number N cannot be the multiple of 13. Otherwise, most
of the SACCH frames are sent and measured in the same
frequency. This affects the accuracy of the measurement report
carried by the SACCH frame in the active mode.
HSN
Range: 0–63, (HSN = 0 cyclic hopping sequence, HSN = 1 to 63 pseudo
random) sequences. HSN should be the same for all the channels
in one cell. MS can not access if HSN is greater than 63.
Unit -
Default: -
Description: Hopping sequence number, it should be consistent with the 64
types of FH sequence.
TSC
Range: 0–7.
Unit -
Default: -
Description: Training sequence code. In cells that use FH, TSC must be set to
be the same as the BCC in the cell. Otherwise, the TCH channels
cannot be properly occupied.

2-7
Note:
For base band FH, the parameter “TRX Aiding Function Control” in the [cell
configuration table] must be set to “Allowed & Recover When Check Res.” In the
G3BSC32.10100.06.1120A and later version.
If there is faulty TRX in FH group and the base band FH must be opened, the faulty
TRXs must be removed from the FH group.
When cycling FH and DTX are used together, the number of frequencies cannot be a
multiple of the 13. Otherwise, most SACCH frame will be sent and measured on the
same frequency, which affects the accuracy of the measurement reports contained in
the SACCH.
2.1.3 Radio Channel Configuration Table
MAIO
Range: 0–N-1, N is the number of frequency in MA.
Unit -
Default: -
Description: Mobile Allocation Index Offset. In frame that uses FH, the same
MAIO is recommended for all channels of a TRX and different
MAIO for different TRX in the same cell. The primary policy is to
guarantee that the MAIO of the same timeslot of different TRX that
use the same HSN and MA in synchronized cells are not the same.
This is to avoid the co-frequency collision. In timeslots that use FH,
the MAIO of various channels of the same TRX can be configured
differently.
CH type
Range: TCH full rate, TCH half rate 01, TCH half rate 0, SDCCH8, Main
BCCH, Combined BCCH, BCH, BCCH+CBCH, SDCCH+CBCH,
PBCCH+PDTCH, PCCCH+PDTCH, PDTCH, Dynamic PDTCH
Unit -
Default: When configure more than one SDCCH, divide the SDCCHs
equally. The main BCCH TRX can’t configure more than 2 SDCCH.
A TCH TRX can configure 2 SDCCH at most, and if in 16K mode
and MR. Pre-process was disabled, one SDCCH can be configured
at most. In the place where has much paging, think to not configure
SDCCH on main BCCH TRX.
Description: Indicating the channel type and the function of each timeslot of all
carriers in a cell. Every cell is configured with a BCCH carrier.
Generally, the TRX ID of BCCH is fixed to be the smallest TRX ID
in the cell. The ordinary channel combinations of BCCH carrier are

2-8
as follows:
Combinations:
BCCH+7TCH
Main BCCH+SDCCH/8+6TCH
Main BCCH+2SDCCH/8+5TCH
Main BCCH+SDCCH/8+ extended BCCH(BCH)+5TCH
Main BCCH+SDCCH/8+ extended BCCH(BCH)+TCH+ extended
BCCH(BCH)+3TCH
Note: 1) The configuration of BCCH in a cell should be done appropriately
according to the channel number of the cell and the paging
capability in a LAC.
2) The main BCCH and combined BCCH are configured in timeslot
0, and extended BCCH channel can be configured only in timeslots
2, 4, and 6. After extended BCCH channels are configured, the
CCCH configuration parameters in the system information table
should be configured accordingly. For example, if an extended
BCCH is configured in timeslot 3) then in the system information
table, CCCH should be configured into 2 non-combined CCCHs.
3) If the cell broadcast function is available, SDCCH+CBCH instead
of SDCCH8 can be configured, or SDCCH+CBCH instead of a TCH
can be configured. If the CBCH of SDCCH/4 is adopted, their
channel type can be configured to be BCCH+CBCH.
4) For 1 to 2 TRX, one SDCCH/8 is configured; for 3 to 4 TRX, 2
SDCCH/8 s are configured; for 5 to 6 TRX, 3 SDCCH/8 s are
configured. Meanwhile, the dynamic SDCCH allocation function
should be enabled and work properly.
Half-rate networking possesses the following features different from
other networking modes.
1, Half-rate mode, a channel configured as half-rate TCH includes
two half-rate sub-channels and must occupy two trunk circuits. A
channel configured as full-rate TCH includes only one full-rate
channel and occupies one trunk circuit, but it must also be
configured with two trunk circuits in order that the full-rate TCH can
be converted dynamically into half-rate TCH. Before the
adjustment, the latter trunk circuit is idle, and after the adjustment,
both the trunk circuits are allocated to the two half-rate
sub-channels. For other channels requiring trunk, they must also be
configured with two trunk circuits, otherwise, all affected channels
must be modified after channel type is modified dynamically.
2, In half-rate mode, multiplexing ratio of Abis interface LAPD
signaling link can be up to 2:1 as RSL signaling flow of each TRX
increases.
3, In half-rate mode, an E1 can support a maximum of 13 TRXs
(less than 13 TRXs if LAPD signaling link does not support
multiplexing.)
4, In half-rate mode, each BIE can support a maximum of 17 TRXs

2-9
(less than 17 TRXs if LAPD signaling link does not support
multiplexing.)
5, In half-rate mode, if BTS supports BIE crossover connection, the
BIEs crossed over must be in half-rate networking mode.
6, In half-rate mode, 256 HW timeslots of the BS1 interface are
numbered sequentially. Service channels are allocated in the order
of from the timeslot 0 to the timeslot 255. While OML and RSL are
allocated in the order of from the timeslot 255 to the timeslot 0.
7, For a BIE group configured as half-rate networking mode, all
BTS data must be modified based on this rule.
8, In half-rate data configuration, 34BIE and 13FTC (HR
version)/14FTC must be used. Otherwise, either 32BIE or 34BIE
can be used as BIE, and either 12FTC or 13FTC can be used as
FTC.
2.2 Site
2.2.1 Carrier Configuration Table
Static TRX Power class
Range: 0–13
BTS versions:
BTS3X support the static power setting of levels 0–10.
BTS2X support the static power setting of levels 0–10.
BTS22C support the static power setting of levels 0–13.
Unit -
Default: 0
Description: Power class "0" shows that power is in its maximum. Each class is
2 dB less than its former class.
Note: Cells can be enabled to sufficiently carry traffic by setting the
"power class" parameter. If antennas are so high that they result in
serious cross-cell overlapping, the primary solution is to lower the
antenna height and increase the antenna downtilt. Reducing the
BTS power output will deteriorate indoor coverage.
The ARFCNs must be the subset of the CA.
Generally, for cells with the same priority in the network, their power
class setting should guarantee that the EIRP of every cell is

2-10
basically the same.
During power class setting, it should be noted that different
combining modes might result in the different power losses.
If FH is not enabled, only the first one among all ARFCNs in the
carrier configuration table is valid.
BSC06.1120 and later version can support EGSM/RGM band.
Carrier power type
Range: 40 W, 60 W,Default
Unit -
Default: Default
Description: Used to configure the carrier type, which is used to distinguish
carriers with different powers.
HW-IUO property
Description: Indicating whether TRX should be configured as OverLaid or
UnderLaid subcell.
Range: OverLaid subcell, UnderLaid subcell, None
Unit -
Default: -
Note: In the cell with single TRX but dual timeslot, the HW-IUO property
of the TRX shall be configured as OverLaid.
TRX priority
Description: The priority of TRX (valid in HW_II channel allocation algorithm
only.).
Range: Level 0–Level 7
Unit -
Default: Level 0
2.2.2 Antenna and Feeder Configuration Table
Tower-mounted amplifier flag
Range: With tower-mounted amplifier, Without tower-mounted amplifier
Unit -

2-11
Default: -
Description: Weather to use Tower-mounted amplifier.
Power attenuation factor
Range: 0–255
Unit -
Default: The configuration depends on the feeder cable length.
Configuration methods are as follows:
The BTS2.x adopts non-CDU mode; this parameter is fixed as 10.
In the case that BTS (including 2.0 and 3.0 base stations) adopts
CDU, CDU gain should be adjusted according to the two
parameters described above.
Uplink: according to whether the tower-mounted amplifier is used:
Description: Use to compensate the amplifier’s gain.
Tower-mounted
amplifier flag
Power attenuation factor Description
With tower-mounted
amplifier
Tower-mounted amplifier
gain –feeder cable loss = 12
– 4 = 8 dB
Triplex tower amplifier gain:
12.
Duplex tower amplifier gain:
14
Simplex tower amplifier gain:
14
Assuming that feeder loss:
4dB
Without
tower-mounted
amplifier
0
Downlink: Without tower-mounted amplifier, power attenuation factor is set to be
255.
2.3 Cells
2.3.1 System Information Table
System information
Range: 1–12. 2bis, 2ter, 5bis, 5ter, 10bis

2-12
Unit -
Default: 1–6. 2bis, 2ter, 5bis, 5ter
Description: Use to determine whether to use a certain type of system
information. The system information is broadcasted from BTS to
MS. The system information informs all MS of the cell the
information about LAC, CGI, CA, available HSN, channel allocation
and random access control. This helps MS to locate network
resources quickly and accurately. 2bis and 5bis are used for the
1800 network, and 2ter and 5ter are used for the 900/1800
dual-band network. For detailed system information definitions,
please refer to Protocol 0408 and system information training
materials.
Regular transmission
Range: Yes, No
Unit -
Default: Yes
Description: Indicating whether BSC regularly updates the system information
sent by BTS. If it is set as "Yes", BSC updates the system
information being sent by BTS every interval (the interval is
determined by regular transmission interval).
Regular transmission interval
Range: 0–255
Unit -
Default: 10
Description: The interval for BSC to retransmit system information to BTS.
MS MAX retrans
Range: 1, 2, 4, 7
Unit times
Default: -
Description: The maximum times for MS being allowed to send the "Channel
Request" message during one immediate assignment process.
After the immediate assignment process starts, MS will keep
monitoring BCCH and CCCH information. If the MS does not
receive an Immediate Assignment or Immediate Assignment
Extend command, MS will keep retransmit ting the channel request
message at every certain interval. The greater is this parameter, the
higher the call attempt success rate, the higher call completion rate
and the greater the load on RACH and SDCCH. See Protocol
0408.

2-13
Note: 1) The bad downlink quality might cause an MS to send SABM
message to BTS multiple times.
2) For areas where the cell radius is more than 3 kilometers and
there is a less traffic (normally the suburb or rural areas), M can be
set as 11 (i.e., the maximum retransmission times is 3) so as to
raise MS access success rate
3) For areas where the cell radius is less than 3 kilometers and
there is an average traffic (generally, it refers to the less busy urban
areas), M can be set as 10 (i.e., the maximum retransmission times
is
4) For microcell areas and obviously congested cells with a large
traffic, M is recommended to be set as 00 (i.e., the maximum
retransmission times is 1).
5) For satellite transmission BTS, M is recommended to set to be
equal to or greater than 4.
Common access control class
Range: Level 0–9 forbidden
Unit -
Default: 000000000
Description: Use to control load and to permit or forbid the network access of
users at certain common access levels.
Defines which access classes that are barred. Up to 16 access
classes can be defined.
Class 10 defines emergency call in the cell.
0 to 9 Access classes that are barred.
10 Emergency call not allowed for MSs belonging to classes 0 to
9.
It may be of interest to the operator to bar the access to the system
to a certain type of MS. For this purpose it is possible to define up
to 16 different access classes of MSs and then select the classes
that can not access a cell by means of ACC (GSM 04.08, section
10.5.2.17).
The classes are defined according to GSM 02.11. Classes 0 to 9
are reserved for the operator to be used for normal subscribers
(home and visiting subscribers).
Special access control class
Range: Level 11–15 forbidden
Unit -
Default: 00000

2-14
Description: Use to control load and to permit or forbid the network access of
users at certain special access levels.
Classes 11 to 15 are defined as follows:
11 PLMN use.
12 Security Services.
13 Public utilities.
14 Emergency services.
15 PLMN staff.
Cell channel description format
Range: Bitmap, 1024, 512, 256, 128, Variable-length
Unit -
Default: Bitmap
Description: The message element is a list of available absolute carrier numbers
in a serving cell. Its length is 17 bytes. To be specific, from the D3
bit of the second byte in the cell channel description to the D0 bit in
the 17th byte, there are totally 124 bits, recorded respectively as
carriers No. 124, 123, 122.3, 2, and 1. If the Nth bit is 1, then this
Nth carrier belongs to this cell.
ATT
Range: Yes, No
Unit -
Default: Yes
Description: Attach-detach allowed. ATT tells the MS if it is allowed to apply
IMSI attach and detach, i.e. if the MS is allowed to send a message
to the system every time it is turned on or off (GSM 04.08, section
10.5.2.11). For different cells in the same LAC, their ATTs must be
set to be the same.
PWRC
Range: Yes, No
Unit -
Default: Yes
Description: If BCCH carrier timeslots participate in frequency hopping, PWRC
indicate whether MS should remove the receiving level from BCCH
carrier timeslots when it calculates the average receiving level
Both MS and BTS must possess measurement function so as to
monitor RL communication quality and perform power control. But

2-15
the measurement may result in some problems when several
independent GSM functions works together. First, it is allowed by
GSM recommendations that hopping channel uses the BCCH
frequency (but not in the timeslot transmitting BCCH). Second,
downlink power control is allowed in the frequency hopping
channel. Third, power of the TRX involving BCCH can not change
since MS must measure the signal level of the neighboring cell.
Therefore, downlink power control is feasible only for a frequency
sub-set of this channel. That is, it excludes BCCH TRX used in
frequency hopping by this channel. If MS measures the average
downlink channel level in the common way, the measurement result
is incorrect for power control. So MS should remove the receiving
level from BCCH carrier timeslots when it calculates the average
receiving level during frequency hopping.
UL DTX
Range: Allowed, Mandatory, Forbidden
Unit -
Default: Mandatory
Description: Uplink DTX, Indicates whether the discontinuous uplink
transmission of MS is enabled in the last measuring period. See
Protocol 0508.
Note: Huawei GSM supports whether to enable the downlink DTX
function in BSC. For parameter setting, please refer to "Whether to
use downlink DTX" in the cell attribute table.
CBA
Range: Yes (1), No (0)
Unit -
Default: Yes
Description: Cell Bar Access. See Protocol 0408. It can be used together with
CBQ to determine the priority of cells.
It is possible to use CBA to bar a cell (GSM 03.22 and 05.08).
When a cell is barred it is ignored by MSs in idle mode but an
active MS can perform handover to it.
Note: Host provides a reverse calculation. If OMC is configured as
yes (1), CBA transmitted to MS is still yes (0), which complies with
the protocol.
”yes” and no” are used In data configuration (either data
configuration system or auto configuration system). “0” and “1” are
only set in the program.
CBQ

2-16
Unit -
Default: No
Description: Cell Bar Qualify. See Protocol 0408. It can be used together with
CBA to determine the priority of cells.
For GSM phase 2 MSs, a cell can be given two levels of priority.
This is controlled by the parameter CBQ in conjunction with CBA,
as shown in below table.
The interpretation of CBA and CBQ varies depending on whether
the MS is a phase 1 MS or a phase 2 MS. For phase 2 MSs the
behavior is also different in cell selection compared to cell
reselection.
In idle mode the MS looks for suitable cells to camp on by checking
cells in descending order of received signal strength. If a suitable
cell is found, the MS camps on it. At cell selection
With a phase 2 MS, cells can have two levels of priority, suitable
cells which are of low priority are only camped on if there are no
other suitable cells of normal priority (GSM 03.22).
CBQ CBA
Cell selection
priority
Cell reselect priority
No(0) Yes(1) Normal Normal
No(0) No(0) Barred Barred
Yes(1) Yes(1) Low Normal
Yes(1) No(0) Low Normal
Note: The value of CBA and CBQ can affect the MS access to the
system. The above table is for Phase2 MS
EC allowed
Range: Yes, No
Unit -
Default: Yes
Description: Emergency call allowed. For the MS at access level 0–9, the "Yes"
of this parameter indicates that emergency call is allowed; for MS
at access level 11–15, only when both the corresponding access
control class and this parameter are set to “Yes” then emergency
call be forbidden.
Call re-establishment allowed

2-17
Range: Yes, No
Unit -
Default: Yes
Description: Whether to allow call re-establishment. For the radio link
disconnection caused by unexpected interference or coverage of
"blind spot", MS can start the call re-establishment process to
recover the conversation. The call re-establishment takes long time,
the subscriber usually cannot wait and hang up the call. Therefore,
It is recommended not to allow the call re-establishment.
NCC permitted
Range: 0 allowed–7 allowed
Unit -
Default: 1111111
Description: Network color code permitted. The value 1 stands for permitted and
0 for forbidden. This parameter is sent in system information 2 and
6. When the cell’s NCC is consistent with the value of NCC
permitted, then this cell will be measured by MS. And MS will report
the measurement report to BTS. This parameter consists of one
byte (8bit). Each bit is corresponding to an NCC (0–7) and the last
bit is corresponding to NCC 0. If bit N is 0, then MS will not
measure the cell level with NCC being N.
Note: As MS cannot report the neighboring cell information where NCC is
set to 0, the incorrect setting of this parameter will cause MS to be
unable to hand over during conversation. See Protocol 0508.
This parameter can be used to make MS‘s measurements on some
neighboring cells optionally.
CCCH-CONF
Range: 1 combined CCCH, 1 non-combined CCCH, 2 non-combined
CCCHs, 3 non-combined CCCHs, and 4 non-combined CCCHs.
Unit -
Default: non-combined CCCH
Description: CCCH configuration.
Note: 1) Non-combined CCCH, 1 combined CCCH, 2 non-combined
CCCHs, 3 non-combined CCCHs, and 4 non-combined CCCHs. In
a corresponding BCCH multi frame, numbers of CCCH message
blocks are: 9, 3, 18, 27, and 36. CCCH configuration determines
the capacity of PCH, AGCH, and RACH. Generally, the PCH
capacity of every cell in a LAC should be consistent.
2) For the cell with one carrier, it is recommended to configure 1
combined CCCH. For the cells of other configurations, determine
the CCCH configuration as according to the carrier number. For

2-18
extended BCCH (including the main B and expanded BCCH), the
number of BCCH channels configured is equivalent to the number
of non-combined CCCHs configured.
1, BS_AG_BLKS_RES and CCCH configuration parameters will be
adjusted dynamically as per main BCCH channel 0 configuration
types.
2, If CCCH is not configured as “1 combined CCCH”, the Access
granted blocks reserved change into 2 by default, and the value of
the parameter ranges from 1 to 7. If CCCH is configured as “1
combined CCCH”, the Access granted blocks reserved in the
corresponding system message change into 1 by default, and the
value of the parameter ranges from 1 to 2.
3, If main BCCH channel 0 is configured as “combined BCCH" or
“BCCH + CBCH”, the corresponding CCCH parameter in the
system message list is configured as “1 combined CCCH”.
4, If main BCCH channel 0 is configured as “main BCCH", the
corresponding CCCH parameter in the system message list is
configured as “N non- combined CCCH”. N is the total number of
channel 0, 2, 4, 6 that are configuration as “main BCCH” and
“BCH”.
Tx-integer
Range: 3–12, 14, 16, 20, 25, 32, 50
Unit RACH timeslot (equals to a TDMA frame, 4.615ms)
Default: 20
Description: Use to determine the timeslot number of the interval between two
continuous requests when MS continuously sends multiple channel
requests. The purpose of this parameter is to reduce the number of
collisions on RACH which mainly affects the execution efficiency of
immediate assignment process. Tx-integer and the CCCH
configuration jointly determine the parameter S, as shown in the
following table.
S
Tx-integer
non combined CCCH combined CCCH / SDCCH
3. 8. 14. 50 55 41
4. 9. 16 76 52
5. 10. 20 109 58
6. 11. 25 163 86
7. 12. 32 217 115

2-19
Description: The timeslot number that MS used for sending the first channel
request message is a random value in the set of {0, 1… MAX (T,
8)-1}.
The timeslot number for the interval between any two adjacent
channel request messages (excluding the timeslots sending the
message) is a random value in the set of {S, S+1… S+T-1}. The
greater the Tx-integer, the greater the range for the interval of MS
to send channel request messages, and the lesser the RACH
collisions. The greater the S value, the greater the interval for MS
to continuously send channel request messages, and the lesser the
chance of collisions on the RACH channel, and the higher the
availability rate of AGCH and SDCCH channels. But the increase of
T and S will increase MS access duration, which leads to drop in
the access performance of the whole network. Generally, it should
be guaranteed that that no overloading occurs on the AGCH and
SDCCH channels and the S should be as small as possible.
Example
If the cell has a non combined CCCH and TX = 7 then the
interval between each retransmission may be
1 second (217 RACH slots),
1 sec. + 4.615 ms,
1 sec. + 2*4.615 ms,
…
1 sec. + 6*4.615 ms.
Note: In case of large traffic, the smaller the S+T value the lower the
immediate assignment success rate. In this case, we can adjust the
T value so that S+T is greater.
In the case of satellite transmission, this value should be 32 so as
to reduce impact of satellite transmission delay.
BS_AG_BLKS_RES
Range: 0–7 (non-combined BCCH), 0–2 (1 combined CCCH),
Unit Block
Default: 2 (non-combined CCCH), 1 (combined CCCH)
Description: Number of CCCH blocks reserved for the access grant channel.
The remaining CCCH blocks are used for the paging channel.
In each downlink non-combined SDCCH 51 frames multi-frame
there are 9 different CCCH blocks and in the combined
BCCH/SDCCH there are 3 different blocks. They can be used to:
Send paging messages, i.e. used as a Paging Channel.
Send access granted messages, i.e. used as an Access Grant
Channel.

2-20
After an MS tunes to the BCCH/CCCH channel and decodes the
System Information, it performs an evaluation that, taking into
account the MS's own IMSI (International Mobile Station Identity)
number, determines to which particular CCCH block in the physical
channel it should listen (GSM 05.02). Every CCCH in the physical
channel (Paging Sub-channel) sends paging messages to a certain
group of MSs that are called its paging group. The reason for the
existence of such paging groups is that the MSs can save batteries
because it only needs to listen to its own Paging Subchannel
messages.
The physical channel (Paging Subchannel) sends paging
messages to a certain group of MSs. As mentioned before these
very same CCCH blocks are also used to send Access Grant
messages to the MSs, i.e. to answer a Random Access message
that an MS wanting to access the system has sent to the system.
The structure of the CCCH regarding Paging messages and
Access Grant messages can be controlled by the two parameters:
BS_AG_BLKS_RES and BS-PA-MFRAMS, and the setting of this
parameter will impact on the MS paging response time and the
system service performance.
Note: It is specified in the protocol that the reserved AGCH blocks can not
be 0 in the following cases:
1) There is system message to be transmitted on Extended BCH.
2) There has been configured with CBCH channel.
3) There has been configured with NCH channel in the case of
GSMR.
BS-PA-MFRAMS
Range: 2–9
Unit CCCH multi-frames
Default: For the area with ordinary or heavy load on paging sub-channel
(the area with medium or high traffic volume in the location area),
set MFR to 6 or 7 (make 6 or 7 multi-frames as a paging group).
For the area with low load on paging sub-channel (the area with
low traffic volume in the location area), set MFR to 4 or 5 (make 4
or 5 multi-frames as a paging group). Usually, set MFR to 2.
Description: Paging Multi-frames period. Defines period of transmission for
PAGING REQUEST messages to the same paging subgroup.
Together with BS_AG_BLKS_RES, BS-PA-MFRAMS determines
the number of paging groups.
MFRMS is also used by the MS to determine downlink signaling
failure in idle mode (GSM 05.08). The downlink signaling failure
criterion is based on the downlink signaling failure counter DSC.
When the MS camps on a cell, DSC shall be initialized to a value
equal to the nearest integer to 90/N, where N is the
BS-PA-MFRAMS parameter for that cell. Thereafter, whenever the

2-21
MS attempts to decode a message in its paging subchannel; if a
message is successfully decoded DSC is increased by 1, (however
never beyond the nearest integer to 90/N), otherwise DSC is
decreased by 4. When DSC reaches 0, a downlink signaling failure
shall be declared. A downlink signaling failure shall result in cell
reselection.
Note: 1) A paging block (four continuous CCCH timeslots) can bear 2
IMSI paging or 4 TMSI paging or an AGCH immediate assignment
message.
2) The DL signaling channel is faulty in idle mode.
The DL fault principle is based on the DL signaling fault counter
DSC. While the MS remains in a cell, DSC is initiated to the nearest
number of 90/NodeB where N is BS_PA_MFRMS (the number of
frames with same paging) with the range of 2~9.
So, DSC is incremented by 1 when the MS successfully decodes a
message on its paging sub-channel. But DSC should not exceed its
initial value. If the decoding fails, DSC is decremented by 4. If DSC
<= 0, a DL signaling channel fault occurs. The DL signaling channel
fault causes a cell reselection.
3) Different settings for different types of base station.
If there is a BTS2X in the location area and the setting of this
parameter is too small, the CCCH will be over-loaded. It is
recommended to set the parameter to 5 or 6 in this case.
T3212
Range: 0–255
Unit 6 minutes
Default: 20~30 (urban), 10~20 (suburb), 8~10 (mountains)
It is advised to select a greater value for T3212 (i.e. 16h, 20h, 25h,
etc.) in the area with large traffic, while a smaller value for T3212
(i.e. 3, 2 etc.) in the area with small traffic. In order to assign T3212
with a proper value, it is necessary to perform overall and long term
measurement on the objects in the running network in respect of
their processing ability and traffic on them (processing ability of
MSC and BSC, the load of A-interface, Abis interface, Um interface,
HLR and VLR). T3212 can be assigned with a greater value once
overload occurs to any object. Time limits of periodical location
updating in VLR/BSC can be used flexibly to improve system
connection rate, increase LAC capacity while decreasing ineffective
calls.
Description: The periodical location updating timer. In VLR, there is another
parameter called the periodical location updating timer. The shorter
the periodical location updating time, the better the overall network
service performance. But, the greater network signaling load will
lower the radio resources availability rate. In addition, this will
increase the MS power consumption, so that the MS average
standby time is greatly shortened. Consider the processing ability
of MSC and BSC, the load of A-interface, Abis interface, Um

2-22
interface, HLR and VLR before setting this parameter. Generally,
the larger value should be set for the continuous coverage of urban
area and the smaller value for suburbs, rural, or blind spots.
Note: 1) In MSC, the periodical location updating timer must be greater
than the value of BSC.
2) Due to the periodical location update principle of the GSM
system, sometimes even the MS is on but no location update
request is sent for a long period, it will be identified as implicit
off-line. When the MS cell is reselected to another cell (in the same
location area), if the T3212 of the new cell is different from that of
the old cell, it will be restarted by the T3212 timeout value. If the
values of this parameter are different for the cells in the same
location area, the MS may not be able to initiate a location update
process for a long period under some situations. In this case, the
MS will be identified as “implicit off-line”. The MS will receive a
voice recording of “The phone you are calling is off line”
The parameter value of different cells that share the same LAC,
must be the same.
Radio Link Timeout
Range: 4–64, with a step-length of 4
Unit SACCH period (480ms)
Default: Area with very little traffic (remote area): 52~64
Area with less traffic or large coverage (suburbs or rural area):
36~48
Area with large traffic (urban area): 20~32
Area with very large traffic (covered by micro cells): 4~16
For those cells with blind points or the area in which the traffic is
interrupted very often, increase the value of this parameter to help
resuming the communication.
Description: See Protocol 0408 and 0508. MS uses this parameter to determine
when to disconnect the connection when SACCH decoding fails.
Once MS is assigned with SDCCH, it starts the timer S with its
initial value being this parameter. S decrements by 1 every time
when an SACCH decoding fails and S increments by 2 every time
when a SACCH decoding succeeds. If S = 0, it indicates the DL
radio link is faulty. Thus, the release or re-establishment of
connection is guaranteed to be performed on those connections
whose quality level has deteriorated to an intolerable level. But if
the parameter is too small, it will cause call-drop due to radio link
faults. While when it is too large, MS will not release the resource in
a long time, thus lowering the resources availability rate (this
parameter works for the downlink only).
MS_TXPWR_MAX_CCH

2-23
Range: 0~31
For cells of GSM900 and GSM1800, the corresponding dBm value
varies with the control level.
For GSM900, the 32 maximum transmission power control levels
are:
{39,39,39,37,35,33,31,29,27,25,23,21,19,17,15,13,11,9,7,5,5,5,5,5,
5,5,5,5,5,5,5,5}
For GSM900, the 32 maximum transmission power control levels
are:
{30,28,26,24,22,20,18,16,14,12,10,8,6,4,2,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,36,34,32}
Unit grade
Default: 5(900M), 0(1800M)
Description: The maximum MS transmitting power level. This parameter is sent
in the BCCH system information. It affects MS behavior in the idle
mode and is used to calculate C1 and C2 values so as to
determine cell selection and cell reselection.
Note: The maximum MS transmitting power level. It is sent in the system
message of BCCH to affect the MS behavior in idle mode. It is also
used to calculate the values of C1 and C2 to determine the cell
selection and reselection.
C1 = RLA_C – RXLEV_ACCESS_MIN - MAX
( ( MS_TXPWR_MAX_CCH –P), 0) where RLA_C is the average
MS receiving level, RXLEV_ACCESS_MIN is the minimum
receiving level for the MS accessing the network,
MS_TXPWR_MAX_CCH is the maximum transmitting power level
of the control channel for the MS and P is the maximum
transmitting power level of the MS.
This parameter determines the output power level adopted by an
MS when it has not received the power control command. See
Protocol 0508. The smaller this parameter, the greater the MS
output power. MS near BTS will cause great side-channel
interference to this cell, and affect the access and conversation
quality of other MS. The greater this parameter, the less the MS
output power, and this will lower the access success rate of MS at
the edge of the cell.
RXLEV_ACCESS_MIN
Range: 0–63, (-110 dBm–-47 dBm)
Unit Grade
Default: 8
Description: Minimum MS received signal level. See Protocol 0508. It indicates
the minimum receiving signal level required for MS to access the
system.
Note: If this parameter is too small, it will cause MS to access network

2-24
easily. Meanwhile, the cell load and call-drop possibility will be
increased. Therefore, consideration should be given to the balance
between uplink and downlink.
Half rate supported
Range: Yes, No
Unit -
Default: No
Description: Used in network to inform MS whether the system supports half
rate.
Huawei provides two schemes of channel rate allocation: “MSC
controlled channel rate allocation” and “BSC controlled channel
rate allocation”. Which one will be adopted depends on BTS 0 of
[Call parameter II] in Software Parameter Table of OMC data
configuration system.
[Call parameter II] BIT 0
Range: 0 and 1
Description:
”0”: MSC required rate allocation is used. That is, allocate half-rate
TCH or full rate TCH as per MSC requirements.
”1”: BSC required rate allocation is used. That is, BSC decides
whether to allocate half-rate TCH or full rate TCH first as per the
current traffic etc.
Default value: 1.
MSC controlled channel rate allocation.
MSC radio channel allocation scheme. If the type of the channel for
allocation by MSC is “only full rate” or “only half-rate”, only the
channels of complete matched rate can be allocated. If the type of
the channel for allocation is “preferred full rate”, all the channels
with full rate TCH will be allocated only if they meet the
corresponding conditions. If the type of the channel for allocation is
“preferred half rate”, all the channels with half rate TCH will be
allocated only if they meet the corresponding conditions.
In order to allocate channels completely following MSC’s
assignment during A interface interconnection test, we still adopt
the single MSC radio channel allocation scheme, although it is hard
to achieve the most satisfactory network capacity and voice quality
by this channel allocation scheme.
BSC controlled channel rate allocation.
An improvement of MSC controlled channel rate allocation. If the
type of the channel for allocation by MSC is “only full rate” or “only
half-rate”, only the channels of complete matched rate can be
allocated. If the type of the channel for allocation is “preferred full
rate” or “preferred half rate”, the full rate TCHs will be allocated first

2-25
to ensure the conversation quality if there are many idle full rate
TCHs, while the half-rate TCHs will be allocated first to ensure the
network capacity if there are a few of idle full rate TCHs.
In detail, if the Number of idle full rate TCHs > Threshold
(configured in OMC data configuration system) of preferred idle full
rate TCHs, the full rate TCHs will be allocated first. If the Number of
idle full rate TCHs < Threshold (configured in OMC data
configuration system) of preferred idle full rate TCHs, the half rate
TCHs will be allocated first.
CRH
Range: 0–14
Unit 2 dB
Default: 4
Description: Cell Selection Hysteresis, used for cell reselection between
different LAC.
Each change of location area requires a location update to be
performed, which increases signaling load. In order to prevent
Ping-Pong effects for cell selection across location area borders, a
hysteresis, defined by CRH, is used.
The purpose of this parameter is to avoid frequent location
updating. The greater this parameter value, the more difficult the
cell reselection between different LAC.
CBCH CH Description
Range: -
Unit -
Default: -
Description: CBCH channel description.
It only appears when short message cell broadcast comes into
service. As an option of the system message 4, it consists of 6
bytes. The first byte is channel description. The second byte
includes channel type, TDMA offset and TN (timeslot No.). The third
and fourth bytes include MAIO (high bit) when H=1 (frequency
hopping), ARFCN (high bit) when H=0 (no frequency hopping) and
TSC information. 4, It includes MAIO (low bit) and HSN information.
5, It includes low bit of ARFCN.
CBCH mobile allocation
Range: -
Unit -
Default: -

2-26
Description: If FH is used in CBCH channel description, then this parameter
must be set. If the No.1 bit of the value is "1", it indicates that the
No.1 frequency in the CA list belongs to the MA list.
ACS
Range: Yes, No
Unit -
Default: No
Description: Additional reselection parameter indication, used to inform MS
where to get the related cell reselection parameter during cell
reselection. In the case of ACS=0, it is meaningless in system
information 3; while it is valid in system information 4, MS should
get the PI and the related parameters involving in the calculation of
C2. In the case of ACS=1, MS should get the PI and the related
parameters involving in the calculation of C2 from the system
information 7 and 8.
PI
Unit -
Default: Yes
Description: Cell reselection parameter indication, sent on the broadcast
channel. It is used to determine whether CRO, TO, and PT are
used. In fact, it informs MS whether to adopt C2 for the cell
reselection. See Protocol 0408 and 0508. The cell reselection
caused by parameter C2 has an interval of at least 5 second so as
to avoid frequent MS activation of the cell reselection process.
Note: The MS will calculate C1 and C2 of the serving cell at a minimum of
every 5 seconds. When necessary, it will re-calculate C1 and C2
value of all non-serving cells (neighboring cells). The MS constantly
checks the following conditions:
Whether the path loss (C1) of the current serving cell drops below 0
within 5 s. If yes, it shows too much path loss of this cell.
The C2 value of a suitable non-serving cell always exceeds that of
serving cells in 5 s, and meets the following conditions:
1) If a new cell is in a different location area, the C2 value of this
new cell minus CRH (from the system information of the serving
cell) constantly exceeds the C2 value of the serving cell for 5 s
period.
2) If a cell reselection has occurred within the last 15 s, then the C2
value of the new cell minus 5 dB constantly exceeds the C2 value
of the serving cell for 5 s period.
A new cell that meets the conditions above is a better cell. When a
better cell exists, the MS will have cell reselection. Cell reselection

2-27
will not occur within 5 s after the last reselection.
CRO
Range: 0–63. Corresponding level value: 0–126db.
Unit 2 dB
Default: 0
Description: Cell reselection offset. It indicates the C2 value can be corrected
manually. See Protocol 0508 and 0408. This parameter affects only
GSM Phase II MS.
Note: The setting of RXLEV-ACCESS-MIN and CRO should guarantee
that cells with same priority have the same cell reselect offset.
Otherwise, something abnormal will occur.
TO
Range: 0–7. The corresponding value: 0–60db and 7 corresponds to
"infinite"
Unit -
Default: 0
Description: Cell reselection temporary offset, indicating the temporary
correction value of C2. It works only during the "cell reselection
penalty time" period. See Protocol 0508 and 0408. This parameter
affects only the GSM Phase II MS.
PT
Range: 1．0–31. The corresponding time is 20–620s, 31 is a reserve value
used to change the effect of the CRO on C2.
Unit -
Default: 0
Description: Cell reselection penalty time, a parameter to ensure the safety and
validity of cell reselection Its main function is to avoid too frequent
MS cell reselection. See Protocol 0508 and 0408. This parameter
affects only the GSM Phase II MS.
Note: After the MS completes cell selection, the MS in idle mode starts
the cell reselection process to select a better serving cell. It is C2
that determines cell reselection. The principle of MS reselection is
to select the cell with the maximum C2 value as compared with the
serving cell. C2 calculation is as follows:
1. When the ENALTY_TIME is not 11111,C2
=C1+CELL_RESELECT_OFFSET–TEMPORARY_OFFSET×H
(PENALTY_TIME–T)
Where,

2-28
If x<0, H(x) =0 ; If x_0, H(x) =1.
T is the timer, started from zero at the point at which the cell was
placed by the MS on the list of strongest carriers. T is reset to zero
whenever the cell is no longer on the list of strongest carriers. The
precision of T is one TDMA frame (about 4.62ms). When this cell is
out of the six cell tables, the timer T is reset.
Special remarks: when the cell reselection occurs in a serving cell,
the original serving cell becomes the neighbor cell of the new
serving cell. The T of the original serving cell becomes the initial
value of PENALTY_TIME (parameter of original cell). If
PENALTY_TIME–T<0, that is C2=C1+CRO, then do not implement
the time penalty on the original cell.6
2. If PENALTY_TIME is 11111, then
C2=C1–CELL_RESELECT_OFFSET
.CELL_RESELECT_OFFSET is used to modify the cell reselection
parameter C2 manually.
This shows that C1 reflects the radio channel quality. The greater
the C1, the better the channel quality. But the C2 value is manually
corrected and can be adjusted by CRO. Thus, the C2 value can be
calculated accordingly to CRO, TO, and PT so as to reselect the
serving cell. For example, we can set CRO so that the C2 value of
GSM1800 is greater than that in GSM900. Thus, even in cases that
the signal strength in the GSM1800 cell is lower than that in
GSM900, MS still can reselect GSM1800 cells as serving cell.
ECSC
Range: Yes, No
Unit -
Default: No
Description: Early Classmark Sending Control. Indicates if an MS in the cell is
allowed to use early Classmark sending. See Protocol 0408.
After receiving the class mark change message, MS will send
additional Classmark message to the network as soon as possible.
CM3 (Classmark 3) message includes the information about MS
power, multiband and/or multislot capability. To perform handover
between different bands, the power level must be described
correctly. In the process of paging and sending of the BA2
information between different bands, the CM3 message must be
known.
Note: 1) ECSC is invalid for single-band MS. For dual-band MS, when
ECSC is not used, after the MS sends EST IND, MSC will still send
the CLASSMARK REQUEST message, and MS will response with
the CLASSMARK UPDATE message, and other functions are not
affected. For the dual-band MS, when this parameter is set to No,
the connection time between different MS will be obviously
shortened.
2) When the encryption function is enabled, The parameter must be

2-29
set to “Yes”.
3) M900/M1800 hybrid cells sharing BCCH are advised to be
configured as “yes”, and M1800 cells in dual-band network are
advised to be configured as :yes”. When adopt A5/4~7 encryption
algorithm, it is advised to be configured as “yes”.
Power deviation indication
Range: Yes, No
Unit -
Default: No
Description: Determines whether to calculate the power deviation of CM3 MS of
DCS1800.
Power deviation
Range: 0–3. The corresponding values: 0db. 2db. 4db. 6dB
Unit -
Default: 1
Description: After accessing on RACH, if CM3 MS of DCS1800 does not receive
the original power control command, its power output = the
maximum MS transmitting power level + the power deviation. See
Protocol 0508.
MBR
Range: 0–3
Unit -
Default: 0
Description: Multiband reporting. Used to inform MS to report the information
about neighboring cells of multiband and this report is sent in
system information 2ter and 5ter.
No matter which band they belong to, when its value is "0", MS
reports MRs of 6 strongest neighboring cells whose NCC is known
and allowed.
When its value is "1", MS reports MR of a neighboring cell, which
has the strongest signal and whose NCC is known and allowed in
each band (excluding the band of the current serving cell). The rest
the MRs belong to the neighboring cells of the current band.
When its value is "2", MS reports MR of two neighboring cells,
which have the strongest signal and whose NCC is known and
allowed in each band (excluding the band of the current serving
cell). The rest the MRs belong to the neighboring cells of the
current band.

2-30
When its value is "3", MS reports MR of three neighboring cells ,
which have the strongest signal and whose NCC is known and
allowed in each band (excluding the band of the current serving
cell). The rest the MRs belong to the neighboring cells of the
current band. See Protocol 0508. When the traffic of each band is
basically the same and there is no special requirement on the
band, this parameter is set to "0". When the traffic of each band is
obviously different and MS is expected to preferably accessing to a
certain band, this parameter is set to "3". In other cases, it is set to
"1" or "2".
2.3.2 Cell Configuration Table
Data service allowed
Range: NT14.5 K, NT 12 K, NT 6 K, T 14.4 K, T 9.6 K, T 4.8 K, T 2.4 K, T 1.2
K, T 600BITS, T 1200/75
Unit -
Default: 0110111000
Description: Indicates which data service is supported. The value "0100000000"
indicates only the NT 12 K data service is supported. The specific
value should be set according to the actual situation.
Encryption algorithm
Range: Not supporting encryption, A5/1–A5/7
Unit -
Default: 10000000
Description: Determines which encryption algorithm is used. This parameter
should not be composed of all 0s. "10000000" indicates that the
encryption is not used.
Note: Encryption algorithm should be consistent between the BSS and the
NSS. It should be first described in MAP functional flow of MSC that
whether the system needs to encrypt and which encryption algorithm
the system uses. The final selection of encryption algorithm is
determined by BSC data configuration and the MS capability.
TRX Aiding Function Control
Range: TRX Aiding Not Allowed;
Allowed, Recover Forbidden;
Allowed, Recover Immediately;
Allowed, Recover When Check Res
Unit -
Default: Allowed, Recover When Check Res

2-31
Description: TRX Aiding Not Allowed: TRX aiding is not allowed. That is, the TRX
aiding function is closed.
Allowed, Recover Forbidden: TRX aiding is allowed. However, after
the fault TRX is restored, TRX recovery is forbidden.
Allowed, Recover Immediately: TRX aiding is allowed. After the fault
TRX is restored, it can be recovered immediately.
Allowed, Recover When Check Res: TRX aiding is allowed. After the
fault TRX is restored, it will not be recovered immediately but
recovered during resource check at 3:00 am.
1, BCCH mutual aiding: Switch the main BCCH to another normal
TRX.
2, BCCH mutual aiding change back: When the faulty BCCH TRX
recovers, the main BCCH switches back to the original TRX
recovered.
3, Baseband frequency hopping mutual aiding: It takes place when
the TRX in a cell participating in baseband frequency hopping is
faulty, or BCCH mutual aiding occurs. In this case, the cell will be
initialized as “no frequency hopping cell”.
4, Baseband frequency hopping mutual aiding change back: It takes
place when all TRXs in a cell participating in baseband frequency
hopping recovers to normal and the original BCCH TRX is also
normal. In this case, the cell recovers to baseband frequency
hopping mode,
5, The cell will be initialized only if TRX mutual aiding or change back
(BCCH mutual aiding or baseband frequency hopping mutual aiding)
occurs.
6, For any types of BTSs, no mutual-aiding will occur 15 minutes
after the cell is initialized.
FH mode
Range: Not FH, baseband FH, RF FH
Unit -
Default: Not FH
Description: Determines whether the frequency hopping is used and which
frequency hopping mode is used.
Note: BTS2X supports RF frame frequency hopping, BTS3X (all versions) supports
baseband frequency hopping and RF frequency hopping, including timeslot
frequency hopping and frame hopping.
SMCBC DRX
Range: Yes, No
Unit -
Default: No

2-32
Description: Short message of cell broadcast DRX mode. See the related
materials on the cell broadcast. Here, DRX means SMBCB DRX
MODE (cell broadcast short message discontinuous receiving mode).
BSC supporting SMBCB DRX must send scheduling message for MS
to receive cell broadcast messages discontinuously. A scheduled
message includes many broadcast messages to be sent in a cell.
The duration occupied by the broadcast messages in scheduled
message is called scheduled period. The scheduled message
includes both the description of short messages (arranged in the
order of transmission sequence) to be broadcasted and their
respective positions in the scheduled period. Therefore, MS can fetch
the wanted broadcast message in the least time, and the power
consumption is also decreased. Please refer to 0412.
Note: If the cell broadcast message function is used, it must be set to
"Yes". Otherwise, it must be set to "No".
DL DTX
Range: Yes, No
Unit -
Default: Yes
Description: Indicates whether to use downlink DTX in a cell. The DTX switch in
MSC is still functional. When MSC forbids downlink DTX, then
downlink DTX cannot be used in BSC. When MSC allows downlink
DTX, then downlink DTX in BSC is determined by BSC DL DTX.
South latitude/North latitude
Range: 0, 1
Unit -
Default: 0: north latitude
Description: 0: north latitude
1: south latitude
East longitude/West longitude
Range: 0, 1
Unit
Default: 0: east longitude
Description: 0: east longitude
1: west longitude
Latitude

2-33
Range: [0, 223
-1]
Unit
Default: Calculate based on the default value in the configuration console
Description: This field is used to calculate the latitude code based on the actual
latitude.
N represents the latitude code. X represents the absolute value of the
actual latitude (0. – +90).
N is represents by three bytes totally 24 bits (bit0 – bit23) .bit23 is the
sign bit. bit0-bit22 are the numeric value .
1) Sign bit
S: Sign of latitude
Bit value 0 North positive
Bit value 1 South negative
2) Numeric value
N= [X*223
/90.], [] means take the integer value. The range of N is: 0
–223
-1 except when X=90. When X = 90, N is 223
-1, but not 223
.
Longitude
Range: See ”description”
Unit none
Default: Calculate based on the default value in the configuration console
Description: This field is used to calculate the longitude code based on the actual
longitude.
N represents the longitude code. X represents the actual longitude
(-180. – +180). −180 degree means the east longitude 180 degree.
N is represents by three bytes totally 24 bits (bit0 – bit23) in the
form of complement
N= [X*223
/360.], []means take the integer value. The range of N is:
–223
–223
-1 except when X=180. If X=180, N is 223
-1 but not 223
.
Antenna azimuth angle
Range: 0 – 360
Unit Degree
Default: 360
Description: –
Note 360 degree omni antenna
Included Angle (Degree)

2-34
Range: 1 – 360
Unit degree
Default: 360
Description:
Note 360 degree omni antenna
Antenna height
Range: 0 – 65535
Unit decimeter
Default: 400
Description: The height of the antenna
2.3.3 Cell Allocation Table
It is also called CA list. The CA table mainly configures the available frequencies and
at most 64 frequencies can be configured.
According to the GSM 900 recommendations the channels are numbered as follows:
fl(n) = 890.2 + 0.2*(n - 1) in MHz, where n (Absolute Radio Frequency Channel
Number, ARFCN) goes from 1 to 124 and fl is a frequency in the lower band, BTS
receiver.
fu(n) = fl(n) + 45 in MHz, where n goes from 1 to 124 and fu is a frequency in the
upper band, BTS transmitter.
According to the DCS 1800 recommendations the channels are numbered as follows:
fl(n) = 1710.2 + 0.2*(n - 512) in MHz, where n (Absolute Radio Frequency Channel
Number, ARFCN) goes from 512 to 885 and fl is a frequency in the lower band, BTS
receiver.
fu(n) = fl(n) + 95 in MHz, where n goes from 512 to 885 and fu is a frequency in
the upper band, BTS transmitter.
The configuration principle is as shown in the following example. For example, if a
BTS S5/5/5 is to be configured, its cell allocation table is as follows:

2-35
Module
ID
Cell ID
ARFCN
0
ARFCN
1
ARFCN
2
ARFCN
3
ARFCN
4
ARFCN…
2 51 45 59 68 77 86 Not filled
2 52 49 62 71 80 89
2 53 53 92 65 74 83
BSC sends the cell CA list to MS through system information.
For the sake of forming a regulation, it is recommended to set ARFCN 0 as BCCH.
CA list is delivered in bitmap. Different bitmaps support different frequency sets.
2.3.4 BA1 Table
BA1 table is used to inform the MS in the idle mode to research the BCCH
frequencies of neighboring cells. BA list is sent through system information 2, 2bis,
and 2ter. The MS in the idle mode keep monitoring the information about BCCH
frequencies in the BA list so as to initiate the cell reselection process. The frequencies
in BA list should be the consistent with the configuration of neighboring cells.
2.3.5 BA2 (SACCH) Table
It is also called BA2 list. BA2 table is used to inform the MS in the active mode to
search the BCCH frequencies of neighboring cells. BA list is sent through system
information 5, 5bis, and 5ter.
Note: During network optimization, all BCCH frequencies in the network
can be put into the BA2 table so as to use the performance
measuring function of the undefined neighboring cells in the traffic
statistics console to find out the adjacent missing cells.
It is recommended that the maximum frequencies should not
exceed 15.
The limitation of 32 neighbor cells is not due to the BA table but the
cell neighboring relationship array, which is defined by the host and
whose length is 32. In addition, the auto configuration system
checks the relationship of the 32 neighbor cells. Under automatic
mode, the auto configuration system fills the BA1 and BA2 table
according to the neighboring cell relationship. If the neighboring
relationship is modified, for instance, add a cell, delete a cell, you
shall maintain the BA1, BA2 table manually.

2-36
2.3.6 Cell Attribute Table
Interf. band Thrsh. 0
Range: 115–85
Unit dBm
Default: Fixed as 110.
Description: BSS measures the uplink status of the radio channels occupied
by MS, calculates and reports the interference of the idle channel
so as to facilitate BSC to decide channel assignment.
Interference is manually classified into 6 levels according to the
interference signal strength.
Note: 1, Interf. band Thrsh. 0:excluded in traffic statistics.
2, It ranges from 115 to 85 for all versions of BTS2X, previous versions of BTS3X
03.1130, previous versions of 3001C07.0301 and previous versions of
3002C02.0820. Hard cell kickoff will be caused if Interf. band Thrsh. 0 is beyond the
range.
3. It ranges from 115 to 48 for BTS3X 03.1130 and its later versions, 3001c 07.0301
and its later versions, 3002c 02.0820 and its later version.
Range: 115–85
Unit dBm
Default: 105
Description: See above description of Interf. band Thrsh. 0.
Note: See above note of Interf. band Thrsh. 0.
Interf. band Thrsh.2
Range: 115–85
Unit dBm
Default: 98
Range: 115–85
Unit dBm
Default: 90

2-37
Range: 115–85
Unit dBm
Default: 87
Range: 115–85
Unit dBm
Default: Fixed as 85
Description: -
Interf. Calculation period
Range: 1–31
Unit SACCH period (480 ms)
Default: 20
Description: The interference level on the idle channel is averaged before
radio resources indication messages are sent, The averaged
result is used to classify the interference level into 5 interference
bands. This parameter is the period of averaging the interference
level. See Protocol 0808, 0858, and 1221.
SACCH multi-frames
Range: 0–63
Unit SACCH period (480 ms)
Default: 14
Description: Used to determine whether the uplink radio link connection fails.
BSS will judge whether the radio link failure as according to
uplink SACCH BER. See Protocol 0508, 0858, and 0408.
When BTS receives the uplink MRs on SACCH, it will set this
parameter as the initial value of the timer which is used to judge
the radio connection failure. Every time BTS fails to decode the

2-38
MR sent from MS, this timer minus 1 and plus 2 every time BTS
succeeds to decode the MR. When the timer reaches 0, then it
judges that the radio connection fails. Then BTS sends a
message of radio connection failure to BSC. This parameter and
the radio link timeout are used to judge the uplink/downlink radio
connection failure.
Note: 1, Earlier versions of BTS3X 04.0529 support a maximum of 16
SACCH multiframes, while 31 do BTS3X (05.0529) and BTS2X,
and 63 do BTS3X (versions after 06.0529).
2, BTS3001C, 05.0301A or earlier support a maximum of 31
SACCH multiframes, while 63 do versions after 06.0301A.
3, Alarm occurs if the parameter value does not match with the
version.
BTS3X, NACK is returned during loading (parameter value is
beyond the range). Cell initialization fails.
BTS2X, NACK is returned during loading (process error). Cell
initialization fails.
Various BTS versions supporting 0–63 SACCH multiframes
BTS3X BTS23 BTS22C BTS24 BTS3001C(3001C+)
BTS3002
06.0529 and latter 07.0420 and latter 06.0110 and later 06.1111 and
later 06.0301A and later 00.0820 and latter
Radio resource report period
Range: 0–255
Unit Second
Default: 10
Description: BTS needs to periodically inform BSC of the interference level of
idle channel on every TRX through the radio indication message.
This parameter specifies the interval for sending the message.
CCCH load indication period
Range: 0–255
Unit Second
Default: 15
Description: This parameter is used by the BTS to inform the BSC that the
load of one specified CCCH slot .If the load of a certain CCCH
exceeds the related threshold, BTS should periodically send
CCCH overload messages to BSC. CCCH overload includes
RACH overload and PCH overload. This parameter indicates the
interval of the BTS for sending overload message. A very small

2-39
value of this parameter will cause a large signaling traffic of Abis
interface. If this value is set too large, BSC may not be able to
handle BTS abnormality in time.
CCCH load Thrsh.
Range: 0–100
Unit %
Default: 80
Description: This parameter is used by the BTS to inform the BSC that the
load of one specified CCCH slot .If the load of a certain CCCH
exceeds this threshold, BTS should periodically send CCCH
overload messages to BSC. If the value of this parameter is too
low, BTS is more likely to report CCCH overload message to
BSC. In this case MS is more difficult to access the system and
thus lower the resource utilization. If the value is too high, BTS
will report overload message to BSC only when the system
resource is in shortage. This will cause the system fault more
easily.
Max resend times of Phy. Info.
Range: 1–255
Unit times
Default: 30
Description: During the asynchronous handover, MS constantly sends the
handover access Burst to BTS. When BTS detects the Burst,
BTS send physical information to the MS on the main
DCCH/FACCH, and starts timer T3105. At the same time, it
sends the MSG_ABIS_HO_DETECT message to BSC. The
physical information contains related information of different
physical layers so as to guarantee the correct access of MS. If
the timer T3105 times out before receiving the SAMB frame from
MS, BTS re-sends physical information to MS.
This parameter specifies the maximum times Ny1 for re-sending
physical information. If the number of resending times exceeds
Ny1 and BTS still has not received any correct SAMB frame from
MS, BTS will send BSC the connection failure message and
handover failure message. After BSC receives the messages, it
will release the assigned dedicated channel and stop timer
T3105. See Protocol 0858 and 0408. The value of this parameter
can be increased correspondingly when the handover becomes
slow and handover success rate is low which is caused by clock
or bad transmission condition.
Note: When Ny1 * T3105 > the duration between EST IND and HO
DETECT, MS handover will succeed. Otherwise, MS handover
will fail.

2-40
T3105
Range: 0–255
Unit 10 ms
Default: 7
Description: T3105 is a timer for radio connection. See the description of Max
resend times of Phy. Info.
Overload indication period
Range: 1–255
Unit Second
Default: 15
Description: Specifies the interval for BTS to send the overload message to
BSC. Overload includes TRX processor overload, downlink
CCCH overload and AGCH overload. See Protocol 0858.
RACH busy Thrsh
Range: 0–63, (-110 dBm–- +47 dBm)
Unit Grade
Default: 5 (BTS2X, BTS24)), 16 (BTS3X)
Description: The threshold level that judges whether the RACH is busy.
1. In BTS3X versions, it means level threshold for MS random
access. If the level of some random access burst timeslot is
greater than this threshold, BTS regards this RACH busy. In
BTS3X, this parameter is used to indicate whether the RACH is
busy or not. The threshold value has no impact upon MS normal
access.
2. In BTS2X versions (excluding BTS24), it means level
threshold for MS random access. If the level of some random
access burst timeslot is greater than this threshold and the
access demodulation succeeds , BTS regards this RACH busy,
and judge whether the RACH access is valid with reference to
“random access error threshold”. In BTS2X, this parameter is
used to indicate whether the RACH is busy or not. Besides, the
threshold value has impact upon MS normal access. That is, only
if the level of the random access burst timeslot is greater than the
threshold, is the MS access allowed.
3. In the BTS24 version, it has two meanings: first, it means the
level threshold for MS random access. If the level of some
random access burst timeslot is greater than this threshold, BTS
regards this timeslot is busy; then, it means whether the MA
access is allowed. Only when the access level (including random
access and handover access) is greater than the threshold, the
access is allowed.

2-41
Note: 1, In BTS2X (excluding BTS24), it means level threshold for MS
random access. If the level of some RACH burst timeslot is
greater than this threshold, BTS regards this RACH busy. This
parameter must be set based on actual BTS sensitivity and the
lowest MS access level to ensure uplink/downlink balance. This
parameter value has impact upon RACH BURST switch access
during asynchronous switching.
2, In BTS3X, RACH busy threshold has impact upon the report of
CCCH_LOAD_IND, but not any upon MS access. If the BCCH
level received by network is greater than RACH busy threshold,
the RACH access will be included in the CCCH_LOAD_IND
statistics no matter the decoding is successful. Likewise, if the
BCCH level received by network is lower than RACH busy
threshold and the decoding is successful, RACH access will also
be included in CCCH_LOAD_IND statistics. The statistics period
is RACH average load timeslots. If the RACH busy threshold is
set too low, BTS tends to judge the RACH as busy and report
overload message to BSC. Whereas, BTS can not judge the
status of RACH timeslot correctly.
3, In BTS24, RACH busy threshold has two settings: when used
to judge the busy timeslot, its setting is similar to that of BTS30;
when used to judge whether the level of the random access is
valid, its setting is similar to that of BTS20.
4, The settings of BTS312, 3001C, 3001C+ and 3002C are
similar to that of BTS30.
RACH min. access level
Range: 0–255
Unit Grade
Default: 5 (BTS3X 05.0529A and its previous version).
1 (BTS 3X 06.0529A and its later version).
Description: The "RACH minimum access level" of the version 03.0529 of
BTS3X or above will affect MS access. This parameter indicates
the threshold level at which the system determines MS random
access. Only when the level on RACH exceeds this threshold will
BTS regard the access to be successful.
When the level of the received RACH burst is smaller than the
threshold, BTS regards the access is invalid.
Because the RACH busy threshold shall be greater than the
RACH minimum access level, the RACH minimum access level
of the BTS24 can be regarded as “being masked”.
For the BTS2X (excluding BTS24), RACH minimum access level
is invalid.
Note: The value of RACH busy Thrsh. should be greater than RACH
min. access level.
To avoid MS being unable to set up call even it is in the coverage

2-42
area, consideration should be given to BTS sensitivity and MS
RXLEV_ACCESS_MIN during the setting of this parameter.
Average RACH load TS number
Range: 0–65535
Unit timeslot number
Default: 5000
Description: Indicates the duration of judging whether RACH timeslot is busy,
i.e., the number of RACH Burst during one RACH occupancy
detection. If the value of this parameter is too low, BTS is more
likely to report RACH overload message to BSC. This will cause
that MS more difficult to access the system and lower the
resource utilization. If the value is too high, only when the system
resource is in shortage will BTS report overload message to BSC
which is likely to cause the system fault.
Max RC power reduction
Range: 0–255
Unit 2 dB
Default: 5
Description: Specifies the maximum level of BTS RF power that can be
decreased.
T200 SDCCH(5ms)
Range: 1–255
Unit 5 ms
Default: 60
Description: The value of T200 on SDCCH. when support SAP10 service.
Note: The T200 timer (Timer200) is an important timer about data link
layer LAPDm of the Um interface. Different timer values should
be set for different LAPDm channels such as SDCCH, FACCH
and SACCH. This is because these channels have different
transmission rate. The T200 timer is used to avoid deadlock
during data transfer on the data link layer. The communication
entities of both ends of such data links adopt the sending of
acknowledgment mechanism. That is to say, every time message
is sent, the opposite end is requested to acknowledge the
reception. If this message is lost for unknown reasons, it will
occur that both ends keep waiting, leading to system dead lock.
Therefore, a timer should be started when the sender sends a
message. If the timer times out, the sender will regard that the
receiver has not received the message and will resend the
message.

2-43
T200 FACCH/F(5 ms)
Range: 1–255
Unit 5 ms
Default: 50
Description: The value of T200 on FACCH/F.
T200 FACCH/H(5 ms)
Range: 1–255
Unit 5 ms
Default: 50
Description: The value of T200 on FACCH/H.
T200 SACCH TCH SAPI0(10 ms)
Range: 1–255
Unit 5 ms
Default: 150
Description: The value of T200 on TCH SAPI0. SACCH when TCH supports
SAPI0 service
T200 SACCH TCH SAPI3(10 ms)
Range: 1–255
Unit 10 ms
Default: 200
Description: The value of T200 on SACCH when TCH supports SAPI3 service
T200 SACCH SDCCH(10 ms)
Range: 1–255
Unit 10 ms
Default: 60
Description: The T200 value of SACCH on the SDCCH
T200 SDCCH SAPI3(5ms)
Range: 1–255
Unit 5 ms

2-44
Default: 60
Description: The value of T200 when SDCCH supports SAPI3 service.
MAX TA
Range: 0–63(Normal cell and single TS extended cell), 0–255(dual TS
extended cell).
Unit bit period (1 bit = 0.55 km)
Default: 62 for normal cell, 63 for single TS extended cell, and 219 for
dual TS extended cell.
Description: Maximum Time Advance. Determines the actual coverage area
of BTS. When BTS receives the channel request message or
handover access information, it determines whether channel
assignment or handover should take place in the current cell by
comparing the TA with the value of this parameter. Handover
successful will be affected with a small configuration.
Note: The Range of MAX TA for normal cells is 0–63.Single TS
extended cell is not recommended at present.
.At present, in BTS temporary version 80.0529A supporting dual
TS extended cell, MAX TA in cell property configuration list does
not work in application. Its value ranges from 0 to 127. BTS
initialization fails if MAX TA exceeds 127.
Frame start time
Range: 0–65535
Unit Frame number
Default: 65535
Description: The frame number of the BTS starts timeslot that is used to keep
synchronization between BTS and MS after base station has
re-initialize.
Paging times
Range: BTS 2X (except BTS24): 1~4
BTS24 version 07.1111 and later, BTS3X version 01.1130SP03
and later, BTS3001C version 07.0301 and later, BTS3002C
version 03.0820 and later: 1~8
BTS3X version 01.1130 to version 01.1130SP02: 1~5
The earlier versions of the above BTSs do not support paging
retransmission
Unit Times
Default: 1

2-45
Description: In BTS2.X, this parameter is used for BTS to determine whether
paging is resent. Together with the paging times configured in
MSC, they jointly control the paging resend times. The total
paging times approximate to be the multiplication of the
two.BTS3X and its later version will support paging resending
function.
Note: The MSC paging resend strategy is as follows:
1) MSC6.0 can resend paging message at most 4 times, and the
resend intervals are 3 seconds, 3 seconds, 2 seconds, and 2
seconds respectively.
2) Within 2 seconds after the last paging message is sent, i.e., 12
seconds after the first paging message is sent, if there is no
paging response from MS, MSC will regard it as timeout.
MSC can adopt two types of paging modes: TMSI and IMSI.
Random access error Thrsh
Range: 0–255
Unit -
Default: 180
Description: The system can determine whether a received signal is an MS
random access signal by judging the dependency on the training
sequence (41bit). This parameter defines the dependency of the
training sequence. If the value of this parameter is too small,
there will be a high random access signal error tolerance, so that
MS random access will be easy but the misreport will also be
high. If the value is too large, the MS misreport rate will be low,
but the normal access will be hard.
DC bias voltage Thrsh.
Range: 0,2–4
Unit
Default: 0 for with tower-mounted amplifier, 3 for without tower-mounted
amplifier
Description: BTS2X, This parameter is used to compensate the RSSI
difference of whether there is tower-mounted amplifier. This is to
guarantee a correct RSSI value in the case of without
tower-mounted amplifier. The value of this parameter in the case
of without tower-mount amplifier is greater than the case of with
tower-mount amplifier by 3.
BTS3X,no use
Cell extension type

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