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20 EGPRSAbout This Chapter
20.1 Overview
This describes the EGPRS. The Enhanced Data Rate for GSM Evolution (EDGE) can provide
high-rate data services.
20.2 Availability
This lists the NEs, software versions, licenses, and other conditions required for the
implementation of EDGE.
20.3 ImpactThis describes the impact of EGPRS on system performance.
20.4 Technical Description
This describes the technical aspects of EDGE. EDGE is an evolution stage of PS services. It can
be called as 2.75 G mobile communication technology. If the equipment on the current network
remains unchanged, EDGE can be implemented through the upgrade of relevant software. EDGE
can enhance the transmission r ate of PS data.
20.5 Capabilities
This describes the EDGE capabilities of the built-in PCU and external PCU.
20.6 Implementation
EDGE implementation consists of configuring EDGE with the built-in PCU and configuringEDGE with the external PCU.
20.7 Maintenance Information
This lists the alarms and counters related to EDGE.
20.8 References
The references indicate the documents about EDGE from the related standard organizations.
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20.1 Overview
This describes the EGPRS. The Enhanced Data Rate for GSM Evolution (EDGE) can provide
high-rate data services.
Definition
EDGE consists of the Enhanced GPRS (EGPRS) and the Enhanced Circuit Switched Data
(ECSD).
l EGPRS is the enhanced GPRS. EGPRS uses the 8PSK modulation mode so that the rate
of a single channel is improved. The maximum rate of a single channel is 59.2 kbit/s.
l ECSD is the enhanced High Speed Circuit Switched Data (HSCSD).
NOTE
The Huawei BSS supports only EGPRS. Unless otherwise specified, EDGE referred to in this document
indicates EGPRS.
Purposes
Using the new modulation and coding schemes, EDGE greatly improves the data service rates.
The data transmission rates on the Um interface in EDGE are almost three times those in GSM.
This meets the requirements of high-rate data services.
Term
None.
Acronyms and Abbreviations
Acronym andAbbreviation
Full Spelling
EDGE Enhanced Data Rate for GSM Evolution
GPRS General Packet Radio Service
PCIC Packet Circuit Identity Code
BER Bit Error Rate
BVC BSSGP Virtual Connection
BSSGP Base Station System GPRS Protocol
QoS Quality of Service
TBF Temporary Block Flow
CCCH Common Control Channel
PCCCH Packet Common Control Channel
PACCH Packet Associated Control Channel
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Acronym andAbbreviation
Full Spelling
RLC Radio Link Control
20.2 Availability
This lists the NEs, software versions, licenses, and other conditions required for the
implementation of EDGE.
NEs Involved
Table 20-1 lists the network elements (NEs) involved in EDGE.
Table 20-1 NEs Involved in EDGE
MS BTS BSC PCU SGSN GGSN MSC HLR
√ √ √ √ √ √ - √
NOTE
l -: not involved
l √: involved
Software Versions
Table 20-2 lists the versions of GBSS products that support EDGE.
Table 20-2 GBSS products and software versions
Product Version
BSC BSC6000 V900R008C01 and later versions
BTS BTS3X G3BTS32V302R002C05 and later versions
BTS3012A All versions
BTS3001C All versions
BTS3002C All versions
BTS3002E BTS3000V100R002C01 and later versions
BTS3006C BTS3000V100R002C01 and later versions
BTS3012 DTRU BTS3000V100R001C01 and later versions
QTRU BTS3000V100R008C01 and later versions
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Product Version
BTS3012
AE
DTRU BTS3000V100R001C04 and later versions
QTRU BTS3000V100R008C01 and later versions
BTS3900 GSM BTS3000V100R008C02 and later versions
BTS3900A GSM BTS3000V100R008C02 and later versions
DBS3900 GSM BTS3000V100R008C01 and later versions
Miscellaneous
l The EDGE Support can be configured only when the GPRS Support is configured.
l For the concentric cell, the configuration between the overlaid subcell and the underlaidsubcell should be the same; that is, the overlaid subcell and underlaid subcell should be
configured in such as way that they both support EDGE or both do not support EDGE.
20.3 Impact
This describes the impact of EGPRS on system performance.
Impact on System Performance
l When the EDGE function is enabled, the maximum number of TRXs supported by one E1
cable in different network topologies decreases. Thus, the number of TRXs that each GMPS
or GEPS supports decreases.
NOTE
The number of idle timeslots and TRXs that each E1 cable can be configured with must meet the
following requirement: The number of configured TRXs + the number of configured idle timeslots/
8≤ the maximum number of configurable TRXs.
l When the external PCU is used and the EDGE function is enabled, the capacity of each
RPPU in the PCU decreases. The number of PDCHs that can be activated on each RPPU
decreases from 120 to 100.
Impact on Other Features
None.
20.4 Technical Description
This describes the technical aspects of EDGE. EDGE is an evolution stage of PS services. It can
be called as 2.75 G mobile communication technology. If the equipment on the current network
remains unchanged, EDGE can be implemented through the upgrade of relevant software. EDGE
can enhance the transmission rate of PS data.
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20.4.1 8PSK Modulation Mode
This describes the 8PSK modulation mode. In 8PSK modulation mode, symbols represent the
absolute phases of signals. There are eight possible symbols and each symbol represents three
bits of information.
The GSM system uses the Gaussian Minimum Shift Keying (GMSK) modulation mode. In
GMSK modulation mode, bit 0 or 1 indicates the change in signal phases. Each phase change
is represented by a symbol.
In 8PSK modulation mode, symbols represent the absolute phases of signals. There are eight
possible symbols and each symbol represents three bits of information. Therefore, the data rate
on the Um interface in EDGE can theoretically be three times that in GSM.
Figure 20-1 shows the I/Q relations for the modulation and demodulation in GSM and EDGE.
Figure 20-1 I/Q relations for the modulation and demodulation in GSM and EDGE
GPRS:
GMSK modulation
EGPRS:
8PSK modulation
1
0
Q
I
Q
I
(0,1,0)
(0,0,0)
(0,0,1)
(1,0,1)
(1,0,0)
(1,1,0)
(1,1,1)
(0,1,1)
NOTE
In terms of performance, the 8PSK modulation mode is better than the GMSK modulation mode. The
demodulation threshold of the 8PSK mode, however, is higher than the demodulation threshold of theGMSK mode. The modulation mode is radio environment specific. The PCU automatically adjusts the
modulation mode based on the BER report from an MS. Therefore, the modulation and demodulation mode
that EDGE uses can be 8PSK or GMSK.
Table 20-3 lists the modulation bits and corresponding symbols shown in Figure 20-1.
Table 20-3 Modulation bits and corresponding symbols
Modulation Bit Symbol
(1,1,1) 0
(0,1,1) 1
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Modulation Bit Symbol
(0,1,0) 2
(0,0,0) 3
(0,0,1) 4
(1,0,1) 5
(1,0,0) 6
(1,1,0) 7
NOTE
Table 20-3 lists all the modulation bits and corresponding symbols.
20.4.2 EGPRS Transmit Power
This describes the transmit power of a BTS that uses 8PSK modulation mode.
From the perspective of network operation, the transceiver of the BTS in EDGE must have the
same spectrum features as those of an ordinary transceiver. When sending the signals modulated
in 8PSK modulation mode, the transceiver of the BTS in EDGE uses the transmit power that is
2 dB–5 dB less than the average power in GMSK modulation mode. Thus, the requirements for
spectrum can be met. In the system, the cell parameter 8PSK power attenuation grade and the
trx parameter TRX 8PSK Level can be specified to meet the requirements.
On the BCCH, the transmit power of the signals modulated in 8PSK modulation mode is at most
4 dB less than the average transmit power of the signals modulated in GMSK modulation mode.
On the timeslot located before the timeslot of the BCCH/CCCH, the transmit power of the signals
modulated in 8PSK mode is at most 2 dB less than that of the signals modulated in GMSK
modulation mode.
20.4.3 MCS-1 to MCS-9 Coding Schemes
This describes MCS-1 to MCS-9 modulation and coding schemes used in EDGE.
EDGE uses MCS-1 to MCS-9 modulation and coding schemes, as listed in Table 20-4.
Table 20-4 Modulation and coding schemes in EDGE
Coding Scheme Modulation Mode Number of Bitsin the Payload ofEach Burst
Rate (kbit/s)
MCS-9 8PSK 2 x 592 59.2
MCS-8 2 x 544 54.4
MCS-7 2 x 448 44.8
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Coding Scheme Modulation Mode Number of Bitsin the Payload ofEach Burst
Rate (kbit/s)
MCS-6 592
544 + 48
29.6
27.2
MCS-5 448 22.4
MCS-4 GMSK 352 17.6
MCS-3 296
272 + 24
14.8
13.6
MCS-2 224 11.2
MCS-1 176 8.8
NOTE
For 544 + 48 and 272 + 24 in the previous table, 544 and 272 indicate the significant bits, and 48 and 24
indicate the padding bits.
The initial coding schemes used in EDGE can be specified through the parameters Uplink
Default MCS Type and Downlink Default MCS Type. When the EDGE service is used,
whether the uplink/downlink is adjusted based on the signal transmission quality depends on the
setting of the parameters Uplink Fixed MCS Type and Downlink Fixed MCS Type.
Figure 20-2 shows the rates of GPRS channels and those of EDGE channels.
Figure 20-2 Rates of GPRS channels and those of EDGE channels
kbit/s60.0
50.0
40.0
30.0
20.0
10.0
0.0CS-1 CS-2 CS-3 CS-4 MCS-1 MCS-2 MCS-3 MCS-4 MCS-5 MCS-6 MCS-7 MCS-8 MCS-9
8.0
12.214.4
20.2
8.811.2
14.8 17.6
22.4
29.6
44.8
54.4
59.2
GPRS
EDGE
GMSK
modulation
8PSK
modulation
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20.4.4 Link Quality Control
This describes the link quality control. The link quality control enables the system to adapt to
the radio transmission environment dynamically by changing modulation and coding schemes
during data transmission, thus improving the link quality.
EDGE uses a set of high-efficient link quality control algorithm. EDGE has two link quality
control modes: Link Adaptation (LA) and Incremental Redundancy (IR). The link quality control
mode is set through the parameter Link Quality Control Mode. For the cells where the signal
quality on the Um interface is good, this parameter is set to LA.
Basic Principle of LA
During data transmission, the sender retransmits the original data block or segments the original
data block into two data blocks and then transmits them. The receiver need not restore the
previous erroneous data blocks.
Basic Principle of IR
During data transmission, the sender does not consider the radio transmission environment at
first and uses a high data rate coding scheme for the data transmission. Although the data rate
is high, the capability of data protection is weak. If the data is received incorrectly, the sender
retransmits additional coding information. The receiver combines the new information with the
previous information and then performs decoding. The previous process is repeated until the
decoding succeeds.
l During uplink data transmission, the system notifies an MS to use the IR mode by setting
RESEGMENT in the uplink resource assignment message to 0 (segmentation forbidden).
In IR mode, the receiver should have sufficient memory to save the history information. If
the network memory is insufficient, the system can notify the MS of the memory
insufficiency by setting RESEGMENT in the UPLINK ACK/NACK message to 1.
l During downlink data transmission, if the memory of an MS is insufficient, the MS can
send MS OUT OF MEMORY to the network through a DOWNLINK ACK/NACK
message. Then, the network cannot use the IR mode in downlink data transmission.
20.4.5 Types of Preferred EGPRS Channels
This describes the types of preferred channels in EGPRS.
The preferred channel types are as follows:
l EGPRS dedicated channel
EGPRS dedicated channels can be used by only EGPRS MSs.
l EGPRS preferred channel
EGPRS preferred channels are preferentially used by EGPRS MSs. The EGPRS preferred
channels can be used by GPRS MSs when the channels are in the idle state. When an EGPRS
MS requests an EGPRS preferred channel, the GPRS MS that occupies the EGPRS
preferred channel should be transferred to other channels. The signals of an EGPRS MS
and those of a GPRS MS cannot be multiplexed onto one EGPRS preferred channel.
l Normal EGPRS channel
Normal EGPRS channels can be used by GPRS MSs and EGPRS MSs.
l GPRS channel
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GPRS channels are used by GPRS MSs. If a cell is not configured with EGPRS channels,
EGPRS MSs in the cell preferentially use GPRS channels to process GPRS services.
l Non-GPRS channel
Non-GPRS channels are not used for packet services.
When configuring Channel Type on the TRX, you can select the channel type through GPRS
Channel Priority Type.
When the system allocates PDCHs, the preferred channel type varies according to packet data
services.
l For the GPRS service, the GPRS channels are preferentially assigned. Then the normal
EGPRS channels are assigned and finally the EGPRS preferred channels are assigned.
l For the EGPRS service, the EGPRS dedicated channels are preferentially assigned. Then
the EGPRS preferred channels are assigned and finally the normal EGPRS channels are
assigned.
On the normal EGPRS channel, the GPRS MS may use the uplink channel, and the EGPRS MS
may use the downlink channel. The parameter Allow E Down G Up Switch can be set to avoid
channel multiplexing. If you want to eliminate the possibility of EDGE/GPRS co-timeslot, do
not configure normal EGPRS channels.
NOTE
Channels should be selected according to the preferred channel type. For example, if the channels on the
TRX that supports EGPRS are configured as GPRS channels, these channels can be used for only GPRS
services. EGPRS dedicated channels can be configured only as static channels. Other three types of
preferred channels can be configured as static or dynamic channels.
20.4.6 CCCH 11Bit EGPRS Access
EDGE supports 11Bit EGPRS access on the CCCH. EDGE reduces the access delay and
improves the access performance of the MS.
The access process of the 11Bit EGPRS on the CCCH is as follows:
1. The MS sends the 11bit EGPRS PAKCET CHANNEL REQUEST message on the CCCH
for one phase packet access.
2. The network assigns the EDGE channel for the MS through the IMMEDIATE
ASSIGNMENT message. Therefore, the EGPRS TBF is established.
Whether to enable CCCH 11Bit EGPRS access depends on the setting of the parameter Support
11BIT EGPRS Access.
20.4.7 Assignment of Idle Timeslots
For packet data services, the Abis interface supports the mapping of several timeslots to one
traffic channel. Then, the timeslots are divided and combined on the TX and RX ends.
The data rate of each timeslot on the Abis interface is 16 kbit/s. In EDGE, the data rate can be
59.2 kbit/s. In GPRS, the CS-3/CS-4 coding scheme needs to be added with a subtimeslot. In
EDGE, each PDCH can be added with three subtimeslots. EDGE coding schemes are MCS1 to
MCS9. The number of Abis links required for different coding schemes is different, as describedin Table 20-5.
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Table 20-5 Coding schemes and number of required Abis links
Coding Scheme Number of Required Abis Links
MCS-1–MCS-2 1
MCS-3–MCS-6 2
MCS-7 3
MCS-8–MCS-9 4
The number of idle timeslots on the Abis interface requested during EDGE coding scheme
adjustment is related to the coding scheme. As described in Table 20-5, when EDGE uses coding
schemes MCS-3-MCS-6, an idle timeslot on the Abis interface is required. The idle timeslots
on the Abis interface in the same BTS can be allocated to any PDCH on any TRX in the same
cabinet group. The idle timeslot on the Abis interface is set through the parameter Idle
Timeslots.
NOTE
l When the Abis interface uses IP or HDLC transmission, there is no idle timeslot configuration.
l When the Flex Abis feature of the BTS is enabled, if the CS traffic is light, idle timeslots may not be
configured and the EDGE service can still run normally.
l When the Flex Abis feature of the BTS is enabled, if the CS traffic is heavy, idle timeslots should be
configured. Otherwise, the EDGE service may fail for a long time.
20.5 Capabilities
This describes the EDGE capabilities of the built-in PCU and external PCU.
Built-in PCU
The EDGE capabilities of the built-in PCU are as follows:
l The system uses the resource pool redundancy configuration mode. The maximum
configuration that the system can support is 8 + 1 = 9 GDPUPs.
l The maximum number of cells supported by each GDPUP is 1,024.
l The maximum number of activated PDCHs supported by each GDPUP is 1,024. All the
channels support the MCS9 coding scheme.
l The maximum number of configurable PDCHs is 15,360.
l The maximum number of activated PDCHs in full configuration is 8,192. All the channels
support the MCS9 coding scheme.
l The maximum throughput on the Gb interface is 512 Mbit/s.
l The maximum number of uplink PDCHs that can be used by a single MS is 4.
l The maximum number of downlink PDCHs that can be used by a single MS is 5.
l The maximum number of pairs of configured GFGUGs/GEPUGs are 8.
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External PCU
The EDGE capabilities of the external PCU are as follows:
l The BSC supports 256 E1 lines on the Pb interface.
l Each GMPS/GEPS subrack supports 64 E1 lines on the Pb interface.
l Each GEIUP/GOIUP supports 32 E1 lines on the Pb interface.
l The GOIUP provides one STM-1 port, which carries 63 E1 links.
20.6 Implementation
EDGE implementation consists of configuring EDGE with the built-in PCU and configuring
EDGE with the external PCU.
20.6.1 Configuring EGPRS (with Built-in PCU)This describes how to configure EDGE on the BSC6000 Local Maintenance Terminal.
Prerequisite
l The system is configured to support GPRS. For details about how to configure GPRS with
the built-in PCU, see 19.6.5 Configuring GPRS (with External PCU).
l The subrack-OSP mapping is configured. For details, refer to Configuring the Subrack-
OSP Mapping.
l The license is applied and activated. To apply for and activate the license, do as follows:
1. In the BSC6000V900R008 Exceptional Commercial License Application Template,fill in the following information.
– Fill in the number of PDCHs to be purchased in the Number of resources column
corresponding to the Maximum Number of PDCH Groups Activated in the
Resource control items column.
– Fill in the number of TRXs to be purchased in the Number of resources column
corresponding to the Number of the TRX Supporting EDGE in the Resource
control items column.
2. Activate the license on the Local Maintenance Terminal. For details, refer to
Activating the BSC License.
Procedure
Step 1 Configure site idle timeslot.
1. On the Management Tree tab page of the BSC6000 Local Maintenance Terminal, right-
click the target BTS, and then choose Configure Site Idle Timeslot from the shortcut
menu. A dialog box is displayed, as shown in Figure 20-3.
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Figure 20-3 Configure Site Idle Timeslot dialog box
2. In the Idle Timeslot area, click the box under the Idle Timeslots area, and then enter the
number of idle timeslots to be configured.
3. Click Finish to end the configuration.
NOTE
l Idle Timeslots should be configured only when TransType of the BSC is set to TDM.
l When the Flex Abis feature of the BTS is enabled, if the CS traffic is light, idle timeslots may not be
configured and the EDGE service can still run normally.
l When the Flex Abis feature of the BTS is enabled, if the CS traffic is heavy, idle timeslots should be
configured. Otherwise, the EDGE service may fail for a long time.
Step 2 Configure the cell to support EDGE.
1. On the BSC6000 Local Maintenance Terminal, right-click a cell on the Management
Tree tab page, and then choose Set Cell Attributes from the shortcut menu.
2. In the displayed dialog box, double-click the target cell in the Cell view list box to add it
to the Selected cells list box. Then, click Next.
3. In the Cells to be set list box, select the target cell, and then click Set Cell Attributes. A
dialog box is displayed, as shown in Figure 20-4.
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Figure 20-4 Set Other Parameter dialog box
4. Select EDGE Support.
5. Click OK to end the configuration.
Step 3 Configure the channel type.
1. On the BSC6000 Local Maintenance Terminal, right-click a TRX on the Management
Tree tab page, and then choose Configure TRX Attributes from the shortcut menu.
2. In the displayed dialog box, select the target TRX in the TRX view list box, and then click
Configure TRX Attributes.
3. In the displayed dialog box, click the Channel Attributes tab, as shown in Figure 20-5.
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Figure 20-5 Channel Attributes tab page
4. Select Channel No., and then select the channel type that supports packet services such asPDTCH or TCH Full Rate in the Channel Type drop-down list box. Then, set GPRS
Channel Priority Type.
5. Click OK to end the configuration.
----End
20.6.2 Configuring EGPRS (with External PCU)
This describes how to configure EDGE on the BSC6000 Local Maintenance Terminal.
Prerequisitel The system is configured to support GPRS. For details about how to configure GPRS with
the external PCU, refer to 19.6.5 Configuring GPRS (with External PCU).
l The subrack-OSP mapping is configured. For details, refer to Configuring the Subrack-
OSP Mapping.
l The license is applied and activated. To apply for and activate the license, do as follows:
1. In the BSC6000V900R008 Exceptional Commercial License Application Template,
fill in the following information.
– Fill in the number of PDCHs to be purchased in the Number of resources column
corresponding to the Maximum Number of PDCH Groups Activated in theResource control items column.
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– Fill in the number of TRXs to be purchased in the Number of resources column
corresponding to the Number of the TRX Supporting EDGE in the Resource
control items column.
2. Activate the license on the Local Maintenance Terminal. For details, refer to
Activating the BSC License.
Procedure
Step 1 Configure Site Idle Timeslot dialog box
1. On the Management Tree tab page of the BSC6000 Local Maintenance Terminal, right-
click the target BTS, and then choose Configure Site Idle Timeslot from the shortcut
menu. A dialog box is displayed, as shown in Figure 20-6.
Figure 20-6 Configure Site Idle Timeslot dialog box
2. In the Idle Timeslot area, click the box under the Idle Timeslots area, and then enter the
number of idle timeslots to be configured.
3. Click Finish to end the configuration.
NOTE
l Idle Timeslots should be configured only when TransType of the BSC is set to TDM.
l When the Flex Abis feature of the BTS is enabled, idle timeslots may not be configured and the EDGE
service can still run normally,if the CS traffic is light.
l When the Flex Abis feature of the BTS is enabled, idle timeslots should be configured. Otherwise, the
EDGE service may fail for a long time,if the CS traffic is heavy.
Step 2 Configure the cell to support EDGE.
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1. On the BSC6000 Local Maintenance Terminal, right-click a cell on the Management
Tree tab page, and then choose Configure Cell Attributes from the shortcut menu.
2. In the displayed dialog box, double-click the target cell in the Cell view list box to add it
to the Selected cells list box. Then, click Next.
3. In the Cells to be set list box, select the target cell, and then click Set Cell Attributes. Adialog box is displayed, as shown in Figure 20-7.
Figure 20-7 Set Other Parameter dialog box
4. Select EDGE Support.
5. Click OK to end the configuration.
Step 3 Configure the channel type.
1. On the BSC6000 Local Maintenance Terminal, right-click a TRX on the ManagementTree tab page, and then choose Configure TRX Attributes from the shortcut menu.
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2. In the displayed dialog box, select the target TRX in the TRX view list box, and then click
Configure TRX Attributes.
3. In the displayed dialog box, click the Channel Attributes tab, as shown in Figure 20-8.
Figure 20-8 Channel Attributes tab page
4. Select Channel No., and then select PDTCH or Dynamic PDCH in the Channel Type
drop-down list box. Then, set GPRS Channel Priority Type.
5. Click OK to end the configuration.
----End
20.7 Maintenance InformationThis lists the alarms and counters related to EDGE.
Alarms
The alarms related to EDGE consist of alarms related to the built-in PCU and alarms related to
the external PCU, as listed in Table 20-6 and Table 20-7.
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Table 20-6 Alarms related to the built-in PCU
Alarm ID Alarm Name
291 Cell Transmission Delay Abnormal
293 GB BC Faulty
294 TRX Config Error
331 NSVC Faulty
332 NSVL Faulty
333 NSE Faulty
340 Cell PS Service Faulty
341 DSP Resource Overload
342 PTP BVC Faulty
343 NSVL Dynamic Configuration Process Failure
344 FAULTY DSP OVER LIMIT
Table 20-7 Alarms related to the external PCU
Alarm ID Alarm Name
104 All PBSLs in the PCU Are Faulty
128 No Circuit Configured in the PCU
Counters
The counters related to EDGE consist of counters related to the built-in PCU and counters related
to the external PCU, as listed in Table 20-8 and Table 20-9.
Table 20-8 Counters related to the built-in PCU
Counter Description
A331 Delivered Paging Messages for PS Service
ZTA308H Immediate Assignment Requests per BSC (PS
Service)
A031 SGSN-Initiated Paging Requests for PS
Service
L3188D PACKET CCCH LOAD IND Messages Sent
on Abis Interface
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Counter Description
A9201 Number of Uplink EGPRS TBF
Establishment Attempts
A9202 Number of Successful Uplink EGPRS TBFEstablishments
A9203 Number of Failed Uplink EGPRS TBF
Establishments due to No Channel
A9204 Number of Failed Uplink EGPRS TBF
Establishments due to MS No Response
A9205 Number of Uplink EGPRS TBF Normal
Releases
A9206 Number of Uplink EGPRS TBF Abnormal
Releases due to N3101 Overflow (MS NoResponse)
A9207 Number of Uplink EGPRS TBF Abnormal
Releases due to N3103 Overflow (MS No
Response)
A9208 Number of Uplink EGPRS TBF Abnormal
Releases due to SUSPEND
A9209 Number of Uplink EGPRS TBF Abnormal
Releases due to FLUSH
A9210 Number of Uplink EGPRS TBF AbnormalReleases due to No Channel
A9211 Total Number of Sampled Concurrent Uplink
EGPRS TBFs
A9212 Sampling Times of Concurrent Uplink
EGPRS TBFs
AA9213 Average Number of Concurrent Uplink
EGPRS TBFs
A9214 Total Duration of Uplink EGPRS TBF (ms)
AA9215 Average Duration of Uplink EGPRS TBF (s)
A9301 Number of Downlink EGPRS TBF
Establishment Attempts
A9302 Number of Successful Downlink EGPRS
TBF Establishments
A9303 Number of Failed Downlink EGPRS TBF
Establishments due to No Channel
A9304 Number of Failed Downlink EGPRS TBF
Establishments due to MS No Response
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Counter Description
A9305 Number of Downlink EGPRS TBF Normal
Releases
A9306 Number of Downlink EGPRS TBF AbnormalReleases due to N3105 Overflow
A9307 Number of Downlink EGPRS TBF Abnormal
Releases due to SUSPEND
A9308 Number of Downlink EGPRS TBF Abnormal
Releases due to FLUSH
A9309 Number of Downlink EGPRS TBF Abnormal
Releases due to No Channel
A9310 Total Number of Sampled Concurrent
Downlink EGPRS TBFs
A9311 Sampling Times of Concurrent Downlink
EGPRS TBFs
AA9312 Average Number of Concurrent Downlink
EGPRS TBFs
A9313 Total Duration of Downlink EGPRS TBF
(ms)
AA9314 Average Duration of Downlink EGPRS TBF
(s)
L9201 Total Number of Uplink EGPRS RLC Data
Blocks
L9202 Total Number of Uplink EGPRS MCS1 RLC
Data Blocks
L9203 Total Number of Uplink EGPRS MCS2 RLC
Data Blocks
L9204 Total Number of Uplink EGPRS MCS3 RLC
Data Blocks
L9205 Total Number of Uplink EGPRS MCS4 RLCData Blocks
L9206 Total Number of Uplink EGPRS MCS5 RLC
Data Blocks
L9207 Total Number of Uplink EGPRS MCS6 RLC
Data Blocks
L9208 Total Number of Uplink EGPRS MCS7 RLC
Data Blocks
L9209 Total Number of Uplink EGPRS MCS8 RLC
Data Blocks
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Counter Description
L9210 Total Number of Uplink EGPRS MCS9 RLC
Data Blocks
L9211 Total Number of Valid Uplink EGPRS MCS1RLC Data Blocks
L9212 Total Number of Valid Uplink EGPRS MCS2
RLC Data Blocks
L9213 Total Number of Valid Uplink EGPRS MCS3
RLC Data Blocks
L9214 Total Number of Valid Uplink EGPRS MCS4
RLC Data Blocks
L9215 Total Number of Valid Uplink EGPRS MCS5
RLC Data Blocks
L9216 Total Number of Valid Uplink EGPRS MCS6
RLC Data Blocks
L9217 Total Number of Valid Uplink EGPRS MCS7
RLC Data Blocks
L9218 Total Number of Valid Uplink EGPRS MCS8
RLC Data Blocks
L9219 Total Number of Valid Uplink EGPRS MCS9
RLC Data Blocks
RL9220 Retransmission Rate of Uplink EGPRS
MCS1 RLC Data Block (%)
RL9221 Retransmission Rate of Uplink EGPRS
MCS2 RLC Data Block (%)
RL9222 Retransmission Rate of Uplink EGPRS
MCS3 RLC Data Block (%)
RL9223 Retransmission Rate of Uplink EGPRS
MCS4 RLC Data Block (%)
RL9224 Retransmission Rate of Uplink EGPRSMCS5 RLC Data Block (%)
RL9225 Retransmission Rate of Uplink EGPRS
MCS6 RLC Data Block (%)
RL9226 Retransmission Rate of Uplink EGPRS
MCS7 RLC Data Block (%)
RL9227 Retransmission Rate of Uplink EGPRS
MCS8 RLC Data Block (%)
RL9228 Retransmission Rate of Uplink EGPRS
MCS9 RLC Data Block (%)
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Counter Description
L9229 Number of MCS Upgrades on Uplink EGPRS
TBF
L9230 Number of MCS Degrades on Uplink EGPRSTBF
L9231 Number of Uplink EGPRS RLC Control
Blocks
TL9232 Average Throughput of Uplink EGPRS RLC
(kbit/s)
TL9233 Average Payload of Single Uplink EGPRS
TBF (KB)
L9234 Total Number of Uplink EGPRS TBFs
L9301 Total Number of Downlink EGPRS RLC
Data Blocks
L9302 Total Number of Downlink EGPRS MCS1
RLC Data Blocks
L9303 Total Number of Downlink EGPRS MCS2
RLC Data Blocks
L9304 Total Number of Downlink EGPRS MCS3
RLC Data Blocks
L9305 Total Number of Downlink EGPRS MCS4RLC Data Blocks
L9306 Total Number of Downlink EGPRS MCS5
RLC Data Blocks
L9307 Total Number of Downlink EGPRS MCS6
RLC data blocks
L9308 Total Number of Downlink EGPRS MCS7
RLC Data Blocks
L9309 Total Number of Downlink EGPRS MCS8
RLC Data Blocks
L9310 Total Number of Downlink EGPRS MCS9
RLC Data Blocks
L9311 Total Number of Valid Downlink EGPRS
MCS1 RLC Data Blocks
L9312 Total Number of Valid Downlink EGPRS
MCS2 RLC Data Blocks
L9313 Total Number of Valid Downlink EGPRS
MCS3 RLC Data Blocks
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Counter Description
L9314 Total Number of Valid Downlink EGPRS
MCS4 RLC Data Blocks
L9315 Total Number of Valid Downlink EGPRSMCS5 RLC Data Blocks
L9316 Total Number of Valid Downlink EGPRS
MCS6 RLC Data Blocks
L9317 Total Number of Valid Downlink EGPRS
MCS7 RLC Data Blocks
L9318 Total Number of Valid Downlink EGPRS
MCS8 RLC Data Blocks
L9319 Total Number of Valid Downlink EGPRS
MCS9 RLC Data Blocks
RL9320 Retransmission Rate of Downlink EGPRS
MCS1 RLC Data Blocks (%)
RL9321 Retransmission Rate of Downlink EGPRS
MCS2 RLC Data Blocks (%)
RL9322 Retransmission Rate of Downlink EGPRS
MCS3 RLC Data Blocks (%)
RL9323 Retransmission Rate of Downlink EGPRS
MCS4 RLC Data Blocks (%)
RL9324 Retransmission Rate of Downlink EGPRS
MCS5 RLC Data Blocks (%)
RL9325 Retransmission Rate of Downlink EGPRS
MCS6 RLC Data Blocks (%)
RL9326 Retransmission Rate of Downlink EGPRS
MCS7 RLC Data Blocks (%)
RL9327 Retransmission Rate of Downlink EGPRS
MCS8 RLC Data Blocks (%)
RL9328 Retransmission Rate of Downlink EGPRSMCS9 RLC Data Blocks (%)
L9329 Number of MCS Upgrades on Downlink
EGPRS TBF
L9330 Number of MCS Degrades on Downlink
EGPRS TBF
L9331 Number of Downlink EGPRS RLC Control
Blocks
L9332 Number of Downlink EGPRS RLC Dummy
Blocks
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Counter Description
TL9333 Average Throughput of Downlink EGPRS
RLC (kbit/s)
TL9334 Average Payload of Single Downlink EGPRSTBF (KB)
L9335 Total Number of Downlink EGPRS TBFs
S9101 Number of Times 8PSK_MEAN_BEP=1
S9102 Number of Times 8PSK_MEAN_BEP=2
S9103 Number of Times 8PSK_MEAN_BEP=3
S9104 Number of Times 8PSK_MEAN_BEP=4
S9105 Number of Times 8PSK_MEAN_BEP=5S9106 Number of Times 8PSK_MEAN_BEP=6
S9107 Number of Times 8PSK_MEAN_BEP=7
S9108 Number of Times 8PSK_MEAN_BEP=8
S9109 Number of Times 8PSK_MEAN_BEP=9
S9110 Number of Times 8PSK_MEAN_BEP=10
S9111 Number of Times 8PSK_MEAN_BEP=11
S9112 Number of Times 8PSK_MEAN_BEP=12
S9113 Number of Times 8PSK_MEAN_BEP=13
S9114 Number of Times 8PSK_MEAN_BEP=14
S9115 Number of Times 8PSK_MEAN_BEP=15
S9116 Number of Times 8PSK_MEAN_BEP=16
S9117 Number of Times 8PSK_MEAN_BEP=17
S9118 Number of Times 8PSK_MEAN_BEP=18
S9119 Number of Times 8PSK_MEAN_BEP=19
S9120 Number of Times 8PSK_MEAN_BEP=20
S9121 Number of Times 8PSK_MEAN_BEP=21
S9122 Number of Times 8PSK_MEAN_BEP=22
S9123 Number of Times 8PSK_MEAN_BEP=23
S9124 Number of Times 8PSK_MEAN_BEP=24
S9125 Number of Times 8PSK_MEAN_BEP=25
S9126 Number of Times 8PSK_MEAN_BEP=26
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Counter Description
S9127 Number of Times 8PSK_MEAN_BEP=27
S9128 Number of Times 8PSK_MEAN_BEP=28
S9129 Number of Times 8PSK_MEAN_BEP=29
S9130 Number of Times 8PSK_MEAN_BEP=30
S9131 Number of Times 8PSK_MEAN_BEP=31
S9132 Number of Times 8PSK_MEAN_BEP=32
Table 20-9 Counters related to the external PCU
Counter Description
AR3015A Mean Number of Dynamically Configured
Channels (EDGE) (900/850 Cell)
AR3015B Mean Number of Dynamically Configured
Channels (EDGE) (1800/1900 Cell)
CR3015 Mean Number of Dynamically Configured
Channels (EDGE)
AR3025A Mean Number of Available Channels
(EDGE) (900/850 Cell)
AR3025B Mean Number of Available Channels
(EDGE) (1800/1900 Cell)
CR3025 Mean Number of Available Channels
(EDGE)
R3005A Number of Initially Configured Channels
(Static EDGE) (900/850 Cell)
R3005B Number of Initially Configured Channels
(Static EDGE) (1800/1900 Cell)
R3006A Number of Initially Configured Channels(Dynamic EDGE) (900/850 Cell)
R3006B Number of Initially Configured Channels
(Dynamic EDGE) (1800/1900 Cell)
CR3005 Number of Initially Configured Channels
(Static EDGE)
CR3006 Number of Initially Configured Channels
(Dynamic EDGE)
AL8351 Mean Number of Faulty Circuits on the Pb
Interface
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Counter Description
AL8353 Mean Number of Blocked Circuits on the Pb
Interface
AL8354 Mean Number of Idle Circuits on the PbInterface
AL8355 Mean Number of Busy Circuits on the Pb
Interface
AL8352 Mean Number of Circuits in Maintenance
State on the Pb Interface
L0387 Total Number of Messages Received from
PCU
L8387 Messages Received from a PCU
R3140 Requests for TCH from the PCU
R3141 Successful Requests for TCH from the PCU
AR3011A Mean Number of Dynamically Configured
Channels (PDCH) (900/850 Cell)
AR3011B Mean Number of Dynamically Configured
Channels (PDCH) (1800/1900 Cell)
CR3011 Mean Number of Dynamically Configured
Channels (PDCH)
AR3021A Mean Number of Available Channels
(PDCH) (900/850 Cell)
AR3021B Mean Number of Available Channels
(PDCH) (1800/1900 Cell)
CR3021 Mean Number of Available Channels
(PDCH)
R3001A Number of Initially Configured Channels
(Static PDCH) (900/850 Cell)
R3001B Number of Initially Configured Channels
(Static PDCH) (1800/1900 Cell)
R3002A Number of Initially Configured Channels
(Dynamic PDCH) (900/850 Cell)
R3002B Number of Initially Configured Channels
(Dynamic PDCH) (1800/1900 Cell)
CR3001 Number of Initially Configured Channels
(Static PDCH)
CR3002 Number of Initially Configured Channels
(Dynamic PDCH)
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Counter Description
ZTA331 Paging Requests on the Abis Interface per
BSC (PS Service)
ZTA301H Immediate Assignment Commands per BSC(PS Service)
ZTL3188D PCH Overloads due to PS Service Counted
through the Indications from the Abis
Interface per BSC
20.8 References
The references indicate the documents about EDGE from the related standard organizations.
The references are as follows:
3GPP TS 50.059
"Enhanced Data rates for GSM Evolution (EDGE); Project scheduling and open issues for
EDGE"
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21 Co-BCCH CellAbout This Chapter
21.1 Overview
This describes the definition and purposes of the Co-BCCH cell. The Co-BCCH cell adopts the
dual-band technique and features expanded cell capacity and minimized handover occurrences.
21.2 Availability
This lists the NEs, software, and hardware configuration of the BTS required for the
implementation of the Co-BCCH cell.
21.3 ImpactThis describes the impact of the Co-BCCH cell on system performance.
21.4 Technical Description
This describes the implementation of channel assignment and handover.
21.5 Capabilities
None.
21.6 Implementation
This describes the configuration principle, configuration preparation, scenario analysis,
configuration procedure, and deactivation of the Co-BCCH cell.
21.7 Maintenance InformationThis lists the performance counters related to the Co-BCCH cell.
21.8 References
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21.1 Overview
This describes the definition and purposes of the Co-BCCH cell. The Co-BCCH cell adopts the
dual-band technique and features expanded cell capacity and minimized handover occurrences.
Definition
The Co-BCCH cell refers to a cell where the GSM900&DCS1800 TRXs coexist (or
GSM850&DCS1800, GSM850&PCS1900). The TRXs on the two bands use one main BCCH.
In a dual-band network, a dual-band MS can work on either of the bands. A single-band MS can
also work normally on its band.
The GSM900 band consists of the P-GSM, E-GSM, and R-GSM.
PurposesThe Co-BCCH cell improves the continuous coverage and sparse coverage in hot spots.
With the rapid increase of mobile users, the dual-band network solution becomes a growing
trend around the globe. The dual-band network has the following three networking modes:
l Independent MSC Networking
l Co-MSC Independent BSC Networking
l Co-BSC Networking
The highlight of the dual-band network with the Co-BCCH cell is that the primary frequency
band and the secondary frequency band are the same and they coexist in one cell. The secondary
frequency band is the extension of the primary frequency band. This feature eliminates the
technical bottleneck on cell reselection and handover in other networking modes. Specifically,
the advantages of the dual-band network with the Co-BCCH cell are listed as follows:
l The capacity of the cell is expanded and the occurrences of cell reselection for the MS are
reduced.
For example, a site is configured with a GSM900 cell and a DCS1800 cell. Each cell is
configured with two TRXs. You can obtain the data as listed in Table 21-1 when querying
the ERLANG B.
Table 21-1 Data in ERLANG B
Networking Mode
QuantityofBCCHs
QuantityofSDCCHs
Quantityof TCHs
Call LossRate
Traffic Volume
Common
dual-band
network
2 2 28 2% 16.40 ERL
Dual-band
network
with Co-
BCCH
cell
1 2 29 2% 21.04 ERL
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l The inter-cell handover occurrences are reduced.
When an MS initiates a handover request, the MS is handed over to the channels on the
other frequency band in the serving cell.
l The number of the BCCH TRXs is reduced and the interference caused by the BCCH TRXs
is reduced.
l Convenient maintenance
The number of cells and neighboring cells of the Co-BCCH cell network is less than that
of the common dual-band network. Thus, the maintenance workload is reduced.
The system assigns channels on different frequency bands to the MS based on the RX level, RX
quality and TA value. The underlaid subcell is used for cell coverage and the overlaid subcell
is used for traffic absorption. Thus, the cell coverage is maximized and the capacity balance
between the overlaid subcell and the underlaid subcell is maintained.
Terms
Terms Definition
M criteria Indicates a criteria that selects only the neighbor cells of which the
RX level is higher than the lowest MS RX level threshold and sorts
the qualified cells in the candidate cell list. The serving cell and
neighbor cells are sorted based on the RX level.
ERLANG B Indicates the relation among the number of common channels, call
loss rate, and traffic volume in busy hours. The ERLANG B is
developed from the ERLANG call loss formula.
Primary frequency
band
Indicates the frequency band containing the main BCCH frequency
in a Co-BCCH cell.
Secondary frequency
band
Indicates the frequency band that does not contain the main BCCH
frequency in a Co-BCCH cell.
Acronyms and Abbreviations
Acronyms and Abbreviations Full Spelling
BCCH Broadcast Control Channel
SDCCH Stand-alone Dedicated Control Channel
PBGT Power Budget
BQ Bad Quality
MR Measurement Report
TA Timing Advance
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21.2 Availability
This lists the NEs, software, and hardware configuration of the BTS required for the
implementation of the Co-BCCH cell.
NEs Involved
Table 21-2 lists the network elements involved in the Co-BCCH cell.
Table 21-2 NEs involved in Co-BCCH cell
MS BTS BSC MSC MGW SGSN GGSN HLR
- √ √ - - - - -
NOTE
l -: not involved
l √: involved
Software Releases
Table 21-3 lists the NEs and software versions that support Co-BCCH cell.
Table 21-3 GBSS products and software versions
Product Version
BSC BSC6000 V900R008C01 and later releases
BTS BTS3012 DTRU BTS3000V100R001C01 and later releases
QTRU BTS3000V100R008C01 and later releases
BTS3012 DTRU BTS3000V100R001C04 and later releases
QTRU BTS3000V100R008C01 and later releases
BTS3006C BTS3000V100R002C01 and later releases
BTS3002E BTS3000V100R008C01 and later releases
DBS3900 GSM BTS3000V100R008C01 and later releases
BTS3900 GSM BTS3000V100R008C02 and later releases
BTS3900A GSM BTS3000V100R008C02 and later releases
BTS2X All releases
BTS3001C All releases
BTS3002C All releases
21 Co-BCCH Cell
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Product Version
BTS3X All releases
Double-transceiver BTSs All releases
Miscellaneous
The BTS must meet the following requirements if you configure Co-BCCH.
l Number of TRXs
The number of GSM900 TRXs or DCS1800 TRXs should be less than or equal to four in
a Co-BCCH cell. If the number exceeds four, enough antenna output ports and antenna
models are required. The coverage of the TRXs on the same frequency band should be the
same in the case of antenna installation.
l Antenna types and azimuth
– If the GSM900 TRX and the DCS1800 TRX use the same antenna, the dual-band
antenna is required.
– If the GSM900 TRX and the DCS1800 TRX use the antenna respectively, either the
dual-band antenna or the single-band antenna is allowed. When the sing-band antenna
is used, the azimuth of the antennas used for the GSM900 TRX and the DCS1800 TRX
in the same cell must be the same.
l Type of the combiner
As a combiner cannot support the GSM900 and the DCS1800 at the same time, the GSM900
TRX and the DCS1800 TRX must use different combiners.
l Combination mode
The combination mode of the TRXs on the same frequency band in a cell must be the same.
Otherwise, the TX power levels of the TRXs on the same frequency band in a cell are not
consistent, and the coverage of these TRXs is not consistent. Thus, the Co-BCCH cell
cannot be enabled because of a 3-layer or more-layer concentric cell.
21.3 Impact
This describes the impact of the Co-BCCH cell on system performance.
Impact on System Performance
The impact of the Co-BCCH cell on system performance is as follows:
l Co-BCCH cell can be applied to specific scenarios only. If Co-BCCH is applied to
unqualified scenarios, the network KPI is deteriorated.
For details of the application scenarios of the Co-BCCH, refer to 21.6.3 Risk Analysis of
the Configuration Scenarios.
l The neighboring cell of the Co-BCCH cell is limited.
The neighboring cell of the Co-BCCH cell cannot be GSM900 cell or DCS1800 cell.Otherwise, the traffic volume is unbalanced.
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NOTE
If the GSM900 cell and the DCS1800 cell are at the same layer, they can be neighboring cell of the
Co-BCCH cell.
For details of network layer and network hierarchy, refer to 7.3.2.10 Fast-Moving Micro Cell
Handover.
l The configuration of network optimization parameters of the Co-BCCH cell is more
difficult than that of the common cell.
Impact on Other Features
The Co-BCCH cell and the double-timeslot cell cannot coexist.
21.4 Technical Description
This describes the implementation of channel assignment and handover.
21.4.1 GSM900/DSC1800 Co-BCCH Cell Channel Assignment
This describes the Co-BCCH cell channel assignment. Channel assignment strategy of the Co-
BCCH cell complies with the channel assignment algorithm of the concentric cell and is
associated with the frequency band supported by the MS.
The GSM900&DCS1800 (or GSM850&DCS1800, GSM850&PCS1900) Co-BCCH cell is
realized based on the principles of the concentric cell, which are described as follows:
l GSM900 (or GSM850) TRXs are configured in the underlaid subcell for network coverage.
l DCS1800 (or PCS1900) TRXs are configured in the overlaid subcell for traffic absorption.
Therefore, the channel assignment of the Co-BCCH cell should comply with the channel
assignment strategy of the concentric cell. Before the channel assignment, however, the network
needs to determine the frequency bands supported by the MS. If the MS supports the bands in
the underlaid and overlaid subcell, the channel assignment strategy of the concentric cell is
applied. Otherwise, the network assigns only the channels in the underlaid subcell to the MS.
Immediate Assignment
In the immediate assignment procedure, the BSC does not receive any information about the
MS. If TA exists, the BSC assigns underlaid or overlaid channels to the MS based on TA. The
BSC preferentially assigns the channels in the underlaid subcell to the MS to ensure that theconversation can be established.
Assignment
In the assignment procedure, the channel assignment is related to MS classmark 3.
l If the BSC does not obtain MS classmark 3, or if MS classmark 3 indicates that the MS
supports only the underlaid frequency band, then the BSC assigns only the underlaid
channels to the MS.
l If MS classmark 3 indicates that the MS supports the underlaid and overlaid frequency
bands, the BSC assigns underlaid or overlaid channels to the MS based on AssignOptimum Layer and Assign-optimum-level Threshold.
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Incoming Internal Inter-Cell Handover
In the incoming internal inter-cell handover procedure, the channel assignment is related to MS
classmark 3.
l If the BSC does not obtain MS classmark 3, or if MS classmark 3 indicates that the MSsupports only the underlaid frequency band, then the BSC assigns only the underlaid
channels to the MS.
l If MS classmark 3 indicates that the MS supports the underlaid and overlaid frequency
bands, the BSC assigns underlaid or overlaid channels to the MS based on Pref. Subcell
in HO of Intra-BSC.
Because the inter-cell handover is generally triggered on the cell edge, you are advised to set
the Pref. Subcell in HO of Intra-BSC to Underlaid Subcell.
Incoming External Inter-Cell Handover
In the incoming external inter-cell handover procedure, the channel assignment is related to MSclassmark 3.
l If the BSC does not obtain MS classmark 3, or if MS classmark 3 indicates that the MS
supports only the underlaid frequency band, then the BSC assigns only the underlaid
channels to the MS.
l If MS classmark 3 indicates that the MS supports the underlaid and overlaid frequency
bands, the BSC assigns underlaid or overlaid channels to the MS based on Incoming-to-
BSC HO Optimum Layer.
Because the inter-cell handover is generally triggered on the cell edge, you are advised to set
the Incoming-to-BSC HO Optimum Layer to Underlaid Subcell.
21.4.2 GSM900/DCS1800 Co-BCCH Cell Handover
This describes the GSM900/DCS1800 Co-BCCH cell handover. The Co-BCCH cell handover
is based on the handover algorithm of the concentric cell.
Neighbor Cell Selection
Based on the M criteria, the actual RX level of the serving cell is used for the handover decision
and the RX level of the neighbor cells is used for neighbor cell queuing, no matter the MS is
located in the overlaid subcell or the underlaid subcell. When the MS is in the overlaid subcell,
the underlaid subcell is handled as a special neighbor cell.
Handover Within an Enhanced Concentric Cell
The underlaid subcell can provide better speech quality in a concentric cell. Therefore, the
utilization ratio of the underlaid subcell is maximized.
The underlaid-to-overlaid subcell handover occurs only when the traffic volume in the underlaid
cell is high, the RX level of the MS is high, the RX quality of the MS is good, and the TA value
is low. In other words, all the following conditions must be met:
l DL RX Level ≥ UtoO HO Received Level Threshold
This condition is controlled by RX_LEV for UO HO Allowed.
l DL RX Quality < RX_QUAL Threshold
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This condition is controlled by RX_QUAL for UO HO Allowed.
l TA < (TA Threshold – TA Hysteresis)
This condition is controlled by TA for UO HO Allowed.
l Traffic of the underlaid subcell > Tch Traffic Busy Underlay Threshold
This condition is controlled by Underlaid Subcell HO Step Period (s) and Underlaid
Subcell HO Step Level.
If the serving cell has the highest priority in the neighbor cell queue, the overlaid-to-underlaid
subcell handover occurs when the RX level of the MS, the RX quality of the MS, or the TA
deteriorates. In other words, one of the following conditions should be met:
l DL RX Level < OtoU HO Received Level Threshold
This condition is controlled by RX_LEV for UO HO Allowed.
l DL RX Quality ≥ RX_QUAL Threshold
This condition is controlled by RX_QUAL for UO HO Allowed.
l TA ≥ (TA Threshold – TA Hysteresis)
This condition is controlled by TA for UO HO Allowed.
If the serving cell does not have the highest priority in the neighbor cell queue, the MS is handed
over to another neighbor cell.
Inter-Subcell Handover
The actual RX level of the cell is used for all the handover decision algorithms except the PBGT
handover decision algorithm.
The PBGT algorithm calculates the path loss of the neighbor cell at the same layer and hierarchy
by using the RX level of the underlaid cell for handover decision. Because of fast fading of thesignal level transmitted by the DCS1800 TRXs in the overlaid subcell, the handover decision
based on the actual RX level in the overlaid subcell is improper when compared with the RX
level in a neighbor cell. To ensure the accuracy of the PBGT handover decision, the handover
decision should be based on the RX level in the underlaid subcell.
For the incoming inter-cell handover and the incoming-to-BSC handover in the Co-BCCH cell,
to avoid a low handover success rate due to inaccurate signal level of the target cell, set Pref.
Subcell in HO of Intra-BSC and Incoming-to-BSC HO Optimum Layer to Underlaid
Subcell.
21.5 Capabilities None.
21.6 ImplementationThis describes the configuration principle, configuration preparation, scenario analysis,
configuration procedure, and deactivation of the Co-BCCH cell.
21.6.1 Configuration Principles
This describes the configuration principles of the Co-BCCH cell.
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A Co-BCCH cell consists of an overlaid subcell and an underlaid subcell. The specific band
configuration is as follows:
l If the overlaid subcell is configured with the DCS1800 TRX, the underlaid subcell is
configured with the GSM900 or GSM850 TRX.
l If the overlaid subcell is configured with the PCS1900 TRX, the underlaid subcell is
configured with the GSM850 TRX.
NOTE
The path loss of the DCS1800 TRX is fast. At the distance of 0.5 to 1 km, the signal power of the DCS1800
TRX is about 15 dB less than the signal power of the GSM900 TRX.
Configure the Co-BCCH cell based on the following principles:
l Generally, do not assign the overlaid subcell channel to a call, do not assign the incoming
inter-cell handover request directly to the overlaid subcell, and do not forcibly assign a call
beyond coverage of the DCS1800 TRX to the overlaid subcell.
l
Properly assign the traffic volume in the underlaid subcell and the overlaid subcell tomaintain the traffic balance between the overlaid subcell and the underlaid subcell.
l Configure the BCCH in the GSM900 TRX. The priority of the TRX types from high to low
is: P-GSM, E-GSM, and R-GSM.
l Configure the SDCCH, PDCH, and BCCH in the same TRX.
l The frequency hopping between the GSM900 frequencies and the DCS1800 frequencies
is not allowed. The frequency hopping between frequencies within the same frequency
band is allowed.
l Prevent a multi-layer concentric cell due to inconsistent combination mode of the TRXs
on the same frequency band. A multi-layer concentric cell deteriorates the network KPI,
such as handover success rate and assignment success rate.
21.6.2 Preparations for the Configuration
This describes the preparations for configuring the Co-BCCH cell. You are required to be
familiar with the related information based on which the parameter configuration is performed.
Get familiar with the state of the current cell, which includes the following items:
l User distribution and traffic volume in the coverage area of the site
l Ratio of the coverage of the DCS1800/PCS1900 TRX to the coverage of the entire cell
l Ratio of the coverage of the GSM900/GSM850 TRX to the coverage of the entire cell
l Whether the GSM900/GSM850 TRXs can carry all the traffic in the cell.
l Number of the GSM900/GSM850 TRXs and the DCS1800/PCS1900 TRXs. Whether the
frequency reuse on the GSM900/GSM850 band is tight and whether the interference exists.
Pay attention to the following restrictions on network planning:
l Number of TRXs
– If the traffic is distributed mainly in the overlaid subcell and if the congestion is unlikely
to occur in the underlaid subcell, the number of TRXs configured in the underlaid subcell
can be small.
– If the traffic volume in the underlaid subcell is high, the TRXs in the underlaid subcell
should outnumber or be equal to the TRXs in the overlaid subcell to prevent thecongestion in the underlaid subcell.
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– If the TRXs in the underlaid subcell are not enough, the TRXs in a fully-loaded underlaid
subcell are likely to be congested in high traffic hours. This deteriorates the network
KPIs, such as TCH Seizure Success Rate and handover success ratio.
l Neighbor cell
– This factor is neglectable if the Co-BCCH cell is not adjacent to two or more single- band cells at the same time.
– If the Co-BCCH cell is adjacent to two single-band cells using the two bands of the Co-
BCCH cell at the same time, you should consider the network hierarchy.
– This factor is neglectable if the Co-BCCH cell has a low priority.
– If the Co-BCCH cell is adjacent to two single-band cells using the two bands of the
Co-BCCH cell at the same time, you should consider the network hierarchy.
– You should consider the traffic load of neighbor cells if the Co-BCCH cell has
a high priority. If the traffic load of neighbor cells is high, the traffic distributed
on edge of a common cell is absorbed by the Co-BCCH cell. Thus, the TRXs in
the underlaid subcell are likely to be congested and the network KPIs, such asTCH Seizure Success Rate and handover success ratio are deteriorated. In this
case, the Co-BCCH cell is not recommended.
– If the Co-BCCH cell has to be used, you should analyze the traffic distribution
based on the congestion conditions in the underlaid subcell and then adjust the
handover parameters of related cells. The purpose is to prevent the calls on edge
of a common cell from being handed over to the Co-BCCH cell.
21.6.3 Risk Analysis of the Configuration Scenarios
This describes the risk analysis of the configuration scenarios. The configuration scenarios
consist of common and special scenarios.
In the Co-BCCH cell, two types of TRXs with different coverage capabilities are configured.
Therefore, the traffic volume of the overlaid and underlaid subcells should be properly assigned
without deteriorating the network KPIs. The traffic assignment of the overlaid and underlaid
subcells is influenced by two factors. One is the number of TRXs in the overlaid and underlaid
subcells, and the other is the actual coverage of the overlaid and underlaid subcells (represented
by the inter-site distance).
Risk Analysis in Common Scenarios
Table 21-4 lists the risk analysis in common scenarios.
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Table 21-4 Risk analysis in common scenarios
No.
ScenarioDescription
Scenario Analysis Risk Solution
1 The inter-
site distance
is within
800 m.
The coverage capability of
the DCS1800 TRXs is
equivalent to that of the
GSM900 TRXs.
Therefore, the underlaid-
to-overlaid or overlaid-to-
underlaid handover in the
Co-BCCH cell is unlikely
to fail.
There is no risk,
and the Co-
BCCH cell can
be enabled.
None
2 l The inter-
sitedistance
is from
800 m to
1,600 m.
l The
number
of TRXs
in the
underlaid
subcell is
equal to
or morethan the
number
of TRXs
in the
overlaid
subcell.
The overlaid subcell only
covers about half of thecoverage area of a Co-
BCCH cell. The underlaid
subcell configured with
enough TRXs can cover
the remaining area of a Co-
BCCH cell. Therefore, the
risk is low.
The risk is
small, and theCo-BCCH cell
can be enabled.
Assigns enough traffic
volume to the underlaidsubcell with
precondition that no
congestion occurs in
the underlaid subcell.
Thus, the risk of
underlaid-to-overlaid
handover in high traffic
hours is minimized.
Adjust UtoO HO
Received Level
Threshold to arrange
the traffic of theoverlaid and underlaid
subcells.
l If the value of this
parameter is
reduced, the number
of underlaid subcell
to overlaid subcell
handovers increases.
l If the value of this
parameter is
increased, thenumber of underlaid
subcell to overlaid
subcell handovers
decreases.
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No.
ScenarioDescription
Scenario Analysis Risk Solution
3 l The inter-
site
distance
is from
800 m to
1,600 m.
l The
number
of TRXs
in the
underlaid
subcell is
less thanthe
number
of TRXs
in the
overlaid
subcell.
The overlaid subcell only
covers about half of the
coverage area of a Co-
BCCH cell. The underlaid
subcell with few TRXs
may not (or just be able to)
cover the remaining area
of a Co-BCCH cell.
Therefore, most of the
traffic is handed over to
the overlaid subcell in high
traffic hours. Possible
risks are as follows:l Certain calls beyond the
coverage of the overlaid
subcell are likely to be
handed over to the
overlaid subcell and the
handover fails.
l With the increase of cell
traffic, the underlaid
subcell becomes badly
congested while the
overlaid subcell
remains idle. In
addition, the
performance indicators,
such as the underlaid-
to-overlaid handover
success rate and the
DCS1800 channel
seizure success rate are
deteriorated.
The risk is
medium, and
you are advised
not to enable the
Co-BCCH. If
you enable the
Co-BCCH, you
are advised to
enable halfrate
channels in the
underlaid
subcell or to add
underlaidTRXs.
Enable the half-rate
services or increase the
TRXs in the underlaid
subcell.
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No.
ScenarioDescription
Scenario Analysis Risk Solution
4 l The inter-
site
distance
is more
than
1,600 m.
l The
number
of TRXs
in the
underlaid
subcell is
equal toor more
than the
number
of TRXs
in the
overlaid
subcell.
The overlaid subcell
covers less than half of the
coverage area of a Co-
BCCH cell and the
underlaid subcell is
configured with enough
TRXs. Based on the
quantity and distribution
of users, either of the
following scenarios may
occur:
l Scenario 1
Most users are in theoverlaid subcell. The
TRXs of the underlaid
subcell can carry the
traffic in coverage of
the underlaid subcell. In
this situation, the
underlaid subcell
should carry most of the
traffic to reduce the risk
cause by the underlaid-
to-overlaid handover in
high traffic hours.
l Scenario 2
Users are distributed
evenly and the
underlaid subcell TRXs
cannot (or just be able
to) carry the traffic in
the coverage area of the
underlaid subcell. Thus,
the underlaid subcell
becomes badly
congested and theoverlaid subcell
remains idle. In
addition, the
performance indicators,
such as the underlaid-
to-overlaid handover
success rate and the
DCS1800 channel
seizure success rate are
deteriorated.
The risk is
medium.
l For scenario
1, the Co-
BCCH can be
enabled.
l For scenario
2, you are
advised not to
enable the
Co-BCCH. If
you enable
the Co-
BCCH, you
are advised to
enable
halfrate
channels in
the underlaid
subcell or to
add underlaid
TRXs.
None
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No.
ScenarioDescription
Scenario Analysis Risk Solution
5 l The inter-
site
distance
is more
than
1,600 m.
l The
number
of TRXs
in the
underlaid
subcell is
less thanthe
number
of TRXs
in the
overlaid
subcell.
The overlaid subcell
covers less than half of the
coverage area of a Co-
BCCH cell. The underlaid
subcell with few TRXs
cannot (or just be able to)
carry the traffic in the
coverage of the underlaid
subcell. Possible risks are
as follows:
l The underlaid subcell is
badly congested.
l The overlaid subcell
remains idle.
l The underlaid-to-
overlaid handover
success rate and the
DCS1800 channel
seizure success rate are
deteriorated.
The risk is large,
and the Co-
BCCH cannot
be enabled.
Enable the half-rate
services or increase the
TRXs in the underlaid
subcell.
The methods for determining the risks are as follows:
l In a common dual-band network, if the congestion does not occur in the overlaid or
underlaid subcell, the related performance indicators have no change after the Co-BCCH
cell is enabled.
l In a common dual-band network, if the congestion in the GSM900 subcell occurs at an
earlier time than in the DCS1800 subcell, a forcible traffic transfer from the GSM900
subcell to the DCS1800 subcell is likely to deteriorate the KPIs. In this case, related
performance indicators are deteriorated if the Co-BCCH cell is enabled. For example, the
underlaid-to-overlaid handover success rate and the DCS1800 channel seizure success rate
are reduced.
Risk Analysis in Special Scenarios
Use the following methods to eliminate problems which may occur when the Co-BCCH cell is
enabled in special scenarios:
l The TRXs number in the overlaid and underlaid subcells is equivalent and most of the
traffic should be assigned in the overlaid subcell.
You can lower the value of UtoO HO Received Level Threshold to increase the traffic
in the overlaid subcell. To avoid ping-pong handovers because of signal level fluctuation,
the value of OtoU HO Received Level Threshold should be less than 25.
l Severe interference exists in the GSM900 subcell.
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– You can suppress the interference to some extent by adjusting the parameters related to
concentric cell.
– When the inter-site distance is less than 1,000 m, add the traffic in the overlaid subcell.
NOTE
You can determine that the GSM900 channel is seriously interfered if the interference band is high,
the RX quality is bad, and the call drop rate is 1.2 times or more than the call drop rate of the DSC1800
channel.
l In a common dual-band network, only few cells are configured to be the Co-BCCH cells.
The neighbor cells are single-band or dual-band cells.
In a common dual-band network, the DCS1800 cell is at Level 2 and the GSM900 cell is
at level 3. That is, the DCS1800 cell level is higher than the GSM900 cell level. In this
situation, the following may occur when the Co-BCCH cell is enabled:
– If the Co-BCCH cell is set to level 2, the traffic absorption capability of the GSM900
TRX becomes enhanced. The traffic of the neighbor cells is absorbed. Thus, the traffic
volume of the cell increases sharply and related performance indicators are deteriorated.– If the Co-BCCH cell is set to level 3, the traffic in the coverage of the DCS1800 TRX
is absorbed by the neighbor cells. The cell traffic volume is decreased.
To avoid these risks, you must enable the Co-BCCH cell in the neighbor sites.
21.6.4 Configuring the Co-BCCH Cell
This describes how to configure the Co-BCCH cell on the BSC6000 Local Maintenance
Terminal.
Procedure
Step 1 Add a Co-BCCH cell
1. On the Management Tree tab page of the BSC6000 Local Maintenance Terminal, right-
click the target BTS and then choose Add Cell on the shortcut menu. The Add Cell dialog
box is displayed.
2. Click Add Cell. A dialog box is displayed, as shown in Figure 21-1.
Figure 21-1 Add New Cell dialog box
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NOTE
Figure 21-1 takes an example of external PCU. When the PCU is in built-in mode, there is no PCU
Name in Figure 21-1.
3. In Figure 21-1, set Frequency Band to GSM900&DCS1800 or GSM850&DCS1800,
and then click OK . The Add Cell dialog box is returned.
NOTE
If you select GSM850&PCS1900, you must set High Frequency Band to PCS1900.
4. Click Next. The Set Site Attributes dialog box is displayed.
5. Select a site from the Site List, and then click Set Site Device to set related parameters.
NOTE
You must set Add Chain and Manual Abis according to transmission path and customer
requirements.
Step 2 Configure cell attributes
1. Click Next. The Set Cell Attributes dialog box is displayed. Select cells from the Cells to
be set list box, and then click Set Cell Attributes. A dialog box is displayed, as shown in
Figure 21-2.
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Figure 21-2 Set Cell Attributes dialog box
2. Set BCCH IUO Attribute.
Step 3 Assign TRXs for the add cell
1. In the dialog box shown inFigure 21-2, click Frequency Config. A dialog box is displayed,
as shown in Figure 21-3.
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Figure 21-3 Set Cell Frequency dialog box
2. Select the GSM900 frequencies and DCS1800 frequencies, and then click OK to return to
the dialog box shown in Figure 21-2.
Step 4 Set the attributes of the newly assigned TRXs
1. In the dialog box shown in Figure 21-2, click TRX Config. A dialog box is displayed, as
shown in Figure 21-4.
Figure 21-4 Configure TRX Attributes dialog box (1)
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2. On the Frequency Attributes tab page, double-click a target frequency in Available
Frequencies to add the frequency to Assigned Frequencies.
3. On the Device Attributes tab page, check Value of the HW_Concentric Attri
Recommended