SRAN8.0 GSM Multi-mode Feature Description.pdf

SRAN8.0 GSM Multi-mode Feature
Description
Issue 04
Date 2013-07-19
HUAWEI TECHNOLOGIES CO., LTD.

Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Page 2 of 46
Copyright © Huawei Technologies Co., Ltd. 2013. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior
written consent of Huawei Technologies Co., Ltd.
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and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective
holders.
Notice
1. The purchased products, services and features are stipulated by the commercial contract made
between Huawei and the customer. All or partial products, services and features described in this
document may not be within the purchased scope or the usage scope. Unless otherwise agreed by the
contract, all statements, information, and recommendations in this document are provided "AS IS"
without warranties, guarantees or representations of any kind, either express or implied.
2. The information in this document is subject to change without notice. Every effort has been made in
the preparation of this document to ensure accuracy of the contents, but all statements, information,
and recommendations in this document do not constitute the warranty of any kind, express or implied.
3. Except for the special declaration, LTE in this document is regarded as LTE FDD.
4. Except for the special declaration, MRRU in this document is regarded as RRU3908 V1/V2,
RRU3928,RRU3929, RRU3926, RRU3942 or RRU3960.
5. Except for the special declaration, MRFU in this document is regarded as MFRU V1/V2, MRFUd or
MRFUe.
Huawei Technologies Co., Ltd.
Address: Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
P.R.C.
Website: http://www.huawei.com
Email: support@huawei.com

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Contents
6 Multi-mode Evolution..................................................................................................................4
6.1 GSM Multi-mode basic features ......................................................................................................................4
6.1.1 MRFD-210001 Multi-mode BS Common CPRI Interface(GBTS).........................................................4
6.1.2 MRFD-210002 Multi-mode BS RRU/RFU star-connection with separate CPRI Interface(GBTS).......5
6.2 Easy Refarming................................................................................................................................................8
6.2.1 MRFD-211801 Multi-mode Dynamic Power Sharing(GSM).................................................................8
6.2.2 MRFD-211802 GSM and UMTS Dynamic Spectrum Sharing(GSM) .................................................10
6.2.3 MRFD-211803 Dynamic MA for GU Dynamic Spectrum Sharing(GSM)...........................................12
6.2.4 MRFD-211804 GSM Power Control on Interference Frequency for GU Small Frequency gap(GSM)14
6.2.5 MRFD-211703 2.0MHz Central Frequency point separation between GSM and UMTS mode(GSM)16
6.2.6 MRFD-211806 GSM and LTE Dynamic Power Sharing(GSM)...........................................................18
6.3 SingleSite .......................................................................................................................................................20
6.3.1 MRFD-211501 IP-Based Multi-mode Co-Transmission on BS side(GBTS) .......................................20
6.3.2 MRFD-211504 TDM-Based Multi-mode Co-Transmission via Backplane on BS side(GBTS)...........27
6.3.3 MRFD-211505 Bandwidth sharing of MBTS Multi-mode Co-Transmission(GBTS)..........................28
6.3.4 MRFD-211601 Multi-mode BS Common Reference Clock(GBTS) ....................................................35
6.3.5 MRFD-211602 Multi-mode BS Common IPSec (GSM)......................................................................41
6.4 Power Consumption Saving...........................................................................................................................43
6.4.1 MRFD-211901 Multi-RAT Carrier Joint Intelligent Shutdown (GBTS) ..............................................43
7 Acronyms and Abbreviations...................................................................................................45

SRAN8.0 GSM Multi-mode Feature Description
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6 Multi-mode Evolution
6.1 GSM Multi-mode basic features
6.1.1 MRFD-210001 Multi-mode BS Common CPRI Interface(GBTS)
Availability
This feature is available from SRAN1.0.
this feature is cancelled from SRAN2.0 and replaced by feature "MRFD-210002 Multi-mode
BS RRU/RFU star-connection with separate CPRI interface(GBTS)"
1. GBTS and NodeB Common CPRI Interface
Summary
Multi-mode RRU connect with BBU by 2G/3Gcommon separate CPRI interface when works
on the GU mode.
Benefits
For traditional GSM and UMTS dual mode solution, RF modules supporting different mode is
needed, thus CPRI interface data for different mode is necessary to be carried on different
fiber. With this feature, fibers can be saved of dual mode application. The corresponding fiber
installation and maintenance cost can be saved.
Description
The data transmitted between BBU and RRU module for 2G mode and 3G modes can be
shared on the same fiber. The GTMU transfer the data of 3G mode for both uplink direction
and downlink direction.

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WBBP
WBBP
UFAN
UPEU
WBBP
WBBP
WMPT
GTMU
R
R
U
R
R
U
R
R
U
BBU
CPRI
Enhancement
None
Dependency
Impacts on the MBSC hardware
None
Impacts on the MBTS hardware
Only DBS3900 support
Dependency on other features of the GBSS/RAN
None
Dependency on other NEs
None
Dependency on the other Modes
This feature has to be activated with MRFD-220001 Multi-mode BS Common CPRI
Interface(NodeB) simultaneously
6.1.2 MRFD-210002 Multi-mode BS RRU/RFU star-connection with
separate CPRI Interface(GBTS)
Availability

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1. GBTS and NodeB RRU/RFU star-connection with separate CPRI Interface
Summary
GSM and UMTS Multi-mode RRU/RFU star-connection with separate CPRI interface.
Benefits
GSM and UMTS data transmit on the CPRI interface are separate, thus the GSM and UMTS
can work in the concurrent mode in the same RF module without impact on each other when
new mode is introduced. Also it will expand the interface number when working in the GU
concurrent mode.
Description
GSM and UMTS Multi-mode RRU/RFU star-connection with separate CPRI interface to
BBU.
Enhancement
UBRI is supported in SRAN3.0 to expand CPRI interface number of GSM mode for the dual
mode networking scenario.
Dependency
None
WBBP
WBBP
UFAN
WBBP
WBBP
WMPT
GTMU
UPEU
R
F
U
/
R
R
U
R
F
U
/
R
R
U
R
F
U
/
R
R
U
BBU
GSM data
UMTS data

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For dual mode scenario, if RF modules
（MRFU/MRRU）working in GSM mode is more than
6, UBRI is needed
None
None
Dependency on other Modes
This feature has to be activated with MRFD-220002 Multi-mode BS RRU/RFU
star-connection with separate CPRI interface(NodeB) simultaneously
2. GBTS and eNodeB RRU/RFU star-connection with separate CPRI Interface
Summary
GSM and LTE Multi-mode RRU/RFU star-connection with separate CPRI interface.
Benefits
GSM and LTE data transmit on the CPRI interface are separate, thus the GSM and LTE can
work in the concurrent mode in the same RF module without impact on each other when new
mode is introduced. Also it will expand the interface number when working in the GL
concurrent mode.
Description
GSM and LTE Multi-mode RRU/RFU star-connection with separate CPRI interface to BBU.
LBBP
LBBP
UFAN
LBBP
LBBP
LMPT
GTMU
UPEU
R
F
U
/
R
R
U
R
F
U
/
R
R
U
R
F
U
/
R
R
U
BBU
GSM data
LTE data

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Enhancement
UBRI is supported in SRAN3.0 to expand CPRI interface number of GSM mode for the dual
mode networking scenario.
Dependency
None
For dual mode scenario, if RF modules
（MRFU/MRRU）working in GSM mode is more than
6, UBRI is needed
None
None
This feature has to be activated with MRFD-230002 Multi-mode BS RRU/RFU
star-connection with separate CPRI interface(eNodeB) simultaneously
6.2 Easy Refarming
6.2.1 MRFD-211801 Multi-mode Dynamic Power Sharing(GSM)
Availability
1. GSM and UMTS Dynamic Power Sharing
Summary
This feature enables power sharing between GSM TRX and UMTS carrier to improve the
utilization of power resources from SRAN5.0.
Benefits
This feature improves the network performance and the utilization of the PA power.
Because of more power can be used for data service, the average throughput and edge
throughput of UMTS cell will be increased. As below simulation result in the lab, the cell
average throughput increases up to 10% .
 Typical configuration: G4U1（GSM BCCH carrier is excluded）
 GSM，UMTS cell trasmitter power: 20W

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Scenario
MAX Cell
transmitter
Power(W)
PCPICH
transmitter
Power(W)
MAC-hs cell
average
throughput(kbps)
Without DPS 20 2 2582.1
With DPS 30 2 2831.0
The simulation result shows that 10W increase for HSPA carrier will get 10% gain of
throughput.
Description
The average output power for a GSM carrier is lower than the maximum output power due to
power control, DTX and GoS. Based on the multi-carrier technology and SDR technology, the
UMTS carrier can share the GSM TRX power of the same power amplifiers. This function
increases the utilization of the power amplifier as well as the HSPA service rate of the UMTS
cell.
In case of GSM service burst, the power shared by UMTS carrier can be callbacked in the
sharing period.
Time
Total Power
Time
Total Power
GU Dynamic Power sharing
Static Power Allocation
Power wasted
Allowed power for HSDPA
DPCH
BCCH power
GSM TCH power
BCCH power
UMTS HSPA power
GSM TCH power
No waste
Time
Total Power
Time
Total Power
GU Dynamic Power sharing
Static Power Allocation
Power wasted
Allowed power for HSDPA
DPCH
BCCH power
GSM TCH power
BCCH power
UMTS HSPA power
GSM TCH power
No waste
Urban scenario is preferred for GSM and UMTS power sharing; it is better that more GSM
service carriers are on the same one PA, more abundant power will be shared between GSM
and UMTS carriers; this also reduce the probability of GSM calling back shared power.
Enhancement
None
Dependency
None
Only MRRU and MRFU support it.
GU common PA

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This feature can’t be activated with WRFD-010684 2×2 MIMO or WRFD-010693 DL
64QAM+MIMO simultaneously
None
This feature has to be activated with MRFD-221801 Multi-mode Dynamic Power
Sharing(UMTS) simultaneously
6.2.2 MRFD-211802 GSM and UMTS Dynamic Spectrum
Sharing(GSM)
Availability
*This feature needs Huawei service to analysis the application scenario and enable it.
Summary
This feature enables dynamic sharing of spectrum resources between GSM and UMTS
networks based on the service loads. When the GSM service load is lower than a specified
threshold, some idle GSM spectrum resources can be allocated to UMTS. When the GSM
traffic load is higher than a specified threshold, these spectrum resources can be taken back
for use by GSM.
Benefits
UMTS has higher spectrum efficiency than GSM. Dynamic spectrum sharing between GSM
and UMTS helps to improve the network throughput and reduce the total cost of data services
without big impact on the busy GSM services and KPI. In theory, the maximum throughput
gain is about 50%. After this feature is introduced, the total cost of ownership (TCO) of
mobile broadband (MBB) can be reduced, and dynamic GSM/UMTS refarming can be
implemented. And more the result of DSS(Dynamic Spectrum Sharing) implementation can
guide operators to start static Refarming in the suitable time.
Description
If the peak hours of CS services and PS services are different in GSM and UMTS
co-existence networks, this feature enables UMTS to use idle GSM spectrum resources during
the off-peak hours of CS services, thus improving the UMTS network capacity. In the peak
hours of CS services, the shared GSM spectrum resources can be taken back for use by the
GSM network.
During network design, an operator can divide its GSM spectrum resources into three parts:
exclusive GSM frequencies, exclusive UMTS frequencies, and GSM/UMTS shared
frequencies. Normally, GSM/UMTS shared frequencies are used by GSM carriers. When the
GSM service load is low, the GU SDR RF module deactivates GSM carriers that use shared
GSM/UMTS frequencies, activates a UMTS carrier, and then allocates the shared
GSM/UMTS frequencies to the activated UMTS carrier.
For example, an operator has spectrum resources of a 10 MHz bandwidth. When the GSM
network is busy, the 10 MHz bandwidth is used by the GSM network. When the GSM

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network is idle, a 5 MHz bandwidth is sufficient for GSM services, and the remaining 5 MHz
bandwidth can be used by the UMTS network.
Only the GU SDR RF module supports this feature, applied for the scenario of GSM and
UMTS sharing the same MRFU/MRRU; The GSM and UMTS carriers can be manually
activated and deactivated when spcicified cell in specified time satisfies the condition judged
artificially by the historical traffic data. If condition is satified, the spectrum resources of
multiple continuous-coverage base stations can be dynamically allocated to GSM and UMTS
carriers, depending on the data configuration.
Enhancement
None
Dependency
Impacts on the BTS/NodeB/MBSC hardware
None
Impacts on the BTS/NodeB/MBTS hardware
Only 900M MRFU/MRRU supports this feature.
GSM and UMTS sharing the same MRFU/MRRU.
On the dynamic spectrum shared carrier, this feature can’t be activated with MRFD-211703
2.0MHz Central Frequency point separation between GSM and UMTS mode(GSM),
MRFD-221703 2.0MHz Central Frequency point separation between GSM and UMTS
mode(UMTS) simultaneously
This feature can’t be activated with GBFD-117001 Flex MAIO simultaneously
A specific M2000 V200R011 version that matches SRAN6.0 is required to support this
feature.
A common M2000 configuration is required.
P
e
a
k
h
o
u
r
O
f
f
-
p
e
a
k
h
o
u
r
GSM 5M UMTS 5M
GSM 5M
10M Frequency Bandwidth
Frequency allocation between GSM and UMTS
GSM 5M

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This feature has to be activated with MRFD-221802 GSM and UMTS Dynamic Spectrum
Sharing (UMTS) simultaneously
6.2.3 MRFD-211803 Dynamic MA for GU Dynamic Spectrum
Sharing(GSM)
Availability
Summary
With the DSS feature that was introduced in SRAN6.0, some idle GSM spectrum resources
can be allocated to UMTS only after the GSM service has a low volume of traffic that can be
carried on the BCCH carrier. This feature introduced in SRAN7.0 enables GSM to allocate its
spectrum to UMTS as long as GSM service traffic reduces to a volume that can be carried on
two or three TRXs. This prolongs the duration for which GSM spectrum resources can be
shared, furthermore, improves system throughput.
Benefits
This feature increases scenarios where GSM spectrum resources can be shared. It prolongs
spectrum sharing duration by twice to three times that provided by the DSS feature. It
therefore increases frequency spectrum usage.
Description
With the DSS feature that was introduced in SRAN6.0, some idle GSM spectrum resources
can be allocated to UMTS only after the GSM service has a low volume of traffic that can be
carried on the BCCH carrier. This feature introduced in SRAN7.0 enables GSM to allocate its
spectrum to UMTS as long as GSM service traffic reduces to a volume that can be carried on
two or three TRXs. This prolongs the duration for which GSM spectrum resources can be
shared.
When conditions for spectrum sharing are met, the BSC performs dynamic MA conversion
group by group. First, the BSC hands over UEs making calls on timeslots in the same group
to idle timeslots. Then, the BSC performs MA conversion on the vacant timeslots. The
frequency spectrum occupied by timeslots carried on basic carriers changes from the basic
one plus the shared one to the basic one. The frequency spectrum occupied by timeslots
carried on shared carriers changes from the basic one plus the shared one to the shared one.
After all timeslots have their occupied frequency spectrums converted, the BSC deactivates
the shared carriers. At last, the frequency spectrum occupied by GSM changes from the basic
one plus the shared one to the basic one.
After UMTS gives back the shared GSM spectrum resources, the BSC activates the shared
carriers and performs dynamic MA conversion group by group. First, the BSC hands over
UEs making calls on timeslots in the same group to idle timeslots. Then, the BSC performs
MA conversion on the vacant timeslots. At last, the frequency spectrum occupied by GSM
changes from the basic one to the basic one plus the shared one. The following figure
illustrates the first process:
Dynamic MA for GU DSS (GSM)

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Notes:
Basic carriers: The carriers left for GSM after dynamic MA conversion.
Shared carriers: The carriers left for UMTS sharing after dynamic MA conversion.
Enhancement
None
Dependency
Dependency on MBSC hardware
None
Dependency on MBTS hardware
None
Dependency on other features
This feature depends on the feature MRFD-211802 GSM and UMTS Dynamic Spectrum
Sharing (GSM) introduced in SRAN6.0.
This feature cannot be used together with MRFD-211703 2.0MHz Central Frequency point
separation between GSM and UMTS mode(GSM) and MRFD-221703 2.0MHz Central
Frequency point separation between GSM and UMTS mode(UMTS).
This feature cannot be used together with GBFD-117001 Flex MAIO.
The M2000 is of the V200R011 version.
A common M2000 configuration is required.
Dependency on other modes
The feature must be used together with the feature MRFD-221803 Dynamic MA for GU
Dynamic Spectrum Sharing (UMTS)

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6.2.4 MRFD-211804 GSM Power Control on Interference
Frequency for GU Small Frequency gap(GSM)
Availability
Summary
The interference of GSM to UMTS in the downlink is reduced by decreasing the transmit
power of the GSM frequency that is less than 2.6 MHz away from the UMTS central
frequency, improving HSDPA throughput. This feature is applicable only to scenarios where
UMTS services are deployed on a GSM frequency band using a non-standard bandwidth of
less than 5 MHz.
The following diagrams show GU refarming 3.8M and GU Refarming 4.2M scenes.
Benefits
This feature decreases the interference of GSM to UMT in the downlink, improving HSDPA
throughput. For GU3.8M bandwidth, during busy hour the average UMTS cell throughput
increases 5% and the maximum throughput increase 10%. For GU4.2M bandwidth, during
busy hour the average throughput of 64QAM user increase 1% and the maximum throughput
of 64QAM increases 3%, there is no gain for HSPA.
Description
GSM data is sent in bursts on each TCH by frequency hopping (FH). When the GSM data is
transmitted on a frequency that is less than 2.6 MHz away from the UMTS central frequency,
GSM proactively performs power compression on this frequency to decrease the interference
to UMTS in the downlink. To compensate the performance loss caused by power compression,
GSM performs power compensation on other frequencies. Power compression indicates
further power decrease after power control. Power compensation indicates further power
increase after power control.

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GSM compensates also the signal level to protect MSs at the edge of a cell from unnecessary
handovers.
Enhancement
None
Dependency
None
None
Dependency on other IP RAN features
MRFD-211703 2.0MHz Central Frequency point separation between GSM and UMTS mode
(GSM) or WRFD-021001 Flexible frequency bandwidth of UMTS
GBFD-113701 Frequency Hopping (RF hopping, baseband hopping)
None
MRFD-221804 GSM Power Control on Interference Frequency for GU Small Frequency gap
(UMTS)

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6.2.5 MRFD-211703 2.0MHz Central Frequency point separation
between GSM and UMTS mode(GSM)
Availability
1. GSM and UMTS 2.0MHz Central Frequency point separation
Summary
Huawei support Minimum 2.0MHz central frequency point separation between GSM and
UMTS with filter optimization and algorithm enhancement.
Benefits
This feature provides 3.8MHz frequency resource configuration for one carrier of UMTS, It
will increase the frequency utilization. Compared to 5MHz UMTS, this feature can save
1.2MHz bandwidth, this 1.2MHz bandwidth can be used for GSM and this will expand the
GSM network capacity or improve the GSM network performace.
The performance of UMTS3.8MHz network is as below:
The peak throughput in the best cell is that UMTS cell peak throughput with GSM and UMTS
2.6MHz Central Frequency point separation under 4*3 or higher frequency reuse
configuration.
Compared to GSM3.8MHz, UMTS 3.8MHz has higher gain; the gain of UMTS3.8MHz
compared to EDGE is as below: (GSM 3.8MHz with S333 configuration，EDGE peak
throughput is calculated by MCS9, EDGE average throughput is calculated by MCS6)

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Description
Currently, for mobile operators, ARPU of Voice service decreases continuously, but revenue
of data service increases very fast and becomes the main revenue increase resource.
According to radio wave propagation features, radio signals are transmitted farther at a lower
carrier frequency and allow one site to cover a wider area. This makes the UMTS850/900 an
excellent wide coverage solution. Therefore, investment for mobile networks goes down as
wider coverage per site means fewer sites. But frequency resource is scarce for operators,
especially for the low band 850/900MHz frequency. Most operators can’t spare full 5MHz
bandwidth from the limited low band, but due to fierce competition, these operators still hope
to deploy 3G network with none-standard bandwidth and frequency gap on 850/900MHz, for
example UMTS3.8MHz and 2.0MHz Central Frequency point separation between GSM and
UMTS.
Huawei make great efforts on the filter optimization and algorithm to provide the
UMTS3.8MHz refarming solution with 2.0MHz Central Frequency point separation when
GSM and UMTS are co-sitted, Compared to 5MHz UMTS, UMTS3.8MHz can save 1.2MHz
bandwidth, this 1.2MHz bandwidth can be used for GSM and this will expand the GSM
network capacity or improve the GSM network performace.
The motivation for smaller frequency separation between GSM and UMTS mode is:Lacking
of the frequency resources
This feature is only used for the below scenario:
1. Rural scenario: ISD≥3Km
2. GSM frequency: 7.4MHz and above(the continuous frequency >=5MHz)
3. GSM and UMTS co-site
4. No gain for HSPA+ of UMTS3.8MHz compared to 16QAM, The users with 64QAM in
U3.8M network only can reach 16QAM performance
Enhancement
None
Dependency
Impacts on the BSC/RNC/MBSC hardware
None
Impacts on the BTS/NodeB/MBTS hardware
UMTS:
900M MRRU
900M MRFU (excluding V1)
850M MRRU V2
GSM：
NULL

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GBFD-114801 Discontinuous Transmission (DTX) Downlink
GBFD-117601 HUAWEI III Power Control Algorithm
GBFD-117602 Active Power Control
It needs to purchase Huawei professional service additionally to minimize the KPI losses.
This feature has to be activated with MRFD-221703 2.0MHz Central Frequency point
separation between GSM and UMTS mode (UMTS) simultaneously
6.2.6 MRFD-211806 GSM and LTE Dynamic Power Sharing(GSM)
Availability
Summary
GSM and LTE carriers in an MBTS can share one power amplifier (PA). If the busy hours of
GSM and LTE carriers sharing one PA fall in different periods of a day or if traffic is not
evenly distributed between the GSM and LTE carriers, this feature allocates the unused power
of GSM carriers to LTE carriers during GSM off-peak hours to improve the service
performance of LTE CEUs. When GSM peak hours arrive or there is GSM burst traffic, GSM
reclaims the power to ensure its service quality.
Benefits
If each PA provides 5 W power and the LTE bandwidth is 20 MHz, simulation results are as
follows:
 In rural areas using the 850 MHz frequency band, this feature increases the throughput
for about 30% of LTE users and increases the throughput of CEUs by about 12%.
 In urban areas using the 1800 MHz frequency band, this feature increases the throughput
for about 45% of LTE users and increases the throughput of CEUs by about 15%.
However, this feature decreases the average throughput of LTE cells by less than 2%.
Description
According to field test results and simulation results, LTE CEUs experience low throughput.
Therefore, improving the performance of LTE CEUs is significant.
During GSM off-peak hours, the unused power of GSM carriers is allocated to LTE carriers,
and LTE carriers allocate the power to CEUs. This feature improves the performance of these
UEs by increasing the throughput of these UEs. However, it also decreases the average
throughput of LTE cells. The pilot power of LTE cells remains the same. When GSM busy
hours arrive or there is GSM burst traffic, the shared power is reclaimed to ensure GSM
service performance.

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Figure 6-1 GSM and LTE power sharing
This feature applies to scenarios where GSM and LTE carriers share one PA.
This feature requires the following configurations:
 LTE carriers must be configured with two transmit channels and two receive channels.
 Each GSM cell must be configured with at least three carriers, and each PA must be
configured with at least one non-BCCH GSM carrier.
Enhancement
None
Dependency
None
All GL dual-mode RF units with two transmissions, or
Two combined GL dual-mode RF units with one transmission
None
None
This feature has to be activated with MRFD-231806 GSM and LTE Dynamic Power Sharing
(LTE) simultaneously

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6.3 SingleSite
6.3.1 MRFD-211501 IP-Based Multi-mode Co-Transmission on BS
side(GBTS)
Availability
1. IP-based Dual-Mode Co-Transmission between BTS and NodeB
Summary
Huawei introduced the IP-based Dual-Mode Co-Transmission Between BTS and NodeB
function in SRAN3.0.
This function dynamically multiplexes BTS and NodeB data onto one transmission link,
saving transmission equipment and simplifying the transport network.
Benefits
This function provides the following benefits:
 Reduced investment in transmission equipment
 Fewer transmission resources required for the communication between the base station
and routers
 Simplified transport network
 Convenient network maintenance
Description
This function applies to the following sites:
 Sites where MBTSs are used
 Sites where BTSs and NodeBs share cabinets
This function dynamically multiplexes BTS and NodeB data onto one transmission link. With
different destination IP addresses, BTS and NodeB data can reach the BSC and RNC,
respectively. The following figure shows the working principle of this function.

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BTS and NodeB share Iub-interface transmission resources. The WMPT or UTRP provides a
port for multiplexing BTS and NodeB data. The port can be an E1/T1 port, FE electrical port,
FE optical port, GE electrical port, or GE optical port.
The following figure shows the implementation of co-transmission on the Iub interface. The
GTMU and WMPT are interconnected through FE ports. The GTMU sends BTS data to the
WMPT through the FE port. The WMPT then multiplexes BTS and NodeB data onto one
transmission link.
This function must be used with the MRFD-211502 IP-Based GSM and UMTS
Co-Transmission on MBSC Side feature to implement end-to-end co-transmission.
Enhancement
UMPT-based dual-mode co-transmission through backplane interconnection is supported in
SRAN7.0. The following figure shows the working principle of this technique. The GTMU
sends BTS data to the UMPT (U) through the BBU backplane. The UMPT (U) then sends
BTS and NodeB data to the transport network through a co-transmission port.

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From SRAN7.0, IP-based co-transmission through backplane interconnection is recommended.
Dependency
Dependency on BSC/RNC/MBSC hardware
None
Dependency on BTS/NodeB/MBTS hardware
 The GSM and UMTS sides of the base station must share the BBU.
 Different types of GE ports require different types of UTRP boards:
− GE electrical port: UTRP9
− GE optical port: UTRP2
 The UMPT must be configured in the enhancement of SRAN7.0 or SRAN8.0
 GBFD-118601 Abis over IP or GBFD-118611 Abis IP over E1/T1
 WRFD-050402 IP Transmission Introduction on Iub Interface
None
This function must be enabled together with the MRFD-221501 IP-Based Multi-mode
Co-Transmission on BS side (NodeB) feature.
2. IP-Based Dual-Mode Co-Transmission between GBTS and eNodeB
Summary
Huawei introduced the IP-based Dual-Mode Co-Transmission between BTS and eNodeB
function in SRAN5.0.

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This function dynamically multiplexes BTS and eNodeB data onto one transmission link,
saving transmission equipment and simplifying the transport network.
Benefits
and routers
Description
Huawei radio equipment supports the GSM/LTE co-transmission in IP mode on the MBTS
side. The dynamic multiplexing of the GSM and LTE data on the MBTS side saves the
transmission resources of the last mile between the MBTS and the router and simplies the
wireless transmission network. This feature is applicable to MBTS or GBTS、
eNodeB co-sited
scenarios.
The GSM and LTE data can be dynamically multiplexed onto the IP transport network. Based
on different destination IP addresses, the GSM and LTE services can be routed to the
corresponding BSC or MME/S-GW. The following figure shows the co-transmission
principles.
pTRAU
pTRAU
pTRAU
IP
GBSC
eNodeB
GBTS
MME/S-GW
Co-transmission
UDP
IP
/
PPP
IP
SW
Rou
ter
GTP-U
GTP-U
GTP-U
GTP-U
GTP-U
LTE
GSM
LTE
GSM
pTRAU
pTRAU
pTRAU
GTP-U
GTP-U
GTP-U
GTP-U
GTP-U
UDP
IP
/
PPP
IP
SW
Rou
ter
pTRAU Packetlized TRAU frame
pTRAU
pTRAU
pTRAU
IP
GBSC
eNodeB
GBTS
MME/S-GW
Co-transmission
UDP
IP
/
PPP
IP
SW
Rou
ter
GTP-U
GTP-U
GTP-U
GTP-U
GTP-U
LTE
GSM
LTE
GSM
LTE
GSM
LTE
GSM
pTRAU
pTRAU
pTRAU
GTP-U
GTP-U
GTP-U
GTP-U
GTP-U
UDP
IP
/
PPP
IP
SW
Rou
ter
pTRAU Packetlized TRAU frame
The GSM data and LTE data packed in the IP packets share the transmission resources on the
S1 interface. LMPT can provide the multiplex interface for GSM and LTE . The multiplex
interface could GE electrical or GE optical.
When the co-transmission is implemented on the S1 interface, the GSM data is switched to
the LTE transmission board through the FE port on the GSM transmission board. The LTE
transmission board multiplex the GSM data and LTE data and then transmits it on the shared
GE transmission bandwidth on the transmission link. The following figure shows the
co-transmission principles.

Page 24 of 46
This scheme implements the co-transmission in IP mode between the MBTS and the router.
Enhancement
Since SRAN7.0, dual-mode co-transmission based on UMPT is supported, GSM data is
converged to UMPT(UMTS) or LMPT board, and then GL co-transmission, please see the
below figure,
From SRAN7.0, IP-based co-transmission through backplane interconnection is recommended.
Dependency
None
GSM and LTE base station should share the BBU to support this feature
In SRAN7.0, UMPT or LMPT board is required.
GBFD-118601 Abis over IP
None

Page 25 of 46
This feature has to be activated with MRFD-231501 IP-Based Multi-mode Co-Transmission
on BS side(eNodeB) simultaneously
3. IP-based Triple-Mode Co-Transmission Among BTS, NodeB, and eNodeB
Summary
Huawei introduced the IP-based Triple-Mode Co-Transmission Among BTS, NodeB, and
eNodeB function in SRAN7.0.
This function dynamically multiplexes BTS, NodeB, and eNodeB data onto one transmission
link, saving transmission equipment and simplifying the transport network.
Benefits
and routers
Description
This function applies to MBTSs.
This function dynamically multiplexes BTS, NodeB, and eNodeB data onto one transmission
link. With different destination IP addresses, BTS, NodeB, and eNodeB data can reach the
BSC, RNC, and MME/S-GW, respectively. The following figure shows the working principle
of this function.
The UMPT or UTRPc provides a port for multiplexing BTS, NodeB, and eNodeB data. The
port can be an FE electrical port, FE optical port, GE electrical port, or GE optical port.
The following figure shows the implementation of triple-mode co-transmission on the
Abis/Iub/S1 interface. The GTMU sends BTS data to the UCIU through the BBU backplane.
The WMPT sends NodeB data to the UCIU, also through the BBU backplane. The UCIU then

Page 26 of 46
sends the data to the UMPT (L), which multiplexes the data of the three modes onto one
transmission link.
In the preceding figure, a UTRPc can be installed in BBU 1. If a UTRPc is installed in BBU 1,
the UCIU sends BTS and NodeB data to the UTRPc, and the UMPT (L) sends eNodeB data
to the UTRPc. Upon receiving all the data, the UTRPc multiplexes the data onto one
transmission link.
Enhancement
None
Dependency
None
Dependency on BTS/NodeB/eNodeB/MBTS hardware
The UMPT or UTRPc must be configured
 GBFD-118601 Abis over IP
 WRFD-050402 IP Transmission Introduction on Iub Interface
None
This feature must be used together with the feature MRFD-231501 IP-Based Multi-mode
Co-Transmission on BS side (eNodeB) and MRFD-221501 IP-Based Multi-mode
Co-Transmission on BS side (NodeB).

Page 27 of 46
6.3.2 MRFD-211504 TDM-Based Multi-mode Co-Transmission via
Backplane on BS side(GBTS)
Availability
1. TDM-Based GBTS and NodeB Co-Transmission via Backplane
Summary
Huawei radio equipment supports the GSM/UMTS co-transmission in TDM mode on the
MBTS side from SRAN3.0. The multiplexing of the GSM and UMTS data on the MBTS side
saves the transmission resources of the last mile between the MBTS and the transmission
equipment.
Benefits
This allows Operators to minimize their infrastructure costs, especially during the UMTS
deployment phase when the network load is low. The UMTS UTRAN and the GSM BSS
share the same physical medium and exchange User and Control information over this
medium. Compared with the traditional GSM and UMTS co-transmission solution, the
multi-mode BTS supports GSM and UMTS TDM data transmission sharing via backplane
without additional external E/T1 interface consumption.
Description
Huawei Multi-mode Base Station provides multiplexing traffic from GSM & WCDMA onto
same SDH network by time slots cross-connect function. RNC connect to NodeB by
fractional ATM function or fractional IP function. RNC/NodeB map ATM cells or IP packages
on several time slots of E1. The following figure shows the principle of the sharing.
TDM SW
time slot
time slot
time slot
time slot
time slot
time slot
time slot
time slot
time slot
time slot
time slot
time slot
SDH/PDH
time slot
time slot
time slot
time slot
TDM SW
time slot
time slot
time slot
time slot
time slot
time slot
time slot
time slot
GBSC
NodeB
GBTS
RNC
Co-transmission
time slot Idle timeslot time slot
time slot 3G traffic 2G traffic
TDM SW
TDM SW
time slot
time slot
time slot
time slot
time slot
time slot
time slot
time slot
time slot
time slot
time slot
time slot
SDH/PDH
time slot
time slot
time slot
time slot
TDM SW
time slot
time slot
time slot
time slot
time slot
time slot
time slot
time slot
GBSC
NodeB
GBTS
RNC
Co-transmission
time slot Idle timeslot time slot
time slot 3G traffic 2G traffic
TDM time slot can be shared by GSM and UMTS on the Abis interface or Iub interface. The
following figure shows that the sharing is based on the Iub interface. The UMTS data is
transferred on some of E1 time slots by Fractional ATM or Fractional IP，then the GSM data
is transferred on the remained E1 time slots. And UMTS equipments provide the time slots
cross-connect function.
错误！不能通过编辑域代码创建对象。
The following figure shows that the sharing is based on the Abis interface. Fractional ATM or
Fractional IP supports the ATM or IP signal of UMTS transferred through the gap of the TDM

Page 28 of 46
transport network of GSM. And GSM equipments provide the time slots cross-connect
function.
错误！不能通过编辑域代码创建对象。
Enhancement
None
Dependency
None
GSM and UMTS base station should share the BBU to support this feature
WRFD-050302 Fractional ATM Function on Iub Interface or
WRFD-050411 Fractional IP Function on Iub Interface
None
This feature has to be activated with MRFD-221504 TDM-Based Multi-mode
Co-Transmission via Backplane on BS side (NodeB) simultaneously
6.3.3 MRFD-211505 Bandwidth sharing of MBTS Multi-mode
Co-Transmission(GBTS)
Availability
The function Bandwidth Sharing of GBTS and eNodeB Co-Transmission is available from
SRAN7.0.
The function Bandwidth Sharing of GBTS, NodeB and eNodeB Co-Transmission is available
from SRAN8.0.
1. Bandwidth sharing of GBTS and NodeB Co-Transmission
Summary
This feature provides a transmission resource management solution for the scenarios that meet
the following requirements from SRAN5.0: MBTS with common transmission of IP over
FE/GE or IP over E1; separately configured RNC and BSC or unified configured MBSC.
Operators can configure a common transmission policy for GSM and UMTS services through
parameters such as the transmission priority, transmission bandwidth. In the case of
transmission resource congestion, this guarantees that GSM and UMTS high-priority services

Page 29 of 46
are processed continuously and this also ensures that the transmission resources are
dynamically shared for GSM and UMTS services.
For example, when a bottleneck bandwidth of MBTS is 4 Mbit/s, MBTS can check the
congestion status and then reduce the throughput for lower-priority services (such as HSDPA
services) to some extent to guarantee the continuity of high-priority services and dynamically
to share the bottleneck bandwidth of 4 Mbit/s.
Benefits
With separately configured RNC and BSC or unified configured MBSC, MBTS with common
transmission can ensure that GSM and UMTS can dynamically share all the transmission
resources with condition. In the case of transmission resource congestion in MBTS,
GSM/UMTS high-priority services will be guaranteed; when the demand for GSM services
decreases or even becomes unnecessary, the bandwidth is gradually occupied by UMTS
services, thus enabling smooth transmission evolution.
Description
There is a large margin for multiplexing transmission resources because peak load shifts
between GSM and UMTS services. In this situation, operators can employ GSM/UMTS
common transmission to save transmission resources and adopt the transmission resource
management algorithm to guarantee the continuity of high-priority services and avoid
possible mutual effect between GSM and UMTS services.
This feature is applicable to the scenarios that meet the following requirements: MBTS with
common transmission of IP over FE/GE or IP over E1; separately configured RNC and BSC
or unified configured MBSC.

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IP Network
FE/GE/
IP over E1
BSC
RNC
IP Network MBSC
MBTS
FE/GE/
IP over E1
FE/GE/
IP over E1
FE/GE/
IP over E1 FE/GE/
IP over E1
FE/GE/
IP over E1
MBTS
IP Network
MBSC
FE/GE/
IP over E1
FE/GE
FE/GE/
IP over E1
MBTS MME/SGW
This feature is applicable to the following scenarios:
1. Both the BSC/RNC or MBSC and the MBTS use FE/GE.
2. The BSC/RNC or MBSC uses FE/GE, while the MBTS uses IP over E1.
3. Both the BSC/RNC or MBSC and the MBTS use IP over E1.
4. The BSC/RNC or MBSC and the MBTS use IP over E1, the core networks use FE/GE.
The GSM and UMTS service priorities are configured centrally to indicate the priority of the
GSM services or UMTS services for occupying the transmission resources.
Operators can assign different priorities to GSM and UMTS services, for example, GSM
signaling, GSM voice service, GSM high-priority data service, GSM low-priority data service,
UMTS signaling, UMTS voice service, UMTS high-priority data service, and UMTS
low-priority data service. Services with different priorities correspond to different DSCP
values.
Transmission policies are devised in such a way that the priorities of different systems and
services are taken into consideration. If transmission congestion occurs at a node in the
transport network, this node preferentially forwards data packets for high-priority services
based on DSCP values. This ensures the QoS of high-priority services.
On detecting transmission resource congestion, the MBTS will automatically reduce the
bandwidth allocated to low-priority services based on the service priority policies, thus

Page 31 of 46
eliminating congestion. This ensures that the transmission bandwidth actually occupied by
GSM/UMTS services always approaches the bottleneck bandwidth.
Enhancement
None
Dependency
Impacts on the BSC/RNC hardware
NA
Impacts on the BTS hardware
NA
Dependency on other features of the GBSS
The feature depends on the following features:
MRFD-211501 IP-Based Multi-mode Co-Transmission on BS side（GBTS）
WRFD-050402 IP Transmission Introduction on Iub Interface
MRFD-221501 IP-Based Multi-mode Co-Transmission on BS side（NodeB）
None
This feature has to be activated with MRFD-221505 Bandwidth sharing of MBTS
Multi-mode Co-Transmission (NodeB) simultaneously
2. Bandwidth sharing of GBTS and eNodeB Co-Transmission
Summary
the following requirements: MBTS with common transmission of IP over FE/GE or IP over
E1.
Operators can configure a common transmission policy for GSM and LTE services through
parameters such as the transmission priority, transmission bandwidth. In the case of
transmission resource congestion, this guarantees that GSM and LTE high-priority services
are processed continuously and this also ensures that the transmission resources are
dynamically shared for GSM and LTE services.

Page 32 of 46
Benefits
With separately configured BSC or unified configured MBSC, MBTS with common
transmission can ensure that GSM and LTE can dynamically share all the transmission
GSM/LTE high-priority services will be guaranteed; when the demand for GSM services
decreases or even becomes unnecessary, the bandwidth is gradually occupied by LTE services,
thus enabling smooth transmission evolution.
Description
between GSM and LTE services. In this situation, operators can employ GSM/LTE common
transmission to save transmission resources and adopt the transmission resource management
algorithm to guarantee the continuity of high-priority services and avoid possible mutual
effect between GSM and LTE services.
common transmission of IP over FE/GE or IP over E1; separately configured RNC and BSC
or unified configured MBSC.
This feature is applicable to the following three scenarios:
The GSM and LTE service priorities are configured centrally to indicate the priority of the
GSM services or LTE services for occupying the transmission resources.
Operators can assign different priorities to GSM and LTE services, for example, GSM
LTE signaling, LTE voice service, LTE high-priority data service, and LTE low-priority data
service. Services with different priorities correspond to different DSCP values.
IP Network
FE/GE/
IP over E1
MME/SGW
BSC/RNC
MBTS
FE/GE/
IP over E1
FE/GE/
IP over E1

Page 33 of 46
GSM/LTE services always approaches the bottleneck bandwidth.
Enhancement
None
Dependency
NA
NA
MRFD-231501 IP-Based Multi-mode Co-Transmission on BS side（eNodeB）
None
This feature has to be activated with MRFD-231505 Bandwidth sharing of MBTS
Multi-mode Co-Transmission (eNodeB) simultaneously
3. Bandwidth sharing of GBTS, NodeB and eNodeB Co-Transmission
Summary
the following requirements: MBTS with common transmission of IP over FE/GE or IP over
E1.
Operators can configure a common transmission policy for GSM/UMTS/LTE services
through parameters such as the transmission priority, transmission bandwidth. In the case of
transmission resource congestion, this guarantees that GSM/UMTS/LTE high-priority
services are processed continuously and this also ensures that the transmission resources are
dynamically shared for GSM/UMTS/LTE services.
Benefits
With separately configured RNC/BSC or unified configured MBSC, MBTS with common
transmission can ensure that GSM/UMTS/LTE can dynamically share all the transmission

Page 34 of 46
GSM/UMTS/LTE high-priority services will be guaranteed; when the demand for GSM and
UMTS services decreases or even becomes unnecessary, the bandwidth is gradually occupied
by LTE services, thus enabling smooth transmission evolution.
Description
between GSM/UMTS/LTE services. In this situation, operators can employ GSM/UMTS/LTE
common transmission to save transmission resources and adopt the transmission resource
management algorithm to guarantee the continuity of high-priority services and avoid
possible mutual effect between GSM/UMTS/LTE services.
common transmission of IP over FE/GE or IP over E1.
This feature is applicable to the following three scenarios:
The GSM/UMTS/LTE service priorities are configured centrally to indicate the priority of the
GSM/UMTS/LTE services for occupying the transmission resources.
Operators can assign different priorities to GSM/UMTS/LTE services, for example, GSM
UMTS signaling, UMTS voice service, UMTS high-priority data service, UMTS low-priority
data service, LTE signaling, LTE voice service, LTE high-priority data service, and LTE
low-priority data service. Services with different priorities correspond to different DSCP
values.
GSM/UMTS/LTE services always approaches the bottleneck bandwidth.
IP Network
FE/GE/
IP over E1
MME/SGW
BSC/RNC
MBTS
FE/GE/
IP over E1
FE/GE/
IP over E1

Page 35 of 46
Enhancement
None
Dependency
NA
NA
MRFD-221501 IP-Based Multi-mode Co-Transmission on BS side（NodeB）
MRFD-231501 IP-Based Multi-mode Co-Transmission on BS side（eNodeB）
None
This feature has to be activated with the following features simultaneously
MRFD-221505 Bandwidth sharing of MBTS Multi-mode Co-Transmission (NodeB)
MRFD-231505 Bandwidth sharing of MBTS Multi-mode Co-Transmission (eNodeB)
6.3.4 MRFD-211601 Multi-mode BS Common Reference
Clock(GBTS)
Availability
1. GBTS and NodeB Common Reference Clock
Summary
Huawei Multi-mode Base Station provides common reference clock of GSM and UMTS
when GSM and UMTS co-BBU box from SRAN3.0. It can save the CAPEX and OPEX when
GSM and UMTS is deployed.

Page 36 of 46
Benefits
It is a cost-effective solution to provide common reference clock when the BTS works in
GSM and UMTS co-BBU solution.
Description
Huawei Multi-mode Base Station provides common reference clock of GSM and UMTS
when GSM and UMTS co-BBU box. Following cases is supported:
 Common GPS reference clock
For common GPS reference clock, only one set of external equipment is needed for GSM and
UMTS dual mode. And one set of external equipment is saved. Also one set of feeder and
antenna is needed, the installation cost and deployment cost is saved accordingly.
 Common BITS reference clock
For common BITS reference clock, only one set of external equipment is needed for GSM
and UMTS dual mode. And one set of external equipment is saved and the cost is saved
accordingly.
 Common E1/T1 reference clock from Abis interface
When GSM Abis interface is based on TDM of E1/T1, and UMTS Iub interface is based on IP
of FE/GE, WMPT can get the reference clock from the clock synchronized from the Abis
E1/T1 in GTMU. Clock server is not necessary to be configured for UMTS and the cost is
saved accordingly.
 Common E1/T1 reference clock from Iub interface
When GSM and UMTS BTS sharing the same transmission interface based on IP over E1/T1
or hybrid transmission based on IP, GTMU can get the reference clock from the clock
synchronized from the Iub E1/T1 in WMPT. Clock server is not necessary to be configured
and the cost is saved accordingly. Clock server is not necessary to be configured for GSM and
the cost is saved accordingly.
Enhancement
Huawei provides common reference clock of GSM and LTE with co-BBU box from
SRAN5.0
SRAN5.0 enhancement:
 Common Ethernet reference clock from Iub interface
When common Ethernet reference clock is used， GSM can get the clock via BBU
backplane from WMPT or UTRP.
 Common IP network 1588V2 reference clock from Iub interface
When GSM and UMTS BTS supporting 1588V2 reference clock, only one 1588V2 clock
server and client is required, GSM can get the clock via BBU backplane from WMPT or
UTRP.
Dependency

Page 37 of 46
None
Common BBU or BBUs inter-connected is required.
 Common GPS/BITS reference clock
BBU have to be configured with USCU（Universal satellite Card and Clock Unit） board
IP Clock Server have to be configured.
MRFD-210501 BTS/NodeB Clock
GBFD-510401 BTS GPS Synchronization
 Common Ethernet reference clock from Iub interface
GBFD-118202 Synchronous Ethernet
WRFD-050502 Synchronous Ethernet
GBFD-118620 Clock over IP Support 1588V2
WRFD-050501 Clock Sync on Ethernet in Node B
None
This feature has to be activated with MRFD-221601 Multi-mode BS Common Reference
Clock (NodeB) simultaneously
2. GBTS and eNodeB Common Reference Clock
Summary
Huawei Multi-mode Base Station provides common reference clock of GSM and LTE when
GSM and LTE co-BBU box from SRAN5.0. It can save the CAPEX and OPEX when GSM
and LTE is deployed.
Benefits
GSM and LTE co-BBU solution.

Page 38 of 46
Description
Huawei Multi-mode Base Station provides common reference clock of GSM and LTE when
GSM and LTE co-BBU box. Following cases is supported:
For common GPS reference clock, only one set of external equipment is needed for GSM and
LTE dual mode. And one set of external equipment is saved. Also one set of feeder and
antenna is needed, the installation cost and deployment cost is saved accordingly.
For common BITS reference clock, only one set of external equipment is needed for GSM
and LTE dual mode. And one set of external equipment is saved and the cost is saved
accordingly.
 Common E1/T1 reference clock from Abis interface
When GSM Abis interface is based on TDM of E1/T1, and LTE S1 interface is based on IP of
FE/GE, LMPT can get the reference clock from the clock synchronized from the Abis E1/T1
in GTMU. Clock server is not necessary to be configured for LTE and the cost is saved
accordingly.
 Common E1/T1 reference clock from S1 interface
When GSM and LTE BTS sharing the same transmission interface based on IP over E1/T1 or
hybrid transmission based on IP, GTMU can get the reference clock from the clock
synchronized from the S1 E1/T1 in UTRP for LTE mode. Clock server is not necessary to be
configured and the cost is saved accordingly. Clock server is not necessary to be configured
for GSM and the cost is saved accordingly.
 Common Ethernet reference clock from S1 interface
When common Ethernet reference clock is used，GSM can get the clock via BBU backplane
from LMPT or UTRP.
 Common IP network 1588V2 reference clock from S1 interface
When GSM and LTE BTS supporting 1588V2 reference clock, only one 1588V2 clock server
and client is required, GSM can get the clock via BBU backplane from LMPT.
Enhancement
None
Dependency
None
Common BBU or BBUs inter-connected is required.
BBU have to be configured with USCU（Universal satellite Card and Clock Unit） board

Page 39 of 46
IP Clock Server have to be configured.
LBFD-00300503 Synchronization with GPS
LBFD-00300504 Synchronization with BITS
LOFD-00301301 Synchronization with Ethernet(ITU-T G.8261)
LOFD-00301302 IEEE1588 V2 Clock Synchroniztion
None
Clock (eNodeB) simultaneously
3. GBTS, NodeB and eNodeB Common Reference Clock
Summary
Huawei Multi-mode Base Station provides common reference clock of GSM, UMTS and LTE
when GSM, UMTS and LTE under BBU inter-connected situation from SRAN7.0. It can save
the CAPEX and OPEX when GSM, UMTS and LTE is deployed in one site.
Benefits
GSM, UMTS and LTE BBU inter-connected solution.
Description
Huawei Multi-mode Base Station provides common reference clock of GSM, UMTS and LTE
when GSM, UMTS and LTE BBU inter-connected. Following cases is supported:

Page 40 of 46
For common GPS reference clock, only one set of external equipment is needed for GSM,
UMTS and LTE. One set of external equipment, one set of feeder and antenna are needed, the
installation cost and deployment cost is saved accordingly.
For common BITS reference clock, only one set of external equipment is needed for GSM,
UMTS and LTE. The cost is saved accordingly.
 Common E1/T1 reference clock from Abis/Iub interface
When Abis/Iub interface is based on TDM of E1/T1, and LTE S1 interface is based on IP of
GE, GSM/UMTS/LTE can get the reference clock from the clock synchronized from the
Abis/Iub E1/T1.
When common Ethernet reference clock is used，GSM and UMTS can get the clock via BBU
backplane from LTE UMPT.
When GSM, UMTS and LTE BTS supporting 1588V2 reference clock, only one 1588V2
clock server and client is required, GSM and UMTS can get the clock via BBU backplane
from LTE UMPT.
Enhancement
None
Dependency
NA
BBUs of GSM, UMTS and LTE base station shall be inter-connected.
A BBU have to be configured with USCU（Universal satellite Card and Clock Unit）
board
IP Clock Server has to be configured.
LBFD-00300503 Synchronization with GPS

Page 41 of 46
LBFD-00300504 Synchronization with BITS
WRFD-050502 Synchronous Ethernet
LOFD-00301301 Synchronization with Ethernet(ITU-T G.8261)
WRFD-050501 Clock Sync on Ethernet in Node B
LOFD-00301302 IEEE1588 V2 Clock Synchroniztion
NA
Clock (NodeB) and MRFD-231601 Multi-mode BS Common Reference Clock (eNodeB)
simultaneously
6.3.5 MRFD-211602 Multi-mode BS Common IPSec (GSM)
Availability
Summary
Internet Protocol Security (IPSec) tunnels are shared among GSM, UMTS, and LTE modes by
using an UMPT board. This ensures security of data transmission.
Benefits
 License fee is calculated based on the number of established IPSec tunnels. Therefore,
sharing IPSec tunnels helps reduce the operator's security cost.
 Sharing IPSec tunnels cuts the number of IP addresses required, reducing the complexity
of deploying security networks.
Description
IPSec ensures confidentiality, integrity, and usability of transmission. It provides a security
mechanism for base stations in all-IP transmission. IPSec provides security services for the IP
layer, and therefore the upper layers, including TCP, UDP, ICMP, and SCTP, can use the
security services.
IPSec is a protocol suite for securing IP communications. It provides high-quality,
interoperable, and cryptography-based security for IP packet transmission. Communication

Page 42 of 46
parties ensure the following security characteristics of data transmission on the network by
encrypting and authenticating IP packets:
 Confidentiality: User data is encrypted and transmitted in cipher text.
 Integrity: The received data is verified to check whether data has been tampered with.
 Authentication: Data is verified to confirm the sender of the data.
 Anti-replay: The main goal of anti-replay is to prevent malicious attackers from
repeatedly sending captured packets. The receiver will reject duplicate packets.
Internet Protocol Security (IPSec) tunnels are shared among GSM, UMTS, and LTE modes by
using an UMPT board. This ensures security of data transmission.
GSM
UMTS
LTE
UMPT IPsec Tunnel
Security Network
BSC/SGW/
MME/RNC
DMZ
CRL server
CA
RA
PKI
DHCP server
SeGW
Firewall
Firewall
MBTS
Apply for
OPKIcert
Enhancement
None
Dependency
None
UMPT or UTRPc
MRFD-221501 IP-Based Multi-mode Co-Transmission on BS side (NodeB)
One mode of multi-mode shall support IPSec feature (GBFD-113524 BTS Integrated IPsec，
WRFD-140209 NodeB Integrated IPSec，LOFD-003009 IPsec)
None
This feature must be used together with one of features MRFD-211602 Multi-mode BS
Common IPSec (GSM) and MRFD-231602 Multi-mode BS Common IPSec (LTE), or both.

Page 43 of 46
6.4 Power Consumption Saving
6.4.1 MRFD-211901 Multi-RAT Carrier Joint Intelligent
Shutdown (GBTS)
Availability
1. Cell Joint Shutdown in GU Scenarios
Summary
In an overlapping coverage area covered by co-sited GSM and UMTS base stations, UMTS
cells can be intelligently shut down or restarted based on traffic volume. During low-traffic
hours, UMTS cells are shut down and GSM cells provide services for all UEs in the area.
When the traffic volume on the GSM network increases, UMTS cells are restarted to handle
the increased traffic.
Benefits
By intelligently shutting down UMTS cells during low-traffic hours, this feature reduces the
overall power consumption of the GSM and UMTS networks. This converses energy, reduces
emissions, and reduces the operating expense (OPEX). The total amount of power saved by
this feature depends on factors such as the RF unit type and load distribution mode. For
example, this feature reduces the average power consumption of the UMTS network by about
6% to 10% a day under the following conditions:
 The load distribution mode is idle (8 hours)+medium load (12 hours)+high load (4
hours).
 UMTS cells are shut down for eight hours.
Description
When GSM and UMTS base stations are co-sited and cover the same area, the two base
stations can either use different RF units or share the same RF units but use different RF
channels. During low-traffic hours, UMTS cells are shut down by shutting down related
hardware modules to reduce power consumption. GSM cells provide services for all UEs in
the area. The RNC determines whether a UMTS cell should be shut down based on factors
such as the load of the UMTS cell, its co-coverage GSM cells, and user priorities. If a UMTS
cell meets shutdown conditions, the RNC hands over multimode UEs on the UMTS network
or reselects the UEs to the GSM network and then shuts down the UMTS cell. After UMTS
cells are shut down, GSM cells provide services for all UEs in the area. When the GSM
network load increases or the GSM network cannot meet the quality of service (QoS)
requirements of multimode UEs, the UMTS cell is restarted.

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This feature is recommended for either of the following scenarios:
 The penetration rate of UMTS data services is high, or traffic volumes are extremely
unbalanced at different times in a day. Examples include central business districts (CBDs)
and shopping malls.
 The penetration rate of UMTS data services is low. Examples include suburbs and rural
areas.
With the rapid development of mobile broadband networks, many users stay connected for 24
hours a day, downloading video, audio, and other types of files. The data service processing
of UMTS networks is superior to that in GSM networks. When a UMTS network is shut
down, the delay in downloading data will be prolonged due to a decreased download rate.
Differentiated services are therefore provided. When there is a high-priority user in a UMTS
cell, the UMTS cell is not shut down. If a high-priority user initiates services after the UMTS
cell is shut down, the UMTS cell is restarted in a timely manner to ensure quality service for
the high-priority user.
Enhancement
None
Dependency
The BSC, RNC, and MBSC must be purchased from Huawei to support the Iur-g interface
between the BSC and the RNC.
Dependency on BTS/NodeB/MBTS hardware
None
If there are multiple UMTS cells in an overlapping coverage area, this feature must be
enabled together with either of the following features:
WRFD-020117 Multi-Carrier Switch off Based on Traffic Load
WRFD-020122 Multi-Carrier Switch off Based on QoS
GSM
UMTS
GSM
UMTS
A UMTS cell is shut down when the traffic volumes on
the GSM and UMTS networks are both low.

Page 45 of 46
None
Dependency on UEs
UEs on the UMTS network must support GSM.
This feature must be enabled together with the MRFD-221901 Multi-RAT Carrier Joint
Intelligent Shutdown (NodeB) feature.
7 Acronyms and Abbreviations
Table 7-1 Acronyms and abbreviations:
Acronyms and
Abbreviations
Expansion
E Enhanced feature
M Maintenance (No change)
N New added feature
3G 3 rd Generation Mobile Communication System
3GPP 3rd Generation Partnership Project
AMR Adaptive Multi-Rate
Abis Abis Interface
BBU Baseband Control Unit
BSC Base Station Controller
CME Control Management Entity
CN Core Network
FE Fast Ethernet

Page 46 of 46
Acronyms and
Abbreviations
Expansion
GE Gigabit Ethernet
GERAN GSM/EDGE Radio Access Network
GSM Global System For Mobile Communication
HCS Hierarchical Cell Structure
LDR Load Reshuffling
LMPT LTE Main Processing Transmission unit
Iub Iub Interface
LTE Long Term Evolution
MIMO Multi-Input Multi-Output
NACC Network Assisted Cell Change
PHB Per-Hop-Behavior
QoS Quality of Service
RAB Radio Access Bearer
RAN Radio Access Network
RIM Radio Information Manager
RNC WCDMA Radio Network Controller
RRC Radio Resource Connection
SGSN Serving GPRS Support Node
SRAN Single Radio Access Network
TDM Time Division Multiple Access
UMTS Universal Mobile Telecommunications System
UE User Equipment
WCDMA Wideband CDMA
WMPT WCDMA Main Processing Transmission unit

SRAN8.0 GSM Multi-mode Feature Description.pdf

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