Technical Explanation For HUAWEI Dual-mode BTS Evolution
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HUAWEI TECHNOLOGIES CO., LTD.
Huawei Confidential
Contents
Dual-mode BTS Evolve Scenarios What We Need to Do for BTS Mode Evolution
GSM/UMTS Evolution G+U G+U G
Add hardware
G+U U
G+U G G
G+U
Add hardware
G
G+U G U U U
Move GTMU
U
Contents
Dual-mode BTS Evolve Scenarios What We Need to Do for BTS Mode Evolution
BTS - Smooth Evolution Co-Cabinet
SDR
Future version Evolution
GSM+UMTS 2G
3G
3G
2G
GSM
3G
GG G SSS MM M
UMTS
Different RF Co-Cabinet
MRFU
Add LTE card
in BBU
in BBU GSM + UMTS
BBU
GSM + UMTS+LTE
PWR
A N BBU3900
U U U G G G M M M S S S T T T M M M S S S
F
SDR: Software-defined radio
Co-Cabinet
Add UMTS card GSM
RRU3908
Different RF
U U U G G G M M M S S S T T T M M M S S S
LL L TTT EEE
Common platform of G/U/L for smooth migration Hardware sharing for GSM/UMTS/LTE by SDR to save the investment One MRRU/MRFU supports 6 GSM, or 4 UMTS carriers BBU shared by any RF
WBBP WBBP
GMPT WMPT
PWR
Typical configuration for GSM only RRU3908
RRU3908
GO F A N
RRU3908
GO
PWR
GTMU PWR
The GTMU includes the function of main control, transmission, clock and interfacing three CPRIs to three RRU3908.
GO
Appearance of the BBU3900
GTMU GSM Transmission & Timing & Management Unit for BBU Configuration quantity: 0 or 1, mandatory in GX mode. WMPT WCDMA Main Processing & Timing unit Configuration quantity: 0 to 2, mandatory in UX mode. WBBP WCDMA Baseband Processing unit Configuration quantity: 0 to 4, mandatory in UX mode.
Appearance of the RRU3908 Mode
Total Number of Carriers
Number of GSM Carriers of PA1
Number of UMTS Carriers of PA2
Power per Power per Power per GSM GSM UMTS Carrier Carrier Carrier (Power (Power (W) not Shared) Shared) (W) (W)
GxUy
2
1
1
20
20
40
3
2
1
15
15
30
4
3
1
10
12
30
3
1
2
20
20
20
4
2
2
10
10
20
5
3
2
10
12
15
GSM Only Evolve to GU Dual Mode RRU3908
GSM ONLY
RRU3908
Abis
GO F A N
RRU3908
GO
GO
PWR GTMU PWR
CPRI RRU3908
Abis + Iub
GSM&UMTS
GU F A N
RRU3908
GU
RRU3908
GU
PWR GTMU PWR WBBP
WMPT
CPRI
Hardware change: • WMPT and WBBP are needed to be added to meet the typical 2G/3G application. •
CPRI cables are necessary to connect between GTMU and WBBP.
Iub and Abis Transmission : Interface Iub can share the Abis transmission resource. When the primary Abis transmission resource is not enough, additional transmission resource can be added either on GTMU or WMPT.
GSM Only Evolve to GU Dual Mode Software change and configuration: •
The data of NodeB and relative logical target in RNC should be configured.
•
RRU’s work mode should be GSM&UMTS in NodeB.
•
The switch of SFP interface on GTMU should be configured consistent with hardware connection.
•
The work mode of RRU should be changed into GSM&UMTS in BSC maintenance terminal.
•
The UMTS software include WMPT,WBBP,RRU3908 should be downloaded and activated via NodeB maintenance terminal.
Influence: •
In the whole procedure, GTMU will not restart.
•
RRU3908 will restart automatically when the UMTS software of RRU has been activated. At this time, the GSM cell on the same RRU will be influenced until the RRU runs normally.
Change the Working Mode of MBSC
Networking Application Between the BBU3900 and RRU3908/MRFU
The networking modes between the BBU3900 and RRU3908/MRFU include the convergence connection on the CPRI panel and two-star connection. The MRFU supports only the two-star connection. For a new site, the two-star connection is first selected for the RRU3908. For the expansion and upgrade, the convergence connection on the CPRI panel can be selected as required.
Convergence connection on the CPRI panel RF module
RF module
RF module
GU
WBBP
BBU
UFA N
UPE U
WBBP WBBP
GTMU
WBBP
WMPT
CPRI Optical
If the RRU/RFU in GSM only or UMTS only mode is used, the CPRI interface can be from the GTMU or WBBP.
Two-star connection in GU mode R F U / R R U
R F U / R R U
R F U / R R U
WBBP
BBU
UFA N
UPE U
WBBP WBBP
GTMU
WBBP
WMPT
2G Data 3G Data
2G and 3G data can be transmitted on their own CPRI optical cables to implement decoupling. In this way, 2G and 3G equipment can coexist.
GU Dual Mode Evolve to UMTS Only RRU3908
RRU3908
RRU3908
Iub
GSM&UMTS F A N
PWR
GU Abis +
GU
GU
GTMU PWR WBBP
WMPT
RRU3908
UMTS only
RRU3908
RRU3908
Iub UO
F A N
UO
PWR PWR WBBP
WMPT
Hardware change: •
GTMU board must be removed while the whole site work in UMTS only mode. (This procedure will lead to all the service suspend of the site )
•
CPRI cables from GTMU to RRU and from WBBP to GTMU are not necessary without GTMU board.
•
CPRI cables are necessary to connect between RRU3908 and WBBP.
•
Transmission of interface Iub should be connected to WMPT .
UO
GU Dual Mode Evolve to UMTS Only Software change and configuration: •
The configuration of 2G BTS should be deleted.
•
The work mode of RRU should be changed into UMTS only in UMTS system.
•
The software version of BBU and RRU need not to be changed.
Influence: • • •
It will impact whole site 3G traffic In the whole procedure, WMPT and WBBP will not restart. RRU3908 will restart automatically when the CPRI cables is moved and GSM/UMTS cells service will be suspended until the RRU runs normally.
UMTS Only Evolve to GU Dual Mode RRU3908
RRU3908
RRU3908
Iub UO F A N
UO
UO
PWR PWR WBBP
WMPT
RRU3908
RRU3908
RRU3908
Iub
GSM&UMTS F A N
PWR
GU Abis +
GU
GU
GTMU PWR WBBP
WMPT
Hardware change:
•
GTMU is needed to be added to meet the 2G application.
• CPRI cables should be changed to connect between RRU and GTMU. (This procedure will lead to the service suspend of the site ) •
CPRI cables are necessary to connect between GTMU and WBBP.
•
Transmission of interface Abis should be added.
UMTS Only Evolve to GU Dual Mode Software change and configuration: •
The data of 2G BTS should be configured.
•
RRU’s work mode should be GSM&UMTS and SFP interface should be configured consistent with hardware connection.
•
The work mode of RRU should be changed into GSM&UMTS in NodeB maintenance terminal.
•
The GSM software of GTMU should be downloaded and activated via BSC maintenance terminal
Influence: •
It will impact whole site 3G traffic while hardware connecting.
•
In the whole procedure, WMPT and WBBP will not restart.
•
RRU3908 will restart automatically when the CPRI cables is moved and UMTS cells service will be suspended until the RRU runs normally.
GSM/UMTS Flexible Configuration RRU3908 GU Abis + Iub
RRU3908 GSM
A F A N
PWR
GTMU PWR WBBP
WMPT
Conditions: •
Whole site works in GSM&UMTS dual mode
•
Site must have one GSM cell at least.
•
RRU should connect to GTMU
•
Only change RRU work mode or capacity
No hardware change in dual mode flexible configuration change.
B
RRU3908 UMTS
C
GSM/UMTS Flexible Configuration Change of RRU mode (Not concern transmission resource and UMTS baseband capacity) Original Mode
Target Mode
Hardware
Software configuration
Software Version
GSM only
GSM&UMTS
No change
RRU mode and SFP change
Change to GU
GSM only
UMTS only
No change
RRU mode and SFP change
Change to UMTS
GSM&UMTS
GSM only
No change
RRU mode and SFP change
Change to GSM
GSM&UMTS
UMTS only
No change
RRU mode and SFP change
No change
UMTS only
GSM only
No change
RRU mode and SFP change
Change to GSM
UMTS only
GSM&UMTS
No change
RRU mode and SFP change
No Change
Influence: •
In the whole procedure, the boards in BBU will not restart.
•
RRU will restart when the work mode is changed and service on the RRU will suspend until the RRU runs normally.
IP sharing transmission
As shown in Figure 4-9, the dual-mode BTS can use the FE port (electrical port or optical port) or E1/T1 port. The 3G main control board provides routing functions for 2G traffic, and 2G traffic can be sent to the 3G transmission board through the interconnection between FE ports. In this way, the protocol termination and data distribution can be implemented. In addition, the 3G IP protocol stack should provide related router functions such as DHCP relay and ARP proxy for 2G traffic. Currently, the 3G version already supports the functions.
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HUAWEI TECHNOLOGIES CO., LTD.
Huawei Confidential
