Technical Description
Issue 12Copyright © Huawei Technologies Co., Ltd. 2012. All rights reserved.
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About This Document
Overview
This document provides information about 3900 series GSM base stations such as system principles, operation and maintenance, clock synchronization schemes, and surge protection specifications, aiming to enable operators to comprehensively understand functions of the 3900 series GSM base stations.
Product Version
The following table lists product versions involved in this document.
Product Name Product Version
BTS3900 GSM (BTS3900 for short) V100R013C00 BTS3900A GSM (BTS3900A for short) V100R013C00 BTS3900L GSM (BTS3900L for short) V100R013C00 DBS3900 GSM (DBS3900 for short) V100R013C00
Intended Audience
This document is intended for: l Network planners l Field engineers l System engineers
Organization
This section describes changes in the 3900 Series GSM Base Station Technical Description of each version.
2 Overview
3900 series base stations adopt the cutting-edge modular design for different modes and are managed by various systems. With simple components, they can be installed and deployed easily and fast. With comprehensive functions and remarkable performance, they can meet
requirements in various scenarios. In addition, they are diversified by flexibly combining functional modules and auxiliary devices.
3 BTS System Principle
The BTS consists of the BBU3900 (BBU for short), RF modules, and the antenna system. Its functional subsystem includes the control system, transport system, monitoring system, RF system, antenna system, and power supply system.
4 Control and Transport Systems
The functions of the control and transport systems are provided by the BBU. The control system manages the entire BTS system in a centralized manner, including signaling processing, operation and maintenance, and system clock. The transport system provides physical ports connecting the BTS and the transport network.
5 RF System
The functions of the RF system are provided by RF modules including the radio frequency units (RFUs) that are used in macro base stations and remote radio units (RRUs) that are used in distributed base stations. The RF system performs modulation, demodulation, data processing, and combination and division of RF and baseband signals.
6 Antenna System
The antenna system consists of antennas, feeders, jumpers, the Tower Mounted Amplifier (TMA), the Bias Tee (BT), and the GSM Antenna and TMA Control Module (GATM). It transmits and receives RF signals.
7 Operation and Maintenance
Operation and Maintenance (OM) covers management, monitoring, and maintenance of the software, hardware, and configuration of the BTSs. In addition, diversified OM modes are provided in various scenarios.
8 External Reference Clock Sources
The BTS supports multiple external reference clock sources, including the IP reference clock, E1/T1 reference clock, synchronous Ethernet reference clock, BITS reference clock, and GPS/ RGPS reference clock. If a BTS fails to obtain clock signals, it works in free-run mode for a certain period of time.
9 Surge Protection Specifications
This section provides surge protection specifications for the BBU, RF modules, and each type of base stations.
10 Technical Specifications
Conventions
Symbol Conventions
The symbols that may be found in this document are defined as follows.
Symbol Description
Indicates a hazard with a high level or medium level of risk which, if not avoided, could result in death or serious injury. Indicates a hazard with a low level of risk which, if not avoided, could result in minor or moderate injury. Indicates a potentially hazardous situation that, if not avoided, could result in equipment damage, data loss, performance deterioration, or unanticipated results. Indicates a tip that may help you solve a problem or save time.
Provides additional information to emphasize or supplement important points of the main text.
General Conventions
The general conventions that may be found in this document are defined as follows.
Convention Description
Times New Roman Normal paragraphs are in Times New Roman. Boldface Names of files, directories, folders, and users are in
boldface. For example, log in as user root.
Italic Book titles are in italics.
Courier New Examples of information displayed on the screen are in Courier New.
Command Conventions
The command conventions that may be found in this document are defined as follows.
Convention Description
Boldface The keywords of a command line are in boldface.
Italic Command arguments are in italics.
Convention Description
{ x | y | ... } Optional items are grouped in braces and separated by vertical bars. One item is selected.
[ x | y | ... ] Optional items are grouped in brackets and separated by vertical bars. One item is selected or no item is selected. { x | y | ... }* Optional items are grouped in braces and separated by
vertical bars. A minimum of one item or a maximum of all items can be selected.
[ x | y | ... ]* Optional items are grouped in brackets and separated by
vertical bars. Several items or no item can be selected.
GUI Conventions
The GUI conventions that may be found in this document are defined as follows.
Convention Description
Boldface Buttons, menus, parameters, tabs, window, and dialog titles are in boldface. For example, click OK.
> Multi-level menus are in boldface and separated by the ">" signs. For example, choose File > Create > Folder.
Keyboard Operations
The keyboard operations that may be found in this document are defined as follows.
Format Description
Key Press the key. For example, press Enter and press Tab. Key 1+Key 2 Press the keys concurrently. For example, pressing Ctrl+Alt
+A means the three keys should be pressed concurrently. Key 1, Key 2 Press the keys in turn. For example, pressing Alt, A means
the two keys should be pressed in turn.
Mouse Operations
The mouse operations that may be found in this document are defined as follows.
Action Description
Click Select and release the primary mouse button without moving the pointer.
Action Description
Double-click Press the primary mouse button twice continuously and quickly without moving the pointer.
Drag Press and hold the primary mouse button and move the pointer to a certain position.
Contents
About This Document...ii
1 Changes in the 3900 Series GSM Base Station Technical Description...1
2 Overview...8
3 BTS System Principle...13
4 Control and Transport Systems...15
4.1 Logical Structure of the BBU...16
4.2 BBU Transmission Ports...17
4.3 Transport Network Topologies...18
5 RF System...24
5.1 Logical Structure of the RRU...26
5.2 Logical Structure of the RFU...30
5.3 CPRI-Based Topologies...32
5.4 RRU3004 Configuration...36
5.5 Configurations of RRU3008, RRU3908, RRU3928, RRU3929, RRU3942, RRU3926, and the MRFUd ...42
5.6 DRFU Configuration...49
5.7 Configurations of the GRFU/MRFU/MRFUe...58
5.8 Hybrid Configuration of RF Modules...64
6 Antenna System...68
7 Operation and Maintenance...70
7.1 OM Modes of the BTS...71
7.2 OM Functions of the BTS...71
8 External Reference Clock Sources...74
9 Surge Protection Specifications...76
10 Technical Specifications...84
10.1 Technical Specifications for RFUs...85
10.1.1 DRFU Technical Specifications...85
10.1.2 GRFU Technical Specifications...88
10.1.4 Technical Specifications for MRFUd...108
10.1.5 Technical Specifications for MRFUe...122
10.2 Technical Specifications for RRUs...130
10.2.1 RRU3004 Technical Specifications...130
10.2.2 RRU3008 Technical Specifications...136
10.2.3 Technical Specifications for RRU3908...145
10.2.4 Technical Specifications for RRU3928...161
10.2.5 Technical Specifications for RRU3929...172
10.2.6 Technical Specifications for RRU3942...185
1
Changes in the 3900 Series GSM Base Station
Technical Description
This section describes changes in the 3900 Series GSM Base Station Technical Description of each version.12 (2012-12-30)
This is issue 12.
Compared with issue 11 (2012-10-20), this issue not include any new topics.
Compared with issue 11 (2012-10-20), this issue incorporates the following changes:
Topic Description
10.1 Technical Specifications for RFUs Added the maximum output power supported by the RF modules.
10.1.2 GRFU Technical Specifications Modified power consumption of the GRFU. 10.2 Technical Specifications for RRUs Added the maximum output power supported
by the RF modules.
Compared with issue 11 (2012-10-20), this issue does not exclude any topics.
11 (2012-10-20)
This is issue 11.
Compared with issue 10 (2012-09-27), this issue not include any new topics.
Compared with issue 10 (2012-09-27), this issue incorporates the following changes:
Topic Description
Topic Description
10.1 Technical Specifications for RFUs Modified the RET antenna support capability of each type of RFUs and specified whether each of them complies with AISG1.1. 10.2 Technical Specifications for RRUs Modified the RET antenna support capability
of each type of RRUs and specified whether each of them complies with AISG1.1.
Compared with issue 10 (2012-09-27), this issue does not exclude any topics.
10 (2012-09-27)
This is issue 10.
Compared with issue 09 (2012-06-30), this issue includes the following new topic: l 5.8 Hybrid Configuration of RF Modules
Compared with issue 09 (2012-06-30), this issue incorporates the following changes:
Topic Description
9 Surge Protection Specifications Added the surge protection specifications for the BTS3900(Ver.D), BTS3900L(Ver.D) and BTS3900A(Ver.D) cabinet.
5.7 Configurations of the GRFU/MRFU/ MRFUe
Removed MRFU V3 modules.
Compared with issue 09 (2012-06-30), this issue does not exclude any topics.
09 (2012-06-30)
This is issue 09.
Compared with issue 08 (2012-05-20), this issue not include any new topics.
Compared with issue 08 (2012-05-20), this issue incorporates the following changes:
Topic Description
5.5 Configurations of RRU3008, RRU3908, RRU3928, RRU3929, RRU3942, RRU3926, and the MRFUd
Modified the number of carriers supported by the RRU3908 V1.
4.3 Transport Network Topologies Added the networking with IP over E1/T1. 10.2 Technical Specifications for RRUs Modified the operating environment
Topic Description 10.1.5 Technical Specifications for
MRFUe
Added specifications when it operates in the 900 MHz frequency band.
Compared with issue 08 (2012-05-20), this issue does not exclude any topics.
08 (2012-05-20)
This is issue 08.
Compared with issue 07 (2012-03-30), this issue not include any new topics.
Compared with issue 07 (2012-03-30), this issue incorporates the following changes:
Topic Description
7.2 OM Functions of the BTS Added the note: The security of the USB loading port is ensured by encryption.
Compared with issue 07 (2012-03-30), this issue does not exclude any topics.
07 (2012-03-30)
This is issue 07.
Compared with issue 06 (2012-02-25), this issue includes the following new topic: l 10.2.7 Technical Specifications for RRU3926
Compared with issue 06 (2012-02-25), this issue incorporates the following changes:
Topic Description
5.5 Configurations of RRU3008, RRU3908, RRU3928, RRU3929, RRU3942, RRU3926, and the MRFUd
Added the Configurations on an RRU3926.
5.3 CPRI-Based Topologies Added the specifications of CPRI ports on an RRU3926.
Compared with issue 06 (2012-02-25), this issue does not exclude any topics.
06 (2012-02-25)
This is issue 06.
l 10.2.6 Technical Specifications for RRU3942
Compared with issue 05 (2011-11-30), this issue incorporates the following changes:
Topic Description
5.5 Configurations of RRU3008, RRU3908, RRU3928, RRU3929, RRU3942, RRU3926, and the MRFUd
Added the Configurations on an RRU3942.
5.3 CPRI-Based Topologies Added the specifications of CPRI ports on an RRU3942.
10.1.1 DRFU Technical Specifications Updated surge protection specifications. 10.1.2 GRFU Technical Specifications Updated surge protection specifications. 10.1.3 Technical Specifications for MRFU Updated RF specifications.
10.1.4 Technical Specifications for MRFUd
Updated RF specifications. 10.1.5 Technical Specifications for
MRFUe
Updated RF specifications.
10.2.1 RRU3004 Technical Specifications Added the standards with which an RRU3004 complies
10.2.2 RRU3008 Technical Specifications Added the standards with which an RRU3008 complies
10.2.3 Technical Specifications for RRU3908
Updated RF specifications. 10.2.4 Technical Specifications for
RRU3928
Updated RF specifications. 10.2.5 Technical Specifications for
RRU3929
Updated RF specifications.
Compared with issue 05 (2011-11-30), this issue does not exclude any topics.
05 (2011-11-30)
This is issue 05.
Compared with issue 04 (2011-09-30), this issue not include any new topics.
Compared with issue 04 (2011-09-30), this issue incorporates the following changes:
Topic Description
Compared with issue 04 (2011-09-30), this issue does not exclude any topics.
04 (2011-09-30)
This is issue 04.
Compared with issue 03 (2011-08-30), this issue includes the following new topic: l 10.1 Technical Specifications for RFUs
l 10.2 Technical Specifications for RRUs
Compared with issue 03 (2011-08-30), this issue incorporates the following changes:
Topic Description
9 Surge Protection Specifications Surge protection specifications for the ports on RF modules has been deleted.
Compared with issue 03 (2011-08-30), this issue does not exclude any topics.
03 (2011-08-30)
This is issue 03.
Compared with issue 02 (2011-06-25), this issue does not include any new topics. Compared with issue 02 (2011-06-25), this issue incorporates the following changes:
Topic Description
9 Surge Protection Specifications VER.B of the cabinet is added.
Compared with issue 02 (2011-06-25), this issue does not exclude any topics.
02 (2011-06-25)
This is issue 02.
Compared with issue 01 (2011-04-30), this issue includes the following new topic: l 5.5 Configurations of RRU3008, RRU3908, RRU3928, RRU3929, RRU3942,
RRU3926, and the MRFUd
l 5.7 Configurations of the GRFU/MRFU/MRFUe
Compared with issue 01 (2011-04-30), this issue incorporates the following changes:
Topic Description
5.1 Logical Structure of the RRU Information about the RRU3929 is added. 5.2 Logical Structure of the RFU Information about the MRFUe is added.
Topic Description
5.3 CPRI-Based Topologies Information about the RRU3929, MRFUe is added.
9 Surge Protection Specifications Surge protection specifications for the ports on the RRU3929, MRFUe are added.
Compared with issue 01 (2011-04-30), this issue excludes the following topic:
l Configurations of RRU3008, RRU3908, RRU3928, GRFU, MRFU, and the MRFUd
01 (2011-04-30)
This is issue 01.
Compared with issue 07 (2011-03-30) of V100R012, this issue includes the following new topics:
l 2 Overview
l 3 BTS System Principle l 4.2 BBU Transmission Ports l 5.2 Logical Structure of the RFU
l 5.7 Configurations of the GRFU/MRFU/MRFUe l 6 Antenna System
l 7 Operation and Maintenance
Compared with issue 07 (2011-03-30) of V100R012, this issue incorporates the following changes:
Topic Description
5.1 Logical Structure of the RRU Information about the RRU3908 and RRU3928 is added.
5.3 CPRI-Based Topologies Information about the MRFU, MRFUd,
RRU3908, and RRU3928 is added.
9 Surge Protection Specifications Surge protection specifications for the ports on the BTS3900 (Ver.C), BTS3900L (Ver.C), BTS3900A (Ver.C), MRFU, MRFUd, RRU3908, and RRU3928 are added.
Compared with issue 07 (2011-03-30) of V100R012, this issue excludes the following topics: l DBS3900 Product Family
l System Architecture of the BTS3900 l System Architecture of the BTS3900A
l System Architecture of the BTS3900L l Software Structure of the BTS
l Logical Structure of the BTS3900 l Logical Structure of the BTS3900L l Logical Structure of the BTS3900A l DBS3900 Monitoring Schemes l BTS3900 Monitoring System l BTS3900A Monitoring System l BTS3900L Monitoring System
l Signal Flow of the BTS3900/BTS3900A l Signal Flow of the BTS3900L
l Configuration of the BTS3900/BTS3900A l Configuration of the BTS3900L
l CPRI Cable Connections of the RRUs l RRU3008 Configuration
l Typical Scenarios of the DBS3900 (with the DC RRU) l Typical Scenarios of the DBS3900 (with the AC RRU)
2
Overview
3900 series base stations adopt the cutting-edge modular design for different modes and are managed by various systems. With simple components, they can be installed and deployed easily and fast. With comprehensive functions and remarkable performance, they can meetrequirements in various scenarios. In addition, they are diversified by flexibly combining functional modules and auxiliary devices.
BTS in the BSS
The base station subsystem (BSS) mainly consists of the base station controller (BSC) and the base transceiver station (BTS), as shown in Figure 2-1.
Figure 2-1 BSS architecture
BTS Types
There are four types of BTSs, that is, BTS3900, BTS3900A, BTS3900L, and DBS3900, meeting requirements in various scenarios, as shown in Table 2-1.
Table 2-1 BTS types Nam
e Type Usage Scenario InputPower CabinetCombination Reference BTS 3900 Indoo r macro base statio n Indoor installation scenarios where traffic load is heavy, lease cost of equipment room is high, or equipment room is space-limited. l -48 V DC l +24 V DC l 220 V AC l 110 V AC l Single cabinet l Double cabinets: Two cabinets are installed side by side or two cabinets are stacked. For information about usage scenarios and configurations of cabinets, see BTS3900(Ver.B) Hardware Description, BTS3900(Ver.C) Hardware Description and BTS3900(Ver.D) Hardware Description. BTS 3900 A Outdo or macro base statio n Outdoor installation scenarios where wide coverage is required such as cities, suburbs, or rural areas. l -48 V DC l 220 V AC l 110 V AC l TMC11H + RFC l APM30H + RFC (+IBBS + TMC11H) APM30H is a power cabinet, the RFC is a radio frequency cabinet, TMC11H is a transmission cabinet, and the IBBS is a battery cabinet. For information about usage scenarios and configurations of cabinets, see BTS3900A (Ver.B) Hardware Description, BTS3900A (Ver.C) Hardware Description and BTS3900A (Ver.D) Hardware Description.
Nam
e Type Usage Scenario InputPower CabinetCombination Reference BTS 3900 L Indoo r macro base statio n Indoor installation scenarios with large capacity where traffic load is heavy, lease cost of equipment room is high, or
equipment room is space-limited.
-48 V DC Single cabinet For information about usage scenarios and configurations of cabinets, see BTS3900L (Ver.B) Hardware Description, BTS3900L (Ver.C) Hardware Description and BTS3900L (Ver.D) Hardware Description.
Nam
e Type Usage Scenario InputPower CabinetCombination Reference DBS 3900 Distri buted base statio n Outdoor installation scenarios where site deployment is difficult and wide coverage is required. l -48 V DC l +24 V DC l 220 V AC l BBU + APM30H + RRU l BBU + TMC11H + RRU l BBU + 19-inch rack + RRU l Indoor wall-mounted BBU + RRU l BBU + OMB + RRU l BBU + ICR + RRU l BBU + IMB03 + RRU APM30H is a power cabinet, TMC11H is a transmission cabinet, the OMB is an outdoor mini box, the ICR is an indoor
centralized rack, and IMB03 is an indoor mini box. For information about usage scenarios and configurations of cabinets, see BBU3900 Hardware Description, APM30H&TMC 11H&IBBS200D &IBBS200T (Ver.B) Product Description, APM30H&TMC 11H&IBBS200D &IBBS200T (Ver.C) Product Description, APM30H&TMC 11H&IBBS200D &IBBS200T (Ver.D) Product Description and RRUxxxx Hardware Description. NOTE RRUxxxx refers to the model of each RRU.
3
BTS System Principle
The BTS consists of the BBU3900 (BBU for short), RF modules, and the antenna system. Its functional subsystem includes the control system, transport system, monitoring system, RF system, antenna system, and power supply system.Figure 3-1 shows the BTS system principle. Figure 3-1 BTS system principle
Functions of each system are as follows:
l Control system: Managing the entire BTS system in a centralized manner, including operation and maintenance, signaling processing, and system clock. For details, see section 4 Control and Transport Systems.
l Transport system: Providing physical ports connecting the BTS and the transport network and also provides maintenance channels connecting the BTS and the Operation and
Maintenance Center (OMC) to enable information exchange between the BTS and the transport network or OMC. For details, see section 4 Control and Transport Systems. l Monitoring system: Collecting external alarm information and reporting the information
to the control system. For details, see chapter Monitoring System in the Hardware
Description of the corresponding base station type.
l RF system: Processing RF and baseband signals. For details, see section 5 RF System. l Antenna system: Receiving uplink signals and transmitting downlink signals. For details,
see section 6 Antenna System.
l Power supply system: Obtaining power from external power supply devices and providing power for other subsystems of the BTS. For details, see chapter Power System in the
4
Control and Transport Systems
About This Chapter
The functions of the control and transport systems are provided by the BBU. The control system manages the entire BTS system in a centralized manner, including signaling processing, operation and maintenance, and system clock. The transport system provides physical ports connecting the BTS and the transport network.
4.1 Logical Structure of the BBU
The BBU consists of the main processing unit, BTS interface unit, high-speed interface unit, clock unit, and monitoring unit.
4.2 BBU Transmission Ports
The GTMU or UTRP board provides transmission ports to enable information exchange between the BTS and the transport network.
4.3 Transport Network Topologies
Transport network topologies include TDM, IP, and High level Data Link Control (HDLC) network topologies. In reality, these topologies are combined to save transmission device costs without deteriorating service quality.
4.1 Logical Structure of the BBU
The BBU consists of the main processing unit, BTS interface unit, high-speed interface unit, clock unit, and monitoring unit.
Figure 4-1 shows the logical structure of the BBU. Figure 4-1 Logical structure of the BBU
The control system consists of the main processing unit while the transport system consists of the BTS interface unit and high-speed interface unit.
Main Processing Unit
The main processing unit manages the entire BTS system in a centralized manner, including operation and maintenance, signaling processing, and system clock. It provides the following functions:
l Supports such protocols as UART, HDLC, and IP over FE.
l Controls the BTS interface unit to enable communication between the BBU and the BSC. l Controls the High-speed interface unit to enable communication between the BBU and RF
modules.
l Provides system clock for the BTS and obtains external clock signals.
BTS Interface Unit
The BTS interface unit enables information exchange between the BTS and the transport network by providing the following functions:
l Connects the BTS with the BSC.
l Synchronizes an upper-level clock with a lower-level clock.
High-Speed Interface Unit
The high-speed interface unit enables information exchange between the BBU and RF modules by providing the following functions:
l Receives the uplink baseband data from RF modules. l Transmits the downlink baseband data to RF modules.
Clock Unit
The clock unit provides the following functions:
l Provides system clock stemmed from high-precision clock sources for the BTS. l Checks the phase-locked status, provides phase lock for the software, adjusts DA, and
generates frame numbers.
Monitoring Unit
The monitoring unit collects external alarms and reports the alarms to the central processing unit.
4.2 BBU Transmission Ports
The GTMU or UTRP board provides transmission ports to enable information exchange between the BTS and the transport network.
Table 4-1 provides the specifications of transmission ports on the GTMU and UTRP boards. Table 4-1 Specifications of transmission ports on the GTMU and UTRP boards
Transmission
Mode Board Port Capacity
TDM over E1/T1 GTMU/GTMUb 1 4 ports
UTRPb4 1 4 ports
IP over E1/T1 GTMU/GTMUb 1 4 ports
Transmission over FE optical ports GTMU/GTMUb 1 10 Mbit/s or 100 Mbit/s Transmission over FE electrical ports GTMU/GTMUb 1 10 Mbit/s or 100 Mbit/s NOTE
The GTMU or GTMUb board is a mandatory board while the UTRPb4 board must be configured only when more than four E1s/T1s are required.
4.3 Transport Network Topologies
Transport network topologies include TDM, IP, and High level Data Link Control (HDLC) network topologies. In reality, these topologies are combined to save transmission device costs without deteriorating service quality.
TDM Network Topology
E1/T1 transmission is adopted for communication between the BTS and the BSC while TDM transmission is adopted on the Abis interface. TDM network topology includes such network topologies as chain, star, tree, and ring, as shown in Figure 4-2.
Figure 4-2 TDM network topology
Table 4-2 Usage scenarios and advantages of the four topologies
Topology Usage Scenario Advantage
Star A wild range of areas, especially densely populated areas
l Networking is simple. l Engineering is easy. l Maintenance is easy.
l Network capacity expansion is easy. l Transmission reliability is high. Chain Strip areas that are sparsely
populated such as areas along highways and railways
This topology helps reduce expenditure on transmission device, engineering, and leased transmission cables. Tree Areas where network
architecture, site distribution, and subscriber distribution are complicated such as an area where large-scale coverage overlaps with hot spot areas or small-scale coverage.
Compared with the star topology, this topology requires fewer transmission cables.
Ring A wild range of areas. Because of its self-healing capability, this topology is recommended when a route is available.
A ring topology can automatically split into two chains if transmission is disrupted at a breakpoint and base stations before and after the breakpoint can still function properly. This improves the system robustness. As shown in Figure 4-3, transmission is disrupted at B. Before disruption, BTSs 0, 1, and 2 are connected in a clockwise direction, forming a ring topology. After disruption, transmission is normal at BTS 0 and BTSs 1 and 2 form a chain topology with BTS 2 being the upper-level base station.
IP Network Topology
The Abis interface between the GBTS and BSC uses the IP over FE or IP over E1/T1 transmission mode. IP network topology includes IP over FE and IP over E1/T1 networking.
IP over FE network topology includes layer-2 and layer-3 networking, as shown in Figure 4-4.
Figure 4-4 IP over FE network topology
IP over E1/T1 network topology includes start, chain, and tree networking, as shown in Figure 4-5.
Figure 4-5 IP over E1/T1 network topology
HDLC Network Topology
E1/T1 transmission is adopted for communication between the BTS and the BSC while HDLC transmission is adopted on the Abis interface. HDLC network topology includes such network topologies as chain, star, and ring, as shown in Figure 4-6.
5
RF System
About This Chapter
The functions of the RF system are provided by RF modules including the radio frequency units (RFUs) that are used in macro base stations and remote radio units (RRUs) that are used in distributed base stations. The RF system performs modulation, demodulation, data processing, and combination and division of RF and baseband signals.
5.1 Logical Structure of the RRU
RRUs include RRU3004, RRU3008, RRU3908, RRU3928, RRU3929, RRU3942 and RRU3926.
5.2 Logical Structure of the RFU
The RFU includes the DRFU, GRFU, MRFU V1, MRFU V2, MRFUd and MRFUe.
5.3 CPRI-Based Topologies
Multiple CPRI-based topologies such as chain, star, and ring are supported for communication between BBUs and radio frequency (RF) modules.
5.4 RRU3004 Configuration
RRU3004 is a double-transceiver remote radio unit and supports two carriers. Different configurations must be chosen in different topologies.
5.5 Configurations of RRU3008, RRU3908, RRU3928, RRU3929, RRU3942, RRU3926, and the MRFUd
RRU3008, RRU3908, RRU3928, RRU3929, RRU3942, and RRU3926 are multi-carrier remote radio units. An RRU3908 V1 supports a maximum of six carriers. RRU3908 V2 and other modules support a maximum of eight carriers each. MRFUd is a multi-carrier radio frequency (RF) module and supports a maximum of eight carriers. RF configuration modes need to be selected depending on networking configurations.
5.6 DRFU Configuration
The DRFU is a double-transceiver module and supports two carriers. Different configurations must be chosen in different topologies.
5.7 Configurations of the GRFU/MRFU/MRFUe
The GRFU, MRFU V1, MRFU V2, and MRFUe are multi-carrier radio frequency (RF) modules. A GRFU or MRFU V1 or MRFU V2 supports six carriers, and an MRFUe supports eight carriers. Different configurations must be chosen in different topologies.
5.8 Hybrid Configuration of RF Modules
This chapter describes the cabinets supported by RFUs and RRUs and principles for hybrid configuration.
5.1 Logical Structure of the RRU
RRUs include RRU3004, RRU3008, RRU3908, RRU3928, RRU3929, RRU3942 and RRU3926.
RRU3004 consists of a high-speed interface unit, signal processing unit, power amplifier (PA), low noise amplifier (LNA), and dual duplexer. Figure 5-1 shows the logic structure of RRU3004. Figure 5-1 Logical structure of RRU3004
RXM_OUT: It is a main receive output port and is used for RRU interconnecting.
RXD_IN: It is a receive diversity input port and is used for RRU interconnecting.
RRU3008 consists of a main control and high-speed interface unit, signal processing unit, PA, LNA, RX, and dual duplexer. Figure 5-2 shows the logic structure of RRU3008.
Figure 5-2 Logical structure of RRU3008
RXM_OUT: It is a main receive output port and is used for RRU interconnecting.
RXD_IN: It is a receive diversity input port and is used for RRU interconnecting.
RRU3908, RRU3928, or RRU3929 consists of a high-speed interface unit, signal processing unit, PA, LNA, and duplexer. Figure 5-3 shows the logic structures of RRU3908, RRU3928, and RRU3929.
Figure 5-3 Logical structures of RRU3908, RRU3928, and RRU3929
RRU3942 consists of a high-speed interface unit, signal processing unit, PA, LNA, and duplexer. Figure 5-4 shows the logic structures of RRU3942.
Figure 5-4 Logical structures of RRU3942
RRU3926 consists of a high-speed interface unit, signal processing unit, PA, LNA, and duplexer. Figure 5-5 shows the logic structures of RRU3926.
Figure 5-5 Logical structures of RRU3926
High-Speed Interface Unit
l Receives data from an upper-level device, such as the BBU. l Sends data to an upper-level device, such as the BBU.
l Transfers data transmitted from cascaded RRUs by using CPRI ports.
Main Control and High-Speed Interface Unit
The main control and high-speed interface unit mainly provides the following functions: l Receives data from an upper-level device, such as the BBU.
l Sends data to an upper-level device, such as the BBU.
l Transfers data transmitted from cascaded RRUs by using CPRI ports. l Initializes RRU configurations and loads RRU software.
l Collects alarms and reports board status.
l Executes configuration commands sent from the BBU and manages configurations of an RRU's other units.
l Operates and maintains RRUs.
Signal Processing Unit
The signal processing unit consists of an uplink receive channel, a downlink transmit channel, and a control module. Moreover, it mainly processes radio frequency (RF) and GSM baseband signals.
An uplink receive channel mainly provides the following functions:
l Converts received signals into intermediate frequency analog signals by performing down-conversion.
l Converts intermediate frequency analog signals into digital signals by using an Analog Digit Converter (ADC).
l Processes intermediate frequency digital signals. l Matches filtering.
l Provides the Digital Automatic Gain Control (DAGC) function. l Packs data.
A downlink transmit channel mainly provides the following functions:
l Separates packed signals that are transmitted from the BBU including clock signals, control signals, and data signals. Then, transmits them to specified units.
l Combines and filters multiple routes of downlink signals.
l Converts digital signals into analog signals by using a Digit Analog Converter (DAC). Then, performs the Inphase and Quadrature (IQ) modulation.
l Converts RF signals into signals that can be transmitted in transmit frequency bands by performing up-conversion.
A control module mainly provides the following functions: l Initializes RRU configurations and loads RRU software. l Collects alarms and reports board status.
l Executes configuration commands sent from the BBU and manages configurations of an RRU's other units.
l Operates and maintains RRUs.
PA
A PA's major function is to amplify power of multi-carrier and low-power radio frequency (RF) signals that are sent from the signal processing unit.
LNA
The LNA performs low noise amplification on signals received by antennas.
RX
The RX's major function is to convert signals sent from the LNA into intermediate frequency analog signals by performing down-conversion. Then, it amplifies the intermediate frequency analog signals. Finally, it sends the signals to the ADC.
Duplexer
The duplexer and the dual duplexer mainly provide the following functions: l Filters transmitted or received signals.
l Multiplexes transmitted and received signals on RF channels. By doing this, signals are transmitted or received using the same antenna channel.
5.2 Logical Structure of the RFU
The RFU includes the DRFU, GRFU, MRFU V1, MRFU V2, MRFUd and MRFUe.
The RFU consists of a high-speed interface unit, signaling processing unit, power amplifier (PA), low noise amplifier (LNA), and duplexer. Figure 5-6 shows the logical structure of the DRFU. Figure 5-7 shows the logical structure of the MRFUd. Figure 5-8 shows the logical structures of the GRFU, MRFU V1, MRFU V2 and MRFUe.
Figure 5-7 Logical structure of the MRFUd
Figure 5-8 Logical structures of the GRFU, MRFU and MRFUe
High-Speed Interface Unit
The high-speed interface unit mainly provides the following functions: l Adapts signals sent from the BBU for the signaling processing unit. l Adapts signals sent from the signaling processing unit for the BBU.
Signal Processing Unit
The signaling processing unit consists of two uplink receive channels and one downlink transmit channel.
An uplink receive channel mainly provides the following functions:
l Converts received high frequency analog signals into intermediate frequency analog signals by performing down-conversion.
l Amplifies intermediate frequency analog signals and performs the Inphase and Quadrature (IQ) modulation.
l Converts analog signals into digital signals by using an Analog Digit Converter (ADC). l Samples digital signals.
l Matches filtering.
l Provides the Digital Automatic Gain Control (DAGC) function. l Seals frames.
A downlink transmit channel mainly provides the following functions:
l Processes signals that are transmitted from the BBU including clock signals, control signals, and data signals. Then, transmit them to specified units.
l Shapes and filters the downlink signals.
l Converts digital signals into analog signals by using a Digit Analog Converter (DAC). Then, performs the Inphase and Quadrature (IQ) modulation.
l Converts radio frequency (RF) signals into signals that can be transmitted in transmit frequency bands by performing up-conversion.
PA
The PA amplifies low-power RF signals that are sent from the signaling processing unit.
LNA
The LNA's major function is to perform low noise amplification on signals received by antennas.
Duplexer
The duplexer mainly provides the following functions:
l Multiplexes transmitted and received signals on RF channels.
l Enables signals to be transmitted or received using the same antenna channel. l Filters transmitted or received signals.
5.3 CPRI-Based Topologies
Multiple CPRI-based topologies such as chain, star, and ring are supported for communication between BBUs and radio frequency (RF) modules.
Topologies
Figure 5-9 shows CPRI-based topologies supported for communication between BBUs and RF modules. The DRFU, GRFU support the chain and star topologies. The RRU3004, RRU3008,
and RRU3926 support the chain, star, and ring topologies. The MRFU V1, MRFU V2, MRFUd, MRFUe, RRU3908, RRU3928, RRU3929, and RRU3942 support the star topology.
Figure 5-9 CPRI-based topologies
NOTE
RXU in the preceding figure indicates an RFU or RRU.
Table 5-1 Characteristics of the three topologies Topo
logy Advantage Disadvantage Remarks
Chain The transmission equipment cost is low.
l The number of cascading levels in a chain and the cascading distance are restricted. l Faults in an upper-level
RF module may affect lower-level RF modules. l This topology is applicable to scenarios where capacity is large. l RFUs and RRUs
cannot be cascaded.
Star l Installation and maintenance are easy. l Transmission
reliability is high. When an RF module or optical cable is faulty, only one sector is affected.
Compared with other topologies, this topology requires large numbers of optical cables.
This topology is applicable to scenarios where capacity is small.
Ring Transmission reliability is guaranteed.
l The number of cascading levels in a chain and the cascading distance are restricted. l Faults in an upper-level
RRU may affect lower-level RRUs.
l Only RRUs can be used in the ring topology.
l The ring topology is implemented by adding a redundant chain to a chain topology.
Based on the distance between a BBU and an RRU, CPRI networking is classified into short-distance remote networking and long-short-distance remote networking.
l For the short-distance remote networking, the longest distance between an RRU and a BBU on a CPRI chain does not exceed 100 m.
l For the long-distance remote networking, the longest distance between an RRU and a BBU on a CPRI chain ranges from 100 m to 40,000 m.
Different CPRI optical cables are used in the two types of networking. For details, see chapter CPRI Optical Cable in the BBU3900 Hardware Description.
CPRI Specifications
Table 5-2 lists the specifications of CPRI ports on the GSM Transmission, Timing, and Management Unit for BBU (GTMU).
Table 5-2 Specifications of CPRI ports on the GTMU board
Board Number
of CPRI Ports
Data Rate Topology Number of Supported TRXs
GTMU 6 1.25 Gbit/s Star, chain, or ring 36
GTMUb 6 1.25/2.5
Gbit/s
Star, chain, or ring 36
Table 5-3 lists the specifications of CPRI ports on different RF modules. Table 5-3 Specifications of CPRI ports on different RF modules
RF Module s Numb er of CPRI Ports
Data Rate Topology Number of Supported Carriers Cascadi ng Levels Maxi mum Dista nce from the BBU
DRFU 2 1.25 Gbit/s Star or chain 2 3 levels N/A
GRFU 2 l GRFU V1: 1.25 Gbit/s l GRFU V2: 1.25/2.5 Gbit/s
Star or chain 6 2 levels N/A
RRU300 4
2 1.25 Gbit/s Star, chain, or ring 2 6 levels 40 RRU300 8 2 l RRU300 8 V1 (850, or 1900 MHz): 1.25 Gbit/ s l RRU300 8 V1 (1800 MHz) or RRU300 8 V2: 1.25/2.5 Gbit/s Star, chain, or ring 8 6 levels 40
RF Module s Numb er of CPRI Ports
Data Rate Topology Number of Supported Carriers Cascadi ng Levels Maxi mum Dista nce from the BBU MRFU V1
2 1.25 Gbit/s Star 6 N/A N/A
MRFU V2
2 1.25/2.5 Gbit/s
Star 6 N/A N/A
MRFUd 2 1.25/2.5
Gbit/s
Star 8 N/A N/A
MRFUe 2 1.25/2.5
Gbit/s
Star 8 N/A N/A
RRU390 8 V1 2 l RRU390 8 V1 (850, 900, or 1900 MHz): 1.25 Gbit/ s l RRU390 8 V1 (1800 MHz): 1.25/2.5 Gbit/s Star 6 N/A 40 RRU390 8 V2 2 1.25/2.5 Gbit/s Star 8 N/A 40 RRU392 8 2 1.25/2.5 Gbit/s Star 8 N/A 40 RRU392 9 2 1.25/2.5 Gbit/s Star 8 N/A 40 RRU394 2 2 1.25/2.5 Gbit/s Star 8 N/A 40 RRU392 6 2 1.25/2.5 Gbit/s Star, chain, or ring 8 21 40
5.4 RRU3004 Configuration
RRU3004 is a double-transceiver remote radio unit and supports two carriers. Different configurations must be chosen in different topologies.
Port
Table 5-4 describes major ports on RRU3004. Table 5-4 Major ports on RRU3004
Type Silkscreen Description
Port for transceiving RF signals
ANT_TX/RXA and ANT_TX/RXB
The two ports, each of which is used to transmit and receive RF signals, connect to the antenna system through antenna channel 1 and antenna channel 2 respectively. CPRI port TX RX CPRI_W The port is a westbound optical/
electrical port and it is used to connect to the BBU or an upper-level RRU. TX RX CPRI_E The port is an eastbound optical/
electrical port and it is used to connect to a lower-level RRU.
Interconnection port for receiving RF signals
RX_IN/OUT The port is used to transmit and receive the diversity signals received through an antenna channel.
Basic Configurations
Table 5-5 lists the basic configurations of an RRU3004 serving only one sector.
The format of the description of the basic configuration is RF[F][TX][RX]_[C][TYPE]. Where, l F indicates the number of antenna channels for an RF module.
l TX indicates the number of transmit channels for an RF module. l RX indicates the number of receive channels for an RF module.
l C indicates the number of CPRI links connecting RF modules with the GTMU board. l TYPE indicates the CPRI network topologies applied to connect RF modules with the BBU.
If the value of TYPE is A, the star topology is applied. If the value of TYPE is B, the chain topology is applied.
Table 5-5 Basic configurations Basic
Configuration Number ofModules SendingReceiving Mode HardwareConfiguration
RF111_1A 1 Single feeder
[1TX 1RX]
Figure 5-10
RF211_1A 1 Double feeder
[1TX 1RX]
Basic
Configuration Number ofModules SendingReceiving Mode HardwareConfiguration
RF212_1A 1 Double feeder
[1TX 2RX]
Figure 5-12
RF222_1A 1 Double feeder
[2TX 2RX] Figure 5-13 RF112_2B 2 Single feeder [1TX 2RX] Figure 5-14
RF111_1A
An RRU3004 connects to the antenna system through ANT_TX/RXA. Antenna channel 1 transmits and receives signals. The star topology is applied to connect the BBU with the RRU3004.
Figure 5-10 RF111_1A
RF211_1A
An RRU3004 connects to the antenna system through ANT_TX/RXA and ANT_TX/RXB. Antenna channel 1 transmits signals while antenna channel 2 receives signals. The star topology is applied to connect the BBU with the RRU3004.
Figure 5-11 RF211_1A
RF212_1A
An RRU3004 connects to the antenna system through ANT_TX/RXA and ANT_TX/RXB. Antenna channel 1 transmits and receives signals while antenna channel 2 receives signals only. The star topology is applied to connect the BBU with the RRU3004.
RF222_1A
An RRU3004 connects to the antenna system through ANT_TX/RXA and ANT_TX/RXB. Both antenna channel 1 and antenna channel 2 transmit and receive signals. The star topology is applied to connect the BBU with the RRU3004.
Figure 5-13 RF222_1A
RF112_2B
Two RRU3004 connect to the antenna system through ANT_TX/RXA. Antenna channel 1 transmits and receives signals. RX_IN/OUT on the two RRU3004 interconnect to transfer diversity signals. The chain topology is applied to connect the BBU with one RRU3004.
Figure 5-14 RF112_2B
Typical Configurations
Table 5-6 describes the typical configurations of RRU3004 in different scenarios. Table 5-6 Typical configurations
Scenari
o Number ofModules Send Mode Typical Configuration
S1 1 Transmit diversity RF222_1A
Independent transmit l RF111_1A l RF212_1A l RF222_1A S2 1 Independent transmit or combination l RF111_1A l RF212_1A l RF222_1A 2 PBT RF112_2B S3 2 Independent transmit or combination RF112_2B S4 2 Independent transmit or combination l RF112_2B l RF111_1A + RF111_1A
5.5 Configurations of RRU3008, RRU3908, RRU3928,
RRU3929, RRU3942, RRU3926, and the MRFUd
RRU3008, RRU3908, RRU3928, RRU3929, RRU3942, and RRU3926 are multi-carrier remote radio units. An RRU3908 V1 supports a maximum of six carriers. RRU3908 V2 and other modules support a maximum of eight carriers each. MRFUd is a multi-carrier radio frequency (RF) module and supports a maximum of eight carriers. RF configuration modes need to be selected depending on networking configurations.
Port
Table 5-7 describes major ports on RRU3008 V1. Table 5-7 Major ports on RRU3008 V1
Type Silkscreen Description
RF port ANT-A and ANT-B The two ports, each of which is used to transmit and receive RF signals, connect to the antenna system through antenna channel 1 and antenna channel 2 respectively. CPRI port TX RX CPRI_W The port is a westbound optical/
electrical port and it is used to connect to the BBU or an upper-level RRU. TX RX CPRI_E The port is an eastbound optical/
electrical port and it is used to connect to a lower-level RRU.
Interconnection port for receiving RF signals
RX_IN/OUT The port is used to transmit and receive the diversity signals received through an antenna channel.
Table 5-8 describes major ports on RRU3008 V2 and RRU3908 V2. Table 5-8 Major ports on RRU3008 V2 and RRU3908 V2
Type Silkscreen Description
RF port ANT_TX/RXA and
ANT_TX/RXB
The two ports, each of which is used to transmit and receive RF signals, connect to the antenna system through antenna channel 1 and antenna channel 2 respectively. CPRI port CPRI0 The port is used to connect to the
Type Silkscreen Description
CPRI1 The port is used to connect to the BBU or a lower-level RRU. Interconnection port for
receiving RF signals
RX_IN/OUT The port is used to transmit and receive the diversity signals received through an antenna channel.
Table 5-9 describes major ports on RRU3908 V1. Table 5-9 Major ports on RRU3908 V1
Type Silkscreen Description
RF port ANT-A and ANT-B The two ports, each of which is used to transmit and receive RF signals, connect to the antenna system through antenna channel 1 and antenna channel 2 respectively. CPRI port TX RX CPRI_W The port is a westbound optical/
electrical port and it is used to connect to the BBU.
TX RX CPRI_E The port is an eastbound optical/ electrical port and it is used to connect to the BBU.
Interconnection port for receiving RF signals
RX_IN/OUT The port is used to transmit and receive the diversity signals received through an antenna channel.
Table 5-10 describes major ports on RRU3928 or RRU3929. Table 5-10 Major ports on RRU3928 or RRU3929
Type Silkscreen Description
RF port ANT_TX/RXA and
ANT_TX/RXB
The two ports, each of which is used to transmit and receive RF signals, connect to the antenna system through antenna channel 1 and antenna channel 2 respectively. CPRI port CPRI0 The port is optical/electrical port 0
and it is used to connect to the BBU. CPRI1 The port is optical/electrical port 1
Type Silkscreen Description Interconnection port for
receiving RF signals
RX_IN/OUT The port is used to transmit and receive the diversity signals received through an antenna channel.
Table 5-11 describes major ports on the MRFUd. Table 5-11 Major ports on the MRFUd
Type Silkscreen Description
RF port ANT_TX/RXA and
ANT_TX/RXB
The two ports, each of which is used to transmit and receive RF signals, connect to the antenna system through antenna channel 1 and antenna channel 2 respectively. CPRI port CPRI0 The port is used to connect to the
BBU.
CPRI1 The port is used to connect to the BBU.
Interconnection port for receiving RF signals
RX_INB The port is used to receive diversity signals from an antenna channel. RX_OUTA The port is used to transmit diversity
signals to an antenna channel.
Table 5-12 describes major ports on RRU3942. Table 5-12 Major ports on RRU3942
Type Silkscreen Description
RF port ANT_TX/RXA,
ANT_RXC, ANT_RXD, ANT_TX/RXB
The two ports, each of which is used to transmit and receive RF signals, connect to the antenna system through antenna channel 1 and antenna channel 2 respectively. CPRI port CPRI0 The port is optical/electrical port 0
and it is used to connect to the BBU. CPRI1 The port is optical/electrical port 1
and it is used to connect to the BBU. Interconnection port for
receiving RF signals
RX_IN/OUT The port is used to transmit and receive the diversity signals received through an antenna channel.
Table 5-13 describes major ports on RRU3926. Table 5-13 Major ports on RRU3926
Type Silkscreen Description
RF port ANT_TX/RXA,
ANT_RXB
The two ports, each of which is used to transmit and receive RF signals, connect to the antenna system through antenna channel 1 and antenna channel 2 respectively. CPRI port CPRI0 The port is optical/electrical port 0
and it is used to connect to the BBU. CPRI1 The port is optical/electrical port 1
and it is used to connect to the BBU. Interconnection port for
receiving RF signals
RX_IN/OUT The port is used to transmit and receive the diversity signals received through an antenna channel.
Basic Configurations
The basic configurations of RRU3008, RRU3908, RRU3928, RRU3929, RRU3942, RRU3926, and the MRFUd are the same. The following description takes RRU3008 V2 as an example. Table 5-14 lists the basic configurations of a single sector.
The basic configurations are described in the "RF[F][TX][RX]_[C][TYPE]" format. Where, l F indicates the number of antenna channels for an RF module.
l TX indicates the number of transmit channels for an RF module. l RX indicates the number of receive channels for an RF module.
l C indicates the number of CPRI links connecting RF modules with the GTMU board. l TYPE indicates the CPRI network topologies applied to connect RF modules with the BBU.
If the value of TYPE is A, the star topology is applied. If the value of TYPE is B, the chain topology is applied.
Table 5-14 Basic configurations Basic
Configuration Number ofModules SendingReceiving Mode HardwareConfiguration
RF111_1A 1 Single feeder
[1TX 1RX]
Figure 5-15
RF112_2B 2 Single feeder
[1TX 2RX]
Basic
Configuration Number ofModules SendingReceiving Mode HardwareConfiguration
RF211_1A 1 Double feeder
[1TX 1RX]
Figure 5-17
RF212_1A 1 Double feeder
[1TX 2RX]
Figure 5-18
RF222_1A 1 Double feeder
[2TX 2RX]
Figure 5-19
RF111_1A
An RRU3008 connects to the antenna system through ANT_TX/RXA. Antenna channel 1 transmits and receives signals. The star topology is applied to connect the BBU with the RRU3008.
Figure 5-15 RF111_1A
RF112_2B
Two RRU3008 connect to the antenna system through ANT_TX/RXA. Each antenna channel 1 transmits and receives signals. RX_IN/OUT on the two RRU3008 interconnect to transfer diversity signals. The chain topology is applied to connect the BBU with one RRU3008.
Figure 5-16 RF112_2B
RF211_1A
An RRU3008 connects to the antenna system through ANT_TX/RXA and ANT_TX/RXB. Antenna channel 1 transmits signals while antenna channel 2 receives signals. The star topology is applied to connect the BBU with the RRU3008.
RF212_1A
An RRU3008 connects to the antenna system through ANT_TX/RXA and ANT_TX/RXB. Antenna channel 1 transmits and receives signals while antenna channel 2 receives signals only. The star topology is applied to connect the BBU with the RRU3008.
Figure 5-18 RF212_1A
RF222_1A
An RRU3008 connects to the antenna system through ANT_TX/RXA and ANT_TX/RXB. Each antenna channel transmits and receives signals. The star topology is applied to connect the BBU with the RRU3008.
Figure 5-19 RF222_1A
Typical Configurations
Table 5-15 describes the typical configurations of RRU3008 in different scenarios. Table 5-15 Typical configurations
Scenario Number of
Modules Send Mode Typical Configuration
S3-S8 1 Independent transmit RF212_1A
Transmit diversity (S4) RF222_1A
S8-S12 2 Combined transmit RF112_2B
Independent transmit RF222_1A + RF222_1A
5.6 DRFU Configuration
The DRFU is a double-transceiver module and supports two carriers. Different configurations must be chosen in different topologies.
Port
Table 5-16 Major ports on the DRFU
Type Silkscreen Description
Port for transceiving RF signals
ANT1 and ANT2 The two ports, each of which is used to transmit and receive RF signals, connect to the antenna system through antenna channel 1 and antenna channel 2 respectively. CPRI port CPRI0 The port is used to connect to a
lower-level DRFU.
CPRI1 The port is used to connect to the BBU or an upper-level DRFU. Interconnection port for
receiving RF signals
RX1/IN and RX1/OUT RX1/IN is the diversity receive port for antenna channel 1 while RX1/ OUT is the diversity transmit port for antenna channel 1.
RX2/IN and RX2/OUT RX2/IN is the diversity receive port for antenna channel 2 while RX2/ OUT is the diversity transmit port for antenna channel 2.
Basic Configurations
Table 5-17 lists the basic configurations of a DRFU serving only one sector.
The format of the description of the basic configuration is RF[F][TX][RX]_[C][TYPE]. Where, l F indicates the number of antenna channels for an RF module.
l TX indicates the number of transmit channels for an RF module. l RX indicates the number of receive channels for an RF module.
l C indicates the number of CPRI links connecting RF modules with the GTMU board. l TYPE indicates the CPRI network topologies applied to connect RF modules with the BBU.
If the value of TYPE is A, the star topology is applied. If the value of TYPE is B, the chain topology is applied.
Table 5-17 Basic configurations Basic
Configuration Number ofModules SendingReceiving Mode HardwareConfiguration
RF111_1A 1 Single feeder
[1TX 1RX]
Figure 5-20
RF211_1A 1 Double feeder
[1TX 1RX]
Figure 5-21
RF212_1A 1 Double feeder
[1TX 2RX]
Basic
Configuration Number ofModules SendingReceiving Mode HardwareConfiguration
RF222_1A 1 Double feeder
[2TX 2RX]
Figure 5-23
RF112_2A 2 Single feeder
[1TX 2RX]
Figure 5-24
RF224_2A 2 Double feeder
[2TX 4RX]
Figure 5-25
RF111_1A
A DRFU connects to the antenna system through ANT1. Antenna channel 1 transmits and receives signals.
Figure 5-20 RF111_1A
RF211_1A
A DRFU connects to the antenna system through ANT1 and ANT2. Antenna channel 1 transmits signals while antenna channel 2 receives signals.
Figure 5-21 RF211_1A
RF212_1A
A DRFU connects to the antenna system through ANT1 and ANT2. Antenna channel 1 transmits and receives signals while antenna channel 2 receives signals only.
Figure 5-22 RF212_1A
RF222_1A
A DRFU connects to the antenna system through ANT1 and ANT2. Both antenna channel 1 and antenna channel 2 transmit and receive signals.
Figure 5-23 RF222_1A
RF112_2A
Two DRFUs connect to the antenna system through ANT1. Antenna channel 1 transmits and receives signals. RX1/IN on one DRFU interconnects with RX1/OUT on the other DRFU to transfer the diversity signals received through antenna channel 1.
Figure 5-24 RF112_2A
RF224_2A
Two DRFUs connect to the antenna system through their own ports ANT1 and ANT2. Both antenna channel 1 and antenna channel 2 transmit and receive signals. RX1/IN on one DRFU interconnects with RX1/OUT on the other DRFU to transfer the diversity signals received through antenna channel 1. RX2/IN on one DRFU interconnects with RX2/OUT on the other DRFU to transfer the diversity signals received through antenna channel 2.
Figure 5-25 RF224_2A
Typical Configurations
Table 5-18 describes the typical configurations of the DRFU in different scenarios. Table 5-18 Typical configurations
Scenario Number of
Modules Send Mode Typical Configuration
S1 1 Transmit diversity RF222_1A
Independent transmit or combination l RF111_1A l RF212_1A l RF222_1A S2 1 Independent transmit or combination l RF111_1A l RF212_1A l RF222_1A 2 PBT RF112_2A
Scenario Number of
Modules Send Mode Typical Configuration Transmit diversity l RF222_1A + RF222_1A
l RF224_2A (the receive mode is four-way receive diversity)
S3 2 Independent transmit or combination RF112_2A S4 2 Independent transmit or combination l RF112_2A l RF111_1A + RF111_1A l RF224_2A (the receive mode
is four-way receive diversity)
Two carriers of a DRFU can be shared by two cells. That is, a DRFU can serve two cells. Therefore, three DRFUs are used to achieve the configuration S3/3. Figure 5-26 shows the hardware configuration in the scenario where the configuration S3/3 is applied and Table 5-19 shows the corresponding data configuration.
Table 5-19 Data configurations in the configuration S3/3
DRFU Send Mode Sending Receiving Mode
DRFU0 Independent transmit or combination
Single feeder [1TX 2RX]
DRFU1 Double feeder [2TX 4RX]
DRFU2 Single feeder [1TX 2RX]
5.7 Configurations of the GRFU/MRFU/MRFUe
The GRFU, MRFU V1, MRFU V2, and MRFUe are multi-carrier radio frequency (RF) modules. A GRFU or MRFU V1 or MRFU V2 supports six carriers, and an MRFUe supports eight carriers. Different configurations must be chosen in different topologies.
Port
Table 5-20 describes major ports on the GRFU, MRFU V1, MRFU V2, and MRFUe. Table 5-20 Major ports on the GRFU, MRFU V1, MRFU V2, and MRFUe
Type Silkscreen Description
RF port ANT_TX/RXA The port, used to transmit and receive RF signals, connects to the antenna system through antenna channel 1. ANT_RXB The port, used to receive RF signals,
connects to the antenna system through antenna channel 2. CPRI port CPRI0 The port is used to connect to the
BBU or an upper-level RFU. CPRI1 The port is used to connect to the
BBU or a lower-level RFU. Interconnection port for
receiving RF signals
RX_INB and RX_OUTA RX_INB is the diversity receive port for an antenna channel while RX_OUTA is the diversity transmit port for the antenna channel.
Basic Configurations
The basic configurations of the GRFU, MRFU V1, MRFU V2, and MRFUe are the same. The following description takes the GRFU as an example. Table 5-21 lists the basic configurations of the GRFU serving a single sector.
The basic configurations are described in the "RF[F][TX][RX]_[C][TYPE]" format. Where, l F indicates the number of antenna channels for an RF module.
l TX indicates the number of transmit channels for an RF module. l RX indicates the number of receive channels for an RF module.
l C indicates the number of CPRI links connecting RF modules with the GTMU board. l TYPE indicates the CPRI network topologies applied to connect RF modules with the BBU.
If the value of TYPE is A, the star topology is applied. If the value of TYPE is B, the chain topology is applied.
Table 5-21 Basic configurations Basic
Configurations Number ofModules Send andReceive Mode HardwareConfiguration
RF111_1A 1 Single feeder
[1TX 1RX]
Figure 5-27
RF112_2A 2 Single feeder
[1TX 2RX]
Figure 5-28
RF211_1A 1 Double feeder
[1TX 1RX]
Figure 5-29
RF212_1A 1 Double feeder
[1TX 2RX]
Figure 5-30
RF111_1A
A GRFU connects to the antenna system through ANT_TX/RXA. Antenna channel 1 transmits and receives signals.
Figure 5-27 RF111_1A
RF112_2A
Two GRFUs connect to the antenna system through ANT_TX/RXA. Each antenna channel 1 transmits and receives signals. RX_INB on one GRFU interconnects with RX_OUTA on the other GRFU to transfer the diversity signals received through an antenna channel.
Figure 5-28 RF112_2A
RF211_1A
A GRFU connects to the antenna system through ANT_TX/RXA and ANT_RXB. Antenna channel 1 transmits signals while antenna channel 2 receives signals.
Figure 5-29 RF211_1A
RF212_1A
A GRFU connects to the antenna system through ANT_TX/RXA and ANT_RXB. Antenna channel 1 transmits and receives signals while antenna channel 2 receives signals only.
Figure 5-30 RF212_1A
Typical Configurations
Table 5-22 lists the typical configurations of the GRFU and MRFU in various scenarios. Table 5-23 lists the typical configurations of the MRFUe in various scenarios.
Table 5-22 Typical configurations of the GRFU and MRFU Scenario Number of
Modules Typical Configurations
S3-S6 1 RF212_1A
S7-S12 2 RF112_2A
S13-S18 3 RF112_2A + RF212_1A