multi radio basic

Slide 1For internal use
Flexi Multiradio BTS
For internal use
Contents
For internal use
For internal use
Introduction
Flexi Platform is a gateway to the future BTS development process
Common HW platform for different access technologies: GSM/EDGE, WCDMA, LTE
High flexibility supporting various BTS configurations
Flexible HW architecture allowing easy development towards the multiradio HW platform
BTS development path
For internal use
Introduction
The existing Flexi EDGE BTS is the baseline for Multiradio BTS solution:
Revolutionary approach to base station design
BTS built with self standing modules
BTS cabinet now just one of the installation options
New possibilities in site selection and build-out
Flexi EDGE BTS main elements
* © Nokia Siemens Networks Flexi Multiradio BTS/Network Engineering
For internal use
Introduction
The existing Flexi EDGE BTS is the baseline for Multiradio BTS solution:
All-purpose base station
Macro & micro coverage
For internal use
One all-purpose Base Station
For internal use
For internal use
Flexi Multiradio BTS is a common HW platform to be used for different access technologies: GSM/EDGE, WCDMA, LTE
Radio access functionality is shifted from dedicated HW to dedicated SW
Radio Modules (RFM/RRH) can transmit and receive multicarrier signals of multiple radio technologies concurrently
Each RM’s branch (pipe) can support several carriers (frequency blocks for WCDMA/LTE and virtual TRXs in case of GSM/EDGE) within the available RM’s bandwidth or the bandwidth can be shared between different technologies
Different technologies share the same RF Power amplifiers within one band
The output power of the RF power amplifiers is split between the RATs
Example: EDGE and WCDMA carriers in Concurrent Mode
Basic MR configuration: 3 HW units
For internal use
Up to 18 GSM TRX; 3 sector support; 3x 60W@antennaconnector
Flexible capacity increase from small to very large configurations
Up to 12 cells with 1-12 TRX/cell; Up to 36 TRX per BTS (BCF)
Up to 108TRX (36+36+36) in one sits using Multi BCF/common BCCH
Very High capacity sites possible without any cabinets
Antenna Optimized Configurations
Min GSM configuration
6/6/6, 2 modules
36/36/36, 9 modules
Max GSM configuration/BCF
For internal use
Existing Ultrasite BTS
RG10 ED** (Q2 2009)
Basic/Existing BR features
**RG10ED will have BTSPlus support@flexi BSC. Co siting comes in RG 20
ESMB
For internal use
BTS functionality for GSM/EGPRS
NodeB functionality for WCDMA
eNB functionality for LTE
System Module GSM/EGPRS
GSM/EGPRS
WCDMA
LTE
can be combined in a flexible way to configure a BTS for GSM/EGPRS, a NodeB for WCDMA, a eNB for LTE or a combination.
For internal use
For internal use
The installation options are compatible with the Flexi BTS
Complies with Flexi powering principles and compatible with Flexi power modules and
Compatible with Flexi antenna line
Flexi EDGE transmission plug in units can be used within Flexi Multiradio GSM/EDGE system module (ESMB/C).
Can be synchronized with the existing Flexi system modules.
Compatible with Flexi alarm extension module (FSEB)
The Flexi Multiradio RF Modules are not compatible with existing Flexi EDGE system module (ESMA)
The Flexi Multiradio GSM/EDGE system module (ESMB/C) is not compatible with Flexi EDGE DTRXs (EXxA) or RTCs (ECxA)
Compatibility
For internal use
For internal use
Flexi Multiradio BTS GSM/EDGE Architecture
Main functions of the modules
The System Module is the center of the system. It has all the external interfaces of the BTS (apart from the antenna interfaces). Main functions of the System Module are the Transport, BTS O&M, synchronization, power distribution and baseband processing functions. System Module interfaces support up to four Radio Modules with local power feed. Radio modules are connected to System Module through RP3-01 interfaces.
The Radio modules and RRH’s contain both RF BB and RF functions. They are multistandard and multicarrier transceivers. RF BB includes RP3-01 interface with multifunctional ASICs and controller. In addition of TX/RX lineups module has integrated front end. RFM front end will be implemented with SW tunable filters. RRH will have fixed full band filters.
For internal use
There are 2 variants of GSM/EDGE System Module: ESMB & ESMC
Note: Flexi EDGE BTS specific system module ESMA is not supported in Flexi Multiradio BTS
Main functions of the System Module:
GSM/EDGE BTS O&M
GSM/EDGE Configuration Management
Abis and transport
Power distribution
GSM/EDGE baseband
BTS synchronization
RP3-01 (OBSAI) interfaces and related multiplexing functions
ESMB / ESMC
For internal use
General Information
ESMB/ESMC has all the GSM/EDGE specific external and internal BTS interfaces (except the antenna interfaces)
48 VDC distribution, 4 radio outputs + 1 AUX output
Abis Interface,
External Alarm & Control Interface 12 inputs, 6 outputs and optional 12 input extension
4 pcs OBSAI RP3-1 Interfaces
BTS Reference Clock / Synchronization between BTSs
GSM frame clock input and output
GSM frame number input and output
2MHz synchronization input and output
1PPS input
For internal use
ESMB for smaller configurations up to 18 TRX
ESMC for bigger configurations up to 36 TRX
IP 65 protected
Temp range -35 to +55 degrees C
System Module is the centre of the system. Main Functions include:
BTS Operations and Maintenance
Optical OBSAI connectivity and related multiplexing/chaining functions
Power distribution to the RF modules
High capacity GSM baseband functionality for up to 18/36 TRX
BTS Synchronization
For internal use
Flexi Multiradio RF Module A (FXxA) - RFM
FXxA RFM variants (HW Rel 2.2) are WCDMA & LTE & GSM capable
RFM is optimized for 3 sector Macro BTS use (the module consists of 3 independent branches (pipes))
Each branch (pipe) can transmit and receive multicarrier signals of multiple radio technologies concurrently
Sector1 1÷6 carriers
DC Power supply input
For internal use
The transmitter and receiver chains and the front end
Software tunable filters
Integrated antenna line supervision and MHA support
OBSAI connectivity (optical 3 x RP3-1 interfaces)
RFM is a single band module
There are different RFM variants (FXxA) available to support different frequency band
MCPA – Multi Carrier Power Amplifier
LNA – Low Noise Amplifier
For internal use
General Information
RFM is a single band module. Separate FXxA modules for each frequency band are supported by Flexi Multiradio BTS
RF Module is able to work within the whole 3GPP band, however, its operational bandwidth in UL and DL is limited
The RF bandwidth is determined by two "blocks" in the RFM module:
SW Tuneable (STuFF) Front End Filter and
Digital PreDistortion (DAPD), which is used to improve the TX performance in the Multiradio capable BTS
The carriers supported by the pipe must stay within that RFM sub-band, however, sub-band window can be tuned to cover the desired frequencies from the 3GPP band
STuF and DAPD are automatically tuned by BTS SW, based on allocated carriers on each pipe
For internal use
Each RFM branch (pipe) can support several carriers (frequency blocks for WCDMA/LTE and virtual TRXs in case of GSM/EDGE) within the available RFM bandwidth or the bandwidth can be shared between different technologies
Note: The power amplifier (MCPA) amplifies simultaneously all the carriers defined within its bandwidth No antenna combiners are needed to combine the carriers to a common antenna line (therefore combining losses don’t need to be considered in the Link Budget calculations)
f1
5Mhz
f2
5Mhz
f3
5MHZ
f4
5Mhz
f1
f2
f3
f4
f6
f5
F1
X=1.4/3/5/10/15/20MHz
f2
f1
5Mhz
F
5Mhz
f1
f3
F1
f4
For internal use
General Information
Up to 6 carriers per RFM pipe can be defined for GSM/EDGE
Single RFM capacity is up to 18 carriers (TRXs), 6+6+6 TRXs
Carriers can be defined using 100 kHz frequency raster (minimum 400 kHz of the carrier separation in the pipe needs to be kept between GSM/EDGE carriers
Frequency, RFM variant
60W
60W
60W
60W
MCPA Concurrent mode(s): Max supported by HW: supported by HW: GSM/LTE GSM/WCDMA GSM/WCDMA/LTE WCDMA/LTE
5G+1U/1L(5MHz) 2G+2U/1L(10MHz) 1U+1L(10MHz)
5G+1U/1L(5MHz) 2G+3U 4G+2U/1L(10MHz) 2G+1U+1L(10MHz) 2U+1L(10MHz)
For internal use
Flexi Multiradio Remote Radio Head (FHxA) - RRH
RRH is optimized to support single sector with 2 RX and 2 TX diversity (2x2 MIMO)
RRH consists of two individual radio branches (pipes) designed to transmit and receive multicarrier signals of multiple radio technologies
Each pipe supports 1 x TX and 1 x RX chain
RRH is equipped with:
2 RP3 01 OBSAI Interfaces, for System Module connectivity and RRH Chaining
2 TX/RX Antenna Interfaces
Integrated Duplex Filters
For internal use
Flexi Multiradio Remote Radio Head (FHxA) – RRH
Single RRH capacity is up to 12 carriers (TRXs), 40+40W (6+6 TRXs)
New Flexi Multiradio Modules
(**) - The capacities shown here are per MCPA or per branch. RRH has 2 MCPA branches. So the total RRH HW capacity is twice the MCPA Concurrent Mode as shown here
Frequency, RRH variant
1.4/3/5/10/15/20 MIMO
1.4/3/5/10/15/20 MIMO
2 RAT mode for RRH unit (Dedicated or Concurrent mode for MCPA)
GSM and/or WCDMA and/or LTE
GSM and/or WCDMA and/or LTE
Output power
MCPA Concurrent mode(s)** Max supported by HW: GSM/LTE, GSM/WCDMA GSM/WCDMA/LTE WCDMA/LTE
For internal use
There are different working modes of Flexi Multiradio BTS
Dedicated Mode each technology has its own Radio Resources connected to the System Module
Concurrent Mode Radio Resources (e.g. RFM) are shared between technologies (different RAT in the same frequency band)
Dedicated RFM each Flexi System Module has its own RFM connected
RFM is shared each Flexi System Module has its own RP3-1 connections to shared RFM
1
2
For internal use
RF configurations
Dedicated SW features need to be used to enable RFM sharing between different technologies
RG10EP5.1 / RU20EP1(complete support in RU30) : RF sharing WCDMA – GSM (RAN1770)
RG25 / RL20: RF sharing 2G – LTE (BSS21520 & LTE447)
RU30 / RL30: RF sharing WCDMA – LTE (RAN2126 & LTE435)
Allowed combinations of multi-technology carriers and the number of supported shared / dedicated Radio Modules is strictly defined by the features
Concurrent Mode
Flexi Multimode System Module FSMD/FSME (HW Rel 2) needs to be used for WCDMA/LTE to support Radio Resource sharing in the concurrent mode
ESMB/ESMC System Module is required to support GSM/EDGE
PWR
PWR
PWR
PWR
3 HU
Transmission sub-module
3x 100 & 1000 BaseT Ethernet
External synchronization input and output
For internal use
RF configurations
Flexi MR BTS is seen as two separate logical network elements with common Radio Resources
Concurrent Mode
RFM and antenna lines are shared
In the concurrent mode both system modules must be synchronized together
Each module has its own power supply
Both system modules can feed the power to the RFM
Each radio technology has dedicated logical backhaul connections (Abis, Iub and S) to radio controllers and servers (from each logical network element)
*) on top feature
For internal use
Several modules can be connected to ESMB/ESMC in order to:
Increase capacity above 6+6+6 TRXs
Maximize coverage (increase output power per carrier through spreading them over more than one RFM pipe) or support coverage boosters
Support operator's bandwidth in case it exceeds RFM’s bandwidth
Maximum 4 RFMs can be connected
Amount of RP3-1 interfaces available in the system module limits the number of connected RFMs
Basic 3-sectorized configuration
*) on top feature
For internal use
Baseband processing capacity centralized in ESMB/ESMC supports:
Up to 6 cells (up to 12 cells in MOBSS case)
Up to 16 carriers per sector
Up to 36 carriers (12+12+12) per BTS (1 BCF)
ESMB - up to 18 carriers (TRXs) capacity
ESMC - up to 36 carriers (TRXs) capacity
Capacity above 6+6+6 can be achieved by installing additional RFM modules per BTS configuration
More than one RFM branch (pipe) can be used in a cell
RFM branches (pipes) used in the same cell can be from the same or different RF module(s)
GSM/EDGE dedicated mode
3-sectorized BTS site
Up to 12+12+12 (one sector shown)
2RX div applied with shared diversity paths between the branches (both RMs tuned to the same sub-band)
Slide 40; Excel database; BTS conf.: 7÷9, 28÷31
For internal use
Higher capacity can be supported by the multi ESMB/ESMC configuration
Up to 108 TRXs (36+36+36)
Multi BCF/common BCCH feature is mandatory
Max configuration (one sector shown):
Up to 36+36+36
6 RFM, 3 ESMC, MultiBCF
3 Xpol / sector
9 Xpol / site
RFMs simultaneously connected to ESMB/ESMC can be of different frequency band, e.g.:
900 MHz 6+6+6 & 1800 MHz 6+6+6 or
900 MHz 12+12+12
1800 MHz 12+12+12
*) on top feature
For internal use
Maximize coverage (increase output power per carrier) or support coverage boosters
TX transmit power is shared between carriers
More carriers configured per RFM branch (pipe) means lower output power per carrier
Several RFM branches (pipes) can be used per sector to distribute carriers and increase output power per carrier
Support operator's bandwidth in case it exceeds RFM’s bandwidth
More than one RFM per sector might be required when the Operator’s bandwidth (defined ARFCNs) exceeds one RFM RF branch bandwidth
Note: It should be always verified whether the gain coming from higher output power is not consumed by increased BTS costs (RFM costs are a significant part of the total BTS cost)
Up to 12+12+12
2RX div RFMs tuned to different frequency sub-bands (one sector shown)
Slide 40; Excel database; BTS conf.: 19÷21, 34 ÷ 36
Maximized output power (one sector shown):
Up to 12+12+12 (2RX div shared between branches)
4 TRXs * 60W
8 TRXs * 30W
12 TRXs * 20W
For internal use
RF configurations
More than one RFM pipe per sector might require several antennas installed on site
Multi Radio Combiner (MRC) can be used to combine pipes to single antenna line
Up to 12+12+12
Each pipe has its own antenna connected
Note: MRC introduces additional losses in DL & UL
For internal use
RF configurations
The main criteria to be considered when deciding on the configuration are:
No of carriers per sector
No of carriers determines the minimum number of RFM modules per BTS site and whether ESMB or ESMC has to be used
No of RFM branches (pipes) per sector
No of RFM branches determines the maximum output power per carrier
Carriers can be spread over several RFM modules less carriers per single RFM means higher output power
More than one RFM per sector might be required when the Operator’s bandwidth (defined ARFCNs) exceeds one RFM RF branch bandwidth
Coverage booster
For internal use
RF configurations
For the sake of simplicity the Typical BTS configuration list is limited to the configurations satisfying the following assumptions:
3-sectorized BTS site considered only
Symmetrical BTS configurations considered only (e.g. 1+1+1, 2+2+2, etc.)
Symmetrical antenna configurations within one sector and site
2 Xpol antennas and 12 carriers per sector are the maximum
All the configurations grouped as follows:
Standard configuration (Slide 41; Excel database; BTS conf.: 1÷27)
Minimum no of RFM modules used at a cost of reduced output power per carrier
Maximized output power (Slide 41; Excel database; BTS conf.: 28÷39)
Carriers span over several RFM modules
Maximized output power at a cost of higher number of RFM modules used
For internal use
Resource allocation algorithm
Power Budget: Maximum total TX output power on one pipe is 60 W which can be shared between the TRX objects allocated on that pipe:
1 TRX = 60 W per TRX
1..2 TRXs = 30 W per TRX
….
1..6 TRXs = 10 W per TRX
Frequency Budget: All BTS TX (DL) frequencies allocated on one pipe must be within 20 MHz window:
Example: 3 TRXs per BTS:
TRX-1 @ ARFN 1 = 935.2 MHz (BTS TX frequency)
TRX-2 @ ARFN 50 = 945.0 MHz
TRX-3 @ AFRN 100 = 955.0 MHz
All channels within 20 MHz = OK!
Extended Uplink on 1800 MHz: If two pipes are used for the same local sector, then BTS RX (UL) frequencies on that sector can be up to 30 MHz
If either Power or Frequency budget is exceeded, alarm is raised:
7606 – TRX FAULTY – “TRX object allocation failed in RF Module”
For internal use
For internal use
Flexi MR BTS - TX output power
The nominal output power at the antenna connector is equal to:
60 W for the 3-sector RFM (60W per branch (pipe))
40 W for single sector RRH (40W per branch (pipe))
The nominal output power at each branch (pipe) is the maximum cumulated sum of output powers of all the carriers (TRXs) within that branch
The output power per carrier of a radio branch decreases with the increasing number of carriers in the radio branch
In the concurrent mode the total output power of RFM/RRH is shared between radio technologies:
GSM / LTE 40W / 20W or GSM / LTE 20W / 40W
GSM / WCDMA 40W / 20W or GSM / WCDMA 20W / 40W
Then the output power dedicated to each technology is distributed among defined carriers (GSM) or limited according to installed license (WCDMA/LTE)
Maximum output power per carrier is finally determined by the number of defined carriers
Receive sensitivity to be the same as with existing Flexi EDGE BTS
* © Nokia Siemens Networks Presentation / Author / Date
Company Confidential
Sensitivity at the antenna port of the BTS without MHA
GSM900
Nominal Sensitivity 2-way diversity (STIRC) dBm
Static
TU50
TU50iFH
RA250
HT100
Static
TU50
TU50iFH
RA250
HT100
TCH/FS
-112,6
-110,6
-111,3
-111,1
-111,0
-115,6
-115,7
-116,1
-116,1
-115,7
CS-1
-116,1
-110,6
-111,8
-112,0
-110,5
-119,0
-115,7
-116,4
-116,8
-115,5
CS-2
-114,0
-107,8
-108,5
-108,3
-106,9
-116,9
-113,3
-113,9
-114,3
-112,8
CS-3
-112,8
-106,1
-106,5
-105,9
-104,5
-115,8
-111,9
-112,1
-112,6
-111,0
CS-4
-107,8
-98,2
-97,9
-111,0
-105,5
-105,1
Company Confidential
Sensitivity at the antenna port of the BTS without MHA
GSM1800
Nominal Sensitivity 2-way diversity (STIRC) dBm
Static
TU50
TU50iFH
RA130
HT100
Static
TU50
TU50iFH
RA130
HT100
TCH/FS
-112,6
-110,6
-111,2
-111,2
-111,0
-115,6
-115,8
-116,0
-116,2
-115,8
CS-1
-116,1
-111,3
-111,6
-112,2
-110,2
-119,0
-116,3
-116,5
-116,8
-115,4
CS-2
-114,0
-108,3
-108,4
-108,5
-106,4
-116,9
-113,8
-114,0
-114,3
-112,7
CS-3
-112,8
-106,3
-106,5
-106,1
-103,8
-115,8
-112,4
-112,2
-112,6
-110,9
CS-4
-107,8
-96,8
-96,7
-111,0
-105,3
-105,2
For internal use
RFM has embedded Bias-T units with over-current and under-current alarm
RFM feeds power to MHA through an antenna feeder cable
Nominal (12 dB LNA) and NSN high gain (32/33 dB and 24 dB LNA) amplifiers are supported
2-way receiver diversity
RFM module is optimized for 2RX UL diversity (two RX paths: main and div embedded in the module), however no diversity is supported either
4-way receiver diversity
2 RFM branches (pipes) have to be used in parallel to support 4RX diversity (the pipes can be connected to the same or different RFM modules)
4RX UL diversity can only be used with Intelligent Downlink Diversity (IDD)
Similar diversity gains as in case of the Flexi EDGE BTS can be expected
For internal use
Increased output power per carrier (TRX) through carrier spreading over more than one RFM/RRH pipe
Support for Intelligent Downlink Diversity (IDD)
IDD can be used with 4RX or 2RX UL diversity
IDD and standard TRXs can be used in the same sector
2 RFM branches (pipes) have to be used in parallel to support IDD (the pipes can be connected to the same or different RFM modules)
Similar diversity gains as in case of the Flexi EDGE BTS can be expected
Slide 41; Excel database; BTS conf.: 22÷27
Slide 41; Excel database; BTS conf.: 10÷15
RFM IDD with 4-UL Div
1 Carrier (one sector shown)
RFM IDD with 2-UL Div
1 Carrier (one sector shown)
For internal use
Flexi Multiradio BTS makes constructing of a feederless BTS site easier
Due to high capacity of a single RFM module the number of HW units installed at a mast top can be reduced simple construction and easy installation
There is a built-in (OBSAI RP3-1) interface between HW modules
No need to insert additional optical converters as in case of the FlexiEDGE BTS
Connection can be ensured through a multimode fibre line on the distance up to 200 m
Power supply (48VDC) has to be provided to the RFM module by a separate power distribution cable (up to 100m long)
FlexiEDGE BTS
For internal use
For internal use
Multi Carrier Power Amplifier in Flexi Multiradio BTS
Each pipe in the RF module is equipped with Multi Carrier Power Amplifier (MCPA) that amplifies simultaneously all the GSM/EDGE carriers defined in that cell
Up to six GSM/EDGE carriers can be defined in one pipe
In static Allocation, MCPA’s total output power is shared between all carriers defined in that pipe
Max o/p per carrier is directly determined by the number of defined carriers in the pipe
Max o/p per TRX = 60 W / No of carriers defined in the MCPA
More than one pipe per sector is needed for High capacity and high coverage sites,
10W
666
12W
555
15W
444
20W
333
30W
222
60W
111
For internal use
Dynamic Power Sharing in Flexi Multiradio BTS (1/3)
Dynamic Power Sharing enables unused power from different TRXs to be used dynamically between other TRXs of the same cell
BCCH carrier has statically allocated power
MaxBCCH o/p ≥ 60 W / No of carriers defined in the MCPA
Remaining MCPA power is dynamically allocated for TCH carriers
MaxTCH o/p = MaxBCCH o/p
Max o/p per carrier decreases with increasing no of defined carriers Cell coverage is reduced
Cell range
4 carriers / MCPA
6 carriers / MCPA
Max o/p per carrier does not need to be reduced with increasing no of defined carriers Cell coverage is unchanged
Cell range
Static Allocation
For internal use
Benefits
Capacity Enhancement : More CS and PS connections can be served
Coverage Enhancement : More distant and weak CS&PS connection can be served
Cost saving: Needed less radio modules for almost same DL coverage
Implementation
Step 1 : RG301555 Higher average Power per TRX, Available in RG10 EP 5.1 and EX3.1, MP1,0
Step 2 : BSS21507 Flexible MCPA TX Power Pooling, Available in RG20 EP2 and BTS SW release : EX4.2
For internal use
BCCH@20W
20W
20W
20W
20W
BCCH
20W
20W
SD/8
20W
20W
20W
20W
20W
20W
08W
20W
20W
20W
12W
8W
12W
12W
8W
20W
P0
Idle
Energy Optimized TCH Allocation to steer calls requiring max power to BCCH TRX
Permanently Allocated BCCH Power
TRX2: Pmax=20W
TRX3: Pmax=20W
Admission Control to allocate the best possible channel with the available MCPA power
Example of DL power levels usage on TS basis among TRXs
Instantaneous aggregate power not exceeding 40W due to use of DTX & PC & Idle / Energy optimized
TCH Allocation feature reducing Pmax need
For internal use
RG301555 : Higher Average Power per TRX (1/2)
This is the first step towards Dynamic Power Sharing in which the gains of idle channels, DL Power control, DTX are utilised to increase the average output power per TRX.
The BCCH Power is permanently allocated and the other TRXs use the remaining pooled power
In case of temporary demand for high transmit power on all TCH carriers TX power compression in BTS is done e.g. there is a lower power used for the call than it comes from the Power Control algorithm demand
Planned Configurations:
For internal use
Implications:
In case of many Distant & Weak connections (need full DL power) the latest connection needs to be suppressed and may undergo abnormal connection release
Try to avoid BCCH attenuation with this feature. Both still work, but the full power of RM (=gain) is not available.
For internal use
RG301555 : Visibility to BSS Level KPIs
Calls density will increase with the increase in coverage (weaker connections can also be served) or capacity (busy hours volume increase)
Calls performance will remain unchanged until high load appears, then slight degradation may be observed for a single connection that undergoes suppression
Calls abnormal releases unchanged until high load appears, then slight increase will be observed
Once this feature has been implemented and simulated average busy hour traffic profile is taken, the KPI changes can be provided. Now only the theory about changes can be presented here
For internal use
This feature introduces Admission and Congestion control algorithms in BSC
Users with different DL power needs are allocated the most optimum TCH within a cell so that the max TX power of MCPA is not exceeded
In case that BSC overbooks power BTS uses an algorithm to compress power of the mobiles so that power can be kept in the limit
In case higher power is needed of ongoing call, BSC performs intracell handover to make sure that total MCPA TX power is not exceeded
Supported Configurations
For internal use
BSS21507 : Flexible MCPA TX Power Pooling (2/2)
In case of many distant &weak connections (need full DL power) all or several the adjacent connections (reside on same pipe and on the same timeslot) may need to be equally suppressed and may more rarely undergo abnormal connection release
For internal use
BSS21507 : Flexible MCPA TX Power Pooling (2/2)
In case of many distant &weak connections (need full DL power) all or several the adjacent connections (reside on same pipe and on the same timeslot) may need to be equally suppressed and may more rarely undergo abnormal connection release
For internal use
Other Related Features
BSS20958 Energy Saving Mode for BCCH TRX
Reduces electricity consumption by reducing the transmit power of the BCCH TRX
The dummy bursts on idle circuit switched channels of the BCCH carrier are transmitted at 2 dB lower power level
Additionally, the feature enables a 2 dB dynamic power control on active dedicated circuit switched channels of the BCCH TRX.
This saved power can be used with the Flexible MCPA TX power pooling feature in other TRXs than BCCH TRX
BSS21222 Energy Optimized TCH Allocation
This feature steers the users requiring higher DL power to BCCH TRX
This means that MS requiring higher DL power is served by BCCH TRX and the remaining users for TCH TRXs may not need higher DL power resulting in better KPIs
For internal use
For internal use
System Module structure has internal redundancy - single failure does not necessary bring the whole System Module down
High Power Amplifier efficiency and high RF integration level lead to low power consumption and low heat dissipation, resulting improved reliability due to lower operating temperatures inside the RF Module and Remote RF Head (RRH)
Maintenance is improved by module integration and automatic fault detection procedures complemented by efficient recovery and remote control features in the SW
Special attention has been paid to the Flexi SW start-up time, which e.g. minimises downtime when a new SW package is taken into use
Several modules in Flexi Multiradio BTS site are the same as with Flexi EDGE and Flexi WCDMA BTS, e.g. Flexi Power and Battery back-up Module, thus bringing spare parts synergies among Flexi platform products
For internal use
System Module Redundancy
Baseband (BB) capacity in the System Module is implemented as a resource pool consisting of three BB sub-assemblies
Each BB sub-assembly act as a redundant resource in case of a failure of one.
System Module is able to maintain traffic with limited capacity in case of BB sub-assembly, RF Module or fan failure.
Redundancy in fan modules ensures a proper operation in case of a fan failure
RF Module Redundancy
1 RFM has 3 Tx chains and three separate PA modules. Failure of one Tx chain may causes a reduction in capacity but does not cause a total loss of service
RX-diversity provides redundancy for the receiver and the radio remains operational though the other receiver within a branch is down.
For configuration involving more than 1 RFM, the cell is spread over two or multiple branches in two or multiple radios. In case of failure of any branch, the radio control channels can be moved to another branch in case of a failure.
For internal use
RP3 redundancy
It is possible to have separate RP3 connection to the radio from both GSM and WCDMA system modules in concurrent operation.
If one RP3 connection is cut, at least one technology remains operational and there is not a total loss of service
If both the system modules are chained and RP3 -1 capacity allows, both the technologies can remain operational
Flexi Power Supply redundancy
Flexi Power supply Module is compact and modular AC/DC and battery backup unit with 4 sub-module slots for:
1…4 x 1kW rectifier
1…3 x Lithium-Ion battery
Power supply Module with 1...3 rectifiers is able to support N+1 redundancy
Flexi Power Supply
For internal use
Example: RF Module Redundancy for cells spread over two or multiple MCPA Branches
Sector 1
Sector 3
Sector 2
Sectors spread over two MCPA Chains
Failure of 1 TX chain does not result in loss of service.
The control channels are automatically reconfigured to the other branch in case of a failure
For internal use
Improved cooling with Fans
Failure rate of a component depends exponentially on the the temperature which the component has (Arrhenius equation)
Fans ensure that component temperature can be kept almost constant for a wide environmental temperature range this maintaining almost the same reliability
RF/System/Power Supply module controls the fan speed according to the temperature information measured by sensors inside the module
Fan unit contains two redundant fans enabling module operation at normal temperatures, even with one fan (max. 30°C/86F)
Field MTBF for fan unit is currently > 4,000,000 Hours (465 years). Fans are field replaceable
Operating temperature
For internal use
The radio technology is changed from single carrier power amplifiers to multi carrier power amplifiers (MCPA).
No legacy antenna combiners are needed to combine the different TRX outputs to a common antenna line.
Baseband processing is now centralized to the system module instead of distributed to the radio modules as in Flexi EDGE BTS.
The interconnection between the system module and the radio module is changed from Ethernet based electrical connection as in the Flexi EDGE BTS to optical OBSAI connection as in Flexi WCDMA BTS.
The Flexi Multiradio Supports Feederless sites without optical optional converter modules.
Key differences: Flexi Multiradio BTS vs. Flexi EDGE BTS
For internal use
GSM
Channel
Numbers
3GPP
operating
band
Duplex
distance
FXCA
850MHz
FXFA
1900MHz

multi radio basic

Documents