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Concurrent
BBP
SingleBBU and CloudBB Evolution
WBBP LBBP
GTMU UMPT( U) UMPT( L)
WBBP LBBP
UMPT( GUL)
UBBP(GUL)
UMPT(GUL)
General Hardware
• 5B3M in One BBU
• From MPT Concurrent to BBP Concurrent
SingleBBU, not Just Co-BBU
SRAN8.0 Near Future Before
Concurrent
MPT
Separated
MPT
Evolve to CloudBB Step by Step
30%+ capacity improving
30%+ OPEX saving
QOE enhancing
Centralized
maintenance
Pool for capacity
gain and sharing
Open API
CloudBB
Cloud BB
Coming Near Future SRAN8.0
BBU Pooling BBU Stack
• BBU Capability Double Every Year
• BBU Architecture Evolution Matching BBU Growth
BBU RF Cabinet Controller
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L U G
SingleBBU Architecture from SRAN8.0
WBBP LBBP GTMU
WMPT LMPT
SingleRAN
Dedicated
HW for each
RAT
Separate
OAM
interface
SingleRAN
in OSS
UMPT GUL Concurrent , Making Separated G/U/L OM to SingleOM
GUL
WBBP LBBP GBBP
UMPT
Common
HW for
each RAT
Single OAM
interface
SingleOM
in OSS
GUL
SingleRAN
BBU RF Cabinet Controller
SRAN8.0 SRAN 6.0/SRAN7.0
G U L
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SingleRAN Common BBU Benifits Single Operation
SingleRAN 3 brains(~2013)
SingleRAN 1 brain (2013~)
LTE UMTS GSM
Common Hardware
LTE UMTS GSM
Common Hardware
From One Team to One Knowledge
0
2
4
6
UMTS LTE GSM SingleRAN(With
SingleOM)
Common part (iRAT part) Common part (Single RAT) RAT related
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Blade RRU
Unique Seamless Assembly Smallest & Fastest Best-in-class RF Performance
One Box
Multi-band, Multi-RAT and
Multi-sector Scalability
12L/14KG
Industry’s most lightweight
macro RRU, three modules
installed under 5 minutes
Up to10W/L Power Density
Up to 60MHz IBW
30% Less Power Consumption
Scenario 2:
Band X + Y
Or Sector 1 + 2
Scenario 3:
Band X + Y + Z
Or Sector 1 + 2 + 3
Scenario 1:
Band X
Sector 1
Blade RRU, Designed for Multi-band and Multi-RAT Scalability
BBU RF Cabinet Controller
One Chip for
All Digital Functions
Decrease 30%
Power Consumption
ONE
Box Assembly
12L/14KG
Industry Highest Integration
Super Slim Fin
Die-Casting for ultra
high efficiency heat sink
Chimney channel
Fresh Air
Compensation
Blade RRU Flexible Installation
36L
66% Box saved per site
50% Workload saved for cable
50% Wind resistance reduction
12 Cables
2 Boxes
4 Cables
6 Boxes
Blade RRU Flexible Expansion
Band X + Y
or
Sector 1 + 2
or
4 x 4 MIMO
Band X + Y + Z
or
Sector 1 + 2 + 3
12L
24L 36L
Blade RRU Clean Site
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Uplink Shared Channel IRC
Shared Channel IRC vs. MRC
PUSCH IRC
2.4~3.7dB gain in 2Rx
5.3~5.7dB gain in 4Rx
9.55% increase UL Cell average Throughput (1X2
MMSE-IRC compared with MMSE-MRC )
Support of adaptive switch between MRC and IRC
Uplink Shared Channel (PUSCH) IRC
Interfering cell Victim cell
UEs Interfering on PUSCH
Scenario: Urban area, small ISD (Inter Site Distance) sites
Parameter Assumption
Cellular Layout Hex grid, 19 cell sites, 3 cells per site
Distance Dependant path-loss L = I + 37.6log
10R
(R in km)
I = 128.1 – 2GHz
Lognormal Shadowing Similar to UMTS 30.03, B1.4.1.4
Shadowing Standard Deviation 8dB
Correlation distance of Shadowing 50m
Shadowing Correlation Between cells 0.5
Between sectors 1.0
Antenna pattern (Horizontal)
3-sector cell sites with fixed antenna pattern
Channel Model SCME
Total BS TX power (P
total) 43 dBm – 1.25 / 5MHz carrier
46dBm - 10MHz carrier
Antenna configuration 2 or 4 for Rx, 1, 2 or 4 for Tx
4Tx: x-pol, 0.5λ
4Rx: x-pol, 0.5λ
5dB noise figure
14dBi BS antenna gain plus cable loss
UE power class 24dBm (250mW)
UE Antennas 2 or 4 Rx antennas, 1 Tx antenna
0dBi antenna gain
9dB noise figure
Inter-Cell Interference modelling Modelling the strongest interfering sectors (B=8 sectors for DL, B=10
users for UL) as spatially correlated processes whose covariance is
determined by their channel matrices
Model the remaining sectors as AWGN interferences
Minimum distance between UE and cell ≥ 35m
Thermal noise spectral density -174dBm/Hz
Users dropped evenly across the cell
dBA
AA
mdB
m
dB
20deg,70
,12min
1
2
1
20-40% increase in UL control channel coverage
Improve network access success rate
Support of adaptive switch between MRC and IRC
Uplink Control Channel (PUCCH/PRACH) IRC
Interfering cell Victim cell
UEs Interfering on PRACH and PUCCH
Scenario: Urban area’ small ISD (Inter Site Distance) sites
Control Channel IRC vs. MRC
PUCCH IRC
Format1x 1dB gain in 2Rx
Format2x 0.5dB gain in 2Rx
Format1x 2dB gain in 4Rx
Format2x 0.7dB gain in 4Rx
PRACH IRC
4~4.8dB gain in 2Rx
7.2~8.8dB gain in 4Rx
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No-Edge of UL Intra-eNodeB CoMP: Improve 10% Cell Edge UL Throughput
* Simulation assumption: 10MHz, 2-Sector CoMP
Throughput
(Mbps)
Cell Average
Throughput.
Cell Edge
Throughput
7% Increase With CoMP
Without CoMP
10% Increase
•Gain for UE1: Co-demodulated.
•Gain for UE2: Interference (UE1) Rejection.
UL CoMP w/t Co-demodulation & Interference
Rejection
Benefits*
UL Intra-eNB, Improve User throughput with software upgrade only
No CoMP
Intra-eNB CoMP
Intra-eNB CoMP Legend
LTE Feature
CC1
up to 300Mbps@2*2MIMO
CC2
Scenario:
•Intra-band CA (2CC) : 2.6G, 1.8G
•Inter-band CA(2CC): 2.6G+1.8G, 2.6G+800M,
1.8G+800M, 700M+AWS
•Up to 40MHz total bandwidth
Benefit:
•Up to 300Mbps per UE CAT6 (DL 300 / UL
50Mbps @ 2x2 MIMO)
•Fast load balance between the two LTE
carriers
Dependency:
•R10 UE need to support CA.
•Require LBBPc/LBBPd + LBBPd to support
2CC
•Intra-band CA requires that the time deviation
between the RF channels of different CC less
than 130 ns.
2.6G CC1
2.6G CC2
LTE-A UE
Intra-band CA
800M CC1
2.6G CC2
LTE-A UE
Inter-band CA
LTE Feature
LTE FDD
GSM/UMTS
Cell
Priority
UE
Individual
Priority Coverage
Suggested strategies,
System Priority
To better serve 4G-preferred UE
and offload traffic from 3G
Coverage (Better Cell)
To let UE stay in the service area
UE Individual Priority based on SPID
To provide better service
experience for subscriber.
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Handover categories
Coverage based is recommended by default at initial stage
Load based is useful when LTE traffic significantly increased
Service based is for better utilization of each radio technologies
Distance and UL quality is to manage sub optimal cases
Flexible Mobility Strategy Satisfies Different Scenarios
Based on the radio link quality
Load balance
Based on the RB utilization
Service
Based on the service Based on UL Quality
√
X
UL Quality
Coverage
Distance
Based on the distance
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LTE TDD/FDD/GSM/UMTS Interworking Standard Function
RRC_IDLE
RRC_CONNECTED
Cell Selection
Cell Reselection
Data Service Continuity
Voice Service Continuity
CS FallBack
Dual Radio UE
Redirection
Huawei Support All feature of Interworking
CCO/NACC
SRVCC
PS HO
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UE Switch ON — PLMN/Cell Initial Selection
Last RPLMN
HPLMN & EHPLMN
User Controlled PLMN Selector
with Access Technology”
Operator Controlled PLMN Selector
with Access Technology”
The PLMN of Better Wireless Quality
Other PLMN Base On Wireless Quality
PLMN Select When UE Switch On
HPLMN or EHPLMN select
Stored in UE
Set in SIM
Set in SIM
Set in UE
Suggested PLMN List in SIM card:
PLMN + E-UTRAN
PLMN + UTRAN
PLMN + GSM
Customized PLMN/Frequency List in SIM card, UE Prefers to Camp on LTE Network
The Timer of HPLMN
Reselection is Saved in SIM
Card (no less 6 min)
Suggested RAT Priority:
LTE FDD (Higher)
GSM/UMTS (Low)
GSM, UMTS, FDD cells
broadcast same priority list
in SIB
UE reads SIB and get
neighbor list, priority, and
cell reselection parameters
UE measures signal
strength of higher priority
neighbor cells
Reselection happens when
RF condition is fulfilled. UE
camps on LTE FDD
S-eNB is worse than Thresh_serving.low & T-BTS is
better than Thresh_x.low
T-eNB is better than Thresh_x.high
Cell Reselection From High -> Low Cell Reselection From Low > High
Cell Reselection
Idle Mobility — Reselection to Better Cell
Cell Reselection Principal
FDD 1800
FDD 800
UMTS/GSM
Low Prio. -> High Prio.
Happens when UE enters
Higher Priority Cell
High Prio. -> Low Prio.
Happens when UE moves
out of Higher Priority Cell
UEs camp on Cell which
providing best service
LBFD-00201803 Cell Selection and Reselection
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Connected Mobility Scheme:
Redirection/PS Handover/CCO/NACC
Proper Interworking Policy is Chosen based on UE Capability
LTE FDD
To UMTS:
PS HO > Redirection
eNodeB
To GSM:
PS HO > CCO/NACC > Redirection
GSM UMTS
LOFD-001019 PS Inter-RAT Mobility between E-UTRAN and UTRAN
LOFD-001020 PS Inter-RAT Mobility between E-UTRAN and GERAN
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Coverage-based Handover
Moves to neighbor
LTE FDD cell
Inter-Frequency
Using different event threshold to decide handover target
Handover Priority: Intra-frequency > inter-frequency , Intra-RAT > inter-RAT
Inter-RAT
LTE FDD
AWS
UMTS
Threshold of trigger Inter-
freq HO (IF A2) is higher
than threshold of trigger
Inter-RAT HO (IR A2),
which means that inter-
freq HO is triggered earlier
than inter-RAT HO.
Moves out of LTE
coverage
If UE under UMTS move to LTE coverage, there are two options:
1. Service is still provided by UMTS. When service ends, UE will
camp on LTE network by cell reselection
2. UMTS triggers Inter-RAT handover to LTE
Moves to LTE
coverage
LBFD-00201801 Coverage Based Intra-frequency Handover
LBFD-00201802 Coverage Based Inter-frequency Handover
LOFD-001019 PS Inter-RAT Mobility between E-UTRAN and UTRAN
WRFD-020126 Mobility Between UMTS and LTE
LTE FDD
700
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Load Balancing based Handover
Load balance is optimal when traffic significantly
increasing
Steering the newly-access subscriber to low-load network.
Leverage the load among LTE/UMTS network. Make full use
of LTE/UMTS network resource.
LTE FDD AWS
Offload within FDD
(intra-freq HO)
Exchange load info via
RIM Procedure
GSM 850/1900
Iur-g
UMTS 850/1900
Offload between FDD/UMTS
(inter-RAT HO)
Huawei provide the seamless
synergy among multiple layer of
the network
Load
Trigger intra-freq HO
Trigger inter-freq HO
Trigger inter-RAT HO
Trigger redirection
directly
Low
High
According to cell load
(PRB utilization ratio)
LOFD-001032 Intra-LTE Load Balancing
LOFD-001044 Inter-RAT Load Sharing to UTRAN
LOFD-001045 Inter-RAT Load Sharing to GERAN
WRFD-020306 Inter-RAT Handover Based on Load
WRFD-070004 Load Based GSM and UMTS Handover Enhancement
Based on Iur-g
WRFD-070006 GSM and UMTS Load Balancing Based on Iur-g
X
HO
Scenario: DL quality is good, but
UL quality is limited, which result
to poor service experience
Principle: When UL IBLER is
higher than threshold, trigger
handover to a better neighbor cell
√
Improve Edge User Experience in Interference or UL-Limited Scenario
LBFD-00201802 Coverage Based Inter-frequency Handover