The Building of UniPON Networks China Mobile Communication Corp. December 2, 2009
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The Building of UniPON
Networks
China Mobile Communication Corp.
December 2, 2009
Contents
Service Requirement
UniPON Architecture
Summary
Next generation internet is the mobile internet
2.5G/3G Network WiFi Network
NGN Network LTE NetworkNext generation
Internet is
Mobile Internet!
The future of
Mobile Network
is for Internet!
Source：Research Institution of Information Communication
SoftwareVendor
Widget
Biz Model
Internet Software Vendor
Advertisement
Terminal Vendor
Network Infrastructure
Application
Infrastructure
TD-SCDMA
Terminal Software Platform
Terminal Infrastructure
Widget
Fusion
Music
platform
Media
platformmSpaces /
OMS Server
Three infrastructures for the mobile internet
…
Advertisement
Business
Customer
Residential
Customer
PON/PTN
IP over OTN/WDM
LTEEDGE
Mobile Network
Backbone &
Metro Core
Backhaul &
Access
CP/SP
LTE provides ideal performance for mobile
internet
SC-FDMA
OFDMATXTX
MIMO SDMA
High speed
Peak rate：
Downlink> 100Mbps
Uplink> 50Mbps
Spectrum efficiency:
2-4 times of HSPA
The flat IP Network and Distributed base stationFlexible frequency
configuration
Support multiple bandwidths
Support FDD&TDD
Low Delay
User plane < 10 ms
Control plane < 50 ms
CO
Switch
CPE
Difference between Switch and PON
access and aggregation
ODN
OLT
ONU
• PON is a promising technology for broadband access and
backhauling!
PON has 20km transmission capability and multiplexed with passive splitter，saving 90% of aggregation switches and space
• PON is PtoMP system，saving fibers and half of the transceivers
• Passive ODN means low Opex
Optical access - passive optical network (PON)
UniPON----single optical access infrastructure for
multi-service and multi-network
Broadband access and BBU-RRU share the uniform fiber infrastructure
PtoMP topology、similar distribution
PON provides shared bandwidth and CWDM provides high speed low delay
transport in the same passive optical distribution network
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CCCC
CHC
DRICB
- sh
elf
CCCC
CHC
DRICBBUMux1
OLT
Mux2
Mux1
Mux1
Filter1 Filter2
Metro
Area
Network
Customer
Premise
Network
RRU1 RRU2
RRU3
ONU
ONU
ONU
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DRICBBUMux1
OLT
Mux2
Mux1
Mux1
Filter1 Filter2
Metro
Area
Network
Customer
Premise
Network
RRU1 RRU2
RRU3
ONU
ONU
ONU
Provide
broadband
access with
PON
Provide BBU-
RRU transport
with CWDM
Contents
Service Requirement
UniPON Architecture
Summary
PON
Splitter
UniPON: sharing ODN for PON broadband access and
distributed base station transmission
UniPON combines PON and Distributed base station with CWDM/DWDM, sharing the ODN
UniPON improves capacity, time synchronization and efficiency for CPRI/IR transmission
OLT
WDM
ONU
ONU
RRU
BBU m*CPRI/IR
n*CPRI/IR
RRU
RRU
RRU
ONU
Expanding
without
ODN change
WDM
UniPON design objects
Construct full service access network based on UniPON
PON Broadband Access and Distributed Base Station Transmission Share the same ODN
Adopt point-to-multipoint topology which suits the distributed framework
Using WDM to provide high speed transmission channel between BBU and RRU
Key technical objects
Make best use of the existing techniques and network infrastructure with no impact on the prior standards of PON
Achieve a transmission distance of 10~20km between BBU and RRU, among which several RRUs can be cascaded.
Provide at least four pair of CWDM wavelengths for BBU and RRU.
UniPON: wavelength utilization and capacity
13
11n
m
13
31
nm
13
51
nm
13
71
nm
14
11n
m
14
31
nm
14
51
nm
15
31
nm
15
51
nm
15
71
nm
15
91
nm
16
11n
m
13
91
nm
■ 18 CWDM channels (ITU-T G.694.2)
O-Band E-Band
14
71
nm
14
91
nm
15
11n
m
S-Band L-Band
12
71
nm
12
91
nm
40 DWDM Ch
C-Band
1529.55nm - 1560.61nm
10G PON, PON upstream PON downstream
Compatible with GPON and 10G PON lambdas in UniPON system
Usually 10 spare CWDM Lambdas：1371~1451nm,1531~1611nm including absorption peak
(E-Band, G.652.A/B fiber).
Considering 10G GPON, 8 CWDM Lambdas left, it is suggested to preserve 1571~1591nm on
the first deployment step.
Usaually 40 DWDM Lambdas in C band(100GHz grid), or hybrid with CWDM
For WDM bidirectional application in single fiber:
CWDM : 3~5 links in single fiber (considering 10G GPON or not)
DWDM : 20 links in single fiber, but cost is an important factor
CPRI/IR over OTN muxponder is a cost-effective choice
10G PON downstream
CATV 1550nm
EPON: 1260~1360nm
GPON:1290~1330nm
10G PON: 1260~1280nm
PON: 1480~1500nm 10G PON: 1575~1580nm
It is possible to set 1471nm and1511nm
free with design restriction for filter and
optical module. But it will raise the cost.
UniPON solution 1—passive WDM module
1、Unified and simple ODN infrastructure with the common splitter for PON and distributed base station. The PON and BBU-RRU transmission can both reach 10km with a splitting ratio of 1:32.
2、Flexible BBU-RRU configuration, and RRU can be deployed at the end of each branch of the ODN.
Splitter
Filter1 Filter2
ONU
------ GPON System
------ BBU/RRU
.
.
.
ONU
1451 n
m
1551 n
m
1571 n
m
1591 n
m
1531 n
m
1611 n
m
Filter0
Filter0
Filter2Filter0
ONU...
------ Fiber Connector
1310/1490 nm
1310/1490 nm
1310/1490 nm
RRU RRU
RRU
OLT
MUX
1451 nm
1551 nm
1571 nm
1591 nm
1531 nm
1611 nm
BBU
Filter0
1310/1490 nm
CW
DM
Chan
nel
Power budget analysis
Fiber
Loss
Dista
-nceMux Splitter Filter0
Nu
mFilter1 Num Filter2 Num Connect Num Total Margin
Power
Budget
1310 nm( US) 0. 4 10 17. 5 1. 5 2 1. 5 0 1. 5 0 0. 4 5 26. 5 2. 5 29 dB
1490 nm( DS) 0. 3 10 17. 5 1. 5 2 1. 5 0 1. 5 0 0. 4 5 25. 5 2. 5 28 dB
CWDM( Case1) 0. 3 10 2 17. 5 1. 5 2 1. 5 1. 5 1 0. 4 2 27. 8 2. 2 30 dB
CWDM( Case2) 0. 3 10 2 17. 5 1. 5 2 1 1 1. 5 1 0. 4 2 28. 8 2. 2 31 dB
Note:
Case 1: no RRU cascaded; Case 2: two stage cascaded.
Splitter loss:3.5*5=17.5dB
MUX:10 wavelengthes multiplexed.
Margin:>2dB.
Filter1: Insertion loss of add/drop wavelength is 1.5dB, and the loss of the
wavelength going through the filter is 1dB.
Improvement:
1.Increase the output power from 0.5~5dB to 2dB with laser cost increased 30%.
2. Open the FEC function which has been deployed in the main vendors' products.
According ITU-T G.984.3, the power budget can be increased by 3dB. However, the
bandwidth efficiency will decrease by 6%.
If the FEC function can’t be enabled, then the power budget will be limited.
UniPON solution 2—active WDM module
Capacity: total 10 CWDM or 40 C-band DWDM lambdas
n*CPRI over OTN improving per lambda’s transmission capacity, and
increase power budget with FEC
GPON system
BBU/RRU WDM
Fiber connector
BBU
OLT
WDM Splitter
WDM WDM
RRU RRU
ONU
WDM
ONU
RRU
WDM ONU
Filter0PON
n*CPRI n*CPRI
n*CPRI
n*CPRI over OTN
Filter1
n*CPRI PON
n*CPRI over OTNn*CPRI
PON
n*CPRI over OTNn*CPRI
Filter2
n*CPRI over OTNn*CPRI
PON
n*CPRI over OTNn*CPRI Filter6
Filter5OA
OA
Optical amplifier is an option in CO for more DWDM power budget
PON
n*CPRI over OTNn*CPRI
Filter3
WDM Private line service:
GE/FC etc.
Power budget analysis
Note:
Case 1: no RRU cascaded; Case 2: two stage cascaded.
Splitter loss:3.5*5=17.5dB
MUX:10 wavelengthes multiplexed.
Margin:>2dB.
Filter1: Insertion loss of add/drop wavelength is 1.5dB, and the loss of the
wavelength going through the filter is 1dB.
Improvement:
1.Increase the output power from 0.5~5dB to 2dB with laser cost increased 30%.
2. Open the FEC function of GPON which has been deployed in the main vendors'
products. According ITU-T G.984.3, the power budget can be increased by 3dB.
However, the bandwidth efficiency will decrease by 6%.
3. Open the FEC function of CWDM, thus power budget can be increased by 3dB.
This Solution is recommended
Fi ber
Loss
Di st a
nce
Fi l t e
r 1
Spl i t t
er
Fi l t er 2/
Fi l t er 0 Num Fi l t er 3 Num
Connec-
t or Num Tot al Mar gi n
Power
Budget Uni t
1310 nm( US) 0. 4 10 17. 5 1. 5 2 1. 5 0 0. 4 5 26. 5 2. 5 29 dB
1490 nm( DS) 0. 3 10 17. 5 1. 5 2 1. 5 0 0. 4 5 25. 5 2. 5 28 dB
CWDM( Case1) 0. 3 10 3. 5 17. 5 3 1 1. 5 0 0. 4 0 27 2 29 dB
CWDM( Case2) 0. 3 10 3. 5 17. 5 2 1 1. 5 1 0. 4 0 27. 5 2. 5 30 dB
UniPON: deploying for multi-service
Central office/OLT/BBU site: OLT, BBU and WDM are deployed together.
Access site: ONU deployed separately. And WDM deployed with some of RRUs,
sharing the cabinet with RRU’s ACDC power converter.
λ3
ONU
RRU
λ1
λ2
ONU
Splitter
WDM and RRU share cabinet
RRUCPRI/IR
0~20Km
Access site
WDM
CPRI/IR
BBU
CPRI/IR
OLT
PON RRU
CPRI/IR
RRU
CPRI/IR
WDM
WDM
WDM
Mobile
Backhaul
λ4
RRU
CPRI/IR
WDM
ONU
UniPON demo test networking
Refer to solution 2
Combine GPON, CWDM and TDSCDMA distributed Base-station.
4 CWDM + GPON Lambdas and 2xGE private line shown in DEMO
1*CPRI over OTU1 applied (FEC enable), and the WDM module is active.
25km transmission over fiber, with a splitting ratio of 1:32
UniPON demo test platform
OLT
WDM (CO site)
WDM (Access site)
ONUFiber
Splitter
BBURRU
Contents
Service Requirement
UniPON Architecture
Summary
Summary and suggestions
UniPON’s architecture: based on PON, WDM and Distributed Base-station
UniPON’s Lambda allocation
WDM: CPRI/IR over OTN (to be standardized, discussing in ITU-T), FEC,
transmission efficiency
PON: PLC-based splitter, Class B+ or Class C+
Low cost solution: (Suggestion)
Improvement for WDM optical module (output power and sensitivity, more
power budget)
Improvement for WDM filter (Less insertion loss)
It is suggested to study the UniPON including the wavelength
assignment, FEC, high budget optical module and low
attenuation WDM components.
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