Wireless Backhaul Optimization

W i r e l e s s B a c k h a u l Op O p t i m i za za t i o n : A M a rk r k e t Wa i t i n g t o H a p p e n Don’t forget to join the telephone audio portion of today’s event z1-888-425-4170 Inside the U.S. or Canada z1-706-634-6387 International zConf. Code: 9889562 We’ll be starting at 9:00 AM EST, 2:00 PM GMT Technical Support: Reminder: 888-865-7469 U.S. or Canada Please give the telephone operator the +1-706-643-3559 International same name that you’ve used to log into *0 on the teleconference the computer portion of today’s event

How to Participate… z

To submit a text question, please type a message in to the window in your toolbar. If this window is not open, press the “Mes “Messa sage ge” ” bu butto tton. n.

z

Please be sure to select “Leade “Leaders” rs” from from the the “Send “Send To” To ” pu pull ll dow down n menu menu.. When complete, click “Send.”

How to Participate… z

To submit a text question, please type a message in to the window in your toolbar. If this window is not open, press the “Mes “Messa sage ge” ” bu butto tton. n.

z

Please be sure to select “Leade “Leaders” rs” from from the the “Send “Send To” To ” pu pull ll dow down n menu menu.. When complete, click “Send.”

Wi r e l e s s B a c k h a u l Optimization: A M ar a r k e t Wa i t i n g t o Happen Keith Mallinson EVP Research The Yankee Group [email protected]

Backhaul Management An OpEx Reduction Opportunity

Agenda    





Wireless market overview Evolving backhaul requirements Service provider business model evolution Impact of wireless backhaul on service provider OPEX Technology solutions for improving wireless backhaul efficiencies Conclusions and recommendations

4


2 .5 G/3 G M i g r a t i o n : T e c h n o l o g y Dr i v en A c r o n ym Ch o w d e r “GSM “GSM migration migration path path ” ” 80% global market by 2007 GSM

IS-136 TDMA

GPRS

2001

2004

“CDMAOne “CDMAOne migration path” 18% 18% global global market market by by 2007 2007

/ 0 2 2 0 0 1 2 00 1 / 0 2

CDMAOne

iDEN Average Practical Data Rates (per user)

WCDMA or UMTS

EDGE

CDMA2000 1X

2001/02

WiDEN

2004

20-40kbps

2004

? 40 - 180kbps

CDMA2000 1x EV DO CDMA2000 1x EV DV 300-600kbps

Throughput estimates based on February 2004 commercial service offerings by U.S. carriers and confirmed by the Yankee Group as follows: •Sprint PCS claims 50-70 kbps average with peak speeds up to 144 kbps for CDMA2000 1X; •Verizon Wireless claims 40-60 kbps with bursts up to 144 kbps for CDMA2000 1X; •AT&T Wireless claims 25-40 kbps average for GPRS and 100-130 kbps for EDGE (bursts up to 200). 5


I m p l ic a t i o ns o f T e c h n ol o gy Ev o l u t i o n o n Wi r e l e s s B a c k h a u l Requirements 

Wireless networks are becoming increasingly complex GSM/EDGE overlaid with WCDMA  TDMA overlaid with GSM/EDGE  TDMA overlaid with CDMA2000  GSM overlaid with CDMA2000 (e.g. China Unicom) 





Wireless network capacity requirements are increasing Networks are becoming increasingly extensive to include macro, micro and pico-cells

6


Se r v i c e Pr o v i d e r B u s i n e s s Ev o l u t i o n — M at u r e M ar k e t s 

Service providers have focused on rapid deployment and CAPEX minimization, with insufficient regard for OPEX 







Transmission network design and optimization has been neglected Minimization of CAPEX has resulted inefficient designs from an OPEX perspective

Service providers in mature markets are becoming increasingly focused on OPEX For network overlays (e.g. WCDMA) OPEX management becomes more challenging 

Service providers are paying a great deal of attention to the design and optimization of their transmission networks

Significant opportunities in mature markets for advanced transmission solutions 7


Se r v i c e Pr o v i d e r Op e r a t i o n a l Ex p e n d i t u r e s Cr e a t e Op p o r t u n i t i e s fo r B ac k h a u l 3%

6%

13%

15%

Total OPEX 29%

30% 34% Field Maintenance and Product Support Technical Personnel

43%

Site Rental 7%

Transmission Utilities

Technical Operations Customer Care Cost of Goods Sold Marketing Sales and Admin

Other

20% 8


L e a se d L i ne v e r su s M ic r o w a v e Transmission 





Some operators use microwave transmission to reduce leased line expenses Microwave typically used by pure-play mobile operators in Europe Microwave rarely used in North America   



10-15 percent of all transmission Consequence of tradition and focus towards lower CAPEX Difficult to transition because of existing lease obligations

Microwave used more extensively in emerging markets  

Limited availability of robust landline infrastructure Leases are often particularly expensive

9


Wi r e l e s s Se r v i c e Pr o v i d e r Business Analysis — Em e r g i ng Ma r k e t s    



Greater focus towards minimizing both CAPEX and OPEX Benefit of green field (or near green-field) implementations Significant subscriber growth and deployment occurring Challenged by lack of supporting infrastructure (e.g. terrestrial transmission) Less “tradition” and greater receptivity to alternative network architectures

Emerging Markets represent a significant opportunity for advanced transmission solutions

10


T e c h n o l o g y So l u t i o n s f o r Op t i m i zi n g T r a n s m i s s i o n GSM GSM

GSM

UMTS

UMTS

UMTS

Grooming Grooming Packetization

Independent transmission

Consolidated transmission

11

Optimized transmission


B u s i n e s s Ca s e f o r B a c k h a u l   



Average monthly price per T1/E1 is $500 in US, EUR600 in Europe Average cell site has between 1 and 2 T1/E1s Upgrades such as EDGE and WCDMA create demand additional T1/E1s Operators planning a network overlay (EDGE or WCDMA) can expect more than 30 percent savings in back haul costs

Number of sites Average T1/E1 per site (with overlay) Monthly lease cost per T1 Annual Lease Costs ($ million)

Before Optimization 10,000

After Optimization 10,000

2.75 500

1.925 500

165.00

115.50

Annual savings with Optimization ($ million)

49.50

12


Co n c l u s i o n s a n d Recommendations  







Wireless service providers business models are changing Network efficiency as opposed to speed of deployment becoming increasingly important Transmission networks in need of optimization solutions to reduce operational costs Service providers are retrofitting grooming and packetization solutions to optimize their transmission networks Expect more than 30 percent savings in transmission costs when optimization used for GSM/EDGE overlaid networks

13

Mobile Operator Considerations for Backhaul Deployment: Experience in Backhaul Opex Reduction Basilio Sadindi, Director of Operations & Keith Pitout, Technical Director

Celtel, DRC [email protected] [email protected]


B a c k h a u l Op e x Re d u c t i o n DRC Experience with NMS AccessGate application

 Celtel Network: ¾Currently 4 MSC’s, 5 BSC’s and 168 BTS sites ¾Celtel are owner of fixed backhaul MW network. ¾Completely Ericsson NSS and BSS network. ¾Currently using 24 VSAT links for remote BTS installations over a vast geographic area.

 Initial trial on one VSAT link  Expanded to two more.  Experiencing up to 50% reduction on capacity required over VSAT.

15


B a c k h a u l Op e x Re d u c t i o n Operational Experience        

Only in service for a few months. No degradation of speech quality experienced GSM Fax and Data fully functional over the link. Easy to set up and Operate. Stable and reliable. Currently in process of expanding to another 7 links Expecting a total of $250 000 per month on VSAT costs. Considering application over Microwave links.

16

Backhaul Management

B a c k h a u l Op e x Re d u c t i o n

An OpEx Reduction Opportunity

Application Example

E1 cable IP LAN Ethernet cable

3 E1 links (2 carry A.bis traffic)

Butembo Nord RBS

1 E1 link (backhaul)

Cell side AccessGate

1 E1 link (backhaul)

Satellite modem

Satellite modem

17

MSO side AccessGate

OAM Workstation with AccessView

3 E1 links (2 carry A.bis traffic)

BSC

Ericsson Expander solutions


What if the most cost-efficient alternative available comes at a price of 10.000 € per E1 per month?

Transmission 77.6%

What can be done? 19


St a n d a r d B SS RA N So l u t i o n

B sub

Circuit-Switched RBS/ BTS

Standard A”

BSC & Server

A sub

A+-interface Signaling /E1

MSC & Server

Standard A”

Standard A”

RBS/ BTS

Call routing of a PLMN-PSTN call: Via the BSC and MSC  16 kbps on the PCM  Circuit-switched Abis  Transmission TS allocated to every Basic Channel in TRU  Std: 10 TRU per E1 or 8 TRU per T1  LAPD-C: +20–30% capacity/Abis  LAPD-M: +30–50% capacity/Abis

RBS/ BTS A sub

RBS/ BTS

B sub

20


T h e L a ye r ed N e t w o r k A r c h i t e c t u r e !! 

Each layer can grow independently



Control 



End-user applications

Centralized location of servers reduces O&M cost Independent of transport technology

MSC

HLR

GMSC/Transit SG



Control

Connectivity 









Same transport for all services Free choice of transmission technology Distributed MGws enables transmission savings Enables transport of coded voice Pooled media stream resources 21

SGSN

PSTN ISDN

Connectivity

WCDMA Access MGW GSM/ EDGE Access

GGSN

MGW Internet Intranet


Ot h e r T r a n s m i s s i o n -Sa v i n g Functionality 1) Bandwidth optimization Silent call suppression, 30–50% savings on CS  Flexible Abis, up to 30% savings on packet switched  AMR subrate switching, 50% savings on CS 

2) IP Abis 30–50% lower cost per Mb over Abis (xDSL, Ethernet vs. E1/T1)  Bandwidth optimization possible on top of this 

3) Local switching 

Additional 20–50% savings on top of bandwidth optimization

22


T h e Si l e n t Ca l l Su p p r e s s i o n Solutions

Circuit-Switched

RBS/ BTS

Silent Call Supression Box

One box handles 8 E1 RBS/


Standard A”

BSC & Server

MSC & Server

Saving:  Discontinous transmission  Saving up to 50% NW impact:  HW: NMS AccessGate  SW: BSS

Silent Call

BTS Supression Box

RBS/ BTS RBS/ BTS

23


A MR Su b ra t e Sw i t c h i ng Circuit-Switched RBS/ BTS


Standard A”

BSC & Server

MSC & Server

Standard A”

RBS/ k 1 6 S T

BTS

AMR subrate switching over Abis:  Subs are ordered to AMR 7.15 kbps

Standard A” A

RBS/



B

BTS A sub

RBS/ BTS

AMR 7.15



B sub



AMR 7.15

24

Two subs can be squeezed into every 16kb Abis TS Savings: +50% on Abis AMR mobiles needed


T h e I P So l u t i o n Circuit-Switched RBS/ BTS


Standard A”

BSC & Server

MSC & Server

IP Support

IP GSM Radio Access

RBS/ BTS RBS/

IP Support

Packet-Switched Abis  Dimension transmission links based on peak traffic over link  HW: IP switch card added  SW: BSS

BTS IP Support

RBS/ BTS IP Support

25

Thank You

Wi r e l e s s B a c k h a u l Technologies


Wi r e l e s s B a c k h a u l T o d a y GSM N e t w o r k Ch a ra c t e r is t i c s   

Large number of geographically-dispersed cell sites One or more E1/T1s per cell site — inefficiently utilized New technology deployments require additional, separate, E1/T1 facilities

BSC GSM/ GPRS/ EDGE CDMA

MSC

TRAU

E1/T1s x n

E1/T1s x n

E1/T1s x n

A.bis

A.ter

A interface

2G/3G Wireless Backhaul

TDMA UMTS 28


Ea r l y B a c k h a u l Op t i m i za t i o n

BSC 

Groomer

TDM groomers save unused DS0s Simple approach  No statistical multiplexing  No help for Abis inefficiencies 

29


3 G B a c k h a u l — T he V is i o n BSC

ATM SW

ATM SW ATM SW

RNC



2G & 3G traffic combined on ATM backhaul Statistical multiplexing gain; may avoid stranded DS0s  No help with Abis inefficiencies; Adds ATM cell tax  Will be superceded by IP backhaul, eventually 

30


T y pi c a l GSM A.b i s o n E1

16 kbps TRAU channels, occupied even during silence

Unused DSOs

Multiple lightly loaded signaling channels

31


GSM 2 G B e f o r e Op t i m i za t i o n BTS MW/Fiber

2 T1/E1s A.bis

3 T1/E1s A.bis

BTS 13 TRX

BTS 22 TRX

5 T1/E1s Total BSC Central Office

32


B a c k h a u l Op t i m i za t i o n s 

Eliminate traffic from Call inactivity  Voice silence periods  Other TRAU idle frames  GPRS & EDGE idle PCU frames 

  

Multiplex signaling channels Recover stranded timeslots (TDM grooming) Handle other cell site traffic Location measurement unit  IP links for other remote third-party equipment 

33


St r i n g en t Re q u ir e m e n t s 

Radio vendor inter-op certification 



Minimum added end-to-end latency 



10 ms or more added delay has unacceptable impact on voice quality

Automatic payload analysis 



Vendor-specific interface issues are time consuming, but critical for successful deployment

Critical to avoid manual provisioning of timeslot assignments

Minimum footprint 

Typically must fit within existing BTS cabinet

35


U M T S Su p p o r t  

Remove non-active cells from the ATM Pool/multiplex UMTS traffic over the common backhaul  

Avoid inefficient ATM circuit emulation More efficient than any ATM over fractional E1

2G BTS

Cell Site

2 T1/E1s A.bis

2 T1/E1s A.bis

SPAN1SPAN2 10/100ETHERNET

2G BTS

Cell Site

SPAN1SPAN2 10/100ETHERNET

Poli cyP oint

Poli cyP oint

T1/E1 Iub 3G Node B

3G Node B RNC

BSC A interface

ATM RANAP Gateway

TDM

MSC

Central Office 37


Ev o l ut i o n t o I P B a c k h a u l 

2G & 2.5G optimizations are still required ROP* over IP

IP Network

Router Router

2G BTS

Cell Site

Router Router

2 T1/E1s A.bis SPAN1SPAN2 10/100ETHERNET

Poli cyP oint

ROP* o ver IP w /HC** ove r T1/E1

3G Node B

RNC

* ROP – RAN Optimized Protocol ** HC – IP Header Compression

ATM

BSC A interface

Mobile Switching Facilities 38


B a c k h a u l Op t i m i za t i o n Sa v e M o ne y — Su p po r t N e w Se r vi c e s 

Reduce operating expenses 



Backhaul can be 30% of OpEx

Provide new services and/or new capacity with limited or existing backhaul capacity

39

Wi r e l e s s B a c k h a u l Technologies

Q&A

Fo r m o r e i n f o r m a t i o n …. Contact: Keith

Mallinson, The Yankee Group, [email protected] Basilio

Sadindi, Celtel,

[email protected] Martin

Bäckström, Ericsson,

[email protected] Brough

Turner, NMS Communications, [email protected]

Wireless Backhaul Optimization

Recommend Documents