Abis Optimization

1 Copyright 2007 Nokia Siemens Networks. All rights reserved.For internal use

NSN Abis optimization


Content

• Abis optimization technology• „One Pipe“• Products• OSS integration• References• Summary


Dynamic/ Flexible Abis & Abis Optimization

Dynamic/ Flexible Abis

• works on flexible allocation and efficient sharing of resources to avoid Abis explosion as consequence of EDGE BW demand.

Abis Optimization

• works on Abis traffic removing no-info data (voice silence, idle TRAU frames, pattern bits,…).

• Both the mechanisms aim at reducing the BW requirement on Abis but are not in conflict and can be deployed at same time


Dynamic Abis

• Pooling of data• Non blocking• Fast adaptation of codecs (20ms)• Statistical multiplexing over sectors and TRX for EGPRS• Optimizes the usage of the transmission bandwidth

4+4+4

0

0,5

1

1,5

2

2,5

3

3,5

Dyn Abis Static Abis (per sector) Static Abis (per TRX)

E1

Example: 4+4+45 TSL for EGPRS

444 Static Abis (per TRX) 444 Static Abis (per sector) 444 Dyn Abis0 0 0 0 0 01 TCH TCH TCH TCH TRX1 1 TCH TCH TCH TCH TRX5 1 TCH TCH TCH TCH TRX9 1 TCH TCH TCH TCH TRX1 1 TCH TCH TCH TCH TRX9 1 TCH TCH TRX12 TCH TCH TCH GPRS 2 TCH TCH TCH GPRS 2 TCH TCH TCH GPRS 2 TCH TCH TCH GPRS 2 TCH TCH TCH GPRS 2 TCH TCH TCH TCH3 3 3 3 TCH TCH TCH TCH TRX2 3 TCH TCH TCH TCH TRX10 3 TCH TCH TRX24 4 4 4 TCH TCH TCH GPRS 4 TCH TCH TCH GPRS 4 TCH TCH TCH TCH5 EGPRS 5 EGPRS 5 EGPRS 5 TCH TCH TCH TCH TRX3 5 TCH TCH TCH TCH TRX11 5 TCH TCH TRX36 6 6 6 TCH TCH TCH GPRS 6 TCH TCH TCH GPRS 6 TCH TCH TCH TCH7 7 7 7 TCH TCH TCH TCH TRX4 7 TCH TCH TCH TCH TRX12 7 TCH TCH TCH TCH TRX48 TCH TCH TCH TCH TRX2 8 TCH TCH TCH TCH TRX6 8 TCH TCH TCH TCH TRX10 8 TCH TCH TCH GPRS 8 TCH TCH TCH GPRS 8 TCH TCH TCH GPRS

9 TCH TCH TCH GPRS 9 TCH TCH TCH GPRS 9 TCH TCH TCH GPRS 9 9 9 TCH TCH TRX510 10 10 10 10 10 TCH TCH TCH TCH11 11 11 11 EGPRS 11 EGPRS 11 TCH TCH TRX612 EGPRS 12 EGPRS 12 EGPRS 12 12 12 TCH TCH TCH TCH13 13 13 13 13 13 TCH TCH TRX714 14 14 14 TCH TCH TCH TCH TRX5 14 14 TCH TCH TCH TCH15 TCH TCH TCH TCH TRX3 15 TCH TCH TCH TCH TRX7 15 TCH TCH TCH TCH TRX11 15 TCH TCH TCH GPRS 15 15 TCH TCH TCH TCH TRX816 TCH TCH TCH GPRS 16 TCH TCH TCH GPRS 16 TCH TCH TCH GPRS 16 TCH TCH TCH TCH TRX6 16 16 TCH TCH TCH GPRS

17 17 17 17 TCH TCH TCH GPRS 17 17 TCH TCH TRX918 18 18 18 TCH TCH TCH TCH TRX7 18 18 TCH TCH TCH TCH19 EGPRS 19 EGPRS 19 EGPRS 19 TCH TCH TCH GPRS 19 19 TCH TCH TRX1020 20 20 20 TCH TCH TCH TCH TRX8 20 20 TCH TCH TCH TCH21 21 21 21 TCH TCH TCH GPRS 21 21 TCH TCH TRX1122 TCH TCH TCH TCH TRX4 22 TCH TCH TCH TCH TRX8 22 TCH TCH TCH TCH TRX12 22 22 22 TCH TCH TCH TCH23 TCH TCH TCH GPRS 23 TCH TCH TCH GPRS 23 TCH TCH TCH GPRS 23 23 23 TCH TCH TCH TCH TRX1224 24 24 24 EGPRS 24 24 TCH TCH TCH GPRS

25 25 25 25 25 2526 EGPRS 26 EGPRS 26 EGPRS 26 26 2627 27 27 27 27 27 EDAP28 28 28 28 28 2829 29 29 29 29 2930 30 30 30 30 3031 31 31 31 31 31

TRX SIG11

TRX SIG7 TRX SIG4OMU TRX SIG12

TRX SIG6

TRX SIG8

TRX SIG9

TRX SIG10

TRX SIG1

TRX SIG2

TRX SIG3

TRX SIG5

TRX SIG5 TRX SIG6

OMU

TRX SIG1 TRX SIG2TRX SIG3 TRX SIG4

OMU

TRX SIG9 TRX SIG10TRX SIG3 TRX SIG4 TRX SIG11TRX SIG12TRX SIG7 TRX SIG8

OMU

TRX SIG5 TRX SIG6TRX SIG7 TRX SIG8

OMU

TRX SIG1 TRX SIG2

OMU

TRX SIG9 TRX SIG10TRX SIG11TRX SIG12


Abis Optimization

• Reduce the number of Leased Lines from BTS’s to BSC• Add TRX/ EDGE capacity without increasing bandwidth• Free Bandwidth for 3G traffic

• Optimize Abis with a non traffic affecting algorithm• Codec aware and agnostic mechanism • Solution applicable over Abis or Asub/Ater

BTS

BSCBTS

BTS

E1/T1GSM TDM

E1/T1GSM TDM

E1/T1GSM TDM

SDH/SONETLeased lines

BTS

BTS

BTS

E1/T1GSM TDM

E1/T1GSM TDM

E1/T1GSM TDM

hiD3105

SDH/SONETLeased lines

hiD31xx (20,40HD)

BSC

Optimize uplinkReconstruct downlink

Reconstruct uplinkOptimize downlink


Principle of Abis Optimization

Efficient Abis implementations are characterized by• Dynamic implementation on Abis for AMR, (E)GPRS and EDGE• Compression for FR/HR speech on Abis, i.e. suppression of idle frames in silence

periods of calls ATM for efficient aggregation

E1(TDM) Ch1 Ch2 Ch3 Ch4

Ch1 Ch2 Ch3 Ch4

E1(TDM)

Ch128

Ch128

E1(TDM) Ch1 Ch2 Ch3 Ch4 Ch128

E1(ATM)

Idle channel

Abis

ATM/TDM BSC

TRAUAbis

TDM Asub/Ater

GSMBTS

MSC

Asub/Ater optimization

Abis GSMBTS

Abis optimization

E1s TDM

E1s TDM


Vendor B codec agnostic optimization

Nokia Siemens Networks Abis optimization~50% more subscribers at same Backhaul costs

Nokia Siemens Networks codec aware optimization

Codec aware

Up to 50%

Codec agnostic

~ 30%

E1(TDM)

Ch1 Ch2 Ch3 Ch4 Ch128

Idle channel



E1(TDM)

E1(TDM)

E1(ATM)

E1(TDM)


Idle channel



E1(TDM)

E1(TDM)

E1(ATM)


What about Local Switching?

• Local switching within one cell, site or BSC can beused as Abis bandwidth saving solution

• BUT– No savings for mobile to fixed calls nor for data calls– Very limited application (voice - mobile to mobile) and limited usage (rural

village as fixed phone replacement single operator)• NSN solution:

– Village connection for simple and affordable rural village connectivity– Abis optimization to aggregate traffic, gain from statistical multiplexing and to

benefit from full GSM/ EDGE feature set– Local switching for a cluster of BTS with high amount of local calls connected

over satellite to BSC

BTS

BSC

BTS

IP Abis


Local switching* BSS13

Feature ID(s): BSS21436

Reduced OPEX for remote coverage

• Calls within the same cell, BTS or cluster are switched locally• No user bandwidth on Abis• High savings for backhaul costs• Inexpensive satellite connectivity for remote town coverage

BTS

BTS

BTS

BSC

Minimized bandwidth

Locally switched

*Late feature


BTS

BTS

BTS

BTS

BTS

BTS

BTS

BTS

BTS

Network Trial results

DSO Used

%E1 Utilization

17/30 57

14/30 47

14/30 47

30/30 100

21/30 70

14/30 47

17/30 57

26/30 87

21/30 70

5/30 17

Towards the BSC 3.48E1 ~ 4E1

Total E1 compression = 60% (64 E1s)

E1 aggregation gain = 40% (106 E1s)

Abis Optimization gain = 20% (108 E1s) or 33% (64 E1s)

Note: vendors can refer to BW saving rather than E1 savings:Min BW savings (103.48 E1s) = 65,2% or (63.48 E1s) = 42% Max BW savings (102.84 E1s) = 72,6% or (62.84 E1s) = 53%

Site #1 - #10

Input BW = 179 DS0(64K TS) = 6xE1

BTS

Max = 3.48 E1Min = 2.84 E1


BTS

Example Network Scenario

E1

BTS

E1

ATMAbis Opt VCC

Up to 10 E1s (10 BTSs in case of 1 E1 per BTS) can be optimized with a single hiD3105 (up to 16 E1/T1 ports available)

Cell Site Controller Site

6 (or less) E1 instead of 10 E1s

40 % OPEX saving

BSC

E1

10 B

TSs


Abis optimization - delaysEvery Abis compression adds an additional delay on the Abis interface and therefore causes an impact on BSS performances. Typical values for hiD are:

Additional Abis delay has an impact on• Ping delay

Overall time is increase by four times the additional Abis delay (one way)

• Data throughput (TCP/IP ramp-up) Lower rates. More critical in case of small files than for big files due to hand-shaking mechanism

• AMR link adaptation Slower reactive procedure

• Voice quality If overall RTT < 50msec, it’s not critical as user doesn’t get perception of such delay

• HO drops KPI can indicate slightly higher drop rates due to longer time needed by HO procedure

Voice < 23ms ; < 13ms configurable

Ping delay < 8ms one way

Data throughput < 8ms one way

AMR link adapt. < 8ms* one way

*) current implementation status – may change


„One Pipe“


BTS

Transport convergence “One Pipe” 1. Example

E1

NB

E1

BSC

E1

RNC

STM1

ATM

Abis Opt VCC3G VCC

Small BTS 1/1/1:• ~6 out of 30 64Kbit TSs used,• ~384Kbit/s needed

• CBR class for Rel’99, • UBR+ class for HSDPA


1 E1 instead of 2 E1s 50 % OPEX saving

~ 1.7Mbit/s for 3G services assuming 20% Abis Opt gain


BTS

Transport convergence “One Pipe” 2. Example

E1

NB

E1

BSC

E1

RNC

STM1

ATM

Abis Opt VCC3G VCC

Small BTS, up to 15 TRXs per E1/T1

NodeBs with HSDPA will require more than one E1/T1


2 IMA E1s instead of 3 E1s

33 % OPEX saving


“One Pipe” Why ATM based ?

• Today’s Iub is ATM based as well. No need of a network revolution but a smooth evolution towards convergence. • ATM is most efficient over E1/T1s

• IP statistical multiplexing gain over few E1/T1s is limited• IP header is too heavy (20 bytes and probably additional bytes for VLAN and/or UDP or MPLS) over few E1/T1s

• IP implies to take in consideration the network security topic • Hard and fine granular QoS of telecom world requires a sophisticated scheduling mechanisms

• Solution work with ATM-based 3G RAN and TDM-based 2G BSS • Today’s investment can be then reused for a further evolution step towards IP/Ethernet transport as hiDs supports also IP/Ethernet.• Future NSN integrated solutions (CESoP and ATMoP/PWE) will interwork with hiD.


Products


hiD

314

0HD

SURPASS hiD 3100 Mobile Transport Gateways

Main characteristics:•11 service cards•2 Gbps throughput•Fully redundant chassis

Port density:•44 STM-1 ports•11 STM-4 ports•693 E1 ports•4 GE + 16FE

Main characteristics•5 service cards•2 Gbps throughput•Fully redundant chassis

Port density:•20 STM-1 ports•315 E1 ports•4 GE + 16 FE

Main characteristics•2 service expansion cards•622 Mbps throughput•1HU form factor

Port density:•16 E1 ports•6 FE ports•2 GE ports

hiD

312

0hi

D 3

105


SURPASS hiD 3105 Mobile Access Gateway

Flash Memory

Management / Serial

DC Power

8xE1/T1 ATM/IMA/TDM

Expansion Module - Abis Optimisation - CESoP - ATMoP - additional ATM/IMA E1 ports

Alarms & I/O Discrete 6 x 100BaseT

1 x 100BaseX (SFP)

2 x 1000BaseX (SFP)


SURPASS hiD3120

•5-service slots platform

•up to 20 STM-1 ports

•up to 315 E1 ATM/IMA ports

•up to 40 100BaseT Ethernet

•up to 10 1000BaseX Ethernet

•2 Gbps switching capacity

•Mid-plane cage architecture

•Desktop mount option

•2 Power Supplies

•2 Control Cards


SURPASS hiD3140HD

•11-service slots platform

•up to 44 STM-1/OC3 ports

•up to 693 E1/T1 ATM/IMA ports

•up to 88 100BaseT Ethernet

•up to 22 1000BaseX Ethernet

•2 Gb/s switching capacity

•Backplane architecture

•Back-to-back option

•3 Power Supplies (2+1 red)

•2 Control Cards (1+1 red)

•Card redundancy

•1:1 and 1:N

•APS


OSS integration


hiD31xx has a own Network Management Platform, named EM-hiD, designed for:

Full node configuration management support

• Security management• Fault management (integration with

RC done, and with NetAct planned)• Data collection for performance

management and accounting • Enhancement of the node

management feature, including multiple nodes SW download, node database backup and restore, and inventory management

• Add-on optional SURPASS EM-hiD 3000 features include the Northbound CORBA interface.

EM-hiD RC/NetAct

hiD Transport Network

Radio AccessNetwork

Alarms

CORBA(TMF 513)

Database

...ConfigurationFault Data Collection Security

CORBA(TMF 513)

Database

...ConfigurationFault Data Collection Security

SURPASS EM-hiD

SURPASShiD 3000

SURPASShiD 3000

SURPASShiD 3000

SURPASShiD 3000

OSS


OSS integration – steps

Two integration steps1. Fault Management and GUI cut-

through• Forwarding of alarms, full alarm

synchronization / integration to Regional Cluster

• ACI EM-hiD launched from NetAct

2. Performance Management• Integration to NPM-RS• Integration to Regional Reporter

planned on top of OSS5.1


NetAct

AccessIntegrator – Integration Capabilities

CORBA* or SNMP

InventoryManagement

Fault Management

Performance &Accounting

Management

Configuration Management &

Service Provisioning

CORBA* orXML FILE IFFILE IFCORBA* or

FILE IFCORBA* - TMF 513/608/814 compliant

SURPASS hiX 5xxx

- hiX 5620- hiX 5625- hiX 5630-hiX 5635- hiX 5750- hiX 5701- hiX 5703- hiX 5705- hiX 5709

SNMPSNMPSNMP South Bound InterfacingSNMP protocol towards

theNetwork Elements(proprietary info model)

North Bound InterfacingOpen I/Fs for OSS

integration

ACI-E Element Management System

SURPASS hiD 66xx

-hiD 6605- hiD 6610- hiD 6615

- hiD 6630- hiD 6650- hiD 6670- hiD 6680

SURPASS hiD 3xxx

- hiD 3140HD- hiD 3120- hiD 3105


Example ATM / T1 Configuration Management


Example Status Display 3105


Illustration of available PM counters


Summary


Summary

• Abis optimizer is most efficient at Hub sites-> Statistical multiplexing

• NSN e2e solution-> only product for codec agnostic and codec aware optimization

• Better quality and thruput-> Introduces lower delay than competitors optimization methods

• More flexible than local switching-> not only applied to mobile to mobile voice calls within same

BTS but to all traffic

• One Pipe solution over traditional TDM-> Optimization over ATM enables liquid BW sharing with 3G

Documents

Abis Optimization