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Small Cells: Enterprise, Metro & Rural Femtocells for 3G

Mindspeed Technologies Mobile World Congress Feb 27 - March 1, 2012

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Enterprise and Metro 3G Small Cells

Requirements for Enterprise and Metro 3G Baseband Stable PHY

RX Diversity Support (uplink user count)

MIMO/Dual Carrier Support

Multiple SKUs supported off of common SW and minimum PCB variants

SmartSignaling™

Wide cell radius for rural applications (3km)

High mobility for rural and metro (120km/h)

Soft Handover support

Required for outdoor cells

Best customer experience for indoor

Wide range of user counts

Low cost and low power

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Small Cell Platform: Femtocell Economics Serves wide range of applications

User

Count

8 users

PC3024

PC3008

PC3032

SOHO

Enterprise

Metro

Rural

16-24 users

64 users

32 users

PC3064

Enterprise Femtocell Public Space Picocell Residential Femtocell

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PC30xx Low Cost Femto Products Single PCB, Single SW load

PC3008 Next Generation Femto

8-users RX Diversity 13-20dBm

PC3016

Small Office Femto 16 Users

2TX + RX Diversity 20dBm

PC3008 Residential Femto

8-users SISO

13-20dBm

PC3016 Small Office Femto

16 Users RX Diversity

20dBm

PC30xx

Low Cost

User Count

Pe

rfo

rman

ce

PC3032 Metro

32 Users LABS

2TX + RX Diversity 24dBm

PC3024 Enterprise 24-users

2TX + RX Diversity 24dBm

PC30xx

High Performance

One PCB, 4 product SKUs

One PCB, 2 product SKUs

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smartSignaling™ Benefits

Reduced Signaling Traffic in the Network

Higher Effective User Count

Improved UE Battery Life

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smartSignaling™ Reduced Signaling

Before smartSignaling™ - UEs cycle between Idle and cell_DCH states to save power

- Connection is created and torn down for each transition

Idle

Mode

cell_DCH

cell_FACH

cell_PCH/

URA_PCH

Data

Inactivity

Data

Inactivity

Large Data

Exchange

Date/Control

To be Sent

Small Data

Exchange

RRC

Connection

Request

RRC

Connection

Release

15-20

messages to

the network

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smartSignaling™ Reduced Signaling Load

Enhanced cell_FACH

New states supported in the UE - Cell_FACH/cell_PCH/URA_PCH

- UE connection state is maintained

- Less messaging traffic as connection is not torn down

- Data transmission still occurs using common channels

• RACH/FACH (low speed UL/DL)

• Common E-DCH (high speed UL)

• HSPDA is shared (high speed DL)

Idle

Mode

cell_DCH

cell_FACH

cell_PCH/

URA_PCH

Data

Inactivity

Data

Inactivity

Large Data

Exchange

Date/Control

To be Sent

Small Data

Exchange

RRC

Connection

Request

RRC

Connection

Release

ce

ll_D

CH

ce

ll_F

AC

H

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smartSignaling™ Higher Effective User Count

Dedicated channels are not used to maintain connection

Data users not limited by dedicated channel capacity

- Traditional ‘user count’

Limited instead by RACH/FACH capacity, common channel capacity

Results in 100s of users being supported

ce

ll_D

CH

ce

ll_F

AC

H

100s of UEs

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smartSignaling™ Improved UE battery life

Enhanced cell_FACH states use lower power on PA

Much improved battery life compared to connections with dedicated channels

ce

ll_D

CH

ce

ll_F

AC

H

Idle

Mode

cell_DCH

cell_FACH

cell_PCH/

URA_PCH

Data

Inactivity

Data

Inactivity

Large Data

Exchange

Date/Control

To be Sent

Small Data

Exchange

RRC

Connection

Request

RRC

Connection

Release

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Rx Diversity

Two antennas with maximal ratio combining - Improved performance relative to simple antenna switching

No loss of user/channel capacity

Improves reception and uplink performance

Improves pole capacity of the UE - Vital in order to support capacity much above 8 users

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DC– Dual Cell/Dual Carrier

What is Dual Cell or Dual Carrier? - Use of 2 adjacent 5 MHz channels in DL and/or UL (release 8) - Non-adjacent channels (Release 9)

Why - Better data rates where radio conditions don’t favour MIMO

• MIMO requires good channel conditions and low correlation between antennas

- Scheduling gains improve user experience • Throughput • Latency • Cell balancing

- Better capacity than with separate NodeB implementation - Better throughput and capacity than MIMO - Macrocell parity - UE categories 21-24 required

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PC3032 Public Network / Picocell

Local Area Basestation defined class in 3GPP -- Picocell - High data rates and user capacity - Maximum Tx power ≤ 24 dBm - 120 km/h UE mobility

PC3032M enables a Picocell - 32 users - TX MIMO or Dual Carrier - RX Diversity - Soft Handover - Metro / City centre - Rural

Femtocell Economics - SoC Baseband - Multiple RF Providers

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Soft-Handover Solves Problems in the Enterprise/Metro

In Soft Handover overlapping NodeBs

Communicate simultaneously with UE.

DL signal is summed at UE. Similar for UL

Case which reduces UE UL interference.

Without Soft Handover calls can

get dropped

Enterprise Femtocells must support

Soft Handover to work effectively in

dense deployments