technology-lifestyle: FemtoCell dan WiFi Solusi Peningkatan Coverage dan Kapasitas Jaringan

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Wednesday, August 8, 2012

FemtoCell dan WiFi Solusi Peningkatan Coverage dan Kapasitas Jaringan

Small Cell
Small cell terdiri dari femto, pico, micro dan metro cell merupakan wireless access point yang memiliki power yang rendah, bekerja pada spektrum berlisensi, diatur oleh operator dan memiliki fitur pintar dipada bagian pinggir. Memberikan peningkatan coverage jaringan seluler, dan mampu memberikan kapasitas dan aplikasi untuk daerah dirumah, perkantoran, metropolitan maupun area rural. 
Small cell ada karena permintaan akses data semakin meningkat dan memiliki trend positif, sehingga operator memerkukan lebih banyak perangkat base station dan hal ini akan menambah jumlah small cell. 

Wifi adalah teknologi wireless 802.11 yang memberikan keamanan, kecepatan, konektifitas dalam aksesnya. Wifi mampu menghubungkan setiap perangkat dengan perangkat lainnya, atau perangkat dengan internet, dan jika menggunakan jaringan kabel akan menggunakan teknologi ethernet. Wifi bekerja pada spektrum frekuensi 2.4 GHz dan 5 GHz. Permasalahan kapasitas dan spektrum yang menjadi masalah utama pada jaringan seluler akan mendukung untuk penggunaan Wifi. 

Perbandingan FemtoCell dengan WiFi Dari Segi Teknologi

Frequency Band
·   2.1 GHz on WCDMA or HSPA
·   700 MHz, 800 MHz, 2,6 GHz on LTE or LTE Advance
·   2.3 GHz on Mobile Wimax or LTE
·  2.4 GHz based on IEEE 801.11 b/g/n
·  5 GHz based on IEEE a/n/ac
Systems Bandwidth
·   5 MHz on 3G
·   Up to 20 MHz on 4G
·    5 MHz, 10 MHz, 20 MHz
·    40 MHz (IEEE 802.11n)
·    80 MHz, 160 MHz (IEEE 802.11ac)
Data Rate
• WCDMA – 384 kbps, HSDPA – 14.4 Mbps (DL)
• LTE – 100 Mbps (DL, 2X2 MIMO)
• WiBro (802.16) – 50 Mbps (DL, 2X2 MIMO)
• LTE-A & WIMAX 802.16m – up to 1 Gbps
• Up to 450 Mbps (IEEE 802.11n)
• Up to 7 Gbps (IEEE 802.11ac)
Communication Range
• 10 – 30 m
• Up to 100 m

Perbandingan FemtoCell dengan WiFi Dari Sisi Coverage dan Kapasitas

 Key Aspect
Spectrum Availability
Licensed band.
Must re-use operator’s available spectrum allocation. Therefore mainly used for coverage extension (as well as capacity improvement)
Un licensed band.
Operator need not concern with pectrum related issues as with femtocells
Indoor Coverage
Up to 10-30 m (transmit power of 1mW to 100 mW).
Power level will depend on the macro network to avoid/mitigate interference.
Up to 100m (transmit power of up to 1W)
Power levels of most Wi-Fi APs are higher
than femtocells
Interference Issues
Co-channel interference with macrocell.
Interference avoidance and management
techniques (Self Organized Networks - SON) will be necessary .
interference cancellation features in Wi-Fi (Cognitive Radio)(though interference from non Wi-Fi unlicensed band devices can be a
Network Planning
Operator effort is needed for careful frequency planning and interference avoidance, which is also complicated by mobility of femtocells
No special effort needed on network
Data Rates
WCDMA – 384 kbps, HSDPA – 14.4 Mbps (DL)
LTE – 100 Mbps (DL, 2X2 MIMO)
WiBro (802.16) – 50 Mbps (DL, 2X2 MIMO)
LTE-A & WIMAX 802.16m – up to 1 Gbps
Up to 450 Mbps (IEEE 802.11n)
Up to 7 Gbps (IEEE 802.11ac)
Possibility to provide LTE like data services
in a 3G environment
Data Offloading
Data offloading is inherently supported,
making it possible to uniform data plan
throughout the network
Data off loading is not inherently supported. However 3GPP is currently standardizing aspects such mobility management, policy control and charging seamless interworking with mobile networks

Perbandingan Lain FemtoCell dengan WiFi 

Key Aspect
Seamless Communication
Handoff Support
Use the same technology as macro cells. Easy for hierarchical handoff.
Needs a user triggered mechanism.
Aspects of seamless mobility (PS) are currently being standardized
Quality of Service (QoS)
As the license band is managed by the operator QoS is carefully managed
Operator may not have control over QoS unless the Wi-Fi network is managed by the operator
Device Support
No special considerations on the device
Device needs to have Wi-Fi (which most smart phones do
Deployment Aspect
Total Cost of Ownership
Deployed by the operator. And may be paid for by the consumer.
There is a possibility of partnering with third parties for Wi-Fi access. Numerous
Wi-Fi deployments improve operator reach

Jadi, femtocell dibangun untuk meningkatkan coverage jaringan bersamaan dengan peningkatan kapasitas, dan akan semakin banyak dibangun small cell dibanding macro cell. 

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