Fixed Mobile Convergence

Fixed-mobile convergence options for businesses are increasing. But far more of them allow enterprises to install and manage their own solutions than provide service-based alternatives from mobile network operators.

“We might want to change carriers. Or we might need to use different carriers in different parts of the world where some have better coverage than others,” Tisdale says. He perceives that a carrier-based FMC service, when it’s available, would lock his company into exclusive mobile network use with that carrier.

“But the Wi-Fi element is prevalent; we’re hopeful that an Agito-like solution will allow us to use multiple carrier devices to move in and out of offices without issue,” he says.

While offerings are popping up for enterprise-based equipment to handle seamless handoff and potentially lower in-building cellular phone charges, the world’s mobile carriers currently delivering FMC – most notably, T-Mobile – are addressing the consumer market, not businesses. Mobile operators also face other distractions and tend to be more inclined to install in-building cellular systems in large customer locations to boost coverage of their own network signals than providing a dual Wi-Fi/cellular solution at this juncture.

Expect to see more coming from the carriers on this front, with the typical caveat that when carriers do something, they usually do it top-down, in a very big way. That takes time, internal buy-in and investment, and the carriers are already quite busy building out their 3G and 4G networks. They are also planning for the upcoming 700MHz spectrum auctions – which, by the way, will proceed with the open-access clause, it was decided by the FCC last week.

Some company that offering CPE with capability to do signal handoff from one network to another:

• Agito Networks with its RoamAnywhere.
• DiVitas Networks with its enterprise-based Mobile Convergence Appliance and Mobile Convergence Client since February.
• Siemens with its HiPath MobileConnect.
• Aruba Networks is currently trialing its FMC software.
• Other companies, such as Ascendent/RIM, FirstHand Technologies and Cisco offer systems that project PBX capabilities onto cellular networks, but haven’t tackled the handoff function — at least, not yet.

Wireless in the Enterprise Newsletter, By Joanie Wexler, Network World, 10/17/07

Filed under: wireless technology

GSM vs CDMA

Secara fungsi, GSM dan CDMA sama-sama perangkat akses nirkabel untuk pelanggang fix maupun bergerak. Namun secara teknologi, keduanya mempunya banyak perbedaan. Beberapa hal berikut mungkin bisa menggambarkan perbedaannya:

GSM

• GSM umumnya secara komersial digelar di frekuensi 900/1800/1900Mhz

to be completed

CDMA

• bisa digelar di semua band freq (450, 700, 850, 900, 1800, 1900 maupun 2100 Mhz)
• Kapasitas/cell besar (soft capacity)
• menggunakan mekanisme spread speactrum (SS) sehingga lebih tahan interferensi, delay spread, multipath dan fading (dengan tambahan DSP semacam interleaving, error correction, dll sehingga kualitas suaranya lebih jernih…)
• Belom lagi di SS, bisa digunakan RAKE receiver, sehingga bisa memanfaatkan multipath justru untuk mengurangi delay spread
• Dropcall kerena Handoff (HO) relatif lebih sedikit dengan menggunakan soft-HO
• lebih low power dibanding GSM
• Beberapa profile CDMA

• CDMA 1x EvDO Rev. O

UL/DL: 153Kbps / up to 2.45 Mbps (average: 600-800 Kbps)

• CDMA EvDO Rev. A

UL/DL: 1.8 Mbps/3.1 Mbps

• CDMA EvDO Rev. B

UL/DL: ???/up to 4.9 Mbps

4.9 Mbps tuh per carrier lho @ 1.25 Mhz. Rev. B dengan kemampuan Multicarriers-Multilink katanya 1 user (typical) bisa menggunakan 3 carriers simultaneously (3×4.9=15Mbps !!) dan extrimnya diatas kertas bisa menggunakan 15 carriers sekaligus (15×4.9= 73.5 Mbps)…
*Belom komersial

Referensi:

ikast3.org forum

Filed under: wireless technology