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CDMA450
Overview
CDMA450 is a TIA-EIA-IS-CDMA2000 (CDMA-MC) system deployed in 450 MHz which includes a family of standards developed by 3GPP2, published by TIA and approved by ITU for IMT-2000: CDMA2000 1X, CDMA2000 1xEV-DO and CDMA2000 1xEV-DV. Currently, CDMA2000 1X and CDMA2000 1xEV-DO are commercially available for the 450 MHz band and CDMA2000 1xEV-DV is being developed.
Advantages of CDMA450
CDMA450 advantages derive from the spectral efficiency and high-speed data capabilities of CDMA2000 and the expanded coverage afforded by a lower frequency band.
* CDMA450 provides a larger cell size compared to cell sizes in other bands, which translates to fewer cell sites and significantly lower capex and opex to service vast coverage areas
* CDMA450 offers IMT-2000 services: high-quality voice and high-speed data access
o CDMA2000 1X allows for voice capacity of up to 20 erlangs per sector/carrier
o CDMA2000 1X supports high-speed data up to 153 kbps and CDMA2000 1xEV-DO offers broadband access up to 2.4 Mbps
* Clear evolution path to advanced 3G services
* CDMA450 requires only a small amount of spectrum (1.25 MHz), a significant consideration for NMT450 operators who have 4-5 MHz allocated to them
* CDMA450 allows for a phased evolution
450 MHz Band Allocation - Worldwide
CDMA450 offers a solution for multiple markets
* Evolution of Existing NMT-450 Systems to IMT-2000: A number of operators in Eastern/Central European countries, Russia and South East Asia are using the 450 MHz band to provide wireless services with first generation analog equipment, based on the Nordic Mobile Telephone (NMT) standard. Many of these operators are digitizing and upgrading their current networks using IMT-2000 technologies. CDMA450 is the only technology commercially available to these operators which allows direct transition from a first generation system to next generation services. CDMA450 is also one of the few technologies that fits into 4-5 MHz of spectrum (requires 2 x 1.25 MHz for a single channel; can fit 3-4 CDMA450 carriers depending on the size of guard bands)
* Universal Services: Providing access to communication services (voice and Internet access) is a key priority for governments and regulators around the world, especially in developing countries. Coverage advantages of lower frequency bands offer a cost-effective solution to meet these goals. Due to the favorable propagation characteristics of lower frequencies and their associated coverage benefits, there may be significant cost advantages associated with deploying a wireless system in the 450 MHz band.
* High Speed Mobile or Fixed Data Services: The 450 MHz band can be utilized to provide broadband access for mobile or fixed data users. Many countries have indicated a need to serve their public safety communication markets to provide blue light services that include, group communication, high-speed data access, push-to-speak, video streaming and dispatch services. Some countries are also investigating the use of a high-speed data network to provide broadband access to schools, hospitals and businesses. These networks could be seen as complementary to other cellular-based networks and could be employed in either a fixed, portable or fully mobile setting depending on the application.
CDMA450 Deployments
Services based on IMT-2000 technologies (CDMA2000) are commercially deployed in 450 MHz in Europe and Asia.
CDMA450 Products
Infrastructure and device solutions are commercially available
Posted by waqasahmad
CDMA450, uses a lower frequency, so it can propogate longer distances, but it has lower traffic capacity. On paper it is a good technology to cover sparsely populated areas. But in real terms it will have to compete with other established technologies, which are stable and non proprietary. if you get some info on real world deployments of CDMA450 and associated network and Handset costs vis-a-vis GSM, pls pass it on
Posted by crouse
I found the below answer from linkedin Search. These are very good answers.
Lucent and Qualcomm lobbied hard in Europe to get former NMT450 and TETRA spectrum converted to allow use of CDMA family technologies, including various CDMA2000 flavours, from around 2002/2003. It had previously been allocated to TETRA. Inquam (partially funded by Qualcomm I think) was a key proponent on the operator side: Inquam acquired 400MHz spectrum in UK, Belgium and France from the failed TETRA operator Dolphin.
Quite a lot of deployment in Central and Eastern Europe. Spectrum is a bit limited, the 450MHz band is only 20MHz wide which needs to include a duplex gap so I guess typically 2x5MHz is the most you'll get. The other Public Access Mobile Radio (PAMR) bands were included in the debate at 380-400MHz, 410-430MHz, and 2x4MHz just below the GSM-R spectrum at 900MHz: hence you may pick up references to CDMA-PAMR. All of these bands were non-viable for the European UMTS standard which needed 2x5MHz per carrier and a proportionally wider duplex gap. There was some talk of competitive GSM450 solutions from Nokia. My understanding is that one of the key vendors of CDMA450 is Huawei.
Mobile operators in Europe who had just acquired IMT-2000 licences at 2GHz had justifiable cause to question why so soon after auctions changes of use were being put in: obviously the availability of the spectrum for mobile services changes the valuation of such a licence due to additional competition with a lower cost of coverage deployment as 450MHz propagates further. Lots of difficult negotiation in ECC and ETSI.
450MHz propagates further, which could be a mixed blessing for a CDMA technology (it can cover further, but will also interfere further away potentially reducing capacity and complicating densification). This makes it an excellent technology/frequency combination in lower population density areas and the developing world.
CDG has a lot of resources on deployment. However they are a lobbying organisation, and as such information needs to be interpreted with care as it is intended to impart a message. Of course the same goes for UMTS forum, GSM Association etc
CDMA450, uses a lower frequency, so it can propogate longer distances, but it has lower traffic capacity. On paper it is a good technology to cover sparsely populated areas. But in real terms it will have to compete with other established technologies, which are stable and non proprietary. if you get some info on real world deployments of CDMA450 and associated network and Handset costs vis-a-vis GSM, pls pass it on
Posted by nicholas_japer
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