- FDD Uplink: 832 – 862 MHz
- FDD Downlink: 791 – 821 MHz
Sunday, August 30, 2009
Saturday, August 22, 2009
With wireless subscription having reached to 441.66 Million, India has yet to catchup with other countries in 3G and LTE (Long Term Evolution) deployments. India's state-run mobile operators BSNL and MTNL have already launched commercial 3G services after getting access to spectrum last year. BSNL and MTNL have set sights on adding between 200,000 and 300,000 subscribers during the first year of operations.
DoT and finance ministry recently indicated to limit the number of slots to just four blocks of 5 MHz each in the 2.1 GHz band for 3G auctions with a view to maximizing revenue per block of spectrum. These four new entrants will be in addition to BSNL/MTNL, taking the total 3G operators per circle to five.
Even as the policy for auctioning spectrum for 3G mobile services is yet to be finalized, the Department of Telecom is already thinking about the introduction of 4G technologies such as LTE. It says some spectrum must be retained to accommodate the future needs of these operators as well as to provide for 4G technology (LTE) which will require a minimum channel of 10 MHz for the launch of service.
However telecom operators RCOM, Tata, Systema and equipment vendor Qualcomm strongly are opposing the government’s move to restrict 3G spectrum auctions to four blocks per circle. These companies want all spectrum to be put on the block so that the demand-supply equation pushes down its price.
The final decisions will be made by Empowered Group of Ministers (EGoM) in the next few weeks, based on which 3G auctions are expected either by early December or after January 2010.
It is still not clear how many operators could get 3G & LTE spectrum. Similar to 3G, LTE may come in India in 2.1 Ghz band, as 2.5 Ghz (EU LTE spectrum) is mostly used for satellite-based networks. In India most operators are looking to move to this technology by 2011, once they start making money on 3G services. MTNL & BSNL may again lead LTE deployments.
Friday, August 14, 2009
LTE standards are in matured state now with release 8 frozen. While LTE Advanced is still under works. Often the LTE standard is seen as 4G standard which is not true. 3.9G is more acceptable for LTE. So why it is not 4G? Answer is quite simple - LTE does not fulfill all requirements of ITU 4G definition.
Brief History of LTE Advanced: The ITU has introduced the term IMT Advanced to identify mobile systems whose capabilities go beyond those of IMT 2000. The IMT Advanced systems shall provide best-in-class performance attributes such as peak and sustained data rates and corresponding spectral efficiencies, capacity, latency, overall network complexity and quality-of-service management. The new capabilities of these IMT-Advanced systems are envisaged to handle a wide range of supported data rates with target peak data rates of up to approximately 100 Mbit/s for high mobility and up to approximately 1 Gbit/s for low mobility.
In order to meet this new challenge, 3GPP widened its scope to include systems beyond 3G. LTE Advanced would fulfil the 4G requirements as set by ITU. In 2008 3GPP held workshops on IMT Advanced, where the “Requirements for Further Advancements for E-UTRA” were gathered. The resulting Technical Report 36.913 has been now published.
- LTE - DL: 100 Mbps, UL: 50 Mbps
- LTE Advanced - DL: 1 Gbps, UL: 500 Mbps
- In comparison to LTE, LTE Advanced is wider than approximately 70 MHz in DL and 40 MHz in UL.
- LTE - C-plane from Idle (with IP address allocated) to Connected in <100>
- LTE Advanced - C-plane from Idle (with IP address allocated) to Connected in <50>
Peak spectrum efficiency:
- LTE - DL 3 to 4 times Release 6 HSDPA , UL - 2 to 3 times Release 6 Enhanced Uplink
- LTE Advanced - DL 30 bps/Hz and UL 15 bps/Hz.
- LTE - At least 200 users per cell should be supported in the active state for spectrum allocations up to 5 MHz.
- LTE Advanced - At least 300 active users without DRX in a 5 MHz bandwidth.
- LTE - Support mobility across the cellular network for various mobile speeds up to 350km/h (or perhaps even up to 500km/h depending on the frequency band).
- LTE Advanced - Same as that in LTE, System performance shall be enhanced for 0 to 10km/h
LTE Advanced would operate in spectrum allocations of different sizes including wider spectrum allocations than those of Release 8 to achieve higher performance and the target peak data rate, e.g. up to 100 MHz.
Friday, August 7, 2009
- 815 - 830 MHz: UL
- 860 - 875 MHz: DL
- 830 - 845 MHz: UL
- 875 - 890 MHz: DL