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Overview of Fundamental TechnologiesWhy CDMA2000 at 450 MHz is such an attractive Proposition
Coverage & Scalability Driven by Frequency Band - 450 MHz
1x&DO BTS
1x&DO BTS
Normalized Cell Count • 450 MHz = 1 • 850 MHz = 3 • 1900 MHz = 13 • 2100 MHz = 16
1x&DO BTS
1x&DO BTS
1x&DO BTS
850 MHz =29 km (2,642 km2)
1x&DO BTS
450 MHz = 49 km (7,543 km2) &DO
1x&DO BTS 1x&DO BTS
1x&DO BTS
1x&DO BTS
1x&DO BTS
1x&DO BTS
Sources: www.cdg.org,
2 | CDMA & 450| March 2011
All Rights Reserved © Alcatel-Lucent 2006, #####
1x&DO BTS
1x&DO BTS
&DO
1x&DO BTS
1x&DO BTS
Capacity in 450 MHz Spectrum - Today
450
EMEA CALA China
UL / DL
450 460 478 488
- 467 - 467 - 486 - 496
Initial Analog (TACS, AMPS etc.) • Were cumbersome • Incompatible between counties • Spectrally inefficient • Lacked any high speed data capabilities • Limited to 5 MHz
4.5 MHz
NMT phone with a keyboard / display unit
In 5MHz CDMA can support 234 Erlangs per site or 7,800 users
21 Analog Control Channels (2.63 kHz)
338 Analog Voice Channels (4.225 MHz) (Legacy NMT Analog Voice)
NMT (7/21 Reuse) could support approx 10.8 Erlangs per site or 360 users
(NMT MoU Digital Interest Group 06/03)
MC EV-DO
1X = 26E Voice
1.25MHz
Guard Band
Guard Band
1x&DO BTS
&DO
21 Analog 85 Analog 1X or EV-DO Control Voice Channels Channels (2.63 kHz) (1 MHz) 1.25MHz
185 Analog 1X or EV-DO Voice Channels (2.3 MHz) 1.25MHz
1X or EV-DO
1.25MHz
DO = 3.1 /1.8 Mbps
1.25MHz
Sources: www.cdg.org,
3 | CDMA & 450| March 2011
All Rights Reserved © Alcatel-Lucent 2006, #####
Capacity in 450 MHz Spectrum - Voice Tomorrow
Up to 4x 1X Capacity
DO = 3.1 /1.8 Mbps
1.25MHz
1X = 26E Voice
1.25MHz
1X Advanced Capacity/Coverage Improvements • Improves call quality and reduce call drop rate for those calls that are RL limited • Reduces required transmit power of the existing and new mobiles • Reduces cell