| Overview |
|
Frequency Bands |
Frequency Range |
|
Band Class 0 |
824.0 – 849.0 MHz
(uplink)
869.0 – 893.0 MHz (downlink) |
|
Band Class 1 |
1850.0 – 1910.0 MHz (uplink)
1930.0 – 1990.0 MHz (downlink) |
|
Band Class 2 |
872.0 – 915.0 MHz (uplink)
917.0 – 960.0 MHz (downlink) |
|
Band Class 3 |
887.0 – 925.0 MHz (uplink)
832.0 – 870.0 MHz (downlink) |
|
Band Class 4 |
1750.0 – 1780.0 MHz (uplink)
1840.0 – 1870.0 MHz (downlink) |
|
Band Class 5 |
411.0 – 483.0 MHz (uplink)
421.0 – 494.0 MHz (downlink) |
|
Band Class 6 |
1920.0 – 1980.0 MHz (uplink)
2110.0 – 2170.0 MHz (downlink) |
|
Band Class 7 |
776.0 – 794.0 MHz (uplink)
746.0 – 764.0 MHz (downlink) |
|
Band Class 8 |
1710.0 – 1785.0 MHz (uplink)
1805.0 – 1880.0 MHz (downlink) |
|
Band Class 9 |
880.0 – 915.0 MHz (uplink)
925.0 – 960.0 MHz (downlink) |
|
Band Class 10 |
806.0 – 901.0 MHz (uplink)
851.0 – 940.0 MHz (downlink) |
|
Channel spacing |
30 kHz |
|
Channel bandwidth |
1.2288 MHz |
|
Modulation |
QPSK, 8-PSK, 16-QAM (forward
link)
OQPSK, HPSK, 8-PSK (reverse link) |
|
Chip rate |
1.2288
Mcps |
|
Access format |
CDMA |
|
Data rates |
38.4
– 2457.6 kbps ( forward link, Rev. 0)
9.6 – 153.6 kbps (reverse link, Rev. 0)
4.8 – 3072 kbps ( forward link, Rev. A)
4.8 – 1843.2 kbps (reverse link, Rev. A) |
Applications
1xEV-DO is the utilisation of an IP-based network to provide a high speed medium
for a host of various data services such as anytime anywhere Internet access,
streaming audio & video services, Voice over IP (VoIP), VPN corporate intranet
access. In addition to these applications for mobile users, this technology
may be utilised for fixed location users who may not have access to wired connectivity.
Technology in brief
1xEV-DO is a derivative of the TIA/EIA IS-95 CDMA standard optimised for high
capacity, high speed data and Internet access. 1xEV-DO technology (also previously
known as High Data Rate “HDR”) was developed by Qualcomm and Lucent.
In March 2000, a working group was formed by the 3GPP2 organisation, which gave
the technology the name 1xEV-DO standing for “Evolution – Data Optimized”.
The 1xEV-DO Rev. 0 standard was adopted in August of 2001 as IS-856. The Rev A standard is IS-856-A.
The standard is based on the premise that voice and data have very different
requirements and there will be inefficiencies anytime the two services are combined.
This requires a separate CDMA carrier. This carrier is fully compatible with
the IS-95/1x carrier from an RF standpoint. This allows the current 1x link
budgets, network plans and RF designs of both access terminals and infrastructure
equipment to be utilised.
1xEV-DO uses a powerful adaptive-rate scheme that allows the Base Station Controller
“BSC” to rapidly (once every few milliseconds) adapt its data rate
for each active user. To achieve this, all active terminals constantly measure
their channel condition based on pilot signals being received from all surrounding
base stations and report back to the radio network the maximum data rate at
which they can receive. This allows the BSC to serve each user at the highest
data rate their channel condition would permit. Depending on the data rate,
which ranges anywhere from 38.4 kbit/s to 2.45 Mbit/s, the 1xEV-DO base station
also selects a suitable modulation format (QPSK, 8-PSK, 16-QAM). The reverse
link utilised is the same as the 1x standard with improvements to adaptive rate
capabilities.
In March 2004, revision A of the standard was released to increase the downlink
data rate to 3.1 Mbit/s, uplink data rates to 1.8 Mbit/s and to introduce enhanced
QoS (Quality of Service) mechanisms. These will support the prioritisation of
individual packets and a dramatic reduction in latency, thus paving the way
toward full multimedia capabilities, including VoIP and video telephony, on
an all-IP radio access and core network.
Typical measurements
Transmitter Measurements:
- Maximum Output Power
- Minimum Output Power
- Frequency Error
- Transmit Modulation Quality
Receiver Measurements:
- Reference Sensitivity Level (based on PER)
- Maximum Input Level (based on PER)
Willtek Test Instruments
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