What is EVDO and EVDV ?
Sunday, August 28th, 2011 |
Introduction to EVDO,
EV-DO, 1xEvDO and 1xEV-DO, is a standard for high speed wireless broadband. The acronym is short for “Evolution, Data Only” or “Evolution, Data Optimized”. It is one of two major Third Generation, or 3G, wireless standards. The competing standard is known as W-CDMA. EVDO is an advanced CDMA technology developed by Qualcomm to deal with this limitation. EVDO uses the same approach used for the internet. IP, the Internet Protocol, breaks data into small pieces called packets. Each packet is sent independently of all the other packets. This saves bandwidth for use by other devices; when neither party on a phone call is speaking, the connection consumes no bandwidth because there are no packets to send. or, when an internet web site is accessed, no bandwidth is used until the site starts sending the web page.EVDO has a theoretical throughput of 2.4 megabits per second. A significant advantage of EVDO over competing technologies is that it uses the same broadcasting frequencies as existing CDMA networks.
I) EVDO, also known as CDMA2000, is CDMA’s answer to the need for speed with a downstream rate of about 2 megabits per second, though some reports suggest real world speeds are closer to 300-700 kilobits per second (Kbps). This is comparable to basic DSL. As of fall 2005, EVDO is in the process of being deployed. It is not available everywhere and requires a phone that is CDMA2000 ready.
II) GSM’s answer is EDGE (Enhanced Data Rates for GSM Evolution), which boasts data rates of up to 384 Kbps with real world speeds reported closer to 70-140 Kbps. With added technologies like UMTS (Universal Mobile Telephone Standard) and HSDPA (High Speed Downlink Packet Access), speeds reportedly increase to about 275–380 Kbps. This technology is also known as W-CDMA, but is incompatible with CDMA networks. An EDGE-ready phone is required.
III) In the case of EVDO, theoretical high traffic can degrade speed and performance, while the EDGE network is more susceptible to interference. Both require being within close range of a cell to get the best speeds, while performance decreases with distance. 1xEV-DO is an enabling technology for wireless Internet services. The following are the key aspects of the standard:
- Supporting data rates of up to 2.4 Mbps
- Having no backward-compatibility with CDMA 2000
- Including two inter-operable modes: an integrated 1x mode optimized for voice and medium data speeds, and a 1xEV mode optimized for non real-time high capacity/high speed data and Internet access
- Providing Adaptive Rate Operation with respect to channel conditions
- Providing Adaptive modulation and coding
- Providing Macro diversity via radio selection
- Providing an always-on operation of 1xEV-DO terminals in the active state
- Using a multi-level modulation format (QPSK, 8-PSK, 16-QAM)
1x EV-DV:
1xEV-DV is a CDMA-based 3G standard for the Air Interface. 1xEV-DV is the second phase of evolution of CDMA 2000 and offers complete backward compatibility with CDMA 2000. 1xEV-DV is also compatible with the ANSI-41 core network standards.
EVDO Booster Antenna
If you are in the fringe area of EVDO and coverage is spotty, or you are in a weaker signal area, consider an EVDO external booster antenna. This antenna plugs into the PC 5220 Card / Novatel V620 / KPC650 / Sierra AirCard 580 Card and improves performance dramatically. It will increase your signal strength which will give you a much faster throughput. The external antenna is about twice the size of the PC Card. Do not get a Booster Antenna that clips on to the current antenna – get one that plugs directly into the external antenna port that is built-into the EVDO cards. When you plug in an external antenna through the antenna port, the built-in antenna is disabled and you only use the external and get much better performance.
List of Abbreviations:
1xEV-DO 1x Evolution of Data Only
1xEV-DV 1x Evolution of Data and Voice
3GPP Third Generation Partnership Project
AAA Authentication,Authorisation, and Accounting
AN-AAA Access Network – AAA
ARQ Automatic Repeat Request
ATM Asynchronous Transfer Mode
BLOB Block of Bits
BPSK Binary Phase Shift Keying
BRAN Broadband Radio Access Networks
BS Base Station
CLI Command Line Interface
CRC Cyclic Redundancy Code
DSP Digital Signal Processor
DTX Discontinuous Transmission
DSSS Direct Sequence Spread Spectrum
EDGE Enhanced Data rate for global Evolution
EIB Erasure Indicator Bits
FA Foreign Agent
F-CCCH Forward Common Control Channel
FPGA Field Programmable Gate Array
HA Home Agent
HSDPA High Speed Downlink Packet Access
LAC Link Access Protocol
LTU Logical Transmission Unit
MAC Medium Access Control
MAC-I Message Authentication Code for Integrity
MCSB Message Control and Status Block
OFDM Orthogonal Frequency Division Multiplexing
PCF Packet control Function
PCI Peripheral Component Interconnect
PDCCH Packet Data Control Channel
PDCH Packet Data Channel
PDCHCF Packet Data Channel Control Function
PDSN Packet Data Serving Node
PDU Protocol Data Unit
PN Pseudo Noise
QIB Quality Indicator Bits
Q-PCH Quick Paging Channel
QPSK Quadrature Phase Shift keying
RLP Radio Link Protocol
RSVP Resource Reservation Protocol
SDU Service Data Unit
SO Service Option
SPID Sub Packet Identifier
SSD Shared Secret Data
UMTS Universal Mobile Telecommunications System
W-CDMA Wide Code Division Multiple Access
WLAN Wireless Local Area Network
