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in the position:home>news

date:2013-09-28  view:6198

  in february this year, announced in its cdma2000, zte's first ev-do revision b easy way on commercial systems voip phone, ev-do revision b of this breakthrough instantly aroused widespread concern in the communications industry.

  china telecom business with wcdma and td-scdma technology and cdma20001xev-do technology known as 3g's three criteria. ev cdma20001xev-do standard is "evolution" abbreviation, evolution, do was dataoptimized, said is a cdma2000 ev-do technology network in terms of providing data services as an effective means of enhancing, its evolution line as shown in figure 1.

 this will be the first to introduce the technical advantages of ev-do revision b, then from the user experience, operators upgrade costs, market development potential, and compared with the 4g and explain future ev-do revision b, also analyzed the deployment challenges to version b.

ev-do revision b technical advantages

  cdma20001xev-do technology is in the united states qualcomm hdr (highdatarate) technology development on the basis of the, also known as the high rate packet data hrpd (high rate packet data) technology. cdma2000 ev-do revision b technology is for single carrier ev-do version of a technology for mc extension, thus known as the mc ev-do. in may 2006, 3gpp2 launched ev-do revision b air interface protocol, namely multicarrier ev-do technology.
  compared with version 0 and version a version b's most prominent feature is the introduction of design of multi-carrier, carrier number is 1~15, can support the bandwidth up to 20mhz (15-carrier), which makes it at (accessterminal and terminals) can work on the discontinuous frequency, frequency selectivity in order to achieve diversity, and load-balancing. in addition, version b has good backward compatibility, at the previous version is also available in a new an (access network, access network) to work, network users can continue to use the original cell phone after upgrading, just rate will not increase.

  single carrier can only be obtained on time domain of multiuser diversity, and multicarrier ev-do capable on both time-domain and frequency-domain of multiuser diversity and thus improve spectrum utilization and thus get higher transfer rates, improved link performance up and down. due to using has flexible of duplex carrier configuration technology, version b system support flexible of carrier deployment programme: a for overlap way, that in current ev-do version a, single carrier system of based shang increased carrier; another a for mixed frequency complex with way, that different of carrier using different of frequency complex with coefficient, all uplink uplink carrier of complex with coefficient are for 1, and in qian to chain road carrier complex with coefficient for 1 of based shang, increased frequency complex with coefficient for 2, and 3 of carrier configuration option. hybrid frequency reuse mode makes the ev-do revision b system can use a non-symmetric random bands or, to increase system-band configuration flexibility and diversity.
  due to ev-do revision b terminal work in multi-carrier mode, so to end up with more stringent requirements on power consumption. in view of this, ev-do revision b many improved technology to reduce terminal power problems. main terminal side of the ev-do revision b power optimization technology: fast paging channel (qpch), non-continuous transmission (dtx), non-continuous receiver (drx). the adoption of this technology has been effective in reducing terminal power consumption, thus extending the terminal working hours. its main improvements can be summarized into the following several points:

  • multilinkrlp support (carrier frequency) channel aggregation;
  • improved pilot collection management and adaptive options;
  • symmetric and asymmetric mode;
  • mc uplink mac (token leaky bucket algorithm);
  • adaptive load balancing;
  • optimizing terminal-power technology
  • flexible duplex channel allocation: in order to adapt to the working mode of symmetric and asymmetric.



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