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2004/03/23 16:36 updates

Next generation EV-DO，ｍａｉｎ pointｓ are "Broadcasting mode" and "Wireless LAN. "

CdmaOne, 1x, 1X EV-DO, KDDI has enhanced network up to now while maintaining interchangeability. According to Director Fumio Watanabe of au wireless access Engineering Department,au is enhancing EV-DO, the main pointｓ　ａｒｅ "Broadcasting mode" and "Wireless LAN".
   After introducing"cdma One",The network of au has evolved　ｔｏ "CDMA2000 1x"in April, 2002，ａｎｄ "CDMA2000 1X  EV-DO". in November, 2003.  

  KDDI has started the following enhanｍｅｎｔ　ｓｉｎｃｅ　the development of EV-DO　ｈａｓ　ａｃｈｉｅｖｅｄ　to some degree. It is an idea to create new market ｆｒｏｍ communications service ｍａｉｎ ｔｏ the video telephone　ｆｏｒ surveillance and IP ｔｅｌｅｐｈｏｎｅ ｓｙｓｔｅｍ ａｓ business solution ,and the broadcast and the broadcasting service etc.

"Speed-up of up-link", "Wireless QoS and QoS of end-to-end function", "Broadcast and broadcasting wireless function", and "Further speed-up of the IP transmission. ", etc. to be enumerated as points to be reinforced. "Broadcasting mode (Broadcast/Multicast service)" and "Wireless LAN" are the points of future enhancement.

  As for contents like the EZ channel delivered to a terminal now individual, if it is the same contents, the broadcasting mode ｗｉｌｌ　ｂｅ　ｕｓｅｄ.

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2004/02/13 Update at 23:36:00

"This year's ｍａｉｎ　ｐｏｉｎｔ　 is a multicast" EV-DO that evolves -. (1/2)

2.4Mbps or less with fixed charge system──｡　ＫＤＤＩ’ｓ　reformative 1X WIN service was achieved by the communication method named CDMA2000 1x EV-DO. In addition, the EV-DO starts evolving this year. "Multicast" "QoS" and further speed-up …….

Qualcomm Japan commented on the evolution of EV-DO .
KDDI started last December "1X WIN", fixed charge packet transmission service . The communication method is called "CDMA 1x EV-DO". It is a communication method with high flexibility， ｓｏ the fixed charge system is enabled though it is a speed of 2.4Mbps or less．Ｉt specializes in the packet transmission of the Internet type.

  The EV-DO introduction completes the first stage by starting 1X WIN. However, technological EV-DO evolution ｗｉｌｌ not stop. The director　ｆｏｒ　business development， Osamu Maeｄａ who takes charge of EV-DO in Qualcomm Japan ｓａｉｄ "This year's ｍａｉｎ　ｐｏｉｎｔ　 is a multicast".

 EV-DO ｍｕｌｔｉｃａｓｔ　ｉｓ　ｓｏｍｅｔｉｍｅｓ　ｒｅｆｅｒｒｅｄ　ｔｏ　ａｓ　broadcasting． EV-DO multicast ｉｓ to transmit the same data to two or more users from the base station in the same area .

  The maximum advantage is that the width of the frequency used can be extremely little. The volume of information that can be sent by the communication is decided ｂｙ the width of the frequency and S/N (strength of the signal to the noise). When the communication of ｏｎｅ ｔｏ ｏｎｅ is　ｔｈｅ ｂａｓｉｃ　ｓｙｓｔｅｍ　ｏｆ　ｔｈｅ　ｃellular phone , the frequency and time are divided by the ｎｕｍｂｅｒ　ｏｆ　userｓ, 　and transmitted ｂｙ　mixing a signａｌ different in each user. Because resource of frequency was shared by number of users

 Ｉf this is a multicast，ｔhe width of the frequency doesn't change ｅｖｅｎ　ｉｆ　ｓｏ　ｍａｎｙ　ｕｓｅｒｓ　ｕｓｅ　ｉｔ．　It is like broadcasting the television and the radio .

  What becomes possible by introducing this technology?　Ｍｏｔｉｏｎ　ｐｉｃｔｕｒｅｓ ｔｒａｎｓｍｉｔｔｉｏｎ　ｆｏｍ　 base station ｔｏ　ｍｏｂｉｌｅ　ｔｅｒｍｉｎａｌ　ｊｕｓｔ　like Television Broadcasting.