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■ freelance writer Chen Kai

the Japanese government has not yet released to mobile operators for LTE spectrum, is estimated to be released this year, the frequency may be used for LTE is 800MHz. Japan's three mobile operators, NTT, KDDI and Softbank may also be introduced in 2010, LTE-based wireless business. Currently, KDDI launched the 3G wireless services based on CDMA2000 technology, and NTT DoCoMo and Softbank Mobile's 3G service is based on WCDMA technology.

from the development of background, in April 2008, Japan started to LTE mobile communication system,Balenciaga handbag 084857, research to determine the next period of time LTE will coexist with the existing network. Four mobile operators decide to introduce in the next few years, LTE. NTT decided to introduce in 2010 the first LTE.

NTT DoCoMo: LTE early stage of development with the existing 3G networks overlap

1, LTE plans

Japan's NTT DoCoMo to promote LTE is the most active operators . In 2006, NTT began to deploy LTE system; in July 2007, NTT's work in LTE trials mainly on indoor; February 2008, it will focus on field trials. NTT began commercial deployment time for the end of 2009,Chanel bag Classic 35865, this year will achieve full deployment, will also introduce the corresponding LTE mobile terminals.

NTT test venues in three cities in the main, mainly to confirm the LTE in the actual function of a variety of environments. Experimental verification of the LTE's performance and stability. In Sapporo and Hokkaido, starting from the October 2008 trial, including single base station and two sectors, urban environment. In Yokosuka and Kanagawa, starting from February 2008 to test pairs of base stations and the two sectors and the situation of the rural environment. In Yamanashi, starting from August 2008 to test pairs of base stations and six departments and the city surrounding environment.

2009,Balenciaga handbag 084441, NTTDoCoMo and Sapporo in Hokkaido Fujitsu outdoor empirical experiments carried out LTE. Experiments show that the frequency in the 10MHz bandwidth, the maximum speed of 120Mbps can be high-speed downlink transmission. The experimental results will be used in Fujitsu's wireless base station equipment, core network systems and terminal devices end LTE commercial systems.

in the early LTE development, it will overlap with the existing 3G networks; 3G and LTE dual-mode mobile phone coexistence; focus on the PS business, CS business is also available online at 3G; re-use is BS base station with low-cost deployment. LET terminal according to widespread, LTE coverage will expand,Chanel bag Classic 239, CS operations may also be provided in the LTE.

LTE launch, will use the 2GHz frequency and use the existing NW facilities. This development may increase the frequency, but still LTE terminal according to the development and allocation of new frequency bands to be.

2, LTE providers

2008, the Ericsson selected by NTT LTE base station development for the partners. Prior to that, Ericsson and NTT DoCoMo R & D and standardization in the areas of cooperation have been carried out for many years. Since 1992, Ericsson has been provided in the PDC base stations to NTT for OMATM WCDMA network base stations.

mobile phones and infrastructure, NTT select partners are NEC, Fujitsu, Ericsson, Panasonic and NSN. NTT DoCoMo said the LTE service beginning in 2010, Fujitsu, Nokia Siemens has become the NTT's LTE equipment provider.

KDDI: CDMA2000 network to the LTE upgrade from

1, LTE plans

KDDI in CDMA2000, there are many successful experiences, but UMA is dead, so decided to LTE evolution. KDDI and Softbank, NTT, after the decision to adopt LTE. KDDI has decided to abandon its operations CDMA2000, select LTE as their next-generation mobile broadband technology.

KDDI plans to use the LTE technology with 100Mbps of data download capacity is seen as the evolution from 3G to 4G mainstream, its data transmission rate can be comparable with optical fiber communication. KDDI is not possible to present the 2GHz frequency for 3G LTE, because not enough. Therefore, for LTE frequency will be 1.5GHz.

LTE deployment and installation will be carried out in 2012, the network will help reduce the cost of KDDI, CDMA 2000 network, but will exist (at least co-exist 10 years), to ensure that the existing 3G CDMA network to interoperate seamlessly. LTE network deployment, the key is to let the user through the introduction of value-added ecommunications solutions,Louis Vuitton wallet M62630, providing reliable, convenient, differentiated services and user satisfaction.

KDDI plans starting from March 2009 to deploy the joint Nor and Hitachi equipment,Chanel bag Classic 35950, and the end of 2009 choose LTE base station equipment providers, completed by the end of 2010 LTE core and access networks deployment, but the 2010 has not yet decided whether to provide LTE service. KDDI is currently under way from the CDMA2000 network upgrade to LTE.

2, LTE providers

KDDI is Japan's second largest mobile operator, will use Nor and Hitachi to provide the core networking solutions, building its own LTE network.

KDDI selected the cooperation of Hitachi and Nor to deploy its next-generation network, the main value of their technology leadership, as well as to provide a variety of differentiated solutions,Balenciaga handbag 328A, experience and professional standards. Nor LTE in the industry edge in terms of early test with a high level and high-speed mobility, Nor also provides open standards. Nor has years of cooperation with KDDI will continue to provide high-quality,Gucci bag Classic 211982-9674, high performance products and solutions. In addition,Gucci bag Classic 137577, Nor has also been shown in early testing LTE technology leader in power applications.

3, provides business

new LTE network will cover the existing CDMA mobile network, real-time access to the high bandwidth requirements of multimedia content and applications to meet the KDDI's 30 million residents and business mobile users. The establishment of LTE network, the user experience will be greatly improved, including music and video download business, time, anywhere access with high bandwidth demands of image, real-time mobile gaming, and online services, etc..

Softbank: improving wireless broadband communications technology LTE commercial

1, LTE plans

2008 ., Softbank Mobile 1.5GHz frequency band operation on the plans for HSPA +, to market in 2010.

and compared to the other two mobile operators, Softbank have chosen another route. With advanced technology or 3.9G technology called HSPA + compared to select the former Softbank. The reason to make this choice because the direct costs of all aspects of LTE are too high, LTE chips are too expensive at the same time to overcome compatibility problems, but efficiency in the use of frequencies is the same with LTE. Softbank said it does not rule out the future possibility to upgrade to LTE.

2,Louis Vuitton handbag M92880_4946, LTE equipment providers