| Implementation of LTE |
| Seizo Onoe, Toshio Miki, Hiroshi Nakamura |
The award winners started the development of LTE prototype equipment in 2006. In outdoor transmission experiments in February 2008 conducted after indoor experiments, a downlink throughput of 250Mbps was achieved with the prototype equipment. These experiments demonstrated the feasibility, utility and spectrum efficiency of LTE to the world in such an early stage using actual equipment. In the commercial LTE service launched in 2010, downlink indoor speeds of 75Mbps (10MHz bandwidth) and outdoor speeds of 37.5Mbps (5MHz bandwidth) were achieved. In addition, inter-radio access technology handover capability was developed and introduced ahead of most operators in the world.
At the time of starting standardization activities for LTE, Mr. Seizo Onoe advocated Super3G as a concept necessary for ensuring smooth migration to the 4th generation mobile communication. Mr. Onoe led the start of study on LTE as a lot of major vendors and operators around the world agreed to the concept. In standardization and practical implementation of LTE, he has concentrated his effort on achieving efficient use of radio resources to accommodate rapidly growing traffic. Making good use of his experience gained in his consistent work in mobile communication R&D, he has accomplished a 3 times increase in spectrum efficiency and a 3/4 reduction in transmission latency compared to the existing W-CDMA/HSPA systems. In addition to R&D, Mr. Onoe also exercised leadership in standardization of radio systems and practical implementation of base station equipment. He has made remarkable contributions to the development of entire LTE system specifications and management of the whole standardization work for LTE.
Mr. Toshio Miki has exerted effort and leadership in practical implementation of terminals. Among other things, he made significant contributions to the development of LTE-capable terminal platforms to achieve high-speed, high-capacity, and low-latency LTE communication. He has drawn up wireless platform development plans aimed at global deployment and promoted joint development with domestic vendors to realize platforms that are based on global standards and are capable of handovers with existing systems. In LTE-capable terminal development, Mr. Miki promoted and directed a wide range of development and practical implementation work from test environment establishment to collaboration and joint testing with terminal vendors and communication platform developers in addition to the wireless platform development mentioned above.
Mr. Hiroshi Nakamura has been engaged in the development of LTE/SAE standards, which integrate voices and packets in a packet core, and has proposed technical specifications toward standardization, as well as the development and practical implementation of core network equipment for mobile communications. In commercial system development, Mr. Nakamura conducted a review of functional allocation between radio equipment and core network equipment. His achievements include the design of communication control systems with radio systems and the development of their system specifications, as well as the design of inter-radio access technology mobility control systems enabling service provision in 3G areas and call management systems assuming always-on connectivity and the development of their system specifications. He also supervised and directed the work to develop and practically implement equipments such as LTE core networks and operation equipment.
As described above, the award winners have made remarkable contributions to LTE from its conceptual proposal to commercial service launch. The award winners have achieved highly significant achievements and thus are deserving of the achievement award.
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| [1] | M.Kitagawa et al.: ”LTE System and Service as Social Platform for Enriching People’s Lives”, NTT DOCOMO Technical Journal, Vol13, No1, pp4-9 |
| [2] | N.Okubo et al.: ”Overview of LTE Radio Interface and Radio Network Architecture for High Speed, High Capacity and Low Latency” , NTT DOCOMO Technical Journal, Vol13, No1, pp10-19 |
| [3] | K.Suzuki et al.: ”Core Network (EPC) for LTE” , NTT DOCOMO Technical Journal, Vol13, No1, pp26-32 |
| [4] | T.Nakamori et al.: ”LTE Mobile Terminal Platform for Expansion into Global Markets” , NTT DOCOMO Technical Journal, Vol13, No1, pp39-45 |
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Figure1 LTE deployment scenario
