rate of up to 14 Mbits/s. The universal mobile telecommunications system This paper overviews the universal mobile telecommu-(UMTS) long term evolution (LTE) system, also known as nications system long term evolution (LTE) and discusses the 3.9G, is currently under standardization aiming at the smooth requirements for device technologies pertaining to mobile migration towards the next generation. A peak data rate over terminals. The LTE represents the next generation cellular 100 Mbits/s for the DL and 50 Mbits/s for the uplink (UL) phone technology that is intended to achieve a high peak with low latency are the key requirements for this system. data rate, low latency, and high radio efficiency in addition to This system is summarized in the following sections. low cost and sufficiently high mobility characteristics. Vigorous discussion regarding the specifications for LTE is curTable
Togo 112-8S51, Japan .Ah.wrrcr-A multi-hop wirclcss network connects ti pair of terminals by U path consisting of other teiminals and wireless links; humcvel; if terminsls are randomly discributed, every pair of trrminals is not alwny conscctcd. Then, introducing special facilities called re1a.v facilities to o multi-hap nehvork has been proposed IO improve conncctivit. The relay facilities are used onl? for relaying terminals. This paper assumes that we h n v~ n es must be allocated s t one u f dcsignated points given in advance. Under this assumption, this paper considem how to select ) I from thc given designnted points to improve canncctivih behvcen terminals.es, and ench of the relay fac
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