Hitachi, Ltd.

Noriyuki Sugiura

Yasuhiko Sasaki

Masashi Yano

Hideya Suzuki

Arata Nakagoshi

Toru Ishikawa

Masahiro Koya

Kazuhito Ishida

Hideo Munehiro

In order to solve the problem in that information relating to a specific purpose can be saved in the internal memory of a mobile apparatus on which a permanent memory is mounted while information relating to other purpose cannot be saved in the internal memory of the apparatus, the purpose of each telephone call is distinguished by sending a non-telephone type notice before transferring the call and thus the user can determine whether the call should be saved or not.

Highly secured portable telephone system and information system

A radio communication system comprises at least one switching system, at least one first CS (Cell Site) connected to the switching system, at least one second CS which is not connected to the switching system, and a plurality of PSs (Personal Station). The first CS accommodates a plurality of radio channels that can be dynamically established between the PSs and the second CS. The second CS accommodates a plurality of radio channels that can be dynamically established between the PSs, the first CS and other second CS, and has the function of relaying the radio channels.

Radio communication system having a wireless cell site

A radio communication system and a traffic channel assignment method for realizing the assignment of traffic channels capable of improving the efficiency of use of frequency in the case where the traffic density is high and improving a radio link quality in the case where the traffic density is low. A base station judges the traffic density from a carrier to interference power ratio (CIR) on each channel capable of being selected as a traffic channel. In the case where the traffic density is low, a traffic channel assignment mode selecting an available channel having a greater CIR is assigned as a traffic channel to a mobile station. In the case where the traffic density is high, a traffic channel assignment mode selecting an available channel having a smaller CIR is assigned as a traffic channel to the mobile station. Thereby, it is possible to structure a radio communication system which can cope with the condition of the traffic density of the neighborhood.

Traffic channel assignment based on traffic density and signal quality

Growing community of inventors

Yokohama, Japan

Noriyuki Sugiura