公开(公告)号：DE69939407D1

公开(公告)日：2008-10-09

申请号：DE69939407

申请日：1999-03-11

Applicant: IBM

Inventor： HONDA RYOHJI ,  KITAYAMA FUMIHIKO ,  KUSE KAZUSHI

IPC: G08G1/09 ,  G08G1/13 ,  H04B7/26 ,  H04W84/02

Abstract: Information transmitted from an information origin is transferred from one mobile station to another. At this time, in the mobile station, the transmission of the information is controlled so that the information is not transmitted to a distance more than a predetermined value from the position of the information origin. A valid period of the information is defined and only the information within the valid period is transmitted. Alternatively, controls are carried out in order to avoid overlapping of the transfer paths and detours of them. Particularly, if a density of the mobile stations becomes high, the quantity of the information to be transferred increases tremendously. Therefore, it is necessary to select and limit the information to be transferred. If the mobile station is a portable information terminal and a personal user has this portable information terminal, the information origin is a retail store and transmits special sale information and the like as well as position information. The user holding the portable information terminal may go to the special sale store after seeing the special sale information, and if he feels no interest in it, he leaves the special sale store. When the user is walking on the street after leaving the store, the portable information terminal held by the user who was in the store exchanges information with an information portable terminal of the other users. While repeating the exchange of the information, the information reaches to a person who has an interest in the special sale information.