Sony Ericsson Mobile Communications Japan, Inc.

Minoru Yokoshi

Katsutoshi Itoh

Takeshi Itagaki

Osamu Yoshimura

Makoto Natori

Mitsuyoshi Yasuda

A communication system including a communication terminal apparatus and a wireless key apparatus in wireless communication is provided. The communication terminal apparatus includes a first communication unit operable to receive a first wireless signal, and a first control unit operable to determine a distance between the communication terminal apparatus and the wireless key apparatus based on the received first wireless signal, wherein the first control unit limits a predetermined function of the communication terminal apparatus based on determining the distance. The wireless key apparatus includes a second communication unit operable to receive a second wireless signal, and a second control unit operable to determine the distance between the communication terminal apparatus and the wireless key apparatus based on the received second wireless signal, whereby the second control unit decreases transmission power associated with the second communication unit based on the determined distance.

Communication system, communication terminal apparatus and wireless key apparatus

In a case when a wireless communication is carried out between a communication terminal apparatus and a wireless key apparatus in which one of the two apparatuses which carry out the communication becomes a master and the other one becomes a slave, the slave detects a signal from the master and the wireless communication is carried out by a wireless communication system executing the wireless connection between the two apparatuses, it is constituted such that each of the communication terminal apparatus and the wireless key apparatus includes communication means for carrying out the wireless communication, and control means; and in a case when the wireless communication state between the communication terminal apparatus and the wireless key apparatus is a non-connection state, the side which becomes the master is to transmit a signal asking for a 'response from the slave' intermittently by changing the period into a plurality of steps in response to the non-connection time period and the side which becomes the slave is to carry out a reception for searching a signal from the master intermittently by changing the period into a plurality of steps in response to the non-connection time period. It may be expected by this constitution that a communication terminal apparatus such as a mobile telephone terminal can be connected wirelessly with another terminal apparatus rapidly by low power consumption.

Communication system and communication terminal apparatus with changeable transmission/reception periods

A head set apparatus capable of a wireless communication by a predetermined wireless communication system. The wireless communication system includes at least a first communication mode and a second communication mode. The first communication mode enables a data transfer with a partner apparatus and a second communication mode carries out a wireless communication with the partner apparatus with a period shorter than that of the communication in the first communication mode while the wireless connected state remains. The head set apparatus includes a communication section for carrying out a wireless communication by the predetermined wireless communication system and a control section for making the head set function as a head set when the communication state in the communication means is in the first communication mode and for making the head set function as a wireless key for security when the communication state is in the second communication mode.

Head set apparatus, communication terminal apparatus and communication system

A communication terminal apparatus and a wireless key apparatus including judgment means for judging or presuming the wireless communication state or the wireless communication distance in a communication circuit. The communication terminal apparatus and the wireless key apparatus are wireless-connected, and in a case when a communication state for carrying out a wireless communication intermittently is set in each communication circuit and there is judgment or presumption of a predetermined state in the judgment means in a state in which the wireless connection is maintained, the mode setting relating to the function limitation or the notification mode setting relating to the function limitation is to be changed.

Communication system and communication terminal apparatus

A communication system that includes a communication terminal apparatus and a wireless key apparatus and in which wireless communication is possible. A first communication mode attempts a wireless connection in a first period in order to carry out a wireless communication between the communication terminal apparatus and the wireless key apparatus and a second communication mode carries out a wireless communication between the communication terminal apparatus and the wireless key apparatus in a second period longer than that of the connection mode of the wireless connected state.

Communication system, communication terminal apparatus, wireless key apparatus and program

It was constituted such that in a case when a function of the communication terminal apparatusis limited in response to a wireless communication state between the communication terminal apparatusand the wireless key apparatus, it is controlled in the wireless key apparatussuch that a communication connection with the communication terminal apparatusis to be carried out; the function of the terminal apparatusis to limited in the communication terminal apparatusin a case when a predetermined communication state cannot be maintained with respect to the wireless key apparatusand at the same time; and in a case when it is detected that the terminal apparatusexists in a predetermined region such as in the vicinity of the apparatusor the like, the function of the terminal apparatusis not to be limited regardless of the communication state with respect to the wireless key apparatus. In this manner, low power consumption can be attempted in a case when a security process of a communication terminal apparatus such as a mobile telephone terminal is carried out by a wireless communication.

A portable terminal monitors a signal level of a short-range wireless signal from a wireless communication apparatus. If the signal level drops so low that a state of connection for short-range wireless communications cannot be maintained between the two apparatuses, use of predetermined functions of the portable terminal is limited. A short-range wireless communication facility of the portable terminal and the wireless communication apparatus move into a particular operation mode if communications do not occur therebetween at least for a predetermined time period. In monitoring the signal level of the wireless signal from the wireless communication apparatus in the particular operation mode, the portable terminal reduces a response speed at which to detect a signal level change. This causes the wireless communication apparatus to delay issuing a request for an increase in transmission power, thereby reducing unevenness of the working distance at which to alert a user to the unusual distance traveled between the two apparatuses or beyond which to limit the use of some functions of the portable terminal.

Short range wireless communication system, portable terminal apparatus, and wireless communication apparatus

According to the present invention makes, even if two of mobile communication terminal apparatuses such as a wireless key apparatus and a mobile telephone terminal apparatus or the like are utilized in various possessing states, it is made possible to maintain a stable distance detection accuracy. In a communication apparatus in which A distance to a connection partner terminal is detected according to a certain parameter and in a case when the distance exceeds a predetermined value, a function limitation or notification to a user is carried out, it is identified that the two of the mobile communication terminals lie in a predetermined appropriate distance according to a manual or automatic method and the proper distance identification information and further receiving state and transmission power at that time if they are necessary are communicated mutually and a parameter used for a distance detection is adjusted.

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Tokyo, Japan

Minoru Yokoshi