Radio network system and radio communication method

Abstract

Provided is a wireless network system in which excellent communications are made possible without adopting a scatternet while suppressing power consumption in mobile terminals. The wireless network system includes a first repeater 4a which is packaged with first and second Bluetooth(R) (BT) modules (1) and (2) for cable communications between the BT modules regardless of master / slave modules, a second repeater 4 packaged with a fourth BT module (4), a radio terminal 3 packaged with a third BT module (3) and a radio terminal 3 packaged with a fifth BT module. The first and third BT modules comprise a first pico-net with the first BT module (1) as a master and a third BT module (3) as a slave, and the second, fourth and fifth modules comprise a second pico-net with the fourth BT module (4) as a master and the second and fifth BT modules (2) and (5) as slaves.

Description

technical field [0001] The present invention relates to a wireless network system and a wireless communication method in the network, in particular to a wireless network system and a wireless communication method suitable for a vehicle intercom mechanism using an ISM (Industrial Science Medical) frequency band for short-distance communication. Background technique [0002] For example, in the miniature film of No. 62-155535, it is disclosed that in order to enable the occupants of the two-wheeled vehicle to communicate, the helmet of the occupant is equipped with a headset consisting of a loudspeaker, a microphone, and a portable wireless terminal. The communication system in which the call is made (intercommunication mechanism). In addition, Japanese Patent Laid-Open No. 2001-148657 discloses that on-vehicle wireless terminals for relaying are installed on both sides of the vehicle. The technology of the above-mentioned vehicle-mounted relay device. Here, Bluetooth (BlueT...

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Problems solved by technology

[0016] However, in the above-mentioned network configuration, for example, if the relay device 4a of vehicle A is used as a master device, the relay device 4b of vehicle B becomes a slave device, and one of the portable wireless terminals 3bd and 3bp of vehicle B becomes a master device. , so it is difficult to suppress its power consumption

[0017] In addition, if a distributed network is constructed by the above-mentioned three micro-networks, even if each terminal 3, 4 can act as either a main machine or a slave machine, since the structure of the distributed network has not yet been determined, it will take time to realize it.

Furthermore, even if it is possible to construct a distributed network, it is a big limitation for the SCO (Synchronous Connection Oriented) connection for voice communication, since only a maximum of 3 connections can be established in one Bluetooth module.

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