Conventionally, as disclosed in, for example, Japanese Patent Laid-Open No. 2006-287321 (JP '321) and Japanese Patent Laid-Open No. 2011-087026 (JP '026), a vehicular communication system that establishes a narrow area communication channel, such as a Bluetooth communication channel (Bluetooth: a registered trademark), to a cellular phone that is brought into the vehicle compartment is known.
Further, as disclosed in Japanese Patent Laid-Open No. 2003-309865 (JP '865) a wireless communication apparatus establishing a wide area communication channel to a wireless communication access point, or a so-called hot spot, at places such as a coffeehouse, a convenience store, a dealer, which are outside of a vehicle, is also known.
The communication standards for establishing a wide area communication channel, such as IEEE802.11b, IEEE802.11g, and IEEE802.11n, use a communication band of 2.4 GHz, which is also used for establishing a Bluetooth communication channel. Therefore, simultaneous use of two types of communication, that is, the wide area communication channel according to IEEE802.11b, IEEE802.11g, or IEEE802.11n and the narrow area communication channel by the Bluetooth standard, may require a work-out scheme, such as a separate/distant positioning of respective communication antennas, a time division communication control or the like.
However, such work-out scheme may lead to a deteriorated throughput of the wide area communication channel, due to the communication operation of the narrow area communication channel. More specifically, the wide area communication channel assumes a large amount of data communication to and from the access point, thereby making it necessary and urging for the communication apparatus, which is capable of establishing both of narrow and wide area communication channels, to prevent the throughput deterioration of the wide area communication channel caused by the communication operation of the narrow area communication channel.